Punching die for workpiece

Abstract

The invention relates to the technical field of punching devices, and provides a punching die for workpieces, which comprises a fixed die assembly, a fixed die assembly, a fixed die assembly and a movable die assembly, the movable mold assembly is movably matched with the fixed mold assembly, and a driving piece is arranged on the movable mold assembly; the punching assembly is provided with a first cutter and a second cutter which are connected to the movable die assembly, the side, facing the fixed die assembly, of the second cutter is provided with a cutting edge, and an included angle is formed between the plane formed by the cutting edge and the plane, needing to be punched, of the workpiece. Compared with the prior art, by arranging the second cutter and the first cutter which are used for punching the workpiece in sequence, the counter-acting force generated by the workpiece to the cutters in the punching process is reduced, and therefore abrasion of cutter blades is relieved, in addition, the certain included angle is formed between the cutting edge of the second cutter and the plane, needing to be punched, of the workpiece, and the cutting efficiency is improved. When the second cutter cuts the workpiece, the contact point between the cutting edge and the workpiece is gradually changed, and abrasion of the cutting edge of the second cutter is further delayed.

Description

Technical Field

[0001] The invention relates to the technical field of punching devices, in particular to a punching die for a workpiece. Background Art

[0002] High-strength plates, especially those used for automotive parts, usually need to be punched or cut after forming to produce the desired groove structure or to achieve fixed-length cutting of the workpiece.

[0003] Existing punching dies (such as Figure 1 ) is usually equipped with a cutter 1 for punching or cutting a high-strength plate 3. Figure 1 When the cutting tool 1 moves from top to bottom, its cutting edge 2 contacts and cuts the high-strength plate 3. However, in the design of this die, the cutting edge 2 of the cutter 1 always contacts and cuts at the same position on the high-strength plate 3 during the entire cutting process, which easily leads to rapid wear of the cutting edge 2, thereby significantly shortening the service life of the cutting die. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a punching die for a workpiece in view of the current status of the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a punching die for a workpiece is proposed, comprising: a fixed die assembly, on which a positioning seat is arranged, and the positioning seat is used to position the workpiece to be punched; A movable mold assembly, which is movably matched with the fixed mold assembly, the movable mold assembly is provided with a driving member, and the movable mold assembly is used to drive the driving member to move relative to the fixed mold assembly; A punching assembly, comprising a first cutter connected to the movable die assembly, and a second cutter movably arranged on the side of the fixed die assembly, wherein the driving member is used to drive the second cutter to move relative to the positioning seat, and the second cutter is provided with a blade on a side facing the fixed die assembly, wherein a plane formed by the blade is arranged at an angle to a plane of the workpiece to be punched, so that the contact position between the blade and the workpiece is gradually changed during the process of the second cutter punching the workpiece; When the movable mold assembly moves toward the fixed mold assembly, the punching mold at least includes a first punching stroke, a reset stroke, and a second punching stroke performed sequentially; When in the first punching stroke, the driving member movably abuts against the second cutter and pushes the second cutter to punch the workpiece; When in the reset stroke, the driving member is out of contact with the second cutter, and the second cutter is away from the workpiece and resets; When in the second punching stroke, the fixed die assembly drives the first cutter to punch the workpiece.

[0006] In the above-mentioned punching die for workpieces, the punching assembly includes two second cutters symmetrically arranged on the fixed mold assembly, the first cutter and the two second cutters together form a punching portion, and the area of ​​the punching portion is larger than the area of ​​the cross-section formed after the workpiece is punched.

[0007] In the above-mentioned punching die for workpieces, the end of the second cutter away from the positioning seat is provided with a first inclined surface facing the driving member, and the driving member is provided with a second inclined surface and a first avoidance surface; When in the first punching stroke, the second inclined surface movably abuts against the first inclined surface to push the second cutter to move on the fixed die assembly; When in the reset stroke, the second inclined surface passes over the first inclined surface, the second cutter is reset, and the first avoidance surface provides a moving space for the reset of the second cutter.

[0008] In the above-mentioned punching die for workpieces, the punching assembly also includes a base, the base is fixed on the fixed die assembly, an extension portion is provided on the base, a mounting hole is provided on the second cutter, an elastic member is provided in the mounting hole, one end of the elastic member is tightly against the extension portion, and the other end is tightly against the bottom wall of the mounting hole, so as to drive the second cutter to reset.

