JP4579070B2 - lathe - Google Patents

Description

  In the present invention, a shaft is disposed horizontally, a main shaft that holds one end of the workpiece, a main shaft that rotatably supports the main shaft, and a tool table that is disposed above and below the main shaft axis, respectively. The present invention relates to a lathe provided with two turrets for holding.

  Conventionally, as the lathe, for example, what is disclosed in JP-T-2002-538777 is known, and this lathe is arranged such that a rectangular bed and an axis are horizontal and parallel to the front surface of the bed. A main shaft that holds one end of the workpiece, a main shaft that is fixed to the upper part of the front surface of the bed, and that rotatably supports the main shaft about its axis, and a rotation drive mechanism that rotates the main shaft about its axis A first turret and a second turret disposed on an upper surface of the bed so as to be movable in the spindle axis direction and the vertical direction, and the bed movably in the spindle axis direction and the vertical direction. And a third tool post for holding a tool.

  The first turret and the second turret are provided along a vertical direction on the front surface of the saddle, which is guided by a guide member provided on the upper surface of the bed in parallel with the spindle axis and moves in the spindle axis direction. And a tool post main body which is guided by the guided member and moves in the vertical direction. The tool post main body is disposed above the spindle axis so that the held tool is separated from the workpiece from above.

  The third tool post includes a saddle that is guided by a guide member provided in parallel to the spindle axis at the lower front surface of the bed and moves in the spindle axis direction, and a guide member that is provided on the front surface of the saddle along the vertical direction. And a tool post body that is guided in the vertical direction and is arranged below the spindle axis, and makes the held tool come into contact with the workpiece from below.

  The saddles and the tool post main bodies constituting the first tool post, the second tool post and the third tool post are moved in a predetermined direction by respective feed mechanisms respectively corresponding thereto.

  In the lathe configured as described above, after holding the one end side of the workpiece on the spindle of the spindle stock, the workpiece is rotated by rotating the spindle about its axis by the rotation drive mechanism, and the first tool post When the second tool post and the third tool post are moved in the spindle axis direction and the vertical direction by the corresponding feed mechanisms, the workpiece is processed into a predetermined shape.

JP-T-2002-538977

  By the way, during processing of the workpiece, the temperature of the headstock supporting this bearing rises due to heat generated by a heat source such as a bearing that rotatably supports the spindle, and the heat of the headstock is conducted to the bed. The bed is thermally deformed. The thermal deformation state of the bed differs depending on the distance from the headstock mounting portion, the bed shape, and the like.

  Therefore, in the above conventional lathe in which the first tool post and the second tool post are arranged on the upper surface of the bed and the third tool post is arranged on the lower front surface of the bed, Since the thermal deformation state is different, the amount of thermal displacement generated in the relative positional relationship between the tool and the work held on the first tool post or the second tool post on the upper surface of the bed and the third tool post on the lower front of the bed The amount of thermal displacement that occurs in the relative positional relationship between the tool held on the platform and the workpiece will be different, and the workpiece will be machined with the third tool post when machining the workpiece with the first tool post or the second tool post. However, there is a problem that the dimensional accuracy after processing differs depending on the case, that is, the workpiece cannot be processed with high accuracy.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a lathe capable of machining a workpiece with high accuracy.

To achieve the above object, the present invention provides:
Bed and
A column having a vertical front surface and standing on the bed;
A spindle that has an axis horizontal and parallel to the front surface of the column, and holds one end of the workpiece;
A headstock disposed on the front surface of the column and rotatably supporting the spindle about its axis;
A rotation drive mechanism for rotating the main shaft about its axis;
Disposed on the front upper portion of the movably said column in a direction orthogonal the spindle axis direction and with this, a first edge thereof table for holding a tool, the front upper portion of the column movably in the spindle axis direction A first turret including a first saddle disposed on the front surface of the first saddle movably in the orthogonal direction ;
A second turret is provided at the lower front portion of the column so as to be movable in the direction of the spindle axis and in a direction perpendicular thereto, and holds a tool, and is movable at the lower portion of the front of the column in the direction of the spindle axis. A second tool post comprising: a first saddle disposed; and a second saddle disposed on the front surface of the first saddle so as to be movable in the orthogonal direction ;
A first turret feed mechanism for moving a first saddle of the first turret in the direction of the main shaft axis, a feed member fixed to the first saddle, and a column of the column parallel to the main shaft axis. A first tool post feeding mechanism provided with a feeding member disposed on the upper surface of the front surface and having a feeding member that engages with the feeding member and moves the feeding member in the main shaft axis direction ;
A second tool post feed mechanism for moving the second saddle of the first tool post in the orthogonal direction;
A third turret feed mechanism for moving the first saddle of the second turret in the direction of the spindle axis, and a feed member fixed to the first saddle, and a column of the column parallel to the spindle axis A third tool post feed mechanism provided at a lower portion of the front surface, and comprising a feed member that engages with the feed member and moves the feed member in the direction of the spindle axis ;
A fourth tool post feed mechanism for moving the second saddle of the second tool post in the orthogonal direction ;
A first turret guide mechanism that is disposed between an upper front portion of the column and a first saddle of the first turret, and guides the movement of the first saddle ;
A second turret guide mechanism for guiding the movement of the second saddle of the first turret ;
A third turret guide mechanism that is disposed between the front lower portion of the column and the first saddle of the second turret, and guides the movement of the first saddle ;
In lathe and a fourth tool rest guide mechanism for guiding movement of the second tool post of the second saddle,
The column is formed such that at least an outer shape of a vertical section perpendicular to the main axis is vertically symmetrical with respect to a horizontal symmetry plane,
The headstock is arranged such that the spindle axis is included in the plane of symmetry,
The first turret guide mechanism and the third turret guide mechanism are provided vertically symmetrically with respect to the symmetry plane,
The first saddle of each turret is supported on the front surface of the column via the first turret guide mechanism and the third turret guide mechanism so as to be vertically symmetric with respect to the symmetry plane,
The feed member of the first tool post feed mechanism and the feed member of the third tool post feed mechanism are respectively arranged vertically symmetrically with respect to the symmetry plane .

