JPS62124072A - Jig for fitting brazing filler material to top part of lead pin - Google Patents

Abstract

PURPOSE:To prevent a defective lead pin from being generated due to the sticking of carbon, and also to realize the long life of a jig by providing a ceramic coating layer on the whole surface containing the inner surface of a holding hole of a carbon base plate provided with a vertical lead pin holding hole. CONSTITUTION:A through vertical lead pin holding hole 2 constituted of the lower hole 2a for receiving the leg part (b) of a lead pin R, and the upper hole 2b for receiving the head part of the lead pin R is provided on a base plate 1 whose materials is carbon. A ceramic coating layer 3 is provided on the whole surface of the base plate 1 containing the inner surface of this hole 2. In this way, it is prevented that carbon powder sticks to the lead pin R and a brazing filler material.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a method for attaching a current-carrying lead pin to a ceramic substrate of an integrated circuit device by heating and melting the solder on the surface. The brazing attachment to the top of the lead pin that holds the lead pin in a vertical position involves a jig.

[Conventional technology]

When attaching silver solder to the top surface of lead pins made of copper alloy, iron-nickel alloy, etc., a jig with many lead pin holding holes in the board is used to increase work efficiency. used. The design of the lead pin holding hole of this jig is appropriately changed according to the shape of the lead bin, but the lead pin is held in such a way that the bin is oriented vertically. For example, as shown in FIG. 5, when mounting a nail-shaped lead bin R with a large-diameter head a by brazing, the base plate 1 has a diameter smaller than the head diameter of the lead bin R and a length longer than the leg length. A lead pin holding hole 2 is provided, such as by combining a pilot hole 2a and an upper hole 2b with a diameter larger than the head diameter and a depth equal to or deeper than the head height,
Suspend the dobbin vertically through this hole. Then, the silver solder chip C is placed on the top of the head of the held dobbin, and the jig is placed in an electric heating furnace and the chip C is fused to the lead pin by heating to a temperature higher than the melting point of the silver solder.

According to this method, the jig is exposed to high temperatures and is therefore required to have heat resistance. Therefore, carbon or ceramics is used as the material for the substrate 1 to meet this requirement.

[Problem that the invention seeks to solve]

However, in the case of carbon jigs, when the lead bin is inserted, carbon powder that originally adheres to the surface or carbon powder that is newly shaved off by contact with the lead pins adheres to the lead pins and silver bottle chips and melts due to heating. It may get stuck in the chip or burnt into the lead bin, making it impossible to remove it. If such a situation occurs, the lead pin will be recognized as a defective product, and each pin after soldering must be inspected under a microscope, which not only becomes a major bottleneck in improving productivity, but also leads to defects. Inspection of non-defective products also raises the possibility of 111 failure.

In addition, since the temperature at which silver brazing is fused is extremely high at 800 to 950°C, the carbon jig is oxidized and consumed, resulting in temperatures ranging from 250°C to 950°C.
There is also the problem that it reaches the end of its life after 300 uses.

On the other hand, ceramic jigs have the advantage of being able to be used semi-permanently as long as they are not damaged by impact due to mishandling. Missing.

The present invention aims to solve all of these problems, that is, to eliminate the occurrence of defective lead pins due to carbon adhesion, and to enable the jig itself to maintain a long life.

[Means for solving problems]

The jig of the present invention includes a carbon substrate provided with vertical lead pin holding holes, and a ceramic coating layer provided on the entire surface including the inner surface of the holding holes.

Jig No. 20 can pre-drill high-precision holes in a carbon substrate with good impact resistance, and by providing a ceramic coating layer on the surface after drilling, it eliminates the generation of carbon powder and oxidation wear due to heating. be able to.

〔Example〕

Embodiments of the invention are shown in FIGS. 1-4.

The jig shown in FIG. 1 has a fifth
A holding hole similar to that shown in the figure, that is, a perpendicular through-hole consisting of a lower hole 2a for receiving the leg of the lead bin R and an upper hole 2b with a larger diameter for receiving the head of the lead bin. A lead pin holding hole 2 is provided, and then a ceramic coating layer 3 is provided on the entire surface of the substrate 1 including the inner surface of the hole 2.

The lead pin holding hole 2 may be a blind hole as shown in Figure 2 O, as long as the length of the pilot hole 2a is equal to the length of the leg of the lead pin.Also, in the case of a blind hole , the entire hole can be made into a step-free hole that is slightly larger than the head diameter of the lead pin (FIG. 3).

In short, any size and shape may be used as long as the lead pin can be held vertically with at least its head recessed into the hole.

Further, as the ceramic forming layer 3, 513N
4. Nitride such as AQ, N, BNXT i N, SiC
.

Carbide such as TiC, or Si02, AQ, 20・-
3S, TlO2, 5iZnO4, MnO2, Cr2O2
Examples include oxides such as

FIG.
An overall view of the 32-digit jig of the invention is shown.

The ceramic coating layer 3 can be formed by degreasing and cleaning the holed board with an organic solvent such as trichlene or triethane, and then removing the seat valve with clean air after drying in order to eliminate dirt caused by carbon powder on the surface of the jig. It is best to form it after going through the purification process mentioned above.

〔effect〕

As mentioned above, since the brazing installation jig of the present invention is provided with a ceramic coating layer on the entire surface of the carbon substrate having lead pin holding holes, it completely eliminates the adhesion of carbon powder to the lead bin and brazing. obtain.

Furthermore, since the main material of the substrate is carbon, it is easy to form holes with high precision and has excellent impact resistance. On the other hand, since the surface is made of ceramic, it has the same oxidation resistance as a jig made of ceramic alone, so there is almost no oxidative wear due to heating, and it can be used semi-permanently.

[Brief explanation of drawings]

1 to 3 are sectional views showing the main parts of the jig of the present invention, FIG. 4 is an overall external view, and FIG. 5 is a sectional view showing the main parts of the conventional jig. 1...Substrate, 2...Lead pin holding hole, 3...Ceramic coating layer

Claims (1)

[Claims] A brazing attachment jig for the top of a lead pin, which is made of a carbon substrate with a vertical lead pin holding hole provided with a ceramic coating layer on the entire surface including the inner surface of the holding hole.