JP5751197B2 - Workpiece support device and machine tool - Google Patents

Description

  The present invention relates to a workpiece support device and a machine tool that support a workpiece.

  A machine tool such as a machining center supports a workpiece (hereinafter referred to as a workpiece) on a table and performs various processes such as milling and tapping with a tool attached to a processing spindle. The machine tool includes a spindle head that rotatably supports a spindle on which a tool is mounted, a Z-axis moving device that reciprocates the spindle head in a vertical direction (Z-axis direction), and a spindle head in two horizontal directions (X-axis and (Y-axis direction) provided with an XY-axis moving device that reciprocates in each direction and a main-axis driving device that rotationally drives the main shaft. The table that supports the workpiece may be fixed to the base of the machine tool, or may be configured to rotate the workpiece around an axis parallel to the Z axis, for example. In addition to the movement of the main shaft, more complex machining is possible by rotating the workpiece (Patent Document 1, etc.).

  In general, when a workpiece is rotated about axes parallel to the X, Y, and Z axes that are axes for moving the machining spindle, the rotation axes of the workpiece correspond to the X, Y, and Z axes. It is called the C axis. For example, Patent Document 2 discloses a workpiece support device that supports a workpiece so that the A axis and the C axis can rotate. In the work support device, a U-shaped box-shaped oscillating body called a cradle is supported by a vertical support so as to be able to rotate on the A axis, and the work is supported by a C-axis rotation driving unit disposed inside the oscillating body. The supporting table (rotary table) is configured to rotate in the C axis. The C-axis rotation drive unit has a power transmission mechanism connected to one end of the drive shaft that penetrates the support, and rotates the table by C-axis by applying a drive force to the other end of the drive shaft. In addition, the table can be rotated on the C axis by providing a drive motor inside the rocking body.

JP 2010-194617 A JP-A-62-84941

  However, since the workpiece support device described in Patent Document 2 has the C-axis rotation drive unit disposed inside the oscillator, it accesses each mechanical component and drive motor constituting the C-axis rotation drive unit. There was a problem that it was not possible to maintain and lacked maintainability. In addition, since the rocking body is formed in a box shape, and the visual observation of the bottom of the rocking body further downward is restricted, there is a problem that it is difficult to inspect.

  In addition, when a drive motor is provided inside the rocking body, a power supply line for supplying power to the drive motor is required. Depending on the wiring method, the rocking body may be swung. There was also a problem of becoming a load.

  The present invention has been made in view of such circumstances, and makes it easy to access an oscillating body to which a rotation drive unit for rotating a turntable is attached, and further suppresses a load caused by a power supply line to the rotation drive unit. It is an object of the present invention to provide a workpiece support device and a machine tool that can be used.

  A workpiece support apparatus according to the present invention rotates a rotating table by a rotation driving unit attached to an oscillating body supported so as to be swingable by the supporting body, and places the workpiece on the rotating table. In the workpiece support device to be supported, the rocking body is disposed in a shaft portion supported so as to be rockable on the support body, and is spaced apart from one end portion of the shaft portion in the axial direction. A base is provided on one surface side, a substrate in which the rotational drive unit is disposed on the other surface side, and a through hole that connects the one end portion and the substrate and penetrates from the one surface side to the other surface side are provided. It has a certain connection part.

  In the present invention, the shaft portion is swingably supported by the support body, and the substrate to which the rotation driving portion is attached is disposed apart from one end portion of the shaft portion in the axial direction. On one surface side of the substrate, a work table is placed and supported, and a turntable rotated by a rotation drive unit is provided. On the other side, a rotation drive unit is provided. The connecting portion that connects one end portion of the shaft portion and the substrate is provided with a through-hole penetrating from the one surface side to the other surface side. Therefore, accessibility from one surface side of the oscillator to the other surface side is provided. Becomes better.

  In the workpiece support device according to the present invention, the connecting portion has two beam members, and the two beam members are arranged so that a distance on the substrate side is wider than a distance on the one end side. It is characterized by being.

  In the present invention, the connecting portion has two beam members, and the rigidity of the oscillator is ensured by the two beam members. Since the distance between the two beam members is wider on the substrate side than the one end side of the shaft portion, a truss structure is formed by the two beam members and the peripheral edge portion of the substrate. Moreover, a comparatively large through-hole can be provided between two beam members, and the accessibility from the said one surface side to the said other surface side becomes favorable.

  The workpiece support device according to the present invention is characterized in that each of the two beam members is wider at the one end side than at the substrate side.

