JPH0283101A - Nc lathe - Google Patents

Abstract

PURPOSE:To prevent the interference between outer diameter machining tools by using a single and X, Y, Z-axis shift type tool rest. CONSTITUTION:A raw material held by the chuck or a main spindle is rotated together with the main spindle. A tool rest 60 is moved in the X-axis and Y-axis directions by the X-axis direction shift of a lateral feed bar 40 and the Y-axis direction shift of a vertical feed bar 50, and a tool to be used is selected among tools 61-68. The tool rest 60 is then shifted in the X-axis, Y-axis, and Z-axis directions by the Z-axis direction shift of a longitudinal feed bar 30, the X-axis direction shift of the lateral feed bar 40 and the Y-axis direction shift of the vertical feed bar 50, the selected tool is brought into contact with the raw material at the desired depth of cut, the tool in contact with the tool rest, i.e., the raw material, is fed in the Z-axis direction by the Z-axis direction shift of the longitudinal feed bar 30, and the outer diameter cut machining of the raw material is performed. The tool rest 60 has a circular structure and high rigidity, thus cut machining with good precision can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an NC lathe for a machine tool, and particularly to an NC lathe in which a tool rest is moved in three axes.

(Prior art) Conventionally, as an NC lathe, for example, JP-A-62-26480
7, Japanese Patent Application Laid-open No. 63-74502, and the like are known.

The NC lathe disclosed in Japanese Patent Application Laid-open No. 62-264807 has a main shaft that grips and rotates a material, a guide bush provided on the center line of the main shaft in front of the main shaft, and a plurality of guide bushes that support the guide bush. a column for movably holding a tool; a first guideway provided on the surface of the column opposite to the main axis and parallel to a direction (horizontal) orthogonal to the main axis centerline (horizontal); A first moving table that moves while being supported and guided by a first guide path, and a direction (
a second guide path provided in parallel to the main axis (perpendicular), a second moving table that moves while being supported and guided by the second guide path, and a second moving table provided on the second moving table and located above the spindle center line and mutually connected to each other. Holds a tool that is parallel and facing downward, and a tool that is located at approximately the same height as the spindle centerline, parallel to each other, and facing inward on both sides of the spindle centerline. It consists of a tool holder or a tool holder that is provided on the second movable table and holds a tool that is arranged approximately radially with respect to the spindle centerline.

In this NC lathe, one tool holder holds multiple tools in the downward and left-right directions.
Idle time when selecting tools can be reduced.

The NC lathe disclosed in Japanese Patent Application Laid-Open No. 63-74502 is
A headstock that rotatably supports the spindle, a longitudinal feed that is located in front of this headstock and moves in the direction (horizontally) of the center line of the spindle, and a longitudinal feed that is located on this longitudinal feed and is orthogonal to the center line of the spindle. A first tool rest that moves in the direction (horizontally) and holds tools facing each other across the spindle center line, and a first tool rest that is on the same longitudinal feed stand and is orthogonal to the spindle center line and in a different direction from the first tool rest. a second tool rest that moves in a direction toward and away from the main shaft (vertical) and a direction perpendicular to both the direction and the main shaft direction (horizontal) and holds a plurality of tools; and a second tool rest provided on the first tool rest. a hole-machining tool rest arranged opposite to the headstock;
and a numerical control device that controls movement in each axis direction.

In this NC lathe, two independent tool rests can be used in conjunction with each other, so it is possible to perform simultaneous machining with two tools, or while machining with one tool, the next tool can be brought close to the workpiece and wait. idle time can be shortened.

(Problems to be Solved by the Invention) However, the conventional NC lathe has the following problems.

That is, in the NC lathe disclosed in Japanese Patent Application Laid-Open No. 62-264807, (1) the tool holder is single and is arranged only above and on the left and right sides of the main spindle, or only in an arc shape above the main spindle; Therefore, it is not possible to increase the number of tools that can be attached to the tool holder.

■ The tool holder is attached to the column that ultimately supports the guide bushing via the second moving table and the first moving table, and the distance between the tool holder and the guide bushing in the direction of the spindle centerline is narrow. It is difficult to attach a longitudinal holder, milling unit, etc. to the tool holder for recess machining at the back of the polling hole, or for machining holes on the outer diameter surface.

