JPS58184021A - Pipe bending device - Google Patents

Pipe bending device

Info

Publication number
JPS58184021A
JPS58184021A JP6709582A JP6709582A JPS58184021A JP S58184021 A JPS58184021 A JP S58184021A JP 6709582 A JP6709582 A JP 6709582A JP 6709582 A JP6709582 A JP 6709582A JP S58184021 A JPS58184021 A JP S58184021A
Authority
JP
Japan
Prior art keywords
pipe
mold
jack
support
beams
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.)
Granted
Application number
JP6709582A
Other languages
Japanese (ja)
Other versions
JPH038851B2 (en
Inventor
Toshio Yamaguchi
俊夫 山口
Isao Iijima
飯島 功
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIKKEN KOUMU KK
Nippon Steel Corp
Original Assignee
NIKKEN KOUMU KK
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIKKEN KOUMU KK, Nippon Steel Corp filed Critical NIKKEN KOUMU KK
Priority to JP6709582A priority Critical patent/JPS58184021A/en
Publication of JPS58184021A publication Critical patent/JPS58184021A/en
Publication of JPH038851B2 publication Critical patent/JPH038851B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/06Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

PURPOSE:To make a titled device compact and light, by making respective beams of a main part of the device free from generating a bending stress. CONSTITUTION:A pipe 10 to be bent is inserted through a pipe press die 9 as well as is fitted to respective pipe holding dies 2 and 4. A hydraulic jack 7 is stretched to move joints 14 and 16 in the direction of separating the joints 14 and 16 from each other, and respective supporting beams 3 and 5 are turned in the direction of being separated from each other around respective supporting shafts 12 and 13 set as the turning centers. Respective beams 6 and 8 for moving the die 9 and a supporting shaft 24 to which a cross joint is pivotally jointed are moved together in the direction of approaching the jack 7, and the die 9 also moves in the direction of approaching the jack 7 by the cross joint through lock arms 26. Accordingly, a pressing force P is added to the pipe 10, and reactions R1 and R2 are added to the pipe by the dies 14 and 16, to bend the pipe 10.

Description

【発明の詳細な説明】 この発明はパイプ曲げ加工装置の改良に関するものであ
る。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a pipe bending device.

従来のパイプ曲げ加工装置の場合は、パイプの曲げの際
に発生するーげ反力を受けるための構造部材の重量が大
きいので曲げ加工装置全体の重量が大きく取扱いが困難
であった。またパイプ曲げ加工の際はパイプ断面が扁平
化するが、従来のパイプ曲げ加工装置では、このパイプ
扁平化を有効に防止できるものがなかった。
In the case of a conventional pipe bending device, the weight of the structural members for receiving the reaction force generated during pipe bending is large, so the entire bending device is heavy and difficult to handle. Furthermore, when bending a pipe, the cross section of the pipe becomes flattened, but none of the conventional pipe bending devices can effectively prevent this flattening of the pipe.

この発明は、前記従来のパイプ曲は加工装置における前
述の欠点を改善し、軽量、小型で運搬容易なパイプ曲げ
加工装置を提供することを目的とするものである。
The object of the present invention is to improve the above-mentioned drawbacks of the conventional pipe bending apparatus and to provide a pipe bending apparatus that is lightweight, compact, and easy to transport.

次にこの発明を図示の例によって詳細に説明する。Next, the present invention will be explained in detail using illustrated examples.

図面はこの発明の一実施例を示すものであって、曲げ加
工されるパイプ10の長手方向Km長する2本の支持用
ビーム1が間隔をおいて平行に配置され、各支持用ビー
ム1の一端部の間および他端部の間には、半円形のパイ
プ嵌合溝11を有するパイプ受型2および4が配置され
、各支持用ビーム1の一端部とそれらの外側に配置され
た支承用ビーム3の一端部と前記パイプ受型2とは、そ
れらにわたって貫通されたボルトからなる支軸12によ
り枢着され、かつ各支持用ビーム1の他端部。
The drawing shows an embodiment of the present invention, in which two supporting beams 1 each having a length of Km in the longitudinal direction of a pipe 10 to be bent are arranged in parallel with a distance between each supporting beam 1. Pipe holders 2 and 4 having semicircular pipe fitting grooves 11 are disposed between one end and the other end, and one end of each support beam 1 and a support disposed outside thereof One end of the support beam 3 and the pipe receiving mold 2 are pivotally connected by a support shaft 12 made of a bolt passed through them, and the other end of each support beam 1.

