JP2003094268A - Machine tool having freely rotatable spindle head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool making a spindle head and a workpiece relatively freely rotatable around the horizontal and vertical axes and finishing a big and long bent working surface of a workpiece with high surface accuracy. SOLUTION: A base in which rectangular penetration space 15 is formed is vertically provided opposite to a work table 14 on which a workpiece W is mounted. A slide 20 in which a rectangular penetration space 23 is formed, is installed on the base by guide rails 17a and b laid above and below the penetration space 15 so as to drive in the direction of the X axis. An elevating platform 30 in which a rectangular penetration passage is formed, is installed on a slide with guide rails laid on both sides of the penetration space so as to drive in the direction of the Y axis. A tilt table 35 is supported by a vertical girder extended in the vertical direction between both sides of the penetration passage so as to be rotationally driven around the A axis parallel to the X axis. A spindle head 55 installed movably on the tilt table is driven to move forward/backward to the work table. A spindle axially supported by the spindle head is rotationally driven, to thereby machine the workpiece with a tool T mounted in the tip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool for finishing a large and long curved machined surface of a workpiece with high surface accuracy.

[0002]

2. Description of the Related Art Molds for molding automobile bumpers and the like have large and long concave surfaces with both longitudinal and vertical ends bent, and it is necessary to finish the concave surfaces with extremely high surface accuracy. is there. Conventionally, when machining such a concave surface, the mold is placed and fixed on the table of a large machining center, and the tool axis is oriented in the direction of the normal of the concave surface. An angle head with matching angles is attached to the spindle head for processing.

[0003]

However, for example, in a metal mold for a bumper of an automobile, the left and right and the upper and lower concave surfaces have different normal directions in four directions. Therefore, the angle head is processed four times in order to process each concave surface. It had to be replaced, and it took time and effort to attach and detach and adjust the angle head. Furthermore, the attachment / detachment of the angle head causes a minute step on the machined surface, and in order to remove this step and obtain high surface accuracy, a super-skilled worker must hand polish the same die for several weeks. There has been a problem that the operator is forced to do the same work for a long time and the cost becomes high.

The present invention has been made in order to solve the above-mentioned conventional problems, and the spindle head and the workpiece can be relatively rotatable about a horizontal axis and a vertical axis with a simple structure, and the method of the workpiece can be used. A concave surface having different line directions can be machined with high surface accuracy by aligning the tool axis with the normal direction.

[0005]

In order to solve the above-mentioned problems, a structural feature of the present invention as set forth in claim 1 is that a workpiece is placed on a base having a rectangular through space formed in a central portion thereof. The work table is vertically opposed to the work table, and the guide rails are horizontally extended to the transverse girders extending on both upper and lower sides of the through space of the base, and the rectangular through space is formed in the central portion. The mounted slide is mounted on the base so as to be movable in the X-axis direction by the upper and lower guide rails, is drivingly connected to a servomotor, and is guided to vertical girder portions extending to the left and right sides of the through space of the slide. A rail vertically extends, and an elevating table having a rectangular through path formed in a central portion is mounted on the slide so as to be movable in the Y-axis direction by the left and right guide rails, and is drivingly connected to a servo motor. Extends to the left and right sides of the elevator passage A tilt table is rotatably supported on the girder portion about an A axis parallel to the X axis and drivingly connected to a servo motor, and a spindle head can be moved back and forth in the Z axis direction toward the work table on the tilt table. It is mounted and drive-connected to a servomotor, and the main spindle head is rotatably driven by the motor to support a main spindle on which a tool is detachably mounted.

According to a second aspect of the present invention, there is provided a machine tool having the rotatable spindle head according to the first aspect, in which the turntable is provided on the tilt table around the B axis perpendicular to the A axis. Is rotatably supported on the turntable and is mounted on the turntable so as to be movable back and forth in the Z-axis direction.

According to a third aspect of the present invention, there is provided a machine tool having the rotatable spindle head according to the first aspect, wherein a turntable is rotated on the work table about a vertical B axis. That is, it was freely supported and drive-connected to the servo motor.

