JP2014008547A - Grinding machine of shaft-shaped workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding machine of a shaft-shaped workpiece, having a downsizable processing chamber and capable of achieving space-saving and cost reduction.SOLUTION: A grinding machine 1 of a shaft-shaped workpiece includes: a pressing mechanism part 7 for positioning the workpiece 5 in an axial direction by pressing one end face 5e of the workpiece 5 in the axial direction; a chuck device 2 for gripping an outer peripheral surface of the workpiece 5 brought into contact with a positioning member 12; and a grindstone unit 6 for rotating a grindstone 61 which grinds the workpiece 5 gripped by the chuck device 2. The pressing mechanism part 7 includes: an end face contacting member 71 for contacting the end face 5e of the workpiece 5; a dress member 72 for dressing the grindstone 61; a spindle 73 to which the end face contacting member 71 and the dress member 72 are attached; transferring means 74 for transferring the spindle 73 in the axial direction of the workpiece 5; and a motor 75 for rotating the spindle 73.

Description

  The present invention relates to a shaft-like workpiece grinding machine, and more particularly to a grinding machine that grips an outer peripheral surface of a shaft-like workpiece and grinds the workpiece.

  Gripping the outer peripheral surface of the shaft-shaped workpiece with the chuck device with the tip end side of the workpiece as the free end, rotating the spindle with the chuck device gripping the workpiece, and bringing the rotating grindstone into contact with the workpiece for grinding A grinding machine to perform is known (see, for example, Patent Document 1).

JP 2003-94288 A

  However, when gripping and grinding an axial workpiece in a cantilever manner using a chuck device, the workpiece is axially pressed to position the workpiece in the longitudinal direction (axial direction) of the workpiece relative to the chuck device. Therefore, it is necessary to install a pusher device to be moved in the processing chamber. In addition, a dressing device for dressing the surface of the grindstone needs to be installed in the processing chamber. For this reason, the processing chamber was large.

  Therefore, the processing chamber cover that covers the processing area is increased in order to prevent the coolant supplied when the workpiece is ground from being scattered, so that the installation space for the grinding machine is increased and the equipment cost is also increased. There was a problem.

  This invention is made in view of such a situation, and makes it a subject to provide the grinding machine of the shaft-shaped workpiece | work which can reduce a processing chamber and can implement | achieve space saving and cost reduction. .

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the pressing mechanism portion that presses one end surface of the shaft-shaped workpiece in the axial direction to position the workpiece in the axial direction, and the positioning by the pressing mechanism portion. A chuck device that grips the outer peripheral surface of the workpiece, and a grindstone unit that rotates a grindstone that grinds the workpiece gripped by the chuck device, and the pressing mechanism portion touches the end surface of the workpiece. A contactable end surface abutting member, a dressing member for dressing the grindstone, a support member to which the end surface abutting member and the dressing member are attached, and a moving means for moving the support member in the axial direction of the workpiece, A grinding machine for a shaft-like workpiece, comprising: a rotation driving means for rotating the support member.

According to the present invention, the pressing mechanism portion having a grindstone dressing function may be installed in the processing chamber together with the chuck device, and the processing chamber can be made small. Thereby, the processing chamber cover which covers a processing area is reduced in size. Moreover, the installation space for the grinding machine can be reduced, and the equipment cost can be reduced.
That is, it is possible to provide a shaft-like workpiece grinding machine that can reduce the size of the machining chamber and save space and reduce costs.

  The invention according to claim 2 is the grinding machine for the shaft-like workpiece according to claim 1, wherein the workpiece is contacted in the axial direction to position the workpiece in the axial direction. It is characterized by providing.

  According to this invention, the workpiece is pressed and moved by the operation of the moving means, and the workpiece is brought into contact with the axial positioning portion, whereby the axial positioning of the axial workpiece is utilized. And more accurately.

  The invention according to claim 3 is the shaft-like workpiece grinding machine according to claim 1 or 2, wherein when the workpiece is positioned in the axial direction, the rotation driving means is stopped and the movement is performed. The end face abutting member is moved toward the work by the operation of the means, and when the grindstone is dressed, the end face abutting member stops the moving means at a retracted position away from the work, and the rotation driving means It has a control part which performs control to operate.

  According to this invention, it can control so that a press mechanism part can selectively switch either the positioning function of a workpiece | work, and the dressing function of a grindstone, and can exhibit it favorably.

  The invention according to claim 4 is the grinding machine for a shaft-like workpiece according to any one of claims 1 to 3, wherein the dressing member has a disk shape and is formed of the support member. It is attached to the front end side, The said end surface contact member is attached to the center front end side of the said dress member, It is characterized by the above-mentioned.

