JPH02152740A - Electric discharging device - Google Patents

Electric discharging device

Info

Publication number
JPH02152740A
JPH02152740A JP30569588A JP30569588A JPH02152740A JP H02152740 A JPH02152740 A JP H02152740A JP 30569588 A JP30569588 A JP 30569588A JP 30569588 A JP30569588 A JP 30569588A JP H02152740 A JPH02152740 A JP H02152740A
Authority
JP
Japan
Prior art keywords
ram
balancer
saddle
head
workpiece
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
Application number
JP30569588A
Other languages
Japanese (ja)
Inventor
Hisakazu Matsuda
松田 久和
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP30569588A priority Critical patent/JPH02152740A/en
Publication of JPH02152740A publication Critical patent/JPH02152740A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/001Arrangements compensating weight or flexion on parts of the machine

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

PURPOSE:To rectify the inclination of moment by the movement of a ram and to obtain a high positional accuracy by providing a driving means for synchronously moving ram and balancer in the opposite direction by rotating a screw shaft. CONSTITUTION:When a screw shaft 13 is rotated by a driving motor 16, a ram 6 is moved via a ball screw nut 14 according to the rotation of a feeding screw part 13a and a balancer 10 is moved as well by synchronizing in the opposite direction to the ram 6 according to the rotation of a reverse screw part 13b via a ball screw nut 15. So that, the moments W1, L1 generated at the head 8 side and the moments W2, L2 generated at the balancer 10 side coincide at all times and the force applied on a Y axis guide unit 5 becomes F1=F2 at any moving position in the X axial direction of the ram 6. Consequently the displacement of the Y axial guide unit 5 becomes a constant amt. at all times and no inclination is caused on the ram 6 and head 8.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、対向する電極と被加工物との間に放電を発
生させて、被加工物の加工を行う放電加工装置に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric discharge machining apparatus that processes a workpiece by generating electric discharge between opposing electrodes and the workpiece.

[従来の技術] 従来のこの種の放電加工装置としては、例えば、第3図
および第4図に示すような構成を挙げることができる。
[Prior Art] As a conventional electrical discharge machining apparatus of this type, for example, a configuration as shown in FIGS. 3 and 4 can be mentioned.

第3図は従来の放電加工装置の正面図、第4図はラムが
X方向に所定量移動された状態を示す正面図である。
FIG. 3 is a front view of a conventional electric discharge machining apparatus, and FIG. 4 is a front view showing a state in which the ram has been moved by a predetermined amount in the X direction.

図において、(1)はベッド、(2)はベッド(1)上
に装着されたテーブル、(3)はテーブル(2)上に支
持された加工槽であり、その内部には被加工物が収容さ
れている。(4)はベッド(1)上にY軸ガイドユニッ
ト(5)を介して水平面内のY軸方向へ移動可能に支持
されたサドル、(6)はサドル(4)上にX軸ガイドユ
ニット(7)を介してサドル(4)の移動方向と直交す
るX軸方向へ移動可能に支持されたラム、(8)はラム
(6)に装着されたヘッドであり、その下部には放電電
極(9)が被加工物と対向するように支持されている。
In the figure, (1) is a bed, (2) is a table mounted on the bed (1), and (3) is a processing tank supported on the table (2), inside of which is a workpiece. It is accommodated. (4) is a saddle supported on the bed (1) via a Y-axis guide unit (5) so as to be movable in the Y-axis direction in a horizontal plane, and (6) is an X-axis guide unit ( A ram (7) is supported so as to be movable in the X-axis direction perpendicular to the direction of movement of the saddle (4). (8) is a head attached to the ram (6), and a discharge electrode ( 9) is supported so as to face the workpiece.

次に、上記のように構成された従来の放電加工装置につ
いて動作を説明する。
Next, the operation of the conventional electric discharge machining apparatus configured as described above will be explained.

被加工物の放電加工時には、図示しないサーボ送り機構
等により、ラム(6)がサドル(4)上でXIIIIガ
イドユニット(7)を介してX軸方向へ移動されると共
に、サドル(4)がベッド(1)上でY軸ガイドユニッ
ト(5)を介してY軸方向へ移動され、放電電極(9)
を支持したヘッド(8)がX軸方向へおよび/またはY
軸方向へサーボ送りされる。
During electric discharge machining of a workpiece, the ram (6) is moved in the X-axis direction on the saddle (4) via the XIII guide unit (7) by a servo feed mechanism (not shown), and the saddle (4) is The discharge electrode (9) is moved in the Y-axis direction on the bed (1) via the Y-axis guide unit (5).
The head (8) supporting the
Servo feed in the axial direction.

