JP3970366B2 - Punch press molding method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a punching press forming method and apparatus for forming a plate-like workpiece.
[0002]
[Prior art]
Conventionally, in a punch press equipped with a hydraulic cylinder that hits the punch with a ram, in order to obtain the desired forming height for the punch and die forming mold, the ram stroke is gradually changed and tested repeatedly. The molding process (trial shot) is performed. In other words, the desired forming height is determined by gradually increasing the lower end position of the ram at the time of trial hitting.
[0003]
[Problems to be solved by the invention]
By the way, in the molding method and apparatus in the conventional punch press, particularly when a new molding die is delivered to the customer, a desired molding height for the new molding die is obtained using the customer's punch press. I have tried many times to do this. In order to make a trial molding of a new molding die as described above, there is a problem that the customer needs a lot of trial molding time and a molding material for trial molding.
[0004]
The present invention has been made in order to solve the above-mentioned problems, and its purpose is to eliminate time-testing and waste of test-molding molding materials by eliminating trial-testing of new molding dies at customers. An object of the present invention is to provide a punch press molding method and apparatus which are omitted.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a punch press forming method according to the present invention according to claim 1 struck a punch with a ram that can be moved up and down by a hydraulic cylinder, and forms a workpiece by a forming die of the punch and die. in molding method of a punch press, with representing the desired mold height obtained during experimental molding by the molding die on the falling edge parameter represented by the falling edge position of the ram, during the trial molding The forming tonnage is expressed by a pressure parameter represented by the pressure of the hydraulic cylinder when the descending end parameter is obtained, and both the descending end parameter and the pressure parameter are previously input to the storage device of the punch press control device, At the time of actual product forming, at least one of the detected lower end position of the ram and the pressure of the hydraulic cylinder is stored in the storage device. It is characterized in that after stopping the descent of the ram when it reaches the value of the end parameter or pressure parameters by increasing the ram to terminate the molding.
[0006]
Therefore, the storage device of the punch press control device includes, for example, a lower end position of the ram that represents a desired molding height obtained at the time of trial molding (trial driving) for a new molding die on the mold manufacturer side. By inputting in advance both the lower end parameter and the pressure parameter indicating the pressure of the hydraulic cylinder when the lower end parameter is obtained as the forming tonnage at the time of molding, the actual work at the customer In the molding process, an appropriate molded product can be obtained by performing the molding process using at least one of the descending end parameter and the pressure parameter without performing a test punch on a new molding die.
[0007]
According to a second aspect of the present invention, there is provided a punch press molding apparatus comprising a hydraulic cylinder having a ram for striking a punch in the punch press, and supplying and discharging pressure oil from a hydraulic supply source to the hydraulic cylinder. Experimental test using a valve for adjusting the vertical movement position, a position detection device for detecting the lower end position of the ram, a pressure sensor for detecting the pressure when the hydraulic cylinder is pressurized, and a punch and die molding die the desired forming height Do obtained at the time of molding, and falling edge parameter represented by the falling edge position of the ram, and a pressure parameter represented by the pressure of the hydraulic cylinder when obtaining the lowering end parameter in advance The storage device for storing, the lower end position of the ram detected by the position detecting device during actual molding, or the pressure of the hydraulic cylinder detected by the pressure sensor A control device for controlling the valve so that the lowering of the ram stops and rises to finish the molding process when at least one of the values of the lowering end parameter or the pressure parameter stored in advance in the storage device has been reached It is characterized by comprising.
[0008]
Therefore, in the same manner as in the first aspect, the storage device of the punch press control device has, for example, a desired molding obtained at the time of a trial molding process (trial driving) for a new molding die on the manufacturer side. a falling edge parameters falling edge position of the ram representing the height, enter the number of molding tons at the time of molding to advance in the control device both parameters of the pressure parameter representing a pressure of the hydraulic cylinder when obtaining the lowering end parameter Keep it.
