A valve plate blanking die and blanking process

Abstract

The application relates to a valve piece blanking die and a blanking process, and belongs to the technical field of stamping metals, which comprises a lower die mechanism and an upper die mechanism. The lower die mechanism comprises an elastic counter-jacking assembly and a lower die, the lower die is internally provided with a vertically-extended punching groove, and the elastic counter-jacking assembly is arranged in the punching groove. The elastic counter-jacking assembly is raised to extrude a material plate and form a pre-shearing recess. The upper die mechanism comprises a shearing punch and an upper die, the upper die is internally provided with a blanking channel coaxial with the punching groove, the shearing punch is arranged in the blanking channel and coaxially arranged with the elastic counter-jacking assembly, and the shearing punch is lowered to blank the material plate on the back of the pre-shearing recess and form a valve piece. The elastic counter-jacking assembly can provide a reverse jacking force when blanking the material plate without affecting the formation of the pre-shearing recess, so that the incision of the shearing punch is smoother when blanking the material plate.

Description

Technical Field

[0001] This application relates to the field of stamping metal technology, and in particular to a valve plate stamping die and stamping process. Background Technology

[0002] Stamping dies are widely used in valve plate manufacturing. Valve plates are usually formed by stamping and shearing steel strips. The cross-sectional quality of the valve plate directly affects its working performance and service life. The traditional single-step shearing process, which completes the shearing of the steel strip in one go through the direct action of the upper and lower dies, is simple in principle and low in cost, but the cross-sectional quality is easily affected by factors such as material plasticity and die clearance.

[0003] The prior art relates to a valve plate punching die, including an upper die mechanism and a lower die mechanism. The upper die mechanism includes an upper die base, an upper back plate, an upper pad plate, and an upper clamping plate arranged sequentially from top to bottom. The lower part of the upper clamping plate is fitted with several limiting components for limiting the punches mounted on the upper die base. The lower die mechanism includes a lower die base, and the bottom of the lower die base is provided with several support blocks. Adjacent support blocks are fitted with material guiding components for guiding material. By setting multiple punches and limiting components that cooperate with the punches, multiple valve plates can be punched at high speed, thereby improving the punching efficiency.

[0004] In the aforementioned and existing stamping dies for valve plates, the lower surface of the material plate is generally suspended during the stamping process. Consequently, when the material plate is stamped by the punch, it will be subjected to enormous tensile stress, resulting in burrs and rough surfaces on the edges of the material plate, and even cracks in the material plate, leading to a low yield rate. Summary of the Invention

[0005] This application provides a valve plate punching die, which can solve the problem that existing valve plate punching dies may cause burrs on the edge of the valve plate or even cracks in the material plate when punching to form the valve plate.

[0006] The technical solution of this application is as follows: A valve plate punching die, comprising:

[0007] The lower die mechanism includes an elastic anti-push component that can move up and down and a lower die. The lower die has a vertically extending groove inside. The elastic anti-push component is disposed inside the groove. The elastic anti-push component moves upward to extrude the material plate to form a pre-shearing recess.

[0008] The upper die mechanism includes a shearing punch that can move up and down and an upper die. The upper die has a punching channel coaxial with the punching groove inside. The shearing punch is disposed inside the punching channel and coaxial with the elastic anti-top component. The shearing punch moves down to punch the material plate on the back of the pre-sheared recess to form a valve plate.

[0009] The elastic anti-top component is configured to provide flexible buffering during the formation of the pre-shear indentation; and,

[0010] During the blanking process, the pre-shearing recess is pressed against to change the stress state of the blank.

[0011] By adopting the above scheme and setting up a retractable elastic anti-top component, the device compresses the material plate with the elastic anti-top component. Since the material plate itself has strength, the elastic anti-top component retracts itself, changing from an elastic component to a rigid component. After becoming a rigid component, it continues to compress the material plate to form a pre-shear indentation. At the same time, the process of the elastic anti-top component changing from elastic to rigid, i.e., the retraction process, can also reduce the reaction impact of the material plate. The formation of the pre-shear indentation can also change the stress distribution of the material plate itself, so that stress concentration points are formed in advance when the material plate is punched, reducing the occurrence of cracks during punching.