[発明が解決しようとする課題] ところが、この従来の放電加工装置においては、第4図
に示すように、ラム(6)がX軸方向へ移動されるのに
ともない、Y軸ガイドユニット(5)に加わる力(Fl
、F2)が不均等になって、Y軸ガイドユニット(5)
の変位量に相対差が発生し、ヘッド(8)およびラム(
6)が傾斜(角度θ)して、ラム(6)のX軸方向への
送り精度に誤差が生じた。
[Problems to be Solved by the Invention] However, in this conventional electric discharge machining apparatus, as the ram (6) is moved in the X-axis direction, the Y-axis guide unit (5) ) is applied to the force (Fl
, F2) become uneven, and the Y-axis guide unit (5)
A relative difference occurs in the amount of displacement of the head (8) and the ram (
6) was tilted (angle θ), and an error occurred in the feeding accuracy of the ram (6) in the X-axis direction.

そこで、この発明は、ラムの移動に伴うモーメントの片
寄りを是正して、高い位置決め精度を得ることができる
放電加工装置の提供を課題とするものである。
SUMMARY OF THE INVENTION An object of the present invention is to provide an electric discharge machining apparatus that can correct the deviation of the moment caused by the movement of the ram and obtain high positioning accuracy.

[課題を解決するための手段] この発明にかかる放電加工装置は、被加工物を支持する
ベッド上にサドルを移動可能に支持し、そのサドルの移
動方向と直交する方向へ移動可能にラムを支持し、前記
ラムには前記被加工物と対向する電極を支持したヘッド
を装着し、前記ラムの移動方向と反対方向に移動可能に
支持し、前記サドル上にはラムおよびバランサに係合す
るネジ軸を回転可能に支持し、ネジ軸を回転させてラム
およびバランサを反対方向へ同期移動させるための駆動
手段を設けたものである。
[Means for Solving the Problems] An electrical discharge machining apparatus according to the present invention includes a bed that supports a workpiece, a saddle that is movably supported, and a ram that is movable in a direction perpendicular to the direction of movement of the saddle. A head supporting an electrode facing the workpiece is mounted on the ram, the head is supported movably in a direction opposite to the moving direction of the ram, and a head is mounted on the saddle to engage with the ram and a balancer. A screw shaft is rotatably supported, and driving means is provided for rotating the screw shaft and moving the ram and balancer in opposite directions in synchronization.

[作用] この発明においては、被加工物の放電加工時に、駆動手
段によりネジ軸が回転されると、ラムとバランサがそれ
ぞれ反対方向に同期して移動される。
[Operation] In the present invention, when the screw shaft is rotated by the driving means during electrical discharge machining of the workpiece, the ram and the balancer are moved in opposite directions in synchronization.

そのため、左右のモーメントが等価になり、サドルを支
持するガイドユニット等に加わる力が均等化されて、ラ
ムの移動にともなってラムおよびヘッドに生じる傾きを
防止できる。
Therefore, the moments on the left and right sides become equal, and the forces applied to the guide unit supporting the saddle are equalized, making it possible to prevent the ram and head from tilting as the ram moves.

[実施例] 以下、この発明の実施例を図面に基づいて説明する。[Example] Embodiments of the present invention will be described below based on the drawings.

第1図はこの発明の一実施例による放電加工装置の正面
図、第2図はその側面図である。なお、図中、第3図お
よび第4図の従来例と同一符号および同一記号は、前述
した従来例の構成部分と同一または相当する部分を示す
ものであるため、ここでは重複する説明を省略する。
FIG. 1 is a front view of an electric discharge machining apparatus according to an embodiment of the present invention, and FIG. 2 is a side view thereof. Note that in the figures, the same reference numerals and symbols as those in the conventional example in FIGS. 3 and 4 indicate the same or corresponding parts as those in the conventional example described above, and therefore, duplicate explanations will be omitted here. do.

図において、(10)はラム(6)上にガイドユニッ1
−(11)を介してラム(6)の移動方向と同一のX軸
方向へ移動可能に支持されたバランサ、(12)はバラ
ンサ(10)の先端下面に取付けられた重りであり、ラ
ム(6)のヘッド(8)側の重量と等価の重量を有して
いる。(13)はサドル(4)上に回転可能に支持され
たX軸方向に延びるボールネジ軸、(13a)はネジ軸
(13)の−側外周に形成された右ネジ状の送りネジ部
、(13b)はネジ軸(13)の他側外周に形成された
左ネジ状の逆ネジ部である。
In the figure, (10) is the guide unit 1 on the ram (6).
- (12) is a weight attached to the bottom surface of the tip of the balancer (10); It has a weight equivalent to the weight on the head (8) side of 6). (13) is a ball screw shaft rotatably supported on the saddle (4) and extends in the X-axis direction; (13a) is a right-handed threaded feed screw portion formed on the negative side outer periphery of the screw shaft (13); 13b) is a left-handed reverse threaded portion formed on the other side outer periphery of the threaded shaft (13).

