JP4135678B2 - Screw tightening method - Google Patents

Screw tightening method Download PDF

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JP4135678B2
JP4135678B2 JP2004156413A JP2004156413A JP4135678B2 JP 4135678 B2 JP4135678 B2 JP 4135678B2 JP 2004156413 A JP2004156413 A JP 2004156413A JP 2004156413 A JP2004156413 A JP 2004156413A JP 4135678 B2 JP4135678 B2 JP 4135678B2
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component
load
screw
magnitude
screw tightening
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JP2005335007A (en
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雄一 真方
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Denso Corp
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Denso Corp
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本発明は、第一部品と第二部品を圧入状態でねじ締め付けする方法に関する。   The present invention relates to a method for screwing a first part and a second part in a press-fit state.

例えば、図2に示すように、第一の部品10と第二の部品20を、気密性を確保した状態で互いにねじ締め固定して完成される製品がある。この場合、2つの部品10、20の間の気密性は、Oリング12などのシールを2つの部品10、20の間に配置することによって保証されるのが一般的である(例えば、特許文献1参照。)。   For example, as shown in FIG. 2, there is a product that is completed by screwing and fixing the first component 10 and the second component 20 to each other while ensuring airtightness. In this case, the airtightness between the two parts 10 and 20 is generally ensured by arranging a seal such as an O-ring 12 between the two parts 10 and 20 (for example, Patent Documents). 1).

特開5−23928号公報JP-A-5-23928

このような2つの部品10、20をねじ締め付け固定するためには、図7に示すねじ締め付け装置1が採用されている。この装置1において、第一部品10は部品保持部13に不動に固定されており、他方、第二部品20は、上下可動部3に連結されたチャック6に保持されており、上下方向に移動可能かつ回転可能である。この装置1を用いて、最初、不動の第一部品10に向けて部品20を押圧することにより、第一部品10に向けて第二部品20を圧入し、次に、第一部品10に対して第二部品20を押圧しつつ相対回転させることにより、部品10、20のねじ部11、21を噛み合わせてねじ締めする方法が採用されている。   In order to fix such two parts 10 and 20 with screws, a screw tightening device 1 shown in FIG. 7 is employed. In this apparatus 1, the first component 10 is fixed to the component holding unit 13, while the second component 20 is held by the chuck 6 connected to the vertical movable unit 3 and moves in the vertical direction. Possible and rotatable. Using this device 1, first, by pressing the component 20 toward the stationary first component 10, the second component 20 is pressed into the first component 10, and then the first component 10 is pressed against the first component 10. Thus, a method of engaging and screwing the threaded portions 11 and 21 of the components 10 and 20 by relatively rotating while pressing the second component 20 is employed.

ところで、第一部品10と第二部品20を互いに向けて押圧する荷重は、チャック6と可動部3の間のばね30で生成されている。それゆえ、第一部品10と第二部品20のねじ部11、21の噛み合わせ時とねじ締め時の押圧荷重の大きさは、最初の圧入時に必要な大きさのままである。そのため、圧入時に必要な押圧荷重が大きくなってしまう場合には、部品10、20のねじ部11、21を噛み合せる時にも大きなままであり、その結果、ねじ部11、21が傾いた状態で噛み合わさってしまい、2つの部品10、20を相対的に回転させても、確実に部品10、20をねじ締めすることができないという問題点があった。   Incidentally, a load that presses the first component 10 and the second component 20 toward each other is generated by a spring 30 between the chuck 6 and the movable portion 3. Therefore, the magnitude of the pressing load at the time of meshing the screw parts 11 and 21 of the first part 10 and the second part 20 and at the time of screw fastening remains the magnitude required at the first press-fitting. Therefore, when the pressing load required at the time of press-fitting becomes large, it remains large when the screw portions 11 and 21 of the parts 10 and 20 are engaged with each other, and as a result, the screw portions 11 and 21 are inclined. Even if the two parts 10 and 20 are relatively rotated, there is a problem that the parts 10 and 20 cannot be securely screwed.

そこで、本発明の目的は、確実に第一部品と第二部品を圧入状態でねじ締め付けする方法を提供することである。   Therefore, an object of the present invention is to provide a method for securely screwing the first part and the second part in a press-fit state.