[0012] In addition, the elastic anti-top component can anti-top the material plate at the pre-shearing recess when the device is punching, so that the material plate changes from the original tensile stress to triaxial compressive stress, which improves the ductility of the material plate itself and makes the cut of the shearing punch when punching the material plate smoother.

[0013] In one embodiment of this application, the upper die mechanism further includes a blank holder assembly, wherein two sets of blank holder assemblies are provided, and the two sets of blank holder assemblies are respectively disposed on both sides of the shearing punch. The blank holder assembly includes:

[0014] A pressing drive is provided, wherein the upper mold has a pressing channel extending in a vertical direction, and the pressing drive is disposed at the upper end of the pressing channel;

[0015] A pressure rod is connected and fixed to the drive shaft of the pressure drive component and is located at the lower end of the pressure channel.

[0016] By adopting the above scheme, by setting up pressure components on both sides of the punching channel, and cooperating with independently controlled pressure drive components, the material plate can be pressed against the surface of the lower die before the elastic anti-roll component is activated. This prevents the material plate from arching or shifting due to pressure at the bottom, and also provides stable boundary constraints for subsequent pre-shearing, so that the pre-shearing recess and the downward shearing punch remain coaxially aligned.

[0017] In one embodiment of this application, the upper mold mechanism further includes a guide component, the guide component comprising:

[0018] Guide posts, two guide posts are provided, with one end of each guide post respectively located on both sides of the shearing punch;

[0019] The sliding joint is provided in two parts. The other end of the guide post passes through the upper mold. The sliding joint is assembled inside the upper mold and sleeved on the outside of the guide post. The sliding joint is slidably connected to the guide post.

[0020] By adopting the above scheme and setting guide posts and sliding joints, the blanking gap between the shearing punch and the lower die groove is kept constant, thereby ensuring the blanking accuracy of the valve plate.

[0021] In one embodiment of this application, the resilient anti-top component includes:

[0022] An extrusion drive rod is provided below the extrusion drive rod, one end of the extrusion drive rod is coaxially connected and fixed to the drive shaft of the second telescopic drive member, and the other end of the extrusion drive rod extends into the groove and is slidably connected to the inner wall of the groove.

[0023] An elastic component is fixedly mounted at one end to the other end of the extrusion drive rod, and an extrusion head assembly is mounted at the other end.

[0024] By adopting the above scheme, and by connecting the second telescopic drive component with the elastic anti-top component, the elastic component and the extrusion head can transform the displacement input by the second telescopic drive component into a composite action of first flexible contact buffering and then rigid limiting extrusion. This enables complex stress control actions to be completed under ordinary punch presses, and also facilitates subsequent maintenance and debugging.

[0025] In one embodiment of this application, the resilient component includes:

[0026] A guide limiting component, comprising a guide tube and a guide segment, wherein one end of the guide tube is fixedly mounted on the other end face of the extrusion drive rod, and one end of the guide segment is fixedly connected to the extrusion head assembly, and the other end extends into the interior of the guide tube and is slidably connected to the guide tube;

[0027] Two elastic elements are provided and are respectively disposed on both sides of the guide limiting member. The two ends of the elastic elements are respectively connected and fixed to the extrusion head assembly and the extrusion drive rod.

[0028] By adopting the above technical solution, when the valve plate is extruded to form a pre-shear indentation, the extrusion head assembly is first compressed, and the guide tube and guide section slide relative to each other. The elastic force generated by the compressed elastic element not only buffers the contact impact, but also provides pre-tightening force for the material plate. At the same time, in the subsequent punching stage of the material plate, the elastic force of the elastic element can continuously apply a reverse pushing force to the bottom of the material plate, effectively suppressing the propagation of shear cracks.

