JP2016078182A - Grinding method of screw shaft and grinder of screw shaft - Google Patents

Grinding method of screw shaft and grinder of screw shaft Download PDF

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JP2016078182A
JP2016078182A JP2014213034A JP2014213034A JP2016078182A JP 2016078182 A JP2016078182 A JP 2016078182A JP 2014213034 A JP2014213034 A JP 2014213034A JP 2014213034 A JP2014213034 A JP 2014213034A JP 2016078182 A JP2016078182 A JP 2016078182A
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screw shaft
grinding
amount
contraction
expansion
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JP2016078182A5 (en
JP6446992B2 (en
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池田　裕之
Hiroyuki Ikeda
裕之 池田
裕章 藤代
Hiroaki Fujishiro
裕章 藤代
桑野　孝史
Takashi Kuwano
孝史 桑野
慎吾 松尾
Shingo Matsuo
慎吾 松尾
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NSK Ltd
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Priority to PCT/JP2015/078455 priority patent/WO2016060036A1/en
Priority to TW104133358A priority patent/TW201622856A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/36—Thread cutting; Automatic machines specially designed therefor by grinding
    • B23G1/38—Thread cutting; Automatic machines specially designed therefor by grinding with grinding discs guided along the workpiece in accordance with the pitch of the required thread
    • 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
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
    • B23Q15/18—Compensation of tool-deflection due to temperature or force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Control Of Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a grinding method or the like of a screw shaft which can accurately formed two threads or more of thread grooves.SOLUTION: In a grinding method of a screw shaft which performs grinding by moving the screw shaft 10 contacting with an abrasive wheel 5 to an axial direction by a moving amount while rotating it, in order to form n-threads of thread grooves, the first thread groove is formed by: a first process for detecting an elongation/contraction amount of the screw shaft 10, and correcting the moving amount of the screw shaft 10 on the basis of the detection; a second process for correcting a grinding start position on the basis of the elongation/contraction amount which is detected in the first process; and a third process for performing grinding by moving the screw shaft 10 by the moving amount which is corrected in the first process. The second and subsequent thread grooves are formed by a fourth process for changing the grinding start position by rotating the screw shaft 10 by 360/n, and by the first to third processes.SELECTED DRAWING: Figure 1

Description

本発明は、ねじ軸の研削方法、ねじ軸の研削装置に関する。   The present invention relates to a screw shaft grinding method and a screw shaft grinding apparatus.

従来、ねじ軸を研削してねじ溝を形成するための研削装置として、研削による発熱でねじ軸が伸縮変形しても研削精度を良好に保つことを目的としたものが提案されている（例えば、特許文献１を参照。）。   Conventionally, as a grinding apparatus for grinding a screw shaft to form a screw groove, a device for the purpose of maintaining good grinding accuracy even if the screw shaft expands or contracts due to heat generated by grinding has been proposed (for example, , See Patent Document 1).

特許第３７００２５５号公報Japanese Patent No. 3700255

しかしながら、上述のような従来の研削装置は２条以上のねじ溝を形成することについて考慮されていなかった。   However, the conventional grinding apparatus as described above has not been considered for forming two or more thread grooves.

そこで本発明は上記問題点に鑑みてなされたものであり、２条以上のねじ溝を高精度に形成可能なねじ軸の研削方法及び研削装置を提供することを目的とする。   Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a screw shaft grinding method and a grinding apparatus capable of forming two or more thread grooves with high accuracy.

上記課題を解決するために本発明は、
砥石車に接触させたねじ軸を回転させながら軸方向へ所定の移動量だけ移動させることで研削を行うねじ軸の研削方法において、
ｎ条のねじ溝を形成するために、１条目のねじ溝を、
前記ねじ軸の伸縮量を検出し、前記伸縮量に基づいて前記ねじ軸の移動量を補正する第１工程と、
前記第１工程で検出した前記伸縮量に基づいて研削開始位置を補正する第２工程と、
前記ねじ軸を前記第１工程で補正した移動量だけ移動させて研削を行う第３工程とにより形成し、
２条目以降のねじ溝を、
前記ねじ軸を３６０／ｎ度だけ回転させて研削開始位置を変更する第４工程と、
前記第１〜３工程とにより形成することを特徴とするねじ軸の研削方法を提供する。 In order to solve the above problems, the present invention
In the grinding method of the screw shaft that performs grinding by moving the screw shaft in contact with the grinding wheel by a predetermined movement amount while rotating the screw shaft,
In order to form an n-thread thread groove,
A first step of detecting an amount of expansion and contraction of the screw shaft, and correcting a movement amount of the screw shaft based on the amount of expansion and contraction;
A second step of correcting the grinding start position based on the amount of expansion / contraction detected in the first step;
A third step of grinding by moving the screw shaft by the movement amount corrected in the first step;
The second and subsequent thread grooves
A fourth step of changing the grinding start position by rotating the screw shaft by 360 / n degrees;
Provided is a screw shaft grinding method characterized by forming the first through third steps.

