Punching tool

Abstract

The utility model belongs to the technical field of punching tools, and particularly relates to a punching tool which comprises a die frame, an upper die and a lower die, an upper die base used for installing the upper die and a lower die base used for installing the lower die are axially arranged on the die frame, a driving mechanism is arranged on the die frame, and the driving mechanism comprises a piston and a power source. The power source drives the piston to move axially, the piston is connected with the upper die, and a limiting mechanism used for limiting radial deflection of the piston is arranged in the upper die base. The limiting structure is arranged in the upper die base, so that the piston is limited in the radial direction when moving axially, the piston, the upper die and the lower die are prevented from being protected when resistance is increased in the axial moving process of the piston, damage is avoided, and the service life of the piston, the upper die and the lower die is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of punching tools, and in particular relates to a punching tool. Background Art

[0002] A punching tool is a device for punching holes on a workpiece. In the field of modern industrial manufacturing, punching tools have become an indispensable and important tool due to their high efficiency and precision. They are mainly used to punch holes in materials such as metals, plastics, and paper. They are widely used in many industries such as automotive manufacturing, electronics manufacturing, construction, and packaging.

[0003] For example, Chinese patent application number (CN201420791811.3) discloses a handheld hydraulic punching machine, which includes a valve body, a hydraulic power source, a push rod piston, a U-shaped frame, a punch, and a lower die sleeve. The push rod piston is pushed by the hydraulic power source, and then the punch is pushed to move toward the lower die sleeve to complete the punching operation. However, no radial limit is imposed between the push rod piston and the U-shaped frame. When the punch encounters increased resistance to the movement of the lower die sleeve (especially when the punch edge is blunt and the workpiece to be punched is metal), as the hydraulic power source continues to apply pressure, when the axial movement is restricted, the piston tends to deflect radially, which in turn causes the punch to deflect, which can easily cause damage to the push rod piston, the punch, and the lower die sleeve, affecting their service life. Utility Model Content

[0004] The purpose of the utility model is to provide a punching tool to solve the above-mentioned technical problems, so as to achieve the effect of radially limiting the position of the ejector piston when punching, avoiding damage to the ejector piston, the punch head and the lower die sleeve, and extending their service life.

[0005] In view of this, the utility model provides a punching tool, comprising:

[0006] A die frame, comprising an upper die seat and a lower die seat arranged axially;

[0007] The upper die is axially slidably mounted in the upper die seat;

[0008] The lower mold is installed in the lower mold base and is matched with the upper mold;

[0009] A driving mechanism is mounted on the mold frame and includes a piston and a power source, the power source drives the piston to move axially, and the piston is connected to the upper mold;

[0010] The limiting structure is arranged in the upper die seat and is used to limit the radial deflection of the piston.

[0011] In the above technical solution, further, the driving mechanism also includes:

[0012] The pump body has one end connected to the power source and the other end connected to the upper die seat, and is axially provided with a piston cavity;

[0013] The piston comprises a piston head which moves axially along the piston cavity and a piston column which is axially arranged on a side of the piston head away from the power source.

[0014] In the above technical solution, further:

[0015] The limiting structure includes a first limiting hole formed at an end of the upper die base away from the piston, and the surface of the piston column is matched with the first limiting hole;

[0016] Wherein, the cross section of the first limiting hole is non-circular.

[0017] In the above technical solution, further:

[0018] The piston head is slidably connected to the inner wall of the piston cavity, and the piston head is detachably connected to the piston column.

[0019] In the above technical solution, further:

[0020] A protrusion is axially arranged on one side of the piston head close to the piston column, and a groove matching the protrusion is axially opened on one end of the piston column close to the piston head.

[0021] In the above technical solution, further:

[0022] The protrusion is axially provided with a first threaded hole, and the piston column is axially provided with a stepped hole;

[0023] Wherein, a first bolt is arranged between the piston head and the piston column for connection.

[0024] In the above technical solution, further:

[0025] A plug post is provided on one side of the upper mold close to the piston, and a first through hole is axially opened in the plug post;

[0026] A plug hole matching the plug column is provided on one side of the stepped hole of the piston column;

[0027] The cross section of the plug column is non-circular, and a second threaded hole is axially opened at the head of the first bolt, and a second bolt is provided between the upper mold and the piston column for connection.

[0028] In the above technical solution, further:

[0029] The surface of the lower mold is provided with a limiting groove along the axial direction;

[0030] A second through hole is opened on the side surface of the lower die base, and a limiting piece is arranged in the second through hole and extends out of the inner wall of the lower die base to match the limiting groove.