[0029] In one embodiment of this application, the inner wall of the guide tube is provided with circumferentially distributed keyways, the keyways extending along the length direction of the guide tube, and the outer circumferential of the guide section is provided with key strips adapted to the keyways.

[0030] By adopting the above scheme, and by setting keyways and key bars between the guide tube and the guide joint, the guide tube and the guide joint can perform axial telescopic movement while restricting their circumferential displacement, thereby improving the torsional resistance of the elastic component.

[0031] In one embodiment of this application, the extrusion head assembly includes:

[0032] The extrusion column has a threaded groove extending along its own length on its outer surface, and the elastic element and the guide joint are both connected and fixed to one end face of the extrusion column.

[0033] A threaded collar is fitted over the outside of the extrusion column and is threadedly connected to the extrusion column.

[0034] By adopting the above scheme, when the extrusion column extrudes the material plate, the guide limiter retracts and brings the threaded collar closer to the extrusion drive rod. During the approach process, the elasticity of the elastic element effectively buffers the contact impact on the extrusion drive rod until the threaded collar slides into contact with the extrusion drive rod. At this time, the entire elastic anti-top assembly changes from flexible to rigid and continues to extrude the material plate to form a pre-shear indentation. At the same time, when it is necessary to adjust the depth of the pre-shear indentation according to the thickness of the material plate, the distance between the threaded collar and the extrusion drive rod in the natural state of the elastic element is adjusted by rotating the threaded collar. Thus, the device can adjust the depth of the pre-shear indentation by adjusting the position of the threaded collar without ensuring that the total stroke of the second telescopic drive component remains unchanged.

[0035] In one embodiment of this application, the elastic element is a nitrogen spring.

[0036] In one embodiment of this application, the lower mold mechanism further includes a top plate assembly, the top plate assembly comprising:

[0037] A fixed base is provided, wherein a placement groove is provided on the surface of the lower mold, and the fixed base is fixedly assembled to the inner wall of the bottom end of the placement groove;

[0038] A lifting seat is slidably assembled on the upper end of the fixed seat. A lifting elastic element is provided between the lifting seat and the fixed seat. The upper end face of the lifting seat protrudes from the surface of the lower mold.

[0039] By adopting the above scheme and setting a top plate assembly with a lifting elastic element, after the punching is completed, the lifting seat lifts the material plate and suspends it above the lower die surface under the action of the lifting elastic element. This makes it convenient for the feeding mechanism to quickly move the material plate for the next punching. At the same time, the elastic force of the lifting elastic element itself can be used to assist in pressing the material plate when the die is closed.

[0040] The second objective of this invention is to provide a valve plate punching process.

[0041] The technical solution is as follows: A valve plate punching process, which uses a valve plate punching die to prepare valve plates, includes the following steps:

[0042] Step 1: Adjust the valve plate punching die according to the characteristics of the material plate to preset the depth of the pre-shear indentation formed by the elastic anti-top component;

[0043] Step 2: Open the mold and place the material plate, and close the mold to control the second telescopic drive to drive the elastic anti-top component to move upward, so as to squeeze the material plate and form a pre-shearing depression;

[0044] Step 3: Control the second telescopic drive to reset, and control the first telescopic drive to drive the shearing punch to punch the back of the pre-sheared recess to obtain the valve plate;

[0045] Step 4: Control the first telescopic drive component to reset, and the elastic anti-push component uses its own elastic force to push the valve plate out of the groove;

[0046] Step 5: Recover the valve plate and move the material plate for the next punching operation.

[0047] By adopting the above scheme, the device first extrudes a pre-shearing depression on the material plate according to the thickness of the material plate before punching, so as to change the stress distribution of the material plate itself and reduce the possibility of burrs forming when the material plate is punched. At the same time, by adjusting the threaded collar, the device can conveniently and efficiently adjust the depth of the pre-shearing depression according to different material plate thicknesses and materials.

