Grounding angle steel blanking die and working method thereof

Abstract

The ground angle steel punching die and working method thereof belong to the technical field of stamping forming die, the ground angle steel punching die is installed on a numerical control angle steel punching machine main body, and is used for punching a pointed angle shape of an end part of a ground angle steel, and comprises a die frame, an upper punch head and a female die, further comprises a female die support block, the female die support block is coaxially stacked below the female die, the female die support block is installed in a deepened lower die receiving concave table, and a position of the female die support block corresponds to a let-out cavity below a punching cavity of the female die; a contour shape of the let-out cavity is consistent with the punching cavity and the area of the let-out cavity is greater than that of the punching cavity. The female die support structure is improved, and the service life of the die is improved.

Description

Technical Field

[0001] This invention relates to the field of stamping die technology, and in particular to a ground angle steel punching die and its working method. Background Technology

[0002] Grounding angle steel falls under the category of power railway accessories and is generally used as a vertical grounding electrode in the grounding grid of power poles or substations. For example... Figure 1 As shown, the bottom end of the grounding angle steel 1' needs to be cut into a pointed shape 101', with the pointed end facing down for easy insertion into the ground to form a grounding electrode. For example... Figure 2 and Figure 3 As shown, in existing technologies, CNC hydraulic punching lines are commonly used in mass production to process the sharp corner 101' and wiring holes of the grounding angle steel 1'. The upper punch head 4' and the female die 5', made of mold steel, are installed at the upper and lower positions of the mold frame 3', respectively. The upper punch head 4' is installed at the bottom end of the upper punch sleeve 301', and the female die 5' is installed in the lower die receiving recess 302' on the lower platform of the mold frame 3'. When the punching hydraulic cylinder 201' of the CNC angle steel punching machine body 2' extends and retracts, it drives the upper punch sleeve 301' to reciprocate along the guide sleeve, thereby carrying the upper punch head 4' into and out of the punching cavity 501' of the female die 5', completing the punching of the triangular pieces of the angle steel edge.

[0003] For ordinary angle steel, the main body 2' of the CNC angle steel punching machine and the existing punching dies can reliably and stably punch and form the steel. However, the angle steel specifications of the ground angle steel 1' are generally L40×40×4, that is, 4 mm thick, or even thicker, and the punching at the inner rounded corners of the angle steel will further increase the cutting thickness. On the other hand, in order to ensure the diversity of punching shapes, the actual width of the support recess 302' of the lower die 5' supporting the edge of the female die 5' does not exceed 3 mm, and the thickness of the female die 5' is often not more than 15 mm, resulting in the edge of the punching cavity 501' of the female die 5' bearing a large punching bending moment. Figure 4 As shown, during punching, the beveled edge of the female die 5' is most prone to breakage and dent damage, resulting in crack 503'. Damage to the female die 5' often prevents the punching of even a few hundred ground angle steels 1', severely affecting the service life of the die.

[0004] To overcome the above problems, a grounding angle steel punching die and its working method are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a grounding angle steel punching die and its working method, which improves the female die support structure and increases the service life of the die.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a grounding angle steel punching die and its working method. Installed on the main body of a CNC angle steel punching machine, it is used to punch the pointed corner shape of the end of the grounding angle steel. The die includes a die frame, an upper punch head, and a female die, and also includes a female die support block. The female die support block is coaxially stacked below the female die and installed in a deepened lower die receiving recess. A clearance and outlet cavity is correspondingly formed in the middle of the female die support block below the punching cavity of the female die. The outline shape of the clearance and outlet cavity is consistent with the punching cavity, and its area is larger than that of the punching cavity.

[0007] Practical application of the technical solution presented in this application shows that it significantly improves the stress distribution on the female mold and greatly reduces the bending moment on its cavity sidewalls during impact. This avoids fractures and dent cracks, and significantly extends the mold's service life.

[0008] Furthermore, the female mold support block is made of 45# steel with heat treatment.

[0009] Furthermore, the distance between the outline of the yielding cavity and the blanking cavity does not exceed 2 mm.

[0010] Furthermore, the outer wall of the female mold support block is provided with a groove corresponding to the keyway of the outer wall of the female mold.