  In the present invention, each of the two beam members has a wider end portion than the substrate side, so that the rigidity of the connecting portion is increased.

  The workpiece support device according to the present invention is characterized in that each of the two beam members has a substantially L-shaped cross section.

  In the present invention, since each of the two beam members has a substantially L-shaped cross section, the rigidity of the beam member is increased.

  In the workpiece support device according to the present invention, the shaft portion has a cylindrical shape, one end side faces the through-hole, and a power supply line for supplying power to the rotation drive portion is provided inside the shaft portion. It is characterized by being inserted.

  In the present invention, the shaft portion of the oscillator is cylindrical, and one end side of the shaft portion faces the through hole. A power supply line for supplying power to the rotation drive unit is inserted into the shaft portion. When the oscillating body oscillates, the power supply line can be deformed so as to be twisted on the axis of the shaft portion, and the load when the oscillating body is oscillated is suppressed. Further, since the power supply line can be accessed from the one surface side of the substrate through the through hole, the workability in the work of inserting the power supply line into the shaft part and the work of attaching and detaching the power supply line to the rotary drive part is good.

  The workpiece support device according to the present invention is detachably attached to the connecting portion, and includes a cover that covers the through hole.

  In this invention, the cover which covers a through-hole is attached to the connection part so that attachment or detachment is possible, and this cover prevents the penetration of cutting waste and coolant into the through-hole. By removing the cover, the accessibility from one surface side of the substrate to the other surface side of the oscillator becomes good.

  In the workpiece support device according to the present invention, the cover has a recess facing the one surface side, and the bottom of the recess is fitted into the through hole.

  In the present invention, the cover covering the through hole has a recess facing one side of the substrate, and the bottom of the recess is fitted into the through hole. The cover attached to the connecting portion shields the through hole and at the same time partitions the space on the one surface side of the substrate on which the turntable is disposed, that is, the space on which the workpiece is placed. Since the cover has a concave portion facing the one surface side of the substrate, the space in which the workpiece is placed can be made wider.

  A machine tool according to the present invention includes the above-described workpiece support device and a processing spindle device that processes the workpiece supported by the workpiece support device.

  In the present invention, the workpiece supported by the workpiece support device can be cut by the machining spindle device.

  The machine tool according to the present invention is characterized in that the workpiece is rotated by the rotary drive unit and the workpiece is turned.

  In the present invention, the workpiece can be turned by rotating the workpiece by the rotation drive unit.

  According to the present invention, the shaft portion is swingably supported by the support body, and the substrate to which the rotation driving portion is attached is disposed apart from the one end portion of the shaft portion in the axial direction. On one surface side of the substrate, a work table is placed and supported, and a turntable rotated by a rotation drive unit is provided. On the other side, a rotation drive unit is provided. A through-hole penetrating from the one surface side to the other surface side is provided in the connecting portion that connects the one end portion of the shaft portion and the substrate. For this reason, the accessibility from the one surface side of the substrate of the oscillator to the other surface side is improved.

1 is a perspective view of a machine tool according to an embodiment. It is a front view of a machine tool. It is a right view of a machine tool. It is a perspective view of the machine tool which abbreviate | omitted the cover etc. which cover a guide rail. It is a front side perspective view of a workpiece | work support apparatus. It is a back side perspective view of a workpiece support device. It is a vertical front view of a workpiece support device. It is a front side perspective view of a rocking body. It is a back side perspective view of a rocking body. It is a top view of a rocking body. It is a bottom view of a rocking body. It is sectional drawing by the AA line in FIG. It is a top view of the rocking body concerning a modification. It is a front view of the rocking body concerning a modification.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing a machine tool according to the embodiment. In the following description, up and down, left and right, and front and rear indicated by arrows in the figure are used. 1 is a perspective view of the machine tool 100, FIG. 2 is a front view of the machine tool 100, FIG. 3 is a right side view of the machine tool 100, and FIG. 4 is a machine in which a cover and the like covering the guide rail are omitted. 1 is a perspective view of a machine 100. FIG. The operator operates the machine tool 100 in the front and attaches / detaches the workpiece.

  The machine tool 100 includes a base 10, a Y-direction moving device 20, an X-direction moving device 21, a column 22, a Z-direction moving device 23, a spindle head (processing spindle device) 25, a workpiece support device (workpiece support device) 30, and the like. Is provided. The machine tool 100 supports a workpiece (workpiece) with the workpiece support device 30 and processes the workpiece with a tool 26 attached to the spindle head 25. The tool 26 is detachably attached to the lower end portion of the spindle head 25 and can be changed by a tool changer (not shown).

