JPH05329701A - Work supporting device - Google Patents

Abstract

PURPOSE:To shorten time spent for the independent advance of a tailstock center so as to shorten cycle time by providing a controller to synchronously execute the one step advance of the tailstock center and the advance of a spindle center and to continuously execute the two step advance of the tailstock center. CONSTITUTION:First, a moving forward and backward driving device for a spindle ram 10 makes a spindle center 7 advance just before it abuts on a work 3. A moving forward and backward driving device for a tailstock ram 19 synchronously makes a tailstock center 18 execute one step advance just before it abuts on the Work 3. After the advance of the spindle center 7, the moving forward and backward driving device for a tailstock ram 19 makes the tailstock center execute two step advance to sandwichedly hold the work between the spindle center and itself. Next, the spindle center is moved forward and backward with the work supported in the above state to longitudinally position the work. Next a rotary device rotating drives the work for driving the positionedly supported work. After grinding process, the tailstock center is moved backward, and the spindle center is then moved backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supporting device for rotatably supporting a work by sandwiching the work from both sides by a headstock and a tailstock.

[0002]

2. Description of the Related Art Conventionally, as a tailstock of a work supporting device,
For example, there is one described in Japanese Utility Model Publication No. 58-41042. When the tailstock center engages with the workpiece, the limit switch is energized, and the signal is used to lock the drain oil of the cylinder that drives the tailstock ram forward and backward with an electromagnetic check valve to prevent the tailstock ram from moving forward. It is a configuration to stop.

The cycle of the conventional work supporting device using the above tailstock is as follows. First, the spindle center of the headstock is moved forward, and until the spindle center comes into contact with the workpiece, the tailstock center of the tailstock is moved forward, so that the workpiece is clamped from both sides by the spindle center and the tailstock center. .. Then, one end of the work is clamped by the work holding device on the headstock side to rotatably support the work. While supporting the work, move the spindle center back and forth,
Position the workpiece in the longitudinal direction. Next, the work that is positioned and supported is ground, and after the grinding is completed, the work clamp by the work holding device is released at the same time when the tailstock center is retracted, and then the spindle center is retracted.

[0004]

As described above, since it has been confirmed that the spindle center has moved forward until just before it comes into contact with the workpiece due to the advancement of the spindle center, the tailstock center is moved forward. Was getting longer.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a headstock and a tailstock fixed to the bed 1 so as to face each other, and the headstock body. A spindle ram that is slidably fitted to the spindle ram, has a spindle center at one end, a spindle ram advance / retreat drive device that drives the spindle ram forward and backward, and a rotation that rotatably drives the workpiece. A drive unit, a tailstock ram that is slidably fitted to the tailstock main body, and has a tailstock center at one end; and a tailstock ram advance / retreat drive device that drives the tailstock ram forward / backward. By moving the spindle ram and the tailstock ram forward with respect to the workpiece placed on the temporary cradle installed on the bed between the headstock and the tailstock, the spindle center and the tailstock center are moved from both sides. Abut and support the workpiece rotatably, In the work supporting device that rotationally drives the work by the rotation driving device, the tailing ram advance / retreat driving device advances the tailing center of the tailstock in one step forward until just before contacting the work, It has a two-step forward function of advancing to a forward end position where it abuts against the work in two-step forward movement and clamps the work with the spindle center of the headstock, one step forward movement of the tailstock center and forward movement of the spindle center. Is performed in synchronism with each other, and subsequently, a control device for performing control to move the tailstock center forward by two steps is provided.

[0006]

With the above construction, first, the main shaft ram advance / retreat drive unit moves the main shaft center forward until just before contacting the work. In synchronism, the tail ram advance / retreat drive device moves forward one step until just before the tail center comes into contact with the workpiece. After the completion of the advancement of the spindle center, the tailstock ram advance / retreat drive device moves the tailstock center forward by two steps, and holds the work from both sides with the spindle center. Next, with the work being supported, the spindle center is moved back and forth to position the work in the longitudinal direction. Next, the work is rotationally driven by the rotation driving device, and the work positioned and supported is ground. After grinding is completed, the tailstock center is retracted, and then the spindle center is retracted.

