JPH05285554A - Device for automatically changing load for pressing wrinkles press - Google Patents

Abstract

PURPOSE:To obtain a proper press-formed article without cracks and wrinkles even if the passing resistance of a press material is varied when a mold temperature rises at the time of a mass production or falls at the time of recess. CONSTITUTION:By counting the number of times of press work at S7, S8, and adding 1 to a loading number N at S11 each time it reaches a specified number Co, the wrinkle pressing load is lowered in accordance with prescribed data; meantime, when the press work is resumed after an interruption, a subtraction alphais determined from the contents of a timer TI timing the stop time; and simultaneously, by subtracting the subtraction alpha from the loading number N, the wrinkle pressing load is raised in accordance with the stop time. Incidentally, by measuring the temperature at the wrinkle pressing part, the wrinkle pressing load may be changed in accordance with the measured temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine for drawing work, and more particularly to a wrinkle holding load automatic changing device for automatically changing the wrinkle holding load so that proper drawing work can be performed.

[0002]

2. Description of the Related Art Conventionally, a press machine has been widely used for drawing a pair of metal molds by moving them closer to each other. For example, FIG. 2 and FIG. 3 show an example of a single action type press machine, in which wrinkle pressing ring 30 is used for wrinkle pressing and drawing is performed by die die 18 and punch die 12. A wrinkle pressing load is applied based on Pa. 15 to 17 show an example of a double action type press machine, in which wrinkle retainer ring 156 attached to outer slide 160 performs wrinkle retainer and punch die 162 and bolster 154 attached to inner slide 164. The drawing process is performed by using the provided die dies 152, and the wrinkle pressing load is applied based on the air pressure Pe of the cylinder 184. In such a conventional press machine, the air pressures Pa, Pe and the relative distance ha (the die height are set to the die height by trial and error while performing trial striking in advance so that an appropriate wrinkle pressing load that does not cause cracks or wrinkles is applied. (Correspondence) is usually adjusted. That is, the wrinkle pressing load for performing an appropriate press working is different for each mold, and the weights of the wrinkle pressing rings 30, 156 constituting the mold are different for each mold. Since the pressure receiving area, sliding resistance, rigidity, etc. of the air cylinder 42 and the cylinder 184 differ depending on the press machine, there is no wrinkle or crack while mounting the die on the press machine that actually performs the drawing and performing trial punching. Therefore, it was necessary to adjust the wrinkle holding load, that is, the air pressure Pa and the like so as to obtain a press-formed product.

On the other hand, the weight of the mold and the wrinkle holding load capable of performing an appropriate drawing process are obtained in advance for each mold, and the sliding resistance and the pressure receiving area of the air cylinder,
The rigidity and the like are obtained in advance for each press machine, and the air pressures Pa and Pe and the relative distance ha at which the drawing processing is performed by the wrinkle holding load are automatically set based on such information. Press machines are being considered. According to such a press machine, the troublesome adjustment work due to trial and error is eliminated, the burden on the operator is greatly reduced, and a press-formed product of excellent quality can be stably obtained.

[0004]

However, according to the experiments conducted by the present inventors, even in such a press machine, defects such as cracks may occur in the press-molded product if the press working is continuously performed. There was a problem that it became easier.
This is because heat is generated due to the passage resistance when the press material passes between a pair of molds, and the temperature of the mold rises as the number of presses increases. The lubrication characteristics of the lubricating oil and the friction characteristics of the die and the press material change, and the lubricating oil easily volatilizes, increasing the passage resistance and increasing the tension when the press material is pulled in during drawing. It is considered that defects such as cracks are likely to occur in the molded product. Further, there is another problem that the wear of the mold is promoted due to the increase of the passage resistance and the life is shortened.

