WO2018226071A1 - Appareil pour mesurer le déplacement d'un cylindre de transfert de contre-poupée, et machine-outil comprenant celui-ci - Google Patents

Appareil pour mesurer le déplacement d'un cylindre de transfert de contre-poupée, et machine-outil comprenant celui-ci Download PDF

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Publication number
WO2018226071A1
WO2018226071A1 PCT/KR2018/006549 KR2018006549W WO2018226071A1 WO 2018226071 A1 WO2018226071 A1 WO 2018226071A1 KR 2018006549 W KR2018006549 W KR 2018006549W WO 2018226071 A1 WO2018226071 A1 WO 2018226071A1
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WO
WIPO (PCT)
Prior art keywords
piston
pulse signal
magnetostriction
cylinder
machine tool
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Application number
PCT/KR2018/006549
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English (en)
Korean (ko)
Inventor
황용헌
구상모
Original Assignee
두산공작기계 주식회사
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Publication of WO2018226071A1 publication Critical patent/WO2018226071A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B23/00—Tailstocks; Centres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, 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
    • B23Q2717/00—Arrangements for indicating or measuring
    • B23Q2717/003—Arrangements for indicating or measuring in lathes

Definitions

  • the present invention relates to an apparatus for measuring displacement of a cylinder for conveying a tail stock and a machine tool having the same. More particularly, the present invention relates to an NC lathe or turning center capable of automatically controlling the position of the tailstock by controlling the position.
  • NC lathes or turning centers may include tailstocks that support the ends of workpieces in order to prevent sagging of relatively long workpieces.
  • These tailstocks can be varied in position to support various workpieces, and there are manual and auto-type tailstocks for the movement of the tailstocks.
  • An object of the present invention is to provide a displacement measuring device of the tailstock conveying cylinder that enables the position control of the tailstock at low cost.
  • Another object of the present invention is to provide a machine tool including the displacement measuring apparatus described above.
  • Displacement measuring device of the tailstock conveying cylinder according to an exemplary embodiment for achieving the object of the present invention, a magnetostrictive shaft having a magnetostriction line extending to pass through the through hole of the piston in the cylinder bore, the piston A position magnet portion installed to surround the magnetostriction and having a permanent magnet movable together with the piston, and applying a first pulse signal to the magnetostriction and applying the first pulse signal and the permanent magnet to the magnetostriction. It includes a position measuring unit for receiving the second pulse signal generated by the intersection of the first and second magnetic fields are formed to calculate the position of the piston.
  • the position measuring unit includes a pulse wave generator for applying a current pulse to the magnetostriction as the first pulse signal, and a reflected wave for receiving an electrical signal as the second pulse signal from the magnetostriction. It may include a receiver.
  • the pulse wave generator and the reflected wave receiver of the position measuring unit may be fixedly installed in the head side chamber in the cylinder bore.
  • the cylinder may further include a piston rod extending from the piston in the rod side chamber.
  • the piston rod may have a cavity in communication with the through hole of the piston and extending to receive the magnetostrictive shaft.
  • the position measuring unit may further include a controller configured to calculate a moving distance of the piston by comparing the first pulse signal with the second pulse signal.
  • the first magnetic field is generated in the circumferential direction of the magnetostrictive shaft by the first pulse signal and the second magnetic field is formed in the axial direction of the magnetostrictive shaft by the permanent magnet.
  • the first pulse signal is generated in the circumferential direction of the magnetostrictive shaft by the first pulse signal and the second magnetic field is formed in the axial direction of the magnetostrictive shaft by the permanent magnet.
  • Machine tool for achieving the another object of the present invention is a bed, a guide rail extending in a first direction on the upper surface of the bed, the tailstock installed to be movable along the guide rail, the tailstock
  • a magnetostriction shaft having a transport cylinder for transporting the piston on the guide rail, and a magnetostriction shaft extending to pass through the through hole of the piston in the cylinder bore of the transport cylinder, and installed to surround the magnetostriction line on the piston.
  • a position magnet section having a permanent magnet movable together with the first magnet signal, and a first pulse signal applied to the magnetostriction line and intersecting first and second magnetic fields formed in the magnetostriction line by the first pulse signal and the permanent magnet.
  • a position measuring unit configured to receive the generated second pulse signal and calculate the position of the piston.
  • a displacement measuring device configured to receive the generated second pulse signal and calculate the position of the piston.
