JPH04129638A - Spindle drive mechanism for machine tool - Google Patents

Abstract

PURPOSE:To drive both a main spindle and a subspindle with the aid of a single motor and to make the rotation angles of two spindles coincide with each other by locating a gearform locking member to a subspindle to engage a stopper therewith, and locating an angle detector for the spindle. CONSTITUTION:A subspindle 12 is rotationally driven through a rotation transmission mechanism 23 with the aid of a motor 6 being a drive source for a main spindle 3. The subspindle 12 is provided on both sides of a pulley 31 with a pulley 32 for detection and a gearform lock member 33, and rotation is transmitted from the pulley 32 for detection to an angle detector 35 through a timing belt 34. In a stopper device 37, a stopper 38 is moved forward and backward by means of a hydraulic cylinder 39 to engage and disengage it with and from the gearform locking member 33. When machining by a main spindle 9 is completed, the main spindle 9 is rotated for division with the aid of the motor 6 so that the angle of the main spindle coincides with a detecting angle from the angle detector 35 for the subspindle 12. A subhead stock 13 is moved toward the head stock 1 side to transfer a work W of a main chuck 9 to a subchuck 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spindle drive mechanism for machine tools such as lathes and turning centers.

[Conventional technology]

BACKGROUND ART Conventionally, some lathes are equipped with a sub-spindle opposite to a main spindle, and the sub-spindle receives a workpiece machined by the main spindle so that machining of an unmachined part, so-called back machining, can be performed. The main spindle and the sub-spindle each have a chuck. The sub-head stock supporting the sub-spindle is configured to be able to move forward and backward relative to the main spindle in order to receive and pick up the workpiece.

In such a lathe, in order to reduce the weight of the sub-head stock that moves forward and backward, it has been proposed that the motor for driving the main spindle drives the sub-spindle via a clutch. -6080
Publication No. 1).

[Problem to be solved by the invention]

However, in such a configuration in which the spindle is driven by one motor, when the -degree clutch is disengaged, the rotation angles of the main spindle and the sub-spindle deviate. Therefore, in the case of a non-circular workpiece, it becomes impossible to pass the workpiece while maintaining the directionality. Therefore, it becomes impossible to perform directional processing on the workpiece gripped by the sub-spindle. for example,
It is not possible to drill holes in the radial direction with a rotating tool such as a trill.

An object of the present invention is to provide a spindle drive mechanism for a machine tool that allows workpieces to be received and transferred by matching the rotation angles of the main spindle and sub-spindle, and that allows both spindles to be driven by a single motor. .

[Means to solve the problem]

The spindle drive mechanism for a machine tool of the present invention includes a gear-like locking member provided on the sub-spindle, a stopper that removably engages with the gear-like locking member to stop the rotation of the sub-spindle, and An angle detector is provided to detect the rotation angle of the rotation angle.

The sub-spindle is provided opposite to the main spindle, and the rotation of the motor that drives the main spindle is transmitted via a clutch by a rotation transmission mechanism.

[Operation] When transferring a non-circular workpiece, the stopper is engaged with the gear-like locking member while the rotation of the sub-spindle is stopped, thereby fixing the rotation angle of the sub-spindle. This angle is detected by an angle detector.

Thereafter, the main spindle is indexed and rotated in accordance with the angle detected by the angle detector of the sub-spindle, so that the rotation angles of both spindles are matched.

It is also possible to stop the sub-spindle at a set angle while detecting the angle with an angle detector, and then stop the main spindle to match the set angle.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 shows a spindle drive mechanism in a lathe. A main spindle 3 is supported by the headstock 1 via a bearing 2, and the main spindle 3 is rotationally driven by a motor 6 located below via a pulley 4 and a V-belt 5 at the rear end. The V-belt 5 is hung around a pulley 8 on a drive shaft 7 of a motor 6.

The main spindle 3 is formed into a hollow shaft and has a main chuck 9 at its front end, and a rod-shaped workpiece W inserted from the rear is gripped by the main chuck 9 in a state slightly protruding from the front surface of the chuck.

The gripped workpiece W is processed by the tool of the turret 10 shown in FIG.

In FIG. 1, a sub-spindle 12 having a sub-chuck 11 is supported by a bearing 14 on a sub-head stock 13, facing the main spindle 3. The sub-head stock 13 is mounted on a slide table 15, guided by a rail 17 of a bed 16, and driven forward and backward toward the main spindle 3 by a ball screw 18. The ball screw 18 is screwed into a ball nut 19 of the slide table 15, and is rotationally driven by a servo motor 22 via a belt 21 in a pulley support box 20.

The rotation of the sub spindle 12 is driven by the main spindle 3.
The rotation is transmitted from the motor 6, which is the drive source, via the rotation transmission mechanism 23. The rotation transmission mechanism 23 is connected to the drive shaft 7 of the motor 6.
The rotating shaft 26 is connected to the clutch 24 via a universal joint 25. The rotation of the rotating shaft 26 is transmitted to the ball spline 28 via the belt 27 within the pulley support box 20. The ball spline 28 is supported by the pulley support box 20, passes through the slide table 15, and extends toward the main spindle 3 side. slide table 1
A pulley 29 that engages with the outer periphery of the ball spline 28 is rotatably attached to the boot 5, and a pulley 31 integrated with the sub spindle 12 is connected to the boot 1J29 via a belt 30.
Rotation is transmitted to.

