WO2010090261A1 - Main shaft device of machine tool - Google Patents

Main shaft device of machine tool Download PDF

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Publication number
WO2010090261A1
WO2010090261A1 PCT/JP2010/051616 JP2010051616W WO2010090261A1 WO 2010090261 A1 WO2010090261 A1 WO 2010090261A1 JP 2010051616 W JP2010051616 W JP 2010051616W WO 2010090261 A1 WO2010090261 A1 WO 2010090261A1
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WO
WIPO (PCT)
Prior art keywords
tool
main shaft
shaft
guide member
draw bar
Prior art date
Application number
PCT/JP2010/051616
Other languages
French (fr)
Japanese (ja)
Inventor
宜孝 藤村
健一郎 平尾
Original Assignee
三菱重工業株式会社
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 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Publication of WO2010090261A1 publication Critical patent/WO2010090261A1/en

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    • 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
    • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B23B29/034—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings
    • B23B29/03432—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings radially adjustable during manufacturing
    • B23B29/03446—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings radially adjustable during manufacturing by means of inclined planes

Definitions

  • the present invention relates to a spindle device of a machine tool, and more particularly to a tool holder attaching / detaching structure in a spindle device of a machine tool having an automatic tool change function.
  • a guide cylinder fixed to the tip of the spindle and a sliding displacement can be made in the shaft hole of the guide cylinder.
  • a clamping unit including a lock rod attached to the machine is provided, and the tool is clamped and unclamped by advancement and retraction of the lock rod (for example, see Patent Document 1).
  • This is provided with an inner cylinder part into which a taper part which is a restraint part of the tool holder is fitted in the guide cylinder, and the spherical body penetrates the inner cylinder part of the guide cylinder and the taper part of the tool holder respectively in the radial direction.
  • a through hole to be fitted is formed, and the tool holder is clamped and unclamped by moving the sphere in the radial direction in accordance with the forward and backward movement of the lock rod.
  • the draw bar is inserted into a shaft hole formed on the axis of the main shaft, and moves forward and backward in the axial direction, and a sleeve provided at the tip of the draw bar and through which a tool pull stud is inserted.
  • the tool is clamped / unclamped according to the above (for example, see Patent Document 2).
  • a draw bar is inserted into an axial hole formed on the axis of the tool so as to be able to advance and retract, and the radial position of the cutting edge (tip) of the tool is determined according to the advance and retreat of the draw bar.
  • the cutting diameter of the tool is corrected by adjusting the position of the cutting edge of the tool in the radial direction according to the advancement and retraction of the draw bar.
  • a tool having an internal correction function such as a tool (see, for example, Patent Document 4) is known.
  • a tool having an internal correction function (hereinafter referred to as a special tool) that adjusts the position of the blade edge by the forward and backward movement of the draw bar as described above, for example, a general tool (hereinafter referred to as a normal tool) conforming to JIS-B6064, for example. It could not be applied to a spindle device of a machine tool having an automatic tool change function used for a tool). Therefore, in machining using a special tool having a conventional internal correction function, a special machine tool that does not have an automatic tool change function is used, or a special automatic tool that cannot be used with a general tool as described above. It was necessary to use a machine tool with a tool change function, and high precision machining, high reliability machining and versatility could not be achieved at the same time.
  • the present invention makes it possible to attach and detach a tool configured to change the position of the blade edge by moving the correction axis forward and backward by an automatic tool change function, and to use it together with a normal tool.
  • An object of the present invention is to provide a spindle device for a machine tool.
  • a spindle device of a machine tool for solving the above-mentioned problem, comprising a spindle having an automatic tool change function, rotatably supported by a housing and driven to rotate by a first drive means,
  • a spindle device including a spindle-side correction shaft that is inserted into a shaft hole formed on the axis of the spindle so as to be able to advance and retract and is advanced and retracted by a second driving means, and inserted into the shaft hole of the spindle.
  • a first restraining member configured to be slidable along the outer peripheral surface of the member, and one end locked to the tip of the main shaft side correction shaft and the other end slidable along the inner peripheral surface of the guide member
  • a second restraining member configured in accordance with the forward and backward movement of the guide member The other end of the first restraining member is enlarged or reduced in diameter along a convex portion formed on the outer peripheral surface of the guide member, thereby restraining / releasing the tool holder of the tool attached to the tip of the main shaft.
  • While the other end of the second restraining member is contracted / expanded along a concave portion formed on the inner peripheral surface of the guide member, thereby restraining the tool side correction shaft built in the tool.
  • -It is characterized by being configured to open.
  • a spindle device of a machine tool according to a second invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first invention, wherein the first restraining member is disposed at the other end of the guide member.
  • the first restraining member When the diameter is expanded by advancing and retreating, it has a locking portion that engages with the thick portion formed at the tip of the tool holder and locks the thick portion, and the second restraining member includes the other It is characterized by having a locking portion on the end side for engaging with the pull stud of the tool side correction shaft to lock the pull stud when the diameter is reduced by the forward and backward movement of the guide member.
  • a spindle device of a machine tool according to a third aspect of the present invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first or second aspect of the invention, wherein the third drive means moves the guide member forward. It is comprised from the press means to press, and the disk spring which urges
  • a spindle device of a machine tool according to a fourth aspect of the present invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first or second aspect of the invention, wherein the guide cylinder is the guide by the third drive means.
  • the shape of the convex part and the concave part is set so that the tool holder and the tool side correction shaft are restrained and released by the first restraining member and the second restraining member only by the advance and retreat of the member. It is characterized by that.
  • a spindle device of a machine tool according to a fifth aspect of the present invention for solving the above problem is a spindle device of a machine tool according to the fourth aspect of the invention, wherein the first restraining member is applied to a machine tool having an automatic tool change function. It is characterized in that it can be restrained / released with respect to the tool holder of a normal tool.
  • the spindle device of the machine tool having an automatic tool change function, rotatably supported by the housing and driven to rotate by the first drive means, and on the axis of the spindle
  • a spindle device including a spindle-side correction shaft that is inserted into the formed shaft hole so as to be able to advance and retract and is moved forward and backward by the second driving means
  • the spindle device is inserted into the shaft hole of the spindle and the spindle-side correction shaft is
  • a guide member that is inserted into the shaft hole formed on the axis and moves forward and backward by the third driving means, and one end is locked to the inner peripheral surface of the main shaft and the other end slides along the outer peripheral surface of the guide member
  • a first constraining member configured to be able to be configured, and a second constraining member configured to be slidable along the inner peripheral surface of the guide member with one end locked to the tip of the main shaft side correction shaft.
  • the other end of the first restraining member is formed on the outer peripheral surface of the guide member according to the advancement and retraction of the guide member
  • the tool holder of the tool mounted on the tip of the spindle is constrained / released by being expanded / reduced along the convex portion, while the other end of the second constraining member is the inner peripheral surface of the guide member
  • the tool side correction shaft built in the tool is constrained / released by reducing or expanding the diameter along the concave part formed in the tool.
  • a special tool that can change the position of the cutting edge by moving it back and forth can be attached and detached by the automatic tool change function. At this time, the guide shaft is moved forward and backward to restrain the correction shaft and tool holder. ⁇ Can be opened.
  • the first restraining member is formed at the other end and at the tip of the tool holder when the other end is expanded by the advancement and retraction of the guide member.
  • the second restraining member is engaged with the thick part and the thick part is engaged, and the second restraining member is moved to the other end side when the other end is reduced in diameter by advancing and retreating of the guide member. Since there is a locking portion that engages with the pull stud of the tool side correction shaft to lock the pull stud, the correction shaft and the tool holder can be reliably restrained and released.
  • the third drive means is constituted by a pressing means for pressing the guide member forward and a disc spring for biasing the guide member backward. Therefore, the guide tube can be smoothly advanced and retracted.
  • the guide tube is moved only by the forward and backward movement of the guide member by the third drive means, and the tool holder and the tool side by the first restraint member and the second restraint member. Since the shape of the convex part and the concave part is set so as to constrain and release the correction axis, the correction axis and the tool holder can be constrained or released at the same time only by advancing and retreating the guide member. Will improve.
  • the first restraining member is configured to be capable of restraining / releasing the tool holder of a normal tool applied to a machine tool having an automatic tool changing function. Therefore, the special tool and the normal tool can be applied to a common machine tool having an automatic tool change function, and both high accuracy, high reliability, high efficiency machining and versatility can be achieved.
  • FIG. 1 is an overall view of a spindle device of a machine tool according to an embodiment of the present invention.
  • 2A is a cross-sectional view of a main part of a spindle device of a machine tool according to an embodiment of the present invention
  • FIG. 2B is a cross-sectional view showing a state where a tool is inserted into the spindle device shown in FIG. FIG.
  • It is other principal part sectional drawing of the spindle apparatus of the machine tool which concerns on one Example of this invention.
  • It is further principal part sectional drawing of the spindle apparatus of the machine tool which concerns on one Example of this invention.
  • It is sectional drawing which shows an example of the tool which can adjust the position of the radial direction of a blade.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5.
  • FIG. 1 is an overall view of the spindle device according to the present embodiment
  • FIG. 2A is a cross-sectional view showing a state when the spindle device according to the present embodiment is unclamped
  • FIG. 2B is a view in FIG. 3 is a cross-sectional view showing a state in which a tool is inserted into the main spindle apparatus shown in FIG. 3
  • FIG. 3 is a cross-sectional view showing a state before clamping of the main spindle apparatus according to the present embodiment
  • FIG. FIG. 5 is a cross-sectional view showing an example of a tool having an internal correction function
  • FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.
  • the spindle device is a spindle device of a machine tool having an automatic tool change function, and as shown in FIG.
  • the draw bar drive shaft 3 is rotatably supported, and one end side is supported by a shaft hole 2a formed on the axis of the main shaft 2 so as to be movable back and forth, while the other end side is on the axis of the draw bar drive shaft 3.
  • the main shaft side draw bar 4 is provided as a main shaft side correction shaft that is rotatably supported in the formed shaft hole 3a.
  • the tool 5 is attached to and detached from the tip of the spindle device by an automatic tool change function.
  • the main shaft 2 is rotationally driven by a main shaft driving motor 6 as a first driving means.
  • the main shaft side transmission gear 7 fixed to the peripheral surface of the main shaft 2 meshes with the main shaft drive motor side transmission gear 8 fixed to the shaft 6a of the main shaft drive motor 6, and the rotation of the shaft 6a of the main shaft drive motor 6 is rotated. It is configured to be transmitted to the main shaft 2.
