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A bar stock manufacturing process for fasteners

A manufacturing process and fastener technology, applied in the field of bar material manufacturing process of fasteners

Active Publication Date: 2020-12-08
SHANGHAI QUNLI FASTENER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem that the existing round bars are difficult to be used for mass production of non-standard parts, the purpose of the present invention is to provide a bar manufacturing process for fasteners, which improves the raw materials provided by the existing steel mills through the process to facilitate manufacturing Produce M20 bolts with tensile strength greater than 880Mpa

Method used

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  • A bar stock manufacturing process for fasteners

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Embodiment Construction

[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0059] A bar stock manufacturing process for fasteners such as figure 1 shown, including the following steps:

[0060] S1, cut 15% of the head and 5% of the tail of the 304 round bar with a diameter of 22mm, and complete the blanking;

[0061] S2, re-heat-treat the original round bar, and change the solution temperature to 1050±10°C; specifically include the following steps:

[0062] S21, starting to heat up the disc and blank the material at a temperature not lower than 600°C;

[0063] S22, after the disc blanking is heated to 1050±10°C, it is kept at this temperature for 1.5~2h;

[0064] S23, oil-cooled or water-cooled, the disc blanking is cooled to below 30°C within 2-3 minutes.

[0065] S3, the first annealing treatment; specifically includes the following steps:

[0066] S31, starting to heat up the disc and blank the material at a temperature not ...

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Abstract

The invention discloses a bar manufacturing process for a fastener, and relates to the technical field of fastener manufacturing. The bar manufacturing process comprises the following steps: S1, blanking 304 coiled bar materials with the diameter of 22 mm; S2, carrying out heat treatment again, wherein the solid solution temperature is 1050 + / -10 DEG C; S3, annealing for the first time; S4, drawing wire, and drawing the coiled bar material to 21 mm in diameter; S5, carrying out secondary annealing treatment; and S6, drawing wire, and drawing the coiled bar material to 18.46 + / -0.3 mm in diameter. Aiming at the problem that the existing coiled bar material is difficult to be used for producing non-standard parts in batches, the coiled bar material is subjected to solid solution again, and the solid solution temperature is changed, so that the material characteristics of the coiled bar material can meet the requirement of processing non-standard bolts.

Description

technical field [0001] The invention relates to the technical field of fastener manufacturing, more specifically, it relates to a bar material manufacturing process for fasteners. Background technique [0002] At present, the steel produced by Baosteel, Yongxing, Qingshan, and Northeast are 304 stainless steel discs, solid solution at 1200°C, and their material strength is 565-585Mpa. After cold work hardening, the resistance The tensile strength can only reach 861Mpa. [0003] However, in the non-standard fastener industry, for some special fields, such as food, medicine, aviation, nuclear energy, high-speed rail, etc., M20 bolts (with a diameter of 18.46mm) are required to have a tensile strength greater than 880Mpa. [0004] In the prior art, there are several schemes as follows: [0005] A, using 304 stainless steel discs with a diameter of 21mm, annealed twice and drawn twice to 18.46mm, the tensile strength of the finished product can only reach 800Mpa at most, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04C21D8/06
CPCB21C37/04C21D8/065
Inventor 陆优明
Owner SHANGHAI QUNLI FASTENER MFG