本発明の請求項1に係るねじ締め付けする方法によれば、ねじ部を有する第一部品と、ねじ部と係合するねじ部を有する第二部品を圧入状態でねじ締め付けする方法において、第一部品と第二部品を第一の荷重で互いに向けて押圧することにより、第一部品と第二部品を一定の相対距離まで圧入する段階と、第一部品と第二部品を、第一の荷重よりも小さな第二の荷重で互いに向けて押圧しつつ、第一部品と第二部品を相対的に回転させることにより、第一部品のねじ部と第二部品のねじ部を噛み合わせる段階と、第一部品と第二部品を、第二の荷重よりも小さな第三の荷重で互いに向けて押圧しつつ、第一部品と第二部品をさらに相対的に回転させることにより、第一部品と第二部品をねじ締めする段階とを備えている。これにより、ねじ部の噛み合わせ段階とねじ締め段階とにおいて、圧入段階中の押圧荷重よりも小さな押圧荷重で、第一部品と第二部品を相対的に回転させることができるので、確実に第一部品と第二部品をねじ締めすることができる。   According to the screw tightening method according to claim 1 of the present invention, in the method of screw tightening the first component having the screw portion and the second component having the screw portion engaged with the screw portion in the press-fit state, Pressing the part and the second part toward each other with a first load to press-fit the first part and the second part to a certain relative distance, and the first part and the second part with the first load Engaging the screw part of the first part and the screw part of the second part by relatively rotating the first part and the second part while pressing toward each other with a smaller second load; and The first part and the second part are further rotated relative to each other while pressing the first part and the second part toward each other with a third load smaller than the second load. Screwing the two parts together. Accordingly, the first part and the second part can be relatively rotated with a pressing load smaller than the pressing load during the press-fitting stage in the meshing stage and the screw tightening stage of the screw portion, so that the first One part and the second part can be screwed together.

また、請求項2に係るねじ締め付けする方法によれば、第二の荷重の大きさは、第一の荷重の大きさの約2分の1であり、第三の荷重の大きさは、第一の荷重の大きさの約3分の1である。   Further, according to the screw tightening method according to claim 2, the magnitude of the second load is about one half of the magnitude of the first load, and the magnitude of the third load is It is about one third of the magnitude of one load.

以下、本発明の実施例について添付図面を参照しつつ詳細に説明する。最初に、本発明でねじ締め付けする第一部品10と第二部品20について図2を参照しつつ説明する。第一部品10は、本実施例では、中実の棒状であり、先端側の外周面には、雄ねじ部11が設けられており、この雄ねじ部11よりも基端側において、Oリング12が環状溝部内に収納されている。他方、第二部品20は、本実施例では、上側の中実部分と、下側の筒状部分とで構成されている。さらに、下側の筒状部分には、その基部側の内周面に雌ねじ部21が設けられている。このような構成により、第一部品10に対して第二部品20を圧入する際に、最初に第一部品10のOリング12が第二部品20の内周面によって潰され、次に第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が噛み合わさるようになっている。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, the first component 10 and the second component 20 to be screwed in the present invention will be described with reference to FIG. In the present embodiment, the first component 10 has a solid rod shape, and a male screw portion 11 is provided on the outer peripheral surface on the distal end side, and an O-ring 12 is provided on the base end side of the male screw portion 11. It is stored in the annular groove. On the other hand, the 2nd component 20 is comprised in the present Example by the upper solid part and the lower cylindrical part. Furthermore, the internal thread part 21 is provided in the inner peripheral surface of the base side at the lower cylindrical part. With such a configuration, when the second component 20 is press-fitted into the first component 10, the O-ring 12 of the first component 10 is first crushed by the inner peripheral surface of the second component 20, and then the first The male screw portion 11 of the component 10 and the female screw portion 21 of the second component 20 are engaged with each other.

図1は、本発明のねじ締め付け方法で用いるねじ締め付け装置を示す全体図である。第一部品10は、床に固定された第一部品保持具13に保持されている。また、ねじ締め付け装置1は、床に不動に固定されている、装置1の本体であるベース部2と、第二部品20を着脱自在に上下方向に移動可能かつ回転可能に保持するように、ベース部2に接続されている上下可動部3とで概ね構成されている。   FIG. 1 is an overall view showing a screw tightening device used in the screw tightening method of the present invention. The first component 10 is held by a first component holder 13 fixed to the floor. Further, the screw tightening device 1 is fixed to the floor so as to hold the base portion 2 which is the main body of the device 1 and the second component 20 so that the second component 20 can be detachably moved up and down and rotated. It is generally composed of a vertically movable part 3 connected to the base part 2.

