JPH0639605A - Sizing stopper inside of main spindle - Google Patents

Abstract

PURPOSE:To provide a center movement type sizing stopper inside of a main spindle, which can fit the sizing center of a sizing stopper for positioning the longitudinal position of a work in a center hole of the work at the time of inserting a shaft type work from a chuck side into a hole of the main spindle to work the tip of the work. CONSTITUTION:An air hole 8a is provided in an adjustment screw 8 provided in the rear end of a main spindle 2, and a sizing center 13 is inserted into a hole of a draw tube 5 inside of the main spindle air-tightly and freely to move, and the sizing center 13 is projectingly energized to the tip of the main shaft by the pressure air. Under the condition that a work is supported between the projected sizing center 13 and a tailstock center 17, the sizing center 13 is pushed into the hole by the movement of a tailstock 16, against the force of the air pressure, to insert the workW.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-spindle sizing stopper for positioning in the longitudinal direction when a relatively long shaft work is inserted from the chuck side into the spindle hole and chucked.

[0002]

2. Description of the Related Art Conventionally, when turning the end of a relatively long shaft work, the work W is inserted into the spindle hole as shown in FIG. It has been common to apply a center hole at the rear end to determine the position in the longitudinal direction, and hold the position near the front end of the work by the spindle chuck 102 to perform processing.

[0003]

The sizing stopper described in the prior art allows the center hole of the work piece to face relatively easily when the center position is close to the spindle chuck. However, it is difficult to face the center hole, and there is a problem in that misalignment is likely to occur and causes machining defects. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to move a sizing center to the spindle chuck side so that the work can be easily attached and detached in the longitudinal direction. It is intended to provide a sizing stopper in the main spindle for positioning.

[0004]

In order to achieve the above object, the in-spindle sizing stopper according to the present invention has an adjusting screw for axially positioning when a shaft work is inserted into the spindle from the chuck side and attached. In the sizing stopper, an air pressure means for axially movably and airtightly inserting a sizing center in front of the adjusting screw in the spindle hole, and urging the sizing center toward the chuck side as necessary is provided. It is provided.

[0005]

[Function] The pressure work is used to support the work piece between the tailstock center and the sizing center in a state where the sizing center is projected from the tip of the spindle by the pressure air, and the force of the pressure air is generated by moving the tailstock to the Z-axis main spindle side. Push the sizing center against and insert the shaft work into the spindle hole, and position the sizing center at the position where it abuts the adjusting screw at the rear end of the spindle hole. Then, the chuck is closed to grip the tip of the shaft work. Then, the pressure switch detects that the front end opening of the air hole of the sizing center is blocked by the center hole of the work, and the engagement of the center hole is confirmed.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a headstock 1 is fixed on the left side of a bed (not shown), and a main shaft 2 is rotatably supported on the headstock 1 by a plurality of bearings. A chuck 3 is concentrically fixed to the tip of the main shaft 2 and a rotary cylinder 4 is concentrically fixed to the rear end of the main shaft 2, and a draw tube 5 is axially movably inserted into a center hole of the main shaft 2. The draw tube 5 is connected to a piston 6 in the rotary cylinder 4 and a plunger (not shown) for opening and closing the gripping claws 3a of the chuck 3, and also serves as a cylinder for a sizing stopper.

An adjusting screw 8 is screwed to a rear lid 7 fixed to the rear end of the rotary cylinder 4, and the adjusting screw 8 has a tip which is rotatable and axially movable in a draw tube 5 through a seal 10 and is airtight. Has been inserted. The adjusting screw 8 has an air hole 8a at its center, and pressurized air is supplied into the draw tube 5 through the air hole 8a via the rotary joint 9 at the rear end. Pressure air is supplied to the rotary joint 9 from an air source (not shown) through a pipe line 11, and a center engagement confirmation pressure switch 12 is attached in the middle of the pipe line 11. In the draw tube 5, a sizing center 13
Is axially movable and airtightly inserted.

The sizing center 13 has an air hole 13a at the center thereof, and a check valve 14 which acts freely on the chuck 3 side is provided at the rear end of the air hole 13a. A stopper ring 15 for fixing the forward end position of the center 13 is fixed. On the other hand, a tailstock 16 is movably mounted on a Z-direction guide provided on the bed, and the tailstock is attached to the tip end of a tailstock shaft movably provided on the tailstock 16. The center 17 is detachably attached. The tailstock 16 is linked by a saddle (not shown) capable of Z-axis movement positioning, and a work transfer robot having a robot hand 18 is installed on the floor near the bed.

