CN112414265B - Engine aperture size measurement compensation calculation method, measurement compensation method and device - Google Patents
Engine aperture size measurement compensation calculation method, measurement compensation method and device Download PDFInfo
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- CN112414265B CN112414265B CN202011152528.2A CN202011152528A CN112414265B CN 112414265 B CN112414265 B CN 112414265B CN 202011152528 A CN202011152528 A CN 202011152528A CN 112414265 B CN112414265 B CN 112414265B
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- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
- G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters
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Abstract
本发明涉及发动机参数测量技术领域，具体涉及一种发动机孔径尺寸测量补偿计算方法、测量补偿方法和装置。本发明首先根据不同温度下标准环规的内径测量值与标准内径测量值的差值，以及内径测量值对应的环规温度与标准温度的差值，计算出环规测量补偿值与对应的温度差值之间的第一对应关系，然后根据待测工件的孔径测量值与标准孔径测量值的差值，以及孔径测量值对应的工件温度与标准温度的差值，计算出孔径测量补偿值与对应的温度差值之间的第二对应关系，之后可以利用第一对应关系和第二对应关系，高效准确地计算出所述待测工件孔径在不考虑温度误差时的测量补偿值，进而得出待测工件孔径在不考虑温度误差时的孔径精确尺寸值。
The invention relates to the technical field of engine parameter measurement, in particular to an engine aperture size measurement compensation calculation method, measurement compensation method and device. The invention first calculates the ring gauge measurement compensation value and the corresponding temperature according to the difference between the inner diameter measurement value of the standard ring gauge and the standard inner diameter measurement value at different temperatures, as well as the difference between the ring gauge temperature and the standard temperature corresponding to the inner diameter measurement value. The first correspondence between the differences, and then according to the difference between the aperture measurement value of the workpiece to be measured and the standard aperture measurement value, and the difference between the workpiece temperature and the standard temperature corresponding to the aperture measurement value, the aperture measurement compensation value and the standard temperature are calculated. The second correspondence between the corresponding temperature differences, and then the first correspondence and the second correspondence can be used to efficiently and accurately calculate the measurement compensation value of the aperture of the workpiece to be measured without considering the temperature error, and then obtain Get the exact size value of the hole diameter of the workpiece to be measured without considering the temperature error.
Description
Technical Field
The invention relates to the technical field of engine parameter measurement, in particular to a method and a device for measuring, compensating and calculating engine aperture size.
Background
In the production and manufacturing process of an engine, the diameters of a crankshaft hole, a cylinder hole and the like are very important detection items, the precision requirement is very high, the size relates to the assembling and grouping matching of a crankshaft tile cover and a piston, the matching and the operation of a crankshaft connecting rod mechanism can be influenced by the slight difference of the diameters of the crankshaft tile cover and the piston, the integral performance of the engine is very important, and the diameter tolerance of the crankshaft hole and the cylinder hole of the engine needs to be controlled within tens of micrometers in a high-precision application scene. Therefore, efficient and accurate measurement means are indispensable.
In the current industry, the common practice is to use a special measuring device to measure the crankshaft hole and the cylinder hole on a production line, the measuring machine is provided with a standard ring gauge and a precise measuring head, and the measuring resolution can reach 0.1 micron. However, the measurement scheme has high requirements on the measurement environment, the temperature of the standard measurement environment is required to be kept at 20 +/-2 ℃, and the measurement is carried out after the standard ring gauge and the workpiece to be measured are stored at the standard measurement temperature for a long time at a constant temperature. Due to the limitation of working conditions, many production workshops are not in a standard constant temperature environment of 20 ℃, the measured workpiece and the standard ring gauge are expanded with heat and contracted with cold due to seasonal changes and day-night temperature differences, and the accuracy of measuring dimensions cannot be guaranteed. And under the conditions of high temperature and severe cold, the measured size often has out-of-tolerance, which causes the measured workpiece to be judged unqualified and the production line to stop.
