JP2018163032A - Effective diameter measuring device of ball screw and system - Google Patents

Effective diameter measuring device of ball screw and system Download PDF

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JP2018163032A
JP2018163032A JP2017060232A JP2017060232A JP2018163032A JP 2018163032 A JP2018163032 A JP 2018163032A JP 2017060232 A JP2017060232 A JP 2017060232A JP 2017060232 A JP2017060232 A JP 2017060232A JP 2018163032 A JP2018163032 A JP 2018163032A
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ball screw
effective diameter
screw shaft
floating
probe
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武文 石井
Takefumi Ishii
武文 石井
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Mitsui Seiki Kogyo Co Ltd
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Mitsui Seiki Kogyo Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an effective diameter measuring device which measures an effective diameter of a ball screw shaft continuously and automatically during the process and uniformly over an entire length of a screw shaft.SOLUTION: An effective diameter measuring device of a ball screw includes: a device main body 12; a floating gauge head 14 extending from the device main body; and a probe 16 attached to a top end of the floating gauge head. A floating movement of the floating gauge head to a direction other than a primary direction allows a probe 3 attached to the top end part to move in the primary direction in a three dimensional direction. When the probe is brought into contact with a groove bottom of a screw groove 4 processed to a ball screw shaft 20 which is a process object by the movement in the primary direction, a detection signal is outputted. The detection signal by a contact to a groove interior by the movement other than the primary direction of the probe is cancelled by the floating movement of the floating gauge head.SELECTED DRAWING: Figure 2

Description

本発明は、ボールねじを構成するねじ軸の有効径を測定する装置及びシステムに関し、特に、ねじ研削盤等を用いてボールねじ軸を生産する現場においてボールねじ軸の有効径の変動を加工中に自動的に測定する装置及びシステムに関する。   The present invention relates to an apparatus and system for measuring the effective diameter of a screw shaft that constitutes a ball screw, and in particular, machining the variation of the effective diameter of the ball screw shaft at a site where the ball screw shaft is produced using a screw grinder or the like. The present invention relates to an apparatus and a system for automatically measuring.

ボールねじは、産業機械やロボットなどに用いられる機械要素であり、外周面にねじ溝を有するねじ軸と、内周面にねじ溝を有するナットと、ねじ軸のねじ溝とナットのねじ溝とからなる転動路に収容された多数のボール（通常は鋼球）とを備え、高い動力伝達効率と位置精度とをもって回転運動の直線運動への変換（あるいは、直線運動の回転運動への変換）を行う。即ち、ボールねじは、外周面に所定のリードで螺旋状のボール転動溝が形成されたねじ軸と、内周面にねじ軸側のボール転動溝と対向する螺旋状のボール転動溝を有し、ボールを介してねじ軸に螺合するナット部材とから構成されており、ねじ軸の回転に応じてナット部材がねじ軸の軸方向へ移動するように構成されている。かかるボールねじは、例えば、工作機械の送りテーブル等をミクロン単位で移動させるために用いられるが、その送り精度を確保するために、その製作時には、ボールねじ軸の有効径を測定する必要があり、このための測定方法として、従来、三針法や斜径法等の測定方法が知られている（例えば、特許文献１参照）。 A ball screw is a machine element used in industrial machines, robots, etc., and includes a screw shaft having a thread groove on an outer peripheral surface, a nut having a thread groove on an inner peripheral surface, a screw groove of the screw shaft, and a screw groove of the nut. With a large number of balls (usually steel balls) housed in a rolling path consisting of, and with high power transmission efficiency and positional accuracy, conversion of rotational motion into linear motion (or conversion of linear motion into rotational motion) )I do. That is, the ball screw has a screw shaft in which a spiral ball rolling groove is formed with a predetermined lead on the outer peripheral surface, and a spiral ball rolling groove facing the ball rolling groove on the screw shaft side on the inner peripheral surface. And a nut member that engages with the screw shaft via a ball, and the nut member moves in the axial direction of the screw shaft in accordance with the rotation of the screw shaft. Such a ball screw is used, for example, to move a feed table of a machine tool in units of microns. In order to ensure the feed accuracy, it is necessary to measure the effective diameter of the ball screw shaft at the time of production. As measurement methods for this purpose, measurement methods such as the three-needle method and the oblique diameter method are conventionally known (for example, see Patent Document 1).

