JPH07106400B2 - 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 having a hydraulic head for processing a plate material held by a work holder.

[0002]

2. Description of the Related Art In recent years, as a punch press machine for punching or 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, the hit rate of the die is extremely high, such as several hundreds per minute, so that the punch press machine is conventionally limited to a crank type machine using a motor as a drive source. However, due to improvements in hydraulic devices, high-speed operation has become possible, and hydraulic punch press machines have come to be 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 tool is raised to the top dead center of the hydraulic cylinder only when the tool is replaced, and otherwise the tool is allowed to stand by at the lowest allowable level to minimize the stroke.

[0004]

In the hydraulic punch press machine, when 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. For this reason, when the plate material is subjected to drawing processing, molding processing, or the like and the processed portion is projected upward, interference between the protruding processed portion and the tool forming the hydraulic head becomes a problem. That is, when the gap is small and the lower surface of the tool is located below the upper surface of the protruding portion, the protruding processed portion may come into contact with the tool.

An object of the present invention is to prevent interference between a protruding processed portion and a hydraulic head.

[0006]

A hydraulic press according to the present invention comprises a hydraulic head for processing a plate material held by a work holder, a projection processing information detecting means, and a control means. The protrusion processing information detecting means detects information regarding the protrusion processing of the plate material in the processing. The control means controls the standby position of the hydraulic head in processing based on the detection result of the protrusion processing information detection means.

[0007]

In the hydraulic press according to the present invention, when the hydraulic head processes the plate material gripped by the work holder, the protrusion processing information detecting means detects the information regarding the protrusion processing of the plate material in the processing. When the protrusion processing information detection means detects information regarding the protrusion processing, the control means controls the standby position of the hydraulic head in the processing based on the detection result. For example, when the protrusion processing part passes under the hydraulic head, the standby position of the hydraulic head is controlled to be higher than usual, and whether or not there is protrusion processing in the machining program is detected. If there is, the standby position of the hydraulic head in the machining is controlled to be higher than usual.

As a result, it is possible to prevent interference between the protruding portion and the hydraulic head.

[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 supporting the upper frame 3 at the rear side. 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 rails 5, 6
The carriage 7 is arranged on the top 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 holding the plate material 11 is 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 10. 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
It 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 that is moved up and down by a hydraulic cylinder (described later) 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 hydraulic head 24 is composed of a punch, a die, a hydraulic cylinder and the like arranged at the processing position.

In the throat section 4, as shown in FIG.
A control device 30 is provided. This control device 30
CNC31, MMC32 and PM as controller
Equipped with C33. 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 also includes a CPU, ROM, RAM and the like. The MMC 32 pre-reads the contents of all lines of the machining program, and determines from the pre-read contents whether or not the protrusion process such as drawing process or molding process is performed. This determination is made, for example, based on whether or not a tool used for protrusion processing is designated by the station number in the contents of each preread line. Note that the RAM in the MMC 32 stores tool information such as a flag indicating the relationship between the station number of the turret 12 and the tools housed therein and whether the housed tools carry out protrusion machining. . PMC
The numeral 33 controls the hydraulic pressure and the 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 hydraulic head 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. . Also PMC
A pressure control unit 50 is connected to 33. The 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. At the tip of the piston rod of the hydraulic cylinder 40, an engaging portion 42 with which the head of the punch 41 forming the hydraulic head 24 can engage is attached. An electrohydraulic 3-position 4-port servo valve 44 is connected to the hydraulic cylinder 40. A servo control coil 45 and a feedback detector 46 are provided on the spool of the servo valve 44. A control signal from the speed control unit 38 is input to the servo control coil 45,
The detection signal of the feedback detector 46 is the speed control unit 38.
Has been entered in. The flow rate passing through the servo valve 44 is controlled by the speed control unit 38, and the lifting speed of the hydraulic cylinder 40 is controlled.

Further, the hydraulic cylinder 40 is provided with a position detector 47 for detecting the position of the piston. The output of the position detector 47 is sent to the DSC via the A / D converter 48.
It is input to 36. On the other hand, the pressure control unit 50 has P
A pressure command is given from the MC 33. The pressure control unit 50 converts this into an electric signal and supplies it to the proportional electromagnetic relief valve 51. 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. 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. In step S3, the read machining program is pre-read by the MMC 32. Step S
In 4, the station number and MM included in the look-ahead result
Based on the tool information stored in the RAM in C32, it is determined in the machining program whether or not the protrusion machining is performed. When it is determined that the protrusion processing is performed, the process proceeds to step S5. In step S5, the standby position is set to L1. The standby position L1 is a standby position such that the protrusion processing portion and the lower surface of the tool of the hydraulic head 24 do not interfere with each other. If it is determined that there is no protrusion processing, the process proceeds from step S4 to step S6. In step S6, the standby position is set to L2. The standby position L2 is a standby position for performing processing with a minimum stroke.

