Reverse rising type evaporative pattern casting system

Abstract

The invention relates to a reverse rising type evaporative pattern casting system which can achieve multi-point inflow, large-area combustion, rapid casting and rapid solidification in the technical field of casting. The reverse rising type evaporative pattern casting system comprises a sprue, transverse runners and inner runners. The sprue, the transverse runners and the inner runners are made of evaporative pattern materials. The transverse runners include the first-stage transverse runner and the second-stage transverse runner which are sequentially connected with the bottom of the sprue. The first-stage transverse runner and the second-stage transverse runner are in transition connection through a flow blocking section with the narrowed section. The second-stage transverse runner is lower than the first-stage transverse runner. A plurality of bottom layer inner runners and reverse rising runners extending upwards are horizontally arranged on the second-stage transverse runner. The reverse rising runners are led out upwards from the top side of the second-stage transverse runner. The inner runners horizontally extending in the evaporative pattern direction are arranged at the positions, at different heights, on the reverse rising runners. The bottom layer inner runners and the inner runners face the evaporative pattern direction and are connected with an evaporative pattern.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a reverse-rising lost foam pouring system. Background technique [0002] At present, medium and large gray cast iron lost foam castings at home and abroad mostly use EPS (polystyrene) material to make molds. Since the degree of pyrolysis and gasification of EPS is related to temperature, during the pouring process of gray cast iron, the burning of lost foam causes front molten iron The temperature drops significantly, resulting in incomplete combustion at the end of the pattern, and the residual combustion products contain a large amount of carbonized polymers, resulting in slag inclusion defects in castings. [0003] In the process design process, in order to ensure the bottom-up gasification process of the lost foam (to prevent nozzle backspray), the gating system is generally designed as a bottom return or bottom side type. Therefore, in the actual production process, the top...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing lost foam casting technology, the present invention provides a reverse-rising lost foam pouring system that can prevent slag inclusion in lost foam castings, so as to realize the purpose of large-area burning and rapid casting during pouring, and solve the problem of lost foam casting Casting Slag Inclusion Problem Caused by Insufficient Combustion

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