また本発明は、
砥石車に接触させたねじ軸を回転させながら軸方向へ所定の移動量だけ移動させることで研削を行うねじ軸の研削装置において、
前記ねじ軸の伸縮量を検出する検出器と、
前記ねじ軸の移動と回転を制御するＮＣ装置とを有し、
前記ＮＣ装置は、ｎ条のねじ溝を形成するために、１条目のねじ溝の研削を、前記伸縮量に基づいて前記ねじ軸の移動量を補正し、前記伸縮量に基づいて研削開始位置を補正し、前記ねじ軸を補正した移動量だけ移動させて行い、２条目以降のねじ溝の研削を、前記ねじ軸を３６０／ｎ度だけ回転させて研削開始位置を変更し、前記１条目のねじ溝の研削と同様に行うことを特徴とするねじ軸の研削装置を提供する。 The present invention also provides
In a screw shaft grinding apparatus that performs grinding by moving a predetermined amount of movement in the axial direction while rotating the screw shaft in contact with the grinding wheel,
A detector for detecting the amount of expansion and contraction of the screw shaft;
An NC device for controlling the movement and rotation of the screw shaft;
The NC device corrects the amount of movement of the screw shaft based on the amount of expansion / contraction and forms a grinding start position based on the amount of expansion / contraction, in order to form an n number of screw grooves. And the screw shaft is moved by the corrected amount of movement, and grinding of the thread groove after the second thread is performed by rotating the screw shaft by 360 / n degrees to change the grinding start position. A screw shaft grinding apparatus is provided which is performed in the same manner as the thread groove grinding.

本発明によれば、２条以上のねじ溝を高精度に形成可能なねじ軸の研削方法及び研削装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the grinding method and grinding apparatus of the screw shaft which can form two or more thread grooves with high precision can be provided.

図１（ａ）は本発明の実施形態に係るねじ軸の研削装置を示す概略図であり、図１（ｂ）はねじ軸が伸びた様子を示す図１（ａ）の部分拡大図である。FIG. 1A is a schematic view showing a screw shaft grinding apparatus according to an embodiment of the present invention, and FIG. 1B is a partially enlarged view of FIG. 1A showing a state in which the screw shaft is extended. . 図２（ａ）〜図２（ｄ）はねじ軸を研削する様子を示す図である。Fig.2 (a)-FIG.2 (d) are figures which show a mode that a screw shaft is ground. 図３はねじ軸の移動量と累積回転角を示す図である。FIG. 3 is a diagram showing the amount of movement of the screw shaft and the cumulative rotation angle.

はじめに本実施形態に係るねじ軸の研削装置の全体的な構成について図１（ａ）を参照して説明する。
図１（ａ）に本実施形態に係る研削装置１は、円柱状の軸部材の外周面を研削して螺旋状のねじ溝を形成するためのものであり、主軸２、テールストック３、送りテーブル４、砥石車５、検出器６及びＮＣ装置８を備えてなる。 First, an overall configuration of a screw shaft grinding apparatus according to the present embodiment will be described with reference to FIG.
A grinding apparatus 1 according to this embodiment shown in FIG. 1 (a) is for grinding the outer peripheral surface of a cylindrical shaft member to form a helical thread groove. The main shaft 2, tail stock 3, feed A table 4, a grinding wheel 5, a detector 6, and an NC device 8 are provided.

主軸２は、ねじ軸１０の一端をチャック１１を介して支持しかつ伸び拘束するものである。主軸２には、主軸用モータ１２が取り付けられている。主軸用モータ１２の駆動により主軸２とともにねじ軸１０を回転させることができる。   The main shaft 2 supports one end of the screw shaft 10 via the chuck 11 and restrains the expansion. A main shaft motor 12 is attached to the main shaft 2. The screw shaft 10 can be rotated together with the main shaft 2 by driving the main shaft motor 12.

