WO2020138229A1 - Tool holder - Google Patents

Tool holder Download PDF

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Publication number
WO2020138229A1
WO2020138229A1 PCT/JP2019/050996 JP2019050996W WO2020138229A1 WO 2020138229 A1 WO2020138229 A1 WO 2020138229A1 JP 2019050996 W JP2019050996 W JP 2019050996W WO 2020138229 A1 WO2020138229 A1 WO 2020138229A1
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WO
WIPO (PCT)
Prior art keywords
tool
tool holder
central axis
spindle
holder
Prior art date
Application number
PCT/JP2019/050996
Other languages
French (fr)
Japanese (ja)
Inventor
英史 玉川
Original Assignee
株式会社牧野フライス製作所
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Filing date
Publication date
Application filed by 株式会社牧野フライス製作所 filed Critical 株式会社牧野フライス製作所
Publication of WO2020138229A1 publication Critical patent/WO2020138229A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/117—Retention by friction only, e.g. using springs, resilient sleeves, tapers
    • B23B31/1179—Retention by friction only, e.g. using springs, resilient sleeves, tapers using heating and cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
    • B23Q11/1023—Tool holders, or tools in general specially adapted for receiving the cutting liquid from the spindle
    • 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
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%

Definitions

  • the present invention relates to a tool holder that holds a tool mounted on a spindle of a machine tool.
  • a workpiece is attached to the table, and the spindle is rotated and moved relative to the workpiece, the rotary tool is attached to the spindle using a tool holder. I have to.
  • Patent Document 1 a weight member having a natural frequency different from that of the tool holder is housed in the hollow portion of the tool holder, and a spring member is arranged between the peripheral wall surface of the hollow portion and the outer peripheral surface of the weight member to prevent vibration. A tool holder that prevents the occurrence is described.
  • the tool holder disclosed in Patent Document 1 has a problem that the effect of suppressing vibration during cutting is small. Further, in order to adjust the natural frequency of the tool holder, it is difficult to adjust the natural frequency because it is necessary to adjust many parameters such as the weight and shape of the weight member and the spring constant of the spring member. There's a problem.
  • the present invention has a technical problem to solve the problems of the conventional techniques, and an object thereof is to provide a tool holder having a higher vibration suppressing effect.
  • a tool holder gripping portion gripped by the spindle by a clamp mechanism of the spindle of the machine tool.
  • a tool holder including at least one spiral groove formed in a boss portion so as to spirally extend around a center axis of the tool holder around a tool mounting hole.
  • the tool holder gripping portion and the boss portion are integrally formed, and the spiral groove is formed in the boss portion, whereby a tool holder having a high vibration suppressing effect is provided.
  • the tool holder of the present invention since the tool holder of the present invention has the tool holder gripping portion and the boss portion integrally formed, it can be integrally manufactured by a three-dimensional printer. Therefore, an analysis method such as a finite element method can be used. It is easy to obtain the natural frequency in advance by using, and the vibration suppression effect can be further enhanced by various simulations while changing the shape and number of spiral grooves and the angular range of the spiral around the center axis of the tool holder. It is possible to provide a tool holder.
  • the tool holder of the present invention can be manufactured by a three-dimensional printer in the shape of a two-face restraint type tool holder (HSK holder) or a BT shank tool holder having a pull stud, it can be used as an existing tool magazine. It can be used in machine tools such as machining centers equipped with a tool changer.
  • FIG. 3 is a vertical sectional view of a tool holder according to a preferred embodiment of the present invention. It is the end view which looked at the tool holder of FIG. 1 from the boss part side.
  • FIG. 3 is a sectional view taken along the line III-III in FIG. 1. It is a side view of the tool holder of FIG. 1 shown in the state which mounted the tool.
  • FIG. 2 is an end view of the tool holder of FIG. 1 shown with a tool attached. It is a schematic diagram of a machine tool which can use a tool holder of the present invention.
  • the machine tool 100 constitutes a horizontal machining center, and includes a tool magazine 120 for storing a plurality of tools T, one of the tools T stored in the tool magazine 120, and a tip of a spindle 108 of the machine tool 100.
  • a tool changing device 140 for changing the attached tool T is provided.
  • the machine tool 100, the tool magazine 120, and the tool changer 140 are surrounded by a cover 130.
  • the tool T is a rotary tool such as an end mill, but is simply referred to as the tool T in this specification.
  • the cover 130 includes a partition wall 132 that divides the inside into a processing chamber 134 and a tool storage chamber 136.
  • the machine tool 100 is arranged in a machining chamber 134 for machining a workpiece, and the tool magazine 120 and the tool changing device 140 are arranged in a tool storage chamber 136.
  • An opening 132a for moving a tool between the processing chamber 134 and the tool storage chamber 136 is formed in the partition wall 132, and a shutter 132b for opening and closing the opening 132a is arranged in the partition wall 132. ing.
  • the tool magazine 120 includes a disk-shaped base member 122.
  • the base member 122 has a receiving portion 124 formed of a plurality of recesses that are open outward in the radial direction and are arranged at equal angular intervals in the circumferential direction. The tool is retained.
