JP2503337B2 - Hydraulic press - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press, and more particularly to a hydraulic press provided with a work holder for holding a plate and a hydraulic head for processing the held plate.

[0002]

2. Description of the Related Art In recent years, as a turret punch press machine for punching and drawing a plate material, a hydraulic drive type machine using a hydraulic cylinder as a drive source has been used. In the punch press machine, since the hit rate of the mold is extremely high, such as several hundreds per minute, conventionally, the punch press machine has been limited to the crank type machine using a motor as a drive source. However, due to improvements in the hydraulic system, high-speed operation has become possible, and hydraulic punch press machines have been used.

In this type of hydraulic punch press machine, since the stroke amount of the hydraulic cylinder can be adjusted, the stroke amount is minimized to improve the hit rate, and machining is performed in the same cycle as the crank type. be able to. For example, the stroke can be minimized by raising the tool to the top dead center only when exchanging the tool, and otherwise making the tool stand by at the allowable lower limit.

[0004]

In the hydraulic punch press machine, when the press working is performed with the stroke minimized, the gap between the lower surface of the tool and the table becomes smaller than that of the crank type machine. . Therefore, there is a problem of interference between the work holder that holds the plate material and the tool that engages with the tip of the hydraulic cylinder. That is, when the gap becomes small,
Since the lower surface of the tool is located below the upper surface of the work holder, the work holder may come into contact with the tool.

In order to solve this problem, it is conceivable to detect whether or not the work holder interferes with the tool during movement of the tool by the work holder, and change the stroke of the hydraulic cylinder when this is detected. . However, if the interference of the work holder is detected or the stroke of the hydraulic cylinder is changed during the movement, various control routines are required for that purpose and the machining time becomes long.

An object of the present invention is to shorten the machining time and prevent the work holder from interfering with the hydraulic head.

[0007]

SUMMARY OF THE INVENTION A hydraulic press according to the present invention includes a work holder for gripping and positioning a plate material, and a lift.
In a hydraulic press equipped with a hydraulic head that reciprocally drives between an end and a descending end to process a plate material held by the work holder, a hydraulic press for positioning the work holder with the hydraulic head is used. Interference determination means for determining the possibility of interference, and this interference determination means determine that there is no possibility of interference.
The rising end to the falling end of the hydraulic head
And the plate holder positioning operation of the work holder
And the possibility of interference by the interference determination means.
When it is determined that there is a plate material by the work holder
Wait for the positioning operation to complete before starting the lowering operation.
As described above, the control means for controlling the hydraulic head and the work holder is provided. Processing program consisting of multiple lines
A read-ahead means that reads ahead the line following the line being processed on the ram.
Comprising the al, the interference determination means, based on the pre-read result of the read-ahead means may be one that determines the possibility of the interference. Also, a predetermined standby position between the rising end and the falling end
Whether or not the tip of the hydraulic head on the way down
A head position determining means for determining
Means means that there is no possibility of interference by the interference determination means
Parallel movement of hydraulic head and plate positioning when judged
During the work process, the hydraulic
The tip of the head may not be moved downward from the predetermined standby position .

[0008]

The hydraulic press according to the present invention, sheet material by the work holder is positioned move held, the hydraulic head
Positioned by the work holder by descending from the ascending end to the descending end
The processed plate material is processed. On the other hand, the interference determination means
Interference with the hydraulic head when positioning and moving the holder
Determine the possibility of . And by this interference determination means
When it is determined that there is no possibility of interference,
Lowering operation from the ascending end to the descending end and the work holder plate material position
The determination operation is performed in parallel, and the interference determination means
When it is determined that there is a possibility, the plate by the work holder
Wait for the material positioning operation to complete before starting the descending operation
Control means controls the hydraulic head and the work holder.
It This causes the work holder to move while it does not interfere.
The hydraulic head can be lowered and the processing time can be shortened. Ma
In addition, if there is interference, the hydraulic head should be
Since the descent operation to
It is possible to reliably prevent communication. Furthermore, depending on the possibility of interference,
Regardless, move the hydraulic head between the ascending end and the descending end.
Since it only needs to be done, complicated stroke control becomes unnecessary.
It In addition, interference may occur based on the pre-reading result of the pre-reading means.
When determining the potential, ensure the possibility of interference during work.
Can judge. Furthermore, it was determined that there was no possibility of interference.
In case of parallel operation process of hydraulic head and plate material positioning
Position the tip of the hydraulic head until the plate positioning is complete.
If you do not move it below the fixed standby position,
Even if the placement takes more time than the hydraulic head lowering,
Achieves reliable plate material processing while reducing the work time as much as possible
it can.

