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A production method of a 2507 stainless steel pump casting

A production method and technology for stainless steel pumps, applied in the direction of casting molds, casting mold components, casting molding equipment, etc., can solve the problems of high rejection rate of pump castings and large amount of welding repair, so as to reduce the amount of subsequent repair welding and reduce the repair rate and scrap rate, the effect of reducing production costs

Active Publication Date: 2018-03-02
CHENGDU YONGYI PUMPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above technical problems, the present invention provides a production method for 2507 stainless steel pump castings, thereby solving the problem that the 2507 stainless steel pump castings used to produce pump castings in the past are prone to pores, oxidized slag inclusions and crack castings, resulting in high rejection rates and large welding repairs for pump castings. technical problem

Method used

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  • A production method of a 2507 stainless steel pump casting
  • A production method of a 2507 stainless steel pump casting
  • A production method of a 2507 stainless steel pump casting

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0143] Such as figure 1 Shown, a kind of production method of 2507 stainless steel pump body, this method comprises the following steps:

[0144] (1) Mold design and production

[0145] Make wooden molds and check and accept them;

[0146] (2) Modeling and core making

[0147] 2.1 Sand mixing

[0148] Dry mix the quartz sand and bentonite for 5 minutes until uniform, then add water glass and sodium hydroxide solution and mix for 8 minutes until uniform, and then produce sand;

[0149] 2.2 Modeling

[0150] Wooden molds are used for manual molding to obtain sand molds, and heavy objects are used for manual compaction and uniformity;

[0151] 2.3 Set stomata

[0152] The cover box of the sand mold adopts the vent needle to insert the air outlet connected with the sand mold cavity as the exhaust channel, and the interval between the air outlets is set at 50mm, and the bottom box of the sand mold is 10mm away from the wooden mold, and multiple exhaust channels are also opene...

specific Embodiment 2

[0195] Such as figure 2 Shown, a kind of production method of 2507 stainless steel impeller, auxiliary impeller, this method comprises the following steps:

[0196] (1) Mold design and production

[0197] Make wooden molds and check and accept them;

[0198] (2) Modeling and core making

[0199] 2.1 Sand mixing

[0200] Dry mix the quartz sand and bentonite for 6 minutes until uniform, then add water glass and sodium hydroxide solution and mix for 9 minutes until uniform, and then produce sand;

[0201] 2.2 Modeling

[0202] Wooden molds are used for manual molding to obtain sand molds, and heavy objects are used for manual compaction and uniformity;

[0203] 2.3 Set stomata

[0204] The cover box of the sand mold adopts the vent needle to insert the air outlet connected with the sand mold cavity as the exhaust channel, and the air outlet is set at an interval of 75mm, and the bottom box of the sand mold is 15mm away from the wooden mold, and multiple exhaust channels a...

specific Embodiment 3

[0246] A production method of 2507 stainless steel pump cover, the method comprises the following steps:

[0247] (1) Mold design and production

[0248] Make wooden molds and check and accept them;

[0249] (2) Modeling and core making

[0250] 2.1 Sand mixing

[0251] Dry mix the quartz sand and bentonite for 8 minutes until uniform, then add water glass and sodium hydroxide solution and mix for 10 minutes until uniform, and then produce sand;

[0252] 2.2 Modeling

[0253] Wooden molds are used for manual molding to obtain sand molds, and heavy objects are used for manual compaction and uniformity;

[0254] 2.3 Set stomata

[0255] The cover box of the sand mold adopts the vent needle to insert the air outlet connected with the sand mold cavity as the exhaust channel, and the air outlet is set at an interval of 100mm, and the bottom box of the sand mold is 20mm away from the wooden mold, and multiple exhaust channels are also opened;

[0256] 2.4 stereotypes

[0257]...

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Abstract

The invention relates to a production method of a 2507 stainless steel pump casting. The method includes (1) die designing and manufacturing, (2) moulding and core manufacturing, (3) paint brushing, (4) sand mould and sand core drying, (5) mould assembling, (6) smelting, (7) pouring, (8) mould disassembling and sand removing, (9) gate and riser removing, (10) repair welding, and (11) polishing andshot blasting. Through a reasonable casting process design, casting defects including air holes, oxide slag inclusion and cracks are prevented, the repair rate and the rejection rate of casting are reduced, product quality is ensured, subsequent repair welding is greatly reduced, and the production cost of the casting is reduced.

Description

technical field [0001] The invention relates to a production method of pump castings, and belongs to the technical field of pump casting processing. More specifically, the invention relates to a production method of 2507 stainless steel pump castings. Background technique [0002] 2507 stainless steel is the third generation of super duplex stainless steel, American standard grade, domestic standard code S25073, grade 022Cr25Ni7Mo4N, its metallographic microstructure is a duplex structure with ferrite and austenite accounting for about 50% each, and austenite Compared with austenitic stainless steel, its intergranular corrosion resistance is significantly improved, its strength and corrosion resistance are extremely strong, and its pitting corrosion resistance and crevice corrosion resistance are excellent. [0003] Due to the high content of ferrite in the steel, the brittleness of the steel increases, the fluidity of the molten steel is poor, and the crystal grains are coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C1/02B22C9/02C21C7/00C21C7/06C21C7/076
CPCB22C1/02B22C9/02B22C9/22C21C7/0075C21C7/06C21C7/076Y02P10/143Y02P10/20
Inventor 鲜红军刘从江
Owner CHENGDU YONGYI PUMPS
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