Examining the relationship between the above-mentioned passage resistance and the amount of heat generation, first, the amount of heat generation Qo in grinding is tangential grinding resistance Ft, grinding time τ, and grinding wheel peripheral speed V.
a, where the moving speed of the workpiece is Vb, it is expressed by the following equation (1). Applying this in the case of drawing,
Μ is the passage resistance determined by the surface roughness and lubrication conditions of the mold and press material, r is the bending and bending back resistance of the press material due to the bead in the wrinkle holding part, and f is the wrinkle holding surface pressure.
When (t), the tangential passage resistance is (μ + r) · f (t)
Since the flow rate of the press material in the tangential direction is W,
When the width of the press material is w, the heat generation amount Qs at the wrinkle holding portion can be expressed by the following equation (2). Further, since the inflow amount W is expressed by the following equation (3), the heat generation amount Qs is eventually expressed by the following equation (4). The heat generation amount Qs is generated for each press working, and the mold temperature gradually rises until the heat generation and the heat radiation are balanced. In addition,
The a in the equation (3) is a predetermined constant.

[0006]

[Equation 1] Qo = Ft · (Va ± Vb) · τ (1) Qs = (μ + r) · f (t) · W · w (2) W = a (μ + r) · ∫f (T) dt (3) Qs = (μ + r) ² · f (t) · ∫f (t) dt · w (4)

On the other hand, the tension Te when the press material is drawn in during drawing is expressed by the following equation (5), and the passage resistance μ due to changes in lubrication conditions caused by the temperature rise of the mold.
When the value is increased, the tension Te is increased even if the wrinkle pressing surface pressure f (t) is the same, and the press-formed product is likely to be cracked. As is clear from the equation (4), when the passage resistance μ increases, the heat generation amount Qs also increases,
A vicious cycle occurs in which the die temperature further rises and the passage resistance μ further increases.

[0008]

[Equation 2] Te = (μ + r) · f (t) (5)

The present invention has been made in view of the above circumstances, and an object thereof is to prevent defects such as cracks in a press-formed product even when the number of presses increases.

[0010]

In order to achieve the above object, the wrinkle holding load may be reduced according to the number of presses. The first invention is (1) of the claim correspondence diagram of FIG. As shown in, in a press machine that performs drawing while performing wrinkle holding, a device for automatically changing the wrinkle holding load when performing the wrinkling holding,
(A) Wrinkle pressing load adjusting means for adjusting the wrinkle pressing load, (b) Press number detecting means for counting the number of presses that have been continuously pressed by the press machine, and (c) the number of presses. It is characterized by further comprising wrinkle holding load control means for controlling the wrinkle holding load adjusting means such that the wrinkle holding load becomes smaller as the number of presses counted by the detecting means increases.

[0011]

In such a wrinkle pressing load automatic changing device, the number of pressings is counted by the pressing number detecting means, and as the number of pressings increases, in other words, the passage resistance μ increases due to the temperature rise of the mold. As described above, the wrinkle holding load adjusting means is controlled by the wrinkle holding load control means so that the wrinkle holding load becomes smaller, so that an appropriate tension Te can be obtained regardless of the increase of the passage resistance μ. That is, as is clear from the equation (5),
Since the tension Te generated in the press material at the time of drawing is proportional to the wrinkle pressing surface pressure f (t), if the wrinkle pressing load is reduced corresponding to the increase of the passage resistance μ caused by the temperature increase, the tension Te increases. This suppresses cracking of the press-molded product and premature wear of the mold. When the wrinkle holding load is reduced in this way,
As is clear from the equation (4), the heat generation amount Qs during the press working is small, so that the temperature rise and the increase of the passage resistance μ are suppressed, and the die temperature that balances the heat radiation amount becomes low, and the press working is generally performed. The influence of heat is reduced.

[0012]

As described above, according to the first aspect of the present invention, since the wrinkle pressing load is reduced according to the number of presses, the drawing resistance during drawing is increased regardless of the increase of the passage resistance μ due to the temperature rise of the mold. The increase in the tension Te of the press material is suppressed, cracking of the press-formed product and early wear of the die are prevented, and the heat generation amount Qs is reduced, and the die temperature that balances the heat radiation amount is lowered. The influence of heat is reduced.

