JPH0942406A - Driving device for moving body - Google Patents

Driving device for moving body

Info

Publication number
JPH0942406A
JPH0942406A JP20836095A JP20836095A JPH0942406A JP H0942406 A JPH0942406 A JP H0942406A JP 20836095 A JP20836095 A JP 20836095A JP 20836095 A JP20836095 A JP 20836095A JP H0942406 A JPH0942406 A JP H0942406A
Authority
JP
Japan
Prior art keywords
ball screw
servo motors
moving body
screw shaft
base
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
JP20836095A
Other languages
Japanese (ja)
Other versions
JP3369802B2 (en
Inventor
Masao Nakagawa
昌夫 中川
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.)
Okuma Corp
Original Assignee
Okuma Machinery Works Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=16555010&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPH0942406(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Okuma Machinery Works Ltd filed Critical Okuma Machinery Works Ltd
Priority to JP20836095A priority Critical patent/JP3369802B2/en
Publication of JPH0942406A publication Critical patent/JPH0942406A/en
Application granted granted Critical
Publication of JP3369802B2 publication Critical patent/JP3369802B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To improve positioning accuracy of a table of a large machine tool or the like by preventing the twist of a small ball screw which is used on the table feed mechanism of the tool or the like and has a small ratio of its shaft diameter to its length. SOLUTION: In the feed mechanism of a table which is drivably along a guide 2 on a base 1, servo motors 10A, 10B are directly connected to both ends of a ball screw 7 supported to a bearing bracket 6 arranged on longitudinal direction both end parts of the base 1 through couplings 9A, 9B, each servo motor is synchronously controlled by a numerical control device 12, and the ball screw 7 is driven from the both sides. A load on the ball screw is born by two servo motors, a driving torque applied on both ends of the ball screw is reduced, and thereby, twist degree of the ball screw is reduced so as to improve positioning accuracy of the table 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は工作機械におけるテ
ーブル等移動体の駆動装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a movable body such as a table in a machine tool.

【0002】[0002]

【従来の技術】従来、工作機械におけるテーブル駆動機
構は、テーブルに固着されるボールねじナットと螺合す
るボールねじの一端にカップリング又はシンクロベルト
等の回転伝達部材を介してサーボモータを連結し、サー
ボモータの回転でテーブルを駆動する方法が一般に行わ
れている。
2. Description of the Related Art Conventionally, a table driving mechanism in a machine tool has a servo motor connected to one end of a ball screw screwed with a ball screw nut fixed to a table via a rotation transmitting member such as a coupling or a synchro belt. Generally, a method of driving a table by rotation of a servo motor is performed.

【0003】[0003]

【発明が解決しようとする課題】従来の技術で述べたテ
ーブル駆動機構は、大型の工作機械の場合には、長さに
対する軸径の比が小さいボールねじとなり、ねじりに対
する剛性が小さくなる。従って、テーブル駆動時の切削
抵抗,摺動抵抗,ボールナットの予圧による回転抵抗等
の負荷がボールねじにモーメント荷重として作用し、ボ
ールねじにねじりが発生して位置決め精度を悪くすると
いう問題を有している。
In the case of a large machine tool, the table drive mechanism described in the prior art is a ball screw having a small ratio of shaft diameter to length, and rigidity against torsion becomes small. Therefore, there is a problem that loads such as cutting resistance, sliding resistance, and rotational resistance due to preload of the ball nut act as moment load on the ball screw when the table is driven, and the ball screw is twisted to deteriorate the positioning accuracy. are doing.

【0004】本発明は従来の技術の有するこのような問
題点に鑑みなされたものであり、その目的とするところ
は、ボールねじを同期制御される2個のサーボモータに
より両側から駆動し、ボールねじに作用するモーメント
負荷を両側のサーボモータで分担して、ねじれによる位
置決め誤差を少なくし、位置決め精度を改善することの
できる移動体の駆動装置を提供しようとするものであ
る。
The present invention has been made in view of the above problems of the prior art. An object of the present invention is to drive a ball screw from both sides by two servo motors which are synchronously controlled, It is an object of the present invention to provide a drive device for a moving body in which the servomotors on both sides share the moment load acting on the screw to reduce the positioning error due to the twist and improve the positioning accuracy.