  According to this invention, after holding the one end side of the workpiece on the spindle of the spindle stock, the workpiece is rotated by rotating the spindle about its axis by the rotation drive mechanism, and each turret is rotated by the feed mechanism. When the workpiece is moved in the axial direction or a direction perpendicular thereto, the workpiece is processed into a predetermined shape.

  In the present invention, as described above, the column is formed such that the outer shape of the vertical cross section thereof is vertically symmetric with respect to a horizontal symmetry plane, and the main spindle axis is included in the symmetry plane. In addition, the first tool post and the second tool post are respectively arranged on the front surface of the column so that the arrangement positions thereof are vertically symmetric with respect to the symmetry plane, that is, the headstock mounting part of the column, Since the distance to each tool post mounting portion is the same, even if the heat of the headstock is conducted to the column and the column is thermally deformed, the heat deformation state is changed between the upper side and the lower side across the spindle axis. The amount of thermal displacement that occurs in the relative positional relationship between the tool held on the first tool post and the workpiece, and the tool and workpiece held on the second tool post. The amount of thermal displacement that occurs in the relative positional relationship can be made comparable.

  Therefore, according to the lathe according to the present invention, even if the workpiece is processed using the first tool post or the workpiece is processed using the second tool post, the workpiece can be processed with the same processing accuracy. The workpiece can be processed with high accuracy.

In addition , the first tool post guide mechanism and the third tool post guide mechanism are provided vertically symmetrically with respect to the symmetry plane, and the first saddle of each tool post is vertically symmetrical with respect to the symmetry plane. Since the first turret guide mechanism and the third turret guide mechanism are supported on the front surface of the column, it is preferable that the first turret and the second turret can be strictly symmetrical .

In addition, since the feed member of the first tool post feed mechanism and the feed member of the third tool post feed mechanism are arranged vertically symmetrically with respect to the symmetry plane, the amount of thermal displacement of the feed member is made the same. The positioning accuracy by each of the tool post feeding mechanisms can be made the same, and, similarly to the above, whether the workpiece is processed using the first tool post or the workpiece using the second tool post, The workpiece can be machined with the same machining accuracy, and the workpiece can be machined with high accuracy .

  As described above, according to the lathe according to the present invention, each turret is arranged symmetrically on the front surface of the column, and the thermal deformation state of the column and the arrangement of the second turret in the arrangement portion of the first turret are arranged. By making the thermal deformation state of the column in the installation portion substantially the same, the workpiece machining accuracy when using the first turret and the workpiece machining accuracy when using the second turret are made substantially the same. As a result, the machining accuracy of the workpiece can be improved.

  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 side 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 bottom view of the lathe shown in FIG. 5 and 6 are perspective views showing a schematic configuration of a lathe including a cover structure according to the present embodiment, and FIGS. 7 and 8 are cross-sections in the direction indicated by arrows AA in FIG. FIG.

  As shown in FIGS. 1 to 8, a lathe 1 of this example includes a bed 10 that is formed in a rectangular shape, a column 11 that is also formed in a rectangular shape and is erected on the upper surface of the bed 10, and an axis that is a column. 11 is parallel to the front surface of the main body 11 and horizontally disposed, the chuck 14 is attached to the tip of the main shaft 13 and grips one end of the work W, and is fixed to the front surface of the column 11. A spindle stock 12 that is rotatably supported at the center, a tailstock 15 that is disposed on the front surface of the column 11 so as to face the spindle stock 12 and is movable in the axial direction (Z-axis direction) of the spindle 13; A tailstock 16 is supported by the tailstock 15 coaxially with the axis of the main shaft 13 and supports the other end side of the workpiece W. The tailstock 15 is disposed vertically on the front surface of the column 11 with the axis of the main shaft 13 interposed therebetween. Axis direction (Z-axis direction) and vertical direction perpendicular thereto Made of first and second tool rest 20, 25 being movable in the X-axis direction).

