Metal deforming – With temperature modification of tool or of specified... – Cooling
Patent
1985-06-10
1987-06-30
Larson, Lowell A.
Metal deforming
With temperature modification of tool or of specified...
Cooling
29157T, B21D 3716
Patent
active
046760881
ABSTRACT:
This invention relates to an apparatus for manufacturing a T-joint, which consists of a tube portion and a collar portion, by using burring techniques. The apparatus is provided with a high-frequency induction heating unit for heating the circumferential portion of a pilot hole made in a tube, a cooling ring for ejecting a coolant to the circumferential portion of the pilot hole, and a temperature distribution control for controlling the heating rate of the heating unit and the coolant ejection rate of the cooling ring. The apparatus thus constructed enables the working temperature of the parts of the circumferential portion of the pilot hole in the plane of which includes the axes of the tube and the collar to be lower than that of the parts of the circumferential portion in the plane extending at right angle to the above-mentioned plane. Therefore, this apparatus can be used effectively to manufacture a T-joint of which the thicknes of the collar portion is substantially uniform in the circumferential direction of the circumferential portion of the pilot hole.
REFERENCES:
patent: 354879 (1886-12-01), Youngs
patent: 1891338 (1932-12-01), Snell
patent: 2227476 (1941-01-01), Williams et al.
patent: 3368377 (1968-02-01), Hirayama et al.
patent: 3815395 (1974-06-01), Sass
patent: 3910094 (1975-10-01), Luttgert et al.
patent: 4254649 (1981-03-01), Cervenka et al.
patent: 4414833 (1983-11-01), Nicolas et al.
Asao Hiroshi
Okada Ken'ichi
Yonemura Hideo
Hitachi , Ltd.
Larson Lowell A.
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