  • the draw bar drive shaft 3 is linearly driven by a draw bar drive motor 9 as second drive means.
  • the drawbar drive shaft 3 has a threaded portion 3b on its peripheral surface, and the threaded portion 3b is screwed into a nut 12 that is rotatably supported on the housing 1 side.
  • a drawbar drive shaft side transmission gear 10 is arranged on the same axis as the drawbar drive shaft 3, and the drawbar drive shaft side transmission gear 10 is fixed to the shaft 9 a of the drawbar drive motor 9. 11 is engaged.
  • the main shaft side draw bar 4 can move forward and backward with respect to the main shaft 2 and is configured to rotate integrally with the main shaft 2. Moreover, while being rotatable with respect to the draw bar drive shaft 3, it is in a locked state in the axial direction. That is, the main shaft side draw bar 4 is configured to rotate integrally with the main shaft 2 and to move forward and backward integrally with the draw bar drive shaft 3.
  • a coolant supply path 4 a for supplying coolant to the tool 5 side is formed on the main shaft side draw bar 4.
  • the spindle device of the present embodiment includes a correction axis, a tool having an internal correction function configured to change the position of the blade edge by moving the correction axis forward and backward, and such an internal correction function.
  • An ordinary tool that is not provided for example, HSK standard
  • amendment function comprised so that the position of the radial direction of a blade tip can be changed is demonstrated as an example as a tool with which a spindle apparatus is equipped.
  • the tool 5 includes a shaft body 13 constituting a tool body, and a tool-side draw bar 14 inserted through a shaft hole 13 a formed on the axis of the shaft body 13 so as to be able to advance and retract. And a plurality of cutting tools (blades) 15 that are held on the shaft body 13 so that their positions in the radial direction can be adjusted.
  • the shaft body 13 includes a tool holder 13b at the base end thereof.
  • the tool holder 13b is formed in a cylindrical shape, and a concave portion 13c formed by expanding a part of the inner wall in the radial direction is formed on the inner wall thereof.
  • the base end part of the tool holder 13b protrudes to radial inside, and comprises the thick part 13d.
  • the shape of the tool holder 13b is the same as that of a normal tool (for example, JIS-B6064) applied to a machine tool having an automatic tool change function.
  • the tool side draw bar 14 is provided with a pull stud 14a at the base end portion thereof and a coolant supply path 14b on the axis thereof. Further, a tapered surface 14c is formed on the tip side of the tool-side draw bar 14 so as to be inclined so as to reduce the diameter toward the tip.
  • the cutting tool 15 is held by the shaft body 13 via the support member 16.
  • the cutting tool 15 is disposed at a position facing the tapered surface 14c.
  • One end side of the support member 16 (the main shaft device side in FIG. 5) is locked to the shaft body 13, while the other end side (the opposite side to the main shaft device in FIG. 5) is movable in the radial direction by, for example, elastic deformation. It is configured.
  • the shaft body 13 is provided with a pin 17 at substantially the same position as the cutting tool 15 so as to penetrate in the radial direction.
  • the pin 17 has a radially outer end in contact with the support member 16 and a radially inner end in contact with the tapered surface 14c.
  • the tool 5 can adjust the radial position of the cutting tool 15 by the forward and backward movement of the tool-side draw bar 14.
  • the pin 17 is pressed radially inward by the restoring force of the support member 16, and the other end side of the pin 17 and the support member 16 radially inward along the inclination of the tapered surface 14c.
  • the cutting diameter by the cutting tool 15 is reduced.
  • the tool side draw bar 14 is moved to the rearmost position within the movable range, for example, the entire inner peripheral portion of the support member 16 is in contact with the shaft body 13.
  • the spindle device is provided with a clamp mechanism 18 for realizing an automatic tool change function as shown in FIG.
  • the clamp mechanism 18 includes a first guide cylinder 19 and a second guide cylinder 20 constituting a guide member, a tool holder clamper 21 as a first restraining member, and a tool side draw bar as a second restraining member. And a clamper 22.
  • the first guide cylinder 19 is a cylindrical member for moving the second guide cylinder 20 forward and backward relative to the main shaft 2, and is inserted through the shaft hole 2a of the main shaft 2 so as to be able to advance and retract as shown in FIG. ing.
  • the first guide cylinder 19 is formed with a shaft hole 19a on the axis, a small diameter portion 19b formed by reducing a part of the outer peripheral surface, and a flange 19c formed at the base end portion. ing.
  • the main shaft side draw bar 4 is inserted into the shaft hole 19a so as to be movable back and forth.
  • a disc spring 23 is disposed in a space formed between the small diameter portion 19b and the main shaft 2.
  • the disc spring 23 has its tip on the tool 5 side in contact with the main shaft 2 and is restricted from moving forward, while its other end is in contact with the first guide cylinder 19.
  • the flange 19c is in contact with a hydraulic cylinder 24 as pressing means disposed so as to face the flange 19c.
  • the first guide cylinder 19 moves to the tool 5 side when the hydraulic cylinder 24 presses the flange 19c, and after being advanced to the tool 5 side, the press by the hydraulic cylinder 24 is released to release the disc spring 23. It is designed to move backwards by the urging force.
  • the second guide cylinder 20 is a member provided to move the tool holder clamper 21 and the tool side drawbar clamper 22 to the clamp position and the unclamp position, respectively, as shown in FIGS.
  • the shaft 2 is inserted into the shaft hole 2 a of the main shaft 2, and its base end is fixed to the tip of the first guide tube 19 so as to advance and retract integrally with the first guide tube 19.
  • the second guide cylinder 20 has an outer diameter that is smaller than the inner diameter of the main shaft 2 and has a gap between the inner peripheral surface 2b of the main shaft 2 and on the axis. It has a shaft hole 20a.
  • the outer peripheral surface functions as a guide surface for the tool holder clamper 21, while the inner peripheral surface functions as a guide surface for the tool-side drawbar clamper 22.
  • the main shaft side draw bar 4 is inserted into the shaft hole 20a so as to be movable back and forth.
  • the second guide tube 20 is formed with a convex portion 20b having an enlarged outer peripheral surface.
  • the convex portion 20b is inclined so that its diameter increases as it goes to the tool 5 side.
  • the recessed part 20c formed by expanding the inner peripheral surface is formed.
  • the concave portion 20c is inclined so that its diameter expands and contracts along the axial direction.
  • the tool holder clamper 21 is a member for clamping and unclamping the tool holder 13b, and is disposed in the gap between the inner peripheral surface 2b of the main shaft 2 and the second guide cylinder 20.
  • the tool holder clamper 21 is configured such that a base end portion 21a is engaged with an inner peripheral surface 2b of the main shaft 2 and a tip end portion 21b is movable in a radial direction.
  • the tip end portion 21b of the tool holder clamper 21 protrudes radially outward so as to engage with the recess 13c of the tool holder 13b and lock the thick portion 13d when the tool holder 13b is clamped, thereby forming a locking portion. Yes.
  • a spring 25 for biasing the tool holder clamper 21 radially inward is attached to the outer periphery of the tool holder clamper 21.
  • the tool-side drawbar clamper 22 is a member for clamping and unclamping the tool-side drawbar 14, and is engaged with the pull stud 4b of the spindle-side drawbar 4 by a spring 26 attached to the outer periphery thereof.
  • the two guide cylinders 20 are inserted into the shaft holes 20a. Thereby, the tool side draw bar clamper 22 can move forward and backward integrally with the main shaft side draw bar 4.
  • the tool-side drawbar clamper 22 is locked in the gap between the pull stud 4b formed at the distal end of the main shaft-side drawbar 4 and the inner peripheral surface 20c of the second guide cylinder 20.
  • the tip 22b is configured to be movable in the radial direction.
  • the tip 22b of the tool-side drawbar clamper 22 is set in shape so as to lock the pull stud 14a of the tool-side drawbar 14 during clamping.
  • the tool holder clamper 21 and the tool side drawbar clamper 22 slide along the convex portion 20b and the concave portion 20c of the second guide cylinder 20, respectively.
  • the tip 21b of the tool holder clamper 21 moves radially inward, and the outer diameter of the tip 21b becomes smaller than the inner diameter of the tool holder 13b.
  • the tool-side draw bar clamper 22 has its tip 22b moved radially outward so that the inner diameter of the tip 22b is larger than the outer diameter of the pull stud 14a of the tool-side draw bar 14. In such a state, the tool holder 13b is inserted into the shaft hole 2a of the main shaft 2 as shown in FIG.
  • the pressure by the hydraulic cylinder 24 is released, and the first guide cylinder 19 is pressed by the disc spring 23, so that the first guide cylinder 19 and the first guide cylinder 19 are integrated with each other as shown in FIG.
  • the fixed second guide cylinder 20 is moved backward.
  • the tool holder clamper 21 and the tool side draw bar clamper 22 slide along the convex portion 20b and the concave portion 20c of the second guide cylinder 20, respectively, and the tip end portion 21b of the tool holder clamper 21 has a diameter.
  • the tool holder 13b is clamped by moving outward in the direction.
  • the tip 22b of the tool-side draw bar clamper 22 moves radially inward to clamp the pull stud 14a of the tool-side draw bar 14. This completes the mounting of the tool 5 on the spindle device.
  • the draw bar drive motor 9 is driven during the movement of the spindle device, and the tool side draw bar 14 is passed through the draw bar drive shaft 3 and the spindle side draw bar 4 as shown in FIG. Is moved to a desired position (for example, the position shown in FIG. 5). Thereafter, the spindle 2 is rotated by the spindle drive motor 6 to start machining.
  • the spindle-side draw bar 4 is moved backward to pass through the tool-side draw bar clamper 22.
  • the tool side draw bar 14 can be pulled backward.
  • the tool draw bar clamper 22 is not provided, the tool draw bar 14 is pushed backward only by the spring built in the tool 5, whereas in this embodiment, the tool side draw bar 14 is reliably moved backward. And reliability can be improved.
  • the draw bar drive motor 9 is driven to move the spindle side draw bar 4 and the tool side draw bar 14 to the clamp positions shown in FIG.
  • the first guide cylinder 19 and the second guide cylinder 20 are advanced as shown in FIG.
  • the tip 21b of the tool holder clamper 21 moves radially inward, and the outer diameter of the tip 21b becomes smaller than the inner diameter of the tool holder 13b.
  • the tool-side drawbar clamper 22 has its tip 22b moved radially outward so that the inner diameter of the tip 22b is larger than the outer diameter of the pull stud 14a of the tool-side drawbar 14. In this state, the tool 5 is removed from the main shaft 2.