  According to the present invention, when the workpiece is positioned, the dress member does not interfere with the pressing operation of the workpiece by the end surface abutting member, and when the grindstone is dressed, the end surface abutment against the dressing operation of the grindstone by the dress member. The members can be prevented from interfering with each other, and the end surface abutting member and the dressing member can be compactly attached to the support member, and the processing chamber can be further downsized.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the grinding machine of the shaft-shaped workpiece | work which can miniaturize a processing chamber and can implement | achieve space saving and cost reduction.

It is a top view showing typically the whole grinding machine composition concerning a 1st embodiment of the present invention. It is the expanded sectional view which cut | disconnected the periphery of the chuck | zipper apparatus shown by FIG. 1 by the vertical plane perpendicular | vertical to the axial center of the workpiece | work at the time of a process. It is the expanded sectional view which cut | disconnected the periphery of the chuck | zipper apparatus shown by FIG. 1 with the perpendicular plane along the axial center of the workpiece | work at the time of a process. It is a perspective view which shows a contact member, a workpiece | work, and a positioning member. It is a top view which shows typically the whole structure of the grinding machine which concerns on 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view of the periphery of the chuck device shown in FIG. 5 taken along a vertical plane perpendicular to the axis of the workpiece during machining. It is sectional drawing which cut | disconnected the periphery of the chuck | zipper apparatus shown by FIG. 5 by the vertical surface along the axial center of the workpiece | work at the time of a process.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
<< First Embodiment >>
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view schematically showing the overall configuration of the grinding machine according to the first embodiment of the present invention. FIG. 2 is an enlarged sectional view in which the periphery of the chuck device shown in FIG. 1 is cut by a vertical plane perpendicular to the axis of the workpiece during machining. FIG. 3 is an enlarged cross-sectional view in which the periphery of the chuck device shown in FIG. 1 is cut by a vertical plane along the axis of the workpiece during machining. Specifically, FIG. 2 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 3 is a cross-sectional view taken along line AA in FIG. In the following description, the horizontal direction in FIG. 1 is the Z-axis direction, and the vertical direction in FIG. 1 is the X-axis direction.

  As shown in FIG. 1, the grinding machine 1 holds the outer peripheral surface of a shaft-like workpiece 5 with a chuck device 2 with the tip side of the workpiece 5 as a free end, and the chuck device 2 that holds the workpiece 5 is attached. The grinding machine performs grinding by rotating the main spindle 81 and bringing the rotating grindstone 61 into contact with the workpiece 5.

  The shaft-like workpiece 5 is an eccentric shaft constituting a crank mechanism in which eccentric portions 5c and 5d called eccentric pins are formed, such as a compressor shaft. Here, the workpiece 5 includes a first journal portion 5a gripped by the chuck device 2, eccentric portions 5c and 5d having an eccentricity with respect to the axial center of the first journal portion 5a, and a tip (free end). It has a second journal part 5b which is located on the side and has a coaxial axis with the first journal part 5a. In order to stably hold the workpiece 5, the first journal portion 5a that is longer in the axial direction than the second journal portion 5b is held by the chuck device 2.

  The grinding machine 1 includes a bed 11 serving as a base. On the bed 11, a pressing mechanism unit 7, a spindle unit 8, and a grindstone unit 6 are disposed. The pressing mechanism unit 7 has a function of pressing one end face 5e of the workpiece 5 in the axial direction to position the workpiece 5 in the axial direction. A chuck device 2 that holds the outer peripheral surface of the workpiece 5 positioned by the pressing mechanism unit 7 is mounted on the distal end side of the spindle unit 8. The grindstone unit 6 processes the workpiece 5 gripped by the chuck device 2, and the grindstone unit 6 rotates a grindstone 61 that grinds the workpiece 5.

  Further, the grinding machine 1 is provided with an operation unit 9 including a power switch, operation buttons, and the like (not shown), and a control unit 10 that comprehensively controls the operation of each unit in the grinding machine 1.

  The spindle unit 8 includes a rotatable spindle 81 and a motor 82 that rotates the spindle 81 via, for example, a coupling (not shown). The chuck device 2 is attached to the tip of the main shaft 81, and the work 5 is gripped by the chuck device 2 so as to be rotatable around the axis of the main shaft 81.

  The pressing mechanism unit 7 includes a contact member 71 that can contact the workpiece 5, a dress member 72 that dresses (dresses) the grindstone 61, and a spindle (support member) 73 to which the contact member 71 and the dress member 72 are attached. , A moving means 74 for moving the spindle 73 in the axial direction (Z-axis direction) of the workpiece 5, and a motor (rotary driving means) 75 for rotating the spindle 73 via a coupling (not shown), for example. ing.

