Punching and shearing device

Abstract

The punching and shearing device comprises a punching and shearing assembly and a pressure-bearing assembly, the punching and shearing assembly comprises a positioning seat, a positioning column, a punching and shearing needle and a discharging block, the pressure-bearing assembly comprises a pressure-bearing block capable of moving up and down, the positioning column is detachably installed on the front side of the pressure-bearing block, a punching needle cavity is formed in the positioning column, and the punching and shearing needle is arranged in the punching and shearing assembly. The punching and shearing needle is detachably installed in the punching needle cavity, a positioning groove penetrating through the front end face and the rear end face of the positioning seat is formed in the positioning seat, the positioning column penetrates into the positioning groove, a containing cavity is formed in the positioning seat, the discharging block is detachably embedded in the containing cavity, and a vertical first discharging groove is formed in the discharging block. The punching and shearing device needs to be used in cooperation with any commonly-used pneumatic or hydraulic or electrically-driven punching machine, the punching and shearing requirements of pipes in different shapes and punching and forming requirements of different shapes and distances can be met through the modular assembling structure of the punching and shearing device, and different production process selections can be provided for the products in the frequent product updating state; the structure is simple, the assembly is convenient, and the manufacturing and maintenance cost can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of metal pipe processing technology, and in particular to a punching and shearing device. Background Technology

[0002] Punching and shearing is a processing technology highly suitable for manufacturing, boasting unique advantages such as high efficiency, high precision, and low cost, making it an indispensable processing method in modern manufacturing. Currently, shower products are trending towards thinner, more refined, and multifunctional designs, leading to increased demands on the processing of semi-finished shower hardware. Existing methods for machining holes in metal pipe fittings use a single die, limiting the pipe shape to circular and resulting in low accuracy when punching multiple holes at once. This also makes it prone to hole misalignment and pipe deformation. Such processing methods are no longer sufficient to meet the demands of thinner, more refined, and multifunctional shower products. Utility Model Content

[0003] This invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, this invention proposes a punching and shearing device that is applicable to punching and shearing of multiple shapes and multiple holes, reducing production difficulty and manufacturing costs, and providing diversified process options for product manufacturing.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] The punching and shearing device according to an embodiment of the present invention includes a punching and shearing assembly and a pressure-bearing assembly. The punching and shearing assembly includes a positioning seat, a positioning post, a punching and shearing needle, and a blanking block. The pressure-bearing assembly includes a pressure-bearing block that can move up and down. The positioning post is detachably mounted on the front side of the pressure-bearing block. A punching needle cavity is formed on the positioning post. The punching and shearing needle is detachably mounted in the punching needle cavity, and the head end of the punching and shearing needle extends downward through the positioning post. The positioning seat is located on the front side of the pressure-bearing block, and the positioning seat has a through-type end face. The positioning groove is provided, the positioning post is inserted into the positioning groove, and a gap is left between the inner peripheral wall of the positioning groove and the outer peripheral wall of the positioning post for the workpiece to be inserted. The positioning seat is provided with a receiving cavity, and the blanking block is detachably embedded in the receiving cavity. The blanking block is provided with a vertical first blanking groove, the upper end of the first blanking groove is connected to the positioning groove, and the cross-sectional shape of the upper part of the first blanking groove is adapted to the shape of the punching and shearing needle tip. The punching and shearing needle can move downward with the pressure block and extend into the first blanking groove.

[0006] The punching and shearing device according to the embodiments of this utility model has at least the following beneficial effects:

[0007] 1. This utility model adopts a detachable modular design, transforming the original dedicated mold into a production mode that allows for rapid switching between multiple products using the same mold. Different components within the device can be quickly replaced to achieve punching and shearing of pipes with different shapes and multiple holes. For example, changing the hole spacing allows for replacing the positioning pin and the blanking block; changing the shape and distance of the punching holes allows for replacing the punching needle, positioning pin, and blanking block; and changing the shape of the pipe fitting allows for replacing the positioning seat, positioning pin, and blanking block. The modular assembly structure of this punching and shearing device can meet the punching and shearing needs of pipes with different shapes and punching formations with different shapes and distances. Even with frequent product updates, it provides different production process options, effectively expanding the applicability of the punching and shearing device. At the same time, its simple structure and convenient assembly significantly reduce manufacturing and maintenance costs.

