A method and system for processing a female die cavity of a blanking die

Abstract

The application discloses a female die machining method and system for a punch-die, and the method comprises the following steps: processing the inner hole and the maximum profile circle of a hollow cylinder by using a numerical control lathe; polishing the two end faces of the processed hollow cylinder to make the two end faces parallel; milling the outer wall of the hollow cylinder based on the polished bottom face of the hollow cylinder to obtain a conical edge, wherein the conical edge is located on one side of the hollow cylinder; performing vacuum quenching and ice cooling on the milled hollow cylinder; and precisely polishing the two end faces of the hollow cylinder after the ice cooling by using a surface grinder. The method indirectly increases the wall thickness of the die edge by leaving a margin when processing the inner hole of the die edge through the numerical control lathe process, thereby ensuring the strength of the edge and the quality and machining precision of the numerical control coordinate grinder in processing the edge taper; and the material quenching hardness is improved in the heat treatment process, so that the die has high hardness, thereby improving the sharpness and wear resistance of the edge.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aviation equipment assembly die processing, and particularly relates to a processing method and system of a concave die of a special-shaped blanking die. BACKGROUND

[0002] The film seal on the engine is made by a concave die, and due to the existence of cotton silk in the film part, if the quality of the concave die edge is not good, the edge is broken or not sharp, the silk is easily pulled or the burr is easily generated in the process of blanking, which causes the film part to be scrapped. If the edges of the concave die are not in the same plane, the edge of the high side contacts the film part first, and the edge of the low side contacts the film part later, which causes the film part to be deformed after blanking, the size is unqualified, and the film part is scrapped.

[0003] Therefore, in order to ensure the qualified rate of the special-shaped film part, it is necessary to ensure that the concave die of the blanking die has a sharp and uniform blanking edge, and at the same time, all edges are in the same plane. The concave die is made of a material with high strength, high hardness, high toughness and high pressure resistance. In the processing process of the existing process method, stress is generated after heat treatment of the concave die, and stress deformation is generated in the process of numerical control milling and slow wire cutting. There is a datum alignment error between the two processes of slow wire cutting and numerical control milling, which causes a large angle error of the concave die. After processing, the edge profile of the concave die is offset, which causes the edge profile of the concave die to be offset. At the same time, if there is a distance error in the center of the part, the edge profile of the concave die will also be offset. After the edge profile of the concave die is offset, the edge profile of the concave die after finishing will have a difference, so that the edges are not in the same height plane. When the concave die blanks the film part, the film part is deformed, which causes the film part to be unqualified. After heat treatment, the concave die edge is milled by numerical control milling, a hard alloy milling cutter is selected, the milling cutter radius is smaller than the radius of the smallest arc in the special-shaped profile, the profile is processed by layering, the layering depth needs to be less than or equal to 0.01 mm to ensure the precision of the concave die edge and the 20° taper surface. The milling program capacity is large, the milling processing time is long, and the processing efficiency is low. Moreover, due to the high hardness of the material and the small diameter of the cutter, the cutting heat generated during milling is large, which easily causes the part to be annealed, and the cutter is easily worn. Once the cutter edge is worn, the cutter cannot be used any more and needs to be replaced with a new cutter for continuous processing. The cutter cost is high.

[0004] Finally, when the milling reaches the edge, the workpiece wall becomes thinner and thinner. Due to the influence of the cutting force of the cutter, the edge is easily broken, damaged or deformed, which causes the concave die edge to be of poor quality, and finally cannot cut out qualified film parts, so that the film blanking qualified rate is low. When the milling cutter approaches the edge, the edge is easily broken, damaged or deformed due to the influence of the cutting force, which affects the film blanking qualified rate. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for processing irregular blanking die dies, in order to solve the technical defects in the prior art, such as chipping, breakage, deformation, uneven height, and low processing efficiency during die processing.

