JPH0453643A - Movable spindle stock device for machine tool - Google Patents

Abstract

PURPOSE:To enhance the support rigidity of a spindle in a movable spindle stock as well as to improve the extent of machining accuracy by setting up the movable spindle stock in a sliding guide free of movements, and assembling a motor with a rotor as one body with a spindle in this movable spindle stock. CONSTITUTION:A movable spindle stock 16, supporting a sub spindle 3, is set up shiftably in a parallel direction with a spindle and in a direction orthogonal with the former. The sub spindle 3 is supported by both front and rear brings 28 and 29 installed in the movable spindle stock 16 freely rotatable and a rotor 31 of a motor 30 assembled in the spindle stock 16 is solidly clamped to the outer circumference of an intermediate part. The sub spindle 3 has a chuck 34 holding a work W, while the rotor 31 of the motor 30 is constituted as one body with the sub spindle 3 and the motor 30 is assembled in the movable spindle stock 16. Thus, the movable spindle stock 16 can be formed into compact size, and support rigidity for the spindle stock 16 become enhanced, thus machining accuracy is improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a movable spindle stand device for a machine tool, which is applied to a sub-spindle of a turning center.

[Conventional technology]

Conventionally, in a turning center, as shown in FIG. 5, a main shaft 71. Turret 72. A sub-spindle 74 facing the main shaft 71 is provided with a milling head 73 and a milling head 73 .
There are some that have. The sub-spindle 74 is movable in the W-axis, which is the axial direction, and in the U-axis, which is perpendicular to the W-axis.

6 and 7 show the support structure of the sub-spindle 74. As shown in FIG. 7, a base slide 77 is installed on a first linear guide 76 provided on the inclined upper surface of the bed 75 so as to be able to move forward and backward. , a cross slide 79 is installed on a second linear guide 78 provided perpendicularly to the base slide 77 so as to be movable forward and backward.

Each linear guide 76, 78 provides rolling contact guidance. The sub spindle 74 is a cross slide 7
The rotation of a motor 81 mounted on a cross slide 79 is transmitted by a belt 82.

[Problem to be solved by the invention]

In the above configuration, the motor 81 for driving the sub-spindle 74 is connected to the cross slide 7 below the movable spindle stand 80.
9, the distance between the load point P of the tool acting on the sub-spindle 74 (FIG. 6) and the linear guide 78 becomes long. Therefore, sufficient supporting rigidity of the sub-spindle 74 cannot be obtained, resulting in a decrease in processing accuracy. Further, since the linear guide 7 provides guidance through rolling contact, there is also a problem in that the support rigidity is reduced.

An object of the present invention is to provide a movable spindle stand device for a machine tool that can increase the supporting rigidity of the spindle of the movable spindle stand and improve machining accuracy.

[Means to solve the problem]

The movable spindle stand device of the present invention has a motor having a rotor integrated with a spindle built into the movable spindle stand. The movable spindle stand rotatably supports a spindle, and is installed on a sliding guide so that it can move forward and backward.

[For production]

According to the configuration of the present invention, the rotor of the motor is integrated with the spindle, and the motor is built into the movable spindle stand, so that the movable spindle stand can be configured compactly. Therefore, the sliding guide of the movable spindle stand can be brought closer to the load point of the tool acting on the spindle, increasing support rigidity.

Furthermore, since a sliding guide is used to guide the movable spindle stand, support rigidity is also increased.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 4 is a perspective view showing the entire turning center.

This turning center includes a main shaft portion 2 having a main shaft l;
A sub-spindle part 4 having a sub-spindle 3 facing the main shaft 1, a turret part 5, a milling head part 6,
It is composed of a tool changer section 7.

The main shaft portion 2 has a main shaft 1 supported on a headstock 9 fixed to the forward inclined upper surface 8a of the bed 8, and the main shaft 1 is driven by a main shaft motor 10.

Although the sub-spindle section 4 will be described in detail later, the movable spindle stand 16 supporting the sub-spindle 3 is connected to the main shaft 1.
It is installed so as to be movable in the W-axis direction parallel to this and the U-axis direction perpendicular thereto. The present invention is applied to the movable spindle stand 16.

The turret part 5 includes a turret 11 on which a turning tool is attached, which is indexably mounted on a turret stand 12.
The bed 8 can be fed in two orthogonal directions as shown by the arrows.
It was installed in

The milling head section 6 has a milling head 13 on which a rotary tool is replaceably mounted, which is movable in two orthogonal directions along the inclined upper surface 8a of the bed 8 and in an up-down direction perpendicular to the inclined upper surface 8a. It can be rotated around the center.

The tool exchanger section 7 exchanges the tool of the milling head 13 with an arbitrary tool of the tool magazine 15 using the exchange arm 14.

A work mounted on the spindle l can be machined by either the turret 11 or the milling head 13. In addition, the workpiece attached to the main spindle 1 is transferred to the sub-spindle 3, and the turret 11 and milling head 1
3 can also be processed.

1 and 2 show the support structure of the movable spindle stand 16 of the sub-spindle section 4. As shown in FIG.
Two W-axis guides 17 are provided on the backward inclined upper surface 8b of the bed 8, and the pace slide F18 is connected to the bearing 1.
It is movably installed via 9. The base slide 18 is driven forward and backward in the W-axis direction by a ball screw 39 installed on the bed 8.