[0008] 2. The punching and shearing device of this utility model needs to be used with any commonly used pneumatic, hydraulic, or electric punching machine. It uses positioning grooves to fix the pipe fittings. The shapes of the positioning pins and positioning grooves are designed according to the shape of the pipe fittings to be punched and sheared. The pressure block, positioning pins, and punching and shearing needles are relatively fixed. When the punching machine presses down, it will drive the pressure block, positioning pins, and punching and shearing needles to press down synchronously to complete the punching and shearing of the pipe fittings. The pipe fittings will not shift or deform during the punching and shearing process, effectively ensuring that the accuracy of the punching and shearing device can be controlled after long-term use. The quality of the punching and shearing process is stable, the product defect rate is reduced, and the production efficiency is improved. It can be used immediately after installation, has low technical requirements for operators, and reduces training costs.

[0009] According to some embodiments of the present invention, a base plate assembly is also included. The base plate assembly includes a fixed base plate, a guide post, and a spring. The pressure block is located above the fixed base plate. The guide post is vertically installed on the fixed base plate. The pressure block is provided with a vertical guide groove. The guide groove is slidably sleeved on the guide post. The spring abuts against the pressure block and the fixed base plate.

[0010] According to some embodiments of this utility model, the pressure-bearing component further includes a first bolt, a first groove is formed on the upper surface of the fixed base plate, a threaded hole is formed at the bottom of the first groove, the first groove and the threaded hole together form a countersunk screw hole structure, a second groove is formed on the lower surface of the pressure block, a through hole is formed at the bottom of the second groove, the through hole extends upward from the bottom of the second groove to the top of the pressure block, the through hole includes a wide section and a narrow section, the diameter of the wide section is larger than the diameter of the narrow section, the wide section is located above the narrow section, the upper end of the spring is embedded in the second groove, the lower end of the spring is embedded in the first groove, the first bolt passes through the wide section, the narrow section, the spring and the threaded hole from top to bottom, and the outer circumferential diameter of the head of the first bolt is larger than the diameter of the narrow section.

[0011] According to some embodiments of the present invention, a sliding sleeve is fixedly provided in the guide groove, and the guide post passes through the sliding sleeve and slides in cooperation with the sliding sleeve.

[0012] According to some embodiments of this utility model, the punching and shearing assembly further includes an anti-rotation post and a second bolt. The pressure block has a pin hole penetrating its front and rear end faces. The rear end of the positioning post has a fixing pin with a non-circular cross-section. The shape of the fixing pin is adapted to the pin hole. The fixing pin is inserted into the pin hole from the front side of the pressure block. The shape of the anti-rotation post is adapted to the pin hole. The anti-rotation post is inserted into the pin hole from the rear side of the pressure block. The second bolt connects the anti-rotation post and the fixing pin.

[0013] According to some embodiments of the present invention, the punching and shearing assembly further includes a third bolt. A through groove is provided on the positioning post along its axial direction. One end of the through groove is connected to the punch cavity, and the other end is connected to the outside. The inner peripheral wall of the through groove has threads. The punching and shearing needle is provided with a retaining groove. The third bolt is screwed into the through groove, and the end of the third bolt is embedded in the retaining groove to retain the punching and shearing needle.

[0014] According to some embodiments of this utility model, the positioning seat is composed of an upper mold and a lower mold. The upper mold is provided with an upper notch, and the lower mold is provided with a lower notch. The positioning groove is assembled by the upper notch and the lower notch. The lower mold is connected to the fixed base plate by bolts, and the upper mold is connected to the lower mold by bolts. A second feeding groove is provided on the fixed base plate. The second feeding groove is located directly below the first feeding groove and communicates with the first feeding groove.

