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Manufacturing method for pump shaft

A pump shaft and alloy steel technology, which is applied in the field of pump shaft preparation, can solve the problems of high requirements and harshness, and achieve the effects of good mechanical properties, prolonging service life and improving strength

Inactive Publication Date: 2016-03-23
NINGBO HONGBO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The working environment of pump valves is diverse and harsh, and the requirements for materials are very high. At present, there are many kinds of alloy steels used for pump valves, mainly based on 40Cr, 20CrMnTi and other basic alloys, but there are still many problems, such as wear resistance and hardness. , rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc., can not meet the production requirements in many occasions, and further improvement is needed to improve production efficiency, reduce costs, improve safety, and extend the service life of the pump shaft. service life

Method used

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  • Manufacturing method for pump shaft
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  • Manufacturing method for pump shaft

Examples

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Effect test

Embodiment 1

[0026] SiC is made into three-dimensional network SiC ceramics (the density of network SiC ceramics is 2.6-2.8g / cm 3 , the porosity reaches 45-55%, the average pore diameter is 2-4mm, and the diameter of the network rib is 1-3mm), and then pre-oxidized at 1120°C for 3 hours, and SiO is generated on the surface of the network ceramics 2 film, and then use the vacuum-air pressure casting method (vacuum degree of 0.05MPa) to make silicon carbide and the alloy steel described in Example 1 in Table 1 to make a three-dimensional network silicon carbide / alloy steel composite material, and finally anneal at 1650 ° C.

[0027] The three-dimensional network silicon carbide / alloy steel composite material after the above annealing treatment is firstly subjected to isothermal normalizing treatment (temperature is 920°C, heat preservation 260min), then mechanically processed into a pump shaft blank, and finally the pump shaft blank is heat-treated to obtain The pump shaft of the present inv...

Embodiment 2

[0029] SiC is made into three-dimensional network SiC ceramics (the density of network SiC ceramics is 2.6-2.8g / cm 3 , the porosity reaches 45-55%, the average pore diameter is 2-4mm, and the diameter of the network rib is 1-3mm), and then pre-oxidized at 1140°C for 2 hours, and SiO is generated on the surface of the network ceramics 2 film, and then use the vacuum-air pressure casting method (vacuum degree of 0.06MPa) to make silicon carbide and the alloy steel described in Example 2 of Table 1 into a three-dimensional network silicon carbide / alloy steel composite material, and finally anneal at 1580 ° C.

[0030]The three-dimensional network silicon carbide / alloy steel composite material after the above annealing treatment is firstly subjected to isothermal normalizing treatment (at a temperature of 935°C and held for 230 minutes), then machined into a pump shaft blank, and finally the pump shaft blank is heat-treated to obtain The pump shaft of the present invention. Among...

Embodiment 3

[0032] SiC is made into three-dimensional network SiC ceramics (the density of network SiC ceramics is 2.6-2.8g / cm 3 , the porosity reaches 45-55%, the average pore diameter is 2-4mm, and the diameter of the network rib is 1-3mm), and then pre-oxidized at 1150°C for 2 hours, and SiO is generated on the surface of the network ceramics 2 film, and then use the vacuum-air pressure casting method (vacuum degree of 0.06MPa) to make silicon carbide and the alloy steel described in Example 3 in Table 1 to make a three-dimensional network silicon carbide / alloy steel composite material, and finally anneal at 1600 ° C.

[0033] The three-dimensional network silicon carbide / alloy steel composite material after the above-mentioned annealing treatment is firstly subjected to isothermal normalizing treatment (at a temperature of 930°C and kept for 240 minutes), then machined into a pump shaft blank, and finally the pump shaft blank is heat-treated to obtain The pump shaft of the present inv...

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Abstract

The invention relates to a manufacturing method for a pump shaft and belongs to the technical field of alloy materials. The manufacturing method includes the following steps that a three-dimensional network silicon carbide / alloy steel composite is firstly subjected to normalizing treatment and then machined into a pump shaft blank, and finally the pump shaft blank is subjected to heat treatment so as to obtain the pump shaft. The volume of silicon carbide in the three-dimensional network silicon carbide / alloy steel composite accounts for 10%-30% of the total volume of the composite. Isothermal normalizing treatment is adopted, the temperature of the isothermal normalizing treatment is 920-940 DEG C, and heat preservation is conducted for 220-260 min. After being subjected to carburizing treatment, the three-dimensional network silicon carbide / alloy steel composite of the pump shaft has a hard abrasion-resisting surface and a tough core part and has high low temperature impact toughness and good machinability; the core part of the pump shaft still keeps toughness and plasticity, and therefore the mechanical properties of the manufactured pump shaft are good; the Rockwell hardness (HRC) of the pump shaft reaches 58-63, the layer depth reaches 0.7-1.0, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to a method for preparing a pump shaft, which belongs to the technical field of alloy materials. Background technique [0002] The working environment of pump valves is diverse and harsh, and the requirements for materials are very high. At present, there are many kinds of alloy steels used for pump valves, mainly based on 40Cr, 20CrMnTi and other basic alloys, but there are still many problems, such as wear resistance and hardness. , rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc., can not meet the production requirements in many occasions, and further improvement is needed to improve production efficiency, reduce costs, improve safety, and extend the service life of the pump shaft. service life. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing a pump shaft. The prepared pump shaft has good mechanical properties...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D9/00C22C38/18C22C38/14C22C38/12
CPCC21D1/28C21D9/00C22C38/005C22C38/12C22C38/14C22C38/18
Inventor 施红飞
Owner NINGBO HONGBO MACHINERY MFG