テールストック３は、主軸２に対峙してねじ軸１０の他端を支持するものである。詳細には、ばね１３でねじ軸１０側へ付勢された心押しセンタ１４をねじ軸１０の端面に設けられた不図示のセンタ穴に押し付けることによってねじ軸１０を支持している。この構成により、研削時の発熱により長手方向へ伸縮変形するねじ軸１０を安定して支持することができる。以下、ねじ軸１０の長手方向（図１（ａ）の左右方向）を単に「軸方向」という。   The tail stock 3 is opposed to the main shaft 2 and supports the other end of the screw shaft 10. Specifically, the screw shaft 10 is supported by pressing a center pushing center 14 urged toward the screw shaft 10 by a spring 13 into a center hole (not shown) provided on the end surface of the screw shaft 10. With this configuration, the screw shaft 10 that expands and contracts in the longitudinal direction due to heat generated during grinding can be stably supported. Hereinafter, the longitudinal direction of the screw shaft 10 (left-right direction in FIG. 1A) is simply referred to as “axial direction”.

送りテーブル４は、主軸２、主軸用モータ１２及びテールストック３を載置するものである。送りテーブル４は、ナット１５と送りねじ１６を介して送りテーブル用モータ１７と連結されている。送りテーブル用モータ１７の駆動により主軸用モータ１２、テールストック３及びこれらに支持されたねじ軸１０を軸方向へ一体的に移動させることができる。   The feed table 4 is used to place the main shaft 2, main shaft motor 12, and tailstock 3. The feed table 4 is connected to a feed table motor 17 via a nut 15 and a feed screw 16. By driving the feed table motor 17, the main shaft motor 12, the tail stock 3, and the screw shaft 10 supported by them can be moved integrally in the axial direction.

砥石車５は、円盤形の砥石を回転させながらねじ軸１０に押し付けることでねじ軸１０を研削するものである（砥石車５の本体は不図示）。砥石車５の軸方向位置は、送りテーブル４の軸方向位置にかかわらず常に一定である。   The grinding wheel 5 grinds the screw shaft 10 by pressing the disc-shaped grinding wheel against the screw shaft 10 while rotating it (the main body of the grinding wheel 5 is not shown). The axial position of the grinding wheel 5 is always constant regardless of the axial position of the feed table 4.

検出器６は、心押しセンタ１４の移動に基づいてねじ軸１０の伸縮量を検出するものである（図１（ｂ）を参照。）。検出器６はテールストック３上に配置されている。   The detector 6 detects the amount of expansion and contraction of the screw shaft 10 based on the movement of the tailstock center 14 (see FIG. 1B). The detector 6 is arranged on the tailstock 3.

ＮＣ（Numerical Control）装置８は、検出器６の出力に基づいて主軸用モータ１２及び送りテーブル用モータ１７の駆動を制御するものである。   An NC (Numerical Control) device 8 controls the driving of the spindle motor 12 and the feed table motor 17 based on the output of the detector 6.

上記構成の本実施形態に係る研削装置１は、以下の動作手順にしたがってねじ軸１０を研削し２条のねじ溝を形成する。
なお、温度変化によるねじ軸１０の軸方向への伸縮は一様とする。ねじ軸１０の図１（ａ）中の左端は主軸２によって伸び拘束されているため、ねじ軸１０の伸び変形はテールストック３側、即ち図１（ａ）の右方へ向かってするものとする。砥石車５の軸方向における位置は一定で、研削はねじ軸１０のテールストック３側から主軸２側へ向かって行うものとする。主軸２の回転速度と送りテーブル４の移動速度は一定とする。 The grinding apparatus 1 according to the present embodiment having the above-described configuration grinds the screw shaft 10 according to the following operation procedure to form two thread grooves.
In addition, the expansion and contraction in the axial direction of the screw shaft 10 due to the temperature change is made uniform. Since the left end of the screw shaft 10 in FIG. 1 (a) is stretched and restrained by the main shaft 2, the deformation of the screw shaft 10 is directed toward the tail stock 3 side, that is, to the right in FIG. 1 (a). To do. The position of the grinding wheel 5 in the axial direction is constant, and grinding is performed from the tail stock 3 side of the screw shaft 10 toward the main shaft 2 side. The rotational speed of the spindle 2 and the moving speed of the feed table 4 are constant.

