JPH02280981A - Manufacture of spotted partial cladding material - Google Patents
Manufacture of spotted partial cladding materialInfo
- Publication number
- JPH02280981A JPH02280981A JP10231789A JP10231789A JPH02280981A JP H02280981 A JPH02280981 A JP H02280981A JP 10231789 A JP10231789 A JP 10231789A JP 10231789 A JP10231789 A JP 10231789A JP H02280981 A JPH02280981 A JP H02280981A
- Authority
- JP
- Japan
- Prior art keywords
- metal foil
- substrate material
- spot
- base plate
- plate material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005253 cladding Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 239000011888 foil Substances 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims description 32
- 239000004020 conductor Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 25
- 238000005096 rolling process Methods 0.000 abstract description 13
- 238000005520 cutting process Methods 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000011295 pitch Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000007740 vapor deposition Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- Lead Frames For Integrated Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
利用産業分野
この発明は、重ね合わせ圧接、圧延によるスポット状部
分クラッド材の製造方法に係り、定寸送りした金属箔と
基板材を所定間隔で連続的にスポット溶接して仮止めし
た後、回転カッターで所定間隔で金属箔を切断して止着
されない金属箔片を除去し、その後圧接、圧延して高精
度のピッチ、寸法を有するスポット状部分クラッド材を
得る製造方法に関する。[Detailed Description of the Invention] Industrial field of application The present invention relates to a method for manufacturing spot-shaped partial cladding materials by overlapping pressure welding and rolling, in which metal foil fed by a fixed length and a substrate material are continuously spot-welded at predetermined intervals. After temporary fixing, the metal foil is cut at predetermined intervals with a rotary cutter to remove unattached metal foil pieces, and then pressure welded and rolled to produce spot-shaped partial cladding materials with high precision pitch and dimensions. Regarding the method.
背景技術
近年の集積回路を用いる機器には、小型化の要請が強く
、フラットパッケージが多用されるようになった。Background Art In recent years, there has been a strong demand for miniaturization of devices using integrated circuits, and flat packages have come to be frequently used.
かかるフラットパッケージ用の四周方向に端子部が設け
られる第４図に示す如きリードフレーム（３）は、ワイ
ヤボンディングを行う部分に、接合性を良好とする金属
（Ａ１． Ａｇ等）被着部分を設ける必要があり、特に
、リードフレームは量産性とパターンの微細化のため、
プレス加工またはエツチングにより形成されており、第
３図に示す如く、リードフレーム材料（１）上に、前記
被着金属（２）部分を高精度でスポット状に設ける必要
がある。A lead frame (3) for such a flat package as shown in FIG. 4, in which terminal portions are provided in the four circumferential directions, has a metal (A1, Ag, etc.) adhered portion for good bonding in the portion where wire bonding is to be performed. In particular, for lead frames, for mass production and miniaturization of patterns,
It is formed by pressing or etching, and as shown in FIG. 3, it is necessary to provide the deposited metal (2) in a spot shape with high precision on the lead frame material (1).
このような複合材を製造する方法としては、従来、ａ、
蒸着法、ｂ。めっき法、Ｃ９圧延圧接法があるが、より
量産性にすぐれた方法が望まれていた。Conventionally, methods for manufacturing such composite materials include a.
Vapor deposition method, b. There are plating methods and C9 rolling welding methods, but a method with better mass productivity has been desired.
すなわち、ａ、蒸着法は高価な設備を要するだけでなく
、被着不要部分をマスキングする必要があり、蒸着スピ
ードが遅く生産性が低く、また、ｂ、めっき法はめっき
不可能な金属もあり、効率良くめっきできる厚みにも限
界があり、いずれもスポット状部分クラッド材を所定の
ピッチ、寸法を高精度に維持しかつこれを量産的に実現
することができない。In other words, (a) the vapor deposition method not only requires expensive equipment, but also requires masking of unnecessary areas, resulting in slow vapor deposition and low productivity; and (b) the plating method may not be able to plate some metals. There is also a limit to the thickness that can be plated efficiently, and in both cases, it is impossible to maintain a predetermined pitch and dimension of the spot-shaped partial cladding material with high accuracy and to realize this in mass production.
