JPH08174106A - Split feed bar for nc transfer press and connecting method thereof - Google Patents

Abstract

PURPOSE: To provide a split feed bar of an NC transfer press and a connecting method thereof which is able to stop in advance without giving load to a machine at the time of mistaking the position of a split feed bar of the connecting side to set at the time of connecting the split feed bar, and whose workability is excellent. CONSTITUTION: By being controlled with a position controller 41, a split feed bar of the driving side is raised with a lifting motor 35 to the upper limit, in this state, it is advanced to the feed direction by a prescribed amount with a feeding motor 27. Next, after it is lowered with the lifting motor 35 within the range without being into contact with the split feed bar of connecting side, a position confirming means 65 installed on the upper face of a rear end part of split feed bar 25 of the connecting side is detected with a position confirming means 59 installed on the down face of split feed bar 25 of the driving side. When being detected, it is lowered further, transferred to the clamp action and connected to the connecting side, but when being not detected, lowering is stopped and the connecting action is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split feed bar of an NC transfer press and a connecting method thereof, and more particularly to a split feed bar of an NC transfer press which is automatically connected and a connecting method thereof.

[0002]

2. Description of the Related Art As shown in FIG. 6, in a conventional transfer device 101 for a press, a feed bar 103 is divided into a plurality of parts and is removed in order to facilitate the work at the time of die replacement. . For this reason, when the feed bar 103 is set after the die change (not shown), an operator sets the divided feed bars 105 and 107 to predetermined positions and starts automatic operation.

When the automatic operation is started, a feed motor and a lift motor (not shown) of the transfer device 101 position the divided feed bars (hereinafter simply referred to as "driving side") 105 on the driving side at low speed in the left-right direction and up-down order. Then, the clamp ball 111 of the hydraulic clamper 109 provided in the connecting portion of the driving side 105 is fitted into the locking hole 113 provided in the connecting portion of the divided feed bar (hereinafter simply referred to as “connecting side”) 107 of the connecting side. Let Then, the hydraulic clamper 109 is operated to operate the divided feed bars 105, 10
Connect 7

Therefore, if an operator makes a mistake in setting the connecting side 107, the driving side 105 interferes with the connecting side 107. Therefore, the driving side 105 is stopped by a servo alarm (overload), or a torque limiter is attached to a servo motor (not shown). The power is cut off and stopped.

[0005]

However, in such a conventional technique, since positioning is performed at a low speed, it takes time to stop the drive side 105 in a servo alarm (overload) state. Therefore, a considerable load is applied to the machine, which may cause a failure.

Further, if the power of the servomotor is cut off and stopped by the torque limiter, the workability is not good because the setup such as origin adjustment is required again.

The object of the present invention has been made in view of such a conventional technique, and when the divided feed bars are connected, the operator bears a mistake even if the set position of the divided feed bars is connected. An object of the present invention is to provide a split feed bar of an NC transfer press that can be stopped in advance without applying pressure and has good workability, and a connecting method therefor.

[0008]

In order to achieve the above object, the divided feed bars of the NC transfer press according to claim 1 are provided so as to oppose each other for clamping and conveying a work, and each of them can be divided into a plurality of pieces. A pair of feed bars, a feed motor that reciprocally drives the feed bar in the feed direction, a lift motor that reciprocally drives the feed bar in the vertical direction, and a position control device that drives and controls each motor. In the transfer press, a clamper is provided at the tip of a drive side divided feed bar that is reciprocally driven in the feed direction and the vertical direction by the feed motor and the lift motor, and is connected to the drive side divided feed bar. Provide a clamped part at the rear end of the split feed bar on the connection side,
Position confirmation means is provided on the lower surface of the leading end of the divided feed bar on the driving side and on the upper surface of the rear end of the divided feed bar on the coupling side.

