JP2006043818A - Honing machine and honing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a honing machine and a honing method, controlling expansion of a grinding abrasive grain part finely and with high accuracy and expanding the grinding abrasive grain part while rotating a main shaft. <P>SOLUTION: This honing machine includes: a tool 10 provided with a taper cone 59 movable in the axial direction and a grinding abrasive grain part 79 having slits 75, 76 expanded in the radial direction by the axial movement of the taper cone; and the main shaft 11 in which an expansion driving shaft 31 for moving the taper cone in the axial direction is rotatably inserted, wherein a master servo motor 15 for driving the main shaft 11 in rotation and a slave servo motor 32 for driving the expansion driving shaft 31 in rotation are controlled to rotate by a synchronous rotation control device 47 to apply a synchronous rotational phase difference. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a machining apparatus and a machining method for honing a prepared hole of a workpiece with a rotationally driven tool.

   2. Description of the Related Art Conventionally, honing is performed on an inner peripheral surface of a workpiece by feeding and moving a rotating honing grindstone in the axial direction. Such a honing grindstone has a structure that can be enlarged or reduced so that the outer diameter of the grinding abrasive grain portion can be adjusted to the finished diameter of the workpiece to be machined or to correct the wear of the grindstone. For this purpose, the honing grindstone is formed with a plurality of slits on the circumference, and a taper cone is inserted into the slit so as to be movable in the axial direction, and the taper cone is moved in the axial direction by a screw action to thereby perform the honing process. The grindstone can be elastically expanded.

By the way, in this type of honing processing, as described in Patent Document 1, for example, there is known a honing processing device capable of mechanically enlarging / reducing the grinding abrasive grain portion. Thus, there is an advantage that the grinding abrasive grain portion can be automatically enlarged and reduced.
JP 2000-343327 (paragraphs 0020 and 0043, FIGS. 2 and 3)

  However, in the conventional honing apparatus described above, the taper cone for enlarging / reducing the grinding abrasive grain part is operated by a mechanical mechanism using gears or the like, so that the expansion accuracy is rough and the unit is 1 micrometer. There is a problem that precise expansion with is difficult. Moreover, in the above-described conventional honing apparatus, when the grinding abrasive grain portion is expanded, the main shaft is stopped, and in that state, the rotating shaft is rotated by a motor so that the grinding abrasive grain portion is expanded. There is a problem that it is impossible to expand the grinding abrasive grain part while machining the workpiece, and there is a problem that the machining content that can be honed is restricted.

  In addition, in the honing process of blind holes in which a honing process grindstone is fed from the base of the work hole to the back of the work piece, the tip of the abrasive grain part wears out, which can easily affect the work accuracy of the work piece. There was a problem that the grinding wheel life was short and high-precision honing was difficult.

  The present invention has been made to solve the conventional problems, and it is possible to finely and precisely extend and control a grinding grain portion having a slit that can be expanded in the radial direction. An object of the present invention is to provide a honing apparatus capable of expanding a grain part and a honing method capable of processing a blind hole of a workpiece with high accuracy and efficiency.

  In order to solve the above problems, the honing apparatus according to the first aspect of the present invention is characterized in that a main spindle head mounted on a main body so as to be slidable in a feeding direction, and the main spindle head is connected to the main body. A honing apparatus comprising: a feed device that moves forward and backward toward a workpiece attached to a workpiece; and a spindle that is rotatably supported by the spindle head and on which a tool for honing a pilot hole of the workpiece is attached to a tip. The tool includes a taper cone movable in the axial direction, and a grinding abrasive grain portion having a slit expandable in a radial direction by the axial movement of the taper cone, and the main shaft is rotated relative to the main shaft by the taper cone. An extension drive shaft that moves the shaft in the axial direction is rotatably inserted, and further, a master servo motor that rotates the main shaft and a rotation drive of the extension drive shaft And Turkey servomotor, the is that a synchronous rotation controller controlling the rotation so as to synchronize the parent servomotor child servomotor and imparting rotational phase difference.