  • the first guide cylinder 19 and the second guide cylinder 20 are moved forward and backward to move the tool.
  • the normal tool can be attached and detached by clamping and unclamping the tool holder of the normal tool by the holder clamper 21.
  • the first guide cylinder 19 and the second guide cylinder 20 are configured to be slidable with respect to the spindle-side drawbar 4, and the hydraulic cylinder 24, the dish
  • the tool holder 13b and the tool side draw bar 14 are simultaneously clamped by the tool holder clamp 21 and the tool side draw bar clamp 22 respectively. Unclamping is possible, and the working efficiency required for processing can be improved.
  • the clamping mechanism 18 includes the tool-side draw bar 14 shown in FIGS. 5 and 6, and the cutting edge of the tool 5 such as the tool 5 that can adjust the cutting diameter of the cutting tool 15 by the forward and backward movement of the tool-side draw bar 14.
  • the special tool has a configuration that can clamp and unclamp both a tool with an internal compensation function that can adjust the position of the tool and a normal tool that is applied to a machine tool with an automatic tool change function. And normal tools can be used together on a common machine tool, improving versatility. Furthermore, since the correction operation for adjusting the position of the cutting edge of the tool 5 described above can be performed during the movement of the spindle device related to automatic tool change, a dedicated time for only the correction operation does not occur, and the cycle time is reduced. It is possible to prevent the extension and perform machining in the machine tool with high efficiency.
  • the first guide cylinder 19 and the second guide cylinder 20 are described as separate members, but they may be integrated.
  • the tool 5 shown in FIG. 5 is an example and includes a tool-side draw bar, and the position of the blade edge can be adjusted according to the forward and backward movement of the tool-side draw bar (for example, the position of the blade edge can be moved in the axial direction).
  • the spindle device of the machine tool according to the present invention can be applied to the tool configured as described above.
  • the shapes of the second guide cylinder 20, the tool holder clamper 21, and the tool side draw bar clamper 22 shown in the above-described embodiment are merely examples, and the first guide cylinder 19 and the second guide cylinder 20 are moved forward and backward.
  • the tool holder 13b and the tool side draw bar 14 may be simultaneously clamped and unclamped by the tool holder clamper 21 and the tool side draw bar clamper 22.
  • the present invention is applicable to a spindle device of a machine tool having an automatic tool change function, and in particular, has an internal correction function configured such that the position of the blade edge can be adjusted by a shaft body provided on the axis line of the tool.
  • the tool provided is suitable for application to a spindle device configured to be automatically replaceable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

Disclosed is a main shaft device equipped with an automatic tool exchange function, and provided with: a first guide tube (19), which is inserted into the shaft hole (2a) of a main shaft (2), and into the shaft hole (19a) of which a main shaft-side draw bar (4) is inserted, and which moves forward and backward, and a second guide tube (20); a tool holder clamper (21), one end of which latches on the inner circumferential surface (2b) of the main shaft (2) and the other end of which is slidably formed along a convex part (20b) of the second guide tube (20); and a clamper (22) for a tool-side draw bar, one end of which latches on the tip part of the main shaft-side draw bar (4) and the other end of which is slidably formed along a concave part (20c) of the second guide tube (20); thus, a tool (5), the position of the blade edge of which can be changed by moving the main shaft-side draw bar (4) backward or forward, can be attached or detached by means of the automatic tool exchange function, and combination use with a normal tool is realized.

Description

工作機械の主軸装置Machine tool spindle equipment
　本発明は、工作機械の主軸装置に関し、特に自動工具交換機能を備えた工作機械の主軸装置における工具ホルダの着脱構造に関する。 The present invention relates to a spindle device of a machine tool, and more particularly to a tool holder attaching / detaching structure in a spindle device of a machine tool having an automatic tool change function.
　従来、自動工具交換機能を備えた工作機械の主軸装置における工具ホルダの着脱構造としては、主軸装置に、主軸の先端に固定された案内筒と、この案内筒の軸孔に摺動偏位可能に装着されたロックロッドとからなるクランピングユニットを設け、ロックロッドの進退動により工具をクランプ・アンクランプするようにしたものがある（例えば、特許文献１参照）。 Conventionally, as a tool holder attaching / detaching structure in a spindle device of a machine tool equipped with an automatic tool change function, a guide cylinder fixed to the tip of the spindle and a sliding displacement can be made in the shaft hole of the guide cylinder. There is a type in which a clamping unit including a lock rod attached to the machine is provided, and the tool is clamped and unclamped by advancement and retraction of the lock rod (for example, see Patent Document 1).
　このものは、案内筒に工具ホルダの拘束部であるテーパ部を内嵌する内筒部を設けるとともに、案内筒の内筒部と工具ホルダのテーパ部とにそれぞれ径方向に貫通して球体が嵌合される透孔を形成し、ロックロッドの進退動に応じて上記球体を径方向に移動させることにより工具ホルダをクランプ・アンクランプするようにしている。 This is provided with an inner cylinder part into which a taper part which is a restraint part of the tool holder is fitted in the guide cylinder, and the spherical body penetrates the inner cylinder part of the guide cylinder and the taper part of the tool holder respectively in the radial direction. A through hole to be fitted is formed, and the tool holder is clamped and unclamped by moving the sphere in the radial direction in accordance with the forward and backward movement of the lock rod.
　また、主軸の軸線上に形成された軸孔に挿通され、軸方向に進退動を行うドローバーと、このドローバーの先端に設けられ工具のプルスタッドを挿通するスリーブとを有し、ドローバーの進退動に応じて工具をクランプ・アンクランプするようにしたものもある（例えば、特許文献２参照）。 The draw bar is inserted into a shaft hole formed on the axis of the main shaft, and moves forward and backward in the axial direction, and a sleeve provided at the tip of the draw bar and through which a tool pull stud is inserted. In some cases, the tool is clamped / unclamped according to the above (for example, see Patent Document 2).
　このものは、スリーブに径方向に貫通する孔を形成し、この孔にボールコレットを径方向に退避可能に保持する一方、ドローバーを進退動可能に支持するスピンドル軸の軸孔にスリーブの外径とほぼ等しい小径部とスリーブの外径に比較して径が大きい大径部とを設け、ドローバーの進退動に応じてボールコレットを径方向に移動させることにより工具ホルダのプルスタッドをクランプ・アンクランプするようにしている。 This has a hole that penetrates the sleeve in the radial direction and holds the ball collet in the hole so that it can be retracted in the radial direction, while the outer diameter of the sleeve is in the shaft hole of the spindle shaft that supports the draw bar so that it can move forward and backward. A small diameter part that is almost equal to the outer diameter of the sleeve, and a large diameter part that is larger than the outer diameter of the sleeve. I try to clamp it.
　そして、工作機械における加工に用いられる工具として、工具の軸線上に形成された軸孔に進退動可能にドローバーを挿通し、工具の刃先（チップ）の径方向の位置をドローバーの進退動に応じて調整することによりチップの摩耗補正を行う工具（例えば、特許文献３参照）や、工具の刃先の径方向の位置をドローバーの進退動に応じて調整することによりこの工具による切削径を変更する工具（例えば、特許文献４参照）等の内部補正機能を備えた工具が公知となっている。 Then, as a tool used for machining in a machine tool, a draw bar is inserted into an axial hole formed on the axis of the tool so as to be able to advance and retract, and the radial position of the cutting edge (tip) of the tool is determined according to the advance and retreat of the draw bar. By adjusting the tool, the cutting diameter of the tool is corrected by adjusting the position of the cutting edge of the tool in the radial direction according to the advancement and retraction of the draw bar. A tool having an internal correction function such as a tool (see, for example, Patent Document 4) is known.
特開平９－２３９６３７号公報Japanese Patent Laid-Open No. 9-239637 特開平９－３１４４０４号公報JP-A-9-314404 実開平３－６５６０３号公報Japanese Utility Model Publication No. 3-65603 実開平３－６５６０４号公報Japanese Utility Model Publication No. 3-65604
　しかしながら、従来、上述したようなドローバーの進退動によって刃先の位置を調整する内部補正機能を備えた工具（以下、特殊工具という）を、例えばＪＩＳ－Ｂ６０６４に準拠した一般的な工具（以下、通常工具という）に用いられる自動工具交換機能を備えた工作機械の主軸装置に適用することはできなかった。そのため、従来の内部補正機能を備える特殊工具を用いる加工においては、自動工具交換機能を備えない専用の工作機械を用いる、または、上述したような一般的な工具を併用することのできない特殊な自動工具交換機能を備えた工作機械を用いる必要があり、高精度加工、高信頼性加工と汎用性とを両立することができなかった。 However, conventionally, a tool having an internal correction function (hereinafter referred to as a special tool) that adjusts the position of the blade edge by the forward and backward movement of the draw bar as described above, for example, a general tool (hereinafter referred to as a normal tool) conforming to JIS-B6064, for example. It could not be applied to a spindle device of a machine tool having an automatic tool change function used for a tool). Therefore, in machining using a special tool having a conventional internal correction function, a special machine tool that does not have an automatic tool change function is used, or a special automatic tool that cannot be used with a general tool as described above. It was necessary to use a machine tool with a tool change function, and high precision machining, high reliability machining and versatility could not be achieved at the same time.
　このようなことから本発明は、補正軸を進退動させることにより刃先の位置を変更可能に構成された工具を自動工具交換機能によって着脱させることを可能とし、且つ通常工具との併用を可能とした工作機械の主軸装置を提供することを目的とする。 For this reason, the present invention makes it possible to attach and detach a tool configured to change the position of the blade edge by moving the correction axis forward and backward by an automatic tool change function, and to use it together with a normal tool. An object of the present invention is to provide a spindle device for a machine tool.