[0009]

1 and 2 show a hydraulic punch press which is a hydraulic press according to an embodiment of the present invention. Here, a turret punch press machine is taken as an example. The punch press machine 1 is mainly composed of a lower frame 2, an upper frame 3 arranged above the lower frame 2, and a throat portion 4 for supporting the upper frame 3 at the rear. A fixed table 10 is arranged at the center of the upper surface of the lower frame 2. A pair of guide rails 5 and 6 are arranged on both sides of the upper surface of the lower frame 2. Guide rail 5,
A carriage 7 is arranged on the carriage 6 so as to be movable in the depth direction (Y-axis direction). Moving tables 8 and 9 arranged on both sides of a fixed table 10 are fixed to the carriage 7. The carriage 7 is provided with a cross slide 15 to which a pair of work holders 13 and 14 for arranging the plate material 11 are attached so as to be movable in the left-right direction (X-axis direction).

A moving mechanism for moving the carriage 7 in the Y-axis direction is arranged below the moving table 9 . The moving mechanism is composed of a servo motor 16, a ball screw 17 connected to the servo motor 16, and a ball nut 18 screwed to the ball screw 17. The ball nut 18 is fixed to the lower surface of the moving table 9. On the other hand, a moving mechanism that moves the cross slide 15 in the X-axis direction is arranged in the carriage 7. The moving mechanism includes a servo motor 20 arranged at one end of the carriage 7, a ball screw 21 connected to the servo motor 20, and a ball nut 23 screwed to the ball screw 21. The ball nut 23 is fixed to the cross slide 15.

An upper turret 12 for accommodating a plurality of punches is rotatably provided on the upper frame 3. Inside the upper turret 12, a punch head which is moved up and down by a hydraulic cylinder (FIG. 3) is provided. On the other hand, on the lower frame 2 side, a lower turret 22 that houses a plurality of dies is arranged to face the upper turret 12. Further, the processing unit 24 is configured by the punch and die at the processing position, the hydraulic cylinder, and the like.

A control device 30 is provided in the throat section 4 as shown in FIG. The control device 30 includes a CNC 31, MMC 32 and PMC as controllers.
33 is provided. Data is exchanged at high speed between the controllers via a window. The CNC 31 controls the servomotors 16 and 20 for moving the plate material 11 in the X-axis direction and the Y-axis direction, and includes a CPU, a ROM, a RAM, and the like. The MMC 32 is capable of performing various types of processing using a high-level language, and includes a CPU, ROM, RAM and the like. The MMC 32 prefetches the contents of the next line during machining of the machining program, and from the prefetched contents,
It is determined whether or not the work holders 13 and 14 and the processing section 24 interfere with each other. This determination is performed, for example, by determining whether or not the locus connecting the machining position in the content of the prefetched step and the machining position in the previous step is near the coordinates of the positions of the tips of the work holders 13 and 14. PMC33 is
It controls hydraulic pressure and turret drive, and includes a CPU, a ROM, a RAM, and the like.

DSC for MMC32 and PMC33
A (digital servo controller) 36 is connected. The DSC 36 is a controller for servo-controlling the position and speed of the hydraulic cylinder 40.
2 and a speed command to the speed control unit 38 according to the position information and the speed information given from the PMC 33. The speed control unit 38 is for feedback-controlling the processing speed of the processing unit 24 (the ascending / descending speed of the cylinder 40) according to the speed command given from the DSC 36, and is composed of a speed amplifier, an integrating circuit, and the like. . In addition, PMC3 3
A pressure control unit 50 is connected to. Pressure control unit 50
Is for controlling the pressure of the hydraulic cylinder 40.

A hydraulic cylinder 40 is vertically arranged above the processing position. An engaging portion 42 with which the head of a punch 41 forming the processing portion 24 can engage is attached to the tip of the piston rod of the hydraulic cylinder 40. An electrohydraulic 4-port 3-position servo valve 44 is connected to the hydraulic cylinder 40. The spool of the servo valve 44 is provided with a servo control coil 45 and a feedback detector 46. In the servo control coil 45,
A control signal from the speed control unit 38 is input. The detection signal of the feedback detector 46 is input to the speed control unit 38, and the movement amount of the spool is feedback-controlled by the speed control unit 38. This allows
The flow rate passing through the servo valve 44 is controlled, and the ascending / descending speed of the hydraulic cylinder 40 is controlled. Also,
The hydraulic cylinder 40 is provided with a position detector 47 that detects the position of the piston. The output of the position detector 47 is input to the DSC 36 via the A / D converter 48.