According to a fourth aspect of the present invention, there is provided a feature that a base having a rectangular through space formed in a central portion is vertically erected facing a work table on which a workpiece is placed.
Guide rails are horizontally extended in transverse girders extending on both upper and lower sides of the through space of the base, and a slide having a rectangular through space formed in a central portion is provided on the base by the upper and lower guide rails. It is mounted so as to be movable in the X-axis direction and is drivingly connected to a servomotor, and guide rails are vertically extended to vertical girder portions extending to the left and right sides of the through space of the slide, and a rectangular penetration is provided in a central portion. A lift table having a path formed therein is mounted on the slide so as to be movable in the Y-axis direction by the left and right guide rails, and is drivingly connected to a servo motor. Rotatably supported about an axis and drivingly connected to a servomotor, and a spindle head mounted on the turntable so as to advance and retreat in the Z-axis direction toward the worktable and drivingly connected to the servomotor,
A spindle is rotatably driven by a motor and a tool is detachably mounted on the tip of the spindle head.

According to a fifth aspect of the present invention, there is provided a machine tool comprising the rotatable spindle head according to the fourth aspect, wherein a tilt table is provided on the work table around an A axis parallel to the X axis. It is rotatably supported by the motor and is drivingly connected to the servo motor.

[0010]

In the invention according to claim 1 configured as described above, the base having the rectangular penetrating space formed in the central portion is vertically opposed to the work table on which the workpiece is placed. The slide with the rectangular through space formed in the center is mounted on the base with guide rails extending up and down both sides of the through space and driven in the horizontal X-axis direction by the servo motor. The elevator with the rectangular through-passage formed in the part is mounted on the slide with the guide rails extending on both the left and right sides of the through-space, and is driven in the vertical Y-axis direction by the servo motor, and The tilt table is supported on the vertical girders that extend in the vertical direction on both sides, and the main spindle head mounted movably on the tilt table is servo-driven by the servomotor to rotate around the A axis parallel to the X axis. Motor The tilt table is moved by moving the tilt table toward and away from the table in the Z-axis direction and rotating the spindle supported by the spindle head by the motor to drive the workpiece with the tool attached to the tip. The axis of the tool can be oriented in the direction of the normal to the upper and lower concave surfaces of the workpiece, and each surface can be finished with high surface accuracy without steps without attaching or detaching the tool. As a result, it is possible to drastically reduce or eliminate the hand-polishing time by the super-skilled person, and it is possible to reduce the labor of the operator and the manufacturing cost.

In the invention according to claim 2 configured as described above, in the machine tool having the rotatable spindle head according to claim 1, the tilt table is supported by the tilt table, and the servo motor A is used. Since the spindle head is mounted on the turntable so that it can be moved back and forth in the Z-axis direction toward the worktable, it can be rotated about the B-axis that is perpendicular to the axis. In addition to the top and bottom concave surfaces, it can be oriented in the normal direction of the left and right concave surfaces, and each surface can be finished with high surface accuracy without steps without attaching or detaching tools.

According to a third aspect of the present invention configured as described above, in the machine tool having the rotatable spindle head according to the first aspect, a turntable is supported on the work table by a servomotor. Since it is rotatable about the vertical B axis, the axis of the tool can be oriented relatively to the normal to the left and right concave surfaces of the workpiece by rotating the turntable, and each surface can be stepped without attaching or detaching the tool. It has become possible to finish with high surface accuracy.

In the invention according to claim 4 configured as described above, a base having a rectangular through space formed in a central portion is vertically erected facing a work table on which a workpiece is placed. , A slide having a rectangular through space formed in the central part is mounted on a base with guide rails extending vertically on both sides of the through space, and is driven in the horizontal X-axis direction by a servo motor to form a rectangular shape in the central part. A lift table with a through-passage is mounted on a slide with guide rails that extend to the left and right sides of the through-space, and is driven in the vertical Y-axis direction by a servo motor, and the turntable is supported on the lift within the through-passage. Then, the servo motor rotates about the vertical B-axis, and the spindle head movably mounted on the turntable is moved back and forth in the Z-axis direction toward the work table by the servo motor to move the spindle to the spindle. Since the main shaft supported on the blade is driven to rotate by the motor and the work piece is machined with the tool attached to the tip, the axis of the tool is moved to the normal direction of the left and right concave surfaces of the work piece by turning the turntable. Can be directed,
It became possible to finish each surface with high surface accuracy without steps without attaching or detaching tools. As a result, it is possible to drastically reduce or eliminate the hand-polishing time by the super-skilled person, and it is possible to reduce the labor of the operator and the manufacturing cost.

