An internal hexagonal hole punching device

Abstract

The present invention discloses an internal hexagonal hole punching device, which includes a base. The bottom of the chuck body is rotatably arranged on the base. A chute is formed on the top surface of the chuck body. When the chuck body rotates, a plurality of jaws can slide along the chute to clamp or loosen the part. Above the jaws, there is a positioning plate. A punch for punching an internal hexagon on the part is connected to the positioning plate through a threaded bushing. The positioning plate and the guide sleeve are fixed on the upper template, and the bottom of the guide post I is fixed on the base. The guide post I sequentially passes through the inner hole of the guide sleeve and the through hole on the upper template. This device has a simple structure, strong versatility, convenient operation, accurate positioning, high precision, and the processed parts meet the process requirements, having economic applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a device for punching internal hexagonal holes. Background Art

[0002] The machining and manufacturing of internal hexagonal holes are commonly used in connecting parts, such as internal hexagonal bolts. The materials of internal hexagonal connecting parts are usually stainless steel and a small amount of non-ferrous metals. The internal hexagonal dimensions are relatively unified, but the external dimension specifications are diverse, and most of them are circular. The blanks are bar materials. When machining each different specification of internal hexagonal parts by traditional methods, it is necessary to design a punching die according to the external dimensions of the parts, resulting in a long machining cycle and high machining costs; design problems and manufacturing problems will inevitably occur during the design process, further prolonging the production cycle. Summary of the Invention

[0003] Object of the Invention

[0004] In order to solve the above problems, the present invention provides a device for punching internal hexagonal holes.

[0005] Technical Solution of the Invention

[0006] In order to achieve the above object of the invention, the present invention adopts the following technical solutions:

[0007] A device for punching internal hexagonal holes includes a base. The bottom of the chuck body is rotatably arranged on the base. A chute is formed on the top surface of the chuck body. When the chuck body rotates, a plurality of jaws can slide along the chute to clamp or loosen the part. A positioning plate is arranged above the jaws. A punch for punching internal hexagons on the part is connected to the positioning plate through a threaded bushing. The positioning plate and the guide sleeve are fixed on the upper template. The bottom of the first guide post is fixed on the base, and the first guide post sequentially passes through the inner hole of the guide sleeve and the through hole on the upper template.

[0008] Preferably, it further includes a housing and a stripper plate. The base is fixed at the bottom of the housing. The stripper plate is supported by the housing. A bushing is arranged in the bushing mounting hole at one end of the stripper plate. The other end of the stripper plate is threadedly connected with a guide rod with a retaining disc. A spring is arranged on the guide rod. One end of the spring is limited by the retaining disc on the guide rod, and the other end of the spring is limited by a limiting block connected to the housing. The upper end of the vertically arranged guiding and positioning block is fixed on the positioning plate. When the punch performs punching, the positioning plate moves downward, and the lower end of the guiding and positioning block inserts into the hole on the stripper plate, so that the lower end of the punch passes through the bushing and then punches the part. At this time, the spring is in a compressed state due to the limitation of the limiting block and the retaining disc on the guide rod. When the punching is completed, the positioning plate moves upward, and the guiding and positioning block is separated from the stripper plate. Under the elastic force of the spring, the stripper plate moves away from the part.

[0009] Preferably, the outer circumferential surface of the lower end of the chuck body is provided with an axial helical gear structure. Both ends of the threaded screw engaged with the axial helical gear are rotatably arranged in the mounting holes of the positioning blocks on the housing. The end face of the threaded screw is provided with a groove for connecting a tool for screwing the threaded screw.

[0010] Preferably, the bottom of the guiding positioning block is a wedge shape that slopes obliquely upward from the end close to the spring.

[0011] Preferably, it further includes a vertically arranged guide post II. The upper end of the guide post II is fixed on the positioning plate, and the lower end is inserted into another hole on the stripper plate during punching. The bottom surface of the guide post II is located above the bottom surface of the guiding positioning block. The guide post II is in clearance fit with the hole on the stripper plate and has a higher positioning accuracy than the positioning accuracy of the guiding positioning block.

[0012] Preferably, the threaded bushing is a stepped cylindrical shape that is larger at the top and smaller at the bottom. Its bottom surface is provided with a mounting hole coaxial with the threaded bushing. The upper part of the punch is arranged in the mounting hole of the threaded bushing, and the nut is threadedly connected to the threaded bushing to fix the punch.

