WO2016060036A1 - ねじ軸の研削方法、ねじ軸の研削装置 - Google Patents

ねじ軸の研削方法、ねじ軸の研削装置 Download PDF

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Publication number
WO2016060036A1
WO2016060036A1 PCT/JP2015/078455 JP2015078455W WO2016060036A1 WO 2016060036 A1 WO2016060036 A1 WO 2016060036A1 JP 2015078455 W JP2015078455 W JP 2015078455W WO 2016060036 A1 WO2016060036 A1 WO 2016060036A1
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WO
WIPO (PCT)
Prior art keywords
screw shaft
grinding
amount
expansion
contraction
Prior art date
Application number
PCT/JP2015/078455
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
池田　裕之
裕章 藤代
桑野　孝史
慎吾 松尾
Original Assignee
日本精工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精工株式会社 filed Critical 日本精工株式会社
Publication of WO2016060036A1 publication Critical patent/WO2016060036A1/ja

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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

Definitions

  • the present invention relates to a screw shaft grinding method and a screw shaft grinding apparatus.
  • 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.
  • 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; A method of grinding a screw shaft, characterized by being formed by the first to third steps.
  • 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.
  • FIG. 1A is a schematic view showing a screw shaft grinding apparatus according to an embodiment of the present invention
  • FIG. 1B is a partially enlarged view of FIG. 1A showing a state in which the screw shaft is extended.
  • 2A to 2D are views showing how the screw shaft is ground.
  • FIG. 3 is a diagram showing the amount of movement of the screw shaft and the cumulative rotation angle.
  • a grinding apparatus 1 according to the present embodiment shown in FIG. 1A is for grinding a peripheral surface of a cylindrical shaft member to form a spiral thread groove, and includes a main shaft 2, a tail stock 3, a feed table 4, A grinding wheel 5, a detector 6, and an NC device 8 are provided.
  • the main shaft 2 holds one end of the screw shaft 10 via the chuck 11 in the direction of the rotation axis, and rotatably holds the main shaft 2 together with the main shaft 2.
  • 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.
  • the tailstock 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.
  • the longitudinal direction of the screw shaft 10, that is, the left-right direction in FIG. 1A is simply referred to as “axial direction”.
  • the feed table 4 is for mounting the spindle 2, the spindle motor 12 and the tailstock 3.
  • the feed table 4 is connected to a feed table motor 17 via a nut 15 fixed to the feed table 4 and a feed screw 16 engaged with the nut 15.
  • the grinding wheel 5 grinds the screw shaft 10 by pressing the disk-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.
  • the detector 6 detects the amount of change in the length of the screw shaft 10, that is, the amount of expansion / contraction based on the movement of the tailstock center 14. See FIG. 1B.
  • the detector 6 is arranged on the tailstock 3.
  • NC (Numerical Control) device 8 controls the drive of spindle motor 12 and feed table motor 17 based on the output of detector 6.
  • the grinding apparatus 1 grinds the screw shaft 10 according to the following operation procedure to form two thread grooves.
  • 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. 1A is constrained in the direction of the rotation shaft by the chuck 11, the extension deformation of the screw shaft 10 is directed toward the tail stock 3, that is, to the right in FIG. 1A. .
  • 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.
  • 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 toward the tail stock 3 by the reference movement amount L. See Figure 2A.
  • 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.
  • the reference movement amount L is a predetermined movement amount of the feed table 4 with respect to the screw shaft 10 that is not stretched and deformed, that is, a stroke.
  • 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 (that is, the position in the axial direction and the position in the rotational direction) at which grinding is started is the grindstone. Return to the position of car 5.
  • Step S2 The detector 6 detects the expansion / contraction amount ⁇ L 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.
  • the expansion / contraction amount ⁇ L 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.
  • Step S3 The NC device 8 calculates the movement amount L + ⁇ L of the feed table 4 based on the expansion / contraction amount ⁇ L of the screw shaft 10 obtained in step S2.
  • Step S4 The NC device 8 operates the feed table 4, and moves the screw shaft 10 in the direction opposite to the direction in which the expansion / contraction amount ⁇ L obtained in Step S2 is expanded / contracted from the grinding start position in Step S1. See Figure 2C. 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.
  • Step S5 The NC device 8 performs grinding of the screw shaft 10 by operating the grinding wheel 5, the spindle 2 and the feed table 4 in the same manner as in the above step S1. At this time, the NC device 8 moves the feed table 4 by the movement amount L + ⁇ L obtained in step S3. See Figure 2D.
  • 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.
  • 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 (that is, the position in the rotation direction) of the second thread groove of the screw shaft 10 can be set. See FIG.
  • Step S8 Steps S2 to S6 are performed. Thereby, the second thread groove is completed on the screw shaft 10.
  • the grinding apparatus 1 has different heating values for rough grinding, intermediate rough grinding, and finish grinding, and even if the expansion / contraction amount of the screw shaft 10 changes thereby, the above-described steps S1 to S6 are used for screwing each time grinding is performed.
  • the position of the grinding wheel 5 can be matched with the screw groove from the grinding start position to the grinding end position.
  • the first thread groove can be formed with high accuracy while preventing the grinding wheel 5 from coming into contact with the thread groove.
  • 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.
  • the grinding apparatus 1 can increase the depth of cut during rough grinding.
  • 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.
  • 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.
  • step S3 when the screw shaft 10 is moved by the movement amount L + ⁇ L in step S5, the rotation amount (cumulative rotation angle ⁇ ) for synchronizing the rotation with the movement of the screw shaft 10 is determined. May be calculated. See FIG.
  • the screw shaft 10 is moved by the movement amount L + ⁇ L in step S5, and at the same time, the screw shaft 10 is rotated by the cumulative rotation angle ⁇ , thereby synchronizing the movement and rotation of the screw shaft 10 with higher accuracy.
  • the screw shaft 10 can be ground with higher accuracy.
  • 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 + ⁇ L of the screw shaft 10 in step S5.
  • the NC device 8 accumulates and stores the expansion / contraction amount ⁇ L 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 + ⁇ L 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.
  • the grinding apparatus 1 can also form three or more thread grooves on the screw shaft 10 by repeatedly executing the above steps S7 and S8. Specifically, in the case of forming n threads (n is an integer), when setting the grinding start position (that is, the position in the rotation direction) in step S7, the screw shaft 10 is rotated around the axis center. And 360 / n degrees. For example, if it is a three-thread screw shaft, it is rotated 90 degrees. As a result, the n-thread groove can be ground with high accuracy.
  • one end of the screw shaft 10 may be supported by a swinging device instead of the tail stock 3.
  • 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.

