White mold production process of evanescent mode

Abstract

The invention belongs to an evanescent mode casting process, in particular to a white mold production process of an evanescent mode. The white mold production process of the evanescent mode comprises the steps of: (1) production of a foam plastic model and a casting head model: a) prefoaming-b) curing-c) molding by foaming; (2) combination of the models to form a cluster; and (3) coating of the models. The white mold production process of the evanescent mode has the following beneficial effects: (1) better foam plastic particles are selected to further reduce remained carbons; and (2) the reasonable prefoaming density of the particles is effectively controlled, so that the deformation or even rupture caused by weak strength of a white mold cannot be generated, and such casting defects as air holes and carbon defects cannot be generated.

Description

technical field [0001] The invention belongs to the lost foam casting process, in particular to a lost foam white mold manufacturing process. Background technique [0002] The lost foam casting process of diesel engine cylinder block first needs to make the lost foam model. The quality of the production directly affects the yield of the casting, among which, some of the most important technical issues are: [0003] 1. Selection of foam plastic beads: Expandable polystyrene resin beads (EPS) are commonly used for casting non-ferrous metals, gray iron and general steel casting, but pyrolysis at a pouring temperature greater than 900°C produces a large amount of Carbon residue remains in the cavity after the pattern disappears; [0004] 2. The number of grams (density) of the white mold, if the number of grams is light, the strength of the white mold is small, and it is easy to deform, if the number of grams is heavy, there will be residue after casting, so the pre-production...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: Based on the above problems, the present invention provides a production process of the lost foam white mold by selecting better foam plastic beads, effectively controlling the pre-expansion density of the foam plastic beads, and preventing the deformation of the white mold.