JP2006175559A - Lathe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lathe which allows the operator to carry out machining with good workability, can realize flexible layout, and achieves machining with high accuracy. <P>SOLUTION: The lathe 1 is formed of a head 10, a main spindle 12 holding one end of a workpiece W, a headstock 11 holding the main spindle 12 so as to horizontally maintain its axis and so as to be rotatable about the axis, and arranged on the head 10 in a manner being movable along the axis of the main spindle 12, a rotation driving mechanism for rotating the main spindle 12 about its axis, a tailstock 14 fixed onto the head 10 and opposed to the headstock 11, a tailstock spindle 15 supported by the tailstock 14 so as to be coaxial with the axis of the main spindle 12, and supporting the other end of the workpiece W, tool posts 20, 30 arranged on the head 10 so as to be movable in an axial direction of the main spindle 12 and a direction orthogonal to the axial direction, and supporting a tool T, and a feeding mechanism for moving the headstock 11 and the tool posts 20, 30 in the respective directions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a spindle that holds one end of a workpiece, a spindle that rotatably supports the spindle, and a tailstock that is disposed to face the spindle and supports the other end of the workpiece. And a lathe provided with a tool post for holding a tool.

  As the lathe, conventionally, for example, one disclosed in Japanese Patent Laid-Open No. 5-200601 is known. As shown in FIGS. 5 and 6, the lathe 100 includes a bed 101 whose front surface is inclined, and a bed. 101, a headstock 102 fixed on the inclined surface of the front surface of the 101, a main shaft 103 rotatably supported about the axis line by the headstock 102, and the axial direction of the main shaft 103 (an arrow direction in FIG. 5) on the inclined surface of the front surface of the bed 101 ), A tailstock 105 supported movably in the axial direction by the tailstock 105, and an inclined surface on the front surface of the bed 101 movably in the axial direction of the main shaft 103. A first saddle 107 and a second saddle 107 are disposed on the saddle 107 so as to be movable in a direction orthogonal to the axis of the main shaft 103 (indicated by an arrow in FIG. 6) and hold the tool T. And it is configured from, such as the tool rest 108 and 109. FIG. 5 is a front view showing a schematic configuration of a lathe according to a conventional example, and FIG. 6 is a side view of the lathe shown in FIG.

  The spindle 103 includes a chuck 104 that holds one end side of the workpiece W, the axis is horizontally arranged, and is rotated around the axis by a rotation drive mechanism (not shown) built in the spindle stock 102. . Further, the tailstock shaft 106 is arranged coaxially with the main shaft 103 axis and supports the other end side of the workpiece W, and the axis line is provided by a hydraulic mechanism (not shown) provided on the tailstock 105. It can be moved in the direction.

  The tailstock 105 and the saddle 107 can be moved in the axial direction of the main shaft 103 by the feed mechanisms 110 and 111 having drive motors 110a and 111a, ball screws 110b and 111b, and the like. Similarly, the base 108 and the second tool rest 109 can be moved in the direction orthogonal to the axis of the main shaft 103 by the feed mechanisms 112 and 113 including drive motors 112a and 113a and a ball screw (not shown). It has become.

  According to the lathe 100 configured in this manner, first, the spindle 103 of the spindle stock 102 is held on one end side of the workpiece W, and then the tailstock 105 is moved in the axial direction of the spindle 103 by the feed mechanism 110. The tailstock shaft 106 of the tailstock 105 is brought into contact with the other end side of the workpiece W. Next, a hydraulic mechanism (not shown) is operated to move the tailstock shaft 106 to the main shaft 103 side. However, since the tailstock shaft 106 cannot move to the main shaft 103 side, a predetermined amount is placed on the other end side of the workpiece W. Thus, the other end side of the workpiece W is supported by the tailstock shaft 106.

  Then, the main shaft 103 is rotated about the axis line by a rotation drive mechanism (not shown) to rotate the workpiece W, and the first turret 108 and the second turret 109 are fed by the feed mechanisms 111, 112, 113 to a predetermined feed rate. When moved in the direction, the workpiece W is machined into a predetermined shape.

JP-A-5-200601

  However, in the conventional lathe 100, when an operator performs various operations such as attachment / detachment of the workpiece W, for example, the operator can perform the operation only from the front side of the bed 101. There is a problem that the layout of the lathe 100 is limited.