　上記の課題を解決するための第１の発明に係る工作機械の主軸装置は、自動工具交換機能を備え、ハウジングに回転可能に支持されて第一の駆動手段により回転駆動される主軸と、前記主軸の軸線上に形成された軸孔に進退動可能に挿通され、第二の駆動手段により進退動を行う主軸側補正軸とを備えた主軸装置において、前記主軸の軸孔に挿通されるとともに、前記主軸側補正軸を軸線上に形成された軸孔に挿通し、第三の駆動手段により進退動を行う案内部材と、一端が前記主軸の内周面に係止され他端が前記案内部材の外周面に沿って摺動可能に構成された第一拘束部材と、一端が前記主軸側補正軸の先端部に係止され他端が前記案内部材の内周面に沿って摺動可能に構成された第二拘束部材とを備え、前記案内部材の進退動に応じ、前記第一拘束部材の他端が前記案内部材の外周面に形成された凸状部に沿って拡径・縮径されることにより前記主軸の先端に装着される工具の工具ホルダの拘束・開放を行う一方、前記第二拘束部材の他端が前記案内部材の内周面に形成された凹状部に沿って縮径・拡径されることにより前記工具に内蔵される工具側補正軸の拘束・開放を行うように構成されたことを特徴とする。 A spindle device of a machine tool according to a first invention for solving the above-mentioned problem, comprising a spindle having an automatic tool change function, rotatably supported by a housing and driven to rotate by a first drive means, In a spindle device including a spindle-side correction shaft that is inserted into a shaft hole formed on the axis of the spindle so as to be able to advance and retract and is advanced and retracted by a second driving means, and inserted into the shaft hole of the spindle. A guide member for inserting the main shaft side correction shaft into a shaft hole formed on the axis, and advancing and retreating by a third driving means; one end locked to the inner peripheral surface of the main shaft and the other end being the guide A first restraining member configured to be slidable along the outer peripheral surface of the member, and one end locked to the tip of the main shaft side correction shaft and the other end slidable along the inner peripheral surface of the guide member And a second restraining member configured in accordance with the forward and backward movement of the guide member The other end of the first restraining member is enlarged or reduced in diameter along a convex portion formed on the outer peripheral surface of the guide member, thereby restraining / releasing the tool holder of the tool attached to the tip of the main shaft. While the other end of the second restraining member is contracted / expanded along a concave portion formed on the inner peripheral surface of the guide member, thereby restraining the tool side correction shaft built in the tool. -It is characterized by being configured to open.
　上記の課題を解決するための第２の発明に係る工作機械の主軸装置は、第１の発明に係る工作機械の主軸装置において、前記第一拘束部材は、前記他端に、前記案内部材の進退動によって拡径された際に前記工具ホルダの先端に形成された厚肉部に係合して前記厚肉部を係止する係止部を有し、前記第二拘束部材は、前記他端側に、前記案内部材の進退動によって縮径された際に前記工具側補正軸のプルスタッドに係合して前記プルスタッドを係止する係止部を有することを特徴とする。 A spindle device of a machine tool according to a second invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first invention, wherein the first restraining member is disposed at the other end of the guide member. When the diameter is expanded by advancing and retreating, it has a locking portion that engages with the thick portion formed at the tip of the tool holder and locks the thick portion, and the second restraining member includes the other It is characterized by having a locking portion on the end side for engaging with the pull stud of the tool side correction shaft to lock the pull stud when the diameter is reduced by the forward and backward movement of the guide member.
　上記課題を解決するための第３の発明に係る工作機械の主軸装置は、第１又は第２の発明に係る工作機械の主軸装置において、前記第三の駆動手段は、前記案内部材を前方へ押圧する押圧手段と、前記案内部材を後方へ付勢する皿バネとから構成されたことを特徴とする。 A spindle device of a machine tool according to a third aspect of the present invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first or second aspect of the invention, wherein the third drive means moves the guide member forward. It is comprised from the press means to press, and the disk spring which urges | biases the said guide member back.
　上記課題を解決するための第４の発明に係る工作機械の主軸装置は、第１又は第２の発明に係る工作機械の主軸装置において、前記案内筒は、前記第三の駆動手段による前記案内部材の進退動のみにより、前記第一拘束部材及び前記第二拘束部材による前記工具ホルダ及び前記工具側補正軸の拘束・開放を行うように前記凸状部及び前記凹状部の形状を設定されたことを特徴とする。 A spindle device of a machine tool according to a fourth aspect of the present invention for solving the above-mentioned problem is the spindle device of the machine tool according to the first or second aspect of the invention, wherein the guide cylinder is the guide by the third drive means. The shape of the convex part and the concave part is set so that the tool holder and the tool side correction shaft are restrained and released by the first restraining member and the second restraining member only by the advance and retreat of the member. It is characterized by that.
　上記課題を解決するための第５の発明に係る工作機械の主軸装置は、第４の発明に係る工作機械の主軸装置において、前記第一拘束部材は、自動工具交換機能を有する工作機械に適用される通常工具の工具ホルダに対する拘束・開放を可能に構成されたことを特徴とする。 A spindle device of a machine tool according to a fifth aspect of the present invention for solving the above problem is a spindle device of a machine tool according to the fourth aspect of the invention, wherein the first restraining member is applied to a machine tool having an automatic tool change function. It is characterized in that it can be restrained / released with respect to the tool holder of a normal tool.
　上述した第１の発明に係る工作機械の主軸装置によれば、自動工具交換機能を備え、ハウジングに回転可能に支持されて第一の駆動手段により回転駆動される主軸と、主軸の軸線上に形成された軸孔に進退動可能に挿通され、第二の駆動手段により進退動を行う主軸側補正軸とを備えた主軸装置において、主軸の軸孔に挿通されるとともに、主軸側補正軸を軸線上に形成された軸孔に挿通し、第三の駆動手段により進退動を行う案内部材と、一端が主軸の内周面に係止され他端が案内部材の外周面に沿って摺動可能に構成された第一拘束部材と、一端が主軸側補正軸の先端部に係止され他端が案内部材の内周面に沿って摺動可能に構成された第二拘束部材とを備え、案内部材の進退動に応じ、第一拘束部材の他端が案内部材の外周面に形成された凸状部に沿って拡径・縮径されることにより主軸の先端に装着される工具の工具ホルダの拘束・開放を行う一方、第二拘束部材の他端が案内部材の内周面に形成された凹状部に沿って縮径・拡径されることにより工具に内蔵される工具側補正軸の拘束・開放を行うように構成されたので、補正軸を内蔵し、この補正軸を進退動させることによって刃先の位置を変更可能に構成された特殊工具を自動工具交換機能により着脱させることができ、その際に、案内部材を進退動させるだけで上記補正軸と工具ホルダとを拘束・開放することができる。 According to the spindle device of the machine tool according to the first aspect described above, the spindle having an automatic tool change function, rotatably supported by the housing and driven to rotate by the first drive means, and on the axis of the spindle In a spindle device including a spindle-side correction shaft that is inserted into the formed shaft hole so as to be able to advance and retract and is moved forward and backward by the second driving means, the spindle device is inserted into the shaft hole of the spindle and the spindle-side correction shaft is A guide member that is inserted into the shaft hole formed on the axis and moves forward and backward by the third driving means, and one end is locked to the inner peripheral surface of the main shaft and the other end slides along the outer peripheral surface of the guide member A first constraining member configured to be able to be configured, and a second constraining member configured to be slidable along the inner peripheral surface of the guide member with one end locked to the tip of the main shaft side correction shaft. The other end of the first restraining member is formed on the outer peripheral surface of the guide member according to the advancement and retraction of the guide member The tool holder of the tool mounted on the tip of the spindle is constrained / released by being expanded / reduced along the convex portion, while the other end of the second constraining member is the inner peripheral surface of the guide member The tool side correction shaft built in the tool is constrained / released by reducing or expanding the diameter along the concave part formed in the tool. A special tool that can change the position of the cutting edge by moving it back and forth can be attached and detached by the automatic tool change function. At this time, the guide shaft is moved forward and backward to restrain the correction shaft and tool holder.・ Can be opened.
　また、第２の発明に係る工作機械の主軸装置によれば、第一拘束部材は、他端に、当該他端が案内部材の進退動によって拡径された際に工具ホルダの先端に形成された厚肉部に係合して厚肉部を係止する係止部を有し、第二拘束部材は、他端側に、当該他端が案内部材の進退動によって縮径された際に工具側補正軸のプルスタッドに係合してプルスタッドを係止する係止部を有するので、上記補正軸、工具ホルダの拘束・開放を確実に行うことができる。 Further, according to the spindle device of the machine tool according to the second invention, the first restraining member is formed at the other end and at the tip of the tool holder when the other end is expanded by the advancement and retraction of the guide member. The second restraining member is engaged with the thick part and the thick part is engaged, and the second restraining member is moved to the other end side when the other end is reduced in diameter by advancing and retreating of the guide member. Since there is a locking portion that engages with the pull stud of the tool side correction shaft to lock the pull stud, the correction shaft and the tool holder can be reliably restrained and released.
　また、第３の発明に係る工作機械の主軸装置によれば、第三の駆動手段は、案内部材を前方へ押圧する押圧手段と、案内部材を後方へ付勢する皿バネとから構成されたので、案内筒の進退動を円滑に行うことができる。 Further, according to the spindle device of the machine tool according to the third invention, the third drive means is constituted by a pressing means for pressing the guide member forward and a disc spring for biasing the guide member backward. Therefore, the guide tube can be smoothly advanced and retracted.
　また、第４の発明に係る工作機械の主軸装置によれば、案内筒は、第三の駆動手段による案内部材の進退動のみにより、第一拘束部材及び第二拘束部材による工具ホルダ及び工具側補正軸の拘束・開放を行うように凸状部及び凹状部の形状を設定されたので、案内部材の進退動のみにより上記補正軸と工具ホルダとを同時に拘束又は開放することができ、作業能率が向上する。 According to the spindle device of the machine tool according to the fourth aspect of the invention, the guide tube is moved only by the forward and backward movement of the guide member by the third drive means, and the tool holder and the tool side by the first restraint member and the second restraint member. Since the shape of the convex part and the concave part is set so as to constrain and release the correction axis, the correction axis and the tool holder can be constrained or released at the same time only by advancing and retreating the guide member. Will improve.
　また、第５の発明に係る工作機械の主軸装置によれば、第一拘束部材は、自動工具交換機能を有する工作機械に適用される通常工具の工具ホルダに対する拘束・開放を可能に構成されたので、上記特殊工具と通常工具とを、自動工具交換機能を有する共通の工作機械に適用することができ、高精度、高信頼性、高能率加工と汎用性とを両立することができる。 Further, according to the spindle device of the machine tool according to the fifth invention, the first restraining member is configured to be capable of restraining / releasing the tool holder of a normal tool applied to a machine tool having an automatic tool changing function. Therefore, the special tool and the normal tool can be applied to a common machine tool having an automatic tool change function, and both high accuracy, high reliability, high efficiency machining and versatility can be achieved.