  The base 10 includes a gantry 11, a spindle base 13, work bases 14 and 14 and the like. The gantry 11 is a substantially rectangular parallelepiped structure that is long in the front-rear direction. Four legs 12, 12,... That can be adjusted in height are provided at the four corners of the lower part of the gantry 11. The legs 12, 12, ... are arranged on the floor surface. The gantry 11 includes a bottom plate 11a, a side plate 11b, an upper plate 11c, and support plates 11d and 11d inside. The bottom plate 11a has a rectangular shape in plan view. The side plate 11b is connected to the four sides of the bottom plate 11a and surrounds the front, rear, left and right. The upper plate 11c has a deep dish shape having a rectangular shape in plan view, and four sides are fixed to the inner peripheral surface of the upper end portion of the side plate 11b. The upper plate 11 c has a through hole 11 e at a position below the work support device 30. Cutting chips, coolant, and the like generated by the processing fall downward through the through hole 11e and are collected by a collecting device (not shown). Each of the support plates 11d and 11d is erected upward from the bottom plate 11a, and the plate surfaces are spaced apart from each other in parallel with the plate surfaces of the left and right side plates 11b. The upper ends of the support plates 11d and 11d are in contact with the bottom surface of the upper plate 11c and support the upper plate 11c.

  The spindle base 13 has a substantially rectangular parallelepiped shape that is long in the front-rear direction, and is disposed in the rear part on the upper plate 11c. The spindle base 13 has two parallel support bases 13a and 13a that are long in the front-rear direction and supports guide rails 20a and 20a described later. The work bases 14 and 14 are arranged on the left and right of the front part on the upper plate 11c. Each of the work bases 14 and 14 includes a front support 14a and a rear support 14b. Each of the support bases 14a and 14b has a column shape, and the work support device 30 is seated on the upper surface and fixed.

  The Y-direction moving device 20 includes a pair of guide rails 20a, 20a parallel to each other, a plurality of blocks 20b, 20b,..., A Y-direction moving table 20c, and a Y-direction drive motor (not shown). The guide rails 20a, 20a extend in the front-rear direction on the upper surfaces of the support bases 13a, 13a of the spindle base 13. The blocks 20b, 20b,... Are fitted to the guide rails 20a, 20a so as to be movable in the front-rear direction. The Y-direction moving base 20c is fixed on the blocks 20b, 20b,. The Y-direction moving table 20c moves in the front-rear direction by driving the Y-direction drive motor.

  The X-direction moving device 21 includes a pair of guide rails 21a, 21a, a plurality of blocks 21b, 21b,..., A column base 21c, and an X-direction drive motor (not shown). The guide rails 21a, 21a extend in the left-right direction on the upper surface of the Y-direction moving table 20c with an appropriate interval in the front-rear direction. The blocks 21b, 21b,... Are fitted to the guide rails 21a, 21a so as to be movable in the left-right direction. The column base 21c is fixed on the blocks 21b, 21b,. The column base 21c is moved in the left-right direction by driving the X-direction drive motor.

  The column 22 has a columnar shape and is fixed on the column base 21c. The column 22 and the column base 21c are integrally formed. The column 22 is moved in the front-rear direction and the left-right direction by the Y-direction moving device 20 and the X-direction moving device 21.

  The Z-direction moving device 23 includes a pair of guide rails 23a, 23a parallel to each other, a plurality of blocks 23b, 23b,..., A spindle head base 23c, and a Z-direction drive motor (not shown). The guide rails 23a and 23a are extended in the vertical direction on the front surface of the column 22 with an appropriate interval in the horizontal direction. The blocks 23b, 23b,... Are fitted to the guide rails 23a, 23a so as to be movable in the vertical direction. The spindle head base 23c is fixed to the front side of the blocks 23b, 23b,. The spindle head base 23c is moved in the vertical direction by driving the Z direction drive motor.

  The spindle head 25 is fixed to the spindle head base 23c. By driving and controlling the X direction drive motor, the Y direction drive motor, and the Z direction drive motor, the spindle head 25 moves back and forth, left and right, and up and down.

  The spindle head 25 rotatably holds a spindle (not shown) extending in the vertical direction inside the front side. The main shaft detachably holds the tool 26 at the lower end. The spindle is connected to a spindle motor 25b provided at the upper end of the spindle head 25. The spindle motor 25b rotates the spindle around the axis, rotates the tool 26 attached to the lower end of the spindle, and can perform cutting on the workpiece fixed to the workpiece support device 30.