上下可動部3は、本実施例では、ベース部2に固定された垂直なボールねじ(図示せず)上に搭載されたスライドテーブルの形態であり、上下可動部3は、ボールねじを介して上下駆動モータ4に連結されている。このような構成により、上下駆動モータ4の回転により、上下可動部3を垂直方向に上下に移動させることができる。なお、バランスシリンダ8が、ベース部2と上下可動部3の間に接続されており、可動部3の自重を平衡させている。   In this embodiment, the vertically movable portion 3 is in the form of a slide table mounted on a vertical ball screw (not shown) fixed to the base portion 2, and the vertically movable portion 3 is interposed via the ball screw. It is connected to the vertical drive motor 4. With such a configuration, the vertical movable unit 3 can be moved up and down in the vertical direction by the rotation of the vertical drive motor 4. A balance cylinder 8 is connected between the base portion 2 and the vertically movable portion 3 to balance the weight of the movable portion 3.

回転部5は、本実施例では歯車形状であり、歯車のハブ部の外周面において軸受を介して上下可動部3に連結されている。それゆえ、回転部5は回転自在に上下可動部3に保持されている。また、歯車の歯51は、回転駆動モータ7の軸に連結された歯71と係合しているので、回転駆動モータ7の回転により、回転部5を水平面内で回転させることができる。このように、回転部5は、上下方向に移動可能かつ回転可能である。   The rotating portion 5 has a gear shape in this embodiment, and is connected to the vertically movable portion 3 via a bearing on the outer peripheral surface of the hub portion of the gear. Therefore, the rotating part 5 is rotatably held by the vertically movable part 3. Since the gear teeth 51 are engaged with the teeth 71 connected to the shaft of the rotation drive motor 7, the rotation unit 5 can be rotated in the horizontal plane by the rotation of the rotation drive motor 7. Thus, the rotating part 5 is movable and rotatable in the vertical direction.

さらに、一対の把持部61、62からなるチャック部6が、回転部5の先端に保持されている。チャック部6の一対の把持部61、62は、図示しないばねによって、第二部品20を解放する開位置に付勢されている。また、把持部61、62は、コンプレッサなどの圧縮空気を供給する手段(図示せず)と、回転部5の中央の空気通路を介して接続されている。これにより、コンプレッサを作動すると、チャック部6の一対の把持部61、62は、第二部品20を把持する閉位置に移動し、コンプレッサを作動停止すると、把持部61、62は、第二部品20を解放する開位置に移動する。以上の構成により、チャック部6で、第二部品20を着脱自在に上下方向に移動可能にかつ回転可能に保持することができる。   Further, a chuck portion 6 including a pair of gripping portions 61 and 62 is held at the tip of the rotating portion 5. The pair of gripping portions 61 and 62 of the chuck portion 6 is urged to an open position for releasing the second component 20 by a spring (not shown). The gripping portions 61 and 62 are connected to a means (not shown) for supplying compressed air such as a compressor via an air passage at the center of the rotating portion 5. Thus, when the compressor is operated, the pair of gripping portions 61 and 62 of the chuck portion 6 are moved to the closed position for gripping the second component 20, and when the compressor is stopped, the gripping portions 61 and 62 are moved to the second component. Move to open position to release 20. With the above configuration, the second part 20 can be detachably moved in the up-down direction and rotatably held by the chuck portion 6.

また、チャック部6の位置、すなわち、第二部品20の位置を検出するセンサ9がベース部2に配置されている。これにより、センサ9で検出したチャック部6の位置に基づいて、すなわち、圧入段階、噛み合わせ段階、ねじ締め段階などの段階に応じて、第二部品20を第一部品10に向けて押圧する荷重を変更すべく、上下可動部3の下降で生じる力を上下駆動モータ4で制御する。   A sensor 9 that detects the position of the chuck portion 6, that is, the position of the second component 20, is disposed on the base portion 2. Accordingly, the second component 20 is pressed toward the first component 10 based on the position of the chuck portion 6 detected by the sensor 9, that is, depending on the press-fitting stage, the meshing stage, the screw tightening stage, and the like. In order to change the load, the force generated by the lowering of the vertically movable portion 3 is controlled by the vertically driving motor 4.

