JPS61289986A - Production of clad plate - Google Patents

Abstract

PURPOSE:To prevent the bulging on the surface of a material to be adhered and to obtain a clad material having excellent surface quality by using a laser beam for cleaning the surface of a material to be press-welded in the stage of adhering the material to be adhered by cold press welding to the cleaned surface of the material to be press welded. CONSTITUTION:The coil of a 42% Ni-Fe alloy sheet 1 is un-coiled and advances toward a cold press welding roll 2 in the case of, for example, adhering a length of Al sheet 8, by cold press welding, to a stripe shape to the center in the transverse direction of the sheet 1 as a clad material for electronic parts. An irradiation box 3 behind the roll 2 encloses the entire part of the sheet 1 and irradiates the laser beam atop the sheet 1 passing in an Ar gaseous atmosphere maintained in said box. The laser beam from an oscillator 4 irradiates via collimator 5 and a galvanic mirror 6 to the required width part by an ftheta lens 7 to adjust the position. The extreme surface layer of the sheet 1 is thereby melted and solidified by which the deposits, fats and oils and moisture on the surface are removed. On the other hand, the sheet 8 is un-coiled, is fed from above the sheet 1 to the roll 2 and is press welded onto the irradiated surface of the sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application This invention relates to a method for manufacturing a clad plate, in which a clad plate is coated on the entire surface of the substrate or at a desired location with good quality and adhesion.
The present invention relates to a manufacturing method capable of cladding a layered or multilayered tube material.

Background technology As a cladding material for electronic components, 42% NL Fθ alloy plate (substrate) - N plate (adhered material) (hereinafter the same arrangement), 4
6% NLFe alloy plate - A & plate, Kovar alloy plate - A9 brazed plate, 5th plate - AQ plate, stainless steel plate - two-layer clad plate consisting of a substrate material and an adhered material, or furthermore, multiple coatings. A multilayer clad plate made of laminated materials is used.

In the above-mentioned method for manufacturing a crat plate, while unwinding the substrate coil, the surface to be pressure bonded is cleaned by mechanical polishing such as a wire buff, and the material to be bonded is cold pressure bonded to the substrate surface.

However, in mechanical polishing, the surface of the substrate other than the surface scheduled for pressure welding, for example, the entire surface, is polished, and the polishing may cause microcracks, scaly metal powder, adhesion, and residual foreign matter on the polished surface. There is a problem in that during pressure welding of adherends, metal powder, foreign matter, or gas may be entrapped in the pressure contact surface, resulting in swelling of the surface of the adherend. Furthermore, in the case of a so-called striped clad plate in which one or more stripes of adherend material are provided on the substrate surface, microcracks can cause fine metal powder to be generated and adhered during cold welding or subsequent cold opening rolling. ,
This had problems such as deteriorating the quality of the clad plate surface.

Purpose of the Invention The present invention provides a method for manufacturing a clad plate that eliminates the problems caused by cleaning the metal plate surface in the conventional cladding method, prevents blistering on the surface of the adherend, and provides excellent clad plate surface quality. Regarding.

Structure and Effects of the Invention The present invention provides means for cold-pressure welding an adherend material to the surface of an irradiated layer of a pressure-welded material formed by laser beam irradiation.
At least once, on the surface of the metal or alloy substrate,
This is a method for producing a clad plate characterized by cladding seven layers or multiple layers of adhered materials.

More specifically, by moving the metal or alloy substrate and the laser beam of the laser irradiation device relatively, one or more of the required dimensions are applied to the surface to be adhered to the substrate, that is, the entire surface of the substrate surface or a desired position. A method for producing a clad plate, which is characterized by forming an irradiation layer on a local surface by a laser beam, and then cold-pressing a metal or alloy adhering material to the surface of the irradiation layer. After forming an irradiation layer with the laser beam on the surface of the substrate to be adhered by relatively moving the substrate and the laser beam of the laser irradiation device, a metal or alloy adhesion material is cooled onto the surface of the irradiation layer. The above-mentioned method of cold-pressure welding the adherend material to the surface of the irradiated layer formed by the laser beam is repeated, and one or more layers of the adherend material are provided on the surface of the adherend material to form a multilayer. This is a method of manufacturing a clad plate characterized by:

