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Electrostatic powder spraying method for valve casting

An electrostatic powder and casting technology, which is applied to the surface coating liquid device, pretreatment surface, coating, etc., can solve the problems that cannot meet the high quality requirements of the appearance surface of environmentally friendly castings, and achieve strong adhesion and improved smoothness , Anti-wear ability and water erosion resistance improvement effect

Inactive Publication Date: 2016-04-06
QINGDAO HEDELONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to its inherent characteristics, elastic gate valve castings are more and more favored by many users at home and abroad, and are widely used in electric power, petroleum, metallurgy and other industries. With the advancement of science and technology, people's awareness of environmental protection is gradually increasing. More and more attention is paid to the appearance of daily products, and higher requirements are placed on valve products with rough surfaces. The existing surface painting process of valve castings can no longer meet people's requirements for environmental protection and high-quality casting appearance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] The electrostatic powder spraying method for valve castings in this embodiment includes the following steps: 1. Surface treatment: (1) screw the valve castings on the bolts, and then use steel shots with a specification of Φ0.8mm to perform shot blasting on the surface of the valve castings , remove burrs, sand inclusions, rust, oil, and inspect the surface of valve castings after shot peening to ensure that the appearance is complete and free of defects; (2) refine the non-processed surface to remove traces and rust left by grinding , to achieve a smooth surface;

[0012] 2. Electrostatic spraying: (1) Heat the valve castings to be sprayed to 240°C, and then keep them warm for 60 minutes; (2) Drain the air compressor before using it, and then put on the valve castings after the heat preservation treatment according to the first Spraying is carried out in the order of the inner cavity first and then the outer surface. During the spraying process, the spray gun is 20cm a...

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Abstract

The invention discloses an electrostatic powder spraying method for valve casting. Valve casting is processed by surface treatment, electrostatic spraying and workpiece curing, the surface, subjected to spraying treatment, of the valve casting is greatly improved in degree of finish, so that sealing reliability of a sealing surface, matched with an encapsulated gate plate, of a valve body is improved, and friction force, in a starting process, of the gate valve is further reduced, and therefore, operation torque is reduced; compared with a conventional spray coating, the valve casting is environmentally-friendly, is great in thickness of a spraying layer, is strong in adhesive force, is not liable to drop, and is relatively improved in abrasion resistance and water erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of plastic spraying process on the outer surface of castings, and in particular relates to an electrostatic powder spraying method on the outer surface of valve castings. Background technique [0002] Due to its inherent characteristics, elastic gate valve castings are more and more favored by many users at home and abroad, and are widely used in electric power, petroleum, metallurgy and other industries. With the advancement of science and technology, people's awareness of environmental protection is gradually increasing. More and more attention is paid to the appearance of daily products, and higher requirements are placed on valve products with rough surfaces. The existing surface painting process of valve castings can no longer meet people's requirements for environmental protection and high-quality casting appearance. Contents of the invention [0003] In order to overcome the above technical prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/12B05D3/02B05D3/12B05D3/06B05D3/04
CPCB05D1/12B05D3/0218B05D3/048B05D3/067B05D3/12B05D2202/00
Inventor 常云青李云坤翟召武代云冈刘成林常安
Owner QINGDAO HEDELONG MACHINERY
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