JPH0573882B2 - - Google Patents
Info
- Publication number
- JPH0573882B2 JPH0573882B2 JP8853088A JP8853088A JPH0573882B2 JP H0573882 B2 JPH0573882 B2 JP H0573882B2 JP 8853088 A JP8853088 A JP 8853088A JP 8853088 A JP8853088 A JP 8853088A JP H0573882 B2 JPH0573882 B2 JP H0573882B2
- Authority
- JP
- Japan
- Prior art keywords
- spiral body
- spiral
- scroll
- cutting
- finishing
- 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.)
- Expired - Lifetime
Links
- 238000005520 cutting process Methods 0.000 claims description 38
- 239000012530 fluid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F01C1/0207—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F01C1/0246—Details concerning the involute wraps or their base, e.g. geometry
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は主として冷凍機などに使用されるスク
ロール形流体機械におけるスクロールの加工方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for processing a scroll in a scroll-type fluid machine mainly used in a refrigerator or the like.
（従来の技術）
一般に、スクロール形流体機械における固定ス
クロール及び公転スクロールは、特開昭62−
253903号公報に見られるように、円板状の鏡板
と、該鏡板の平面に突設する渦巻体とから成り、
これら渦巻体を噛合わせて公転スクロールを固定
スクロールに対し公転駆動し、前記各渦巻体間に
形成される圧縮室で冷媒等の圧縮性流体を圧縮す
るように構成されており、又、前記各スクロール
は、鋳造素体における渦巻体Ａの内側面及び外側
面と、鏡板Ｂにおける前記渦巻体の先端面と対向
する平面とをエンドミル加工で切削している。(Prior art) Generally, fixed scrolls and revolving scrolls in scroll-type fluid machines are
As seen in Publication No. 253903, it consists of a disk-shaped end plate and a spiral body protruding from the plane of the end plate,
These spiral bodies are engaged with each other to drive the revolving scroll to revolve relative to the fixed scroll, and a compressible fluid such as a refrigerant is compressed in a compression chamber formed between each of the spiral bodies. In the scroll, the inner and outer surfaces of the spiral body A in the cast body and the plane facing the end surface of the spiral body in the end plate B are cut by end milling.
この切削加工は、第５図イ及び第６図イの如く
各渦巻体の前削り軌跡に沿つて前削り用エンドミ
ルで前削りを行なつた後に、第５図ロ及び第６図
ロの如く仕上げ軌跡に沿つて仕上げ用エンドミル
で仕上げ削りを行つている。 This cutting process is performed by performing pre-cutting with a pre-cutting end mill along the pre-cutting locus of each spiral body as shown in Figures 5-A and 6-A, and then pre-cutting as shown in Figures 5-B and 6-B. Finishing is performed using a finishing end mill along the finishing trajectory.
（発明が解決しようとする課題）
所が、前記スクロールにおける渦巻体Ａの渦巻
終縁部Ｃより外方に位置される前記鏡板Ｂの平面
ｂを、渦巻体Ａの渦巻終縁から該渦巻体の仮想渦
巻軌跡に沿う半円形位置に亘つてエンドミル加工
で切削する場合、前記エンドミルにおける先端部
周面が余分に摩耗して、渦巻体の仕上げ精度が悪
くなる問題があつた。(Problem to be Solved by the Invention) However, the plane b of the end plate B, which is located outward from the spiral terminal edge C of the spiral body A in the scroll, is connected from the spiral terminal edge of the spiral body A to the spiral body. When cutting with an end mill over a semicircular position along a virtual spiral locus, there is a problem in that the circumferential surface of the tip of the end mill is excessively worn, resulting in poor finishing accuracy of the spiral body.
