JP6179807B2 - Die cushion control device and method - Google Patents

Description

  The present invention relates to a die cushion control device and method for a press machine.

The press machine (or press) is a plastic working machine that sandwiches a workpiece between an upper die and a lower die and plastically deforms the workpiece by applying a pressing force therebetween. This processing is called press processing.
The press machine is roughly classified into a mechanical press, a hydraulic press, and a servo press. The mechanical press is classified into a crank type and a link type depending on a difference in a mechanism for generating a pressing force.

The die cushion device is a device that generates a wrinkle pressing force (cushion force) of a workpiece by sandwiching the workpiece between an upper die and a blank holder in a press machine.
Means for controlling the die cushion device is disclosed in, for example, Patent Documents 1 to 3.

  The "die cushion mechanism and its control device and control method" in Patent Document 1 is a control device for a die cushion mechanism that generates an external force using a servo motor as a drive source. Further, Patent Document 1 includes an abnormality prevention unit that prevents the die cushion mechanism from generating an abnormal force in relation to the control state of the servo motor.

  The “die cushion device of a press machine” in Patent Document 2 includes a linear drive device that drives a braking member by a combination of a servo motor and a ball screw, and a hydraulic transmission that reduces the speed of the braking member and transmits the braking member to a cushion pad. It is to be prepared.

  Patent Document 3 “Press Machine Condition Setting Device” calculates air pressure from mold information and machine information, and supplies and exhausts air pressure in the air tank as the press process condition. The valve is switched and controlled.

Japanese Patent No. 4610635 JP 2011-83782 A JP-A-5-285700

Due to the diversification of molding materials, etc., it is becoming possible to set a finer cushion force, but conversely, the setting method becomes complicated, and there is a possibility that the system will be operated with a capacity exceeding the permissible capacity of the system.
The cushion force and molding stroke can be easily prevented from being outside the specification range by setting the input range, but the work amount of the cushion is not a setting item, so it is not checked or there is a margin in the upper limit value of the cushion force It was supported by taking.

  The die cushion device needs to set in advance a cushion force and a cushion stroke (hereinafter simply referred to as “stroke”) on which the cushion force acts. With the recent diversification of molding materials, the cushion force and stroke are not set to a constant value but are set in a plurality of steps.

  However, since the cushion force and stroke can be set freely within the capacity range of the die cushion device, even when the cushion force and stroke setting range is limited, the energy consumed by the die cushion device may become excessive. . For this reason, during the operation of the press machine, the press speed may decrease or may stop during the press work.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to prevent die press speed of a press machine and stop during press processing, and to set a cushion force and a stroke freely within a range that satisfies the constraints of the press machine. It is to provide an apparatus and method.

According to the present invention, it is possible to input a setting relationship between the setting stroke of the die cushion device and the setting cushion force, and a setting display device that displays control information;
An arithmetic and control unit that calculates and outputs the control information from the setting relationship,
The arithmetic and control unit is
A storage unit for storing the constraints of the press machine;
A setting calculation unit for calculating a setting work amount from the setting relationship;
A setting determination unit that determines whether or not the set work amount satisfies the constraint condition;
A setting output unit that outputs the setting work amount and a setting determination result by the setting determination unit as the control information;
The setting display device displays the setting relationship, the setting work amount, and the setting determination result, and a die cushion control device is provided.

The arithmetic and control unit is
An actual measurement detection unit for detecting an actual relationship between the actual stroke and the actual cushion force during operation of the press machine;
An actual measurement calculation unit for calculating an actual measurement work amount from the actual measurement relationship;
An actual measurement determination unit that determines whether or not the actual measurement work satisfies the constraint condition;
An actual measurement output unit that outputs the actual measurement work amount and the actual measurement determination result by the actual measurement determination unit as the control information;
The setting display device displays the actual measurement relationship, the actual measurement work amount, and the actual measurement determination result.

  The restricting condition of the press machine is a work amount obtained by adding a part or all of the work amount of the rated motor of the main motor of the press machine or the work of the device for storing energy to the rated work amount.

Further, according to the present invention, the setting display device that can input the setting relationship between the setting stroke of the die cushion device and the setting cushion force, and displays control information;
An arithmetic control device that calculates and outputs the control information from the setting relationship is prepared,
By the arithmetic and control unit,
Memorize the constraints of the press machine,
Calculate the setting work from the setting relationship,
It is determined whether the set work amount satisfies the constraint condition,
Output the setting work result and the setting determination result by the determination as the control information,
A die cushion control method is provided, wherein the setting display device displays the setting relationship, the setting work amount, and the setting determination result.