  The honing apparatus according to the second aspect of the present invention is characterized in that the main shaft head mounted on the main body so as to be slidable in the feed direction, and the main body is directed to a workpiece attached to the main body. A honing device comprising: a feed device that moves forward and backward; and a main shaft that is rotatably supported by the main shaft head and on which a tool for honing the pilot hole of the workpiece is attached. A tool holder mounted on the tip, and a honing grindstone mounted on the tip of the tool holder. The honing grindstone is moved in the radial direction by the axial movement of the taper cone and the axial movement of the taper cone. A grinding abrasive grain part having an expandable slit, and the main shaft is rotatably inserted through an expansion drive shaft, and the main shaft is further rotated. A master servo motor that rotates, and a slave servo motor that rotationally drives the extension drive shaft, and a synchronous rotation control device that controls the master servo motor and the slave servo motor to rotate and to provide a rotational phase difference. The tool holder is rotatably supported by a rotating nut that moves the tapered cone in the axial direction by relative rotation of the extension drive shaft with respect to the main shaft.

  The honing apparatus according to the third aspect of the present invention is characterized in that the main shaft head is slidably mounted on the main body so as to be slidable in the feed direction, and the main head is directed to a workpiece attached to the main body. Honing comprising: a feed device that moves forward and backward, a spindle that is rotatably supported by the spindle head and on which a tool for honing the pilot hole of the workpiece is attached, and a spindle drive device that rotationally drives the spindle In the processing apparatus, the tool includes a tool holder attached to the tip of the spindle, a floating body supported by the tool holder in a plane perpendicular to the axis of the spindle, and a tip of the floating body. A honing grindstone to be mounted, and the honing grindstone includes an axially movable taper cone and an axial direction of the taper cone And a grinding abrasive grain part having a slit that can be expanded in the radial direction by movement, the main shaft is rotatably inserted through the expansion drive shaft, and the taper cone is axially rotated by relative rotation of the expansion drive shaft with respect to the main shaft. The rotating nut to be moved to is rotatably supported by the floating body.

  According to a fourth aspect of the present invention, the honing apparatus according to the fourth aspect of the present invention includes the expansion connecting shaft according to the third aspect, wherein the rotating nut and the expansion drive shaft are coupled to allow the rotating nut to float. That is.

  The honing method according to the fifth aspect of the present invention is characterized in that a main shaft on which a tool for honing a prepared hole made of a blind hole is mounted is rotatably supported on the main shaft head, and the main shaft head The tool is moved relative to the workpiece by a feeding device, and the blind hole is honed by the tool. The tool has a slit having a slit that expands and contracts in the radial direction by the axial movement of the taper cone. An abrasive grain part is provided, and the main shaft is rotatably inserted through an extended drive shaft that moves the taper cone in the axial direction by relative rotation with the main shaft. A rotation phase difference between the master servo motor that rotates the main shaft and the slave servo motor that rotates the extension drive shaft. The tip of the abrasive grain part is expanded by controlling the rotation so as to be applied, and then the parent servo motor and the slave servo motor are controlled to rotate synchronously. In this state, the tool is blinded to the workpiece. The blind hole of the workpiece is honed by relative movement in the direction of pulling out from the workpiece.

  The honing method according to the sixth aspect of the present invention is characterized in that the honing method according to the fifth aspect of the present invention is characterized in that, in the fifth aspect, the tip of the grinding abrasive grain portion is caused by a rotational phase difference applied between the parent servo motor and the child servo motor. The tip of the grinding abrasive grain is expanded so that most of the machining allowance of the blind hole of the workpiece can be honed at the cylindrical finish portion and the chamfered corner on the rear end side, and the blind hole of the workpiece can be passed with one pass. Honed.

  According to the honing apparatus according to claim 1, the taper cone is moved in the axial direction by relative rotation between the main shaft and the extended drive shaft inserted through the main shaft, and the grinding abrasive grain portion is expanded. Since the main servo motor that rotates and the slave servo motor that rotates the expansion drive shaft are controlled to rotate in synchronization and to give a rotational phase difference, the grinding abrasive grains are automatically and finely divided. Extended control can be performed, and there is an effect that high-precision honing can be performed.

  According to the honing apparatus according to claim 2, in addition to the above-described configuration, the tool holder rotatably supports the tool holder with a rotation nut that moves the taper cone in the axial direction by relative rotation of the extension drive shaft with respect to the main shaft. Thus, the rotary nut can be easily stored in the tool holder, and the grinding abrasive grain portion can be easily finely expanded.

  According to the honing apparatus according to claim 3 and claim 4, the floating body on which the honing grindstone is mounted is supported on the tool holder so as to be able to float, and the honing grindstone having an automatic expansion function is mounted on the workpiece hole. Therefore, it is possible to perform high-precision honing without being affected by misalignment between the center of the pilot hole and the center of the honing grindstone.

