JPH074797B2 - Method for manufacturing flat tubes for heat exchangers - Google Patents
Method for manufacturing flat tubes for heat exchangersInfo
- Publication number
- JPH074797B2 JPH074797B2 JP1017480A JP1748089A JPH074797B2 JP H074797 B2 JPH074797 B2 JP H074797B2 JP 1017480 A JP1017480 A JP 1017480A JP 1748089 A JP1748089 A JP 1748089A JP H074797 B2 JPH074797 B2 JP H074797B2
- Authority
- JP
- Japan
- Prior art keywords
- flat tube
- tube member
- groove
- cutting
- flat
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
- B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/151—Making tubes with multiple passages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/156—Making tubes with wall irregularities
- B21C37/157—Perforations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
- F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、カークーラー用凝縮器及び蒸発器等の熱交換
器に多用されている偏平管の製造方法に関する。TECHNICAL FIELD The present invention relates to a method for manufacturing a flat tube that is frequently used in heat exchangers such as condensers and evaporators for car coolers.
［従来の技術］ カークーラー用凝縮器は、第１図のように、一般にチュ
ーブと呼ばれることもある偏平管11を蛇行状に屈曲さ
せ、その平行部に放熱用コルゲートフィン12を配すると
ともにこの偏平管11の両端部にユニオン13を設けたもの
が主流となっている。[Prior Art] In a car cooler condenser, as shown in Fig. 1, a flat tube 11 which is generally called a tube is bent in a meandering shape, and a heat dissipation corrugated fin 12 is arranged in a parallel portion thereof. The flat pipe 11 having unions 13 at both ends is the mainstream.
これに対して最近では、第２図のように、所定長さの複
数の偏平管21の間に放熱用コルゲートフィン12を配し、
これらの偏平管21の両端にヘッダーパイプ22を共通に接
続した凝縮器も使われている。On the other hand, recently, as shown in FIG. 2, heat-dissipating corrugated fins 12 are arranged between a plurality of flat tubes 21 having a predetermined length,
A condenser in which header pipes 22 are commonly connected to both ends of these flat tubes 21 is also used.
第１図及び第２図に示す両凝縮器共に、押出し成形によ
り内部に冷媒流路が多数形成された偏平管を用いてい
る。これらの偏平管を得るには、帯状の偏平管部材を所
定長さに切断する切断工程を要する。その切断工程で
は、メタルソーにより切断するのが一般的である。場合
によっては、プレスによるシャー切断も用いらている。Both of the condensers shown in FIGS. 1 and 2 use a flat tube in which a large number of refrigerant passages are formed by extrusion molding. In order to obtain these flat tubes, a cutting step of cutting the strip-shaped flat tube member to a predetermined length is required. In the cutting step, it is common to cut with a metal saw. In some cases, shear cutting with a press is also used.
［発明が解決しようとする課題］ しかしながらメタルソーによる切断では、切断時に多量
のバリ及び切粉が発生するため、得られた偏平管を用い
て凝縮器と成した場合に冷凍回路の目づまり等の不都合
を生ずるおそれがある。通常は、バリ取り及び切粉の洗
浄を行うが、第１図に示す凝縮器に用いる偏平管は長さ
として10m程度あり、また第２図に示す凝縮器の偏平管
は数量が多いため、切断時のバリ，切粉を完全に取り除
く事は難しく、又、多大の工数と経費を要する。[Problems to be Solved by the Invention] However, when cutting with a metal saw, a large amount of burrs and chips are generated during cutting, so when the obtained flat tube is used as a condenser, clogging of the refrigeration circuit, etc. May cause inconvenience. Normally, deburring and cleaning of chips are performed, but the flat tube used for the condenser shown in Fig. 1 has a length of about 10 m, and the flat tube of the condenser shown in Fig. 2 has a large number, so It is difficult to completely remove burrs and chips at the time of cutting, and a great number of man-hours and costs are required.
