JP6044905B2 - Ball screw polishing method and apparatus - Google Patents

Description

  The present invention relates to a ball screw polishing method and apparatus used for polishing a ball groove of a screw shaft of a ball screw with a polishing tape.

  2. Description of the Related Art Conventionally, as this type of ball screw polishing apparatus, there is known a structure in which surface finishing is performed by buffing a ball groove of a screw shaft of a ball screw composed of elements of a screw shaft, a nut, and a ball with a buff brush.

JP 2006-22848

  However, in the case of this conventional structure, although the ball groove of the screw shaft of the ball screw is a groove on which the ball rolls, there is a disadvantage that a good surface roughness may not always be obtained. .

  The present invention aims to solve such disadvantages. Among the present inventions, the method according to the first aspect of the present invention is a method for polishing the ball groove of the screw shaft of the ball screw with an abrasive tape. A tape transfer mechanism for transferring the polishing tape continuously or intermittently, and the polishing tape is folded and guided by the outer peripheral surface of the pressure contact roll, and the polishing tape is pressed against the ball groove of the screw shaft by the outer peripheral surface of the pressure contact roll. A tape press-contacting mechanism, a tilting mechanism that tilts and arranges the rotation axis of the press-contacting roll corresponding to the lead angle of the ball groove, and a linear shaking mechanism that linearly swings the pressing roll in the direction of the rotation axis. Three sets of tape heads are arranged at approximately three equally spaced positions in the circumferential direction of the screw shaft, the screw shaft is rotatably held and rotated around the axis, and each of the three sets of tape heads Polishing tape Are transferred continuously or intermittently, and the respective polishing tapes of the three sets of tape heads are guided back by the outer peripheral surface of the pressure contact roll, and the polishing tape is guided by the outer peripheral surface of the pressure contact roll to the ball groove of the screw shaft. The rotation axis of each press roll is inclined according to the lead angle of the ball groove, and each press roll is linearly swung in the direction of the rotary axis, and Each polishing tape is moved in the axial direction of the screw shaft, and the rotation speed of the screw shaft and the movement speed of each polishing tape are synchronized with the lead of the ball groove, and the rotation of the screw shaft and the polishing are performed. Each polishing tape of the three sets of tape heads is attached to the screw shaft with a combined operation of the transfer of the tape and the linear vibration operation and the movement of each polishing tape synchronized with the rotational speed of the screw shaft. From the radial direction toward the axis of the screw shaft In a ball screw polishing method characterized by simultaneously grinding the ball grooves in each abrasive tape pressed against the Lumpur groove.

  According to a second aspect of the present invention, there is provided a holding mechanism for rotatably holding a screw shaft of a ball screw, a rotating mechanism for rotating the screw shaft around the axis, and the polishing tape continuously or intermittently. A tape transfer mechanism for transferring the tape, a tape pressure contact mechanism for guiding the polishing tape to be folded and transferred by the outer peripheral surface of the pressure contact roll, and pressing the abrasive tape to the ball groove of the screw shaft on the outer peripheral surface of the pressure contact roll, the pressure contact roll A tape head unit comprising a tilting mechanism for tilting the rotation axis of the ball groove in correspondence with the lead angle of the ball groove, and a linear swinging mechanism for linearly swinging the pressure contact roll in the direction of the rotation axis, and the tape head unit A tape head moving mechanism for moving in the axial direction of the screw shaft; and a speed synchronizing means for synchronizing the rotational speed of the screw shaft and the moving speed of the polishing tape in correspondence with the lead of the ball groove. Three sets of the tape head portions are arranged at substantially equal positions in the circumferential direction of the screw shaft, and the polishing tape of each tape head portion is directed from the radial direction of the screw shaft toward the axis of the screw shaft. The ball screw polishing apparatus is characterized in that the ball groove is simultaneously pressed with each polishing tape while being pressed against the ball groove.