  • the tool changing device 140 is arranged between the tool magazine 120 and the machine tool 100, and includes a changing arm 142 and a shifter 144.
  • Grippers 142a and 142b for holding tools are provided at both ends of the exchange arm 142.
  • the exchange arm 142 is capable of linear movement that advances and retracts in the direction of the rotation axis of the main shaft 108 and rotation movement that rotates 90° or 180° within a plane (vertical plane) perpendicular to the rotation axis of the main shaft 108. There is.
  • the shifter 144 is provided so as to be horizontally reciprocable between the tool magazine 120 and the replacement arm 142.
  • the shifter 144 receives the tool at the standby position 121 of the tool magazine 120 from the tool magazine 120 and transfers the tool to the tool transfer position 146.
  • the shifter 144 receives the tool from the exchange arm 142 at the tool transfer position 146 and mounts the tool on the receiving portion 124 of the tool magazine 120 arranged at the standby position 121.
  • a tool holder 10 has a hollow taper portion 12, a flange portion 14 and a boss portion 18 as a tool holder gripping portion.
  • the taper portion 12 is mounted in a taper hole (not shown) formed in the main shaft 108 of the machine tool. More specifically, in the main shaft 108, a plurality of collets (not shown), a draw bar (not shown) connected to the plurality of collets, and the draw bar in the front-back direction along the central axis of the main shaft.
  • a clamp mechanism having a driving disc spring (not shown) is provided.
  • a plurality of collets of the clamp mechanism are arranged in the hollow portion 12a of the tapered portion 12, and the tapered portion 12 is pressed from the inner surface 12b of the hollow portion 12a to the inner surface 12b of the tapered hole, so that the tapered portion 12 becomes the main shaft 108 of the machine tool. Is gripped by.
  • the tool holder 10 is a two-face constraint type tool holder (HSK holder), but it may be a BT shank tool holder having pull studs (not shown).
  • the clamp mechanism includes a draw bar (not shown) detachably provided on the pull stud and a disc spring (not shown) that drives the draw bar in the front-rear direction along the rotation axis of the main shaft 108. I have it.
  • the flange portion 14 has an abutting surface 14 a that abuts the end surface of the main shaft 108 of the machine tool 100, and a circumferential groove 16 formed on the outer peripheral surface of the flange portion 14.
  • the circumferential groove 16 is engageable with the receiving portion 124 of the tool magazine and the grippers 142a and 142b of the exchange arm 142.
  • the boss portion 18 projects from the flange portion 14 along the central axis O of the tool holder 10 to the opposite side (tip end side) of the tapered portion 12.
  • a tool mounting hole 20 is formed in the boss portion 18 along the central axis O.
  • the shank portion of the tool T is inserted into the tool mounting hole 20.
  • a collet chuck (not shown) that holds the shank portion of the tool T may be incorporated in the tool mounting hole 20.
  • spiral groove Between the outer peripheral surface 18a of the boss portion 18 and the inner peripheral surface 20a of the tool mounting hole 20, at least one, in this example, two spiral or spiral grooves 24, 26 (hereinafter, spiral groove) are provided. 24 and 26) are formed.
  • the number of spiral grooves 24, 26 and the angular range (the number of turns) of the spiral grooves 24, 26 around the central axis O are not limited to this, and are appropriately determined through experiments or the like so that the vibration is small or eliminated. can do.
  • spiral grooves 24 and 26 are formed in the shape of Archimedes' spiral (algebraic spiral), but may be formed in the shape of Bernoulli's spiral (logarithmic spiral). Furthermore, the spiral grooves 24, 26 may be formed so as to extend along the involute curve.
  • the tool holder 10 is also formed with an axial passage 28 extending along the central axis O.
  • the tool mounting hole 20 communicates with the hollow portion 12 a of the tapered portion 12 by the axial passage 28.
  • the tool holder 10 is further formed with a plurality of radial passages 30.
  • the radial passage 30 extends radially across the portion of the spiral grooves 24, 26 adjacent the bottom. The radial passage 30 allows the spiral grooves 24, 26 to communicate with the axial passage 28.
  • the region in which the spiral grooves 24 and 26 are formed is rigid, particularly in the radial direction.
  • the rigidity becomes low, and the tool T is elastically supported in the radial direction inside the spiral grooves 24 and 26 together with the area outside the tool mounting hole 20.
  • the area inside the two-dot chain line circle 22 is called the tool gripping portion, and the area outside the circle 22 is called the supporting portion.
  • the circle 22 can be the largest circle that contacts the spiral grooves 24, 26 without intersecting the spiral grooves 24, 26.
  • the tool holder 10 including the tool T including the tool T is compared with the case where the spiral grooves 24 and 26 are not provided.
  • the natural frequency can be lowered.
  • the natural frequency can be adjusted by changing the number, shape, groove width, and angular range (number of turns) of the spiral grooves 24, 26 about the central axis O.
  • the shape of the spiral grooves 24, 26 is preferably symmetrical with respect to the central axis O of the tool holder 10. Further, by elastically supporting the tool T, it is possible to eliminate or reduce the vibration transmitted from the machine tool 100 side to the tool T through the spindle 108.