As described above, the forward movement of the spindle center and the forward movement of the tailstock center by one step, that is, the forward movement just before the contact with the workpiece, are performed in synchronization, and then the tailstock center is moved forward by two steps. Since the work is clamped from both sides, the time spent for advancing the tailstock center alone can be shortened and the cycle time can be shortened.

[0008]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 is a bed, and a temporary cradle 2 is provided on the bed 1.
Is installed, and the work 3 is placed on the temporary receiving table 2. A headstock 4 and a tailstock 5 are fixedly provided on the bed 1 so as to face each other with the work 3 interposed therebetween.

Reference numeral 4a denotes a headstock main body, and a main spindle ram 6 is slidably fitted in the main spindle stock main body 4a, and a main spindle center 7 is fitted to the tip of the main spindle ram 6. The main spindle ram 6 is fixed to a ball screw nut 8 and is driven to move back and forth by a forward / backward drive motor 10 installed on the headstock main body 4 a via a ball screw 9. Also, the spindle ram 6
A work holding device 11 is installed at the tip of the work holding device 11. In the work holding device 11, the face plates 12a and 12b are respectively gripped by the connecting bars 13a and 13b.
face plate 12b by a device (not shown)
When the face plate 12a is relatively rotated with respect to the face plate 12b, the grip claws 14b swing around the pin 14c, and the work 3 is clamped and unclamped. The face plate 12a is a spindle gear 1 rotatably installed on the main body 4a of the spindle via the face plate 12c.
5, the spindle gear 15 is attached to the headstock main body 4a.
It is adapted to be rotationally driven by a rotary motor 16 installed at.

Reference numeral 5a denotes a tailstock main body. A tailstock ram 17 is slidably fitted to the tailstock main body 5a. A tailstock center 18 is fitted to the tip of the tailstock ram 17. There is. Also,
Reference numeral 19 is a cylinder formed on the tailstock main body 5a along the tailstock ram. In this cylinder 19, a piston 20a,
20b, 20c are fitted and inserted into the oil chambers 21a, 21
b, 21c, 21d are formed. 22 is a piston 20
It is a pilot bar which is integral with b and slidably penetrates through the piston 20a. A dog 23a is provided at the rear end of the pilot bar 22, and when the tailstock center 18 is moved forward by one step, the piston 20b is at the rearward end position to stop the tip of the tailstock center 18 immediately before the work 3. Dog 23a
The proximity switch 24a is provided at a position where it is turned on. In addition, the tail end ram 17 is provided at the rear end of the piston 20a.
A shaft 26, which is fitted to the rear end of the spring 25 via a spring 25 so as to be relatively movable in the axial direction, is connected by a connecting member 27. A dog 23 b is provided at one end of the connecting member 27 to allow the piston 20 to move when the tailstock center 18 moves forward one step.
The proximity switch 24b is provided at a position where it is turned on by the dog 23b at a position where a moves forward and comes into contact with the piston 20b at the reverse end to stop the piston 20a.

23c, 23d and 23e are tailstock rams 1, respectively.
The dogs provided in 7 are the dogs 23c, 23d, 23
Corresponding to each of e, the tail switch ram 17 is turned on by the dog 23c at the backward movement end position, and the proximity switch 24c is turned on by the dog 23d at the one-step forward position of the tail ram 17, and the proximity switch 24d is turned on. , Proximity switch 2 to the position where it is turned on by the dog 23e at the forward end position of the tailstock ram 17.
4e are provided respectively. Also, when the tailstock ram 17 moves too far, the dog 23d causes the proximity switch 2 to move.
4c is turned on.

28 is a hydraulic pump, 29 is a hydraulic pump 2
8A is an electromagnetic directional control valve for switching and supplying the pressure oil from 8 to the oil chambers 21a, 21b of the cylinder 19 and for switching and discharging from the oil chambers 21a, 21b to the tank 31, and 29A is the piston 2
0a is the forward port and 29B is the backward port. Further, 30 switches and supplies the pressure oil from the hydraulic pump 28 to the oil chambers 21c and 21d of the cylinder 19, and the oil chambers 21c and 2d.
An electromagnetic directional switching valve for switching and discharging from 1d to the tank 31, 30A is a forward port of the piston 20b, 30B is a backward port, and 30c is a discharge port from the oil chambers 21c and 21d.