The base slide 18 is integrally provided with a guide member 20 that stands up against the W-axis guide 17, and two U-axis guides 21 (FIG. 1) consisting of rectangular sliding guides are attached to both side edges of the guide member 20. is formed. U-axis guide 2
1 is a cross slide 2 at the base end of the movable spindle table 16
The cross slide 22 is prevented from being removed by a bottom support 24 that fits into a guide groove 23 provided in the cross slide 2 and is fixed to the lower surface of the cross slide 22. The movable spindle stand 16 is driven forward and backward by
Hydraulic cylinder with rod position Q shown in Figure 1 (not shown)
This is done by

In FIG. 2, to explain the support structure of the turret stand 12, a linear guide 25 provided on the inclined upper surface 8a of the bed 8
A first base slide 26 is installed on the top surface of the first base slide 26, and a turret stand 12 is installed on a linear guide 27 provided perpendicularly to the linear guide 25 on the upper surface thereof.

FIG. 3 shows a cross section of the movable spindle stand 16 of the sub-spindle section 4. As shown in FIG. The sub-spindle 3 is a movable spindle base 1
A rotor 31 of a so-called built-in type motor 30, which is rotatably supported by front and rear bearings 28 and rear bearings 29 provided in the movable spindle stand 16, is integrally fixed to the outer periphery of the intermediate part. There is. The motor 30 is of a synchronous type or the like, and the rotor 31 is composed of magnets. A stator 32 of the motor 30 is located on the outer periphery of the rotor 31 and is provided on the movable spindle stand 16, and is wound with a stator coil 33. The sub-spindle 3 has a chuck 34 for gripping the workpiece W, and a push-out rod 35 for the workpiece-a passes through the center thereof so as to be freely forward and backward.

A rotation angle detection member 37 is provided on the rear outer periphery of the sub-spindle 3, and the rotation angle of the sub-spindle 3 can be determined by detecting the rotation angle with the detector 36. Moreover, the indexing angle can be maintained by the brake 38.

According to this configuration, when machining the workpiece Wa on the sub-spindle 3 using the tool of the turret 11 in FIG. When machining with a tool, move it upward in the U-axis direction. Milling head 13
When machining with a rotary tool, the sub-spindle 3 is indexed at a predetermined angle and stopped. Movable spindle stand 16
The movement in the W-axis direction is performed when a workpiece on the main spindle 1 is transferred to the sub-spindle 3, for example.

In this way, the movable spindle stand 16 of the sub spindle 3
moves in two axes directions U and W, but sufficient support rigidity for the sub-spindle 3 can be obtained as described below. That is,
As shown in FIG. 3, the rotor 31 of the motor 30 of the sub-spindle 3 is integrated with the sub-spindle 3, and the motor 30 is built into the movable spindle stand 16, so that the movable spindle stand 16 can be configured compactly. . Therefore,
The U-axis guide 21 of the movable spindle stand 16 can be brought closer to the load point P (Fig. 1) of the tools of the turret E 1 and the milling head 13 that act on the sub-spindle 3, and the support rigidity of the movable spindle stand 16 is increased accordingly. Become. Further, since a rectangular sliding guide is used for the U-axis guide 21 of the movable spindle stand 16, the support rigidity in the guide portion is also increased.

In this way, the overall support rigidity of the sub-spindle 3 is improved, and therefore the processing accuracy is improved.

Although the motor 30 is of a synchronous type in the above embodiment, it may be configured as an induction type or a brushless DC motor.
A V-shaped or dovetail-shaped sliding guide may also be used.

Further, although the above embodiment has been described with reference to the case where it is applicable to the sub-spindle 3 in a turning center, the present invention can be applied to a movable spindle stand whose position is changed in general.

〔Effect of the invention〕

In the movable spindle stand device of the present invention, the rotor of the motor is integrated with the spindle, and the motor is built into the movable spindle stand. Therefore, the movable spindle stand can be configured compactly, and the sliding guide of the movable spindle stand can be made compact. of,
The load point of the tool acting on the spindle can be brought closer. Therefore, the supporting rigidity of the movable spindle stand is increased. In addition, since a sliding guide is used to guide the movable spindle table, the support rigidity of the guide is also increased, and this improvement in support rigidity has the effect of improving processing accuracy.

[Brief explanation of drawings]

FIG. 1 is a front view of the vicinity of a movable spindle table according to an embodiment of the present invention, viewed diagonally from below, FIG. 2 is a side view of the same portion, and FIG. 3 is an enlarged sectional view of the same movable spindle table.
Fig. 4 is a schematic perspective view of the entire turning center equipped with the same movable spindle stand device, Fig. 5 is an explanatory diagram of the parts arrangement of a conventional turning center, and Fig. 6 shows the movable spindle stand of the sub-spindle diagonally downward. FIG. 7 is a side view of the same. DESCRIPTION OF SYMBOLS 1...Main shaft, 2...Main shaft part, 3...Sub spindle, 4...Sub spindle part, 5...Turret part,
6... Milling head part, 8... Head, 16...
・Movable spindle stand, 17...W-axis guide, 1 day...
・Base slide, 20... Guide member, 21...
U-axis guide (sliding guide), 22... Cross slide, 23... Guide groove, 24... Bottom support, 2
8...Front bearing, 29...Rear bearing, 30...Motor, 31...Rotor, 32...Stator, P...
・Load point, U, W...Axial diagram t

Claims (1)

[Claims] A movable spindle stand that rotatably supports the spindle,
A movable spindle stand device for a machine tool, wherein a motor is installed in a sliding guide so as to be movable back and forth and has a rotor integrated with the spindle, and is incorporated into the movable spindle stand.