  The dress member 72 has a disk shape and is attached to the tip end side of the spindle 73. As the dress member 72, for example, a rotary dresser in which diamond abrasive grains are embedded is used.

  The contact member 71 includes an end surface contact member 711 that can contact the end surface 5e of the workpiece 5, and a side surface contact member 712 that can contact the side surface (outer peripheral surface) of the eccentric portion 5d. The contact member 71 is attached to the center front end side of the dress member 72.

  The moving means 74 includes a motor 74a installed on the bed 11, a ball screw 74b rotated by the motor 74a through, for example, a coupling (not shown), a nut portion 74c screwed to the ball screw 74b, The nut part 74c is provided with the moving table 74d by which a lower surface is fixed. Here, the rotation of the ball screw 74b by the motor 74a moves the moving table 74d in the Z-axis direction by a feeding action that moves the nut portion 74c in the axial direction. The moving table 74d is configured to be movable in the Z-axis direction on the bed 11 by a known linear motion guide device (not shown), and a motor 75 for rotating the spindle 73 is placed on the moving table 74d. Is installed.

  The grindstone unit 6 has a motor 63 that rotates a rotating shaft 62 of a rotatable grindstone 61. Here, the motor 63 is a built-in motor disposed on the outer peripheral side of the rotary shaft 62, but is not limited to this, and the rotary shaft 62 is rotated via a driving force transmission member such as a belt or a gear. The structure to be made may be employ | adopted.

  The grindstone unit 6 includes a Z-axis moving table 64 that is arranged on the bed 11 and is movable in the Z-axis direction, and a grindstone table 65 that is arranged on the Z-axis moving table 64 and is movable in the X-axis direction. ing. A motor 63 is installed on the grindstone table 65, and the motor 63 is connected to the grindstone 61 via a rotating shaft 62. Further, a grindstone cover 66 is attached to the grindstone base 65 so as to expose only the front end (work 5 side) of the grindstone 61 and cover the entire rear part (opposite side of the work 5) of the grindstone 61.

  The Z-axis moving table 64 and the grindstone table 65 are configured to be movable in the Z-axis direction and the X-axis direction, respectively, by a known linear motion guide device (not shown). Further, the Z-axis moving table 64 and the grindstone table 65 are moved in the Z-axis direction by the feeding action of a ball screw mechanism (not shown) having a ball screw rotated by a motor and a nut portion screwed to the ball screw. Each can be moved in the X-axis direction.

  Further, in the grinding machine 1, a processing chamber cover 13 that covers the processing region of the workpiece 5 by the grindstone 61 is installed on the bed 11 in order to prevent the coolant supplied when the workpiece 5 is ground from being scattered. Yes. The inside of the processing chamber cover 13 becomes a processing chamber.

  As shown in FIGS. 2 and 3, the chuck device 2 includes a chuck body 21 attached to the tip end side of a main shaft 81 (see FIG. 1), and a first clamp that is provided on the chuck body 21 and supports the outer peripheral surface of the workpiece 5. A portion 22, a substantially L-shaped arm 24 connected to the chuck body 21 so as to be rotatable around a rotation shaft 23, and a workpiece 5 provided between the arm 24 and the first clamp portion 22. A second clamp part 25 and an arm drive part 26 for turning the arm 24 around the turning shaft 23 are provided. 2 and 3, the clamped state in which the workpiece 5 is gripped is indicated by a solid line, and the unclamped state is indicated by a two-dot chain line.

  The chuck body 21 is provided integrally with a disc-shaped mounting portion 21a fixed to the tip of the main shaft 81 (see FIG. 1) by screw fastening or the like, and protrudes to the opposite side of the main shaft 81 of the mounting portion 21a. And a support portion 21b. A circular recess 21c is formed at the center of the mounting portion 21a opposite to the main shaft 81, and a positioning member 12 for positioning the workpiece 5 is fitted into the recess 21c and fixed by screw fastening or the like. ing.

  The first clamp portion 22 is a V block having a V-shaped gripping surface 22a, and is fitted into a recess 35 formed in the support portion 21b of the chuck body 21, and is supported by the support portion 21b of the chuck body 21 by screw fastening or the like. It is fixed to. Two first clamp portions 22 are attached side by side in the Z-axis direction. The second clamp portion 25 is formed in a size that covers the two first clamp portions 22 in plan view when the workpiece 5 is clamped. However, the second clamp portion 25 may be formed so as to be positioned between the two first clamp portions 22 in plan view when the workpiece 5 is clamped. Or the 2nd clamp part 25 is provided with a pair of part divided | segmented into two, and the said pair of part may be provided in the position corresponding to the two 1st clamp parts 22, respectively.