[0013]

In order to achieve the above-mentioned object, the second invention is (2) of the claim correspondence diagram of FIG.
As shown in Fig. 2, in a press machine that performs drawing while performing wrinkle pressing, it is a device for automatically changing the wrinkle pressing load when performing the wrinkle pressing, and Wrinkle presser load adjusting means to be adjusted,
(B) a press number detecting means for counting the number of presses that have been continuously pressed by the press machine,
(C) time measuring means for measuring the stop time of the press machine, and (d) the greater the number of presses counted by the press number detecting means, the smaller the wrinkle holding load, and the stop measured by the time measuring means. A wrinkle holding load control means for controlling the wrinkle holding load adjusting means is provided such that the wrinkle holding load increases as the time increases.

[0014]

According to the second aspect of the present invention, the number of presses is counted by the number of presses detection means and the stop time of the press machine is measured by the time counting means. The more the number of presses, the smaller the wrinkle holding load, and the longer the stop time is. The wrinkle presser load control means controls the wrinkle presser load adjusting means so that the wrinkle presser load increases.
By reducing the wrinkle pressing load according to the number of times of pressing, similarly to the first aspect of the invention, the increase of the tension Te is suppressed regardless of the increase of the passage resistance μ, and the crack and the early wear of the mold are prevented. At the same time, the heat generation amount Qs is reduced, and the mold temperature that is in balance with the heat radiation amount is lowered, and the influence of heat is reduced in the overall press working. On the other hand, if the press machine is stopped due to a break while the wrinkle holding load is reduced in this way, the die temperature will drop due to heat dissipation according to the stop time, and the passage resistance μ
Is smaller, the tension Te may not be sufficient when the press working is restarted with the wrinkle holding load as it is, and wrinkles may easily occur in the press-formed product. Although the tension Te may become excessively large, the wrinkle pressing load is increased in accordance with the stop time in the present invention, so an appropriate tension Te can be obtained regardless of the decrease in the passage resistance μ and the generation of defective products is prevented. To be done.

[0015]

As described above, according to the second aspect of the present invention, since the wrinkle pressing load is reduced according to the number of times of pressing, the press-formed product of the press-formed product can be obtained regardless of the increase of the passage resistance μ accompanying the temperature rise of the mold. Cracking and early wear of the die are prevented, the heat generation amount Qs is reduced, and the die temperature in proportion to the heat radiation amount is lowered, so that the influence of heat is reduced in general press working.
Further, since the wrinkle pressing load is increased according to the stop time, wrinkles are prevented from occurring in the press-formed product regardless of the decrease of the passage resistance μ due to the temperature decrease of the mold.

[0016]

[Third Means for Solving the Problems] In order to achieve the above-mentioned object, the third invention is (3) of the claim correspondence diagram of FIG.
As shown in Fig. 2, in a press machine that performs drawing while performing wrinkle pressing, it is a device for automatically changing the wrinkle pressing load when performing the wrinkle pressing, and Wrinkle presser load adjusting means to be adjusted,
(B) temperature detecting means for measuring the temperature of the wrinkle holding portion where the wrinkle holding is performed, and (c) the wrinkle holding load decreases as the temperature of the wrinkle holding portion measured by the temperature detecting means increases. And a wrinkle holding load control means for controlling the wrinkle holding load adjusting means.

[0017]

In this automatic wrinkle presser load changing device, the temperature of the wrinkle presser portion is measured by the temperature detecting means, and the wrinkle presser load control means adjusts the wrinkle presser load adjusting means so that the higher the temperature, the smaller the wrinkle presser load. The wrinkle holding load is reduced when the die temperature is high and the passage resistance μ is large, while the wrinkle holding load is increased when the die temperature is low and the passage resistance μ is small. For this reason, an appropriate tension Te can always be obtained irrespective of the fluctuation of the passage resistance μ caused by the temperature change of the mold, and the occurrence of wrinkles, cracks and the like can be prevented, and the excessive tension Te can also be caused. The early wear of the die is suppressed. Further, since the amount of heat generation Qs is reduced by reducing the wrinkle pressing load according to the temperature rise, the mold temperature that is in balance with the amount of heat radiation is lowered, and the influence of heat is reduced in general press working.