  According to a third aspect of the present invention, the linear vibration mechanism comprises an eccentric mechanism that linearly swings the pressure contact roll in the rotational axis direction. According to the present invention, as the speed synchronization means, a rotation control motor for rotating the screw shaft, a movement control motor for moving the polishing tape, a rotation speed of the rotation control motor, and a rotation speed of the movement control motor The ball screw polishing apparatus according to claim 2, further comprising a synchronization control unit that controls the synchronization with the ball screw polishing apparatus.

  As described above, according to the present invention, the screw shaft of the ball screw is rotatably held by the holding mechanism, and the screw shaft is rotated about the axis by the rotating mechanism. Each polishing tape of the tape head part is continuously or intermittently transferred by a tape transfer mechanism, and each polishing tape is turned back and guided by the outer peripheral surface of the press contact roll by the tape press contact mechanism, and each polishing tape is guided to the outer peripheral surface of the press contact roll. The pressure axis is pressed against the ball groove of the screw shaft, the rotation axis of the pressure roll is inclined according to the lead angle of the ball groove by the tilt mechanism, and the pressure roll is linearly swung in the direction of the rotation axis by the linear vibration mechanism. Each polishing tape is moved in the axial direction of the screw shaft by the tape head moving mechanism, and the rotational speed of the screw shaft and the moving speed of each polishing tape are corresponding to the ball groove lead by the speed synchronization means. Each of the three sets of tape heads is synchronized with the combined operation of the rotation of the screw shaft, the transfer of the polishing tape and the linear vibration operation, and the movement of the polishing tape synchronized with the rotation speed of the screw shaft. The polishing tape is pressed against the ball groove from the radial direction of the screw shaft toward the axis of the screw shaft, and the ball groove can be polished with the polishing tape. The polishing tape is moved by the movement of the polishing tape in synchronization with the rotation speed of the screw shaft. The polishing tape is securely pressed into contact with the ball groove by the tape pressing mechanism by moving in accordance with the lead of the ball groove, and the ball is moved with the polishing tape by continuous or intermittent transfer of the polishing tape and linear movement of the polishing tape. The grooves can be reliably polished, and each polishing tape of the three sets of tape heads is pressed against the ball groove from the radial direction of the screw shaft toward the axis of the screw shaft, and the ball groove is simultaneously used with each polishing tape. It can polish, can suppress the axial run-out of the axis of the screw shaft due to the pressure contact of the polishing tape, can improve the polishing accuracy, can improve the surface roughness of the ball groove, and polish the ball groove Workability can be improved.

  In the invention of claim 3, since the linear vibration mechanism comprises an eccentric mechanism that linearly swings the pressure contact roll in the rotation axis direction, the structure can be simplified. In the invention according to claim 4, as the speed synchronization means, a rotation control motor for rotating the screw shaft, a movement control motor for moving the polishing tape, and the rotation speed and movement of the rotation control motor Since it comprises a synchronous control unit that synchronously controls the rotational speed of the control motor, the rotational speed of the screw shaft and the moving speed of the polishing tape can be synchronized with the lead of the ball groove, and the polishing tape can be synchronized with the ball groove. It can be surely moved in contact with the lead, the structure can be simplified, and the polishing accuracy can be improved.

1 is an overall plan view of an example embodiment of the present invention. 1 is an overall front view of an embodiment of the present invention. It is a partial side view of the embodiment of the present invention. It is a partial enlarged plan view of an example of an embodiment of the invention. It is a partial expanded side view of the embodiment of the present invention. It is a partial expanded plane sectional view of an example of an embodiment of the invention. It is a partial expanded side sectional view of an example of an embodiment of the invention. It is a fragmentary sectional side view of the example of an embodiment of the invention. It is a fragmentary sectional side view of the example of an embodiment of the invention. It is a partial front view of the embodiment of the present invention. It is an explanation partial top view of an example of an embodiment of the invention. It is an explanation enlarged plan view of an embodiment of the present invention. It is an explanation expansion side sectional view of an example of an embodiment of the invention.