  FIG. 5 is a front perspective view of the workpiece support device 30, FIG. 6 is a rear perspective view of the workpiece support device 30, and FIG. 7 is a longitudinal front view of the workpiece support device 30. The work support device 30 includes a gear box 31, a bearing box 34, an A-axis motor 36, a rocking body 40, a rotary base 50, a C-axis drive unit 60, and the like.

  The gear box 31 includes a first housing portion 32 that houses a shaft portion 41 on the right side of the oscillator 40 described later, and a second housing portion 33 that is formed continuously with the first housing portion 32 and houses a roller gear cam 37. ing. The first accommodating portion 32 supports the shaft portion 41 so as to be rotatable around the X axis via the cross roller bearing 32a. In the following description, the central axis of the shaft portion 41 is expressed as an A axis. The A axis is an axis parallel to the X axis, and means a swing axis in the workpiece support device 30. The second accommodating portion 33 supports the roller gear cam 37 so as to be rotatable around the Y axis via a ball bearing or the like (not shown). The roller gear cam 37 has a shaft end connected to a rotor (not shown) of the A-axis motor 36, and a helical cam having an axis line as a central axis is formed immediately below the shaft portion 41. A plurality of cam followers 38 are equally arranged on the outer periphery of the shaft portion 41. The cam follower 38 meshes with the cam of the roller gear cam 37. The roller gear cam 37 is rotated about the Y axis by the rotor of the A-axis motor 36, the rotational force is transmitted from the spiral cam to the cam follower 38, and the shaft portion 41 rotates about the A axis. As the cam of the roller gear cam 37, a globoidal cam that does not generate backlash not only during stopping but also during rotation can be used. The gear box 31 has mounting seats 31a at the lower four corners, and is fixed to the right work base 14 by screws or the like.

  The bearing box 34 has a third accommodating portion 35 that accommodates a shaft portion 41 on the left side of the oscillator 40 described later. The third accommodating portion 35 supports the shaft portion 41 so as to be rotatable around the A axis via the angular bearing 35a. The bearing box 34 has mounting seats 34a at the front and rear of the lower part, and is fixed to the left work base 14 with screws or the like.

  The rocking body 40 includes left and right shaft portions 41 and 41, a substrate 42, and connecting portions 43 and 43. Each of the left and right shaft portions 41, 41 has a cylindrical shape, the right shaft portion 41 is supported by the gear box 31 so as to be rotatable around the A axis, and the left shaft portion 41 is rotatable by the bearing box 34 around the A axis. It is supported by. The shaft portions 41 and 41 are arranged so as to be coaxial with each other. The substrate 42 has a substantially rectangular shape in plan view, and is arranged so as to be separated from the end portions of the shaft portions 41 and 41 in the axial direction. The connecting portions 43, 43 connect the left and right shaft portions 41, 41 and the substrate 42. The substrate 42 is provided with a turntable 50 on the upper side and a C-axis drive unit 60 on the lower side. The details of the oscillator 40 will be described later.

  The C-axis drive unit 60 includes a housing 61, a rotary shaft 80, an encoder 81, and the like. The housing 61 includes a body portion 62, a bottom plate 63, a bearing holder 64, an upper plate 65, and the like, and has a bottomed cylindrical shape. The body portion 62 has a cylindrical shape, heat radiation fins are formed on the outer periphery, and a stator is fixed on the inner periphery. A bottom plate 63 is fixed to the lower surface of the body portion 62, and an upper plate 65 is fixed to the upper surface via a bearing holder 64. The bottom plate 63 has an annular shape, has a bearing fitted on the inner peripheral surface, and is fixed to the body portion 62 at the outer peripheral edge. The bearing holder 64 is formed with an annular flange outwardly at the lower end of a cylindrical portion into which the bearing is inserted. The bearing is fitted into the bearing holder 64 and the bottom plate 63, and the rotating shaft 80 is inserted into the bearing, thereby supporting the rotating shaft 80 so as to be rotatable around the C axis. The rotating shaft 80 has a cylindrical shape, and a rotor that is paired with the stator is fixed to the outer periphery. Here, the C-axis means the axial direction of the rotating shaft 80. In general, the C-axis means an axis parallel to the Z-axis, but in the present invention, since the oscillating body 40 oscillates, the C-axis direction is treated as being changed by the oscillation. The turntable 50 is fixed to the upper end surface of the rotation shaft 80 and rotates around the C axis together with the rotation shaft 80.