  The lathe 1 includes a rotation drive mechanism 30 that rotates the spindle 13 around its axis, a first feed mechanism 40 that moves the tailstock 15 in the Z-axis direction, and the tailstock 15 in the Z-axis direction. A first guide mechanism 41 that guides the movement, a second feed mechanism 42 that moves the first tool post 20 in the Z-axis direction, and a second guide mechanism 43 that guides the movement of the first tool post 20 in the Z-axis direction. A third feed mechanism 44 for moving the first tool rest 20 in the X-axis direction, a third guide mechanism 45 for guiding the movement of the first tool rest 20 in the X-axis direction, and the second tool rest 25 for Z A fourth feed mechanism 46 that moves in the axial direction, a fourth guide mechanism 47 that guides movement of the second tool rest 25 in the Z-axis direction, and a fifth feed mechanism that moves the second tool rest 25 in the X-axis direction. 48 and a fifth guide mechanism 49 for guiding the movement of the second tool rest 25 in the X-axis direction.

  Further, the lathe 1 is provided with a supporting device 50 that supports the bottom surface of the bed 10, chips generated by the cutting process, and a cutting fluid that is appropriately supplied to a contact portion between the workpiece W and the tool T. And a cover 60 for preventing each of the feed mechanisms 40, 42, 44, 46, 48 and the guide mechanisms 41, 43, 45, 47, 49 from entering, and a collection for collecting the chips. Device 80.

  The bed 10 is formed on the rear surface side of the upper surface thereof, the mounting portion 10a on which the lower surface of the column 11 is placed and fixed, and a chip discharge having one end opened on the front surface side of the upper surface and the other end opened on the rear surface. And one end opening of the chip discharge hole 10b is formed in a funnel shape so as to guide chips and cutting fluid onto the discharge mechanism 81 of the recovery device 80, as will be described later. It has become.

  The column 11 is formed so that the outer shape of the vertical cross section perpendicular to the axis of the main shaft 13 is vertically symmetrical with respect to the horizontal symmetry plane M, with a convex portion 11a at the center of the front surface and a concave portion at the upper front portion and the lower front portion. 11b is formed along the Z-axis direction.

  The spindle stock 12 and the tailstock 15 are formed so that the outer shape of the vertical cross section perpendicular to the axis of the spindle 13 is vertically symmetrical with respect to the symmetry plane M, and the axes of the spindle 13 and the tailstock 16 are the symmetry plane. It is arranged on the front surface of the column 11 so as to be included in M.

  The arrangement positions of the first tool post 20 and the second tool post 25 are vertically symmetric with respect to the symmetry plane M, and the first tool post 20 is provided at the upper part of the front surface of the column 11 so as to become the main shaft 13. The second tool post 25 is provided at the lower part of the front surface of the column 11 and is configured to be separated from the workpiece W from below the axis of the main shaft 13. .

  In addition, the first tool post 20 and the second tool post 25 are provided with first saddles 21 and 26 disposed on the front upper portion or lower front portion of the column 11 so as to be movable in the Z-axis direction, and the first saddles 21 and 26. Second saddles 22 and 27 disposed on the front surface so as to be movable in the X-axis direction, and polygons fixed to the front surfaces of the second saddles 22 and 27 and mounted so that a plurality of tools T protrude from the outer peripheral surface. The turret bodies 23 and 28 that support the columnar turrets 23a and 28a so as to be rotatable about a rotation center axis parallel to the axis of the main shaft 13, and the turrets 23a and 28a are rotated about the rotation center axis to thereby obtain a predetermined tool T. Is constituted by indexing mechanisms 24, 29, etc., for indexing to a predetermined processing position.

  The rotary drive mechanism 30 includes a drive motor (not shown) supported by a support member 31 attached to the side surface of the column 11, a first pulley 32 provided on the output shaft of the drive motor, and a rear of the main shaft 13. A second pulley 33 provided at the end and a drive belt 34 spanned between the pulleys 32 and 33 are provided, and the rotational power of the drive motor is transmitted via the first pulley 32, the drive belt 34 and the second pulley 33. To the main shaft 13, and the main shaft 13 (the chuck 14 and the workpiece W) is rotated about its axis.

