Valve plate blanking die and blanking process

Abstract

The invention relates to a valve plate blanking die and a blanking process, and belongs to the technical field of metal stamping, the valve plate blanking die comprises a lower die mechanism and an upper die mechanism, the lower die mechanism comprises an elastic reverse jacking assembly capable of moving up and down and a lower die, a stamping groove extending in the vertical direction is formed in the lower die, and the elastic reverse jacking assembly is arranged in the stamping groove; the upper die mechanism comprises a shearing punch capable of moving up and down and an upper die, a blanking channel coaxial with the punching groove is formed in the upper die, and the shearing punch is arranged in the blanking channel and is coaxial with the elastic reverse jacking assembly. And the shearing punch moves downwards to punch the material plate on the back surface of the pre-shearing recess, so that the valve plate is formed. Through the arrangement of the telescopic elastic reverse jacking assembly, reverse jacking force can be provided during blanking of a material plate while formation of a pre-shearing recess is not affected, so that a notch of the shearing punch is smoother during blanking of the material plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping metal, in particular to a valve plate blanking die and a blanking process. BACKGROUND

[0002] The stamping die is widely used in valve plate manufacturing, and the valve plate is usually formed by stamping and shearing of a steel strip. The section quality directly affects the working performance and service life of the valve plate. The traditional single-step shearing process, i.e. the direct action of the upper die and the lower die, completes the complete shearing of the steel strip at one time. The principle is simple and the cost is low, but the section quality is easily affected by factors such as material plasticity and die gap.

[0003] A valve plate blanking die in the prior art comprises an upper die mechanism and a lower die mechanism. The upper die mechanism comprises an upper die seat, an upper back plate, an upper cushion plate and an upper clamp plate arranged in sequence from top to bottom. A plurality of limiting pieces for limiting the convex die knives mounted on the upper die seat are mounted on the lower part of the upper clamp plate. The lower die mechanism comprises a lower die seat. A plurality of support blocks are arranged on the bottom of the lower die seat. Adjacent two support blocks are equipped with material guiding pieces for guiding material. By arranging a plurality of convex die knives and limiting pieces matched with the convex die knives, a plurality of valve plates can be blanked at high speed, and the blanking efficiency can be improved.

[0004] In the above-mentioned and existing valve plate blanking die, when the material plate is blanked, the lower surface of the material plate is usually in a suspended state. When the material plate is blanked by the punch, it will be subjected to a large tensile stress, so that burrs and rough surfaces are generated on the edge of the material plate, and even cracks may occur on the material plate, resulting in a low yield rate. SUMMARY

[0005] The present application provides a valve plate blanking die, which can solve the problem that the existing valve plate blanking die may generate burrs on the edge of the valve plate when blanking the valve plate, and even cause cracks on the material plate.

[0006] The technical scheme of the present application is as follows: a valve plate blanking die, comprising: a lower die mechanism, the lower die mechanism comprising an elastically resilient counter-striking assembly and a lower die, the lower die having a vertically extending blanking groove formed therein, the elastically resilient counter-striking assembly being disposed within the blanking groove, the elastically resilient counter-striking assembly being upwardly movable to press a material plate to form a pre-shearing recess; an upper die mechanism, the upper die mechanism comprising a shearing punch and an upper die, the upper die having a blanking channel coaxial with the blanking groove formed therein, the shearing punch being disposed within the blanking channel and coaxially with the elastically resilient counter-striking assembly, the shearing punch being downwardly movable to blank the material plate on a back surface of the pre-shearing recess to form a valve plate; the elastically resilient counter-striking assembly being configured to perform flexible buffering when the pre-shearing recess is formed; and, When the blank is punched, the pre-shear recess is pressed against to change the stress state of the blank.

[0007] By adopting the above scheme, by setting the retractable elastic counter-thrust assembly, the device is capable of extruding the blank, and due to the strength of the blank itself, the elastic counter-thrust assembly is retracted, the elastic member becomes a rigid member, after becoming the rigid member, the blank is continuously extruded to form the pre-shear recess, and the process of changing the elastic counter-thrust assembly from the elastic to the rigid, i.e. the retraction process, can also slow down the reaction impact of the blank, and the formation of the pre-shear recess can also change the stress distribution of the blank itself, so that the stress concentration point is formed in advance when the blank is punched subsequently, and the occurrence of cracks during punching is reduced. In addition, the elastic counter-thrust assembly can counter-thrust the blank at the pre-shear recess when the device is punching, so that the tensile stress of the blank is changed to three-way compressive stress, the ductility of the blank itself is improved, and the incision of the shear punch when punching the blank is smoother.