  • the tool holder 10 has, for example, the tapered portion 12 as the tool holder gripping portion and the boss portion 18 formed integrally, it can be manufactured from a material such as SUS316 or maraging steel using a three-dimensional printer. Further, in the present invention, the tool holder 10 does not necessarily have to include the flange portion 14, and the tapered portion 12 as the tool holder gripping portion and the boss portion 18 may be formed adjacently and integrally.
  • Tool Holder 12 Tapered Part 12a Inner Surface 12a Hollow Part 12b Inner Surface 14 Flange Part 14a Abutment Surface 16 Circumferential Groove 18 Boss 18a Outer Surface 20 Tool Mounting Hole 20a Inner Surface 22 Circle 24 Vortex Groove 26 Vortex Groove 28 Axial Passage 30 Radial passage 100 Machine tool 108 Spindle 120 Tool magazine 121 Standby position 122 Base member 124 Receptor 130 Cover 132 Partition wall 132a Opening 132b Shutter 134 Processing chamber 136 Tool storage chamber 140 Tool changing device 142 Exchange arm 142a Gripper 142b Gripper 144 Shifter 146 Tool transfer position

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Abstract

A tool holder (10) which is for gripping a tool (T) that is attached to a main spindle (108) of a machine tool (100) has: a tool holder gripping part (12) that is held, by a clamp mechanism of the main spindle of the machine tool, to the main spindle; a boss part (18) which is integrally formed with the tool holder gripping part, along a central axis line (O) of the tool holder, on the leading end side relative to the tool holder gripping part; a tool attachment hole (20) which is formed in the boss part along the central axis line of the tool holder; and at least one spiral groove (24, 26) which is formed in the boss part so as to extend, around the tool attachment hole, in such a manner as to spiral about the central axis line of the tool holder.

Description

工具ホルダTool holder
　本発明は、工作機械の主軸に装着される工具を把持する工具ホルダに関する。 The present invention relates to a tool holder that holds a tool mounted on a spindle of a machine tool.
　回転工具を主軸に取り付け、テーブルにワークを取り付けて、主軸を回転させつつワークに対して相対移動させ、ワークを加工するタイプの工作機械では、工具ホルダを用いて回転工具を主軸に装着するようにしている。 In a machine tool of the type in which a rotary tool is attached to the spindle, a workpiece is attached to the table, and the spindle is rotated and moved relative to the workpiece, the rotary tool is attached to the spindle using a tool holder. I have to.
　近時、工作機械の分野では主軸の高速化が進められている一方で、高い加工精度が要求されるようになっている。主軸の高速化に伴い、特に高周波数領域で、加工中に共振によるびびり振動のような振動が発生することがある。 ⇒ Recently, in the field of machine tools, while the spindle speed has been increased, high machining accuracy is required. As the spindle speed increases, vibration such as chatter vibration due to resonance may occur during machining, especially in a high frequency range.
　特許文献１には、工具ホルダの中空部内に工具ホルダとは固有振動数が異なる錘部材を収容し、中空部の周壁面と錘部材外周面との間にばね部材を配置して、振動の発生を防止した工具ホルダが記載されている。 In Patent Document 1, a weight member having a natural frequency different from that of the tool holder is housed in the hollow portion of the tool holder, and a spring member is arranged between the peripheral wall surface of the hollow portion and the outer peripheral surface of the weight member to prevent vibration. A tool holder that prevents the occurrence is described.
特開２００７－２９００４７号公報JP, 2007-290047, A
　特許文献１の工具ホルダでは、切削加工中の振動を抑制する効果が小さい問題がある。また、工具ホルダの固有振動数を調節するために、錘部材の重量や形状、また、ばね部材のばね定数のように多くのパラメータを調整する必要があることから、固有振動数の調節がむずかしい問題がある。
　本発明は、こうした従来技術の問題を解決することを技術課題としており、振動の抑制効果が一層高い工具ホルダを提供することを目的としている。 The tool holder disclosed in Patent Document 1 has a problem that the effect of suppressing vibration during cutting is small. Further, in order to adjust the natural frequency of the tool holder, it is difficult to adjust the natural frequency because it is necessary to adjust many parameters such as the weight and shape of the weight member and the spring constant of the spring member. There's a problem.
The present invention has a technical problem to solve the problems of the conventional techniques, and an object thereof is to provide a tool holder having a higher vibration suppressing effect.
　上述の目的を達成するために、本発明によれば、工作機械の主軸に装着される工具を把持する工具ホルダにおいて、工作機械の主軸のクランプ機構で該主軸に把持される工具ホルダ把持部と、工具ホルダの中心軸線に沿って工具ホルダ把持部より先端側に工具ホルダ把持部と一体で形成されたボス部と、工具ホルダの中心軸線に沿ってボス部に形成された工具装着穴と、工具装着穴の周囲に工具ホルダの中心軸線を中心として渦巻き状に延びるようにボス部に形成された少なくとも１本の渦巻溝とを具備する工具ホルダが提供される。 To achieve the above object, according to the present invention, in a tool holder for gripping a tool mounted on a spindle of a machine tool, a tool holder gripping portion gripped by the spindle by a clamp mechanism of the spindle of the machine tool. A boss portion integrally formed with the tool holder gripping portion on the tip side of the tool holder gripping portion along the central axis line of the tool holder, and a tool mounting hole formed in the boss portion along the central axis line of the tool holder, There is provided a tool holder including at least one spiral groove formed in a boss portion so as to spirally extend around a center axis of the tool holder around a tool mounting hole.