By the arithmetic and control unit,
Detect the actual relationship between actual stroke and actual cushion force during the operation of the press machine,
Calculate the measured work from the measured relationship,
Determining whether the measured workload satisfies the constraints,
The actual measurement work result and the actual measurement determination result by the determination are output as the control information,
The setting display device displays the actual measurement relationship, the actual measurement workload, and the actual measurement determination result.

According to the apparatus and method of the present invention, the setting calculation unit calculates the setting work amount from the setting relationship between the setting stroke and the setting cushion force, and the setting determination unit determines whether or not the setting work amount satisfies the constraints of the press machine. Determine. Therefore, by displaying the setting relationship, the setting work amount, and the setting determination result on the setting display device, it is possible to recognize a decrease in the pressing speed or a stop during the pressing before the press machine is operated.
Thereby, a reduction in press speed and a stop during press working can be prevented, and the cushioning force and stroke can be freely set within a range that satisfies the constraints of the press machine before the press machine is operated.

It is a whole lineblock diagram of a press machine provided with a die cushion device. It is a figure which shows the relationship between a die cushion apparatus and the die cushion control apparatus by this invention. It is a schematic diagram of the die cushion control apparatus by this invention. It is a whole flow figure of the die cushion control method by the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 1 is an overall configuration diagram of a press machine P including a die cushion device 10.
In this figure, the press machine P lowers the upper mold 4 fixed to the lower surface of the slide 3 that moves up and down with respect to the lower mold 2 fixed to the upper surface of the bolster 1. Thereby, the press machine P pressurizes a workpiece (workpiece: also called a blank) (not shown) between the lower mold 2 and the upper mold 4 and press-forms the workpiece into a predetermined shape.
In this case, the lower mold 2 is supported by the bolster 1, the bolster 1 is supported by the bed 8, and the bed 8 receives a press molding load.

Further, when the workpiece is press-molded by the upper die 4 and the lower die 2, the blank holder 5 that holds the workpiece is supported by the cushion pad 7 via the cushion pin 6.
The blank holder 5 holds the workpiece with the upper mold 4 during press molding of the workpiece, and supports the peripheral portion of the lower surface of the workpiece to hold the workpiece.
The cushion pin 6 is a bar-shaped component that penetrates the bolster 1 and extends up and down and is movable up and down.
The cushion pad 7 supports the cushion pin 6 on the upper surface. The cushion pad 7 is positioned below the blank holder 5 and moves up and down in synchronization with the blank holder 5.
With the above-described configuration, the blank holder 5, the cushion pin 6, and the cushion pad 7 move up and down integrally as a whole.

  The die cushion device 10 sandwiches a workpiece (workpiece) between the upper die 4 of the press machine P and the blank holder 5, and applies an upward cushioning force f to the blank holder 5 via cushion pins 6 and cushion pads 7. It is a device that moves them up and down while adding.

  In FIG. 1, the die cushion device 10 includes a hydraulic cushion 12 and a pneumatic cushion 20.

  The hydraulic cushion 12 includes a linear drive device 14 and a hydraulic transmission 16.

  The linear drive device 14 is configured to be able to drive the braking member 15 along a predetermined straight line by a combination of the servo motor 14a and the ball screw 14b, and to regenerate energy from the linear motion of the braking member 15.

The hydraulic transmission 16 accelerates the vertical movement of the cushion pad 7 to the linear motion of the braking member 15 of the linear drive device 14 via the enclosed hydraulic pressure, and the linear motion of the braking member 15 via the hydraulic pressure. Thus, the cushion pad 7 is decelerated by the vertical movement.
The hydraulic transmission 16 includes a large diameter piston 17, a small diameter piston 18, and a Pascal cylinder 19.
The large-diameter piston 17 is positioned below the cushion pad 7 and is configured to move up and down together with the blank holder 5.
The small-diameter piston 18 is connected to the braking member 15 of the linear drive device 14 and moves linearly therewith.
The Pascal cylinder 19 guides the large-diameter piston 17 and the small-diameter piston 18 so as to be independently movable in the axial direction, and incompressible hydraulic fluid is enclosed therebetween.

