JPH0312967B2 - - Google Patents
Info
- Publication number
- JPH0312967B2 JPH0312967B2 JP27559484A JP27559484A JPH0312967B2 JP H0312967 B2 JPH0312967 B2 JP H0312967B2 JP 27559484 A JP27559484 A JP 27559484A JP 27559484 A JP27559484 A JP 27559484A JP H0312967 B2 JPH0312967 B2 JP H0312967B2
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- grooved
- plug
- tube
- diameter
- 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
Links
- 239000002184 metal Substances 0.000 claims description 52
- 229910052751 metal Inorganic materials 0.000 claims description 52
- 238000003754 machining Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000011295 pitch Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Description
【発明の詳細な説明】
本発明は金属管、特に外径16mm前後、肉厚1.5
mm前後以下の引張強さが比較的小さい小径薄肉な
金属管、例えば外径10mm前後、肉厚0.4mm前後の
銅管の内面に連続して溝付加工を施すのに適した
装置に関するものである。[Detailed Description of the Invention] The present invention relates to a metal tube, particularly an outer diameter of about 16 mm and a wall thickness of 1.5 mm.
This relates to equipment suitable for continuously grooving the inner surface of small-diameter, thin-walled metal tubes with a relatively low tensile strength of around 10 mm or less, such as copper tubes with an outer diameter of around 10 mm and a wall thickness of around 0.4 mm. be.
第１図は、発明者等が前に提案した内面溝付金
属管の加工方式（特願昭52−103905号（特公昭61
−57806））を示すものである。 Figure 1 shows the method of processing metal tubes with internal grooves previously proposed by the inventors (Japanese Patent Application No. 103905/1983).
−57806)).
第１図において、被加工材である金属管１の内
部には、片端側にフローテイングプラグ４が固定
され、他端側には内面溝付加工用の溝付プラグ５
が回転自在に取付けられたタイロツド３が配置さ
れている。フローテイングプラグ４は進行側が小
径で反対側が大径でその間が斜面２１に形成され
ており、金属管１の管壁を挟んだ外周の対向部に
はフローテイングプラグ４の小径部及び斜面２１
に対応する形状を備えた引抜ダイス７がホルダー
６に保持されている。 In FIG. 1, a floating plug 4 is fixed to one end of a metal tube 1, which is a workpiece, and a grooved plug 5 for internal groove processing is fixed to the other end.
A tie rod 3 is disposed in which a tie rod 3 is rotatably attached. The floating plug 4 has a small diameter on the advancing side and a large diameter on the opposite side, and a slope 21 is formed between them, and the small diameter part of the floating plug 4 and the slope 21 are formed on opposite sides of the outer periphery of the metal tube 1 across the pipe wall.
A drawing die 7 having a shape corresponding to the drawing die 7 is held in the holder 6.
フローテイングプラグ４は、金属管１が矢印２
の方向へ引張駆動されるとき、引抜ダイス７と協
働して金属管１を縮管するので、溝付プラグ５を
金属管１の進行側へ移動させることなく所定位置
に保持される。 In the floating plug 4, the metal tube 1 is indicated by the arrow 2.
When the metal tube 1 is pulled and driven in the direction shown in FIG.
溝付プラグ５が位置する部位の外周には、同じ
外径をもつた複数のロール８が同一円周上に配置
されている。これらのロール８は、軸受９により
回転自在に支持されプーリ１０によつて回転駆動
される回転ヘツド１７内に、その軸心から一定距
離を保持するように取付けられ、回転ヘツド１７
の内周転動面１６と金属管１の外面に転動接触す
るようになつている。従つて、管１を移動させつ
つ回転ヘツド１７を回転駆動させることにより、
溝付プラグ５の部位を通過する金属管１は、そこ
で遊星状に回転する各ロール８により内側に位置
する溝付プラグ５上へ押圧され、内面に溝１４の
加工が行われる。内面に溝加工が施された金属管
１はその後ホルダー１２に支持された仕上ダイス
１３を通すことにより所定の外径に仕上げられ
る。 A plurality of rolls 8 having the same outer diameter are arranged on the same circumference around the outer periphery of the portion where the grooved plug 5 is located. These rolls 8 are mounted within a rotating head 17 that is rotatably supported by a bearing 9 and rotationally driven by a pulley 10 so as to be kept at a constant distance from the axis of the rotating head 17.
