Method for production of two-layer pipe casting

Details Method for production of two-layer pipe casting Method for production of two-layer pipe casting

1978-09-01

1980-08-19

Hoag, W. E.

Metal founding

Process

Shaping liquid metal against a forming surface

264 60, 264 80, 264270, 264311, B22D 1308, B29C 504

Patent

active

042179483

ABSTRACT:
A method for the production of two-layer pipe casting is carried out in the following manner. First, a reaction chamber is filled with an initial mixture. Then, the reaction chamber with the initial mixture is set in rotation about its longitudinal axis whereupon the centrifugal acceleration of the reaction chamber is brought up to about 300 to about 1000 g. The initial mixture is then inflamed and centrifugal acceleration is gradually brought down to about 50 to about 100 g for a time period sufficient to enable combustion of the initial mixture as well as subsequent separation of the resultant melt into two layers, external and internal, until their solidification. The separation of the melt composed of the final products of combustion into two layers takes place under the action of centrifugal forces due to the difference in specific weights of said layers. In the course of crystallization of the pipe external and internal layers, as well as during their subsequent cooling, centrifugal acceleration is maintained constant.

REFERENCES:
patent: 3324933 (1967-06-01), Shewmon
patent: 3625276 (1971-12-01), Considine
patent: 3814168 (1974-06-01), Royer
patent: 4005741 (1974-02-01), Juganson

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