JP2002224927A - Tool change arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool change arm whose arm body is made of a synthetic resin for weight saving, and still has a coefficient of linear expansion equal to that of a steel material. SOLUTION: The tool change arm is constituted of the arm body 1 made of the synthetic resin molding material, a plate-like metal material 2 equipped with a plurality of projecting parts 4, and a metal member 3. The plate-like metal material 2 is arranged at least on one surface of the arm body 1, while the projecting parts 4 are embedded in the arm body 1. The metal member 3 is also arranged so that it is embedded in a hole part 5 for a turning shaft in the arm body 1. The plate-like metal material 2 and the metal member 3 arranged in the arm body 1 are integratedly formed with the arm body 1 by insert molding.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は，マシニングセンタ
ー等の自動工具交換装置に装備された工具交換アームに
関するもので，更に詳しくはアーム本体が合成樹脂成形
材料でありながら，鋼材並みの線膨張係数が可能な工具
交換アームに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool changing arm provided in an automatic tool changing device such as a machining center. More specifically, the present invention relates to a tool having a linear expansion coefficient comparable to that of steel, even though the arm body is made of a synthetic resin molding material. A possible tool change arm.

【０００２】[0002]

【従来の技術】マシニングセンタ等の組立作業や機能試
験検査は，精度工場のために恒温装置を備えた工場で各
調整作業が行われており，工具の自動交換機能試験も同
装置内で行われている。このようにして高精度に完成さ
れたマシニングセンタが市場においても組立調整時と同
様の高機能を維持するために，特に合成樹脂材料を採用
した機能部品については，機能維持するとともに鋼材に
近い温度差による寸法変化量（線膨張係数）を求められ
ている。2. Description of the Related Art Assembling work of a machining center, etc., and functional test inspections are performed at a factory equipped with a constant temperature device for an accuracy factory, and an automatic tool changing function test is also performed within the same equipment. ing. In order to maintain the same high performance of the machining center completed in this way in the market as at the time of assembly adjustment, especially for functional parts using synthetic resin materials, the functions are maintained and the temperature difference close to that of steel is maintained. Dimensional change (linear expansion coefficient) is determined.

【０００３】自動工具交換装置における工具交換アーム
において，秒単位以下の工具交換時間の短縮化が要求さ
れており，こうような要求に対して工具交換アームを駆
動する装置や，主軸の工具把持装置の改善，工具交換ア
ームの旋回径を小さくする等の改善が行われており，こ
れに関する種々の提案がなされている。一方，工具交換
アームを合成樹脂で軽量化を行い，工具交換時間の短縮
化を図ったものとして特開平２−２７４４４９号公報に
工具交換アーム自体を繊維強化合成樹脂材料で構成した
工具交換アームが提案されている。[0003] In a tool changing arm of an automatic tool changing device, it is required to reduce a tool changing time on the order of seconds or less, and in response to such a request, a device for driving the tool changing arm and a tool holding device for a spindle. And various improvements have been made, such as reducing the turning diameter of the tool changing arm. On the other hand, Japanese Patent Laid-Open Publication No. Hei 2-274449 discloses a tool changing arm which is made of a fiber-reinforced synthetic resin material. Proposed.

【０００４】工具交換アームにおいて，軽量であり然も
鋼材に近い線膨張係数を求められているが，前述した特
開平２−２７４４４９号公報に提案されている工具交換
アームは比重が１．４〜１．６であり軽量化されている
が，線膨張係数が１２．０〜１３．０×１０−６であり
合成樹脂では非常に小さい線膨張係数ではあるが満足す
るには至っていない。[0004] In the tool changing arm, a linear expansion coefficient which is light and is close to that of steel is required. However, the specific gravity of the tool changing arm proposed in Japanese Patent Laid-Open No. 2-274449 described above is 1.4 to 1.4. 1.6, which is lighter, but has a coefficient of linear expansion of 12.0 to 13.0 × 10 −6, which is a very small coefficient of linear expansion for synthetic resins, but is not satisfactory.

