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Bolt machining technology

A processing technology and bolt technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of low nut matching rate, scrap rate exceeding 10%, large deformation rate, etc., and achieve simple processing technology and qualified rate of finished products high effect

Inactive Publication Date: 2015-05-20
XIAN FURST POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-strength nuts that require high strength, the current heat treatment process is carburizing or cyanide + quenching and tempering, and a complete annealing process of 850-900 ° C for 10 hours, but the bolts produced by this process are quenched. When the section shrinkage rate is large, the deformation rate is large, the matching rate with the nut is low, and the scrap rate sometimes exceeds 10%

Method used

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Embodiment Construction

[0014] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further elaborated.

[0015] A kind of bolt processing technology, comprises the following steps:

[0016] Cold heading process: cutting the wire, heading into a screw blank, forming the head, cross groove (or other head shape), thread blank diameter and rod length, and rounded corners under the head;

[0017] Thread rolling process: rub out the thread from the cold heading blank;

[0018] Heat treatment: quench the bolts with quenching oil at 800°C±10°C, and then temper the quenched bolts twice.

[0019] Then carry out carburizing treatment, send the carburizing agent into the tempering furnace, and perform carburizing treatment in the temperature range of 1100°-1150°C for 50-120min.

[0020] Finally, wash and air-dry to get the finished bolt.

[0021] In a preferred embodiment of the present invention, the te...

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PUM

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Abstract

The invention discloses a bolt machining technology. The technology comprises the following steps of a cold heading working procedure, wherein a wire rod is cut off, and is headed into a screw blank, and a head portion, cross recess (or other head styles) thread billet diameters and rod lengths, and head lower fillets are formed; a thread rolling working procedure, wherein threads are rolled out of the cold-heading blank; heat treatment, wherein, a bolt is quenched by quenching oil at the temperature of 800 DEG C+ / -10 DEG C, and two-time tempering is carried out on the quenched bolt; carburizing treatment, wherein a carburizing agent is conveyed to a tempering furnace, and carburizing treatment is carried out for 50 minutes to 120 minutes at the temperature ranging from 1100 DEG C to 1150 DEG C; and finally, cleaning and air drying are carried out, and the finished bolt is obtained. The machining technology is simple, and two-time tempering is carried out on the quenched bolt; and the qualified rate of the finished product is high.

Description

technical field [0001] The invention relates to the field of bolts for transmission devices, in particular to a bolt processing technology. Background technique [0002] The bolt production method in the prior art includes production processes such as plate element, annealing, pickling, wire drawing, forming, tapping, heat treatment, and surface treatment. For high-strength nuts that require high strength, the current heat treatment process is carburizing or cyanide + quenching and tempering, and a complete annealing process of 850-900 ° C for 10 hours, but the bolts produced by this process are quenched. When the shrinkage rate of the section is large, the deformation rate is large, the matching rate with the nut is low, and the scrap rate sometimes exceeds 10%. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bolt processing technology, the processing technology is simple, and the quenched or bolts are temper...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00F16B35/00
Inventor 王燕
Owner XIAN FURST POWER TECH