即ち、前記渦巻体Ａの渦巻終端縁部Ｃより外方
に位置される鏡板Ｂの平面ｂを切削する場合、渦
巻体Ａの内側面及び該内側面と連続する鏡板平面
の切削と連続して、同じエンドミルで前記平面ｂ
を切削するのであるが、前記渦巻体Ａの渦巻終縁
部より外方に位置される鏡板の平面ｂには前記渦
巻体Ａがなくて、前記鏡板平面を浅底に切削する
ことになるため、エンドミルの先端部周面が余分
に摩耗することになるのである。従つて、同じエ
ンドミルで渦巻体を繰返し切削加工すると、この
渦巻体の側面に段差ができて、仕上げ精度が悪く
なるのであり、又、この仕上げ精度を一定に保つ
には、前記エンドミルの交換寿命が短くなる問題
があつた。 That is, when cutting the plane b of the head plate B located outward from the spiral end edge C of the spiral body A, cutting the inner surface of the spiral body A and the plane of the head plate that is continuous with the inner surface is continuously performed. , the plane b with the same end mill
However, since the spiral body A is not present on the plane b of the head plate located outward from the end of the spiral of the spiral body A, the plane of the head plate must be cut shallowly. This results in excessive wear on the peripheral surface of the tip of the end mill. Therefore, if a spiral body is repeatedly cut with the same end mill, a step will be formed on the side of the spiral body, resulting in poor finishing accuracy.In addition, in order to keep this finishing accuracy constant, it is necessary to reduce the replacement life of the end mill. There was a problem with the length becoming shorter.
本発明は以上の如き従来の問題点に鑑み発明し
たもので、目的は、渦巻体の仕上げ精度を高める
ことができると共に、仕上げ用エンドミルの片減
りをなくし、該エンドミルの交換寿命を長くする
ことができるようにするものである。 The present invention was invented in view of the conventional problems as described above, and the purpose is to improve the finishing accuracy of the spiral body, eliminate uneven wear of the finishing end mill, and extend the replacement life of the end mill. It is intended to make it possible to
（課題を解決するための手段）
しかして、本発明は鏡板１に渦巻体２を突設し
たスクロールＳを一対備えたスクロール形流体機
械における前記スクロールＳの加工方法であつ
て、前記渦巻体２の渦巻終縁部より外方に位置さ
れる前記鏡板１の平面を、他方の渦巻体との対向
平面外縁の仕上げ軌跡Ｌよりも外方に位置する前
削り軌跡L′に沿つて前削りを行つた後に、仕上げ
軌跡Ｌに沿つて仕上げ削りを行うことを特徴とす
るものである。(Means for Solving the Problems) Accordingly, the present invention provides a method for processing a scroll S in a scroll type fluid machine including a pair of scrolls S each having a spiral body 2 protruding from an end plate 1. The plane of the end plate 1 located outward from the end edge of the spiral is pre-milled along a pre-milling locus L' located outward from the finishing locus L of the outer edge of the plane facing the other spiral body. After this process, finish cutting is performed along the finishing locus L.
（作 用）
渦巻体２の渦巻終縁部より外方に位置される鏡
板１の平面は、他方の渦巻体と対向する平面外縁
の仕上げ軌跡Ｌよりも外方に位置する前削り軌跡
L′に沿つて前削りが行われるため、前削り用エン
ドミルにおける先端部周面が余分に摩耗して渦巻
体の前削り面は悪くなるが、これは前削り面であ
るから差支えないのであり、又、仕上り削り時に
おけるエンドミルは、その先端縁が鏡板平面と接
触して該平面を削ることになるため、渦巻体２の
仕上げ精度を向上できると共に、仕上げ用エンド
ミルの片減りをなくし、該エンドミルの交換寿命
を長くすることができるのである。(Function) The plane of the head plate 1 located outward from the spiral terminal edge of the spiral body 2 has a pre-cutting locus located outward from the finishing locus L of the outer edge of the plane facing the other spiral body.