【０００５】[0005]

【発明が解決しようとする課題】工具交換アームのアー
ム本体を合成樹脂で軽量化し，しかも鋼材に近い線膨張
係数が可能とする工具交換アームを提供するものであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a tool exchanging arm in which the arm body of the tool exchanging arm is made of a synthetic resin to reduce its weight and has a linear expansion coefficient close to that of steel.

【０００６】[0006]

【課題を解決するための手段】上記目的を達成するため
に本発明の請求項１に記載された工具交換アームは，合
成樹脂成形材料からなるアーム本体1と，複数の突起部
４を配設した板状金属材２と，金属部材３で構成されて
おり，前記板状金属材２の突起部４をアーム本体1に埋
設した状態で，該板状金属材２をアーム本体1の少なく
とも片面に配設し，且つ，前記金属部材３を前記アーム
本体1の旋回軸孔部５に埋設した状態で配設する。アー
ム本体1に配設された板状金属材２と金属部材３をイン
サート成形によりアーム本体1に一体的に形成されたも
のである。According to a first aspect of the present invention, there is provided a tool changing arm including an arm body made of a synthetic resin molding material and a plurality of projections. The plate-shaped metal member 2 is made up of at least one surface of the arm body 1 in a state where the projections 4 of the plate-shaped metal member 2 are embedded in the arm body 1. And the metal member 3 is disposed in a state where the metal member 3 is embedded in the turning shaft hole 5 of the arm body 1. The plate-shaped metal member 2 and the metal member 3 provided on the arm body 1 are formed integrally with the arm body 1 by insert molding.

【０００７】上述の工具交換アームによれば，板状金属
材２に配設された複数の突起部４をアーム本体1に埋設
した状態でアーム本体1の少なくとも片面に配設し，板
状金属材２をインサート成形によりアーム本体1に一体
的に形成されている。この板状金属材２と，板状金属材
２に配設された複数の突起部４がアーム本体1に一体的
に形成されるされることにより，合成樹脂成形材料から
なるアーム本体1の温度差による寸法変化量を抑えるこ
とができる。According to the above-mentioned tool changing arm, the plurality of projections 4 provided on the plate-shaped metal material 2 are disposed on at least one surface of the arm body 1 in a state of being embedded in the arm body 1, and the plate-shaped metal material is provided. The material 2 is formed integrally with the arm body 1 by insert molding. By forming the plate-shaped metal member 2 and the plurality of protrusions 4 provided on the plate-shaped metal member 2 integrally with the arm body 1, the temperature of the arm body 1 made of a synthetic resin molding material is increased. The amount of dimensional change due to the difference can be suppressed.

【０００８】また，本発明の工具交換アームによれば，
金属部材３をアーム本体1の旋回軸孔部５に埋設した状
態で配設され，インサート成形によりアーム本体1に一
体的に形成されたものである。これは，アーム本体1の
旋回軸孔部５に金属部材３を配設することによってアー
ム本体１ａを二分する効果があり，金属部材３と板状金
属材２および複数の突起部４がアーム本体1に一体的に
形成されるされることにより相乗効果を生み，アーム本
体１の温度差による寸法変化量を抑えることができる。
この相乗効果によって，合成樹脂成形材料からなるアー
ム本体1の線膨張係数をより一層小さくなり，本発明の
工具交換アームは鋼材に近い線膨張係数が可能となる。According to the tool change arm of the present invention,
The metal member 3 is provided so as to be buried in the turning shaft hole 5 of the arm body 1 and is formed integrally with the arm body 1 by insert molding. This has the effect of arranging the metal member 3 in the pivot shaft hole 5 of the arm body 1 to divide the arm body 1a into two, and the metal member 3, the plate-like metal material 2, and the plurality of protrusions 4 By forming the arm body 1 integrally, a synergistic effect is produced, and the amount of dimensional change due to a temperature difference of the arm body 1 can be suppressed.
Due to this synergistic effect, the linear expansion coefficient of the arm body 1 made of a synthetic resin molding material is further reduced, and the tool changing arm of the present invention can have a linear expansion coefficient close to that of steel.