本発明の一実施例に係る工作機械の主軸装置の全体図である。1 is an overall view of a spindle device of a machine tool according to an embodiment of the present invention. 図２（ａ）は本発明の一実施例に係る工作機械の主軸装置の要部断面図、図２（ｂ）は図２（ａ）に示す主軸装置に工具が挿通された状態を示す断面図である。2A is a cross-sectional view of a main part of a spindle device of a machine tool according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view showing a state where a tool is inserted into the spindle device shown in FIG. FIG. 本発明の一実施例に係る工作機械の主軸装置の他の要部断面図である。It is other principal part sectional drawing of the spindle apparatus of the machine tool which concerns on one Example of this invention. 本発明の一実施例に係る工作機械の主軸装置のさらに他の要部断面図である。It is further principal part sectional drawing of the spindle apparatus of the machine tool which concerns on one Example of this invention. 刃の径方向の位置を調整可能な工具の一例を示す断面図である。It is sectional drawing which shows an example of the tool which can adjust the position of the radial direction of a blade. 図５のVI－VI矢視断面図である。FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5.
　以下、図面を参照して本発明に係る工作機械の主軸装置の詳細を説明する。 Hereinafter, details of the spindle device of the machine tool according to the present invention will be described with reference to the drawings.
　図１は本実施例に係る主軸装置の全体図、図２（ａ）は本実施例に係る主軸装置のアンクランプ時の状態を示す断面図、図２（ｂ）は図２（ａ）に示す主軸装置に工具を挿入した状態を示す断面図、図３は本実施例に係る主軸装置の補正前のクランプ時の状態を示す断面図、図４は本実施例に係る主軸装置の刃先の位置を補正した後の状態を示す断面図、図５は内部補正機能を有する工具の一例を示す断面図、図６は図５のVI－VI矢視断面図である。 FIG. 1 is an overall view of the spindle device according to the present embodiment, FIG. 2A is a cross-sectional view showing a state when the spindle device according to the present embodiment is unclamped, and FIG. 2B is a view in FIG. 3 is a cross-sectional view showing a state in which a tool is inserted into the main spindle apparatus shown in FIG. 3, FIG. 3 is a cross-sectional view showing a state before clamping of the main spindle apparatus according to the present embodiment, and FIG. FIG. 5 is a cross-sectional view showing an example of a tool having an internal correction function, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.
　本実施例に係る主軸装置は、自動工具交換機能を備えた工作機械の主軸装置であり、図１に示すように、ハウジング１に回動自在に収納支持される主軸２と、同じくハウジング１に回動自在に支持されるドローバー駆動シャフト３と、一端側を主軸２の軸線上に形成された軸孔２ａに進退動可能に支持される一方、他端側をドローバー駆動シャフト３の軸線上に形成された軸孔３ａに回転可能に軸支される主軸側補正軸としての主軸側ドローバー４とを備えている。この主軸装置の先端に自動工具交換機能により工具５が着脱される。 The spindle device according to the present embodiment is a spindle device of a machine tool having an automatic tool change function, and as shown in FIG. The draw bar drive shaft 3 is rotatably supported, and one end side is supported by a shaft hole 2a formed on the axis of the main shaft 2 so as to be movable back and forth, while the other end side is on the axis of the draw bar drive shaft 3. The main shaft side draw bar 4 is provided as a main shaft side correction shaft that is rotatably supported in the formed shaft hole 3a. The tool 5 is attached to and detached from the tip of the spindle device by an automatic tool change function.
　主軸２は第一駆動手段としての主軸駆動モータ６によって回転駆動される。詳しくは、主軸２の周面に固定された主軸側伝達ギア７が主軸駆動モータ６の軸６ａに固定された主軸駆動モータ側伝達ギア８と噛み合って、主軸駆動モータ６の軸６ａの回転が主軸２に伝達されるように構成されている。 The main shaft 2 is rotationally driven by a main shaft driving motor 6 as a first driving means. Specifically, the main shaft side transmission gear 7 fixed to the peripheral surface of the main shaft 2 meshes with the main shaft drive motor side transmission gear 8 fixed to the shaft 6a of the main shaft drive motor 6, and the rotation of the shaft 6a of the main shaft drive motor 6 is rotated. It is configured to be transmitted to the main shaft 2.
　また、ドローバー駆動シャフト３は第二駆動手段としてのドローバー駆動モータ９によって直進駆動される。詳しくは、ドローバー駆動シャフト３は、その周面にネジ部３ｂを備えており、このネジ部３ｂがハウジング１側に回転支持されたナット１２に螺合している。一方、ドローバー駆動シャフト３の同軸上にはドローバー駆動シャフト側伝達ギア１０が配置されており、このドローバー駆動シャフト側伝達ギア１０がドローバー駆動モータ９の軸９ａに固定されたドローバー駆動モータ側伝達ギア１１に噛み合っている。 Further, the draw bar drive shaft 3 is linearly driven by a draw bar drive motor 9 as second drive means. Specifically, the drawbar drive shaft 3 has a threaded portion 3b on its peripheral surface, and the threaded portion 3b is screwed into a nut 12 that is rotatably supported on the housing 1 side. On the other hand, a drawbar drive shaft side transmission gear 10 is arranged on the same axis as the drawbar drive shaft 3, and the drawbar drive shaft side transmission gear 10 is fixed to the shaft 9 a of the drawbar drive motor 9. 11 is engaged.
　これにより、ドローバー駆動モータ９を駆動させると、ドローバー駆動モータ９の軸９ａの回転がナット１２に伝達される。このようにドローバー駆動モータ９によってナット１２が回転駆動されると、上記ネジ部３ｂ及びナット１２によりドローバー駆動シャフト３が軸方向に進退動を行う。 Thus, when the draw bar drive motor 9 is driven, the rotation of the shaft 9 a of the draw bar drive motor 9 is transmitted to the nut 12. Thus, when the nut 12 is rotationally driven by the draw bar drive motor 9, the draw bar drive shaft 3 moves forward and backward in the axial direction by the screw portion 3b and the nut 12.
　主軸側ドローバー４は、主軸２に対して進退動可能であるとともに、主軸２と一体的に回転するように構成されている。また、ドローバー駆動シャフト３に対して回転可能である一方、軸方向には係止された状態となっている。即ち、主軸側ドローバー４は、主軸２と一体的に回転し、且つドローバー駆動シャフト３と一体的に進退動を行うように構成されている。この主軸側ドローバー４には、その軸線上に工具５側へクーラントを供給するためのクーラント供給路４ａが形成されている。 The main shaft side draw bar 4 can move forward and backward with respect to the main shaft 2 and is configured to rotate integrally with the main shaft 2. Moreover, while being rotatable with respect to the draw bar drive shaft 3, it is in a locked state in the axial direction. That is, the main shaft side draw bar 4 is configured to rotate integrally with the main shaft 2 and to move forward and backward integrally with the draw bar drive shaft 3. A coolant supply path 4 a for supplying coolant to the tool 5 side is formed on the main shaft side draw bar 4.
　ここで、本実施例の主軸装置は、補正軸を備え、この補正軸を進退動させることにより刃先の位置を変更可能に構成された内部補正機能を備える工具と、このような内部補正機能を備えない通常の工具（例えば、ＨＳＫ規格）とを併用可能に構成されている。以下、主軸装置に装着される工具として、刃先の径方向の位置を変更可能に構成された内部補正機能を備えた工具５を用いる場合を例に説明する。 Here, the spindle device of the present embodiment includes a correction axis, a tool having an internal correction function configured to change the position of the blade edge by moving the correction axis forward and backward, and such an internal correction function. An ordinary tool that is not provided (for example, HSK standard) can be used together. Hereinafter, the case where the tool 5 provided with the internal correction | amendment function comprised so that the position of the radial direction of a blade tip can be changed is demonstrated as an example as a tool with which a spindle apparatus is equipped.
　図５及び図６に示すように、工具５は、工具本体を構成する軸体１３と、この軸体１３の軸線上に形成された軸孔１３ａに進退動可能に挿通された工具側ドローバー１４と、軸体１３に径方向の位置を調整可能に保持された複数のバイト（刃）１５とを備えている。 As shown in FIGS. 5 and 6, the tool 5 includes a shaft body 13 constituting a tool body, and a tool-side draw bar 14 inserted through a shaft hole 13 a formed on the axis of the shaft body 13 so as to be able to advance and retract. And a plurality of cutting tools (blades) 15 that are held on the shaft body 13 so that their positions in the radial direction can be adjusted.
　軸体１３は、その基端部に工具ホルダ１３ｂを備えている。工具ホルダ１３ｂは筒状に形成され、その内壁には、この内壁の一部を径方向に拡径してなる凹部１３ｃが形成されている。これにより、工具ホルダ１３ｂの基端部が径方向内側へ突出して厚肉部１３ｄを構成している。この工具ホルダ１３ｂは、その形状を自動工具交換機能を備えた工作機械に適用される通常工具（例えば、ＪＩＳ－Ｂ６０６４）の工具ホルダと同一の仕様としている。 The shaft body 13 includes a tool holder 13b at the base end thereof. The tool holder 13b is formed in a cylindrical shape, and a concave portion 13c formed by expanding a part of the inner wall in the radial direction is formed on the inner wall thereof. Thereby, the base end part of the tool holder 13b protrudes to radial inside, and comprises the thick part 13d. The shape of the tool holder 13b is the same as that of a normal tool (for example, JIS-B6064) applied to a machine tool having an automatic tool change function.
　また、工具側ドローバー１４は、その基端部にプルスタッド１４ａを備えるとともに、その軸線上にクーラント供給路１４ｂを備えている。さらに、この工具側ドローバー１４の先端側には、先端に向かうに従って縮径するように傾斜するテーパ面１４ｃが形成されている。 Further, the tool side draw bar 14 is provided with a pull stud 14a at the base end portion thereof and a coolant supply path 14b on the axis thereof. Further, a tapered surface 14c is formed on the tip side of the tool-side draw bar 14 so as to be inclined so as to reduce the diameter toward the tip.
　一方、バイト１５は、支持部材１６を介して軸体１３に保持されている。バイト１５はテーパ面１４ｃに対向する位置に配置されている。支持部材１６はその一端側（図５では主軸装置側）が軸体１３に係止される一方、他端側（図５では主軸装置と反対側）が径方向に例えば弾性変形により移動可能に構成されている。 On the other hand, the cutting tool 15 is held by the shaft body 13 via the support member 16. The cutting tool 15 is disposed at a position facing the tapered surface 14c. One end side of the support member 16 (the main shaft device side in FIG. 5) is locked to the shaft body 13, while the other end side (the opposite side to the main shaft device in FIG. 5) is movable in the radial direction by, for example, elastic deformation. It is configured.