【0005】[0005]

【課題を解決するための手段】本発明の移動体の駆動装
置は、ベース上の案内に沿って移動可能に設けられた移
動体と、ベース上に前記案内と平行に設けられ両端部を
回転可能に支持されたねじ軸と、前記移動体に固着され
該ねじ軸に螺合されるナットと、前記ねじ軸の両端にそ
れぞれカップリング等の回転伝達部材を介して連結され
る2個のサーボモータと、該2個のサーボモータにそれ
ぞれ設けられた検出器と、前記2個のサーボモータを前
記検出器の出力信号が等しくなるように同期制御する手
段とを含んでなり、2個のサーボモータによりねじ軸を
両端から駆動するようにしたものである。
According to the present invention, there is provided a drive unit for a moving body, which is provided so as to be movable along a guide on a base, and which is provided on the base in parallel with the guide to rotate both ends. A screw shaft that is movably supported, a nut that is fixed to the moving body and screwed into the screw shaft, and two servos that are connected to both ends of the screw shaft through a rotation transmitting member such as a coupling. A motor, a detector provided in each of the two servo motors, and a means for synchronously controlling the two servo motors so that the output signals of the detectors become equal, the two servos A screw shaft is driven from both ends by a motor.

【0006】上述のように構成された移動体の駆動装置
によれば、移動体を移動する際にねじ軸にモーメント荷
重として作用する負荷がかかるが、ねじ軸の両側から2
個のサーボモータにより駆動トルクが付加されるので、
モーメント荷重を両側にて分担することになり、ねじれ
による位置決め精度の悪化を防止することができる。
According to the drive device for a moving body constructed as described above, a load acting as a moment load is applied to the screw shaft when the moving body is moved.
Since the driving torque is added by the individual servo motors,
Since the moment load is shared by both sides, it is possible to prevent the positioning accuracy from deteriorating due to twisting.

【0007】[0007]

【発明の実施の形態】以下本発明の実施の形態を図面に
もどつき説明する。図1はテーブル送り機構の正面図
で、図2は図1の側面図である。図1,図2において、
ベース1に二本で一組の案内2が押さえ板3により平行
に取着されており、案内2に移動可能に係合するスライ
ドブロック4がテーブル5の下面に固着されていて、テ
ーブル5は案内2に沿って移動可能とされている。ベー
ス1上には長手方向両端部に軸受ブラケット6がそれぞ
れ固着されており、案内の中央に設けられているボール
ねじ7の両端部がこの軸受ブラケット6により回転可能
に支持されている。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of the table feed mechanism, and FIG. 2 is a side view of FIG. 1 and 2,
A pair of two guides 2 are attached to the base 1 in parallel by a pressing plate 3, and a slide block 4 that is movably engaged with the guide 2 is fixed to the lower surface of the table 5. It is possible to move along the guide 2. Bearing brackets 6 are fixed to both ends in the longitudinal direction on the base 1, and both ends of a ball screw 7 provided at the center of the guide are rotatably supported by the bearing brackets 6.

【0008】ボールねじ7に螺合されるボールねじナッ
ト8はテーブル5の下面に固着されており、ボールねじ
の両端はカップリング9A,9Bを介して二個のサーボ
モータ10A,10Bの出力軸とそれぞれ直結されてい
る。サーボモータ10A,10Bにはそれぞれ検出器1
1A,11Bが同心に固着されており、二個のサーボモ
ータ10A,10Bは数値制御装置12により同期回転
される。数値制御装置12内には互いに対向する二個の
サーボモータ10A,10Bを同期制御して一本のボー
ルねじ7を駆動する図示しない同期制御駆動部が設けら
れており、同期制御駆動部は駆動時に各検出器11A,
11Bからフィードバックされる回転角度が等しくなる
ように二個のサーボモータ10A,10Bをプログラム
指令値にもとづいて駆動するものである。
A ball screw nut 8 screwed onto the ball screw 7 is fixed to the lower surface of the table 5, and both ends of the ball screw are output shafts of two servo motors 10A and 10B via couplings 9A and 9B. It is directly connected to each. Each of the servomotors 10A and 10B has a detector 1
1A and 11B are fixed concentrically, and the two servomotors 10A and 10B are synchronously rotated by the numerical controller 12. The numerical controller 12 is provided with a synchronous control drive unit (not shown) that synchronously controls two servo motors 10A and 10B facing each other to drive one ball screw 7, and the synchronous control drive unit drives the ball screw 7. Sometimes each detector 11A,
The two servomotors 10A and 10B are driven based on a program command value so that the rotation angles fed back from 11B become equal.