Therefore, how to measure the precise size of the aperture of the engine efficiently and accurately at a non-standard temperature is a technical problem which needs to be solved at present.
Disclosure of Invention
The invention aims to provide a method for measuring, compensating and calculating the aperture size of an engine, a method and a device for measuring and compensating the aperture size of the engine, so as to measure the measurement compensation value of the aperture of the engine at the current ambient temperature efficiently and accurately, compensate the aperture measurement value of the engine at a non-standard temperature and obtain the accurate size of the aperture.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for calculating compensation of engine aperture size measurement, where the method includes:
acquiring a standard inner diameter measurement value of a standard ring gauge at a standard temperature and a standard aperture measurement value of a workpiece to be measured;
obtaining a plurality of inner diameter measurement values of the standard ring gauge at different ring gauge temperatures;
when the temperature of the ring gauge is at a standard temperature, a plurality of aperture measurement values of the workpiece to be measured at different workpiece temperatures are obtained;
calculating a first corresponding relation between a ring gauge measurement compensation value and a temperature difference value corresponding to the ring gauge measurement compensation value according to the difference value between the plurality of inner diameter measurement values and the standard inner diameter measurement value and the difference value between the ring gauge temperature corresponding to the plurality of inner diameter measurement values and the standard temperature;
calculating a second corresponding relation between the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value according to the difference value between the aperture measurement values and the standard aperture measurement value and the difference value between the workpiece temperature corresponding to the aperture measurement values and the standard temperature;
the first corresponding relation and the second corresponding relation are used together for calculating measurement compensation values of the workpiece to be measured and the standard ring gauge at the current temperature according to the difference value of the current workpiece temperature of the workpiece to be measured and the standard temperature and the difference value of the current ring gauge temperature of the standard ring gauge and the standard temperature, and then obtaining an accurate size value of the workpiece to be measured when temperature errors are not considered.
In one possible embodiment, the difference between the designed inner diameter dimension of the standard ring gauge and the designed bore diameter dimension of the workpiece to be measured is within a set tolerance range.
In one possible embodiment, the obtaining a plurality of inner diameter measurements of the ring gauge at different ring gauge temperatures comprises:
heating the standard ring gauge to a first temperature;
in the process that the standard ring gauge is cooled from the first temperature to the standard temperature, acquiring the inner diameter measurement value of the standard ring gauge at intervals of a first fixed temperature;
cooling the standard ring gauge to a second temperature;
and acquiring the inner diameter measurement value of the standard ring gauge at every second fixed temperature in the process of heating the standard ring gauge from the second temperature to the standard temperature.
In one possible embodiment, the obtaining a plurality of aperture measurements of the workpiece under test at different workpiece temperatures comprises:
heating the workpiece to be measured to a third temperature;
in the process that the workpiece to be measured is cooled from the third temperature to the standard temperature, acquiring the aperture measurement value of the workpiece to be measured at intervals of a third fixed temperature;
cooling the workpiece to be detected to a fourth temperature;
and acquiring the aperture measurement value of the workpiece to be measured once every fourth fixed temperature in the process that the workpiece to be measured is heated from the fourth temperature to the standard temperature.
In a possible embodiment, the calculating a first corresponding relationship between a ring gauge measurement compensation value and a temperature difference value corresponding to the ring gauge measurement compensation value according to the difference value between the plurality of inner diameter measurement values and the standard inner diameter measurement value and the difference value between the ring gauge temperature corresponding to the plurality of inner diameter measurement values and the standard temperature includes:
according to the first compensation value set and the first temperature difference value set, constructing a first relation curve of the temperature difference values corresponding to the ring gauge measurement compensation values and the ring gauge measurement compensation values; wherein the first set of compensation values comprises differences of the number of inside diameter measurements and the standard inside diameter measurement; the first set of temperature difference values comprises the difference values of the standard ring gauge temperature and the standard temperature corresponding to the plurality of inner diameter measurement values;
and fitting a first corresponding relation between the ring gauge measurement compensation value and the temperature difference value corresponding to the ring gauge measurement compensation value by using a least square method according to the first relation curve.
