CN115609237B - A method for processing high-hardness arc plates - Google Patents
A method for processing high-hardness arc platesInfo
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- CN115609237B CN115609237B CN202211248485.7A CN202211248485A CN115609237B CN 115609237 B CN115609237 B CN 115609237B CN 202211248485 A CN202211248485 A CN 202211248485A CN 115609237 B CN115609237 B CN 115609237B
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
A processing method of a high-hardness arc plate comprises the following steps: firstly, carrying out annealing treatment on a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, welding tooling flanges at two ends of the steel cylinder to obtain a process cylinder, then carrying out rough machining and annealing treatment on the process cylinder to eliminate welding stress, then turning and cutting the process cylinder into a semi-ring cylinder, releasing internal stress to obtain a support semi-ring cylinder, finally welding supports at two ends of the support semi-ring cylinder, and carrying out quenching treatment, correction and cutting on the support semi-ring cylinder to obtain a high-hardness arc plate; in the application of the design, the surface hardness of the steel coil is improved, the internal stress of the steel coil is fully released, and the deformation is reasonably controlled. Therefore, the invention is not only easy to process, but also not easy to deform.
Description
Technical Field
The invention relates to a processing method, belongs to the field of part processing, and particularly relates to a processing method of a high-hardness arc plate.
Background
According to the design requirement of products, the arc plate needs to meet the characteristics of thin wall, high precision and high hardness, and meanwhile, the circumference of the arc plate is also provided with uniformly distributed bolt mounting holes, so that the bolt hole position is also required to be higher, and the arc plate belongs to thin-wall parts with higher processing difficulty.
The invention application with the application number of 201310711370.1 and the application date of 2013, 12 and 20 discloses a forming method of a rolling arc wing, which mainly comprises the steps of arc plate forming, rolling arc wing welding forming, tempering and shape correcting, wherein the welding forming step is used for finishing structure forming by using methods of scribing sectional gate pressure, pre-welding reserved quantity, ordered limit welding and the like; and a quenching and tempering step, wherein the quenching deformation of the arc wings is reduced by using a local constraint and vacuum heat treatment method, so that the strength requirement is ensured.
Because the hardness of the part is high, the heat treatment quenching process is needed to improve the hardness, and the traditional processing method has the defects that after the surface hardness of the workpiece is improved, the processing process is difficult, the workpiece is easy to deform seriously, and the use requirement cannot be met.
The disclosure of this background section is only intended to increase the understanding of the general background of the application and should not be taken as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems that a high-hardness workpiece is difficult to process and easy to deform in the prior art, and provides a high-hardness arc plate processing method which is easy to process and difficult to deform.
In order to achieve the above purpose, the technical scheme of the invention is that the method for processing the high-hardness arc plate comprises the following steps:
Step one, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then welding tooling flanges at two ends of the steel cylinder respectively to obtain a process cylinder;
step two, rough machining is carried out on the inner cambered surface and the outer cambered surface of the process cylinder;
step three, annealing the process cylinder to release internal stress;
Step four, processing threaded perforations on the outer cambered surface of the process cylinder, and turning the inner cambered surface and the outer cambered surface of the process cylinder to a prefabricated size;
step five, cutting the process cylinder into a semi-ring cylinder along the axis of the process cylinder, and releasing internal stress;
Welding supports between two ends of the half tooling flange on the top surface of the semi-ring cylinder and between two ends of the half tooling flange on the bottom surface of the semi-ring cylinder to obtain a support semi-ring cylinder;
step seven, quenching the support semi-ring cylinder;
step eight, removing half tooling flanges at two ends of the support semi-ring cylinder to obtain a semi-ring arc plate, and then correcting the semi-ring arc plate;
And step nine, cutting the semi-circular arc plate into the required arc plate size according to the requirement, and finishing processing to obtain the high-hardness arc plate.
In the first step, the blank flat steel plate is put into a heating device with the temperature of 20-300 ℃, then the temperature of the heating device is raised to 790-810 ℃ and kept for 3-5 hours, then the temperature of the heating device is lowered to 700-720 ℃ and kept for 5-7 hours, and finally the blank flat steel plate is taken out after the temperature of the heating device is lowered to less than or equal to 350 ℃ to finish the annealing treatment.