実開平２−１３５８０４号公報Japanese Utility Model Publication No. 2-135804

ところで、ねじ軸の外周面に形成されたボール転動溝の有効径の変動を軸全長に亘り厳密に管理する必要がある。仮に、ねじ軸側のボール転動溝の有効径が公差を加味した最小許容寸法よりも小さい場合には、ねじ軸のボール転動溝とこれを転動するボールとの間に隙間が生じ、ナット部材がねじ軸に対してガタついてしまう虞がある。反対に、ねじ軸側のボール転動溝の有効径が公差を加味した最大許容寸法よりも大きい場合には、ボールがボール転動溝の間で過度に押し潰される結果となり、ナット部材に対するねじ軸の回転に過大なトルクが必要となる。こうなると、ねじ使用時に本来同一負荷で静粛に運転できるはずのものが、運転中に過負荷になったり、隙間による振動を発生させるので、ねじの寿命低下や騒音等の不具合を生じる。従って、ねじ軸のボール転動溝の有効径の寸法管理を厳密に行うために、その製造工程において、ボールねじ軸の有効径を連続して正確に測定することができる必要がある。しかしながら、上述した三針法や斜径法等は、ボールねじ軸の有効径をその都度、測定者が把持可能な測定器を用いて手動にて測定するものであり、正確性と連続性の面で十分な測定方法とは言えなかった。即ち、かかる三針法や斜径法による測定作業は、人手（手動）によるため熟練した技能を必要とし、ボールねじ軸の有効径の測定工程を自動化することにより生産性の向上を図ることは困難であった。 By the way, it is necessary to strictly manage the variation of the effective diameter of the ball rolling groove formed on the outer peripheral surface of the screw shaft over the entire length of the shaft. If the effective diameter of the ball rolling groove on the screw shaft side is smaller than the minimum allowable dimension taking into account tolerances, a gap is created between the ball rolling groove of the screw shaft and the ball rolling this, There is a possibility that the nut member may rattle with respect to the screw shaft. On the other hand, if the effective diameter of the ball rolling groove on the screw shaft side is larger than the maximum allowable dimension including the tolerance, the ball will be excessively crushed between the ball rolling grooves, and the screw against the nut member Excessive torque is required to rotate the shaft. In this case, what should be able to operate quietly under the same load when using the screw becomes overloaded during operation or generates vibration due to a gap, resulting in problems such as a reduction in screw life and noise. Therefore, in order to strictly manage the effective diameter of the ball rolling groove of the screw shaft, it is necessary to continuously and accurately measure the effective diameter of the ball screw shaft in the manufacturing process. However, the above-mentioned three-needle method, oblique diameter method, etc., manually measure the effective diameter of the ball screw shaft each time using a measuring instrument that can be grasped by the measurer, and have accuracy and continuity. It was not a sufficient measurement method. In other words, the measurement work by the three-needle method and the oblique diameter method is manual (manual) and requires skilled skills, and it is not possible to improve productivity by automating the measurement process of the effective diameter of the ball screw shaft. It was difficult.

本発明は、以上のような事情から為されたものであり、その目的は、ボールねじ軸を生産する現場においてボールねじ軸の有効径の変動を加工中に連続して自動的に測定することができる測定装置を提供することにある。また、ねじ軸全長にわたる均一な測定が可能な測定装置を提供することにある。 The present invention has been made under the circumstances as described above, and its purpose is to automatically and continuously measure the variation of the effective diameter of the ball screw shaft at the site where the ball screw shaft is produced. An object of the present invention is to provide a measuring apparatus capable of Another object of the present invention is to provide a measuring apparatus that can perform uniform measurement over the entire length of the screw shaft.

上記目的を達成するため、本発明者は、種々検討を重ねた結果、装置本体から伸長するフローティング測定子が１次方向以外の方向で浮遊運動することにより、その先端部に取り付けられたプローブが３次元方向における１次方向に移動可能であり、該１次方向の動きにより加工対象であるボールねじ軸に加工されたねじ溝の溝底に接触した時に検出信号を出力し、前記プローブの前記１次方向以外の動きによる前記ねじ溝内への接触による検出信号は前記フローティング測定子の浮遊運動によりキャンセルすることで、上述したように、ボールねじ軸の有効径の変動を加工中に連続して自動的に測定することができる上に、ねじ軸全長にわたる均一な測定が可能となることを見出した。 In order to achieve the above object, the present inventor has conducted various studies, and as a result, the probe attached to the tip of the floating probe extending from the apparatus body moves in a direction other than the primary direction. A detection signal is output when the probe is movable in a primary direction in a three-dimensional direction and comes into contact with a groove bottom of a thread groove processed on a ball screw shaft to be processed by the movement in the primary direction. As described above, the detection signal due to the contact in the screw groove due to the movement other than the primary direction is canceled by the floating movement of the floating measuring element, so that the variation of the effective diameter of the ball screw shaft is continuously performed during the machining as described above. In addition to being able to measure automatically, it has been found that uniform measurement over the entire length of the screw shaft is possible.

