CN210059486U

CN210059486U - Cold-heading bolt rod part bending-prevention die

Info

Publication number: CN210059486U
Application number: CN201920578865.4U
Authority: CN
Inventors: 池彬彬; 杨前淼
Original assignee: Zhejiang Keshuo Fastener Co Ltd
Current assignee: Zhejiang Keshuo Fastener Co Ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-02-14
Anticipated expiration: 2029-04-25

Abstract

The utility model relates to a mould technical field can avoid the screw rod crooked when the drawing of patterns, still has simple structure, convenient to use's technical characterstic. Especially, two-stage shoulder hole has been seted up to cold-heading bolt pole portion, the aperture of the first shoulder hole of upside suits with the external diameter of the supporting shoe of bolt head bottom, the aperture of the second shoulder hole of downside is greater than first shoulder hole, be provided with a bush in the first shoulder hole, the lower extreme system of bush has the round shirt rim, the external diameter of shirt rim suits with the second shoulder hole, the hole of bush suits with the screw rod, the hole that the thimble penetrated the bush from down up, the downthehole spring that is equipped with of second shoulder hole, the shirt rim that leans on the bush is supported to the upper end of spring, the lower extreme of spring supports and leans on in the frame of lower mould bottom.

Description

Cold-heading bolt rod part bending-prevention die

Technical Field

The utility model belongs to the technical field of the mould technique and specifically relates to a cold-heading bolt pole portion anti-bending die.

Background

After the blank is manufactured by the bolt through cold heading, the blank needs to be subjected to edge cutting treatment by using an edge cutting die, and a hexahedron is formed through edge cutting, so that the high-quality bolt head can be obtained. The existing trimming die comprises a lower die 2 and a trimming die 1, wherein a stepped hole is formed in the lower die and used for accommodating a screw rod 5 and a supporting block 4 at the bottom of a bolt head 3, after the trimming die is punched, the redundant part of the bolt head is cut off to form a regular hexagon head, and then an ejector pin 6 is pushed upwards from the bottom of the lower die to demold the bolt. In the mold, the demolding of the bolt is completely completed by the force applied by the ejection head to the screw, and the screw part is easy to bend during the ejection due to the larger shearing surfaces between the screw and the support block and the mold, so that the improvement is still needed.

Disclosure of Invention

The utility model aims at overcoming not enough among the above-mentioned background art, provide a cold-heading bolt pole portion bending die, can avoid the screw rod crooked when the drawing of patterns, still have simple structure, convenient to use's technical characterstic.

The technical purpose of the utility model is realized like this:

the utility model provides a cold-heading bolt pole portion anti-bending die, including lower mould and cut off die, two-stage shoulder hole has been seted up to the lower mould, the aperture of the first shoulder hole of upside suits with the external diameter of the supporting shoe of bolt head bottom, the aperture of the second shoulder hole of downside is greater than first shoulder hole, be provided with a bush in the first shoulder hole, the lower extreme system of bush has the round shirt rim, the external diameter of shirt rim suits with the second shoulder hole, the hole and the screw rod of bush suit, the hole that the thimble penetrated the bush from up down, the downthehole spring that is equipped with of second shoulder, the shirt rim that leans on the bush is supported to the upper end of spring, the lower extreme of spring supports and leans on in the.

Preferably, the top of the bushing is flush with the top surface of the lower die.

Preferably, the bushing is a clearance fit with the first stepped bore.

Compared with the prior art, the utility model has the following advantage: the utility model discloses increase spring and bush in the lower mould, the bush upwards pushes up the bearing surface under the spring action during the drawing of patterns, and the drawing of patterns of supplementary screw rod avoids pole portion crooked, simple structure, convenient to use.

Drawings

Fig. 1 is a schematic structural view of a conventional mold.

Fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.

As shown in figure 2, the anti-bending die for the rod part of the cold heading bolt comprises a lower die 2 and a trimming die 1, wherein the lower die 2 is fixed on a rack (or a machine tool), the trimming die 1 is positioned above the lower die 2 and connected with a stamping mechanism, and an ejector pin 6 is arranged at the lower part of the lower die 2 and connected with a hydraulic mechanism, can stretch up and down and plays a role in demoulding. The above structure is similar to the prior art and will not be described in detail herein.

Two-stage shoulder hole has been seted up along vertical direction to lower mould 2, the aperture of the first shoulder hole of upside suits with the external diameter of the supporting shoe 4 of bolt head 3 bottom (supporting shoe 4 is generally circular), the aperture of the second shoulder hole 9 of downside is greater than first shoulder hole, first shoulder hole clearance fit has a bush 7, the lower extreme system of bush 7 has a round shirt rim, the external diameter of shirt rim suits with second shoulder hole 9, the hole of bush 7 suits with screw rod 5, thimble 6 is from up penetrating the hole of bush 7 down, be equipped with spring 8 in the second shoulder hole 9, spring 8's upper end is to the shirt rim that leans on bush 7, spring 8's lower extreme supports and leans on in the frame of lower mould 2 bottom. The spring 8 always keeps applying upward spring 8 force to the bushing 7, and when the bolt is not installed, the spring 8 force forces the skirt to always cling to the top end of the second stepped hole 9, and at the moment, the top of the bushing 7 is flush with the top surface of the lower die 2.

The spring 8 is generally a commercially available strong spring 8, and the bush 7 is made of the same material as the lower die 2 or a conventional metal material having a higher strength than the lower die 2.

The utility model discloses a theory of operation is: insert the pole portion of bolt in the hole of bush 7, the bottom of supporting shoe 4 is pressed at the top of bush 7 this moment, then trimming die 1 dashes down, 3 portions of bolt head cut edge, the impact force can make bush 7 overcome spring 8 power and contract back to in the first stepped hole, supporting shoe 4 follows bush 7 and gets into first stepped hole, trimming die 1 rises after the punching press is accomplished, spring 8 kick-backs, bush 7 resets, with the ejecting first stepped hole of

spring

8, 6 upsets of thimble, with the ejecting bush 7 of screw rod 5, accomplish the drawing of patterns.

The above description is only a preferred embodiment of the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a cold-heading bolt pole portion bending die, includes lower mould (2) and trimming die (1), its characterized in that: two-stage ladder hole has been seted up in lower mould (2), the aperture in the first ladder hole of upside suits with the external diameter of supporting shoe (4) of bolt head (3) bottom, the aperture in the second ladder hole (9) of downside is greater than first ladder hole, be provided with a bush (7) in the first ladder hole, the lower extreme system of bush (7) has the round shirt rim, the external diameter and second ladder hole (9) of shirt rim suit, the hole and screw rod (5) of bush (7) suit, thimble (6) are from up penetrating the hole of bush (7) down, be equipped with spring (8) in second ladder hole (9), the upper end of spring (8) is supported the shirt rim that is leaning on bush (7), the lower extreme of spring (8) supports and leans on in the frame of lower mould (2) bottom.

2. The anti-bending die for the rod part of the cold-heading bolt as claimed in claim 1, wherein: the top of the bushing (7) is flush with the top surface of the lower die (2).

3. The anti-bending die for the rod part of the cold-heading bolt as claimed in claim 1, wherein: the bushing (7) is in clearance fit with the first stepped hole.