  Further, when maintenance is performed, since it is necessary to perform this for all structures such as the headstock 102, the tailstock 105, the saddle 107, the first tool post 108, and the second tool post 109, the work area is large. There is also a problem that it is not efficient.

  Further, the headstock 102 and the tailstock 105 are more complicated in structure than the tailstock 102 compared to the tailstock 105, and the tailstock 105 is configured to be movable. Since the pedestal 102 is fixed to the bed, the tailstock 105 is less rigid than the headstock 102. Therefore, the tailstock 106 has a predetermined force on the other end side of the workpiece W. There is also a problem in that the processing accuracy of the workpiece W is lowered because the axis of the tailstock 106 is inclined or the tailstock 105 is distorted.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lathe that has good workability for workers, enables a flexible layout, and can perform high-precision machining. To do.

To achieve the above object, the present invention provides:
A bed, a spindle stock disposed on the bed, a spindle supported by the spindle stock so that the axis is horizontal and rotatable about the axis, and holding one end of a workpiece; and the spindle A rotation drive mechanism that rotates the axis around the axis, a tailstock disposed on the bed facing the spindle, and supported by the tailstock so as to be coaxial with the axis of the spindle, A tailstock that supports the other end side of the workpiece, a tool rest that is disposed on the bed so as to be movable in the main shaft axis direction and a direction orthogonal thereto, and that holds the tool. A lathe equipped with a tool post feed mechanism for moving in a direction,
The spindle stock is configured to be movable in the spindle axial direction, while the tailstock is fixed to the bed,
The spindle stock is related to a lathe characterized in that the spindle stock is configured to be moved in the spindle axis direction by a spindle feed mechanism.

  According to this invention, for example, first, the other end side of the work is pressed against the tailstock of the tailstock, and then the headstock is moved in the direction of the spindle axis by the spindle feed mechanism. By holding the workpiece, the workpiece is held in a state of being sandwiched between the spindle and the tailstock. Thereafter, when the workpiece is rotated by rotating the main shaft about the axis by the rotation driving mechanism, and the tool rest is moved in a predetermined feeding direction by the tool rest feeding mechanism, the work is processed into a predetermined shape.

  In the present invention, since a tailstock having a simple structure and a shape that is not so large as that of the headstock is fixed to the bed, an operator can perform various operations such as attaching and detaching a workpiece. In addition, it is possible to work from the tailstock side, so that the workability can be improved, and the layout can be flexibly performed by minimizing restrictions imposed on the lathe layout.

  Also, when performing lathe maintenance, since the tailstock is fixed to the bed, maintenance on the tailstock portion can be omitted, thereby reducing the maintenance area efficiently. Can be maintained.

  In addition, since the tailstock having low rigidity compared to the headstock is fixed to the bed and the headstock is moved, the rigidity of the tailstock can be increased, and the other end side of the work can be It is possible to effectively prevent the axis of the tailstock from being tilted or the tailstock from being distorted by the force when pressed against the tailstock, and the workpiece can be machined with high accuracy.

  The bed is formed in a rectangular shape in a top view, and at least the outer shape of the vertical cross section in the bed width direction is symmetrical with respect to a predetermined vertical symmetry plane, and the headstock and the tailstock May be arranged on the upper surface of the bed so that the axes of the main shaft and the tailstock are included in the symmetry plane.

  In this way, the outer shape of the lathe can be made compact by equalizing the distance from each side surface on both sides in the bed width direction to the central portion (the symmetrical surface), that is, the axis of the main shaft and the tailstock. Therefore, the operator can perform various operations in the same manner from both sides in the bed width direction. As a result, the workability of the operator can be further improved, and the layout of the lathe in the factory can be performed more flexibly.

  The lathe further includes chip recovery means for recovering chips, and the bed is formed in a vertical direction with an opening in an upper surface between the headstock and the tailstock. A discharge hole, and four insertion ports formed in a horizontal direction, one side communicating with a lower portion of the chip discharge hole and the other side opening on each side surface, and the chip collecting means includes: It may be inserted from one and disposed below the chip discharge hole.