  According to the honing method according to claim 5, grinding is performed by positioning the tool on the back side of the blind hole of the workpiece in a contracted state, and giving a rotational phase difference between the main shaft and the extended drive shaft in that state. The tip of the abrasive grain is expanded, and then the tool is honed by moving the tool relative to the direction of pulling out the blind hole while synchronously controlling the main shaft and the expansion drive shaft. Therefore, most of the machining allowance of the blind hole can be efficiently honed, and since there is no wear of the tip of the abrasive grain part, there is an effect that the honing process can be performed to the back side of the blind hole of the workpiece with high accuracy.

  According to the honing method according to claim 6, the cylindrical finish portion at the front end portion of the grinding abrasive grain portion and the biting angle at the rear end side due to the rotational phase difference applied between the parent servo motor and the child servo motor. In addition to the effect of claim 5, the blind hole of the workpiece can be formed with a single pass. There is an effect that honing can be performed with high accuracy and high efficiency.

   Hereinafter, a honing apparatus and a processing method according to a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a column 2 is erected on a bed 1 to constitute a main body 3. Further, on the bed 1, a workpiece W in which a pilot hole to be honed is drilled is attached. A spindle head 4 is mounted on the column 2 so as to be slidable in the vertical direction (feed direction), and is reciprocated by a servo motor 6 via a ball screw mechanism 5. The ball screw mechanism 5 and the servo motor 6 constitute a feed device 7 that moves the spindle head 4 forward and backward toward the workpiece W. When the servo motor 6 is driven to rotate based on a command from the numerical controller 50, the spindle The head 4 is moved by the commanded feed amount at the commanded feed speed.

   As shown in FIG. 2, a main shaft 11 is supported by the main shaft head 4 so as to be slidable and rotatable in the feed direction, and a honing process as a tool for honing a prepared hole of the workpiece W at the tip of the main shaft 11. A grindstone 10 is attached. That is, the guide cylinder 12 is fixed to the spindle head 4, and the spindle 11 is supported in the guide cylinder 12 by the stroke ball bearings 13 and 14 so that the lower and upper portions can slide and rotate. The spindle 11 is rotationally driven via a belt transmission mechanism 16 by a master servo motor 15 that constitutes a spindle driving device installed on the spindle head 4, and is given oscillation by an oscillation device 17.

  The oscillation device 17 has a link member 19 pivotally attached to the main shaft head 4 by a hinge pin 18 so as to be swingable about a swing axis perpendicular to the axis of the main shaft 11, and relative rotation to the main shaft 11 via a bearing 20. The link member 19 is connected to the connection member 21 so that the relative movement in the main shaft axis direction is restricted. The connecting member 21 is prevented from being rotated around the spindle head 4 by a locking pin 22. One end of the link member 19 is in contact with the roller 24 of the cam mechanism 23 by the spring force of a spring described later. The roller 24 of the cam mechanism 23 is eccentrically rotated by a servo motor (not shown), and the link member 19 is swung around the hinge pin 18 by the eccentric rotation of the roller 24. Due to the swinging of the link member 19, the main shaft 11 is oscillated through the connecting member 21 by a predetermined stroke. Above the connecting member 21, a pulley 25 is provided that is locked to the main shaft 11, and a pulley 27 that is connected to the pulley 25 via a timing belt 26 is locked to the motor shaft 28 of the parent servomotor 15. Yes. The pulleys 25 and 27 and the timing belt 26 constitute the belt transmission mechanism 16.

  An extension drive shaft 31 is rotatably inserted into the main shaft 11, and the upper end of the extension drive shaft 31 protrudes from the upper end of the main shaft 11. The extension drive shaft 31 is rotationally driven via a belt transmission mechanism 33 by a slave servo motor 32 constituting an extension drive shaft drive device installed on the spindle head 4. That is, a pulley 34 is locked to the projecting end of the extended drive shaft 31, and a pulley 36 connected to the pulley 34 via a timing belt 35 is locked to a motor shaft 37 of the slave servo motor 32. The pulleys 34 and 36 and the timing belt 35 constitute the belt transmission mechanism 33.