[0048] In summary, this application includes at least one of the following beneficial technical effects: by setting an elastic anti-top component, the flexible buffer is achieved in the early stage of the extrusion stage during the valve plate punching process by utilizing the idle stroke of the elastic component, avoiding the rigid impact of the carbide punch on the high-hardness plate. In the late stage of extrusion, rigid limiting is achieved by the contact between the threaded collar and the extrusion drive rod, thereby performing pre-plastic deformation on the plate, so that the plate can have a pre-set stress concentration point inside before being punched, thereby reducing the possibility of burr generation.

[0049] By setting up a stroke compensation structure consisting of a threaded collar, an extrusion column, and a guide limiting component, the device can change the stroke of the elastic element during the compression stage by rotating and adjusting the position of the threaded collar. Thus, while keeping the stroke of the second telescopic drive component constant, the depth of the pre-shear indentation can be adjusted, which is more convenient and faster. It can also be adjusted and compensated according to the error of the servo press or complex hydraulic control system, ensuring accuracy.

[0050] By setting a coaxial elastic anti-top component below the shearing punch, the elastic anti-top component under compression can actively apply hydrostatic pressure to the shear section of the material plate during the extrusion stage. This transforms the stress state of the material plate shearing zone from a composite stress of tension and shear to a triaxial compressive stress state, thereby improving the ductility of the material plate and further reducing the burrs and tear layers generated by the valve plate. Attached Figure Description

[0051] Figure 1 This is a front sectional view of a valve plate punching die provided in the embodiments of this application;

[0052] Figure 2 This is a front sectional view of a valve plate punching die elastic anti-ejection assembly extruding a material plate according to an embodiment of this application;

[0053] Figure 3 This is a three-dimensional schematic diagram of an elastic anti-ejection component for a valve plate punching die provided in the embodiments of this application;

[0054] Figure 4 This is a front sectional view of a valve plate punching die elastic element in its natural state, provided in an embodiment of this application.

[0055] Figure 5 This is a front sectional view of a valve plate punching die elastic element in a compressed state, provided in an embodiment of this application.

[0056] Figure 6 This is a top sectional view of a keyway for a valve plate punching die guide and limiting component provided in the embodiments of this application;

[0057] Figure 7 This is a three-dimensional schematic diagram of a valve plate punching die top plate assembly provided in the embodiments of this application;

[0058] Figure 8 This is a schematic perspective view of a valve plate punching die pressing assembly provided in the embodiments of this application;

[0059] Figure 9 It is a cross-sectional drawing of the valve plate after it has been punched using a conventional punching die;

[0060] Figure 10This is a cross-sectional view of a valve plate after it has been punched by a valve plate punching die provided in the embodiments of this application.

[0061] Explanation of reference numerals in the attached drawings: 1. Lower die mechanism; 11. Elastic anti-ejection assembly; 111. Extrusion drive rod; 112. Elastic assembly; 1121. Guide tube; 1122. Guide joint body; 1123. Keyway; 1124. Key strip; 1125. Elastic element; 113. Extrusion head assembly; 1131. Extrusion column; 1132. Threaded collar; 12. Lower die; 121. Punch groove; 13. Top plate assembly; 131. Fixed seat; 132. Lifting seat; 2. Upper die mechanism; 21. Shearing punch; 22. Punching channel; 23. Upper die; 24. Pressure assembly; 241. Pressure drive component; 242. Pressure rod; 25. Guide assembly; 251. Guide column; 252. Sliding joint; 3. Material plate; 31. Pre-shearing recess. Detailed Implementation

[0062] The following is in conjunction with the appendix Figures 1-10 This application provides a more detailed description of a valve plate punching die and punching process. Specifically, to clearly illustrate the positions of the various components within the lower die mechanism 1 and the upper die mechanism 2, Figure 1 This is a cross-sectional view showing only the upper mold 23 and the lower mold 12.