  • the transfer cylinder may be connected to one end of the tail stock and disposed in parallel with a moving direction of the tail stock.
  • the machine tool may further include a chuck disposed on the upper surface of the bed to face the tail stock and clamping one end of the workpiece.
  • the position measuring unit includes a pulse wave generator for applying a current pulse to the magnetostriction as the first pulse signal, and a reflected wave for receiving an electrical signal as the second pulse signal from the magnetostriction. It may include a receiver.
  • the pulse wave generator and the reflected wave receiver of the position measuring unit may be fixedly installed in the head side chamber in the cylinder bore.
  • the cylinder may further include a piston rod extending from the piston in the rod side chamber and penetrating the second end of the transfer cylinder.
  • the piston rod may have a cavity in communication with the through hole of the piston and extending to receive the magnetostrictive shaft.
  • the position measuring unit may further include a controller configured to calculate a moving distance of the piston by comparing the first pulse signal with the second pulse signal.
  • the apparatus for measuring displacement of a tailstock conveying cylinder may include a bar-shaped magnetostriction disposed in the conveying cylinder and a permanent magnet disposed on a piston moving along the magnetostrictive line.
  • FIG. 1 is a perspective view illustrating a machine tool in accordance with example embodiments.
  • FIG. 2 is a perspective view illustrating a tail stock device of the machine tool of FIG. 1.
  • FIG. 3 is a perspective view illustrating a tailstock feed cylinder of the machine tool of FIG. 1.
  • FIG. 4 is an exploded perspective view showing a displacement measuring device installed in the tail stock conveying cylinder of FIG.
  • FIG. 5 is a cross-sectional view illustrating a displacement measuring device in the tail stock conveying cylinder of FIG. 4.
  • FIG. 6 is a cross-sectional view illustrating a state in which the piston rod of the tailstock feed cylinder of FIG. 5 is moved forward.
  • FIG. 7 is a block diagram illustrating a displacement measuring device of a tailstock feed cylinder of the machine tool of FIG. 1.
  • FIG. 8 is a flowchart illustrating a method of controlling a machine tool according to example embodiments.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • FIG. 1 is a perspective view illustrating a machine tool in accordance with example embodiments.
  • FIG. 2 is a perspective view illustrating a tail stock device of the machine tool of FIG. 1.
  • FIG. 3 is a perspective view illustrating a tailstock feed cylinder of the machine tool of FIG. 1.
  • 4 is an exploded perspective view showing a displacement measuring device installed in the tail stock conveying cylinder of FIG.
  • FIG. 5 is a cross-sectional view illustrating a displacement measuring device in the tail stock conveying cylinder of FIG. 4.
  • FIG. 6 is a cross-sectional view illustrating a state in which the piston rod of the tailstock feed cylinder of FIG. 5 is moved forward.
  • 7 is a block diagram illustrating a displacement measuring device of a tailstock feed cylinder of the machine tool of FIG. 1.
  • the machine tool 10 includes a headstock 30 for clamping a workpiece on a bed 20, and a tool post for transferring a tool on the bed 20 to process the workpiece.
  • a device (not shown), arranged to face the headstock 30 and for conveying the tailstock 100 for supporting the work piece, the tailstock 100 along the guide rail 40 on the bed 20.
  • the transfer cylinder 200 and the displacement measuring device 300 of the transfer cylinder 200 for measuring the position of the tail stock 100 is moved by the transfer cylinder 200.
  • the machine tool 10 may be a horizontal NC lathe or turning center.
  • the Z direction (first direction) is the longitudinal direction of the bed 20
  • the X direction (second direction) is orthogonal to the Z direction and is a direction for transferring the tool toward the workpiece
  • the Y direction (third direction) ) May be a direction orthogonal to the Z direction and the X direction.
  • Bed 20 may have an upper surface inclined with respect to the horizontal plane for smooth discharge of the chip issued during processing.
  • the upper surface may have an angle of inclination with respect to the horizontal surface. Therefore, the X direction may also have an angle of inclination with respect to the horizontal plane.
  • the tool rest device may be installed to slide in the Z direction on the upper surface of the bed (20).
  • Spindle 30 may include a chuck for clamping one end of the workpiece. As the chuck is rotated by the main shaft, the fixed workpiece can be rotated.
  • the tail stock 100 may be installed to be movable along the guide rail 40 installed on the upper surface of the bed 20.
  • the guide rail 40 may include an LM guide.
  • the guide rail 40 may extend in the first direction (Z direction).
  • the guide rail may be provided in plural, and the plurality of guide rails may be spaced apart from each other in a second direction (X direction) perpendicular to the first direction.
  • X direction perpendicular to the first direction.
  • two guide rails 40 may be spaced apart from each other.
  • the tailstock 100 can linearly move the guide rail 40 by a transfer cylinder 200, which will be described later, and presses the rotation axis of the free end of the workpiece fixed by the chuck to fix and rotate the workpiece. It can keep the concentric axis.