[0008] In an embodiment of the present application, the upper die mechanism further comprises a blank pressing assembly, the blank pressing assembly is provided in two groups, and the two groups of blank pressing assemblies are respectively arranged on both sides of the shear punch, the blank pressing assembly comprises: A blank pressing driving member, a blank pressing channel extending in the vertical direction is formed in the inside of the upper die, and the blank pressing driving member is arranged at the upper end inside the blank pressing channel; A blank pressing rod, the blank pressing rod is connected and fixed with the driving shaft of the blank pressing driving member and is arranged at the lower end inside the blank pressing channel.

[0009] By adopting the above scheme, by arranging the blank pressing assembly on both sides of the punching channel and cooperating with the independently controlled blank pressing driving member, the blank can be pressed tightly on the surface of the lower die before the elastic counter-thrust assembly acts, so that the arching or displacement of the blank due to the extrusion of the bottom is prevented, and a stable boundary constraint is provided for subsequent pre-shear, so that the pre-shear recess and the downward shear punch are coaxially aligned.

[0010] In an embodiment of the present application, the upper die mechanism further comprises a guide assembly, the guide assembly comprises: A guide column, the guide column is provided in two, and one end of the two guide columns is respectively arranged on both sides of the shear punch; A sliding joint, the sliding joint is provided in two, the other end of the guide column penetrates through the upper die, the sliding joint is assembled inside the upper die and is sleeved outside the guide column, and the sliding joint is in sliding connection with the guide column.

[0011] By adopting the above scheme, the shearing punch and the lower die punch groove are kept constant by setting the guide column and the sliding joint, thereby ensuring the shearing accuracy of the valve plate.

[0012] In one embodiment of the present application, the elastic counter-thrust assembly comprises: The extrusion driving rod is provided below with a second telescopic driving member, one end of the extrusion driving rod is coaxially connected and fixed with a driving shaft of the second telescopic driving member, and the other end of the extrusion driving rod extends into the inside of the punch groove and is slidingly connected with the inner wall of the punch groove. The elastic assembly is fixedly assembled at one end of the extrusion driving rod and is provided at the other end with an extrusion head assembly.

[0013] By adopting the above scheme, the displacement input by the second telescopic driving member is converted into the composite action of the flexible contact buffer and the rigid limit extrusion by the elastic assembly and the extrusion head, so that the complex stress regulation action can be completed under the ordinary punch, and the subsequent maintenance and debugging are facilitated.

[0014] In one embodiment of the present application, the elastic assembly comprises: The guide limiting member comprises a guide tube and a guide joint body, one end of the guide tube is fixedly assembled on the other end face of the extrusion driving rod, one end of the guide joint body is fixedly connected on the extrusion head assembly, and the other end extends into the inside of the guide tube and is slidingly connected with the guide tube. The elastic member is provided with two and is arranged on both sides of the guide limiting member, and both ends of the elastic member are fixedly connected with the extrusion head assembly and the extrusion driving rod.

[0015] By adopting the above technical scheme, when the valve plate is extruded to form a pre-shearing recess, the extrusion head assembly is first compressed, the guide tube and the guide joint body slide relative to each other, and the elastic force generated by the compressed elastic member not only buffers the contact impact, but also provides a pre-tightening force for the material plate.

[0016] In one embodiment of the present application, the guide tube inner wall is provided with a circumferentially distributed key groove, the key groove extends along the length direction of the guide tube, and the guide joint body is provided on the outside with a key strip matched with the key groove.

[0017] By adopting the above scheme, the key groove and the key strip are arranged between the guide pipe and the guide joint body, so that the guide pipe and the guide joint body can perform axial telescopic movement while the circumferential displacement of the two is limited, and the torsional resistance of the elastic assembly is improved.