[0018]

As described above, according to the third aspect of the invention, since the wrinkle holding load is controlled according to the temperature of the wrinkle holding portion, wrinkles are generated irrespective of the fluctuation of the passage resistance μ caused by the temperature change. The generation of cracks and the like and the early wear of the die are prevented, the heat generation amount Qs is reduced, and the die temperature which is in balance with the heat radiation amount is lowered, and the influence of heat is reduced in the overall press working.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is an example of a single action type press machine 10 for performing drawing work. A bolster 14 to which a punch type 12 is attached is fixedly positioned on a base (not shown) via a bed 16, while a die is used. The slide plate 20 to which the mold 18 is attached is vertically moved by four plungers 22. The bolster 14 is provided with a large number of through holes 26 for disposing the cushion pins 24, and below the bolster 14, a cushion pad 28 for supporting the cushion pins 24 is disposed. . The cushion pin 24 supports the wrinkle pressing ring 30 arranged together with the punch die 12, and is arranged in an arbitrary number at a predetermined position according to the shape of the wrinkle pressing ring 30. It The punch die 12, the wrinkle retainer ring 30, and the die die 18 correspond to a pair of dies that are detachably attached to the press machine 10 and are used. The die die 18 and the wrinkle retainer ring 30 form a peripheral edge of a press material. Drawing is performed by the punch die 12 and the die die 18 while pressing the portion with wrinkles.

The cushion pad 28 has a large number of hydraulic cylinders 32 corresponding to the through holes 26.
The lower ends of the cushion pins 24 are brought into contact with the pistons of the hydraulic cylinders 32.
The pressure chambers of these hydraulic cylinders 32 are communicated with each other, and hydraulic oil is supplied from the electric pump 34 and the electromagnetic on-off valve 36 is controlled to open and close,
The oil pressure Ps in the pressure chamber is adjusted. This hydraulic pressure Ps is detected by the hydraulic pressure sensor 38, and at the same time, the cushion pin 24 is pressed against the wrinkle pressing load F.
It is adjusted so that s acts substantially uniformly.

The cushion pad 28 can be moved vertically while being guided by a guide 40, and is always urged upward by an air cylinder 42. The pressure chamber of the air cylinder 42 is communicated with an air tank 44, and the air tank 44 is connected to a pressure air source 48 in the factory via an electromagnetic ON / OFF air supply / exhaust valve 46.
By controlling the switching of the FF air supply / exhaust valve 46, the air pressure Pa in the pressure chamber or the air tank 44 is adjusted. The air pressure Pa is detected by the air pressure sensor 50 and adjusted according to the wrinkle pressing load Fs.

On the other hand, the plunger 22 is connected to the slide plate 20 via a die height adjusting mechanism 52, as shown in FIG. The die height adjusting mechanism 52 is disposed on a screw shaft 54 integrally provided on the plunger 22, a nut member 56 screwed to the screw shaft 54, and a worm wheel 58 fixed to the nut member 56. And a servomotor 60 for rotationally driving the worm screwed onto the worm wheel 58. The worm wheel 58 and the nut member 56 are rotationally driven in both forward and reverse directions by the servo motor 60, so that the height position of the die height adjusting mechanism 52 with respect to the screw shaft 54, that is, the relative distance h between the plunger 22 and the slide plate 20. Is changed. The relative distance h is detected by the rotary encoder 59 (see FIG. 4) provided in the servo motor 60. As the relative distance h increases, the slide plate 20 is lowered with respect to the plunger 22, and the pressing force when the plunger 22 reaches the lower end is changed. It is adjusted according to the press load Fp. It should be noted that the four plungers 22 are mounted on the slide plate 20 via the die height adjusting mechanism 52.
And the relative distance h is adjusted respectively.
Further, a strain gauge 61 is attached to each plunger 22, and each load Foi (i = 1, 2, 3, 4) acting on each plunger 22 is detected.