[0006] To achieve the above objectives, the present invention adopts the following solution:

[0007] Firstly, a method for processing irregularly shaped blanking die cavities is provided, including:

[0008] Using a CNC lathe, the inner hole and the outer circle of the largest contour of a hollow cylinder are machined;

[0009] The two ends of the hollow cylinder after processing are ground to make the two ends of the hollow cylinder parallel;

[0010] Using the ground bottom surface of the hollow cylinder as a reference, the outer wall of the hollow cylinder is milled to obtain a conical cutting edge, which is located on one side of the hollow cylinder;

[0011] The milled hollow cylinder is subjected to vacuum quenching and cryogenic treatment.

[0012] The two ends of the hollow cylinder after the cryogenic treatment were precision ground using a surface grinder.

[0013] Hollow cylinders are machined using CNC coordinate grinding.

[0014] The hollow cylinder after CNC coordinate grinding is subjected to plunge grinding and contour grinding.

[0015] The hollow cylinder is cut using a slow wire EDM, and the conical cutting edge is then finished to obtain the die.

[0016] Furthermore, using a CNC lathe, the inner hole and the outer circle of the maximum contour of the hollow cylinder are machined, wherein the inner hole is machined with a machining allowance of 4mm to 6mm according to the minimum diameter of the cutting edge contour;

[0017] The outer circle of the maximum contour is machined with a machining allowance of 0.5mm to 2mm according to the maximum outer circle of the cutting edge contour, and the perpendicularity between the end face of the hollow cylinder and the inner hole is less than or equal to 0.02mm. The outer circle of the maximum contour is also ensured to be coaxial with the inner hole.

[0018] Furthermore, the step of grinding both ends of the processed hollow cylinder to make the two ends of the hollow cylinder parallel specifically includes:

[0019] A surface grinder is used to grind the two ends of the hollow cylinder to ensure that the two ends of the hollow cylinder are parallel to each other by 0.009~0.02mm.

[0020] Further, based on the polished hollow cylindrical bottom surface, the outer wall of the hollow cylinder is milled to obtain a conical edge, which is located on one side of the hollow cylinder, specifically comprising:

[0021] Based on the polished hollow cylindrical bottom surface, a numerical control milling machine is used to clamp and mill the process flat and the outer shape of the hollow cylinder at one time, so that the outer wall of the hollow cylinder has a conical edge.

[0022] Further, the milled hollow cylinder is subjected to vacuum quenching and ice cooling treatment, specifically comprising:

[0023] The milled hollow cylinder is subjected to vacuum quenching in a vacuum furnace, so that the hardness of the hollow cylinder reaches HRC58-62, and the deformation of the hollow cylinder is less than or equal to 0.02mm;

[0024] At the same time, the hollow cylinder after vacuum quenching treatment is subjected to ice cooling treatment.

[0025] Further, the two end faces of the hollow cylinder after ice cooling treatment are precisely ground by a surface grinder, specifically comprising:

[0026] The two end faces of the hollow cylinder are processed by the surface grinder to eliminate the deformation caused by quenching treatment, so that the surface roughness of the hollow cylinder reaches Ra0.2.

[0027] Further, the hollow cylinder is processed based on numerical control coordinate grinding, specifically comprising:

[0028] The hollow cylinder is installed on the magnetic table of the numerical control coordinate grinder, the process flat is straightened, and the inner hole of the hollow cylinder is aligned.

[0029] Further, the hollow cylinder after processing by the numerical control coordinate grinder is subjected to plunge grinding and contour grinding, specifically comprising:

[0030] CBN grinding wheel is selected to grind the outer wall and the conical edge of the hollow cylinder by plunge grinding and contour grinding;

[0031] In the plunge grinding process, the grinding wheel is inserted up and down along the taper direction of the conical edge based on the polished hollow cylindrical bottom surface, and the feed speed is 3HZ;

[0032] In the contour grinding process, the grinding wheel is fed along the contour of the conical edge of the hollow cylinder, and the hollow cylinder is fed clockwise along the outer contour and counterclockwise along the inner contour.