  The pulley 34 locked to the extended drive shaft 31 is connected to a spring receiving ring 39 rotatably supported by the main shaft 11 via a bearing 38, and a bearing 40 is attached to the lower end of the spring receiving ring 39. . A fixing ring 41 is fixed to the spindle head 4 so as to surround the spring receiving ring 39, and the spindle 11 is urged downward between a spring receiving portion 42 provided at the upper end of the fixing ring 41 and the bearing 40. A compression spring 43 is inserted as an elastic member. The main shaft 11 is urged downward by the compression spring 43, thereby urging the link member 19 in a direction to contact the roller 24 of the cam mechanism 23 via the connecting member 21.

  The parent servo motor 15 and the slave servo motor 32 are connected to a synchronous rotation control device 47 via servo amplifiers 45 and 46 as shown in FIG. The synchronous rotation control device 47 is controlled based on the synchronous rotation command C1 and the extended cut command C2 from the numerical control device 50, and controls the rotation of the master servo motor 15 and the slave servo motor 32 in synchronization. The relative rotation is performed by the phase angle.

  As shown in FIG. 4, a holder mounting hole 51 is formed at the lower end of the main shaft 11, and a shank portion 52 a of the tool holder 52 is detachably mounted in the holder mounting hole 51. A tool mounting hole 53 is formed at the lower end of the tool holder 52, and the shank portion 10a of the honing grindstone 10 is detachably mounted in the tool mounting hole 53 via a collet 10b. A rotation nut 55 is supported by a pair of thrust bearings 56 and 57 at the center of rotation in the tool holder 52 so as to be rotatable only. The rotating nut 55 is coupled to the lower end of the extended drive shaft 31 by a connecting shaft 58 that passes through the tool holder 52, and the rotation of the extended drive shaft 31 is transmitted to the rotating nut 55 through the connecting shaft 58.

  An expanded taper cone shaft 60 having a tapered cone 59 formed at the tip is inserted into the honing grindstone 10 so as to be slidable only in the axial direction by a non-rotating pin 61, and a male screw 62 is formed at the upper end of the expanded taper cone shaft 60. . The male screw 62 is screwed into a female screw 63 formed on the rotary nut 55. As a result, when the rotary nut 55 is rotated by the extended drive shaft 31, the tapered cone 59 is moved in the axial direction by the screw action together with the extended tapered cone shaft 60.

  Next, a specific configuration of the honing grindstone 10 attached to the tip of the tool holder 52 will be described based on FIG. 5, FIG. 6, and FIG.

   At the tip of the cylindrical grindstone main body 71 of the honing grindstone 10, a cylindrical finish portion 72 and a tapered biting corner portion connected to the upper end of the cylindrical finish portion 72 and having a diameter decreasing upward. 73 is formed. A plurality of (for example, six) oil grooves 74 are engraved on the outer periphery of the tip of the grindstone main body 71 along the axial direction at equal intervals on the circumference. At the bottom of each oil groove 74, first slits 75 and second slits 76 whose cut surfaces are directed in the radial direction are alternately provided in adjacent oil grooves 74. The 1st slit 75 is divided | segmented into the front slit 75b and the back slit 75c by the connection part 75a provided slightly ahead from the front end of the biting corner | angular part 73, and the front-end | tip of the 2nd slit 76 becomes the front-end | tip of the finishing part 72. The lower end of the main body 71 is connected by a connecting portion 76a. Abrasive grains 78 are bonded and held at land portions 77 between adjacent oil grooves 74 to form abrasive grains 79. Thus, the 1st slit 75 and the 2nd slit 76 are cut | disconnected in the zigzag form from which the axial direction positional relationship of an adjacent slit differs so that the cylindrical finishing part 72 and the biting corner | angular part 73 can expand.

   A tapered hole 80 having a smaller diameter toward the tip is formed in the inner periphery of the tip of the grindstone main body 71, and the aforementioned tapered cone 59 is fitted into the tapered hole 80. Since the front end portion of the grindstone main body 71 is formed with slits 75 and 76 so as to be elastically deformed, when the tapered cone 59 is moved downward, the front end portion of the grindstone main body 71 is expanded outward, The rear end portion of the grindstone main body 71 is not expanded due to the rigid structure. As a result, as described above, the expanded cylindrical finish portion 72 is formed at the front end portion of the grindstone main body 71 and the cylindrical finish portion 72 is also formed. A tapered chamfered corner 73 that is tapered rearward is formed at the rear end.