　本発明によれば、工具ホルダ把持部とボス部とを一体に形成し、ボス部に渦巻溝を形成することによって、振動抑制効果の高い工具ホルダが提供される。また、本発明の工具ホルダは、工具ホルダ把持部とボス部とを一体に形成されているので、三次元プリンタにより一体的に製作することが可能であるので、有限要素法のような解析手法によって事前に固有振動数を求めることが容易であり、渦巻溝の形状や本数、工具ホルダの中心軸線を中心とした螺旋の角度範囲等を種々に変更しながらシミュレーションによって、振動抑制効果の一層高い工具ホルダを提供することが可能となる。また、本発明の工具ホルダは、二面拘束型の工具ホルダ（HSKホルダ）や、プルスタッドを有したBTシャンク工具ホルダの形状に三次元プリンタにより製作することができるので、既存の工具マガジンと工具交換装置とを備えたマシニングセンタのような工作機械で利用可能である。 According to the present invention, the tool holder gripping portion and the boss portion are integrally formed, and the spiral groove is formed in the boss portion, whereby a tool holder having a high vibration suppressing effect is provided. In addition, since the tool holder of the present invention has the tool holder gripping portion and the boss portion integrally formed, it can be integrally manufactured by a three-dimensional printer. Therefore, an analysis method such as a finite element method can be used. It is easy to obtain the natural frequency in advance by using, and the vibration suppression effect can be further enhanced by various simulations while changing the shape and number of spiral grooves and the angular range of the spiral around the center axis of the tool holder. It is possible to provide a tool holder. Further, since the tool holder of the present invention can be manufactured by a three-dimensional printer in the shape of a two-face restraint type tool holder (HSK holder) or a BT shank tool holder having a pull stud, it can be used as an existing tool magazine. It can be used in machine tools such as machining centers equipped with a tool changer.
本発明の好ましい実施形態による工具ホルダの縦断面図である。FIG. 3 is a vertical sectional view of a tool holder according to a preferred embodiment of the present invention. 図１の工具ホルダをボス部側から見た端面図である。It is the end view which looked at the tool holder of FIG. 1 from the boss part side. 図１において、矢視線III-IIIに沿う断面図である。FIG. 3 is a sectional view taken along the line III-III in FIG. 1. 工具を装着した状態で示す図１の工具ホルダの側面図である。It is a side view of the tool holder of FIG. 1 shown in the state which mounted the tool. 工具を装着した状態で示す図１の工具ホルダの端面図である。FIG. 2 is an end view of the tool holder of FIG. 1 shown with a tool attached. 本発明の工具ホルダを利用可能な工作機械の略示図である。It is a schematic diagram of a machine tool which can use a tool holder of the present invention.
　以下、添付図面を参照して、本発明の好ましい実施形態を説明する。先ず、図６を参照して、本発明の工具ホルダを利用可能な工作機械の一例を説明する。
　図６において、工作機械１００は横形マシニングセンタを構成しており、複数の工具Ｔを収納する工具マガジン１２０と、工具マガジン１２０に収納された工具Ｔの１つと、工作機械１００の主軸１０８の先端に装着された工具Ｔとを交換する工具交換装置１４０を備える。工作機械１００、工具マガジン１２０および工具交換装置１４０はカバー１３０によって包囲されている。工具Ｔはエンドミルのような回転工具であるが、本明細書では単に工具Ｔと記載する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, an example of a machine tool that can use the tool holder of the present invention will be described with reference to FIG.
In FIG. 6, the machine tool 100 constitutes a horizontal machining center, and includes a tool magazine 120 for storing a plurality of tools T, one of the tools T stored in the tool magazine 120, and a tip of a spindle 108 of the machine tool 100. A tool changing device 140 for changing the attached tool T is provided. The machine tool 100, the tool magazine 120, and the tool changer 140 are surrounded by a cover 130. The tool T is a rotary tool such as an end mill, but is simply referred to as the tool T in this specification.
　カバー１３０は、その内部を加工室１３４と工具収納室１３６とに分割する隔壁１３２を具備している。工作機械１００は、ワークを加工する加工室１３４内に配置され、工具マガジン１２０および工具交換装置１４０は工具収納室１３６内に配置される。隔壁１３２には、加工室１３４と工具収納室１３６との間で工具を移動するための開口部１３２ａが形成されており、隔壁１３２には、開口部１３２ａを開閉するためのシャッタ１３２ｂが配置されている。 The cover 130 includes a partition wall 132 that divides the inside into a processing chamber 134 and a tool storage chamber 136. The machine tool 100 is arranged in a machining chamber 134 for machining a workpiece, and the tool magazine 120 and the tool changing device 140 are arranged in a tool storage chamber 136. An opening 132a for moving a tool between the processing chamber 134 and the tool storage chamber 136 is formed in the partition wall 132, and a shutter 132b for opening and closing the opening 132a is arranged in the partition wall 132. ing.