  The arm drive unit 26 includes a link member 28 that is rotatably connected around the first pin 27 in the vicinity of the end of the substantially L-shaped arm 24 on the side opposite to the second clamp unit 25, and the link member 28. A rod 30 is rotatably connected around the second pin 29 in the vicinity of the end opposite to the first pin 27. A piston 31 is fixed to the end of the rod 30 opposite to the second pin 29 by screw fastening or the like. The piston 31 is inserted into the rod 30 in the cylinder bore 32 formed in the support portion 21b of the chuck body 21. Are slidably housed along the longitudinal direction (X-axis direction). A hydraulic chamber 34 is formed on the front side of the piston 31 (the right side in FIG. 2).

  The piston 31 is urged to the right in FIG. 2 together with the rod 30 by an elastic member 33 such as a coil spring when the hydraulic pressure of a predetermined pressure is not supplied to the hydraulic chamber 34. As a result, the arm 24 is rotated counterclockwise in FIG. 2, and the chuck device 2 is in an unclamped state (a state indicated by a two-dot chain line in FIG. 2). On the other hand, when a predetermined hydraulic pressure is supplied to the hydraulic chamber 34, the piston 31 moves to the left in FIG. 2, and the rod 30 moves accordingly. As a result, the arm 24 is rotated clockwise in FIG. 2, and the chuck device 2 grips the workpiece 5 and enters a clamped state (state indicated by a solid line in FIG. 2).

FIG. 4 is a perspective view showing a contact member, a workpiece, and a positioning member.
As shown in FIGS. 3 and 4, the contact member 71 includes an end surface contact member 711 and a side surface contact member 712. A pair of side surface abutting members 712 are provided on the end surface abutting member 711, and a pair of side surface abutting members 712 are disposed on the radially outer side of the abutting portion 711 a that is a portion that abuts the workpiece 5 of the end surface abutting member 711. If comprised in this way, the end surface contact member 711 in the state by which the side surface contact member 712 was provided will be attached to the spindle 73 (refer FIG. 1) via the dress member 72 (refer FIG. 1) easily and compactly. Can do. However, the end surface contact member 711 and the side surface contact member 712 may be separated from each other and attached to the spindle 73 via the dress member 72.

  The end surface contact member 711 has, for example, a cylindrical shape. In FIG. 4, the contact portion 711 a has the same height (the same surface) as the other portions, but may be a concave portion or a convex portion. The side contact member 712 has, for example, a rod shape, and is erected by, for example, being screwed into the end surface of the end surface contact member 711 on the workpiece 5 side.

  The positioning member 12 includes an axial positioning portion 12a for positioning the workpiece 5 in the axial direction and a circumferential positioning portion 12b for positioning the workpiece 5 in the circumferential direction. The axial direction positioning portion 12a has, for example, a substantially cylindrical shape. The end surface 12c on the workpiece 5 side of the axial direction positioning portion 12a is in contact with the end surface 5f of the workpiece 5 when the workpiece 5 is positioned in the axial direction. On the other hand, on the end surface of the axial positioning portion 12a opposite to the work 5, for example, a rectangular parallelepiped-shaped rotation preventing portion fitted into a groove-shaped engaging recess 21d formed at the bottom of the recess 21c of the mounting portion 21a. 12d is provided.

  The circumferential positioning portion 12b has, for example, a trapezoidal plate shape, and is provided to protrude from the end surface 12c on the workpiece 5 side of the axial positioning portion 12a. The circumferential positioning portion 12b is inserted into and engaged with a groove portion 5g as an engaged portion provided on the end surface 5f of the workpiece 5 when the workpiece 5 is positioned in the circumferential direction.

Next, the operation of the grinding machine 1 configured as described above will be described.
When the shaft-like workpiece 5 is carried into the grinding machine 1 by an operator, the workpiece 5 is positioned on the grinding machine 1. The shaft-like workpiece 5 may be carried into the grinding machine 1 by a conveying device (not shown). At this time, the contact member 71 is moved to a retracted position separated from the work 5. Further, the arm 24 is rotated counterclockwise in FIG. 2 by the urging force of the elastic member 33, and the chuck device 2 is in an unclamped state.

