JPH0538651A - Machine tool - Google Patents

Abstract

PURPOSE:To provide the above machine tool fitted with a turret, which is equipped with high speed rotatability, presents lesser noise and vibration, and excels in the aspect of maintenance and management. CONSTITUTION:A turrent head 9 of a machine tool is fitted with a plurality of spindle holders 12 at a certain spacing in the head rotating direction, and each of these holders 12 is fitted with a spindle 13 rotatably on which a rotary tool 14 is mounted at one end, while at the other end of the spindle 13, a rotor 15 is coaxially mounted as constituting a motor for driving the spindle. In a position confronting this other end of spindle 13 in the indexing position C, a stator 16 is provided which constitutes the spindle driving motor together with the mentioned rotor 15 and which can reciprocate on the axis of the spindle 13, which is thus rotated directly by the motor composed of these stator 16 and rotor 15 for applicable spindle 13 which is stopped in the indexing position C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool which selectively uses a plurality of rotary tools by indexing and rotating a turret head.

[0002]

2. Description of the Related Art A machine tool of this type is provided with a turret head that can be indexed and rotated, for example, on a saddle that is driven forward and backward toward a machining position.
It has multiple spindle heads with various rotary tools attached. Further, the saddle is provided with a motor for driving a spindle, a rotation transmission mechanism constituted by gears, belts, etc., a clutch mechanism for connecting and disconnecting the rotation transmission mechanism and the spindle head at the indexing position, Alternatively, a turret head indexing rotation mechanism or the like is incorporated.

A machine tool provided with such a turret head is used in a state in which each rotary tool is firmly attached during a series of machining processes, and therefore, compared with a machining center or the like in which rotary tools are frequently replaced. The structure of the tool mounting part is advantageous for high speed machining.

[0004]

However, in the above-mentioned conventional machine tool, the rotation of the motor for driving the spindle is transmitted to the spindle head through the rotation transmission mechanism such as gears and belts. There is a limit to increase the number of rotations of the. In addition, when the above-mentioned rotation transmission mechanism is used, vibration and noise are likely to occur at high speed rotation,
There are problems such as complicated maintenance, and it has been a problem to solve these problems.

It is possible to abolish the rotation transmission mechanism and use a built-in motor system. In this case, however, motors are required for the number of main shafts, which causes a problem that the entire machine becomes complicated and large in size.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. In a machine tool equipped with a turret head, high speed rotation is possible, vibration and noise are small, and It aims to provide machine tools that are excellent in terms of maintenance management.

[0007]

A machine tool according to the present invention is a machine tool provided with a turret head that can be indexed and rotated, and a plurality of spindle holders are provided on the turret head at predetermined intervals in the rotational direction. At the same time, each of the spindle holders is rotatably provided with a spindle to which a rotary tool is attached, and the other end of each of the spindles is coaxially provided with a rotor that constitutes a motor for driving the spindle. In the position facing the other end side of the main shaft in the above, a motor for driving the main shaft is configured with the rotor, and a stator capable of reciprocating on the axis of the main shaft is provided.
The above configuration is used as means for solving the problem.

[0008]

In the machine tool according to the present invention, by advancing the stator with respect to the spindle stopped at the indexing position by the rotation of the turret head, the stator and the rotor at the other end of the spindle drive the spindle. Make up the motor,
The main shaft is directly rotated by the motor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.

That is, the machine tool in the drawing is provided with a slider 3 which is slidable in a horizontal X direction (left and right direction in the drawing) by a guide 2 on a base 1, and this slider 3 is also provided.
In addition, the work support base 4 is provided which is slidable in the Y direction which is orthogonal to the X direction in the horizontal direction. As a result, the work support base 4 is movable in two directions that are orthogonal to each other horizontally. Also,
A column 5 is erected on one side of the base 1,
The column 5 has an elevating / lowering body 8 driven by an elevating / lowering motor 6 and guided by a guide 7 in the Z direction, that is, in the vertical direction.
Is prepared.

A turret head 9 having a truncated cone shape is attached to the elevating body 8 with the central axis A of rotation of the turret head tilted by about 45 degrees, and an index for rotating the turret head 9 is provided. A motor 10 for use is provided. The turret head 9 has internal teeth 20 over the entire inner circumference thereof, and the internal gear 20 is engaged with a small gear 11 rotatably mounted on the output shaft of the indexing motor 10.