また、Ｃ８圧延圧接法は、リードフレーム帯材上にスト
ライプ状にＡＩやＡｇ箔を設けた後、所定のスポット状
となるよう、不要部分を機械的あるいは化学的に除去す
る（特公昭５９−１０７８号公報）ものであるが、被着
金属の歩留が悪く、被着必要部分をマスキングして不要
部を除去するなど能率が悪く、また、高精度で所定ピッ
チ、寸法にスポット状に設けることは困難であった。In addition, in the C8 rolling pressure welding method, after providing AI or Ag foil in stripes on the lead frame strip material, unnecessary parts are mechanically or chemically removed to form predetermined spot shapes. 1078), but the yield of the deposited metal is poor, the efficiency is poor as it involves masking the parts that need to be deposited and removing unnecessary parts, and it is also difficult to deposit the metal in spots at a predetermined pitch and size with high precision. That was difficult.
また、所定寸法の金属箔片を一定長さの基板材の所定位
置、すなわち所定ピッチで重ね合わせ、圧延、圧接によ
り一定長さのスポット状部分クラッド材を製造すること
は可能であるが、基板材コイルを巻き戻し連続して、被
着予定金属箔を所定寸法、長さで高精度に切断し、さら
に高精度に位置合わせをして連続的に仮止めすることが
できないために、工業的量産が不可能とされていた。Furthermore, it is possible to manufacture a spot-shaped partial cladding material of a certain length by overlapping metal foil pieces of a certain length on a certain length of a substrate material at a certain position, that is, at a certain pitch, rolling, and pressure welding. Because it is not possible to continuously unwind the plate coil, cut the metal foil to be adhered to a predetermined size and length with high precision, align it with high precision, and temporarily fasten it continuously, it is difficult to do so industrially. Mass production was considered impossible.
すなわち、リードフレーム材上にＡＩ箔をスポット溶接
にて止着した後、これをクラッド化したリードフレーム
が提案（特公昭６０−２２７４５６号公報）されている
が、金属箔を所定ピッチで高精度に位置合わせし、連続
的に仮止めするための具体的な製造方法が提案されてお
らず、実用化困難である。In other words, a lead frame has been proposed (Japanese Patent Publication No. 60-227456) in which AI foil is spot-welded onto the lead frame material and then made into a cladding. No specific manufacturing method has been proposed for positioning and continuous temporary fixing, and it is difficult to put it into practical use.
さらに、単にスポット溶接したのみでは、圧延性に問題
を生じて、高精度で所定ピッチ、寸法を維持できない問
題があった。Furthermore, simply spot welding causes problems in rollability, making it impossible to maintain predetermined pitches and dimensions with high precision.
発明の目的
この発明は、かかる現状に鑑み、被着予定金属箔を所定
寸法、長さで高精度に切断し、これを例えば、リードフ
レーム材に高精度に位置合わせをして連続的に仮止めし
、クラッド化できるスポット状部分クラッド材の製造方
法の提供を目的としている。Purpose of the Invention In view of the current situation, the present invention is to cut a metal foil to be adhered to a predetermined size and length with high precision, align it with a lead frame material with high precision, and continuously temporarily cut the metal foil to a predetermined length. The object of the present invention is to provide a method for producing spot-shaped partial cladding material that can be fixed and cladded.
発明の概要
この発明は、
基板材上に所定間隔で所定寸法の金属箔片を圧着したス
ポット状部分クラッド材の製造方法において、
基板材と金属箔を重ね合わせ、金属箔片表側の通電材と
基板材裏側の電極とにより、金属箔を基板材の長手方向
に一定間隔でスポット溶接し、さらに、回転カッターに
より長手方向に一定間隔で幅方向に金属箔を切断した後
、溶接止着されていない金属箔片を除去することにより
、基板材上に所定間隔で所定寸法の金属箔片を配列し、
その後仮止めした金属箔片と基板材を圧接、圧延するこ
とを特徴とするスポット状部分クラッド材の製造方法で
ある。Summary of the Invention The present invention provides a method for manufacturing a spot-shaped partial cladding material in which metal foil pieces of a predetermined size are crimped onto a substrate material at predetermined intervals. The metal foil is spot welded at regular intervals in the longitudinal direction of the substrate material using the electrode on the back side of the substrate material, and then the metal foil is cut in the width direction at regular intervals in the longitudinal direction using a rotary cutter, and then the metal foil is welded and fixed. By removing the missing metal foil pieces, metal foil pieces of a predetermined size are arranged at a predetermined interval on the substrate material,
This is a method for producing a spot-shaped partial cladding material, which is characterized in that the temporarily fixed metal foil piece and the substrate material are then pressure-bonded and rolled.
さらに詳述すれば、この発明は、 ■金属箔と基板材を定寸送りして重ね合わせる。More specifically, this invention: ■Feed the metal foil and substrate material by a fixed length and overlap them.
■金属箔表側の通電材と基板材裏側の電極とにより両者
を挾み、シリーズスポット溶接を行う。■Series spot welding is performed by sandwiching the conductive material on the front side of the metal foil and the electrode on the back side of the substrate material.
