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Warm upsetting composite forming process for high-strength fastener

A composite molding and fastener technology, applied in the direction of furnace types, manufacturing tools, metal processing equipment, etc., can solve the problems of relatively high stamping pressure requirements for molding equipment, high mold strength requirements, and increased production costs. Structural performance, dimensional stability, good effect of metal streamline

Pending Publication Date: 2021-10-15
ANHUI CHANGJIANG FASTENERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, fasteners such as bolts are generally formed by cold heading or hot heading technology, because metal materials are easy to expand when heated at higher temperatures; forming at room temperature not only requires higher strength of the mold, but also The stamping pressure requirements for forming equipment are also relatively high, resulting in expensive equipment costs and increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A warm upsetting composite forming process for high-strength fasteners, comprising the following steps;

[0029] S1. Cutting: According to the specifications of the fasteners, cut the appropriate steel length and diameter to obtain metal bars for fasteners. The hardness of the steel used for the bars is 120HV, and the lower process can only be entered after passing the inspection;

[0030] S2. Double-head flat-head machine flat-head: put the bar processed in S1 into the double-head flat-head machine for initial processing, so that both ends of the bar are polished without burrs;

[0031] S3. Automatic induction coil heating: Put the pre-processed bar in S2 into the automatic induction coil to heat, so that the bar is heated to a suitable temperature for upsetting, and the bar after initial processing is heated to a temperature of 500°C. , the temperature rise rate is 30°C / min, and then keep warm for 30 minutes;

[0032] S4. Warm upsetting forming: put the bar heated in...

Embodiment 2

[0037] A warm upsetting composite forming process for high-strength fasteners, comprising the following steps:

[0038] S1. Blanking: According to the specifications of the fasteners, cut the appropriate steel length and diameter to obtain metal bars for fasteners. The hardness of the steel used for the bars is 130HV, and the lower process can only be entered after passing the inspection;

[0039] S2. Double-head flat-head machine flat-head: put the bar processed in S1 into the double-head flat-head machine for initial processing, so that both ends of the bar are polished without burrs;

[0040] S3. Automatic induction coil heating: Put the pre-processed bar in S2 into the automatic induction coil to heat, so that the bar is heated to a suitable temperature for upsetting, and the bar after initial processing is heated to a temperature of 750°C. , the temperature rise rate is 36°C / min, and then keep warm for 45 minutes;

[0041] S4. Warm upsetting forming: put the bar heated i...

Embodiment 3

[0046] A warm upsetting composite forming process for high-strength fasteners, comprising the following steps:

[0047] S1. Blanking: According to the specifications of the fastener, cut the appropriate steel length and diameter to obtain the metal bar for the fastener. The hardness of the steel used for the bar is 125HV, and the lower process can only be entered after passing the inspection;

[0048]S2. Double-head flat-head machine flat-head: put the bar processed in S1 into the double-head flat-head machine for initial processing, so that both ends of the bar are polished without burrs;

[0049] S3. Automatic induction coil heating: Put the pre-processed bar in S2 into the automatic induction coil to heat, so that the bar is heated to a suitable temperature for upsetting, and the bar after initial processing is heated to a temperature of 600°C. , the temperature rise rate is 33°C / min, and then keep warm for 38 minutes;

[0050] S4. Warm upsetting forming: put the bar heate...

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Abstract

The invention relates to the technical field of fastener machining, and discloses a warm upsetting composite forming process for a high-strength fastener. The method comprises the following steps: S1, blanking; S2, head smoothing by a double-head smoothing machine; S3, automatic induction coil heating; S4, warm upsetting forming; S5, thread rolling; S6, heat treatment; and S7, surface treatment. According to the warm upsetting composite forming process, the requirement for stamping strength can be effectively lowered, the machining turning process is not needed, the technology steps are greatly simplified, and the production cost is obviously lowered; and the fastener is sequentially subjected to heat treatment and surface treatment, the structural performance of a nut is guaranteed, a formed bolt is stable in size and small in volume change rate, the precision of cold upsetting forming can be reserved, the heating temperature is higher than the blue brittleness temperature, hot working plasticity is achieved, the metal streamline is good, and the product size precision can be controlled to be + / -0.2 mm.

Description

technical field [0001] The invention relates to the technical field of fastener processing, in particular to a high-strength fastener warm upsetting composite forming process. Background technique [0002] In the current industrial production and daily life, the use of fasteners is very common. Fasteners are used for fastening connections and are widely used in mechanical parts in various fields such as machinery, electricity, automobiles, transportation, aerospace, etc. . A bolt is a cylindrical threaded fastener with a nut. It consists of a head and a screw. It cooperates with the nut to fasten and connect two parts with through holes. With the development of the economy, the manufacturing standards of bolts and other fasteners have gradually been in line with national standards, which puts forward higher requirements for the manufacture of bolts and other fasteners. [0003] At present, fasteners such as bolts are generally formed by cold heading or hot heading technolo...

Claims

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Application Information

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IPC IPC(8): B21J5/08B21J5/02B21J17/00C21D9/00C25D7/00
CPCB21J5/08B21J5/02B21J17/00C21D9/0068C21D9/0093C25D7/00
Inventor 杨照军
Owner ANHUI CHANGJIANG FASTENERS