FIG. 1 to FIG. 13 show an embodiment of the present invention. In this case, roughly, as shown in FIG. 1, FIG. 2, FIG. 3, FIG. A holding mechanism 1 for holding, a rotating mechanism 2 for rotating the screw shaft W around the axis W ₁ , a tape transfer mechanism 3 for transferring the polishing tape T continuously or intermittently T ₁ , and rotating the polishing tape T R ₂ freely pressing roll R tape pressing mechanism 4 is pressed against the ball groove B of the screw shaft W of the abrasive tape T to fold movement guide in the outer peripheral surface of the press roll R by the outer peripheral surface of the ball axis of rotation R ₁ of the press rolls R A tape head unit 7 including a tilting mechanism 5 that tilts and arranges in accordance with the lead angle θ of the groove B, and a linear shaking mechanism 6 that linearly shakes the pressing roller R in the direction of the rotation axis R ₁ , and a polishing tape T. Te for moving in the axial W ₁ direction of the screw shaft W The head moving mechanism 8, the rotational speed Q of the screw shaft W, and the moving speed F of the polishing tape T are set to the lead L of the ball groove B (the distance that the nut moves in the axial direction when the screw shaft W makes one revolution). The tape head section 7 is composed of three sets of tape head sections 7, 7, and 7, and the three sets of tape head sections 7, 7, and 7 are configured as described above. It arrange | positions in the circumferential direction substantially three equal position of the screw shaft W, arrange | positions in FIG. Is pressed against the ball groove B from the radial direction of the screw shaft W toward the axis W ₁ of the screw shaft W, and the ball groove B is simultaneously polished with each of the polishing tapes T, T, and T.

  In this case, in the holding mechanism 1 and the rotating mechanism 2, as shown in FIGS. 1 and 2, a holding base 1b is erected on the body 1a, and one end portion of the screw shaft W of the ball screw is provided on the holding base 1b. A chuck 1c that can be attached and detached is disposed, and a core push stand 1d that can rotate and hold the other end of the screw shaft W is disposed, and the screw shaft W is rotated by rotating the chuck 1c by a control motor 2a for rotation. It is configured to make it.

  In this case, as shown in FIG. 3, the three sets of tape head portions 7, 7, 7 are arranged on a single movable base base K at substantially the same three-way positions in the circumferential direction of the screw shaft W.

In this case, in each of the tape transfer mechanisms 3, as shown in FIGS. 1, 2, 3, 4, and 5, an unused polishing tape is mounted on the mounting base 3 a by a pair of support shafts 3 b and 3 b. The full reel 3c and the empty reel 3d wound with T are rotatably arranged, and the polishing tape T unwound from the full reel 3c is wound around the empty reel 3d through the outer peripheral surface of the pressure contact roll R of the tape pressure contact mechanism 4. The full reel 3c is unwound and rotated by the unwinding motor 3e, and the empty reel 3d is wound and rotated by the winding motor 3f, and the full reel 3c, the press roll R, the press roll R, and the above Transfer rolls 3h and 3h and pinching rolls 3i and 3i that are rotated by transfer motors 3g and 3g are arranged between empty reels 3d, and unwinding motor 3e, winding motor 3f, and transfer motor 3g.・ By cooperation of 3g Constitute the abrasive tape T to continuously or intermittently transferred T ₁ relatively low speed from the fully wound reel 3c to an empty reel 3d via the pressure roll R.

  In the tape pressure contact mechanism 4, as shown in FIGS. 4 and 5, a mounting base 4 a is erected on the mounting base 3 a, and the pressure contacting base is connected to the mounting base 4 a via the linear vibration mechanism 6. 4b is disposed, a pair of left and right cylinder mechanisms 4c and 4c are disposed on the pressure contact table 4b, and an advancing / retreating member 4e is disposed orthogonally to the guide shafts 4d and 4d, and a pair of left and right guide rolls 4f and 4f are disposed on the pressure contact table 4b. And a pair of left and right guide rolls 4g and 4g are provided on the advancing / retracting member 4e, and the pressure contact roll R is rotatably disposed at a front intermediate portion of the pair of left and right guide rolls 4g and 4g. 4f and 4f, guide rolls 4g and 4g, and pressure contact roll R are used to guide the return and the cylinder mechanism 4c and 4c are configured to press the polishing tape T against the ball groove B of the screw shaft W on the outer peripheral surface of the pressure contact roll R. There.