In the first step, after the steel cylinder is rolled, the steel cylinder is corrected and polished to be cylindrical without obvious deformation, and then tooling flanges are welded at two ends of the steel cylinder respectively to obtain a process cylinder.
In the second step, the rough machining means turning the inner cambered surface and the outer cambered surface of the process cylinder until the surfaces of the inner cambered surface and the outer cambered surface have no obvious visible gaps or obvious rust and have visible metallic luster.
In the third step, the annealing treatment is carried out by placing the process cylinder into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 570-590 ℃, preserving heat for 5-7 hours, and then taking out the process cylinder after the temperature of the heating device is lowered to less than or equal to 300 ℃ to finish the annealing treatment.
In the fourth step, the prefabricated size refers to the machining allowance of the intrados, the extrados and the threaded perforation of the process cylinder on the basis of the required arc plate size.
In the fifth step, the release of the internal stress means that the semi-ring cylinder is naturally placed for 3-5 days.
In the seventh step, the semi-ring cylinder is placed into a heating chamber, the heating chamber is vacuumized to be less than or equal to 0.067Pa, then the heating chamber is heated to 850-870 ℃ for heat preservation, the heat preservation time is more than or equal to 2 hours, after the heat preservation is completed, the semi-ring cylinder is moved into a quenching chamber for quenching, the quenching oil temperature is 20-80 ℃, and the semi-ring cylinder is taken out after the quenching time is more than or equal to 20 minutes, so that the quenching is completed;
the operation before moving the support semi-ring cylinder into the quenching chamber for quenching is that the quenching chamber is vacuumized to be less than or equal to 0.067Pa, nitrogen is filled into the quenching chamber, and the nitrogen filling is stopped after the vacuum degree of the quenching chamber is increased to 1X 104 Pa-5X 104 Pa.
In the eighth step, the correction of the half-ring arc plate means that the outer arc surface and the inner arc surface of the half-ring arc plate are turned and corrected to the radian and the thickness required by the formed part.
In the fifth step and the ninth step, the cutting mode is wire cutting.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention discloses a processing method of a high-hardness arc plate, which comprises the steps of firstly carrying out annealing treatment on a blank flat steel plate and rolling the blank flat steel plate into a steel cylinder, welding fixture flanges at two ends of the steel cylinder to obtain a process cylinder, then carrying out rough machining and annealing treatment on the process cylinder to eliminate welding stress, then turning and cutting the process cylinder into a semi-ring cylinder, releasing internal stress to obtain a support semi-ring cylinder, finally welding and supporting the two ends of the support semi-ring cylinder, and carrying out quenching treatment, correction and cutting on the support semi-ring cylinder to obtain the high-hardness arc plate. Therefore, the invention is not only easy to process, but also not easy to deform.
2. The invention discloses a high-hardness arc plate processing method, which comprises the steps of firstly carrying out annealing treatment on a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder to obtain a process cylinder, carrying out annealing treatment on the blank steel plate to reduce the hardness of the blank steel plate, eliminate residual stress generated in rolling and cooling processes of the blank steel plate, prevent the blank steel plate from cracking in the rolling process, and be beneficial to subsequent processing.
3. In the method, the support semi-ring cylinder is placed into a heating chamber for vacuumizing, heating and heat preservation, and then the support semi-ring cylinder is placed into the heating chamber for quenching to finish the quenching treatment. Therefore, the invention is easy to process and can meet the requirements of workpieces.
Drawings
Fig. 1 is a schematic view of the structure of a process cylinder in the present invention.
Fig. 2 is a schematic structural view of a half-ring cylinder according to the present invention.
Fig. 3 is a top view of the support half ring cylinder of the present invention.
Fig. 4 is a schematic structural view of the semi-circular arc plate in the present invention.