一方。プレスによるシャー切断は、切粉の発生はない
が、若干のバリが発生する。さらに、切り口のつぶれが
発生する為、偏平管の穴数が少い場合（支柱間距離が長
い場合）は、よりつぶれ量が多くなる。したがってこの
シャー切断を採用することはできない。on the other hand. The shear cutting by the press does not generate chips, but some burr occurs. Further, since the cut ends are crushed, when the number of holes in the flat tube is small (when the distance between the support columns is long), the crushed amount becomes larger. Therefore, this shear cutting cannot be adopted.
またローラに取付けた刃を回転して溝をつけ、その後、
切断溝を開く方向に張力を作用させてカットする方法も
提案されている（例えば、特開昭63−264218号公報参
照）が、溝をつける際に刃が偏平管内にめり込み、プレ
スによるシャー切断の場合と同様にバリが生じ、これに
より通路が半ば閉鎖されるおそれがある。また切断の際
には、偏平管の移送方向にローラにより張力を作用させ
て溝部分で引き裂くので、溝形成部と反対側の偏平管の
端面部分では、伸びながら引きちぎられることになり、
これに伴って、開口端面が平らにならず、端面を整える
工程が必要となり、この場合でもコストが増大する不都
合があった。Rotate the blade attached to the roller to make a groove, then
A method of cutting by applying tension in the direction of opening the cutting groove has also been proposed (see, for example, Japanese Patent Laid-Open No. 63-264218), but the blade cuts into the flat tube when the groove is formed, and shear cutting by pressing is performed. As with the above case, burrs are generated, which may cause the passage to be partially closed. Further, at the time of cutting, since tension is applied by the roller in the transport direction of the flat pipe to tear at the groove portion, the end face portion of the flat pipe on the side opposite to the groove forming portion will be torn while stretching.
Along with this, the opening end face is not flat, and a step of adjusting the end face is required, and even in this case, there is a disadvantage that the cost increases.
それ故に、本発明の技術課題は、バリ，切粉が発生せ
ず、支柱強度が弱い場合でも問題を起こさず、しかも端
面を整える工程を削除でき、製造コストの低減を可能に
した偏平管の製造方法を提供することにある。Therefore, the technical problem of the present invention is that the burr and the cutting chips are not generated, the problem does not occur even when the strut strength is weak, and the step of adjusting the end face can be deleted, and the manufacturing cost can be reduced. It is to provide a manufacturing method.
［課題を解決するための手段］ 本発明によれば、内部に冷媒流路が形成された帯状の偏
平管部材から、所定長の偏平管を得る熱交換器の偏平管
の製造方法において、周縁に切刃が形成され、回転自在
に枢支されたディスクカッタで、前記偏平管部材の上下
壁を横切ることにより、偏平管部材の双方の壁部に溝を
形成し、その後、前記偏平管部材の溝上流側を固定する
一方、この溝を基点として溝下流側を揺動することによ
り、偏平管部材を溝部分で破断させ、偏平管単体を得る
ことを特徴とする熱交換器の偏平管の製造方法が得られ
る。[Means for Solving the Problem] According to the present invention, in the method for manufacturing the flat tube of the heat exchanger, a flat tube having a predetermined length is obtained from a strip-shaped flat tube member in which a refrigerant channel is formed. A disc cutter having a cutting edge formed on the rotatably supported shaft is rotatably supported to cross the upper and lower walls of the flat tube member, thereby forming grooves on both wall portions of the flat tube member, and thereafter, the flat tube member. The flat tube of the heat exchanger characterized in that the flat tube member is broken at the groove portion by fixing the upstream side of the groove and swinging the downstream side of the groove with this groove as a base point to obtain a flat tube unit. Can be obtained.
