JPH07124846A - Warming-up time control device of machine tool - Google Patents

Abstract

PURPOSE:To provide a warming-up time control device which is adapted to a machine tool using hydraulic actuators, such as a plate bending machine, generates no wasteful operation stop by an accuracy confirming means and the like owing to a high viscosity of a cooled operating oil, and can carry out a warming-up smoothly. CONSTITUTION:In this control device adapted to a control device to control a machine tool having hydraulic actuators 19, and 30 to 33 depending on a processing program 51, a selecting switch 61 of a warming-up mode is provided. In the mode selecting time, the position allowable value Z1 in the object position reaching deciding means 57 of a hydraulic servo system 47 is increased or ignored. And in the warming-up mode, the set value t1 of the position reaching time of a reaching time deciding means 53 is increased or ignored. Furthermore, a means 55 to omit a specific operation in the warming-up mode condition is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm-up control device for a plate bending machine, a punch press, and other machine tools using a hydraulic actuator.

[0002]

2. Description of the Related Art Conventionally, there are some control devices such as plate bending machines which are provided with a mode called test and repeat for performing a test operation without a work or for a warm-up operation. In this mode, control is performed to ignore the signal when there is no work or to ignore the work non-detection signal after a lapse of a predetermined time by a timer. When this mode is used, useless automatic stop is not performed in the operation confirmation operation or the like in which the operation is simply performed without a work, and the continuous operation can be favorably performed.

[0003]

However, in the warm-up operation, even if the test and repeat mode is set, there are many cases where the machine automatically stops due to generation of unnecessary alarms and cautions. In other words, in machine tools such as plate bending machines, many hydraulic actuators such as hydraulic cylinders and hydraulic index motors are used, but since the hydraulic oil is cold and highly viscous during warm-up operation in the first morning, The movement of the hydraulic actuator is worse than normal.
Therefore, it may not move to the target position, or even if it can move, it may take a longer time than usual. For this reason, an alarm may be issued by various means for confirming the operating state of the machine, or the machine may stop because the next operation cannot be performed.

For example, in a plate material folding machine provided with a rotary pad for rotating the plate material, after the positioning and rotation of a predetermined angle, the meshing coupling is coupled to hold the angle of the plate material.
In this case, the coupling cannot be joined unless the positioning with a certain degree of accuracy is completed, but during warm-up operation, it may not be able to rotate to the target position and may stop there. The warm-up operation is only for smoothing the movement of each part of the machine, so there is no need to connect the coupling as described above, and there is no need for an alarm of inaccuracy. The alarm is a waste of time for the operator.

An object of the present invention is to provide a warm-up operation control device for a machine tool which can smoothly perform warm-up operation without causing unnecessary operation stop.

[0006]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The present invention is applied to a control device that controls a machine tool having hydraulic actuators (19, 30 to 33) according to a machining program (51). In the first aspect of the present invention, in the control device, the warm-up operation mode selection means (61) and the allowable value for determining the arrival of the hydraulic servo system (47) at the target position during the normal operation when the means (61) is selected. A target position arrival determining means (57) is provided which is set to be larger than the time or ignores the allowable value and determines that the vehicle has always arrived. According to the second aspect of the present invention, the warm-up operation mode selecting means (61) and the setting value of the allowable arrival time to the target position of the hydraulic servo system (47) are set larger than those in the normal operation when the means (61) is selected. Or an arrival time determination means (53) for deciding that the set value has been ignored and the time has always arrived. In the third aspect of the present invention, there is provided warm-up operation mode selection means (61) and operation omitting means (55) for omitting a predetermined operation of the machine tool and shifting to the next operation when selecting this means (61). Set up.