[0013] Preferably, the top surface of the chuck body is provided with three chutes arranged at intervals of 120°. A chuck is arranged on each chute. The chucks are respectively slidably connected in the chutes through screws connected to the bottoms of the chucks. As the chuck body rotates, the chucks approach or move away from the center of the chuck body simultaneously.

[0014] Preferably, the punch is a three-section coaxial structure. The upper section is a cylindrical structure, and the profile of the lower section is adapted to the hexagonal dimensions of the punched hexagonal hole. The upper and lower sections are connected in the middle through a transition section.

[0015] Preferably, the stripper plate is Z-shaped. The bushing is arranged on one of the horizontal sections. A reinforcing rib is arranged at the turning point connected to this horizontal section. The bushing is in interference fit with the bushing mounting hole on the stripper plate. A boss is arranged on the top surface of the other horizontal section, and the hole cooperating with the guiding positioning block penetrates through this boss.

[0016] Preferably, a die shank is connected to the top of the upper template.

[0017] Advantages of the present invention

[0018] The advantages of the present invention are as follows: The device has a simple structure, strong versatility, convenient operation, accurate positioning, high precision, and the processed parts meet the process requirements, having economic applicability. Description of the drawings

[0019] Figure 1 is a bottom view of an internal hexagonal hole punching device of the present invention.

[0020] Figure 2 is Figure 1 the A-A sectional view of

[0021] Figure 3 It is a schematic diagram of the worm structure.

[0022] Figure 4 It is a schematic diagram of the chuck structure.

[0023] Figure 5 It is the front view of the chuck.

[0024] Figure 6 It is the top view of the chuck.

[0025] Figure 7 It is a schematic diagram of the housing structure.

[0026] Figure 8 It is the top view of the housing.

[0027] Figure 9 It is Figure 8 the A-A sectional view of

[0028] Figure 1 In the figure: 1. Die holder, 2. Screw, 3. Cylindrical pin Ⅰ, 4. Upper template, 5. Locating plate, 6. Threaded bushing, 7. Nut, 8. Punch, 9. Guide bushing, 10. Guide pillar Ⅰ, 11. Bushing, 12. Chuck jaw, 13. Screw, 14. Housing, 15. Chuck body, 16. Screw, 17. Base, 18. Part, 19. Cylindrical pin Ⅱ, 20. Stripper plate, 21. Guide pillar Ⅱ, 22. Guide and positioning block, 23. Guide rod, 24. Limit block, 25. Spring, 26. Cylindrical pin Ⅲ, 27. Screw, 28. Socket head cap screw, 29. Stripper plate guide plate, 30. Locating pin, 31. Locating block, 32. Worm. Specific embodiments

[0029] Combined with the summary of the invention content and the drawings, the specific embodiments of the present invention will be described in detail.

[0030] An internal hexagonal hole punching device includes a housing 14 and a base 17. The housing 14 is a hollow structure with openings at the top and bottom. The base 17 is fixed to the bottom of the housing 14 through a cylindrical pin Ⅱ19 and a screw 16. A ring-shaped boss is provided on the top surface of the base 17. The bottom of the chuck body 15 is rotatably arranged in the ring-shaped boss of the base 17. Three chutes are provided on the top surface of the chuck body 15 at intervals of 120°. The chutes are inclined slender grooves and form a certain angle with the radius of the chuck body 15. The tail of the chute is circular. The upper end of the chuck body 15 is disc-shaped, and there is a part of a turbine-type helical gear on the lower cylinder. The chuck body 15 has an inner hole. Both ends of the worm 32 meshing with the turbine-type helical gear are rotatably arranged in the mounting holes of the positioning block 31 on the housing 14. The end face of the worm 32 is provided with a groove for connecting a tool for screwing the worm 32. In this embodiment, the groove is hexagonal, and a hexagonal wrench is used to screw the worm 32.

[0031] The three jaws 12 are respectively slidably connected to the chute through screws 13. When the chuck body 15 rotates, the three jaws 12 slide simultaneously along the chute closer to or away from the center of the chuck body 15 to clamp or release the part.

[0032] The worm 32 has threads in the middle and smooth rods at both ends. The smooth rods are in clearance fit with the mounting holes of the positioning blocks 31, and there is a groove at one end.