  In this way, chips generated during the processing of the workpiece fall downward from the chip discharge hole and fall onto the chip collecting means inserted from the insertion port and are recovered. Is formed on each of the side surfaces of the bed 4, the insertion port for inserting the chip discharging means can be changed as appropriate according to the layout of the lathe, and the lathe can be laid out more flexibly. .

  The lathe further includes a head body, a tailstock, a tool rest, and a cover body that surrounds at least the upper surface of the bed, and the cover body includes a door for forming an opening on the upper surface. In this way, the cover body can prevent chips and cutting fluid from splashing to the outside, and the operator can open various types of doors from the opening on the top surface of the cover body. Work can be done. In this case, it is necessary to set the height of the upper surface of the bed low to reduce the height of the entire lathe.

  Further, the opening of the cover body is formed from the upper side of the tailstock to the opposite side so that the distances from the opening end faces on both sides of the bed width direction to the symmetry plane are equal to each other. In this way, the operator can easily perform the work through the opening from either side of the bed width direction on either side or the bed side on the tailstock side. Can proceed.

  Thus, according to the lathe according to the present invention, the workability of the operator can be improved, the layout can be made flexibly, and the machining accuracy of the workpiece can be further increased.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a perspective view showing a schematic configuration of a lathe according to an embodiment of the present invention, FIG. 2 is a plan view of the lathe shown in FIG. 1, and FIG. 3 is shown in FIG. 4 is a front view of the lathe, and FIG. 4 is a cross-sectional view in the direction of arrows AA in FIG.

  As shown in FIGS. 1 to 4, a lathe 1 of this example includes a bed 10 formed in a rectangular shape, a main shaft 12 whose axis is parallel to the longitudinal direction of the bed 10, and a main shaft 12. A headstock 11 that is rotatably supported at the center and is disposed on the upper surface of the bed 10 so as to be movable in the axial direction (Z-axis direction) of the spindle 12, and a longitudinal end portion of the bed 10 that faces the headstock 11 A tailstock 14 fixed on the upper surface, a tailstock 15 supported coaxially with the spindle 12 axis by the tailstock 14, and a spindle 12 axial direction (Z-axis direction) on the upper surface on both sides in the width direction of the bed 10 The first and second tool rests 20 and 30 are arranged so as to be movable in the directions (X1-axis and X2-axis directions) orthogonal thereto.

  The lathe 1 includes a moving mechanism 40 that moves the headstock 11, the first tool post 20, and the second tool post 30 in the respective directions, and a recovery device 60 that recovers chips generated by the cutting process. , The headstock 11, the tailstock 14, the first tool post 20, the second tool post 30, the cover body 16 surrounding the upper surface of the bed 10, and a control device (not shown) for controlling the operation of the moving mechanism 40 and the recovery device 60. ).

  The bed 10 is formed so that the outer shape of the vertical cross section in the width direction is symmetrical with respect to a predetermined vertical symmetry plane M, and recesses 10a are formed on the upper surfaces of the end portions on both sides in the width direction along the Z-axis direction. The headstock 11 and the tailstock 14 are arranged on the upper surface of the central portion in the width direction of the bed 10 so that the axes of the spindle 12 and the tailstock 15 are included in the symmetry plane M.

  In addition, the bed 10 opens in the upper surface between the headstock 11 and the tailstock 14 (that is, the upper surface of the central portion of the bed 11) and is formed in a long hole shape whose longitudinal direction is along the axial direction of the main shaft 12. , A chip discharge hole 10b penetrating in the vertical direction, and four insertion ports 10c formed in the horizontal direction, one side communicating with the lower part of the chip discharge hole 10b and the other side opened on four side surfaces, respectively. Yes. In addition, each insertion opening 10c opened on the side surface on both sides in the longitudinal direction of the bed 10 is formed on the same straight line parallel to the longitudinal direction of the bed 10, and each insertion opening opened on the side surface on both sides in the width direction of the bed 10 Similarly, 10 c is formed on the same straight line parallel to the width direction of the bed 10.

  The spindle stock 11 is controlled in its operation by a control device (not shown), and has a built-in rotation drive device (not shown) for rotating the spindle 12 about its axis. A chuck 13 for holding one end side of W is mounted. The other end side of the workpiece W is supported by a tailstock 15.