DU1 is a drive unit for the electromagnetic directional control valve 29, DU2 is a drive unit for the electromagnetic directional control valve 30, DU3 is a drive unit for the forward / backward drive motor 10, and DU4 is a drive unit for the rotary motor 16. is there.
Reference numeral 32 denotes a control device, which is a central processing unit (CPU) 32a.
, Interface (IF) 32b, and memory 32c
In the memory 32c, a machining program for performing a predetermined machining by a machining device (not shown) on the work 3 supported by the work supporting device and a work support for supporting the work 3 by the work supporting device. The program is stored. This controller 32
Are proximity switches 24a, 24b, 24c, 24d, 24
The work supporting program is executed based on the signal of e.
That is, the positions of the tailstock ram 17 and the pistons 20a, 20b are checked at any time, and the electromagnetic direction switching valves 29, 30, the advancing / retreating drive motor 10, and the rotary motor 16 are controlled.

Next, the operation of the above configuration will be described.
With the spindle center 7 of the headstock 4 in the backward movement end position and the tailstock center 18 of the tailstock 5 in the backward movement end position, the work 3 is placed on the temporary support 2 installed on the base 1. Here, in the tailstock 5, the electromagnetic directional control valve 29 has the reverse port 29B.
Thus, pressure oil is supplied from the pump 28 to the oil chamber 21b, the piston 20a is positioned at the rearward end, and the electromagnetic directional control valve 30 is supplied to the other oil chamber at the discharge port 31c. Absent.

In this state, the work support program stored in the memory 32c is executed by the controller 32. First, the spindle center 7 of the spindle stock 4 is moved forward and backward by the drive motor 1.
By 0, it advances by a predetermined amount, and advances until just before contacting the work 3. At the same time, in the tailstock 5, the electromagnetic directional control valve 29
Is switched to the forward port 29A, the electromagnetic direction switching valve 30 is switched to the reverse port 30B, and pressure oil is supplied from the pump 28 to the oil chambers 21a and 21c, so that the piston 20a is positioned at the reverse end. The tailstock center 18 moves to the position where the work 3
Move one step forward until just before touching.

Next, in the tailstock 5, the electromagnetic direction switching valve 29 is switched to the forward port 29A, the electromagnetic direction switching valve 30 is switched to the discharge port 30c, and pressure oil from the pump 28 is transferred to the oil chamber 2.
By being supplied to 1a, the piston 20a and the piston 20b integrally move forward. While the piston 20b moves to the forward end, the tailstock center 18 abuts on the work 3, and the shaft 26 further advances in a state where the tailstock center 18 abuts on the work 3, so that the tailstock ram 17
The pressing force of the spring 25 inserted therein increases, and the piston 20b has the pressing force of the spring 25 at the forward end position.
The tailstock center 18 presses the work 3 toward the spindle center 7. Here, the pressing force of the spring 25 is increased in order to support the work 3 against a large load generated between the work 3 and a grindstone (not shown) at the time of rough machining. In addition, at the time of finishing, the electromagnetic directional control valve 29
Is the forward port 29A, the electromagnetic directional control valve 30 is switched to the forward port 30A, and the pressure oil from the pump 28 causes the piston 20c to retract by a predetermined amount, so that the tailstock center 18 is in contact with the work 3 and the shaft 26 is retracted, the pressing force of the spring 25 is reduced, and the strain of the work 3 is reduced.

Next, the work holding device 11 installed on the headstock 4 is actuated to grip the work 3 by the claws 14a and 14b.
Then, the spindle center 7 is advanced and retracted while the work 3 is supported, and the work 3 is positioned in the longitudinal direction by an end face measuring device (not shown). In this way, the work 3 positioned and supported is processed according to the processing program. After the machining is completed, the work holding device 11 of the headstock 4 unclamps the work 3, the tailstock center 18 is retracted at the same time, and then the spindle center 7 is retracted to complete the entire program.