[0033] A positioning plate 5 is arranged above the jaw 12. A punch 8 for punching an internal hexagon on the part is connected to the positioning plate 5 through a threaded bushing 6. The positioning plate 5 and the guide sleeve 9 are fixed on the upper template 4. The positioning plate 5 is connected to the upper template 4 through a cylindrical pin Ⅰ3 and a screw 27. The bottom of the guide pillar Ⅰ10 is fixed on the base 17. The guide pillar Ⅰ10 sequentially passes through the inner hole of the guide sleeve 9 and the through hole on the upper template 4. The top of the upper template 4 is connected with a die shank 1 through a screw 2. The die shank is connected to a punching press during the working state.

[0034] The threaded bushing 6 is in the shape of a stepped cylinder with a larger upper part and a smaller lower part. An installation hole coaxial with the threaded bushing 6 is opened at its bottom surface. The upper part of the punch 8 is arranged in the installation hole of the threaded bushing 6. A nut 7 is threadedly connected to the outer circumferential surface of the lower part of the threaded bushing 6 to fix the punch 8.

[0035] The punch 8 is a three-stage coaxial structure. The upper section is a cylindrical structure with threads. The profile of the lower section is adapted to the hexagonal dimension of the punched hexagonal hole. The upper and lower middle parts are connected by a transition section, which is used to prevent the lower end from breaking during stamping. When the internal dimension is different or the punch is damaged, only the punch part needs to be replaced and it can continue to work by fixing with a nut.

[0036] It also includes a stripping plate 20. The stripping plate 20 is supported by the housing 14. The stripping plate 20 is Z-shaped. The bushing 11 is arranged on the upper horizontal section. The bushing 11 is in interference fit with the bushing mounting hole. A reinforcing rib is provided at the turning point connected to the horizontal section. A boss is provided on the top surface of the lower horizontal section. A guide rod 23 with a stop disc is threadedly connected to the end of the lower horizontal section of the stripping plate 20. A spring 25 is arranged on the guide rod 23. One end of the spring 25 is limited by the stop disc on the guide rod 23, and the other end of the spring 25 is limited by a limit block 24 connected to the housing 14. The guide rod 23 passes through the hole on the limit block 24. The vertically arranged guiding and positioning block 22 and the upper end of the guide post II 21 are fixed on the positioning plate 5 by a cylindrical pin III 26. The bottom of the guiding and positioning block 22 is a wedge shape that slopes obliquely upward from the end close to the spring 25. The bottom surface of the guide post II 21 is above the bottom surface of the guiding and positioning block 22. The stripping plate 20 is provided with positioning holes into which the guiding and positioning block 22 and the guide post II 21 can be inserted. The positioning hole cooperating with the guiding and positioning block 22 penetrates the boss on the stripping plate 20. The guide post II 21 is in clearance fit with the positioning hole on the stripping plate 20, and the positioning accuracy is higher than that of the guiding and positioning block 22. When the punch 8 performs punching, the positioning plate 5 moves downward, and the lower ends of the guiding and positioning block 22 and the guide post II 21 are respectively inserted into the positioning holes on the stripping plate 20 corresponding to the guiding and positioning block 22 and the guide post II 21, so that the lower end of the punch 8 passes through the inner hole of the bushing 11 and punches the part. At this time, the spring 25 is in a compressed state due to the limitation of the limit block 24 and the stop disc on the guide rod 23. When the punching is completed, the positioning plate 5 moves upward, and the guiding and positioning block 22 and the guide post II 21 are separated from the stripping plate 20. Under the elastic force of the spring 25, the stripping plate 20 moves away from the part.

[0037] The working process is as follows: Rotate the worm 32 axially with a hexagon wrench. The screw thread drives the gear of the chuck body 15. When the chuck body 15 rotates, the screw 13 assembled in the chute of the chuck body 15 also moves accordingly, driving the 3 jaws 12 to move synchronously to clamp the part. When not working, the stripping plate 20 moves away from the position where the part is clamped under the elastic force of the spring 25, facilitating the taking and placing of the part. When working, the guiding and positioning block 22 first contacts the positioning hole corresponding to the position of the stripping plate 20 and the guiding and positioning block 22 and applies pressure. The applied force radially pushes the stripping plate 20 to move towards the part. After the guiding and positioning block 22 is inserted into the positioning hole, the guide post II 21 is positioned again to ensure the accuracy. The lower end of the punch 8 passes through the inner hole of the bushing 11 on the stripping plate 20. The bushing 11 not only positions the punch 8 but also protects the punch 8 to prevent the slender punch part at the lower end of the punch 8 from bending. The moving punch 8 applies a tangential force to the part 18 to complete the processing of the internal hexagon. When the punch 8 moves upward, the guiding and positioning block 22 and the guide post II 21 are separated from the stripping plate 20. Under the elastic force of the spring 25, the stripping plate 20 moves away from the part, and the worker takes out the part to complete the entire processing process.

