EP 0172250 B1 19920506 - APPARATUS FOR DIP-HARDENING METAL PIPE
Title (en)
APPARATUS FOR DIP-HARDENING METAL PIPE
Publication
Application
Priority
JP 8400049 W 19840217
Abstract (en)
[origin: WO8503726A1] A hardening apparatus is constructed so that a heated metal pipe is rotatably retained by retaining means so that it is pressed thereby from both above and below. The metal pipe is dipped into cooling water within a water tank by dipping means, and in addition, jets of cooling water are applied to both the inner and outer peripheral surfaces of the metal pipe by cooling water spraying means. After being rapidly cooled in this way, the metal pipe is transported out of the water tank by a transport means. In this apparatus, the metal pipe is not dropped from a height, so it is possible to prevent the surface of the metal pipe becoming flawed, and the rotation of the metal pipe makes it possible to promote what is effectively a stirring of the cooling water. It is also possible to constantly change the portions of the retaining means in contact with the metal pipe, so that the metal pipe can be rapidly and uniformly cooled, and therefore can be well hardened.
IPC 1-7
IPC 8 full level
CPC (source: EP)
C21D 1/64 (2013.01); C21D 9/085 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8503726 A1 19850829; DE 3485709 D1 19920611; EP 0172250 A1 19860226; EP 0172250 A4 19870824; EP 0172250 B1 19920506
DOCDB simple family (application)
JP 8400049 W 19840217; DE 3485709 T 19840217; EP 84900872 A 19840217