[0009] In the above-mentioned punching die for workpieces, a first guide portion and a second guide portion are provided on the base, and a third guide portion is provided on the second cutter. The first guide portion is slidably matched with the outer side wall of the second cutter, and the second guide portion and the third guide portion are movably abutted against each other to provide guidance for the movement of the second cutter.

[0010] In the above-mentioned punching die for workpieces, the second cutter includes a cutter body and a cutter seat, the cutter body and the cutter seat are detachably connected, a support frame is provided on the fixed mold assembly, a first limit block is provided on the support frame, the cutter seat and the first limit block are movably abutted against each other to provide a limit for the movement of the second cutter.

[0011] In the above-mentioned punching die for workpieces, an extension block is provided on the outer side wall of the tool holder, and a third inclined surface facing the movable die assembly is provided on the extension block, and a driving block is provided on the movable die assembly, and a fourth inclined surface is provided on the driving block; When in the reset stroke, the third inclined surface movably abuts against the fourth inclined surface to push the second cutter to reset.

[0012] In the above-mentioned punching die for workpieces, the knife seat is tiltedly arranged on the fixed die assembly and has a second avoidance surface; When in the first punching stroke, the second avoidance surface is used to provide an avoidance space for the movement of the driving member.

[0013] In the above-mentioned punching die for workpieces, a support column is provided on the fixed die assembly, a second limit block is provided on the support column, a limit slot is provided on the tool holder, and the second limit block movably abuts against the limit slot to provide a limit for the resetting of the second cutter.

[0014] In the above-mentioned punching die for a workpiece, the movable die assembly comprises: Dynamic template; A mounting seat connected to the movable platen, and the first cutter is connected to the mounting seat; a nitrogen spring connected to the mounting seat; A pressing plate is connected to the end of the mounting base away from the movable platen through a connecting column and is connected to the output end of the nitrogen spring, so as to press on the workpiece before the punching assembly punches the workpiece.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) By setting up a second cutter and a first cutter to punch the workpiece in sequence, the reaction force generated by the workpiece on the cutter during the punching process is reduced, thereby slowing down the wear of the cutter blade. In addition, the blade of the second cutter is set at a certain angle to the plane of the workpiece to be punched, so that when the second cutter cuts the workpiece, the contact point between the blade and the workpiece gradually changes, further delaying the wear of the second cutter blade;

[0017] (2) By providing two symmetrical second cutters, and making the punching area enclosed by the first cutter and the two second cutters larger than the end surface area formed after the workpiece is cut, it is ensured that the workpiece can be cut accurately and completely;

[0018] (3) a first inclined surface is provided on the second cutter, and a second inclined surface slidably matched with the first inclined surface is provided on the driving member, so as to realize the function of the driving member pushing the second cutter;

[0019] (4) An extension portion is provided on the base, and a mounting hole with an elastic member is provided on the second cutter, so that the second cutter can be automatically reset by utilizing the restoring force of the elastic member;

[0020] (5) A driving block is provided on the movable mold assembly, and an extension block is provided on the knife seat of the second cutter, so that the inclined surfaces on the two cooperate with each other. When the elastic member fails, the driving block pushes the second cutter to reset, thereby ensuring the normal operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial view of a conventional punching die;

[0022] Figure 2 is a stereoscopic diagram of a punching die for a workpiece according to the present invention;

[0023] Figure 3 yes Figure 2 A three-dimensional diagram of the structure of the middle part;

[0024] Figure 4 is a three-dimensional diagram of the first cutter installed on the movable mold assembly;

[0025] Figure 5 It is a three-dimensional diagram of the structure of the punching assembly installed on the fixed die assembly;

[0026] Figure 6 It is a three-dimensional diagram of the partial structure of the punching assembly;

[0027] Figure 7 yes Figure 6 A cross-sectional view of

[0028] Figure 8 is a three-dimensional view of the driving member and the second cutter when they are in abutment;

[0029] Fig. 9 This is a three-dimensional diagram of the drive block and the second cutter when connected.