(14)は前記送りネジ部(13a)と螺合するように
ラム(6)の下部に設けられたポールネジナツト、(1
5)は逆ネジ部(13b)と螺合するようにバランサ(
10)の下部に設けられたポールネジナツト、(16)
はサドル(4)上に装着された駆動手段としての駆動用
モータであり、この駆動用モータ(16)によって前記
ネジ軸(13)が回転駆動される。なお、(17)はY
軸方向に延びるボールネジ軸である。
(14) is a pole screw nut provided at the lower part of the ram (6) so as to be screwed into the feed screw portion (13a);
5) is a balancer (
10) Pole screw nut provided at the bottom of (16)
is a drive motor as a drive means mounted on the saddle (4), and the screw shaft (13) is rotationally driven by this drive motor (16). Note that (17) is Y
This is a ball screw shaft that extends in the axial direction.

次に、上記のように構成されたこの実施例の放型加工装
置の動作を説明する。
Next, the operation of the mold release processing apparatus of this embodiment configured as described above will be explained.

被加工物の放電加工時において、駆動用モータ(16)
によりネジ軸(13)が回転されると、送りネジ部(1
3a)の回転にともないポールネジナツト(14)を介
してラム(6)が移動されると共に、逆ネジ部(13b
)の回転にともないポールネジナツト(15)を介して
バランサ(10)がラム(6)と反対方向へ同期して移
動される。そのために、ヘッド(8)側に発生するモー
メント(Wl・Ll)と、バランサ(10)側に発生す
るモーメント(W2・L2)とが常に一致し、Y軸ガイ
ドユニット(5)に加わる力は、ラム(6)のX軸方向
のいずれの移動位置においても(F1=F2)となる。
During electrical discharge machining of the workpiece, the drive motor (16)
When the screw shaft (13) is rotated by
3a), the ram (6) is moved via the pole screw nut (14), and the reverse threaded portion (13b) is moved.
), the balancer (10) is synchronously moved in the opposite direction to the ram (6) via the pole screw nut (15). Therefore, the moment (Wl, Ll) generated on the head (8) side always matches the moment (W2, L2) generated on the balancer (10) side, and the force applied to the Y-axis guide unit (5) is , (F1=F2) at any movement position of the ram (6) in the X-axis direction.

したがって、Y軸ガイドユニット(5)の変位は常に一
定量となり、ラム(6)およびヘッド(8)に傾きが生
じることはない。
Therefore, the displacement of the Y-axis guide unit (5) is always constant, and the ram (6) and head (8) are never tilted.

このように、」1記実施例の放電加工装置は、被加工物
を支持するベッド(1)と、ベッド(1)上にY軸方向
へ移動可能に支持されたサドル(4)と、サドル(4)
上にサドル(4)の移動方向と直交するX軸方向へ移動
可能に支持されたラム(6)と、ラム(6)に装着され
前記被加工物と対向する電極(9)を支持したヘッド(
8)と、前記ラム(6)上にラム(6)の移動方向と同
一のX軸方向へ移動可能に支持されたバランサ(10)
と、前記サドル(4)上に回転可能に支持されラム(6
)およびバランサ(10)に螺合する送りネジ部(13
a)および逆ネジ部(13b)を有するネジ軸(13)
と、ネジ軸(13)を回転させてラム(6)およびバラ
ンサ(10)を反対方向へ同期的に移動させるための駆
動手段としての駆動用モータ(16)とから構成したも
のである。
In this manner, the electric discharge machining apparatus of the first embodiment includes a bed (1) that supports a workpiece, a saddle (4) supported movably in the Y-axis direction on the bed (1), and a saddle (4) that is movably supported on the bed (1). (4)
A ram (6) supported above so as to be movable in the X-axis direction perpendicular to the moving direction of the saddle (4), and a head supporting an electrode (9) mounted on the ram (6) and facing the workpiece. (
8), and a balancer (10) supported on the ram (6) so as to be movable in the X-axis direction that is the same as the moving direction of the ram (6).
and a ram (6) rotatably supported on the saddle (4).
) and the feed screw part (13) that screws into the balancer (10).
a) and a threaded shaft (13) having a reverse threaded portion (13b)
and a drive motor (16) as a drive means for rotating the screw shaft (13) and synchronously moving the ram (6) and balancer (10) in opposite directions.