[0015] According to some embodiments of the present invention, the punching and shearing assembly further includes a baffle plate, which is fixedly disposed at the rear end of the upper die, and the workpiece can abut against the baffle plate after being inserted into the positioning groove.

[0016] According to some embodiments of the present invention, the base plate assembly further includes a feeding plate, which is located below the fixed base plate and is fixedly connected to the fixed base plate. A third feeding groove is provided on the feeding plate, which is located directly below the second feeding groove and is connected to the second feeding groove.

[0017] According to some embodiments of the present invention, the base plate assembly further includes an anti-rotation baffle and a height adjustment block. The height adjustment block is fixed to the front end of the fixed base plate and has a vertical groove. The anti-rotation baffle is arranged in the front-back direction and its rear end is slidably connected to the groove. The anti-rotation baffle can abut against the workpiece to prevent the workpiece from rotating.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is an exploded view of the punching and shearing device of this utility model;

[0021] Figure 2 This is an assembly drawing of the punching and shearing device of this utility model;

[0022] Figure 3 This is a front view of the punching and shearing device of this utility model;

[0023] Figure 4 This is a first sectional view of the punching and shearing device of this utility model (the cutting plane is along the left and right direction).

[0024] Figure 5 This is a structural schematic diagram of the base plate assembly of this utility model;

[0025] Figure 6 This is a second sectional view of the punching and shearing device of this utility model (the cutting plane is along the front and back direction).

[0026] Figure 7 This is a schematic diagram of the installation of the pressure-bearing block and positioning column of this utility model.

[0027] Reference numerals: Positioning seat 110, Positioning groove 111, Receiving cavity 112, Upper die 113, Lower die 114, Positioning pin 120, Punch cavity 121, Fixing pin 122, Through groove 123, Punch shearing pin 130, Slot 131, Material cutting block 140, First material cutting groove 141, Protruding edge 142, Anti-rotation pin 150, Second bolt 160, Third bolt 170, Baffle 180, Pressure block 210, Second groove 21 2. Through hole 213, pin hole 214, first bolt 220, force plate 230, sliding sleeve 240, flange 241, workpiece 300, base plate assembly 400, fixed base plate 410, first groove 411, threaded hole 412, second discharge groove 413, guide post 414, guide post 420, spring 430, discharge plate 440, third discharge groove 441, anti-rotation stop bar 450, height adjustment block 460, slide 461. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Reference Figure 1-7A punching and shearing device includes a punching and shearing assembly and a pressure-bearing assembly. The punching and shearing assembly includes a positioning seat 110, a positioning post 120, a punching and shearing needle 130, and a blanking block 140. The pressure-bearing assembly includes a pressure-bearing block 210 that can move up and down. The positioning post 120 is detachably installed on the front side of the pressure-bearing block 210. A punch cavity 121 is formed on the positioning post 120. The punching and shearing needle 130 is detachably installed in the punch cavity 121, and the head end of the punching and shearing needle 130 extends downward through the positioning post 120. The pressure-bearing block 210, the positioning post 120, and the punching and shearing needle 130 are relatively fixed. The positioning seat 110 is located on the front side of the pressure-bearing block 210. The positioning seat 110 is provided with a positioning groove 111 that penetrates its front and rear end faces. The positioning post 120 passes into the positioning groove 111. An opening is left between the inner peripheral wall of the positioning groove 111 and the outer peripheral wall of the positioning post 120. A gap is provided for the insertion of the workpiece 300. The positioning seat 110 is provided with a receiving cavity 112, which is located below the positioning groove 111. The upper end of the receiving cavity 112 is connected to the positioning groove 111, and the lower end penetrates the bottom of the positioning seat 110. The feeding block 140 is detachably embedded in the receiving cavity 112. The shape of the upper end face of the feeding block 140 is adapted to the shape of the workpiece 300. The shape of the inner peripheral wall of the positioning groove 111 is also adapted to the shape of the workpiece 300 to position the workpiece 300. A vertical first feeding groove 141 is provided on the feeding block 140. The upper end of the first feeding groove 141 is connected to the positioning groove 111. The cross-sectional shape of the upper part of the first feeding groove 141 is adapted to the shape of the head end of the punching needle 130. The punching needle 130 can move downward with the pressure block 210 and extend into the first feeding groove 141. In this embodiment, the workpiece 300 is a circular tube, so the cross-sections of the positioning groove 111 and the positioning post 120 are both circular, and the upper end surface of the blanking block 140 is an arc surface; the accommodating cavity 112 and the blanking block 140 are square, and the bottom of the blanking block 140 has a raised edge 142 around its perimeter. The bottom of the positioning seat 110 is provided with a recessed groove, and the recessed groove is provided along the edge of the accommodating cavity 112. The raised edge 142 is embedded in the recessed groove so that the blanking block 140 is fixed on the positioning seat 110; there are two punching needles 130, namely a round hole punching needle 130 and a U-groove punching needle 130. Two punching cavities 121 are correspondingly provided on the positioning post 120 and the two punching cavities 121 are arranged along the axial direction of the positioning post 120, so that two punches can be formed at one time.