【0009】続いて本実施例の形態の作用を説明する。
例えば、テーブル5を図1で左方へ移動する場合、切削
抵抗,摺動抵抗等テーブル5の動きを阻止するように作
用する力に、ボールねじナットの予圧による回転抵抗等
が加わった負荷がボールねじ7に対してモーメント荷重
として作用する。仮に、右側のサーボモータ10A一個
だけの場合、このモーメント荷重によるボールねじ7の
ねじれはカップリング9Aとボールねじナット8との間
すなわちねじ軸の右側のみで発生する。しかし左側にも
サーボモータ10Bを有しているので、ボールねじ7の
左端にも同時に駆動トルクが作用し、カップリング9B
とボールねじナット8との間でもねじれが発生する。
Next, the operation of the embodiment will be described.
For example, when the table 5 is moved to the left in FIG. 1, a load such as a cutting resistance and a sliding resistance, which acts to prevent the movement of the table 5, is added with a rotational resistance due to the preload of the ball screw nut. It acts as a moment load on the ball screw 7. If there is only one servo motor 10A on the right side, the torsion of the ball screw 7 due to this moment load occurs between the coupling 9A and the ball screw nut 8, that is, only on the right side of the screw shaft. However, since the servo motor 10B is also provided on the left side, the driving torque acts on the left end of the ball screw 7 at the same time, and the coupling 9B
A twist also occurs between the ball screw nut 8 and the ball screw nut 8.

【0010】このようにテーブル移動中ボールねじの両
端に同時に駆動トルクが作用する場合、ボールねじにモ
ーメント荷重として作用する負荷を両側で分担すること
になり、ボールねじの両端に作用する駆動トルクは1/
2ずつとなり、見かけ上の長さと軸径との比も大きくな
るので、ボールねじ7に発生するねじれは微小であり、
テーブル5の位置決め精度に影響するほどのねじれは生
じないため、高精度の位置決めが可能となる。
When the driving torque acts on both ends of the ball screw at the same time during the movement of the table, the load acting on the ball screw as a moment load is shared by both sides, and the driving torque acting on both ends of the ball screw is 1 /
Since the ratio between the apparent length and the shaft diameter becomes large, the twist generated in the ball screw 7 is very small.
Since the twisting that affects the positioning accuracy of the table 5 does not occur, highly accurate positioning is possible.

【0011】なお、サーボモータ10A,10Bはカッ
プリング9A,9Bを介してボールねじ7に直結される
ものを限定されるものではなく、他の回転伝達部材すな
わちシンクロベルト又は歯車等を介してボールねじ7を
駆動するようにしてもよい。
The servo motors 10A, 10B are not limited to those directly connected to the ball screw 7 via the couplings 9A, 9B, but may be balls via other rotation transmitting members, such as a synchro belt or gears. The screw 7 may be driven.

【0012】[0012]

【発明の効果】本発明は上述のとおり構成されているの
で次に記載する効果を奏する。ねじ軸の両端を二個のサ
ーボモータにより駆動するようにして、移動体の移動中
ねじ軸にモーメント荷重として作用する負荷を両側の二
個のサーボモータによりそれぞれ分担するようにしたの
で、ねじ軸のねじれを抑制することが可能になり、位置
決め精度を向上することができる。
Since the present invention is configured as described above, it has the following effects. Since both ends of the screw shaft are driven by two servo motors, the load acting as a moment load on the screw shaft during movement of the moving body is shared by the two servo motors on both sides. It is possible to suppress the twist of the, and it is possible to improve the positioning accuracy.

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

【図1】本発明の実施の形態のテーブル送り機構の正面
図である。
FIG. 1 is a front view of a table feed mechanism according to an embodiment of the present invention.

【図2】同じくテーブル送り機構の側面の断面図であ
る。
FIG. 2 is a sectional view of a side surface of the table feeding mechanism.

【符号の説明】[Explanation of symbols]

1 ベース 2 案内 5 テーブル 6 軸受ブラケット 7 ボールねじ 8 ボールねじナット 9A,9B カップリング 10A,10B サーボモータ 11A,11B 検出器 12 数値制御装置 1 Base 2 Guide 5 Table 6 Bearing Bracket 7 Ball Screw 8 Ball Screw Nut 9A, 9B Coupling 10A, 10B Servo Motor 11A, 11B Detector 12 Numerical Control Device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ベース上の案内に沿って移動可能に設け
られた移動体と、ベース上に前記案内と平行に設けられ
両端部を回転可能に支持されたねじ軸と、前記移動体に
固着され該ねじ軸に螺合されるナットと、前記ねじ軸の
両端にそれぞれカップリング等の回転伝達部材を介して
連結される2個のサーボモータと、該2個のサーボモー
タにそれぞれ設けられた検出器と、前記2個のサーボモ
ータを前記検出器の出力信号が等しくなるように同期制
御する手段とを含んでなり、2個のサーボモータにより
ねじ軸を両端から駆動するようにしたことを特徴とする
移動体の駆動装置。
1. A moving body provided movably along a guide on a base, a screw shaft provided on the base in parallel with the guide and having both ends rotatably supported, and fixed to the moving body. Provided on the screw shaft, two nuts screwed to the screw shaft, two servo motors connected to both ends of the screw shaft via a rotation transmitting member such as a coupling, and the two servo motors, respectively. It includes a detector and means for synchronously controlling the two servo motors so that the output signals of the detectors become equal to each other. The two servo motors drive the screw shaft from both ends. A drive device for a moving body.
JP20836095A 1995-07-24 1995-07-24 Moving body drive device Ceased JP3369802B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20836095A JP3369802B2 (en) 1995-07-24 1995-07-24 Moving body drive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20836095A JP3369802B2 (en) 1995-07-24 1995-07-24 Moving body drive device

