Lost foam casting process for engine cylinder block and head

Abstract

The invention discloses a lost foam casting process for an engine cylinder block and head. The process comprises the following specific steps of making of models: first selecting foaming materials and filling cavities of metal molds with the foaming materials after the foaming materials are pre-foamed and cured, heating the foaming materials to expand the foaming materials again, filling the cavities of the metal molds withfoaming materials, and demolding the foaming materials after the foaming materials are cooled to obtain foam plastic models; model assembling and surface treatment: bonding the foam plastic models to obtain a model cluster and dipping and coating the model cluster with a refractory coating; sand filling and shaping: putting the model cluster obtained in the previous step into a sand box, adding dry quartz sand to the sand box while vibrating the sand box after culturing and fixing sand, and sealing and vacuumizing the sand box; pouring displacement: injecting liquid metal into the model cluster, and displacing the liquid metal and the foam plastic models to finally form a cast; and cooling and cleaning: cooling the sand box and the cast, naturally separating the cast from dry sand so as to obtain a cast finished product. The cast manufactured by the lost foam casting process disclosed by the invention has the advantages of good quality, low cost, unlimited material, various sizes and high precision and can be manufactured on a large scale.

Description

technical field [0001] The invention relates to the application in the technical field of casting technology of automobile parts, in particular to a technology of lost foam casting engine cylinder block and cylinder cover. Background technique [0002] More than 80% of the products in the foundry industry are completed by sand casting, because this process can not only cast blanks with complex shapes and inner cavities, but also has a wide range of applicability, ranging from a few grams to hundreds of tons of castings. [0003] Sand casting is a traditional casting process that uses sand as the main molding material to make molds. Sand molds generally adopt gravity casting, and low-pressure casting, centrifugal casting and other processes can also be used when there are special requirements. Sand casting has a wide range of adaptability, small pieces, large pieces, simple pieces, complex pieces, single pieces, and large batches can be used. Molds for sand casting were mos...

AI Technical Summary

Problems solved by technology

However, sand casting also has some disadvantages: because each sand mold can only be poured once, the mold is damaged after the casting is obtained and must be reshaped, so the production efficiency of sand casting is low; And porous, so the dimensional accuracy of sand casting castings is low, and the surface is rough