[0009]
At the time of actual workpiece forming at the customer, at least one of the lower end position of the ram detected by the position detection device or the pressure of the hydraulic cylinder detected by the pressure sensor is stored in advance in the storage device. When the value of the end parameter or the pressure parameter is reached, the valve is controlled by the control device to stop and raise the ram, so that the customer can perform the proper molding without trying a new mold. A processed product is obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a forming method and apparatus in a punch press according to the present invention will be described with reference to the drawings.
[0011]
Referring to FIG. 2, for example, a turret punch press 1 as a punch press according to this embodiment is a frame in which both sides of an upper frame 9 are supported by side frames 5 and 7 erected on both sides of a base 3. It consists of a structure. A disc-shaped upper turret 13 provided with various types of punches 11 is detachably mounted on the lower portion of the upper frame 9. A lower turret 15 facing the upper turret 13 is rotatably mounted on the upper surface of the base 3, and a large number of dies 17 facing various types of punches 11 are arcuately formed on the lower turret 15. And is detachably mounted. The axis of the upper turret 13 and the axis of the lower turret 15 are arranged on the same axis, and the upper turret 13 and the lower turret 15 are provided by an appropriate control device (not shown) such as a numerical control device. It is rotated in the same direction by control.
[0012]
A ram 19 is mounted on the lower surface of the upper frame 9 so as to be movable up and down. The ram 19 is connected to the lower end of the ram 23 of the hydraulic cylinder 21 mounted on the upper frame 9. The punch 11 is indexed and positioned below the ram 19 by the rotation of the upper turret 13 and the lower turret 15, and the ram 19 is also moved up and down by the vertical movement of the piston rod 23 of the hydraulic cylinder 21. The punch 11 is hit by 19.
[0013]
The turret punch press 1 is provided with a movement positioning device 25 for moving and positioning the workpiece W in the front-rear and left-right directions, and the workpiece W is gripped by the gripping device 27. The movement positioning device 25 is controlled by a control device such as numerical control to position the workpiece W at an appropriate position between the punch 11 and the die 17.
[0014]
Therefore, after the plate-like workpiece W is positioned between the punch 11 attached to the upper turret 13 and the die 17 attached to the lower turret 15 and the die 17 indexed to the machining position, When the punch 11 is hit, the workpiece W is formed by the punch 11 and the die 17.
[0015]
Hereinafter, the hydraulic cylinder 21 and the control device that controls the stroke of the hydraulic cylinder 21 according to the example of the present embodiment will be described in detail.
[0016]
Referring to FIG. 1, the pressurizing chamber 29 and the back pressure chamber 31 of the hydraulic cylinder 21 are connected to a hydraulic pressure supply source via, for example, a servo valve 33 (position adjustment valve). By switching the servo valve 33, the hydraulic pump 35 is operated to supply the pressure oil from the hydraulic supply source to the pressurizing chamber 29 (or the back pressure chamber 31), and the back pressure chamber 31 (or the pressurizing chamber 29). The pressure oil is configured to be discharged to the hydraulic tank 37. Accordingly, the piston rod 23 of the hydraulic cylinder 21 can be adjusted in the vertical movement position by switching the servo valve 33, so that the stroke amount S of the ram 19 can be freely adjusted.
[0017]
The hydraulic cylinder 21 is provided with a position detection device 39 for detecting the lower end position of the ram 23. The position detection device 39 is electrically connected to the servo valve 33 and a control device 41 described later. ing.
[0018]
As the position detection device 39, for example, a position detector 43 such as a potentiometer for detecting the position of the piston rod 23 is fixed to the side wall of the hydraulic cylinder 21, and this position detector 43 is a servo amplifier 45. The servo valve 33 is electrically connected to the control device 41 via the servo valve 33.
[0019]
When the position command voltage from the control device 41 is input to the servo amplifier 45, a current flows through the solenoid SOL1 of the servo valve 33, the servo valve 33 is opened, and the hydraulic cylinder 21 is operated. The position of the hydraulic cylinder 21 is fed back to the servo amplifier 45 by a detection signal detected by the position detector 43. The vertical movement of the hydraulic cylinder 21 is controlled by the position command voltage and the feedback voltage input to the servo amplifier 45. For example, when the position command signal input to the servo amplifier 45 turns on the solenoid SOL 1 and operates the servo valve 33, the pressure oil from the hydraulic supply source is supplied to the pressurizing chamber 29 of the hydraulic cylinder 21, and the back pressure chamber 31. Is discharged to the hydraulic tank 37 and the piston rod 23 is lowered. When it is detected that the piston rod 23 has been lowered to the desired stroke amount S, the detection signal of the position detector 43 is input to the servo amplifier 45, whereby the solenoid SOL1 is turned OFF and the servo valve 33 is closed and stopped. . Next, the solenoid SO2 is turned on, the servo valve 33 is operated, and the piston rod 23 is raised.