  Next, the operation in the above-described first embodiment will be described with respect to an example in which the prepared hole of the workpiece W including the blind hole W1 is honed. In the in-situ state shown in FIG. 1, the cylindrical finishing portion 72 of the honing grindstone 10 attached to the tip of the main shaft 8 via the tool holder 52 has a blind hole ( Pilot hole) Reduced to an amount obtained by adding a margin to the allowance for W1. In this state, when the workpiece W is mounted on the bed 1 and the start button is pressed, the spindle head 4 is moved downward via the ball screw mechanism 5 by the rotation of the servo motor 6, and the honing grindstone 10 is machined. The object W is inserted into the blind hole W1.

  When the spindle head 4 is lowered to the commanded position and the honing grindstone 10 is inserted to the depth of the blind hole W1 of the workpiece W (state shown in FIG. 8), an extension cutting command C2 is issued from the numerical controller 50. Based on this, the synchronous rotation control device 47 controls the rotation of the main shaft 8 by the parent servomotor 15, and the extension drive shaft 31 is driven by the slave servomotor 32 at a predetermined relative rotational speed with the parent servomotor 15. The rotational drive is controlled so as to have a predetermined rotational phase difference. At the same time, the main shaft 8 is oscillated in the vertical direction by the oscillation device 17.

  By such relative rotation control of the parent servo motor 15 and the slave servo motor 32, the expansion drive shaft 31 is rotated relative to the main shaft 11 by a predetermined rotational phase difference, and the taper cone 59 is moved downward by the screw action of the rotation nut 55. Is moved by a predetermined amount at a predetermined moving speed. As a result, the cylindrical finishing portion 72 at the tip of the grindstone main body 71 is expanded by a preset amount (an amount corresponding to the machining allowance portion W1a), and as shown in FIG. The inner peripheral surface of the blind hole W1 of W is honed by plunge processing by the cylindrical finishing portion 72 and the chamfered corner portion 73.

  Subsequently, based on the synchronous rotation command C 1 from the numerical controller 50, the master servo motor 15 and the slave servo motor 32 are synchronously controlled by the synchronous rotation controller 47, and in this state, the spindle head 4 is controlled by the servo motor 6. It is moved upward via the ball screw mechanism 5 by the rotation, and is finished by the cylindrical finishing portion 72 while the machining allowance W1a of the blind hole W1 of the workpiece W is honed by the biting corner 73. Then, the spindle head 4 is raised to the position where the cylindrical finishing portion 72 comes out of the mouth of the workpiece W while being oscillated to the spindle 11, and the blind hole W1 of the workpiece W is set to a predetermined machining dimension in one pass. Honed straight.

  In this case, the honing grindstone 10 can optimize the length of the chamfered corner portion 73 by changing the slit length. Accordingly, the processing load of the grinding abrasive grain portion 79 during the honing process can be reduced by the chamfered corner portion 73 having a certain length, so that the processing load can be reduced. Thereby, while being able to make small deformation | transformation of the honing grindstone 10, the abrasion of the grinding abrasive grain part 79 can be decreased, and the honing process precision and the lifetime of the honing grindstone 10 can be improved.

  In addition, as described above, the workpiece W can be machined by one pass in one ascending cycle, and can also be honed by a plurality of cycles such as roughing and finishing cycles, and the length direction of the pilot hole It is also possible to correct the cylindricity accuracy of the prepared hole or to impart a tendency by processing a part of the plurality of cycles.

  FIG. 10 shows a second embodiment of the present invention, which is a honing grindstone 81 suitable for honing when the prepared hole of the workpiece W is a through hole W2. The honing grindstone 81 is mounted on the tool holder 52 mounted on the main shaft 11 as in the above-described embodiment. A front guide 83 having a chamfered tip is formed at the tip of the grindstone main body 82 of the honing grindstone 81 so as to smoothly enter the through hole W2 of the workpiece W. Further, a plurality of slits 85 are formed on the circumference in the axial center of the grinding abrasive grain portion 84 formed in the grindstone main body 82, and the diameter increases toward the tip corresponding to the axial center position of the slit 85. A tapered cone 86 is fitted. When the taper cone 86 is moved upward together with the extended taper cone shaft 87, the central portion in the axial direction of the abrasive grain portion 84 becomes the most expanded cylindrical finish portion 88, and the upper and lower end portions of the cylindrical finish portion 88. Tapered corner portions 89 and 90 that taper in the vertical direction are formed respectively.

  Therefore, according to this embodiment, the honing grindstone 81 is sent downward toward the through hole W2 of the workpiece W while the main shaft 11 and the extended drive shaft 31 are synchronously controlled by the synchronous rotation control device 47 described above. Then, the front guide 83 is fitted into the through hole W2, and in that state, the through hole W2 is gradually honed from the opening by the biting corner portion 90 to increase the diameter, and then the cylindrical finish portion 88 is passed through. Honing the inner peripheral surface of the hole W2 straight.