  The first feed mechanism 40 is arranged on the Z axis so as to be included in the symmetry plane M between the drive motor 40a fixed to the front surface of the convex portion 11a of the column 11 and the convex portion 11a and the tailstock 15. And a nut 40c fixed to the back surface of the tailstock 15 and screwed with the ball screw 40b. 41 is composed of a guide rail 41a disposed along the Z-axis on the front surface of the convex portion 11a, and a slider 41b fixed to the back surface of the tailstock 15 and movably engaged with the guide rail 41a. .

  In the first feed mechanism 40 and the first guide mechanism 41, when the drive motor 40a is driven to rotate the ball screw 40b about the axis and the nut 40c moves along the ball screw 40b, the tailstock 15 is moved to the guide rail 41a. And it is guided by the slider 41b and moves in the Z-axis direction.

  The second feed mechanism 42 and the fourth feed mechanism 46 are disposed along the Z axis in the recess 11b along with drive motors 42a and 46a attached to the recess 11b on the front surface of the column 11, and are driven by the drive motors 42a and 46a. Ball screws 42b and 46b rotated about the shaft center, and nuts 42c and 46c fixed to the back surfaces of the first saddles 21 and 26 and screwed with the ball screws 42b and 46b, and the second guide mechanism 43 and The fourth guide mechanism 47 is fixed to the guide rails 43a and 47a disposed along the Z axis on both sides of the recess 11b on the front surface of the column 11, and the back surfaces of the first saddles 21 and 26. The sliders 43b and 47b are movably engaged with 47a.

  The ball screws 42b and 46b and the guide rails 43a and 47a are provided vertically symmetrically with respect to the symmetry plane M, and each tool post 20, via the guide rails 43a and 47a and the sliders 43b and 47b. 25 first saddles 21 and 26 are supported on the front surface of the column 11 symmetrically.

  In the second feed mechanism 42 and the fourth feed mechanism 46, and the second guide mechanism 43 and the fourth guide mechanism 47, the drive motors 42a and 46a are driven, and the ball screws 42b and 46b rotate around the axis, along the same. When the nuts 42c and 46c move, the first saddles 21 and 26 are guided by the guide rails 43a and 47a and the sliders 43b and 47b and move in the Z-axis direction.

  The third feed mechanism 44 and the fifth feed mechanism 48 are disposed along the X axis on the front surfaces of the first saddles 21 and 26 and the drive motors 44a and 48a fixed to the front surfaces of the first saddles 21 and 26. The ball screws 44b and 48b rotated about the axis by the drive motors 44a and 48a, and nuts (not shown) attached to the side surfaces of the second saddles 22 and 27 and screwed with the ball screws 44b and 48b. The third guide mechanism 45 and the fifth guide mechanism 49 are provided on the front surfaces of the first saddles 21 and 26 on the back surfaces of the guide rails 45a and 49a disposed along the X axis and the second saddles 22 and 27, respectively. The sliders 45b and 49b are fixedly provided and movably engaged with the guide rails 45a and 49a.

  In the third feed mechanism 44 and the fifth feed mechanism 48, and the third guide mechanism 45 and the fifth guide mechanism 49, the drive motors 44a and 48a are driven to rotate the ball screws 44b and 48b about the axis, and along this. When the nut (not shown) moves, the second saddles 22 and 27 are guided by the guide rails 45a and 49a and the sliders 45b and 49b to move in the X-axis direction.

  The support device 50 includes a first support mechanism 51, a second support mechanism 52, and a third support mechanism 53, each of which includes a jack or the like. The first support mechanism 51 is located on the front side of the bed 10 and in the Z-axis direction. The bottom surface is supported at the central portion, and the second support mechanism 52 and the third support mechanism 53 are configured to support the bottom surface at the rear surface side of the bed 10 and at both end portions in the Z-axis direction.

  In the support device 50, the support height of the bottom surface of the bed 10 by the second support mechanism 52 and the third support mechanism 53 is adjusted based on the support height of the bottom surface of the bed 10 by the first support mechanism 51. Thus, the support posture of the bed 10, that is, the installation posture of the lathe 1 is adjusted to a predetermined state.

  The cover 60 divides the inside and outside of the lathe 1 and prevents the chips and cutting fluid from splashing outside. The cover 60 is provided inside the lathe 1 so that the chips and cutting fluid can be fed to each of the feeds. The mechanism 40, 42, 44, 46, 48 and the inner cover 62 for preventing the guide mechanisms 41, 43, 45, 47, 49 from entering.

  The outer cover 61 is provided with a double-open slide door 61a on the front side of the lathe 1, and an operator slides the slide door 61a left and right to open and close, for example, various operations such as attaching and detaching the workpiece W. I do.