  The pneumatic cushion 20 includes a pneumatic cylinder 21, a pneumatic tank 22, a solenoid valve 23, and an opening / closing valve 24, and supplies air of a predetermined pressure from the pneumatic source 25 to the pneumatic cylinder 21 and exhausts it. Yes.

The die cushion device 10 further includes a stroke detection device 26 that detects the stroke s during operation of the die cushion device 10 and a cushion force detection device 28 that detects the cushion force f.
In this example, the stroke detection device 26 is a linear encoder attached to the cushion pad 7 and outputs the amount of vertical movement of the cushion pad 7 in real time. The stroke detection device 26 is not limited to this example, and may be a sensor having another configuration.
In this example, the cushion force detection device 28 detects a pressure in the Pascal cylinder 19 (pressure between the large-diameter piston 17 and the small-diameter piston 18) and a pressure in the pneumatic cylinder 21. This is the air pressure sensor 28b. The cushion force detection device 28 is not limited to this example, and may be a sensor having another configuration.

  Moreover, this invention is not limited to the die cushion apparatus 10 mentioned above, Other well-known die cushion apparatuses may be sufficient. Hereinafter, the present invention will be described using the die cushion device 10 described above.

FIG. 2 is a diagram showing the relationship between the die cushion device 10 and the die cushion control device 30 according to the present invention.
In this figure, 29 is a cushion controller for controlling the stroke s and the cushioning force f of the die cushion device 10.

FIG. 3 is a schematic diagram of a die cushion control device 30 according to the present invention.
In this figure, a die cushion control device 30 of the present invention includes a setting display device 32 and a calculation control device 34.

The setting display device 32 can input the setting relationship A1 between the setting stroke s1 and the setting cushion force f1 of the die cushion device 10 and displays the control information B. The “set stroke s1” means the set stroke s, and the “set cushion force f1” means the set cushion force f.
The input of the setting relationship A1 is preferably performed manually by an operator (person), but may be input from other means such as an external computer.

The setting display device 32 is a touch panel display in this example. In this example, the setting relationship A1 is a setting stroke s1 and a setting cushion force f1 corresponding to steps 1 to 8, respectively, and is input in a table or a graph. The setting relationship A1 may be a curve representing the relationship between the setting cushion force f1 and the setting stroke s1.
Further, the setting display device 32 displays the setting relationship A1 between the setting stroke s1 and the setting cushion force f1 as a part of the control information B in a table or a graph. Details of the control information B will be described later.

  The arithmetic control device 34 is, for example, a computer (PC), and calculates and outputs the control information B from the input setting relationship A1.

  In FIG. 3, the calculation control device 34 includes a storage unit 35a, a setting calculation unit 35b, a setting determination unit 35c, and a setting output unit 35d.

The storage unit 35a stores the constraint condition C of the press machine P.
Here, as the constraint condition C of the press machine P, the rated work amount of the main motor of the press machine P is preferably set as the maximum work amount CM.
Further, when the press machine P has a device for storing energy, for example, a flywheel, a part or all of the work of the device for storing energy (that is, the flywheel) is set to the rated work of the main motor. The added work amount may be set as the maximum work amount CM.
Further, when the work required for press working of a work (work work work) is known or can be predicted, the work obtained by subtracting the work work from the work described above may be set as the maximum work CM. .

  The setting calculation unit 35b calculates the set work amount W1 from the input setting relationship A1. The set work amount W1 is obtained by integrating the set stroke s1 and the set cushion force f1 in the setting relationship A1. When the setting relationship A1 is a curve representing the relationship between the set cushion force f1 and the set stroke s1, it is preferable to obtain the set work amount W1 by integrating an expression representing the curve.

The setting determination unit 35c determines whether or not the set work amount W1 obtained by the calculation satisfies the constraint condition C of the press machine P. That is, when the set work amount W1 is compared with the maximum work amount CM and the set work amount W1 is smaller than the maximum work amount CM, it is determined that “the constraint condition C is satisfied”, and the set work amount W1 is determined to be the maximum work amount CM. Is equal to or greater than this, it is determined that “the constraint C is not satisfied”.
The setting output unit 35d outputs the setting work amount W1 obtained by the calculation and the setting determination result by the setting determination unit 35c as the control information B.

The setting display device 32 displays the input setting relation A1, the set work amount W1 obtained by calculation, and the setting determination result by the setting determination unit 35c.
The setting determination result may be an alarm display that calls attention by sound or color when “the constraint condition C is not satisfied”.

