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Machining process for high strength bolts

A technology of high-strength bolts and processing technology, applied in the field of bolt processing, can solve problems such as low tensile strength, achieve the effect of improving quality, improving strength and mechanical properties, and improving tensile strength

Inactive Publication Date: 2019-03-15
温州市鸿图汽车零部件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcoming of low tensile strength in the prior art, and propose a processing technology for high-strength bolts

Method used

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  • Machining process for high strength bolts

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0025] refer to figure 1 , a processing technology for high-strength bolts, comprising the following steps;

[0026] Step 1: Raw material processing, select special alloy steel as raw material, wherein, the content of carbon is 0.25% to 0.55%, the content of manganese is 0.4% to 0.8%, the content of silicon is 0.3%, and the content of sulfur is less than or equal to 0.035 %,; the content of phosphorus is less than or equal to 0.03%, and the content of boron is less than or equal to 0.005%;

[0027] Step 2: Spheroidizing annealing, heating the alloy material in a furnace, the heating temperature should be guaranteed to be at the upper and lower temperatures of the cr...

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Abstract

The invention relates to the technical field of bolt machining, in particular to a machining process for high strength bolts. The bolts are machined through the steps of raw material processing, spheroidizing annealing, peeling and descaling, drawing, cold forging forming, thread processing and heat treatment, the carbon content is reduced, the quality of cold forming is effectively improved, andthe manganese content is properly improved, so that the permeability of a steel is improved without affecting the cold forming performance of the steel; and in the spheroidizing annealing process, themode of first cooling, then isothermal treatment, and then cooling is adopted, therefore, the cracking rate of cold heading is reduced, the tensile strength of the finished bolts is increased, and the practical applicability is high.

Description

technical field [0001] The invention relates to the technical field of bolt processing, in particular to a processing technology for high-strength bolts. Background technique [0002] A bolt is a mechanical part, a cylindrical threaded fastener with a nut, a type of fastener consisting of a head and a screw (a cylinder with external threads), which needs to be matched with a nut. It is used to fasten two parts with through holes. This connection form is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated. Therefore, the bolt connection is a detachable connection. The force bearing methods are divided into ordinary and hinged holes. According to the shape of the head, it is divided into hexagonal head, round head, square head, countersunk head, etc. Among them, the hexagonal head is the most commonly used. The countersunk head is used in places where connection is required. Bolts are indispensable in daily life and industrial product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D1/32C21D9/00C22C38/02C22C38/04
CPCB23P15/00C21D1/32C21D9/0093C22C38/002C22C38/02C22C38/04Y02P10/20
Inventor 张德池刘红祥卢华
Owner 温州市鸿图汽车零部件有限公司