  The upper plate 65 has a substantially annular shape, and an annular convex portion that fits into an annular V groove formed on the lower end surface of the turntable 50 is formed on the upper surface. The upper plate 65 is fixed to the upper portion of the body portion 62 at the peripheral portion together with the bearing holder. The annular convex portion formed on the upper plate 65 is fitted into the annular V groove of the turntable 50 to form a seal portion.

  The encoder 81 is attached to the lower end portion of the rotation shaft 80 and detects the rotation angle of the rotation shaft 80. A power supply line 82 to the motor and a signal line 83 to the encoder 81 are connected to the lower portion of the housing 61 of the C-axis drive unit 60. The power supply line 82 and the signal line 83 are pulled upward from the lower portion of the housing 61 of the C-axis drive unit 60, passed through the connecting portion 43 of the oscillator 40, and inserted into the cylinder of the left shaft portion 41. It is arranged so as to be pulled out from the left end of the.

  8 is a front perspective view of the oscillating body 40, FIG. 9 is a rear perspective view of the oscillating body 40, FIG. 10 is a top view of the oscillating body 40, FIG. 11 is a bottom view of the oscillating body 40, and FIG. It is sectional drawing by an AA line. In addition, in FIGS. 8-12, the axial parts 41 and 41 are abbreviate | omitted. As described above, the oscillating body 40 includes the left and right shaft portions 41 and 41, the substrate 42, and the connecting portions 43 and 43. The substrate 42 faces the end portions of the shaft portions 41 and 41 (the center between the shaft portions 41 and 41 faces). The connecting portions 43, 43 connect the left and right shaft portions 41, 41 and the substrate 42.

  The substrate 42 has a substantially rectangular shape in plan view, and a hole 42a having a diameter slightly smaller than the dimension of the side of the outer shape is formed in the center. The C-axis drive unit 60 to which the turntable 50 is attached is inserted into the central hole 42a of the substrate 42 from below, and is seated on the seating surfaces 42c provided at the four corners of the bottom surface of the substrate 42 and fixed by screws or the like. The substrate 42 is formed such that the vertical heights of the front and rear edge portions 42b, 42b increase upward from the center toward the left and right outer sides.

  The connection parts 43 and 43 are each provided with a flange 43a, beams 43b and 43b, and the like. Since the left and right connecting portions 43 and 43 have substantially the same configuration, in the following description, one connecting portion 43 will be described for the sake of brevity. The flange 43a has an annular shape, and a hole penetrating in the X-axis direction is formed at the center. The peripheral surface of the hole is flush with the inner peripheral surface of the shaft portion 41, and includes a through-hole arranged equally at the edge of the hole. The shaft portion 41 is screwed into the through hole, screwed into a screw hole provided in the end surface of the shaft portion 41, and fixed to the flange 43a.

  One end of each of the beams 43b and 43b is fixed to the front and rear sides of the peripheral edge of the flange 43a, and the other end is connected to the front and rear edges 42b and 42b of the substrate 42. In other words, it can be said that the other ends of the beams 43 b and 43 b are connected to positions separated in the circumferential direction of the substrate 42. The distance between the beams 43b and 43b in the front-rear direction is wider on the substrate 42 side than on the shaft portion 41 side. The beams 43b and 43b are wider in the vertical direction on the flange 43a side (on the end portion side of the shaft portion 41) than on the substrate 42 side, and the rigidity of the beam against the load in the vertical direction is increased. Further, the rigidity of the beams 43b and 43b is increased by making the width in the direction perpendicular to the central axis and the vertical direction (T direction in FIG. 10) closer to the flange 43a side (end side of the shaft portion 41) than the substrate 42 side. It can also be increased.

  The beams 43b and 43b have plate-like flange portions 43c and 43c that are bent inward from the upper edge and face each other. The cross section orthogonal to the central axis of the beams 43b and 43b is substantially L-shaped including the flanges 43c and 43c (see FIG. 12). The opposite edge portions of the flange portions 43c, 43c are inclined upward from the substrate 42 side toward the flange 43a side. In addition, the board | substrate 42 and the connection parts 43 and 43 can be integrally molded by casting.

  The substrate 42 is disposed at a position slightly offset to the right side from the center between the end surfaces on the shaft portions 41, 41 side of the flanges 43a, 43a (see FIGS. 10 and 11), and is fixed to the substrate 42. Similarly, the drive unit 60 and the turntable 50 are arranged at positions shifted to the right side. The gear box 31 arranged on the right side supports the shaft part 41 via the cross roller bearing 32a, and the support rigidity of the shaft part 41 is higher than that of the left side bearing box 35 that supports the shaft part 41 by the angular bearing 35a. high. By placing the C-axis drive unit 60 and the turntable 50 close to the gear box 31 having high support rigidity, deformation due to the weight of the C-axis drive unit 60 and the turntable 50 and the load applied to the turntable 50 is reduced. It is.