[0030] In the figure, 1, cutting knife; 2, cutting edge; 3, high-strength plate;

[0031] 100, fixed mold assembly; 110, positioning seat; 120, positioning pin; 130, support frame; 140, first limit block; 150, support column; 160, second limit block; 200, movable mold assembly; 210, driving member; 211, second inclined surface; 212, first avoidance surface; 220, movable mold plate; 230, mounting seat; 240, nitrogen spring; 250, pressure plate; 260, driving block; 261, fourth inclined surface; 300, punching assembly ; 310, first cutter; 320, second cutter; 321, blade; 322, first inclined plane; 323, mounting hole; 324, third guide portion; 325, cutter body; 326, cutter seat; 326a, second avoidance surface; 326b, limiting groove; 327, extension block; 327a, third inclined plane; 340, angle; 350, base; 351, extension portion; 352, first guide portion; 353, second guide portion; 360, elastic member. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] A punching die for a workpiece includes a fixed die assembly 100, a movable die assembly 200, and a punching assembly 300.

[0034] Specifically, a positioning seat 110 is provided on the fixed die assembly 100, and the positioning seat 110 is used to position the workpiece to be punched; The movable mold assembly 200 is movably matched with the fixed mold assembly 100. The movable mold assembly 200 is provided with a driving member 210, and the movable mold assembly 200 is used to drive the driving member 210 to move relative to the fixed mold assembly 100; The punching assembly 300 comprises a first cutter 310 connected to the movable mold assembly 200, and a second cutter 320 movably arranged on the side of the fixed mold assembly 100. The driving member 210 is used to drive the second cutter 320 to move relative to the positioning seat 110. The second cutter 320 is provided with a blade 321 on the side facing the fixed mold assembly 100. The plane formed by the blade 321 is arranged at an angle 340 with the plane of the workpiece to be punched, so that the contact position between the blade 321 and the workpiece is gradually changed during the process of the second cutter 320 punching the workpiece. When the movable mold assembly 200 moves toward the fixed mold assembly 100, the punching mold at least includes a first punching stroke, a reset stroke, and a second punching stroke performed in sequence; When in the first punching stroke, the driving member 210 and the second cutter 320 are movably abutted against each other and push the second cutter 320 to punch the workpiece; When in the reset stroke, the driving member 210 is out of contact with the second cutter 320, and the second cutter 320 is away from the workpiece and reset; When in the second punching stroke, the fixed die assembly 100 drives the first cutter 310 to punch the workpiece.

[0035] Based on the above embodiments, an exemplary structure of the present invention is as follows: Figures 2 to 9 As shown. Among them, the punching assembly 300, the positioning seat 110, the driving member 210, the first cutter 310 and the second cutter 320 can be provided in two or more sets, which are used to cut multiple workpieces at the same time, so as to improve the processing efficiency. Of course, these components can also be provided in only one set, so that only one workpiece is processed in one punching operation. If the size of the punching equipment allows, three or more sets of components can be provided to further increase the number of workpieces that can be processed in each operation.

[0036] When the workpiece is a shell-like part, the design of the positioning seat 110 matches the internal structure of the workpiece, that is, the positioning seat 110 has a shape similar to the inner cavity of the workpiece to ensure accurate positioning of the workpiece. If the workpiece lacks an internal structure suitable for matching with the positioning seat 110, the positioning seat 110 can adapt to the external shape of the workpiece by providing a groove-like structure to achieve positioning of the workpiece. In one embodiment, if a hole-like structure is provided on the workpiece, the positioning seat 110 is correspondingly provided with a positioning pin 120 to provide more accurate positioning.

[0037] The movable cooperation between the movable mold assembly 200 and the fixed mold assembly 100 is realized by a punching device (such as a hydraulic press or a punching machine). During installation, the fixed mold assembly 100 is connected to the fixed part of the punching device, and the movable mold assembly 200 is connected to its movable part. The movable part of the punching device drives the movable mold assembly 200 to move closer to or away from the fixed mold assembly 100, thereby completing the closing and opening process of the punching die.

[0038] The working process of this scheme is as follows: after the workpiece is placed and fixed on the positioning seat 110, the punching device drives the movable mold assembly 200 to move toward the fixed mold assembly 100. In this process, the first cutter 310 and the driving member 210 move together with the movable mold assembly 200. When the driving member 210 begins to contact the second cutter 320, the punching die enters the first punching stroke, at which time the driving member 210 pushes the second cutter 320 to approach the workpiece and starts the preliminary cutting of the workpiece. While the second cutter 320 is performing cutting, the first cutter 310 continues to move toward the fixed mold assembly 100 with the movable mold assembly 200. After the cutting of the second cutter 320 is completed, the driving member 210 separates from the second cutter 320, the second cutter 320 returns to its initial position, and the punching die enters the reset stroke. Subsequently, the first cutter 310 begins to perform the final cutting of the workpiece, and the punching die enters the second punching stroke. After completing the entire cutting operation, the punching device moves the movable mold assembly 200 in the opposite direction to reset it.