  In this case, the polishing tape T has a structure in which a base material such as a polyester film, metal, cloth, or the like is coated or bonded with a predetermined particle size of abrasive particles such as aluminum oxide, chromium oxide, silicon carbide, and diamond.

Further, in this case, the linear vibration mechanism 6 uses an eccentric mechanism 6a as shown in FIGS. 5, 6, 7, and 8, and the mounting base 4a is moved by the sliding portions 6b and 6b. the pressure stage 4b disposed freely Yurafu slide up and down direction intersecting the axis W ₁ direction of the screw shaft W, fitted with a linear oscillating mutabilis motor 6c to mount 4a, the barrel 6d to mount 4a rotatably by bearings, fitted with a main shaft 6e linear oscillating mutabilis motor 6c to barrel 6d, the eccentric shaft portion 6f having an eccentric axis O ₁ of the eccentric amount ε in the barrel 6d to the rotation axis O of the spindle 6e A ball bearing-shaped eccentric ring 6g is rotatably provided on the eccentric shaft portion 6f, a groove-shaped steel-shaped piece member 6h is provided on the press contact base 4b, and the inner surface of the flange-shaped portion of the piece member 6h is eccentric. A pair of opposed contact surfaces 6i and 6i that are in contact with the wheel 6g are formed to drive the linear vibration motor 6c. More eccentric shaft portion 6f, the eccentric 6 g, is configured so as to linearly oscillating oscillation operation Y the press rolls R the rotation axis R ₁ direction in the contact surface 6i · 6i and the sliding portion 6b · 6b of the bridge member 6h.

In the tape head moving mechanism 8, as shown in FIGS. 1 and 2, a moving base 8a is disposed on the machine body 1a, and a sliding base 8c is attached to the moving base 8a by a sliding portion 8b. disposed movably in the axial W ₁ direction of the screw shaft W, attached to the movable base table K in the sliding base 8c, the three mounting surface portion K ₁ · K 1 _· K ₁ is formed in the movable base table K , three each on the mounting surface portion K _{1 ·} K ₁ · K ₁ above three sets of the tape head portion 7, 7, 7 respectively disposed in the circumferential direction approximately three uniformly arranged position of the screw shaft W, the mounting surface portion _{K 1} · K ₁ · K ₁ in via the tilt mechanism 5 for each tape head section 7, 7 and 7 disposed a mounting base 3a of the tape transport mechanism 3, sliding base 8c the screw shaft 8d, The axis of the screw shaft W is applied to the polishing tape T via the slide base 8c by the ball screw mechanism 8f including the nut 8e and the movement control motor 8g. It is configured to move in the W ₁ direction.

Further, in the above tilting mechanism 5, with respect to FIGS. 1, 2, 9, as shown in FIG. 10, the axis W ₁ of the screw shaft W by the fulcrum shaft 5b the ramp 5a on the sliding base 8c It is provided so that it can be tilted and can be fixed at an inclined position by a position fixing mechanism 5e comprising a connecting screw 5c and a mounting nut 5d, and a pressure contact roll R is provided on the inclined table 5a via the tape transfer mechanism 3 and the tape pressure contact mechanism 4. The rotation mechanism 5 is configured so that the rotation axis R ₁ of the pressure contact roll R is inclined and arranged corresponding to the lead angle θ of the ball groove B by the inclination mechanism 5.

  The speed synchronizing means 9 includes a rotation control motor 2a for rotating the screw shaft W, a movement control motor 8g for moving the polishing tape T, and a rotation speed Q of the rotation control motor 2a and a movement control motor. The synchronous control unit 9a synchronously controls the rotational speed of 8g. Although the specific circuit configuration is omitted, the synchronous control unit 9a uses, for example, a personal computer, and the rotational speed Q of the screw shaft W The moving speed F of the polishing tape T is synchronized with the lead L of the ball groove B so as to be synchronized.