Since pre-cutting is performed along L', the peripheral surface of the tip of the pre-cutting end mill will be worn extra, and the pre-cutting surface of the spiral body will be poor, but this is not a problem since it is a pre-cutting surface. In addition, during finishing milling, the end mill comes into contact with the flat surface of the end plate and cuts the flat surface, so it is possible to improve the finishing accuracy of the spiral body 2, eliminate uneven wear of the finishing end mill, and cut the flat surface of the head plate. This makes it possible to extend the replacement life of the end mill.
（実施例）
図において、Ｓは円板状鏡板１の平面にインボ
リユート形状の渦巻体２を突設した固定スクロー
ルS1と公転スクロールS2とから成るスクロールで
あつて、鋳造素体を切削加工して形成するのであ
る。(Example) In the figure, S is a scroll consisting of a fixed scroll S 1 with an involute-shaped spiral body 2 protruding from the plane of a disc-shaped end plate 1 and a revolving scroll S 2 , and the cast body is machined. It is formed by
しかして、前記渦巻体２の先端面２ａは旋盤加
工により切削するのであり、又、渦巻体２の内側
面及び外側面と、鏡板１における他方の渦巻体先
端面と対向する平面１ａとは、エンドミルで切削
加工するのである。 Therefore, the tip surface 2a of the spiral body 2 is cut by lathe processing, and the inner and outer surfaces of the spiral body 2 and the plane 1a of the end plate 1 facing the other spiral body tip surface are as follows. Cutting is done with an end mill.
即ち、渦巻体２における外周側の渦巻終端縁部
２ｂから中心側の渦巻始縁部に向つて渦巻体２外
側面と該外側面と連続する前記鏡板１の平面１ａ
とを、渦巻体２の前削り軌跡に沿つて前削り用エ
ンドミルE1で切削加工した後、渦巻始縁部から
渦巻終縁部に向つて渦巻体２内側面と該内側面と
連続する前記鏡板１の平面１ａとを第１図イ及び
第２図イの如く渦巻体の前削り軌跡に沿つて前記
前削り用エンドミルE1で切削し、次に、前記渦
巻体２における渦巻終縁部から渦巻始縁部に向つ
て渦巻体２外側面と雅外側面と連続する前記鏡板
１の平面１ａとを、渦巻体の仕上げ軌跡Ｌに沿つ
て仕上げ用エンドミルE2で切削した後、渦巻始
縁部から渦巻終縁部に向つて渦巻体２内側面と該
内側面と連続する鏡板１の平面１ａとを渦巻体の
仕上げ軌跡Ｌに沿つて前記仕上げ用エンドミル
E2で切削するのである。又、前記固定スクロー
ルS1における鏡板１で、前記渦巻体２の渦巻終縁
部２ｂより外方位置の平面１ａは、前記渦巻終縁
部２ｂから渦巻体２の仮想渦巻軌跡に沿う半円形
位置に亘つて前記渦巻体内側面の切削と連続して
前記エンドミルで切削加工するのである。 That is, the outer surface of the spiral body 2 and the plane 1a of the end plate 1 that is continuous with the outer surface from the spiral end edge 2b on the outer peripheral side of the spiral body 2 toward the spiral start edge on the center side.
is cut with a pre-cutting end mill E 1 along the pre-cutting locus of the spiral body 2, and then the inner surface of the spiral body 2 and the aforementioned inner surface continuous with the inner surface are cut from the spiral start edge to the spiral end edge. The flat surface 1a of the end plate 1 is cut with the pre-cutting end mill E 1 along the pre-cutting locus of the spiral body as shown in FIG. 1A and FIG. After cutting the outer surface of the spiral body 2 and the plane 1a of the end plate 1 which is continuous with the outer surface from the spiral body toward the spiral starting edge along the finishing locus L of the spiral body, the finishing end mill E 2 is used. The finishing end mill moves the inner surface of the spiral body 2 and the plane 1a of the end plate 1 that is continuous with the inner surface from the edge toward the spiral end edge along the finishing locus L of the spiral body.