The turret head 9 of this embodiment is provided with spindle holders 12 (only two of which are shown in the drawing) 12 at intervals of 90 degrees in the rotational direction. Each of the spindle holders 12 has a cylindrical shape, and the central axis B is provided in a state of being parallel to the inclined surface 9a of the turret head 9, and the spindle 13 is rotatable inside via various bearings. It is attached to. In addition, the machine tool has a central axis B of the spindle 13.
The position at which is vertical is the index position C.

A predetermined rotary tool 14 is attached to one end of each main shaft 13 at the lower side at the indexing position C, and a rotor 15 constituting a motor for driving the main shaft is coaxially provided at the other end at the upper side. It is provided in the state.

Further, at a position facing the other end side (upper side) of the main shaft 13 at the indexing position C, a stator 16 which constitutes a motor for driving the main shaft together with the rotor 15 is provided.
It is provided so as to be able to reciprocate on the axis of the main shaft 13. The stator 16 is attached to an arm 17 fixed to the elevating body 8 so as to be vertically movable, and is vertically driven by a motor 18 for driving a stator provided on the upper portion of the arm 17. The arm 17 has a rotor 1 for each main shaft 13.
A cover 19 is attached to cover the portion 5 and the stator 16.

Here, the rotor 15 and the stator 1
As the motor for driving the spindle configured by 6, for example,
A brushless motor can be applied. That is, the rotor 15 is composed of permanent magnets and the stator 16 is
With a plurality of windings in different phases. Then, the rotation speed can be increased or decreased by controlling the power supply to the stator 16.

The machine tool having the above-described structure is for indexing in the process of machining a work (not shown) on the work support 4 with the stator 16 in the raised position shown by the phantom line in the drawing. After the turret head 9 is rotated by the motor 10 to stop the selected rotary tool 14 at the indexing position C, the stator 16 is lowered to the outer peripheral position of the rotor 15 of the main shaft 13. As a result, the stator 16 and the rotor 15 of the spindle 13 constitute a motor for driving the spindle.

Then, the main shaft 13 is directly rotated by energizing the stator 16, the lifting / lowering body 8 is lowered by the operation of the lifting / lowering motor 6, and the work support base 4 is moved to process the work. In addition, other rotary tools 1
4 is used, the stator 16 is raised and the turret head 9 is indexed and rotated.

As described above, since the machine tool directly drives the main shaft by the motor without using the rotation transmission mechanism including gears and belts, the structure is extremely simple and
Vibration and noise are less likely to occur even when rotating at high speed.
Further, since the rotor 15 and the stator 16 compose a motor for driving the main shaft only for the main shaft 13 at the indexing position C, it is not necessary to provide a motor for each main shaft, and the number of main shafts is the above. Even if the number exceeds four shown in the example, it can be easily dealt with.

[0019]

As described above, according to the machine tool of the present invention, in the machine tool having the turret head holding a plurality of spindles, the conventional rotation transmission mechanism including gears and belts is not used. Since the main shaft is directly driven by the motor composed of one stator and the rotor of the main shaft at the indexing position, it is possible to easily deal with the operation and the increase of the rotation speed due to the high speed rotation, and to reduce the vibration and noise. It can be kept small, and moreover, because the stator is shared by the rotors of the multiple spindles at the indexing positions, the structure is extremely simple, and maintenance management can be performed easily. It is possible to achieve an excellent effect that the size can be reduced.

[Brief description of drawings]

FIG. 1 is a side view illustrating a machine tool according to an embodiment of the present invention.

[Explanation of symbols]

 9 Turret head 12 Spindle holder 13 Spindle 14 Rotating tool 15 Rotor 16 Stator C Indexing position

Claims (1)

[Claims] 1. A machine tool having a rotatable turret head for indexing, wherein the turret head is provided with a plurality of spindle holders at predetermined intervals in a rotation direction thereof, and each spindle holder is rotated at one end thereof. A main shaft to which a tool is attached is rotatably provided, and a rotor constituting a motor for driving the main shaft is coaxially provided at the other end of each of the main shafts, and at a position facing the other end of the main shaft at an indexing position. A machine tool comprising a motor for driving a main spindle together with the rotor, and a stator capable of reciprocating on the axis of the main spindle.