  Then, when the cylindrical finishing portion 88 passes through the through hole W2, the feeding of the honing grindstone 81 is stopped. In this state, the synchronous rotation control device 47 causes the main shaft 11 and the extended drive shaft 31 to have a predetermined relative rotational speed and The rotation is controlled so as to have a predetermined rotational phase difference. Thereby, the taper cone 86 is moved in the axial direction, and the cylindrical finishing portion 88 is further expanded outward. After that, when the main shaft 11 and the extension drive shaft 31 are synchronously rotated again and the honing grindstone 81 is sent upward, the diameter of the through hole W2 is further expanded by the biting corner portion 89 and the cylindrical finish portion 88, and honing is performed. Is done. Thus, the through hole W2 of the workpiece W is honed to a predetermined dimension by the reciprocating motion of the honing grindstone 81.

  Next, a third embodiment of the present invention will be described based on FIG. 11, FIG. 12, FIG. 13, and FIG.

  A cylindrical cover 91 is fixed to the lower end of the tool holder 52 mounted in a holder mounting hole 51 formed at the lower end of the main shaft 11 by a bolt 92, and an adjustment nut 93 is provided at the lower opening end of the cover 91. Screwed for position adjustment. An intermediate ring 94, a floating grip 95, and a taper ring 96 are accommodated in the cover 91. The intermediate ring 94 and the floating grip 95 can float by a predetermined amount in the radial direction. Is guided on the inner periphery of the cover 91 so as to be slidable concentrically with the main shaft 11. The lower end of the floating holding part 95 protrudes from the inside of the cover 91, and the honing grindstone 10 having the same configuration as shown in FIG. 4 is detachably mounted in a tool mounting hole 97 formed at the lower end. The intermediate ring 94 is sandwiched between the lower end of the tool holder 52 and the upper end of the floating grip portion 95, and by the biasing force of the compression spring 99 provided via the bearing 98 between the floating grip portion 95 and the taper ring 96, A tool holder 52, an intermediate ring 94, and a floating grip 95 are joined in the vertical direction with guide balls 101 and 102 to be described later interposed therebetween.

  At the upper end of the intermediate ring 94 facing the lower end of the tool holder 52, as shown in FIG. 13, a two-sided width upper layer groove 103 having a predetermined depth is formed in the diameter direction (X direction). As shown in FIG. 14, a dihedral width lower layer groove 104 having a predetermined depth is formed in the diameter direction (Y direction) perpendicular to the upper layer groove 103 at the lower end of the intermediate ring 94 opposed to the upper end of 95. . On the other hand, on the lower end of the tool holder 52 facing the upper end of the intermediate ring 94, two-sided protrusions 105 having a predetermined height corresponding to the upper layer groove 103 are formed at two locations on the diameter line. On the upper end of the floating grip portion 95 opposite to the lower end, two-sided width protrusions 106 having a predetermined height are formed at two positions on the diameter line corresponding to the lower layer groove 104. A pair of guide balls 101 is inserted between both sides of the two-sided protrusion 105 and the upper layer groove 103, whereby the intermediate ring 94 is joined to the lower end of the tool holder 52 via the guide balls 101. Along with the guide ball 101, the tool holder 52 can slide in the X direction. Similarly, a pair of guide balls 102 are inserted between both sides of the two-sided protrusion 106 and the lower layer groove 104, whereby the floating gripping portion 95 is interposed between the lower end of the intermediate ring 94 and the guide balls 102. And are guided by the guide ball 102 to be slidable in the Y direction with respect to the intermediate ring 94.

  As a result, the floating grip 95 can float with respect to the tool holder 52 in a horizontal XY plane perpendicular to the axis of the main shaft 11. In addition, when an external force is applied in the angular direction, one of the two rows of guide balls 101 and 102 in the X direction and the Y direction serves as a fulcrum and the other floats, and the floating grip portion 95 is inclined in the direction in which the external force is applied. Directional floating is also possible.