即ち、本発明の第１の様相に係るボールねじの有効径測定装置は、加工対象であるボールねじ軸に加工されたねじ溝の有効径を測定するボールねじの有効径測定装置において、装置本体と、該装置本体から伸長するフローティング測定子と、該フローティング測定子の先端部に取り付けられたプローブとを有し、前記フローティング測定子が１次方向以外の方向で浮遊運動することにより、その先端部に取り付けられたプローブが３次元方向における１次方向に移動可能であり、該１次方向の動きにより加工対象であるボールねじ軸に加工されたねじ溝の溝底に接触した時に検出信号を出力し、前記プローブの前記１次方向以外の動きによる前記ねじ溝内への接触による検出信号は前記フローティング測定子の浮遊運動によりキャンセルするように構成されていることを特徴とする。 That is, the ball screw effective diameter measuring apparatus according to the first aspect of the present invention is a ball screw effective diameter measuring apparatus for measuring an effective diameter of a thread groove formed on a ball screw shaft to be processed. And a floating probe extending from the apparatus main body, and a probe attached to the tip of the floating probe, and the floating probe moves in a direction other than the primary direction, When the probe attached to the part is movable in the primary direction in the three-dimensional direction and contacts the groove bottom of the thread groove processed in the ball screw shaft to be processed by the movement in the primary direction, a detection signal is output. The detection signal generated by the contact with the screw groove due to the movement of the probe in a direction other than the primary direction is canceled by the floating movement of the floating probe. Characterized in that it is configured urchin.

また、本発明の第２の様相に係るボールねじの有効径測定システムは、上記の有効径測定装置を前記加工対象であるボールねじ軸を挟んだ両側に相対向するように対称様に配置し、前記各プローブが前記ボールねじ軸の前記ねじ溝の溝底に接触することにより検出信号を出力することで、前記ボールねじの直径を測定可能に構成されていることを特徴とする。 In the ball screw effective diameter measuring system according to the second aspect of the present invention, the effective diameter measuring device described above is arranged symmetrically so as to face each other across the ball screw shaft to be processed. The probe is configured to be capable of measuring the diameter of the ball screw by outputting a detection signal by contacting each probe with a groove bottom of the screw groove of the ball screw shaft.

本発明によれば、ボールねじ軸を生産する現場においてボールねじ軸の有効径の変動を加工中に連続して自動的に測定することができる測定装置及びシステムを提供することができる。また、ねじ軸全長にわたる均一な測定が可能である。 ADVANTAGE OF THE INVENTION According to this invention, the measuring apparatus and system which can measure automatically the fluctuation | variation of the effective diameter of a ball screw shaft continuously during a process in the field which manufactures a ball screw shaft can be provided. In addition, uniform measurement over the entire length of the screw shaft is possible.