[0011] Furthermore, it also includes a stripping component, which is disposed on the female die support block and is capable of removing the triangular pieces adhering to the bottom surface of the upper die head when the upper die head punches out of the blanking cavity or returns.

[0012] The addition of the stripping component enables the smooth removal of triangular pieces even when material sticks to the edge of the upper punch head after wear, thus preventing stacked parts during punching and further improving the service life of the mold.

[0013] Furthermore, the stripping assembly includes a torsion spring, a center pin, and a stop pin; the bottom surface of the female mold support block has a vertical mounting groove at the middle position of the inclined side of the relief and guide cavity; the spiral sleeve of the torsion spring is sleeved on the center pin; the working end of the torsion spring has an upward and inward protruding push head, which can push the triangular piece brought out by the upper punch head from the side; the stop pin limits the working end of the torsion spring from the inside.

[0014] Furthermore, the pusher head specifically adopts an arc-shaped bend with its opening facing downwards. The outer end of the pusher head can push the triangular piece and also scrape down the triangular piece that was not removed in the previous stage when the upper punch head returns.

[0015] Furthermore, the material stripping assembly also includes a set screw, and the bottom surface of the mounting groove is vertically provided with a threaded hole outside the center pin, and the set screw is threaded into the threaded hole; the top end of the set screw pushes against the fixed end wire of the torsion spring.

[0016] Furthermore, a groove is provided on the top surface of the set screw, and the fixed end wire of the torsion spring is elastically pressed into the groove.

[0017] The present invention also discloses a working method for a grounding angle steel punching die, wherein the grounding angle steel punching die described in any of the above-mentioned embodiments is used to complete the sharp corner punching process of the end of the grounding angle steel; and a female die support block is used to provide auxiliary support for the female die.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention relates to a grounding angle steel punching die and its working method. By placing a female die support block under the female die, the support strength of the female die is increased, ensuring that the contour shape of the outlet cavity matches the punching cavity. This also increases the support strength of the sidewalls of the punching cavity, preventing deformation caused by bending moments during the punching process. This invention improves the female die support structure and extends the die's service life.

[0019] Furthermore, the 45# steel tempered material of the female mold support block possesses both a certain degree of hardness and good toughness, resulting in excellent comprehensive mechanical properties. It provides significant support force without being damaged due to its brittleness. By adding the stripping component to the female mold support block, the triangular pieces adhering to the bottom surface of the upper punch head can be assisted in removing them, reducing the risk of stacked parts being punched and improving the stable operation of the mold. A torsion spring is used as the core component of the stripping component, providing elastic support against the side wall of the upper punch head. It also has high hardness, low wear, and a long service life, eliminating the need for frequent replacements. A mounting slot for the stripping component is vertically cut in the middle of the inclined side of the exit cavity, enabling concealed installation. Regardless of the size of the angle steel being cut, the inclined side is always the cutting edge, ensuring the ejector head contacts the side wall of the triangular piece. A stop pin internally limits the working end of the torsion spring, preventing it from tilting excessively inward and failing to return to its original position. By employing a fixed-end steel wire with a set screw limiting torsion spring, the preload of the torsion spring can be flexibly adjusted, thereby adjusting the pushing force applied to the triangular piece by the jacking head. A groove is created on the top surface of the set screw, and when the jacking force is adjusted, the fixed-end steel wire is elastically pressed into the groove. This stabilizes the fixed-end steel wire and prevents the set screw from rotating and loosening.

[0020] The working method of the ground angle steel punching die of the present invention significantly increases the support strength of the female die, avoids it from being subjected to large bending moment and strain at the punching edge, and reduces its fracture and cracking. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 A schematic diagram of the end structure of an existing grounding angle steel; Figure 2 This is a schematic diagram of the main structure of an existing CNC angle steel punching machine. Figure 3 A three-dimensional structural diagram of the mold frame part of the main body of an existing CNC angle steel punching machine; Figure 4 This is a schematic diagram illustrating the damage to the female mold in an existing mold. Figure 5 This is a schematic diagram of the front sectional view of the mold frame part of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of a portion of the central I section; Figure 7 This is a top view of the end structure of the set screw in this invention.