  A tapered surface 107 is formed on the floating grip portion 95, and a tapered surface 108 that engages with the tapered surface 107 is formed on the tapered ring 96. Then, when the taper ring 96 is raised against the urging force of the compression spring 99 by adjusting the position of the adjustment nut 93, both the taper surfaces 107 and 108 are engaged with each other so that the floating grip 95 is accurately centered on the rotation center. It becomes possible to position. When the taper ring 96 is moved downward by adjusting the position of the adjustment nut 93, a clearance is generated between the taper surfaces 107 and 108, and the floating grip 95 can float by this clearance. At this time, since the taper ring 96 is positioned at the center of rotation, even the slight clearance between the two taper surfaces 107 and 108 does not interfere with each other, and the floating grip portion 95 can be floated in the horizontal and angular directions. Can be achieved.

  A rotary nut 55 is supported by the pair of thrust bearings 56 and 57 on the shaft center portion of the floating grip 95 so as to be rotatable only. The rotary nut 55 is connected to the lower end of the extended drive shaft 31 by allowing the floating grip portion 95 to float by an extended connecting shaft 110 penetrating the tool holder 52. In other words, spherical portions 111 and 112 having a polygonal cross section are formed at both ends of the extended connecting shaft 110, and the spherical portions 111 and 112 are polygons formed at the lower end of the extended drive shaft 31 and the upper end of the rotary nut 55. Each is engaged with a hole. Accordingly, the rotation of the extended drive shaft 31 can be transmitted to the rotary nut 55 while allowing the floating grip portion 95 to float.

  As described in the first embodiment, an expanded tapered cone shaft 60 having a tapered cone 59 formed at the tip is inserted into the honing grindstone 10 so as to be slidable only in the axial direction by a non-rotating pin 61. A male screw 62 is formed at the upper end of 60. The male screw 62 is screwed into a female screw 63 formed on the rotary nut 55.

  According to the above embodiment, when the honing grindstone 10 slightly processes the pilot hole of the workpiece W due to the descending of the spindle head 4, the radial grinding force acting on the honing grindstone 10 is balanced and the honing grindstone 10. The honing grindstone 10 is floated with respect to the workpiece W so that an offset load does not act on the workpiece W, and the centers of the honing grindstone 10 and the prepared hole of the workpiece W are matched. Thereby, the honing grindstone 10 performs the honing process of the prepared hole with high straightness and roundness with high accuracy without being affected by the positional deviation or bending of the prepared hole.

  The configuration of the honing grindstones 10 and 81 described in the above-described embodiment shows one optimal specific example, and the present invention is not limited to the configuration of the embodiment, and has another function having the same function. Similarly, the synchronous rotation control of the main shaft 11 and the extended drive shaft 31 and the floating mechanism of the honing grindstone 10 can be variously modified without departing from the technical idea of the present invention. Of course, the configuration can be adopted.

It is a side view showing the whole honing machine concerning a 1st embodiment of the present invention. It is an expanded sectional view of the spindle head part of the honing machine shown in FIG. It is a system block diagram of servomotor synchronous rotation control. It is an expanded sectional view of the tool holder part of the honing machine shown in FIG. It is a front view of the honing grindstone of the honing machine shown in FIG. It is a longitudinal cross-sectional view of the honing grindstone shown in FIG. It is the sectional view on the AA line of FIG. It is a process start state figure which shows the honing processing method by the honing machine which concerns on the 1st Embodiment of this invention. It is a processing state figure which shows the honing processing method by the honing machine which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the honing grindstone of the honing machine which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the tool holder part of the honing machine which concerns on the 3rd Embodiment of this invention. It is the BB sectional drawing of FIG. It is C arrow line view of FIG. It is D arrow line view of FIG.

Explanation of symbols

4 ... spindle head, 6 ... servo motor for feeding, 7 ... feeding device, 10, 81 ... honing grinding wheel, 11 ... spindle, 15 ... parent servo motor, 17 ...・ Oscillation device 31 ... Extension drive shaft 32 ... Sub servo motor 47 ... Synchronous rotation control device 50 ... Numerical control device 52 ... Tool holder 55 ... Rotation Nut, 59, 86 ... taper cone, 60 ... extended taper cone shaft, 62, 63 ... screw, 71 ... grindstone body, 72, 88 ... cylindrical finish, 73, 89, 90 .. Chamfered corners, 75, 76, 85 ... slits, 79, 84 ... grinding abrasive grains, 80 ... taper hole, 91 ... cover, 93 ... adjustment nut, 94 ..Intermediate ring, 95 ... floating gripping part, 96 · Tapering, 99 ... compression spring, 101, 102 ... guide ball 110 ... extended connecting shaft, 111 and 112 ... spherical portion.

