US 2003/0111459 A1Published application

Convection type brazing apparatus for metal workpieces

AssigneeOak Nippon Co., Ltd.

InventorMakoto Nishimura

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Abstract

The invention provides a convection type brazing apparatus for metal workpieces such as aluminum, copper, iron and so forth that enables uniform heating of the metal workpieces to prevent deformation of the workpieces and can shorten a heating time to achieve a higher operation efficiency. A heating medium gas heated by a tube heater 36 in a thermal medium gas heating chamber 45 is forwarded by a fan 37 to manifolds 41A and 41B located on both left and right sides, to be blown through a multitude of nozzles 43 toward workpieces W to which a brazing material and flux have been applied in advance. Once the workpieces temperature has reached a predetermined temperature for brazing, a switching valve located in an upper duct 48 is activated so that the heating medium gas is intermittently blown to the workpieces. As a result, a temperature slope of the workpieces is minimized and uniform brazing can be performed.

Claims14

Dependent claims

A convection type brazing apparatus for metal workpieces having a brazing furnace provided with at least a thermal medium gas heating chamber, a brazing chamber and a heating medium gas circulation path through which said heating medium gas heated in said thermal medium gas heating chamber returns to said thermal medium gas heating chamber via said brazing chamber, comprising:

a heating medium gas circulation path switching mechanism for periodically switching said heating medium gas circulation path so that a blowing phase during which said heating medium gas heated in said thermal medium gas heating chamber is blown into said brazing chamber and a suspension phase during which blow of said heating medium gas into said brazing chamber is suspended are alternately repeated;
and
a bypass circulation path through which said heating medium gas returns directly to said thermal medium gas heating chamber halfway of said heating medium gas circulation path without running through said brazing chamber during said suspension phase.

Dependencies are inferred from the claim text.