JPH0632879B2 - How to operate a hydraulic press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for operating a hydraulic press machine.

(Prior Art) Conventionally, when operating a hydraulic press machine, the oil supplied to the cylinder chamber of the hydraulic cylinder is warmed by, for example, a heater or the like to detect that the oil has reached a constant temperature. That is, the hydraulic press machine is operated on the premise that the fluidity of the oil has become appropriate by detecting that the oil supplied to the cylinder chamber has reached a certain temperature, and the desired plate material is pressed. Has been done.

(Problems to be Solved by the Invention) By the way, for example, when the oil to be used is changed, it is necessary to manage the temperature according to the oil, and there is a problem that the temperature management is very troublesome.

In order to improve the above-mentioned problems, the present invention does not require oil temperature control and can easily perform warm-up on the basis of a preset reference speed pattern and then start normal press working operation. To provide a method of operating a machine.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention, when a plate material is pressed by a hydraulic press machine, has an empty space with a predetermined reference speed pattern set in advance. After performing the operation and detecting that the actual speed pattern is within the tolerance of the predetermined reference speed pattern, the normal press working operation is started.

(Operation) By adopting the operating method of the hydraulic press machine of the present invention, no matter what kind of oil having different performance is used for the oil supplied to the hydraulic cylinder of the hydraulic press, the oil is not heated. , Warm up so that the actual speed pattern falls within the tolerance of the predetermined reference speed pattern. When it is detected that the actual speed pattern is within the tolerance of the predetermined reference speed pattern, the regular press working operation is started.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 5, a turret punch press 1 as a press machine has a frame 3, and an upper turret and a lower turret rotatable around a vertical axis (Z axis) are provided above and below the frame 3. It is arranged at a predetermined interval. A large number of punches are attached to the plane position of the upper turret, and a large number of dies are attached to the plane position of the lower turret facing the punches.

A cylinder device 5 having a vertically movable ram is provided at the center of the frame 3. The ram is arranged above the upper turret and presses the punch located below it against the die.

A Y-axis guide rail 7 is provided on the side surface of the frame 3. The Y-axis guide rail 7 is provided with a moving member that is guided in the Y-axis direction by a Y-axis servomotor.
A table 9 having a free bearing is fixed to the upper surface of the moving member.

A carriage 11 that is movable in the X-axis direction by an X-axis servomotor is provided at the Y-axis end of the table 11. The carriage 11 is provided with a plate material clamp device that grips the plate material W placed on the table 9 and guides the plate material W in the XY plane.

The turret punch press 1 having such a configuration is used in the NC device 13
Guides the carriage 11 in the XY plane and drives the cylinder device 5 in a timely manner.
It is possible to perform a predetermined drilling process at a predetermined position of.

FIG. 1 is a block diagram of a control system showing an outline of the NC device 13 and an outline of the cylinder device 5 and its hydraulic circuit.

As shown in the figure, in the cylinder device 5, a piston 5B is mounted in a cylinder 5A, and a ram 5C which is movable in the vertical direction (Z-axis direction) is projected downward and integrated with the piston 5B. There is. A plate material clamp device 15 is attached to the carriage 11 to clamp and unclamp the plate material W.

A plurality of punches 17 are mounted on the upper turret, and a plurality of dies 19 corresponding to the punches 17 are mounted on the lower turret. On the lower surface of the cylinder 5A, there are rolling wheels 5C.
And a pulse encoder 21 for detecting the movement of the ram 5C by the pulse signal PS is attached.

The hydraulic circuit 23 includes a hydraulic pump OP and the cylinder 5A.
It has a servo valve 25 connected to the upper chamber and the lower chamber via pipes OL ₁ and OL ₂ . The pipe OL ₁ is provided with a pressure detector 27 that detects the hydraulic pressure of the pipe OL ₁ by an electric signal.

On the other hand, the NC device 13 includes an NC data input unit 29, a main control unit 31, an XY axis command unit 33, a Z axis command unit 35, and
It has a position detector 37 and a servo valve controller 39.

The NC data input unit 29 is connected to a CAD / CAM device (not shown) offline or online,
It receives the C data and provides this data to the main controller 31.

The main control unit 31 is operated by an operating system,
The NC data is received from the NC data input unit 29, and mainly the position control of the plate material W and the drive control of the cylinder device 5 are performed. The main controller 31 is connected to various sensors, limit switches, and other various actuators, and controls the turret punch press 1 as a whole.

The XY-axis command unit 33 receives predetermined position control data from the main control unit 31 and drives the X-axis and Y-axis servomotors to control the positioning of the plate W in the XY plane.

The Z-axis command unit 35 receives the Z-axis command data from the main control unit 31, and outputs the servo valve driving digital signal S _D to the servo valve control unit 39.

The position detector 37 integrates the pulse signals PS output from the pulse encoder 21 to detect the current position Z of the ram 5C. The pulse encoder is of a type that outputs two-phase pulse signals whose phases are different from each other by 1/4.
7 can also know the moving direction of the ram 5C based on the two-phase pulse signals.