[0018] In one embodiment of the present application, the extrusion head assembly comprises: An extrusion column is externally provided with a threaded groove extending along the length direction of the extrusion column, and the elastic member and the guide joint body are both fixedly connected with the end face of the extrusion column; A threaded sleeve ring is sleeved on the outside of the extrusion column and is threadedly connected with the extrusion column.

[0019] By adopting the above scheme, when the extrusion column extrudes the material plate, the guide limiting member retracts and makes the threaded sleeve ring close to the extrusion driving rod. During the closing process, the elasticity of the elastic member can effectively buffer the contact impact suffered by the extrusion driving rod, until the threaded sleeve ring and the extrusion driving rod slide to abut against each other. At this time, the entire elastic counter-top assembly changes from flexible to rigid, and continuously extrudes the material plate to form a pre-shear recess. Meanwhile, when it is necessary to adjust the depth of the pre-shear recess according to the thickness of the material plate, the threaded sleeve ring is rotated to adjust the distance between the threaded sleeve ring and the extrusion driving rod in the natural state of the elastic member, so that the device can adjust the depth of the pre-shear recess by adjusting the position of the threaded sleeve ring without changing the total stroke of the second telescopic driving member.

[0020] In one embodiment of the present application, the elastic member is a nitrogen spring.

[0021] In one embodiment of the present application, the lower die mechanism further comprises a top plate assembly, which comprises: A fixed seat is fixedly assembled in the bottom end inner wall of the placement groove. A jacking seat is slidingly assembled in the upper end of the fixed seat, and a jacking elastic member is arranged between the jacking seat and the fixed seat, and the upper end face of the jacking seat protrudes from the lower die surface.

[0022] By adopting the above scheme, by arranging the top plate assembly with the jacking elastic member, after the blanking is completed, the jacking seat lifts up the material plate under the action of the jacking elastic member and suspends the material plate above the lower die surface, so that the feeding mechanism can quickly move the material plate for the next blanking, and the jacking elastic member can also assist in pressing the material plate during the die closing.

[0023] The second purpose of the present application is to provide a valve plate blanking process.

[0024] The technical scheme is as follows: a valve disc blanking process uses a valve disc blanking die to prepare a valve disc, and comprises the following steps: Step one: according to the characteristics of the material plate, adjust the valve disc blanking die to preset the depth of the pre-shear recess formed by the elastic counter-thrust assembly extrusion; Step two: open the mold, place the material plate, and close the mold to control the second telescopic drive to drive the elastic counter-thrust assembly to go up to extrude the material plate and form a pre-shear recess; Step three: control the second telescopic drive to reset, and control the first telescopic drive to drive the shear punch to blank the back of the pre-shear recess to obtain the valve disc; Step four: control the first telescopic drive to reset, and the elastic counter-thrust assembly uses its own elastic force to eject the valve disc from the punching groove; Step five, recycle the valve disc and move the material plate to perform the next blanking action.

[0025] By adopting the above scheme, the device first extrudes a pre-shear recess on the material plate before blanking according to the thickness of the material plate, changes the stress distribution of the material plate, reduces the possibility of burr formation when the material plate is blanked, and also adjusts the depth of the pre-shear recess according to different material thicknesses and materials through the threaded sleeve ring, so that the device can conveniently and efficiently adjust the depth of the pre-shear recess.

[0026] In summary, the present application has at least one of the following beneficial technical effects: by providing the elastic counter-thrust assembly, the initial stage of the extrusion stage in the valve disc blanking process uses the elastic component's idle stroke to achieve flexible buffering, avoiding the rigid impact of the hard alloy punch on the high-hardness material plate, and at the end of the extrusion, the rigid limit is realized by the resistance of the threaded sleeve ring and the extrusion drive rod, so that the material plate is pre-plastically deformed, and then the material plate can be pre-stressed at the internal stress concentration point before being blanked, thereby reducing the possibility of burr formation.

[0027] By setting the stroke compensation structure composed of the threaded sleeve ring, the extrusion column and the guide limiting piece, the device can change the stroke of the elastic component compression stage by rotating the position of the threaded sleeve ring, thereby adjusting the depth of the pre-shear recess while keeping the stroke of the second telescopic drive constant, which is more convenient and efficient, and can also adjust and compensate according to the error of the servo press or complex hydraulic control system to ensure accuracy.

