WO2022269744A1 - Table à commande numérique avec mandrin - Google Patents

Table à commande numérique avec mandrin Download PDF

Info

Publication number
WO2022269744A1
WO2022269744A1 PCT/JP2021/023552 JP2021023552W WO2022269744A1 WO 2022269744 A1 WO2022269744 A1 WO 2022269744A1 JP 2021023552 W JP2021023552 W JP 2021023552W WO 2022269744 A1 WO2022269744 A1 WO 2022269744A1
Authority
WO
WIPO (PCT)
Prior art keywords
chuck
hydraulic cylinder
joint block
flow path
hydraulic
Prior art date
Application number
PCT/JP2021/023552
Other languages
English (en)
Japanese (ja)
Inventor
浅川和哉
井納繁幸
水谷大輔
Original Assignee
株式会社Fuji
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 株式会社Fuji filed Critical 株式会社Fuji
Priority to JP2023529266A priority Critical patent/JPWO2022269744A1/ja
Priority to PCT/JP2021/023552 priority patent/WO2022269744A1/fr
Publication of WO2022269744A1 publication Critical patent/WO2022269744A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck

Definitions

  • the present invention relates to an NC table with a chuck that enhances the workpiece gripping force.
  • Machine tools for drilling and milling are equipped with an NC table with a chuck that determines the phase of the workpiece gripped by the chuck.
  • the chuck-equipped NC table is configured to grip a workpiece using a hydraulic cylinder as a drive source.
  • Patent Literature 1 listed below discloses a headstock comprising a hydraulic chuck for an NC lathe.
  • a hydraulic chuck rotates at a predetermined number of revolutions based on a command value, and turning is performed on the workpiece gripped by the chuck claws.
  • the solenoid of the electromagnetic proportional control valve is driven based on the calculated value, and the operating pressure for the hydraulic cylinder is controlled in proportion to the spindle speed.
  • the operating pressure of the hydraulic cylinder is strengthened by the electromagnetic proportional control valve, so that the chuck claws securely hold the workpiece with a stable grasping force.
  • the hydraulic chuck of the conventional example has a configuration in which the gripping force is changed as necessary by an electromagnetic proportional control valve.
  • an electromagnetic proportional control valve is used, the gripping force is limited to the supply pressure of the hydraulic oil, so if a large gripping force is required for the hydraulic chuck, it is necessary to increase the diameter of the hydraulic cylinder. was there. These points are the same for the chuck-equipped NC table. Therefore, it becomes impossible to meet the demand for miniaturization.
  • An NC table with a chuck comprises a table body covering the entirety, a hydraulic cylinder rotatably incorporated in the center of the table body, and integrally formed with a plurality of coaxial pistons; A joint block that rotatably supports a hydraulic cylinder; A rotary joint configured in a rotating portion between the hydraulic cylinder and the joint block, which communicates the side passages with each other; and an operative chuck.
  • the NC table receives hydraulic pressure from a plurality of pistons, it is possible to secure a certain pressure-receiving area, and it is possible to generate a sufficient thrust force even though the hydraulic cylinder itself is downsized, and as a result, the workpiece can be moved by the chuck. Grip strength can be strengthened.
  • FIG. 2 is a cross-sectional view showing a part of the NC table in a state of gripping a workpiece; It is a cross-sectional view showing a part of the NC table in a state in which the work is released.
  • FIG. 3 is an enlarged cross-sectional view showing a hydraulic cylinder that constitutes the NC table;
  • FIG. 1 is a perspective view showing the internal structure of the machining center.
  • the machining center 1 is entirely covered with a machine body cover (not shown), and a machining chamber in which a workpiece is machined is provided at the front part of the machine body.
  • the longitudinal direction of the machine body is the Y-axis direction.
  • the width direction of the machine body is defined as the X-axis direction, and the vertical direction of the machine body is defined as the Z-axis direction.
  • the machining center 1 is assembled on a movable bed 11 and configured to be movable on the base 2 in the front-rear direction.
  • This machining center 1 constitutes a processing machine line in which a plurality of work machines such as other machine tools and inspection devices are arranged in the width direction.
  • the processing machine line is configured with various work machines modularized and with a suppressed width dimension.
  • the required number of bases 2 are arranged in the width direction (X-axis direction), and multiple work machines are arranged in close proximity. All of the various work machines of the processing machine line are assembled on the movable bed 11 and are movable along the rails 3 in the front-rear direction (Y-axis direction). Therefore, even if a plurality of work machines are arranged close to each other in the width direction of the machine body, it is possible for a worker to perform work such as tool exchange and maintenance inside the machine by pulling them out in the front-rear direction.
  • various work machines are also made compact, and the machining center 1 shown in the figure is also designed to be compact.
  • the machining center 1 is provided with a spindle head 12 that holds a tool at the front, and a spindle chuck 13 that allows attachment and detachment of a tool such as a drill or milling tool.