　そして、軸体１３には、バイト１５とほぼ同一位置に、径方向に貫通するようにピン１７が配設されている。このピン１７は、径方向外側の端部が支持部材１６に当接し、径方向内側の端部がテーパ面１４ｃに当接している。 The shaft body 13 is provided with a pin 17 at substantially the same position as the cutting tool 15 so as to penetrate in the radial direction. The pin 17 has a radially outer end in contact with the support member 16 and a radially inner end in contact with the tapered surface 14c.
　このように構成されることにより、工具５は、工具側ドローバー１４の進退動によってバイト１５の径方向の位置を調整することができるようになっている。 With this configuration, the tool 5 can adjust the radial position of the cutting tool 15 by the forward and backward movement of the tool-side draw bar 14.
　即ち、工具側ドローバー１４を前後に進退動させると、テーパ面１４ｃに当接したピン１７が径方向に移動する。より詳しくは、工具側ドローバー１４を前進させるとピン１７がテーパ面１４ｃの傾斜に沿って径方向外側へ移動し、これに伴って支持部材１６の上記他端側が径方向外側へ押圧されて径方向外側へ移動するため、バイト１５による切削径が大きくなる（図５、図６参照）。このとき、図６に示すようにピン１７の近傍において軸体１３と支持部材１６との間には空隙２７が形成された状態となる。 That is, when the tool side draw bar 14 is moved forward and backward, the pin 17 in contact with the tapered surface 14c moves in the radial direction. More specifically, when the tool side draw bar 14 is advanced, the pin 17 moves radially outward along the inclination of the tapered surface 14c, and the other end side of the support member 16 is pressed radially outward along with this. Since it moves outward in the direction, the cutting diameter by the cutting tool 15 increases (see FIGS. 5 and 6). At this time, as shown in FIG. 6, a gap 27 is formed between the shaft body 13 and the support member 16 in the vicinity of the pin 17.
　また、工具側ドローバー１４を後進させると支持部材１６の復元力によりピン１７が径方向内側へ押圧され、テーパ面１４ｃの傾斜に沿ってピン１７及び支持部材１６の上記他端側が径方向内側へ移動し、バイト１５による切削径が小さくなる。なお、図示はしないが工具側ドローバー１４を可動範囲内で最も後方まで移動させると、例えば支持部材１６の内周部全面が軸体１３に接した状態となる。 Further, when the tool side draw bar 14 is moved backward, the pin 17 is pressed radially inward by the restoring force of the support member 16, and the other end side of the pin 17 and the support member 16 radially inward along the inclination of the tapered surface 14c. The cutting diameter by the cutting tool 15 is reduced. Although not shown, when the tool side draw bar 14 is moved to the rearmost position within the movable range, for example, the entire inner peripheral portion of the support member 16 is in contact with the shaft body 13.
　さらに、本実施例に係る主軸装置は、図１に示すように自動工具交換機能を実現するためのクランプ機構１８を備えている。本実施例においてクランプ機構１８は、案内部材を構成する第一案内筒１９及び第二案内筒２０と、第一拘束部材としての工具ホルダ用クランパ２１と、第二拘束部材としての工具側ドローバー用クランパ２２とから構成されている。 Furthermore, the spindle device according to the present embodiment is provided with a clamp mechanism 18 for realizing an automatic tool change function as shown in FIG. In the present embodiment, the clamp mechanism 18 includes a first guide cylinder 19 and a second guide cylinder 20 constituting a guide member, a tool holder clamper 21 as a first restraining member, and a tool side draw bar as a second restraining member. And a clamper 22.
　第一案内筒１９は、第二案内筒２０を主軸２に対して進退動させるための筒状の部材であり、図１に示すように、主軸２の軸孔２ａに進退動可能に挿通されている。第一案内筒１９には軸線上に軸孔１９ａが形成されているとともに、その外周面の一部を縮径してなる小径部１９ｂが形成され、且つ、基端部にフランジ１９ｃが形成されている。 The first guide cylinder 19 is a cylindrical member for moving the second guide cylinder 20 forward and backward relative to the main shaft 2, and is inserted through the shaft hole 2a of the main shaft 2 so as to be able to advance and retract as shown in FIG. ing. The first guide cylinder 19 is formed with a shaft hole 19a on the axis, a small diameter portion 19b formed by reducing a part of the outer peripheral surface, and a flange 19c formed at the base end portion. ing.
　軸孔１９ａには主軸側ドローバー４が進退動可能に挿通されている。また、小径部１９ｂには主軸２との間に形成された空間に皿バネ２３が配設されている。この皿バネ２３は、工具５側の先端が主軸２に当接して前方への移動を規制されている一方、他端が第一案内筒１９に当接している。また、フランジ１９ｃはこのフランジ１９ｃに対向するように配設された押圧手段としての油圧シリンダ２４に当接している。 The main shaft side draw bar 4 is inserted into the shaft hole 19a so as to be movable back and forth. In addition, a disc spring 23 is disposed in a space formed between the small diameter portion 19b and the main shaft 2. The disc spring 23 has its tip on the tool 5 side in contact with the main shaft 2 and is restricted from moving forward, while its other end is in contact with the first guide cylinder 19. Further, the flange 19c is in contact with a hydraulic cylinder 24 as pressing means disposed so as to face the flange 19c.
　これにより、第一案内筒１９は、油圧シリンダ２４がフランジ１９ｃを押圧することにより工具５側へ移動し、工具５側へ前進させた後は油圧シリンダ２４による押圧を解除することによって皿バネ２３の付勢力により後進するようになっている。 Accordingly, the first guide cylinder 19 moves to the tool 5 side when the hydraulic cylinder 24 presses the flange 19c, and after being advanced to the tool 5 side, the press by the hydraulic cylinder 24 is released to release the disc spring 23. It is designed to move backwards by the urging force.
　また、第二案内筒２０は、工具ホルダ用クランパ２１および工具側ドローバー用クランパ２２をそれぞれクランプ位置、アンクランプ位置に移動させるために設けられた部材であり、図２乃至図４に示すように、主軸２の軸孔２ａに挿通されるとともに、その基端部が第一案内筒１９の先端に固定されて第一案内筒１９と一体的に進退動を行うように構成されている。 The second guide cylinder 20 is a member provided to move the tool holder clamper 21 and the tool side drawbar clamper 22 to the clamp position and the unclamp position, respectively, as shown in FIGS. The shaft 2 is inserted into the shaft hole 2 a of the main shaft 2, and its base end is fixed to the tip of the first guide tube 19 so as to advance and retract integrally with the first guide tube 19.
　この第二案内筒２０は、その外径が主軸２の内径に比較して小径に形成され、主軸２の内周面２ｂとの間に間隙を有した状態となっているとともに、軸線上に軸孔２０ａを有している。そして、外周面が工具ホルダ用クランパ２１の案内面として作用する一方、内周面が工具側ドローバー用クランパ２２の案内面として作用するようになっている。なお、軸孔２０ａには、主軸側ドローバー４が進退動可能に挿通されている。 The second guide cylinder 20 has an outer diameter that is smaller than the inner diameter of the main shaft 2 and has a gap between the inner peripheral surface 2b of the main shaft 2 and on the axis. It has a shaft hole 20a. The outer peripheral surface functions as a guide surface for the tool holder clamper 21, while the inner peripheral surface functions as a guide surface for the tool-side drawbar clamper 22. In addition, the main shaft side draw bar 4 is inserted into the shaft hole 20a so as to be movable back and forth.
　さらに、第二案内筒２０にはその外周面を拡径させてなる凸状部２０ｂが形成されている。凸状部２０ｂはその径が工具５側に向かうに従って拡径するように傾斜している。また、その内周面を拡径させてなる凹状部２０ｃが形成されている。凹状部２０ｃはその径が軸方向に沿って拡大・縮小するように傾斜している。 Further, the second guide tube 20 is formed with a convex portion 20b having an enlarged outer peripheral surface. The convex portion 20b is inclined so that its diameter increases as it goes to the tool 5 side. Moreover, the recessed part 20c formed by expanding the inner peripheral surface is formed. The concave portion 20c is inclined so that its diameter expands and contracts along the axial direction.
　工具ホルダ用クランパ２１は、工具ホルダ１３ｂをクランプ・アンクランプするための部材であり、主軸２の内周面２ｂと第二案内筒２０との間の間隙に配設されている。この工具ホルダ用クランパ２１は、その基端部２１ａが主軸２の内周面２ｂに係止される一方、先端部２１ｂが径方向に移動可能に構成されている。 The tool holder clamper 21 is a member for clamping and unclamping the tool holder 13b, and is disposed in the gap between the inner peripheral surface 2b of the main shaft 2 and the second guide cylinder 20. The tool holder clamper 21 is configured such that a base end portion 21a is engaged with an inner peripheral surface 2b of the main shaft 2 and a tip end portion 21b is movable in a radial direction.
　工具ホルダ用クランパ２１の先端部２１ｂは工具ホルダ１３ｂのクランプ時に工具ホルダ１３ｂの凹部１３ｃに係合して厚肉部１３ｄを係止するように径方向外側に突出して係止部を構成している。工具ホルダ用クランパ２１の外周には、この工具ホルダ用クランパ２１を径方向内側に付勢するバネ２５が装着されている。 The tip end portion 21b of the tool holder clamper 21 protrudes radially outward so as to engage with the recess 13c of the tool holder 13b and lock the thick portion 13d when the tool holder 13b is clamped, thereby forming a locking portion. Yes. A spring 25 for biasing the tool holder clamper 21 radially inward is attached to the outer periphery of the tool holder clamper 21.
　工具側ドローバー用クランパ２２は、工具側ドローバー１４をクランプ・アンクランプするための部材であり、その外周に装着されたバネ２６によって主軸側ドローバー４のプルスタッド４ｂに係止された状態で、第二案内筒２０の軸孔２０ａに挿通されている。これにより、工具側ドローバー用クランパ２２は、主軸側ドローバー４と一体的に進退動可能となっている。 The tool-side drawbar clamper 22 is a member for clamping and unclamping the tool-side drawbar 14, and is engaged with the pull stud 4b of the spindle-side drawbar 4 by a spring 26 attached to the outer periphery thereof. The two guide cylinders 20 are inserted into the shaft holes 20a. Thereby, the tool side draw bar clamper 22 can move forward and backward integrally with the main shaft side draw bar 4.