As a result of various studies aimed at cleaning the substrate surface, improving the quality of the surface of the adherend of the clad plate, and increasing the adhesion strength, the inventor of the present invention irradiated the surface of the substrate to be adhered with a laser beam. In addition to removing deposits, oil, and moisture from the surface, the very surface layer of 10 Am or less, preferably on the submicron order, is melted and solidified to form a hardened layer. By creating subdivisions in the hardened layer in response to internal sliding deformation, new internal surfaces can be exposed and the adhesion strength between the substrate and the adherend material can be significantly improved. We have discovered that the generation and adhesion of fine cracks, metal powder, and residual foreign matter can be prevented, and that the bulges on the surface of the cladding material are eliminated without entrainment of gas.

By the manufacturing method of the present invention, it is possible to obtain a highly clean substrate surface, improve the quality of the surface of the adherend of the clad plate, and improve the adhesion strength, reduce the rolling reduction during rolling, and obtain a soft clad plate. There is an advantage that it can be done.

In this invention, the type and combination of the substrate and the adherend material may be any combination that can be cladded, and
Laser beam irradiation may be performed by any method as long as it is capable of removing deposits, oil, fat, and moisture from the surface and melting and solidifying the extreme surface layer of 10 or less. For example, the laser beam may be irradiated in a spot shape to The laser beam is irradiated in a direction orthogonal to the substrate, and the substrate and the laser beam are moved in the same or opposite directions in the longitudinal direction of the substrate. Furthermore, the laser beam is moved in the longitudinal direction of the substrate while being oscillated in the width direction of the substrate. can be adopted.

Further, as the clad plate according to the present invention, in the case of a full clad plate, the plate thickness is preferably 0.05 to 2.0 mm, and in the case of a striped clad plate, the plate thickness is 0.05 mm to 2.0 mm.
The thickness is preferably 1 to 1.0 mm, and the plate thickness may be appropriately selected depending on the intended use.

DISCLOSURE OF THE INVENTION BASED ON THE DRAWINGS FIG. 1 is a perspective explanatory view of a substrate showing the cladding method according to the invention. Here, an example will be described in which one strip of Ag plate is cold-welded in the widthwise center of a 42% NLP8 alloy plate in the form of a stripe.

The 42χNL F8 alloy plate (1) coil is uncoiled and advances to the cold welding roll (2). An irradiation box (3) for irradiating the upper surface of the alloy plate (1) passing through with a laser beam is arranged behind the pressure roll (2), and the irradiation box (3) surrounds the entire alloy plate (1). , Ar gas is vented inside, and the laser beam can be irradiated in an Ar gas atmosphere.

The laser beam is oscillated by a laser oscillator (4), passes through a collimator (5) and a galvanic mirror (6), and is condensed and focused by an fθ lens (7). At this point, the fθ lens (blade position) is adjusted so that the required width of the widthwise central position of the alloy plate (1) can be irradiated.

The alloy plate (1) is irradiated with a laser beam at a required width portion at the center position in the width direction, and the extreme surface layer is melted and solidified, resulting in a new surface from which deposits, oil, fat, and moisture on the surface have been removed.

On the other hand, after being uncoiled, the A& plate (8) is fed from above the alloy plate (1) to the pressure roll (2) and is pressed onto the surface irradiated with the laser beam.

At this time, the molten solidified layer on the irradiated surface is fragmented due to the influence of internal sliding deformation, and the new internal surface is exposed.
) is pressure-welded, the cleanliness is superior compared to conventional mechanically polished surfaces, the adhesion strength between the alloy plate (1) and the A & plate (8) is improved, and the rolling ratio can be reduced compared to the conventional method. , a softer product is obtained.

For example, in the case of lead frame materials, handling and bending are facilitated in the post-cladding process, which is extremely advantageous in improving the lead strength and quality of the material.

In Fig. 1, an example was explained in which a single strip of tube material was cold-welded on an alloy plate, but it can be manufactured in the same way even if it is the entire surface of the alloy plate or multiple strips.Furthermore, By repeatedly applying the same method to the desired location, it is possible to clad the adherend material with another adherend material, resulting in excellent adhesion strength and product properties.