[0033] Further, the hollow cylinder is cut by slow wire cutting, and the conical edge is polished to obtain a concave die, specifically comprising:

[0034] Through multiple slow wire cutting, the diameter of the inner hole meets the requirements, and the concave die is obtained.

[0035] In a second aspect, a female blanking die concave die processing system is provided, comprising:

[0036] A processing module is configured to process the inner hole of the hollow cylinder and the maximum contour circle.

[0037] A polishing module is configured to polish the two end faces of the hollow cylinder to make the two end faces parallel.

[0038] A milling module is configured to mill the outer wall of the hollow cylinder.

[0039] A quenching module is configured to vacuum quench the milled hollow cylinder.

[0040] An ice cold treatment module is configured to cool the vacuum quenched hollow cylinder.

[0041] A cutting module is configured to cut the hollow cylinder.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] 1. The method indirectly increases the wall thickness of the concave die edge by leaving a 5mm allowance when processing the inner hole of the concave die edge during the numerical control turning process, ensures the strength of the edge, and ensures the quality and processing accuracy of the numerical control coordinate grinding machine processing edge taper; In the heat treatment process, the material quenching hardness is improved to ensure that the concave die has high hardness, thereby improving the sharpness and wear resistance of the edge. At the same time, the ice cold treatment of the part is increased, effectively reducing the deformation in the heat treatment process, reducing the material processing stress, avoiding the problems of edge deformation, damage, and edge height difference in the edge processing process, and improving the processing qualification rate; Through the finishing process, the grinding of the concave die edge taper is performed first to ensure the edge accuracy, and then the cutting of the inner hole of the edge is performed to avoid the problems of edge collapse, damage, deformation, and edge height difference in the edge processing process, thereby improving the processing qualification rate.

[0044] 2. The 5-axis linkage processing of the numerical control coordinate grinding machine is used, especially the plunge grinding and contour comprehensive tool path mode, and the feed F1 in unit time during plunge grinding is greater than the feed F2 in unit time during contour tool path, thereby improving the grinding efficiency and the grinding quality of the taper.

[0045] 3. By selecting a CBN grinding wheel with better cutting performance, the grinding wheel has small wear and high dimensional stability, and the universal straight grinding wheel is used to realize efficient grinding of the taper, thereby improving the processing efficiency and effectively reducing the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to make the technical scheme of the embodiments of the present application clearer, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0047] Figure 1 The flow chart of the processing method of the female die of the male-female blanking die provided by the present application;

[0048] Figure 2 The cross-sectional view of the film part;

[0049] Figure 3 The top view of the film part;

[0050] Figure 4 The cross-sectional view of the female die;

[0051] Figure 5 The schematic diagram of the female die blanking the film;

[0052] Figure 6 The schematic diagram of the blade collapse of the female die blanking the film;

[0053] Figure 7 The schematic diagram of the unsharpened blade of the female die blanking the film;

[0054] Figure 8 The schematic diagram of the unsharpened blade of the female die blanking the film;

[0055] Figure 9 The schematic diagram of the film deformation;

[0056] Figure 10 The schematic diagram of the blade taper of the female die;

[0057] Figure 11 The first schematic diagram of the blade profile angle offset of the female die;

[0058] Figure 12 The second schematic diagram of the blade profile angle offset of the female die;

[0059] Figure 13 The schematic diagram of the blade drop of the female die;

[0060] Figure 14 The schematic diagram of the blade collapse of the female die;

[0061] Figure 15 The schematic diagram of the numerical control processing of the hollow cylinder;

[0062] Figure 16 The first schematic diagram of the numerical control milling of the hollow cylinder;

[0063] Figure 17Second schematic diagram for hollow cylinder numerical control milling machine;

[0064] Figure 18 Schematic diagram for hollow cylinder flat grinding process;

[0065] Figure 19 Schematic diagram for hollow cylinder coordinate grinding process;