［作用］ 本発明においては、ディスクカッタが横切ることにより
偏平管部材の上下壁に溝を形成する。その後、偏平管部
材の溝の上流側部分を固定し、溝を基点としてその溝の
下流側部分を揺動させる。この結果、溝に添って偏平管
部材が破断され、所定長の偏平管単体が分離して得られ
る。[Operation] In the present invention, grooves are formed in the upper and lower walls of the flat tube member by traversing the disk cutter. Then, the upstream side portion of the groove of the flat tube member is fixed, and the downstream side portion of the groove is rocked with the groove as a base point. As a result, the flat tube member is broken along the groove, and the flat tube alone having a predetermined length is separated and obtained.
［実施例］ 以下本発明の実施例による熱交換器の偏平管の製造方法
を説明する。[Example] Hereinafter, a method for manufacturing a flat tube of a heat exchanger according to an example of the present invention will be described.
先ず、第３図及び第４図に示すように、従来と同様に押
出し成形された偏平管部材31の切断を所望する箇所（切
断予定箇所）の周囲表面、特に、上下壁に溝又は傷32を
付ける。この傷32の深さは、冷媒通路となる多数の穴33
に達する寸前に止める。First, as shown in FIG. 3 and FIG. 4, the flat tube member 31 extruded and molded in the same manner as in the prior art has grooves or scratches 32 on the peripheral surface of a desired portion (predetermined cutting portion), particularly on the upper and lower walls. Attach. The depth of this scratch 32 is equal to the number of holes 33 that serve as refrigerant passages.
Stop shortly before reaching.
傷32は、第５図に示すように、回転自在に枢支された円
盤状のローラー（ディスクカッタ）34の周面の尖ったエ
ッジ部分則ち切刃を偏平管部材31の両面に押し当て、こ
の状態でローラー34を偏平管部材31上で矢印35とは反対
向きに転動させつつ偏平管部材31の上下壁を横切ること
により付けられる。ローラー34は周面にぎざぎきざを有
したものでもよい。As shown in FIG. 5, the scratch 32 is formed by pressing a sharp edge portion of the disk-shaped roller (disk cutter) 34 rotatably supported (disc cutter), that is, a cutting blade, against both sides of the flat tube member 31. In this state, the roller 34 is rolled on the flat tube member 31 in the direction opposite to the arrow 35, and is attached by crossing the upper and lower walls of the flat tube member 31. The roller 34 may have a knurled peripheral surface.
次に、第６図に示すように、傷32の両側で偏平管部材31
をそれぞれ第１及び第２のクランプ41,42にて挟持し、
例えば、傷32よりも下流側の第１のクランプ41を偏平管
部材31の厚み方向43や幅方向44や長手方向45において振
動させる。こうして偏平管部材31を傷32を中心として揺
動させると、その力は傷32の箇所に集中するため、偏平
管部材31は切断予定箇所で疲労破壊により破断される。
この結果、偏平管単体が得られる。Next, as shown in FIG.
Clamped by the first and second clamps 41 and 42,
For example, the first clamp 41 on the downstream side of the scratch 32 is vibrated in the thickness direction 43, the width direction 44, and the longitudinal direction 45 of the flat tube member 31. When the flat tube member 31 is swung about the flaw 32 in this way, the force concentrates at the location of the flaw 32, so that the flat tube member 31 is broken by fatigue fracture at the planned cutting location.
As a result, a flat tube alone is obtained.
これによると支柱47の強度が弱い場合でも偏平管部材31
を変形させることなく切断して、所望長さの偏平管単体
を得ることができる。さらにこのような疲労破壊による
切断においては、バリや切粉等の異物は発生はしない。
したがってこの偏平管単体を用いて第１図や第２図に示
す凝縮器を製造した場合、冷凍回路の目づまり等の不都
合を生じるおそれはない。しかも開口端面を整える作業
が不要であるため、製造コストの低減も可能である。According to this, even if the strength of the column 47 is weak, the flat tube member 31
Can be cut without deforming to obtain a flat tube unit having a desired length. Furthermore, in cutting by such fatigue fracture, foreign matters such as burrs and chips do not occur.