ボールねじ軸の有効径に関する従来の測定方法の問題点を説明するための図であり、（ａ）は、その測定端子（プローブ）が溝形状に適合する場合、（ｂ）は、その測定端子（プローブ）が溝形状に適合しない場合を示す。It is a figure for demonstrating the problem of the conventional measuring method regarding the effective diameter of a ball screw axis, (a) is the measurement terminal (probe), and (b) is the measurement terminal The case where (probe) does not match the groove shape is shown. （ａ）（ｂ）は、本発明の第１の実施形態に係るボールねじの有効径測定装置の基本原理と動作原理を示す第１の図であり、（ａ）は、その有効径測定装置とボールねじ軸を正面側から見た図、（ｂ）は、その有効径測定装置とボールねじ軸を上面側から見た図である。(A) (b) is the 1st figure showing the basic principle and operation principle of the effective diameter measuring device of a ball screw concerning a 1st embodiment of the present invention, and (a) is the effective diameter measuring device. The figure which looked at the ball screw axis from the front side, (b) is the figure which looked at the effective diameter measuring device and the ball screw axis from the upper surface side. （ａ）（ｂ）は、本発明の第１の実施形態に係るボールねじの有効径測定装置の基本原理と動作原理を示す第２の図であり、（ａ）は、その有効径測定装置とボールねじ軸を上面側から見た図、（ｂ）は、その測定時における有効径測定装置のプロ−ブと溝との位置関係を示す図である。(A) (b) is the 2nd figure which shows the basic principle and operation | movement principle of the effective diameter measuring apparatus of the ball screw which concern on the 1st Embodiment of this invention, (a) is the effective diameter measuring apparatus FIG. 5B is a diagram showing the positional relationship between the probe and the groove of the effective diameter measuring device at the time of measurement. 本発明の第１の実施形態に係るボールねじ軸の有効径測定装置をボールねじ軸を加工する研削盤に適用した例を示す図である。It is a figure which shows the example which applied the effective diameter measuring apparatus of the ball screw shaft which concerns on the 1st Embodiment of this invention to the grinding machine which processes a ball screw shaft. 本発明の第１の実施形態に係るボールねじ軸の有効径測定装置を用いた測定方法を示すフロー図である。It is a flowchart which shows the measuring method using the effective diameter measuring apparatus of the ball screw shaft which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係るボールねじの有効径測定システムの基本原理と動作原理を示す図であり、その有効径測定システムとボールねじ軸を正面側から見た図である。It is the figure which shows the basic principle and operation | movement principle of the effective diameter measuring system of the ball screw which concerns on the 2nd Embodiment of this invention, and is the figure which looked at the effective diameter measuring system and the ball screw shaft from the front side.

まず、本発明の理解を容易にするため、ボールねじ軸の有効径に関する従来の測定方法の問題点について説明しておく。図１は、その問題点を説明するための図であり、（ａ）は、従来の三針法等に用いる球形の測定端子（プローブ）が溝形状に適合する場合、（ｂ）は、その測定端子（プローブ）が溝形状に適合しない場合を示す。
例えば、上述した特許文献１記載の従来例では、三針法の針（円筒形直径寸法）に替えて３６０°で感度を有する球形プローブ（球形直径寸法）を用いてボールねじ軸の有効径を測定者が手動にて測定するものである。この場合、図１（ａ）に示すように、球形の測定端子（プローブ）２が溝４の形状に適合する場合には、その溝４の最深部にプローブが接触した時に検出信号が出力されるので、正確な測定が為される。しかしながら、図１（ｂ）に示すように、球形の測定端子（プローブ）２が溝４の形状に適合しない場合には、その溝４の最深部にプローブ２が接触した時ではなく、より浅い位置で溝の側面にプローブ２が接触した時に検出信号が出力されることになるので、結果として正確な測定が為されない。従って、溝４の形状如何とその都度の測定者の手動作業の精度により測定結果が左右されることになり、ボールねじ軸の全長に亘る均一な測定は極めて困難である。 First, in order to facilitate understanding of the present invention, problems of the conventional measuring method relating to the effective diameter of the ball screw shaft will be described. FIG. 1 is a diagram for explaining the problem. FIG. 1A shows a case where a spherical measuring terminal (probe) used in a conventional three-needle method or the like is adapted to a groove shape, and FIG. The case where the measurement terminal (probe) does not conform to the groove shape is shown.
For example, in the conventional example described in Patent Document 1 described above, the effective diameter of the ball screw shaft is set by using a spherical probe (spherical diameter size) having sensitivity at 360 ° instead of the three-needle method needle (cylindrical diameter size). The measurer manually measures. In this case, as shown in FIG. 1A, when the spherical measurement terminal (probe) 2 conforms to the shape of the groove 4, a detection signal is output when the probe contacts the deepest portion of the groove 4. Therefore, an accurate measurement is made. However, as shown in FIG. 1B, when the spherical measurement terminal (probe) 2 does not conform to the shape of the groove 4, it is not when the probe 2 is in contact with the deepest part of the groove 4 but is shallower. Since the detection signal is output when the probe 2 comes into contact with the side surface of the groove at the position, as a result, accurate measurement cannot be performed. Therefore, the measurement result depends on the shape of the groove 4 and the accuracy of the manual operation of the measurer at each time, and uniform measurement over the entire length of the ball screw shaft is extremely difficult.