  The oscillating body 40 has through holes 44 and 44 having peripheral surfaces on the left and right outer peripheral surfaces of the substrate 42, inner surfaces facing the beams 43b and 43b, and an end surface of the flange 43a on the substrate 42 side. The through holes 44, 44 penetrate from the upper side to the lower side of the substrate 42. Considering that the turntable 50 is disposed on one side (upper side) of the substrate 42 and the C-axis drive unit 60 is disposed on the other side (lower side), the through holes 44 and 44 are formed on the substrate 42. 42 can be said to penetrate from one surface side to the other surface side. One end of each of the shaft portions 41 and 41 faces the through holes 44 and 44, and the inside of the cylinder of the shaft portions 41 and 41 communicates with the through holes 44 and 44.

  The work support device 30 includes connecting portion covers 51 and 52 and a central cover 53 on the upper side of the rocking body 40 and a wiring cover 54 and the like on the lower side. Each of the connecting portion covers 51 and 52 has a trapezoidal shape in plan view, covers from the flange 43a to the edge of the substrate 42 along the flange portions 43c and 43c, and is detachably attached to the upper edge of the connecting portion 43 with screws or the like. is there. The center cover 53 has a rectangular shape in plan view, has a hole through which the turntable 50 is inserted, and covers the upper portion of the substrate 42 (see FIGS. 5, 6, and 7). The connecting portion cover 52 that covers the right connecting portion 43 has a recessed portion 52a that is recessed downward along the edges of the flange portions 43c and 43c. The recess 52a faces the top of the turntable 50, and the bottom is inserted into the through hole 44. As described above, since the turntable 50 is disposed close to the gear box 31, the bottom edge of the work placed on the turntable 50 is likely to mechanically interfere with the connecting portion cover 52. Since the connection part cover 52 has the recessed part 52a, the space which arrange | positions a workpiece | work spreads. Similarly, a recess may be formed in the connecting portion cover 51.

  The wiring cover 54 covers the power supply line 82 and the signal line 83 connected to the lower portion of the housing 61 of the C-axis drive unit 60 from below, and is detachably attached to the bottom surface of the left connection unit 42 with screws or the like.

  In the work support device 30, the rocking body 40 is swung and the turntable 50 is rotated by a control signal supplied from the control device (not shown) to the A-axis motor 36 and the C-axis drive unit 60. The control signal to the A-axis motor 36 rotates the rotor of the A-axis motor 36, and the roller gear cam 37 connected to the rotor rotates about the Y axis. A rotational force is transmitted from the helical cam of the roller gear cam 37 to the cam follower 38, and the shaft portion 41 in the gear box 31 rotates about the A axis. As the shaft portion 41 rotates, the work supported by the rocking body 40 and the turntable 50 rocks. Assuming that the normal direction of the work placement surface of the turntable 50 faces upward (for example, the state shown in FIG. 5) is 0 degrees, the shaft portion 41 is in the range from +90 degrees to −90 degrees around the A axis. Thus, the workpiece can be rotated to an arbitrary angle and stopped, and the workpiece surface facing the tool 26 can be cut.

  The rotary shaft 80 of the C-axis drive unit 60 is rotated by a control signal to the C-axis drive unit 60, and the rotary table 50 connected to the rotary shaft 80 and the work supported by the rotary table 50 rotate around the C axis. To do. If there is no mechanical interference, the workpiece can be set at an arbitrary angle around the C axis. Combining the rotation around the C axis and the rocking motion by the rocking body 40, the cutting of the workpiece surface with the arbitrary direction on the hemisphere having the normal direction of the mounting surface of the turntable 50 as the zenith direction and the normal direction. Is possible. Furthermore, turning can be performed by rotating the workpiece at a high speed by the C-axis drive unit 60 and pressing the tool 26 against the workpiece and sending it.

  Further, the wiring work of the power supply line 82 and the signal line 83 is performed by removing the connecting portion cover 51 and the wiring cover 54 from the oscillator 40. The power supply line 82 and the signal line 83 connected to the lower part of the housing 61 of the C-axis drive part 60 are inserted into the through hole 44 of the left connecting part 43 from below, and the hand is extended from above the connecting part 43 to supply power. While lifting the supply line 82 and the signal line 83, the power supply line 82 and the signal line 83 are inserted into the left shaft portion 41 and pulled out to the left. On the contrary, the power supply line 82 and the signal line 83 are inserted into the shaft part 41 from the left side of the left shaft part 41, and the power supply line 82 and the signal are extended from the upper part of the connecting part 43 to the through hole 44. The operation may be performed so that the power supply line 82 and the signal line 83 are connected to the lower portion of the housing 61 of the C-axis driving unit 60 while the line 83 is pulled out from the shaft portion 41 and dropped.