  The first tool post 20 is disposed on the upper surface of the bed 10 between the side surface on one side in the width direction of the bed 10 and the chip discharge hole 10b so as to be movable in the Z-axis direction, and the upper surface is on the chip discharge hole 10b side. A first saddle 21 which is inclined in parallel to the X1 axis direction, a second saddle 22 which is disposed on the upper surface of the first saddle 21 so as to be movable in the X1 axis direction, and a second saddle 22. A tool post body 23, a polygonal column turret 24 which is supported by the tool post body 23 so as to be rotatable about a rotation center axis parallel to the main axis 12 axis, and a plurality of tools T are mounted on the outer peripheral surface; And an indexing mechanism 25 that rotates the turret 24 about the rotation center axis and indexes a predetermined tool T to a predetermined processing position.

  The second tool post 30 includes a first saddle 31, a second saddle 32, a tool post body 33, a turret 34, and an indexing mechanism 35, similar to the first tool post 20, but the first saddle 31. Is disposed on the upper surface of the bed 10 between the other side surface in the width direction of the bed 10 and the chip discharge hole 10b so as to be movable in the Z-axis direction, and the upper surface is parallel to the chip discharge hole 10b side in the X2-axis direction. The second saddle 32 is disposed on the upper surface of the first saddle 31 so as to be movable in the X2 axis direction.

  The moving mechanism 40 includes a first guide device 41 that guides the movement of the head stock 11, a second guide device 42 that guides the movement of the first saddle 21 of the first tool post 20, and the first guide device 20 of the first tool post 20. The third guide device 43 that guides the movement of the two saddles 22, the fourth guide device 44 that guides the movement of the first saddle 31 of the second tool post 30, and the movement of the second saddle 32 of the second tool post 30. A fifth guiding device 45 for guiding, a first feeding device 46 for driving the headstock 11, a second feeding device 47 for driving the first saddle 21 of the first tool rest 20, and a second of the first tool rest 20. A third feed device 48 that drives the saddle 22, a fourth feed device 49 that drives the first saddle 31 of the second tool post 30, and a fifth feed device 50 that drives the second saddle 32 of the second tool post 30. With.

  The first guide device 41 is fixed to the upper surface of the bed 10 on both sides of the chip discharge hole 10b along the Z axis, and is fixed to the bottom surface of the headstock 11. The first guide device 41 is movable to the guide rail 41a. The slider 41b is engaged with the slider 41b.

  The second guide device 42 and the fourth guide device 44 are fixed to the guide rails 42a and 44a disposed along the Z axis on the upper surface of the bed 10 on both sides of the recess 10a and the bottom surfaces of the first saddles 21 and 31, respectively. The third guide device 43 and the fifth guide device 45 are arranged on the upper surface of the first saddles 21 and 31 with the X1 axis or the sliders 42b and 44b movably engaged with the guide rails 42a and 44a. Guide rails 43a and 45a disposed along the X2 axis and sliders 43b and 45b fixed to the bottom surfaces of the second saddles 22 and 32 and movably engaged with the guide rails 43a and 45a.

  The first feeding device 46 is disposed along the Z axis so as to cross a drive motor 46a fixed to the bed 10 and a recess 10d formed on the upper surface of the bed 10 below the headstock 11, and the drive motor 46a. And a nut 46c fixed to the bottom surface of the headstock 11 and disposed in the recess 10d and screwed with the ball screw 46b.

  The second feeding device 47 and the fourth feeding device 49 are disposed along the Z axis in the recess 10a and drive motors 47a and 49a accommodated in the recess 10a at the end in the width direction of the bed 10. The ball screws 47b and 49b are rotated about the axis by the drive motors 47a and 49a, and are fixed to the bottom surfaces of the first saddles 21 and 31 and disposed in the recess 10a, and screwed with the ball screws 47b and 49b. The third feeding device 48 and the fifth feeding device 50 include nuts 47c and 49c. The third feeding device 48 and the fifth feeding device 50 include a drive motor 48a and 50a fixed to the upper surface of the first saddle 21 and an X1 axis or upper surface of the first saddle 21 and 31. Ball screws 48b and 50b disposed along the X2 axis and rotated about the axis by drive motors 48a and 50a, and attached to the side surfaces of the first saddles 21 and 31, Ball screw 48b, 50b and screwed with the nut 48c, consisting of 50c.