[0038] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered by the protection scope of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. An internal hexagonal hole punching device, characterized in that: It includes a base. The bottom of the chuck body is rotatably arranged on the base. A chute is provided on the top surface of the chuck body. When the chuck body rotates, several jaws can slide along the chute to clamp or loosen the part. Above the jaws, there is a positioning plate. A punch for punching an internal hexagon on the part is connected to the positioning plate through a threaded bushing. The positioning plate and the guide sleeve are fixed on the upper template. The bottom of the guide post I is fixed on the base. The guide post I sequentially passes through the inner hole of the guide sleeve and the through hole on the upper template. The device also includes a housing and a stripper plate. The base is fixed at the bottom of the housing. The stripper plate is supported by the housing. A bushing is arranged in the bushing installation hole at one end of the stripper plate. The other end of the stripper plate is threadedly connected with a guide rod with a retaining disc. A spring is arranged on the guide rod. One end of the spring is limited by the retaining disc on the guide rod, and the other end of the spring is limited by a limit block connected to the housing. The upper end of the vertically arranged guiding and positioning block is fixed on the positioning plate. When the punch performs punching, the positioning plate moves downward, and the lower end of the guiding and positioning block inserts into the hole on the stripper plate, so that the lower end of the punch passes through the bushing and then punches the part. At this time, the spring is in a compressed state due to the limitation of the limit block and the retaining disc on the guide rod. When the punching is completed, the positioning plate moves upward, and the guiding and positioning block is separated from the stripper plate. Under the action of the spring force, the stripper plate moves away from the part. The bottom of the guiding and positioning block is a wedge shape that slopes obliquely upward from the end close to the spring. The stripper plate is Z-shaped. The bushing is arranged on one of the horizontal sections. A reinforcing rib is arranged at the turning point connected to this horizontal section. The bushing is in interference fit with the bushing installation hole on the stripper plate. A convex platform is arranged on the top surface of the other horizontal section. The hole cooperating with the guiding and positioning block penetrates through the convex platform.

2. The internal hexagonal hole punching device according to claim 1, characterized in that: The outer circumferential surface at the lower end of the chuck body has an axis helical gear structure. The two ends of the worm meshing with part of the turbine helical gear are rotatably arranged in the installation holes of the positioning blocks on the housing. The end face of the worm has a groove for connecting a tool for screwing the worm.

3. The internal hexagonal hole punching device according to claim 2, characterized in that: It also includes a vertically arranged guide post II. The upper end of the guide post II is fixed on the positioning plate, and the lower end inserts into another hole on the stripper plate during punching. The bottom surface of the guide post II is above the bottom surface of the guiding and positioning block. The guide post II has a clearance fit with the hole on the stripper plate and the positioning accuracy is higher than that of the guiding and positioning block.

4. The internal hexagonal hole punching device according to claim 3, characterized in that: The threaded bushing is a stepped cylindrical shape with a larger upper part and a smaller lower part. An installation hole coaxial with the threaded bushing is provided on its bottom surface. The upper part of the punch is arranged in the installation hole, and a nut is threadedly connected to the threaded bushing to fix the punch.

5. The internal hexagonal hole punching device according to claim 4, characterized in that: Three chutes are provided on the top surface of the chuck body at intervals of 120°. One jaw is arranged on each chute. The jaws are respectively slidably connected in the chutes through screws connected to the bottoms of the jaws. As the chuck body rotates, each jaw approaches or moves away from the center of the chuck body simultaneously.

6. The internal hexagonal hole punching device according to claim 5, characterized in that: The punch is a three-section coaxial structure. The upper section is a cylindrical structure, and the profile of the lower section is suitable for the hexagon size of the punched hexagon hole. The upper and lower sections are connected by a transition section in the middle.

7. A hexagon socket internal hole punching device according to any one of claims 1 to 6, characterized in that: A die shank is connected to the top of the upper template.

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