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Hardening and tempering method in pump body manufacturing

A pump body, quenching and tempering technology, used in manufacturing tools, heat treatment equipment, quenching agents, etc., can solve the problems of poor pump body performance, poor safety, high labor intensity, etc., to overcome the problem of easy cracking in water cooling and high safety. , the effect of reducing labor intensity

Inactive Publication Date: 2010-11-24
JINXI IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, to solve the problems of poor performance of the pump body due to the tempering process, poor safety and high labor intensity in the tempering process, and to propose a new tempering method

Method used

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Embodiment

[0024] The method of the present invention will be described in detail below by taking the quenching and tempering of a pump body made of 30CrNi2MoVA as an example.

[0025] First, normalize the pump body. During treatment, the heating temperature is controlled at 950±10°C, preferably 950°C. Carry out insulation treatment after heating is completed.

[0026] After normalizing, use air cooling to cool down to below 200°C. Then, quenching treatment is performed. During processing, the temperature is controlled at 940±10°C, preferably 940°C. When quenching, use "trinitrate" as the medium, that is, a mixed solution composed of 25% sodium nitrate, 20% sodium nitrite, 20% potassium nitrate and 35% water by weight, and the temperature of the mixed solution should be Control at 30°C-70°C, preferably at 33°C.

[0027] After the quenching is completed, clean the surface of the pump body to remove the residual "trinitrate" solution on the surface. When cleaning, the water temperatu...

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Abstract

The invention discloses a hardening and tempering method in pump body manufacturing, and belongs to the technical field of pump body machining and manufacturing. The method comprises the processes of normalizing, hardening, primary high-temperature tempering, secondary high-temperature tempering and medium-temperature tempering, namely two-time high-temperature tempering and once medium-temperature tempering are performed after hardening. Simultaneously, sodium nitrate, sodium nitrate and potassium nitrate serve as a medium, namely a mixed solution consisting of 25 weight percent of the sodium nitrate, 20 weight percent of the sodium nitrite, 20 weight percent of the potassium nitrate and 35 weight percent of water, so as to improve the hardenability of a product, and simultaneously reduce a surface pulling stress to be crucially effective in stopping hardening cracks. The method of the invention effectively improves an impact value of a pump body at the temperature of -40 DEG C and the mechanical property of the pump body, has high safety in a hardening and tempering processes, improves working environment and reduces the labor intensity of production staff.

Description

technical field [0001] The invention belongs to the technical field of pump body processing and manufacturing, and relates to a quenching and tempering process in the pump body manufacturing process. Background technique [0002] The pump body is a kind of equipment widely used in industrial fields such as mines and mines. The pump body is large in size and complex in shape. There are multiple cross holes on the working surface. The smallest single pump body weighs nearly 700 kg. The pump body is usually operated in the field, the working environment is harsh, and the conditions are harsh. It has strict requirements on the mechanical properties of the pump body itself: it can withstand a large impact at -40°C (single minimum value 26J), while maintaining Higher strength (for example, tensile strength Rm≥960MPa, yield strength Rp0.2≥850MPa). [0003] In the process of manufacturing the pump body, it is often necessary to carry out quenching and tempering treatment on the pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D1/60
Inventor 陈桂玲李照勇郭为民李辉温建生李一平兰志强赵玉林任丽萍尚志文郑山源曹勇茂赵斌杨健李建功窦继魁谭海兰席艳红王红丽刘铁李建华程丽霞刘文龙代海花
Owner JINXI IND GRP
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