EP1234657A1 - Presse à vis - Google Patents

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Publication number
EP1234657A1
EP1234657A1 EP00127117A EP00127117A EP1234657A1 EP 1234657 A1 EP1234657 A1 EP 1234657A1 EP 00127117 A EP00127117 A EP 00127117A EP 00127117 A EP00127117 A EP 00127117A EP 1234657 A1 EP1234657 A1 EP 1234657A1
Authority
EP
European Patent Office
Prior art keywords
ram
frame
determined
respect
speed
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.)
Withdrawn
Application number
EP00127117A
Other languages
German (de)
English (en)
Inventor
Takaki AIDA Engineering Minagawa
Yasuhiko AIDA Engineering Oyamada
Youichi AIDA Engineering Kubota
Kunihiro AIDA Engineering Suzuki
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.)
Aida Engineering Ltd
Original Assignee
Aida Engineering 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
Application filed by Aida Engineering Ltd filed Critical Aida Engineering Ltd
Publication of EP1234657A1 publication Critical patent/EP1234657A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
    • B30B1/186—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses

Definitions

  • the present invention relates to an apparatus for controlling movement in a machine tool, a method therefor, and in particular a screw press machine tool.
  • a screw press is a press machine which has a servo motor as the driving source and raises and lowers a ram (a slide) by a screw mechanism.
  • Patent Number 2533486 is an example of the prior art.
  • an electric motor is the drive source and a ram is raised and lowered via a screw mechanism.
  • the position and speed and the like of the ram are controlled using pulses from an encoder which is provided on the motor.
  • a screw shaft 7a is connected to the output shaft of a motor (servo motor) 2.
  • An end of screw shaft 7a is screwed into a nut 8a of a ram 8.
  • servo motor 2 rotates in the direction of arrow B
  • ram 8 is raised and lowered in the direction of arrow A due to the action of a screw mechanism 7.
  • ram 8 has a reciprocating motion due to the action of the screw mechanism.
  • the screw shaft is provided perpendicularly, ram 8 has a rise and fall motion.
  • An upper mold (not shown) is affixed to ram 8. Opposite this, a lower mold is affixed to a bolster. Material supplied between these upper and lower molds is pressed.
  • an encoder 3 is provided on servo motor 2. There is feed back of the pulse signals of encoder 3 to a position control circuit and a speed control circuit, and the position and speed of ram 8 are controlled.
  • the rotation amount of servo motor 2 is detected by encoder 3, the amount of raising or lowering of ram 8, or, in other words, the position of ram 8, can be controlled by the pulse number from encoder 3. Furthermore, the speed of ram 8 can be controlled by the pulse number per unit time of encoder 3.
  • processing of data such as inputting, establishing, changing, and the like of data such as the position, speed, and the like of the ram, is conducted by the information processing control circuit.
  • the position and speed of ram 8 can be controlled.
  • the above control system is called a semi-closed loop system. All of the control of the ram is conducted by the pulses of the encoder. There are no means for feedback of the actual movement conditions of the ram. As a result, in this prior art example, in order to have a high precision position control of the ram, there is direct coupling of the motor, which is the driving source, and the screw mechanism. There are no devices interposed between them. Such devices can obstruct the precision of the ram position because of deformation or loosening.
  • An aspect of the present invention has a construction in which a position detection sensor, which detects the position of the ram, is provided, and the position of the ram is controlled by the output from this sensor.
  • An aspect of the invention is directed to a screw press, in which a ram is driven by a servo motor via a screw mechanism, wherein: a position detection sensor, which detects the position of a ram, is interposed between either a frame or a bolster and the ram; output from the position detection sensor is used in positional control of the ram; the position in the vertical direction of the positional sensor is near the lower surface of the ram.
  • another aspect of the invention provides a screw press, wherein: with respect to the value of the bottom dead center which has been established beforehand, an allowable value in which the ram is considered to have reached the bottom dead center is provided, and the allowable value can be freely adjusted.
  • the screw press may be one wherein: in the vicinity of a plurality of points specifying ram positions which have been established beforehand, the variability for the control can be adjusted for each of the plurality of points by a timer.
  • the plurality of points established beforehand for each point except the bottom dead center, there are allowable values, with respect to positional data which have been established beforehand, in which the ram is considered to have reached each of the plurality of points, and the allowable values can be adjusted freely.
  • a servo motor 2 is affixed to a frame 1.
  • a pulley 4 is affixed to the output shaft of servo motor 2.
  • An encoder 3 is provided on a lower end of servo motor 2.
  • a screw mechanism is provided on frame 1.
  • a pulley 6 is affixed to the top end of the screw shaft.
  • a belt is placed over pulley 4 and pulley 6. The diameter of pulley 4 is smaller than the diameter of pulley 6.
  • the deceleration device is constructed from pulley 4, pulley 6, and belt 5.
  • Guide mechanism 10 comprises a cylindrical guide body affixed to a bed 1a, and a solid rod which is affixed to ram 8 and can be inserted into the above cylindrical guide body.
  • Guide mechanism 10 guides ram 8 in the up and down direction.
  • a bolster 9 is affixed to bed 1a.
  • a linear scale 11 is installed interposed between either frame 1 or bolster 9 and ram 8.
  • Linear scale 11 measures the vertical position of ram 8.
  • the positional control of ram 8 or in other words, the positional control in the vertical direction of ram 8 is conducted.