In a possible embodiment, the calculating a second corresponding relationship between the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value according to the difference value between the aperture measurement values and the standard aperture measurement value and the difference value between the workpiece temperature corresponding to the aperture measurement values and the standard temperature comprises:
according to the second compensation value set and the second temperature difference value set, constructing a second relation curve of the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value; wherein the second set of compensation values comprises differences of the number of aperture measurements and the standard aperture measurement; the second set of temperature differences comprises differences between the workpiece temperature and the reference temperature for the number of aperture measurements;
and fitting a second corresponding relation between the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value by using a least square method according to the second relation curve.
In a second aspect, an embodiment of the present invention provides a method for compensating engine aperture size measurement, where the method includes:
acquiring the current workpiece temperature of a workpiece to be measured and the current ring gauge temperature of a standard ring gauge;
acquiring a current aperture measurement value of the workpiece to be measured at the current workpiece temperature;
calculating a first temperature difference between the current ring gauge temperature and the standard temperature;
calculating a second temperature difference between the current workpiece temperature and the standard temperature;
calculating a first current compensation value corresponding to the first temperature difference according to the first corresponding relation calculated in the first aspect;
calculating a second current compensation value corresponding to the second temperature difference according to the second corresponding relation calculated in the first aspect;
calculating the aperture precise size value of the workpiece to be measured at the current workpiece temperature and the current ring gauge temperature; wherein the aperture precise dimension value is a difference between the aperture current measurement value and a current total compensation value; the current total compensation value is a difference value between the second current compensation value and the first current compensation value.
In a third aspect, an embodiment of the present invention provides an engine aperture size measuring apparatus, including:
the current temperature acquisition module is used for acquiring the current workpiece temperature of the workpiece to be measured and the current ring gauge temperature of the standard ring gauge;
the current aperture measurement value acquisition module is used for acquiring the current aperture measurement value of the workpiece to be measured at the current workpiece temperature;
the first calculation module is used for calculating a first temperature difference between the current ring gauge temperature and the standard temperature;
the second calculation module is used for calculating a second temperature difference between the current workpiece temperature and the standard temperature;
a third calculation module, configured to calculate a first current compensation value corresponding to the first temperature difference according to the first corresponding relationship calculated according to claim 1;
a fourth calculating module, configured to calculate a second current compensation value corresponding to the second temperature difference according to the second corresponding relationship calculated according to claim 1;
the fifth calculation module is used for calculating the aperture precise size value of the workpiece to be measured at the current workpiece temperature and the current ring gauge temperature; wherein the aperture precise dimension value is a difference between the aperture current measurement value and a current total compensation value; the current total compensation value is a difference value between the second current compensation value and the first current compensation value.
In a fourth aspect, an embodiment of the present invention provides an engine aperture size measuring apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the engine aperture dimension measurement compensation calculation method described in the second aspect.
In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the steps of the engine aperture size measurement compensation calculation method described in the second aspect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method, firstly, a first corresponding relation between a ring gauge measurement compensation value and a corresponding temperature difference value is calculated according to the difference value between an inner diameter measurement value and a standard inner diameter measurement value under different temperatures and the difference value between ring gauge temperature corresponding to the inner diameter measurement value and standard temperature, then, a second corresponding relation between an aperture measurement compensation value and a corresponding temperature difference value is calculated according to the difference value between the aperture measurement value and a standard aperture measurement value and the difference value between workpiece temperature corresponding to the aperture measurement value and the standard temperature, and then, the measurement compensation value of the aperture of the workpiece to be measured when the temperature error is not considered can be efficiently and accurately calculated by utilizing the first corresponding relation and the second corresponding relation, so that the accurate size value of the aperture of the workpiece to be measured when the temperature error is not considered is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for calculating compensation for engine aperture size measurement according to an embodiment of the present invention;
FIG. 2 is a schematic view of a standard ring gauge provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a pneumatic test head according to the present invention;
FIG. 4 is a flow chart of a method for compensating for engine aperture size measurements provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an engine aperture size measuring device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for calculating a compensation of an engine aperture size measurement according to an embodiment of the present invention, including steps 11 to 15.
