JP2000167740A - Drive mechanism of machining tool in machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive mechanism of a grinding wheel in a grinding machine capable of reducing the number of partitens of a rotary drive mechanism of a spindle rotating the grinding wheel, simplifying a structure, suppressing vibration of the spindle, improving rotation accuracy to reduce noise, and improving machining accuracy of a workpiece. SOLUTION: A turning saddle 21 is mounted in such a way that it can turn centered on C-axis inclined in a vertical face relative to a Z-axis saddle 15 mounted on a column so as to reciprocate in the direction of Z-axis. A motor 22 is mounted on a cylindrical part 21a of the turning saddle 21, a rotary shaft of the motor 22 is defined as a spindle 44, and a grinding wheel 23 is fitted in the spindle 44. Since the grindstone 23 is directly rotated by the spindle 44 of the motor 22, the grinding wheel is smoothly rotated, rotation accuracy is improved, and machining accuracy of a workpiece is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism for a working tool in a machine tool, and more particularly, to a column, which is provided with a C-axis turning saddle that turns around an inclined axis, and a working tool such as a grindstone is mounted on the turning saddle. The present invention relates to a drive mechanism of a processing tool in a mounted machine tool.

[0002]

2. Description of the Related Art Generally, in a grinding machine, a work is placed on a processing table that reciprocates in the X-axis direction.
A turning saddle that turns around a C-axis that is inclined with respect to a Z-axis saddle that reciprocates in a vertical direction mounted on a column that reciprocates in the Y-axis direction is provided. A spindle is supported by the revolving saddle, and a grindstone is mounted on the tip of the spindle. Then, the rotational motion of the drive motor mounted on the Z-axis saddle side is transmitted from the Z-axis saddle to the turning saddle via a power transmission mechanism, and the rotational motion is transmitted to the spindle, thereby rotating the grindstone and causing the grindstone to rotate on the machining table. The workpiece is ground.

[0003]

However, the drive mechanism of the grinding wheel in the conventional grinding machine has a drive motor provided on the Z-axis saddle side, and transmits the rotational motion of this motor to the spindle on the turning saddle side. Since a mechanism must be provided, the number of components of the rotary drive mechanism of the spindle for rotating the grindstone increases, and the structure is complicated, so that there has been a problem that manufacturing and assembling operations cannot be easily performed.

[0004] Further, since the power transmission path of the rotary drive mechanism of the spindle becomes long, wear due to vibration of related parts is liable to occur, noise cannot be suppressed, and the rotational accuracy of the spindle decreases, and the machining accuracy of the workpiece decreases. There was also a problem that it could not be improved.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, reduce the number of components of a rotary drive mechanism of a spindle, simplify the structure, suppress vibrations caused by the rotary motion of the spindle, and reduce noise. It is an object of the present invention to provide a drive mechanism for a processing tool in a machine tool, which can reduce the number of rotations, improve the rotational accuracy of the processing tool, and increase the processing accuracy of a workpiece.

[0006]

According to the first aspect of the present invention, a bed is provided with a working table for supporting a work and a column for supporting a work tool, and the work and the work tool are mounted on an X-axis.
The workpiece is machined by relatively moving in the Y-axis and Z-axis directions, and a turning saddle that turns around the C axis by a C-axis turning mechanism is mounted on the column, and the turning saddle is attached to the turning saddle. In a machine tool supporting a rotary shaft for rotating a tool, a drive motor is mounted on the turning saddle, a rotary shaft of the drive motor is used as a spindle, and a processing tool is mounted on the spindle.

According to a second aspect of the present invention, in the first aspect, the turning saddle is formed with a tubular portion, and the housing of the drive motor is fitted and fixed in the tubular portion. Claim 3
In the invention described in claim 2, the front end of the spindle of the drive motor is supported on the front side wall of the housing of the motor via a bearing, and the rear end of the spindle is connected to the bottom wall of the cylindrical portion. It is supported via bearings.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a Z-axis saddle is mounted on the column so as to be movable up and down by a Z-axis drive mechanism, and the turning saddle is mounted on the Z-axis saddle. It is installed.

