CN111251564A - System, method and application for measuring demolding force of polymer injection molding - Google Patents
System, method and application for measuring demolding force of polymer injection molding Download PDFInfo
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- CN111251564A CN111251564A CN202010203365.XA CN202010203365A CN111251564A CN 111251564 A CN111251564 A CN 111251564A CN 202010203365 A CN202010203365 A CN 202010203365A CN 111251564 A CN111251564 A CN 111251564A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229920000642 polymer Polymers 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 4
- 238000013178 mathematical model Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 239000000463 material Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7626—Measuring, controlling or regulating the ejection or removal of moulded articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7626—Measuring, controlling or regulating the ejection or removal of moulded articles
- B29C2045/7633—Take out or gripping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76006—Pressure
- B29C2945/7601—Pressure derivative, change thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76013—Force
- B29C2945/76016—Force derivative, change thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76177—Location of measurement
- B29C2945/7624—Ejection unit
- B29C2945/76244—Ejection unit ejectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76344—Phase or stage of measurement
- B29C2945/76421—Removing or handling ejected articles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
In order to solve the problem of unstable demoulding caused by adopting empirical judgment on demoulding force in the prior art, the invention provides a system, a method and an application for measuring the demoulding force of polymer injection moulding, comprising a mould for preparing an injection moulding sample, wherein the mould comprises a fixed mould and a core for moulding and a mandril component for ejecting the injection moulding sample; the injection molding device further comprises a detection assembly arranged on the mold and used for measuring the demolding force of the ejector rod assembly when the injection molding sample is ejected. The invention provides objective data for setting the demolding force, thereby improving the production efficiency and the product quality.
Description
Technical Field
The invention relates to the research in the field of polymer injection molding processing, in particular to a system for measuring demolding force in an injection molding demolding process, a measuring method and application thereof.
Background
Injection molding is one of the most common methods of polymer processing, and ejecting a shaped polymer article from a mold (usually a moving mold core) in a typical injection molding cycle is generally an essential step in removing the article from the mold. Because the polymer cooling can produce the power of holding tightly to the core, need overcome the frictional force that produces by holding tightly when the drawing of patterns. On the other hand, the adhesion between the polymer and the die steel and the atmospheric pressure must be overcome. The injection molding machine applies a mold release force to the article through the mold ejector pins which are in direct contact with the article to overcome the mold release resistance, and the article can be released from the mold only when the mold release force is greater than the mold release resistance.
In order to realize continuous normal injection molding production, on one hand, the total demolding force applied to a finished piece through a mold is required to be larger than demolding resistance, and on the other hand, the product is required to be capable of bearing the demolding force applied by a mandril; if the former can not be met, the product can not be separated from the die, and if the latter can not be met, the phenomenon that the product is deformed by the top or the material of the product corresponding to the ejector rod is white due to yielding occurs slightly, and the product is broken by the top if the product is heavy, and the product still remains in the die.
For the reasons, the demolding system of the part structure and the mold must be considered at the same time in the design stage so as to realize smooth demolding in continuous production finally. In the classic book literature (plastic molding molds, initials), methods for calculating release force based on simple structural parts and polymer physical properties at constant room temperature (usually 25 ℃) are recorded, but mold and part designers are usually designed based on past experience for the following reasons:
the physical properties of the polymer have stronger temperature dependence, the product temperature in the actual production process of demoulding is 25-125 ℃ higher than the room temperature in most cases, and the reduction of the demoulding force which can be born by demoulding the polymer at higher temperature is not negligible;
besides the technological parameters influencing the temperature of the product during demolding, other injection molding processes influence the physical properties of the material, such as injection molding pressure, cooling time and filling injection velocity, which have non-negligible influence on the physical properties of the material. The actual injection molding process has variable technological parameters, and finally the deviation between the demolding force and the theoretical calculated value is caused.
In addition, when the mold, the molding process, and the product structure are determined and different materials with different physical properties are used for production, the problem of poor demolding often occurs because the new material is difficult to match the original production condition. In actual production, often in order to pursue efficiency, the demolding of the product is generally estimated based on experience, resulting in unstable demolding in production.
Disclosure of Invention
In order to solve the problem of unstable demolding caused by empirical judgment of demolding force in the prior art, the invention provides a system, a method and application for measuring the demolding force of polymer injection molding, and the problem can be effectively solved.
In order to achieve the purpose, the invention adopts the specific scheme that: a system for measuring the demoulding force of polymer injection moulding comprises a mould for preparing an injection moulding sample, wherein the mould comprises a fixed mould and a core for moulding and a mandril component for ejecting the injection moulding sample; the method is characterized in that: the injection molding device further comprises a detection assembly which is arranged in the mold and used for measuring the demolding force of the ejector rod assembly when the injection molding sample is ejected.