次に、本発明のねじ締め付け方法について図3〜6を参照しつつ説明する。最初に、圧入段階では、チャック6で保持した第二部品20を、第一部品10に向けて下降させ、第一部品10のOリング12が第二部品20に触れていない、図3に示す位置と、第一部品10のOリング12が潰されて第二部品20の内周面に当接している、図4に示す位置を通って、第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が当接する図5に示す位置まで、第二部品20を下降させる。なお、この時に可動部3が第二部品20を押圧する第一の荷重の大きさは、第一部品10のOリング12が潰されるのに必要な大きさに選択されている。   Next, the screw fastening method of the present invention will be described with reference to FIGS. First, in the press-fitting stage, the second part 20 held by the chuck 6 is lowered toward the first part 10, and the O-ring 12 of the first part 10 does not touch the second part 20, as shown in FIG. Through the position and the position shown in FIG. 4 where the O-ring 12 of the first part 10 is crushed and is in contact with the inner peripheral surface of the second part 20, the male screw portion 11 of the first part 10 and the second part The second component 20 is lowered to the position shown in FIG. At this time, the magnitude of the first load with which the movable part 3 presses the second part 20 is selected to be a magnitude necessary for the O-ring 12 of the first part 10 to be crushed.

次に、ねじ部の噛み合わせ段階では、図5に示す第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が当接する位置から、第一部品10の雄ねじ部11の入口と第二部品20の雌ねじ部21の入口が一致する位置、すなわち、第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が噛み合った位置まで、チャック6で保持した第二部品20を、第一部品10に関して相対的に回転させる。なお、この時に可動部3が第二部品20を押圧する第二の荷重の大きさは、Oリング12が潰されるのに要するほどの大きさが要求されないので、第一の荷重よりも小さな大きさが選択されている。   Next, in the meshing stage of the threaded portion, from the position where the male threaded portion 11 of the first component 10 and the female threaded portion 21 of the second component 20 shown in FIG. The second part 20 held by the chuck 6 is moved to a position where the inlets of the female screw parts 21 of the two parts 20 coincide, that is, a position where the male screw part 11 of the first part 10 and the female screw part 21 of the second part 20 mesh with each other. Rotate relative to the first part 10. At this time, the magnitude of the second load with which the movable part 3 presses the second component 20 is not required to be large enough to crush the O-ring 12, and is smaller than the first load. Is selected.

最後に、ねじ締め付け段階では、第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が噛み合った位置から、第一部品10の雄ねじ部11と第二部品20の雌ねじ部21が係合した図6に示す位置まで、チャック6で保持した第二部品20を、第一部品10に関して相対的に回転させる。なお、この時に可動部3が第二部品20を押圧する第三の荷重の大きさは、ねじ締めによる回転方向の力が第一部品10と第二部品20を近づける力に変換されるので、第二の荷重よりも小さくてもよい。このように、ねじ部の噛み合わせ段階とねじ締め付け段階では、圧入段階中の押圧荷重よりも小さな押圧荷重で、第一部品10と第二部品20を相対的に回転させることができるので、確実に第一部品10と第二部品20を圧入状態でねじ締め付けすることができる。   Finally, in the screw tightening stage, the male screw portion 11 of the first component 10 and the female screw portion 21 of the second component 20 are engaged from the position where the male screw portion 11 of the first component 10 and the female screw portion 21 of the second component 20 are engaged with each other. The second part 20 held by the chuck 6 is rotated relative to the first part 10 to the position shown in FIG. In addition, since the magnitude | size of the 3rd load in which the movable part 3 presses the 2nd component 20 at this time is converted into the force in which the force of the rotation direction by screw fastening brings the 1st component 10 and the 2nd component 20 close, It may be smaller than the second load. In this way, the first part 10 and the second part 20 can be relatively rotated with a pressing load smaller than the pressing load during the press-fitting stage in the meshing stage and the screw tightening stage of the screw portion. In addition, the first component 10 and the second component 20 can be screwed in a press-fitted state.