  When positioning the workpiece 5, the control unit 10 first performs control to stop the motor 75 and move the contact member 71 toward the workpiece 5 by the operation of the moving means 74. When the contact member 71 is moved toward the workpiece 5 and the tip of the side contact member 712 of the contact member 71 contacts the end surface of the eccentric portion 5d, the control unit 10 temporarily After the control of retreating 71 in a direction away from the workpiece 5 and rotating the contact member 71 by a predetermined angle by the operation of the motor 75, the motor 75 is stopped again and the contact member 71 is directed toward the workpiece 5. Control to move. Thereby, the side surface contact member 712 is positioned to the side of the eccentric portion 5d of the workpiece 5. However, by providing a receiving member (not shown) that holds the eccentric portions 5c and 5d of the workpiece 5 in a substantially constant direction so as to be able to advance and retreat with respect to the workpiece 5, the tip of the side surface contact member 712 has the eccentric portion 5d. It may be configured so as to avoid a situation where it abuts against the end face of each other.

  When the end surface abutting member 711 of the abutting member 71 abuts on one end surface 5e of the work 5 and presses and moves the work 5, the other end surface 5f of the work 5 abuts against the tip of the circumferential positioning portion 12b. Stop in contact. Then, for example, based on the position of the moving table 74d where the contact member 71 is disposed, it is detected that the circumferential positioning portion 12b is not yet engaged with the groove portion 5g of the workpiece 5. In this case, the control unit 10 causes the side contact member 712 of the contact member 71 to rotate in a fixed direction around the rotation center of the spindle 73 by the operation of the motor 75 to contact the side surface of the eccentric portion 5d of the workpiece 5. Then, the workpiece 5 is rotated around its axis. When the workpiece 5 is rotated and the groove portion 5g of the workpiece 5 comes to a position opposite to the circumferential positioning portion 12b, the workpiece 5 is continuously pressed in the axial direction, so that the circumferential positioning portion 12b becomes the groove portion 5g of the workpiece 5. And the end surface 5f on the base end side of the workpiece 5 comes into contact with the end surface 12c on the workpiece 5 side of the axial positioning portion 12a.

  In this way, the pressing mechanism unit 7 presses the workpiece 5 by the operation of the moving means 74 and positions the workpiece 5 in the axial direction. Here, the workpiece 5 is pressed in the axial direction, moved until the end surface 5f of the workpiece 5 comes into contact with the end surface 12c of the axial positioning portion 12a of the positioning member 12 provided in advance, and is positioned in the axial direction. . Further, the pressing mechanism unit 7 rotates the workpiece 5 by the operation of the motor 75 to position the workpiece 5 in the circumferential direction. Here, the workpiece 5 is rotated in a certain direction, the circumferential positioning portion 12b is inserted into the groove portion 5g of the workpiece 5, and one side surface in the groove portion 5g is brought into contact with the circumferential positioning portion 12b. And positioned in the circumferential direction.

  Subsequently, the chuck device 2 grips the outer peripheral surface of the workpiece 5 positioned by the pressing mechanism unit 7. After the gripping of the work 5 is completed, the contact member 71 is moved to a retracted position away from the work 5 by the operation of the moving means 74.

  Subsequently, when the spindle 81 of the spindle unit 8 is rotated, the workpiece 5 held by the chuck device 2 is rotated. Further, the grindstone 61 of the grindstone unit 6 is rotated. Then, the rotating grindstone 61 is brought into contact with the workpiece 5 to perform grinding.

  Here, the outer peripheral surfaces of the eccentric portions 5c and 5d of the workpiece 5 are ground. In this case, the workpiece 5 is rotated by a well-known grinding method that accurately synchronizes the rotational motion of the workpiece 5 around the axis of the spindle 81 and the reciprocating motion of the grinding wheel base 65 in the X-axis direction perpendicular to the axis of the spindle 81. The five eccentric portions 5c and 5d are ground with high accuracy.

  On the other hand, the dressing of the grindstone 61 is performed when a predetermined processing time or the number of processing passes. When the grindstone 61 is dressed, the control unit 10 performs control to stop the moving means 74 at the retracted position where the contact member 71 is separated from the workpiece 5 and to rotate the dress member 72 by operating the motor 75. Further, the grindstone 61 of the grindstone unit 6 is rotated. Then, while the grindstone 61 and the dressing member 72 are rotated, the outer peripheral surface of the grindstone 61 is moved close to the position where the outer peripheral surface of the dressing member 72 comes into contact with the movement of the Z-axis moving table 64 and the grindstone base 65. The outer peripheral surface 61 is dressed.