かかる定寸送り、シリーズスポット溶接により、所定幅
の金属箔を所定位置に重ね合わせて、基板材の長手方向
に一定間隔で仮止めする。By such fixed size feeding and series spot welding, metal foils of a predetermined width are overlapped at predetermined positions and temporarily fixed at regular intervals in the longitudinal direction of the substrate material.
■例えば、一定間隔で保持した一対の回転カッターによ
り、金属箔を一定間隔で幅方向に切断する。(2) For example, a pair of rotating cutters held at regular intervals cut the metal foil in the width direction at regular intervals.
■切断後、溶接止着していない部分を除去する。■After cutting, remove the part that is not welded.
■この繰返しにより、基板材に連続して、所定寸法の金
属箔片を所定ピッチに重ね合わせることができる。(2) By repeating this process, metal foil pieces of a predetermined size can be stacked continuously on the substrate material at a predetermined pitch.
さらに、圧接、圧延して、量産性に優れたスポット状部
分クラッド材を得る工程からなる。Furthermore, the process includes pressing and rolling to obtain a spot-shaped partial cladding material that is excellent in mass productivity.
図面に基づ〈発明の開示
第１図ａ、ｂ、ｄ、＠はこの発明による製造工程を示す
概略説明図であり、ｅ、８図はライン方向から見た溶接
装置と切断機の概略説明図である。Based on the Drawings <Disclosure of the Invention Figures 1 a, b, d, and @ are schematic explanatory diagrams showing the manufacturing process according to the present invention, and Figures e and 8 are schematic explanatory diagrams of the welding device and cutting machine seen from the line direction. It is a diagram.
１広
コイルから巻き戻した基板材（１０）は、シリーズスポ
ット溶接装置（１３）へ図示しない定寸送り装置にて所
定長さずつ送り出され、上方より金属箔（１１）が同様
に定寸送り装置にて所定長さずつ送り出される。The substrate material (10) unwound from the 1-wide coil is fed to the series spot welding device (13) in predetermined lengths by a feeder (not shown), and the metal foil (11) is similarly fed from above. The device sends out a predetermined length at a time.
さらに、シリーズスポット溶接装置（工３）の下流側に
は、一対の円形カッター（１６）による切断装置が設け
てあり、後述する溶接後にコイルに巻き取るか、あるい
はさらに、下流側に設けた圧延装置にて圧接、圧延する
。Further, downstream of the series spot welding device (Step 3), a cutting device using a pair of circular cutters (16) is provided, and the cutting device is used to wind the coil into a coil after welding, which will be described later, or to roll it into a coil provided downstream. Pressure weld and roll using equipment.
基板材（１０）と金属箔（２０）の定寸送り装置は、図
示しないが、所定長さずつ送り出すことができれば、公
知のいずれの構成も利用できる。Although the device for feeding the substrate material (10) and the metal foil (20) to fixed lengths is not shown, any known configuration can be used as long as it can feed the substrate material (10) and the metal foil (20) in predetermined lengths.
シリーズスポット溶接装置は、ｂ図に示す如く、基板材
（１０）の金属箔（１１）圧着予定位置の裏面側、ここ
では下面の中央部に上下動可能に電極（１４）を配置し
、また金属箔（１１）側に通電材（１５）を配設しであ
る。As shown in Figure b, the series spot welding device has an electrode (14) arranged movably up and down on the back side of the substrate material (10) at the planned crimping position of the metal foil (11), here in the center of the bottom surface. A current-carrying material (15) is provided on the metal foil (11) side.
すなわち、基板材（１０）に沿って所定位置にガイドす
る機構を設けた送りこみ装置により、前記電極（１４）
と通電材（１５）が開閉可能となり、基板材（１０）と
金属箔（１１）が定寸送りされて所定位置に重ね合わせ
られたのち、前記電極（１４）と通電材（１５）が移動
して基板材（１０）と金属箔（１１）に当接した際通電
し、スポット溶接する構成からなる。That is, the electrode (14) is moved by a feeding device equipped with a mechanism for guiding the electrode (14) along the substrate material (10) to a predetermined position.
The current-carrying material (15) can be opened and closed, and the substrate material (10) and metal foil (11) are fed by a fixed length and overlapped at a predetermined position, and then the electrode (14) and the current-carrying material (15) are moved. When the substrate material (10) and metal foil (11) come into contact with each other, electricity is applied and spot welding is performed.
