Jig unit and method for heat treatment of vessel-like workpiece

Details Jig unit and method for heat treatment of vessel-like workpiece Jig unit and method for heat treatment of vessel-like workpiece

1986-05-27

1988-02-23

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148153, 266274, C21D 118

Patent

active

047268573

ABSTRACT:
Disclosed in a jig unit for heat treatment of a metal workpiece such as, e.g., a hollow hemispherical work as a part of a rocket motor case. The jig unit includes a constraining templet member which is made of a metal having a greater coefficient of expansion than the material of the work and has an outer surface shaped correspondingly to the inner surface of the workpiece. A base of the jig unit holds the templet member and the workpiece such that the outer surface of the templet member is slightly spaced from the inner surface of the workpiece. The work is heated together with the templet member while introducing an inactive gas into the gap between the workpiece and the templet member. By thermal expansion the templet member comes into close contact with the inner surface of the workpiece and serves as a constraining means, whereby strains in the work are remedied. Cooling of the heated workpiece is carried out while the templet member is still in close contact with the inner surface of the workpiece.

REFERENCES:
patent: 2334439 (1943-11-01), Pierce
patent: 3315513 (1967-04-01), Ellenburg
patent: 3977914 (1976-08-01), Wallner et al.
patent: 4602767 (1986-07-01), Spiegelman et al.

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