Since this embodiment is configured as described above, the screw shaft W of the ball screw is rotatably held by the holding mechanism 1 as shown in FIGS. 1, 2, 5, 10, and 11, and the screw shaft W is It is rotated about the axis W ₁ by the rotary mechanism 2, the abrasive tape T of the three sets of tape head portion 7, 7, 7 transport T ₁ and the tape transport mechanism 3, the tape pressed against the polishing tape T, T-T The mechanism 4 turns and guides by the outer peripheral surface of the press-contacting roll R that can be rotated R ₂ , and presses each polishing tape T, T, T to the ball groove B of the screw shaft W by the outer peripheral surface of the press-contacting roll R. the axis of rotation R ₁ is inclined arranged corresponding to θ lead angle of the ball groove B by tilting mechanism 5, is linearly oscillating oscillation operation Y the press rolls R the rotation axis R ₁ direction by linear Yurafu mechanism 6, a tape head Each polishing tape T ・ T ・ T is moved by moving mechanism 8 Flip is moved in the axial W ₁ axis W, speed synchronization means corresponds to the moving speed F of the rotational speed Q and the abrasive tape T · T · T of the screw shaft W to the lead L of the ball groove B synchronized by 9 10, 11, 12, and 13, the rotation of the screw shaft W, the transfer T ₁ and the linear vibration operation Y of the polishing tape T, and the rotation speed Q of the screw shaft W were synchronized. with a combined operation with the movement of the polishing tape T, toward each abrasive tape T, T-T of the three pairs of the tape head portion 7, 7, 7 in the radial direction of the screw shaft W to the axis W ₁ of the screw shaft W The ball groove B can be polished with the polishing tape T in pressure contact with the ball groove B, and the polishing tape T is aligned with the lead L of the ball groove B by the movement of the polishing tape T in synchronization with the rotation speed Q of the screw shaft W. Then, the tape T is brought into contact with the ball groove B by the tape press mechanism 4. Is, the abrasive tape T continuously or intermittent by a linear oscillating oscillation operation Y of transfer T ₁ and the polishing tape T in abrasive tape T can be reliably polish the ball groove B of, as shown in FIG. 13, three sets of tape head portion 7, 7, 7 each abrasive tape T, T-T of the screw shaft W each abrasive tape T of the ball groove B from the radial pressed against the ball groove B towards the axis W ₁ of the screw shaft W of the · T · T in can be polished simultaneously, it is possible to improve the polishing precision can be suppressed runout axes W ₁ of the screw shaft W by pressing the abrasive tape T · T · T, the ball grooves The surface roughness of B can be improved and the polishing workability of the ball groove B can be improved.

Further, in this case, as the straight line Yurafu mechanism 6, since the eccentric mechanism 6a for linearly oscillating oscillation operation Y of the pressure roll R to the rotational axis R ₁ direction, it is possible to simplify the structure, and, in this case As the speed synchronizing means 9, a rotation control motor 2a for rotating the screw shaft W, a movement control motor 8g for moving the polishing tape T, a rotation speed Q of the rotation control motor 2a and a movement control motor 8g. Therefore, the rotational speed Q of the screw shaft W and the moving speed F of the polishing tape T can be synchronized with the lead L of the ball groove B, so that the polishing speed can be synchronized. The tape T can be surely moved in contact with the lead L of the ball groove B, so that the structure can be simplified and the polishing accuracy can be improved.

  The present invention is not limited to the above embodiment, but the holding mechanism 1, the rotation mechanism 2, the tape transport mechanism 3, the tape pressure contact mechanism 4, the tilt mechanism 5, the linear vibration mechanism 6, the tape head portion 7, The configuration of the tape head moving mechanism 8 and the speed synchronization means 9 is designed with appropriate changes.

  For example, in the embodiment described above, as the tape head moving mechanism 8, three sets of tape head portions 7, 7, 7 are attached to a single moving base base K, respectively, and three sets of tape head portions 7, 7, 7 are installed. 7 are configured to move together, but it is also possible to adopt a structure in which the three tape head portions 7, 7, and 7 are moved independently.