ステップＳ１：ＮＣ装置８が砥石車５を回転させるとともに送りテーブル用モータ１７を駆動して送りテーブル４及びねじ軸１０を基準移動量Ｌだけテールストック３側へ移動させる（図２（ａ）を参照。）。また、ＮＣ装置８は送りテーブル用モータ１７に同期するように主軸用モータ１２を駆動して主軸２及びねじ軸１０を回転させる。これにより、ねじ軸１０が砥石車５で研削される。ここで、基準移動量Ｌとは伸縮変形していないねじ軸１０に対して予め定められた送りテーブル４の移動量（ストローク）である。なお、研削後、ＮＣ装置８は送りテーブル用モータ１７を駆動してねじ軸１０を主軸２側へ移動させ、研削を開始した研削開始位置（軸方向における位置及び回転方向における位置）を砥石車５の位置まで戻す。   Step S1: The NC device 8 rotates the grinding wheel 5 and drives the feed table motor 17 to move the feed table 4 and the screw shaft 10 to the tail stock 3 side by the reference movement amount L (FIG. 2A). reference.). The NC device 8 drives the main shaft motor 12 to synchronize with the feed table motor 17 to rotate the main shaft 2 and the screw shaft 10. Thereby, the screw shaft 10 is ground by the grinding wheel 5. Here, the reference movement amount L is a predetermined movement amount (stroke) of the feed table 4 with respect to the screw shaft 10 that is not stretched and deformed. After grinding, the NC device 8 drives the feed table motor 17 to move the screw shaft 10 to the main shaft 2 side, and the grinding start position (position in the axial direction and position in the rotational direction) at which grinding is started is a grinding wheel. Return to position 5.

ステップＳ２：検出器６が心押しセンタ１４の移動量からねじ軸１０の伸縮量ΔＬを検出し（図２（ｂ）を参照。）、アンプ１９を介してＮＣ装置８へ出力する。なお、厳密には伸縮量ΔＬはねじ軸１０全体の伸縮量からねじ溝を形成しないねじ軸１０の両端部分の伸縮量を引いたもの、即ちねじ溝が形成された部分の伸縮量を検出することが研削精度向上のために好ましい。   Step S2: The detector 6 detects the expansion / contraction amount ΔL of the screw shaft 10 from the movement amount of the tailstock center 14 (see FIG. 2B), and outputs it to the NC device 8 via the amplifier 19. Strictly speaking, the expansion / contraction amount ΔL is obtained by subtracting the expansion / contraction amount of both ends of the screw shaft 10 not forming the screw groove from the expansion / contraction amount of the entire screw shaft 10, that is, the expansion / contraction amount of the portion where the screw groove is formed. Is preferable for improving grinding accuracy.

ステップＳ３：ＮＣ装置８が上記ステップＳ２で得られたねじ軸１０の伸縮量ΔＬに基づいて送りテーブル４の移動量Ｌ＋ΔＬを算出する。   Step S3: The NC device 8 calculates the movement amount L + ΔL of the feed table 4 based on the expansion / contraction amount ΔL of the screw shaft 10 obtained in the above step S2.

ステップＳ４：ＮＣ装置８が送りテーブル４を動作させ、ねじ軸１０を上記ステップＳ１の研削開始位置から上記ステップＳ２で得た伸縮量ΔＬだけ伸縮した方向と反対の方向へ移動させる（図２（ｃ）を参照。）。これにより、ねじ軸１０の伸縮によって生じた研削開始位置の軸方向における位置ずれを補正することができる。   Step S4: The NC device 8 operates the feed table 4 to move the screw shaft 10 in the direction opposite to the direction in which the expansion / contraction amount ΔL obtained in Step S2 is expanded / contracted from the grinding start position in Step S1 (FIG. 2). see c)). Thereby, the position shift in the axial direction of the grinding start position caused by the expansion and contraction of the screw shaft 10 can be corrected.

ステップＳ５：ＮＣ装置８が上記ステップＳ１と同様に砥石車５、主軸２及び送りテーブル４を動作させてねじ軸１０の研削を行う。このとき、ＮＣ装置８は送りテーブル４を上記ステップＳ３で得た移動量Ｌ＋ΔＬだけ移動させる（図２（ｄ）を参照。）。   Step S5: The NC device 8 grinds the screw shaft 10 by operating the grinding wheel 5, the main shaft 2 and the feed table 4 in the same manner as in Step S1. At this time, the NC device 8 moves the feed table 4 by the movement amount L + ΔL obtained in step S3 (see FIG. 2D).