したがって、被加工物の放電加工時に、駆動用モータ(
16)によりネジ軸(13)が回転されると、ラム(6
)とバランサ(10)がそれぞれ反対方向に同期して移
動され、左右のモーメントが等価になって、サドル(4
)を支持するYfthガイドユニット(5)に加わる力
が均等化される。
Therefore, during electrical discharge machining of the workpiece, the drive motor (
When the screw shaft (13) is rotated by the ram (6)
) and balancer (10) are moved in opposite directions in synchronization, the left and right moments become equal, and the saddle (4
) is equalized in the force applied to the Yfth guide unit (5) supporting the

このため、ラム(6)の移動にともないラム(6)およ
びヘッド(8)に傾きが生じることはなく、高い位置決
め精度を得ることができる。
Therefore, the ram (6) and the head (8) do not tilt as the ram (6) moves, and high positioning accuracy can be achieved.

なお、上記実施例では、バランサ(10)がラム(6)
 J二に支持されているが、このバランサ(10)はサ
ドル(4)上に移動可能に支持した構成としてもよい。
In addition, in the above embodiment, the balancer (10) is the ram (6).
Although the balancer (10) is supported on the saddle (4), it may be movably supported on the saddle (4).

また、上記実施例では、ラム(6)°がX軸方向へ、サ
ドル(4)がY軸方向へ移動するように構成されている
が、このX軸およびY軸の移動方向を逆にして構成する
ことも可能である。
Further, in the above embodiment, the ram (6)° is configured to move in the X-axis direction and the saddle (4) moves in the Y-axis direction, but the moving directions of the X-axis and Y-axis may be reversed. It is also possible to configure

さらに、上記実施例では、1本のネジ軸(13)上に送
りネジ部(13a)と逆ネジ部(13b)とを設けると
共に、ネジ軸(13)を1個の駆動用モータ(16)に
より回転駆動するように構成されているが、送りネジ部
と逆ネジ部とを各別に有する2本のネジ軸を設け、それ
らのネジ軸を1個の駆動用モータにより歯車機措等を介
して同期回転させるように構成したり、2本のネジ軸を
2個のモータにより同期回転させるように構成すること
も可能である。
Furthermore, in the above embodiment, the feed screw portion (13a) and the reverse screw portion (13b) are provided on one screw shaft (13), and the screw shaft (13) is connected to one drive motor (16). However, two screw shafts each having a feed screw portion and a reverse screw portion are provided, and these screw shafts are driven by a single drive motor through a gear mechanism, etc. It is also possible to configure the screw shafts so that they rotate synchronously, or to rotate the two screw shafts synchronously using two motors.

[発明の効果コ 以上のように、この発明の放電加工装置は、被加工物を
支持するベッドにサドルを移動可能に支持し、ラムをサ
ドルの移動方向と直交する方向に移動可能に支持し、そ
のラムには前記被加工物と対向する電極を支持したヘッ
ドを装着し、バランサをラムの移動方向と反対方向に移
動可能に支持し、前記サドル上にはラムおよびバランサ
に螺合するネジ軸を回転可能に支持し、ネジ軸を回転さ
せてラムおよびバランサを反対方向へ同期移動させるた
めの駆動手段を設けたものである。したがって、駆動手
段によりネジ軸が回転されると、ラムとバランサがそれ
ぞれ反対方向に同期して移動し、左右のモーメントが等
価になり、ラムの移動に伴うモーメントの片寄りを是正
し、ラムおよびヘッドの傾きをなくして、高い位置決め
精度を得ることができる。
[Effects of the Invention] As described above, the electric discharge machining apparatus of the present invention movably supports the saddle on the bed that supports the workpiece, and supports the ram so as to be movable in the direction perpendicular to the direction of movement of the saddle. , a head supporting an electrode facing the workpiece is attached to the ram, a balancer is supported so as to be movable in a direction opposite to the moving direction of the ram, and a screw screwed onto the ram and the balancer is mounted on the saddle. A shaft is rotatably supported, and driving means is provided for rotating the screw shaft and moving the ram and balancer in opposite directions in synchronization. Therefore, when the screw shaft is rotated by the driving means, the ram and balancer move in opposite directions in synchronization, the moments on the left and right become equal, the deviation of the moment due to the movement of the ram is corrected, and the ram and balancer High positioning accuracy can be achieved by eliminating head inclination.

