Production method of evanescent mold

Abstract

The invention discloses a production method of an evanescent mold. The production method comprises the following steps: selecting materials: the particle size of a selected original bead is equal to one eighth of a minimum wall thickness of a casting; pre-foaming: curing, foaming, and sending into a molding machine; producing and stereotyping a mold: introducing steam into the molding machine, secondarily foaming, and molding; assembling the mold: naturally drying the molded mold, transferring into a baking house, bonding the baked mold by virtue of adhesive, and then air drying; paint the mold: preparing the paint; and drying: after the mold is coated with a first coating, sending the mold into the baking house, smearing a second coating, after the second coating is smeared, sending intothe baking house, smearing a third coating, and after the third coating is coated, sending the mold into the baking house. When the evanescent mold prepared in the invention is used for processing thecasting, the casting is good in quality, smooth in surface, fewer in burrs, high in qualification rate, and capable of meeting the requirements of customers.

Description

technical field [0001] The invention relates to a manufacturing method of lost foam, which belongs to the technical field of mold making. Background technique [0002] Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in dry quartz sand, pouring under negative pressure to vaporize the model, liquid metal occupies the position of the model, solidifies and cools to form a new casting method; the general steps are material selection, pre-foaming, mold making and setting, paint baking Dry, vibrated molding, pouring and cooling, and turning over the box; at present, the lost foam process is prone to rough casting surfaces during casting, which cannot meet customer requirements. The reason is largely due to the quality of the lost foam, and t...

AI Technical Summary

Problems solved by technology

[0002] Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in dry quartz sand, pouring under negative pressure to vaporize the model, liquid metal occupies the position of the model, solidifies and cools to form a new casting method; the general steps are material selection, pre-foaming, mold making and setting, paint baking Dry, vibrated molding, pouring and cooling, and turning over the box; at present, the lost foam process is prone to rough casting surfaces during casting, which cannot meet customer requirements. The reason is largely due to the quality of the lost foam, and the quality of the lost foam is good. Bad directly affects the yield of lost foam castings