　工具マガジン１２０は円板状に形成されたベース部材１２２を具備している。ベース部材１２２は、半径方向外方に開口し周方向に等角度間隔で配設された複数の凹部からなる受容部１２４を有しており、該受容部１２４の各々に工具ホルダ１０を介して工具が保持される。 The tool magazine 120 includes a disk-shaped base member 122. The base member 122 has a receiving portion 124 formed of a plurality of recesses that are open outward in the radial direction and are arranged at equal angular intervals in the circumferential direction. The tool is retained.
　工具交換装置１４０は、工具マガジン１２０と工作機械１００との間に配設され、交換アーム１４２と、シフタ１４４とを具備している。交換アーム１４２の両端には工具を把持するグリッパ１４２ａ、１４２ｂが設けられている。交換アーム１４２は、主軸１０８の回転軸線の方向に進退する直線動作と、主軸１０８の回転軸線に対して垂直な平面（鉛直平面）内で９０°または１８０°回転する回転動作が可能となっている。 The tool changing device 140 is arranged between the tool magazine 120 and the machine tool 100, and includes a changing arm 142 and a shifter 144. Grippers 142a and 142b for holding tools are provided at both ends of the exchange arm 142. The exchange arm 142 is capable of linear movement that advances and retracts in the direction of the rotation axis of the main shaft 108 and rotation movement that rotates 90° or 180° within a plane (vertical plane) perpendicular to the rotation axis of the main shaft 108. There is.
　シフタ１４４は、工具マガジン１２０と交換アーム１４２との間で水平方向に往復動可能に設けられている。シフタ１４４は、工具マガジン１２０の待機位置１２１にある工具を工具マガジン１２０から受け取り、該工具を工具授受位置１４６へ移送する。また、シフタ１４４は、反対に、工具授受位置１４６において交換アーム１４２から工具を受け取り、該工具を待機位置１２１に配置されている工具マガジン１２０の受容部１２４に装着する。 The shifter 144 is provided so as to be horizontally reciprocable between the tool magazine 120 and the replacement arm 142. The shifter 144 receives the tool at the standby position 121 of the tool magazine 120 from the tool magazine 120 and transfers the tool to the tool transfer position 146. On the contrary, the shifter 144 receives the tool from the exchange arm 142 at the tool transfer position 146 and mounts the tool on the receiving portion 124 of the tool magazine 120 arranged at the standby position 121.
　図１～図３において、本発明の好ましい実施形態による工具ホルダ１０は、工具ホルダ把持部として中空のテーパ部１２、フランジ部１４およびボス部１８を有している。テーパ部１２は、工作機械の主軸１０８に形成されたテーパ穴（図示せず）に装着される。より詳細には、主軸１０８内には、複数のコレット（図示せず）と、該複数のコレットに連結されたドローバー（図示せず）と、該ドローバーを主軸の中心軸線に沿って前後方向に駆動する皿ばね（図示せず）を有したクランプ機構が配設されている。クランプ機構の複数のコレットがテーパ部１２の中空部１２ａ内に配置され、中空部１２ａの内面１２ｂからテーパ部１２をテーパ穴の内面１２ｂに押圧することによって、テーパ部１２が工作機械の主軸１０８に把持される。 1 to 3, a tool holder 10 according to a preferred embodiment of the present invention has a hollow taper portion 12, a flange portion 14 and a boss portion 18 as a tool holder gripping portion. The taper portion 12 is mounted in a taper hole (not shown) formed in the main shaft 108 of the machine tool. More specifically, in the main shaft 108, a plurality of collets (not shown), a draw bar (not shown) connected to the plurality of collets, and the draw bar in the front-back direction along the central axis of the main shaft. A clamp mechanism having a driving disc spring (not shown) is provided. A plurality of collets of the clamp mechanism are arranged in the hollow portion 12a of the tapered portion 12, and the tapered portion 12 is pressed from the inner surface 12b of the hollow portion 12a to the inner surface 12b of the tapered hole, so that the tapered portion 12 becomes the main shaft 108 of the machine tool. Is gripped by.
　なお、本例では、工具ホルダ１０は、二面拘束型の工具ホルダ（HSKホルダ）であるが、プルスタッド（図示せず）を有したBTシャンク工具ホルダであってもよい。その場合、クランプ機構は、プルスタッドに係脱可能に設けられたドローバー（図示せず）と、該ドローバーを主軸１０８の回転軸線に沿って前後方向に駆動する皿ばね（図示せず）とを備えている。 In this example, the tool holder 10 is a two-face constraint type tool holder (HSK holder), but it may be a BT shank tool holder having pull studs (not shown). In that case, the clamp mechanism includes a draw bar (not shown) detachably provided on the pull stud and a disc spring (not shown) that drives the draw bar in the front-rear direction along the rotation axis of the main shaft 108. I have it.