Further, in order to achieve the above-mentioned object, the method for connecting the divided feed bars of the NC transfer press according to the second aspect of the present invention is provided so as to be opposed to clamp and convey the work and can be divided into a plurality of pieces. A pair of feed bars, a feed motor that reciprocally drives the feed bar in the feed direction, a lift motor that reciprocally drives the feed bar in the vertical direction, and a position control device that drives and controls each motor. In the transfer press, the drive-side divided feed bar is raised to a predetermined height by the lift motor under the control of the position control device, and the drive-side divided feed bar provided on the lower surface of the drive-side divided feed bar tip portion is driven by the feed motor. A position confirmation means is provided on the upper surface of the rear end of the split feed bar on the connection side to confirm the position After advancing in the feed direction to a position where it can oppose the means and lowering it by a lift motor in a range that does not interfere with the split feed bar on the coupling side, if the positional relationship can be confirmed by the position confirming means, it is in the X-axis direction. After returning by a predetermined amount, the clamper is further lowered to operate and connect, but when it cannot be confirmed, the connecting operation is stopped.

[0010]

According to the NC transfer press of the first aspect of the present invention, a pair of feed bars provided so as to be freely divided into a plurality of portions clamp a work and carry out a predetermined press work while conveying the work. The feed motor that reciprocally drives the feed bar in the feed direction and the lift motor that reciprocally drives the feed bar in the vertical direction are controlled by a position control device. In this split feed bar of the NC transfer press, a clamper is provided at the tip (end in the feed direction) of the drive-side split feed bar that is reciprocally driven in the feed direction and the vertical direction by a feed motor and a lift motor. Since the clamped portion is provided at the rear end portion (the end portion on the side opposite to the feed direction) of the side divided feed bar, it is possible to connect a plurality of divided feed bars one after another. Further, since the position confirming means is provided on the lower surface of the front end of the divided feed bar on the driving side and the upper surface of the rear end of the divided feed bar on the coupling side, the position control device determines the position of the divided feed bar when the position is confirmed. Can be judged to be correct. Therefore, the position control device controls to shift to the clamp operation only in this case, and stops the connecting operation when it cannot detect.

According to the method for connecting the divided feed bars of the NC transfer press according to the second aspect, the position control device controls the lift motor and the feed motor so as to perform the following steps. That is, the drive-side divided feed bar is once raised to a predetermined height by the lift motor, and this height is maintained, and the position confirmation means provided on the lower surface of the tip of the drive-side divided feed bar and the connected-side divided feed bar. The feed motor advances the feed direction to a position where the position confirmation means provided on the upper surface of the rear end of the bar can confirm each other. Next, after being lowered by the lift motor to a predetermined position in a range where the two divided feed bars do not interfere with each other, the position confirmation means confirms the position. If the position is confirmed, the split feed bar on the drive side is returned by a predetermined amount in the counter-feed direction and then further lowered to move to the clamp operation to connect with the connecting side. Stop and stop the linking operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows an example of the NC transfer press 1. This NC transfer press 1
Has an eddy current unauthorized speed change motor 3,
A flywheel 5 is connected to the eddy current continuously variable transmission motor 3. A slider 7 is movably provided on the flywheel 5 through vertical movement means such as a crankshaft and a connecting rod (not shown). A mold 9 (see FIG. 5) is attached to the slider 7. There is.
Further, the flywheel 5 has a plurality of rotary cams 1
1, 11 are connected, and each rotary cam 11, 1
Limit switches 13 and 13 are attached corresponding to No. 1, and signals of the limit switches 13 and 13 are sent to the press control device 15 to set the press angle.

The operation of the eddy current continuously variable transmission motor 3 is controlled by a motor controller 17 in the press controller 15. The press control device 15 controls starting and stopping of the NC transfer press 1, and a push button switch 19, a pilot lamp 21 and the like are connected to the press control device 15.

Therefore, the motor controller 17 controls the eddy current continuously variable transmission motor 3 to rotate the flywheel 5 to rotate the flywheel 5 to move the slider 7 up and down, and the die 9 presses.

Referring also to FIG. 5, the transfer device 23 has a pair of feed bars 25, which are not shown, each having a work clamp claw and facing each other.