In the invention according to claim 5 configured as described above, in the machine tool having the rotatable spindle head according to claim 4, the tilt table is supported on the work table and the X-axis is generated by the servomotor. Since it is rotatable about the A axis parallel to the axis, the axis of the tool can be relatively oriented by the rotation of the tilt table in the normal direction of the vertical concave and vertical surfaces of the workpiece, and each surface can be attached without attaching or detaching the tool. It has become possible to finish with high surface accuracy without steps.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3, 11 is a base, which is erected vertically on the bottom surface of a pit 13 dug in a floor 12.
The work table 14 is installed on the floor 12 and on which the work W is placed and fixed. A rectangular through space 15 is formed in the central portion of the base 11, and the through space 15
Girders 16a, 16b of the base 11 extending on both the upper and lower sides of the
Guide rails 17a and 17b are horizontally extended on the front surface of the. Vertically extending portions 21a and 21b of the slide 20
The support portions 18 fixed to the four rear surfaces of the guide rail 1
The slide 20 is supported by 7a and 17b and is attached to the base 11 by X.
It is mounted so that it can move in the axial direction. A table portion 22 is formed on the slide 20 so as to project forward, and a through space 23 is formed in a horizontal direction in a central portion of the slide 20 so as to penetrate the table portion 22. Ball screws 24a and 24b are attached to the horizontal rails 16a and 16b of the base 11 and guide rails 17a and 1b.
It is rotatably supported in parallel on the outside of 7b and is rotationally driven by servomotors 25a and 25b. Ball screw 24
a and 24b are respectively screwed with feed nuts 19a and 19b fixed to the back surface of the slide 20, and the slide 20 is connected to servo motors 25a and 25b so as to be driven in the X-axis direction.

Left and right guide rails 27a and 27b are vertically extended on the front surfaces of the vertical girder portions 26a and 26b extending on both the left and right sides of the through space 23 of the slide 20, and the lift table 30 is mounted on the guide rails 27a and 27b. Flange part 31 back side 4
A lift 52 is mounted on a slide 20 so as to be movable in the Y-axis direction, with a bearing 52 fixed at a position.
A housing portion 32 is projectingly provided behind the flange portion 31 of the elevating table 30 and extends into the through space 23 of the slide 20 and the through space 15 of the base 11, and in the central portion of the elevating table 30,
A through passage 33 is horizontally formed through the flange portion 31 and the housing portion 32. Vertical girder part 26 of slide 20
A concave groove is vertically formed on the inner surface of the a, 26b facing the through space 23, and the ball screw 28a,
28b is housed and rotatably supported. Servo motors 29a, 29 fixed to the upper surface of the base 22 of the slide 20 are rotatably connected to the ball screws 28a, 28b,
The ball screws 28a and 28b are screwed into the feed nuts 53a and 53b fixed to the side surface of the housing 32 in the concave groove, whereby the lift table 30 is drivingly connected to the servomotors 29a and 29 and moved in the Y-axis direction. It

The vertical girders 34a and 34b extending to both the left and right sides of the through-passage 33 of the lift 30 have pivot tables 36a and 36b provided on both sides of the tilt table 35 so as to rotate around the A axis parallel to the X axis. It is rotatably supported. A worm wheel 38 that meshes with a worm 37 rotatably supported by the housing 32 is fixed to the pivot 36a, and a servomotor 39 fixed to the housing 32 is rotatably connected to the worm 37. 35 is a servo motor 3
9 is driven and connected to rotate about the A axis.

A turntable 40 is rotatably supported on the upper surface of the tilt table 35 about a B axis intersecting the A axis at a right angle. A worm wheel 43 meshing with a worm 42 rotatably supported on the tilt table 35 is fixed to a drive shaft 41 fixed to the lower surface of the turntable 40, and a servomotor 44 fixed to the tilt table 35 is attached to the worm 42. The turntable 40 is rotationally connected, and the turntable 40 is drivingly connected to the servomotor 44 by the dust and is rotated about the B axis.