  After the power supply line 82 and the signal line 83 are wired, the connecting portion cover 51 and the wiring cover 54 are attached to the rocking body 40 to cover the through hole 44, and cutting chips and coolant are prevented from entering the through hole 44. Further, similarly to the wiring of the power supply line 82 and the signal line 83, an air supply pipe and a coolant supply pipe (not shown) may be connected to the left and right through holes 44 and the shaft portion 41.

  Further, by removing the connecting portion covers 51 and 52 and the wiring cover 54, the visibility and accessibility to the lower side of the rocking body 40 are improved. For example, when performing maintenance work, each cover is removed from the rocking body 40, and there is no foreign matter (for example, a work piece, accumulation of cutting waste, etc.) on the upper plate 11c of the base 11 below the rocking body 40, and power is supplied. It can be visually confirmed whether the line 82 and the signal line 83 are abnormal.

  As described above, according to the present embodiment, the work support device 30 includes the turntable 50 by the C-axis drive unit 60 that is attached to the swinging body 40 that is swingably supported by the gear box 31 and the bearing box 34. And the work is placed on and supported by the turntable 50. The rocking body 40 includes shaft portions 41 and 41, a substrate 42, connecting portions 43 and 43, and the like. The shaft portions 41, 41 are swingably supported by the gear box 31 and the bearing box 34, and the substrate 42 is arranged apart from one end of each of the shaft portions 41, 41 in the axial direction. A turntable 50 is disposed on the upper side, which is the one surface side, and a C-axis drive unit 60 is disposed on the lower side, which is the other surface side. Each of the connecting portions 43, 43 connects one end of the shaft portion 41 and the substrate 42, and is provided with a through hole 44 penetrating from the one surface side to the other surface side. Access from one side to the other is improved.

  Moreover, according to this embodiment, the connection parts 43 and 43 each have two beams 43b and 43b. Since the beams 43b and 43b are arranged so that the distance on the substrate 42 side is wider than the distance on the one end portion side of the shaft portion 41, a truss structure is formed by the beams 43b and 43b and the peripheral edge portion of the substrate 42. Moreover, a comparatively large through-hole can be provided between the beams 43b and 43b, and the accessibility from the one surface side of the substrate 42 to the other surface side becomes good.

  Moreover, according to this embodiment, the rigidity of the connection parts 43 and 43 increases because each beam 43b and 43b has the one end part side of the axial part 41 wider than the board | substrate 42 side. Moreover, the rigidity of the beams 43b and 43b can be improved by providing the flanges 43c on the beams 43b and 43b, respectively, and making the cross-sectional shape orthogonal to the central axis of the beams substantially L-shaped.

  Further, according to the present embodiment, the shaft portion 41 has a cylindrical shape, one end side faces the through hole 44, and the through hole 44 communicates with the inside of the cylinder of the shaft portion 41. A power supply line 82 that supplies power to the C-axis drive unit 60 and a signal line 83 to the encoder 81 are inserted into the shaft unit 41. When the oscillating body 40 is oscillated, the power supply line 82 and the signal line 83 can be deformed so as to be twisted on the axis of the shaft portion 41, and the load when the oscillating body 40 is oscillated is suppressed. . Further, since the power supply line 82 and the signal line 83 can be accessed through the through hole 44 from above, which is one surface side of the substrate 42, the operation of inserting the power supply line 82 and the signal line 83 into the shaft portion 41, and further the power supply line The workability in the work of attaching and detaching 82 and the signal line 83 to and from the C-axis drive unit 60 is good.

  Further, according to the present embodiment, the connecting part covers 51 and 52 are detachably attached to the connecting parts 43 and 43 and cover the through holes 44 and 44. The connection portion covers 51 and 52 can prevent cutting waste and coolant from entering the through holes 44 and 44. Further, by removing each cover, the accessibility from the upper side, which is the one surface side of the substrate 42, to the lower side, which is the other surface side, is improved.

