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A kind of softening and annealing process method of copper sealing gasket

A sealing gasket and softening annealing technology, which is applied in the field of softening annealing heat treatment process, can solve the problems of lower hardness, out-of-tolerance, and failure to meet HV45 hardness requirements, and achieve the effect of avoiding surface oxidation and improving surface quality

Active Publication Date: 2020-07-14
西安长峰机电研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After conventional annealing, the hardness of the sealing gasket is uneven, and the upper limit of the hardness is not required, and even the phenomenon of out-of-tolerance occurs, which does not meet the hardness requirement of HV45, and the pass rate of the furnace is about 70%.
After analysis, the commonly used red copper drawn rods with specifications of Φ10mm~Φ60mm are different in raw material composition and deformation degree during production, and the internal structure and work hardening state of sealing gaskets of different sizes after subsequent processing are different. Annealing according to conventional annealing methods cannot Fully achieve the purpose of adjusting tissue, eliminating residual stress and reducing hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Φ13×Φ10×1.5 washers made of Φ16 T2M red copper bars by CNC turning, hardness requirements: HV30~HV45. Clean it with gasoline and dry it in the air, put it into a vacuum furnace, and evacuate it to 1.33Pa; heat up at a rate of 252°C / h (from room temperature 20°C to 650°C takes 150min), and keep it at 650°C for 120min; Cool down to 70°C with the furnace, then air cool to room temperature. Hardness test result: HV37~HV42.

Embodiment 2

[0024] Φ26×Φ22×2 washers made of Φ30 T2M red copper bars by numerical control, hardness requirements: HV30~HV40. Clean it with gasoline and dry it, put it into a vacuum furnace, and evacuate it to 1.33Pa; heat up at a rate of 300°C / h (125min from room temperature to 650°C), and keep it at 650°C for 120min; Cool down to 95°C with the furnace, then air cool to room temperature. Hardness test result: HV38~HV42. According to the above steps, repeat the treatment once, the hardness test result: HV35~HV38.5.

Embodiment 3

[0026] Φ52×Φ48×2 washers made of Φ60 T2M red copper bar by CNC turning, hardness requirement: HV30~HV40. Clean it with gasoline and dry it in the air, put it into a vacuum furnace, and evacuate it to 1.33Pa; heat up at a rate of 234°C / h (from room temperature 25°C to 650°C takes 160min), and keep it at 650°C for 120min; Cool down to 90°C with the furnace, then air cool to room temperature. Hardness test result: HV32~HV36.

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Abstract

The invention provides a red copper sealing washer softening annealing technology method. The red copper sealing washer softening annealing technology method comprises the steps that a red copper sealing washer is cleaned with gasoline, air-dried and put into a vacuum furnace, and the vacuum furnace is vacuumized till the vacuum degree is 1.33-13.3 Pa; heating is conducted for temperature rising,and the temperature rising speed is controlled to be 180-300 DEG C / h; the heat preservation time is 90-150 min after the temperature reaches 600-650 DEG C; and then furnace cooling is conducted, and the red copper sealing washer is taken out of the furnace at any temperature below 100 DEG C and then air-cooled to the room temperature. According to the red copper sealing washer softening annealingtechnology method, the surface Vickers hardness is not higher than HV45 after the red copper sealing washer is annealed, the problem that the hardness is slightly high in conventional annealing is solved, and the first time pass rate of a softening annealing furnace is increased.

Description

technical field [0001] The invention relates to a softening annealing heat treatment process. Background technique [0002] Copper has excellent electrical conductivity, thermal conductivity, plasticity and good corrosion resistance, and is widely used in industries such as electronic instruments and high-pressure vessels. In industrial production, the surface hardness requirements of copper parts are relatively strict. As a copper sealing gasket for fastening and sealing, the sealing principle is that the joint surface of the two parts squeezes and deforms the copper sealing gasket, so that the two planes of the copper sealing gasket closely fit the joint surfaces of the two parts. Therefore, it is generally required that the Vickers hardness on the surface of the copper gasket is not higher than HV45. [0003] Sealing gaskets formed by machining are generally recrystallized and annealed before use to eliminate residual stress, eliminate work hardening, and soften them to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/02C22F1/08
CPCC22F1/02C22F1/08
Inventor 张志正郑淑丽杨立合雷超郭刚
Owner 西安长峰机电研究所
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