Rotating-erosion-preventing pouring system for vacuum lost foam casting

Abstract

A rotating-erosion-preventing pouring system for vacuum lost foam casting consists of a pouring cup, a sprue, an erosion-preventing material and an erosion-preventing coating, wherein one half of the pouring cup is funnel-shaped, and the other half is rectangular; the pouring cup and the sprue are manufactured by the aid of special foam molds; the foam pouring system adopts a hollow structure, and two ends are sealed by the aid of films by the special foam mold for the sprue through bonding; the sprue is coated with the special erosion-preventing coating with the certain thickness and can be used after dried at a certain temperature for 15-24 h. With the adoption of the rotating-erosion-preventing pouring system for vacuum lost foam casting, the product percent of pass of vacuum lost foam cast castings is increased to be higher than 95%, the price is low, and the system has more obvious advantages for large castings (for example, pipe fittings higher than DN1600) in particular and is ideal in comprehensive usage performance and cost performance state.

Description

technical field [0001] The invention relates to the technical field of vacuum lost foam casting, in particular to a vacuum lost foam casting anti-rotation scour gating system Background technique [0002] As one of the foundations of the vacuum lost foam casting process, full mold casting is also called gasification mold casting or foam polystyrene mold casting, referred to as F-method (Full Mold Process). It was invented and patented by H.F.shroyer on April 15, 1958, and the patent was developed into industrial application in 1962. Ten years later, in 1969, the vacuum-sealed molding method was born. Vacuum sealing molding is also called decompression molding or negative pressure molding, referred to as V-method (Vaccum Sealed Molding Process), which is another process basis of vacuum lost foam casting. Their appearance and development have laid the technological foundation for the emergence of vacuum lost foam casting. [0003] Since the earliest appearance of vacuum los...

AI Technical Summary

Problems solved by technology

[0005] 1) The sprue cup in the general pouring system, the molten iron is easy to rotate out during the pouring process, affecting the pouring speed, causing pauses and slow pouring speeds, resulting in defects such as cold shut, insufficient pouring and wrinkled skin; 2) The pouring system has a high density, Causes pouring reverse spraying, slow pouring speed, cold shut and other defects; 3) Poor strength of the pouring cup, resulting in sand washing, castings cannot be poured successfully, and the rejection rate is high; 4) The cost is high

Images