[0066] Figure 20 Schematic diagram for numerical control coordinate grinding machine;

[0067] Figure 21 Schematic diagram for grinding wheel;

[0068] Figure 22 First grinding schematic diagram;

[0069] Figure 23 Second grinding schematic diagram;

[0070] Figure 24 Slow wire cutting schematic diagram;

[0071] Figure 25 Principle diagram of female die machining system for different male die;

[0072] Wherein: 1, film; 2, female die; 3, broken blade; 4, wire drawing; 5, dull blade edge; 6, burr; 7, maximum profile outer circle; 8, female die blade edge profile; 9, inner type hole; 10, process flat; 11, outer shape profile blade edge; 12, milling area; 13, magnetic table; 14, workbench; 15, main shaft; 16, grinding wheel; 17, grinding wheel rod; 18, first cutting; 19, second cutting; 20, third cutting. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0074] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0075] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it need not be further defined and explained in subsequent views.

[0076] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0077] In addition, if the term "horizontal" is used, it does not mean that the part must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0078] As shown in Figures 2-3 , the film 1 seal on the engine is made by a concave die 2, as shown in Figure 4 and Figure 5 ; due to the presence of cotton silk in the film 1 part, if the concave die 2 blade quality is not good during the blanking process, as shown in Figure 6 and Figure 7 , chipping 3 or dull blade edge 5 occurs, which easily causes the silk to be pulled 4 or the burr 6 to occur during the blanking process, resulting in the film 1 part being scrapped, if such a situation occurs, the film 1 becomes waste and cannot be used. As shown in Figure 8 and Figure 9 , if the blade edge of the concave die 2 is not in the same plane, the high side of the blade edge contacts the film 1 part first, and the low side contacts the film 1 part later, which will cause the film 1 part to be deformed after blanking, resulting in unqualified dimensions and causing the film 1 part to be scrapped.

[0079] Therefore, in order to ensure the qualified rate of the profiled film 1 part, it is necessary to ensure that the concave die 2 of the blanking die has a sharp and uniform blanking blade edge, and at the same time, all the blade edges are in the same plane, as shown in Figure 10 . The concave die 2 is made of a material with high strength, high hardness, high toughness and high pressure resistance. During the processing of the existing process method, the concave die 2 will have stress after heat treatment, and stress deformation will occur during the finishing process of numerical control milling and slow wire cutting. There is a reference alignment error between the slow wire cutting process and the numerical control milling process, which will cause a large angle error of the concave die 2. After processing, the concave die blade edge contour 8 will have an angle deviation, which will cause the concave die blade edge contour 8 to deviate, as shown inFigure 11 At the same time, if the center of the part has a distance error, the die blade profile 8 will also be offset, as shown in Figure 12 When the die blade profile 8 is offset, the die 2 blade after finishing will have a gap, as shown in Figure 13 The blade is not on the same height plane, and when the die 2 punches the film 1 part, it will cause the film 1 part to deform, resulting in unqualified film 1 parts. After heat treatment, the die blade is milled by numerical control milling, a carbide milling cutter is selected, the milling cutter radius is smaller than the radius of the smallest arc in the special-shaped profile, and the profile is processed by layering, the layering processing depth needs to be less than or equal to 0.01mm, the milling program capacity is large, the milling processing time is long, and the processing efficiency is low. And because the material hardness is high and the cutter diameter is small, the cutting heat generated during milling is large, which is easy to cause the part to anneal, and the tool wear is large, once the milling cutter blade is worn, it cannot be used continuously, and a new tool needs to be replaced for continuous processing, and the tool cost is high;

[0080] Finally, when milling to the blade, the workpiece wall becomes thinner and thinner, and due to the influence of the cutting force of the tool, the blade is easy to produce chipping 3, damage or deformation, causing the die 2 blade to have poor quality, and finally unable to punch out qualified film 1 parts, and the film 1 punching qualification rate is low. When the milling cutter approaches the blade, due to the influence of the cutting force on the blade, chipping 3, damage or deformation is easy to occur, affecting the film 1 punching qualification rate, as shown in Figure 14 .