[0063] Please see Figure 1 and Figure 2 The valve plate punching die provided in this application includes a lower die mechanism 1 and an upper die mechanism 2. The lower die mechanism 1 includes an elastic anti-push component 11 that can move up and down and a lower die 12. The lower die 12 has a vertically extending punch groove 121 inside. The elastic anti-push component 11 is disposed inside the punch groove 121. The elastic anti-push component 11 moves upward to extrude the material plate 3 to form a pre-shearing recess 31. The upper die mechanism 2 includes a shearing punch 21 that can move up and down and an upper die 23. The upper die 23 has a punching channel 22 coaxial with the punch groove 121. The shearing punch 21 is disposed inside the punching channel 22. The shearing punch 21 is coaxially arranged with the elastic anti-top component 11. The shearing punch 21 moves downward to punch the back of the pre-shearing recess 31 formed on the material plate 3 to form a valve plate. The elastic anti-top component 11 is configured to provide flexible buffering when the pre-shearing recess 31 is formed, and to abut against the pre-shearing recess 31 when punching the material plate to change the stress state of the material plate 3. Furthermore, without affecting the formation of the pre-shearing recess 31, it can provide a reverse lifting force when punching the material plate 3, so that the cut of the shearing punch 21 when punching the material plate 3 is smoother, thereby reducing the generation of burrs and rough surfaces.

[0064] The cross-sectional shapes of the punching channel 22 and the punching groove 121 can be customized according to the required valve plate shape, so that the cross-sectional shapes of the punching channel 22 and the punching groove 121 match the valve plate shape. Correspondingly, the shape of the shearing punch 21 is adapted to the shape of the punching channel 22, and the shape of the elastic anti-top component 11 is also adapted to the shape of the elastic anti-top component 11.

[0065] Continue reading Figure 1 The upper die mechanism 2 also includes a first telescopic drive component, a pressing assembly 24, and a guide assembly 25. The first telescopic drive component is not shown in this embodiment. In this embodiment, the first telescopic drive component can be a linear drive mechanism such as a hydraulic cylinder or a pneumatic cylinder. The shearing punch 21 is coaxially and fixedly connected to the drive shaft of the first telescopic drive component. The shearing punch 21 is directly driven by the first telescopic drive component to move within the punching channel 22 to complete the punching, ensuring the accuracy of the punched valve plate.

[0066] Please see Figure 1 and Figure 3 The elastic anti-top component 11 includes: a pressing drive rod 111, an elastic component 112, and a pressing head assembly 113. The pressing drive rod 111 slides against the inner wall of the punch groove 121, and one end of the pressing drive rod 111 is coaxially and fixedly connected to the drive shaft of the second telescopic drive component installed below. The second telescopic drive component is not shown in this embodiment. In this embodiment, the second telescopic drive component can be a linear drive mechanism such as a hydraulic cylinder or a pneumatic cylinder. One end of the elastic component 112 is mounted on the end face of the pressing drive rod 111, and the other end is connected to the pressing head assembly 113. The pressing drive rod 111 drives the pressing head assembly 113 to press the material plate 3 to form a pre-shearing recess 31. This method helps to reduce the burrs and rough surfaces generated by the valve plate during subsequent punching. At the same time, the elastic component 112 can continuously generate an anti-top force on the material plate 3 in the opposite direction to the movement direction of the shearing punch 21, thereby changing the stress state of the material plate 3 itself and reducing the possibility of crack formation.

[0067] Please see Figure 4 and Figure 5 The elastic component 112 includes a guide limiting member and an elastic component 1125. Two elastic components 1125 can be provided, respectively disposed on both sides of the guide limiting member. The two ends of the elastic component 1125 are respectively connected and fixed to the extrusion head assembly 113 and the extrusion drive rod 111. By providing the elastic component 1125, the elastic force generated by the elastic component 1125 not only buffers the contact impact but also provides preload force to the material plate 3. Simultaneously, during the subsequent punching stage of the material plate 3, the elastic force of the elastic component 1125 can continuously apply a reverse pushing force to the bottom of the material plate 3, effectively suppressing the propagation of shear cracks. In this embodiment, the elastic component 1125 can be a nitrogen spring or a disc spring. Figure 4 The elastic element 1125 shown is an example of a nitrogen spring.