ステップＳ６：砥石車５の種類を適宜変更しながらＮＣ装置８が上記ステップＳ２〜Ｓ５を繰り返して実行することにより、ねじ軸１０に粗研削、中粗研削及び仕上げ研削を順に行い、ねじ軸１０に１条目のねじ溝が完成する。   Step S6: The NC apparatus 8 repeatedly executes steps S2 to S5 while appropriately changing the type of the grinding wheel 5, thereby performing rough grinding, medium rough grinding and finish grinding on the screw shaft 10 in order. The first thread groove is completed.

ステップＳ７：ＮＣ装置８が主軸２を動作させ、ねじ軸１０を１８０度だけ回転させる。これにより、ねじ軸１０の２条目のねじ溝の研削開始位置（回転方向における位置）を設定することができる（図３を参照。）。   Step S7: The NC device 8 operates the main shaft 2 and rotates the screw shaft 10 by 180 degrees. Thereby, the grinding start position (position in the rotation direction) of the second thread groove of the screw shaft 10 can be set (see FIG. 3).

ステップＳ８：上記ステップＳ２〜Ｓ６を行う。これにより、ねじ軸１０に２条目のねじ溝が完成する。   Step S8: Steps S2 to S6 are performed. Thereby, the second thread groove is completed on the screw shaft 10.

本実施形態に係る研削装置１は、粗研削、中粗研削、仕上げ研削で発熱量が異なり、これによってねじ軸１０の伸縮量が変化しても、上記ステップＳ１〜Ｓ６によって研削の度にねじ軸１０の伸縮量を検出してこれに合わせてねじ軸１０の移動量と研削開始位置を補正することで、砥石車５の位置を研削開始位置から研削終了位置までねじ溝に一致させることができ、砥石車５がねじ溝に片当りすることを防ぎながら精度良く１条目のねじ溝を形成することができる。また、上記ステップＳ７によって２条目のねじ溝の研削開始位置を設定することで１条目のねじ溝に対して２条目のねじ溝の位相合わせを行い、上記ステップＳ８即ち上記ステップＳ２〜Ｓ６によって１条目のねじ溝と同様の研削を行うことで、１条目のねじ溝に対して位置ずれせずに２条目のねじ溝を高精度に形成することができる。したがって、ピッチ精度の良好な２条のねじ軸１０を実現することができる。   The grinding device 1 according to the present embodiment has a different amount of heat generation in rough grinding, intermediate rough grinding, and finish grinding, and even if the expansion / contraction amount of the screw shaft 10 is changed by this, the steps S1 to S6 are used for screwing at each grinding. By detecting the amount of expansion and contraction of the shaft 10 and correcting the amount of movement of the screw shaft 10 and the grinding start position in accordance with this, the position of the grinding wheel 5 can be matched with the screw groove from the grinding start position to the grinding end position. In addition, the first thread groove can be formed with high accuracy while preventing the grinding wheel 5 from coming into contact with the thread groove. In addition, by setting the grinding start position of the second thread groove in the above step S7, the phase of the second thread groove is aligned with the first thread groove, and the above step S8, that is, the above steps S2 to S6, 1 is performed. By performing the same grinding as the thread groove of the stripe, the second thread groove can be formed with high accuracy without being displaced with respect to the first thread groove. Accordingly, it is possible to realize the two screw shafts 10 with good pitch accuracy.

上記構成により本実施形態に係る研削装置１は、粗研削時の切り込み量を大きくすることができる。また、中粗研削及び仕上げ研削時に砥石車５がねじ溝に片当りすることがなくなり、中粗研削及び仕上げ研削の回数を減らすことができる。また、２条のねじ溝を良好なピッチ精度で研削できる。これらにより、研削能率が向上するため、低コスト化を図ることもできる。   With the above-described configuration, the grinding apparatus 1 according to the present embodiment can increase the cutting amount during rough grinding. In addition, the grinding wheel 5 does not come into contact with the thread groove at the time of medium rough grinding and finish grinding, and the number of times of medium rough grinding and finish grinding can be reduced. Also, the two thread grooves can be ground with good pitch accuracy. As a result, the grinding efficiency is improved, so that the cost can be reduced.