[0081] In order to solve the above technical defects, the inventors provide a special-shaped blanking die die machining method and system.

[0082] The application will be further described in detail below with reference to the drawings.

[0083] As shown in Figures 15-24 , the first aspect of the embodiment of the application provides a special-shaped blanking die die machining method, which comprises the following steps:

[0084] S101, using a numerical control lathe to process the inner hole of the hollow cylinder and the maximum profile outer circle; as shown in Figure 15 , using a numerical control lathe to process the inner hole 9 of the hollow cylinder and the maximum profile outer circle 7, wherein the inner hole 9 is processed with a machining allowance of 4mm-6mm according to the minimum diameter of the blade profile; the maximum profile outer circle 7 is processed with a machining allowance of 0.5mm-2mm according to the maximum outer circle of the blade profile, and the perpendicularity between the end face of the hollow cylinder and the inner hole 9 is less than or equal to 0.02mm, and the maximum profile outer circle 7 is coaxial with the inner hole 9 within 0.02mm.

[0085] S102, polish the two end faces of the processed hollow cylinder to make the two end faces of the hollow cylinder parallel; as an example, a surface grinder is used to polish the two end faces of the hollow cylinder to ensure that the two end faces of the hollow cylinder are parallel to 0.009-0.02mm.

[0086] S103, mill the outer wall of the hollow cylinder based on the polished bottom face of the hollow cylinder to obtain a conical edge, and the conical edge is located on one side of the hollow cylinder; as shown in Figure 16 and Figure 17 , as an example, a numerical control milling machine is used to mill the flat process blade 11, the hollow cylinder contour blade edge, the step area and the milling area 12 based on the polished bottom face of the hollow cylinder, the blade edge is 20°, and the conical surface is uniformly left to be polished 0.2mm-0.3mm, so that the outer wall of the hollow cylinder has a conical edge.

[0087] S104, vacuum quenching and ice cooling treatment are performed on the milled hollow cylinder; as an example, a vacuum furnace is used to perform vacuum quenching on the milled hollow cylinder, so that the hardness of the hollow cylinder reaches HRC58-62, and the deformation of the hollow cylinder is less than or equal to 0.02mm; at the same time, ice cooling treatment is performed on the hollow cylinder after vacuum quenching treatment to reduce the stress deformation in subsequent processing.

[0088] S105, the two end faces of the hollow cylinder after ice cooling treatment are precisely polished by a surface grinder; as shown in Figure 18 , as an example, the two end faces of the hollow cylinder are precisely polished by a surface grinder to eliminate the deformation caused by quenching treatment, so that the surface roughness of the hollow cylinder reaches Ra0.2, and the parallelism is less than or equal to 0.01mm.

[0089] S106, the hollow cylinder is processed based on numerical control coordinate grinding; as shown in Figure 19 , as an example, the hollow cylinder is installed on the magnetic table 13 of the numerical control coordinate grinder, the process flat 10 is straightened, and the inner hole 9 of the hollow cylinder is aligned; first, the inner hole 9 and the process flat 10 are ground, which needs to be completed in one clamping, to ensure that the cylindricity of the inner hole 9 is 0.005mm, and the process flat 10 is axially parallel and perpendicular to the inner hole 9 by 0.005mm.

