CN210059485U

CN210059485U - Square bolt burr-free trimming die

Info

Publication number: CN210059485U
Application number: CN201920578864.XU
Authority: CN
Inventors: 杨前淼; 池彬彬
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 not form the burr when the punching press, guarantees the assembly precision of cubic bolt, still has simple structure, convenient to use's technical characterstic. The square bolt burr-free trimming die comprises a trimming die and a lower die, wherein a vertical die hole is formed in the lower die and used for accommodating a screw rod of a bolt, an ejector pin is arranged on the lower portion of the die hole, a square counter bore is formed in the top of the die hole, and the size of the counter bore is matched with a supporting surface of the square bolt.

Description

Square bolt burr-free trimming die

Technical Field

The utility model belongs to the technical field of the mould technique and specifically relates to a square bolt does not have burr side cut mould.

Background

After the square bolt is subjected to cold heading to manufacture a blank, the blank needs to be subjected to edge cutting treatment by using an edge cutting die, and a tetrahedron is formed by edge cutting, so that a high-quality bolt head can be obtained. The existing square trimming die comprises a lower die and a trimming die, a screw is inserted into a die hole of the lower die, a supporting surface at the bottom of a square bolt head is supported by the top surface of the lower die, after the trimming die is stamped, the redundant part of the bolt head is cut off to form a regular square head, then an ejector pin is ejected upwards from the bottom of the die hole to demold the bolt. The disadvantages of such a mould are: burrs after trimming can remain on the edge of the supporting surface, and the burrs are easy to bend on the supporting surface to form a boss assembly, so that the assembly of the square bolt is influenced, and improvement is needed.

Disclosure of Invention

The utility model aims at overcoming not enough among the above-mentioned background art, provide a cubic bolt does not have burr side cut mould, can not form the burr when the punching press, guarantees the assembly precision of cubic bolt, still has simple structure, convenient to use's technical characterstic.

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

the utility model provides a square bolt does not have burr side cut mould, includes trimming die and lower mould, and the lower mould is seted up vertical nib and is used for holding the screw rod of bolt, and the lower part of nib is provided with the thimble, the top of nib is provided with a square counter bore, and the size of counter bore suits with the holding surface of square bolt.

Preferably, the depth of the counter bore is 0.2-0.3 mm.

Preferably, each edge of the counter bore is inwardly indented by 0.1-0.2 mm relative to the edge of the supporting surface.

Compared with the prior art, the utility model has the following advantage: the utility model discloses be provided with the counter bore on the lower mould, the edge of counter bore can cut the punching press and form the burr, avoids its influence holding surface, improves the assembly precision, and overall structure is simple, convenient to use.

Drawings

Fig. 1 is a structural schematic diagram of a square bolt burr-free trimming die.

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 fig. 1, a square bolt burr-free trimming die comprises a trimming die 1 and a lower die 2, wherein the lower die 2 is fixed on a rack (or a machine tool), the trimming die 1 is located above the lower die 2 and connected with a punching mechanism, the lower die 2 is provided with a vertical die hole (also called a positioning hole) for accommodating a screw rod of a bolt, a thimble 3 is arranged at the lower part of the die hole, and the thimble 3 is connected with a hydraulic mechanism and can stretch up and down to achieve the effect of demolding. The above structure is similar to the prior art and will not be described in detail herein.

The top of the die hole is provided with a square counter bore 4, and the shape and the size of the counter bore 4 are matched with the outer contour of the support surface of the square bolt (the support surface is the bottom surface of the bolt head). The depth of the counter bore 4 is 0.2-0.3 mm. And each edge of the counter bore 4 is inwardly retracted by 0.1-0.2 mm relative to the corresponding edge of the supporting surface.

The utility model discloses a theory of operation is: after the screw rod of bolt embryo spare inserted the nib, the holding surface pressed the top surface at the lower mould, and the back is gone down to the side cut mould, with unnecessary part excision, the burr of production can receive the shearing force at counter bore edge at the punching press in-process, and the burr can be cut off, can not influence the holding surface, cuts off the side cut and accomplishes the back, and the ejector pin is with the ejecting nib of screw rod.

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 square bolt does not have burr side cut mould, includes trimming die (1) and lower mould (2), sets up the screw rod that vertical nib is used for holding the bolt in lower mould (2), and the lower part in nib is provided with thimble (3), its characterized in that: the top of the die hole is provided with a square counter bore (4), and the size of the counter bore (4) is matched with the supporting surface of the square bolt.

2. The square bolt burr-free trimming die according to claim 1, wherein: the depth of the counter bore (4) is 0.2-0.3 mm.

3. The square bolt burr-free trimming die according to claim 1, wherein: and each edge of the counter bore (4) is inwardly retracted by 0.1-0.2 mm relative to the edge of the supporting surface.