  • the transfer cylinder 200 includes a piston 220 operatively connected to one end of the tailstock 100 and guides the tailstock 100 by forward and backward movement of the piston 220. It is possible to slide on 40.
  • the transfer cylinder 200 may be disposed in parallel with a direction in which the cylinder bore 202 extends in the direction of movement (Z direction) of the tail stock 100.
  • the transfer cylinder 200 may comprise a hydraulic cylinder or a pneumatic cylinder.
  • the forward and backward movement of the transfer cylinder 200 may be controlled by the controller 350 to be described later.
  • the displacement measuring apparatus 300 of the transfer cylinder 200 may control the position of the tail stock 100 by measuring the displacement of the transfer cylinder 200.
  • the displacement measuring device 300 is a magnetostriction 320 installed to pass through the through hole 222 of the piston 220 in the cylinder bore 202 of the transfer cylinder 200.
  • a magnetostriction shaft having a magnetostriction shaft, a position magnet unit installed to surround the magnetostriction wire 320 on the piston 220 and having a permanent magnet 330 movable together with the piston 220, and a first magnet to the magnetostriction wire 320. It may include a position measuring unit for applying a pulse signal and receiving the second pulse signal reflected from the permanent magnet 330 to detect the position of the piston 220.
  • the position measuring unit includes a pulse wave generator 310 for applying a current pulse as the first pulse signal to the magnetostriction 320, and a reflected wave receiver for receiving an electrical signal as the second pulse signal from the magnetostriction 320. 340, and a controller 350 comparing the first pulse signal with the second pulse signal to calculate a moving distance of the piston 220.
  • the transfer cylinder 200 may include a piston 220 installed to be movable within the cylinder bore 202.
  • the cylinder bore 202 may comprise a first chamber, ie a head side chamber C1 and a second chamber, ie a rod side chamber C2, separated by a piston 220.
  • An end cap 210 is fixedly installed at the first end of the cylinder bore 202 to constitute the first end of the transfer cylinder 200, and the first chamber C1 is located between the piston 220 and the end cap 210.
  • the end cap 210 has a head 212 fixedly installed at a second end opposite to the first end of the cylinder bore 202 to constitute a second end opposite to the first end of the transfer cylinder 200.
  • the second chamber C2 may be defined between the piston 220 and the head 212.
  • the transfer cylinder 200 may include a piston rod 230 extending from the piston 220 in the second chamber C2 and penetrating the second end of the transfer cylinder 200, ie, the head 212. have.
  • One end of the piston rod 230 may be connected to the piston 220, and the other end of the piston rod 230 may be connected to one end of the tail stock 100.
  • the cylinder bore 202 may be provided with a first port 204 communicating with the first chamber C1 and a second port 206 communicating with the second chamber C2.
  • first port 204 communicating with the first chamber C1
  • second port 206 communicating with the second chamber C2.
  • the piston rod 230 moves as the piston 220 moves toward the head 212. Can move forward.
  • the piston rod 230 advances, the tail stock 100 may move to approach the workpiece clamped to the chuck.
  • hydraulic pressure (or pneumatic) is supplied into the second chamber C2 through the second port 206, the piston rod 230 may retreat as the piston 220 moves toward the end cap 212. .
  • the piston rod 230 retracts, the tail stock 100 can move away from the workpiece clamped to the chuck.
  • the pulse wave generator 310 and the reflected wave receiver 340 of the transfer cylinder 200 are fixedly installed in the first chamber C1 in the cylinder bore 202 as one transmit / receive module M.
  • the transmission / reception module M may be installed to be adjacent to the end cap 210 in the cylinder bore 202.
  • the magnetostriction 320 may be fixedly installed at one end of the transmission / reception module M in the cylinder bore 202.
  • the magnetostriction 320 may extend from one end of the transmission / reception module M and may pass through the through hole 222 of the piston 220.
  • the piston 220 may be installed to be movable along the magnetostriction 320.
  • a sealing member may be provided on the outer surface of the piston 222 to fluid seal between the first and second chambers C1 and C2.
  • a sealing member may be further provided between the outer side surface of the magnetostriction line 320 and the through hole 222 of the piston 220 to be fluidically sealed.
  • the piston rod 230 may have a cavity 232 communicating with the through hole 222 of the piston 220 and extending to receive the magnetostriction 320.
  • the piston rod 230 may be installed to be movable along the magnetostriction 320.
  • the inner surface of the cavity 232 of the piston rod 230 may be installed to be spaced apart from the outer surface of the magnetostrictive line (320).
  • the controller 350 may calculate the moving distance of the piston by comparing the first pulse signal with the second pulse signal.
  • the controller 350 may generate a TTL signal from the frequency difference between the first pulse signal and the second pulse signal and transmit the TTL signal to the numerical control (NC) device.
  • the numerical controller may determine the current position of the tail stock 100 from the TTL signal and control the transfer cylinder 200.
