Manufacturing process for high-strength square U-shaped bolts

A manufacturing process and high-strength technology, applied in the field of mechanical processing, can solve the problems of high cost and low processing efficiency of high-strength square U-shaped bolts, and achieve the effects of saving costs, optimizing the manufacturing process, and reducing labor intensity

Active Publication Date: 2019-11-12
SHANXI NORTH MACHINE BUILDING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the limitations of the prior art, solve the problems of low processing efficiency and high cost of high-strength square U-shaped bolts, and propose a manufacturing process for high-strength square U-shaped bolts

Method used

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  • Manufacturing process for high-strength square U-shaped bolts
  • Manufacturing process for high-strength square U-shaped bolts
  • Manufacturing process for high-strength square U-shaped bolts

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Embodiment Construction

[0017] The manufacturing process of the present invention will be described in detail below in conjunction with specific embodiments.

[0018] The following takes the 40Cr material of the curved inner angle R10 as an example to illustrate a high-strength square U-shaped bolt manufacturing process. The inventive method comprises the following steps:

[0019] (1) Car threading, this step can be processed according to the drawings by using a common lathe, and the problem of high labor intensity, low processing efficiency and high manufacturing cost of the operator in the tapping process of using special tools in the existing method can be effectively solved by this step;

[0020] (2) heating and bending;

[0021] In this step, the existing bending forming method can be used to bend the part into a square U shape meeting the specification requirements;

[0022] Preferably, the following process can be used to achieve: on both sides of the corner center of the part Range heating...

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Abstract

The invention relates to a manufacturing process for high-strength square U-shaped bolts, and belongs to the technical field of mechanical processing. The manufacturing process comprises the steps ofthread lathing and heating bending forming and non-oxidizing heat treatment processes. In the heating bending forming process, the scopes of the two sides of the center of a bending corner of a part are heated, wherein R is the bending inner corner radius, d is the bolt diameter, and A is the elongation of a material of the part; the heating temperature of the part is controlled to be within the range from (Ac3+30 DEG C) to (Ac3+100 DEG C), wherein Ac3 is the austenite phase change temperature of the material of the part; the bending forming time is controlled to be within the range of K*d seconds under the condition that it is ensured that the bending corner does not deform, wherein K is equal to 1 to 1.3; and the cooling rate is controlled to be 80 DEG C / h-120 DEG C / h. Compared with theprior art, the manufacturing process for the high-strength square U-shaped bolts is optimized, the processing efficiency of the high-strength square U-shaped bolts is improved, the labor intensity ofan operator is reduced, use of a special hard alloy manual threading die is not needed, and cost is saved.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a manufacturing process of high-strength square U-shaped bolts. Background technique [0002] The high-strength square U-shaped bolt is a locking device for connecting the main beam and the sub-beam of a certain product chassis of our company (such as figure 1 As shown), the function is to prevent the vehicle from being deformed and broken under the conditions of turning, load, etc., and a high-strength square U-bolt is required. Due to the particularity of the structure and shape of the locked parts, the square U-bolt needs to be designed R10 bending over-arc, but it will increase the difficulty of manufacturing high-strength square U-shaped bolts and the risk of cracking at the bend. [0003] In order to achieve high strength requirements, the selected square U-bolt material must be high-strength structural steel, and it must undergo heat treatment to achieve the r...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21D7/024B21D7/16
CPCB21D7/024B21D7/162B23P15/00
Inventor 郭俊文张利军李旭军杨继锋孔繁启张进高嘉鹏胡丽娟张曙娟祁小晶武德李子青刘雨果
Owner SHANXI NORTH MACHINE BUILDING
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