とそれらの外側に配置され九支承用ビーム5の一端部と
前記パイプ受fi4と杜、それらにわたって貫通された
ボルトからなる支軸13により枢着されている。
and one end of the nine supporting beams 5 disposed outside of them, the pipe support fi4 and the pipe holder fi4, and the support shaft 13 made of a bolt passed through them.

前記支承用ビーム30倫端部とその中間に配置されたジ
ヤツキ受座14との間に押型移動用ビーム6の一端部が
介在され、支承用ビーム3の他端部および押型移動用ビ
ーム6の一端部とジヤツキ受座14とは、それらのビー
ムに挿通されてジヤツキ受座14に螺合され九ボルトか
らなる支軸15によシ枢着され、かつ前記支承用ビーム
5の他端部とその中間に配置されたジヤツキ受座16と
の間に押型移動用ビーム8の一端部が介在され、支承用
ビーム5の他端部およびllliImll用ビーム8の
一端部とジヤツキ受座16とは、それらのビームに挿通
されてジヤツキ受座16に螺合されたボルトからなる支
軸17によ)枢着され、さらに前記支持用ビーム1と平
行に蔦長する液圧ジヤツキ7の一端部および他端部は前
記ジヤツキ受座14および16に連結されている。
One end of the press die moving beam 6 is interposed between the end of the support beam 30 and the jack seat 14 disposed in between, and the other end of the support beam 3 and the press die moving beam 6 are One end portion and the jack seat 14 are inserted through these beams, screwed into the jack seat 14, and pivotally connected to a support shaft 15 made of nine bolts, and are connected to the other end portion of the support beam 5. One end of the press die moving beam 8 is interposed between the jacking seat 16 arranged in the middle, and the other end of the supporting beam 5, one end of the llliImll beam 8, and the jacking seat 16, One end of the hydraulic jack 7 is pivotally connected (by a support shaft 17 made of a bolt inserted through these beams and screwed into the jack seat 16), and further has a rib extending parallel to the support beam 1. The ends are connected to the jack seats 14 and 16.

液圧ジヤツキ7におけるシリンダ18の一端部および他
端部に設けられ九液圧ボート19および20は、液圧ホ
ース21および22と切換弁とを介して液圧発生装置に
接続され、シリンダ18の一端から圧液を供給して他端
部から排液すると液圧ジヤツキ7が伸長され、またシリ
ンダ18の他端部から圧液を供給して一端部から排液す
ると液圧ジヤツキ7が短縮される。
Hydraulic boats 19 and 20 provided at one end and the other end of cylinder 18 in hydraulic jack 7 are connected to a hydraulic pressure generator via hydraulic hoses 21 and 22 and a switching valve, and When pressurized liquid is supplied from one end and drained from the other end, the hydraulic jack 7 is extended, and when pressurized liquid is supplied from the other end of the cylinder 18 and drained from one end, the hydraulic jack 7 is shortened. Ru.

