CN215544631U

CN215544631U - Cold heading supporting head bolt die

Info

Publication number: CN215544631U
Application number: CN202121726385.1U
Authority: CN
Inventors: 蒋永峰; 吴志坚; 徐俭
Original assignee: Changshu City Standard Parts Factory Co ltd
Current assignee: Changshu City Standard Parts Factory Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-18
Anticipated expiration: 2031-07-28

Abstract

The utility model discloses a cold-heading support bolt die, which relates to the technical field of cold-heading process equipment and comprises an outer die, wherein the inner wall of the outer die is fixedly connected with an inner die, the left end of the inner die is provided with a first chamfer groove, the right end of the first chamfer groove of the inner die is provided with a second chamfer groove, the right end of the second chamfer groove of the inner die is provided with a thick rod part forming hole, and the right end of the thick rod part forming hole of the inner die is provided with a third chamfer groove; through the mode, the large chamfer is firstly subjected to cold heading through the third chamfer groove at the station before the support head, and the support head shrinking die is subjected to small-angle chamfering on the basis of the large chamfer, so that the stress is reduced during four-step cold heading, the bolts smoothly and uniformly enter the support head due to the guiding effect of the chamfer, and the die is not easy to be roughened and damaged.

Description

Cold heading supporting head bolt die

Technical Field

The utility model relates to the technical field of cold heading process equipment, in particular to a cold heading support bolt die.

Background

The flange bolt is an integral bolt consisting of a hexagon head, a flange plate (a gasket below the hexagon and the hexagon are fixed into a whole) and a screw (a cylinder with external threads), and is matched with a nut and used for fastening and connecting parts of two through holes. The flange bolt is used for protecting a round flange bolt of the branch head, a round flange bolt without the branch head and the like.

The round flange bolt M8 multiplied by 20 with the support head is produced by a cold heading process, the original cold heading bolts with the support heads are all formed by chamfering and reducing the support heads at one time, the reduction ratio of the common cold heading support heads is very large, a die (shown in figure 2) needs to chamfer and reduce the diameter at the same time during working, the stress of the die is large, and the die is often roughened and damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cold heading support bolt die to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a cold-heading back-head bolt mould, includes the external mold, the inner wall fixedly connected with centre form of external mold, first chamfer groove has been seted up to the left end of centre form, the second chamfer groove has been seted up at the right-hand member in first chamfer groove to the centre form, thick pole portion shaping hole has been seted up at the right-hand member in second chamfer groove to the centre form, third chamfer groove has been seted up at the right-hand member in thick pole portion shaping hole to the centre form, thin pole portion shaping hole has been seted up at the right-hand member in third chamfer groove to the centre form.

Further, the length of the outer die is 29 mm.

Further, the distance between the right end of the third chamfer groove and the left end of the inner die is 19.5 mm.

Furthermore, the chamfer angle of the third chamfer groove is 20 degrees, and the chamfer angle of the third chamfer groove is half of the inclination between the thin rod and the thick rod of the round flange bolt with the support head.

Further, the length of the third chamfer groove is 2 mm.

Furthermore, the outer die is made of 40cr alloy steel, and the hardness requirement of the outer die is as follows: HRC 44-48.

Furthermore, the inner mold is made of YG20C hard alloy.

Further, the inner diameter of the thick rod part forming hole is 7.08 mm.

Further, the diameter of the thin rod part forming hole is 6.35 mm.

The utility model has the beneficial effects that:

according to the utility model, at a station before the support head is contracted, a large chamfer is cold-headed through the third chamfer groove, and the support head mold is subjected to small-angle chamfering on the basis of the large chamfer, so that the stress is reduced during four-step cold heading work, and the bolts smoothly and uniformly enter the support head due to the guiding function of the chamfer, so that the mold is not easy to be roughened and damaged; when the round flange bolt M8 multiplied by 20 cold ends with the branch heads are used, the number of the contracted branch head moulds is changed by 2-3 originally one day, and one mould can be used for 2-3 days after the new process is changed, so that the efficiency is obviously improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a sectional view of a mold structure of a previous station of a round flange bolt reducing head with a supporting head according to the utility model;

FIG. 2 is a cross-sectional view of a cold-heading buttress bolt die of the present invention;

FIG. 3 is a sectional view of a structure of a mold for a branch point of the present invention;