切断装置は、Ｃ図に示す如く、所定間隔で保持され図示
しない駆動モーターで回転する円形カッター（１６）か
らなり、移動してきた金属箔（１１）をその幅方向に切
断する構成からなる。As shown in Figure C, the cutting device consists of circular cutters (16) held at predetermined intervals and rotated by a drive motor (not shown), and is configured to cut the moving metal foil (11) in its width direction.
作風
■金属箔（１１）がガイドする機構により、基板材（１
０）の所定位置に送り込まれ、前記装置により電極が開
閉可能なシリーズスポット溶接装置（１３）に基板材（
１０）と金属箔（１１）が送り込まれる。Style ■ The mechanism guided by the metal foil (11) allows the substrate material (1
The substrate material (
10) and metal foil (11) are fed.
この際、所定送り量は圧接、圧延、仕上げ圧延によって
変形する量を見込んでおく必要がある（ａ図参照）。At this time, the predetermined feed amount needs to take into account the amount of deformation due to pressure welding, rolling, and finish rolling (see figure a).
■電極（１４）を上昇させて溶接用通電材（１５）が金
属箔（１１）を基板材（１０）に押付けた時点で該電極
（１４）に加圧通電することにより金属箔を溶接する（
ｂ、ｃ図参照ン。■When the electrode (14) is raised and the welding current-carrying material (15) presses the metal foil (11) against the substrate material (10), the metal foil is welded by applying pressure and current to the electrode (14). (
See figures b and c.
このとき、金属溶融部の大きさは金属箔表面に出ない程
度に溶接するのが望ましく、溶接箇所は基板材（１０）
幅方向に一点以上に並べるとよい。At this time, it is desirable to weld the size of the metal molten part to such an extent that it does not come out on the surface of the metal foil, and the welding area should be placed on the substrate material (10).
It is best to line them up at one or more points in the width direction.
特に、第１図Ｃ図に示す如く、溶接は基板材（１０）幅
方向の金属箔片（１１）両端部の２点を溶接するとよく
、後工程の圧延時にロールに噛みこむ先端側のみを仮止
めして後端側をフリーにすることにより、圧接、圧延性
が向上する。In particular, as shown in Figure 1C, it is best to weld two points at both ends of the metal foil piece (11) in the width direction of the substrate material (10), and only the tip side that will be caught in the roll during rolling in the subsequent process. By temporarily fixing and leaving the rear end free, pressure welding and rolling properties are improved.
■上記溶接装置より所定ピッチの整数倍に位置した基板
材（１０）部分に固定された金属箔（１１）を所定間隔
に配置した円形カッター（１６）により所定長さに切断
して金属箔（１１）の整形を行う（ｄ、ｅ図参照）。■The metal foil (11) fixed to the substrate material (10) part located at an integral multiple of the predetermined pitch is cut into a predetermined length by the circular cutter (16) arranged at a predetermined interval by the above-mentioned welding device. 11) Perform the shaping (see figures d and e).
この際、所定長さは圧接圧延、仕上げ圧延によって変形
する量を見込んでおく必要がある。At this time, it is necessary to take into account the amount by which the predetermined length will be deformed by pressure rolling and finish rolling.
■切断後、溶接されていない部分を除去することにより
、スポット溶接により仮止めされかつ形状が良好な所定
寸法の金属箔片（１２）を得ることができる（＠参照）
。■After cutting, by removing the unwelded parts, it is possible to obtain a metal foil piece (12) of a specified size that is temporarily fixed by spot welding and has a good shape (see @)
.
例えば、前記■工程を同時に行った後、■■■工程を同
時に行うサイクルを繰返す。For example, a cycle is repeated in which the steps 1 and 2 are performed simultaneously, and then the steps 2 and 2 are performed simultaneously.
■次に、金属箔片（１２）を所定ピッチで連続的に仮止
めした基板材（ｌＯ）を圧接、圧延して、スポット状部
分クラッド材を得る。(2) Next, a substrate material (lO) on which metal foil pieces (12) are continuously temporarily fixed at a predetermined pitch is pressed and rolled to obtain a spot-shaped partial cladding material.
発明の効果
この発明により、蒸着法やめっき法に比べ量産性にすぐ
れた圧延により、スポット状部分クラッド材を製造する
ことが可能となった。Effects of the Invention The present invention has made it possible to manufacture spot-shaped partial cladding materials by rolling, which is superior in mass productivity compared to vapor deposition and plating methods.
この発明の製造方法によるスポット状部分クラッド材は
、所定位置に高精度で所定寸法に所定のろう材などの金
属部分が形成されているため、リードフレームの形成時
の形状精度並びに量産性にすぐれている。The spot-shaped partial cladding material produced by the manufacturing method of the present invention has a metal part such as a brazing filler metal formed in a predetermined position with high precision and a predetermined size, so it has excellent shape accuracy and mass productivity when forming a lead frame. ing.