[0023] Explanation of reference numerals in the attached figures: 1' Grounding angle steel; 101' Sharp corner; 2' Main body of CNC angle steel punching machine; 201' Punching hydraulic cylinder; 3' Die frame; 301' Upper punch die sleeve; 302' Lower die receiving recess; 4' Upper punch die head; 5' Female die; 501' Punching cavity; 502' Keyway; 503' Fracture crack; 1. Female mold support block; 101. Displacement and ejection cavity; 102. Mounting groove; 103. Threaded hole; 2. Torsion spring; 201. Ejector head; 3. Center pin; 4. Stop pin; 5. Ejector screw; 501. Slot. Detailed Implementation

[0024] The core of this invention is to provide a grounded angle steel punching die and its working method, which improves the female die support structure and increases the die's service life.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 invention 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 invention.

[0027] Refer to the attached diagram. Figure 1 A schematic diagram of the end structure of an existing grounding angle steel; Figure 2 This is a schematic diagram of the main structure of an existing CNC angle steel punching machine. Figure 3 A three-dimensional structural diagram of the mold frame part of the main body of an existing CNC angle steel punching machine; Figure 4 This is a schematic diagram illustrating the damage to the female mold in an existing mold. Figure 5 This is a schematic diagram of the front sectional view of the mold frame part of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of a portion of the central I section; Figure 7 This is a top view of the end structure of the set screw in this invention.

[0028] Example 1 In one specific implementation, such as Figures 1-4 As shown, the grounding angle steel punching die of the present invention is similar to the existing angle steel blowing die in that it is installed on the main body 2' of the CNC angle steel punching machine and is used to punch the pointed corner 101' shape at the end of the grounding angle steel 1'. It includes a die frame 3', an upper punching die 4' and a female die 5'. The upper punching die 4' and the female die 5' are both cylindrical in shape and are made of high-hardness die steel material.

[0029] A key innovation of this invention is the addition of a female die support block 1. The female die support block 1 is coaxially stacked below the female die 5'. It is installed within a deepened lower die receiving recess 302', meaning the lower die receiving recess 302' needs to be deepened to allow the female die 5' and the female die support block 1 to fit. The top surface of the female die 5' is flush with the lower worktable surface of the die frame 3'. The female die 5' and the female die support block 1 are tightly stacked together. A clearance outlet cavity 101 is correspondingly provided in the middle of the female die support block 1 below the blanking cavity 501' of the female die 5'. The outline shape of the clearance outlet cavity 101 is consistent with the blanking cavity 501', but its area is slightly larger.

[0030] By placing a female mold support block 1 under the female mold 5', the support strength of the female mold 5' is increased, allowing the outline shape of the outlet cavity 101 to be consistent with the blanking cavity 501', and increasing the support strength of the side wall of the blanking cavity 501', thus avoiding deformation caused by bending moment during the blanking process. This invention provides a ground angle steel blanking die, improves the female mold support structure, and extends the die's service life.

[0031] Specifically, such as Figure 5 As shown, the female mold support block 1 is made of 45# steel with heat treatment.

[0032] After quenching and tempering, 45# steel has a certain hardness and good toughness, resulting in good comprehensive mechanical properties. It can provide greater support force and will not be damaged due to hardness and brittleness.

[0033] Specifically, such as Figure 5 As shown, the distance between the outlines of the yielding cavity 101 and the blanking cavity 501' shall not exceed 2 mm. That is, the side wall of the blanking cavity 501' shall not bear a large bending moment alone. At the same time, the corner radius of the yielding cavity 101 can be increased to reduce stress concentration.

[0034] Specifically, such as Figure 5 As shown, the outer wall of the female mold support block 1 has a groove corresponding to the keyway 502' on the outer wall of the female mold 5'. This prevents the female mold support block 1 from rotating circumferentially during use and avoids misalignment of the discharge cavity 101 relative to the punching cavity 501'.

[0035] The applicant's factory uses the mold structure of Example 1 to produce grounding angle steel 1'. Currently, more than 3,000 grounding angle steel 1's have been produced, and no female mold 5' has broken. Compared with the previous situation where the blanking mold needed to be replaced after only a few hundred pieces, the service life of the mold has been significantly improved.