On the other hand, a pressure command is given from the PMC 33 to the pressure control unit 50. The pressure control unit 50 converts this into an electric signal and supplies it to the proportional electromagnetic relief valve 51. Further, the relief valve 51 is connected to a hydraulic circuit 54 including a pump 52 and a motor 53 that drives the pump 52. A hydraulic device 55 for controlling other actuators is connected to the hydraulic circuit 54. The hydraulic line of the hydraulic circuit 54 is connected to the servo valve 44.

As shown in FIG. 4, the MMC 32 is connected with a keyboard 34, a CRT 35, a host interface 37 for connection with a host computer, and other input / output units. An axis control unit 39 for controlling the X axis and the Y axis is connected to the CNC 31. Further, the PMC 33 has an upper turret 12 and a lower turret 2.
A turret drive unit 19 for driving the motor 2 and other input / output units are connected.

Next, the control operation of the control device 30 will be described based on the control flow chart shown in FIG. First, in step S1, initial settings such as movement to the origin of the table are performed. In step S2, for example, the machining program is read from the host computer via the host interface 37 and stored in the RAM in the CNC 31.
In step S3, the operator waits for a work start command.
When the work start command is input, the process proceeds to step S4.
In step S4, one step of the machining program is read. Then, in step S5, the next step of the machining program is read. The process in step S4 is performed by the CNC 31, and the process in step S5 is performed by the MMC32. In step S6, it is determined whether or not the content of the step read in step S4 means a machining command. In step S7, it is determined from the contents of the next step read in step S5 whether or not the work holders 13 and 14 and the processing section 24 interfere with each other in the next step. This determination is made by the MMC32 as described above,
It is determined whether or not the locus connecting the processing position of this step and the processing position of the next step is near the tip positions of the work holders 13 and 14.

In step S8, it is determined whether or not the contents read in step S4 mean another command. In step S9, it is determined whether or not the content of the read step means the end. If the determination in step S9 is yes, the process ends. If NO, the process returns to step S4. On the other hand, step S
When it is determined in step 6 that the instruction means machining, step S
Go to 10.

In step S10, a machining routine is executed. In this processing routine, as shown in FIG. 6, in step S21, it is determined whether or not the interference flag is set in step S11 described later. If it is determined that the interference flag is set (there is a risk of interference), the process proceeds to step S22. After step S22, first, the plate member 11 is moved to a predetermined position, and after the positioning is completed, the hydraulic head is driven.

That is, first, in step S22, the interference flag is reset. In step S23, the movement of the cross slide 15 and the carriage 7 is started, and the movement of the plate material 11 is started. In step S24, it waits until the processing position of the plate material 11 reaches a predetermined position. When the processing position of the plate material 11 reaches the predetermined position, the process proceeds to step S25. In step S25, the movement of the plate material 11 is stopped. In step S26, the hydraulic cylinder 40 starts to descend.
In step S27, the process waits until the hydraulic cylinder 40 reaches the lower end. When the hydraulic cylinder 40 reaches the lower end, the process proceeds to step S28. In step S28, the descent is stopped. In step S29, raising of the hydraulic cylinder 40 is started. In step S30, the hydraulic cylinder 40 waits until it reaches the rising end. When the hydraulic cylinder 40 reaches the rising end, the process proceeds to step S31. Step S3
At 1, the hydraulic cylinder 40 stops rising. When the hydraulic cylinder 40 stops rising, the process returns to the main routine.

On the other hand, if it is determined in step S21 that the interference flag is not set (no risk of interference), the process proceeds to step S32. After step S32, the drive of the hydraulic head is started before the positioning of the plate material 11 is completed. That is, in step S32, the hydraulic cylinder 40 is started to move down and the plate material 11 is started to move. In step S33, it is determined whether the plate material 11 has reached a predetermined processing position, that is, whether positioning has been completed. When the positioning of the plate material 11 is not completed, the process proceeds to step S34. In step S34, it is determined whether the hydraulic cylinder 40 has reached a predetermined standby position. This standby position is set so that the tip of the punch tool is above the uppermost surface of the work holders 13 and 14 so that the punch tool that is descending during the movement of the plate material does not contact the work holders 13 and 14 or the plate material 11. It has become. When it is determined that the hydraulic cylinder 40 has not reached the standby position, the process returns to step S33. When it is determined that the hydraulic cylinder 40 has reached the standby position, the process proceeds to step S35. In step S35, the hydraulic cylinder 4
Stop the descent of 0. In step S36, the completion of positioning of the plate material is awaited. When the positioning of the plate material 11 is completed, the process proceeds to step S37. In step S37, the hydraulic cylinder 40 is lowered again.

