JPS59169690A - Production of partly clad material - Google Patents

Abstract

PURPOSE:To obtain a titled member which is press welded with a slight clad metal in a spot shape by printing a release agent on the surface of a base metal except the part to be press welded with the clad metal, drying the coated agent, superposing both metallic materials and passing the materials through rolling rolls. CONSTITUTION:A release agent 6 composed of alumina, quartz powder, etc. is printed on one surface of a base metal 1, which is, for example, an Fe-Ni alloy having about 1.5mm. thickness, except the part to be press welded with a clad metal 2, which is pure Al, having about <=20mu thickness, by leaving said part white. The coated release agent is then dried. The metal 2 is superposed on the printed surface of the metal 1 and the superposed metals are passed through rolling rolls 4, 5 to form the press welded part 2' of the metal 2 on the un- printed surface of the metal 1 and the non-press-welded part 2'' of the metal 2 on the printed surface. The part 2'' is naturally cut by shearing force from the boundary line with the part 2'. The partially clad material press welded with the spot-shaped metal is thus continuously obtd. by the simple stage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a partially clad material by rolling compression. This method can be applied, for example, to the production of semiconductor lead frames or various electrical contact members in which a strip-shaped base metal is partially coated with a dissimilar metal.

Semiconductor lead frames generally have a structure in which a band-shaped base metal is partially coated with noble metals (gold, silver, aluminum, etc.) in the form of stripes or spots.

Conventionally, methods for producing a composite material having such a structure include a plating method, a vapor deposition method, and a cladding method using rolling pressure bonding.

Plating and vapor deposition methods enable high-precision strip or spot partial coating of dissimilar metals by employing an appropriate mask method, but manufacturing is extremely complicated due to the management of plating solutions and handling of masks. There are drawbacks to it. In particular, the vapor deposition method requires expensive equipment and has the disadvantage of low productivity.

On the other hand, the cladding method is relatively easy to manufacture, but no method has been developed for continuously rolling and crimping fine cladding metal onto a strip-shaped base metal in the form of spots. For this reason, in the cladding method, it is possible to continuously roll and press thin strips of clad metal onto the base metal in the form of stripes, but there is a drawback that it is not possible to continuously roll and press minute clad metals in the form of spots.

However, some types of metal cannot be plated, and there are limits to the thickness of the plating, so the above-mentioned method of continuous and spot rolling of minute clad metal is an economical and plating method. There is a strong demand for development as an advantageous method to compensate for the shortcomings.

An object of the present invention is to provide a method for manufacturing a partially clad material, which eliminates the drawbacks of the prior art described above and allows a small amount of clad metal to be continuously and efficiently rolled and crimped in spots on a long strip-shaped base metal. There is a particular thing.

That is, the gist of the present invention is to provide a method for manufacturing a partially clad material in which a small amount of clad metal is rolled and crimped in spots on a long strip-shaped base metal. After printing and drying the base metal, a long strip of clad metal is layered on the printed side of the base metal, and then both are passed through a pressure roll, thereby crimping the clad metal in spots only on the non-printed side of the base metal. A method of manufacturing a partially clad material is provided.

In the above, the clad metal is not pressed onto the printed surface of the base metal due to the presence of the release agent even when it is passed through a pressure roll. The non-crimped portion of the clad metal must then be accurately separated from the boundary line with the crimped portion of the clad metal and recovered from the base metal.

In this case, if a clad metal with a thickness of 20μ or less is used in advance, the clad metal on the printed surface of the base metal will not be crimped during rolling crimping with rolls, so the crimped and non-crimped parts of the clad metal will be sheared. A force is applied which causes the sections to naturally sever from the printed boundary line of the base metal, facilitating accurate separation and recovery of the uncrimped portion of the cladding metal.

In addition, when using clad metal with a thickness exceeding 20 μm, in order to obtain the above effect, make cuts in advance at positions corresponding to the crimped and non-crimped portions of the clad metal so that the remaining thickness is 20 μm. It is necessary to provide the following.

Examples of base metal/clad metal combinations include:
For example 5US304/Aa or Ag row, Fe-42
%N1 alloy/Ag or Ag wax, Cu/M, 5US3
04/Cu, Fe-42%Ni alloy/Cu, Cu
/5US304 etc.

Next, an embodiment of the method for manufacturing a partial cladding according to the present invention will be described with reference to the accompanying drawings.