The ejector rod component comprises an ejector rod; the ejector rod is arranged in the mold core in an inverted conical shape as one end of the demolding end, and the end part of the other end of the ejector rod is connected with the detection assembly and used for collecting pressure when the ejector rod is demolded.
The core is a columnar core.
The injection molding sample is a cup with a side wall and a bottom surface of 80-90 degrees.
The detection assembly comprises a force application plate, a pressure sensor and a PC end; the force application plate is arranged at the bottom of the ejector rod assembly and used for providing force required by demolding for the ejector rod assembly; the pressure sensor is arranged between the force application plate and the ejector rod assembly, connected with the PC end through a data line and used for acquiring demolding force data of the ejector rod assembly and sending the data to the PC end.
The force application plate is positioned on the opposite side of the ejector rod assembly and connected with the force application device.
A method for measuring the demoulding force, prepare the injection moulding sample through the core, for example prepare the injection moulding sample that the sidewall presents 80 degrees to 90 degrees with the bottom surface through the columnar core; and during demolding, the injection molding sample is ejected from the outer surface of the columnar core through the ejector rod, the demolding force data is detected through the pressure sensor and stored to the PC end, and the final demolding force is obtained from the PC end.
The method for obtaining the final demolding force by the PC terminal comprises the following steps: the PC terminal continuously acquires data of the pressure sensor in a period T, and a comparison value X is obtained by comparing the data of the next period with the data of the previous period; if the result of the comparison value X is positive, the ejector rod is demoulded, and the comparison value X is continuously collected; until the comparison value X shows a negative value, at which time the final stripping force value is the data of the previous cycle.
Use of a method for measuring release force for the estimation of release force, characterized in that: the method comprises the following steps:
the mold release force was estimated by the following mathematical model; qg＝Q×B；
Wherein Q isgThe corrected value of the demolding force is Q, and the theoretical value of the demolding force is Q; the adjustment coefficient B is 1+ (M-Q)/Q; where M is the final release force obtained from the PC end.
The theoretical value Q of the mold release force is calculated by the following method, wherein Q is A multiplied by h multiplied by p (mu cos α -sin α);
wherein A is the perimeter of the section of the core, h is the depth of the core in the plastic part, α is the demoulding inclination, mu is the friction coefficient, and P is the packing force.
Has the advantages that: according to the invention, the injection molding sample is prepared through the columnar mold core, and after injection molding, the injection molding sample is demoulded through the ejector rod assembly; in the demolding process, the data of the demolding force is acquired through the detection assembly; in order to guide production, the demolding force data is compared with the demolding force theoretical value to obtain the demolding force required in actual production, and finally, the guidance production is realized, so that the design of the demolding force is not set through experience any more. The invention provides objective data for setting the demolding force, thereby improving the production efficiency and the product quality.
Drawings
FIG. 1 is a schematic block diagram of a system for polymer injection molding ejection force measurement according to the present invention.
FIG. 2 is a schematic diagram of a system for measuring the mold release force of polymer injection molding according to the present invention.
Fig. 3 is a schematic structural view of the jack.
FIG. 4 is a front view of an injection molded sample.
FIG. 5 is a time curve of mold release force acquisition by the system for polymer injection molding mold release force measurement of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the prior art, the magnitude of the demolding force is basically obtained through experience, and an objective evaluation system is not provided, so that the unstable product is easy to occur in the production.
In order to improve the problems, the invention provides a system, a method and application for measuring the demolding force of polymer injection molding.
First, it is necessary to obtain the magnitude of the mold release force in actual work, which is calculated, unlike the theoretical value of the mold release force.
Among them, according to "calculation of core packing force and core releasing force by molding" the authors li sa li a mold industry 1996, published in 11 th: the theoretical value Q of the release force is calculated as follows:
Q＝A×h×p(μcosα-sinα)； (1)
wherein A is the perimeter of the section of the core, h is the depth of the core in the plastic part, α is the demoulding inclination, mu is the friction coefficient and takes 0.1-0.2, and P is the packing force and takes 0.8-1.2 MPa.
In order to facilitate the measurement of the actual release force, a mold for preparing an injection molded sample 5 having a release angle of a right angle was set.
The structure of the mould is as follows: as shown in FIGS. 1-4, the mold comprises a fixed mold 1 and a core 2 for molding and a mandril assembly 3 for ejecting an injection molding sample 5, wherein the core 2 is a columnar core; wherein, the mandril assembly 3 comprises a mandril 301; one end of the ejector rod 301 serving as a demoulding end is arranged in the mold core 2, and the end part of the other end of the ejector rod 301 is connected with the detection assembly 4 and used for collecting ejection force; the prepared injection-molded sample 5 was in the shape of a cup having a bottom surface at an angle of 80 to 90 ° to the side wall.
