Expendable casting process method for heat-resistant steel perforated grate plate

Abstract

An expendable casting process method for a heat-resistant steel perforated grate plate comprise employing a copolymerization material for foaming for preparing an expendable-casting-process heat-resistant steel perforated grate plate foam model, singly preparing a pouring gate, binding the heat-resistant steel perforated grate plate model with the pouring gate for combination, so as to form a combined model; putting the combined model in a special coating pool for three-time sagging of a coating and three-time baking, and controlling the accumulated thickness of the coating subjected to three-time baking to be 0.8 mm-1.5 mm; again combining the baked combined model in a negative-pressure sandbox by taking 10 models as a pouring body, and forming two pouring bodies; adding sand into the sandbox and compacting through shaking; vacuumizing the sandbox and performing oxygen-enriched combustion on the model to form a hollow shell; and finally performing casting. The casting method is simple in steps, convenient to operate, high in casting efficiency and good in effect, is capable of effectively improving the surface quality of the casting and preventing disadvantages that the casting generates burnt-on sand, sand inclusions, pores and carburets, and helps to reduce labor intensity and save production cost.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for lost foam casting of a heat-resistant steel grate plate with holes. Background technique [0002] The heat-resistant steel grate plate with holes is a kind of porous casting. It is manufactured by ordinary sand casting method. It needs to make small clay cores. There are many processes, the core setting is difficult, and the scrap rate is high. Therefore, it has not been widely used at present. In the general lost foam manufacturing, the strength of the coating is not enough, the casting is seriously increased in carbon, and there are many defects. In order to meet the performance of the casting, the lost foam shell casting method is adopted. [0003] The lost foam shell casting method is: use the copolymer material (STMMA) to foam to make a model consistent with the casting; place the model in the sand box, fill it with dry sand and compact the outer cav...

AI Technical Summary

Problems solved by technology

[0004] However, using this casting method is prone to problems when producing complex small-hole castings: because the pouring process is empty shell pouring, it is difficult to fill and compact the sand inside the model, and the high-temperature strength of the coating is not enough, and casting is easy to occur when producing small-hole parts. Pore ​​sintering is blocked, sand inclusion, sand sticking and other casting defects, so good process measures are required