Unlock instant, AI-driven research and patent intelligence for your innovation.

Bolt large chamfer cold heading die and technology

A bolt and chamfering technology, applied in manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve the problem of increasing bolt processing time and production cost, ugly and irregular shape of chamfer, and length of bolt shank. Shortening and other problems, to achieve the effect of prolonging the life, eliminating the turning process, and reducing the probability of abnormal deformation

Active Publication Date: 2020-09-25
CHONGQING STANDARD FASTNERS IND CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the large chamfer of the thread end is usually realized by secondary turning after the bolt is cold heading, but this will increase the process and increase the time and production cost of the bolt processing
If you do not use turning processing, you will encounter many problems if you directly chamfer the bolts. For example, it will fail due to excessive chamfering. The shape of the corners is also ugly and irregular, and may even cause damage to the mold

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bolt large chamfer cold heading die and technology
  • Bolt large chamfer cold heading die and technology
  • Bolt large chamfer cold heading die and technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking M12 hexagonal flange bolts as an example, in the first chamfering in the third sequence, the main mold used (such as figure 2 shown) and the main mold used in the three sequences of the traditional production process (such as image 3 As shown), the first chamfering part is added after the reduced-diameter extrusion part, the chamfering angle of the first chamfering part is 45°, and the inner diameter of the mold at the end of the first chamfering part is 9mm.

[0027] In the second chamfering in the fourth sequence, the main mold used (such as Figure 4 Shown) and the main model used in the four sequences of traditional production technology (such as Figure 5 As shown), a second chamfering portion is added after the extrusion portion, the chamfering angle of the second chamfering portion is 45°, and the inner diameter of the mold at the end of the second chamfering portion is 7mm. The inner diameter of the mold at the end of the second chamfer corresponds to...

Embodiment 2

[0029] Taking M12 hexagonal flange bolts as an example, in the first chamfering in the third sequence, the main mold used (such as figure 2 shown) and the main mold used in the three sequences of the traditional production process (such as image 3 As shown), the first chamfering part is added after the reduced-diameter extrusion part, the chamfering angle of the first chamfering part is 60°, and the inner diameter of the mold at the end of the first chamfering part is 8.5 mm.

[0030] In the second chamfering in the fourth sequence, the main mold used (such as Figure 4 Shown) and the main model used in the four sequences of traditional production technology (such as Figure 5 As shown), a second chamfering portion is added after the extrusion portion, the chamfering angle of the second chamfering portion is 45°, and the inner diameter of the mold at the end of the second chamfering portion is 7mm. The inner diameter of the mold at the end of the second chamfer corresponds...

Embodiment 3

[0032] Taking M12 hexagonal flange bolts as an example, in the first chamfering in the third sequence, the main mold used (such as figure 2 shown) and the main mold used in the three sequences of the traditional production process (such as image 3 As shown), the first chamfering part is added after the reduced-diameter extrusion part, the chamfering angle of the first chamfering part is 45°, and the inner diameter of the mold at the end of the first chamfering part is 9.5 mm.

[0033] In the second chamfering in the fourth sequence, the main mold used (such as Figure 4 Shown) and the main model used in the four sequences of traditional production technology (such as Figure 5As shown), a second chamfering portion is added after the extrusion portion, the chamfering angle of the second chamfering portion is 45°, and the inner diameter of the mold at the end of the second chamfering portion is 7mm. The inner diameter of the mold at the end of the second chamfer corresponds ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a bolt large chamfering cold heading die and process. The bolt large chamfering cold heading die comprises a main die A and a main die B. The process of the main die A precedesthe main die B, and through holes are separately formed in the middle portions of the main die A and the main die B. The through holes each include a molding cavity on the front side and an ejector rod accommodating cavity on the rear side. A first chamfering portion is disposed between the molding cavity and the ejector rod accommodating cavity of the main die A, and a second chamfering portionis disposed between the molding cavity and the ejector rod accommodating cavity of the main die B. The inner diameter of the die at the tail end of the second chamfering portion is not less than 50% of the nominal diameter of a bolt, and the inner diameter of the die at the tail end of the first chamfering portion is 40%-50% of the sum of the inner diameter of the tail end of the second chamferingportion and the nominal diameter of the bolt. The bolt large chamfering cold heading die and process realize a large chamfering structure by two-stage chamfering, can eliminate the turning process, avoid the length change of the rod portion of the bolt, avoid the die damage, and save time and production cost.

Description

technical field [0001] The invention belongs to the technical field of bolt processing, and in particular relates to a bolt large chamfering cold heading die and a process. Background technique [0002] Standard bolt thread end chamfers are all in accordance with the requirements of GB / T 2, and the thread end chamfers are relatively small, which can be formed by cold heading at one time. With the development of technology, in order to facilitate the assembly of parts and better guide, it is necessary to increase the chamfer of the thread end of the bolt, and design the chamfer of the thread end to be at least 2 times (usually about 3 times) larger than the original horn. In the prior art, the large chamfer of the threaded end is usually realized by secondary turning after the bolt is cold heading, but this will increase the process and increase the time and production cost of the bolt processing. If you do not use turning processing, you will encounter many problems if you...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21J13/02B21J13/14
CPCB21J13/02B21J13/14
Inventor 但红旭刘峰
Owner CHONGQING STANDARD FASTNERS IND CO LTD