In addition, in the NC lathe disclosed in Japanese Patent Application Laid-open No. 63-74502, ■ The first tool rest and the second tool rest move independently, so the tool fixed to the first tool rest and the second tool rest There is a possibility that tools fixed to the
Programs also become more complex.

■ When machining is performed using a tool fixed to the second tool post after machining with a tool fixed to the first tool post is completed, control is required to move the tool fixed to the first tool post back from the workpiece. At the same time, control for moving the tool fixed to the second tool rest toward the workpiece must be performed simultaneously, making the control complicated.

■ Since the first tool post cannot be moved vertically, when installing a tool on the first tool post, it is necessary to make small adjustments using spacers, etc. to align the centers of the workpiece and the tool. It takes time.

■ Since the hole machining tool rest is fixed to the first tool rest, it is not possible to perform simultaneous machining using the hole machining tool and the tool fixed to the first tool rest. Since both the tool rest and the tool rest move in the direction of the center line of the spindle as the longitudinal feed moves, it is actually impossible to perform simultaneous machining with a hole machining tool and a tool fixed to the second tool rest.

The present invention was constructed in view of the above-mentioned problems, and an object of the present invention is to provide an NC lathe that is equipped with a large number of different types of tools, has a small number of control axes, and has high productivity.

(Means for Solving the Problems) The above object of the present invention is to provide a headstock that rotatably supports a main spindle, and a longitudinal feed that is located in front of the headstock and moves in the Z-axis direction, which is the centerline direction of the main spindle. a horizontal feed table which is located on this longitudinal feed table and moves in the X-axis direction which is orthogonal to the Z-axis and moves toward and away from the spindle center line; a vertical feed table that moves in the Y-axis direction, which is a direction perpendicular to the X-axis and the X-axis; a turret that holds a plurality of tools attached to the vertical feed table; and a numerical control device that controls movement in each axis direction. or by an NC lathe consisting of a headstock that rotatably supports the main spindle, and a Z-axis located in front of this headstock and in the direction of the center line of the main spindle.
X, which is the direction perpendicular to the axis and moving toward and away from the center line of the main axis
A horizontal feed table that moves in the axial direction; a longitudinal feed table that is on the horizontal feed table and moves in the Z-axis direction; and a longitudinal feed table that is on the longitudinal feed table and moves in a direction perpendicular to the Z-axis and the X-axis. This is achieved by an NC lathe consisting of a vertical feed table that moves in the Y-axis direction, a tool rest that holds a plurality of tools attached to the vertical feed table, and a numerical control device that controls movement in each axis direction.

In a preferred embodiment of the present invention, the tool rest has an annular structure or an annular structure vertically elongated in the vertical direction. Further, the tool rest can also have an annular upper half or lower half structure. Further, one tool rest is arranged in the direction approaching the main shaft in the X-axis direction and one in the direction away from the main shaft, and a rotation drive device is provided for rotating the tool rest around an axis extending in the Z-axis direction. Alternatively, the tool rest is arranged in a direction approaching the main axis in the X-axis direction, and a rotational drive device that rotates the tool rest around an axis extending in the X-axis direction is provided, and the tool rest is perpendicular to the X-axis. It is also possible to attach tools to multiple planes forming a cross-section of the turret cut in a vertical plane.

In another preferred embodiment of the present invention, a turret head that moves in the Z-axis direction is provided on the opposite side of the main shaft with respect to the tool rest of the lathe.

In yet another preferred embodiment of the present invention, a turret head that moves in the Z-axis direction and the X-axis direction, or the Z-axis direction and the Y-axis direction is provided on the opposite side of the main shaft with respect to the tool rest of the lathe. There is.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of an NC lathe according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a sectional view taken along line AA in FIG. 1. ! FIG. 4 is a cross-sectional view taken along line CC in FIG. 1.

In FIG. 1, 10 is a bed forming the base of the NC lathe, and a headstock 21 that rotatably supports a main shaft 20 by a bearing (not shown) is fixed to the upper part of the rear part 10a of the bed 10. .

The rotational drive mechanism for the main shaft has a well-known structure, so it will be briefly explained. That is, the main spindle 20 is rotationally driven by a main spindle motor 22 provided at the rear end of the headstock 21. Also, main shaft 2
0' is hollow in order to insert a bar material as a workpiece, and a chuck for gripping the workpiece is provided at its front end.