【０００９】[0009]

【発明の実施の形態】以下，本発明の具体的な実施形態
を添付図面に基づき説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

【００１０】［実施例１］図１，図２は，実施例１に用
いた工具交換アームを示す。図１は工具交換アームの正
面図を示し，図２は，図１のＡ−Ａ断面図を示す。実施
例１で用いた工具交換アームのツール間ピッチは４１５
であり，サイズは概ね幅１２５，厚み２５である。本発
明の工具交換アームのアーム本体１を構成する成形材料
は炭素繊維で強化されたフェノール系樹脂を用いてお
り，アーム本体１の片面に配設された板状金属材２は材
質ＳＫ５を用いており板厚４ｍｍである。板状金属材２
には複数のＭ６ネジ孔と熱処理（ＨＲＣ５５〜６０）が
施されている。板状金属材２に配設された複数の突起部
４を構成する部材にはＭ６ボルトを用いており，板状金
属材２のＭ６ネジ孔に固定されている。また，アーム本
体１の旋回軸孔部５に配設された金属部材３は材質Ｓ５
５Ｃを用いており，金属部材３の外周面には帯状の溝と
ローレット加工が，金属部材３の内径面には工具交換ア
ーム軸と嵌合する旋回軸孔５が施されている。 成形金
型の所定位置に金属部材３を装着し，板状金属材２に配
設された複数の突起部４を構成するＭ６ボルトの頭がア
ーム本体１に埋設する方向でインサート成形すること
で，図２に示すように板状金属材２および突起部４と金
属部材３がアーム本体１と一体的に形成される。[Embodiment 1] FIGS. 1 and 2 show a tool changing arm used in Embodiment 1. FIG. FIG. 1 shows a front view of the tool changing arm, and FIG. 2 shows a cross-sectional view taken along line AA of FIG. The pitch between tools of the tool changing arm used in the first embodiment is 415.
The size is approximately width 125 and thickness 25. The molding material forming the arm body 1 of the tool change arm of the present invention uses a phenolic resin reinforced with carbon fiber, and the plate-like metal material 2 disposed on one surface of the arm body 1 uses the material SK5. The plate thickness is 4 mm. Sheet metal material 2
Have been subjected to a plurality of M6 screw holes and heat treatment (HRC 55-60). M6 bolts are used as members constituting the plurality of protrusions 4 provided on the plate-shaped metal member 2, and are fixed to M6 screw holes of the plate-shaped metal member 2. The metal member 3 disposed in the pivot shaft hole 5 of the arm body 1 is made of a material S5.
5C, a band-shaped groove and knurling are provided on the outer peripheral surface of the metal member 3, and a turning shaft hole 5 is formed on the inner surface of the metal member 3 so as to be fitted with a tool changing arm shaft. The metal member 3 is mounted at a predetermined position of the molding die, and insert molding is performed in a direction in which the heads of M6 bolts constituting the plurality of protrusions 4 provided on the plate-shaped metal material 2 are embedded in the arm body 1. As shown in FIG. 2, the plate-shaped metal member 2 and the projections 4 and the metal member 3 are formed integrally with the arm body 1.