[0090] S107, the hollow cylinder after numerical control coordinate grinding is inserted and ground in a contour cutting mode; as an example, a numerical control coordinate grinder is selected, the concave die 2 is sucked on the magnetic table 13 during processing, the process flat 10 is straightened, and the inner hole 9 is aligned; first, the inner hole 9 and the process flat 10 are ground, which needs to be completed in one clamping, to ensure that the cylindricity of the inner hole 9 is 0.005mm, and the process flat 10 is axially parallel and perpendicular to the inner hole 10 by 0.005mm; the inserted grinding and contour cutting mode is realized by the linkage control of the X-axis, Y-axis, C-axis, U-axis and Z-axis of the numerical control coordinate grinder. Figure 20As shown; the contour cutting is achieved using the X, Y, and C axes along the contour 8 of the die cutting edge. The grinding wheel 16 is mounted on the spindle 15 via the grinding wheel rod 17. The up and down grinding of the grinding wheel 16 is achieved using the U and Z axes along the 20° conical surface direction. Simultaneous contour cutting and up and down grinding are performed, achieving 5-axis linkage grinding, resulting in high machining accuracy, good dimensional stability, and high machining efficiency. A CBN grinding wheel 16 with a grit size of 200 is selected as the tool. CBN grinding wheels are wear-resistant, have low wear, and provide stable grinding dimensions. Their cutting force is stronger than that of milling cutters of the same diameter, resulting in better cutting performance. In the above parameter settings for the grinding wheel 16, the radius of the grinding wheel 16 must be smaller than the smallest concave arc radius in the contour of the irregular die 2. The smallest concave arc radius in the part's shape is 3mm, therefore the radius of the grinding wheel 16 must be less than 3mm. A CBN grinding wheel 16 with a radius of 2.5mm is selected. Figure 21 As shown.

[0091] The grinding process involved in this step, such as Figure 22 and Figure 23 As shown, using the flat-ground bottom surface as a reference, the grinding wheel 16 plunges up and down along the 20° taper of the die cutting edge, with a feed rate of F1 of approximately 3 Hz. Simultaneously, the grinding wheel moves along the die cutting edge contour 8. To improve the grinding effect, when moving along the die cutting edge contour 8, the outer contour feeds clockwise, and the inner contour feeds counterclockwise. During the grinding of this part, the contour movement is selected clockwise, with a feed rate F2 of 35-40 mm / min, and this is a constant feed rate. At this time, F1 must be greater than F2 per unit time to ensure that, when moving along the contour, at the same contour position, the grinding wheel must complete at least one 20° taper grinding operation, thereby guaranteeing grinding quality and efficiency.

[0092] S108. The hollow cylinder is cut using a slow wire EDM machine, and the conical cutting edge is finished to obtain the die. For example... Figure 24 As shown, by way of example, slow wire cutting is used to straighten the process flatness ground in step 6, and to align the inner hole ground in step 6. The alignment error is controlled within 0.002mm. The inner die is rough-cut to remove the 5mm allowance left by the CNC turning process, leaving a 0.2mm-0.3mm allowance. The inner die is semi-finished with a 0.03mm-0.05mm allowance. The inner die is finished with a 0.002mm-0.003mm allowance. Through the first cut 18, the second cut 19, and the third cut 20, the three cuts ensure the dimensional accuracy of the inner die and the surface roughness Ra0.2.

[0093] Secondly, this embodiment provides a non-standard blanking die cavity processing system, such as... Figure 25 As shown, it includes:

[0094] The machining module is used to machine the inner hole and the outer circle of the maximum contour of the hollow cylinder;

[0095] A polishing module is configured to polish two end faces of the hollow cylinder so as to make the two end faces of the hollow cylinder parallel to each other;

[0096] A milling module is configured to mill the outer wall of the hollow cylinder;

[0097] A quenching module is configured to quench the hollow cylinder after the milling;

[0098] An ice cooling module is configured to cool the hollow cylinder after the quenching;

[0099] A cutting module is configured to cut the hollow cylinder.

[0100] It should be finally pointed out that the above embodiments are only used for illustrating the technical solutions of the present application but not for limiting the protection scope thereof, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be changed, modified or replaced by equivalents after reading the present application, but these changes, modifications or replacements by equivalents are all within the protection scope of the claims of the present application.