  In FIG. 3, the arithmetic and control unit 34 further includes an actual measurement detection unit 36a, an actual measurement calculation unit 36b, an actual measurement determination unit 36c, and an actual measurement output unit 36d.

The actual measurement detector 36a receives the detection data of the stroke detection device 26 and the cushion force detection device 28 described above, and detects the relationship (measurement relationship A2) in real time from the actual values of the actual stroke s2 and the actual cushion force f2.
The “actual stroke s2” means the actually measured stroke s, and the “actual cushion force f2” means the actually measured cushion force f.

  The actual measurement calculation unit 36b calculates an actual measurement work amount W2 from the detected actual measurement relationship A2. The actually measured work amount W2 is obtained by integrating the actual stroke s2 in the actual measurement relationship A2. When the actual measurement relationship A2 is a curve represented by f2 = g2 (s2), it is preferable to obtain the actual measurement work amount W2 by integrating the curve.

The actual measurement determination unit 36c determines whether the actual measurement work amount W2 obtained by the calculation satisfies the constraint condition C of the press machine P described above. That is, the measured work amount W2 is compared with the maximum work amount CM, and when the measured work amount W2 is smaller than the maximum work amount CM, it is determined that “constraint condition C is satisfied”, and the actually measured work amount W2 is the maximum work amount CM. Is equal to or greater than this, it is determined that “the constraint C is not satisfied”.
The actual measurement output unit 36d outputs the actual measurement work amount W2 obtained by calculation and the actual measurement determination result by the actual measurement determination unit 36c as control information B.

The setting display device 32 displays the actual measurement relationship A2 between the actual stroke s2 and the actual cushion force f2, the actual measurement work amount W2 obtained by calculation, and the actual measurement determination result by the actual measurement determination unit 36c.
The actual measurement determination result may be an alarm display that calls attention by sound or color when “the constraint C is not satisfied”. Further, when there is a possibility that the press speed is reduced or the press is stopped, the press machine P may be stopped at a predetermined cycle position (for example, a return position) together with an alarm display.

  FIG. 4 is an overall flowchart of the die cushion control method according to the present invention. As shown in this figure, the die cushion control method of the present invention comprises the steps (steps) S1 to S11.

  In the die cushion control method of the present invention, the setting display device 32 and the arithmetic control device 34 described above are prepared.

Steps S <b> 1 to S <b> 6 indicate operations before the press machine P is activated.
In step S <b> 1, the arithmetic control device 34 stores the constraint condition C of the press machine P.
In step S2, the setting display device 32 inputs a setting relationship A1 between the setting stroke s1 of the die cushion device 10 and the setting cushion force f1.
In step S3, the set work amount W1 is calculated from the set relationship A1.
In step S4, it is determined whether or not the set work amount W1 satisfies the constraint condition C.
In step S5, the set work amount W1 and the setting determination result by the setting determining unit 35c are output as control information B.
In step S6, the setting display device 32 displays the setting relationship A1, the set work amount W1, and the setting determination result.

Steps S <b> 7 to S <b> 11 indicate operations during operation of the press machine P.
In step S7, an actual measurement relationship A2 between the actual stroke s2 and the actual cushion force f2 during operation of the die cushion device 10 is detected.
In step S8, the actual measurement work amount W2 is calculated from the actual measurement relationship A2.
In step S9, it is determined whether or not the actually measured work amount W2 satisfies the constraint condition C.
In step S10, the actual measurement work amount W2 and the actual measurement determination result by the actual measurement determination unit 36c are output as control information B.
In step S11, the setting display device 32 displays the actual measurement relationship A2, the actual measurement work amount W2, and the actual measurement determination result.

According to the apparatus and method of the present invention described above, the setting work unit Wb calculates the setting work amount W1 from the setting relationship A1 between the setting stroke s1 and the setting cushion force f1, and the setting determination unit 35c calculates the setting work amount W1. It is determined whether or not P constraint condition C is satisfied. Therefore, the setting display device 32 displays the setting relationship A1, the setting work amount W1, and the setting determination result, so that a decrease in the pressing speed and a stop during the pressing can be recognized before the press machine P is operated.
This prevents a reduction in press speed and a stop during press working, and the set cushion force f1 and the set stroke s1 are set freely within a range that satisfies the constraint condition C of the press machine P before the press machine P is operated. can do.