[0039] In order to reduce the problem of easy wear of the cutter during the cutting process in the prior art, this solution makes two key improvements to the punching die: First, by introducing the first cutter 310 and the second cutter 320, a two-stage cutting strategy is adopted during the cutting process: first, the second cutter 320 is used to perform preliminary cutting on the workpiece to destroy the overall rigidity of the workpiece; and then the first cutter 310 is used to complete the final cutting. This method reduces the reaction force acting on the cutter during each cutting, especially reduces the maximum reaction force borne by the blade 321, thereby extending the service life of the blade 321.

[0040] Second, the plane of the blade 321 of the second cutter 320 is set at a certain angle to the plane of the workpiece to be cut. In this way, during the process of the second cutter 320 cutting the workpiece, the contact point between the blade 321 and the workpiece will gradually change with the cutting action. For example, referring to Figure 3 , because there is an angle 340 between the plane of the blade 321 and the cutting surface of the workpiece, when the second cutter 320 moves along the lower left side, the lower part of the blade 321 first contacts the workpiece and starts cutting, and as the cutting process progresses, the contact point moves upward along the plane of the blade 321. This means that the portion of the blade 321 that initially contacts the workpiece will not participate in the subsequent cutting process, avoiding the situation where a specific point of the blade 321 is continuously subjected to force during the entire cutting process, thereby slowing down the wear of the blade 321 of the second cutter 320 and increasing its service life.

[0041] The first cutter 310 and the second cutter 320 can be used to perform a notching operation on the workpiece, and can also be used for a cutting operation. Preferably, when performing a cutting operation, the punching assembly 300 includes two second cutters 320 symmetrically arranged on the fixed die assembly 100. The first cutter 310 and the two second cutters 320 together enclose a punching area, the area of ​​which is larger than the cross-sectional area formed after the workpiece is cut, so as to ensure that after completing a first punching stroke and a second punching stroke, the workpiece can be effectively and completely cut off.

[0042] Reference Figure 2 , Figure 3 and Figure 8 The end of the second cutter 320 away from the positioning seat 110 is provided with a first inclined surface 322 facing the driving member 210, and the driving member 210 is provided with a second inclined surface 211 and a first avoidance surface 212; When in the first punching stroke, the second inclined surface 211 and the first inclined surface 322 are movably abutted against each other to push the second cutter 320 to move on the fixed mold assembly 100; When in the reset stroke, the second inclined surface 211 passes over the first inclined surface 322 , the second cutter 320 is reset, and the first avoidance surface 212 provides a moving space for the second cutter 320 to reset.

[0043] When the movable mold assembly 200 drives the driving member 210 to move toward the fixed mold assembly 100, so that the driving member 210 begins to contact the second cutter 320, the second inclined surface 211 on the driving member 210 begins to contact the first inclined surface 322 on the second cutter 320. At this time, the driving member 210 further moves toward the fixed mold assembly 100 under the continuous drive of the movable mold assembly 200. Due to the relative sliding between the first inclined surface 322 and the second inclined surface 211, the second cutter 320 is prompted to move toward the positioning seat 110, thereby performing a punching operation on the workpiece on the positioning seat 110. After completing the punching operation of the second cutter 320, as the driving member 210 continues to move toward the fixed mold assembly 100, the second inclined surface 211 passes over the first inclined surface 322, so that the driving member 210 no longer applies thrust to the second cutter 320, and the punching mold enters the reset stroke. At this time, the second cutter 320 begins to move in the reverse direction until it returns to the initial position. During the resetting process of the second cutter 320 , the first avoidance surface 212 effectively avoids the interference between the driving member 210 and the second cutter 320 , and provides sufficient space for the smooth resetting of the second cutter 320 .

[0044] The first avoidance surface 212 is preferably designed as a slope, so that after the workpiece punching operation is completed, when the movable mold assembly 200 drives the driving member 210 away from the fixed mold assembly 100, the first avoidance surface 212 can guide the second cutter 320 to move toward the positioning seat 110 during the movement of the driving member 210, thereby making space for the movement of the driving member 210.