  • the pulse wave generator 310 may receive a position measurement start signal from the controller 350 and apply a current pulse as the first pulse signal A to the magnetostriction line 320.
  • the current pulse generated by the pulse wave generator 310 may generate the first magnetic field B1 in the circumferential direction of the magnetostriction line 320.
  • the permanent magnet 330 moving along the magnetostriction 320 may generate a second magnetic field B2 in the axial direction in the magnetostriction 320. Accordingly, the first magnetic field in the circumferential direction generated by the magnetostriction line 320 and the second magnetic field in the axial direction generated by the permanent magnet 330 may cross each other to induce a synthetic magnetic field.
  • the synthesized magnetic field is propagated to the magnetostriction line 320 as the second pulse signal B, and the reflected wave receiver 340 is an electrical signal (current signal or as the second pulse signal propagated to the magnetostriction line 320). Voltage signal).
  • the controller 350 may calculate a distance between the transmission / reception module M and the permanent magnet 330 by measuring a difference between the first frequency of the first pulse signal and the second frequency of the second pulse signal. Since the position of the permanent magnet 330 is the position of the piston 220, the position of the tail stock 100 may be measured from the position of the piston 220.
  • the bar-shaped magnetostriction line 320 is installed inside the tailstock conveying cylinder 200, and the magnet is fixed by the permanent magnet 330 disposed on the piston 220 moving along the magnetostriction line 320.
  • the position of the permanent magnet 330 can be measured. Therefore, the position of the tail stock 100 can be measured from the position of the piston 220, and the cylinder 200 can be controlled.
  • a displacement measuring device 300 having a bar-shaped magnetostriction line 320 and a permanent magnet 330 moving along the magnetostriction line 320 is provided inside the transfer cylinder 200, it is structurally stable and It is possible to control the position of the tail stock 100 without a component such as an expensive encoder.
  • FIG. 8 is a flowchart illustrating a method of controlling a machine tool according to example embodiments.
  • one end of the workpiece is clamped to the main shaft 30, and the piston rod 230 of the transfer cylinder 200 is advanced to extend the tail stock 100. It may be transported to be closer to the workpiece (S100).
  • the headstock 30 of the machine tool 10 may include a chuck for clamping one end of the workpiece. As the chuck is rotated by the main shaft, the fixed workpiece can be rotated.
  • the tailstock 100 may linearly move the guide rail 40 by the transfer cylinder 200, pressurizes the rotation axis of the free end of the workpiece fixed by the chuck, thereby adjusting the concentric shaft at the time of fixing and rotating the workpiece. You can keep it.
  • the tailstock 100 may be transferred by supplying hydraulic pressure (or pneumatic) into the first chamber C1 through the first port 204 of the transfer cylinder 200 to advance the piston rod 230.
  • hydraulic pressure or pneumatic
  • the first pulse signal is applied to the magnetostriction line 320 installed in the transfer cylinder 200 (S110), and the magnetostriction line is formed by the permanent magnet 330 moved along the magnetostriction line 320 together with the piston 220.
  • a second pulse signal propagated to the controller 320 may be received.
  • the pulse wave generator 310 may receive a position measurement start signal from the controller 350 and apply a current pulse as the first pulse signal A to the magnetostriction line 320.
  • the current pulse generated by the pulse wave generator 310 may generate a first magnetic field in the circumferential direction of the magnetostriction line 320.
  • the permanent magnet 330 moving along the magnetostriction 320 may generate a second magnetic field in the magnetostriction 320 in the axial direction. Accordingly, the first magnetic field in the circumferential direction generated by the magnetostriction line 320 and the second magnetic field in the axial direction generated by the permanent magnet 330 may cross each other to induce a synthetic magnetic field.
  • the synthesized magnetic field is propagated to the magnetostriction line 320 as the second pulse signal B, and the reflected wave receiver 340 is an electrical signal (current signal or as the second pulse signal propagated to the magnetostriction line 320). Voltage signal).
  • the current position of the tail stock 100 may be calculated by comparing the first and second pulse signals (S130) and the transfer cylinder 200 may be controlled (S140).
  • the controller 350 may calculate the displacement of the permanent magnet 330 by measuring a difference between the first frequency of the first pulse signal and the second frequency of the second pulse signal. Since the position of the permanent magnet 330 is the position of the piston 220, the position of the tail stock 100 may be measured from the position of the piston 220.
  • the controller 350 may generate a TTL signal from the frequency difference between the first pulse signal and the second pulse signal and transmit the TTL signal to the numerical control (NC) device.
  • the numerical control device may determine the current position of the tail stock 100 from the TTL signal and control the transfer cylinder 200.
  • tailstock 200 transfer cylinder
  • pulse wave generator 320 magnetostrictive line
  • control unit M transmission and reception module