　フランジ部１４は、工作機械１００の主軸１０８の端面に当接する当接面１４ａと、フランジ部１４の外周面に形成された周溝１６を有している。周溝１６は工具マガジンの受容部１２４および交換アーム１４２のグリッパ１４２ａ、１４２ｂと係合可能となっている。 The flange portion 14 has an abutting surface 14 a that abuts the end surface of the main shaft 108 of the machine tool 100, and a circumferential groove 16 formed on the outer peripheral surface of the flange portion 14. The circumferential groove 16 is engageable with the receiving portion 124 of the tool magazine and the grippers 142a and 142b of the exchange arm 142.
　ボス部１８は、工具ホルダ１０の中心軸線Ｏに沿ってフランジ部１４からテーパ部１２の反対側（先端側）に突出している。ボス部１８には、中心軸線Ｏに沿って工具装着穴２０が形成されている。工具装着穴２０に工具Ｔのシャンク部が挿入される。例えば、工具ホルダ１０のボス部を加熱して工具装着穴２０を広げ、工具Ｔのシャンク部を挿入して、工具ホルダ１０を冷却することによって、焼き嵌め式に工具Ｔを工具ホルダ１０に装着することができる。或いは、工具装着穴２０内に、工具Ｔのシャンク部を把持するコレットチャック（図示せず）を組み込んでもよい。 The boss portion 18 projects from the flange portion 14 along the central axis O of the tool holder 10 to the opposite side (tip end side) of the tapered portion 12. A tool mounting hole 20 is formed in the boss portion 18 along the central axis O. The shank portion of the tool T is inserted into the tool mounting hole 20. For example, by heating the boss portion of the tool holder 10 to widen the tool mounting hole 20, inserting the shank portion of the tool T, and cooling the tool holder 10, the tool T is mounted on the tool holder 10 in a shrink fit manner. can do. Alternatively, a collet chuck (not shown) that holds the shank portion of the tool T may be incorporated in the tool mounting hole 20.
　ボス部１８の外周面１８ａと、工具装着穴２０の内周面２０ａとの間には、少なくとも１本の、本例では２本の渦巻き形または螺旋状の溝２４、２６（以下、渦巻溝２４、２６と記載する）が形成されている。渦巻溝２４、２６は中心軸線Ｏを中心として５４０°（巻き数＝１．５）に亘って延設されている。渦巻溝２４、２６の本数や中心軸線Ｏを中心とした渦巻溝２４、２６の角度範囲（巻き数）はこれに限定されず、実験等を通じて、振動が小さく或いは除去されるように、適宜決定することができる。また、本例では、渦巻溝２４、２６は、アルキメデスの螺旋（代数螺旋）状に形成されているが、ベルヌーイの螺旋（対数螺旋）状に形成してもよい。更には、渦巻溝２４、２６は、インボリュート曲線に沿って延在するように形成してもよい。 Between the outer peripheral surface 18a of the boss portion 18 and the inner peripheral surface 20a of the tool mounting hole 20, at least one, in this example, two spiral or spiral grooves 24, 26 (hereinafter, spiral groove) are provided. 24 and 26) are formed. The spiral grooves 24, 26 extend around 540° (number of turns=1.5) about the central axis O. The number of spiral grooves 24, 26 and the angular range (the number of turns) of the spiral grooves 24, 26 around the central axis O are not limited to this, and are appropriately determined through experiments or the like so that the vibration is small or eliminated. can do. Further, in this example, the spiral grooves 24 and 26 are formed in the shape of Archimedes' spiral (algebraic spiral), but may be formed in the shape of Bernoulli's spiral (logarithmic spiral). Furthermore, the spiral grooves 24, 26 may be formed so as to extend along the involute curve.
　工具ホルダ１０には、また、中心軸線Ｏに沿って延設された軸方向通路２８が形成されている。軸方向通路２８によって、工具装着穴２０はテーパ部１２の中空部１２ａに連通する。工具ホルダ１０には、更に、複数の径方向通路３０が形成されている。径方向通路３０は、渦巻溝２４、２６の底部に隣接した部分を横断して半径方向に延びている。径方向通路３０によって、渦巻溝２４、２６は軸方向通路２８に連通する。 The tool holder 10 is also formed with an axial passage 28 extending along the central axis O. The tool mounting hole 20 communicates with the hollow portion 12 a of the tapered portion 12 by the axial passage 28. The tool holder 10 is further formed with a plurality of radial passages 30. The radial passage 30 extends radially across the portion of the spiral grooves 24, 26 adjacent the bottom. The radial passage 30 allows the spiral grooves 24, 26 to communicate with the axial passage 28.
　本実施形態によれば、工具Ｔのシャンク部を受容する工具装着穴２０の周囲に渦巻溝２４、２６を形成したので、渦巻溝２４、２６が形成されている領域は剛性、特に半径方向の剛性が低くなり、工具Ｔは、渦巻溝２４、２６の内側で工具装着穴２０より外側の領域と共に半径方向に弾性支持されることとなる。本発明では、図２では二点鎖線の円２２の内側の領域を工具把持部、そして円２２の外側の領域を支持部と称する。円２２は、渦巻溝２４、２６と交差することなく、渦巻溝２４、２６に接する最大の円とすることができる。 According to this embodiment, since the spiral grooves 24 and 26 are formed around the tool mounting hole 20 that receives the shank portion of the tool T, the region in which the spiral grooves 24 and 26 are formed is rigid, particularly in the radial direction. The rigidity becomes low, and the tool T is elastically supported in the radial direction inside the spiral grooves 24 and 26 together with the area outside the tool mounting hole 20. In the present invention, in FIG. 2, the area inside the two-dot chain line circle 22 is called the tool gripping portion, and the area outside the circle 22 is called the supporting portion. The circle 22 can be the largest circle that contacts the spiral grooves 24, 26 without intersecting the spiral grooves 24, 26.