なお、上記の段階における押圧荷重は、第二の荷重の大きさは、第一の荷重の大きさの約2分の1であり、第三の荷重の大きさは、第一の荷重の大きさの約3分の1であると好ましい。   The pressing load at the above stage is such that the magnitude of the second load is about one half of the magnitude of the first load, and the magnitude of the third load is the magnitude of the first load. It is preferable that it is about one third.

また、不動の第一部品10と、チャック6で保持する第二部品20の形態は、逆であってもよい。   Further, the forms of the stationary first component 10 and the second component 20 held by the chuck 6 may be reversed.

本発明のねじ締め付け方法で用いるねじ締め付け装置を示す全体図である。It is a general view which shows the screw fastening apparatus used with the screw fastening method of this invention. 本発明のねじ締め付け方法で用いる用いる第一部品と第二部品の部分断面図である。It is a fragmentary sectional view of the 1st component used with the screw fastening method of the present invention, and the 2nd component. 第一部品のOリングが第二部品に触れていない状態を示す図である。It is a figure showing the state where the O-ring of the first part does not touch the second part. 第一部品のOリングが潰されて第二部品の内周面に当接している状態を示す図である。It is a figure which shows the state which O-ring of 1st components is crushed and is contact | abutting to the internal peripheral surface of 2nd components. 第一部品の雄ねじ部と第二部品の雌ねじ部が当接する状態を示す図である。It is a figure which shows the state which the external thread part of a 1st component and the internal thread part of a 2nd part contact | abut. 第一部品の雄ねじ部と第二部品の雌ねじ部が係合した状態を示す図である。It is a figure which shows the state which the external thread part of the 1st part and the internal thread part of the 2nd part engaged. 従来のねじ締め付け装置を示す全体図である。It is a general view which shows the conventional screw fastening apparatus.

符号の説明Explanation of symbols

10…第一部品
11…第一部品のねじ部
20…第二部品
21…第二部品のねじ部
DESCRIPTION OF SYMBOLS 10 ... 1st part 11 ... Thread part 20 of 1st part ... 2nd part 21 ... Thread part of 2nd part

Claims (2)

ねじ部を有する第一部品と、前記ねじ部と係合するねじ部を有する第二部品を圧入状態でねじ締め付けする方法において、
前記第一部品と前記第二部品を第一の荷重で互いに向けて押圧することにより、前記第一部品と前記第二部品を一定の相対距離まで圧入する段階と、
前記第一部品と前記第二部品を、前記第一の荷重よりも小さな第二の荷重で互いに向けて押圧しつつ、前記第一部品と前記第二部品を相対的に回転させることにより、前記第一部品のねじ部と前記第二部品のねじ部を噛み合わせる段階と、
前記第一部品と前記第二部品を、前記第二の荷重よりも小さな第三の荷重で互いに向けて押圧しつつ、前記第一部品と前記第二部品をさらに相対的に回転させることにより、前記第一部品と前記第二部品をねじ締めする段階とを備えていることを特徴とするねじ締め付けする方法。
In a method of screw tightening a first part having a threaded part and a second part having a threaded part engaged with the threaded part in a press-fit state,
Pressing the first part and the second part to a certain relative distance by pressing the first part and the second part toward each other with a first load;
By relatively rotating the first part and the second part while pressing the first part and the second part toward each other with a second load smaller than the first load, Meshing the threaded part of the first part and the threaded part of the second part;
By further rotating the first part and the second part while pressing the first part and the second part toward each other with a third load smaller than the second load, A screw tightening method comprising: screwing the first part and the second part.
前記第二の荷重の大きさは、前記第一の荷重の大きさの約2分の1であり、前記第三の荷重の大きさは、前記第一の荷重の大きさの約3分の1であることを特徴とする請求項1に記載のねじ締め付けする方法。   The magnitude of the second load is about one half of the magnitude of the first load, and the magnitude of the third load is about 3 minutes of the magnitude of the first load. The screw tightening method according to claim 1, wherein the method is one.
JP2004156413A 2004-05-26 2004-05-26 Screw tightening method Expired - Fee Related JP4135678B2 (en)

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