In Figure 1, 1 is Fe with a width of 100# and a thickness of 1.5mm.
- Base metal made of 41% Ni alloy, 2 is width 100
3 is a guide roll, and 4 and 5 are rolling pressure rolls.

First, a release agent 6 made of metal ink is printed and dried (heated to 80° C.) on one side of the base metal 1, leaving white areas where the clad metal 2 is to be rolled and crimped in spots. This printing and drying can be performed during the rolling process, but can also be performed separately from the rolling process.

As the release agent, ceramic powder such as alumina or quartz powder can be used, and in this case, it is liquefied with a binder and then printed and dried.

Next, the clad metal 2 is fed out onto the printing surface side of the base metal 1 and overlapped, and then both are rolled through rolling pressure rolls 4 and 5 at a rolling reduction rate of 50%, respectively.

As a result, a crimped portion 2- of the clad metal 2 is formed on the non-printed surface of the base metal 1, and a non-pressed portion 2' of the clad metal 2 is formed on the printed surface of the base metal. The non-crimped part 2' of the clad metal is not crimped when passing through the rolling and crimping rolls 4 and 5, and due to the shear force that acts between the crimped part and the crimped part, the crimped part 2' is naturally and accurately separated from any boundary line. is cut off. Therefore, after rolling, it is extremely easy to recover the non-crimped portion 2' of the clad metal, and the dimensional accuracy of the crimped portion 2' of the clad metal can be maintained within a desired range.

FIG. 2 shows a partially clad material made in this manner.

On the other hand, FIG. 3 shows another embodiment of the present invention. This embodiment is characterized in that pure M having a thickness of 27 μm is used as the cladding metal 1', and the rest is the same as the above embodiment. That is, the clad metal 1- has cuts of 20 μ in advance at intervals of 1ONn according to the shape of the part to be crimped,
The structure is such that this cut induces natural cutting of the crimped and non-crimped parts of the clad metal when it passes through the rolling pressure rolls.

As an embodiment of this water-saturated invention, as shown in FIG.
1. When arranging multiple rows of 12# and 13 (rolled and crimped in spots), or as shown in FIG. 5, clad metals 15 of different sizes are placed on both sides of the base metal 14.
and 16 may be arranged.

The partially clad material obtained in the above embodiment can be used, for example, as a semiconductor lead frame in place of a spot-plated (vapor-deposited) lead frame.

As described above, the method for manufacturing the partially clad material of the present invention involves first printing and drying a release agent on the entire surface of the base metal excluding the part where the clad metal is to be rolled and crimped, and then overlapping the clad metal on the printed side of the base metal. The clad metal is pressed in spots only on the non-printing surface of the base metal by rolling and pressing the two together, and the following effects are obtained.

(1) Spot-shaped partial cladding materials can be produced continuously and efficiently by simply printing and drying the base metal using a release agent and using a simple rolling process similar to that used for ordinary cladding materials. can.

(21 Since a long strip-shaped clad metal can be used as the material, it is easy to handle.

(3) When the clad metal passes through the rolling and crimping rolls, a non-crimped part is created, which causes a shearing force to act between the crimped part and the non-crimped part of the clad metal. can be easily cut.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a cross-sectional view of a clad metal showing another embodiment of the present invention, and FIGS. 4 and 5 each show another embodiment of the present invention. It is a sectional view of the product shown. 1: base metal, 2: clad metal, 3 guide roll, 4, 5: rolling pressure roll, 6: release agent, 2': crimped part, 2': non-crimped part. 5 Z Illustration 4 Diagram 0 Oki 5 (2) Bud 3 Diagram 1'

Claims (1)

[Claims] 1. In a method for manufacturing a partially clad material in which a small amount of clad metal is rolled and pressed in spots on a long strip-shaped base metal, first, the clad metal is peeled off on the entire surface of the base metal except for the part to be rolled and crimped. print and dry the agent,
A part characterized by overlapping a long belt-shaped clad metal on the printed side of the base metal, and passing both through a rolling pressure roll, thereby crimping the clad metal in spots only on the non-printing side of the base metal. Method for producing clad wood. 2. The method for manufacturing a partial cladding material according to claim 1, wherein the band-shaped cladding metal has a thickness of 20 μm or less. 3. The manufacturing method according to the claims, characterized in that the band-shaped clad metal has a thickness of over 20 μm and has notches corresponding to the shape of the non-printing surface.