前記各押型移動用ビーム6.8の他端部・とクロスジヨ
イント26とは、各ビーム6.8に挿通されてクロスシ
ラインド23に螺合されたボルトからなる支軸24によ
り枢着され、かつクロスジ曹インド260両側面には一
対のクランプアーム・::lll・ 25.26の一端部が配置され、各クランプアーム25
,26の一端部とクロスシラインド26とは、それらの
クランプアーム25,26に挿通されてクロスジ嘗イン
ド23に螺合されたボルトからなる支軸27により枢着
され、その支軸27は支持用ビーム1と平行であり、ま
た支軸24.27社互いに直角になっている。
The other end of each press mold moving beam 6.8 and the cross joint 26 are pivotally connected to each other by a support shaft 24 made of a bolt inserted through each beam 6.8 and screwed to the cross shield 23. , and one end of a pair of clamp arms 25.26 is arranged on both sides of the cross-arm India 260, and each clamp arm 25
, 26 and the cross shield 26 are pivotally connected by a support shaft 27 consisting of a bolt inserted through the clamp arms 25 and 26 and screwed to the cross shield 23. The supporting beams 24 and 27 are parallel to each other and at right angles to each other.

半円形のパイプ嵌合溝28を有する一対の押型構成片2
9.!tOの一端部と前記各クランプアーム25,26
とは、それらのクランプアームに押通されたボルトから
なる支軸31.32にょ夛枢着され、かつ前記各押型構
成片29.30の他端部に設けられた溝にわたってとン
ジプレート36が嵌入され、各押型構成片29,30−
の他端部とヒンジプレート36の端部とは、それらにわ
たって挿通されたボルトからなる支軸54.55により
枢着され、前記支軸31,32,54.35は支軸27
と平行になってお〕、さらに各押型構成片29.30と
各支持用ビーム1との間には、各押型構成片29.30
の拡開回動を許容するための間隔が設けられ、またヒン
ジプレート66および支軸34.55によシ連結された
押型構成片29.30によりパイプ恢合孔を有する分割
蓋のパイプ押型9が構成されている。
A pair of press mold constituent pieces 2 having semicircular pipe fitting grooves 28
9. ! One end of tO and each of the clamp arms 25, 26
This means that the hinge plate 36 is pivotally attached to the support shafts 31 and 32 made of bolts pushed through the clamp arms, and spans the groove provided at the other end of each of the pressing mold component pieces 29 and 30. Each of the mold constituent pieces 29, 30-
The other end and the end of the hinge plate 36 are pivotally connected to each other by a support shaft 54.55 made of a bolt passed through them, and the support shafts 31, 32, 54.35
In addition, between each mold component piece 29.30 and each support beam 1, each mold component piece 29.30 is parallel to
The pipe mold 9 of the split lid has a pipe adjustment hole formed by a mold component 29.30 connected to the hinge plate 66 and the support shaft 34.55. is configured.

押型構成片29が押蓋構成片30と対向する部分には、
その対向面に直角な方向に凰長する複数のずれ止め用ピ
ン36が配置され、そのビン56の一端部は一方の押型
構成片29に嵌挿固定され、かつそのビン56の他端部
は他方の押型構成片50に設けられたガイド孔に摺動自
在に嵌挿されている。したがって、押型構成片29.3
0は、液圧ジヤツキ7の中心線およびパイプ10の中心
線を含む平面に直角な方向に相対的に移動することはで
きるが、前記平面に平行な方向に相対的に移動すること
はできない。すなわち、前記ビン36は各押型構成片2
9.30の相対的ずれを防止する役割を果たしている。
In the part where the press mold component 29 faces the press cover component 30,
A plurality of anti-slip pins 36 extending vertically in the direction perpendicular to the opposing surfaces are disposed, one end of the pin 56 is fitted into and fixed to one of the pressing mold constituent pieces 29, and the other end of the pin 56 is fixed. It is slidably inserted into a guide hole provided in the other mold component piece 50. Therefore, the mold component piece 29.3
0 can move relatively in a direction perpendicular to a plane containing the centerline of the hydraulic jack 7 and the centerline of the pipe 10, but cannot move relatively in a direction parallel to said plane. That is, the bin 36 is attached to each stamping mold component piece 2.
It plays the role of preventing relative deviation of 9.30.

なおこの実施例においては1曲げの動力源として液圧ジ
ヤツキを使用しているが、液圧ジヤツキに代えてスクリ
ュウジヤツキを使用してもよい。
In this embodiment, a hydraulic jack is used as the power source for one bend, but a screw jack may be used instead of the hydraulic jack.