[0031] In some embodiments of this utility model, a base plate assembly 400 is also included. The base plate assembly 400 includes a fixed base plate 410, a guide post 420, and a spring 430. A pressure block 210 is located above the fixed base plate 410. The guide post 420 is vertically mounted on the fixed base plate 410. The pressure block 210 is provided with a vertical guide groove, which is slidably fitted onto the guide post 420. The spring 430 abuts against the pressure block 210 and the fixed base plate 410. The pressure block 210 slides up and down along the guide post 420, and the spring 430 provides an upward driving force for the pressure block 210, enabling the pressure block 210 to permanently reset in a non-pressurized state.

[0032] In some embodiments of this utility model, the pressure-bearing assembly further includes a first bolt 220. A first groove 411 is formed on the upper surface of the fixing base plate 410, and a threaded hole 412 is formed at the bottom of the groove 411. The first groove 411 and the threaded hole 412 together form a countersunk screw hole structure. A second groove 212 is formed on the lower surface of the pressure-bearing block 210, and a through hole 213 is formed at the bottom of the groove 212. The through hole 213 extends upward from the bottom of the groove 212. The through hole 213 extends to the top of the pressure block 210 and includes a wide section and a narrow section. The diameter of the wide section is larger than that of the narrow section, and the wide section is located above the narrow section. The upper end of the spring 430 is embedded in the second groove 212, and the lower end of the spring 430 is embedded in the first groove 411. The first bolt 220 passes through the wide section, the narrow section, the spring 430, and the threaded hole 412 from top to bottom. The outer diameter of the head of the first bolt 220 is larger than the diameter of the narrow section. The upper and lower ends of the spring 430 are respectively embedded in the second groove 212 and the first groove 411, and the first bolt 220 passes through the spring 430 to fix the spring 430 and prevent it from coming out. The first bolt 220 connects the pressure block 210 and the base plate, allowing the pressure block 210 to move up and down without coming out of the guide post 420.

[0033] In some embodiments of this utility model, a sliding sleeve 240 is fixedly disposed in the guide groove, and a guide post 420 passes through the sliding sleeve 240 and slides in cooperation with the sliding sleeve 240. The pressure-bearing assembly also includes a force-bearing plate 230, which is disposed on the upper end face of the pressure-bearing block 210. The force-bearing plate 230 has holes for the guide post 420 to pass through. The force-bearing plate 230 is fixedly connected to the pressure-bearing block 210 by bolts. The top of the sliding sleeve 240 has a flange 241, which is sandwiched between the force-bearing plate 230 and the pressure-bearing block 210 to fix the sliding sleeve 240 relative to the pressure-bearing block 210. The fixing method of the force-bearing plate 230, the pressure-bearing block 210 and the sliding sleeve 240 can achieve a better pressure resistance effect. The sliding sleeve 240 can improve the stability of the movement of the pressure block 210, making the up-and-down sliding smoother, which greatly increases the service life of the punch and shear, and will not cause the problem of jamming and damage to the blade due to steel chips trapped between the punch and shear and the feed chute.