The servo valve control unit 39 inputs the digital signal S _D from the Z-axis command unit 35 and the current position Z of the ram 5C from the position detection unit 37, and based on these input values, the Claude loop. Alternatively, an analog signal is sent to the servo valve 25 in an open loop to control the servo page 25 to a predetermined opening.

With the above configuration, the punch 17 moves up and down through the ram 5C based on the NC data sent from the NC data input unit 29 to the main control unit 31, and the plate material W placed on the die 19 is punched, for example. Will be applied.

A reference speed pattern storage unit 41 and an actual speed pattern storage unit 43 are connected to the main control unit 31, respectively. A comparison calculation unit 45 is connected to the reference speed pattern storage unit 41 and the actual speed pattern storage unit 43, and the comparison calculation unit 45 is connected to the main control unit 31.

The reference speed pattern storage unit 41 stores a reference speed pattern as shown in FIG. In FIG. 2, the reference speed pattern indicates a stroke curve of the ram 5C, which is a speed curve from the position Z _U of the top dead center to the position Z _{D of the} bottom dead center. Moreover, the reference speed pattern is composed of the curve C ₁ and the curve C _2, and has the allowable width ε ₀ .

In the actual speed pattern storage unit 43, when warming up is performed before the normal operation of the turret punch press 1 is started based on the reference speed pattern shown in FIG. 2, the oil supplied to the cylinder 5A is predetermined. Since the fluidity is not reached, as shown in FIG. ₃ , an actual velocity pattern with variations such as the curves C ₃ and C ₄ is stored.

The reference speed pattern shown in FIG. 2 and the actual speed pattern shown in FIG. 3 are taken into the comparison calculation unit 45 from the reference speed storage unit 41 and the actual speed pattern storage unit 43, respectively. Thus, the comparison calculation unit 45 compares the reference speed pattern with the actual speed pattern. That is, in FIG. 4, as the warm-up of the turret punch press 1 is started and the vertical movement of the ram 5C is repeated, the actual speed pattern becomes stable and the curve C ₀ of the actual speed pattern is obtained. Therefore, the curve C ₀ of the actual speed pattern and the curves C ₁ and C _{2 of the} reference speed pattern
Is constantly monitored to see if the curve C ₀ of the actual speed pattern falls between the curves C ₁ and C ₂ of the reference speed pattern, that is, whether it falls within the allowable width ε _0. To do. Thus, the actual speed pattern curve C ₀
When, for example, the curve C ₁ and the curve C ₂ of the reference pattern are continuously entered a preset number of times, it is determined that the oil supplied to the cylinder 5A has reached a predetermined fluidity, and the cylinder 5
A signal indicating that the warming-up of A is completed is sent from the comparison calculation unit 45 to the main control unit 31, and the turret punch press 1 is once stopped. Then, a desired speed pattern is sent from the NC data input unit 29 to the main control unit 31, and the plate material W is subjected to regular press working such as punching based on the desired speed pattern.

As described above, before the regular operation of the turret punch press 1 is started, whether or not the oil supplied to the cylinder 5C has reached the predetermined fluidity is determined by comparing the actual speed pattern with the reference speed pattern. Therefore, it is not necessary to control the temperature of the oil supplied to the cylinder 5A by the conventional heater. Moreover, no heater is required. Further, in the normal operation by the turret punch press 1, the number of defective products is reduced as compared with the conventional case.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, since the configuration is as described in the claims, the oil supplied to the hydraulic cylinder of the hydraulic press No matter what kind of oil with different performance is used, warming up is performed so that the actual speed pattern falls within the tolerance of the predetermined reference speed pattern without heating the oil. Then, when it is detected that the actual speed pattern is within the tolerance of the predetermined reference pattern, the regular press working operation with the desired speed pattern is started. Therefore, it is not necessary to warm the oil supplied to the hydraulic cylinder with a heater or the like to control the temperature of the oil, and the heater is not required.

Further, since the oil supplied to the hydraulic cylinder is controlled by the fluidity, the number of defective products due to regular press working is reduced as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a block diagram of a control system showing an outline of an NC device which is a main part of the present invention and an outline of a cylinder device and its hydraulic circuit. FIG. 2 shows an example of the reference speed pattern stored in the reference speed pattern storage unit. FIG. 3 is an example of an actual speed pattern stored in the actual speed pattern storage unit. FIG. 4 is an example of a reference speed pattern and an actual speed pattern that are compared by the comparison calculation unit. FIG. 5 is a perspective view of a turret punch press as a press machine according to an embodiment of the present invention. 1 ... Turret punch press 13 ... NC device, 31 ... Main control unit 41 ... Reference speed pattern storage unit 43 ... Actual speed pattern storage unit 45 ... Comparison calculation unit

Claims (1)

[Claims] 1. When a plate material is pressed by a hydraulic press machine, idle operation is performed with a predetermined reference speed pattern set in advance, and an actual speed pattern falls within an allowable range of the predetermined reference speed pattern. A method for operating a hydraulic press machine, characterized in that after the fact is detected, a regular press working operation is started.