  As described above, the grinding machine 1 for the shaft-like workpiece according to the first embodiment presses one end face 5e of the workpiece 5 in the axial direction to position the workpiece 5 in the axial direction, A chuck device 2 that grips the outer peripheral surface of the work 5 positioned by the pressing mechanism unit 7 and a grindstone unit 6 that rotates a grindstone 51 that grinds the work 5 gripped by the chuck device 2 are provided. The pressing mechanism unit 7 includes an end surface contact member 711 that contacts the end surface 5e of the workpiece 5, a dress member 72 that dresses the grindstone 61, and a spindle 73 to which the end surface contact member 711 and the dress member 72 are attached. , A moving means 74 for moving the spindle 73 in the axial direction of the workpiece 5 (Z-axis direction), and a motor 75 for rotating the spindle 73.

  Therefore, according to the first embodiment, the pressing mechanism portion 7 that also has the dressing function of the grindstone 61 may be installed in the processing chamber together with the chuck device 2 that grips the outer peripheral surface of the workpiece 5, thereby reducing the processing chamber. be able to. Thereby, the processing chamber cover 13 covering the processing area is reduced in size. Moreover, the installation space of the grinding machine 1 can be reduced, and the equipment cost can be reduced.

  In other words, it is possible to provide a grinding machine 1 for a shaft-like workpiece that can reduce the size of the processing chamber and can realize space saving and cost reduction.

  Moreover, in 1st Embodiment, the workpiece | work 5 contact | abuts to an axial direction, and the axial direction positioning part 12a for positioning the said workpiece | work 5 to an axial direction is provided. According to such a configuration, the workpiece 5 is pressed and moved by the operation of the moving means 74 to bring the workpiece 5 into contact with the axial positioning portion 12a, thereby positioning the axial workpiece 5 in the axial direction. This can be performed more accurately by using the axial direction positioning portion 12a.

  In the first embodiment, when the workpiece 5 is positioned in the axial direction, the motor 75 is stopped and the abutting member 71 is moved toward the workpiece 5 by the operation of the moving means 74. A control unit 10 is provided that performs control for stopping the moving means 74 and operating the motor 75 at the retracted position where the member 71 is separated from the workpiece 5. According to such a configuration, the pressing mechanism unit 7 can be controlled so as to selectively switch between the positioning function of the workpiece 5 and the dressing function of the grindstone 61.

  In the first embodiment, the dress member 72 has a disk shape and is attached to the tip end side of the spindle 73, and the contact member 71 is attached to the center tip end side of the dress member 72. According to such a configuration, when the workpiece 5 is positioned, the dress member 72 does not interfere with the pressing operation of the workpiece 5 by the contact member 71, and when the grindstone 61 is dressed, the grindstone 61 by the dress member 72 The abutting member 71 can be prevented from interfering with the dressing operation, and the abutting member 71 and the dressing member 72 can be compactly attached to the spindle 73, and the processing chamber can be further downsized.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a plan view schematically showing the overall configuration of the grinding machine according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of the periphery of the chuck device shown in FIG. 5 taken along a vertical plane perpendicular to the axis of the workpiece during machining. FIG. 7 is a cross-sectional view of the periphery of the chuck device shown in FIG. 5 taken along a vertical plane along the workpiece axis during machining. Specifically, FIG. 6 is a cross-sectional view taken along line DD in FIG. 7, and FIG. 7 is a cross-sectional view taken along line CC in FIG.

  The same configurations and operations as those of the first embodiment shown in FIGS. 1 to 4 are omitted as detailed in the second embodiment shown in FIGS. 5 to 7, and different points will be described.

  As shown in FIG. 5, in the second embodiment, the configuration of the chuck device is different from that of the first embodiment. In the second embodiment, the workpiece 5 is inserted into the hole 181a (see FIG. 7) formed on the distal end side of the main shaft 181 of the main shaft unit 108 through the chuck device 102, and is then inserted by the chuck device 102. It is different from the first embodiment in that it is gripped.

  As shown in FIGS. 6 and 7, the chuck device 102 includes a chuck main body 121 attached to the front end side of the main shaft 181, a first clamp portion 122 provided on the chuck main body 121 and supporting the outer peripheral surface of the workpiece 5, and a chuck A substantially straight arm 124 that is swingably connected to the main body 121, a second clamp portion 125 that is provided on the arm 124 and clamps the workpiece 5 between the first clamp portion 122, and the arm 124. And an arm driving unit 126 to be moved. 6 and 7 show a clamped state in which the workpiece 5 is gripped.