Therefore, the oscillation method of the laser beam, the irradiation output, the distance between the f-theta lens focus and the irradiation surface, the moving speed of the irradiated side, etc. depend on the material and dimensions of the substrate material, the material dimensions of the material to be adhered to, etc. It is necessary to select it appropriately.

The example metal substrate has a plate thickness of 0', 35 mm, and a plate width of 25 mm, 42% NL.
The Fa alloy plate, the adherend material was an Ag plate with a thickness of 0.08 mm and a width of 5.5 mm, atmospheric gas in the irradiation box, Ar gas, and substrate movement speed of 80 m.
/s.

A 500 W output continuous wave laser or a 10 kHz Q-switched laser with an output of 50 W was used as the laser irradiation device, and the method according to the present invention shown in FIG. A laser beam irradiation surface with a width of 5.5 mm is formed continuously in the longitudinal direction of the substrate, and the Ag
The plates were cold-welded using a pressure roll at a rolling rate of 24%.

After that, it was cold rolled once and the plate thickness was 0.25mm.
A striped clad plate according to the present invention having a plate width of 25 mm was obtained. Note that the total rolling reduction was 29%.

For comparison, we also used the same type of metal substrate and adhesion material.
After performing conventional mechanical polishing on the substrate surface using wire puff polishing conditions using a 0.3 mmφ wire rotating brush and a moving speed of 17 m/s, an N plate was cold-welded to form a striped clad plate of the same size. Obtained.

The dimensions, appearance properties, and mechanical properties of the two types of clad plates obtained were investigated, and the results are shown in Table 1.

As is clear from Table 1, it can be seen that according to the method of the present invention, a softer product can be obtained than before, and a clad plate with excellent appearance and excellent quality can be obtained.

Furthermore, we measured the hardness from the surface layer to the inside of the substrate after laser beam irradiation in the present invention before pressure bonding, and the hardness condition from the surface layer to the inside after wire buffing in the comparative example. The results are shown below.

As is clear from Figure 2, the surface layer after wire buffing has a thickness of about 10 μm and is hardened, and since the hardened layer has a lower deformability than the inside, cracks occur due to deformation during pressure welding, and the gaps between The reason why the adherend adheres well to the newly formed surface is understood from the fact that when heat treatment is applied, this area becomes the starting point for diffusion.

The above-mentioned aspect caused by wire buffing is effective as a surface treatment before pressure welding, but on the other hand, if such treatment is performed until deposits, oil, and moisture are reduced and a clean surface necessary for pressure welding is obtained, it will be significantly This results in a rough surface, which causes problems such as the generation and adhesion of scale-like metal powder and the entrainment of gas into the press-contact surface, and it is also difficult to limit polishing to the area on the substrate where the stripes are to be arranged.

On the other hand, the laser beam irradiation according to the present invention can be applied only to the required areas as in the embodiment, and by selecting the irradiation conditions, no rough surface is generated.
Deposits, oil and moisture are removed, and the thickness of the melt-solidified layer can be controlled.

In addition, hardening is observed in this molten solidified layer, and the hardened layer is fragmented due to the influence of internal sliding deformation during pressure welding, and the new surface that appears in the gap has a larger area at a small rolling rate than in the comparative example. It was also confirmed that the diffusion proceeded uniformly when heat treatment was applied, and that the adhesion material was evenly distributed and the adherend material adhered well.

Below margin Table 1

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view of a substrate showing the cladding method according to the present invention. Figure @2 is a graph showing the relationship between substrate depth and Tsukaas hardness. DESCRIPTION OF SYMBOLS 1... Alloy plate, 2... Pressure roll, 3... Irradiation box, 4... Laser transmitter, 5... Collimator, 6... Galvanic mirror, 7... fθ lens,
8...AI board. Ward C1 Aji (AH) i-tan Y-1￥t・, 1 Voluntary procedure Nefushosho August 20, 1985

Claims (1)

[Claims] 1. Cold pressure welding of the adherend material to the surface of the irradiated layer of the wave pressure welding material formed by laser beam irradiation is performed at least once, and one layer or multiple layers of the adherend material are clad on the surface of the metal or alloy substrate. A method for manufacturing a clad plate characterized by the following.