In the figure, a process cylinder 1, a semi-ring cylinder 2, a support semi-ring cylinder 3, a semi-ring arc plate 4, a tooling flange 5, threaded perforations 6, a support 7 and a semi-tooling flange 8.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1-4, a method for processing a high-hardness arc plate, the method comprising the steps of:
step one, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then welding tooling flanges 5 at two ends of the steel cylinder respectively to obtain a process cylinder 1;
Step two, rough machining is carried out on the inner cambered surface and the outer cambered surface of the process cylinder 1;
step three, annealing the process cylinder 1 to release internal stress;
fourthly, machining threaded perforations 6 on the outer cambered surface of the process cylinder 1, and turning the inner cambered surface and the outer cambered surface of the process cylinder 1 to a prefabricated size;
step five, cutting the process cylinder 1 into a semi-ring cylinder 2 along the axis of the process cylinder, and releasing internal stress;
Step six, welding a support 7 between two ends of a half tooling flange 8 on the top surface of the semi-ring cylinder 2 and between two ends of a half tooling flange 8 on the bottom surface of the semi-ring cylinder 2 to obtain a support semi-ring cylinder 3;
step seven, quenching the support semi-ring cylinder 3;
step eight, removing half tooling flanges 8 at two ends of the support semi-ring cylinder 3 to obtain a semi-ring arc plate 4, and then correcting the semi-ring arc plate 4;
and step nine, cutting the semi-circular arc plate 4 into the required arc plate size according to the requirement, and finishing processing to obtain the high-hardness arc plate.
In the first step, the blank flat steel plate is put into a heating device with the temperature of 20-300 ℃, then the temperature of the heating device is raised to 790-810 ℃ and kept for 3-5 hours, then the temperature of the heating device is lowered to 700-720 ℃ and kept for 5-7 hours, and finally the blank flat steel plate is taken out after the temperature of the heating device is lowered to less than or equal to 350 ℃ to finish the annealing treatment.
In the first step, after the steel cylinder is rolled, the steel cylinder is corrected and polished to a cylindrical shape without obvious deformation, and then the tooling flanges 5 are welded at two ends of the steel cylinder respectively to obtain the process cylinder 1.
In the second step, the rough machining means turning the inner cambered surface and the outer cambered surface of the process cylinder 1 until the surfaces of the inner cambered surface and the outer cambered surface have no obvious visible gaps or obvious rust and have visible metallic luster.
In the third step, the annealing treatment is carried out by placing the process cylinder 1 into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 570-590 ℃, preserving the heat for 5-7 hours, and then taking out the process cylinder 1 after the temperature of the heating device is lowered to less than or equal to 300 ℃ to finish the annealing treatment.
In the fourth step, the prefabricated dimension refers to the machining allowance of the intrados, extrados and threaded perforation of the process cylinder 1 is reserved on the basis of the required arc plate dimension.
In the fifth step, the release of the internal stress means that the semi-ring cylinder 2 is naturally placed for 3-5 days.
Firstly, placing the support semi-ring cylinder 3 into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to be 850-870 ℃ for heat preservation, keeping the temperature for more than or equal to 2 hours, after the heat preservation is finished, moving the support semi-ring cylinder 3 into a quenching chamber for quenching, wherein the quenching oil temperature is 20-80 ℃, and taking out the support semi-ring cylinder after the quenching time is more than or equal to 20 minutes, thereby finishing the quenching treatment;
The operation before moving the support semi-ring cylinder 3 into the quenching chamber for quenching is that the quenching chamber is vacuumized to be less than or equal to 0.067Pa, nitrogen is filled into the quenching chamber, and the nitrogen filling is stopped after the vacuum degree of the quenching chamber is increased to 1X 104 Pa-5X 104 Pa.
In the eighth step, the correction of the half-ring arc plate 4 means that the outer arc surface and the inner arc surface of the half-ring arc plate 4 are turned and corrected to the radian and the thickness required by the formed part.
In the fifth step and the ninth step, the cutting mode is wire cutting.
The principle of the invention is explained as follows:
The high-hardness arc plate is divided into a 90-degree arc section and a 180-degree arc section, wherein the inner circle and the outer circle of the arc section are both required to be processed, the materials are high-carbon chromium bearing steel, the formed wall thickness of a part is 10mm, the maximum outer diameter radius is 439mm, the hardness requirement is more than 60HRC, and the hardness requirement is higher.