[0045] The punching assembly 300 also includes a base 350, which is fixed on the fixed mold assembly 100. The base 350 is provided with an extension portion 351. The second cutter 320 is provided with a mounting hole 323. An elastic member 360 is provided in the mounting hole 323. One end of the elastic member 360 is pressed against the extension portion 351, and the other end is pressed against the bottom wall of the mounting hole 323, so as to drive the second cutter 320 to reset.

[0046] When the driving member 210 pushes the second cutter 320 toward the workpiece on the positioning seat 110 through the cooperation of the second inclined surface 211 and the first inclined surface 322, the second cutter 320 is also displaced relative to the base 350. During the movement of the second cutter 320, it squeezes the elastic member 360, causing the elastic member 360 to elastically deform and store energy. After the driving member 210 moves to the second inclined surface 211 over the first inclined surface 322, the driving member 210 no longer applies thrust to the second cutter 320. At this time, the elastic member 360 releases the stored elastic potential energy, pushing the second cutter 320 to move in the opposite direction until the second cutter 320 is reset to the initial position.

[0047] Preferably, the elastic member 360 is a spring.

[0048] Reference Figure 2 , Figure 6 and Figure 7 A first guide portion 352 and a second guide portion 353 are provided on the base 350, and a third guide portion 324 is provided on the second cutter 320. The first guide portion 352 is slidably matched with the outer wall of the second cutter 320, and the second guide portion 353 and the third guide portion 324 are movably abutted against each other to provide guidance for the movement of the second cutter 320.

[0049] When the driving member 210 pushes the second cutter 320 toward the workpiece on the positioning seat 110 through the cooperation between the second inclined surface 211 and the first inclined surface 322, or when the second cutter 320 is reset under the push of the elastic member 360, the first guide portion 352 maintains sliding contact with the outer side wall of the second cutter 320, and the second guide portion 353 and the third guide portion 324 respectively moveably abut against each other to provide guiding action for the inner and outer sides of the second cutter 320 at the same time, thereby ensuring the accuracy of the moving direction of the second cutter 320.

[0050] The second cutter 320 includes a cutter body 325 and a cutter seat 326, which are detachably connected. A support frame 130 is provided on the fixed mold assembly 100, and a first limit block 140 is provided on the support frame 130. The cutter seat 326 and the first limit block 140 are movably abutted against each other to provide a limit for the movement of the second cutter 320.

[0051] Although the present solution performs staged punching of the workpiece by setting the first cutter 310 and the second cutter 320, and sets the plane of the blade 321 of the second cutter 320 and the plane of the workpiece to be punched to form a certain angle 340, which effectively slows down the wear of the blade 321. However, as the punching operation continues, the wear of the second cutter 320 is still inevitable. For this reason, the second cutter 320 is designed as a detachable structure consisting of a cutter body 325 and a cutter seat 326 in the present solution, so as to facilitate the replacement of the worn cutter body 325. The detachable connection between the cutter body 325 and the cutter seat 326 can be achieved by setting a threaded hole on the cutter seat 326, setting a through hole on the cutter body 325, and then using a bolt to pass through the through hole on the cutter body 325 and threadedly connect with the threaded hole on the cutter seat 326.

[0052] In addition, in order to prevent the driver 210 from shaking during movement due to a malfunction of the punching device, thereby causing the second cutter 320 to move too long and squeeze other components (such as the positioning seat 110), causing damage to the second cutter 320 or the positioning seat 110, the present solution provides a first limit block 140. The limit block is mounted on the support frame 130 and is used to be fixed on the fixed mold assembly 100 to limit the maximum moving distance of the second cutter 320 and ensure safe operation.

[0053] An extension block 327 is disposed on the outer side wall of the knife seat 326, and a third inclined surface 327a facing the movable mold assembly 200 is disposed on the extension block 327. The movable mold assembly 200 is provided with a driving block 260, and a fourth inclined surface 261 is disposed on the driving block 260. When in the reset stroke, the third inclined surface 327 a movably abuts against the fourth inclined surface 261 to push the second cutter 320 to reset.