Claims

1. A method of processing a female die of a blanking die, characterized by, The application relates to a method for manufacturing a hollow cylinder. The inner hole and the maximum profile outer circle of the hollow cylinder are processed by using a numerical control lathe, and a machining allowance is reserved; The two end faces of the processed hollow cylinder are polished to make the two end faces of the hollow cylinder parallel; The outer wall of the hollow cylinder is milled based on the polished bottom face of the hollow cylinder to obtain a conical edge, and the conical edge is located on one side of the hollow cylinder; The milled hollow cylinder is subjected to vacuum quenching and ice cooling treatment; The two end faces of the hollow cylinder after the ice cooling treatment are precisely polished by using a surface grinder; The hollow cylinder is processed based on numerical control coordinate grinding; The outer wall and the conical edge of the hollow cylinder are ground by using CBN grinding wheels through plunge grinding and profile feed grinding; In the plunge grinding process, the grinding wheel is inserted up and down along the conical edge in the conical direction based on the polished bottom face of the hollow cylinder, and the feeding speed is 3HZ; In the profile feed grinding process, the grinding wheel is fed along the profile of the conical edge of the hollow cylinder in the clockwise direction for the outer profile of the hollow cylinder and in the counterclockwise direction for the inner profile of the hollow cylinder; The hollow cylinder is cut by using slow wire cutting, and the conical edge is polished to obtain a concave die.

2. The coining method of claim 1 wherein, The inner hole and the maximum profile outer circle of the hollow cylinder are processed by using a numerical control lathe, wherein the inner hole is processed with a machining allowance of 4mm-6mm according to the minimum diameter of the edge profile; The maximum profile outer circle is processed with a machining allowance of 0.5mm-2mm according to the maximum outer circle of the edge profile, the perpendicularity between the end face of the hollow cylinder and the inner hole is less than or equal to 0.02mm, and the maximum profile outer circle is coaxial with the inner hole.

3. The method of claim 1 wherein, The two end faces of the processed hollow cylinder are polished to make the two end faces of the hollow cylinder parallel, and the polishing process specifically comprises the following steps: The two end faces of the hollow cylinder are polished by using a surface grinder to ensure that the two end faces of the hollow cylinder are parallel to each other within a range of 0.009-0.02mm.

4. The method of claim 1 wherein, The outer wall of the hollow cylinder is milled based on the polished bottom face of the hollow cylinder to obtain a conical edge, and the conical edge is located on one side of the hollow cylinder, and the milling process specifically comprises the following steps: The outer wall of the hollow cylinder is milled based on the polished bottom face of the hollow cylinder to obtain a conical edge, and the conical edge is located on one side of the hollow cylinder, and the milling process specifically comprises the following steps:

5. The method of claim 1 wherein, The milled hollow cylinder is subjected to vacuum quenching and ice cooling treatment, and the treatment process specifically comprises the following steps: The milled hollow cylinder is subjected to vacuum quenching by using a vacuum furnace to make the hardness of the hollow cylinder reach HRC58-62 and the deformation of the hollow cylinder be less than or equal to 0.02mm; Meanwhile, the hollow cylinder after the vacuum quenching treatment is subjected to ice cooling treatment.

6. The method of cup drawing of claim 1 wherein, The two end faces of the hollow cylinder after the ice cooling treatment are precisely polished by using a surface grinder, and the polishing process specifically comprises the following steps: The two end faces of the hollow cylinder are polished by using a surface grinder to eliminate the deformation caused by the quenching treatment, so that the surface roughness of the hollow cylinder reaches Ra0.

2.

7. The method of claim 1 wherein, The hollow cylinder is processed based on numerical control coordinate grinding, and the processing process specifically comprises the following steps: The hollow cylinder is installed on a magnetic table of the numerical control coordinate grinder, the process flat is straightened, and the inner hole of the hollow cylinder is aligned.

8. The method of cupping according to claim 1, wherein Slow wire cutting is used to cut a hollow cylinder, and the taper edge is polished to obtain a concave die, which specifically comprises the following steps: Through multiple slow wire cutting, the diameter of the inner hole is ensured to meet the requirements, and the concave die is obtained.

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