Next, the operation of this embodiment will be described.
With the work W not gripped, the sizing center 13
Is pushed to the tip position by the pressure air, and the chuck 3
The tip of the center can be seen in the hole of the tailstock, and the tailstock 16 is connected to a saddle (not shown), and stands by at a position near the right end on the bed in a position where it can be moved immediately. Robot hand 18
After the workpiece W gripped by the workpiece W is loaded and positioned on the spindle centerline as shown by the solid line in FIG. 1, the work W moves leftward by the movement of the robot hand 18 toward the spindle in the Z-axis direction, and the center hole Engages with the sizing center 13. Next tailstock 1
6, the tailstock center 17 engages with the center hole of the work W, and the work W is supported by the sizing center 13 and the tailstock center 17.

Next, the robot hand 18 opens to open the work, and then rises and separates from the work W. Then, the tailstock 16 moves to the Z-axis direction main shaft side, the sizing center 13 is pushed against the pressure air to insert the work into the main shaft, and the sizing center 13 contacts the tip 8b of the adjusting screw 8. Stop in contact. When the sizing center 13 is pressed against the adjusting screw 8 in this manner, the tip of the small-diameter portion 8b having the radial notch groove at the tip of the adjusting screw opens the check valve 14 and the air hole 1
The compressed air is supplied to 3a. Therefore, if the sizing center 13 is properly engaged with the center hole of the work W, the pressurized air will not leak from the tip of the air hole 13a, and the pressure in the conduit 11 will not drop. However, when they are not engaged, the pressurized air leaks and the pressure in the pipeline decreases.
When this pressure difference is detected by the pressure switch 12 and there is no pressure drop, an engagement confirmation signal is output. Pressure oil is supplied to the front chamber of the rotary cylinder 4 by this engagement confirmation signal, the draw tube 5 is drawn in, the gripping claws 3a of the chuck 3 are closed, and the tip of the work W is gripped.

Then, the tailstock 16 is moved to the Z-axis direction anti-spindle side and retracted to a position where there is no interference, and then turning is performed. When the turning process is completed, the tailstock 16 moves to the spindle side again to support the tip of the work and open the chuck 3. Next, when the tailstock 16 is moved to the opposite main shaft side, the sizing center 13 follows and advances with the rear end of the work being supported by the pressure air. Then, when the sizing center 13 moves to the forward end position, the movement of the tailstock 16 is temporarily stopped, the robot hand 18 descends to grip the work W, and the tailstock 16 moves again to the opposite main spindle side to move the work. Move away from W and retreat to a position where there is no interference. Next, the robot hand 18 moves to the Z-axis direction opposite main spindle side to extract the rear end of the work W from the chuck 3 hole, and then carries the work W out of the machine.

[0012]

Since the present invention is configured as described above, it has the following effects. With the sizing center, which is movable and airtightly inserted in the spindle hole, is biased toward the chuck side by pressure air, and the work is supported between the sizing center protruding to the chuck side and the tailstock center. Since the work piece is pushed in by the tailstock and the sizing center is brought into contact with the adjusting screw of the sizing stopper for longitudinal positioning, the work piece can be easily attached and detached. Furthermore, since the engagement of the center hole is confirmed by pneumatic pressure, machining defects due to work center misalignment are eliminated, and automatic attachment / detachment by a work loader such as a robot becomes safe and reliable, which is effective for fully automatic machining of long-axis workpieces. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sizing stopper of this embodiment.

FIG. 2 is a cross-sectional view of a conventional sizing stopper.

[Explanation of symbols]

1 spindle head 2 spindle 3 chuck 8 adjusting screw 9 rotary joint 12 pressure switch 13 sizing center 14 check valve 16 tailstock 17 tailstock center 18 robot hand W work

Claims (1)

[Claims] 1. A sizing stopper having an adjusting screw for axial positioning when a shaft work is inserted into the spindle from the chuck side and attached thereto, wherein a sizing center is provided in front of the adjusting screw in the spindle hole. An in-spindle sizing stopper, which is movably directionally and airtightly fitted, and is provided with pneumatic means for urging the sizing center toward the chuck side as necessary.