　本実施形態によれば、工具Ｔおよび工具把持部を支持部によって半径方向に弾性支持することによって、渦巻溝２４、２６を備えていない場合と比較して、工具Ｔを含めた工具ホルダ１０の固有振動数を下げることができる。渦巻溝２４、２６の本数、形状、溝幅、中心軸線Ｏを中心とした渦巻溝２４、２６の角度範囲（巻き数）を変更することによって、上記固有振動数を調節することができる。渦巻溝２４、２６の形状は、工具ホルダ１０の中心軸線Ｏに関して対象であることが好ましい。また、工具Ｔを弾性支持することによって、主軸１０８を通じて工作機械１００側から工具Ｔに伝搬される振動を除去または低減することが可能となる。 According to the present embodiment, by elastically supporting the tool T and the tool gripping portion in the radial direction by the support portion, the tool holder 10 including the tool T including the tool T is compared with the case where the spiral grooves 24 and 26 are not provided. The natural frequency can be lowered. The natural frequency can be adjusted by changing the number, shape, groove width, and angular range (number of turns) of the spiral grooves 24, 26 about the central axis O. The shape of the spiral grooves 24, 26 is preferably symmetrical with respect to the central axis O of the tool holder 10. Further, by elastically supporting the tool T, it is possible to eliminate or reduce the vibration transmitted from the machine tool 100 side to the tool T through the spindle 108.
　また、テーパ部１２の中空部１２ａ、軸方向通路２８、径方向通路３０を介して圧縮空気を渦巻溝２４、２６に供給することによって、加工中に発生する加工液の液滴やミスト、または切削屑の渦巻溝２４、２６内への進入を防止することが可能となる。この目的のための圧縮空気は、主軸１０８内に配設された管路を介して供給されるテーパ穴清掃用の圧縮空気を用いることができる。圧縮空気を用いたテーパ穴の清掃は、工作機械の分野では常用されている。 Further, by supplying compressed air to the spiral grooves 24, 26 through the hollow portion 12a of the taper portion 12, the axial passage 28, and the radial passage 30, droplets or mist of the working liquid generated during the working, or It is possible to prevent cutting chips from entering the spiral grooves 24, 26. As the compressed air for this purpose, compressed air for cleaning the tapered hole, which is supplied through a pipe line arranged in the main shaft 108, can be used. Cleaning of the tapered hole with compressed air is commonly used in the field of machine tools.
　工具ホルダ１０は、例えば、工具ホルダ把持部としてのテーパ部１２とボス部１８とが一体に形成されているので、三次元プリンタを用いてＳＵＳ３１６やマルエージング鋼といった素材で製作することができる。また、本発明において、工具ホルダ１０は、フランジ部１４を必ずしも備えていなくともよく、工具ホルダ把持部としてのテーパ部１２と、ボス部１８とが隣接して一体に形成されていてもよい。 Since the tool holder 10 has, for example, the tapered portion 12 as the tool holder gripping portion and the boss portion 18 formed integrally, it can be manufactured from a material such as SUS316 or maraging steel using a three-dimensional printer. Further, in the present invention, the tool holder 10 does not necessarily have to include the flange portion 14, and the tapered portion 12 as the tool holder gripping portion and the boss portion 18 may be formed adjacently and integrally.