  Also, for example, in the above embodiment, a dry polishing structure is used, but a processing liquid or lubricant containing free abrasive grains or chemical agents of various materials between the ball groove B of the screw shaft W and the polishing tape T. A so-called wet-grinding structure that supplies the same, or a mechanical synchronous rotation mechanism similar to the replacement gear mechanism employed in the lead screw mechanism of the lathe may be employed as the speed synchronization means 9. The design is selected according to the type of the screw shaft W and the polishing conditions.

  As described above, the intended purpose can be sufficiently achieved.

W screw shaft W ₁ axis T polishing tape T ₁ transfer R pressure roll B ball groove R ₁ rotation axis θ lead angle Y linear vibration operation Q rotation speed F movement speed L lead 1 holding mechanism 2 rotation mechanism 3 tape transfer mechanism 4 tape Pressure contact mechanism 5 Inclination mechanism 6 Linear vibration mechanism 7 Tape head portion 8 Tape head moving mechanism 9 Speed synchronization means

Claims (4)

  When polishing the ball groove of the screw shaft of the ball screw with the polishing tape, a tape transfer mechanism for transferring the polishing tape continuously or intermittently, and the polishing tape is returned and guided by the outer peripheral surface of the pressure contact roll to perform the polishing. A tape pressing mechanism for pressing the tape to the ball groove of the screw shaft on the outer peripheral surface of the pressing roll; a tilting mechanism for tilting and arranging the rotation axis of the pressing roll corresponding to the lead angle of the ball groove; and the pressing roll Three tape heads comprising a linear oscillation mechanism for linearly oscillating the shaft in the direction of the rotation axis are arranged in three substantially equal positions in the circumferential direction of the screw shaft, and the screw shaft is held rotatably. Then, the abrasive tapes of the three sets of tape heads are transferred continuously or intermittently around the axis, and the abrasive tapes of the three sets of tape heads are folded back by the outer peripheral surface of the pressure contact roll. Transfer The abrasive tape is guided to be brought into pressure contact with the ball groove of the screw shaft at the outer peripheral surface of the pressure roll, and the rotation axis of each pressure roll is inclined according to the lead angle of the ball groove, and each pressure roll Linearly swinging in the direction of the rotation axis, moving each polishing tape of the three sets of tape heads in the direction of the axis of the screw shaft, and adjusting the rotational speed of the screw shaft and the movement speed of each polishing tape Synchronized operation corresponding to the lead of the ball groove, combined operation of rotation of the screw shaft, transfer of the polishing tape and linear vibration operation, and movement of each polishing tape synchronized with the rotation speed of the screw shaft The polishing tapes of the three sets of tape heads are pressed against the ball grooves from the radial direction of the screw shaft toward the axis of the screw shaft, and the ball grooves are simultaneously polished with the polishing tapes. A ball screw polishing method.   A holding mechanism for rotatably holding a screw shaft of a ball screw, a rotating mechanism for rotating the screw shaft about the axis, a tape transfer mechanism for transferring the polishing tape continuously or intermittently, and the polishing tape A tape pressure-contacting mechanism that guides the outer surface of the pressure-contact roll by turning it back and presses the polishing tape against the ball groove of the screw shaft on the outer-periphery surface of the pressure-contact roll. And a tape head portion that moves the tape head portion in the axial direction of the screw shaft. And a mechanism for synchronizing the rotational speed of the screw shaft and the moving speed of the polishing tape in correspondence with the lead of the ball groove, Three sets are arranged at approximately three equal positions in the circumferential direction of the screw shaft, and the polishing tape of each tape head portion is pressed against the ball groove from the radial direction of the screw shaft toward the axis of the screw shaft. A ball screw polishing apparatus characterized by simultaneously polishing with a polishing tape.   3. The ball screw polishing apparatus according to claim 2, wherein the linear vibration mechanism is an eccentric mechanism that linearly swings the pressure contact roll in the rotation axis direction.   As the speed synchronization means, a rotation control motor for rotating the screw shaft, a movement control motor for moving the polishing tape, and a synchronous control of the rotation speed of the rotation control motor and the rotation speed of the movement control motor 4. The ball screw polishing apparatus according to claim 2, further comprising a synchronous control unit.