  The chuck main body 121 includes a disc-shaped mounting portion 121a that is fixed to the tip of the main shaft 181 by screw fastening or the like, and a support portion 121b that is integrally provided so as to protrude to the opposite side of the main shaft 181 of the mounting portion 121a. Have. Near the center of the attachment portion 121a, a through hole 121c having an oval cross section as an insertion portion through which the workpiece 5 is inserted when the workpiece 5 is gripped is formed to open to the main shaft 181 side. On the other hand, a circular hole 181a into which the workpiece 5 is inserted through the through hole 121c when the workpiece 5 is gripped is formed in the center on the front end side of the main shaft 181. A circular recess 181b is formed at the bottom of the hole 181a, and the positioning member 112 is fitted into the recess 181b and fixed by screw fastening or the like.

  The first clamp portion 122 is configured by integrally forming a pair of V block portions 122b having a V-shaped gripping surface 122a and arranged in the Z-axis direction on a substantially rectangular parallelepiped base portion 122c. In the second embodiment, the V block portion 122b of the first clamp portion 122 functions as an axial positioning portion for positioning the workpiece 5 in the axial direction. In other words, the end surface 5h of the stepped portion of the workpiece 5 is brought into contact with the end surface of the V block portion 122b when the workpiece 5 is positioned in the axial direction.

  The first clamp part 122 is fitted into a recess 135 formed in the support part 121 b of the chuck main body 121, and is fixed to the support part 121 b of the chuck main body 121 by a screw member 136. However, the 1st clamp part 122 may be divided | segmented into two parts each having the V block part 122b, or it is comprised so that one V block part may be provided in the position facing the 2nd clamp part 125. FIG. May be.

  The arm drive unit 126 has a rod 130 that is swingably connected via a spherical washer 138 near the tip of the swing shaft 123 opposite to the swing shaft 123 that is the swing center of the substantially straight arm 124. . A male screw part 139 is formed on the arm 124 side of the rod 130, and the nut 130 is screwed into the male screw part 139, whereby the rod 130 is connected to the arm 124. A piston 131 is provided on the opposite side of the rod 130 from the arm 124, and the piston 131 is disposed in the longitudinal direction of the rod 130 (the vertical direction in FIG. 6) in the cylinder bore 132 formed in the support portion 121 b of the chuck body 121. ) Is slidably housed along. A hydraulic chamber 134 is formed on the front side of the piston 131 (lower side in FIG. 6).

  The piston 131 urges the rod 130 downward in FIG. 6 by an elastic member 133 such as a disc spring when the hydraulic pressure of the predetermined pressure is not supplied to the hydraulic chamber 134. As a result, the arm 124 is pivoted clockwise in FIG. 6 about the pivot shaft 123, and the chuck device 102 grips the workpiece 5 and enters a clamped state (the state shown in FIG. 6). On the other hand, when a predetermined hydraulic pressure is supplied to the hydraulic chamber 134, the piston 131 moves upward in FIG. 6, and the rod 130 moves accordingly. As a result, the arm 124 is swung counterclockwise in FIG. 6, and the chuck device 102 is in an unclamped state (not shown).

  As shown in FIG. 7, the positioning member 112 includes a base portion 112 a having a substantially cylindrical shape and a circumferential direction positioning portion 112 b for positioning the workpiece 5 in the circumferential direction. In the second embodiment, when the workpiece 5 is positioned in the axial direction, a gap is formed between the end surface 5f of the workpiece 5 and the end surface 112c of the base portion 112a on the workpiece 5 side. However, similarly to the first embodiment, the end surface 5f of the workpiece 5 may be in contact with the end surface 112c of the base portion 112a so that the workpiece 5 is positioned in the axial direction. In this case, the base portion 112a functions as an axial positioning portion for positioning the workpiece 5 in the axial direction by contacting the workpiece 5 in the axial direction. On the other hand, an end face of the base 112a opposite to the workpiece 5 is provided with, for example, a rectangular parallelepiped anti-rotation portion 112d fitted into a groove-shaped engaging recess 181c formed at the bottom of the recess 181b.

  The circumferential positioning portion 112b has, for example, a trapezoidal plate shape, and is provided to protrude from the end surface 112c on the workpiece 5 side of the base portion 112a. The circumferential positioning portion 112b is inserted into and engaged with a groove portion 5g as an engaged portion provided on the end surface 5f of the workpiece 5 when the workpiece 5 is positioned in the circumferential direction.

  In the second embodiment, the second clamp portion 125 (the point of action) is formed by a swing shaft 123 serving as a swing center (fulcrum) of the arm 124 and a connecting portion (power point) between the arm 124 and the arm driving unit 126. In between, it is fixed to the arm 124 by a screw member 137. Specifically, when viewed from the front end side of the workpiece 5 at the time of gripping, a connecting portion with the arm driving unit 126 in the arm 124 is disposed on either the left or right side of the workpiece 5 (right side in FIG. 6). On the other side (left side in FIG. 6), a swing shaft 123 serving as a swing center of the arm 124 is disposed.