本発明は、以上に述べた従来例の問題点の解決手段を提供するものであり、その解決手段は、具体的には以下に述べる実施形態として具現化される。そこで、まず本発明の第１の実施形態に係るボールねじの有効径測定装置について述べる。図２（ａ）（ｂ）は、本発明の第１の実施形態に係るボールねじの有効径測定装置の基本原理と動作原理を示す第１の図であり、（ａ）は、その有効径測定装置とボールねじ軸を正面側から見た図、（ｂ）は、その有効径測定装置とボールねじ軸を上面側から見た図である。図３（ａ）（ｂ）は、その基本原理と動作原理を示す第２の図であり、（ａ）は、その有効径測定装置とボールねじ軸を上面側から見た図であい、図２（ｂ）を左に９０度回転させた状態に相当する。（ｂ）は、図３（ａ）の状態において、その測定時における有効径測定装置のプロ−ブと溝との位置関係を示す図である。図２（ａ）（ｂ）に示すように、本発明の第１の実施形態に係るボールねじの有効径測定装置１０は、装置本体１２から伸長するフローティング（浮遊）測定子１４と、そのフローティング（浮遊）測定子１４の先端部に取り付けられた測定球（プローブ）１６とを有している。 The present invention provides means for solving the problems of the conventional examples described above, and the means for solving the problems is specifically embodied as an embodiment described below. Therefore, an effective diameter measuring device for a ball screw according to the first embodiment of the present invention will be described first. 2 (a) and 2 (b) are first views showing the basic principle and operation principle of the ball screw effective diameter measuring apparatus according to the first embodiment of the present invention, and FIG. The figure which looked at the measuring device and the ball screw shaft from the front side, (b) is the figure which looked at the effective diameter measuring device and the ball screw shaft from the upper surface side. 3 (a) and 3 (b) are second views showing the basic principle and operation principle, and FIG. 3 (a) is a view of the effective diameter measuring device and the ball screw shaft as seen from the upper surface side. This corresponds to a state where (b) is rotated 90 degrees to the left. (B) is a figure which shows the positional relationship of the probe and groove | channel of an effective diameter measuring apparatus at the time of the measurement in the state of Fig.3 (a). As shown in FIGS. 2 (a) and 2 (b), an effective diameter measuring device 10 for a ball screw according to a first embodiment of the present invention includes a floating measuring element 14 extending from an apparatus body 12, and its floating. (Floating) It has a measuring ball (probe) 16 attached to the tip of the probe 14.

この有効径測定装置１０において重要な点は、フローティング（浮遊）測定子１４が１次方向以外の方向で浮遊運動することにより、その先端部に取り付けられた測定球（プローブ）１６が３次元方向における１次方向に移動可能であり、該１次方向の動きにより加工対象であるボールねじ軸に加工されたねじ溝４の溝底に接触した時に検出信号を出力し、前記測定球（プローブ）１６の前記１次方向以外の動きによる前記ねじ溝４内への接触による検出信号は前記フローティング（浮遊）測定子１４の浮遊運動によりキャンセルすることである。換言すれば、測定球（プローブ）１６の前記１次方向以外の動きに対しては不感帯が設けられている。ここで、図２（ａ）において、３次元方向を図示のとおり定義した場合、ボールねじの有効径測定装置１０では、装置本体１２から伸長するフローティング（浮遊）測定子１４は、矢印ＳＷで示すように、参照符号１４ａで示す部分を起点に１次の方向（Ｘ方向とする）のみにスイングするように形成されており、このスイングに応じて起点の反対（根本）側が動いた量に対応した検出信号を出力する。 The important point in this effective diameter measuring device 10 is that the floating stylus 14 moves in a floating direction in a direction other than the primary direction, so that the measuring sphere (probe) 16 attached to the tip thereof is in a three-dimensional direction. And a detection signal is output when contacting the groove bottom of the thread groove 4 machined into the ball screw shaft to be machined by the movement in the primary direction, and the measurement ball (probe) The detection signal due to the contact in the screw groove 4 due to the movement of 16 other than the primary direction is canceled by the floating movement of the floating measuring element 14. In other words, a dead zone is provided for the movement of the measurement sphere (probe) 16 other than the primary direction. Here, in FIG. 2A, when the three-dimensional direction is defined as illustrated, in the ball screw effective diameter measuring apparatus 10, the floating measuring element 14 extending from the apparatus main body 12 is indicated by an arrow SW. Thus, it is formed so as to swing only in the primary direction (X direction) starting from the portion indicated by reference numeral 14a, and corresponds to the amount that the opposite (root) side of the starting point moves in response to this swing. Output the detected signal.