【００１１】前述のようにして一体的に形成された工具
交換アームは，板状金属材２に配設された複数の突起部
４が，アーム本体１から板状金属材２が剥離するのを防
止している。アーム本体１の内部に複数の突起部４が埋
設することでアーム本体１と板状金属材２が一体とな
り，アーム本体１は板状金属材２の温度差による寸法変
化量に近づけることが可能となる。一方，アーム本体１
の旋回軸孔部５に配設された金属部材３によってアーム
本体１を二分する効果があり，板状金属材２と板状金属
材２に配設された複数の突起部４と金属部材３が相乗効
果となり，アーム本体１の温度差による寸法変化量を抑
えている。このようにして一体的に形成された実施例１
に示す工具交換アームは，鋼材に比べて約３８％に軽量
化され，線膨張係数は１１．５〜１１．７×１０−６を
得ることができた。The tool exchange arm integrally formed as described above has a plurality of protrusions 4 provided on the plate-shaped metal member 2 for preventing the plate-shaped metal member 2 from peeling off from the arm body 1. Preventing. By embedding a plurality of protrusions 4 inside the arm body 1, the arm body 1 and the plate-shaped metal material 2 are integrated, and the arm body 1 can approach the dimensional change due to the temperature difference of the plate-shaped metal material 2. Becomes On the other hand, the arm body 1
The metal member 3 disposed in the turning shaft hole 5 has an effect of bisecting the arm body 1, the plate-shaped metal member 2, the plurality of protrusions 4 disposed in the plate-shaped metal member 2, and the metal member 3. Has a synergistic effect, and the amount of dimensional change due to the temperature difference of the arm body 1 is suppressed. Example 1 thus integrally formed
The tool change arm shown in (1) was reduced in weight to about 38% as compared with steel, and a linear expansion coefficient of 11.5 to 11.7 × 10 −6 was obtained.

【００１２】［実施例２］図３，図４は，実施例２に用
いた工具交換アームを示す。図３は，工具交換アームの
正面図を示し，図４は，図３のＢ−Ｂ断面図を示す。実
施例２で用いた工具交換アームのツール間ピッチは４８
０であり，サイズは概ね幅１６５，厚み３５である。本
発明の工具交換アームのアーム本体１ａを構成する成形
材料は炭素繊維で強化されたフェノール系樹脂を用いて
おり，アーム本体１ａの両面に配設された板状金属材２
ａ（板厚５ｍｍ），２ｂ（板厚３ｍｍ）は材質ＳＫ５を
用いている。板状金属材２ａ，２ｂには複数のＭ８ネジ
孔と熱処理（ＨＲＣ５５〜６０）が施されている。板状
金属材２ａ，２ｂに配設された複数の突起部４を構成す
る部材にはＭ８ボルトを用いており，板状金属材２ａ，
２ｂのＭ８ネジ孔に固定されている。また，アーム本体
１ａの旋回軸孔部５ａに配設された金属部材３ａは材質
Ｓ５５Ｃを用いており，金属部材３ａの外周面には帯状
の溝とローレット加工が，金属部材３ａの内径面には工
具交換アーム軸と嵌合する旋回軸孔５ａが施されてい
る。成形金型の所定位置に金属部材３ａを装着し，板状
金属材２ａ，２ｂに配設された複数の突起部４を構成す
るＭ８ボルトの頭がアーム本体１ａに埋設する方向でイ
ンサート成形することで，図４に示すように板状金属材
２ａ，２ｂおよび突起部４と金属部材３ａがアーム本体
１と一体的に形成される。Second Embodiment FIGS. 3 and 4 show a tool changing arm used in a second embodiment. FIG. 3 shows a front view of the tool changing arm, and FIG. 4 shows a sectional view taken along line BB of FIG. The pitch between the tools of the tool changing arm used in the second embodiment is 48
0, and the size is approximately width 165 and thickness 35. The molding material forming the arm body 1a of the tool change arm of the present invention is made of a phenolic resin reinforced with carbon fiber, and the plate-like metal material 2 provided on both surfaces of the arm body 1a is used.
Material SK5 is used for a (plate thickness 5 mm) and 2b (plate thickness 3 mm). A plurality of M8 screw holes and heat treatment (HRC 55 to 60) are applied to the plate-shaped metal members 2a and 2b. M8 bolts are used for members forming the plurality of protrusions 4 provided on the plate-like metal members 2a and 2b, and the plate-like metal members 2a and 2b
It is fixed to the M8 screw hole of 2b. The metal member 3a disposed in the turning shaft hole 5a of the arm body 1a is made of a material S55C, and a band-shaped groove and knurling are performed on the outer peripheral surface of the metal member 3a. Is provided with a turning shaft hole 5a to be fitted with the tool changing arm shaft. A metal member 3a is mounted at a predetermined position of a molding die, and insert molding is performed in a direction in which the heads of M8 bolts constituting a plurality of protrusions 4 provided on the plate-like metal members 2a and 2b are embedded in the arm body 1a. As a result, as shown in FIG. 4, the plate-shaped metal members 2 a and 2 b, the protrusion 4, and the metal member 3 a are formed integrally with the arm body 1.