[0036] Example 2 In actual production, another significant reason why angle steel punching dies are prone to damage is that after prolonged use, the upper punch 4' is prone to wear at its bottom edge, increasing the clearance between it and the punching cavity 501'. The punched triangular pieces easily develop burrs at their edges, which, when covering the edge of the upper punch 4', tend to adhere to its bottom surface. If the upper punch 4' carries the triangular pieces with it during its return stroke, it will increase punching resistance during the next punching operation, potentially causing the die to break. To prevent this, improvements are needed, and this embodiment is formed by modifying the above-described embodiment 1.

[0037] like Figure 5 and Figure 6As shown, the grounding angle steel punching die of the present invention also includes a stripping component, which is disposed on the female die support block 1 and can remove the triangular piece adhering to the bottom surface of the upper punch head 4' when the upper punch head 4' punches out of the punching cavity 501' or returns.

[0038] By adding the stripping component to the female mold support block 1, the triangular pieces adhering to the bottom surface of the upper punch head 4' can be assisted in removing, reducing the risk of stacked parts punching and improving the stable operation performance of the mold.

[0039] Specifically, such as Figure 5 and Figure 6 As shown, the stripping assembly includes a torsion spring 2, a center pin 3, and a stop pin 4. A mounting groove 102 is vertically formed on the bottom surface of the female mold support block 1 at the midpoint of the inclined side of the relief outlet cavity 101. The mounting groove 102 is a narrow slot and not a through groove running vertically. The spiral sleeve of the torsion spring 2 is fitted onto the center pin 3, which is perpendicular to the side wall of the mounting groove 102. Countersunk holes can be provided at both ends of the pin mounting hole. An ejector head 201 protrudes upwards and inwards from the working end of the torsion spring 2. The ejector head 201 can push the triangular piece brought out by the upper punch head 4' from the side. That is, the ejector head 201 can contact the side wall of the punched triangular piece as the upper punch head 4' protrudes out of the punching cavity 501'. The stop pin 4 internally limits the working end of the torsion spring 2 to prevent it from tilting excessively inwards and failing to return to its original position. The stop pin 4 is parallel to the center pin 3 and countersunk holes can be provided at both ends of the pin mounting hole.

[0040] The torsion spring 2 is used as the core component of the stripper assembly. It can elastically abut against the side wall of the upper punch 4', and has high hardness, low wear, and long service life, eliminating the need for frequent replacement. A mounting groove 102 for installing the stripper assembly is vertically opened at the middle of the inclined side of the relief outlet cavity 101, achieving concealed installation. Furthermore, regardless of the size of the angle steel being cut, the inclined side will always be the cutting edge, ensuring that the push head 201 can contact the side wall of the triangular piece. The stop pin 4 internally limits the working end of the torsion spring 2, preventing it from tilting excessively inward and failing to return to its original position.

[0041] Obviously, the stripping assembly can also take other forms, such as a single spring or a striking mechanism to assist in removing the triangular pieces. However, these methods are less stable and prone to failure.

[0042] Specifically, such as Figure 5 and Figure 6As shown, the ejector head 201 is specifically designed as an arc-shaped bend with its opening facing downwards. The top of the arc-shaped bend is located outside the inclined side of the punching cavity 501' under the limitation of the stop pin 4. The outer end of the ejector head 201 can push against the side wall of the triangular piece and can also scrape down the triangular piece that was not removed in the previous stage during the return stroke of the upper punch head 4'.

[0043] By setting the ejector head 201 to a downward-facing arc-shaped bend, when the upper punch 4' punches out of the blanking cavity 501', the inward end of the arc-shaped bend first abuts against the side wall of the triangular piece and elastically retracts outward. The reaction force is applied to the triangular piece, pushing it relative to the upper punch 4' towards the other side of the gap, causing it to fall off. If the triangular piece adheres strongly to the upper punch 4' and is not pushed off, then during the return stroke of the upper punch 4', the bottom edge of the inward end of the arc-shaped bend scrapes against the side wall of the upper punch 4' and peels the previously unremoved triangular piece downward, allowing it to fall off smoothly.