It is cut with E2 . Further, in the end plate 1 of the fixed scroll S1, the plane 1a located outward from the spiral end edge 2b of the spiral body 2 is a semicircular position along the virtual spiral locus of the spiral body 2 from the spiral end edge 2b. The end mill performs cutting continuously with the cutting of the inner side surface of the spiral body.
しかして、先ず、固定スクロールS1における渦
巻体２の渦巻終縁部２ｂより外方に位置される前
記鏡板１の平面１ａを、第１図ロ及び第２図ロの
如く公転スクロールS2の渦巻体２との対向平面外
縁の仕上げ軌跡Ｌよりも半径方向外方に位置する
前削り軌跡L′に沿つて前記前削り用エンドミルで
前削りを行うのである。即ち、第１図イ及び第２
図イの如く、前記渦巻体２の内側面及び該内側面
と連続する鏡板平面の前削り用エンドミルE1に
よる前削り加工が終つたとき、この前削り用エン
ドミルE1を、渦巻体２における内側面の仕上げ
軌跡Ｌよりも半径方向外方に変位させて、前記渦
巻体終縁部２ｂより外方に位置される鏡板１の平
面１ａを、前記前削り軌跡L′に沿つて切削し、仕
上げ切削時、仕上げ用エンドミルE2の周面が、
前記鏡板１の対向平面外縁と接触しないようにす
るのである。 First, the plane 1a of the end plate 1 located outward from the spiral terminal edge 2b of the spiral body 2 in the fixed scroll S1 is moved from the flat surface 1a of the end plate 1 to the surface of the revolving scroll S2 as shown in FIGS. 1B and 2B . Pre-cutting is performed with the pre-cutting end mill along a pre-cutting locus L' located radially outward from the finishing locus L of the outer edge of the plane facing the spiral body 2. That is, Figure 1A and Figure 2
As shown in FIG . cutting the flat surface 1a of the end plate 1 located outward from the spiral body terminal edge 2b along the pre-cutting locus L' by displacing the inner surface radially outward from the finishing locus L; During finishing cutting, the circumferential surface of finishing end mill E 2
This is to prevent contact with the outer edge of the opposing plane of the mirror plate 1.
次に、前記渦巻終縁部２ｂより外方に位置され
る鏡板１の平面１ａを、仕上げ軌跡Ｌに沿つ仕上
げ用エンドミルE2で仕上げ削りを行うのである。 Next, the flat surface 1a of the end plate 1 located outward from the spiral terminal edge 2b is finished by a finishing end mill E 2 along the finishing locus L.
従つて、前記前削り用エンドミルE1は、渦巻
体２の内側面を切削した後、先端部周面で前記鏡
板１の対向平面外縁を前削りするため、従来と同
様、その先端部周面が基端側周面よりも余分に摩
耗し、片減りすることになる。この結果、別のス
クロールにおける渦巻体を切削加工するとき、こ
の渦巻体の前削り面は段差ができるが、これは前
削り面であるから差支えないのである。そして、
前記仕上げ用エンドミルE2は、渦巻体２の内側
面と切削した後、先端縁のみが鏡板平面１ａと接
触してその先端が摩耗し、長さが短くなるだけで
あるから、別のスクロールにおける渦巻体を仕上
げ加工する場合、この渦巻体の仕上げ精度を向上
できるのであり、又、仕上げ用エンドミルの交換
寿命も長くできるのである。 Therefore, the pre-cutting end mill E 1 cuts the inner surface of the spiral body 2 and then pre-cuts the outer edge of the opposing plane of the end plate 1 using the circumferential surface of the distal end. is worn more than the proximal peripheral surface, resulting in uneven wear. As a result, when cutting the spiral body of another scroll, a step is formed on the pre-cut surface of this scroll, but this is not a problem because it is a pre-milled surface. and,
After the finishing end mill E 2 cuts the inner surface of the scroll body 2, only the tip edge comes into contact with the end plate plane 1a, and the tip wears out, resulting in a shortened length. When finishing the spiral body, the finishing accuracy of the spiral body can be improved, and the replacement life of the finishing end mill can also be extended.