When the operation in step S5 or step S6 is completed, the process proceeds to step S7. In step S7, the operator waits for a work start command. When the work start command is input, the process proceeds to step S8. In step S8, the hydraulic cylinder 40 is lowered to the standby position set in step S5 or step S6, and is temporarily made to stand there.

In step S9, one step of the machining program is read. In steps S10 to S12, the content of the read step is determined. That is, in step S10, it is determined whether the content of the read step means a machining command. In step S11, it is determined whether or not it means another command. In step S12, it is determined whether or not the end command is meant. If YES is determined in step S12, the process ends. If NO is determined, the process returns to step S9 to read the next step.

On the other hand, if it is determined that the step means processing, the process proceeds from step S10 to step S13. In step S13, the plate material 11 is gripped by the work holders 13 and 14 and moved to a desired processing position. In step S14, the hydraulic cylinder 40 is lowered from the standby position to the lower end, and the plate material 11 is subjected to predetermined processing. In step S15, the hydraulic cylinder 40 is raised from the lower end to the standby position. With these operations, one step of processing is completed. If it is determined that it means another command, the process proceeds from step S11 to step S16. In step S16, processing according to the command is performed.

As described above, in this embodiment, the machining program is pre-read, the presence or absence of the protrusion machining is determined according to the pre-reading result, the standby position is changed according to the presence or absence of the protrusion machining, and the stroke is changed. Therefore, it is possible to prevent interference between the protruding portion and the hydraulic head 24. [Other Embodiments] (a) In the above-described embodiment, the machining program is pre-read to determine the presence or absence of protrusion machining, and accordingly the hydraulic cylinder 40
Although the standby position is changed, as shown in FIG. 6, the standby position may be changed according to the detection of the interference between the protruding processing portion and the hydraulic head 24 during the processing.

That is, in step S21, initial setting is performed, and in step S22, a machining program is read. In step S23, a work start command is waited for. Subsequently, in step S24, the hydraulic cylinder 40 is lowered to the standby position L2. This standby position is the same position as in the above-described embodiment, and is a position for performing processing with a minimum stroke. In step S25, the machining program 1
Read the step. In steps S26 to S28, the same judgment as in steps S10 to S12 is performed.

When it is determined in step S26 that the processing means processing, the process proceeds to step S29.
In step S29, it is determined whether or not there is interference between the protruding portion and the hydraulic head 24 by determining whether or not the tool used here is a tool that performs protrusion processing. That is, in the case of machining with a tool that performs protrusion processing, the presence or absence of interference with the processing portion 24 is determined by the height of the protruding portion. The presence / absence of this interference can be determined in advance by, for example, the relationship between the station numbers of the turrets 12 and 22 and the tools attached to the turrets.
This can be done by storing in a RAM in C32 and further storing therein a flag indicating the presence or absence of interference. When storing this flag, it is possible to determine the presence or absence of interference by searching the contents of the RAM by the station number and checking whether the flag is set there.

If it is determined that there is interference, the process proceeds from step S29 to S30. In step S30, the standby position is set to L1 and the hydraulic cylinder 40 is raised to that position. When it is determined in step S29 that there is no interference, or when the operation in step S30 ends, the process proceeds to step S31. In step S31, the work holders 13 and 14 move the plate material 11 to a desired processing position. In step S32, the hydraulic cylinder 40
Is moved up and down, and the plate material 11 is subjected to desired processing. The rest of the process flow is the same as the process shown in FIG. (B) In the above embodiments, the turret punch press machine was described as an example of the hydraulic press, but the present invention can be applied to other hydraulic presses such as a shearing machine and a bender.

[0025]

As described above, in the hydraulic press according to the present invention, the information regarding the projecting process on the plate material in the processing is detected, and the standby position of the hydraulic head is controlled based on the detection result. Also in the above, there is no interference between the hydraulic head and the protruding processed portion.

[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 view corresponding to FIG. 5 of another embodiment.

[Explanation of symbols]

 1 Punch Press Machine 13, 14 Work Holder 24 Hydraulic Head 30 Control Device 32 MMC 33 PMC 40 Hydraulic Cylinder 41 Punch 43 Die L1, L2 Standby Position

Claims (1)

[Claims] 1. A hydraulic head for processing a plate material gripped by a work holder, projection processing information detecting means for detecting information on a projection processing of a plate material in processing, and based on a detection result of the projection processing information detecting means. A hydraulic press comprising: control means for controlling a standby position of the hydraulic head in the processing.