Example 1:
Referring to fig. 1-4, a method for processing a high-hardness arc plate, the method comprising the steps of:
Firstly, annealing a blank flat steel plate (preferably high-carbon chromium alloy steel) and then rolling the steel plate into a steel cylinder, and then respectively welding tooling flanges 5 at two ends of the steel cylinder to obtain a process cylinder 1;
Preferably, the annealing treatment comprises the steps of firstly placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 700-720 ℃ and preserving heat for 5-7 hours, finally lowering the temperature of the heating device to less than or equal to 350 ℃, and taking out the blank flat steel plate to finish the annealing treatment;
preferably, after the steel cylinder is rolled into the steel cylinder, the steel cylinder is corrected and polished to be cylindrical without obvious deformation, and then the tooling flanges 5 are welded at the two ends of the steel cylinder respectively to obtain the process cylinder 1;
step two, rough machining is carried out on the inner cambered surface and the outer cambered surface of the process cylinder 1, and the allowance is removed by 1mm;
step three, annealing the process cylinder 1 to release internal stress;
Preferably, the annealing treatment comprises the steps of firstly placing the process cylinder 1 into a heating device with the temperature ranging from 20 ℃ to less than or equal to 300 ℃, then raising the temperature of the heating device to 570 ℃ to 590 ℃, preserving the heat for 5 to 7 hours, and then taking out the process cylinder 1 after the temperature of the heating device is lowered to less than or equal to 300 ℃ to finish the annealing treatment;
Step four, machining a threaded through hole 6 on the outer cambered surface of the process cylinder 1, chamfering, and turning the inner cambered surface and the outer cambered surface of the process cylinder 1 to a prefabricated size, wherein 3mm machining allowance is reserved on each single side;
Step five, cutting the process cylinder 1 into a semi-ring cylinder 2 along the axis of the process cylinder, naturally placing for 3-5 days, and releasing internal stress, wherein the process cylinder is preferably wire-cutting
Step six, welding a support 7 between two ends of a half tooling flange 8 on the top surface of the semi-ring cylinder 2 and between two ends of a half tooling flange 8 on the bottom surface of the semi-ring cylinder 2 to obtain a support semi-ring cylinder 3 (preferably, the material of the support 7 is consistent with that of the semi-ring cylinder 2);
step seven, quenching the support semi-ring cylinder 3;
step eight, removing half tooling flanges 8 at two ends of the support semi-ring cylinder 3 to obtain a semi-ring arc plate 4, and then correcting the semi-ring arc plate 4;
And step nine, cutting the semi-circular arc plate 4 into the required arc plate size according to the requirement, and finishing the processing to obtain the high-hardness arc plate (preferably wire cutting).
Example 2:
the basic content is the same as in example 1, except that:
step seven, quenching the support semi-ring cylinder 3;
Firstly, placing the support semi-ring cylinder 3 into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to be 850-870 ℃ for heat preservation, keeping the temperature for more than or equal to 2 hours, after the heat preservation is finished, moving the support semi-ring cylinder 3 into a quenching chamber for quenching, wherein the quenching oil temperature is 20-80 ℃, and taking out the support semi-ring cylinder after the quenching time is more than or equal to 20 minutes, thereby finishing the quenching treatment;
The operation before moving the support semi-ring cylinder 3 into the quenching chamber for quenching is that the quenching chamber is vacuumized to be less than or equal to 0.067Pa, nitrogen is filled into the quenching chamber, and the nitrogen filling is stopped after the vacuum degree of the quenching chamber is increased to 1X 104 Pa-5X 104 Pa.
Example 3:
the basic content is the same as in example 1, except that:
And step seven, after quenching treatment is carried out on the support semi-ring cylinder 3, the inner cambered surface and the outer cambered surface of the support semi-ring cylinder 3 are subjected to dye check, if the support semi-ring cylinder is qualified, the step eight is carried out, if the support semi-ring cylinder is not qualified, the unqualified part is subjected to repair welding filling, and the dye check qualification standard is NB/T47013.5-2015 grade I.
Example 4:
the basic content is the same as in example 1, except that:
Step eight, removing half tooling flanges 8 at two ends of the support semi-ring cylinder 3 to obtain semi-ring arc plates 4, and then correcting the semi-ring arc plates 4 (preferably, machining by adopting a special CBN turning blade);
And step nine, linearly cutting the semi-ring arc plate 4 into a 90-degree arc plate and a 180-degree arc plate according to the requirement, and finishing processing to obtain the high-hardness arc plate.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.
