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Method for casting box-type complex water-cooling exhaust pipe by using iron mold coated sand

A technology of sand-covered iron casting and exhaust pipes, which is applied to casting molding equipment, molds, cores, etc., to achieve stable and reliable quality, reduced scrap rate, and low manufacturing costs

Active Publication Date: 2013-10-23
GUANGXI YUCHAI MACHINE PARTS MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for casting box-type complex water-cooled exhaust pipes with sand-covered iron molds to solve the microscopic loose defects, improve the surface quality and internal cleanliness of castings, and the overall mechanical properties

Method used

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Embodiment Construction

[0042] The iron mold sand-covered casting process of water-cooled exhaust pipe is different from the previous sand casting process in the molding process and process design. Water-cooled exhaust pipe iron mold sand-covered molding is to choose different types of sand-coated molding machines according to the shape and size of the product. For example, the water-cooled exhaust pipe MKJ and 6CA we produce are three shorter exhaust pipe products. The XTF-Z-1350*740 molding machine is selected, while the T9000 water-cooled exhaust pipe with a length of 1236mm is selected from the XTF-Z-2000*740 molding machine. According to the requirements of iron type specifications, the water-cooled exhaust pipe is generally designed and arranged as 2 pieces / type, divided into upper and lower molds, and the two ends are reversed, and the two products are symmetrical and consistent. A special design is made for the exhaust design of the core head position. For water-cooled exhaust pipes with a l...

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Abstract

A method for casting a box-type complex water-cooling exhaust pipe by using an iron mold coated sand is disclosed. By using the water-free coated sand mold, the method helps to realize rapid cooling and mold filling, eliminate the defects of nail-passing-hole structure loosening and casting deformation often happening in the water-cooling exhaust pipe; and the prepared water-cooling exhaust pipe has higher tensile strength, higher hardness, better graphite morphology and better graphite grade, and the amount of stable pearlites is 98% or more. The yield of castings is improved from 54% to 96% or more. The finished product is good in texture compactness, good in texture refining capability, good in surface quality, and stable and reliable in quality. Also, during the production, the method has the advantages of being small in use level of the sand and paints, small in equipment investment, small in equipment occupied area, high in production efficiency, low in manufacture cost, good in environmental protection property, wide in prospect, and applicable to production of various engine exhaust pipes with high quality demands and complex thin-wall double-layer walls.

Description

technical field [0001] The invention belongs to a casting process for a box-type complex thin-walled water-cooled exhaust pipe of an engine, in particular to a method for casting a box-type complex water-cooled exhaust pipe with iron molds covered with sand. Background technique [0002] Iron mold sand-covered casting water-cooled exhaust pipe is a product with complex internal structure, thin casting wall (5mm) and uniform requirements. [0003] Domestically and even internationally, most of the applied research on iron mold sand-covered casting is used in the production of crankshafts or important castings. However, the use of iron mold casting technology to produce castings with complex structures and thin wall thickness requirements, such as water-cooled exhaust pipe castings, is still blank at present. [0004] Due to the higher and higher requirements for automobile emission and noise, the technical requirements for exhaust pipes of various automobile manufacturers ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/26
Inventor 李文彬
Owner GUANGXI YUCHAI MACHINE PARTS MFG CO LTD
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