  Further, during the operation of the press machine P, the actual measurement work unit W calculates the actual measurement work amount W2 from the actual measurement relationship A2 between the actual stroke s2 and the actual cushion force f2, and the actual measurement determination unit 36c sets the constraint condition C to the constraint condition C. It is determined whether or not it is satisfied. Accordingly, by displaying the actual measurement relationship A2, the actual measurement work amount W2, and the actual measurement determination result by the setting display device 32 during the operation of the press machine P, it is possible to prevent the press speed from being lowered or stopped during the press work. Can do.

  In addition, this invention is not limited to embodiment mentioned above, is shown by description of a claim, and also includes all the changes within the meaning and range equivalent to description of a claim.

A1 setting relationship, A2 actual measurement relationship, B control information, C constraint condition,
CM Maximum work load, f cushion force, f1 set cushion force,
f2 Actual cushion force, P press machine, s stroke,
s1 set stroke, s2 actual stroke, W1 set work load,
W2 Actual work, 1 Bolster, 2 Lower mold, 3 Slide,
4 Upper mold, 5 Blank holder, 6 Cushion pin,
7 cushion pads, 8 beds, 10 die cushion devices,
12 Hydraulic cushion, 14 Linear drive, 14a Servo motor,
14b ball screw, 15 braking member, 16 hydraulic transmission,
17 Large diameter piston, 18 Small diameter piston, 19 Pascal cylinder,
20 pneumatic cushions, 21 pneumatic cylinders, 22 pneumatic tanks,
23 Solenoid valve, 24 On-off valve, 25 Air pressure source 26 Stroke detection device,
28 Cushion force detection device, 28a Hydraulic pressure sensor, 28b Air pressure sensor,
29 Cushion controller, 30 Die cushion control device,
32 setting display device, 34 arithmetic control device, 35a storage unit,
35b setting calculation unit, 35c setting determination unit, 35d setting output unit,
36a actual measurement detection unit, 36b actual measurement calculation unit, 36c actual measurement determination unit,
36d Actual output section

Claims (5)

A setting display device capable of inputting a setting relationship between a setting stroke and a setting cushion force of the die cushion device, and displaying control information;
An arithmetic and control unit that calculates and outputs the control information from the setting relationship,
The arithmetic and control unit is
A storage unit for storing the constraints of the press machine;
A setting calculation unit for calculating a setting work amount from the setting relationship;
A setting determination unit that determines whether or not the set work amount satisfies the constraint condition;
A setting output unit that outputs the setting work amount and a setting determination result by the setting determination unit as the control information;
The die cushion control device, wherein the setting display device displays the setting relationship, a setting work amount, and a setting determination result. The arithmetic and control unit is
An actual measurement detection unit for detecting an actual relationship between the actual stroke and the actual cushion force during operation of the press machine;
An actual measurement calculation unit for calculating an actual measurement work amount from the actual measurement relationship;
An actual measurement determination unit that determines whether or not the actual measurement work satisfies the constraint condition;
An actual measurement output unit that outputs the actual measurement work amount and the actual measurement determination result by the actual measurement determination unit as the control information;
The die cushion control device according to claim 1, wherein the setting display device displays the actual measurement relationship, the actual measurement work amount, and the actual measurement determination result.   The restriction condition of the press machine is a work amount obtained by adding a part or all of a rated work amount of a main motor of the press machine or a work amount of a device for storing energy to the rated work amount. Item 2. The die cushion control device according to Item 1. A setting display device capable of inputting a setting relationship between a setting stroke and a setting cushion force of the die cushion device, and displaying control information;
An arithmetic control device that calculates and outputs the control information from the setting relationship is prepared,
By the arithmetic and control unit,
Memorize the constraints of the press machine,
Calculate the setting work from the setting relationship,
It is determined whether the set work amount satisfies the constraint condition,
Output the setting work result and the setting determination result by the determination as the control information,
The die cushion control method, wherein the setting display device displays the setting relationship, the setting work amount, and the setting determination result. By the arithmetic and control unit,
Detect the actual relationship between actual stroke and actual cushion force during the operation of the press machine,
Calculate the measured work from the measured relationship,
Determining whether the measured workload satisfies the constraints,
The actual measurement work result and the actual measurement determination result by the determination are output as the control information,
The die cushion control method according to claim 4, wherein the actual measurement relationship, the actual measurement work amount, and the actual measurement determination result are displayed by the setting display device.

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