A guide path 11 extending in the Z-axis direction, that is, in the direction of the center line of the main shaft 20, is formed in the upper part of the front part 10f of the bed IO and in front of the headstock 21. are slidably arranged. In order to drive the longitudinal feed table 30 in the Z-axis direction, the guide path 1
A Z-axis path screw 32 is arranged parallel to the Z-axis.
A nut 33 fixed to the longitudinal feed base 30 is screwed into the transportation screw 32. Further, the Z transport line screw 32 has a Z
An axial motor 34 is connected. Therefore, when the Z-axis path screw 32 is rotationally driven by the Z-axis path remoter 34, the longitudinal feed table 30 slides along the guide path 11 via the nut 33 in the Z-axis direction.

A guide path 31 that is perpendicular to the Z-axis and extends in the horizontal direction is formed in the upper part of the longitudinal feed table 30, and a lateral feed table 40 is slidably disposed in this guide path. . The horizontal feed table 40 is moved in the X-axis direction, that is, the guide path 31
An X-axis feed screw 42 is disposed parallel to the guide path 31 in order to drive in the direction along the guide path 31, and a nut 43 fixed to the horizontal feed base 40 is screwed into this X-axis feed screw 42. are doing. Further, an X-axis feed motor 44 is connected to the X-axis feed screw 42 . Therefore, the X-axis feed motor 4
4 rotates the X-axis feed screw 42, the horizontal feed table 40 moves along the guide path 31 via the nut 43
Slide in the axial direction.

Furthermore, a column-shaped guide path 41 that is perpendicular to the center line of the main shaft 20 and extends in the vertical direction is formed in the upper part of the horizontal feed table 40, and a vertical feed table 50 can freely slide on this guide path 41. It is located in

In order to drive the vertical feed table 50 in the Y-axis direction, that is, in the direction along the guide path 41, a Y transport screw 52 is disposed parallel to the direct guide path 41. A nut 53 fixed to the vertical feed table 50 is screwed into the nut 53 . Further, a Y-axis motor 54b is connected to the Y-transport screw 52. Therefore, the Y transport motor 5
When the Y transport screw 52 is rotationally driven by 4, the lower hill feed table 50 moves along the guide path 41 via the nut 53.
Slide in the axial direction.

A tool rest 60 having an annular structure a extending in the X-axis direction and in a direction approaching the main shaft 20 is fixed to the side surface of the vertical feed table 50. The L arm 60u1 and the lower arm 601 of the tool rest 60 each hold three tools 61 to 63, and 64 to 66, and the side arms 60°603□ each hold a tool 67 and 68.

A guide path 12 is formed in the upper part of the bed 10f and extends in the Z-axis direction in parallel with the guide path 11.
2, a hole machining tool stand 70 is slidably disposed. In order to drive the hole machining tool stand in the Z-axis direction, a Z transport line screw 72 is arranged parallel to the guide path 12,
A nut 73 fixed to the hole machining tool stand 70 is screwed into this Z-axis guide screw 72. Further, a Z-axis travel motor 74 is connected to the Z-axis travel screw 72 .

Therefore, the Z-axis travel screw 72 is rotated by the Z-axis travel motor 74.
When the hole machining tool stand 70 is rotated, the nut 73
It slides in the Z-axis direction along the guide path 12 via.

A shaft 81 extending in the X-axis direction at the same height as the center line of the main shaft 20
is rotatably supported on the hole machining tool rest 70, and the shaft 81 is connected to the hole machining tool rest 70. 1, and is rotationally driven by a motor 90 fixed to the tool stand 70 via a gear device (not shown) disposed inside the tool stand 70. A flat regular octagonal prism-shaped turret head 80 is fixed to the end of the shaft 81 on the longitudinal feed table 30 side, and each of the eight flat side surfaces of the turret head 8o holds hole machining tools 82 to 89. Here, the hole machining tools 82 to 89 are positioned such that their center lines are within a vertical plane that includes the center line of the main shaft.

It should be noted that the numerical control device used in the present invention is a well-known device, so a description thereof will not be provided.

