JPS6336860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving device used for moving a carriage or the like that clamps a work plate in a plate bending machine and inserts the work plate into the plate bending machine, and the moving speed thereof is high and the movement speed is high. It is an object of the present invention to provide a moving device with high positioning accuracy of a stop position after movement.

In other words, in a combination of a ball screw that is generally used for moving and positioning an object and a slider screwed onto the ball screw, the slider is moved by the rotation of the ball screw, and the object that is integrally fixed to the slider is moved to a predetermined position. Since it is moving, the movement and positioning can be performed in one stroke, which has the advantage of simplifying the device, but on the other hand, since both movement and positioning are performed in one movement, the positioning accuracy decreases. It was impossible to increase movement speed without inviting

This invention makes it possible to achieve both high moving speed and high stop positioning accuracy by performing the above-mentioned movement and positioning using separate means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a carriage moving device of the present invention is attached to a carriage for inserting and supplying a work plate to a plate bending machine will be described below with reference to the drawings.

Figures 1 and 2 are a schematic plan view and a front view of the entire plate bending machine, respectively, and Figure 3 is a schematic side view with some parts omitted. A conveyor device for carrying the work plate on the work plate mounting table 1, which is provided continuously to the work plate supply and conveyance device 3 across the work plate mounting table 1, and is raised and lowered by the lifting device 4. Yotte table 1
The work plate W carried to the center is clamped by a carriage 6 equipped with a moving device 5 of the present invention, moved forward, and inserted into the plate bending machine main body 7.

In addition, 8 is the bending blade of the plate bending machine main body 7, and 9
1 is a counter blade, and 11 is a blank holder. These devices 8, 9, and 11 constitute a bending section.

Next, the carriage 6 will be explained in detail.

In Figure 4 and below, 12 is the base frame 1
3 is a guide groove for the carriage 6 extending in the front-rear direction.
The entire carriage 6 is guided by rollers 14 provided therein, so that the entire carriage 6 is freely movable in the front-rear direction, that is, in the direction of moving the work plate W forward and backward with respect to the bending portion. Then, the carriage 6 is connected to its arm portion 6.
A clamping device 15 is provided at the front end a and the front end of the lower part 6b, and the work plate W can be clamped by the clamping device 15 as well.

The clamp device 15 has an upper clamp head 1
5a is adapted to move up and down by a hydraulic cylinder 16, and the lower clamp head 15b
has two hydraulic cylinders 1 on the base end side of the shaft 17.
The lower clamp head 15b does not move up and down, but rotates at 90 degrees or 180 degrees when the work plate W is held between it and the upper clamp head 15a. The workpiece plate W is rotated by 30 degrees, and each side of the workpiece plate W can be turned toward the plate bending machine main body 7 side in turn. 22 is an index spin device. The various devices described above are mounted on the carriage 6 and move as the carriage 6 moves.Next, the moving device for the carriage 6 will be explained.

In FIG. 5, 23 has bearings 24 and 25 at both ends.
The ball screw shaft 23 extends in the front-rear direction parallel to the moving direction of the carriage 6, and one end thereof is directly connected to a DC servo motor 27 via a coupling ring 26. has been done. and the ball screw shaft 2
A slider frame 28 is screwed onto the ball screw portion 23a of No. 3, and is configured to move back and forth as the ball screw shaft 23 rotates. 13a is a guide rail for the slider frame 28 formed on the frame, and 29 is a rotation prevention device for the ball screw shaft 23 provided on the base end side of the ball screw shaft 23, which is a block that sandwiches the ball screw shaft 23 from the left and right sides. 3
1, 32, a locking means 37 consisting of a bolt 33 fixed to one block 32, a nut 34, a receiver 35 provided on the other block 31, and a bellows spring 36 interposed between the nut 34 and the receiver 35; Releasing means of locking means 37, ie block 3
1 and 32 and a hydraulic cylinder 38 that opens left and right. And the rotation prevention device 2
9, before the servo motor 27 is rotated, the hydraulic cylinder 38 is extended to block the blocks 31 and 32.
When the rotation lock is released and the servo motor 27 has finished rotating and the slider frame 28 has moved to the predetermined position, the hydraulic cylinder 38 is opened again.
is contracted, and the elastic force of the plate spring 36 locks the rotation.