次に前記実施例のパイプ曲げ加工装置の作動について説
明する。
Next, the operation of the pipe bending apparatus of the above embodiment will be explained.

曲げ加工されるパイプ10が、パイプ押型9に挿通され
ると共に各パイプ受型2,4に嵌合されたのち、液圧ジ
ヤツキ7が伸長されて、各ジヤツキ受座14.16が相
互に離反する方向に移動され、そのため各支承ビーム3
,5が支軸12,13を中心として相互に離反する方向
に回動され、かつ各押型移動用ビーム6.8とクロスジ
冒インド23とを枢着している支軸24が液圧ジヤツキ
7に接近する方向に移動されると共に、そのクロスジ璽
インド23によりロックアーム25.26を介してパイ
プ押型9が液圧ジヤツキ7に接近する方向に移動される
After the pipe 10 to be bent is inserted into the pipe mold 9 and fitted into each pipe receiving mold 2, 4, the hydraulic jack 7 is extended and the jack seats 14, 16 are separated from each other. so that each bearing beam 3
, 5 are rotated in directions away from each other about the support shafts 12 and 13, and the support shaft 24, which pivotally connects each of the pressing die moving beams 6.8 and the cross-jet insert 23, is connected to the hydraulic jack 7. At the same time, the pipe die 9 is moved in the direction closer to the hydraulic jack 7 via the lock arms 25 and 26 by the cross-judge 23.

したがって、パイプ10に対し、パイプ押型9により押
圧力Pが与えられると共に、パイプ受型14.16によ
シ反力R* 、 R*が与えられ、かつこれらの力の間
にはP = R1+ R1の関係があシ、それらの力に
よってパイプ10に曲げ加工が施される。この場合、パ
イプ10における押圧力作用部分はパイプ押型9のパイ
プ嵌合孔に嵌合され、かつ押型移動用ビーム6.8によ
るクロスジ習インド23の引張力はクランプアーム25
,26を介して各押型構成片29.50を閉止する力と
しても作用するので、パイプ抑圧部の断面の扁平化すな
わち楕円化が確実に拘束される。
Therefore, a pressing force P is applied to the pipe 10 by the pipe mold 9, and reaction forces R* and R* are applied to the pipe receiving mold 14.16, and between these forces, P = R1+ There is a relationship R1, and the pipe 10 is bent by these forces. In this case, the pressing force acting portion of the pipe 10 is fitted into the pipe fitting hole of the pipe mold 9, and the tensile force of the cross joint 23 by the mold moving beam 6.8 is applied to the clamp arm 25.
, 26 also act as a force for closing each of the mold component pieces 29, 50, thereby reliably restraining flattening, that is, ovalization, of the cross section of the pipe suppressing portion.

またパイプ嵌合孔を有するパイプ押型が非分割型である
場合は、パイプ曲げ加工後にパイプがパイプ押型のパイ
プ嵌合孔に圧接された状態になるので、パイプをパイプ
押型から抜取る際に、引抜用器具等を用いてパイプを引
抜くという煩雑な作業を必要とするが、前記実施例の場
合は、曲げ加工終了後に液圧ジヤツキ7を短縮していく
と、前記支承用ビーム3,5および押型移動用ビーム6
゜8が曲げ加工の場合と逆方向に回動し、かつクロスジ
ヨイント26が液圧ジヤツキ7から離反する方向に移動
され、そのクロスジ冒インド25によシクラ/プアーム
25.26を介して各押型構成片29.30が支軸54
.55を中心として開放方向に回動されるので、曲は加
工されたパイプ10をパイプ押型9から容易に抜取るこ
とができる。
In addition, if the pipe mold having a pipe fitting hole is a non-dividing type, the pipe will be in a state of pressure contact with the pipe fitting hole of the pipe mold after the pipe bending process, so when removing the pipe from the pipe mold, Although the complicated work of pulling out the pipe using a pulling tool or the like is required, in the case of the above embodiment, if the hydraulic jack 7 is shortened after the bending process is completed, the supporting beams 3, 5 and beam for moving mold 6
8 is rotated in the opposite direction to the bending process, and the cross joint 26 is moved in a direction away from the hydraulic jack 7, and the cross joint 25 is rotated in the opposite direction to the bending process. The mold component pieces 29 and 30 are the support shafts 54
.. 55 in the opening direction, the curved pipe 10 can be easily removed from the pipe mold 9.