  The inner cover 62 includes a first protective cover 63 provided on the left side (the headstock 12 side) of the tool post body 23 of the first tool post 20 and the right side (the headstock 12 of the tool post body 23 of the first tool post 20). A second protective cover 64 provided on the opposite side), a third protective cover 65 provided on the left side (the headstock 12 side) of the tool post body 28 of the second tool post 25, and the tool of the second tool post 25. A fourth protective cover 66 provided on the right side of the pedestal main body 28 (opposite to the headstock 12) and a support part provided at the tip of the headstock 12 and supporting the first protective cover 63 and the third protective cover 65. A fifth protective cover 67 provided with 67a, a sixth protective cover 68 provided between the fifth protective cover 67 and the tailstock 15, a first protective cover 63, a second protective cover 64, and a sixth protective cover. 68, a seventh protective cover 6 provided between A third protective cover 65, an eighth protective cover 70 provided between the fourth protective cover 66 and the sixth protective cover 68, and upper and lower parts of the tool post body 23 of the first tool post 20, respectively. A first upper closing cover 71 and a first lower closing cover 72 for closing an opening between the first protective cover 63 and the second protective cover 64, and upper and lower parts of the tool post body 28 of the second tool post 25. The cover includes various covers such as a second upper closing cover 73 and a second lower closing cover 74 that close an opening between the third protective cover 65 and the fourth protective cover 66.

  The first protective cover 63 is composed of a plate-like member, and is supported so as to be movable in the Z-axis direction by a support portion 67a of the fifth protective cover 67. The second protective cover 64 is extendable and contractable. A telescopic cover that is configured to allow movement of the first tool post 20 (first saddle 21) in the Z-axis direction, has a right end connected to the inner surface of the outer cover 61, and a left upper end. Is connected to the upper right end of the first protective cover 63 via a first upper closing cover 71.

  The first protective cover 63 and the second protective cover 64 mainly cover the second feed mechanism 42 and the second guide mechanism 43 and the third feed mechanism 44 and the third guide mechanism 45 so as to cover the first tool post 20. The tool post main body 23 is disposed in an opening formed between the covers 63 and 64 so as to be movable in the X-axis direction.

  The first upper closing cover 71 covers the first member 71a attached to the upper part of the tool post body 23, the first member 71a, and the upper end on the right side of the first protective cover 63 and the left side of the second protective cover 64. The second member 71b is connected to the upper end of the first member 71b so that the first member 71a does not come out of the second member 71b even if the tool post body 23 moves to the lower end position in the X-axis direction. .

  The first lower closing cover 72 is composed of a plate-like member attached to the lower part of the tool rest main body 23 so as to overlap with the front surfaces of the first protective cover 63 and the second protective cover 64.

  The third protective cover 65 is composed of a plate-like member, and is supported by the support portion 67a of the fifth protective cover 67, the eighth protective cover 70, and the like so as to be movable in the Z-axis direction. Reference numeral 66 denotes a telescopic cover that is configured to be extendable and allow movement of the second tool post 25 (first saddle 26) in the Z-axis direction, and the right end is formed on the inner surface of the outer cover 61. The left lower end is connected to the right lower end of the third protective cover 65 via the second lower closing cover 74.

  The third protective cover 65 and the fourth protective cover 66 mainly cover the fourth feed mechanism 46 and the fourth guide mechanism 47, the fifth feed mechanism 48 and the fifth guide mechanism 49, and the chip discharge hole 10b. The blade is disposed on the front side of the second saddle 27 of the second tool rest 25 so as to be positioned in front of the inner surface on the back side of the one end opening of the blade, and the blade is formed in the opening formed between the covers 65 and 66. A table body 28 is arranged so as to be movable in the X-axis direction.

  The first lower closing cover 74 is covered with a first member 74 a attached to the lower part of the tool post body 28, the first member 74 a, and a lower end portion on the right side of the third protective cover 65 and the fourth protective cover 66. The second member 74b is connected to the lower end on the left side, and the second member 74b does not come out of the first member 74a even when the tool post body 28 moves to the upper end position in the X-axis direction. Yes.

  The second upper closing cover 73 is composed of a plate-like member attached to the upper part of the tool rest main body 28 so as to overlap with the back surfaces of the third protective cover 65 and the fourth protective cover 66.

  The sixth protective cover 68 is a telescopic cover that is configured to be extendable and allow movement of the tailstock 15 in the Z-axis direction, and the left end is connected to the fifth protective cover 67. The right end is connected to the tailstock 15, and the seventh protective cover 69 and the eighth protective cover 70 have the left end connected to the fifth protective cover 67 and the right end external. It is composed of a plate-like member connected to the inner surface of the cover 61. The sixth protective cover 68, the seventh protective cover 69, and the eighth protective cover 70 are disposed so as to mainly cover the first feed mechanism 40 and the first guide mechanism 41.