  Thus, in each of these guide devices 41, 42, 43, 44, 45 and each of the feeding devices 46, 47, 48, 49, 50, the drive motors 46a, 47a, 48a, 49a, 50a are driven and the ball screws are driven. 46b, 47b, 48b, 49b, and 50b rotate about the axis, and the nuts 46c, 47c, 48c, 49c, and 50c move along this, so that the guide rails 41a, 42a, 43a, 44a, and 45a and the slider 41b are moved. , 42b, 43b, 44b, 45b, the headstock 11 and the first saddles 21, 31 move in the Z-axis direction, and the second saddles 22, 32 move in the X1-axis or X2-axis direction. The operation of the drive motors 46a, 47a, 48a, 49a, 50a of the feeding devices 46, 47, 48, 49, 50 is controlled by a control device (not shown).

  The collection device 60 includes a discharge mechanism 61 that conveys chips in a predetermined conveyance direction and discharges the chips outside the machine, and a storage tank 64 that is disposed below the discharge mechanism 61 on the upstream side in the conveyance direction and stores cutting fluid. And a collection box 65 disposed below the discharge mechanism 61 at the downstream end in the transport direction.

  The discharge mechanism 61 is configured by connecting a plurality of plates 62a in an endless ring shape, and includes a conveyance belt 62 that conveys chips, a support member 63 that accommodates and rotatably supports the conveyance belt 62, and a control device. The operation is controlled by (not shown), and includes a drive motor (not shown) that rotates the conveyor belt 62 in the direction of the arrow (see FIG. 3).

  The support member 63 includes a horizontal portion 63a and an inclined portion 63c. The horizontal portion 63a has a distal end portion (an end portion on the upstream side in the transport direction) of the four insertion ports 10c, and the length of the bed 10 is long. It is inserted from the insertion port 10c opened on the side surface of the end portion on the side of the head stock 11 in the direction and is disposed below the chip discharge hole 10b, and the inclined portion 63c is disposed outside the lathe 1.

  Further, the horizontal portion 63a is formed with an opening at the top and bottom, and chips and cutting fluid fall on the conveying belt 62 from the opening 63b, and the cutting fluid dropped on the conveying belt 62 is: It flows further downward (in the storage tank 64 as will be described later) from the opening 63b. The inclined portion 63c has an open lower surface on the downstream end side in the conveyance direction, and chips conveyed by the conveyance belt 62 fall into the collection box 65 from the opening 63d and are collected. Similarly to the horizontal portion 63 c of the support member 63, the storage tank 64 is inserted from the same insertion port 10 c and disposed below the horizontal portion 63 a, and stores the cutting fluid flowing down from the conveyance belt 62.

  Thus, in the recovery device 60, when chips and cutting fluid fall from the chip discharge hole 10b onto the conveyor belt 62 rotated by a drive motor (not shown), the chips are transferred to the conveyor belt 62. It is placed on the top and transported toward the outside of the apparatus, and dropped into the recovery box 65 and recovered at the downstream end in the transport direction. On the other hand, the cutting fluid further flows down from the conveyor belt 62 and is stored in the storage tank 64.

  The bed 10, the first saddles 21 and 31, and the second saddles 22 and 32 have guide devices 41, 42, 43, 44, and 45 and feed devices 46, 47, 48, 49, and 45, respectively. A cover (not shown) covering 50 and the like is appropriately attached, and chips and cutting fluid are guided to the chip discharge hole 10b by this cover.

  The cover body 16 separates the inside and the outside of the lathe 1 and prevents chips and cutting fluid from splashing outside, and opens upward about an axis parallel to the width direction of the bed 10. A door 16a for forming an opening 16b is provided on the upper surface of the cover body 16 and the side surface of the cover body 16 on the tailstock 14 side.

  The door 16a is provided for an operator to open the door 16a and perform various operations such as attachment and detachment of the workpiece W from the opening 16b. In order to facilitate such operation, the height of the bed 10 is increased. Is set low, and the overall height of the lathe 1 is low. The opened door 16a is supported by an appropriate support mechanism (not shown) that prevents the door 16a from closing.

