Composite molding casting process for water channel and air channel of inner cavity of evaporative pattern

Abstract

The invention belongs to the technical field of evaporative pattern casting, and provides a composite casting process for a water channel and an air channel of an inner cavity of an evaporative pattern. According to the composite casting process for the water channel and the air channel of the inner cavity of the evaporative pattern, the water channel and the air channel of the inner cavity are molded by adopting precoated sand, and other parts of a product form a complete full mold pattern of the product by adopting an evaporative pattern white mold; and then, a compound molding casting process of casting by an evaporative pattern dry sand process is adopted, and the compound casting process comprises the steps of manufacturing of a precoated sand core, manufacturing of a compound product full mold casting pattern and casting of the evaporative pattern. According to the composite casting process for the water channel and the air channel of the inner cavity of the evaporative pattern, manual loose piece taking and subsequent manual bonding in the molding process are reduced; and the automatic production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lost foam casting, and mainly proposes a compound casting process of lost foam inner cavity, water channel and air channel, which is suitable for casting of cylinder block and head products with complex inner cavity and strict requirements on shape and size. Background technique [0002] As the national environmental protection requirements become more and more stringent, the requirements for casting products such as cylinder blocks and heads that affect engine performance are getting higher and higher, and the shape of the inner cavity is becoming more and more complicated; a single lost foam casting process is difficult to meet the performance requirements of the engine and changes; in order to meet the product requirements of these complex castings and improve the overall performance of the engine; a new lost foam composite casting technology must be adopted. [0003] For example, in the paper "Researc...

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Problems solved by technology

[0004] However, in "Research on the Composite Process of Integral Coated Sand Mold and Lost Foam Molding", the mold of coated sand is mainly used. In the early stage, it was not combined with the technology of lost foam molding. It was only to improve the casting process of coated sand. In the late pouring process, the gas in the cavity is not easy to discharge. The negative pressure process used for lost foam casting is adopted, and the lost foam casting sand box is used to evacuate to enhance the exhaust volume; to make the gas generated in the integral coated sand mold Smooth discharge, the casting does not produce porosity defects; reduce the manual process of piercing porosity on the integral coated sand mold; it cannot really be combined with the lost foam casting process

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