[0031] The beneficial effects of the utility model are:

[0032] 1. By setting a limiting structure in the upper die seat, the piston is limited in the radial direction when it moves axially, so as to avoid the increase of resistance during the axial movement of the piston, thereby protecting the piston, the upper die and the lower die, avoiding damage and extending their service life.

[0033] 2. Specifically, by setting the limiting structure as a limiting hole with a non-circular cross section and setting the surface of the piston column to a shape that matches the limiting hole, radial deflection of the piston during axial movement is effectively prevented, and the structure is simple.

[0034] 3. By adopting a split structure for the piston, i.e., comprising a piston head and a piston rod, and the piston rod and the piston head are detachably connected with bolts, during installation, the piston head can be installed in the pump body first, and then the pump body can be connected to the mold frame, and finally the piston rod, the upper mold and the lower mold can be installed in sequence. This can effectively avoid the radial limitation of the piston, which causes the piston head to rub against the inner wall of the pump body when the pump body is installed and connected to the mold frame, causing wear of the sealing ring mounted on the surface of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the utility model;

[0036] Figure 2 It is a top view of the utility model;

[0037] Figure 3 This utility model Figure 2 Sectional view at AA in the middle;

[0038] Figure 4 This utility model Figure 3 The enlarged view of point B in the middle;

[0039] Figure 5 This utility model Figure 2 Sectional view at CC;

[0040] Figure 6 This utility model Figure 5 The enlarged view of point D in the middle;

[0041] Figure 7 It is an exploded view of the piston, the upper mold and the lower mold of the utility model;

[0042] The markings in the figure are as follows: 1. mold frame; 100. upper mold base; 101. lower mold base; 2. upper mold; 20. plug column; 21. first through hole; 22. second bolt; 3. lower mold; 30. limit groove; 31. second through hole; 32. limit member; 4. driving mechanism; 40. piston; 400. piston head; 401. piston column; 402. protrusion; 403. groove; 404. first threaded hole; 405. stepped hole; 406. first bolt; 407. plug hole; 408. second threaded hole; 41. power source; 42. pump body; 43. piston chamber; 5. limit structure; 50. limit hole. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0044] Embodiment 1:

[0045] This embodiment provides a punching tool, comprising:

[0046] The mold frame 1 includes an upper mold base 100 and a lower mold base 101 arranged axially;

[0047] The upper die 2 is axially slidably mounted in the upper die base 100;

[0048] The lower mold 3 is installed in the lower mold base 101 and is adapted to the upper mold 2;

[0049] The driving mechanism 4 is installed on the mold frame 1 and includes a piston 40 and a power source 41. The power source 41 drives the piston 40 to move axially, and the piston 40 is connected to the upper mold 2;

[0050] The limiting structure 5 is arranged in the upper die seat 100 and is used to limit the radial deflection of the piston 40;

[0051] The upper mold 2 is provided with a rubber ring on its surface for soft contact with the lower mold 3;

[0052] At the same time, the power source 41 can be hydraulically driven, electric driven and pneumatically driven, and the principles of hydraulic drive and pneumatic drive are similar. The electric drive can connect the piston 40 to the output end of the motor, and then the motor drives the piston 40 to move axially. The specific structures of the three methods are all existing technologies, and the structure can realize the axial movement of the piston 40, which will not be repeated here.

[0053] It can be seen from the present embodiment that by setting a limiting structure 5 in the upper mold base 100, the piston 40 is radially limited when it moves axially, so as to avoid the increase of resistance during the axial movement of the piston 40, thereby protecting the piston 40, the upper mold 2 and the lower mold 3, avoiding damage and extending their service life.

[0054] Embodiment 2:

[0055] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the driving mechanism 4 also includes:

[0056] The pump body 42 is connected to the power source 41 at one end and to the upper die base 100 at the other end, and is axially provided with a piston 40 cavity;

[0057] The piston 40 includes a piston 40 head that moves axially along the piston 40 cavity and a piston 40 column that is axially arranged on a side of the piston 40 head that is away from the power source 41;

[0058] Meanwhile, the pump body 42 and the upper die base 100 may be connected by threads.

[0059] It can be seen from the present embodiment that by configuring the piston 40 to be a piston 40 head and a piston 40 column, it is convenient to control the movement stroke of the piston 40 through the piston 40 head, and the piston 40 column is convenient to connect with the upper mold 2 and push the upper mold 2 to move, thereby ensuring that the upper mold 2 has the required movement stroke.