[0020]
A pressure sensor 49 is provided in a pipe 47 between the pressurizing chamber 29 of the hydraulic cylinder 21 and the servo valve 33, and the pressure sensor 49 is electrically connected to the control device 41. The pressure of the hydraulic cylinder 21 when the hydraulic cylinder 21 is lowered and the ram 19 hits the punch 11 via the piston rod 23 is detected by the pressure sensor 49, and the detected signal is input to the control device 41. Is done.
[0021]
The control device 41 includes an input device 51, a display device 53, a memory 55 (storage device), and a comparison / judgment device 57, and each is electrically connected to a central processing unit 59.
[0022]
In the molding process of the punch 11 and the die 17 of the turret punch press 1 by the molding die 61, factors such as the molding depth (molding height) of the punch 11 with respect to the die 17 and the pressing force of the hydraulic cylinder 21 are molded products. It has a great influence on the accuracy and molding processing speed.
[0023]
The molding height is represented by a stroke amount S at the lower end position of the ram 19, and this stroke amount S is represented as a “lower end parameter” in the control device 41, and this lower end parameter is one parameter of the molding parameter. .
[0024]
Further, the molding tonnage when the punch 11 is struck by the ram 19 is expressed as a “pressure parameter” by the pressurizing force of the hydraulic cylinder 21 in the control device 41, and this pressure parameter is another parameter of the molding parameter.
[0025]
These descending end parameters and pressure parameters are input by the input device 51 and stored in the memory 55 in advance.
[0026]
The comparison / judgment device 57 uses the descent end parameter and pressure parameter data stored in advance in the memory 55 for the descent end position of the ram 19 from the position detection device 39 and the hydraulic cylinder 21 in the actual molding process. When the at least one of the lower end position of the ram 19 or the pressurizing force of the hydraulic cylinder 21 reaches the value of the lower end parameter or the pressure parameter, the control device 41 controls the servo amplifier described above. The servo valve 33 is configured to issue a command to stop and raise the ram 23 of the hydraulic cylinder 21 via 45.
[0027]
The operation will be described below based on the configuration of the turret punch press 1 described above.
[0028]
When the manufacturer manufactures a new molding die 61 and then trial-tests the new molding die 61 using the manufacturer's turret punch press, the punch 11 and the die 17 are molded into a desired molding die 61. In order to obtain the height, the stroke amount S of the ram 19 is gradually changed. In other words, the lower end position of the ram 19 is gradually deepened to determine a desired molding height. The pressurizing force of the hydraulic cylinder 21 when the desired forming height is obtained is also detected by the pressure sensor 49 of the turret punch press on the manufacturer side, and this pressing force is used as pressure parameter data and the forming height is lowered. Obtained and stored as end parameter data.
[0029]
When the new molding die 61 is delivered to the customer, the data of the pressure parameter and the descending end parameter obtained when the manufacturer molds the new molding die 61 is used in the present embodiment. It is input using the input device 51 into the control device 41 of the customer's turret punch press 1 according to the example.
[0030]
Therefore, the customer's turret punch press 1 can perform an actual molding process without making a trial punch for the new molding die 61. That is, when an actual product is formed, when the piston rod 23 of the hydraulic cylinder 21 descends against the workpiece W positioned on the turret punch press 1 and strikes the punch 11 via the ram 19, A detection signal from the position detector 43 that detects the lower end position and a detection signal from the pressure sensor 49 that detects the pressure applied to the hydraulic cylinder 21 are sent to the control device 41.