The inner peripheral rolling surface 16 of the metal tube 1 comes into rolling contact with the outer surface of the metal tube 1. Therefore, by rotating the rotary head 17 while moving the tube 1,
The metal tube 1 passing through the grooved plug 5 is pressed there by planetary rotating rolls 8 onto the grooved plug 5 located inside, and grooves 14 are formed on the inner surface. The metal tube 1 whose inner surface is grooved is then passed through a finishing die 13 supported by a holder 12 to be finished to a predetermined outer diameter.
この加工装置における各ロール８は、その軸心
が溝付プラグ５の軸心と平行に配置され、自身の
軸心の周囲を自転しつつ金属管１の外周を公転す
る。従つて、金属管１が矢印２方向へ移動すると
き金属管１と各ロール８との間にはすべりが生
じ、その摩擦力によつて金属管１に生ずる応力が
増大することになる。実験の結果によれば、この
ような摩擦による応力は、引抜速度の平方根にほ
ぼ比例し、金属管１の引張強さとの関係から最大
加工速度が制限されることになる。 Each roll 8 in this processing device has its axial center parallel to the axial center of the grooved plug 5, and revolves around the outer periphery of the metal tube 1 while rotating around its own axis. Therefore, when the metal tube 1 moves in the direction of the arrow 2, a slip occurs between the metal tube 1 and each roll 8, and the stress generated in the metal tube 1 increases due to the frictional force. According to the results of experiments, stress due to such friction is approximately proportional to the square root of the drawing speed, and the maximum processing speed is limited due to its relationship with the tensile strength of the metal tube 1.
最大加工速度が制限されることは、径済性の点
からより高速加工が必要とされることが多い、例
えば外径10mm前後、肉厚0.4mm前後の銅管のよう
に引張強さが比較的小さい小径薄肉な金属管の加
工には不利である。 The maximum machining speed is limited because higher speed machining is often required from the viewpoint of diameter saving. For example, when making copper tubes with an outer diameter of around 10 mm and a wall thickness of around 0.4 mm, the tensile strength is comparable. This method is disadvantageous for processing small-diameter, thin-walled metal tubes.
本発明の目的は、引張強さが比較的小さい小径
薄肉な金属管であつても加工速度を向上させるこ
とのできる内面溝付金属管の加工装置を提供する
ことにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for processing a metal tube with internal grooves, which can improve the processing speed even for a small-diameter, thin-walled metal tube with a relatively low tensile strength.
本発明によれば、斯かる目的は、前記したよう
な加工装置におけるロールの代りに複数個の球を
用いることにより達成することができる。 According to the invention, this object can be achieved by using a plurality of balls instead of rolls in the processing equipment as described above.
以下、本発明の加工装置の一実施例を第２図〜
第４図を参照して説明する。第１図と同部品は同
符号で示し、同部分の説明は省略する。 An embodiment of the processing apparatus of the present invention is shown in Figs.
This will be explained with reference to FIG. The same parts as in FIG. 1 are indicated by the same reference numerals, and explanations of the same parts will be omitted.
第２図において、１５が例えば鋼からなる回転
加工部材としての球であり、この球１５は第３図
に示すように、回転ヘツド１７の内周転動面１６
をもつ凹部に同じ大きさのものが６個、互いに接
触した状態で回転自在に配置されている。この場
合、球１５の接点間の距離が球１５の直径より小
さくなつているため、各球１５は内周転動面１６
をもつ凹部に収容することにより、内側に管１や
溝付プラグ５がないときでも脱落するようなこと
はない。配置の態様によつてはストツパ等の保持
手段を設けることが望ましい。 In FIG. 2, reference numeral 15 denotes a ball as a rotary processing member made of steel, for example, and as shown in FIG.
Six pieces of the same size are rotatably placed in contact with each other in a recessed part. In this case, since the distance between the contact points of the balls 15 is smaller than the diameter of the balls 15, each ball 15 is connected to the inner rolling surface 16.
By accommodating the plug in a recess having a diameter, it will not fall off even when there is no pipe 1 or grooved plug 5 inside. Depending on the arrangement, it may be desirable to provide holding means such as a stopper.
第２図に示すような各部材の配置関係におい
て、金属管１を矢印２の方向へ移動させながら回
転ヘツド１７を矢印１１の方向へ回転させると、
各球１５は第３図に示すように、回転ヘツド１７
の回転に伴つて内周転動面１６及び金属管１の外
周面に沿つて矢印１９の方向へ自転しつつ矢印２
０の方向へ公転し、第１図の場合と同様に、金属
管１を縮管すると共に溝付プラグ５上へ押圧す
る。その結果、金属管１の内面には溝付プラグ５
の外形が転写され、溝１４が連続的に形成され
る。 In the arrangement of each member as shown in FIG. 2, when the rotary head 17 is rotated in the direction of arrow 11 while moving the metal tube 1 in the direction of arrow 2,
Each ball 15 is connected to a rotating head 17 as shown in FIG.
