JPS5944948B2 - brazing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brazing method suitable for brazing a large number of parts at the same time or brazing a complicated shape.

Conventionally, the method of brazing many parts at the same time is
A method is known in which a required number of brazing metal washers or brazing metal foils are placed on a portion to be brazed and passed through a heating furnace.
Furthermore, as a method for brazing a complicated shape, a method has been proposed in which a filter material foil of a shape corresponding to the shape is made, placed on the portion to be laminated, and heated and melted. However, the above two conventional methods each have the following drawbacks. First, in the first method, as the number of locations to be brazed increases, the work of arranging the brazing metal washers requires a great deal of time and effort, leading to an increase in costs. Also,
In the method of making complex-shaped brazing filler metal foil, the mold cost for making the foil is expensive, and it is difficult to control the amount of brazing filler metal. An object of the present invention is to provide a new brazing method that eliminates the drawbacks of the conventional methods described above.

An embodiment of the method of the present invention is characterized in that a brazing material pattern printed on a jig is transferred to a portion to be brazed. According to such a method, even if there are a large number of brazing points or a complex brazing pattern, it can be adequately coped with from the viewpoint of mass production. The method of the invention will now be described in detail with reference to embodiments shown in the accompanying drawings.

First, as shown in FIG. 1a, a brazing material 12 is printed in a predetermined pattern on a suitable jig 10 made of carbon or the like. A screen printing method can be used for this printing. Although the illustrated printing pattern is a pattern consisting of a large number of dots, according to the above printing method, even a considerably complicated shape can be clearly printed. Next, as shown in FIG. 1b, the jig 10 is turned over and placed on the substrate 20 having the portion to be brazed, and heat-treated in a heating furnace.

The roller attachment portion of the substrate 20 is provided with a large number of pin members 22.
The jig 10 is placed on the substrate 20 so that the printed brazing material 12 overlaps the root portion of the corresponding pin member 22 . When the brazing filler metal 12 is heated in a heating furnace, it melts and wetly adheres to the base of the pin member 22, as shown in FIG. 1c, and the brazing filler metal pattern is transferred. Thereafter, when the substrate 20 is taken out of the furnace and cooled, the root portion of each pin member 22 is firmly brazed and fixed to the substrate 20.
As described above, according to the method of the present invention, since the printed brazing material is transferred, even if there are a large number of brazing points and the brazing pattern is quite complex,
Brazing can be achieved inexpensively and efficiently.

Further, when brazing 12' is performed on pin members protruding from the substrate 20 as shown in FIG. After forming the through holes 13 in the substrate 20 and printing the brazing material 12, the jig 10 is fitted onto the substrate 20 and heated, thereby allowing the substrate 20 to be brazed in a predetermined position.

[Brief explanation of the drawing]

1a and 1b are perspective views for explaining a pattern brazing method according to an embodiment of the present invention, FIG. 1c is a perspective view of a board completed thereby, and FIG. A perspective view for explaining the embodiment; FIG. 3 is a perspective view of a substrate completed by the method shown in FIG. 2; 10... Carbon jig, 12... Printed brazing filler metal, 20
... Board, 22... Pin member.

Claims (1)

[Claims] 1. A brazing method characterized by arranging a brazing material on a jig according to a pattern to be brazed, and then placing the jig over a member to be brazed and subjecting it to heat treatment.