[0031]
At least one of the descending end position of the ram 19 and the applied pressure of the hydraulic cylinder 21 has reached the value of the descending end parameter or pressure parameter stored in advance in the memory 55 by the comparison / judgment device 57 in the control device 41. When the control device 41 generates a command to the servo valve 33, the lowering of the ram 23 of the hydraulic cylinder 21 stops and then rises, and the workpiece W is finished at a desired molding height.
[0032]
In addition, this invention is not limited to the example of embodiment mentioned above, It can implement in another aspect by making an appropriate change.
[0033]
【The invention's effect】
As can be understood from the example of the embodiment as described above, according to the invention of claim 1, the storage device of the control device of the punch press includes, for example, a trial molding process for a new molding die on the manufacturer side. a falling edge parameters falling edge position of the ram representing the desired mold height obtained when (test hitting Chi), a pressure parameter indicative of the pressure of the hydraulic cylinder when the number of molding tons during molding to obtain the lowering end parameter By simply inputting both of these, the control device can perform the forming process at the desired forming height without actually trying a new forming die at the time of forming the actual workpiece at the customer. Therefore, an appropriate molded product can be obtained.
[0034]
According to the invention of claim 2, the effect is the same as that of the above-mentioned claim 1, for example, the manufacturer needs to perform a test molding (testing) on a new molding die, and at this time can be obtained for the falling edge parameters falling edge position of the ram representing the forming height, and a pressure parameter indicative of the pressure of the hydraulic cylinder when the number of molding tons during molding to give the falling edge parameter.
[0035]
When actually molding a workpiece at the customer, the lowering end parameter and the pressure parameter are input in advance into the storage device of the customer punch press control device without performing a test punch on a new molding die. As a result, the valve is controlled by the control device to stop the lowering of the ram at a desired molding height and then lifted, so that an appropriate molded product can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of an embodiment of the present invention and schematically showing a hydraulic cylinder and a control device that controls the stroke of the hydraulic cylinder.
FIG. 2 is a side view of a turret punch press showing an example of an embodiment of the present invention.
[Explanation of symbols]
1 Turret punch press (punch press)
11 Punch 13 Upper turret 15 Lower turret 17 Die 19 Ram 21 Hydraulic cylinder 23 Ram 29 Pressurization chamber 31 Back pressure chamber 33 Servo valve 39 Position detection device 41 Control device 43 Position detector 49 Pressure sensor 55 Memory (storage device)
57 Comparison Judging Device 61 Mold

Claims (2)

In a punch press molding method in which a punch is struck by a ram that can be moved up and down by a hydraulic cylinder, and a plate-shaped workpiece is molded by a molding die of this punch and die.
A desired molding height obtained during a trial molding process by the molding die is represented by a descending end parameter represented by a descending end position of the ram, and a molding tonnage during the trial molding is represented by the descending end. Represented by the pressure parameter represented by the pressure of the hydraulic cylinder when the parameter was obtained, both the descending end parameter and the pressure parameter are input in advance to the storage device of the punch press control device,
During actual product forming, the ram is lowered when at least one of the detected lower end position of the ram or the pressure of the hydraulic cylinder reaches the lower end parameter or pressure parameter value stored in the storage device. A punch press molding method characterized in that after stopping, the ram is raised to finish the molding process. A hydraulic cylinder with a ram for striking a punch in a punch press;
A valve that adjusts the vertical movement position of the ram by supplying and discharging pressure oil from a hydraulic supply source to the hydraulic cylinder;
A position detecting device for detecting a lower end position of the ram;
A pressure sensor for detecting a pressure when the hydraulic cylinder is pressurized;
A falling edge parameter represented the desired forming height obtained during experimental molding by the molding die of the punch and die at the falling edge position of the front Symbol ram of the hydraulic cylinder when obtaining the lowering end parameter a storage unit for previously storing a pressure parameter represented by pressure,
At least one of the lower end position of the ram detected by the position detection device or the pressure of the hydraulic cylinder detected by the pressure sensor at the time of actual molding is a lower end parameter or pressure parameter stored in advance in the storage device. And a control device for controlling the valve so that the lowering of the ram stops and rises to finish the forming process when the value is reached.

Images