  • Linear scale 11 is installed in a location which is not easily affected by deformation of frame 1. In other words, by having the position in the height direction near the lower surface of ram 8, and making the distance from the upper surface of bed la very small, the deformation amount of frame 1 in between them is made small. As the distance from the upper surface of bed la to linear scale 11 increases, the deformation amount of frame 1 in between them grows larger, and the error in the output of linear scale 11 becomes large.
  • an upper die mold die is affixed to the lower surface of ram 8, and a lower mold die is affixed to the upper surface of bolster 9.
  • a die position sensor is provided, this position sensor being located interposed between one of the screw press frame 1 or bolster 9, and the ram 8. This is a high precision sensor which can accurately measure the distance between the upper and lower mold in the vicinity of the bottom dead center.
  • the material supplied between the upper mold and lower mold is press worked in conjunction with the rising and falling motion of ram 8 and becomes the product.
  • the information processing control circuit contains an in-position establishing circuit and timer establishing circuit, which are described later.
  • the molding patterns or in other words, the motion patterns for ram 8 needed for various press working, are indicated by (a) two position, (b) three position, (c) four position, (d) five position.
  • the vertical axis represents distance in the vertical direction
  • the horizontal axis is the time axis.
  • ram 8 is simply lowered and raised. Both are at constant speeds, and ram 8 simply goes back and forth between the top dead center and the bottom dead center.
  • the vertical distance from the top dead center to the bottom dead center is the stroke length.
  • the slope of the line segment represents the speed of ram 8.
  • One pattern is selected from among the patterns shown in Figs. 3(a)-(d) depending on the press working. Afterwards, the position and speed of each position is inputted and established.
  • the steps for establishing the position and speed of ram 8 when the five position, Fig.3(d), is selected is described.
  • the bottom dead center must be determined.
  • the fourth position is the bottom dead center.
  • the stroke length or in other words the vertical distance between the first position and the fourth position.
  • the location of each position, or in other words the height from the bottom dead center, is established.
  • the speed between each of the positions is established.
  • the motion pattern of ram 8 is established.
  • the above settings are conducted by keying in the values at sites on the control board determined for each item.
  • the position of ram 8 is controlled by matching the position data established in the above manner with the output from linear scale 11.
  • the speed of ram 8 is controlled by matching the speed data established in the above manner with the output from encoder 3.
  • servo motor 2 when the press machine is not operating, servo motor 2 is stopped, and ram 8 is stopped at the first position, which is the top dead center.
  • servo motor 2 has a positive rotation, and ram 8 descends at the established speed from the first position to the second position.
  • ram 8 When ram 8 reaches the second position, it descends towards the third position at the established speed.
  • ram 8 when ram 8 reaches the fourth position, which is the bottom dead center, servo motor 2 reverses rotation, and ram 8 rises towards the fifth position at the established speed. Similarly, ram 8, which has reached the fifth position, returns to the top dead center, and servo motor 2 stops, and ram 8 also stops. The above series of motions is repeated. When operating the press machine continuously, servo motor 2 switches to the positive rotation at the top dead center, ram 8 descends after reaching the top dead center, and the same motions as described above is repeated.
  • This in-position value is designed to be able to be established within a range of 1 micrometers to 1000 micrometers. As described previously, the in-position value is selected according to the allowable precision of the product to be handled. The in-position value can be corrected by measuring the dimensions of an actual product which has been press worked.
  • the locus of ram 8 does not pass directly over the second position, but passes along a curve in the vicinity of the second position. In other words, in the vicinity of the intersection between the straight line connecting the first position and second position and the straight line connecting the second position and the third position, the locus becomes a curve of a certain radius.
  • the above radius is not constant and can be established and changed according to the situation.
  • the position passage precision is determined by establishing or modifying the aforementioned variability using a timer establishing circuit shown in Fig. 2 for each position.
  • the stopping time is established by a timer, and the locus of ram 8 is controlled so that it has the desired position passage precision.
  • This established value can be amended based on press working conditions and the precision of the press worked product.
  • an in-position method as described previously can be used. In other words, for each position, an in-position value is established, and when the position of ram 8 is within the in-position value, it advances to the next step.
  • the above error is the difference between the value established beforehand and the actual value measured at the bottom dead center position.
  • the present invention uses a control system (full-closed loop system) in which the ram position is directly measured and its output is fed back to the position control device. As a result, it can conduct positional control of the ram with extremely high precision. In other words, the ram position can be controlled with high precision without any influence from the extension of the frame due to a load, the deformation of parts due to thermal changes, deformation and looseness between parts due to a load, which is transferred from the power of the servo motor, on the parts.
  • a control system full-closed loop system