In order to realize the measurement of the demolding force, the ejector rod component 3 is provided with a detection component 4 for acquiring the demolding force when the injection molding sample 5 is ejected.
Specifically, the detection assembly 4 includes a force application plate 401, a pressure sensor 402 and a PC terminal 403;
wherein, the force application plate 401 is arranged at the bottom of the ejector rod assembly 3 and is used for providing force required by demoulding for the ejector rod assembly 3; the pressure sensor 402 is arranged between the force application plate 401 and the ejector rod assembly 3, is connected with the PC end 403 through a data line, and is used for acquiring demolding force data of the ejector rod assembly 3 and sending the data to the PC end 403; in specific production, the bottom of the force application plate 401 is connected with a device which can provide continuous thrust, such as an air cylinder, a hydraulic cylinder or an electric motor.
In the measurement, in order to concentrate the mold release force, the mold release end of the ejector pin 301 was set in an inverted cone shape.
In the process of obtaining the actual demolding force, a method for measuring the demolding force is used for preparing an injection molding sample 5 with a side wall vertical to a bottom surface through a columnar mold core; at the time of mold release, the injection molded sample 5 is ejected from the outer surface of the columnar core by the ejector pin 301, and the mold release force data is detected by the pressure sensor 402 and stored to the PC terminal 403, and the final mold release force is obtained from the PC terminal 403.
According to the graph shown in fig. 5, as the pressure sensor 402 collects data, a series of consecutive pressure values are obtained, which decrease sharply after demolding. Therefore, in order to obtain the final magnitude of the mold release force, the following method is adopted:
the method for obtaining the final demolding force by the PC terminal 403 comprises the following steps: the PC 403 continuously acquires data of the pressure sensor 402 in a period T, and obtains a comparison value X by comparing data of a subsequent period with data of a previous period; if the result of the comparison value X is positive, the ejector rod 301 is demoulded, and the comparison value X is continuously collected; until the comparison value X shows a negative value, at which time the final stripping force value is the data of the previous cycle.
It is to be understood that: in actual production, a plurality of injection molded samples 5 can be prepared, forming a plurality of data sets, forming an actual release force data set, which can be either a data point or a data range.
Since the prepared injection-molded sample 5 was shaped specifically, the mold release force was mainly concentrated on the circumferential side surface. The theoretical value of the mold release force for preparing the injection molding sample 5 can be conveniently obtained according to the formula (1) for calculating the theoretical value of the mold release force.
In order to guide production, the invention provides application of a method for measuring demolding force to demolding force estimation.
When the method for measuring the demolding force is applied to estimating the demolding force, the method comprises the following steps: and after the actual demolding force data is obtained, constructing a demolding force calculation model under the adjustment coefficient:
Qg＝Q×B； (2)
wherein Q isgThe corrected value of the demolding force is Q, and the theoretical value of the demolding force is Q; the adjustment coefficient B is 1+ (M-Q)/Q; wherein M is the final demoulding force obtained by the PC end (403); q is a theoretical value of the mold release force.
It is to be understood that: if the actual demolding force data are single data points, the actual demolding force data are applied in the mode as described above; and if the actual demolding force data is a data interval, carrying out average value calculation on the data interval to obtain an average value serving as a theoretical value of the actual demolding force and the demolding force to form an adjustment coefficient B, so as to guide production.
Specifically, it is assumed that 10 injection-molded samples 5 were prepared; the demolding force data detected by the detection assembly 4 are respectively Q1, Q2 and … … Q10; the average value of the release force is then: m ═ Q1+ Q2+ … … + Q10)/10 (3).
It is to be understood that: the mold described herein is normally designed with a runner, a cooling system, and an exhaust system, and the above technical solutions are known to those skilled in the art and are not described herein.
It is to be understood that: the PC terminal 403 may be connected to various terminals to display the demolding force data, including a mobile phone, a desktop computer, a notebook computer, a tablet computer, and a touch display screen with a collecting and recording function.
The invention has the following advantages:
1. the detection system disclosed by the invention is simple in structure, easy to install and connect and capable of quickly and quantitatively testing the real demolding force of the injection molding material.
2. The holding force of the test sample on the mold core is totally concentrated on the side wall of the mold core, and the influence of other sample structures on the demolding force test is eliminated. And a single ejector rod with the inverted cone-shaped top applies demolding force to the bottom of the inner side of the test sample, and the demolding force is concentrated.
3. The bottom of the ejector rod is provided with a pressure sensor, and the demolding force is measured by obtaining the reaction force of the sample on the ejector rod in the demolding process.