尚、前記固定スクロールS1における渦巻体２の
渦巻終縁部より外方に位置される前記鏡板１の平
面には、公転スクロールS2における渦巻体２の渦
巻終縁側が位置して、この公転スクロールS2の渦
巻体内周面と、前記固定スクロールS1の渦巻体外
周面との間で圧縮性流体を圧縮することになるた
め、前記平面１ａは、公転スクロールS2の渦巻体
先端面との対向平面のみを高精度に仕上げればよ
いのであり、対向平面外縁は高精度に仕上げなく
とも差支えないのである。 Note that the end edge side of the spiral body 2 in the revolving scroll S 2 is located on the plane of the end plate 1 that is located outward from the end edge of the spiral body 2 in the fixed scroll S 1 , and this revolution Since the compressible fluid is compressed between the inner peripheral surface of the spiral body of the scroll S 2 and the outer peripheral surface of the spiral body of the fixed scroll S 1 , the plane 1a is in contact with the tip surface of the spiral body of the revolving scroll S 2 . It is sufficient to finish only the opposing plane with high precision, and the outer edge of the opposing plane does not need to be finished with high precision.
又、前記スクロールＳにおける渦巻体２の先端
面にはシール溝を設けて、このシール溝にチツプ
シールを保持している。 Further, a seal groove is provided on the tip end surface of the spiral body 2 in the scroll S, and a tip seal is held in this seal groove.
又、前記スクロールＳは、第４図の如く密閉ケ
ーシング３内の上部に内装して、固定スクロール
S1の渦巻体２と公転スクロールS2の渦巻体２とを
噛合わせ、公転スクロールS2を固定スクロールS1
に対し公転可能とするのである。そして、前記ケ
ーシング３内における前記スクロールＳの下方位
置に内装する駆動軸４をもつたモータ５の前記駆
動軸４上端部を、公転機構６を介して前記公転ス
クロールS2に連結して、この公転スクロールS2の
公転駆動により前記渦巻体間に形成される圧縮室
において冷媒を圧縮する如く成すのである。 Furthermore, the scroll S is housed in the upper part of the sealed casing 3 as shown in FIG.
The spiral body 2 of S 1 and the spiral body 2 of the revolving scroll S 2 are meshed, and the revolving scroll S 2 is connected to the fixed scroll S 1
This makes it possible to revolve around. The upper end of the drive shaft 4 of a motor 5 having a drive shaft 4 installed below the scroll S in the casing 3 is connected to the revolution scroll S 2 via a revolution mechanism 6. The refrigerant is compressed in the compression chamber formed between the spiral bodies by the revolution of the revolving scroll S2 .
尚、以上説明した実施例では、固定スクロール
S1における鏡板１の平面を加工したが、公転スク
ロールS2における鏡板１も同様に加工することが
できるのである。 In addition, in the embodiment explained above, the fixed scroll
Although the plane of the end plate 1 in S 1 was processed, the end plate 1 in the revolving scroll S 2 can also be processed in the same way.