As the arrow 2 rotates along the inner rolling surface 16 and the outer peripheral surface of the metal tube 1 in the direction of the arrow 19,
0, and as in the case of FIG. 1, the metal tube 1 is contracted and pressed onto the grooved plug 5. As a result, a grooved plug 5 is formed on the inner surface of the metal tube 1.
The outer shape of the groove 14 is transferred and the groove 14 is continuously formed.
この場合、各球１５の自転方向１９は、夫々の
隣接部において逆方向となるが、回転ヘツド１７
の回転方向１１及び回転速度と、金属管１の回転
ヘツド１７に対する相対的移動方向及び移動速度
等によつておのずから定まる方向となり、球１５
と金属管１の間では殆どすべりがなく、転動のみ
の関係となる。従つて、溝加工に伴つて金属管１
に生ずる応力は、各球１５と管１との間のすべり
に基づく摩擦抵抗分が軽減され、引張強さが比較
的小さい小径薄肉の金属管であつても加工速度を
増大させることができる。 In this case, the rotation direction 19 of each ball 15 is opposite in its adjacent portion, but
The direction is automatically determined by the rotational direction 11 and rotational speed of the metal tube 1 and the relative movement direction and movement speed of the metal tube 1 with respect to the rotating head 17.
There is almost no slippage between the metal tube 1 and the metal tube 1, and the relationship is only rolling. Therefore, along with groove machining, the metal pipe 1
As for the stress generated, the frictional resistance due to the sliding between each ball 15 and the tube 1 is reduced, and the processing speed can be increased even for a small diameter thin metal tube with a relatively low tensile strength.
発明者の実験によれば、回転ヘツド１７の回転
数を5800rpmとしたときの加工速度は、ロールを
用いた場合、10〜12m／分であつたものが、ボー
ルを用いた場合、16m／分であつた。 According to the inventor's experiments, when the rotation speed of the rotary head 17 was set to 5800 rpm, the processing speed was 10 to 12 m/min when using rolls, but was 16 m/min when using balls. It was hot.
なお、加工時には金属管１の塑性変形や各部の
摩擦によつて発熱があるので、潤滑と冷却を兼ね
た適当な手段、例えばエマルジヨンタイプの潤滑
液を加工部分に注ぐなどの手段を講じる必要があ
る。 Note that during machining, heat is generated due to plastic deformation of the metal tube 1 and friction between various parts, so it is necessary to take appropriate means for both lubrication and cooling, such as pouring an emulsion type lubricant onto the machining part. There is.
第３図に示すように、各球１５を互に接触させ
て配置した場合、球１５間に摩擦があるが、これ
は球１５の径及び内周転動面１６の径を適宜選定
して各球１５の間にギヤツプを設けることにより
回避できる。その場合、球１５と回転ヘツド１７
との間に位置変化が生じないように適当なストツ
パを設けておくことが望ましい。そうすることに
より内側に管１や溝付プラグ５がないときでも球
１５が脱落、飛散するのを防止することができ
る。 As shown in FIG. 3, when the balls 15 are placed in contact with each other, there is friction between the balls 15, but this can be achieved by appropriately selecting the diameter of the balls 15 and the diameter of the inner rolling surface 16. This can be avoided by providing a gap between each ball 15. In that case, the ball 15 and the rotating head 17
It is desirable to provide a suitable stopper to prevent positional changes between the two. By doing so, it is possible to prevent the ball 15 from falling off and scattering even when there is no tube 1 or grooved plug 5 inside.
第４図は複数個の球１５によつて金属管１の内
面に溝１４を形成した場合の一本の溝１４に沿つ
た管壁部の断面を誇張して示している。 FIG. 4 shows an exaggerated cross section of the tube wall along one groove 14 when the groove 14 is formed on the inner surface of the metal tube 1 by a plurality of balls 15.