As described above, the forward movement of the spindle center 7 and the forward movement of the tailstock center 18 by one step, that is, the forward movement until just before contacting the work 3, are performed in synchronization with each other.
Since the work 3 is moved forward by two steps so as to clamp the work 3 from both sides, the time spent for the forward movement of the tailstock center 18 alone can be shortened, and the cycle time can be shortened. In addition,
In the above embodiment, in order to rotate the work 3,
The work holding device 11 is provided at the tip of the main spindle ram 6, and the work 3 is held by the work holding device 11 and the work 3 is rotationally driven by the rotary motor 16. The flange portion 40a as shown in FIG. In the case of the work 40 having the work 40, the rotating member 41 having the drive pin 41a protruding in the longitudinal direction of the work 40 is rotatably fitted to the main spindle ram 6, and the work 40 is sandwiched by the main spindle center 7 and the tailstock center 18. In the case of rotating the work 40 by engaging the drive pin 41a in the fitting hole formed in the flange portion 40a and rotating the rotating member 41 by the rotation motor 16, Of the tailstock ram 17 and the one-step forward movement of the tailstock ram 17 are carried out in synchronization with each other.
May be advanced two steps.

Further, in the above two-step forward movement of the tailstock ram 17 of the tailstock 5, in the above, the pistons 20a, 20b, 20c are fitted and inserted into the cylinder 19 formed along the tailstock ram 17, and the piston 20a. , 20b, 20c and the cylinder 19, the pressure oil supplied to the oil chamber is switched and controlled. However, as shown in FIG.
2 and the ball screw 43 are used to connect the connecting member 27 and the ball screw nut 44, and the NC ram is used to synchronize the forward movement of the main spindle ram 6 and the forward movement of the tailstock ram 17 by one step. You may move it forward two steps. To confirm the one-step forward position of the tailstock ram 17, check the dog 23d and the proximity switch 24.
After confirming the completion of the advance of the spindle ram 6, the two-step advance command of the tailstock ram 17 is given to the servomotor 42.

[0020]

As described above, according to the present invention, the trailing ram advance / retreat drive device advances the tailstock center of the tailstock by one step forward until just before contacting the workpiece. Two
It has a two-step forward function of advancing to the forward end position where it abuts against the work in stepwise advance and clamps the work by the spindle center of the headstock, and synchronizes the one-step advance of the tailstock center and the advance of the spindle center. Then, move the tailstock center two steps forward,
Since the work is clamped from both sides, the time spent for advancing the tailstock center alone can be shortened and the cycle time can be shortened.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

1 bed 2 temporary support 3 work 4 headstock 5 tailstock 6 spindle ram 7 spindle center 8 ball screw nut 9 ball screw 10 advancing / retreating drive motor 11 work holding device 12a, 12b, 12c face plate 13a, 13b connecting bar 14a, 14b Grip claw 14c Pin 15 Main shaft gear 16 Rotary motor 17 Tailstock ram 18 Tailstock center 19 Cylinders 20a, 20b, 20c Pistons 21a, 21b, 21c, 21d Oil chamber 22 Pilot bar 23a, 23b, 23c, 23d, 23e Dog 24a, 24b, 24c, 24d, 24e Proximity switch 25 Spring 26 Shaft 27 Connecting member 28 Hydraulic pump 29, 30 Electromagnetic directional control valve 31 Tank

Claims (1)

[Claims] 1. A headstock and tailstock fixed to a bed 1 so as to face each other, a spindle ram slidably fitted to the headstock body, and having a spindle center at one end, and this spindle ram. And a drive device for the spindle ram that drives the ram forward and backward, a rotary drive device that is rotatably provided on the headstock and that drives the workpiece to rotate, and is slidably fitted to the tailstock body, and has a tailstock at one end. A tailstock ram having a center and a tailstock ram advancing / retreating drive device for driving the tailstock ram forward / backward are provided, and the tailstock ram is mounted on a temporary pedestal installed on a bed between the headstock and the tailstock. The spindle ram and the tailstock ram are moved forward with respect to the formed work to bring the spindle center and the tailstock center into contact with each other from both sides to rotatably support the work, and the work is rotationally driven by the rotation drive device. In the work supporting device, The ram advance / retreat drive device advances the tailstock center of the tailstock by one step forward until just before contacting the work piece, and contacts the work piece by two step forward movement to bring the work piece into contact with the headstock center of the headstock. A control that has a two-step forward function of advancing to the clamped forward end position, performs the one-step advance of the tailstock center and the advance of the spindle center in synchronization, and then performs the two-step advance of the tailstock center. A work supporting device having a control device for performing the work.