Stamping die assembly for screw head forming

Abstract

The utility model belongs to the field of fastener manufacturing, and particularly relates to a stamping die assembly for forming a screw head. The utility model provides a stamping die assembly for forming a screw head. The stamping die assembly comprises a lower base, a lower die sleeve, an upper base and an upper die, the upper die is sleeved and fixed in a sleeve hole B in the bottom of the upper base, and the lower die sleeve is supported on the lower base; the lower die is sleeved and fixed in a sleeve hole A formed in the top of the lower die sleeve; a top face fixing hole is formed in the top face of the lower die and used for fixedly containing a to-be-machined screw. The bottom of the upper die is provided with a punch which extends downwards and faces a fixing hole in the top face of the lower die. The punch is provided with a hexagon socket screw head structure, a linear groove screw head structure, a cross-shaped groove screw head structure or a flower-shaped groove screw head structure. The lower base is arranged on a workbench of the stamping equipment, and the upper base is arranged on a die block of the stamping equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the fastener manufacturing field, concretely relates to a stamping die combination for screw head forming. BACKGROUND

[0002] The inner hexagonal, the single slot, the cross slot and the flower type slot structure are common in the head of the screw, the set screw and other fasteners. The processing technology of the screw head is various, wherein the stamping mode has the characteristics of high efficiency and consistency. The conventional screw head forming processing usually uses the cold header, which is only one of the various processes of the cold header. Although this scheme has the advantages of short production time and suitable for large-scale batch production, it is not convenient in die replacement, and the process is complex and time-consuming.

[0003] For the head forming processing demand of small batch screw fasteners, electric spark machining is usually used, but the processing cost of this scheme is high. Therefore, it is a technical problem to design a screw head forming stamping die which can conveniently replace the forming die and is suitable for small batch processing demand. INVENTION CONTENTS

[0004] Therefore, the utility model provides a stamping die combination for screw head forming, which comprises a lower base, a lower die sleeve, an upper base and an upper die;

[0005] The upper die sleeve is fixedly connected to the sleeve hole B at the bottom of the upper base, and the lower die sleeve is supported on the lower base;

[0006] The lower die sleeve is fixedly connected to the sleeve hole A at the top of the lower die sleeve;

[0007] The lower die top surface is provided with a top surface fixing hole for fixing and placing the screw to be processed;

[0008] The bottom of the upper die is provided with a punch extending downward and towards the lower die top surface fixing hole; the punch is provided with an inner hexagonal, a single slot, a cross slot or a flower type slot screw head structure;

[0009] The lower base is arranged on the workbench of the stamping equipment, and the upper base is arranged on the die block of the stamping equipment.

[0010] Preferably, a side surface threaded fastening hole A is arranged in the side wall of the lower die sleeve, which is in communication with the sleeve hole A, and the screw is screwed into the side surface threaded fastening hole A to abut against the outer peripheral wall of the lower die;

[0011] A limiting groove A is arranged on the outer side wall of the lower die at a certain position and in the circumferential direction, and the screw abuts against the limiting groove A.

[0012] Preferably, a threaded fastening hole B is formed in the upper base side wall, the threaded fastening hole B is communicated with the sleeve hole B, and a screw passes through the side threaded fastening hole B to abut against the outer peripheral wall of the upper die;

[0013] A limiting groove B is arranged on the outer side wall of the upper die in a circumferential direction, and the screw passes through the side threaded fastening hole B to abut against the limiting groove B.

[0014] Preferably, the top surface of the lower die is flush with the top surface of the lower die sleeve, and the bottom surface of the upper die is flush with the bottom surface of the upper base.

[0015] Preferably, the height of the lower die is greater than the depth of the sleeve hole A, so as to facilitate the installation and disassembly between the lower die and the lower die sleeve.

[0016] The height of the upper die is greater than the depth of the sleeve hole B, so as to facilitate the installation and disassembly between the upper die and the upper die sleeve.

[0017] Preferably, the lower die sleeve, the lower die and the upper die are all made of alloy steel.

[0018] Advantages

[0019] (1) The stamping die combination can complete the screw head forming conveniently and quickly by means of the workbench of the stamping equipment and the die block, and is free from the restrictions of the cold header for large batch processing, and the problems of inconvenient replacement of the die and long time consumption in the processing procedure, and is suitable for small batch screw head forming.

[0020] (2) The lower die is in a detachable relationship with the lower die sleeve through the sleeve hole A, and the upper base is in a detachable relationship with the upper die through the sleeve hole B, and on this basis, the fastening effect between the lower die sleeve and the lower die and between the upper base and the upper die is further increased through the abutting relationship between the grooves of the upper die and the lower die and the screw.