  The opening 16b is formed so that the distances from the opening end surfaces on both sides in the width direction of the bed 10 to the symmetry plane M are equal, and from the side of the cover body 16 on the tailstock 14 side to the cover body 16 on the headstock 11 side. It is formed over the top surface.

  According to the lathe 1 of this example configured as described above, for example, first, the chuck 13 of the spindle 12 of the spindle stock 11 is gripped on one end side of the workpiece W, and then by a control device (not shown). Under the control, the head stock 11 is moved in the Z-axis direction by the first feeder 46. The movement position of the headstock 11 in the Z-axis direction is set to a position where the other end side of the work W is closer to the tailstock 14 side from a position where the other end side of the work W comes into contact with the tailstock 15 of the tailstock 14. The drive motor 46a that is feedback-controlled by a device (not shown) is continuously driven after the other end side of the work W comes into contact with the tailstock 15, and the other end side is driven by the thrust of the drive motor 46a. Supported by a tailstock 15.

  Thereafter, the main spindle 12 is rotated about the axis by a rotation driving device (not shown) to rotate the workpiece W, and the first tool post 20 and the second tool post are controlled under the control of the control device (not shown). When 30 is moved in the Z-axis direction, the X1-axis direction, or the X2-axis direction, the workpiece W is machined into a predetermined shape.

  When machining, a predetermined tool T out of a plurality of tools T mounted on the turrets 24 and 34 of the tool rests 20 and 30 is preliminarily placed at a predetermined machining position by the indexing mechanisms 25 and 35. It has been determined.

  Then, the chips generated by the cutting process and the cutting fluid appropriately supplied to the contact portion between the tool T and the workpiece W fall on the conveyor belt 62 through the chip discharge hole 10b, and the chips are The cutting fluid is transported by the transport belt 62 and collected in the collection box 65, while the cutting fluid flows further downward from the transport belt 62 and is stored in the storage tank 64.

  Thus, according to the lathe 1 of this example, the tailstock 14 having a simple structure and not so large shape as the head stock 11 is fixed on the upper surface of the end of the bed 10, and the width direction of the bed 10 Since the distance from each side surface on both sides to the central portion (said symmetry plane M), that is, the axes of the main shaft 12 and the tailstock 15 is made equal, the outer shape of the lathe 1 is made compact. When performing various operations, the operation can be performed from either of the side surfaces on both sides in the width direction of the bed 10 and the side surface on the tailstock 14 side in the longitudinal direction of the bed 10. As a result, the workability of the operator can be improved, and restrictions imposed upon the layout of the lathe 1 can be reduced as much as possible, so that the layout can be performed flexibly.

  Moreover, since the four insertion openings 10c opened to each of the four side surfaces of the bed 10 are formed, the insertion openings 10c for inserting the discharge mechanism 61 and the storage tank 64 of the collection device 60 according to the layout of the lathe 1 are provided. The lathe 1 can be appropriately changed, and the lathe 1 can be laid out more flexibly.

  In addition, since the cover body 16 is provided, it is possible to prevent chips and cutting fluid from splashing to the outside, and the openings 16b of the cover body 16 are provided at the openings on both sides in the width direction of the bed 10. Since the distance from the end surface to the symmetry plane M is equal, and the cover body 16 is formed from the side surface of the cover body 16 on the tailstock 14 side to the top surface of the cover body 16 on the headstock 11 side, the operator opens the door 16a. The work to be performed can be easily performed from either of the side surfaces on both sides in the width direction of the bed 10 and the side surface on the tailstock 14 side in the longitudinal direction of the bed 10, and the operator can efficiently perform the work.

  Further, when the lathe 1 is maintained, since the tailstock 14 is fixed to the bed 10, the maintenance of the tailstock 14 can be omitted, thereby reducing the maintenance area. Efficient maintenance.

  Further, since the tailstock 14 having a lower rigidity than that of the headstock 11 is fixed to the bed 10 and the headstock 11 is moved, the rigidity of the tailstock 14 can be increased. By effectively preventing the axis of the tailstock 15 from being inclined or the tailstock 14 from being distorted by the force when the other end of W is pressed against the tailstock 15, the processing accuracy of the workpiece W is increased. be able to.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the above example, the discharge mechanism 61 and the storage tank 64 of the collection device 60 are inserted from the insertion port 10c on the headstock 11 side in the longitudinal direction of the bed 10, but this is not a limitation, and any other You may make it insert from the insertion port 10c.