When it is determined in step S33 that the positioning of the plate material 11 is completed, or when the processing in step S37 is completed, the process proceeds to step S27 and waits for the hydraulic cylinder 40 to reach the lower end. After that, the processes of steps S28 to S31 are executed as described above. On the other hand, if it is determined in step S7 that the work holders 13 and 14 interfere with the machining portion 24 based on the contents of the pre-read next step, the process proceeds to step S11, the interference flag is set, and the process proceeds to step S8. This interference flag indicates that interference will occur in the processing of the next step.

When it is determined in step S8 that the command is another command, the process proceeds to step S12, another process corresponding to the command is executed, and the process proceeds to step S9. As described above, in the present embodiment, the presence or absence of interference is preliminarily determined and determined. If there is interference during processing, if there is interference, the hydraulic cylinder is lowered after the plate reaches a predetermined processing position, and the plate 11
Start the processing of. Further, when there is no interference, the machining of the hydraulic cylinder 40 and the movement of the plate 11 are simultaneously performed, and when the hydraulic cylinder 40 is lowered from the predetermined position before the movement of the plate 11 is finished, the hydraulic pressure is The cylinder 40 is made to stand by at a predetermined position.

As a result, the machining time can be shortened and the interference between the machining section 24 and the work holder can be prevented. In Other Embodiments previous SL embodiment has been described as an example turret punch press as hydraulic press, to other hydraulic press, such as a shearing machine or a vendor applicability of the present invention.

[0025]

The hydraulic press according to the present invention does not interfere with each other.
The hydraulic head is lowered while the work holder is moving.
The processing time can be shortened. Also, in case of interference,
Positioning the descending motion of the hydraulic head from the ascending end to the descending end
Since it starts after completion, interference can be reliably prevented.
In addition, the hydraulic head should be installed regardless of the possibility of interference.
You only have to move between the rising and falling edges, so
No need for coarse stroke control. In addition, the pre-reading means
When judging the possibility of interference based on the look-ahead result
Can reliably determine the possibility of interference during operation. Further
The hydraulic head when it is determined that there is no possibility of interference.
Plate material positioning during parallel operation with plate material positioning
Until the end of the hydraulic head
If you do not move it toward the
Even if it takes more time than descending, as much processing time as possible
It is possible to realize reliable plate material processing while shortening.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a hydraulic punch press machine that is a hydraulic press according to an embodiment of the present invention.

FIG. 2 is a schematic plan view thereof.

FIG. 3 is a schematic block diagram of a control device of a hydraulic punch press machine.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a flowchart showing a control operation.

FIG. 6 is a flowchart showing the contents of processing processing.

[Explanation of symbols]

 1 Punch Press Machine 13, 14 Work Holder 24 Machining Section 30 Control Device 32 MMC 33 PMC 40 Hydraulic Cylinder 41 Punch 43 Die

Claims (3)

(57) [Claims] 1. A work holder for gripping and positioning a plate member and a reciprocating drive between a rising end and a falling end of the work.
In a hydraulic press including a hydraulic head that processes a plate material held by a holder, an interference determination unit that determines a possibility of interference with the hydraulic head when the work holder is positioned and moved, and an interference determination unit that determines whether interference occurs . Determined not to be possible
Of the hydraulic head from the ascending end to the descending end.
The descending operation and the plate material positioning operation of the work holder are performed in parallel.
The interference determination means may cause interference.
When it is determined that the plate material position by the work holder
Wait until the completion of the operation before starting the descending operation.
A hydraulic press, comprising: a control means for controlling the hydraulic head and the work holder . 2. During machining of a machining program consisting of a plurality of lines
2. The hydraulic press according to claim 1 , further comprising pre-reading means for pre-reading the next row of the pre-reading, and the interference determining means determines the possibility of the interference based on the pre-reading result of the pre-reading means. 3. A predetermined waiting between the ascending end and the descending end
The tip of the hydraulic head on the way down has reached the position
A head position determining means for determining whether or not
The control means has no possibility of interference due to the interference determination means.
If the hydraulic head and plate material positioning are
During the movement process, the
Move the pressure head tip downward from the predetermined standby position.
Claims 1 or hydraulic press according to claim 2, wherein.