[0028] By setting the coaxial elastic counter-thrust assembly below the shear punch, the elastic counter-thrust assembly in the compressed state can actively apply hydrostatic pressure to the material plate shear surface during the extrusion stage, thereby changing the stress state of the material plate shear zone from a combined stress of tension and shear to a three-way compression stress state, thereby improving the ductility of the material plate and further reducing the burrs and tear layers of the valve disc. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a front view of a valve plate blanking die provided in an embodiment of the present application; Figure 2 is a front view of a valve plate blanking die elastic counter-striking assembly extruding a material plate in an embodiment of the present application; Figure 3 is a perspective view of a valve plate blanking die elastic counter-striking assembly in an embodiment of the present application; Figure 4 is a front view of a valve plate blanking die elastic member in a natural state in an embodiment of the present application; Figure 5 is a front view of a valve plate blanking die elastic member in a compressed state in an embodiment of the present application; Figure 6 is a top view of a valve plate blanking die guide limiting member key groove in an embodiment of the present application; Figure 7 is a perspective view of a valve plate blanking die top plate assembly in an embodiment of the present application; Figure 8 is a perspective view of a valve plate blanking die pressure material assembly in an embodiment of the present application; Figure 9 is a cross-sectional physical diagram of a valve plate after being punched by using a conventional blanking die; Figure 10 is a cross-sectional physical diagram of a valve plate after being punched by a valve plate blanking die provided in an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 1, lower die mechanism; 11, elastic counter-striking assembly; 111, extrusion driving rod; 112, elastic assembly; 1121, guide tube; 1122, guide joint body; 1123, key groove; 1124, key bar; 1125, elastic member; 113, extrusion head assembly; 1131, extrusion column; 1132, threaded sleeve ring; 12, lower die; 121, punching groove; 13, top plate assembly; 131, fixed seat; 132, jacking seat; 2, upper die mechanism; 21, shearing punch; 22, blanking channel; 23, upper die; 24, pressure material assembly; 241, pressure material driving member; 242, pressure material rod; 25, guide assembly; 251, guide column; 252, sliding joint; 3, material plate; 31, pre-shearing recess. DETAILED DESCRIPTION

[0031] The following will be described in detail below with reference to the accompanying drawings Figures 1-10 A valve plate blanking die and a blanking process provided in the present application will be described in further detail, in which, in order to clearly show the positions of various components inside the lower die mechanism 1 and the upper die mechanism 2, Figure 1This is a cross-sectional view showing only the upper mold 23 and the lower mold 12.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please see Figure 1 and Figure 3The 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.

[0036] 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.

[0037] 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.

[0038] Please see Figure 6Furthermore, 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.

[0039] 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.

[0040] 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.

[0041] Please see Figure 1 and Figure 7 The 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.

[0042] 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.

[0043] 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.

[0044] Main combination Figure 1 , Figure 4 and Figure 5 As 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.

[0045] 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.

[0046] 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.

[0047] 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 die, characterized in that, include: 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 when the pre-shear indentation is formed; as well as, During the blanking process, the pre-shearing recess is pressed against to change the stress state of the blank.

2. The valve plate punching die according to claim 1, characterized in that: The upper die mechanism further includes a blanking assembly, of which two sets are provided, each set being disposed on both sides of the shearing punch. The blanking assembly includes: 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; 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.

3. The valve plate punching die according to claim 1, characterized in that, The upper mold mechanism further includes a guide assembly, which includes: Guide posts, two guide posts are provided, with one end of each guide post respectively located on both sides of the shearing punch; 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.

4. A valve plate punching die according to claim 1, characterized in that, The elastic anti-top component includes: 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. 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.

5. A valve plate punching die according to claim 4, characterized in that, 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.

6. A valve plate punching die according to claim 5, 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.

7. A valve plate punching die according to claim 4, characterized in that, 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 is fitted over the outside of the extrusion column and is threadedly connected to the extrusion column.

8. A valve plate punching die according to any one of claims 4-7, characterized in that, The elastic element is a nitrogen spring.

9. A valve plate punching die according to claim 1, characterized in that, The lower mold mechanism further includes a top plate assembly, the top plate assembly comprising: 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; 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.

10. A valve plate punching process, characterized in that: The valve sheet is prepared using a valve sheet punching die as described in any one of claims 1-9, comprising 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.

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