また、この発明では、金属箔の切断に回転切断を採用し
ているため、例えば、従来のクリアランスを２〜３□に
保持する打抜き方式が約２０００回程度で目詰まりを起
こすのに対して、はとんどメンテナンスフリーとなる利
点がある。In addition, since this invention uses rotary cutting to cut the metal foil, for example, the conventional punching method that maintains a clearance of 2 to 3 squares causes clogging after about 2000 punches. has the advantage of being almost maintenance-free.
第１図ａ、ｂ、ｄ、＠はこの発明による製造工程を示す
概略説明図であり、ｅ、ｅ図はライン方向から見た溶接
装置と切断機の概略説明図である。
第２図はスポット状部分クラッド材の斜視説明図である
。
第３図はリードフレームの一例を示す説明図である。
１０・・・基板材、１１・・・金属箔、１２・・・金属
箔片、１３・・・シリーズスポット溶接装置、１４・・
・電極、１５・・・溶接用通電材、１６・・・円形カッ
ターFigures 1a, b, d, and @ are schematic explanatory diagrams showing the manufacturing process according to the present invention, and Figures e and e are schematic explanatory diagrams of a welding device and a cutting machine as seen from the line direction. FIG. 2 is a perspective explanatory view of a spot-shaped partial cladding material. FIG. 3 is an explanatory diagram showing an example of a lead frame. DESCRIPTION OF SYMBOLS 10... Substrate material, 11... Metal foil, 12... Metal foil piece, 13... Series spot welding device, 14...
・Electrode, 15... Current-carrying material for welding, 16... Circular cutter
Claims (1)
ポット状部分クラッド材の製造方法において、 基板材と金属箔を重ね合わせ、金属箔片表側の通電材と
基板材裏側の電極とにより、金属箔を基板材の長手方向
に一定間隔でスポット溶接し、さらに、回転カッターに
より長手方向に一定間隔で幅方向に金属箔を切断した後
、溶接止着されていない金属箔片を除去することにより
、基板材上に所定間隔で所定寸法の金属箔片を配列し、
その後仮止めした金属箔片と基板材を圧接、圧延するこ
とを特徴とするスポット状部分クラッド材の製造方法。[Claims] 1. A method for manufacturing a spot-shaped partial cladding material in which metal foil pieces of a predetermined size are crimped onto a substrate material at predetermined intervals, the substrate material and the metal foil being superimposed, and the conductive material on the front side of the metal foil pieces being The metal foil is spot welded at regular intervals in the longitudinal direction of the substrate material using the electrode on the back side of the substrate material, and then the metal foil is cut in the width direction at regular intervals in the longitudinal direction using a rotary cutter, and then the metal foil is welded and fixed. By removing the missing metal foil pieces, metal foil pieces of a predetermined size are arranged at a predetermined interval on the substrate material,
A method for producing a spot-shaped partial cladding material, which is characterized in that the temporarily fixed metal foil piece and the substrate material are then pressure-welded and rolled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10231789A JPH02280981A (en) | 1989-04-21 | 1989-04-21 | Manufacture of spotted partial cladding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10231789A JPH02280981A (en) | 1989-04-21 | 1989-04-21 | Manufacture of spotted partial cladding material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02280981A true JPH02280981A (en) | 1990-11-16 |
Family
ID=14324202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10231789A Pending JPH02280981A (en) | 1989-04-21 | 1989-04-21 | Manufacture of spotted partial cladding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02280981A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0493595A1 (en) * | 1989-09-20 | 1992-07-08 | Sumitomo Special Metals Company Limited | Method of producing spot-like partially clad member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60227456A (en) * | 1984-04-26 | 1985-11-12 | Nec Corp | Lead frame for semiconductor device |
| JPS62224484A (en) * | 1986-03-26 | 1987-10-02 | Showa Alum Corp | Method for providing clad layer of dissimilar metal part at fixed intervals on strip like metal sheet |
-
1989
- 1989-04-21 JP JP10231789A patent/JPH02280981A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60227456A (en) * | 1984-04-26 | 1985-11-12 | Nec Corp | Lead frame for semiconductor device |
| JPS62224484A (en) * | 1986-03-26 | 1987-10-02 | Showa Alum Corp | Method for providing clad layer of dissimilar metal part at fixed intervals on strip like metal sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0493595A1 (en) * | 1989-09-20 | 1992-07-08 | Sumitomo Special Metals Company Limited | Method of producing spot-like partially clad member |
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