  According to such a 2nd embodiment, in addition to having the same operation effect as a 1st embodiment mentioned above, the following operation effects can be produced. That is, based on the principle of the lever, it is possible to ensure a large gripping force of the workpiece 5 with a small driving force by the arm driving unit 126 as compared with the first embodiment described above. Therefore, the chuck device 102 can be further downsized while holding a gripping force that can hold the workpiece 5 reliably.

In the second embodiment, as described above, the base portion 112a may be configured to function as an axial positioning portion. According to this configuration, the workpiece 5 is inserted into the hole 181a of the main shaft 181 and brought into contact with the base portion 112a of the positioning member 112 installed at the bottom of the hole 181a so that the chuck is positioned in the axial direction. The workpiece 5 can be gripped by the apparatus 102. As a result, a portion closer to the grinding portion of the workpiece 5 can be stably held, and the distance from the tip of the spindle 181 to the tip of the workpiece 5 can be reduced, and the chuck device 102 and thus the grinding machine 1 can be further downsized. This saves more space.
Further, if the hole 181a of the main shaft 181 is formed to be deep to some extent, the axial dimension of the positioning member 112 including the base 112a functioning as the axial positioning part can be changed even for the workpiece 5 having different axial dimensions. Therefore, it is possible to cope with the minimum change.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure described in each above-mentioned embodiment, The combination thru | or selected suitably the structure described in each embodiment. In the range which does not deviate from the meaning, the structure can be changed suitably.

  For example, the workpiece 5 is positioned in the axial direction by pressing the workpiece 5 until it is in contact with the axial positioning portion 12a. However, the present invention is not limited to this. The distance by which the workpiece 5 is moved may be controlled by controlling the above. Further, the circumferential positioning of the workpiece 5 is performed by rotating the workpiece 5 and engaging the circumferential positioning portion 12b with the groove portion 5g of the workpiece 5 in the embodiment, but is not limited thereto. Alternatively, the angle at which the workpiece 5 is rotated may be controlled by controlling the motor 75.

  Moreover, although the said embodiment demonstrated and demonstrated the compressor shaft which has the two eccentric parts 5c and 5d as an axial workpiece | work used as grinding object, this invention is not limited to this. The present invention is also applicable to grinding various types of shaft-like workpieces such as a compressor shaft and a cam shaft having one eccentric portion, and a shaft not having an eccentric portion.

  Further, the motor (rotation driving means) 75 may be configured to rotate the spindle 73 via a driving force transmission member such as a belt or a gear.

DESCRIPTION OF SYMBOLS 1 Grinding machine 2 Chuck apparatus 5 Work 5e End surface 7 Pressing mechanism part 10 Control part 12a Axial direction positioning part 13 Processing chamber cover 61 Grinding wheel 711 End surface contact member 72 Dress member 73 Spindle (support member)
74 Moving means 75 Motor (rotational drive means)
102 Chuck device 122b V block part (axial positioning part)
181a hole 181 spindle

Claims (4)

A pressing mechanism that presses one end face of the shaft-shaped workpiece in the axial direction to position the workpiece in the axial direction;
A chuck device for gripping the outer peripheral surface of the workpiece positioned by the pressing mechanism;
A grindstone unit that rotates a grindstone that grinds the workpiece gripped by the chuck device, and
The pressing mechanism includes an end surface abutting member that can abut on the end surface of the workpiece, a dress member that dresses the grindstone, a support member to which the end surface abutting member and the dress member are attached, and the support member A grinding machine for an axial workpiece, comprising: a moving means for moving the workpiece in the axial direction of the workpiece; and a rotation driving means for rotating the support member.   The shaft-like workpiece grinding machine according to claim 1, further comprising an axial positioning portion for abutting the workpiece in the axial direction to position the workpiece in the axial direction.   When positioning the workpiece in the axial direction, the rotation driving means is stopped and the moving means is operated to move the end face abutting member toward the work. When the grindstone is dressed, the end face abutting member is The shaft-shaped workpiece grinding machine according to claim 1 or 2, further comprising a control unit that performs control to stop the moving unit and operate the rotation driving unit at a retracted position separated from the workpiece. . The dress member has a disk shape and is attached to the distal end side of the support member,
The shaft end workpiece grinding machine according to any one of claims 1 to 3, wherein the end surface abutting member is attached to a center front end side of the dress member.

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