移動する金属管１の外面を複数の球１５が転動
して金属管１を溝付プラグ５上へ押圧すると、管
１の内面には溝付プラグ５の外形が転写されて溝
１４が形成されるが、管１の外面には第４図に示
すように、ねじ状に高さｈの凹凸が生ずる。この
凹凸は球１５の外径ｄ、球１５が転動する時のピ
ツチＰ、球１５の内接円径、金属管１の移動速度
等によつて変化するが、管１の表面性状を悪くす
ることは否めない。 When a plurality of balls 15 roll on the outer surface of the moving metal tube 1 and press the metal tube 1 onto the grooved plug 5, the outer shape of the grooved plug 5 is transferred to the inner surface of the tube 1, forming a groove 14. However, as shown in FIG. 4, a thread-like unevenness with a height h is formed on the outer surface of the tube 1. This unevenness changes depending on the outer diameter d of the ball 15, the pitch P when the ball 15 rolls, the diameter of the inscribed circle of the ball 15, the moving speed of the metal tube 1, etc., but it may deteriorate the surface quality of the tube 1. It is undeniable that I will.
因みに、内周転動面１６部の内径を30mmとし、
そこに直径10mmの球１５を６個収容した回転ヘツ
ド１７を5800rpmで回転させ、外形12mmの銅管１
を16m／分の速度で移動させて加工したとき、高
さ約0.01mmの凹凸が約0.6mmのピツチでらせん状
に発生した。 By the way, the inner diameter of the inner rolling surface 16 is 30 mm,
The rotary head 17 containing six balls 15 with a diameter of 10 mm was rotated at 5800 rpm, and the copper tube 1 with an outer diameter of 12 mm was rotated.
When the machine was moved at a speed of 16 m/min, unevenness with a height of about 0.01 mm was generated in a spiral shape with a pitch of about 0.6 mm.
内面に溝加工が施された金属管１はその後仕上
ダイス１３に通されるので、外面の凹凸が消失し
て外面の平滑度が増し、外径も所定の寸法に仕上
げられる。この場合、外面の凸部に対応した溝１
４の底部が多少内側に***することになるので、
溝１４はその深さが長手方向に短かいピツチで多
少変化したものとなる。 The metal tube 1 whose inner surface has been grooved is then passed through the finishing die 13, so that the irregularities on the outer surface disappear, the smoothness of the outer surface increases, and the outer diameter is finished to a predetermined size. In this case, the groove 1 corresponding to the convex part on the outer surface
The bottom of 4 will be slightly raised inward, so
The depth of the groove 14 varies somewhat in the longitudinal direction at short pitches.
このように本実施例の加工装置は、遊星回転す
る加工部材をロールから球に変えることにより、
溝加工に伴つて金属管１に生ずる応力を大幅に軽
減できるため、小径薄肉の銅管のように引張強さ
が比較的小さい金属管であつても溝付加工の速度
を増大させることができる。 In this way, the processing device of this embodiment changes the planetary-rotating processing member from a roll to a sphere.
Since the stress generated in the metal tube 1 due to grooving can be significantly reduced, the speed of grooving can be increased even for metal tubes with relatively low tensile strength, such as small-diameter, thin-walled copper tubes. .
勿論、複数の球１５で押圧して加工する場合、
金属管１と球１５が点接触に近い状態で接触する
ため、圧下力が大きくとれ、相対的に溝深さの大
きい内面溝付管を得やすいという副次的効果も期
待できる。そして、球１５により外面に形成され
る凹凸は内面に溝加工された管１を仕上ダイス１
３に通すことにより転移消失できるので、内面溝
付金属管の表面の平滑度を高めることができる。 Of course, when processing by pressing with a plurality of balls 15,
Since the metal tube 1 and the ball 15 are in close to point contact, a secondary effect can be expected that a large rolling force can be obtained and it is easy to obtain an internally grooved tube with a relatively large groove depth. Then, the unevenness formed on the outer surface by the balls 15 is removed by finishing the tube 1 with grooves on the inner surface.
3, the dislocation can be eliminated and the smoothness of the surface of the internally grooved metal tube can be improved.
内面溝付金属管は平滑管、即ち内面溝のない管
に比べて管内表面積が大幅に増加するので、管内
にフロンガスなどの冷媒を流し、それを沸騰、凝
縮により相変化させることにより管外流体との間
に熱交換を行う方式の空調機の熱交換器用伝熱管
等として好適である。 Metal pipes with internal grooves have a significantly increased inner surface area compared to smooth pipes, i.e. pipes without internal grooves, so by flowing a refrigerant such as fluorocarbon gas into the pipe and changing its phase through boiling and condensation, the fluid outside the pipe can be removed. It is suitable as a heat transfer tube for a heat exchanger of an air conditioner that exchanges heat between the tube and the like.
以上記述した如く本発明の加工装置によれば、
遊星回転する加工部材をロールから球に変えるこ
とにより、小径薄肉な金属管であつても内面の溝
加工を連続して高速で行うことができる利点があ
り、その実用価値は極めて大である。 According to the processing apparatus of the present invention as described above,
By changing the planetary rotating workpiece from a roll to a sphere, there is an advantage that even if it is a small-diameter, thin-walled metal tube, the inner surface can be grooved continuously at high speed, and its practical value is extremely large.