Publications (2)

Publication Number Publication Date
JPH0942406A true JPH0942406A (en) 1997-02-14
JP3369802B2 JP3369802B2 (en) 2003-01-20

Family

ID=16555010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20836095A Ceased JP3369802B2 (en) 1995-07-24 1995-07-24 Moving body drive device

Country Status (1)

Country Link
JP (1) JP3369802B2 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254075B1 (en) 1996-09-24 2001-07-03 Shinnippon Koki Kabushiki Kaisha (Shinnippon Koki Co., Ltd.) Table feed mechanism for machine tool
KR100440505B1 (en) * 2001-01-31 2004-07-19 도시바 기카이 가부시키가이샤 Method and apparatus for correcting positional deviation of finite linear rolling guide
US7183739B2 (en) * 2003-03-04 2007-02-27 Fanuc Ltd Synchronous control device
CN102941358A (en) * 2012-11-08 2013-02-27 无锡京华重工装备制造有限公司 Numerical control side tool carrier structure of vertical lathe
JP2013104470A (en) * 2011-11-11 2013-05-30 Fuji Mach Mfg Co Ltd Feed screw driving device and part mounting machine using the same
CN105880960A (en) * 2016-04-25 2016-08-24 苏州达恩克精密机械有限公司 Installing hook transposition device of automobile exhaust pipe assembly machine
CN107511432A (en) * 2017-09-20 2017-12-26 浙江默客机电有限公司 A kind of feed arrangement of mahjong table leg process equipment
CN108372489A (en) * 2018-04-26 2018-08-07 深圳市晶向科技有限公司 The support platform of glassware process equipment
IT201800005332A1 (en) * 2018-05-14 2019-11-14 PORTAL MILLING MACHINE
CN113118045A (en) * 2021-04-01 2021-07-16 上海应用技术大学 Short pipe detection device
CN116727700A (en) * 2023-07-07 2023-09-12 浙江诚创精密机械股份有限公司 Bearing ring machining lathe and machining method
CN116727700B (en) * 2023-07-07 2024-04-16 浙江诚创精密机械股份有限公司 Bearing ring machining lathe and machining method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254075B1 (en) 1996-09-24 2001-07-03 Shinnippon Koki Kabushiki Kaisha (Shinnippon Koki Co., Ltd.) Table feed mechanism for machine tool
KR100440505B1 (en) * 2001-01-31 2004-07-19 도시바 기카이 가부시키가이샤 Method and apparatus for correcting positional deviation of finite linear rolling guide
US7183739B2 (en) * 2003-03-04 2007-02-27 Fanuc Ltd Synchronous control device
JP2013104470A (en) * 2011-11-11 2013-05-30 Fuji Mach Mfg Co Ltd Feed screw driving device and part mounting machine using the same
CN102941358A (en) * 2012-11-08 2013-02-27 无锡京华重工装备制造有限公司 Numerical control side tool carrier structure of vertical lathe
CN105880960A (en) * 2016-04-25 2016-08-24 苏州达恩克精密机械有限公司 Installing hook transposition device of automobile exhaust pipe assembly machine
CN107511432A (en) * 2017-09-20 2017-12-26 浙江默客机电有限公司 A kind of feed arrangement of mahjong table leg process equipment
CN108372489A (en) * 2018-04-26 2018-08-07 深圳市晶向科技有限公司 The support platform of glassware process equipment
IT201800005332A1 (en) * 2018-05-14 2019-11-14 PORTAL MILLING MACHINE
WO2019220286A1 (en) * 2018-05-14 2019-11-21 Innse-Berardi S.P.A. Societa' Unipersonale Gantry milling machine
CN113118045A (en) * 2021-04-01 2021-07-16 上海应用技术大学 Short pipe detection device
CN116727700A (en) * 2023-07-07 2023-09-12 浙江诚创精密机械股份有限公司 Bearing ring machining lathe and machining method
CN116727700B (en) * 2023-07-07 2024-04-16 浙江诚创精密机械股份有限公司 Bearing ring machining lathe and machining method

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