And 11, acquiring a standard inner diameter measurement value of the standard ring gauge at a standard temperature and a standard aperture measurement value of the workpiece to be measured.
Specifically, the standard ring gauge is a high-accuracy size measuring tool with the diameter of an inner hole of a middle section perpendicular to an axis at a specified position as a working length, belongs to a precision measuring tool for measuring the size of a workpiece, and can be used as a size reference, can also be used for comparison measurement and can also be directly used for verification. The material of the check ring gauge is T10, and the hardness is HRC58-62 degrees after the processes of heat treatment, carburization and the like. Fig. 2 is a schematic diagram of a standard ring gauge according to an embodiment of the present invention. Preferably, the designed inner diameter size of the standard ring gauge and the designed aperture gauge of the workpiece to be measured should be the same, and the deviation of the measured values of the standard ring gauge and the workpiece to be measured should be guaranteed to be within 0.05mm under the same ambient temperature. For example, the bore diameter of a finely bored cylinder bore is required to be 73(-0.08, -0.05) mm, i.e., between 72.92 and 72.95mm, and the standard ring size selected in this embodiment is 72.9479mm, which is accurate to 0.0001 mm.
Specifically, the value range of the standard temperature is 18 ℃ to 22 ℃, that is, the temperature of the body workpiece of the standard ring gauge is 20 +/-2 ℃. In this embodiment, a contact type thermal resistance sensor is used to measure the surface temperature of the standard ring gauge and the surface temperature of the workpiece to be measured.
Preferably, the difference between the designed inner diameter size of the standard ring gauge and the designed bore size of the workpiece to be measured is within a set tolerance range, wherein the tolerance range is +/-0.05 mm.
And 12, obtaining a plurality of inner diameter measurement values of the standard ring gauge at different ring gauge temperatures.
Specifically, the workpiece temperature of the workpiece to be measured is changed, then the measured value of the inner diameter of the workpiece to be measured at the current workpiece temperature is measured, and the operation of the step can be realized by repeating the steps for many times.
Specifically, the inner diameter measurement value obtained in this step has temperature error interference, and cannot reflect the size value of the workpiece to be measured under the theoretical condition, so that subsequent error compensation is required.
Here, the present invention further provides a better scheme for obtaining a plurality of inner diameter measurement values, which specifically includes:
step 21, heating the standard ring gauge to a first temperature.
Specifically, the standard ring gauge can be heated to any required temperature by using a mode of heating in an incubator or soaking in hot water.
Specifically, the value of the first temperature is preferably a high temperature value in the working temperature of the aperture of the standard ring gauge, and the value range of the first temperature in the step is 35 ℃ to 45 ℃.
And step 22, acquiring the inner diameter measurement value of the standard ring gauge at intervals of a first fixed temperature in the process of cooling the standard ring gauge from the first temperature to the standard temperature.
Specifically, the standard ring gauge can be naturally cooled in a working environment, the surface temperature of the standard ring gauge is detected in real time by a contact type thermal resistance sensor, the pore size is measured once when the temperature is reduced by 2 ℃, and the measured value of the inner diameter is recorded once.
And 23, cooling the standard ring gauge to a second temperature.
Specifically, the standard ring gauge can be cooled to any required temperature by using a refrigeration or ice water soaking mode of a temperature control refrigerator.
Specifically, the value of the second temperature is preferably a low temperature value in the working temperature of the aperture of the standard ring gauge, and the value range of the second temperature in the step is 3 ℃ to 10 ℃.
And 24, acquiring the inner diameter measurement value of the standard ring gauge at intervals of a second fixed temperature in the process of heating the standard ring gauge from the second temperature to the standard temperature.