[0034] In some embodiments of this utility model, the punching and shearing assembly further includes an anti-rotation post 150 and a second bolt 160. The pressure block 210 has a pin hole 214 penetrating its front and rear ends. The rear end of the positioning post 120 has a fixing pin 122 with a non-circular cross-section. The shape of the fixing pin 122 matches the pin hole 214, and the fixing pin 122 is inserted into the pin hole 214 from the front side of the pressure block 210. The shape of the anti-rotation post 150 matches the pin hole 214, and the anti-rotation post 150 is inserted into the pin hole 214 from the rear side of the pressure block 210. The second bolt 160 connects the anti-rotation post 150 and the fixing pin 122. Because the fixing pin 122 is non-circular, inserting it into the pin hole 214 prevents the positioning post 120 from rotating. When the positioning post 120 needs to be replaced, the positioning post 120 can be removed by loosening the second bolt 160, making disassembly and assembly convenient.

[0035] In some embodiments of this utility model, the punching and shearing assembly further includes a third bolt 170. A through groove 123 is provided on the positioning post 120 along its axial direction. One end of the through groove 123 communicates with the punch cavity 121, and the other end communicates with the outside. The inner circumferential wall of the through groove 123 has threads. The punching and shearing needle 130 is provided with a retaining groove 131. The third bolt 170 is screwed into the through groove 123, and the end of the third bolt 170 is embedded in the retaining groove 131 to retain the punching and shearing needle 130. Further, the punch cavity 121 vertically penetrates the top and bottom of the positioning post 120. During installation, the punching and shearing needle 130 is inserted into the punch cavity 121, and then the third bolt 170 is screwed into the through groove 123 to secure the punching and shearing needle 130. When the punching and shearing needle 130 needs to be replaced, the third bolt 170 can be removed for replacement, making disassembly and assembly convenient.

[0036] In some embodiments of this utility model, the positioning base 110 is composed of an upper mold 113 and a lower mold 114. The upper mold 113 has an upper notch, and the lower mold 114 has a lower notch. The positioning groove 111 is assembled from the upper notch and the lower notch. The lower mold 114 is bolted to the fixed base plate 410, and the upper mold 113 is bolted to the lower mold 114. A second feeding groove 413 is provided on the fixed base plate 410. The second feeding groove 413 is located directly below the first feeding groove 141 and communicates with the first feeding groove 141. Further, a guide post 414 is vertically fixed on the fixed base plate 410, and the guide post 414 passes through the lower mold 114 and the upper mold 113 from bottom to top. During installation, first insert the lower mold 114 into the guide post 414, and then use bolts to secure the lower mold 114 to the fixed base plate 410. Next, insert the upper mold 113 into the guide post 414, and then use bolts to secure the upper mold 113 to the lower mold 114. The guide post 414 facilitates the positioning and docking of the upper mold 113 and the lower mold 114, improving assembly efficiency.

[0037] In some embodiments of this utility model, the punching and shearing assembly further includes a baffle 180, which is fixed to the rear end of the upper die 113. After the workpiece 300 is inserted into the positioning groove 111, it can abut against the baffle 180. Further, the baffle 180 is provided with a semi-circular notch. The baffle 180 is fitted around the outer periphery of the positioning post 120 through the notch. The baffle 180 is connected to the upper die 113 by bolts. After the workpiece 300 is inserted into the positioning groove 111, it can abut against the edge of the notch.