【００１３】前述のようにして一体的に形成された工具
交換アームは，実施例1と同様に板状金属材２ａ，２ｂ
に配設された複数の突起部４が，アーム本体１ａから板
状金属材２ａ，２ｂが剥離するのを防止している。一
方，アーム本体１ａの旋回軸孔部５ａに配設された金属
部材３ａによってアーム本体１ａを二分する効果があ
り，アーム本体１ａの両面に配設した板状金属材２ａ，
２ｂに配設された複数の突起部４と金属部材３ａが相乗
効果となり，アーム本体１ａの温度差による寸法変化量
を抑えている。このようにして一体的に形成された実施
例２に示す工具交換アームは，鋼材に比べて約４４％に
軽量化され，線膨張係数は１１．２〜１１．４×１０−
６を得ることができた。The tool changing arm integrally formed as described above is provided with the plate-like metal members 2a and 2b as in the first embodiment.
The plurality of protrusions 4 disposed on the arm body 1a prevent the plate-shaped metal members 2a and 2b from peeling off from the arm body 1a. On the other hand, the metal member 3a provided in the turning shaft hole 5a of the arm body 1a has an effect of bisecting the arm body 1a, and the plate-shaped metal members 2a,
The plurality of protrusions 4 and the metal member 3a arranged on the second member 2b have a synergistic effect, and the amount of dimensional change due to the temperature difference of the arm body 1a is suppressed. The tool change arm of the second embodiment integrally formed in this manner is reduced in weight by about 44% compared to steel, and has a linear expansion coefficient of 11.2 to 11.4 × 10 −.
6 could be obtained.

【００１４】実施例１〜２は，ＡＴＣ装置において工具
交換アーム軸と工具交換アームの旋回軸孔の間に，旋回
トルクを伝達させる締結具（例えばシュパンリング等）
を介して工具交換アームを旋回させるＡＴＣ装置に用い
た本発明の工具交換アームの実施例を述べているが，一
方，工具交換アーム軸にフランジ等を設け，前記フラン
ジ等にネジ孔または孔部を設けて，工具交換アーム旋回
中心部とボルト等で固定し直接旋回トルクを工具交換ア
ームに伝達させるＡＴＣ装置がある。このようなＡＴＣ
装置に本発明の工具交換アームを用いたときには，実施
実験によればアーム本体の旋回中心部に前記フランジ等
と勘合する孔部またはネジ孔を設けて，工具交換アーム
軸とアーム本体を固定することでアーム本体の旋回軸孔
部に設けられた金属部材を除外しても実施例と近似した
線膨張係数が可能であり，鋼材に比べ約３４〜４１％に
軽量化が可能となる。Embodiments 1 and 2 relate to a fastener (for example, a spanning ring) for transmitting a turning torque between a tool changing arm shaft and a turning shaft hole of the tool changing arm in an ATC device.
Although the embodiment of the tool change arm of the present invention used in the ATC device for rotating the tool change arm through the shaft is described, on the other hand, a flange or the like is provided on the shaft of the tool change arm, and a screw hole or a hole is formed in the flange or the like. There is an ATC device which is provided with a tool changing arm, which is fixed to a turning center of the tool changing arm with a bolt or the like, and directly transmits turning torque to the tool changing arm. Such an ATC
When the tool change arm of the present invention is used in the device, according to an experiment conducted, a hole or a screw hole is provided at the center of rotation of the arm body to be fitted with the flange or the like, and the tool change arm shaft and the arm body are fixed. Thus, even if the metal member provided in the turning shaft hole of the arm body is omitted, a linear expansion coefficient similar to that of the embodiment can be achieved, and the weight can be reduced to about 34 to 41% as compared with steel.