[0044] In one specific implementation of this embodiment, such as Figures 5-7 As shown, the material removal assembly also includes a set screw 5, which is an internal hexagonal threaded plug. A threaded hole 103 is vertically provided on the bottom surface of the mounting groove 102 outside the center pin 3, meaning the threaded hole 103 spans across the mounting groove 102, and the width of the mounting groove 102 does not exceed one-third of the nominal diameter of the threaded hole 103. The set screw 5 is threaded into the threaded hole 103. The top of the set screw 5 pushes upwards against the fixed end wire of the torsion spring 2.

[0045] By using the fixed end steel wire of the torsion spring 2 and the limit screw 5, the preload of the torsion spring 2 can be flexibly adjusted, thereby adjusting the pushing force applied to the triangular piece by the push head 201.

[0046] Obviously, the fixed end wire of the torsion spring 2 can also be installed using a stop pin limiting method, but the pushing force applied to the triangular piece by the jacking head 201 cannot be flexibly adjusted.

[0047] Specifically, such as Figures 5-7 As shown, a slot 501 is provided on the top surface of the top screw 5, and the steel wire at the fixed end of the torsion spring 2 is elastically pressed into the slot 501.

[0048] Specifically, such as Figure 6 and Figure 7 As shown, the length of the card slot 501 is limited to the radius and it is inclined with the outer side lower than the inner side. Multiple card slots 501 are evenly distributed around the circumference.

[0049] By opening a groove 501 on the top surface of the top screw 5, and when the tightening force of the top screw 5 is adjusted, the fixed end steel wire is elastically pressed into the groove 501. On the one hand, the fixed end steel wire can be stabilized, and on the other hand, the top screw 5 can be prevented from rotating and loosening.

[0050] The working principle of the grounding angle steel punching die in this embodiment is as follows: During the punching process, the bottom surface of the upper punch head 4' first contacts the right-angle edge of the grounding angle steel billet, and under the pushing action of the punching hydraulic cylinder 201', a triangular piece is punched off and enters the punching cavity 501', continuing to descend and exit the punching cavity 501'. The inward end of the pusher head 201 first abuts against the side wall of the triangular piece and elastically retracts outward, applying a reaction force to the side wall of the triangular piece, causing it to move and shift relative to the bottom surface of the upper punch head 4' to the other side of the gap, thus causing it to fall off. If the triangular piece adheres strongly to the upper punch head 4', it will not be pushed off and fall off by the pusher head 201 during the downward movement of the upper punch head 4'. During the return stroke of the upper punch 4', the bottom edge of the inward-facing end of the ejector head 201 scrapes against the side wall of the upper punch 4' and continues to scrape against the joint between the triangular piece and the bottom surface of the upper punch 4', peeling off any triangular pieces that were not removed earlier and allowing them to fall off smoothly. This prevents the upper punch 4' from carrying the triangular pieces with it after the return stroke, which would result in a stacked material punch in the next punching, damaging the mold.

[0051] In summary, the grounding angle steel punching die of the present invention, by placing a female die support block 1 under the female die 5', increases the support strength of the female die 5', ensures that the outline shape of the outlet cavity 101 is consistent with the punching cavity 501', and increases the support strength of the side wall of the punching cavity 501', thus avoiding deformation caused by bending moment during the punching process. The grounding angle steel punching die of the present invention improves the female die support structure and increases the service life of the die. In addition, 45# steel, after tempering, has a certain hardness and good toughness, with good comprehensive mechanical properties, which can provide greater support force and will not be damaged due to hardness and brittleness. By adding the stripping component to the female die support block 1, the triangular pieces adhering to the bottom surface of the upper punch head 4' can be assisted in removing, reducing the risk of stacked parts punching and improving the stable operation performance of the die. The torsion spring 2 is used as the core component of the stripper assembly. It can elastically abut against the side wall of the upper punch 4', and has high hardness, low wear, and long service life, eliminating the need for frequent replacement. A mounting groove 102 for installing the stripper assembly is vertically opened at the middle of the inclined side of the relief outlet cavity 101, achieving concealed installation. Furthermore, regardless of the size of the angle steel being cut, the inclined side is always the cutting edge, ensuring that the push head 201 can contact the side wall of the triangular piece. The stop pin 4 internally limits the working end of the torsion spring 2, preventing it from tilting excessively inward and failing to return to its original position. The use of the set screw 5 to limit the fixed end wire of the torsion spring 2 allows for flexible adjustment of the preload of the torsion spring 2, thereby adjusting the pushing force applied to the triangular piece by the push head 201. A slot 501 is opened on the top surface of the set screw 5, and when the tightening force of the set screw 5 is adjusted, the fixed end wire is elastically pressed into the slot 501. This stabilizes the fixed end wire and prevents the set screw 5 from rotating and loosening.