この発明を実施す為場合、各押型構成片29゜60をボ
ルトにより相互に結合すると共に、クロスジ冒インド2
6に対し連結部材により連結してもよい。
In order to carry out this invention, each of the pressing mold component pieces 29 and 60 are connected to each other with bolts, and the cross-shaped insert 2
6 may be connected by a connecting member.

この発明によれば、液圧ジヤツキ7を伸長してパイプ1
0に曲げ加工を施す場合、支持用ビーム1および押型移
動用ビーム6.8に引張応力のみが発生すると共に、支
承用ビーム3.5に圧縮応力のみが発生し、パイプ曲げ
加工装置の主要部分。
According to this invention, the hydraulic jack 7 is extended and the pipe 1
0, only tensile stress is generated in the support beam 1 and the die moving beam 6.8, and only compressive stress is generated in the support beam 3.5, which is the main part of the pipe bending equipment. .

である前記各ビームに曲げ応力が発生しないので、各ビ
ームの断面を小さくしてパイプ曲は加工装置を小型軽量
化することができ、がっ液圧ジヤツキ7はパイプ10に
対し平行に配置されることになるので、液圧ジヤツキを
パイプに対し直角に配置する場合に比べて、パイプに直
角な方向のパイプ曲げ加工装置の寸法を小さくすること
ができ、さらにパイプ10はパイプ押型9のパイプ嵌合
孔に嵌合されて扁平化が拘束された状態で抑圧−は加工
されるので、曲は加工の際にパイプの断面が扁平化すな
わち楕円化するのを確実に防止できる等の効果が得られ
る。
Since no bending stress is generated in each of the beams, the cross section of each beam can be made smaller to reduce the size and weight of the pipe processing equipment, and the hydraulic jack 7 is arranged parallel to the pipe 10. Therefore, the dimensions of the pipe bending device in the direction perpendicular to the pipe can be made smaller than when the hydraulic jack is arranged perpendicular to the pipe. Since the pipe is machined while being fitted into the fitting hole and flattening is restrained, the pipe has the effect of reliably preventing the cross section of the pipe from becoming flattened, that is, oval, during bending. can get.

【図面の簡単な説明】[Brief explanation of drawings]

区間はこの発明の一実施例を示すものであって、第1図
はパイプ曲げ加工装置の正面図、第2図はその側面図、
第8図はパイプ押型付近を示す側面図、第4図はその一
部切欠正面図、第5図はパイプ受型付近を示す側面図で
ある。 図において、1は支持用ビーム、2はパイプ受型、3は
支承用ビーム、4はパイプ受型、5は支承用ビーム、6
は押型移動用ビーム、7は液圧ジヤツキ、8は押型移動
用ビーム、9社パイプ押型、10はパイプ、11はパイ
プ嵌合溝、14および16はジヤツキ受座、23はクロ
スジ冒インド、25および26はクランプアーム、28
はパイプ嵌合溝、29および60は押型構成片、33は
ヒンジプレートである。
The sections show one embodiment of the present invention, in which FIG. 1 is a front view of a pipe bending device, FIG. 2 is a side view thereof,
FIG. 8 is a side view showing the vicinity of the pipe mold, FIG. 4 is a partially cutaway front view thereof, and FIG. 5 is a side view showing the vicinity of the pipe receiving mold. In the figure, 1 is a support beam, 2 is a pipe support mold, 3 is a support beam, 4 is a pipe support mold, 5 is a support beam, 6
1 is a beam for moving the press mold, 7 is a hydraulic jack, 8 is a beam for moving the press mold, 9 is a pipe press mold, 10 is a pipe, 11 is a pipe fitting groove, 14 and 16 are jack seats, 23 is a cross screw insert, 25 and 26 is a clamp arm, 28
is a pipe fitting groove, 29 and 60 are pressing mold components, and 33 is a hinge plate.