図３（ａ）（ｂ）を参照してより詳しく説明する。図３（ａ）において、３次元方向は図示のとおりである。即ち、ボールねじの有効径測定装置１０は、装置本体１２から伸長するフローティング（浮遊）測定子１４は、同図に示すように平行ばね１４ｂ部分を有しており、この平行ばね１４ｂの先端部は、矢印ＺＦで示すように、Ｚ方向にフローティングする。尚、Ｙ方向の変位もＺ方向のフローティングで吸収するようになっている。また、図３（ｂ）において、３次元方向は図示のとおりである。即ち、ボールねじの有効径測定装置１０は、装置本体１２の設定された測定圧により、同図に示すように、溝４内を溝底に向って（Ｘ方向、図では下方向）押し付ける力が働いており、それに加えて上述した平行ばね１４ｂによるＺ方向（図では水平方向）のフローティングがあるので、矢印Ｐで示すように、測定球（プローブ）１６が溝４の底（奥）まで入る（溝にはまる）ようになっている。 This will be described in more detail with reference to FIGS. In FIG. 3A, the three-dimensional direction is as shown. In other words, in the ball screw effective diameter measuring device 10, the floating measuring element 14 extending from the device main body 12 has a parallel spring 14b portion as shown in the figure, and the tip of the parallel spring 14b. Floats in the Z direction as indicated by arrow ZF. The displacement in the Y direction is also absorbed by the floating in the Z direction. In FIG. 3B, the three-dimensional direction is as shown. That is, the effective diameter measuring device 10 of the ball screw presses the inside of the groove 4 toward the groove bottom (X direction, downward in the drawing) as shown in FIG. In addition to this, there is a floating in the Z direction (horizontal direction in the figure) by the parallel spring 14b described above, so that the measurement ball (probe) 16 moves to the bottom (back) of the groove 4 as indicated by an arrow P. It enters (it fits in the groove).

図４は、本発明の第１の実施形態に係るボールねじの有効径測定装置をボールねじ軸を加工する研削盤に適用した例を示す図である。図４に示すように、本発明の第１の実施形態に係るボールねじ軸の有効径測定装置１０は、ワークとしての加工対象であるボールねじ軸２０を加工する研削盤３０と共に用いられる。図４において、ボールねじ軸２０は、前後方向（図４の紙面と直交する方向）に伸長するように把持装置（チャック）３２により保持された状態で、研削盤３０の工具により研削されてボールねじに加工される。そのボールねじ軸２０を所定長さ研削した時点で、図４に示すように、有効径測定装置１０の、装置本体１２が上方から降りてきて、そのフローティング（浮遊）測定子１４と、そのフローティング（浮遊）測定子１４の先端部に取り付けられた測定球（プローブ）１６により、ねじ溝４（図１参照）の最深部にタッチした時点で検出信号を出力し、溝４にならうように計測される。このような測定タイミング等の設定は、研削盤３０の表示画面３８によりオペレータが行うことが可能である。 FIG. 4 is a diagram showing an example in which the ball screw effective diameter measuring apparatus according to the first embodiment of the present invention is applied to a grinding machine for machining a ball screw shaft. As shown in FIG. 4, the ball screw shaft effective diameter measuring apparatus 10 according to the first embodiment of the present invention is used together with a grinding machine 30 that processes a ball screw shaft 20 as a workpiece. In FIG. 4, the ball screw shaft 20 is ground by a tool of a grinding machine 30 while being held by a gripping device (chuck) 32 so as to extend in the front-rear direction (direction orthogonal to the paper surface of FIG. 4). Processed into screws. When the ball screw shaft 20 is ground to a predetermined length, as shown in FIG. 4, the device main body 12 of the effective diameter measuring device 10 descends from above, and the floating measuring element 14 and the floating measuring element 14 are floated. A detection signal is output when the deepest part of the thread groove 4 (see FIG. 1) is touched by the measurement ball (probe) 16 attached to the tip of the (floating) probe 14 so that it follows the groove 4. It is measured. Such setting of measurement timing and the like can be performed by an operator on the display screen 38 of the grinding machine 30.