[0021] (3) The punch can be provided with a hexagonal socket, a straight slot, a cross slot or a patterned slot screw head structure, so that the stamping die combination can process screw fasteners with different head structures, and the application range is increased.

[0022] (4) The height of the lower die is greater than the depth of the hole A, and the height of the upper die is greater than the depth of the sleeve hole B, so as to facilitate the installation and disassembly between the lower die and the lower die sleeve and between the upper die and the upper base, and improve the processing efficiency of the screw fasteners. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure installation schematic diagram of an embodiment of the utility model;

[0024] Figure 2is a lower mold sleeve schematic view of the utility model;

[0025] Figure 3 is a lower mold schematic view of the utility model;

[0026] Figure 4 is an upper mold schematic view of the utility model;

[0027] Figure 5 is an upper base schematic view of the utility model;

[0028] Wherein, 1 - lower base, 2 - lower mold sleeve, 3 - lower mold, 4 - upper base, 5 - upper mold, 6 - top fixed hole, 7 - punch, 8 - threaded hole, 31 - sleeve hole A, 32 - threaded fastening hole A, 33 - limit groove A, 41 - sleeve hole B, 42 - threaded fastening hole B, 51 - limit groove B. DETAILED DESCRIPTION

[0029] The utility model will be further described below in conjunction with the drawings: it needs to be emphasized that the embodiment of the utility model is illustrative, not restrictive, therefore the utility model is not limited to the embodiment described in the specific embodiment, any other embodiment obtained by the technical solution of the utility model by the person skilled in the art, also belongs to the scope of the utility model protection.

[0030] As Figures 1-5 Shown, a kind of for screw head forming punch die combination, include: lower base 1, lower mold sleeve 2, upper base 4, upper mold 5;Wherein, upper mold 5 is fixedly sleeved in the sleeve hole B 41 of upper base 4 bottom, lower mold sleeve 2 is supported and arranged on lower base 1, lower mold 3 is fixedly sleeved in the sleeve hole A 31 of lower mold sleeve 2 top, and the top of lower mold 3 is equipped with top fixed hole 6, for fixedly placed to be processed screw;The bottom of upper mold 5 is equipped with punch 7 extending downward and towards the top fixed hole 6 of lower mold 3, and punch 7 is equipped with internal hexagon, slot, cross slot, pattern slot or other screw head structure;When using, the lower base 1 is fixedly arranged on the workbench of punch equipment by fastener, the upper base 4 is arranged on the die block of punch equipment, when the die block of punch device moves towards workbench, the punch 7 of the bottom of upper mold 4 extrudes the screw to be processed placed in the top fixed hole 6 of lower mold 3, so that the head of the screw to be processed placed on lower mold 3 forms internal hexagon, slot, cross slot or pattern slot structure, when punch device completes work, the head of the screw to be processed is processed and is taken out from the top fixed hole of upper mold 5.

[0031] As an example, the punch 7 of the upper die 5 is provided with an internal hexagonal, a slot, a cross slot, a pattern slot or other shaped structure, so that through the stamping die combination, according to the specific needs, different upper dies 5 (the punch 7 of different upper dies 5 is provided with different shaped structures) are used, which can not only complete the screw head forming simply and quickly, but also meet the screw head forming needs of different styles.

[0032] A sleeve hole A31 is formed in the top surface of the lower die sleeve 2 for sleeving the lower die 3. The lower die 3 is in clearance fit with the sleeve hole A31, so that the lower die sleeve 2 and the lower die 3 are detachably connected. Not only is the lower die 3 convenient to disassemble and lubricate for protection, but also is conducive to prolonging the service life of the die, and the lower die 3 is convenient to replace quickly for different processing needs.

[0033] A side surface threaded fastening hole A32 in communication with the sleeve hole A31 is formed in the symmetrical position of the side wall of the lower die sleeve 2. The screw is screwed into the side surface threaded fastening hole A32 to abut against the outer peripheral wall of the lower die 3, so as to fasten the lower die 3 in the sleeve hole A31 of the lower die sleeve 2. Moreover, a limiting groove A33 is arranged on the outer side wall of the lower die 3 at a certain position in the circumferential direction. The screw abuts against the limiting groove A33 to realize the positioning and fixing of the lower die 3, and further increase the fastening effect of the lower die sleeve 2 on the lower die 3.

[0034] A sleeve hole B41 is formed in the bottom end surface of the upper base 4 towards the lower die 3 for sleeving the upper die 5. The upper die 5 is in clearance fit with the sleeve hole B41, so that the upper die 5 and the upper base 4 are detachably connected. Not only is the upper die 5 convenient to disassemble and lubricate for protection, but also is conducive to prolonging the service life of the die, and the upper die 5 is convenient to replace quickly for different processing needs.