[0054] The extension block 327 is designed to provide emergency treatment when the second cutter 320 fails to complete the reset operation under the push of the elastic member 360 after the first punching stroke is completed. Specifically, when the first punching stroke is completed and the elastic member 360 fails and cannot drive the second cutter 320 to reset, the driving block 260 gradually approaches the extension block 327 during the movement of the movable mold assembly 200 toward the fixed mold assembly 100. Before the stamping die enters the second punching stroke, the fourth inclined surface 261 on the driving block 260 contacts and slides with the third inclined surface 327a on the extension block 327, thereby pushing the second cutter 320 to move away from the fixed mold assembly 100, thereby achieving the reset of the second cutter 320.

[0055] Of course, if the elastic member 360 has not failed, before the drive block 260 descends to the position to cooperate with the extension block 327, the second cutter 320 has been reset under the action of the elastic member 360, so that the extension block 327 and the drive block 260 are offset in the horizontal direction, so that the drive block 260 and the extension block 327 are not in contact at this time.

[0056] The knife seat 326 is tiltedly disposed on the fixed mold assembly 100 and has a second avoidance surface 326a; When in the first punching stroke, the second avoidance surface 326 a is used to provide an avoidance space for the movement of the driving member 210 .

[0057] The second avoidance surface 326a is used to prevent the driver 210 from interfering with the second cutter 320 before pushing the second cutter 320 when the driver 210 moves toward the fixed mold assembly 100, so as to ensure that the driver 210 can normally drive the second cutter 320 to move. If the knife holder 326 is arranged horizontally, before the movable mold assembly 200 drives the driver 210 to move toward the fixed mold assembly 100 until the driver 210 contacts the second cutter 320, the driver 210 is provided with a second inclined surface 211 for pushing the second cutter 320, which may cause a large interference between the driver 210 and the second cutter 320. At this time, the excess of the knife holder 326 is cut off in order to set the second avoidance surface 326a, which increases the difficulty of processing the second avoidance surface 326a. If the knife holder 326 is arranged obliquely, the thickness of the knife holder 326 material required to be cut off to set the second avoidance surface 326a can be significantly reduced, thereby simplifying the processing process.

[0058] The fixed mold assembly 100 is provided with a support column 150 , and the support column 150 is provided with a second limit block 160 . The knife seat 326 is provided with a limit slot 326 b , and the second limit block 160 movably abuts against the limit slot 326 b to provide a limit for the reset of the second cutter 320 .

[0059] Whether it is reset under the push of the elastic member 360 or reset under the cooperation of the driving block 260 and the extension block 327, the reset amount of the second cutter 320 cannot be too large, otherwise it will affect the reset of the driving member 210 after the punching operation is completed, and the normal execution of the next punching operation. The second limit block 160 and the limit groove 326b ensure that the second cutter 320 can accurately reset to the predetermined position, thereby ensuring the normal reset of the driving member 210 and ensuring that the punching die can continuously perform the punching operation.

[0060] The movable mold assembly 200 includes: a movable mold plate 220; a mounting seat 230, which is connected to the movable mold plate 220, and a first cutter 310 is connected to the mounting seat 230; a nitrogen spring 240, which is connected to the mounting seat 230; a pressing plate 250, which is connected to an end of the mounting seat 230 away from the movable mold plate 220 through a connecting column, and is connected to the output end of the nitrogen spring 240, for pressing on the workpiece before the punching assembly 300 punches the workpiece.

[0061] The movable platen 220 is used to connect the movable die assembly 200 with the active part of the punching equipment, and serves as a fixed base for the driving member 210 and the driving block 260. The mounting seat 230 is used to connect the nitrogen spring 240 and the first cutter 310 to the movable platen 220. Before the punching operation of the workpiece begins, the pressing plate 250 presses the surface of the workpiece under the action of the nitrogen spring 240 to prevent the workpiece from shaking during the punching process, thereby ensuring the punching quality of the workpiece. The connecting column and the pressing plate 250 are movably connected, which is not only used to connect the pressing plate 250 and the mounting seat 230, but also provides guidance for the movement of the pressing plate 250 when the nitrogen spring 240 drives the pressing plate 250 to move toward the mounting seat 230 to reset the pressing plate 250 after the punching operation of the workpiece is completed.