The die height adjusting mechanism 52 is a piston 6 of a hydraulic cylinder 62 provided to prevent overload.
4, while the housing of the hydraulic cylinder 62 is integrally arranged on the slide plate 20. The pressure chamber of the hydraulic cylinder 62 is filled with hydraulic oil, and the pressure chamber is communicated with the oil chamber 68 of the cylinder 66. Air chamber 70 of cylinder 66
Is connected to an air tank 72, and the air tank 72 is an electromagnetic ON / OFF supply / exhaust valve 7
4 is connected to the pressure air source 48 via
By controlling the switching of the N, OFF supply / exhaust valve 74, the air pressure Pc in the air chamber 70 and the air tank 72 is adjusted. The air pressure Pc is detected by the air pressure sensor 76. This air pressure Pc causes the piston to retreat to the air chamber 70 side when an excessive load is applied to the hydraulic cylinder 62, causing the die height adjusting mechanism 52 to move.
And the slide plate 20 are allowed to approach each other, and the pressure is adjusted according to the press capability of the press machine 10 so as to prevent damage to the press machine 10, the mold, and the like. The hydraulic cylinders 62, the cylinders 66, the air tank 72, etc. are arranged at the connecting portions of the four plungers 22 and the slide plate 20, respectively, and the air pressure Pc is respectively set.
Is regulated.

The slide plate 20 is connected to four balancer air cylinders 80 arranged in the machine frame 78 (see FIG. 2) of the press machine 10. The pressure chamber of the air cylinder 80 is communicated with an air tank 82, and the air tank 82 is an electromagnetic ON / O type.
The pressure air source 48 is connected via the FF air supply / exhaust valve 84, and the air pressure Pb in the pressure chamber or the air tank 82 is adjusted by switching control of the ON / OFF air supply / exhaust valve 84. Has become. This air pressure P
The pressure b is detected by the air pressure sensor 86 and adjusted so as to balance with the weights of the slide plate 20 and the die die 18. The pressure chambers of the four air cylinders 80 are connected to a common air tank 82.

The press machine 10 is equipped with a controller 90 as shown in FIG. 4, and outputs from the air pressure sensors 50, 86, 76, the hydraulic pressure sensor 38, the rotary encoder 59, and the strain gauge 61. Air pressure P
Signals representing a, Pb, Pc, hydraulic pressure Ps, relative distance h, and load Foi are supplied to the controller 90, respectively. The controller 90 is composed of a microcomputer having a CPU, a RAM, a ROM, an input / output interface circuit, an A / D converter, etc., and uses the temporary storage function of the RAM while performing signal processing according to a program stored in the ROM in advance. Then, a drive signal for switching the ON / OFF supply / exhaust valves 46, 84, 74 and the opening / closing valve 36 and changing the operating states of the pump 34 and the motor 60 is output. In the figure, the motor 60, strain gauge 61, O
Although only one N, OFF supply / exhaust valve 74, and one air pressure sensor 76 are shown, the same processing is performed for each of the number of press machines 10, four in this embodiment. Such controller 90 also
A setting device 92 such as a keyboard or a personal computer and a transceiver 94 are connected. Machine information unique to the press machine 10 is input in advance from the setting device 92, while mold information unique to the mold to be used is received from the transceiver 94. Is entered. That is, the punch die 12 stores the die information peculiar to the die and has an ID card 96 having a transmission function and a battery.
(See FIG. 2) is attached, and by receiving the data acquisition signal transmitted from the transceiver 94, I
The mold information is transmitted from the D card 96, and the mold information is taken into the controller 90 via the transceiver 94.

The machine information and the die information are the air pressures Pa, Pb, which enable appropriate press working.
Information necessary to determine the hydraulic pressure Ps and the relative distance h,
For example: In addition, the mold information,
It also includes information such as the type of mold, that is, vehicle type, product number, press machine used, and process. (Machine information) -Weight of cushion pad 28-Weight of cushion pin 24-Wp of slide plate 20-Pressure area Aa of air cylinder 42-Pressure area of air cylinder 80 (total of four) Ab-Hydraulic cylinder Pressure receiving area As of 32. Bulk elastic coefficient K of hydraulic oil supplied to the hydraulic cylinder 32. Average thrusting dimension Xav of piston of the hydraulic cylinder 32. Oil amount V. h-Fpi temporary characteristic (Fpi = a.h) (Fri. Mold information) -Weight of wrinkle retainer ring 30-Weight of upper die (die die 18) Wu-Number of cushion pins 24 used n-Press load Fpoi-Wrinkle retainer load Fso-Number of press operations-Subtracted value α-Stop time Characteristic