[0035] A side surface threaded fastening hole B42 is formed in the side wall of the upper base 4. The side surface threaded fastening hole B42 is in communication with the sleeve hole B41. The screw passing through the side surface threaded fastening hole B42 can abut against the outer peripheral wall of the upper die 5, so as to fasten the upper die 5 in the sleeve hole B41. A limiting groove B51 is arranged on the outer side wall of the upper die 5 at a certain position in the circumferential direction. The screw passing through the side surface threaded fastening hole B42 abuts against the limiting groove B51 to realize the positioning and fixing of the upper die 5, and further increase the fastening effect of the upper base 4 on the upper die 5. In addition, referring to Figure 1 , the top surface of the lower die 3 is flush with the top surface of the lower die sleeve 2, and the bottom surface of the upper die 5 is flush with the bottom surface of the upper base 4, which is conducive to improving the contact area of the upper die 5 and the lower die 3 during stamping and improving the stability. Moreover, the bottom surface of the lower die sleeve 2 and the top surface of the lower base 1 are provided with threaded holes for connecting with double-headed studs, so as to connect the lower die sleeve 2 and the lower base 1 through the double-headed studs.

[0036] When the screws with the same size but different head structures are made, the punch 7 corresponding to the screw head structure is used, at this time only the upper die 5 needs to be replaced; when the screws with different sizes are made, the different upper dies 5 and lower dies 3 can be quickly replaced, the punch 7 of the different upper dies 5 has different size specifications, and the different lower dies 3 have different size top fixing holes 6.

[0037] As another example, the height of the lower die 3 is greater than the depth of the sleeve hole A31, facilitating the installation and disassembly between the lower die 3 and the lower die sleeve 2, and the height of the upper die 5 is greater than the depth of the sleeve hole B41, facilitating the installation and disassembly between the upper die 5 and the upper die sleeve 4.

[0038] As an example, the lower die sleeve 2, the lower die 3 and the upper die 5 are all made of alloy steel material.

[0039] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A stamping die assembly for forming screw heads, characterized in that, It includes a lower base (1), a lower mold sleeve (2), an upper base (4), and an upper mold (5); The upper mold (5) is sleeved and fixed in the sleeve hole B (41) at the bottom of the upper base (4), and the lower mold sleeve (2) is supported on the lower base (1); The lower mold (3) is fitted and fixed inside the sleeve hole A (31) provided on the top of the lower mold sleeve (2); The lower mold (3) has a top surface fixing hole (6) on its top surface for fixing and placing the screw to be processed; The bottom of the upper mold (5) is provided with a punch (7) that extends downward and faces the fixing hole (6) on the top surface of the lower mold (3); the punch (7) is provided with an internal hexagonal, slotted, cross-slotted or flower-shaped screw head structure; The lower base (1) is set on the worktable of the stamping equipment, and the upper base (4) is set on the mold block of the stamping equipment.

2. The stamping die assembly for forming screw heads according to claim 1, characterized in that, A side threaded fastening hole A (32) communicating with the sleeve hole A (31) is opened at a symmetrical position on the side wall of the lower mold sleeve (2). The screw can be screwed into the side threaded fastening hole A (32) and abut against the outer peripheral wall of the lower mold (3). A limiting groove A (33) is provided circumferentially at a set position on the outer side wall of the lower mold (3), and the screw abuts against the limiting groove A (33).

3. The stamping die assembly for forming screw heads according to claim 1, characterized in that, A threaded fastening hole B (42) is provided on the side wall of the upper base (4). The threaded fastening hole B (42) is connected to the sleeve hole B (41). The screw passes through the threaded fastening hole B (42) and can abut against the outer peripheral wall of the upper mold (5). A limiting groove B (51) is provided circumferentially at a set position on the outer side wall of the upper mold (5), and the screw passes through the side threaded fastening hole B (42) and abuts against the limiting groove B (51).

4. A stamping die assembly for forming screw heads according to any one of claims 1-3, characterized in that, The top surface of the lower mold (3) is flush with the top surface of the lower mold sleeve (2), and the bottom surface of the upper mold (5) is flush with the bottom surface of the upper base (4).

5. A stamping die assembly for forming screw heads according to any one of claims 1-3, characterized in that, The height of the lower mold (3) is greater than the depth of the sleeve hole A (31), which facilitates the installation and disassembly of the lower mold (3) and the lower mold sleeve (2); The height of the upper mold (5) is greater than the depth of the sleeve hole B (41), which facilitates the installation and disassembly of the upper mold (5) and the upper mold sleeve.

6. A stamping die assembly for forming screw heads according to any one of claims 1-3, characterized in that, The lower mold sleeve (2), lower mold (3) and upper mold (5) are all made of alloy steel.

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