Therefore, when the condenser shown in FIGS. 1 and 2 is manufactured by using this flat tube alone, there is no possibility of inconvenience such as clogging of the refrigeration circuit. Moreover, since it is not necessary to arrange the opening end face, the manufacturing cost can be reduced.
なお上述した作業が長尺の偏平管部材を連続的に送給し
つつ行なわれることは、従来と同様に当然のことであ
る。It is natural that the above-mentioned work is performed while continuously feeding the long flat tube member, as in the conventional case.
［発明の効果］ 以上説明したように、本発明によれば、偏平管部材の外
壁をディスクカッタが横切って偏平管部材に傷を付ける
ので、その作業に際してはバリや切粉の発生がなく、し
かも支柱の強度が弱い場合でも偏平管部材を変形させる
ことがない。また偏平管部材を傷を基点として揺動さ
せ、その傷に沿って破断させることにより偏平管単位を
分離するので、偏平管単位の開口形状が損なわれること
はない。したがって偏平管単体の開口及び端面が整然と
したもので、複雑な後工程を省くことができ、コストを
低減できる。[Effects of the Invention] As described above, according to the present invention, since the disk cutter traverses the outer wall of the flat tube member and scratches the flat tube member, no burr or chips are generated during the operation, Moreover, the flat tube member is not deformed even when the strength of the support column is weak. Further, since the flat tube unit is separated by swinging the flat tube member around the scratch and breaking the flat tube member along the scratch, the opening shape of the flat tube unit is not damaged. Therefore, since the opening and the end surface of the flat tube are neat, the complicated post process can be omitted and the cost can be reduced.
第１図は本発明によって得られる偏平管を用いて作られ
る凝縮器の一例の斜視図、第２図は同じく他例の斜視
図、第３図は本発明の一実施例において傷を付けられた
偏平管部材の要部の斜視図、第４図は第３図のIV−IV断
面図、第５図は偏平管部材に傷を付ける工程の一例を示
す説明図、第６図は偏平管部材の切断工程を示す説明図
である。 11,21……偏平管単体,31……偏平管部材、12……コルゲ
ートフィン、32……溝又は傷、34……ローラー、41,42
……クランプ。FIG. 1 is a perspective view of an example of a condenser made by using a flat tube obtained by the present invention, FIG. 2 is a perspective view of another example of the same, and FIG. 3 is scratched in an embodiment of the present invention. Fig. 4 is a perspective view of an essential part of the flat tube member, Fig. 4 is a sectional view taken along line IV-IV of Fig. 3, Fig. 5 is an explanatory view showing an example of a step of scratching the flat tube member, and Fig. 6 is a flat tube. It is explanatory drawing which shows the cutting process of a member. 11,21 …… Flat tube alone, 31 …… Flat tube member, 12 …… Corrugated fin, 32 …… Groove or scratch, 34 …… Roller, 41, 42
...... Clamp.