Claims (6)

A spindle head that is slidably mounted in the feed direction on the main body, a feed device that moves the spindle head forward and backward toward a workpiece attached to the main body, and a spindle device that is rotatably supported by the spindle head at the tip. A honing apparatus comprising a main shaft to which a tool for honing a prepared hole of the workpiece is attached, wherein the tool is expandable in a radial direction by an axial movement of the taper cone and an axial movement of the taper cone A master servo that includes a grinding abrasive grain portion having a slit, wherein the main shaft is rotatably inserted through an extended drive shaft that moves the taper cone in the axial direction by relative rotation with the main shaft, and further drives the main shaft to rotate. A motor, a slave servo motor that rotationally drives the extension drive shaft, and the parent servo motor and the slave servo motor are synchronized and a rotational phase difference is given. Honing device being characterized in that a synchronous rotation controller controlling the rotation of the so that. A spindle head that is slidably mounted in the feed direction on the main body, a feed device that moves the spindle head forward and backward toward a workpiece attached to the main body, and a spindle device that is rotatably supported by the spindle head at the tip. A honing apparatus comprising: a main shaft to which a tool for honing a prepared hole of the workpiece is attached; and the tool is a tool holder attached to a tip of the main shaft, and a honing attached to a tip of the tool holder The honing grindstone includes a tapered cone that is movable in the axial direction and a grinding abrasive grain portion that has a slit that can be expanded in the radial direction by the axial movement of the tapered cone, and the main shaft is expanded. A drive servo shaft is rotatably inserted, and further, a master servo motor that drives the main shaft to rotate, and a slave servo motor that drives the extension drive shaft to rotate. And a synchronous rotation control device that controls the rotation so as to synchronize the parent servo motor and the slave servo motor and give a rotation phase difference, and the tool holder has a relative rotation of the extended drive shaft with respect to the main shaft A honing machine, wherein a rotary nut for moving the taper cone in the axial direction is rotatably supported. A spindle head that is slidably mounted in the feed direction on the main body, a feed device that moves the spindle head forward and backward toward a workpiece attached to the main body, and a spindle device that is rotatably supported by the spindle head at the tip. In a honing apparatus comprising a main shaft to which a tool for honing the pilot hole of the workpiece is attached, and a main shaft driving device for rotationally driving the main shaft, the tool is a tool holder attached to the tip of the main shaft; The tool holder comprises a floating body supported so as to be floatable in a plane orthogonal to the axis of the main shaft, and a honing grindstone mounted on the tip of the floating body, and the honing grindstone is arranged in the axial direction. A movable taper cone and a grinding abrasive grain portion having a slit that can be expanded in the radial direction by the axial movement of the taper cone. The main shaft is rotatably inserted into the extension drive shaft, and a rotating nut that moves the taper cone in the axial direction by relative rotation of the extension drive shaft with respect to the main shaft is rotatably supported by the floating body. Honing machine characterized by The honing apparatus according to claim 3, further comprising an extended connection shaft that connects the rotary nut and the extended drive shaft while allowing the rotary nut to float. A spindle on which a tool for honing a prepared hole made of a blind hole is mounted is rotatably supported on the spindle head, and the spindle head is moved relative to the workpiece by a feeder, and the stop is moved by the tool. In the honing method for honing a hole, the tool includes a grinding abrasive grain portion having a slit that expands and contracts in the radial direction by the axial movement of the taper cone, and the main shaft rotates the taper cone by relative rotation with the main shaft. An extension drive shaft that moves in the axial direction is rotatably inserted, and is first positioned on the back side of the blind hole of the workpiece in a contracted state, and then the master servo motor that rotates the main shaft and the extension A child servo motor that rotationally drives the drive shaft is rotationally controlled so as to give a rotational phase difference between the two and the tip of the abrasive grain part is expanded, The main servo motor and the slave servo motor are controlled to rotate synchronously, and in that state, the tool is moved relative to the workpiece in the direction of pulling out from the blind hole, and honing is performed for the blind hole of the workpiece. Method. 6. The work piece according to claim 5, wherein a rotational phase difference applied between the parent servo motor and the child servo motor causes a workpiece to be processed at a cylindrical finishing portion at a tip portion of the grinding abrasive grain portion and a biting corner portion at a rear end side thereof. A honing method that expands the tip of the abrasive grain so that most of the blind hole allowance can be honed, and hovers the blind hole in the workpiece with a single pass.

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