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)
EP00127117A 1999-12-10 2000-12-12 Presse à vis Withdrawn EP1234657A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35090099A JP2001162400A (ja) 1999-12-10 1999-12-10 スクリュープレス

Publications (1)

Publication Number Publication Date
EP1234657A1 true EP1234657A1 (fr) 2002-08-28

Family

ID=18413669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00127117A Withdrawn EP1234657A1 (fr) 1999-12-10 2000-12-12 Presse à vis

Country Status (3)

Country Link
EP (1) EP1234657A1 (fr)
JP (1) JP2001162400A (fr)
SG (1) SG90190A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121412A1 (fr) * 2008-04-03 2009-10-08 Martin Hagel Poinçonneuse à encoches
RU2555733C1 (ru) * 2014-03-20 2015-07-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный индустриальный университет" Винтовой пресс
CN105313365A (zh) * 2015-12-03 2016-02-10 安徽普伦智能装备有限公司 一种纵向挤压式压力机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5191162B2 (ja) * 2007-04-18 2013-04-24 ヤマハ発動機株式会社 プレス機
JP4958726B2 (ja) * 2007-10-23 2012-06-20 アイダエンジニアリング株式会社 プレス機械
JP5773223B2 (ja) * 2012-12-21 2015-09-02 村田機械株式会社 型締装置と型締方法
JP6605808B2 (ja) * 2015-01-26 2019-11-13 コマツ産機株式会社 プレス装置
JP6823910B2 (ja) * 2015-02-24 2021-02-03 蛇の目ミシン工業株式会社 サーボプレス、制御方法およびプログラム

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62296999A (ja) * 1986-04-04 1987-12-24 Janome Denki Kk 電動プレス
JPH079200A (ja) * 1993-06-25 1995-01-13 Ueno Seiki Kk サーボモータプレス装置の制御方法
JPH10272600A (ja) * 1997-03-28 1998-10-13 Aida Eng Ltd プレス機械のサーボ制御装置
JPH10277796A (ja) * 1997-04-07 1998-10-20 Kitagawa Elaborate Mach Co Ltd プレス制御方法及びプレス装置
JPH10277799A (ja) * 1997-03-31 1998-10-20 Komatsu Ltd サーボプレスのモーション制御装置とその制御方法
EP0943422A2 (fr) * 1998-03-16 1999-09-22 Yamada Dobby Co., Ltd. Dispositif de commande du coulisseau dans une presse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1480079A (en) * 1975-11-05 1977-07-20 Cincinnati Milacron Inc Presses
JP3818730B2 (ja) * 1997-03-31 2006-09-06 株式会社小松製作所 サーボプレスのモーション制御装置とその制御方法
JP2000280100A (ja) * 1999-03-31 2000-10-10 Aida Eng Ltd サーボプレス機械の下死点補正装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62296999A (ja) * 1986-04-04 1987-12-24 Janome Denki Kk 電動プレス
JPH079200A (ja) * 1993-06-25 1995-01-13 Ueno Seiki Kk サーボモータプレス装置の制御方法
JPH10272600A (ja) * 1997-03-28 1998-10-13 Aida Eng Ltd プレス機械のサーボ制御装置
JPH10277799A (ja) * 1997-03-31 1998-10-20 Komatsu Ltd サーボプレスのモーション制御装置とその制御方法
JPH10277796A (ja) * 1997-04-07 1998-10-20 Kitagawa Elaborate Mach Co Ltd プレス制御方法及びプレス装置
EP0943422A2 (fr) * 1998-03-16 1999-09-22 Yamada Dobby Co., Ltd. Dispositif de commande du coulisseau dans une presse

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 190 (M - 704) 3 June 1988 (1988-06-03) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121412A1 (fr) * 2008-04-03 2009-10-08 Martin Hagel Poinçonneuse à encoches
RU2555733C1 (ru) * 2014-03-20 2015-07-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный индустриальный университет" Винтовой пресс
CN105313365A (zh) * 2015-12-03 2016-02-10 安徽普伦智能装备有限公司 一种纵向挤压式压力机
CN105313365B (zh) * 2015-12-03 2018-01-23 安徽普伦智能装备有限公司 一种纵向挤压式压力机

Also Published As

Publication number Publication date
SG90190A1 (en) 2002-07-23
JP2001162400A (ja) 2001-06-19

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