Claims (1)
部材から、所定長の偏平管を得る熱交換器の偏平管の製
造方法において、 周縁に切刃が形成され、回転自在に枢支されたディスク
カッタで、前記偏平管部材の上下壁を横切ることによ
り、偏平管部材の双方の壁部に溝を形成し、 その後、前記偏平管部材の溝上流側を固定する一方、こ
の溝を基点として溝下流側を揺動させることにより、偏
平管部材を溝部分で破断させ、偏平管単体を得ることを
特徴とする熱交換器の偏平管の製造方法。1. A method for manufacturing a flat tube of a heat exchanger, wherein a flat tube member having a predetermined length is obtained from a band-shaped flat tube member having a refrigerant flow path formed therein, wherein a cutting edge is formed on a peripheral edge of the flat tube member, and the flat tube member is rotatable. With the disc cutter pivotally supported, a groove is formed in both wall portions of the flat tube member by traversing the upper and lower walls of the flat tube member, and thereafter, while fixing the groove upstream side of the flat tube member, A method for manufacturing a flat tube of a heat exchanger, characterized in that the flat tube member is broken at the groove portion by swinging the groove downstream side with the groove as a base point, thereby obtaining a flat tube alone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017480A JPH074797B2 (en) | 1989-01-30 | 1989-01-30 | Method for manufacturing flat tubes for heat exchangers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017480A JPH074797B2 (en) | 1989-01-30 | 1989-01-30 | Method for manufacturing flat tubes for heat exchangers |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6167190A Division JP2665315B2 (en) | 1994-07-19 | 1994-07-19 | Method of manufacturing flat multi-hole tube for heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02198798A JPH02198798A (en) | 1990-08-07 |
| JPH074797B2 true JPH074797B2 (en) | 1995-01-25 |
Family
ID=11945168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1017480A Expired - Fee Related JPH074797B2 (en) | 1989-01-30 | 1989-01-30 | Method for manufacturing flat tubes for heat exchangers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074797B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5407116A (en) * | 1989-10-04 | 1995-04-18 | Zexel Corporation | Method and apparatus for cutting flat tubes |
| JPH03124337A (en) * | 1989-10-04 | 1991-05-27 | Zexel Corp | Manufacture of tube for heat exchanger |
| JP3618344B2 (en) * | 1992-12-30 | 2005-02-09 | クラウン・アンリミテッド・マシン・インコーポレーテッド | Pipe disconnecting method and apparatus |
| JPH07164400A (en) * | 1993-12-15 | 1995-06-27 | Nec Corp | Cutting device for glass board |
| US5472126A (en) * | 1993-12-16 | 1995-12-05 | Crown Unlimited Machine, Inc. | Tube slicing technique |
| US6061905A (en) * | 1994-06-20 | 2000-05-16 | Modine Manufacturing Company | Method and apparatus for cutting tubing |
| JP3567499B2 (en) * | 1994-08-31 | 2004-09-22 | 株式会社デンソー | Flat tube cutting method and apparatus |
| IT1283800B1 (en) * | 1995-09-01 | 1998-04-30 | Burr Oak Tool & Gauge | STATIONARY CUTTING DEVICE AND GRADUALLY MOVABLE |
| JP2005177921A (en) * | 2003-12-19 | 2005-07-07 | Zexel Valeo Climate Control Corp | Tube manufacturing method, heat exchanging tube, and heat exchanger |
| KR100820903B1 (en) * | 2006-08-18 | 2008-04-10 | 장영진 | Cooling Medium Tube Cutting Machine Proided with Rolling Roller Edge |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5072278A (en) * | 1973-10-26 | 1975-06-14 | ||
| JPS5183286A (en) * | 1975-01-17 | 1976-07-21 | Asahi Seiki Mfg | ENTOJOKINZOKUKANNOSETSUDANHOHO |
| JPS5918167B2 (en) * | 1975-12-19 | 1984-04-25 | アサヒセイキコウギヨウ カブシキガイシヤ | Kinzoku Pipe Nosetsu Dansouchi |
| JPS54132883A (en) * | 1978-04-05 | 1979-10-16 | Usui Kokusai Sangyo Kk | Cutting method of small diametral metal pipe |
| JPS58188114A (en) * | 1982-04-28 | 1983-11-02 | Toshiba Corp | Preparation of wound-core |
| JPS5918167A (en) * | 1982-07-16 | 1984-01-30 | 松下電器産業株式会社 | Manufacture of sintered body thin sheet |
| JPS623840A (en) * | 1985-06-28 | 1987-01-09 | Showa Alum Corp | Automatic cutting machine for tube to standard size |
-
1989
- 1989-01-30 JP JP1017480A patent/JPH074797B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02198798A (en) | 1990-08-07 |
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| FPAY | Renewal fee payment (event date is renewal date of database) |
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| LAPS | Cancellation because of no payment of annual fees |