The sub spindle 12 is provided with a detection pulley 32 and a gear-like locking member 33 on both sides of the pulley 31.
Rotation is transmitted from the detection pulley 32 to the angle detector 35 via the timing belt 34. The angle detector 35 is composed of, for example, a low-resolution encoder, and is installed on the sub-headstock 13 with a mounting member 36.

The gear-like locking member 33 is connected to the stopper 3 of the stopper device 37.
8 are engaged to prevent rotation, for example, a flat wheel with 46 teeth is used.

The stopper device 37, as shown in FIG.
8 is moved forward and backward by the hydraulic cylinder 39 to lock the gear-like locking member 33.
It is related to and disconnected from the The stopper 38 is pin-shaped with interlocking teeth formed at its tip. hydraulic cylinder 39
is installed on the sub-head stock 13 via a support member 40 that supports the stopper 38 in a movable manner. A detection piece 41 is attached to the rear of the stopper 38, and a proximity switch 42 that detects the detection piece 41 allows confirmation of the protruding and retracting position.

A chuck cylinder 43 is provided at the rear end of the sub-spindle 12 and drives the sub-chuck 11 to open and close. A similar chuck cylinder (not shown) is also provided on the main spindle 3.

The operation of the above configuration will be explained.

First, the case of a circular workpiece, that is, the case where only turning is performed, will be explained. A rod-shaped workpiece W inserted into the main spindle 3 from the rear is gripped by the main chuck 9, and rotated together with the main spindle 3 by the drive of the motor 6, while being machined using a tool on the turret 0 (FIG. 2). At this time, the clutch 24 is disengaged and the sub-spindle 12 is in a stopped state.

When the single-sided machining is completed, the sub-head stock 13 is brought close to the head stock 1 by the feed of the ball screw 18, and the tip of the workpiece W is gripped by the sub-chuck 11 while the main spindle 9 is kept rotating.

When the workpiece W is held by the chucks 9 and 11, a crack 24 occurs, and the rotation of the motor 6 is transmitted to the sub-spindle 12. As a result, the main spindle 3 and the sub-spindle 12 perform synchronous rotation. In this synchronous rotation state, the workpiece W is cut into pieces with a cutting tool.

The divided workpiece W, which has been machined on one side, is rotated by the sub-spindle 12 while its back side is machined by the tool of the turret 10. In this way, both sides are processed.

Next, the operation of passing the non-circular workpiece W will be explained.

In this case, when the sub-spindle 12 or the clutch 24 is disconnected from the motor 6 and the motor 6 is stopped, the stopper 38 of the stopper device 37 is projected by the hydraulic cylinder 39,
It meshes with the gear-like locking member 33, and the sub-spindle 12
Fix the rotation angle. The angle of this sub-spindle 12 is detected by an angle detector 35.

Thereafter, when the machining on the main spindle 9 is completed, the main spindle 9 is indexed and rotated by the motor 6 so as to match the angle detected by the angle detector 35 of the sub-spindle 12, and brought to a stopped state. In this state, the sub-head stock 13 is moved toward the head stock 1 side, and the workpiece W on the main chuck 9 is transferred to the sub-chuck 11.

In this way, the main spindle 3 and the sub spindle 12
The work W can be transferred by matching the rotation angles of the two. Therefore, the non-circular workpiece W can be transferred without causing any angular deviation.

Therefore, in the subsequent machining by the sub-spindle 12, the angle of the workpiece W can be determined with high precision, and various directional machining can be performed.

〔Effect of the invention〕

The machine tool spindle drive mechanism of the present invention includes a gear-like locking member provided on the sub-spindle to engage the stopper,
In addition, since a sub-spindle angle detector is provided, even though the configuration uses one motor to drive both the main and sub spindles, the sub-spindle is stopped from rotating with a stopper and the angle is detected, and the rotation angle of the sub-spindle can be detected. The rotation angle of the main spindle can be matched. Therefore, even if the workpiece is non-circular, it can be transferred to the sub-spindle while maintaining its directionality, and the sub-spindle can also be processed with directionality.

[Brief explanation of drawings]

FIG. 1 is a fractured pressure surface view of one embodiment of the present invention, FIG. 2 is a fractured side view thereof, and FIG. 3 is a fractured diagram taken along the line ■-■ in FIG. 2. 1...Headstock, 3...Main spindle,
6...Motor, 9...Main chuck, 10...
Turret, 11... Sub chuck, 12... Sub spindle, 13... Sub head stock, 18...
Ball screw, 23... Rotation transmission mechanism, 24... Clutch, 26... Rotating shaft, 28... Ball spline, 3
3... Gear-like locking member, 34-... Timing belt, 35... Angle detector, 37... Stopper device, 3
8...Stopper, 39...Hydraulic cylinder, W...
Work patent applicant: Murata Machinery Co., Ltd.

Claims (1)

[Claims] A rotation transmission mechanism is provided for transmitting the rotation of a motor that drives a main spindle to a sub-spindle facing the main spindle via a clutch, a gear-like locking member is provided on the sub-spindle, and the gear-like locking member is A spindle drive mechanism for a machine tool, comprising a stopper that is removably engaged to stop the rotation of the sub-spindle, and an angle detector that detects the rotation angle of the sub-spindle.