Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1994-08-05
1995-06-06
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
29890052, B23P 1500
Patent
active
054210860
ABSTRACT:
A heat exchanger has a manifold with a tubular wall. A through aperture is formed in the tubular wall by means of a punch having a cylindrical outer surface terminating in a cutting edge. The punch is moved in a forward stroke in the direction of the generatrices of its cylindrical surface so that the cutting edge comes into contact with the outside of the wall and then passes through its thickness so as to form the aperture.
In order to eliminate a sharp edge causing possible damage to a tube subsequently inserted in the aperture, and to ensure correct centring of such a tube, the cylindrical surface of the punch is joined, at its end opposite to the cutting edge and over at least part of its perimeter, to a surface portion of the punch which is inclined outwardly from the cylindrical surface. At the end of the forward stroke of the punch, the inclined surface portion deforms the tubular wall so as to form a flared portion of the aperture.
REFERENCES:
patent: 2829983 (1956-04-01), DeGain
patent: 2972779 (1961-02-01), Cowley
patent: 3108362 (1963-10-01), Huet
patent: 3158119 (1964-11-01), Thaller et al.
patent: 5088193 (1992-02-01), Okada et al.
patent: 5090477 (1992-02-01), Sprow et al.
patent: 5172762 (1992-12-01), Shinmura et al.
Werkstattstechnik, Zeitschrift fur Industrielle Fertigung, vol. 69, No. 12, Dec. 1979, pp. 777-780.
Cuda Irene
Valeo Thermique Moteur
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