The above ball screw shaft 23, servo motor 27,
Although the slider frame 28 also constitutes a positioning means for the carriage 6, the driving means provided at the bottom of the carriage 6 will be explained next.

That is, at the bottom of the carriage 6 there is a hydraulic cylinder 41 for retracting the carriage, whose rod 41a end is fixedly connected to the slider frame 28, and whose cylinder 41b side is fixed to the carriage 6, and its rod 42.
The a end is fixedly connected to the frame 13, and the cylinder 42
A carriage advance hydraulic cylinder 42 whose b side is fixed to the carriage 6 is provided. 43,44
are ports on the pressure oil inflow side, 45 and 46 are ports on the outflow side, and 47 and 48 are check valves. Narrow passages 51 and 52 communicating with the oil chamber are formed. Note that 53 is a bracket protruding from the slider frame 28 for connecting the rod 41a.

Next, to explain the hydraulic circuit of the hydraulic cylinders 41 and 42, in FIG. 9, 54 and 55 are three-position directional control valves, 56 and 57 are two-position directional control valves, 58 and 59 are relief valves, 61, 62 is a check valve, and if the switching valves 56 and 57 are switched to the right in the drawing, and the switching valves 54 and 55 are switched to the right,
Pressure oil is supplied into the hydraulic cylinder 41 through the check valve 47, and the rod 41 is moved by the movement of the slider frame 28.
Smooth elongation of a. When the rod 41a contracts, the pressure oil in the hydraulic cylinder 41 is freely discharged via the check valve 62.

Further, when the switching valves 54 and 55 are switched to the left in the drawing, pressure oil is supplied into the hydraulic cylinder 42 through the check valve 48, and the rod 42a is extended to advance the carriage 6 to a predetermined position. rod 42a
When contracted, the hydraulic cylinder 42 passes through the check valve 61.
The pressure oil inside is freely discharged.

When the rod 41a is extended, the hydraulic circuit 63 is connected to a relief valve (not shown) by switching a switching valve on the side of the hydraulic pressure source (not shown) to keep the pressure in the circuit low. 41a
When the slider frame 28 is extended, that is, when the slider frame 28 is moved, high pressure is applied to the slider frame 28 in the front and rear direction, so that the positioning accuracy does not deteriorate.

A plate bending machine equipped with a carriage moving device according to the present invention is configured as described above, so that the work plate is conveyed to a central position on the mounting table 1 by the supply conveyance device 3 and the conveyor device 2. The work plate W that has been bent is clamped by the clamping device 15 of the carriage 6 as described above, and as the carriage 6 moves back and forth, it is inserted into and pulled out into the plate bending machine main body 7, and the clamping device The work plate is rotated by the rotation of 15, and the carriage 6 is moved back and forth in the following manner.

That is, first, after the rotation stopper 29 is released as described above, a signal is sent to the servo motor 27 to rotate it a predetermined number of times, and the slider frame 28 is advanced to a position where the carriage 6 is desired to be stopped.
Along with the above operation, the rod 41a of the hydraulic cylinder 41 is extended by being pulled by the slider frame 28.
(FIG. 10B) After the slider frame 28 is accurately positioned and stopped at the desired stop position of the carriage 6 as described above, the directional control valves 54 and 55 are switched to extend the hydraulic cylinder 42. The carriage 6 advances at once (approximately 100 m/min) to the forward position predetermined by the slider frame 28 (10th
Figure C). The other hydraulic cylinder 41 is then free to retract and reach its minimum length, i.e. the rod 4
1a sinks to the deepest part within the cylinder tube 41b, and therefore, the stopper for the carriage 6 is the base end of the rod 41a of the hydraulic cylinder 41 and the cylinder 41.
The bottom part b and the slider frame 28 act, but once the ball screw shaft 23 has finished rotating as described above, the block 31 of the rotation stopper 29,
32, the position will not shift due to impact when stopped. Further, since the bearing 24 on the front side of the ball screw shaft 23 is a load-bearing bearing, the positioning accuracy is also increased by this.