  Further, the other end side of the workpiece W is supported by the tailstock 15 of the tailstock 14 by the thrust of the drive motor 46a of the first feeder 46. However, the present invention is not limited to this. An appropriate hydraulic mechanism for moving the push shaft 15 in the axial direction may be provided and supported as follows. That is, after the head stock 11 having one end side of the work W held by the main shaft 12 is moved in the Z-axis direction and the other end side of the work W is brought into contact with the tailstock 15 of the tailstock 14, The mechanism is operated to move the tailstock shaft 15 toward the main shaft 12 and press it against the other end side of the workpiece W with a predetermined force, thereby supporting the other end side of the workpiece W by the tailstock shaft 15.

  Further, for example, first, the other end side of the work W is pressed against the tailstock 15 of the tailstock 14, and then the headstock 11 is moved in the Z-axis direction by the first feeding device 46, so Is held by the chuck 13 of the main shaft 12 so that the work W is held between the chuck 13 and the tailstock shaft 15.

  Moreover, although it comprised so that the door 16a of the said cover body 16 might open upwards, you may comprise from the sliding door 16a. Further, the recovery device 60 may be configured by only the recovery box 65 by omitting the discharge mechanism 61 and the storage tank 64, and the recovery box 65 may be disposed below the chip discharge hole 10b.

It is the perspective view which showed schematic structure of the lathe which concerns on one Embodiment of this invention. It is a top view of the lathe shown in FIG. It is a front view of the lathe shown in FIG. It is sectional drawing of the arrow AA direction in FIG. It is the front view which showed schematic structure of the lathe which concerns on a prior art example. FIG. 6 is a side view of the lathe shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lathe 10 Bed 10b Chip discharge hole 10c Insert 11 Spindle 12 Spindle 13 Chuck 14 Tailstock 15 Tailstock 16 Cover body 16a Door 20 First turret 30 Second turret 40 Moving mechanism 60 Recovery device 61 Discharge Mechanism 64 Storage tank 65 Collection box

Claims (5)

A bed, a spindle stock disposed on the bed, a spindle supported by the spindle stock so that the axis is horizontal and rotatable about the axis, and holding one end of a workpiece; and the spindle A rotation drive mechanism that rotates the axis around the axis, a tailstock disposed on the bed facing the spindle, and supported by the tailstock so as to be coaxial with the axis of the spindle, A tailstock that supports the other end side of the workpiece, a tool rest that is disposed on the bed so as to be movable in the main shaft axis direction and a direction orthogonal thereto, and that holds the tool. A lathe equipped with a tool post feed mechanism for moving in a direction,
The spindle stock is configured to be movable in the spindle axial direction, while the tailstock is fixed to the bed,
A lathe, wherein the headstock is configured to be moved in the spindle axis direction by a headstock feed mechanism. The bed is formed in a rectangular shape when viewed from above, and at least the outer shape of the vertical section in the bed width direction is formed symmetrically with respect to a predetermined vertical symmetry plane,
The lathe according to claim 1, wherein the headstock and the tailstock are arranged on the bed upper surface so that the axes of the main shaft and the tailstock are included in the symmetry plane. Further comprising chip recovery means for recovering chips, the bed is opened in the upper surface between the headstock and the tailstock, and a chip discharge hole formed in the vertical direction, and a horizontal direction And one side communicates with the lower portion of the chip discharge hole, and the other side includes four insertion openings opened on each side surface,
The lathe according to claim 2, wherein the chip collecting means is inserted from one of the insertion openings and is disposed below the chip discharge hole. The headstock, the tailstock, the tool post, and a cover body surrounding at least the bed upper surface;
4. The lathe according to claim 3, wherein the cover body includes a door for forming an opening on the upper surface thereof.   The opening of the cover body is formed from the upper side of the tailstock to the opposite side so that the distances from the opening end surfaces on both sides of the bed width direction to the symmetry plane are equal to each other. The lathe according to claim 4, characterized in that:

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