The feed bar 25 has a feed direction (X
It can reciprocate in the axial direction) and can approach and separate in the clamping direction (Y-axis direction) for clamping and unclamping the workpiece, and the pair of feed bars 25 can be integrated in the vertical direction (Z-axis direction). It is freely movable in parallel.

Therefore, the feed bars 25 approach each other to clamp the workpiece, and in this state, the workpiece is parallel-moved upward and moved forward in the feed direction by a predetermined distance, then translated downward, and separated from each other to unclamp the workpiece. , And then retracts in the reverse feed direction and returns to the original position. The work is transferred by repeating this series of operations.

The forward and backward movements of the feed bar 25 in the feed direction are performed by rotating the X-axis feed screw 29 by the forward and reverse rotation drive of the feed motor 27. Further, the reciprocating movement of the feed bar 25 in the clamping direction is performed by driving the clamping motors 31 and 31 in the forward and reverse directions to drive the Y-axis feed screw 3
3,33. Further, the reciprocating movement of the feed bar 25 in the vertical direction is performed by the Z-axis feed screws 37, 37 by the forward and reverse rotation driving of the lift motors 35, 35. The position confirmation limit switch 39 is used when returning the origin of the feed motor 27.

Operation of the feed motor 27, the clamp motors 31, 31, and the lift motors 35, 35 is controlled by a position controller (CNC) 41.

The position control device 41 inputs information indicating the rotation angle of the crankshaft, that is, the press crank angle by the encoder 43, executes the registered synchronous operation program in the synchronous operation mode, and detects the encoder 43. Feed motor 27, clamp motors 31, 31, and lift motor 3 in synchronization with the press crank angle.
Each operation of 5, 35 is automatically controlled. Further, in the asynchronous operation mode, the operation of each of the feed motor 27, the clamp motors 31, 31, and the lift motors 35, 35 is controlled regardless of the press crank angle. This program switching is performed by the press controller 15.

A keyboard 45 and a CRT 47 are connected to the position control device 41. The movement amount of the feed bar 25 in each direction, that is, the movement amount of each motor is input by the keyboard 45, and the CRT 47 is fed to the feed bar 25.
The moving position of is displayed in real time.

The display items of the moving position of the feed bar 25 by the CRT 47 are a feed amount, an inner width interval dimension, and a lift amount. The feed amount and the lift amount are displayed in the feed bar in each machine coordinate system from the origin position. 25 is a numerical display of the absolute movement amount of 25, and this display is performed based on the rotational position detected by the rotary encoder 49 connected to the feed motor 27 and the lift motors 35, 35.

The motor controller 17 of the press control device 15 is connected to the position control device 41 via the A / D converter 51 and the D / A converter 53, and exchanges data to adjust the press crank angle. It is carried out.

Referring to FIG. 1, the feed bar 25 is divided into a plurality (here, three) in consideration of workability at the time of mold replacement, and the tip of the divided feed bar 25M on the driving side (feed direction). A hydraulic clamper 57 having a clamp ball 55 at the tip is attached to the front side), and a position confirmation sensor 59 as a position confirmation means is attached to the root portion of the hydraulic clamper 57, that is, the lower surface of the tip of the feed bar 25. There is.

On the other hand, at the rear end portion (the end portion on the side opposite to the feed direction) of the divided feed bar 25F on the connecting side, the clamp ball 55 of the hydraulic clamper 57 described above serves as a clamped portion for fitting and locking. A joint portion 63 having a locking hole 61 is provided, and a position confirmation dog 65 as a position confirmation means is provided at the root portion of the joint portion 63, that is, the upper surface of the tip end portion of the feed bar 25.

Therefore, except for both ends, each divided feed bar 2
5, a locking hole 61 and a position confirmation dog 65 are provided at the end portion on the drive side (left front side in FIG. 1), and the connection side (right side in FIG. 1).
Is provided with a clamp ball 55 and a position confirmation sensor 59.

Next, referring also to FIGS. 1 to 3, 3
A method for connecting the split feed bars will be described.