According to a fifth aspect of the present invention, in the fourth aspect, the Z-axis saddle is provided with a C-axis bearing mechanism directed in the C-axis direction, and the C-axis bearing mechanism is provided with a shaft mounted on the turning saddle. The tube is mounted so that it can rotate around the C axis,
The barrel is turned by a C-axis turning mechanism provided on the Z-axis saddle.

According to a sixth aspect of the present invention, in the fifth aspect, the C-axis turning mechanism is attached to a pinion fitted to an end of a barrel and a Z-axis saddle so as to rotate the pinion. And a rack.

According to a seventh aspect of the present invention, in any one of the fourth to sixth aspects, the space formed in the Z-axis saddle communicates with the space formed in the revolving saddle through a passage in the barrel, and revolves. The space in the saddle communicates with the space in the housing of the drive motor through a passage formed in the cylindrical portion, and is configured to be able to supply coolant to the inside of the C-axis bearing mechanism and the drive motor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a drive mechanism for a grindstone of a grinding machine will be described below with reference to FIGS.

As shown in FIG. 3, a work W which is reciprocated on the upper surface of the bed 11 in the X-axis direction (horizontal direction perpendicular to the paper) by a not-shown X-axis drive mechanism via a support base 12.
There is provided a processing table 13 for supporting.
Similarly, a Y-axis column 14 reciprocated in the Y-axis direction (horizontal direction parallel to the paper surface) by a Y-axis drive mechanism (not shown) is provided on the upper surface of the bed 11, and the Y-axis column 14 has a Z-axis saddle 15 Are mounted so as to be able to reciprocate in the Z-axis (vertical) direction along the guide rail 18. A ball screw 17 is connected to a rotation axis of a Z-axis drive motor 16 constituting a Z-axis drive mechanism, and a ball nut 19 attached to the Z-axis saddle 15.
When the motor 16 is operated, the Z-axis saddle 15 is moved up and down.

The Z-axis saddle 15 has a predetermined angle (45 in this embodiment) in a vertical plane orthogonal to the X-axis.
The swivel saddle 21, which is swiveled about the C-axis inclined at (degree), is mounted. A drive motor 22, which will be described later, is mounted on a cylindrical portion 21a having a bottomed cylindrical shape of the revolving saddle 21, and a rotating shaft 44 of the motor 22 is used as a spindle 44, and the grindstone 23 as a processing tool is mounted on the spindle 44. Installed.

Next, the mounting structure of the turning saddle 21 to the Z-axis saddle 15 will be described. As shown in FIG.
A bearing holder 2 is provided on the inner peripheral surface of a boss 15a integrally formed so as to be inclined in the C-axis direction with respect to the Z-axis saddle 15.
The fourth flange portion 24a is fastened and fixed by a bolt 25. A flange 26a formed at one end of a shaft cylinder 26 is fastened and fixed to the revolving saddle 21 by a bolt 27. The shaft cylinder 26 has a radial bearing 28 on an inner peripheral surface of a bearing holder 24 on the Z-axis saddle 15 side. It is rotatably supported through. A position regulating ring 29 is housed on the inner peripheral surface of the boss 15a, and a radial plain bearing 30 is interposed between the position regulating ring 29 and the outer peripheral surface of the barrel 26. A ring-shaped rotating spacer 31 is interposed between the outer peripheral surface of the shaft cylinder 26 and the position regulating ring 29. A pinion 32 is fitted on the outer peripheral surface of the shaft cylinder 26, and can be synchronously rotated by a key 33. The pinion 32 is fastened and fixed between the rotation spacer 31 and a nut 34 screwed to the outer peripheral surface of the shaft cylinder 26. A rack 35 is supported on the Z-axis saddle 15 so as to be able to reciprocate in the horizontal direction.
Is meshed with the pinion 32, for example, the cylinder 3
When the rack 35 is reciprocated by the rod 6, the shaft cylinder 26 is reciprocated about the C axis via the pinion 32,
The turning saddle 21 is turned around the C axis.

The inclined mounting surface 15b of the Z-axis saddle 15 and the inclined mounting surface 21b of the revolving saddle 21 are inclined at 45 degrees perpendicular to the C axis, and an O-ring 37 is interposed between both surfaces 15b, 21b. ing.