[0060] Embodiment 3:

[0061] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0062] The limiting structure 5 includes a limiting hole 50 formed at one end of the upper die base 100 away from the piston 40, and the column surface of the piston 40 is adapted to the limiting hole 50;

[0063] Wherein, the cross section of the limiting hole 50 is a non-circular shape;

[0064] Meanwhile, the non-circular shape may be a combination of straight lines and straight lines (such as a polygon), a combination of straight lines and arcs (such as a sector), and a combination of arcs and arcs (such as an ellipse).

[0065] It can be seen from this embodiment that by setting the limiting structure 5 as a limiting hole 50 with a non-circular cross-section and setting the surface of the piston 40 to a shape that matches it, radial deflection of the piston 40 during axial movement can be effectively prevented, and the structure is simple.

[0066] Embodiment 4:

[0067] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0068] The piston 40 head is slidably connected to the inner wall of the piston 40 cavity, and the piston 40 head is detachably connected to the piston 40 column;

[0069] Among them, a first annular groove is opened on the surface of the piston head 40, and a sealing ring is arranged in the first annular groove. When the power source 41 is applied to hydraulic or pneumatic drive, the sealing performance can be effectively improved.

[0070] It can be seen from this embodiment that by detachably connecting the piston 40 head and the piston 40 column, that is, the piston 40 adopts a split structure, during installation, the piston 40 head can be first installed in the pump body 42, and then the pump body 42 is connected to the mold frame 1, and finally the piston 40 column, the upper mold 2 and the lower mold 3 are installed in sequence, which can effectively avoid the situation that the piston 40 head and the inner wall of the pump body 42 are rubbed when the pump body 42 is installed and connected to the mold frame 1 due to the radial limit of the piston 40, causing the sealing ring sleeved on the surface of the piston 40 to wear.

[0071] Embodiment 5:

[0072] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0073] A protrusion 402 is axially provided on one side of the piston head close to the piston column 40, and a groove 403 matching the protrusion 402 is axially opened on one end of the piston column 40 close to the piston head 40;

[0074] The protrusion 402 and the piston 40 head are of an integrated structure.

[0075] It can be seen from this embodiment that by setting the protrusion 402 on the head of the piston 40 and the groove 403 on the piston 40 column, on the one hand, the connection strength between the two is improved, and on the other hand, the coaxiality between the piston 40 head and the piston 40 column can be ensured, the force uniformity of the upper mold 2 and the lower mold 3 can be ensured, and the service life can be extended.

[0076] Embodiment 6:

[0077] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0078] The protrusion 402 is axially provided with a first threaded hole 404, and the piston 40 is axially provided with a stepped hole 405;

[0079] A first bolt 406 is provided between the piston head 40 and the piston column 40 for connection.

[0080] It can be seen from this embodiment that the piston 40 head and the piston 40 column are connected by using the first bolt 406, and the structure is simple. The opening of the stepped hole 405 allows the head of the first bolt 406 to be built in, thereby facilitating the connection between the piston 40 column and the upper mold 2.

[0081] Embodiment 7:

[0082] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0083] A plug post 20 is provided on one side of the upper mold 2 close to the piston 40, and a first through hole 21 is axially opened in the plug post 20;

[0084] A plug hole 407 adapted to the plug column 20 is provided on one side of the stepped hole 405 of the piston 40;

[0085] The cross section of the plug post 20 is non-circular, and a second threaded hole 408 is axially opened at the head of the first bolt 406, and a second bolt 22 is provided between the upper mold 2 and the piston 40 column for connection;

[0086] Meanwhile, the non-circular shape may be a combination of straight lines and straight lines (such as a polygon), a combination of straight lines and arcs (such as a sector), and a combination of arcs and arcs (such as an ellipse);

[0087] The tightening direction of the first bolt 406 and the first threaded hole 404 is the same as the tightening direction of the second threaded hole 408 and the second bolt 22, that is, when the second bolt 22 and the second threaded hole 408 are tightened, the connection between the first bolt 406 and the second threaded hole 408 will not become loose.

[0088] It can be seen from the present embodiment that by arranging the plug column 20 on the upper mold 2 and the plug hole 407 on the piston 40 column, the connection strength and coaxiality between the upper mold 2 and the piston 40 column are improved, and a second threaded hole 408 is opened at the head of the first bolt 406 and connected by the second bolt 22, so as to improve the convenience of disassembly and assembly and reduce the manufacturing difficulty.