  The lower part of the first protective cover 63 and the second protective cover 64 is provided so as to overlap the upper front surface of the seventh protective cover 69, and the upper part of the sixth protective cover 68 is the lower rear surface of the seventh protective cover 69. Further, the lower part of the third protective cover 65 and the fourth protective cover 66 are provided so as to overlap the lower front surface of the eighth protective cover 70, and the upper part of the third protective cover 65 and the fourth protective cover 66 is provided so as to overlap the upper back surface of the eighth protective cover 70. These protective covers 63, 64, 65, 66, 68, 69, and 70 are arranged in substantially the same plane.

  Further, the first protective cover 63 and the second protective cover 64 are each provided with an engaging member 76 that is movably engaged with a guide member 75 disposed along the Z axis. The movement of the first protective cover 63 and the second protective cover 64 in the Z-axis direction is guided by the engagement relationship with the engaging member 76, but the third protective cover 65 and the fourth protective cover 66. Also, the movement in the Z-axis direction may be guided.

  In the inner cover 62, when the tool rests 20 and 25 move to the headstock 12 side, as shown in FIG. 6, the first protective cover 63 and the third protective cover 65 together with the tool rests 20 and 25 are moved in this direction. When the second protective cover 64 and the fourth protective cover 66 are moved and the respective tool rests 20 and 25 are moved to the opposite side of the headstock 12, together with the tool rests 20 and 25 as shown in FIG. The first protective cover 63 and the third protective cover 65 move in the direction, and the second protective cover 64 and the fourth protective cover 66 contract. Although not shown, the sixth protective cover 68 also contracts when the tailstock 15 moves in a direction approaching the headstock 12 and expands when moved in a direction away from the headstock 12.

  When the first tool post 20 and the second tool post 25 move up and down, as shown in FIGS. 5 to 8, the first member 71a of the first upper closing cover 71 and the first lower closing cover 72 move up and down. The first member 74a of the second lower closing cover 74 and the second upper closing cover 73 move up and down, but at this time, between the first member 71a, 74a and the second member 71b, 74b, A gap is not formed between the first lower closing cover 72 and the first protective cover 63 and the second protective cover 64 and between the second upper closing cover 73 and the third protective cover 65 and the fourth protective cover 66. It has become.

  In this way, the front side of the column 11 is covered with the above-described covers 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, so that chips and cutting fluid can be obtained. Is prevented from entering the feed mechanisms 40, 42, 44, 46, 48 and the guide mechanisms 41, 43, 45, 47, 49.

  The collection device 80 includes a discharge mechanism 81 that conveys chips in a predetermined conveyance direction and discharges the chips outside the apparatus, and a storage tank 84 that is disposed below the discharge mechanism 81 on the upstream side in the conveyance direction and stores cutting fluid. And a recovery box 85 disposed below the discharge mechanism 81 at the downstream end in the transport direction.

  The discharging mechanism 81 is configured by connecting a plurality of plates in an endless ring shape, and includes a conveying belt 82 that conveys chips, a horizontal portion 83a, and an inclined portion 83b. The discharging mechanism 81 accommodates the conveying belt 82 and is rotatable. And a drive motor (not shown) for rotating the conveyor belt 82 in the direction indicated by the arrow (see FIGS. 7 and 8).

  The horizontal portion 83a of the support member 83 is formed with an opening at the top and bottom, and the tip end portion (the end portion on the upstream side in the transport direction) is in the chip discharge hole 10b and the other end side opening portion (of the bed 10). Inserted from the rear opening) and disposed below the one end opening (front opening on the upper surface of the bed 10), and chips and cutting fluid are conveyed from the opening (not shown). The cutting fluid that has fallen on the belt 82 and has fallen on the conveyor belt 82 flows further downward (in the storage tank 84 as will be described later) from the opening (not shown).

  The inclined portion 83b of the support member 83 is disposed outside the lathe 1, the lower surface on the downstream end side in the transport direction is open, and the chips transported by the transport belt 82 are the openings (not shown). And then collected in a collection box 85.

  Like the horizontal portion 83a of the support member 83, the storage tank 84 is inserted into the chip discharge hole 10b from the other end side opening of the chip discharge hole 10b and is disposed below the horizontal portion 83a. The cutting fluid flowing down from the conveyor belt 82 is stored.

  In the recovery device 80, when chips and cutting fluid fall from the opening on one end side of the chip discharge hole 10b onto the conveyor belt 82 rotated by a drive motor (not shown), the chips are transferred to the conveyor belt. It is placed on 82 and conveyed toward the outside of the apparatus, and dropped into the collection box 85 and collected at the downstream end in the conveyance direction. On the other hand, the cutting fluid further flows down from the conveyor belt 82 and is stored in the storage tank 84.

  The chips and cutting fluid fall downward along the outer cover 61 and the inner cover 62 and fall into one end opening of the chip discharge hole 10b, and are guided by the inner surface of the one end opening to convey the conveyor belt 82. Led up.