第１図は内面溝付金属管加工装置の先行例を示
す縦断面図、第２図は本発明に係る加工装置の縦
断面図、第３図は第２図の−矢視断面拡大
図、第４図は一本の溝に沿つた管壁部の断面を誇
張して示した説明図である。
１…金属管、３…タイロツド、４…フローテイ
ングプラク、５…溝付プラグ、７…引抜ダイス、
１３…仕上ダイス、１４…内面溝、１５…球、１
６…内周転動面、１７…回転ヘツド。
FIG. 1 is a longitudinal cross-sectional view showing a prior example of an internally grooved metal tube processing device, FIG. 2 is a longitudinal cross-sectional view of a processing device according to the present invention, and FIG. 3 is an enlarged cross-sectional view taken along the − arrow in FIG. FIG. 4 is an explanatory diagram showing an exaggerated cross section of the tube wall along one groove. 1... Metal tube, 3... Tie rod, 4... Floating plaque, 5... Grooved plug, 7... Drawing die,
13... Finishing die, 14... Inner groove, 15... Ball, 1
6... Inner rolling surface, 17... Rotating head.
Claims (1)
を施す装置であつて、引抜ダイス７と、該引抜ダ
イス７を通過する金属管１を前記引抜ダイス７と
協働して縮管するフローテイングプラグ４と、該
フローテイングプラグ４に連結され前記引抜ダイ
ス７を通過した金属管１内の所定位置に回転自在
に保持される内面溝加工用の溝付プラグ５と、該
溝付プラグ５が位置すべき部位の外周にあつて通
過する金属管１の外周面に接触しつつ遊星回転し
て前記金属管１を前記溝付プラグ５上へ押圧する
複数個の球１５と、内面に溝加工が施された金属
管１の外面を仕上げる仕上ダイス１３とから成
り、前記球１５の各々は、通過する金属管１の周
囲を回転する回転ヘツド１７に、回転自在に、か
つ該回転ヘツド１７の軸心から一定の距離に保持
されるように配置されていることを特徴とする内
面溝付金属管の加工装置。1 A device that continuously grooves the inner surface of a small-diameter, thin-walled metal tube, and includes a drawing die 7 and a metal tube 1 that passes through the drawing die 7, collaborating with the drawing die 7 to shrink the metal tube. A floating plug 4, a grooved plug 5 for machining an inner groove that is connected to the floating plug 4 and rotatably held at a predetermined position in the metal tube 1 that has passed through the drawing die 7, and the grooved plug. A plurality of balls 15 are arranged on the outer periphery of the part where the grooved plug 5 is to be located and rotate planetarily while contacting the outer circumferential surface of the metal tube 1 passing through the grooved plug 5 to press the metal tube 1 onto the grooved plug 5; and a finishing die 13 for finishing the outer surface of the metal tube 1 which has been grooved, and each of the balls 15 is rotatably attached to a rotating head 17 that rotates around the metal tube 1 passing through it. 17. An apparatus for processing a metal tube with an internal groove, characterized in that the apparatus is arranged so as to be held at a constant distance from the axis of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27559484A JPS60187425A (en) | 1984-12-28 | 1984-12-28 | Working device of inside grooved metallic tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27559484A JPS60187425A (en) | 1984-12-28 | 1984-12-28 | Working device of inside grooved metallic tube |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54010760A Division JPS5912365B2 (en) | 1979-02-01 | 1979-02-01 | Internally grooved metal tube processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187425A JPS60187425A (en) | 1985-09-24 |
| JPH0312967B2 true JPH0312967B2 (en) | 1991-02-21 |
Family
ID=17557620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27559484A Granted JPS60187425A (en) | 1984-12-28 | 1984-12-28 | Working device of inside grooved metallic tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60187425A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH077503B2 (en) * | 1985-10-24 | 1995-01-30 | ティーディーケイ株式会社 | Magnetic recording medium and manufacturing method thereof |
| FR2707534B1 (en) * | 1993-07-16 | 1995-09-15 | Trefimetaux | Grooving devices for tubes. |
| US7861571B1 (en) | 2008-11-10 | 2011-01-04 | Vincent Giaimo | Trapped ball draw process for reducing the diameter of tubing |
-
1984
- 1984-12-28 JP JP27559484A patent/JPS60187425A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187425A (en) | 1985-09-24 |
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