Claims (8)
1. The method for processing the high-hardness arc plate is characterized by comprising the following steps of:
Firstly, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then welding tooling flanges (5) at two ends of the steel cylinder respectively to obtain a process cylinder (1), wherein the blank flat steel plate is made of high-carbon chromium alloy steel;
step two, rough machining is carried out on the inner cambered surface and the outer cambered surface of the process cylinder (1);
step three, annealing the process cylinder (1) to release internal stress;
fourthly, machining threaded perforations (6) on the outer cambered surface of the process cylinder (1), and turning the inner cambered surface and the outer cambered surface of the process cylinder (1) to a prefabricated size;
Step five, cutting the process cylinder (1) into a semi-ring cylinder (2) along the axis of the process cylinder, and releasing internal stress;
Welding supports (7) between two ends of a half tooling flange (8) on the top surface of the semi-ring cylinder (2) and between two ends of a half tooling flange (8) on the bottom surface of the semi-ring cylinder (2) to obtain a support semi-ring cylinder (3);
step seven, quenching the support semi-ring cylinder (3);
Step eight, removing half tooling flanges (8) at two ends of the support semi-ring cylinder (3) to obtain a semi-ring arc plate (4), and then correcting the semi-ring arc plate (4);
step nine, cutting the semi-circular arc plate (4) into the required arc plate size according to the requirement, and finishing processing to obtain a high-hardness arc plate, wherein the hardness requirement of the high-hardness arc plate is more than 60HRC;
Firstly, placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 720 ℃, preserving heat for 5 or 7 hours, finally, lowering the temperature of the heating device to less than or equal to 350 ℃, and taking out the blank flat steel plate to finish annealing treatment;
in the third step, the annealing treatment is carried out by firstly placing the process cylinder (1) into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 570-590 ℃, preserving the heat for 5 or 7 hours, then lowering the temperature of the heating device to less than or equal to 300 ℃, and taking out the process cylinder (1) to finish the annealing treatment;
In the step seven, the step of quenching treatment is that firstly, the support semi-ring cylinder (3) is placed in a heating chamber, the heating chamber is vacuumized to be less than or equal to 0.067Pa, then the heating chamber is heated to be 850-870 ℃ for heat preservation, the heat preservation time is more than or equal to 2 hours, after the heat preservation is completed, the support semi-ring cylinder (3) is moved into a quenching chamber for quenching, the quenching oil temperature is 20-80 ℃, and the support semi-ring cylinder is taken out after the quenching time is more than or equal to 20 minutes, so that the quenching treatment is completed.
2. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
In the first step, after the blank flat steel plate is rolled into a steel cylinder, the steel cylinder is corrected and grinded to be cylindrical without obvious deformation, and then tooling flanges (5) are welded at two ends of the steel cylinder respectively to obtain a process cylinder (1).
3. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
in the second step, the rough machining means turning the inner cambered surface and the outer cambered surface of the process cylinder (1) until the surfaces of the inner cambered surface and the outer cambered surface have no obvious visible gaps or obvious rust and have visible metallic luster.
4. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
In the fourth step, the prefabricated size refers to the machining allowance of the intrados, the extrados and the threaded perforation of the process cylinder (1) is reserved on the basis of the required arc plate size.
5. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
In the fifth step, the release of the internal stress means that the semi-ring cylinder (2) is naturally placed for 3-5 days.
6. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
The operation before the support semi-ring cylinder (3) is moved into the quenching chamber for quenching is that the quenching chamber is vacuumized to be less than or equal to 0.067Pa, nitrogen is filled into the quenching chamber until the vacuum degree of the quenching chamber is increased to 1X 104 Pa-5X 104Pa, and then the nitrogen filling is stopped.
7. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
in the eighth step, the correction of the half-ring arc plate (4) means that the outer arc surface and the inner arc surface of the half-ring arc plate (4) are turned and corrected to the radian and the thickness required by the formed part.
8. The method for processing the high-hardness arc plate according to claim 1, wherein the method comprises the following steps:
in the fifth step and the ninth step, the cutting mode is wire cutting.
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