[0068] Please see Figure 4 and Figure 5 The guide limiting component includes a guide tube 1121 and a guide segment 1122. The guide tube 1121 is a hollow cylindrical component. One end of the guide tube 1121 is fixedly mounted on the end face of the extrusion drive rod 111. One end of the guide segment 1122 is vertically fixed on the extrusion head assembly 113, and the other end extends into the guide tube 1121 and slides in cooperation with the guide tube 1121.

[0069] Please see Figure 6 Furthermore, the inner wall of the guide tube 1121 is provided with keyways 1123 distributed in the circumferential direction. The keyways 1123 extend along the length direction of the guide tube 1121. The outer circumferential direction of the guide segment 1122 is provided with a key bar 1124 that matches the keyways 1123. By providing keyways 1123 and key bars 1124 between the guide tube 1121 and the guide segment 1122, the elastic component 112 can be extended and retracted normally while the torsional resistance of the elastic component 112 is improved by limiting the movement of the keyways 1123 and key bars 1124.

[0070] Please continue reading. Figure 4 and Figure 5 The extrusion head assembly 113 includes an extrusion column 1131 and a threaded collar 1132. The extrusion column 1131 is threadedly connected to the threaded collar 1132, and the extrusion column 1131 has a T-shaped cross-section. An elastic element 1125 and a guide segment 1122 are both fixedly connected to one end face of the extrusion column 1131, and the threaded collar 1132 is sleeved on the outside of the extrusion column 1131. By rotating the threaded collar 1132, the distance between the threaded collar 1132 and the extrusion drive rod 111 can be adjusted in the natural state of the elastic element 1125. Therefore, the device can adjust the depth of the pre-shear recess 31 by adjusting the position of the threaded collar 1132.

[0071] Please continue reading. Figure 1 The guide assembly 25 includes guide posts 251 and sliding joints 252. Two guide posts 251 are provided, with one end of each guide post 251 positioned on either side of the shearing punch 21. Two sliding joints 252 are provided, with the other end of each guide post 251 penetrating the upper die 23. The sliding joints 252 are assembled inside the upper die 23 and sleeved outside the guide posts 251, slidably connected to the guide posts 251. By setting the guide posts 251 and sliding joints 252, the punching gap between the shearing punch 21 and the punching groove 121 of the lower die 12 remains constant, thereby ensuring the punching accuracy of the valve plate.

[0072] Please see Figure 1 and Figure 7The lower die mechanism 1 also includes a top plate assembly 13. The top plate assembly 13 includes a fixed seat 131 and a lifting seat 132. A placement groove is provided on the surface of the lower die 12. The fixed seat 131 is fixedly mounted on the inner wall of the bottom end of the placement groove. The lifting seat 132 is slidably mounted on the upper end of the fixed seat 131. A lifting elastic element is provided between the lifting seat 132 and the fixed seat 131. The upper end face of the lifting seat 132 protrudes from the surface of the lower die 12. By providing the top plate assembly 13 with the lifting elastic element 1125, after the punching is completed, the lifting seat 132 can lift the material plate 3 and suspend it above the surface of the lower die 12, thereby facilitating the movement of the material plate 3 for the next punching and ensuring work efficiency.