First, the divided feed bar 25F on the connecting side is set at a predetermined position. Then, the lift motor 35
Is driven to move the divided feed bar 25M on the drive side to the Z axis upper limit (predetermined height) (step S1), the feed motor 27 is driven, and the position confirmation sensor 59 can face the position confirmation dog 65. Forward to the position (step S
2) Then, the lifting motor 35 again moves downward in the Z-axis direction within a range that does not interfere with the coupling side (step S3, FIG. 3).
State). These movement points are programmed in the position control device 41 in advance.

The detection range (error) is determined by the shape of the hydraulic clamper 57, but if the position confirmation sensor 59 cannot detect the position confirmation dog 65 (step S).
4) Then, the CRT 47 displays that the position is displaced (step S5) and stops. Alternatively, a display lamp may be provided instead of the CRT 47 to display the positional deviation.

On the other hand, when the position confirmation sensor 59 detects the position confirmation dog 65 (step S4), a predetermined amount in the X-axis direction, that is, the clamp ball 55 is the locking hole 61 on the connecting side.
To the position opposite to (step S6). This is because the position confirmation sensor 59 cannot be attached to the tip of the clamp ball 55, and therefore it is necessary to once go over a predetermined amount. Next, the clamp ball 55 is moved down by a predetermined amount in the Z-axis direction to fit the clamp ball 55 into the locking hole 61 (step S7), and the hydraulic clamper 57 is operated to drive the split feed bar 25M on the drive side and the split feed bar on the connection side. 25F are connected (step S8).

Split feed bar 2 connected through the above steps
5M and 25F are newly set as the drive side, and the next divided feed bar 25F is set as the connection side, so that the divided feed bars 25 are connected one after another by repeating the above steps.

Thus, the divided feed bar 2 on the driving side
A position confirmation sensor 59 is attached to the lower surface of the 5M, and a signal indicating whether or not the position confirmation sensor 59 has detected the position confirmation dog 65 provided on the upper surface of the divided feed bar 25F is transmitted to the position control device 41. If it cannot be detected, it is determined that the position is not proper and the operation is stopped. If it is detected, the predetermined connecting operation is performed.

Therefore, since interference can be avoided in advance, it is possible to prevent machine failure and
Workability is improved because there is no need to perform home return again.

Further, since the driving side has gone too far in the feed direction and then returned in the reverse feed direction by a predetermined amount, even if the sensor cannot be attached to the tip of the clamper as described above, the clamp ball 55 is locked in the locking hole 61. Can be fitted to.

Even in such a joining method, since the conventional motors 27 and 37 and the position control device 41 can be used, the split feed bars can be automatically connected only by changing the operating method.

The present invention is not limited to the above-mentioned embodiment, but can be carried out by appropriately changing it. That is, in the above embodiment, the feed bar 25 is divided into three parts.
However, even if the number of divisions is arbitrary, it is possible to automatically connect by repeating exactly the same steps.

Further, although the combination of the position confirmation sensor 59 and the position confirmation dog 65 is used as the position confirmation means, it is not limited to this. That is, it does not matter whether the light sensor, the proximity switch, the touch switch, or the like is in contact or not.

[0039]

The split feed bar of the NC transfer press according to the first aspect of the present invention has the structure as described above, and the split drive bar is reciprocally driven in the feed direction and the vertical direction by the feed motor and the lift motor. A clamper is provided at the tip of the feed bar, a clamped part is provided at the rear end of the split feed bar on the coupling side, and the position is confirmed on the lower surface of the tip of the split feed bar on the drive side and the upper surface of the rear end of the split feed bar on the coupling side. Since the means is provided, when the position confirmation is performed by the position confirmation means, it can be determined that the position of the division feed bar on the connecting side is correct.

Therefore, the position control device controls to shift to the connecting operation only in this case, and the connecting operation can be stopped when the position cannot be confirmed, so that the divided feed bars on the driving side and the connecting side come into contact with each other. Can be prevented.

