JPH0453644A - Movable spindle stock device for machine tool - Google Patents

Abstract

PURPOSE:To heighten the extent of support rigidity at time of cutting of a movable spindle stock without requiring any delicate clearance adjusting operation by setting up the movable spindle stock in a guide member free of movements, and installing a clamper which clamps the spindle stock to the guide member at the specified moving position. CONSTITUTION:A movable spindle stock 16, supporting a sub spindle 3, is set up in a W axial direction parallel with a spindle 1 and in a U axial direction orthogonal with the former, and each clamp cylinder 40 of a clamper is installed at both ends of each bottom support 24. When the movable spindle stock 16 is shifted in the U axial direction, no hydraulic pressure is given to the clamp cylinders 40 and smooth movement is carried out by a clearance between the bottom support 24 and the U axial guide 21. At both stroke ends in the U axial direction, the U axial guide 21 is pressed by a piston 43 of the clamp cylinder 40, dispensing with any clearance between the bottom support 24 and the U axial guide 21, and high support rigidity of the sub spindle at time of cutting is obtained, through which machining accuracy is improved.

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. 7, a main shaft 71. Turret 72. A sub-spindle 74 facing the main shaft 71 is provided with a milling head machine 3.
There are some that have. The sub-spindle 74 is movable in the W-axis direction, which is the axial direction, and in the U-axis direction, which is perpendicular to this. In position, milling to Rad7
When processing using 3, move it to the upper position as shown by the chain line.

8 and 9 show the support structure of the sub-spindle 74. As shown in FIG.
A base slide 77 is installed in a linear guide 76 such that it can move forward and backward, and a cross slide 79 is installed in a second linear guide 78 that is provided perpendicularly to the base slide 77 so that it can move forward and backward. Each linear guide 76, 78 provides rolling contact guidance. The sub spindle 74 is supported by a movable spindle stand 80 fixed to a cross slide 79,
The rotation of a motor 81 mounted on the cross slide 79 is transmitted by a belt 82.

However, in the above configuration, since the motor 81 for driving the sub-spindle 74 is mounted on the cross slide 79 below the movable spindle stand 80, the load point P of the tool acting on the sub-spindle 74 (Fig. 8) and the linear The distance to the guide 78 becomes longer. Therefore, sufficient supporting rigidity of the sub-spindle 74 cannot be obtained, resulting in a decrease in processing accuracy. In addition, since the linear guide 7B guides by rolling contact,
This also reduces support rigidity.

Therefore, as shown in FIG.
We have proposed a built-in motor type in which the motor 83 is incorporated into the movable spindle stand 80. Further, the guide in the U-axis direction is configured with a sliding contact corner guide 84. Between the corner guide 84 and the bottom support 85 of the movable spindle stand 80, a taper gib 86 (
(Fig. 11), and adjust the pushing depth of the taper gib 86 in the direction of the arrow with the adjustment screw 87.
Eliminate gaps in

When the motor 83 is built-in in this manner, the movable spindle stand 80 is formed compactly, the distance between the U-axis corner guide 84 and the load point P of the sub-spindle 74 can be shortened, and the rigidity is increased accordingly. Also, corner guide 8
4 and interpose the taper gib 86, there is no gap in the guide portion, thereby improving machining accuracy.

[Problems to be Solved by the Invention] However, the adjustment of the taper gib 86 is performed using the movable spindle stand 8.
0 must be moved smoothly and without any gaps, which requires very delicate adjustment and is difficult.

An object of the present invention is to provide a movable spindle table device for a machine tool that can increase the support rigidity during cutting in the guide section of the movable spindle table without requiring delicate gap adjustment work, and improve machining accuracy. It is to be.

[Means to solve the problem]

In the movable spindle stand device of the present invention, a movable spindle stand that rotatably supports a spindle is provided on a guide member so that it can move forward and backward! However, a clamp device is provided for fixing the movable spindle base to the guide member at a predetermined advance/retreat position of the movable spindle base.

[For production]

The movement of the movable spindle table is performed with the clamp of the clamp device released, so that the movable spindle table moves smoothly due to the gap between the guide member and the movable spindle table. When the movable spindle stand comes to a predetermined advance/retreat position where cutting or the like is performed, the clamping device is put into a clamping state and the movable spindle stand is fixed to the guide member without a gap. In this fixed state, the workpiece of the spindle is cut, etc.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 6.

FIG. 6 is a perspective view showing the entire turning center.

This turning center includes a main shaft portion 2 having a main shaft 1;
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 l 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 equipped with a rotary tool exchangeably, which is movable in two orthogonal directions along the inclined upper surface 8a of the hand 8 and in an up and down direction perpendicular to the inclined upper surface 8a. It is rotatable around the axis.

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 main spindle 1 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. FIG. As shown in Figure 2,
Two W-axis guides 17 are provided on the backward inclined upper surface 8b of the head 8, and the base slide 18 is attached 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 head 8.