　より詳しくは、工具側ドローバー用クランパ２２は、その基端部２２ａが主軸側ドローバー４の先端に形成されたプルスタッド４ｂと第二案内筒２０の内周面２０ｃとの間の間隙に係止される一方、その先端部２２ｂが径方向に移動可能に構成されている。この工具側ドローバー用クランパ２２の先端部２２ｂは、クランプ時に工具側ドローバー１４のプルスタッド１４ａを係止するようにその形状を設定されている。 More specifically, the tool-side drawbar clamper 22 is locked in the gap between the pull stud 4b formed at the distal end of the main shaft-side drawbar 4 and the inner peripheral surface 20c of the second guide cylinder 20. On the other hand, the tip 22b is configured to be movable in the radial direction. The tip 22b of the tool-side drawbar clamper 22 is set in shape so as to lock the pull stud 14a of the tool-side drawbar 14 during clamping.
　以下に、図２乃至図４を用いて本実施例に係る主軸装置における工具５の自動交換の流れについて説明する。 Hereinafter, the flow of automatic replacement of the tool 5 in the spindle device according to the present embodiment will be described with reference to FIGS. 2 to 4.
　本実施例において主軸装置に工具５を装着する場合は、図２（ａ）に示すように、まず、油圧シリンダ２４を駆動して第一案内筒１９を押圧し、第一案内筒１９と、第一案内筒１９に一体的に固定された第二案内筒２０とを前進させる。 In the present embodiment, when the tool 5 is mounted on the spindle device, as shown in FIG. 2 (a), first, the hydraulic cylinder 24 is driven to press the first guide cylinder 19, The second guide tube 20 fixed integrally with the first guide tube 19 is advanced.
　このとき、工具ホルダ用クランパ２１、工具側ドローバー用クランパ２２は、それぞれ第二案内筒２０の凸状部２０ｂ、凹状部２０ｃに沿って摺動する。これにより、工具ホルダ用クランパ２１はその先端部２１ｂが径方向内側に移動して先端部２１ｂの外径が工具ホルダ１３ｂの内径より小さくなる。また、工具側ドローバー用クランパ２２はその先端部２２ｂが径方向外側へ移動して先端部２２ｂの内径が工具側ドローバー１４のプルスタッド１４ａの外径より大きくなる。このような状態において、図２（ｂ）に示すように工具ホルダ１３ｂを主軸２の軸孔２ａに挿入する。 At this time, the tool holder clamper 21 and the tool side drawbar clamper 22 slide along the convex portion 20b and the concave portion 20c of the second guide cylinder 20, respectively. As a result, the tip 21b of the tool holder clamper 21 moves radially inward, and the outer diameter of the tip 21b becomes smaller than the inner diameter of the tool holder 13b. In addition, the tool-side draw bar clamper 22 has its tip 22b moved radially outward so that the inner diameter of the tip 22b is larger than the outer diameter of the pull stud 14a of the tool-side draw bar 14. In such a state, the tool holder 13b is inserted into the shaft hole 2a of the main shaft 2 as shown in FIG.
　続いて、油圧シリンダ２４による押圧を解除し、第一案内筒１９が皿バネ２３によって押圧されることにより、図３に示すように第一案内筒１９と、第一案内筒１９に一体的に固定された第二案内筒２０とを後進させる。これにより、工具ホルダ用クランパ２１、工具側ドローバー用クランパ２２は、それぞれ第二案内筒２０の凸状部２０ｂ、凹状部２０ｃに沿って摺動し、工具ホルダ用クランパ２１の先端部２１ｂは径方向外側に移動して工具ホルダ１３ｂをクランプする。そしてこれと同時に、工具側ドローバー用クランパ２２の先端部２２ｂが径方向内側へ移動して工具側ドローバー１４のプルスタッド１４ａをクランプする。これにより、主軸装置への工具５の装着が完了する。 Subsequently, the pressure by the hydraulic cylinder 24 is released, and the first guide cylinder 19 is pressed by the disc spring 23, so that the first guide cylinder 19 and the first guide cylinder 19 are integrated with each other as shown in FIG. The fixed second guide cylinder 20 is moved backward. Thereby, the tool holder clamper 21 and the tool side draw bar clamper 22 slide along the convex portion 20b and the concave portion 20c of the second guide cylinder 20, respectively, and the tip end portion 21b of the tool holder clamper 21 has a diameter. The tool holder 13b is clamped by moving outward in the direction. At the same time, the tip 22b of the tool-side draw bar clamper 22 moves radially inward to clamp the pull stud 14a of the tool-side draw bar 14. This completes the mounting of the tool 5 on the spindle device.
　そして、被加工物に対する加工を行う場合は、例えば主軸装置の移動中に、ドローバー駆動モータ９を駆動し、図４に示すようにドローバー駆動シャフト３、主軸側ドローバー４を介して工具側ドローバー１４を所望の位置（例えば、図５に示す位置）に移動させる。その後、主軸駆動モータ６により主軸２を回転駆動させて加工を開始する。 When machining the workpiece, for example, the draw bar drive motor 9 is driven during the movement of the spindle device, and the tool side draw bar 14 is passed through the draw bar drive shaft 3 and the spindle side draw bar 4 as shown in FIG. Is moved to a desired position (for example, the position shown in FIG. 5). Thereafter, the spindle 2 is rotated by the spindle drive motor 6 to start machining.
　ここで、工具側ドローバー１４は工具側ドローバー用クランパ２２によってクランプされているため、工具側ドローバー１４を後進させたい場合は主軸側ドローバー４を後進させることにより、工具側ドローバー用クランパ２２を介して工具側ドローバー１４を後方へ引くことができる。このように、工具側ドローバー用クランパ２２を備えない場合に、工具５に内蔵したスプリングのみにより工具用ドローバー１４を後方へ押圧するのに対し、本実施例では工具側ドローバー１４を確実に後進させることができ、信頼性を向上させることができる。 Here, since the tool-side draw bar 14 is clamped by the tool-side draw bar clamper 22, when the tool-side draw bar 14 is to be moved backward, the spindle-side draw bar 4 is moved backward to pass through the tool-side draw bar clamper 22. The tool side draw bar 14 can be pulled backward. As described above, when the tool side draw bar clamper 22 is not provided, the tool draw bar 14 is pushed backward only by the spring built in the tool 5, whereas in this embodiment, the tool side draw bar 14 is reliably moved backward. And reliability can be improved.
　さらに、工具５を取り外す際は、ドローバー駆動モータ９を駆動して主軸側ドローバー４及び工具側ドローバー１４を図３に示すクランプ位置に移動させた後、油圧シリンダ２４により第一案内筒１９を押圧し、図２に示すように第一案内筒１９及び第二案内筒２０を前進させる。これにより、工具ホルダ用クランパ２１はその先端部２１ｂが径方向内側に移動して先端部２１ｂの外径が工具ホルダ１３ｂの内径より小さくなる。また、これと同時に工具側ドローバー用クランパ２２はその先端部２２ｂが径方向外側へ移動して先端部２２ｂの内径が工具側ドローバー１４のプルスタッド１４ａの外径より大きくなる。この状態で工具５を主軸２から取り外す。 Further, when removing the tool 5, the draw bar drive motor 9 is driven to move the spindle side draw bar 4 and the tool side draw bar 14 to the clamp positions shown in FIG. Then, the first guide cylinder 19 and the second guide cylinder 20 are advanced as shown in FIG. As a result, the tip 21b of the tool holder clamper 21 moves radially inward, and the outer diameter of the tip 21b becomes smaller than the inner diameter of the tool holder 13b. At the same time, the tool-side drawbar clamper 22 has its tip 22b moved radially outward so that the inner diameter of the tip 22b is larger than the outer diameter of the pull stud 14a of the tool-side drawbar 14. In this state, the tool 5 is removed from the main shaft 2.
　なお、図示はしないが、本実施例に係る工作機械の主軸装置に内部補正機能を備えない通常の工具を適用する場合は、第一案内筒１９及び第二案内筒２０を進退動させ、工具ホルダ用クランパ２１により通常の工具の工具ホルダをクランプ・アンクランプすることにより、上記通常の工具の着脱を行うことができる。 Although not shown, when applying a normal tool that does not have an internal correction function to the spindle device of the machine tool according to the present embodiment, the first guide cylinder 19 and the second guide cylinder 20 are moved forward and backward to move the tool. The normal tool can be attached and detached by clamping and unclamping the tool holder of the normal tool by the holder clamper 21.
　以上のように構成された本実施例に係る主軸装置によれば、第一案内筒１９及び第二案内筒２０を主軸側ドローバー４に対して摺動可能に構成するとともに、油圧シリンダ２４、皿バネ２３によりこの第一案内筒１９及び第二案内筒２０を一体的に進退動させるだけで工具ホルダ用クランパ２１と工具側ドローバー用クランパ２２によりそれぞれ工具ホルダ１３ｂと工具側ドローバー１４を同時にクランプ・アンクランプすることが可能となり、加工に掛かる作業効率を向上させることができる。 According to the spindle apparatus according to the present embodiment configured as described above, the first guide cylinder 19 and the second guide cylinder 20 are configured to be slidable with respect to the spindle-side drawbar 4, and the hydraulic cylinder 24, the dish By simply moving the first guide cylinder 19 and the second guide cylinder 20 forward and backward by the spring 23, the tool holder 13b and the tool side draw bar 14 are simultaneously clamped by the tool holder clamp 21 and the tool side draw bar clamp 22 respectively. Unclamping is possible, and the working efficiency required for processing can be improved.
　また、クランプ機構１８を、図５及び図６に示した工具側ドローバー１４を内蔵し、この工具側ドローバー１４の進退動によってバイト１５の切削径を調整することができる工具５のような、刃先の位置を調整可能に構成された内部補正機能を備える工具と、自動工具交換機能を備える工作機械に適用される通常工具の両方をクランプ・アンクランプすることが可能な構成としたので、特殊工具と通常工具とを共通の工作機械で併用することができ、汎用性が向上する。さらに、上述した工具５の刃先の位置を調整する補正動作を自動工具交換に係る主軸装置の移動中に行うことができるため、補正動作のみのための専用の時間が発生せず、サイクルタイムが延びることを防止して、工作機械における加工を高能率に行うことが可能となる。 Further, the clamping mechanism 18 includes the tool-side draw bar 14 shown in FIGS. 5 and 6, and the cutting edge of the tool 5 such as the tool 5 that can adjust the cutting diameter of the cutting tool 15 by the forward and backward movement of the tool-side draw bar 14. The special tool has a configuration that can clamp and unclamp both a tool with an internal compensation function that can adjust the position of the tool and a normal tool that is applied to a machine tool with an automatic tool change function. And normal tools can be used together on a common machine tool, improving versatility. Furthermore, since the correction operation for adjusting the position of the cutting edge of the tool 5 described above can be performed during the movement of the spindle device related to automatic tool change, a dedicated time for only the correction operation does not occur, and the cycle time is reduced. It is possible to prevent the extension and perform machining in the machine tool with high efficiency.