In this embodiment, the bearing holder 2
4. The C-axis bearing mechanism 38 includes the radial bearing 28, the position regulating ring 29, the radial plain bearing 30, the rotating spacer 31, and the like. The shaft cylinder 26, the pinion 32, the rack 34, the cylinder 36 and the like constitute a C-axis turning mechanism 39 of the turning saddle 21.

A housing 41 constituting the drive motor 22 is fitted and fixed in the cylindrical portion 21a of the turning saddle 21. The rotating shaft of the drive motor 22, that is, both ends of the spindle 44, are rotatably supported on one side wall 41 a of the housing 41 of the drive motor 22 and one side wall of the cylindrical portion 21 a via bearings 42 and 43. ing. A rotor 45 having a permanent magnet is fitted and fixed on the outer peripheral surface of the spindle 44, and a coil 46 is mounted on the inner peripheral surface of the housing 41. Te whetstone 2
3 is rotated.

A space 15c formed inside the Z-axis saddle 15 communicates with a space 21c formed inside the revolving saddle 21 via an internal passage 26b of the barrel 26. The space 21c communicates with the internal space 41b of the motor housing 41 via a passage 21d. When the coolant is supplied to the space 15c, the coolant passes through the passage 26b of the shaft cylinder 26, and the turning saddle 21
And is supplied to the space 41b of the motor housing 41 from the passage 21d. Thus, the drive motor 22 is cooled, and the C-axis bearing mechanism, the bearings 42, 43, and the like are lubricated. Note that 47
Is a whetstone cover.

Next, the operation of the grinding machine configured as described above will be described. In FIG. 3, the work W to be ground is placed on the upper surface of the X-axis drive table 13 and fixed by a gripping mechanism (not shown). When the upper surface of the work W is to be ground, the grindstone 23 is held in a vertical plane orthogonal to the Y axis as shown in FIGS. In this state, when grinding is started by an operation signal from the automatic control device, the X-axis drive table 13 is controlled to move in the X-axis direction, the Y-axis column 14 is controlled to move in the Y-axis direction, and the Z-axis saddle 15 is controlled. Is controlled to move in the Z-axis direction by the rotation of the ball screw 17 of the motor 16. The grinding wheel 23 grinds the upper surface of the work W by a predetermined amount by the automatic control operation based on the previously stored programming.

Next, when grinding the vertical side surface of the work W installed on the upper surface of the Z-axis table 13, the Z-axis saddle 15 is moved upward by driving the motor 16 to the predetermined height. After the stop, the cylinder 36 is driven to move the rack 35 in one direction.
Pivoted about an axis. Then, the turning saddle 21 is turned in the same direction about the C axis, and the driving motor 2
2 and the grindstone 23 are turned. When the turning saddle 21 is turned by 90 ° in FIG. 1, the drive motor 22 is arranged in the vertical direction as shown in FIG. 2, and the grindstone 23 is positioned in a horizontal plane. In this state, when the spindle 44 of the drive motor 22 is rotated, the grindstone 23 is rotated.
Is rotated, and the vertical side wall surface of the work W is ground by the outer peripheral surface of the grindstone 23.

Next, the operation and effect of the above embodiment will be listed together with the configuration. (1) In the above embodiment, the drive motor 22 for rotating the grindstone 23 is attached to the C-axis turning saddle 21, and the spindle of the motor 22 is used as the spindle 44, and the grindstone 23 is attached to the spindle 44. For this reason, the rotational drive system for rotationally driving the grindstone 23 can be shortened, the number of parts can be reduced, and the manufacturing and assembling operations can be easily performed. Further, the rotational accuracy of the spindle 44 can be improved, its vibration can be suppressed, the noise can be reduced, and the grinding accuracy of the work W by the grindstone 23 can be improved.

(2) In the above embodiment, the drive motor 22
The housing 41 is fitted and fixed in the tubular portion 21a of the revolving saddle 21, and one end of the spindle 44 is supported by the bearing 43 provided on the tubular portion 21a side. It can be done easily.

(3) In the above embodiment, the space 15c of the Z-axis saddle 15 and the space 21c of the revolving saddle 21 are communicated by the passage 26b of the shaft cylinder 26, and the space 21c and the internal space 41b of the motor 22 are communicated by the passage 21d. Therefore, the coolant can be guided into the motor 21, and lubrication of the bearing mechanism and cooling of the motor 22 can be performed.