  According to the lathe 1 of this example configured as described above, after the chuck 14 of the spindle 13 of the spindle base 12 holds one end side of the workpiece W, the tailstock 15 is moved to Z by the first feed mechanism 40. The other end side of the workpiece W is supported by moving in the axial direction. Thereafter, the spindle 13 and the chuck 14 are rotated about the axis by the rotation drive mechanism 30 to rotate the workpiece W, and the first tool post 20 and the second tool post 25 are moved to Z by the feed mechanisms 42, 44, 46 and 48. When moved in the axial direction or the X-axis direction, the workpiece W is processed into a predetermined shape.

  During machining, a predetermined tool T among a plurality of tools T mounted on the turrets 23a and 28a of the tool rests 20 and 25 is preliminarily assigned to a predetermined machining position by the indexing mechanisms 24 and 29. Has been issued.

  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 82 through the chip discharge hole 10b, and the chips are The cutting fluid is transported by the transport belt 82 and collected in the collection box 85, while the cutting fluid flows further downward from the transport belt 82 and is stored in the storage tank 84.

  As described above, in the lathe 1 of this example, the column 11 is formed so that the outer shape of the vertical section thereof is vertically symmetric with respect to the horizontal symmetry plane M, and the spindle stock 12 is symmetrical with respect to the axis of the spindle 13. Since the first tool post 20 and the second tool post 25 are arranged on the front surface of the column 11 so that the arrangement positions thereof are vertically symmetrical with respect to the symmetry plane M so as to be included in the surface M, That is, since the distance between the headstock 12 mounting portion of the column 11 and the tool post 20, 25 mounting portion is the same, the heat of the headstock 12 is conducted to the column 11 and the column 11 is thermally deformed. Even so, the thermal deformation state can be made comparable between the upper side and the lower side across the axis of the main shaft 13, and the relative relationship between the tool T and the workpiece W held on the first tool post 20 can be made. The amount of thermal displacement occurring in the positional relationship and the tool T held on the second tool post 25 A thermal displacement amount generated in the relative positional relationship between the workpiece W can be to the same extent.

  Therefore, according to the lathe 1 of this example, even if the workpiece W is machined using the first tool post 20 or the workpiece W is machined using the second tool post 25, the workpiece W can be processed with the same machining accuracy. The workpiece W can be machined with high accuracy.

  Further, since the guide rail 43a of the second guide mechanism 43 and the guide rail 47a of the fourth guide mechanism 47 are vertically symmetric with respect to the symmetry plane M, the first tool post 20 and the second tool post 25 are strictly moved up and down. It can be symmetrical and is preferable.

  Further, since the ball screw 42b of the second feed mechanism 42 and the ball screw 46b of the fourth feed mechanism 46 are vertically symmetric with respect to the symmetry plane M, the thermal displacement amounts of the ball screws 42b and 46b are made the same. Since the positioning accuracy by the respective feed mechanisms 42 and 46 can be made the same, even if the workpiece W is processed using the first tool post 20 as described above, the workpiece W can be processed using the second tool post 25. Even if processed, the workpiece W can be processed with the same processing accuracy, and the workpiece W can be processed with high accuracy.

  Further, since the headstock 12, the tailstock 15, and the respective tool rests 20 and 25 are provided on the front surface of the column 11, the spindle stock 12, the tailstock 15, the respective tool rests 20 and 25, and the chuck 14 of the main spindle 13. And the distance to the workpiece | work W supported by the tailstock 16 can be shortened, and it can make it easy to perform the various operation | work which an operator performs.

  The first protective cover 63 and the second protective cover 64 cover the second feed mechanism 42, the second guide mechanism 43, the third feed mechanism 44, and the third guide mechanism 45, and the third protective cover 65 and the fourth protection cover. Since the cover 66 covers the fourth feed mechanism 46 and the fourth guide mechanism 47 as well as the fifth feed mechanism 48 and the fifth guide mechanism 49, each feed mechanism 42, 44, 46, 48 and each guide mechanism 43, Compared with the case where 45, 47, and 49 are individually covered, the cover structure can be simplified, chips and cutting fluid can be more reliably prevented, and maintenance can be facilitated. You can also.

  Further, since the support device 50 includes the first support mechanism 51, the second support mechanism 52, and the third support mechanism 53, and the support structure on the bottom surface of the bed 10 is a three-point support structure, the support posture of the bed 10 is supported. This can be easily and efficiently performed when adjusting the (positioning posture of the lathe 1) to a predetermined state. The second support mechanism 52 and the third support mechanism 53 support the bottom surface of the bed 10 at the rear surface side of the bed 10 and at both ends in the Z-axis direction, which is the moving direction of the tool rests 20 and 25, and the column 11. Is disposed on the rear surface side of the upper surface of the bed 10, the turrets 20 and 25 are not moved in the Z-axis direction so that the support state by the support device 50 does not become unstable.