　このように、本実施例に係る主軸装置によれば、高精度、高信頼性加工と、汎用性とを両立することが可能となる。 Thus, according to the spindle device according to the present embodiment, it is possible to achieve both high-precision and high-reliability machining and versatility.
　なお、上述した実施例では、第一案内筒１９と第二案内筒２０とを別部材として説明したが、これらは一体であっても構わない。また、図５に示した工具５は一例であり、工具側ドローバーを備え、この工具側ドローバーの進退動に応じて刃先の位置を調整（例えば、刃先の位置を軸方向に移動させる等）可能に構成された工具であれば、本発明に係る工作機械の主軸装置を適用可能であることはいうまでもない。 In the above-described embodiment, the first guide cylinder 19 and the second guide cylinder 20 are described as separate members, but they may be integrated. Further, the tool 5 shown in FIG. 5 is an example and includes a tool-side draw bar, and the position of the blade edge can be adjusted according to the forward and backward movement of the tool-side draw bar (for example, the position of the blade edge can be moved in the axial direction). Needless to say, the spindle device of the machine tool according to the present invention can be applied to the tool configured as described above.
　また、上述した実施例において示した第二案内筒２０、工具ホルダ用クランパ２１、工具側ドローバー用クランパ２２の形状は一例であり、第一案内筒１９及び第二案内筒２０を進退動させることにより、工具ホルダ用クランパ２１、工具側ドローバー用クランパ２２によって工具ホルダ１３ｂ、工具側ドローバー１４を同時にクランプ・アンクランプできるような形状とすればよいことはいうまでもない。 Further, the shapes of the second guide cylinder 20, the tool holder clamper 21, and the tool side draw bar clamper 22 shown in the above-described embodiment are merely examples, and the first guide cylinder 19 and the second guide cylinder 20 are moved forward and backward. Thus, it goes without saying that the tool holder 13b and the tool side draw bar 14 may be simultaneously clamped and unclamped by the tool holder clamper 21 and the tool side draw bar clamper 22.
　本発明は、自動工具交換機能を備える工作機械の主軸装置に適用可能であって、特に、工具がその軸線上に設けられた軸体によって刃先の位置を調整可能に構成された内部補正機能を備えた工具を自動交換可能に構成された主軸装置に適用して好適なものである。 The present invention is applicable to a spindle device of a machine tool having an automatic tool change function, and in particular, has an internal correction function configured such that the position of the blade edge can be adjusted by a shaft body provided on the axis line of the tool. The tool provided is suitable for application to a spindle device configured to be automatically replaceable.
　１　ハウジング
　２　主軸
　２ａ　軸孔
　２ｂ　内周面
　３　ドローバー駆動シャフト
　４　主軸側ドローバー
　５　工具
　６　主軸駆動モータ
　９　ドローバー駆動モータ
　１４　工具側ドローバー
　１８　クランプ機構
　１９　移動筒
　１９ａ　軸孔
　２０　案内筒
　２０ａ　軸孔
　２０ｂ　凸状部
　２０ｃ　凹状部
　２１　工具ホルダ用クランパ
　２１ａ　工具ホルダ用クランパの基端部
　２１ｂ　工具ホルダ用クランパの先端部
　２２　工具側ドローバー用クランパ
　２２ａ　工具側ドローバー用クランパの基端部
　２２ｂ　工具側ドローバー用クランパの先端部
　２３　皿バネ
　２４　油圧シリンダ
　２５，２６　バネ
　２７　空隙 DESCRIPTION OF SYMBOLS 1 Housing 2 Main shaft 2a Shaft hole 2b Inner peripheral surface 3 Draw bar drive shaft 4 Main shaft side draw bar 5 Tool 6 Main shaft drive motor 9 Draw bar drive motor 14 Tool side draw bar 18 Clamp mechanism 19 Moving cylinder 19a Shaft hole 20 Guide cylinder 20a Shaft hole 20b Convex 20c Recessed portion 21 Tool holder clamper 21a Tool holder clamper base end 21b Tool holder clamper tip 22 Tool side drawbar clamper 22a Tool side drawbar clamper base end 22b Tool side drawbar clamper Tip 23 Disc spring 24 Hydraulic cylinder 25, 26 Spring 27 Air gap

Claims (5)

  1. 　自動工具交換機能を備え、ハウジングに回転可能に支持されて第一の駆動手段により回転駆動される主軸と、前記主軸の軸線上に形成された軸孔に進退動可能に挿通され、第二の駆動手段により進退動を行う主軸側補正軸とを備えた主軸装置において、
    　前記主軸の軸孔に挿通されるとともに、前記主軸側補正軸を軸線上に形成された軸孔に挿通し、第三の駆動手段により進退動を行う案内部材と、
    　一端が前記主軸の内周面に係止され他端が前記案内部材の外周面に沿って摺動可能に構成された第一拘束部材と、
    　一端が前記主軸側補正軸の先端部に係止され他端が前記案内部材の内周面に沿って摺動可能に構成された第二拘束部材とを備え、
    　前記案内部材の進退動に応じ、前記第一拘束部材の他端が前記案内部材の外周面に形成された凸状部に沿って拡径・縮径されることにより前記主軸の先端に装着される工具の工具ホルダに対する拘束・開放を行う一方、前記第二拘束部材の他端が前記案内部材の内周面に形成された凹状部に沿って縮径・拡径されることにより前記工具に内蔵される工具側補正軸に対する拘束・開放を行うように構成された
    　ことを特徴とする工作機械の主軸装置。     It has an automatic tool change function, is inserted into a main shaft that is rotatably supported by the housing and is driven to rotate by the first driving means, and a shaft hole formed on the axis of the main shaft so as to be able to move forward and backward. In the spindle device provided with the spindle side correction axis that moves forward and backward by the drive means,
    A guide member that is inserted into the shaft hole of the main shaft, and the main shaft side correction shaft is inserted into a shaft hole formed on the axis, and is advanced and retracted by a third driving means;
    A first restraining member having one end locked to the inner peripheral surface of the main shaft and the other end slidable along the outer peripheral surface of the guide member;
    A second restraining member having one end locked to the tip of the main shaft side correction shaft and the other end configured to be slidable along the inner peripheral surface of the guide member;
    As the guide member advances and retracts, the other end of the first restraining member is attached to the tip of the main shaft by being enlarged or reduced in diameter along a convex portion formed on the outer peripheral surface of the guide member. The tool is restrained / released with respect to the tool holder, while the other end of the second restraining member is contracted / expanded along the concave portion formed on the inner peripheral surface of the guide member. A spindle device for a machine tool, characterized in that it is configured to constrain and release the built-in tool side compensation axis.
  2. 　前記第一拘束部材は、前記他端に、当該他端が前記案内部材の進退動によって拡径された際に前記工具ホルダの先端に形成された厚肉部に係合して前記厚肉部を係止する係止部を有し、
    　前記第二拘束部材は、前記他端側に、当該他端が前記案内部材の進退動によって縮径された際に前記工具側補正軸のプルスタッドに係合して前記プルスタッドを係止する係止部を有する
    　ことを特徴とする請求項１記載の工作機械の主軸装置。     The first restraining member engages with the thick part formed at the tip of the tool holder when the other end is expanded in diameter by the forward and backward movement of the guide member. Having a locking part for locking,
    The second restraining member engages with the pull stud of the tool side correction shaft by engaging with the pull stud of the tool side correction shaft when the other end is reduced in diameter by the forward and backward movement of the guide member. The spindle device for a machine tool according to claim 1, further comprising a locking portion.
  3. 　前記第三の駆動手段は、前記案内部材を前方へ押圧する押圧手段と、前記案内部材を後方へ付勢する皿バネとから構成された
    　ことを特徴とする請求項１又は請求項２記載の工作機械の主軸装置。     The said 3rd drive means was comprised from the press means which presses the said guide member forward, and the disk spring which urges | biases the said guide member back. The claim 1 or Claim 2 characterized by the above-mentioned. Machine tool spindle device.
  4. 　前記案内筒は、前記第三の駆動手段による前記案内部材の進退動のみにより、前記第一拘束部材及び前記第二拘束部材による前記工具ホルダ及び前記工具側補正軸の拘束・開放を行うように前記凸状部及び前記凹状部の形状を設定された
    　ことを特徴とする請求項１又は請求項２記載の工作機械の主軸装置。     The guide cylinder restrains / releases the tool holder and the tool side correction shaft by the first restraining member and the second restraining member only by advancing and retracting the guide member by the third driving means. The spindle device of the machine tool according to claim 1 or 2, wherein the shape of the convex portion and the concave portion is set.
  5. 　前記第一拘束部材は、自動工具交換機能を有する工作機械に適用される通常工具の工具ホルダに対する拘束・開放を可能に構成された
    　ことを特徴とする請求項４記載の工作機械の主軸装置。     The spindle device for a machine tool according to claim 4, wherein the first restraining member is configured to be capable of restraining and releasing a normal tool applied to a machine tool having an automatic tool change function.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2301699A1 (en) * 2009-09-29 2011-03-30 Ortlieb Präzisions-Spannzeuge GmbH + Co. Tool chucking device for a tool holder with central adjustment bolt
CN102950496A (en) * 2011-08-17 2013-03-06 发得科技工业股份有限公司 Broach broaching mechanism
CN102950496B (en) * 2011-08-17 2015-09-16 发得科技工业股份有限公司 The tool-broaching mechanism of cutter
JP2014217944A (en) * 2013-05-02 2014-11-20 アルティス ゲーエムベーハーＡＲＴＩＳ ＧｍｂＨ Method and apparatus for adjusting adjustable tools clamped on motor spindle of machine tool
EP2799169A3 (en) * 2013-05-02 2015-08-05 ARTIS GmbH Method and device for adjusting adjustable tools mounted on a motor spindle of a machine tool
JP2017104974A (en) * 2015-12-07 2017-06-15 オット−ヤコブ シュパンテヒニック ゲーエムベーハー Clamp assembly and clamp device equipped with clamp assembly
ITUB20156914A1 (en) * 2015-12-11 2017-06-11 Walvoil Spa EXPANSION TOOL WITH A MANDREL COUPLING TOOL MACHINE AND TOOL MACHINE
US11033971B2 (en) 2017-05-09 2021-06-15 Schaublin Sa Clamping device for holding a collet

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