FIG. 4 is a schematic structural view of a round flange bolt M8 × 20 with a support head according to the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1. the outer mold 2, the inner mold 3, the thin rod part forming hole 4, the third chamfer angle groove 5, the thick rod part forming hole 6, the first chamfer angle groove 7 and the second chamfer angle groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1, 2, 3 and 4, the cold heading bolt die comprises an outer die 1, wherein the outer die 1 is made of 40cr alloy steel, and the hardness requirement of the outer die 1 is as follows: HRC44-48, the length of the outer mold 1 is 29mm, the inner wall of the outer mold 1 is fixedly connected with an inner mold 2, the inner mold 2 is made of YG20C hard alloy, the left end of the inner mold 2 is provided with a first chamfer groove 6, the right end of the first chamfer groove 6 of the inner mold 2 is provided with a second chamfer groove 7, the right end of the second chamfer groove 7 of the inner mold 2 is provided with a thick rod part molding hole 5, the inner diameter of the thick rod part molding hole 5 is 7.08mm, the right end of the thick rod part molding hole 5 of the inner mold 2 is provided with a third chamfer groove 4, the distance from the right end of the third chamfer groove 4 to the left end of the inner mold 2 is 19.5mm, the chamfer angle of the third chamfer groove 4 is 20 degrees, the chamfer angle of the third chamfer groove 4 is half of the inclination between a thin rod and a thick rod of a round flange bolt with a supporting head, the length of the third chamfer groove 4 is 2mm, the right end of the third chamfer groove 4 is provided with a thin rod part 3, the diameter of the thin rod part forming hole 3 is 6.35mm, a large chamfer is firstly subjected to cold heading through a third chamfer groove 4 at a station before the support head is contracted, and a support head mould is subjected to small-angle chamfering on the basis of the large chamfer, so that the stress is reduced during four-step cold heading work, and the chamfer plays a role in guiding, so that bolts smoothly and uniformly enter the support head, and the mould is not easy to be napped and damaged; when the round flange bolt M8 multiplied by 20 cold ends with the branch heads are used, the number of the contracted branch head moulds is changed by 2-3 originally one day, and one mould can be used for 2-3 days after the new process is changed, so that the efficiency is obviously improved.

When the four-step cold heading machine is used, a large chamfer is firstly subjected to cold heading through the third chamfer groove 4 at a station before the support head is contracted, the thin rod part forming hole 3 is subjected to thin rod cold heading, the thick rod part forming hole 5 is subjected to thick rod cold end, the first chamfer groove 6 and the second chamfer groove 7 are used for chamfering the screw cap, and the support head mold figure 3 is subjected to small-angle chamfer on the basis of the large chamfer, so that the stress is reduced during four-step cold heading work, and the bolt smoothly and uniformly enters the support head due to the guiding function of the chamfer, and the mold is not easy to be scratched and damaged; when the round flange bolt M8 multiplied by 20 cold ends with the branch heads are used, the number of the contracted branch head moulds is changed by 2-3 originally one day, and one mould can be used for 2-3 days after the new process is changed, so that the efficiency is obviously improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not exhaustive and do not limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a cold-heading anchor bolt mould, includes external mold (1), its characterized in that: inner wall fixedly connected with centre form (2) of external mold (1), first chamfer groove (6) have been seted up to the left end of centre form (2), second chamfer groove (7) have been seted up at the right-hand member of first chamfer groove (6) in centre form (2), thick pole portion shaping hole (5) have been seted up at the right-hand member of second chamfer groove (7) in centre form (2), third chamfer groove (4) have been seted up at the right-hand member of thick pole portion shaping hole (5) in centre form (2), thin pole portion shaping hole (3) have been seted up at the right-hand member of third chamfer groove (4) in centre form (2).

2. The cold-heading bolt die of claim 1, wherein: the length of the outer die (1) is 29 mm.

3. The cold-heading bolt die of claim 2, wherein: the distance between the right end of the third chamfer groove (4) and the left end of the inner die (2) is 19.5 mm.

4. The cold-heading bolt die of claim 3, wherein: the chamfering angle of the third chamfering groove (4) is 20 degrees, and the chamfering angle of the third chamfering groove (4) is half of the inclination between the thin rod and the thick rod of the round flange bolt with the supporting head.

5. The cold-heading bolt die of claim 4, wherein: the length of the third chamfer groove (4) is 2 mm.

6. The cold-heading bolt die of claim 5, wherein: the external mold (1) is made of 40cr alloy steel, and the hardness requirement of the external mold (1) is as follows: HRC 44-48.

7. The cold-heading bolt die of claim 6, wherein: the inner die (2) is made of YG20C hard alloy.

8. The cold-heading bolt die of claim 7, wherein: the inner diameter of the thick rod part forming hole (5) is 7.08 mm.

9. The cold-heading bolt die of claim 8, wherein: the diameter of the thin rod part forming hole (3) is 6.35 mm.