Next, the operation of the NC lathe having the above-described configuration of the present invention will be explained.

The material gripped by the chuck of the main shaft 20 rotates together with the main shaft. Then, the movement of the horizontal feed table 40 in the X-axis direction,
By moving the vertical feed stand 50 in the Y-axis direction, the tool rest 60
is moved in the X and Y axis directions to select the tool to be used from tools 61 to 68, and then the longitudinal feed table 30 is moved in the Z axis direction and the horizontal feed table 40 is moved in the X axis direction. , by moving the vertical feed table 50 in the Y-axis direction, the tool rest 60 is moved in the three-axis directions of X, Y, and Z, and the selected tool is brought into contact with the material at the desired depth of cut, and then By moving the longitudinal feed table 30 in the Z-axis direction, cutting the outer diameter of the material is performed while feeding the tool rest 60 and the tool in contact with the material in the Z-axis direction. The tool post 60 has an annular structure and is highly rigid, so that highly accurate cutting is possible.

Hole machining of the material is performed by moving the hole machining tool stand 70 in the Z-axis direction using the hole machining tools 82 to 89. Selection of the hole machining tool is performed by rotating the turret head 80 around the shaft 81 and indexing the desired hole machining tool.

Since the feed carriage 30, 40, 50 that supports the tool rest 60 and the hole machining tool stand 70 that supports the turret head 80 move independently, the outer diameter machining tool and the hole machining tool can be brought close to the material at the same time. This makes it possible to cut the outer diameter of the material and drill holes at the same time.

As shown in FIG. 5, by attaching the longitudinal holder 100 to the tool rest 60, it is possible to machine the recess at the back of the polling hole, and by attaching the milling unit 101, it is possible to machine the hole on the outer diameter surface of the material. Also, knife rest 60
By attaching the milling unit 102 to the side surface of the material, holes can be formed at locations other than the center position of the end surface of the material.

In FIG. 1, the annular tool rest 60 has a vertically elongated shape in the X-axis direction, but the annular tool rest 60 may have a vertically elongated shape in the Y-axis direction as shown in FIG. 6A. By forming the tool post into a vertically elongated shape in the Y-axis direction, that is, in the vertical direction, the rigidity of the tool post is further increased, and higher cutting accuracy can be obtained. FIGS. 6B and 6C show still another example of a vertically elongated annular tool rest. In the illustrated tool rest 60', in addition to the outside diameter machining tools 61' to 67', a rotary tool 101' in the Y-axis direction and a rotary tool 102' in the Z-axis direction are provided. '102' tool axis 101
a', 102a' are a gear G and three idle gears IG connected to the rotating shaft of the motor M by a belt Be;
It is configured to be rotationally driven by a motor M via tcz and IG. Belt Be, gear G1
Idle gear rG1, IG2, IG3, tool shaft 101a
', 102a', etc. are stored inside the tool rest 60'. According to this configuration, since the tool rest has a vertically elongated shape, the rigidity of the tool rest is increased and higher cutting accuracy is obtained, and since one drive motor is shared by a plurality of rotary tools, rotary tools can be compactly arranged on the tool rest, and cutting functions can be diversified without increasing the size of the tool rest.

In the above embodiment, the tool rest 60 has an annular structure, but
If disposal of chips is a problem, the tool rest 60 may have an annular upper or lower half structure. In this case, in order to facilitate the falling of chips, it is preferable to use an annular upper half. In addition, when the tool rest 60 has an annular upper half or lower half structure, the tool rest 6o
It is desirable to increase the cross-sectional dimension of to ensure rigidity. In the above embodiment, the turret head has an octagonal prism shape, but it goes without saying that other polygonal prism shapes can be used and the number of hole-machining tools can be increased or decreased.

The longitudinal feed table 30 may be arranged above the horizontal feed table 40. For example, if the sliding distance of the horizontal feed bar 40 is longer than the sliding distance of the longitudinal feed bar 30 (such as when the length of the tool rest 60 is increased and a large number of tools are attached), such a configuration is recommended. is preferable from the viewpoint of structural stability.