Specifically, the step can be carried out by placing the workpiece to be measured in a working environment for natural temperature rise, detecting the surface temperature of the workpiece to be measured in real time by using a contact type thermal resistance sensor, measuring the aperture size once every time the temperature rises by 2 ℃, and recording the inner diameter measurement value once.
Finally, the inner diameter measurements recorded in steps 22 and 24 constitute the plurality of inner diameter measurements in step 12. During specific testing, the pneumatic detection head is used for measuring the inner diameter of the standard ring gauge at a standard temperature, then the inner diameter is zeroed, and then the inner diameter of the standard ring gauge at other temperatures is measured according to the nominal size on the standard ring gauge.
And step 13, acquiring a plurality of aperture measurement values of the workpiece to be measured at different workpiece temperatures when the ring gauge temperature is at the standard temperature.
Specifically, the operation of the step can be realized by changing the workpiece temperature of the workpiece to be measured, measuring the aperture measurement value of the workpiece to be measured at the current workpiece temperature, and repeating the operation for multiple times.
Specifically, the aperture measurement value obtained in this step has temperature error interference, and cannot reflect the size value of the workpiece to be measured under the theoretical condition, so that subsequent error compensation is required.
Here, the present invention further provides a better scheme for obtaining a plurality of aperture measurement values at different workpiece temperatures, which specifically includes:
and 31, heating the workpiece to be measured to a third temperature.
Specifically, the workpiece to be measured can be heated to any required temperature by using a constant temperature box heating or hot water soaking mode.
Specifically, the value of the third temperature is preferably a high temperature value in the working temperature of the aperture of the workpiece to be measured, and the value range of the first temperature in the step is 35 ℃ to 45 ℃.
And step 32, acquiring the aperture measurement value of the workpiece to be measured at intervals of a third fixed temperature in the process of cooling the workpiece to be measured from the third temperature to the standard temperature.
Specifically, the step can be implemented by placing the workpiece to be measured in a working environment for natural cooling, detecting the surface temperature of the workpiece to be measured in real time by using a contact type thermal resistance sensor, measuring the aperture size once every time the temperature is reduced by 2 ℃, and recording the aperture measurement value once.
And step 33, cooling the workpiece to be measured to a fourth temperature.
Specifically, the workpiece to be measured can be cooled to any required temperature by using a cold storage mode or an ice water soaking mode of a temperature control refrigerator.
Specifically, the value of the second temperature is preferably a low temperature value in the working temperature of the aperture of the workpiece to be measured, and the value range of the fourth temperature in this step is 3 ℃ to 10 ℃.
And step 34, acquiring the aperture measurement value of the workpiece to be measured at every fourth fixed temperature in the process that the workpiece to be measured is heated from the fourth temperature to the standard temperature.
Specifically, the step can be carried out by placing the workpiece to be measured in a working environment for natural temperature rise, detecting the surface temperature of the workpiece to be measured in real time by using a contact type thermal resistance sensor, measuring the aperture size once every time the temperature rises by 2 ℃, and recording the aperture measurement value once.
Finally, the pore size measurements recorded in steps 32 and 34 constitute the pore size measurements in step 13. Specifically, in this embodiment, a pneumatic detection head is used to measure the aperture size, the pneumatic detection head measures a standard ring gauge with a known diameter and then sets zero, after the pneumatic detection head extends into the aperture, the deviation of the aperture size from the nominal size of the standard ring can be accurately calculated according to the detected data such as the gas flow rate and the gas pressure value, and the calculated aperture size is shown in fig. 3, which is a schematic diagram of the pneumatic detection head provided by the present invention.
And 14, calculating a first corresponding relation between a ring gauge measurement compensation value and a temperature difference value corresponding to the ring gauge measurement compensation value according to the difference value between the plurality of inner diameter measurement values and the standard inner diameter measurement value and the difference value between the ring gauge temperature corresponding to the plurality of inner diameter measurement values and the standard temperature.