[0038] In some embodiments of this utility model, the base plate assembly 400 further includes a feeding plate 440, which is located below the fixed base plate 410 and is fixedly connected to the fixed base plate 410. A third feeding groove 441 is formed on the feeding plate 440, located directly below the second feeding groove 413, and communicating with the second feeding groove 413. The feeding plate 440 has a structure adapted to the punch press feeding port, and the feeding plate 440 increases the overall height of the feeding area, providing more feeding space for punching and shearing waste and reducing material accumulation.

[0039] In some embodiments of this utility model, the base plate assembly 400 further includes an anti-rotation baffle 450 and a height adjustment block 460. The height adjustment block 460 is fixed to the front end of the fixed base plate 410, and a vertical groove 461 is provided on the height adjustment block 460. The anti-rotation baffle 450 is arranged in the front-to-back direction, and the rear end of the anti-rotation baffle 450 is slidably connected to the groove 461. The anti-rotation baffle 450 can abut against the workpiece 300 to prevent the workpiece 300 from rotating. The anti-rotation baffle 450 can move up and down along the groove 461, and the position of the anti-rotation baffle 450 can be adjusted according to the needs of the workpiece 300 to expand the applicable range.

[0040] Working principle: After the punching and shearing device is assembled and installed on the punching machine, the workpiece 300 is inserted into the positioning slot 111 to complete the distance positioning. Then, with the help of the anti-rotation stop 450, the workpiece 300 is positioned to prevent rotation. When the punch presses down, it will drive the pressure block 210, the positioning pin 120 and the punching and shearing needle 130 to press down synchronously to complete the punching and shearing of the pipe. When the punch press rises, the pressure block 210 moves upward and resets under the action of the spring 430, preparing for the next positioning work. At this time, the workpiece 300 can be taken out, and the product production is completed.

[0041] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A punching and shearing device, characterized in that, The device includes a punching and shearing assembly and a pressure-bearing assembly. The punching and shearing assembly includes a positioning seat (110), a positioning post (120), a punching and shearing needle (130), and a blanking block (140). The pressure-bearing assembly includes a pressure block (210) that can move up and down. The positioning post (120) is detachably installed on the front side of the pressure block (210). The positioning post (120) has a punch cavity (121). The punching and shearing needle (130) is detachably installed in the punch cavity (121), and the head end of the punching and shearing needle (130) extends downward through the positioning post (120). The positioning seat (110) is located on the front side of the pressure block (210). The positioning seat (110) has a positioning groove (111) that penetrates its front and rear end faces. (120) is inserted into the positioning groove (111). A gap is left between the inner peripheral wall of the positioning groove (111) and the outer peripheral wall of the positioning post (120) for the workpiece (300) to be inserted. The positioning seat (110) is provided with a receiving cavity (112). The unloading block (140) is detachably embedded in the receiving cavity (112). The unloading block (140) is provided with a vertical first unloading groove (141). The upper end of the first unloading groove (141) is connected to the positioning groove (111). The cross-sectional shape of the upper part of the first unloading groove (141) is adapted to the shape of the head end of the punching and shearing needle (130). The punching and shearing needle (130) can move downward with the pressure block (210) and extend into the first unloading groove (141).

2. The punching and shearing device according to claim 1, characterized in that, It also includes a base plate assembly (400), which includes a fixed base plate (410), a guide post (420) and a spring (430). The pressure block (210) is located above the fixed base plate (410). The guide post (420) is vertically installed on the fixed base plate (410). The pressure block (210) is provided with a vertical guide groove, which is slidably fitted onto the guide post (420). The spring (430) abuts against the pressure block (210) and the fixed base plate (410).