On the upper surface of the turntable 40, the through passage 3
3, a base 45 extending into the through space 23 and the through space 15 is fixed, and a pair of guide rails 46 is provided on the upper surface of the base 45 so as to extend in the front-rear direction.
The bearing parts 48 fixed to the lower surface of the headstock 47 are supported on the worktable 14 on the base 45.
It is mounted so as to be movable in the Z-axis direction toward. Servo motor 49 fixed to the rear end of base 45
Is rotatably coupled to a ball screw 50 which is rotatably supported by the ball screw 50, and the ball screw 50 is screwed into a feed nut 51 fixed to the headstock 47.
9 is driven and connected, and moved in the Z-axis direction.

A housing 56 of a spindle head 55 is fixed in front of the headstock 47 with an extension member 54 interposed therebetween, and as shown in FIG. 4, a spindle 57 extending in the Z axis direction is a bearing in the housing 56. It is rotatably supported by 58. The axis of the main shaft 57 is arranged so as to intersect with the A axis and the B axis so that the displacement of the tip of the main shaft 57 when the main shaft 57 is rotated around the A axis and the B axis becomes small. Reference numeral 59 is a built-in motor that rotationally drives the main shaft 57.
The rotor 60 is fixed to the housing 60, and the exciting coil 61 is fixed to the housing 56 so as to surround the rotor 60. The taper hole 62 formed at the tip of the main shaft 57 is fitted with the taper shaft of the tool holder 63 in which the tool T is mounted, and the tool holder 63 is detachably attached to the main shaft 57 by the tool clamp device 64 installed in the main shaft 57. It is designed to be attached to. A tool magazine 65 is indexably and rotatably supported on a support stand erected on the floor 12 so that various tool T
The tool holders 63 attached to the tool holders 63 are detachably housed in the tool holding portions provided on the outer periphery of the tool magazine 65, and the selected tool holders 63 are attached to the spindle 57.

In the first embodiment constructed as described above, the workpiece W is mounted on the work table 14, and the spindle 57 is rotationally driven by the built-in motor 59.
The servomotors 25a and 25b move the slide 20 in the X-axis direction, the servomotors 29a and 29b move the lift table 30 in the Y-axis direction, the servomotor 49 moves the headstock 47 in the Z-axis direction, and the spindle head. The tool T mounted on the tip of the main shaft 57 supported by 55 is moved along the inner surface 66 of the workpiece W to be machined to move the inner surface 6 to the inner surface 6.
6 is finished. Then, when the tool T processes the upper inner surface 67 of the inner surface 66, the tilt table 35 is moved upward by the servo motor 39 so that the spindle 57 and thus the axis of the tool T are oriented in the normal direction of the upper inner surface 67. When the lower inner surface 68 is rotated and the lower inner surface 68 is machined, the axis line of the tool T is
The tilt table 35 is rotated downward by the servomotor 39 so as to face the normal direction of No. 8, and when the right inner side surface 69 is machined, the axis of the tool T faces the normal direction of the right inner side surface 69. When the turntable 40 is rotated counterclockwise in FIG. 3 by the servomotor 44 and the left inner side surface 70 is machined, the turntable 40 is moved so that the axis of the tool T faces the normal direction of the left inner side surface 70. Servo motor 44
Since the tool T is rotated in a clockwise direction by the above, the inner surface 66 of the workpiece W is finished with high surface accuracy without being detached and attached, without any step.

When exchanging the tool T, the tilt table 35 is arranged so that the main shaft 57 is oriented in the direction perpendicular to the X and Y axes.
The turntable 40 is positioned by the servomotors 39 and 44, and the slide 20 is arranged so that the spindle 57 is aligned with the tool magazine 65 at the tool exchange position for exchanging tools.
And the lifting table 30 includes the servo motors 25a, 25b and 29.
Positioned by a and 29b. At the tool exchange position, the headstock 47 is moved forward by the servomotor 49 to move the headstock 57.
The tool holder 63 attached to the tool magazine 65 is returned to the empty tool holding portion of the tool magazine 65, and the tool clamp device 64 retracts when the tool holder 63 is opened. Tool holder 63
When the tool holder is indexed to the tool replacement position, the tool holder 63 is used next, the tool holder 63 to be used next is fitted into the taper hole 62, and is attached to the spindle 57 by the tool clamp device 64.