As shown in FIG. 7, it is rotatably supported by the vertical feed table 50a and rotated by a motor 110 fixed to the vertical feed table 50a via a gear device (not shown) disposed inside the vertical feed table 50a. A driven shaft 111 extending in the Z-axis direction is disposed, and two annular tool rests 60a and 60b extending in the direction of the X-axis toward the main shaft 20 and away from the main shaft 20 are fixed to the shaft 111. It's okay.

If the shaft 111 is rotated by the motor 110, either the tool rest 60a or 60b can be brought to the main shaft side. According to this configuration, more tools can be attached to the tool rest, and the tools can be mounted on the tool rest. The setup time for selection can be shortened.

Further, as shown in FIG. 8, the vertical feed table 50b is rotatably supported by the vertical feed table 50b, and is connected to the vertical feed table 50b via a gear device (not shown) disposed inside the vertical feed table 50b.
A shaft 121 extending in the X-axis direction that is rotationally driven by a motor 120 fixed to the shaft 121 is disposed, and an annular tool rest 60 that extends in the X-axis direction and in a direction approaching the main shaft 20 is disposed on the shaft 121.
c may be fixed and tools may be attached to the inner and outer peripheral surfaces of the tool rest 60c. With this configuration, the surface of the tool rest 60c facing the end surface of the material to be cut can be changed by rotating the motor 120. This configuration allows a large number and variety of tools to be used, such as tools for outer diameter machining of materials, tools for recess machining of polling milk odor, etc. Not only can tools be attached to the tool post, but the setup time for tool selection can be shortened.

Further, as shown in FIG. 9, a second longitudinal feed 130 is slidably disposed on the guide path 12, and
A hole machining tool stand 70a equipped with a turret head 80 is slidably disposed on a guide path 131 extending in the X-axis direction installed above, and the hole machining tool stand 70a is connected to an X-axis feed motor 132. Guided by an X-axis feed screw (not shown) arranged parallel to the guide path 131 and rotationally driven by an X-axis feed motor 132, and a nut (not shown) fixed to the hole machining tool stand 70a and screwed into the X-axis feed screw. It may also be driven along the path 131 in the X-axis direction. According to this configuration, the turret head 80 can move not only in the Z-axis direction but also in the X-axis direction, so that the turret head 80 can perform boring processing on the material. In addition, the hole machining tool stand 7
Similar effects can be obtained by configuring 0a to be movable in the Y-axis direction using the same means as the vertical feed table 50.

Although the present invention has been described in detail above, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made within the scope of the invention as set forth in the claims.

(Effects of the Invention) Since the tool rest is single and movable in three axes of x, y, and z axes, there is no fear of interference between tools for outer diameter machining.

On the other hand, since the tool post is mounted on a movable table that is separate and independent from the headstock, it can be used not only for tools for outside diameter machining, but also for recess machining of polling milk odor, tools for drilling holes on the outside diameter surface, etc. Can you attach tools to the turret? In addition, since the tool post can move in the Y-axis direction (vertical direction), it is possible to center the horizontal tool held by the side of the tool post and drift material using program control, making it easy to install the tool. .

In addition, since the tool rest has an annular structure, if the tool held by the annular upper arm and the tool held by the lower arm are used alternately for machining, the hot tool can be removed from the material after machining with the specified tool. Since the predetermined tool will inevitably retreat from the workpiece simply by performing control to advance it towards the workpiece, control is easy, and the annular structure increases the rigidity of the tool post and improves machining accuracy. Further, by forming the tool rest into an annular structure having a linear length in the vertical direction, the rigidity of the tool rest becomes higher and the machining accuracy is further improved. Incidentally, by making the tool rest an annular upper half or lower half, it becomes easier to dispose of chips, but in this case, it is desirable to increase the cross-sectional dimension of the tool rest to ensure rigidity.

In addition, two turrets that are driven to rotate around an axis extending in the Z-axis direction or a tool rest that is driven to rotate around an axis that extends in the X-axis direction are installed, so that more and more A wider variety of tools can be attached to the inner and outer peripheral surfaces of the tool rest, and setup time for tool selection can be shortened.

Furthermore, since the means for moving the hole machining tool rest and the means for moving the tool rest are separate, it is possible to simultaneously perform hole machining and machining of the outer circumferential surface of the material.

Furthermore, since the hole machining tool stand is movable in the Z-axis direction and the X-axis direction, or in the Z-axis direction and the Y-axis direction, it is possible to bore the material.