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

第1図はこの発明の一実施例による放電加工装置の正面
図、第2図はその側面図、第3図は従来の放電加工装置
の正面図、第4図は従来の放電加工装置のラムがX方向
に所定量移動された状態を示す正面図である。 図において、 1:ベッド       4:サドル 6:ラム       8:ヘッド 10:バランサ     13:ネジ袖13a:送りネ
ジ部   13b:逆ネジ部16:駆動用モータ である。 なお、図中、同−符号及び同一記号は、同一または相当
部分を示す。
FIG. 1 is a front view of an electric discharge machining apparatus according to an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a front view of a conventional electric discharge machining apparatus, and FIG. 4 is a ram of a conventional electric discharge machining apparatus. FIG. 3 is a front view showing a state in which has been moved by a predetermined amount in the X direction. In the figure, 1: bed 4: saddle 6: ram 8: head 10: balancer 13: screw sleeve 13a: feed screw portion 13b: reverse screw portion 16: drive motor. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】 被加工物を支持するベッド上の一方向へ移動可能に支持
されたサドルと、 前記サドルの移動方向と直交する方向へ移動可能に支持
されたラムと、 前記ラムに装着され前記被加工物と対向する電極を支持
したヘッドと、 前記ラムの移動方向と反対方向に移動可能に支持された
バランサと、 前記サドル上に回転可能に支持されラムおよびバランサ
に螺合するネジ軸と、 前記ネジ軸を回転させてラムおよびバランサを互いに反
対方向へ移動させるための駆動手段とを具備することを
特徴とする放電加工装置。
[Scope of Claims] A saddle supported movably in one direction on a bed that supports a workpiece, a ram supported movably in a direction perpendicular to the direction of movement of the saddle, and attached to the ram. a head supporting an electrode facing the workpiece; a balancer supported movably in a direction opposite to the moving direction of the ram; and a screw rotatably supported on the saddle and screwed into the ram and the balancer. An electric discharge machining apparatus comprising: a shaft; and a driving means for rotating the screw shaft to move a ram and a balancer in opposite directions.
JP30569588A 1988-12-02 1988-12-02 Electric discharging device Pending JPH02152740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30569588A JPH02152740A (en) 1988-12-02 1988-12-02 Electric discharging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30569588A JPH02152740A (en) 1988-12-02 1988-12-02 Electric discharging device

Publications (1)

Publication Number Publication Date
JPH02152740A true JPH02152740A (en) 1990-06-12

Family

ID=17948246

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30569588A Pending JPH02152740A (en) 1988-12-02 1988-12-02 Electric discharging device

Country Status (1)

Country Link
JP (1) JPH02152740A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08318432A (en) * 1995-05-19 1996-12-03 Mitsubishi Electric Corp Electrical discharge machine
JP2002001629A (en) * 2000-04-19 2002-01-08 Inks:Kk Rocking preventing device for machine body in machining center
WO2009069325A1 (en) * 2007-11-29 2009-06-04 Mitsubishi Heavy Industries, Ltd. Machine tool
JP2009178826A (en) * 2008-02-01 2009-08-13 Hiwin Mikrosystem Corp Triaxially displaceable surface plate
JP2011152590A (en) * 2010-01-26 2011-08-11 Sumitomo Heavy Ind Ltd Stage device
KR20130070002A (en) * 2011-12-19 2013-06-27 두산인프라코어 주식회사 Balancing weight device for machine
KR101348861B1 (en) * 2009-12-28 2014-01-07 미츠비시 쥬고교 가부시키가이샤 Deflection correction device for ram

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08318432A (en) * 1995-05-19 1996-12-03 Mitsubishi Electric Corp Electrical discharge machine
JP2002001629A (en) * 2000-04-19 2002-01-08 Inks:Kk Rocking preventing device for machine body in machining center
WO2009069325A1 (en) * 2007-11-29 2009-06-04 Mitsubishi Heavy Industries, Ltd. Machine tool
JP2009131924A (en) * 2007-11-29 2009-06-18 Mitsubishi Heavy Ind Ltd Machine tool
TWI418428B (en) * 2007-11-29 2013-12-11 Mitsubishi Heavy Ind Ltd Working machine
US8668414B2 (en) 2007-11-29 2014-03-11 Mitsubishi Heavy Industries, Ltd Machine tool
JP2009178826A (en) * 2008-02-01 2009-08-13 Hiwin Mikrosystem Corp Triaxially displaceable surface plate
KR101348861B1 (en) * 2009-12-28 2014-01-07 미츠비시 쥬고교 가부시키가이샤 Deflection correction device for ram
JP2011152590A (en) * 2010-01-26 2011-08-11 Sumitomo Heavy Ind Ltd Stage device
KR20130070002A (en) * 2011-12-19 2013-06-27 두산인프라코어 주식회사 Balancing weight device for machine

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