Here, the weight Wa of the cushion pad 28
Is a value obtained by subtracting the sliding resistance. For example, by using the load measuring device 100 shown in FIG. 7 to measure the load by the slide plate 20 while changing the air pressure Pa, the load-air pressure It can be obtained from the characteristics. The load measuring device 100 includes a pair of load measuring bases 102 and 104.
Four columns 106 and 108 are respectively provided upright on the column 104, and strain gauges 110 and 112 are attached to the columns 106 and 108, respectively.
The load measuring table 102 is provided with a large number of through holes 114 corresponding to the through holes 26 formed in the bolster 14, and is mounted on the bolster 14 in close contact with the cushion pin 24. You can do it. In addition, the load measuring table 104 has the through holes 114 and 26.
It is adapted to be supported on a plurality of cushion pins 24 which are arranged by being inserted. Then, the strain gauge 11
0 and 112 are connected to the dynamic strain gauge 116, and the load waveform is recorded by the electromagnetic oscilloscope 118. The dynamic strain gauge 116 has an amplification function, a zero adjustment function, etc.,
The electromagnetic oscilloscope 118 records the change in load accompanying the descending and ascending of the slide plate 20 with high followability. It should be noted that the strain gauges 110 and 112 are formed by the single column 10
Four of them are attached to each of 6 and 108, and they are connected so as to form a bridge circuit.

When measuring the load of the single-action type press machine 10, when the slide plate 20 is lowered by the plunger 22 and comes into contact with the column 108 of the load measuring table 104 supported on the cushion pin 24, the load is measured. The measuring table 104 is lowered against the biasing force of the air cylinder 42, and the load at that time is 4
The strain gauges 112 provided on the columns 108 of the book respectively detect the strain. Further, when the slide plate 20 further descends and the load measuring table 104 comes into contact with the load measuring table 102, the load detected by the strain gauge 112 sharply increases corresponding to the rigidity of each part of the press machine 10. Figure 8
Is a strain gauge 11 provided on any one of the columns 108.
2 exemplifies a load change detected by 2.
The load Fsi corresponds to the wrinkle pressing load, and the load Fpi corresponds to the press load. Further, FIG. 9 is a graph in which the wrinkle pressing load Fsi is measured while changing the air pressure Pa of the air cylinder 42, and the weight Wa of the cushion pad 28 is obtained based on the load Fxi obtained from this graph. That is, the measured values Fxi at four locations (i = 1, 2, 3,
The weight Wa is obtained by subtracting the weights of the load measuring table 104 and the cushion pin 24 from the total load Fx of 4). The weight Wa can also be obtained from the graph of the total load Fs of the wrinkle pressing load Fsi and the air pressure Pa. The weight Wa is the actual weight of the cushion pad 28 minus the sliding resistance of the air cylinder 42, and the press machine 10 includes the air leak of the air cylinder 42 and the detection error of the air pressure sensor 50. It is a unique value. It should be noted that the actual weight of the cushion pad 28 and the sliding resistance can be separately used as machine information.

The weight Wp of the cushion pin 24 is an average value of a large number of cushion pins 24 used in the press machine 10, and the weight Ws of the slide plate 20 corresponds to a guide member (not shown) for guiding the slide plate 20. It is the value obtained by subtracting the sliding resistance between the two. In particular,
By operating the press machine 10 to detect the load Foi when the slide plate 20 is descending by the strain gauge 61, and changing the air pressure Pb of the air cylinder 80, the total load Fo of the four strain gauges 61.
-The air pressure Pb characteristic is calculated, and the total load Fo-Air pressure P
The weight Ws can be obtained from the characteristic b in the same manner as the cushion pad 28. The sliding resistance can be set separately as machine information. Further, the pressure receiving area Aa of the air cylinder 42 takes into consideration the air leakage of the air cylinder 42. For example, the slope of the graph of the total load Fs of the wrinkle pressing load Fsi and the air pressure Pa corresponds to the pressure receiving area Aa. When a plurality of air cylinders 42 are provided, the total area is set as the pressure receiving area Aa. The pressure receiving area Ab of the air cylinder 80 is the total of the four air cylinders 80, and is calculated from the total load Fo-air pressure Pb characteristics similarly to the pressure receiving area Aa. The pressure receiving area As of the hydraulic cylinder 32 is an average value of many hydraulic cylinders 32. For example, the wrinkle pressing load Fsi and the air pressure P in FIG.
When obtaining the characteristic with a, the hydraulic pressure Ps can be detected by the hydraulic pressure sensor 38 and can be obtained from the total wrinkle holding load Fs-hydraulic pressure Ps characteristic.