As described above, the present invention provides an NC lathe with a small number of controls and high productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an NC lathe according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. A cross-sectional view along the line, Figure 4 is C in Figure 1.
- It is a sectional view along line C. FIG. 5 is an enlarged perspective view of the tool rest. FIG. 6A is a perspective view of the vicinity of the tool rest when the tool rest is vertically elongated. FIG. 6B is a perspective view of the vicinity of the tool rest showing yet another example of a vertically elongated tool rest, and FIG. 6C is a view taken along the line II in FIG. 6B. FIG. 7 is a perspective view of the vicinity of the turret of an NC & machine according to another embodiment of the present invention. FIG. 8 is a perspective view of the vicinity of the tool rest of an NC lathe according to still another embodiment of the present invention. FIG. 9 shows an NC according to still another embodiment of the present invention.
FIG. 2 is a perspective view of the vicinity of the turret head of the lathe. 20... Main spindle, 30... Longitudinal feed stand, 40... Lateral feed stand, 50... Vertical feed stand, 60... Tool rest, 70... Tool rest for hole machining, 80... 0 al 0 al 70a ・ 130 ・ lObie 1 G ・ ・ ・ GM ・ ・ ・ Turret head, 50b...Upper and bottom feed stand, 60b160c1...Turret, ...Hole machining tool stand,... 2nd longitudinal feed base, 102'...rotary tool 1, belt, gear, ■G2, ■G3...idle gear, motor Fig. 4 Fig. 5 Fig. 6C

Claims (9)

[Claims] (1) A headstock that rotatably supports the main spindle, a longitudinal feed that is located in front of this headstock and moves in the Z-axis direction that is the centerline direction of the main spindle, and a longitudinal feed that is located on this longitudinal feed that moves the A horizontal feed table that moves in the X-axis direction, which is perpendicular to the Z-axis and moves toward and away from the spindle center line; and a Y-axis, which is on the horizontal feed table and is perpendicular to the Z-axis and the X-axis. An NC lathe comprising a vertical feed table that moves in the vertical direction, a tool rest that holds a plurality of tools attached to the vertical feed table, and a numerical control device that controls movement in each axis direction. (2) A headstock that rotatably supports the spindle, and an X-axis direction that is located in front of the headstock and is orthogonal to the Z-axis, which is the centerline direction of the spindle, and that moves toward and away from the spindle centerline. a horizontal feed table that moves in the Z-axis direction, a longitudinal feed table that is on the horizontal feed table and moves in the Z-axis direction, and a Y-axis that is on the longitudinal feed table and is perpendicular to the Z-axis and the X-axis. An NC lathe comprising a vertical feed table that moves in the vertical direction, a tool rest that holds a plurality of tools attached to the vertical feed table, and a numerical control device that controls movement in each axis direction. (3) The NC lathe according to claim 1 or 2, wherein the tool rest has an annular structure. (4) The NC lathe according to claim 1 or 2, wherein the tool rest has a vertically elongated annular structure. (5) N according to claim (1) or (2), characterized in that the tool rest has an annular upper half or lower half structure.
C lathe. (6) The tool rest is two tool rests extending in a direction approaching the main shaft and a direction away from the main shaft in the X-axis direction, and
The NC lathe according to any one of claims 1 to 5, further comprising a rotational drive device for rotationally driving the tool rest around an axis extending in the Z-axis direction. (7) The tool rest extends in a direction approaching the main shaft in the X-axis direction, and is provided with a rotational drive device for rotationally driving the tool rest around an axis extending in the X-axis direction, and
The NC lathe according to any one of claims 1 to 5, wherein tools are attached to a plurality of surfaces forming a cross section of the tool rest taken along a vertical plane perpendicular to the X-axis. (8) The NC lathe according to any one of claims (1) to (7), characterized in that a turret head that moves in the Z-axis direction is provided on the opposite side of the main shaft with respect to the tool rest of the lathe. (9) Claims (1) to (1) characterized in that a turret head that moves in the Z-axis direction and the X-axis direction, or in the Z-axis direction and the Y-axis direction is provided on the opposite side of the main shaft with respect to the tool rest of the lathe. The NC lathe described in item (7).