The above embodiment can be embodied as follows. In the above-described embodiment, the rack 35 is reciprocated by the cylinder 36 to revolve the revolving saddle 21, but the revolving motion of the motor may be used to operate the rack 35.

The drive motor 22 is integrally formed in advance,
The motor housing may be removably mounted on the pivot saddle. In the above embodiment, the present invention is embodied as a grinding machine. However, the present invention may be applied to a machine tool that rotates a processing tool such as a drilling machine or a milling machine by a spindle.

[0027]

As described in detail above, the present invention reduces the number of components of the rotary drive mechanism of the spindle for rotating the processing tool, simplifies the structure, suppresses vibration caused by the rotary motion of the spindle, and reduces noise. Can be reduced,
The rotation accuracy of the processing tool can be improved, and the processing accuracy of the work can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a central part showing an embodiment in which the present invention is embodied in a drive mechanism of a grindstone of a grinding machine.

FIG. 2 is a central longitudinal sectional view showing a state where the turning saddle is turned by 90 °.

FIG. 3 is a schematic right side view showing the entire grinding machine.

[Explanation of symbols]

11 bed, 12 support, 13 X-axis machining table, 14 Y-axis column, 15 Z-axis saddle, 15b inclined mounting surface, 16 Z-axis drive motor, 21 C-axis turning saddle, 21a Cylindrical part, 21b: inclined mounting surface, 21c: space, 21d: passage, 22: drive motor, 23: grindstone as a processing tool, 24: bearing holder, 26: shaft cylinder, 29: position regulating ring, 32: pinion , 35 ... Rack, 36 ...
Cylinder constituting C-axis turning mechanism, 38: C-axis bearing mechanism, 39: C-axis turning mechanism, 41: motor housing,
42, 43 ... bearing, 44 ... spindle.

Claims (7)

[Claims] 1. A work table for supporting a work and a column for supporting a work tool are mounted on a bed, and the work and the work tool are relatively moved in the X-axis, Y-axis, and Z-axis directions to work the work. A machine tool having a rotating saddle that rotates around the C axis by a C-axis rotating mechanism mounted on the column, and the rotating saddle supports a rotating shaft that rotates the processing tool. A drive mechanism for a processing tool in a machine tool having a drive motor mounted thereon, a rotating shaft of the drive motor being a spindle, and a processing tool mounted on the spindle. 2. A driving mechanism for a machining tool in a machine tool according to claim 1, wherein the turning saddle has a tubular portion formed therein, and a housing of a drive motor is fitted and fixed in the tubular portion. 3. The drive motor according to claim 2, wherein the front end of the spindle of the drive motor is supported on the front side wall of the housing of the motor via a bearing, and the rear end of the spindle is connected to the bottom wall of the cylindrical portion. A drive mechanism of a processing tool in a machine tool supported via bearings. 4. The machine tool according to claim 1, wherein a Z-axis saddle is mounted on the column so as to be able to move up and down by a Z-axis drive mechanism, and the turning saddle is mounted on the Z-axis saddle. Drive mechanism of the processing tool. 5. The Z-axis saddle according to claim 4, further comprising: a C-axis bearing mechanism attached to the Z-axis saddle.
A shaft cylinder attached to the pivot saddle is mounted on the shaft bearing mechanism so as to be pivotable about a C-axis, and the cylinder is pivoted by a C-axis pivot mechanism provided on the Z-axis saddle. Drive mechanism for processing tools. 6. The C-axis turning mechanism according to claim 5, wherein the C-axis turning mechanism comprises a pinion fitted to an end of the barrel, and a rack attached to a Z-axis saddle and configured to rotate the pinion. Drive mechanism of a working machine tool. 7. The space defined in any one of claims 4 to 6, wherein the space formed in the Z-axis saddle is communicated with a space formed in the turning saddle through a passage in the barrel, and the space in the turning saddle is A drive mechanism for a working tool in a machine tool, which is in communication with a space in a housing of a drive motor through a passage formed in the cylindrical portion and is configured to be able to supply coolant to the inside of the C-axis bearing mechanism and the drive motor. .