4. The invention realizes real-time visual monitoring and recording of the demolding force in each injection molding cycle by externally connecting a whole set of sensor data reading, analyzing and storing system to the mold.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily change or replace the present invention within the technical scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (10)
1. A system for measuring the demoulding force of polymer injection moulding is characterized by comprising a mould for preparing an injection moulding sample (5), wherein the mould comprises a fixed mould (1) and a core (2) for moulding and a mandril component (3) for ejecting the injection moulding sample (5);
the injection molding device also comprises a detection assembly (4) which is arranged on the mold and used for measuring the demolding force of the ejector rod assembly (3) when an injection molding sample (5) is ejected.
2. A system for polymer injection molding ejection force measurement according to claim 1, wherein: the push rod component (3) comprises a push rod (301); one end of the ejector rod (301) serving as a demolding end is arranged in the mold core (2) in an inverted cone shape, and the end part of the other end of the ejector rod (301) is connected with the detection assembly (4) and used for collecting pressure when the ejector rod (301) is demolded.
3. A system for polymer injection molding ejection force measurement according to claim 1 or 2, characterized in that the core (2) is a cylindrical core.
4. A system for polymer injection molding ejection force measurement according to claim 1, characterized in that the injection molded sample (5) is a cup with a bottom surface at 80 ° to 90 ° to the sidewall.
5. A system for polymer injection molding ejection force measurement according to claim 1, wherein the detection assembly (4) comprises an apply plate (401), a pressure sensor (402), and a PC terminal (403);
the force application plate (401) is arranged at the bottom of the ejector rod assembly (3) and is used for providing force required by demolding for the ejector rod assembly (3);
the pressure sensor (402) is arranged between the force application plate (401) and the ejector rod assembly (3), is connected with the PC end (403) through a data line, and is used for acquiring demolding force data of the ejector rod assembly (3) and sending the data to the PC end (403).
6. A system for polymer injection molding ejection force measurement according to claim 5, wherein the force application plate (401) is located on the opposite side of the ram assembly (3) and connected to the force application device.
7. A method of measuring a mold release force, characterized in that an injection molded sample (5) is prepared by a core, the injection molded sample (5) is ejected from an outer surface of the core by a ejector pin (301) at the time of mold release, and the data of the mold release force is detected by a pressure sensor (402) and stored to a PC terminal (403), and a final mold release force is obtained at the PC terminal (403).
8. The method for measuring the mold release force according to claim 7, wherein the method for obtaining the final mold release force by the PC terminal (403) comprises the following steps: the PC terminal (403) continuously acquires data of the pressure sensor (402) in a period T, and a comparison value X is obtained by comparing the data of the next period with the data of the previous period;
if the result of the comparison value X is positive, the ejector rod (301) is demoulded, and the comparison value X is continuously collected; until the comparison value X shows a negative value, at which time the final stripping force value is the data of the previous cycle.
9. Use of a method of measuring release force according to claim 7 for release force estimation.
10. Use of a method of measuring release force for release force estimation according to claim 9, comprising the steps of:
the mold release force was estimated by the following mathematical model; qg＝Q×B；
Wherein Q isgThe corrected value of the demolding force is Q, and the theoretical value of the demolding force is Q; the adjustment coefficient B is 1+ (M-Q)/Q; wherein M is the final demoulding force obtained by the PC end (403);
the theoretical value Q of the mold release force is calculated by A × h × p (μ cos α -sin α);
wherein A is the perimeter of the section of the core, h is the depth of the core embedded into the plastic part, α is the demoulding inclination, mu is the friction coefficient, and P is the packing force.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010203365.XA CN111251564A (en) | 2020-03-20 | 2020-03-20 | System, method and application for measuring demolding force of polymer injection molding |
| PCT/CN2020/131886 WO2021184822A1 (en) | 2020-03-20 | 2020-11-26 | System and method for measuring demolding force during polymer injection molding, and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010203365.XA CN111251564A (en) | 2020-03-20 | 2020-03-20 | System, method and application for measuring demolding force of polymer injection molding |
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| CN111251564A true CN111251564A (en) | 2020-06-09 |
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| WO2021184822A1 (en) * | 2020-03-20 | 2021-09-23 | 金发科技股份有限公司 | System and method for measuring demolding force during polymer injection molding, and application |
| CN120533879A (en) * | 2025-07-28 | 2025-08-26 | 苏州清馨健康科技有限公司 | Device and method for forming and processing toothpaste cap |
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| WO2021184822A1 (en) * | 2020-03-20 | 2021-09-23 | 金发科技股份有限公司 | System and method for measuring demolding force during polymer injection molding, and application |
| CN112765750A (en) * | 2021-01-27 | 2021-05-07 | 昆山乙盛机械工业有限公司 | Cylindrical core packing force calculation method, system and server |
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