The base slide 18 is integrally provided with a guide stand 20 that stands up with respect to the W-axis guide 17.
Two rectangular U-axis guides 21 (FIG. 1), which are sliding contact guide members, are formed on both side edges of. The U-axis guide 21 is fitted into a guide groove 23 provided in a cross slide 22 at the base end of the movable spindle stand 16, and is supported by a bottom support 24 fixed to the lower surface of the cross slide 22 with bolts 41 (FIG. 5). Extraction has been stopped. A gap is provided between the bottom support 24 and the U-axis guide 21 to allow smooth movement, and each bottom support 24
A clamp cylinder 40, which is a clamp device, is provided at both ends (FIG. 4).

The movement of the movable spindle base 16 is driven by a hydraulic cylinder or a ball (not shown (not shown), which shows the rod position Q in FIG. 1).
This is done by

The clamp cylinder 40 has a piston 43 fitted into a cylinder chamber 42 formed in the bottom support 24, as shown in FIG. 5, and a preloading spring member 45 provided between the piston 43 and the camp 44. The cylinder chamber 4'2 is connected to an oil pressure source through an oil passage 46. piston 43
The upper thin shaft portion 43a protrudes from the upper surface opening of the cylinder chamber 42 to press the U-axis guide 21, and a sealing material such as an O-ring is provided on the outer periphery of the upper shaft portion 43a and the outer periphery of the cap 44.

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 motor 30 is rotatably supported by a front bearing 28 and a rear bearing 29 provided in the movable spindle stand 16, and is integrally fixed to the outer periphery of the intermediate part. . The motor 30 is of a synchronous type or the like, and the rotor 31 is composed of magnets. motor 3
The stator 32 of No. 0 is located on the outer periphery of the rotor 31 and 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 processing the workpiece Wa on the sub-spindle 3 using the tool on the turret 11 shown in FIG. When processing with the tool of the milling head 13, it is moved to the upper stroke end in the U-axis direction (the position shown by the solid line in FIG. 4).

Movement of the movable spindle stand 16 in the W-axis direction is performed when, for example, a workpiece on the main spindle l is transferred to the sub-spindle 3.

When moving the movable spindle stand 16 in the U-axis direction,
The clamp cylinder 40 (Fig. 5) is not applied with hydraulic pressure and the clamp is released. Therefore, the bottom support 24
A gap between the U-axis guide 21 and the U-axis guide 21 allows smooth movement. However, even during movement, preload is applied by the spring member 45 via the piston 43.

At both stroke ends in the U-axis direction, the clamp cylinder 40
The U-axis guide 21 is pressed by the piston 43 and clamped by hydraulic pressure. To clamp like this,
The gap between the bottom support 24 and the U-axis guide 21 during movement is eliminated, and high supporting rigidity of the sub-spindle 3 during cutting is obtained, improving machining accuracy.

In this way, since the gap can be eliminated by the clamp, assembly is easy without requiring delicate gap adjustment work. Furthermore, since the conventional taper gib is not used, the number of parts is reduced, and the number of processing and assembly steps are reduced.

In addition, this movable spindle stand device has a sub-spindle 3
Since the motor 30 is built into the movable spindle stand 16, the U-axis guide 21 is brought close to the load point P as shown in FIG.

The distance between the spindles 21 can be shortened, and this also increases the supporting rigidity of the sub-spindle 3.

In the above embodiment, the U-axis guide 21 is a rectangular sliding guide, but the U-axis guide 21 may be a V-shaped sliding guide or a rolling contact guide.

Further, although the clamp cylinder 40 is provided on the bottom support 24 in the above embodiment, the clamp cylinder 40 may be provided on the U-axis guide 21. An electromagnetic clamp device or the like may be used instead of the clamp cylinder 40.

Further, although the above embodiment has been described with reference to the case where it is applied 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〕

The movable spindle table device of the present invention is provided with a clamp device that fixes the movable spindle table to the guide member at a predetermined advancing/retracting position of the movable spindle table, so that machining can be performed with the movable spindle table fixed to the guide member by the clamp device. I can do it. Therefore, high support rigidity can be obtained regardless of the gap in the guide member when moving the movable spindle table, and therefore, without the need for delicate gap adjustment, support rigidity during cutting can be increased and machining accuracy can be improved. There is an effect.

[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 an explanatory diagram of the operation of the movable spindle table seen from above, FIG. 5 is an enlarged sectional view of the clamp cylinder, and FIG. 6 is a schematic perspective view of the entire turning center equipped with the movable spindle table device. Fig. 7 is an explanatory diagram of the parts arrangement of a conventional turning center, Fig. 8 is a front view of the movable spindle table of the sub-spindle seen diagonally from below, Fig. 9 is a side view thereof, and Fig. 10. 1 is a front view of a proposed example of a movable spindle stand device, and FIG. 11 is an enlarged sectional view of the taper gib portion thereof. 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... Bed, 16...
・Movable spindle stand, 17...W-axis guide, 18...
・Heath slide, 20...guide stand, 21...U
Axis guide (guide member), 22... cross slide,
23... Guide groove, 24... Bottom support, 30
...Motor, 40...Clamp cylinder (clamp device), 43...Piston, 45...Spring member Figure Figure Figure Figure Figure

Claims (1)

[Claims] A movable spindle stand that rotatably supports the spindle,
A movable spindle stand device for a machine tool, comprising a clamp device that is movably installed on a guide member and that fixes the movable spindle stand to the guide member at a predetermined advance/retreat position of the movable spindle stand.