[0073] Please see Figure 8 Two sets of pressure components 24 are provided, respectively located on both sides of the punching channel 22. Each pressure component 24 includes a pressure drive 241 and a pressure rod 242. The upper die 23 has a vertically extending pressure channel inside. The pressure drive 241 is located at the upper end of the pressure channel, and the pressure rod 242 is located at the lower end of the pressure channel and is connected and fixed to the drive shaft of the pressure drive 241. During punching, the pressure components 24 can press the material plate 3 firmly against the surface of the lower die 12, preventing displacement of the material plate during punching and further ensuring punching accuracy. In this embodiment, the pressure drive 241 can be a pneumatic cylinder or a hydraulic cylinder.

[0074] In this specific embodiment, a valve plate punching process is also provided. When preparing valve plates using valve plate punching dies, the depth H of the pre-shearing recess 31 can be preset according to the thickness of the material plate, so that the depth H of the pre-shearing recess 31 is 20%-25% of the thickness of the material plate. Specifically, the distance D between the lower end of the threaded collar 1132 and the extrusion drive rod 111 can be adjusted by rotating the threaded collar 1132, so that the driving stroke L of the second telescopic drive member satisfies L=D+H.

[0075] Main combination Figure 1 , Figure 4 and Figure 5As can be seen, after mold opening, the material plate 3 is placed in the gap between the lower mold mechanism 1 and the upper mold mechanism 2, and then the mold is closed. After mold closing, the elastic anti-push assembly 11 is driven upward by controlling the second telescopic drive component. At this time, the upper end face of the extrusion column 1131 first contacts the lower surface of the material plate 3. Since the upper surface of the material plate 3 itself has a certain strength, and the lower mold mechanism 1 is at this time abutting against the upper surface of the material plate 3, the elastic element 1125 is compressed, and the threaded collar 1132 approaches the extrusion drive rod 111 until the threaded collar 1132 abuts against the upper surface of the extrusion drive rod 111. At this time, the entire elastic anti-push assembly 11 changes from an elastic component to a rigid component, and continues to drive the extrusion. The drive rod 111 moves upward, and the extrusion drive rod 111 drives the extrusion column 1131 to continuously extrude the material plate 3 until a preset pre-shearing depression 31 is formed. By using the second telescopic drive member to connect with the elastic anti-top assembly 11, the elastic assembly 112 and the extrusion head assembly 113 can complete a composite action of first flexible contact buffering and then rigid limiting extrusion, so as to perform complex stress control action under ordinary punching machine and form the above-mentioned pre-shearing depression 31, thereby helping to reduce the burrs and rough surfaces generated by the valve plate in the subsequent punching process.

[0076] After the pre-shearing recess 31 is formed, the second telescopic drive is controlled to reset. At this time, the extrusion drive rod 111 moves downward and the elastic element 1125 gradually returns to its natural state. When it returns to its natural state, the first telescopic drive is controlled to drive the shearing punch 21 downward. The shearing punch 21 contacts the back of the pre-shearing recess 31 and extends into the punch groove 121. At this time, the elastic element 1125 is compressed again under the impact of the shearing punch 21. As the shearing punch 21 continues to move, it continues until the part of the material plate 3 at the pre-shearing recess 31 is punched off to obtain the valve plate.