[0007]

In the controller according to the first aspect of the invention, in the warm-up operation mode, the hydraulic oil is cold and the hydraulic actuators (19, 30 to 33) reach the normal allowable value (Z1) with respect to the target value of the hydraulic servo system (47). Even if is unable to operate, the target position is determined to have been reached if it operates up to the warm-up operating permissible value (Z2) set to be larger than the permissible value (Z1). Alternatively, it is determined that the allowable value (Z1) is ignored and that the vehicle always arrives. In the device of the second aspect of the invention, in the warm-up operation mode, the hydraulic oil is cold and the hydraulic servo system (47)
Even if the hydraulic actuators (19, 30 to 33) cannot operate by the normal permissible time to reach the target position (t1), within the warm-up operation set time (t2) set to be larger than the time (t1). When it operates, it is determined that it has arrived within the time. Alternatively, it is determined that the set time (t1) is ignored and that the time has always been reached. In the third invention device, in the warm-up operation mode, the predetermined operation of the machine tool is omitted, and only the other operation is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. First, the configuration of the plate bending machine will be described. As shown in FIG. 2, the plate material folding machine A includes a mold part 1 and a plate material feeding device 3. The die unit 1 includes an upper die 25 attached to a ram 24 and driven up and down by a hydraulic cylinder 33, a lower die 26 fixed to a body frame 28, and a plate material W sandwiched by these upper and lower dies 25, 26. And a bending die 27 for bending the end portion upward or downward.

The bending die 27 is attached to the tip of a rocker arm 29, and the rocker arm 29 is vertically swung by the three hydraulic cylinders 30 to 32 and is moved back and forth for adjusting clearances for the upper and lower dies 25 and 26. Is possible. The upper die 25 can be changed in die width by a die width changing mechanism 35.

The plate material feeding device 3 is provided with a table 2 on which the plate material W is placed, and a carriage 4 which holds the plate material W on the table 2 with a main clamp 5 and moves it back and forth (X axis direction). The carriage 4 is installed on the bed 13 via rails, and is fed back and forth by a feed screw 14 and a servomotor 15 for driving the feed screw 14. The main clamp 5 includes a pair of pads 5 that sandwich the plate material W from above and below.
a and 5b, and a hydraulic index motor 19 for driving the lower pad 5b to rotate.
Rotate every 0 °). The upper pad 5a is attached to an elevating holder 18 which can be moved up and down along a vertical rail 17 provided at the tip of the carriage 4, and is lifted and lowered by an elevating device 16 such as a cylinder device. Further, the lower pad 5b is provided with a coupling 34 (FIG. 1) for fixing the rotation angle in a meshed state at a predetermined indexing angle.

FIG. 3 is a plan view of the plate material feeding device 3. The table 2 has a carriage passage 10 that allows the carriage 4 to pass therethrough in the center, and is composed of a large number of strip-shaped plates 2a. A centering pin 8 for determining the width of the plate material W projects in a gap 9 between the strip-shaped plates 2a of the table 2 so as to project and retract, and is projected and retracted at the front edge of the table 2 by a cylinder device (not shown). An end locator 11 for front-back positioning is provided.

A pair of sub-carriage 6 is installed on both sides of the carriage 6 so as to be movable back and forth via rails 21, and a sub-clamping device 7 for replacing the plate material is provided at the front end of the sub-carriage 6. The sub-carriage 6 is driven back and forth by a feed screw 22 (FIG. 2) and a servo motor 23 installed on the carriage 4.

FIG. 1 is a conceptual diagram of a control system. The ram drive hydraulic cylinder 33 is driven by a motor 46 via a servo valve 45. The servo valve 45 is controlled by a hydraulic servo controller 48 that performs feedback control based on the detection value of the stroke position detector 33 of the hydraulic cylinder 33. Each of the other hydraulic cylinders 30 to 32 also has stroke position detectors 40 to 42, and the hydraulic index motor 19 also has a position detector 44 composed of a rotary encoder. The motors 19 are also servo valves (not shown).
Feedback control is performed by the hydraulic servo controller 48 via the. These hydraulic servo controllers 48,
Servo valve 45 and each hydraulic actuator 19,
A hydraulic servo system 47 is composed of 30 to 33 and the like.

The control device 50 is a device for controlling the entire plate bending machine, and is composed of a CNC device (computer type numerical control device) and a PMC device (programmable machine controller). The numerical control function unit 52 of the control device 50 executes the machining program 51 and mainly outputs the axis feed command to the hydraulic servo controller 47 and the servo controllers (not shown) of the other axis motors 15 and 23. is there. Each sequence command of the machining program 51 is transferred from the numerical control function unit 52 to the sequence operation control means 54, and executed according to the setting program of this means 54. The sequence operation control means 54 performs sequence control of the entire machine, and a part thereof includes a coupling command means 54a for performing engagement / disengagement control of the coupling 34 of the rotary pad 5b.