  • a spindle motor 14 is assembled on the upper part of the spindle head 12 to rotate the tool attached to the spindle chuck 13 .
  • the spindle head 12 and the like are mounted on the machining drive device 5 so as to be movable in three axial directions.
  • an X-axis slide 16 that moves in the width direction of the machine body is mounted on a Y-axis slide 15 that moves in the longitudinal direction of the machine body, and a Z-axis slide 17 that moves in the vertical direction of the machine body is mounted on the X-axis slide 16.
  • Movement of the Y-axis, X-axis, and Z-axis slides 15, 16, and 17 is configured such that the rotation output of the servomotor is converted into rectilinear motion by a ball screw mechanism.
  • NC table Below the spindle head 12 that is moved by the processing drive device 5, an NC table with a chuck (hereinafter simply referred to as "NC table") 18 that rotatably grips the workpiece is provided.
  • the NC table 18 of this embodiment is fixed so as to protrude forward from the frame 21 .
  • a pedestal 21 and a tool magazine 19 are vertically integrated and fixed on a movable bed 11, and a machining driving device 5 is superimposed thereon.
  • the tool magazine 19 stores a plurality of tools to be mounted on the spindle head 12 positioned in front, and an automatic tool changer is configured inside the opening/closing door.
  • the machining center 1 has a frame 21, a tool magazine 19, and a machining drive unit 5 stacked on top of each other in order to reduce the width dimension. It is assembled so that it overlaps the Further, a control device 6 for controlling the machining drive device 5, the spindle head 12, the NC table 18 and the like is mounted behind the machining drive device 5 and the like.
  • the NC table 18 of this machining center 1 is also required to be miniaturized. That is, the NC table 18 is required to have a configuration in which not only the dimension in the width direction but also the dimension in the height direction are suppressed.
  • FIG. 2 and 3 are cross-sectional views showing a part of the NC table 18 of this embodiment, in particular, FIG. 2 shows the state of gripping a work, and FIG. there is FIG. 4 is an enlarged sectional view showing hydraulic cylinders that constitute the NC table 18. As shown in FIG. 2 and 3 show only the main components related to the present invention.
  • the NC table 18 incorporates a rotatable hydraulic cylinder 28 in the center of a box-shaped table body 31 and is connected to the driving part of a chuck 32 attached to the top.
  • a joint block 33 that rotatably supports the hydraulic cylinder 28 is provided at the bottom of the table body 31 .
  • a rotating portion between the hydraulic cylinder 28 and the joint block 33 is configured with a rotary joint that enables the supply and discharge of hydraulic oil.
  • the joint block 33 has a clamping side channel 35 (see FIG. 2) for supplying hydraulic oil when gripping the workpiece in the chuck 32, and an unclamping side channel 36 (see FIG. 2) for supplying hydraulic oil when releasing the workpiece. (see FIG. 3) are formed. Note that FIGS. 2 and 3 show cross sections at different positions where each flow path is formed.
  • a clamp port 37 communicates with the clamp-side channel 35 via a connection channel 41 , and a pipe 43 is connected to the clamp port 37 .
  • an unclamping port 38 communicates with the unclamping side channel 36 via a connecting channel 42 , and a pipe 44 is connected to the unclamping port 38 .
  • the pipes 43 and 44 are connected to a hydraulic circuit for switching between the hydraulic pump and the tank via a switching valve.
  • the inner peripheral surface of the joint block 33 is formed with openings 351 and 361 of the clamping side flow path 35 and the unclamping side flow path 36, and annular grooves 75 and 76 superimposed on the positions of the openings 351 and 361. It is
  • the clamping side supply channel 45 formed in the hydraulic cylinder 28 rotates along the annular groove 75 to which the opening 451 corresponds, and the unclamping side supply channel 46 rotates along the annular groove 76 to which the opening 461 corresponds.
  • a rotary joint is configured to rotate along the Note that the clamp-side supply channel 45 is discontinuous because the anti-rotation pin 77 fixed to the first piston 55 is shown in the drawing.
  • the hydraulic cylinder 28 has an outer cylinder tube formed by combining three blocks. That is, the cylinder tube is integrated by assembling the first tube block 51, the second tube block 52 and the third tube block 53 in the vertical axis direction. A first piston 55 is inserted in the space between the first tube block 51 and the second tube block 52, and a second piston 56 is inserted in the space between the second tube block 52 and the third tube block 53. ing.
  • the upper pressure chambers 71 and 73 of the first piston 55 and the second piston 56 are communicated with the clamp side supply passage 45, and the opposite lower pressure chambers 72 and 74 are supplied with the unclamp side pressure.
  • the flow path 46 is in communication.
  • the first piston 55 and the second piston 56 which are coaxially arranged and have the same diameter, are integrated by connecting the central piston rod.
  • a chuck 32 is connected upward to the piston rod on the second piston 56 side.