3. The punching and shearing device according to claim 2, characterized in that, The pressure-bearing assembly also includes a first bolt (220). A first groove (411) is formed on the upper surface of the fixed base plate (410). A threaded hole (412) is formed at the bottom of the first groove (411). The first groove (411) and the threaded hole (412) together form a countersunk screw hole structure. A second groove (212) is formed on the lower surface of the pressure block (210). A through hole (213) is formed at the bottom of the second groove (212). The through hole (213) extends upwards from the bottom of the second groove (212) to the pressure block (210). At the top of 10), the through hole (213) includes a wide section and a narrow section. The diameter of the wide section is larger than that of the narrow section. The wide section is located above the narrow section. The upper end of the spring (430) is embedded in the second groove (212). The lower end of the spring (430) is embedded in the first groove (411). The first bolt (220) passes through the wide section, the narrow section, the spring (430), and the threaded hole (412) from top to bottom. The outer diameter of the head of the first bolt (220) is larger than that of the narrow section.

4. The punching and shearing device according to claim 2, characterized in that, A sliding sleeve (240) is fixed in the guide groove, and the guide post (420) passes through the sliding sleeve (240) and slides in cooperation with the sliding sleeve (240).

5. The punching and shearing device according to claim 1, characterized in that, The punching and shearing assembly also includes an anti-rotation post (150) and a second bolt (160). The pressure block (210) has a pin hole (214) that penetrates its front and rear ends. The positioning post (120) has a fixing pin (122) with a non-circular cross-section at its rear end. The shape of the fixing pin (122) is adapted to the pin hole (214). The fixing pin (122) is inserted into the pin hole (214) from the front side of the pressure block (210). The shape of the anti-rotation post (150) is adapted to the pin hole (214). The anti-rotation post (150) is inserted into the pin hole (214) from the rear side of the pressure block (210). The second bolt (160) connects the anti-rotation post (150) and the fixing pin (122).

6. The punching and shearing device according to claim 1, characterized in that, The punching and shearing assembly also includes a third bolt (170). The positioning post (120) has a through groove (123) along its axial direction. One end of the through groove (123) is connected to the punch cavity (121), and the other end is connected to the outside. The inner circumferential wall of the through groove (123) has threads. The punching and shearing needle (130) is provided with a retaining groove (131). The third bolt (170) is screwed into the through groove (123), and the end of the third bolt (170) is embedded in the retaining groove (131) to retain the punching and shearing needle (130).

7. The punching and shearing device according to claim 2, characterized in that, The positioning seat (110) is composed of an upper mold (113) and a lower mold (114). The upper mold (113) is provided with an upper notch, and the lower mold (114) is provided with a lower notch. The positioning groove (111) is assembled from the upper notch and the lower notch. The lower mold (114) is connected to the fixed base plate (410) by bolts, and the upper mold (113) is connected to the lower mold (114) by bolts. The fixed base plate (410) is provided with a second feeding groove (413). The second feeding groove (413) is located directly below the first feeding groove (141), and the second feeding groove (413) is connected to the first feeding groove (141).

8. The punching and shearing device according to claim 7, characterized in that, The punching and shearing assembly also includes a baffle (180), which is fixed to the rear end of the upper die (113). After the workpiece (300) is inserted into the positioning groove (111), it can abut against the baffle (180).

9. The punching and shearing device according to claim 7, characterized in that, The base plate assembly (400) further includes a feeding plate (440), which is located below the fixed base plate (410). The feeding plate (440) is fixedly connected to the fixed base plate (410). A third feeding groove (441) is provided on the feeding plate (440), which is located directly below the second feeding groove (413). The third feeding groove (441) is connected to the second feeding groove (413).

10. The punching and shearing device according to claim 2, characterized in that, The base plate assembly (400) further includes an anti-rotation baffle (450) and a height adjustment block (460). The height adjustment block (460) is fixed to the front end of the fixed base plate (410). The height adjustment block (460) has a vertical groove (461). The anti-rotation baffle (450) is arranged in the front-back direction. The rear end of the anti-rotation baffle (450) is slidably connected to the groove (461). The anti-rotation baffle (450) can abut against the workpiece (300) to prevent the workpiece (300) from rotating.

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