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Bolt heat treatment process

A bolt and process technology, applied in the field of bolt heat treatment technology, can solve the problems of deepening decarburization layer of raw materials, failure of threaded fasteners, shortening service life, etc., and achieve the effect of high surface hardness

Inactive Publication Date: 2016-11-16
NINGBO JINDING FASTENING PIECE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decarburization of the thread will cause the fastener to trip first when the resistance force required by the mechanical properties is not met, which will make the threaded fastener invalid and shorten the service life
Due to the decarburization of the raw material, if the annealing is improper, the decarburization layer of the raw material will be deepened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0011] Embodiment 2: Bolt heat treatment process, characterized in that it includes the following steps: 1) Ultrasonic equipment is used to ultrasonically clean the bolts to remove oil stains on the surface, and then dry the bolts after the oil stains are removed; 2) Put the bolts into a preheating furnace Preheat for 6 hours, and the temperature of the preheating furnace is 750°C; 3) Place the bolts in step 2 in a salt bath furnace at 720°C for 5 hours for quenching; 4) Put the bolts in step 3 at a temperature of 220°C Temper under conditions, and then keep warm for 50 minutes; then keep warm in a tempering furnace at 400°C for 12 hours and then air cool to room temperature; 5) Phosphate the surface of the bolts in step 4.

Embodiment 3

[0012] Embodiment 3: Bolt heat treatment process, which is characterized in that it includes the following steps: 1) Ultrasonic equipment is used to ultrasonically clean the bolts to remove oil stains on the surface, and then dry the bolts after the oil stains are removed; 2) Put the bolts into a preheating furnace Preheat for 5 hours, and the temperature of the preheating furnace is 600°C; 3) Place the bolts in step 2 in a salt bath furnace at 710°C for 4 hours for quenching; 4) Put the bolts in step 3 in a temperature of 1200°C Temper under conditions, and then keep warm for 40 minutes; then keep warm in a tempering furnace at 380°C for 11 hours and then air cool to room temperature; 5) Phosphate the surface of the bolts in step 4.

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PUM

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Abstract

The invention discloses a bolt heat treatment process which comprises the following steps: 1) carrying out ultrasonic cleaning on a bolt by adopting ultrasonic equipment to remove oil pollution on the surface, and then drying the bolt after oil pollution removal; 2) putting the bolt in a preheating furnace, and preheating for 4-6h, wherein the temperature of the preheating furnace is 500-750 DEG C; 3) placing the bolt obtained in the second step into a salt bath furnace with the temperature to be 700-720 DEG C, carrying out heat insulation for 3-5h, and quenching; 4) carrying out tempering on the bolt obtained in the third step at the temperature of 190-220 DEG C, then carrying out heat insulation for 30-50min, then carrying out heat insulation for 10-12h in a tempering furnace with the temperature to be 350-400 DEG C, and air cooling to the room temperature; and 5) carrying out surface phosphating treatment on the bolt obtained in the fourth step. According to the bolt heat treatment process, the bolt after being treated is very high in surface hardness.

Description

technical field [0001] The invention relates to the field of fasteners, and more specifically, to a bolt heat treatment process. Background technique [0002] High-strength fasteners must be quenched and tempered according to the relevant technical requirements. Heat treatment quenching and tempering is to improve the comprehensive mechanical properties of fasteners to meet the specified tensile strength value and yield ratio of the product. [0003] The heat treatment process has a crucial influence on high-strength fasteners, especially its intrinsic quality. Therefore, in order to produce high-quality high-strength fasteners, advanced heat treatment technology and equipment are necessary. [0004] Because high-strength bolts have a large production volume and low price, and the threaded part is a relatively fine and precise structure, heat treatment equipment is required to have large production capacity, high degree of automation, and good heat treatment quality. High-...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/46C21D9/00C23F17/00
CPCC21D9/0093C21D1/18C21D1/46C23F17/00
Inventor 胡伦波
Owner NINGBO JINDING FASTENING PIECE
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