Specifically, the calculation process of the first corresponding relationship includes:
and 41, constructing a first relation curve of the temperature difference values corresponding to the ring gauge measurement compensation values and the ring gauge measurement compensation values according to the first compensation value set and the first temperature difference value set.
Wherein the first set of compensation values comprises differences of the number of inside diameter measurements and the standard inside diameter measurement; the first set of temperature difference values comprises the difference values of the standard ring gauge temperature and the standard temperature corresponding to the plurality of inner diameter measurement values.
Specifically, the present embodiment uses a point tracing method to construct the first relation curve.
And step 42, fitting a first corresponding relation between the ring gauge measurement compensation value and the temperature difference value corresponding to the ring gauge measurement compensation value by using a least square method according to the first relation curve.
Specifically, a first corresponding relationship between the ring gauge measurement compensation value and the temperature difference value corresponding to the ring gauge measurement compensation value can be calculated through curve fitting.
And step 15, calculating a second corresponding relation between the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value according to the difference value between the plurality of aperture measurement values and the standard aperture measurement value and the difference value between the workpiece temperature corresponding to the plurality of aperture measurement values and the standard temperature.
Specifically, the calculation process of the second correspondence includes:
and step 51, constructing a second relation curve of the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value according to the second compensation value set and the second temperature difference value set.
Wherein the second set of compensation values comprises differences of the number of aperture measurements and the standard aperture measurement; the second set of temperature differences includes differences between the workpiece temperature and the reference temperature for the number of aperture measurements.
Specifically, the second relation curve is constructed by using a point tracing method in the embodiment.
And step 52, fitting a second corresponding relation between the aperture measurement compensation value and the temperature difference value corresponding to the aperture measurement compensation value by using a least square method according to the second relation curve.
Specifically, a second correspondence between the aperture measurement compensation value and the temperature difference value corresponding to the ring gauge measurement compensation value can be calculated through curve fitting.
The first corresponding relation and the second corresponding relation are used together for calculating measurement compensation values of the workpiece to be measured and the standard ring gauge at the current temperature according to the difference value of the current workpiece temperature of the workpiece to be measured and the standard temperature and the difference value of the current ring gauge temperature of the standard ring gauge and the standard temperature, and then obtaining an accurate size value of the workpiece to be measured when temperature errors are not considered.
The specific calculation scheme comprises the following steps:
and 61, acquiring the current workpiece temperature of the workpiece to be measured and the current ring gauge temperature of the standard ring gauge. The current workpiece temperature and the current ring gauge temperature can be the same or can be independently configured and are different from each other.
And 62, acquiring a current aperture measurement value of the workpiece to be measured at the current workpiece temperature.
Specifically, before measurement, the pneumatic detection head needs to zero the standard ring gauge at the current ring gauge temperature.
And 63, calculating a first temperature difference between the current ring gauge temperature and the standard temperature.
And step 64, calculating a second temperature difference between the current workpiece temperature and the standard temperature.
And step 65, calculating a first current compensation value corresponding to the first temperature difference according to the calculated first corresponding relation.
And step 66, calculating a second current compensation value corresponding to the second temperature difference according to the calculated second corresponding relation.
And 67, calculating the aperture accurate size value of the workpiece to be measured at the current workpiece temperature. Wherein the aperture precise dimension value is a difference between the aperture current measurement value and the current total compensation value. The current total compensation value is a difference value between the second current compensation value and the first current compensation value.
Specifically, the aperture size is measured by adopting the pneumatic detection head, the pneumatic detection head is zeroed by using the standard ring gauge in the process, namely the nominal size on the standard ring gauge is used as a reference value, and then the deviation value of the aperture size relative to the inner diameter of the standard ring gauge is obtained according to a sensing signal when the pneumatic detection head measures the aperture of the workpiece to be measured, so that the aperture size is detected. Therefore, under the same ambient temperature, the influence of the temperature on the standard ring gauge is just opposite to the influence of the temperature on the aperture of the workpiece to be measured, and therefore, the difference value between the second current compensation value and the first current compensation value is required to be used as the current total compensation value to compensate the influence of the ambient temperature on the current measurement together. The scheme of the invention can effectively remove the influence of temperature on the standard ring gauge and the influence of temperature on the aperture of the workpiece to be measured, thereby simply and accurately calculating the accurate size of the aperture.