[0052] This invention also discloses a working method for a grounding angle steel punching die. Using any of the above embodiments, the grounding angle steel punching die is used to complete the punching of the pointed corner 101' at the end of the grounding angle steel 1'. Two sets of the grounding angle steel punching dies, staggered front and back, are needed to complete two punching operations, removing two triangular pieces to form the pointed corner 101'. A female die support block 1 is used to provide auxiliary support for the female die 5'.

[0053] It significantly increases the support strength of the female die 5', avoids it from being subjected to large bending moments and strain at the punching edge, and reduces its fracture and cracking.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0055] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A punching die for grounding angle steel, mounted on the main body (2') of a CNC angle steel punching machine, used for punching the pointed corner (101') shape at the end of a grounding angle steel (1'), comprising a die frame (3'), an upper punching die (4'), and a female die (5'), characterized in that, It also includes a female mold support block (1), which is coaxially stacked below the female mold (5'). The female mold support block (1) is installed in the deepened lower mold receiving recess (302'). A relief outlet cavity (101) is correspondingly opened in the middle position of the female mold support block (1) below the blanking cavity (501') of the female mold (5'). The outline shape of the relief outlet cavity (101) is consistent with that of the blanking cavity (501') and its area is larger than that of the blanking cavity (501').

2. The grounding angle steel punching die according to claim 1, characterized in that: The female mold support block (1) is made of 45# steel with heat treatment.

3. The grounding angle steel punching die according to claim 1, characterized in that: The distance between the outline of the yielding cavity (101) and the blanking cavity (501') does not exceed 2 mm.

4. The grounding angle steel punching die according to claim 1, characterized in that: The outer wall of the female mold support block (1) is provided with a groove corresponding to the keyway (502') on the outer wall of the female mold (5').

5. The grounding angle steel punching die according to any one of claims 1 to 4, characterized in that: It also includes a stripping component, which is disposed on the female die support block (1) and is capable of removing the triangular piece of material adhering to the bottom surface of the upper die head (4') when the upper die head (4') punches out of the blanking cavity (501') or returns.

6. The grounding angle steel punching die according to claim 5, characterized in that, The stripping assembly includes a torsion spring (2), a center pin (3), and a stop pin (4); the bottom surface of the female mold support block (1) is vertically provided with an installation groove (102) at the middle position of the inclined side of the relief outlet cavity (101); the spiral sleeve of the torsion spring (2) is sleeved on the center pin (3); the working end of the torsion spring (2) has an upward and inward protruding push head (201); the push head (201) can push the triangular piece brought out by the upper punch head (4') from the side; the stop pin (4) limits the working end of the torsion spring (2) from the inside.

7. The grounding angle steel punching die according to claim 6, characterized in that: The push head (201) is specifically designed in the form of an arc bend with the opening facing downwards. The outer end of the push head (201) can push the triangular piece and can also scrape the triangular piece that was not removed in the early stage when the upper punch head (4') returns.

8. The grounding angle steel punching die according to claim 6, characterized in that: The material removal assembly also includes a top screw (5), and the bottom surface of the mounting groove (102) is vertically provided with a threaded hole (103) outside the center pin (3). The top screw (5) is threaded into the threaded hole (103); the top of the top screw (5) pushes the fixed end wire of the torsion spring (2).

9. The grounding angle steel punching die according to claim 8, characterized in that: The top surface of the top screw (5) is provided with a slot (501), and the steel wire at the fixed end of the torsion spring (2) is elastically pressed into the slot (501).

10. A method for working a grounding angle steel punching die, characterized in that: The sharp corner (101') of the end of the grounding angle steel (1') is punched using the punching die of any one of claims 1 to 9; the female die support block (1) is used to provide auxiliary support for the female die (5').

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