  • the chuck 32 is not shown in detail in the drawings so as to specify the structure, but its driving part is connected to the piston rod of the second piston via a bolt 63, and the vertical movement of the bolt 63 causes the plurality of chuck claws 62 to move. Gripping and release of the work can be switched.
  • a detection rod 58 is connected to the piston rod on the first piston 55 side, and a detection plate 59 is fixed to the lower end projecting downward from the joint block 33 .
  • a non-contact sensor 61 for detecting the detection plate 59 is provided under the joint block 33 so that the chuck 32 can determine whether the workpiece is held or released.
  • a servomotor 65 is installed inside the table body 31 at a position indicated by a two-dot chain line, and its output is transmitted to the hydraulic cylinder 28 integrated with the chuck 32 via a rotation transmission mechanism.
  • a work is conveyed to the machining center 1 by an autoloader provided in the processing machine line and delivered to the NC table 18 .
  • port switching control is performed on the switching valves of the hydraulic circuit connected to the pipes 43 and 44, hydraulic oil is supplied to the hydraulic cylinders 28 of the NC table 18, and the chuck 32 grips the workpiece.
  • a hydraulic pump is connected to the pipe 43 shown in FIG. 2, and hydraulic oil is supplied from the clamp port 37 to the rotary joint via the connection flow path 41 and the clamp-side flow path 35. Further, hydraulic fluid is supplied to the clamp-side supply passage 45 of the hydraulic cylinder 28, and the first and second pistons 55, 56 are pushed downward by the hydraulic pressure in the upper pressure chambers 71, 73.
  • a tank is connected to the pipe 44 . Therefore, when the first and second pistons 55 and 56 are displaced downward, hydraulic fluid is pushed out from the lower pressure chambers 72 and 74 and discharged from the unclamping port 38 through the unclamping supply passage 46. and is further sent from the pipe 44 to the tank side.
  • the bolt 63 is pulled by the downward displacement of the first and second pistons 55 and 56 , and the workpiece set on the chuck 32 is gripped by the chuck claws 62 .
  • the work on the NC table 18 is phased by giving rotation of a predetermined angle to the hydraulic cylinder 28 by drive control of the servomotor 65 .
  • the spindle head 12 is moved by drive control of the machining driving device 5, and a predetermined machining such as drilling is performed on the workpiece on the NC table 18 by a drill attached to the spindle chuck 13.
  • the work is carried out from the machining center 1 by the autoloader, but at that time, the work held by the NC table is released. Specifically, port switching control is performed on the switching valve of the hydraulic circuit, and the pipe 44 shown in FIG. 3 is connected to the hydraulic pump, and conversely, the pipe 43 shown in FIG. 2 is connected to the tank. Hydraulic oil supplied from the hydraulic pump is sent from the unclamping port 38 to the rotary joint via the connection flow path 42 and the clamp-side flow path 36 .
  • Hydraulic oil flows into the unclamping side supply passage 46 of the hydraulic cylinder 28, the first and second pistons 55, 56 are displaced upward by hydraulic pressure received from the lower pressure chambers 72, 74, and the chuck of the chuck 32 is displaced upward.
  • the claws 62 are opened to release the work.
  • the hydraulic fluid is pushed out from the upper pressurizing chambers 71 and 73, passes through the clamp-side supply passage 45 and is discharged from the clamp port 37, and further It is sent from the pipe 43 to the tank side.
  • the NC table 18 of the present embodiment is configured by integrally forming a first piston 55 and a second piston 56 on the same axis, and a hydraulic cylinder 28 having a large pressure receiving area due to simultaneously supplied hydraulic oil. Therefore, it is possible to generate the required thrust force while making the hydraulic cylinder 28 itself smaller, and to strengthen the gripping force of the chuck 32 on the workpiece. In addition, by suppressing the radial dimension of the hydraulic cylinder 28, a space for assembling the servomotor 65 and the rotation transmission mechanism can be secured in the table body 31. As shown in FIG.
  • the NC table 18 directly rotatably supports the hydraulic cylinder 28 by the joint block 33 , and a rotary joint is formed between the cylinder tube (first tube block 51 ) of the hydraulic cylinder 28 and the joint block 33 . Therefore, the NC table 18 achieves miniaturization by reducing the number of parts. Even though the NC table 18 has a limited installation space as described above, it is possible to strengthen the gripping force of the workpiece even though it is small, contributing to the miniaturization and performance improvement of the machining center 1. .
  • the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.
  • the NC table with chuck attached to the machining center was described in the above embodiment, it may be attached to other machine tools.
  • the mounting direction of the chuck-equipped NC table is not limited to the vertical direction of the rotation axis of the chuck, but may be the longitudinal direction of the machine body.
  • the NC table in which two pistons are connected is shown in the above embodiment, three or more pistons may be connected if an assembly space can be secured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)