本実施形態では、上述した動作手順のステップＳ１、Ｓ５において、ねじ軸１０の移動と回転の同期は、ねじ軸１０の移動と回転を同時に開始して同時に終了する、即ちねじ軸１０の移動が完了するタイミングまでねじ軸１０を回転させ続けることで行われている。しかしこれに限られず、上記ステップＳ３において、上記ステップＳ５でねじ軸１０を移動量Ｌ＋ΔＬだけ移動させる際にねじ軸１０の移動に回転を同期させるためのねじ軸１０の回転量（累積回転角θという）を算出するようにしてもよい（図３を参照。）。これにより、上記ステップＳ５でねじ軸１０を移動量Ｌ＋ΔＬだけ移動させ、これと同時にねじ軸１０を累積回転角θだけ回転させることで、ねじ軸１０の移動と回転をより精度良く同期させることができ、より高精度にねじ軸１０の研削を行うことができる。なお、ねじ軸１０の移動と回転の同期は、上記ステップＳ５におけるねじ軸１０の移動量Ｌ＋ΔＬに合わせて、ねじ軸１０の回転速度や移動速度を変更することで行うようにしてもよい。   In the present embodiment, in steps S1 and S5 of the operation procedure described above, the synchronization of the movement and rotation of the screw shaft 10 starts and ends simultaneously with the movement and rotation of the screw shaft 10, that is, the movement of the screw shaft 10 is completed. This is done by continuing to rotate the screw shaft 10 until the completion timing. However, the present invention is not limited to this. In step S3, when the screw shaft 10 is moved by the movement amount L + ΔL in step S5, the rotation amount (cumulative rotation angle θ) for synchronizing the rotation with the movement of the screw shaft 10 is determined. May be calculated (see FIG. 3). As a result, the screw shaft 10 is moved by the movement amount L + ΔL in step S5, and at the same time, the screw shaft 10 is rotated by the cumulative rotation angle θ, thereby synchronizing the movement and rotation of the screw shaft 10 with higher accuracy. Thus, the screw shaft 10 can be ground with higher accuracy. Note that the movement and rotation of the screw shaft 10 may be synchronized by changing the rotation speed or movement speed of the screw shaft 10 in accordance with the movement amount L + ΔL of the screw shaft 10 in step S5.

上述した動作手順において、１条目のねじ溝を形成する際にステップＳ２で得たねじ軸１０の伸縮量ΔＬをＮＣ装置８がデータとして蓄積保存し、２条目のねじ溝を形成する際に、ステップＳ３におけるねじ軸１０の移動量Ｌ＋ΔＬの算出及びステップＳ４における研削開始位置の補正に前記データも併せて考慮するようにしてもよい。これにより、より高精度にねじ軸１０の研削を行うことができる。   In the operation procedure described above, the NC device 8 accumulates and stores the expansion / contraction amount ΔL of the screw shaft 10 obtained in step S2 when forming the first thread groove, and when forming the second thread groove, The above data may also be taken into account in the calculation of the movement amount L + ΔL of the screw shaft 10 in step S3 and the correction of the grinding start position in step S4. Thereby, the screw shaft 10 can be ground with higher accuracy.

本実施形態に係る研削装置１は、上記ステップＳ７及びＳ８を繰り返し実行することで、ねじ軸１０に３条以上のねじ溝を形成することもできる。具体的には、ｎ条（ｎは整数）のねじ溝を形成する場合には、上記ステップＳ７で研削開始位置（回転方向における位置）を設定する際に、ねじ軸１０を３６０／ｎ度だけ回転させるようにすればよい（例えば、３条のねじ軸なら１２０度、４条のねじ軸なら９０度回転させる）。これにより、ｎ条のねじ溝の研削を高精度に行うことができる。   The grinding apparatus 1 according to the present embodiment can also form three or more thread grooves on the screw shaft 10 by repeatedly executing steps S7 and S8. Specifically, in the case of forming n threads (n is an integer), when setting the grinding start position (position in the rotation direction) in step S7, the screw shaft 10 is set to 360 / n degrees. What is necessary is just to make it rotate (for example, if it is 3 screw shafts, if it is 4 screw shafts, it will be rotated 90 degrees). As a result, the n-thread groove can be ground with high accuracy.