Based on the same inventive concept as the method, the embodiment of the present invention further provides a method for compensating for the measurement of the aperture size of the engine, and as shown in fig. 4, the method includes:
and step 71, acquiring the current workpiece temperature of the workpiece to be measured and the current ring gauge temperature of the standard ring gauge.
The current workpiece temperature of the workpiece to be measured and the current ring gauge temperature of the standard ring gauge can be the same or independent and different.
Specifically, the current workpiece temperature of the workpiece to be measured and the current ring gauge temperature of the standard ring gauge are obtained according to a detection signal of the contact type thermal resistance sensor.
And 72, acquiring the current aperture measurement value of the workpiece to be measured at the current workpiece temperature.
Specifically, before measurement, the pneumatic detection head needs to zero the standard ring gauge at the current ring gauge temperature.
Specifically, the current measurement value of the aperture of the workpiece to be measured is obtained according to the detection measurement signal of the pneumatic detection head, specifically, the nominal size on the standard ring gauge is used as a reference value, and then the deviation value of the aperture size relative to the inner diameter of the standard ring gauge is obtained according to the sensing signal when the pneumatic detection head measures the aperture of the workpiece to be measured, so that the aperture size is detected.
Step 73, a first temperature difference between the current ring gauge temperature and the standard temperature is calculated.
A second temperature difference between the current workpiece temperature and a standard temperature is calculated, step 74.
And 75, calculating a first current compensation value corresponding to the first temperature difference according to the calculated first corresponding relation.
In particular, the first correspondence may be obtained according to any of the above schemes.
And 76, calculating a second current compensation value corresponding to the second temperature difference according to the calculated second corresponding relation.
Specifically, the second corresponding relationship may be obtained according to any of the above schemes.
And 77, calculating the aperture accurate size value of the workpiece to be measured at the current workpiece temperature.
Wherein the aperture precise size value is a difference between the aperture current measurement value and a current total compensation value, and the current total compensation value is a difference between the second current compensation value and the first current compensation value.
Specifically, the precise size of the aperture refers to the size of the aperture without the influence of temperature.
Specifically, the aperture size is measured by adopting the pneumatic detection head, the pneumatic detection head is zeroed by using the standard ring gauge in the process, namely the nominal size on the standard ring gauge is used as a reference value, and then the deviation value of the aperture size relative to the inner diameter of the standard ring gauge is obtained according to a sensing signal when the pneumatic detection head measures the aperture of the workpiece to be measured, so that the aperture size is detected. Therefore, under the same ambient temperature, the influence of the temperature on the standard ring gauge is just opposite to the influence of the temperature on the aperture of the workpiece to be measured, and therefore, the difference value between the second current compensation value and the first current compensation value is required to be used as the current total compensation value to compensate the influence of the ambient temperature on the current measurement together. The scheme of the invention can effectively remove the influence of temperature on the standard ring gauge and the influence of temperature on the aperture of the workpiece to be measured, thereby simply and accurately calculating the accurate size of the aperture.
In the field, the standard measurement environment requires that the temperature is kept at 20 +/-2 ℃ and the humidity is 45-75%. However, due to the limitations of workshop environment and cost, most workshop environments cannot meet the requirement of constant temperature, the time interval between workpiece processing and workpiece measurement is short on a production line, the temperature of the workpiece can change due to the heat of processing work of a previous procedure, heat exchange of cutting fluid, air blowing, cleaning and other factors, the standard ring gauge is placed in the workshop atmosphere for a long time, the temperature is approximate to the ambient temperature, and the temperature of the standard ring gauge can also change along with seasonal changes and changes in morning and evening time. The hole diameters of the workpiece and the standard ring gauge also vary with temperature.