Next, a second embodiment of the present invention will be described. In the second embodiment, the work table is mounted on the floor so as to be movable in the X-axis direction, and the tilt table 3 is used.
5 is the same as that of the first embodiment except that the turntable 40 supported on 5 is removed, the base 45 is directly fixed on the tilt table 35, and the turntable is supported on the work table. Are denoted by the same reference numerals and detailed description thereof will be omitted.

Guide rails 75a and 75b are fixed on a plate 74 installed on the floor, and the guide rail 75
The support portions 77 fixed to four positions on the back surface of the work table 76 are supported by a and 75b, and the work table 76 is mounted on the floor so as to be movable in the X-axis direction. Plate 7
4 has a ball screw 78 between the guide rails 75a and 75b.
Is rotatably supported, and the ball screw 78 has a plate 7
4 is rotatably connected to the servo motor 79, and the ball screw 78 is screwed into the feed nut fixed to the back surface of the work table 76, so that the work table 76 moves to the servo motor 7.
It is connected to 9 and moved in the X-axis direction. As a result, a part of the movement of the slide 20 in the X-axis direction is partially transferred to the work table 76.
Since the tool T and the workpiece W can be relatively moved in the X-axis direction by being shared by the X-axis movement of the slide 20,
The moving stroke of can be shortened and the whole machine can be made compact.

A turntable 80 is rotatably supported on the upper surface of the work table 76 about a vertical B axis.
A worm 8 rotatably supported by a work table 76 is mounted on a drive shaft 81 fixed to the lower surface of the turntable 80.
The worm wheel 83 meshing with 2 is fixed, the servo motor 84 fixed to the work table 76 is rotationally connected to the worm 82, and the turntable 80 is drivingly connected to the servo motor 84 and rotated about the B axis. A jig plate 85 for mounting and fixing the work W is fixed on the turntable 80.

In the second embodiment constructed as described above, the workpiece W is mounted on the jig plate 85, and the spindle 57 is driven to rotate by the built-in motor 59. The servomotors 25a and 25b move the slide 20 in the X-axis direction, the servomotors 29a and 29b move the lift table 30 in the Y-axis direction, the servomotor 49 moves the headstock 47 in the Z-axis direction, and the spindle head. The tool T mounted on the tip of the main shaft 57 supported by the workpiece 55 is the work W.
Being moved along the inner surface 66 to be machined of the inner surface 66
To finish. Then, when the tool T processes the upper inner surface 67 of the inner surface 66, the tilt table 35 is moved upward by the servo motor 39 so that the spindle 57 and thus the axis of the tool T are oriented in the normal direction of the upper inner surface 67. When the lower inner surface 68 is rotated and the lower inner surface 68 is machined, the axis of the tool T is
The tilt table 35 is turned downward by the servomotor 39 so as to face the normal direction of the right inner side surface 69, and when machining the right inner side surface 69, the axis of the tool T is turned so as to face the normal direction of the right inner side surface 69. The table 80 is rotated clockwise by the servomotor 84 in FIG. 5, and when the left inner side surface 70 is machined, the turntable 80 is rotated by the servomotor so that the axis of the tool T faces the normal direction of the left inner side surface 70. Since the tool T is rotated in the counterclockwise direction by 84, the tool T is not attached and detached, and the inner surface 66 of the workpiece W is finished without steps and with high surface accuracy. If the stroke is insufficient only by moving the slide 20 in the X-axis direction, the work table 76 is moved in the X-axis direction by the servomotor 79 so that the unprocessed portion of the workpiece W faces the tool T and finishes as described above. Continue processing.

In the above embodiment, the tilt table is rotatably supported on the lift table, but the tilt table is rotatably supported on the work table so that the tilt table is driven to rotate about the A axis. It is connected to a servomotor, a turntable is rotatably supported on a lift, and it is connected to a servomotor so that it can be rotated about the B-axis, and the headstock is moved back and forth toward the workpiece W on the turntable. It may be mounted as much as possible.

When it is desired to rotate the tool T at a high speed, the main body of the speed increasing spindle unit is positioned and fixed at the tip of the housing 56 of the main shaft head 55, and the high speed spindle of the speed increasing spindle unit is fixed to the main shaft 57 via the speed increasing mechanism. It may be rotationally connected.