  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.

It is the perspective view which showed schematic structure of the lathe which concerns on one Embodiment of this invention. It is the side view which showed schematic structure of the lathe which concerns on this embodiment. It is the front view which showed schematic structure of the lathe which concerns on this embodiment. It is the bottom view which showed schematic structure of the lathe which concerns on this embodiment. It is a perspective view which shows schematic structure of the lathe including the cover structure etc. based on this embodiment. It is a perspective view which shows schematic structure of the lathe including the cover structure etc. based on this embodiment. It is sectional drawing of the arrow AA direction in FIG. It is sectional drawing of the arrow AA direction in FIG.

DESCRIPTION OF SYMBOLS 1 Lathe 10 Bed 11 Column 12 Headstock 13 Main spindle 14 Chuck 15 Tailstock 16 Tailstock 20 First tool post 25 Second tool post 30 Rotation drive mechanism 40 First feed mechanism 41 First guide mechanism 42 Second feed mechanism 43 second guide mechanism 44 third feed mechanism 45 third guide mechanism 46 fourth feed mechanism 47 fourth guide mechanism 48 fifth feed mechanism 49 fifth guide mechanism 50 support device 51 first support mechanism 52 second support mechanism 53 first 3 support mechanism 60 cover 61 outer cover 62 inner cover 63 first protective cover 64 second protective cover 65 third protective cover 66 fourth protective cover 67 fifth protective cover 68 sixth protective cover 69 seventh protective cover 70 eighth protective Cover 71 First upper closing cover 72 First lower closing cover 73 Second upper closing cover 74 Second lower closing cover 80 Recovery device 8 1 Discharge mechanism 84 Storage tank 85 Collection box

Claims (1)

Bed and
A column having a vertical front surface and standing on the bed;
A spindle that has an axis horizontal and parallel to the front surface of the column, and holds one end of the workpiece;
A headstock disposed on the front surface of the column and rotatably supporting the spindle about its axis;
A rotation drive mechanism for rotating the main shaft about its axis;
Disposed on the front upper portion of the movably said column in a direction orthogonal the spindle axis direction and with this, a first edge thereof table for holding a tool, the front upper portion of the column movably in the spindle axis direction A first turret including a first saddle disposed on the front surface of the first saddle movably in the orthogonal direction ;
A second tool post that is disposed in the lower front portion of the column so as to be movable in the direction of the main spindle axis and in a direction orthogonal thereto, and holds a tool, and is movable in the lower direction of the front of the column so as to be movable in the main axis direction. A second tool post comprising: a first saddle disposed; and a second saddle disposed on the front surface of the first saddle so as to be movable in the orthogonal direction ;
A first turret feed mechanism for moving a first saddle of the first turret in the direction of the main shaft axis, a feed member fixed to the first saddle, and a column of the column parallel to the main shaft axis. A first tool post feeding mechanism provided with a feeding member disposed on the upper surface of the front surface and having a feeding member that engages with the feeding member and moves the feeding member in the main shaft axis direction ;
A second tool post feed mechanism for moving the second saddle of the first tool post in the orthogonal direction;
A third turret feed mechanism for moving the first saddle of the second turret in the direction of the main shaft axis, a feed member fixed to the first saddle, and a column of the column parallel to the main shaft axis. A third tool post feed mechanism provided at a lower portion of the front surface, and comprising a feed member that engages with the feed member and moves the feed member in the direction of the spindle axis ;
A fourth tool post feed mechanism for moving the second saddle of the second tool post in the orthogonal direction ;
A first turret guide mechanism that is disposed between an upper front portion of the column and a first saddle of the first turret, and guides the movement of the first saddle ;
A second turret guide mechanism for guiding the movement of the second saddle of the first turret ;
A third turret guide mechanism that is disposed between the front lower portion of the column and the first saddle of the second turret, and guides the movement of the first saddle ;
In lathe and a fourth tool rest guide mechanism for guiding movement of the second tool post of the second saddle,
The column is formed such that at least an outer shape of a vertical section perpendicular to the main axis is vertically symmetrical with respect to a horizontal symmetry plane,
The headstock is arranged such that the spindle axis is included in the plane of symmetry,
The first turret guide mechanism and the third turret guide mechanism are provided vertically symmetrically with respect to the symmetry plane,
The first saddle of each turret is supported on the front surface of the column via the first turret guide mechanism and the third turret guide mechanism so as to be vertically symmetric with respect to the symmetry plane,
The lathe characterized in that the feed member of the first tool post feed mechanism and the feed member of the third tool post feed mechanism are respectively arranged symmetrically with respect to the symmetry plane .

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