【００１５】また，実施例に開示していないが，例え
ば，工具呼び番号ＢＴ２０以下のようなツール間の旋回
ピッチが短いＡＴＣ装置に本発明の工具交換アームを用
いたときには，実施実験によれば実施例１で示す金属部
材３をアーム本体１の旋回軸孔部５にインサート成形さ
れた成形品に，板状金属材２を複数のネジ等で後で取付
けても，板状金属材２をアーム本体１の片面にインサー
ト成形により一体的形成したものと近似した線膨張係数
が可能である。Although not disclosed in the embodiment, for example, when the tool changing arm of the present invention is used in an ATC device having a short turning pitch between tools such as a tool number BT20 or less, according to an experiment, Even if the plate-shaped metal material 2 is later attached with a plurality of screws or the like to the molded product obtained by insert-molding the metal member 3 shown in the first embodiment in the turning shaft hole 5 of the arm main body 1, the plate-shaped metal material 2 can be attached. A linear expansion coefficient similar to that formed integrally by insert molding on one surface of the arm body 1 is possible.

【００１６】本発明の工具交換アームにおいて，合成樹
脂成形材料からなるアーム本体は，公知である炭素繊
維,ガラス繊維,アラミド繊維等の繊維単独若しくは複合
繊維で強化されたフェノール系樹脂等の熱硬化性樹脂を
用いている。これはフェノール系樹脂が線膨張係数が小
さく，耐油性，寸法安定性があり経時変化が少なく，工
具交換時に異常な衝撃力が繰り返しなされても塑性変形
が少なく，アーム本体の成形材料に適しているからであ
る。その他の合成樹脂で線膨張係数が小さく，アーム本
体に適した成形材料があればそれを用いてもよい。ま
た，線膨張係数を小さくすることと，工具交換アームの
強度等から強化する上記繊維の配合比は４０重量％以上
が望ましい。In the tool changing arm of the present invention, the arm body made of a synthetic resin molding material is made of a known fiber such as carbon fiber, glass fiber or aramid fiber alone or a thermosetting material such as phenolic resin reinforced with composite fiber. Resin is used. This is because phenolic resin has low coefficient of linear expansion, oil resistance, dimensional stability, little change over time, little plastic deformation even if abnormal impact force is repeatedly applied during tool change, suitable for molding material of arm body Because there is. Any other synthetic resin having a small coefficient of linear expansion and suitable for the arm body may be used. Further, it is desirable that the mixing ratio of the fibers to be strengthened in view of the reduction of the linear expansion coefficient and the strength of the tool changing arm is 40% by weight or more.

【００１７】本発明の工具交換アームを構成する板状金
属材は，実施例ではＳＫ５を用いて熱処理（ＨＲＣ５５
〜６０）を施している。熱処理することで板状金属材の
バネ効果を高め工具交換時の異常時に発生する衝撃力を
吸収し，スピンドル内部や工具交換アームの駆動部に損
傷等の発生を防止しているが，塑性変形がなくバネ効果
のあるその他の鋼材を用いてもよい。また，焼き入れ硬
度はＨＲＣ５５〜６０を用いているがこれに限るもので
はない。In the embodiment, the plate-like metal material constituting the tool changing arm of the present invention is heat-treated using SK5 (HRC55).
~ 60). The heat treatment enhances the spring effect of the sheet metal material, absorbs the impact force generated during abnormalities during tool change, and prevents damage to the inside of the spindle and the drive of the tool change arm. Other steel materials having no spring effect and having a spring effect may be used. The quenching hardness is HRC55-60, but is not limited thereto.