Further, the method of connecting the divided feed bars of the NC transfer press according to the second aspect is as described above, and the divided feed bar on the driving side is temporarily moved to a predetermined height by the lift motor under the control of the position control device. Then, while maintaining this height, the position confirmation means provided on the lower surface of the tip of the split feed bar on the drive side and the position confirmation means provided on the upper surface of the rear end of the split feed bar on the connection side mutually confirm. Go too far in the feed direction by the feed motor to the position to obtain. Therefore, even if the position confirming means cannot be directly attached to the tip of the clamper, the position of the divided feed bar can be confirmed.

Next, after being lowered by the lift motor to a predetermined position in a range where the two divided feed bars do not come into contact with each other, the position confirmation means confirms the position. If the position is confirmed, it can be judged that the set position of the split side feed bar on the coupling side is correct, so after returning the split side feed bar on the drive side by a prescribed amount in the opposite feed direction, it is further lowered to shift to the clamp operation. Connect with the connecting side. On the other hand, if the position cannot be confirmed, the divided feed bars come into contact with each other if the connecting operation is continued, so that the lowering is stopped and the connecting operation is stopped.

Therefore, even if the operator sets the position of the feed bar on the coupling side by mistake, the position is judged before the feed bar interferes, and if it interferes, the coupling operation is stopped and the machine is burdened. Since there is no need to perform the home-return operation again, the workability is not deteriorated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a split feed bar of an NC transfer press according to the present invention.

FIG. 2 is a flowchart showing steps of a method for connecting divided feed bars of an NC transfer press according to the present invention.

FIG. 3 is a side view showing a state in which the position confirmation means according to the present invention performs position confirmation.

FIG. 4 is an explanatory diagram showing the overall configuration of an NC transfer press according to the present invention.

FIG. 5 is an explanatory diagram showing an outline of a transfer device according to the present invention.

FIG. 6 is a perspective view showing a connecting portion of a split feed bar of a conventional NC transfer press.

[Explanation of symbols]

 1 NC transfer press 25 Feed bar 25M Drive side split feed bar 25F Connection side split feed bar 27 Feed motor 35 Lift motor 41 Position control device 57 Hydraulic clamper 59 Position confirmation sensor (position confirmation means) 61 Locking hole ( Clamped part) 65 Position confirmation dog (position confirmation means)

Claims (2)

[Claims] 1. A pair of feed bars, which are provided so as to face each other to clamp and convey a work and can be divided into a plurality of pieces, a feed motor for reciprocally driving the feed bar in a feed direction, and the feed bar. An NC transfer press having a lift motor that reciprocates vertically and a position control device that controls the drive of each motor, the drive being reciprocally driven in the feed direction and the vertical direction by the feed motor and the lift motor. The divided feed bar on the drive side is provided with a clamper, and the divided feed bar on the coupling side connected to the divided feed bar on the drive side is provided with a clamped portion, and the tip of the divided feed bar on the drive side is provided. Position confirmation means is provided on the lower surface and the upper surface of the rear end of the split feed bar on the connecting side. Split feed bar for NC transfer press. 2. A pair of feed bars, which are provided so as to face each other to clamp and convey a work and can be divided into a plurality of pieces, a feed motor for reciprocally driving the feed bar in a feed direction, and the feed bar. An NC transfer press having a lift motor that reciprocally drives in the vertical direction and a position control device that drives and controls each of the motors. The divided feed bar on the drive side is controlled by the lift motor to a predetermined height under the control of the position control device. The position confirmation means on the drive side provided on the lower surface of the tip of the divided feed bar on the drive side by the feed motor faces the position confirmation means on the connection side provided on the upper surface of the rear end of the divided feed bar on the connection side. The feed motor is advanced to the position where it can be moved, and the lift motor does not interfere with the split feed bar on the connection side. If the positional relationship can be confirmed by the position confirmation means after being lowered by the surroundings, after returning by a predetermined amount in the X-axis direction, it is further lowered to operate the clamper to connect, but if it cannot be confirmed, the connecting operation A method for connecting split feed bars of an NC transfer press, characterized in that