　１０　　工具ホルダ
　１２　　テーパ部
　１２ａ　　内面
　１２ａ　　中空部
　１２ｂ　　内面
　１４　　フランジ部
　１４ａ　　当接面
　１６　　周溝
　１８　　ボス部
　１８ａ　　外周面
　２０　　工具装着穴
　２０ａ　　内周面
　２２　　円
　２４　　渦巻溝
　２６　　渦巻溝
　２８　　軸方向通路
　３０　　径方向通路
　１００　　工作機械
　１０８　　主軸
　１２０　　工具マガジン
　１２１　　待機位置
　１２２　　ベース部材
　１２４　　受容部
　１３０　　カバー
　１３２　　隔壁
　１３２ａ　　開口部
　１３２ｂ　　シャッタ
　１３４　　加工室
　１３６　　工具収納室
　１４０　　工具交換装置
　１４２　　交換アーム
　１４２ａ　　グリッパ
　１４２ｂ　　グリッパ
　１４４　　シフタ
　１４６　　工具授受位置 10 Tool Holder 12 Tapered Part 12a Inner Surface 12a Hollow Part 12b Inner Surface 14 Flange Part 14a Abutment Surface 16 Circumferential Groove 18 Boss 18a Outer Surface 20 Tool Mounting Hole 20a Inner Surface 22 Circle 24 Vortex Groove 26 Vortex Groove 28 Axial Passage 30 Radial passage 100 Machine tool 108 Spindle 120 Tool magazine 121 Standby position 122 Base member 124 Receptor 130 Cover 132 Partition wall 132a Opening 132b Shutter 134 Processing chamber 136 Tool storage chamber 140 Tool changing device 142 Exchange arm 142a Gripper 142b Gripper 144 Shifter 146 Tool transfer position

Claims (4)

  1. 　工作機械の主軸に装着される工具を把持する工具ホルダにおいて、
    　工作機械の主軸のクランプ機構で該主軸に把持される工具ホルダ把持部と、
    　工具ホルダの中心軸線に沿って工具ホルダ把持部より先端側に工具ホルダ把持部と一体で形成されたボス部と、
    　工具ホルダの中心軸線に沿ってボス部に形成された工具装着穴と、
    　工具装着穴の周囲に工具ホルダの中心軸線を中心として渦巻状に延びるようにボス部に形成された少なくとも１本の渦巻溝と、
    　を具備することを特徴とした工具ホルダ。     In the tool holder that holds the tool mounted on the spindle of the machine tool,
    A tool holder gripping part that is gripped by the spindle of the machine tool by a clamp mechanism of the spindle,
    A boss portion integrally formed with the tool holder gripping portion on the tip side from the tool holder gripping portion along the central axis of the tool holder,
    A tool mounting hole formed in the boss along the central axis of the tool holder,
    At least one spiral groove formed in the boss portion so as to spirally extend around the center axis of the tool holder around the tool mounting hole,
    A tool holder comprising:
  2. 　工具ホルダの中心軸線に関して対称に配置された２本の渦巻溝を備える請求項１に記載の工具ホルダ。 The tool holder according to claim 1, comprising two spiral grooves that are arranged symmetrically with respect to the central axis of the tool holder.
  3. 　一端において工具装着穴の底面に開口し工具ホルダの中心軸線に沿って延びる軸方向通路と、工具ホルダの中心軸線に関して半径方向に渦巻溝を横断して延びる複数の径方向通路とを更に備え、径方向通路が、各々の一端において軸方向通路に開口しており、径方向通路を介し渦巻溝が軸方向通路に連通するようにした請求項１に記載の工具ホルダ。 Further comprising an axial passage opening at one end in the bottom surface of the tool mounting hole and extending along the central axis of the tool holder, and a plurality of radial passages extending radially across the spiral groove with respect to the central axis of the tool holder, The tool holder according to claim 1, wherein the radial passage is open to the axial passage at one end thereof, and the spiral groove communicates with the axial passage through the radial passage.
  4. 　工具ホルダ把持部とボス部との間で半径方向に突出したフランジ部を更に備え、該フランジ部は、その外周面に沿って延びる周溝が形成されている請求項１に記載の工具ホルダ。 The tool holder according to claim 1, further comprising a flange portion protruding between the tool holder grip portion and the boss portion in a radial direction, the flange portion having a circumferential groove extending along an outer peripheral surface thereof.
PCT/JP2019/050996 2018-12-27 2019-12-25 Tool holder WO2020138229A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02113026U (en) * 1989-02-27 1990-09-10
US20040052598A1 (en) * 2000-12-27 2004-03-18 Franz Haimer Tool holder for a tool that can rotate about an axis of rotation
US6938903B1 (en) * 2000-07-14 2005-09-06 Franz Haimer Maschinenbau Kg Tool holder for a tool, especially a boring, milling or grinding tool, which can be rotated about a rotational axis
JP2007290047A (en) * 2006-04-21 2007-11-08 Hitachi Plant Technologies Ltd Vibration-proof tool
WO2011021495A1 (en) * 2009-08-17 2011-02-24 三和パッキング工業株式会社 Buffer apparatus and metal cover
JP2014205238A (en) * 2008-08-29 2014-10-30 フランツ・ハイマー・マシーネンバウ・カーゲー Tool holder device
JP2016500345A (en) * 2012-12-21 2016-01-12 フランツ ハイマー マシーネンバウ カーゲー Tool holder with built-in cavity

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02113026U (en) * 1989-02-27 1990-09-10
US6938903B1 (en) * 2000-07-14 2005-09-06 Franz Haimer Maschinenbau Kg Tool holder for a tool, especially a boring, milling or grinding tool, which can be rotated about a rotational axis
US20040052598A1 (en) * 2000-12-27 2004-03-18 Franz Haimer Tool holder for a tool that can rotate about an axis of rotation
JP2007290047A (en) * 2006-04-21 2007-11-08 Hitachi Plant Technologies Ltd Vibration-proof tool
JP2014205238A (en) * 2008-08-29 2014-10-30 フランツ・ハイマー・マシーネンバウ・カーゲー Tool holder device
WO2011021495A1 (en) * 2009-08-17 2011-02-24 三和パッキング工業株式会社 Buffer apparatus and metal cover
JP2016500345A (en) * 2012-12-21 2016-01-12 フランツ ハイマー マシーネンバウ カーゲー Tool holder with built-in cavity

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