JPH05129504A - Manufacture of lead pin - Google Patents

Abstract

PURPOSE:To manufacture, at good yield, a lead pin at which a brazing material is not melted excessively or is melted completely by a method wherein an auxiliary member whose material is the same as that of a jig is fitted into a cutout part at the jig. CONSTITUTION:Lead pins and brazing materials are inserted into stepped and rivet-shaped holes 5 which have been made in a recessed part 4 surrounded by a protrusion-shaped wall 1 at a carbon jig 3 provided with the protrusion- shaped wall 1 and with a cutout part 2 in one part at the upper peripheral edge and which correspond to the shape of the lead pins. Then, an auxiliary number 6, made of carbon, which buries the cutout part 2 is fitted; after that, the brazing materials are melted. Thereby, the protrusion-shaped wall 1 at the upper peripheral edge becomes uniform, and the heat capacity of the jig 3 is well balanced. As a result, a temperature distribution becomes uniform inside the jig 3, and the lead pins at which the brazing materials are not melted excessively or is melted completely and which are uniform can be manufactured at good yield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a lead pin with a brazing filler metal used in an IC or the like, and more particularly to improvement of a jig for melting a brazing filler metal.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a lead pin with a brazing material in which a brazing material is fixed to a head of a lead pin in advance, a large number of stepped rivet-shaped holes corresponding to the shape of the rivet-shaped lead pin are provided. The lead pin and the brazing filler metal were inserted into the jig and suspended so that the brazing filler metal was heated and melted. The jig is provided with a recess in the upper edge of the jig with a convex wall so that the lead pins or the brazing material can be easily fed. After the insertion, and after the insertion, a notch portion was provided in order to push out an excessive lead pin or brazing material from the concave portion. Therefore, there is a problem in that the temperature distribution in the jig is unbalanced and the brazing filler metal is excessively melted or left unmelted, resulting in unsatisfactory quality and yield. In particular, due to market demands for miniaturization, the smaller the shape of the lead pin, the more the problem due to the subtle deviation in temperature distribution has come to the fore.

[0003]

It is an object of the present invention to provide a method of manufacturing a lead pin with a brazing filler metal which has a uniform temperature distribution in a jig and which is free from excessive melting of the brazing filler metal, has no unmelted residue and has a good yield and a good yield. is there.

[0004]

The technical means of the present invention for solving the above problems has a large number of holes corresponding to the shape of the lead pin,
After inserting the lead pin and the brazing material into the hole of the jig having a convex wall and a partial cutout on the upper peripheral edge, insert an auxiliary member of the same material into the cutout, and then melt the brazing material. It is a feature.

[0005]

According to the lead pin manufacturing method of the present invention configured as described above, by fitting the auxiliary member of the same material into the notch, the convex wall at the upper peripheral edge becomes uniform, and the heat capacity of the jig is reduced. Since the balance can be maintained, the temperature distribution in the jig becomes uniform, so that it is possible to manufacture a uniform lead pin without excessive melting or unmelting of the brazing material.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as an embodiment, as shown in FIG. 1, a carbon jig having 110 mm in length, 60 mm in width, 6.5 mm in thickness and a convex wall 1 with a width of 5 mm on the upper peripheral edge and a notch 2 with a length of 25 mm in part. 3 into the stepped rivet-shaped hole 5 (2000 pieces) corresponding to the shape of the lead pin provided in the recess 4 with a depth of 2 mm surrounded by the convex wall,
Material Ni, head diameter 0.25mm, head thickness 0.1mm, foot diameter 0.15m
Insert a lead pin with m, foot length 0.9mm and hang it, then insert AgCu 28%, spherical brazing material with weight 0.04mg, and then make a carbon 5mm length, width to fill the notch.
The auxiliary member 6 having a height of 25 mm and a height of 2 mm was fitted as shown in FIG. 2, and then the brazing material was melted at a temperature of 783 ° C. in a conveyor furnace. On the other hand, the conventional example is the same as the example except that the auxiliary member is not fitted.

[0007] However, when a quality inspection was performed on the wraparound of the brazing material under the neck and the unmelted residue due to excessive melting, the yield was 55% in the conventional example, whereas the yield was 95% in the example, which is a very good result. Got

[0008]

As described above, according to the present invention, by fitting the notch with the auxiliary member made of the same material, the temperature distribution in the jig is uniform and uniform, so that the brazing filler metal melts and melts too much. It has an excellent effect that a brazed lead pin having no residue can be manufactured with high yield.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat treatment jig in one embodiment of the present invention.

FIG. 2 is a perspective view showing a state where an auxiliary member is fitted in a heat treatment jig according to an embodiment of the present invention.

[Explanation of symbols]

 1 Convex wall 2 Notch 3 Jig 4 Recess 5 Hole 6 Auxiliary member

Claims (1)

[Claims] 1. A lead pin and a brazing material are inserted into a hole of a jig having a large number of holes corresponding to the shape of a lead pin, and a convex wall and a partial cutout portion on the upper peripheral edge, and then the cutout portion is formed. A method for manufacturing a lead pin, comprising fitting an auxiliary member made of the same material, and then melting the brazing material.