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Forming process of fastener

A forming process and fastener technology, applied in the field of forming process of fasteners, can solve problems such as increased stress and strain, low yield, severe deformation, etc., achieve stress and strain reduction, small processing damage, and reduce wire deformation Effect

Active Publication Date: 2020-12-22
ZHEJIANG QIANGLI FASTENER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when using continuous multi-step cold forming technology to manufacture heat-resistant steel bolts, due to severe deformation, stress and strain increase, it is easy to cause work hardening, resulting in significant cold hardening characteristics of the material, and cold heading forming is easy to crack, resulting in The yield rate is low and needs to be improved

Method used

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  • Forming process of fastener

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] A forming process for fasteners, comprising the steps of:

[0043]S1, material selection, according to the processing size of the fastener product, select the appropriate wire as the raw material for the fastener forming;

[0044] S2, heat treatment, after continuously heating the heating furnace to 900-920°C, place the raw materials in the heating furnace and keep warm for 30-40min; then keep the temperature constant, continue to feed methanol and propane into the heating furnace, keep warm for 390-410min , do carburizing treatment; then take the raw materials out of the heating furnace, oil-cool the raw materials, cool the heating furnace to 180-200°C, put the raw materials into the heating furnace, keep warm for 170-190min, and do tempering treatment;

[0045] S3, pickling, first use the sulfuric acid solution with a concentration of 18% to pickle ...

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Abstract

The invention discloses a forming process of a fastener. The forming process comprises the following steps of S1, material selection; S2, heat treatment; S3, acid pickling; S4, drying; S5, copper plating; S6, wire drawing; S7, cold heading; S8, finish machining; S9, cleaning; S10, drying is conducted; and S11, detecting package. The forming process of the fastener has the following advantages andeffects that raw materials are subjected to performance treatment at first so that when the fastener is machined, wire deformation can be reduced, lattice distortion is reduced, stress and strain arealso reduced, work hardening is lowered, it is guaranteed that the fastener is not prone to cracking in the cold heading forming process, and therefore the product quality is guaranteed; and meanwhile, wire machining damage is small, product quality is improved, and cost is reduced.

Description

technical field [0001] The invention relates to the field of fastener production, in particular to a forming process of fasteners. Background technique [0002] Fasteners are also called standard parts in the market, which is a general term for a type of mechanical parts used when two or more parts or components are fastened and connected into a whole. [0003] As the service temperature of various power devices and some high-reliability devices used in transportation, shipping, aviation, nuclear power and other industries continues to rise, higher high-temperature service performance of bolts used to connect various high-temperature components is also proposed. Require. [0004] In the prior art, when using continuous multi-step cold forming technology to manufacture heat-resistant steel bolts, due to severe deformation, stress and strain increase, it is easy to cause work hardening, resulting in significant cold hardening characteristics of the material, and cold heading ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 钱成森
Owner ZHEJIANG QIANGLI FASTENER CO LTD
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