【００１８】本発明の工具交換アームを構成する板状金
属材に配設された複数の突起部の部材は，実施例ではボ
ルトを用いて板状金属材のネジ孔に固定されているが，
これはボルトが安価でありボルト頭がアンカーの役目を
果たすためである。前記ボルトの機械強度は，実施実験
ではＪＩＳ−Ｂ１０５１，強度区分１０．９以上が望ま
しく，強度区分８．８以下では異常発生が繰り返しなさ
れた場合，板状金属材のネジ孔に固定されたボルトのネ
ジ山が破損に至る場合がある。また，実施例では突起部
の部材としてコスト的に安価であるボルトを用いている
が，凹凸部を有する他の部材を板状金属材に配設しても
よい。In the embodiment, the members of the plurality of projections provided on the plate-like metal material constituting the tool changing arm of the present invention are fixed to the screw holes of the plate-like metal material using bolts in the embodiment.
This is because the bolt is inexpensive and the bolt head acts as an anchor. The mechanical strength of the bolt is desirably JIS-B1051 and strength class 10.9 or more in the experiment, and if the occurrence of abnormalities is repeated in the strength category 8.8 or less, the bolt fixed to the screw hole of the sheet metal material. Thread may be damaged. Further, in the embodiment, a bolt which is inexpensive in cost is used as the member of the projection, but another member having the unevenness may be provided on the plate-like metal material.

【００１９】本発明の工具交換アームを構成するアーム
本体の旋回軸孔部に配設した金属部材は実施例ではＳ５
５Ｃを用いているが，これは締結具の最大伝達トルクの
面圧に対してＳ５５Ｃは降伏点応力が優れており，他の
鋼材よりも外径寸法が小さく設計できコスト面で優位で
ある。例えば，工具呼び番号ＢＴ２０以下のような締結
具の伝達トルクが小さいＡＴＣ装置に本発明の工具交換
アーム用いたときには他の安価な鋼材を用いてもよい。
また，実施例では金属部材の外周面には帯状の溝とロー
レット加工が施されているが，これによって工具交換時
に異常な衝撃力が繰り返しなされてもアーム本体と金属
部材の剥離を防止することができる。In the embodiment, the metal member provided in the turning shaft hole of the arm body constituting the tool changing arm of the present invention is S5.
Although 5C is used, S55C has an excellent yield point stress with respect to the surface pressure of the maximum transmission torque of the fastener, and can be designed to have a smaller outer diameter than other steel materials, which is superior in cost. For example, when the tool change arm of the present invention is used in an ATC device having a small transmission torque of a fastener such as a tool number BT20 or less, another inexpensive steel material may be used.
In the embodiment, the outer peripheral surface of the metal member is provided with a band-shaped groove and knurling, which prevents the arm body and the metal member from peeling even if an abnormal impact force is repeatedly applied during tool change. Can be.

【００２０】[0020]