[Brief description of drawings]

FIG. 1 is a front view of a machine tool including a rotatable spindle head according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a side view of a spindle head.

FIG. 5 is a side view showing a second embodiment.

FIG. 6 is a plan view of FIG.

[Explanation of symbols]

11 ... Base, 12 ... Floor, 14 ... Work table, 15
... Penetration space, 16a, 16b ... Transverse part, 17a, 1
7b, 27a, 27b, 46, 75a, 75b ... Guide rail, 20 ... Slide, 23 ... Penetration space, 24a, 2
4b, 28a, 28b, 50, 78 ... Ball screw, 25
a, 25b, 29a, 29b, 39, 44, 49, 7
9, 84 ... Servo motor, 30 ... Elevating table, 33 ... Through passage, 35 ... Tilt table, 40, 80 ... Turntable, 47 ... Headstock, 55 ... Spindle head, 57 ... Spindle, 5
9 ... Built-in motor, T ... Tool, W ... Workpiece.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3C048 AA01 BB01 BB03 BB12 BB20                       BC02 BC03 CC04 DD10 DD17                       EE00

Claims (5)

[Claims] 1. A base in which a rectangular through space is formed in a central portion is vertically erected so as to face a work table on which a workpiece is placed, and the base extends above and below both sides of the through space. A guide rail is horizontally extended in the existing cross beam part, and a slide having a rectangular through space formed in the central part is mounted on the base so as to be movable in the X-axis direction by the upper and lower guide rails and servo-operated. A drive rail is drivingly connected to the motor, guide rails are vertically extended on vertical girders extending on both left and right sides of the through space of the slide, and a lift table having a rectangular through passage is formed in the central portion of the slide. Y by the left and right guide rails
It is mounted so as to be movable in the axial direction and drive-coupled to a servo motor, and a tilt table is rotatably provided around an A-axis parallel to the X-axis on the longitudinal girders extending on both left and right sides of the passage of the elevator. It is supported and drivingly connected to a servo motor, and a spindle head is mounted on the tilt table so as to be movable back and forth in the Z-axis direction toward the work table, drivingly connected to the servo motor, and rotationally driven by the motor to the spindle head. A machine tool having a rotatable spindle head, characterized in that a spindle, on which a tool is detachably mounted, is supported at its tip. 2. A machine tool having a rotatable spindle head according to claim 1, wherein a tilt table is rotatably supported on the tilt table around a B axis perpendicular to the A axis, and the tilt table is used as a servo motor. A machine tool provided with a rotatable spindle head, which is drive-connected and mounted on the turntable so as to be movable back and forth in the Z-axis direction. 3. A machine tool having a rotatable spindle head according to claim 1, wherein a turntable is rotatably supported on the worktable about a vertical B-axis and drive-connected to a servomotor. A machine tool equipped with a rotatable spindle head. 4. A base having a rectangular penetrating space formed in a central portion is vertically erected so as to face a work table on which a workpiece is placed, and extends vertically above and below the penetrating space of the base. A guide rail is horizontally extended in the existing cross beam part, and a slide having a rectangular through space formed in the central part is mounted on the base so as to be movable in the X-axis direction by the upper and lower guide rails and servo-operated. A drive rail is drivingly connected to the motor, guide rails are vertically extended on vertical girders extending on both left and right sides of the through space of the slide, and a lift table having a rectangular through passage is formed in the central portion of the slide. Y by the left and right guide rails
The turntable is mounted so as to be movable in the axial direction and drive-connected to the servomotor, and the turntable is rotatably supported around the vertical B-axis in the through-passage and drive-connected to the servomotor. A spindle head is mounted on a turntable so as to be able to move back and forth in the Z-axis direction toward the work table, and is drivingly connected to a servomotor. The spindle head is rotationally driven by the motor and a tool is detachably attached to the tip. A machine tool equipped with a rotatable spindle head characterized by supporting a spindle. 5. A machine tool comprising a rotatable spindle head according to claim 4, wherein a tilt table is rotatably supported on the work table about an A axis parallel to the X axis, and the tilt table is used as a servo motor. A machine tool equipped with a rotatable spindle head characterized by being drive-connected.