SU1315124A1 - Method of treating alloy in chill casting - Google Patents

Abstract

The invention relates to foundry, production, in particular to the processing of alloys during casting in a chill mold. The invention makes it possible to improve the quality of castings by reducing the segregation, porosity and slagging of alloys with a wide range of crystallization, for example, alloys on copper. basis. .After pouring into the heated chill mold, the melt is heated to a liquid state and thermostatically controlled for slag inclusions. Then, the chill mold with a casting is intensively cooled with a discrete decrease in the heating power of the chill mold and an increase in the coolant flow rate through the cooled chill elements. A fine-grained structure is formed without pores and slag inclusions. 2 hp f-ly. i (L have eaten GO 4 ;.

Description

The invention relates to foundry production, in particular to a method for producing bronze castings in a chill mold,

The purpose of the invention is to improve the quality of castings by reducing the segregation, porosity and slagging of the alloys, mainly copper-based.

The method is carried out as follows.

The steel chill mold is tired on the copper crystallizer, which serves as the chill mold as a base, and in a cold state, they are coated with colloidal graphite with a thickness of 0.2-0.3 mm.

Then the chill mold with the mold is heated at 600-650 ° C for 10-12 minutes. Heating is performed using an electric heater, made in the form of separate spirals with independent control, located around the side surface of the mold. Immediately before pouring, cooling water is supplied to the crystallizer with a temperature of 8-14 ° C. .

The copper alloy is poured through a steel funnel with a pilot. As the chill mold is filled with the melt, the funnel moves upwards so that the feeder does not detach from the surface of the melt. Fill lasts 10-13 seconds;

After pouring, the alloy in the liquid state is thermostatically controlled for 5-7 seconds to ensure the emergence of slag inclusions., Then the heating power decreases in the direction of movement of the crystallization front by subsequent Compiler V. Nikolaev Editor G. Volkova Tehred I.Popovich Korre: ktor A. Obruchar

2238/8

Circulation 740 Subscription VNIITSH State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod; st. Project, 4

by voluntarily disconnecting the coils and simultaneously increasing the flow rate of cooling water through the mold.

The proposed method of processing alloy at. chill casting provides dense fine-grained structure in the absence of post-inclusions, cracks, porosity, segregation, and other defects.

Claims (3)

1. Method of processing the alloy during casting in KOKJmbj, including heating the mold before pouring, pouring the alloy through the sprue gate, moving upwards synchronously with raising the level of the alloy in the shell, then cooling the mold with a casting and embossing J different in that improving the quality of castings, by reducing the segregation, porosity and stuntedness of alloys, predominantly. on a copper base, after filling the chill mold, the alloy poured into it is heated to a liquid state and thermostatically controlled for ascending inclusions, after which the heating power is discretely reduced and at the same time the coolant flow rate increases through the cooled chill elements. 2. A method according to claim 1, characterized in that the alloy in the liquid state is thermostated for 5-7 minutes. 3. A method according to claims 1 and 2, characterized in that the heating power of the engine decreases in the direction of movement of the crystalline front, ation, for example, by successively turning off the heaters.