[0077] In this embodiment, Figure 9 This is a cross-sectional drawing of the valve plate after it has been punched using a conventional punching die. Figure 10 This is a cross-sectional view of a valve plate after it has been punched using a valve plate punching die, as provided in an embodiment of this application. Figure 9 and Figure 10 The method involves stacking multiple valve plates and then using an optical camera to uniformly inspect the cross-sections of the multiple valve plates.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A valve plate punching process, characterized in that, The invention includes a valve plate blanking die, the valve plate blanking die comprising: The lower die mechanism includes an elastic anti-push component that can move up and down and a lower die. The lower die has a vertically extending groove inside. The elastic anti-push component is disposed inside the groove. The elastic anti-push component moves upward to extrude the material plate to form a pre-shearing recess. The upper die mechanism includes a shearing punch that can move up and down and an upper die. The upper die has a punching channel coaxial with the punching groove inside. The shearing punch is disposed inside the punching channel and coaxial with the elastic anti-top component. The shearing punch moves down to punch the material plate on the back of the pre-sheared recess to form a valve plate. The elastic anti-top component is configured to provide flexible buffering during the formation of the pre-shear indentation; and, When punching the sheet metal, press against the pre-shearing recess to change the stress state of the sheet metal; The elastic anti-top assembly includes: a pressing drive rod, a second telescopic drive member is provided below the pressing drive rod, one end of the pressing drive rod is coaxially connected and fixed to the drive shaft of the second telescopic drive member, and the other end of the pressing drive rod extends into the punch groove and is slidably connected to the inner wall of the punch groove. An elastic component, one end of which is fixedly mounted on the other end of the extrusion drive rod, and the other end is equipped with an extrusion head assembly; The elastic component includes: A guide limiting component, comprising a guide tube and a guide segment, wherein one end of the guide tube is fixedly mounted on the other end face of the extrusion drive rod, and one end of the guide segment is fixedly connected to the extrusion head assembly, and the other end extends into the interior of the guide tube and is slidably connected to the guide tube; Two elastic elements are provided and are respectively disposed on both sides of the guide limiting member. The two ends of the elastic elements are respectively connected and fixed to the extrusion head assembly and the extrusion drive rod. The extrusion head assembly includes: The extrusion column has a threaded groove extending along its own length on its outer surface, and the elastic element and the guide joint are both connected and fixed to one end face of the extrusion column. A threaded collar, which is sleeved on the outside of the extrusion column and threadedly connected to the extrusion column; The valve plate punching process includes the following steps: Step 1: Adjust the valve plate punching die according to the characteristics of the material plate to preset the depth of the pre-shear indentation formed by the elastic anti-top component; Step 2: Open the mold and place the material plate, and close the mold to control the second telescopic drive to drive the elastic anti-top component to move upward, so as to squeeze the material plate and form a pre-shearing depression; Step 3: Control the second telescopic drive to reset, and control the first telescopic drive to drive the shearing punch to punch the back of the pre-sheared recess to obtain the valve plate; Step 4: Control the first telescopic drive component to reset, and the elastic anti-push component uses its own elastic force to push the valve plate out of the groove; Step 5: Recover the valve plate and move the material plate for the next punching operation.

2. The valve plate punching process according to claim 1, characterized in that: The upper die mechanism further includes a pressing assembly, of which two sets are provided, each set being disposed on both sides of the shearing punch. The pressing assembly includes: a pressing drive, wherein the upper die has a pressing channel extending vertically, and the pressing drive is disposed at the upper end of the pressing channel; and a pressing rod, which is connected and fixed to the drive shaft of the pressing drive and is disposed at the lower end of the pressing channel.

3. The valve plate punching process according to claim 1, characterized in that, The upper die mechanism further includes a guide assembly, which includes: two guide posts, one end of each guide post being disposed on both sides of the shearing punch; and two sliding joints, the other end of each guide post penetrating the upper die, the sliding joints being assembled inside the upper die and sleeved on the outside of the guide posts, and the sliding joints being slidably connected to the guide posts.

4. The valve plate punching process according to claim 1, characterized in that: The inner wall of the guide tube is provided with circumferentially distributed keyways, which extend along the length of the guide tube. The outer circumferential of the guide section is provided with key bars that are adapted to the keyways.

5. The valve plate punching process according to claim 4, characterized in that, The elastic element is a nitrogen spring.

6. The valve plate punching process according to claim 1, characterized in that, The lower mold mechanism further includes a top plate assembly, which includes: a fixed seat, wherein a placement groove is provided on the surface of the lower mold, and the fixed seat is fixedly assembled to the bottom inner wall of the placement groove; and a lifting seat, wherein the lifting seat is slidably assembled to the upper end of the fixed seat, and a lifting elastic element is provided between the lifting seat and the fixed seat, and the upper end face of the lifting seat protrudes from the surface of the lower mold.

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