Claims (1)

【特許請求の範囲】[Claims] 支持用ビーム1の一端部にパイプ受W2および支承用ビ
ーム3の一端部が枢着され、支持゛用ビーム1の他端部
にパイプ受型4および支承用ビーム5の一端部が枢着さ
れ、一方の支承用ビーム3の他端部に押型移動用ビーム
6の一端部が連結されると、共にジヤツキ7の一端部が
連結され、他方の支持用ビーム5の他端部には、押型移
動用ビーム8の一端部が枢着されると共にジヤツキ7の
他端部が°枢着され、パイプ恢合孔を有する分割型のパ
イプ押型9は前記パイプ受112,4の中間部に配置さ
れ、そのパイプ押型9に前記各押型移動用ビーム6.8
の他端部が連結されていることを特徴とするパイプ曲げ
加工装置。
One end of a pipe support W2 and a support beam 3 are pivotally connected to one end of the support beam 1, and a pipe support mold 4 and one end of a support beam 5 are pivotally connected to the other end of the support beam 1. When one end of the press mold moving beam 6 is connected to the other end of one support beam 3, one end of the jack 7 is connected to the other end of the other support beam 5, and the press mold is connected to the other end of the support beam 5. One end of the moving beam 8 is pivotally connected, and the other end of the jack 7 is pivotally connected, and a split pipe mold 9 having a pipe adjustment hole is disposed in the middle of the pipe receivers 112 and 4. , each of the press die moving beams 6.8 is attached to the pipe press die 9.
A pipe bending device characterized in that the other end is connected.
JP6709582A 1982-04-23 1982-04-23 Pipe bending device Granted JPS58184021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6709582A JPS58184021A (en) 1982-04-23 1982-04-23 Pipe bending device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6709582A JPS58184021A (en) 1982-04-23 1982-04-23 Pipe bending device

Publications (2)

Publication Number Publication Date
JPS58184021A true JPS58184021A (en) 1983-10-27
JPH038851B2 JPH038851B2 (en) 1991-02-07

Family

ID=13334974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6709582A Granted JPS58184021A (en) 1982-04-23 1982-04-23 Pipe bending device

Country Status (1)

Country Link
JP (1) JPS58184021A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469730A (en) * 1994-10-13 1995-11-28 Heaman; Norman L. Pipe bending machine
US5600993A (en) * 1995-10-30 1997-02-11 Heaman; Norman L. Flexible shoe for a bending machine
JP2008151216A (en) * 2006-12-15 2008-07-03 Jtekt Corp Thrust roller bearing
CN106180490A (en) * 2016-08-31 2016-12-07 合肥英腾嘉科技发展有限责任公司 A kind of lossless cutting knife for contact wire cutting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50137860A (en) * 1974-04-24 1975-11-01
JPS56136232A (en) * 1980-03-27 1981-10-24 Yasunori Taira Pipe bender

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50137860A (en) * 1974-04-24 1975-11-01
JPS56136232A (en) * 1980-03-27 1981-10-24 Yasunori Taira Pipe bender

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469730A (en) * 1994-10-13 1995-11-28 Heaman; Norman L. Pipe bending machine
US5600993A (en) * 1995-10-30 1997-02-11 Heaman; Norman L. Flexible shoe for a bending machine
JP2008151216A (en) * 2006-12-15 2008-07-03 Jtekt Corp Thrust roller bearing
CN106180490A (en) * 2016-08-31 2016-12-07 合肥英腾嘉科技发展有限责任公司 A kind of lossless cutting knife for contact wire cutting

Also Published As

Publication number Publication date
JPH038851B2 (en) 1991-02-07

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