本実施形態に係る研削装置１では、テールストック３の代わりにねじ軸１０の一端を振止め装置で支持してもよい。この場合、ねじ軸１０端面の不図示のセンタ穴にボール状のフィーラを押し付け、検出器６がフィーラの変位からねじ軸１０の伸縮量を検出する構成とすればよい。   In the grinding device 1 according to the present embodiment, one end of the screw shaft 10 may be supported by a swinging device instead of the tail stock 3. In this case, a ball-like feeler may be pressed against a center hole (not shown) on the end face of the screw shaft 10 so that the detector 6 detects the amount of expansion / contraction of the screw shaft 10 from the displacement of the feeler.

１ 研削装置
２ 主軸
３ テールストック
４ 送りテーブル
５ 砥石車
６ 検出器
８ ＮＣ装置
１０ ねじ軸
１２ 主軸用モータ
１７ 送りテーブル用モータ DESCRIPTION OF SYMBOLS 1 Grinding device 2 Spindle 3 Tailstock 4 Feed table 5 Grinding wheel 6 Detector 8 NC device 10 Screw shaft 12 Spindle motor 17 Feed table motor

Claims (3)

砥石車に接触させたねじ軸を回転させながら軸方向へ所定の移動量だけ移動させることで研削を行うねじ軸の研削方法において、
ｎ条のねじ溝を形成するために、１条目のねじ溝を、
前記ねじ軸の伸縮量を検出し、前記伸縮量に基づいて前記ねじ軸の移動量を補正する第１工程と、
前記第１工程で検出した前記伸縮量に基づいて研削開始位置を補正する第２工程と、
前記ねじ軸を前記第１工程で補正した移動量だけ移動させて研削を行う第３工程とにより形成し、
２条目以降のねじ溝を、
前記ねじ軸を３６０／ｎ度だけ回転させて研削開始位置を変更する第４工程と、
前記第１〜３工程とにより形成することを特徴とするねじ軸の研削方法。 In the grinding method of the screw shaft that performs grinding by moving the screw shaft in contact with the grinding wheel by a predetermined movement amount while rotating the screw shaft,
In order to form an n-thread thread groove,
A first step of detecting an amount of expansion and contraction of the screw shaft, and correcting a movement amount of the screw shaft based on the amount of expansion and contraction;
A second step of correcting the grinding start position based on the amount of expansion / contraction detected in the first step;
A third step of grinding by moving the screw shaft by the movement amount corrected in the first step;
The second and subsequent thread grooves
A fourth step of changing the grinding start position by rotating the screw shaft by 360 / n degrees;
A method for grinding a screw shaft, comprising forming the first through third steps. 前記ねじ軸の一端を伸び拘束として前記各工程を行うことを特徴とする請求項１に記載のねじ軸の研削方法。   The method for grinding a screw shaft according to claim 1, wherein each of the steps is performed with one end of the screw shaft as an elongation constraint. 砥石車に接触させたねじ軸を回転させながら軸方向へ所定の移動量だけ移動させることで研削を行うねじ軸の研削装置において、
前記ねじ軸の伸縮量を検出する検出器と、
前記ねじ軸の移動と回転を制御するＮＣ装置とを有し、
前記ＮＣ装置は、ｎ条のねじ溝を形成するために、１条目のねじ溝の研削を、前記伸縮量に基づいて前記ねじ軸の移動量を補正し、前記伸縮量に基づいて研削開始位置を補正し、前記ねじ軸を補正した移動量だけ移動させて行い、２条目以降のねじ溝の研削を、前記ねじ軸を３６０／ｎ度だけ回転させて研削開始位置を変更し、前記１条目のねじ溝の研削と同様に行うことを特徴とするねじ軸の研削装置。 In a screw shaft grinding apparatus that performs grinding by moving a predetermined amount of movement in the axial direction while rotating the screw shaft in contact with the grinding wheel,
A detector for detecting the amount of expansion and contraction of the screw shaft;
An NC device for controlling the movement and rotation of the screw shaft;
The NC device corrects the amount of movement of the screw shaft based on the amount of expansion / contraction and forms a grinding start position based on the amount of expansion / contraction, in order to form an n number of screw grooves. And the screw shaft is moved by the corrected amount of movement, and grinding of the thread groove after the second thread is performed by rotating the screw shaft by 360 / n degrees to change the grinding start position. The screw shaft grinding apparatus is characterized in that it is performed in the same manner as the thread groove grinding.
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