図５は、本発明の第１の実施形態に係るボールねじの有効径測定装置１０を用いた測定方法を示すフロー図である。まず、ねじ研削の対象である工作物（ワークとしてのボールねじ軸）２０がセットされた（Ｓ４０１）状態で、測定子１４により（Ｓ４０２）リ−ド方向の位置を決め（Ｓ４０３）、径方向測定機１０により径方向を測定する（Ｓ４０４）。ここで、図２（ａ）（ｂ）を参照しつつ上述したように、径方向のみ測定する機構になっている。測定値を表示し（Ｓ４０５）、測定値をねじ研削盤（工作機械）３０の図示しないＮＣ制御部にセットする（Ｓ４０６）。上述した補正値からねじ研削のための切込み量等の補正値を算出し（Ｓ４０７）、この補正値に相当する補正動作を行う（Ｓ４０８）。 FIG. 5 is a flowchart showing a measuring method using the ball screw effective diameter measuring apparatus 10 according to the first embodiment of the present invention. First, in a state where a workpiece (ball screw shaft as a workpiece) 20 to be subjected to screw grinding is set (S401), the measuring element 14 determines the position in the lead direction (S402) (S403), and the radial direction The radial direction is measured by the measuring instrument 10 (S404). Here, as described above with reference to FIGS. 2 (a) and 2 (b), this is a mechanism for measuring only the radial direction. The measured value is displayed (S405), and the measured value is set in an NC control unit (not shown) of the screw grinding machine (machine tool) 30 (S406). A correction value such as a cutting amount for thread grinding is calculated from the correction value described above (S407), and a correction operation corresponding to this correction value is performed (S408).

図６は、本発明の第２の実施形態に係るボールねじの有効径測定システムの基本原理と動作原理を示す図であり、その有効径測定システムとボールねじ軸を正面側から見た図である。図６に示すように、本発明の第２の実施形態に係るボールねじ軸の有効径測定システム２００は、第１の有効径測定部２０１と、第２の有効径測定部２０２とを有しており、測定対象であるボールねじ軸２０を挟んで対称に設けられている。第１の有効径測定部２０１、第２の有効径測定部２０２は、それぞれが上述した第１の実施形態の有効径測定装置１０と同様の構成を有しており、それぞれ測定部本体２１２と、測定部本体２１２から伸長するフローティング（浮遊）測定子２１４と、そのフローティング（浮遊）測定子２１４の先端部に取り付けられた測定球（プローブ）２１６とを有している。この第２の実施形態の有効径測定システム２００において重要な点は、ボールねじ軸２０を挟んでその直径の両側からそれぞれのフローティング（浮遊）測定子１４が１次方向以外の方向で浮遊運動することにより、その先端部に取り付けられた測定球（プローブ）１６が３次元方向における１次方向に移動可能であり、該１次方向の動きにより加工対象であるボールねじ軸に加工されたねじ溝４の溝底に接触した時に検出信号を出力し、前記測定球（プローブ）１６の前記１次方向以外の動きによる前記ねじ溝４内への接触による検出信号は前記フローティング（浮遊）測定子１４の浮遊運動によりキャンセルすることである。換言すれば、測定球（プローブ）１６の前記１次方向以外の動きに対しては不感帯が設けられている。 FIG. 6 is a diagram showing a basic principle and an operating principle of an effective diameter measuring system for a ball screw according to a second embodiment of the present invention, in which the effective diameter measuring system and the ball screw shaft are viewed from the front side. is there. As shown in FIG. 6, the effective diameter measuring system 200 for the ball screw shaft according to the second embodiment of the present invention includes a first effective diameter measuring unit 201 and a second effective diameter measuring unit 202. They are provided symmetrically across the ball screw shaft 20 that is the object of measurement. Each of the first effective diameter measuring unit 201 and the second effective diameter measuring unit 202 has the same configuration as the effective diameter measuring apparatus 10 of the first embodiment described above, The floating measuring element 214 extends from the measuring unit main body 212, and the measuring ball (probe) 216 attached to the tip of the floating measuring element 214. The important point in the effective diameter measuring system 200 of the second embodiment is that each floating measuring element 14 floats in a direction other than the primary direction from both sides of the diameter of the ball screw shaft 20. As a result, the measuring sphere (probe) 16 attached to the tip of the ball can be moved in the primary direction in the three-dimensional direction, and the thread groove formed in the ball screw shaft to be processed by the movement in the primary direction. A detection signal is output when the bottom of the groove 4 is contacted, and the detection signal due to the contact of the measurement ball (probe) 16 in the screw groove 4 due to movement other than the primary direction is the floating measuring element 14. It is to cancel by the floating movement. In other words, a dead zone is provided for the movement of the measurement sphere (probe) 16 other than the primary direction.