[0089] Embodiment 8:

[0090] This embodiment provides a punching tool, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0091] The surface of the lower mold 3 is provided with a limiting groove 30 along the axial direction;

[0092] A second through hole 31 is formed on the side of the lower die base 101, and a stopper 32 is provided in the second through hole 31 and extends out of the inner wall of the lower die base 101 to fit with the stopper groove 30;

[0093] A third through hole is also formed on the side of the lower die base 101, and a first plug is provided in the third through hole, and the first plug abuts against the surface of the lower die 3.

[0094] The stopper 32 includes a ball, and the second through hole 31 is located on one side of the inner wall of the lower mold base 101 and is a tapered hole to prevent the ball from completely falling out of the second through hole 31. A spring and a second plug are provided on the side of the ball away from the lower mold 3.

[0095] The second plug pushes the spring to abut the ball, so that a part of it protrudes from the inner wall of the lower die seat 101 and fits into the limiting groove 30 , and a second annular groove flush with the height of the ball extending out of the lower die seat 101 is also provided on the surface of the lower die 3 .

[0096] It can be seen from this embodiment that by providing a limiting groove 30 along the axial direction on the lower mold 3 and abutting against the limiting member 32, the lower mold 3 can be limited in the radial direction, thereby preventing the lower mold 3 from deflecting in the radial direction, preventing damage, and extending the service life;

[0097] In addition, the limiting groove 30 opened along the axial direction facilitates the removal of the lower mold 3, and the limiting member 32 adopts the setting of the second plug, spring and ball, and cooperates with the second annular groove on the surface of the lower mold 3, which can facilitate the alignment of the lower mold 3, improve the assembly convenience, ensure the limiting effect, and then lock the lower mold 3 through the first plug.

[0098] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A punching tool, characterized in that: include: A mold frame (1) comprises an upper mold base (100) and a lower mold base (101) arranged axially; An upper die (2) is axially slidably mounted in an upper die seat (100); A lower mold (3) is installed in the lower mold base (101) and is compatible with the upper mold (2); A driving mechanism (4) is mounted on the mold frame (1) and comprises a piston (40) and a power source (41), wherein the power source (41) drives the piston (40) to move axially, and the piston (40) is connected to the upper mold (2); The limiting structure (5) is arranged in the upper die seat (100) and is used to limit the radial deflection of the piston (40).

2. The punching tool according to claim 1, characterized in that The driving mechanism (4) further comprises: A pump body (42) is connected to the power source (41) at one end and to the upper die base (100) at the other end, and is provided with a piston cavity (43) in the axial direction; The piston (40) comprises a piston head (400) that moves axially along the piston chamber (43) and a piston column (401) that is axially arranged on a side of the piston head (400) that is away from the power source (41).

3. The punching tool according to claim 2, characterized in that: The limiting structure (5) comprises a limiting hole (50) provided at one end of the upper die base (100) away from the piston (40), and the surface of the piston column (401) is adapted to the limiting hole (50); Wherein, the cross section of the limiting hole (50) is non-circular.

4. The punching tool according to claim 3, characterized in that: The piston head (400) is slidably connected to the inner wall of the piston chamber (43), and the piston head (400) is detachably connected to the piston column (401).

5. The punching tool according to claim 4, characterized in that: A protrusion (402) is axially provided on one side of the piston head (400) close to the piston column (401), and a groove (403) adapted to the protrusion (402) is axially opened on one end of the piston column (401) close to the piston head (400).

6. The punching tool according to claim 5, characterized in that: The protrusion (402) is axially provided with a first threaded hole (404), and the piston column (401) is axially provided with a stepped hole (405); Wherein, a first bolt (406) is provided between the piston head (400) and the piston column (401) for connection.

7. The punching tool according to claim 6, characterized in that: A plug post (20) is provided on one side of the upper mold (2) close to the piston (40), and a first through hole (21) is axially opened in the plug post (20); The piston column (401) is provided with a plug hole (407) on one side of the stepped hole (405) and is adapted to the plug column (20); The cross section of the plug column (20) is non-circular, and a second threaded hole (408) is axially opened at the head of the first bolt (406), and a second bolt (22) is provided between the upper mold (2) and the piston column (401) for connection.

8. The punching tool according to claim 1, characterized in that: The surface of the lower mold (3) is provided with a limiting groove (30) along the axial direction; A second through hole (31) is provided on the side of the lower die base (101), and a limiting member (32) is provided in the second through hole (31) and extends out of the inner wall of the lower die base (101) to match the limiting groove (30).

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