When the carriage 6 is retracted and returns to its original position (neutral position), the hydraulic cylinder 41 is extended, the hydraulic cylinder 42 is contracted, and the carriage 6 returns to its original retracted position. At that time, the stopper is the rod 42a of the hydraulic cylinder 42.
The base end and the bottom of the cylinder 42b act (first
Figure 0 D).

Finally, the ball screw shaft 23 is reversely rotated to return the slider frame 28 to its original retracted position (10th
Figure A).

As is clear from the above description, the moving device of the present invention includes a ball screw rotated by a servo motor, a slider screwed onto the ball screw, and a rotation stopper that prevents free rotation of the ball screw. Since it is constituted by two separate means: a positioning means and a driving means consisting of two hydraulic cylinders for advancing and retracting the carriage disposed between the frame and the carriage and between the carriage and the slider, The positioning accuracy of the carriage is high, and once the positioning is done with the slider, the rest is
The carriage is moved all at once by a hydraulic cylinder, so the moving speed is fast (100m/cm in the example).
min), the time for moving the slider and pre-positioning is not included in the actual stroke time, so the actual cycle time can be shortened.

Further, since the servo motor only rotates the ball screw rather than directly moving the carriage with the motor, the motor capacity may be small.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a plate bending machine equipped with a carriage moving device of the present invention, FIG. 2 is a schematic front view of the same, and FIG. 3 is a schematic side view with a portion omitted.
Fig. 4 is a sectional view showing the moving device at the bottom of the carriage (the cross section is taken along the - line in Fig. 3), Fig. 5 is a side view of the positioning means, Fig. 6 is a sectional view of the rotation stopper, and Fig. 7 is a sectional view of the moving device at the bottom of the carriage. Fig. 5 is a view taken along the - line arrow; Fig. 8 is a cross-sectional plan view showing the drive means at the bottom of the carriage;
FIG. 9 is a hydraulic circuit diagram of the driving means, and FIG. 10 is an explanatory diagram of the operation of the carriage. 5... Carriage moving device, 6... Carriage, 13... Frame, 23... Ball screw, 2
7... Servo motor, 28... Slider, 29...
... Anti-rotation device, 41... Hydraulic cylinder for backward movement, 42... Hydraulic cylinder for forward movement.

Claims (1)

[Scope of Claims] 1. In a plate bending machine, a moving device for a plate material carriage that advances and retreats the plate material to a bending section of the main body of the plate bending machine and holds the plate material in position, the moving device positioning the stop position of the carriage. It consists of a positioning means and a driving means for advancing the carriage to a stop position determined by the positioning means and retracting it to a neutral position, and the positioning means is constructed on a base frame and drives the carriage forward and backward. A rotatable ball screw that extends along a direction, a slider screwed onto the ball screw, a servo motor for driving the rotation of the ball screw, and a servo motor that prevents free rotation of the ball screw while the servo motor stops rotating. The driving means is disposed between the carriage and the base frame, and the driving means is a forwarding hydraulic pressure that extends between the carriage and the base frame to advance the carriage with respect to the base frame at a fixed position. It consists of a cylinder, and a backward hydraulic cylinder, which is disposed between the above-mentioned carriage and the slider, and which moves the carriage backward with respect to the slider in the fixed position by extending between the carriage and the slider. When the hydraulic cylinder extends, the backward hydraulic cylinder freely contracts to reach the minimum length, and when the backward hydraulic cylinder extends, the forward hydraulic cylinder freely contracts and reaches the minimum length. A carriage moving device for a plate bending machine, characterized in that the carriage is set in a cylinder that reaches .