Abstract

L'invention concerne une table à commande numérique avec mandrin ayant une force de préhension de pièce améliorée, la table à commande numérique avec mandrin comprenant : un corps de table qui recouvre l'ensemble du corps ; un vérin hydraulique qui est incorporé de manière rotative au centre du corps de table et formé d'un seul tenant avec une pluralité de pistons coaxiaux ; un bloc d'articulation qui supporte de manière rotative le vérin hydraulique ; une articulation rotative configurée dans une partie rotative entre le vérin hydraulique et le bloc d'articulation, l'articulation rotative formant un trajet d'écoulement côté serrage et un trajet d'écoulement côté desserrage formés dans le bloc d'articulation communiquant respectivement avec le trajet d'écoulement d'alimentation côté serrage et le trajet d'écoulement d'alimentation côté desserrage formé dans le tube cylindrique du vérin hydraulique ; et un mandrin qui est assemblé au vérin hydraulique et qui comporte des griffes de mandrin qui fonctionnent par l'intermédiaire d'une unité d'entraînement qui est reliée à la tige de piston.
PCT/JP2021/023552 2021-06-22 2021-06-22 Table à commande numérique avec mandrin WO2022269744A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023529266A JPWO2022269744A1 (fr) 2021-06-22 2021-06-22
PCT/JP2021/023552 WO2022269744A1 (fr) 2021-06-22 2021-06-22 Table à commande numérique avec mandrin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/023552 WO2022269744A1 (fr) 2021-06-22 2021-06-22 Table à commande numérique avec mandrin

Publications (1)

Publication Number Publication Date
WO2022269744A1 true WO2022269744A1 (fr) 2022-12-29

Family

ID=84545293

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/023552 WO2022269744A1 (fr) 2021-06-22 2021-06-22 Table à commande numérique avec mandrin

Country Status (2)

Country Link
JP (1) JPWO2022269744A1 (fr)
WO (1) WO2022269744A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013169639A (ja) * 2012-02-23 2013-09-02 Minoru Kanematsu シリンダ付ホルダ及び把捉機構付ホルダ
JP2021008019A (ja) * 2019-07-03 2021-01-28 株式会社ジェイテクト 工作物把持装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013169639A (ja) * 2012-02-23 2013-09-02 Minoru Kanematsu シリンダ付ホルダ及び把捉機構付ホルダ
JP2021008019A (ja) * 2019-07-03 2021-01-28 株式会社ジェイテクト 工作物把持装置

Also Published As

Publication number Publication date
JPWO2022269744A1 (fr) 2022-12-29

Similar Documents

Publication Publication Date Title
US5214829A (en) Carriage structure of NC lathe
US4087890A (en) Compound lathe
WO2021085607A1 (fr) Dispositif de serrage d'outil et machine-outil
JP2010234479A (ja) 縦型タレット旋盤
KR102427733B1 (ko) 공작기계의 터렛 공구대
US6688452B2 (en) Driver and automatic pallet changer having the same
US6629355B2 (en) Machining method and machining system
WO2022269744A1 (fr) Table à commande numérique avec mandrin
US4011777A (en) Multi spindle lathes
JP7485525B2 (ja) 工作機械
JP4140687B2 (ja) クランクピン旋盤
WO2021084885A1 (fr) Support d'outil de coupe et machine-outil
JP5808226B2 (ja) 工作機械のワークの機内搬送装置
WO2015145577A1 (fr) Appareil de serrage hydraulique ayant une fonction de rotation
JP7279269B2 (ja) 主軸とホルダの組み合わせ、ホルダ及び工作機械
WO2022059118A1 (fr) Tourelle porte-outils
US7500419B2 (en) Center drive machine and clamping device therefore
JPH0790405B2 (ja) 深穴加工方法
KR102520194B1 (ko) 자동 공구 교환 장치
JP7309245B1 (ja) 主軸装置及び主軸装置を搭載した工作機械
WO2023032063A1 (fr) Table circulaire cn
JPH10286732A (ja) ターニングセンタ
US20110214267A1 (en) Tool device and machine tool
JP2024099933A (ja) 主軸装置及び主軸装置を搭載した工作機械
JP2003311513A (ja) 工作機械の刃物台

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21947031

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023529266

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21947031

Country of ref document: EP

Kind code of ref document: A1