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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)
PCT/JP2015/078455 2014-10-17 2015-10-07 ねじ軸の研削方法、ねじ軸の研削装置 WO2016060036A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-213034 2014-10-17
JP2014213034A JP6446992B2 (ja) 2014-10-17 2014-10-17 ねじ軸の研削方法、ねじ軸の研削装置、ねじ軸の製造方法

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JP (1) JP6446992B2 (enrdf_load_stackoverflow)
TW (1) TW201622856A (enrdf_load_stackoverflow)
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JP2018012151A (ja) * 2016-07-20 2018-01-25 株式会社ジェイテクト ウォームの製造方法
CN109834346B (zh) * 2017-11-24 2020-11-27 株式会社三信 滚珠丝杠研磨方法及其装置
CN112775446B (zh) * 2020-12-15 2022-08-26 大连德迈仕精密科技股份有限公司 一种螺杆轴零件的螺纹倒角装置与工艺方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60228019A (ja) * 1984-04-23 1985-11-13 Yamazaki Mazak Corp 数値制御旋盤における多条ねじの切削制御方法
JP3700255B2 (ja) * 1996-06-04 2005-09-28 日本精工株式会社 ねじ軸研削方法およびねじ軸の伸縮補正研削装置
WO2014129314A1 (ja) * 2013-02-20 2014-08-28 日本精工株式会社 ねじ部の加工方法および加工装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728823A (en) * 1970-05-05 1973-04-24 Toyoda Machine Works Ltd Thread grinding machine
JPH0710481B2 (ja) * 1986-04-01 1995-02-08 株式会社不二越 Ｎｃブロ−チ研削盤
JP2590531B2 (ja) * 1988-05-20 1997-03-12 日本精工株式会社 ねじ軸有効径のインプロセス測定方法および装置
JPH05189019A (ja) * 1992-01-09 1993-07-30 Toshiba Mach Co Ltd 工作機械の数値制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60228019A (ja) * 1984-04-23 1985-11-13 Yamazaki Mazak Corp 数値制御旋盤における多条ねじの切削制御方法
JP3700255B2 (ja) * 1996-06-04 2005-09-28 日本精工株式会社 ねじ軸研削方法およびねじ軸の伸縮補正研削装置
WO2014129314A1 (ja) * 2013-02-20 2014-08-28 日本精工株式会社 ねじ部の加工方法および加工装置

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TW201622856A (zh) 2016-07-01
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