本発明によれば、ボールねじ軸を生産する現場においてボールねじ軸の有効径の変動を加工中に連続して自動的に測定することができる測定装置及びシステムを提供することができる。また、ねじ軸全長にわたる均一な測定が可能である。 ADVANTAGE OF THE INVENTION According to this invention, the measuring apparatus and system which can measure automatically the fluctuation | variation of the effective diameter of a ball screw shaft continuously during a process in the field which manufactures a ball screw shaft can be provided. In addition, uniform measurement over the entire length of the screw shaft is possible.

２ 球形の測定端子（プローブ）、 ４ 溝、１０ ボールねじの有効径測定装置、
１２ 装置本体、１４ フローティング（浮遊）測定子、 １６ 測定球（プローブ）、
２０ ボールねじ軸、 ３０ 研削盤、３２ 把持装置（チャック）、３８ 表示画面、
２００ ボールねじ軸の有効径測定システム、２０１ 第１の有効径測定部、
２０２ 第２の有効径測定部、２１２ 測定部本体、
２１４ フローティング（浮遊）測定子、 ２１６ 測定球（プローブ） 2 spherical measuring terminal (probe), 4 groove, 10 ball screw effective diameter measuring device,
12 device body, 14 floating probe, 16 measuring ball (probe),
20 ball screw shaft, 30 grinding machine, 32 gripping device (chuck), 38 display screen,
200 effective diameter measuring system of ball screw shaft, 201 first effective diameter measuring unit,
202 second effective diameter measuring unit, 212 measuring unit body,
214 Floating probe, 216 Measuring ball (probe)

Claims (2)

加工対象であるボールねじ軸に加工されたねじ溝の有効径を測定するボールねじの有効径測定装置において、装置本体と、該装置本体から伸長するフローティング測定子と、該フローティング測定子の先端部に取り付けられたプローブとを有し、前記フローティング測定子が１次方向以外の方向で浮遊運動することにより、その先端部に取り付けられたプローブが３次元方向における１次方向に移動可能であり、該１次方向の動きにより加工対象であるボールねじ軸に加工されたねじ溝の溝底に接触した時に検出信号を出力し、前記プローブの前記１次方向以外の動きによる前記ねじ溝内への接触による検出信号は前記フローティング測定子の浮遊運動によりキャンセルするように構成されていることを特徴とするボールねじの有効径測定装置。 In a ball screw effective diameter measuring device for measuring an effective diameter of a thread groove processed on a ball screw shaft to be processed, an apparatus main body, a floating measuring element extending from the apparatus main body, and a tip of the floating measuring element A probe attached to the tip of the floating probe can be moved in a primary direction in a three-dimensional direction by floating movement in a direction other than the primary direction. A detection signal is output when contact is made with the groove bottom of the thread groove processed on the ball screw shaft to be processed by the movement in the primary direction, and the probe moves into the thread groove due to the movement in the direction other than the primary direction. An effective diameter measuring device for a ball screw characterized in that a detection signal due to contact is canceled by a floating movement of the floating measuring element. . 請求項１記載の有効径測定装置を前記加工対象であるボールねじ軸を挟んだ両側に相対向するように対称様に配置し、前記各プローブが前記ボールねじ軸の前記ねじ溝の溝底に接触することにより検出信号を出力することで、前記ボールねじの直径を測定可能に構成されていることを特徴とするボールねじの有効径測定システム。 The effective diameter measuring device according to claim 1 is arranged symmetrically so as to be opposite to each other across the ball screw shaft to be processed, and each of the probes is placed on a groove bottom of the screw groove of the ball screw shaft. An effective diameter measuring system for a ball screw, wherein the ball screw has a configuration capable of measuring a diameter of the ball screw by outputting a detection signal by contact.
JP2017060232A 2017-03-24 2017-03-24 Effective diameter measuring device of ball screw and system Pending JP2018163032A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021117061A (en) * 2020-01-23 2021-08-10 三井精機工業株式会社 Effective diameter measuring system for ball system and machining device comprising the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021117061A (en) * 2020-01-23 2021-08-10 三井精機工業株式会社 Effective diameter measuring system for ball system and machining device comprising the same
JP7467132B2 (en) 2020-01-23 2024-04-15 三井精機工業株式会社 Ball screw effective diameter distribution calculation system and machining device including said system

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