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)

Abstract

La présente invention concerne un appareil pour mesurer le déplacement d'un cylindre de transfert de contre-poupée qui comprend : un arbre de fil magnétostrictif comportant un fil magnétostrictif installé de façon à s'étendre à travers un trou traversant d'un piston à l'intérieur d'un alésage de cylindre; une unité d'aimant de position comportant un aimant permanent mobile conjointement avec le piston et installé sur le piston de façon à entourer le fil magnétostrictif; et une unité de mesure de position pour appliquer un premier signal d'impulsions au fil magnétostrictif, et recevoir un deuxième signal d'impulsions qui est généré par l'intersection de premier et deuxième champs magnétiques formés dans le fil magnétostrictif par le premier signal d'impulsion et l'aimant permanent, de façon à calculer la position du piston.
PCT/KR2018/006549 2017-06-08 2018-06-08 Appareil pour mesurer le déplacement d'un cylindre de transfert de contre-poupée, et machine-outil comprenant celui-ci WO2018226071A1 (fr)

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KR1020170071628A KR102272223B1 (ko) 2017-06-08 2017-06-08 심압대 이송용 실린더의 변위 측정 장치 및 이를 갖는 공작 기계
KR10-2017-0071628 2017-06-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113245572A (zh) * 2021-04-21 2021-08-13 首钢京唐钢铁联合有限责任公司 一种尾顶尖装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102411862B1 (ko) * 2021-02-24 2022-06-22 김정환 변위 측정 센서 구조체

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Publication number Priority date Publication date Assignee Title
JPH07332958A (ja) * 1994-06-02 1995-12-22 Yamamura Glass Co Ltd 位置検出装置
KR20060133460A (ko) * 2005-06-20 2006-12-26 에스엠시 가부시키가이샤 위치 검출 장치 부착 유압 실린더
KR20090059738A (ko) * 2007-12-07 2009-06-11 두산인프라코어 주식회사 공작기계 공구대 이송모터를 이용한 심압대 이송장치 및방법
KR20160076187A (ko) * 2014-12-22 2016-06-30 두산공작기계 주식회사 공작기계
JP2017015197A (ja) * 2015-07-02 2017-01-19 Ｋｙｂ株式会社 流体圧シリンダ及びその製造方法

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DE4334811A1 (de) * 1993-10-13 1995-04-20 Festo Kg Positionserfassungsvorrichtung an einem Linearantrieb

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH07332958A (ja) * 1994-06-02 1995-12-22 Yamamura Glass Co Ltd 位置検出装置
KR20060133460A (ko) * 2005-06-20 2006-12-26 에스엠시 가부시키가이샤 위치 검출 장치 부착 유압 실린더
KR20090059738A (ko) * 2007-12-07 2009-06-11 두산인프라코어 주식회사 공작기계 공구대 이송모터를 이용한 심압대 이송장치 및방법
KR20160076187A (ko) * 2014-12-22 2016-06-30 두산공작기계 주식회사 공작기계
JP2017015197A (ja) * 2015-07-02 2017-01-19 Ｋｙｂ株式会社 流体圧シリンダ及びその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113245572A (zh) * 2021-04-21 2021-08-13 首钢京唐钢铁联合有限责任公司 一种尾顶尖装置
CN113245572B (zh) * 2021-04-21 2022-10-04 首钢京唐钢铁联合有限责任公司 一种尾顶尖装置

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