[0062] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0063] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A punching die for a workpiece, characterized in that: include: A fixed die assembly, on which a positioning seat is provided, and the positioning seat is used to position the workpiece to be punched; A movable mold assembly, which is movably matched with the fixed mold assembly, the movable mold assembly is provided with a driving member, and the movable mold assembly is used to drive the driving member to move relative to the fixed mold assembly; A punching assembly, comprising a first cutter connected to the movable die assembly, and a second cutter movably arranged on the side of the fixed die assembly, wherein the driving member is used to drive the second cutter to move relative to the positioning seat, and the second cutter is provided with a blade on a side facing the fixed die assembly, wherein a plane formed by the blade is arranged at an angle to a plane of the workpiece to be punched, so that the contact position between the blade and the workpiece is gradually changed during the process of the second cutter punching the workpiece; When the movable mold assembly moves toward the fixed mold assembly, the punching mold at least includes a first punching stroke, a reset stroke, and a second punching stroke performed sequentially; When in the first punching stroke, the driving member movably abuts against the second cutter and pushes the second cutter to punch the workpiece; When in the reset stroke, the driving member is out of contact with the second cutter, and the second cutter is away from the workpiece and resets; When in the second punching stroke, the fixed die assembly drives the first cutter to punch the workpiece.

2. A punching die for a workpiece as claimed in claim 1, characterized in that: The punching assembly includes two second cutters symmetrically arranged on the fixed mold assembly. The first cutter and the two second cutters together form a punching portion, and the area of ​​the punching portion is larger than the area of ​​the cross section formed after the workpiece is punched.

3. A punching die for a workpiece as claimed in claim 1, characterized in that: The end of the second cutter away from the positioning seat is provided with a first inclined surface facing the driving member, and the driving member is provided with a second inclined surface and a first avoidance surface; When in the first punching stroke, the second inclined surface movably abuts against the first inclined surface to push the second cutter to move on the fixed die assembly; When in the reset stroke, the second inclined surface passes over the first inclined surface, the second cutter is reset, and the first avoidance surface provides a moving space for the reset of the second cutter.

4. A punching die for a workpiece as claimed in claim 1, characterized in that: The punching assembly also includes a base, which is fixed on the fixed mold assembly. The base is provided with an extension portion. The second cutter is provided with a mounting hole. An elastic member is provided in the mounting hole. One end of the elastic member is tightly pressed against the extension portion, and the other end is tightly pressed against the bottom wall of the mounting hole, so as to drive the second cutter to reset.

5. A punching die for a workpiece as claimed in claim 4, characterized in that: The base is provided with a first guide portion and a second guide portion, the second cutter is provided with a third guide portion, the first guide portion is slidably matched with the outer side wall of the second cutter, and the second guide portion and the third guide portion are movably abutted against each other to provide guidance for the movement of the second cutter.

6. A punching die for a workpiece as claimed in claim 1, characterized in that: The second cutter includes a cutter body and a cutter seat, the cutter body and the cutter seat are detachably connected, a support frame is provided on the fixed mold assembly, a first limit block is provided on the support frame, the cutter seat and the first limit block are movably abutted against each other to provide a limit for the movement of the second cutter.

7. A punching die for a workpiece as claimed in claim 6, characterized in that: An extension block is provided on the outer side wall of the knife seat, and a third inclined surface facing the movable mold assembly is provided on the extension block. The movable mold assembly is provided with a driving block, and a fourth inclined surface is provided on the driving block. When in the reset stroke, the third inclined surface movably abuts against the fourth inclined surface to push the second cutter to reset.

8. A punching die for a workpiece as claimed in claim 7, characterized in that: The knife seat is tiltedly arranged on the fixed die assembly and has a second avoidance surface; When in the first punching stroke, the second avoidance surface is used to provide an avoidance space for the movement of the driving member.

9. A punching die for a workpiece as claimed in claim 6, characterized in that: The fixed mold assembly is provided with a support column, the support column is provided with a second limit block, the knife seat is provided with a limit slot, the second limit block movably abuts against the limit slot to provide a limit for resetting the second cutter.

10. A punching die for a workpiece according to claim 1, characterized in that: The movable mold assembly comprises: Dynamic template; A mounting seat connected to the movable platen, and the first cutter is connected to the mounting seat; a nitrogen spring connected to the mounting seat; A pressing plate is connected to the end of the mounting base away from the movable platen through a connecting column and is connected to the output end of the nitrogen spring, so as to press on the workpiece before the punching assembly punches the workpiece.

Images