Evaporative pattern casting process of high-chrome wear-resistant castings

Abstract

The invention discloses an evaporative pattern casting process of high-chrome wear-resistant castings. The evaporative pattern casting process is less in air pollution, high in casting quality and lower in cost. The evaporative pattern casting process of the high-chrome wear-resistant castings comprises the following steps that model making is carried out, a foam plastic plate is cut and glued to manufacture a foam plastic model, the foam plastic model is placed into a cavity of a standard mold to be subject to comparison, and the foam plastic model is machined and corrected through an electric heating wire cutting device; the model is combined into a cluster; the model cluster is baked, is placed into a drying chamber to be dried, and is taken out from the drying chamber to be cooled, air exchange in the drying chamber is achieved, and baking is repeatedly executed three times; coating applying is carried out, the surface of the model cluster obtained after baking is coated with a fireproof coating, then the model cluster is placed into a baking room to be dried and is taken out from the baking room to be cooled, air exchange in the baking room is carried, and coating applying is repeatedly carried out three times; box embedding modeling is carried out, a sand box opening is covered with asbestos cloth, the asbestos cloth is covered with a plastic film for sealing, and dry sand in a sand box is vacuumized; casting replacement is carried out; and shakeout piece taking is carried out.

Description

technical field [0001] The invention relates to a casting process, in particular to a lost foam casting process of high chromium wear-resistant castings. Background technique [0002] High chromium cast iron generally refers to white cast iron alloys containing 11-30% Cr and 2.0-3.6% C. It has better wear resistance than steel alloys, better toughness and strength than ordinary white cast iron, and it also has good high temperature resistance and corrosion resistance, coupled with convenient production and moderate cost, it is known as the contemporary One of the finest abrasive wear resistant materials. [0003] The traditional lost foam casting is to bond and combine paraffin or foam models similar in size and shape to the castings to form a model cluster, brush the refractory paint and dry it, bury it in dry quartz sand and vibrate the shape, and pour it under negative pressure to make the model cluster Gasification, liquid metal occupies the position of the model, soli...

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional lost foam casting process, the air pollution is serious, the surface of the casting is rough, and the subsequent grinding workload is heavy and the cost is high