In the control system having such a basic structure, according to the present invention, the operation panel 59 has a test mode selecting means 60 including a mode selecting switch and a warming-up operation mode selecting means 6.
1 and the following means for operating in response to the mode selection are provided. That is, the target position arrival determination means 5
7 is provided in the hydraulic servo controller 57, and arrival time determination means 53, operation omission means 55, warm-up operation completion determination means 58, and test and repeat mode execution means 56 are provided in the control device 50.

The target position arrival determining means 57 is a means for determining whether or not each of the hydraulic cylinders 30 to 33 and the hydraulic motor 19 has moved to the target position of the feed command, and the target position at the time of normal operation. A permissible value Z1 and a warm-up operating permissible value Z2 in a range larger than the permissible value Z1 are set for each operation of the cylinders 30 to 33 and the hydraulic motor 19, respectively.

The arrival time determination means 53 is a means for determining whether or not each of the hydraulic cylinders 30 to 33 and the hydraulic motor 44 has reached the target position within the set time, and the set time t1 in the normal operation and the set time t1. Longer warm-up time set time t2
Are set for the respective operations of the hydraulic cylinders 30 to 33 and the hydraulic motor 44. Arrival time determination means 5
When it is determined by 3 that the time has not been reached within the set time, the signal of the determination result causes an alarm to call the operator by a predetermined means (not shown) and the entire machine is stopped.

The operation omitting means 55 is a means for omitting a predetermined operation from among the operation set in the sequence control means 54 and the sequence operation set in the machining program 51 to perform the next operation. . The test-and-repeat mode execution unit 56 is mode-selected by the test mode selection unit 60, ignores the detection signals of various work detection switches, and performs the next operation regardless of the presence or absence of the signals, and It is a means of stopping the generation of alarms. Test and repeat mode execution means 56
Is executed also when the mode is selected by the warming-up operation mode selection means 61.

Next, the operation of the above configuration will be described. First, a general bending operation by the processing program 51 will be described. The plate material W loaded on the work table 2 in FIG.
After being positioned in the front-rear and left-right directions, the center part is clamped by the main clamp 5 of the carriage 4, and is fed into the mold part 1 as the carriage 4 advances. The plate material W sent in is
The upper mold 25 and the lower mold 26 shown in FIG. 2 are sandwiched, and the protruding parts from the upper and lower molds 25, 26 are bent upward or downward by the vertical swing of the bending mold 27. When the end bending of one side of the plate material W is completed in this way, the upper mold 25 is opened upward, the carriage 4 is retracted, and the plate material W is rotated 90 ° or 180 °, and then the plate material W is moved to the mold part 1. Send again. By repeating such an operation, the edge of the plate material W on four or two sides is bent. The sub-carriage 6 is used when the size of the plate material is so small that the main clamp 5 cannot feed it to the mold unit 1, or when the gripping position by the main clamp 5 needs to be changed.

In the above-described operation, in the normal machining operation, the target position arrival determining means 57 and the arrival time determining means 53 of FIG. 1 have the normal allowable value Z1 and the normal set time t1.
To use. During this time, if the operation does not reach the normal allowable value Z1 within the normal set time t1 for each operation of the hydraulic cylinders 30 to 33 and the hydraulic motor 19, an alarm is generated according to the determination result of the arrival time determination means 53. The whole machine is stopped.

When performing the warm-up operation, the warm-up operation mode selection means 61 of the operation panel 59 is turned on. As a result, the warm-up operation allowable value Z2 and the warm-up operation set time t1 are selected for determination in the target position arrival determination means 57 and the arrival time determination means 53, and the operation omission means 55 omits the operation. Therefore, even if the hydraulic oil is cold and cannot operate up to the normal allowable value Z1 by the normal set time t1,
Allowable time t during warm-up operation set to be larger than these values
If the operation reaches the warm-up operation allowable value Z2 by the time 2, it is determined that the target position has been reached. Therefore, warm-up operation is performed without performing unnecessary operation stop.