  Further, according to the present embodiment, the connecting portion cover 52 has the concave portion 52 a facing upward, which is one surface side of the substrate 42, and the bottom portion of the concave portion 52 a is fitted into the through hole 44. The cover attached to the connecting portion 43 shields the through-hole 44 and at the same time partitions the space on the one surface side of the substrate 42 on which the turntable 50 is disposed, that is, the space on which the workpiece is placed. Since the connection part cover 52 has the recessed part 52a which faces the one surface side of a board | substrate, the space where a workpiece | work is mounted can be made wider.

  Further, according to the present embodiment, the workpiece supported by the workpiece support device 30 can be cut by the spindle head 25 on which the tool 26 is mounted. Further, the workpiece can be turned by rotating the workpiece by the C-axis drive unit 60.

(Modification)
FIG. 13 is a top view of an oscillating body 40 according to a modified example, and FIG. 14 is a front view of the oscillating body 40 according to the modified example. The swinging body 40 shown in FIGS. 13 and 14 is an example in which the connecting portions 43 and 43 are changed. In addition, in FIG.13 and FIG.14, the axial parts 41 and 41 are abbreviate | omitted. In the connecting portion 43 according to the modification, the width in the front-rear direction of the flange 43a is expanded to the width in the front-rear direction of the substrate 42, and the beams 43b and 43b are formed in parallel to the X-axis direction.

  The beams 43b and 43b are wider in the vertical direction on the flange 43a side (on the end portion side of the shaft portion 41) than on the substrate 42 side, and the rigidity of the beam against the load in the vertical direction is increased. Further, the rigidity of the beams 43b and 43b can be increased by making the width in the direction perpendicular to the central axis and the vertical direction on the flange 43a side (the end side of the shaft portion 41) wider than the substrate 42 side.

  The beams 43b and 43b have plate-like flange portions 43c and 43c that are bent inward from the upper edge and face each other. The cross section orthogonal to the central axis of the beams 43b and 43b is substantially L-shaped including the flanges 43c and 43c. The opposite peripheral edges of the flange portions 43c and 43c are inclined upward from the substrate 42 side toward the flange 43a side. In addition, the board | substrate 42 and the connection parts 43 and 43 can be integrally molded by casting.

  The oscillating body 40 according to the modified example also includes through holes 44 and 44 having an outer peripheral surface of the substrate 42, inner surfaces facing the beams 43b and 43b, and an end surface of the flange 43a on the substrate 42 side as peripheral surfaces. The accessibility of the moving body 40 from one side of the substrate 42 to the other side is good, and the swinging body 40 having the shape shown in FIG.

  The embodiment described above is an exemplification of the present invention, and the present invention can be implemented in various modified forms within the scope defined by the matters described in the claims and the description of the claims. it can.

100 machine tools 25 spindle head (machining spindle device)
30 Work support device (Workpiece support device)
31 Gear box (support)
34 Bearing box (support)
40 Oscillator 41 Shaft part 42 Substrate 43 Connection part 43b Beam (beam member)
44 Through hole 50 Turntable 51, 52 Connection part cover (cover)
52a Recessed portion 60 C-axis drive unit (rotation drive unit)
82 Power supply line

Claims (9)

In a workpiece support device for rotating a rotating table by a rotation driving unit attached to an oscillating member supported so as to be swingable by the supporting member, and placing and supporting the workpiece on the rotating table,
The oscillating body includes a shaft portion that is swingably supported by the support body, and is spaced apart in an axial direction from one end portion of the shaft portion. Is provided on the other surface side, and has a connecting portion that connects the one end portion and the substrate and has a through hole penetrating from the one surface side to the other surface side. Workpiece support device. The connecting portion has two beam members,
2. The workpiece support device according to claim 1, wherein the two beam members are arranged so that a distance on the substrate side is wider than a distance on the one end portion side.   The workpiece support device according to claim 2, wherein each of the two beam members is wider at the one end side than at the substrate side.   The workpiece support device according to claim 2, wherein each of the two beam members has a substantially L-shaped cross section. The shaft portion has a cylindrical shape, and one end side faces the through hole,
5. The workpiece support device according to claim 1, wherein a power supply line for supplying power to the rotation driving unit is inserted into the shaft portion. 6.   The workpiece support device according to any one of claims 1 to 5, further comprising a cover that is detachably attached to the connecting portion and covers the through hole.   The work support apparatus according to claim 6, wherein the cover has a concave portion facing the one surface side, and a bottom portion of the concave portion is fitted into the through hole.   A machine tool comprising: the workpiece support device according to claim 1; and a machining spindle device for machining a workpiece supported by the workpiece support device.   The machine tool according to claim 8, wherein the workpiece is rotated by the rotation driving unit, and the workpiece is turned.

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