A feature in the art that distinguishes crankshaft bore diameters and cylinder bore diameters from other bore diameters is the requirement to group diameters to fit differently sized parts. Measurement errors caused by temperature can cause grouping errors, and can further cause wrong type selection of parts for subsequent assembly, thereby influencing the service life of products. For example, the diameter of the crankshaft hole of a certain product of an east wind automobile is required to be 49.000-49.018 mm, the diameter is required to be divided into three ranges of 49.000mm-49.006mm, 49.007 mm-49.012 mm and 49.013mm-49.018mm, and bearing bushes with different sizes are respectively arranged; after the measurement compensation scheme is applied, the qualified crankshaft hole with sufficient accuracy can be obtained, then the applicant can divide the qualified crankshaft hole into three ranges of 49.000mm to 49.006mm, 49.007mm to 49.012mm and 49.013mm to 49.018mm according to the size, if the accurate size value obtained after the temperature error compensation of the crankshaft hole is within 49.000mm to 49.006mm, the bearing bush with the smaller size is correspondingly equipped, and if the accurate size value obtained after the temperature error compensation of the crankshaft hole is within 49.013mm to 49.018mm, the bearing bush with the larger size is correspondingly equipped, so that each crankshaft can be assembled in the crankshaft hole through the bearing bush with the proper size, the accurate matching of the crankshaft and an engine cylinder block is ensured, the field engine assembly efficiency is greatly improved, and a very good application effect is obtained.
Based on the same inventive concept as the method, an embodiment of the present invention further provides an engine aperture size measuring apparatus, as shown in fig. 5, which is a schematic structural diagram of the embodiment of the apparatus, and the apparatus includes:
a current temperature obtaining module 81, configured to obtain a current workpiece temperature of the workpiece to be measured and a current ring gauge temperature of the standard ring gauge;
an aperture current measurement value obtaining module 82, configured to obtain a current measurement value of an aperture of the workpiece to be measured at the current workpiece temperature;
a first calculating module 83, configured to calculate a first temperature difference between the current ring gauge temperature and the standard temperature;
a second calculating module 84 for calculating a second temperature difference between the current workpiece temperature and a standard temperature;
a third calculating module 85, configured to calculate a first current compensation value corresponding to the first temperature difference according to the first corresponding relationship calculated in the first aspect;
a fourth calculating module 86, configured to calculate a second current compensation value corresponding to the second temperature difference according to the second corresponding relationship calculated in the first aspect;
a fifth calculating module 87, configured to calculate an aperture precise size value of the workpiece to be measured at the current workpiece temperature; wherein the aperture precise dimension value is a difference between the aperture current measurement value and a current total compensation value; the current total compensation value is a difference value between the second current compensation value and the first current compensation value.
Based on the same inventive concept as the previous embodiment, an embodiment of the present invention further provides an engine aperture size measuring apparatus, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of any one of the engine aperture size measurement compensation methods described above when executing the program.
Based on the same inventive concept as in the previous embodiments, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the engine aperture size measurement compensation methods described above.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the embodiment of the invention, firstly, a first corresponding relation between a ring gauge measurement compensation value and a corresponding temperature difference value is calculated according to the difference value between an inner diameter measurement value and a standard inner diameter measurement value under different temperatures and the difference value between a ring gauge temperature corresponding to the inner diameter measurement value and a standard temperature, then, a second corresponding relation between an aperture measurement compensation value and a corresponding temperature difference value is calculated according to the difference value between the aperture measurement value and a standard aperture measurement value and the difference value between a workpiece temperature corresponding to the aperture measurement value and the standard temperature, and then, the measurement compensation value of the aperture of the workpiece to be measured when the temperature error is not considered can be efficiently and accurately calculated by utilizing the first corresponding relation and the second corresponding relation, so that the accurate size value of the aperture of the workpiece to be measured when the temperature error is not considered is obtained.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
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