In the warm-up operation, the number of times that the normal allowable value Z1 cannot be operated by the normal set time t1 is counted by the warm-up operation completion judging means 58, and the warm-up operation corresponding to the processing of one or a set number of plate materials. When the normal permissible value Z1 is not exceeded during the operation, the warm-up operation completion signal is activated.

Further, during the warm-up operation, the operation omitting means 55 omits a predetermined operation of the machine. For example, after the rotational positioning of the plate W by the hydraulic motor 19 is completed, the coupling 34 is usually used to hold the rotational position of the rotary pad 5b.
Is moved up and down to engage with each other, but when the positioning is completed, the next operation is performed without engaging with the coupling 34. As a result, the operation of the hydraulic motor 19 due to the high viscosity of the hydraulic oil is insufficient, so that the next operation can be performed even if the rotary pad 5b is not positioned to a predetermined accuracy, and unnecessary operation stop can be avoided.

In the above embodiment, the target position arrival determination means 57 and the arrival time determination means 53 increase the allowable value Z1 and the set time t1 during the warming up operation, but these means 57 and 53 increase the allowable value Z1 and the allowable value Z1. It is also possible to disregard the set time t1 and always perform an output to determine that the target position has been reached within the target time. Further, in the above-described embodiment, the change of the allowable value Z1 and the set time t1 at the time of warm-up operation and the omission of a part of the sequence operation are used together.
It is possible to perform only one of the three types of control such as changing to 2 or ignoring, changing or ignoring the set time t1 to t2, and omitting some operations, or combining any two types. You may do it. Further, the present invention can be applied not only to the plate bending machine but also to other various machine tools using hydraulic actuators.

[0025]

According to the first aspect of the present invention, there is provided the target position arrival determining means for increasing or ignoring the allowable position value of the hydraulic servo system in the warm-up operation mode of the machine tool. Since the arrival time determining means for increasing or ignoring the set value of the position arrival time in the operation mode is provided, and the operation omitting means for omitting the predetermined operation is provided in the third invention, in any of the inventions, useless operation stop The warm-up operation can be performed smoothly without causing

[Brief description of drawings]

FIG. 1 is a block diagram showing a conceptual configuration of an embodiment of the present invention.

FIG. 2 is a cutaway side view of the plate material folding machine.

FIG. 3 is a plan view of the plate material folding machine.

[Explanation of symbols]

3 ... Plate material feeding device, 4 ... Carriage, 5 ... Main clamp, 5a, 5b ... Rotating pad, 19 ... Hydraulic index motor, 24 ... Ram, 25 ... Upper mold, 26 ... Lower mold, 27 ...
Curved type, 30-33 ... Hydraulic cylinder, 34 ... Coupling, 40-44 ... Position detector, 46 ... Hydraulic motor, 47
... hydraulic servo system, 48 ... hydraulic servo controller, 50
... Control device, 51 ... Machining program, 53 ... Arrival time determination means, 54 ... Sequence operation control means, 55 ... Operation omitting means, 57 ... Target position arrival determination means, 61 ... Warming operation mode selection means, W ... Plate material

Claims (3)

[Claims] 1. In a control device for controlling a machine tool having a hydraulic actuator according to a machining program, a warm-up operation mode selecting means and an allowable value for determining the arrival of a hydraulic servo system at a target position are normally set when the means is selected. A warm-up operation control device for a machine tool, which is provided with a target position arrival determination means that is set to be larger than that during operation, or that always arrives ignoring the allowable value. 2. A control device for controlling a machine tool having a hydraulic actuator according to a machining program, wherein a warm-up operation mode selection means and a set value of an allowable arrival time to a target position of a hydraulic servo system are selected when the means is selected. A warm-up control device for a machine tool provided with arrival time determination means for determining that the time is set to be larger than that during normal operation or ignoring the set value and always reaching within a set time. 3. A control device for controlling a machine tool having a hydraulic actuator in accordance with a machining program, and means for selecting a warming-up operation mode, and at the time of selecting this means, skip a predetermined operation of the machine tool and proceed to the next operation. A warm-up control device for a machine tool, which is provided with means for omitting operation.