（発明の効果）
以上の如く本発明は、鏡板１に渦巻体２を突設
したスクロールＳを一対備えたスクロール形流体
機械における前記渦巻体２の渦巻終縁部より外方
に位置される前記鏡板１の平面を、他方の渦巻体
との対向平面外縁の仕上げ軌跡Ｌよりも外方に位
置する前削り軌跡L′に沿つて前削りを行つた後
に、仕上げ軌跡Ｌに沿つて仕上げ削りを行うので
あるから、前記前削り及び仕上げ削りを、前記渦
巻体２の前削り及び仕上げ用のエンドミルで行う
場合、仕上げ用エンドミルの片減りを防止でき、
前記渦巻体２の仕上げ精度を向上できると共に、
仕上げ用エンドミルの交換寿命を長くでき、それ
だけ加工コストを低減できるのである。(Effects of the Invention) As described above, the present invention provides a scroll type fluid machine equipped with a pair of scrolls S each having a spiral body 2 protruding from an end plate 1. The plane of the end plate 1 is pre-milled along a pre-cutting locus L' located outward from the finishing locus L of the outer edge of the plane facing the other spiral body, and then finish-cutting is carried out along the finishing locus L. Therefore, when the pre-cutting and finish cutting are performed with the end mill for pre-cutting and finishing of the spiral body 2, uneven wear of the finishing end mill can be prevented,
The finishing accuracy of the spiral body 2 can be improved, and
The replacement life of finishing end mills can be extended, and machining costs can be reduced accordingly.
第１図イ〜ハは本発明加工方法の実施例を示す
工程図、第２図イ〜ハは第１図イ，ロ，ハにおけ
る−線断面図、第３図はスクロールのみの横
断面図、第４図はスクロール形流体機械の一部省
略断面図、第５図イ，ロは従来例の工程図、第６
図イ，ロは第５図イ，ロにおける−線断面図
である。
１……鏡板、２……渦巻体、Ｓ……スクロー
ル、Ｌ……仕上げ軌跡、L′……前削り軌跡。
Figures 1A-C are process diagrams showing an embodiment of the processing method of the present invention, Figures 2A-C are cross-sectional views along the - line in Figure 1A, B, and C, and Figure 3 is a cross-sectional view of only the scroll. , Fig. 4 is a partially omitted sectional view of a scroll type fluid machine, Fig. 5 A and B are process diagrams of a conventional example, and Fig. 6 is a partially omitted cross-sectional view of a scroll type fluid machine.
Figures A and B are sectional views taken along the - line in Figures A and B. 1... End plate, 2... Spiral body, S... Scroll, L... Finishing locus, L'... Pre-cutting locus.
Claims (1)
一対備えたスクロール形流体機械における前記ス
クロールＳの加工方法であつて、前記渦巻体２の
渦巻終縁部より外方に位置される前記鏡板１の平
面を、他方の渦巻体との対向平面外縁の仕上げ軌
跡Ｌよりも外方に位置する前削り軌跡L′に沿つて
前削りを行つた後に、仕上げ軌跡Ｌに沿つて仕上
げ削りを行うことを特徴とするスクロール形流体
機械におけるスクロールの加工方法。1. A method for processing the scroll S in a scroll type fluid machine equipped with a pair of scrolls S having a spiral body 2 protruding from the end plate 1, wherein the end plate is located outward from the end of the spiral of the spiral body 2. Pre-milling is performed on the plane of No. 1 along a pre-cutting locus L' located outward from the finishing locus L of the outer edge of the plane facing the other spiral body, and then finish-cutting is performed along the finishing locus L. A method for processing a scroll in a scroll-type fluid machine, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8853088A JPH01262302A (en) | 1988-04-11 | 1988-04-11 | Scroll processing method for scroll-type fluid machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8853088A JPH01262302A (en) | 1988-04-11 | 1988-04-11 | Scroll processing method for scroll-type fluid machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01262302A JPH01262302A (en) | 1989-10-19 |
| JPH0573882B2 true JPH0573882B2 (en) | 1993-10-15 |
Family
ID=13945393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8853088A Granted JPH01262302A (en) | 1988-04-11 | 1988-04-11 | Scroll processing method for scroll-type fluid machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01262302A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3283061B2 (en) * | 1992-06-19 | 2002-05-20 | 株式会社日立製作所 | Machining method of orbiting scroll |
| JP2008240739A (en) * | 1994-07-13 | 2008-10-09 | Hitachi Ltd | Scroll processing method and apparatus |
-
1988
- 1988-04-11 JP JP8853088A patent/JPH01262302A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01262302A (en) | 1989-10-19 |
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