【効果】実施例１，２に示す本発明の工具交換アーム
と，特開平２−２７４４４９号公報に提案されている従
来技術の工具交換アームと線膨張係数を比較した試験デ
ーターを示す。温度４０〜２００℃における平均線膨張
係数は，実施例１の場合，１１．５〜１１．７×１０−
６であり，実施例２の場合，１１．２〜１１．４×１０
−６が得られた。一方，特開平２−２７４４４９号公報
に提案されている従来技術の工具交換アームは１２．０
〜１３．０×１０−６であった。硬鋼の２０℃における
線膨張係数が１０．７２〜１０．７３×１０−６であ
り，この数値には及ばないが本発明の工具交換アーム線
膨張係数は，軟鋼〜ねずみ鋳鉄の線膨張係数（１１．１
６〜１１．８０×１０−６）とほぼ匹敵する数値であ
り，本目的である鋼材に近かい線膨張係数を備え，且
つ，金属製に比べ約４０％に軽量化ができ工具交換時間
の短縮化が可能な工具交換アームを達成することができ
た。[Effects] Test data comparing the coefficient of linear expansion with the tool change arm of the present invention shown in Examples 1 and 2 and the tool change arm of the prior art proposed in Japanese Patent Laid-Open No. 2-274449 are shown. In the case of Example 1, the average linear expansion coefficient at a temperature of 40 to 200 ° C. is 11.5 to 11.7 × 10 −.
6, in the case of the second embodiment, 11.2 to 11.4 × 10
-6 was obtained. On the other hand, a conventional tool change arm proposed in Japanese Patent Application Laid-Open No. 2-274449 is 12.0.
１３13.0 × 10 −6. Although the linear expansion coefficient of hard steel at 20 ° C. is 10.72 to 10.73 × 10 −6, the linear expansion coefficient of the tool changing arm of the present invention is less than this value, but the linear expansion coefficient of mild steel to gray cast iron is as follows. (11.1
6-11.80 × 10-6), which has a coefficient of linear expansion close to that of steel, which is the object of the present invention, and can be reduced in weight to about 40% compared to metal, reducing tool change time. A tool changing arm that can be shortened was achieved.

【００２１】また，本発明の工具交換アームは，工具交
換時に異常が繰り返されても複数の突起部を配設した板
状金属材のバネ効果で，異常時に発生する衝撃力を吸収
することができ，スピンドル内部や工具交換アームの駆
動部に損傷等の発生を防止する効果がある。Further, the tool change arm of the present invention can absorb the impact force generated at the time of the abnormality by the spring effect of the plate-like metal material having the plurality of projections even if the abnormality is repeated at the time of the tool exchange. This has the effect of preventing damage to the inside of the spindle and the drive section of the tool changing arm.

【図面の簡単な説明】[Brief description of the drawings]

【図１】は，本発明の工具交換アームの実施例１の正面
図を示す。FIG. 1 is a front view of a tool changing arm according to a first embodiment of the present invention.

【図２】は，図１のＡ−Ａ断面図を示す。FIG. 2 is a sectional view taken along line AA of FIG.

【図３】は，本発明の工具交換アームの実施例２の正面
図を示す。FIG. 3 is a front view of a tool changing arm according to a second embodiment of the present invention.

【図４】は，図３のＢ−Ｂ断面図を示す。図面の符号の
説明 １，１ａ アーム本体 ２，２ａ，２ｂ 板状金属材 ３，３ａ 金属部材 ４ 突起部 ５ 旋回軸孔部FIG. 4 is a sectional view taken along line BB of FIG. DESCRIPTION OF SYMBOLS IN THE DRAWINGS 1, 1a Arm body 2, 2a, 2b Plate-shaped metal material 3, 3a Metal member 4 Projection 5 Rotation shaft hole

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】自動工具交換装置における工具交換アーム
であって，合成樹脂成形材料からなるアーム本体１と，
複数の突起部４を配設した板状金属材２と，金属部材３
で構成されており，前記板状金属材２の突起部４を前記
アーム本体１に埋設した状態で，該板状金属材２をアー
ム本体１の少なくとも片面に配設し，前記金属部材３を
アーム本体１の旋回軸孔部５に埋設した状態で配設し，
本体アーム１に配設された板状金属材２と金属部材３を
インサート成形によりアーム本体１に一体的に形成され
てなる工具交換アーム。1. A tool changing arm in an automatic tool changing device, comprising: an arm body 1 made of a synthetic resin molding material;
A plate-shaped metal member 2 on which a plurality of protrusions 4 are disposed;
The plate-shaped metal member 2 is disposed on at least one surface of the arm body 1 in a state where the projections 4 of the plate-shaped metal member 2 are buried in the arm body 1. It is disposed in a state buried in the turning shaft hole 5 of the arm body 1,
A tool exchange arm in which a plate-shaped metal material 2 and a metal member 3 provided on a main body arm 1 are formed integrally with the arm main body 1 by insert molding.