Further, the bulk elastic coefficient K is determined according to the hydraulic oil to be used, and the average drive-in dimension Xav is for uniformly contacting the plurality of cushion pins 24 with the wrinkle holding member such as the wrinkle holding ring 30. This is the downward stroke of the piston of the hydraulic cylinder 32, and the pistons of the hydraulic cylinder 32 are driven downward by all the cushion pins 24 regardless of variations in the length of the cushion pin 24 and the inclination of the cushion pad 28. In order to prevent the piston of the hydraulic cylinder 32 from reaching the stroke end irrespective of the impact acting on the cushion pin 24 when the slide plate 20 descends, experimentally beforehand, or variations in the length dimension of the cushion pin 24 and the hydraulic cylinder are performed. It is determined based on the maximum stroke of the 32 pistons and the like. The oil amount V is the total volume of hydraulic oil existing on the hydraulic cylinder 32 side of the check valve 39 (see FIG. 2) when the piston of each hydraulic cylinder 32 is positioned at the rising end.

Temporary h-Fpi characteristics (i = 1, 2, 3, 4)
Is the press load F when the plunger 22 reaches the lower end.
This is a characteristic of pi and relative distance h (Fpi = a · h), but this differs depending on the rigidity of the mold used. Therefore, the relative distance is increased by interposing a member having higher rigidity than the normal mold. h
The press load Fpi when the plunger 22 reaches the lower end is measured by the strain gauge 61 while variously changing, and reflects the rigidity of the press machine 10. This h-F
The pi temporary characteristic is measured by adjusting the air pressure Pb so that the slide plate 20 is lowered by the plunger 22 in a state where the slide plate 20 and the lifting force of the air cylinder 80 are in balance. The alternate long and short dash line in FIG. 10 illustrates an example of such a h-Fpi temporary characteristic, and is defined based on the maximum value h ₀ of the relative distance h when the press load Fpi is 0. Also, this h-
The Fpi temporary characteristic is defined for each of the four die height adjusting mechanisms 52, and the total press load Fp is the sum of the press loads Fpi. It should be noted that the load measuring apparatus 100 can be used to obtain the h-Fpi temporary characteristic from the load Fpi in FIG.

Wrinkle pressing ring 30 in the mold information
The weight Wr of the die die 18 and the weight Wu of the die die 18 are actual measurement values measured after manufacturing the wrinkle retainer ring 30 and the die die 18, and the number n of the cushion pins 24 used is the shape of the wrinkle retainer ring 30 and the like. Is determined so that a proper press-formed product can be obtained. Press load Fpoi (i =
1, 2, 3, 4) are wrinkle retainer ring 30, die type 1
8, and the punch die 12 is attached to a trial tri-press for actual press working, and the load conditions for obtaining an appropriate press-formed product are obtained by trial and error. The weight of the die and the tri-press are used. The influence due to the sliding resistance of each part is eliminated. For example, when a try press having the same structure as the press machine 10 shown in FIGS. 2 and 3 is used, the slide plate 20 and the die die 18 are used.
The air pressure Pb is adjusted so that the slide plate 20 is lowered by the plunger 22 in a state where the lifting force of the air cylinder 80 and the lifting force of the air cylinder 80 are balanced, and the load Foi detected by the strain gauge 61 when press working is performed in this state. It is determined based on. This press load Fpoi is 4
With the press load at each location, the total press load is the sum of those press loads Fpoi.

The wrinkle holding load Fso-pressing frequency characteristic is not affected by the weight of the mold, the sliding resistance of each part of the tri-press, etc., like the pressing load Fpoi.
The wrinkle holding load Fso that can obtain an appropriate press-formed product without wrinkles and cracks was obtained in relation to the number of presses. This is because when press working is continuously performed, heat is generated due to the passage resistance μ when the press material passes between the pair of molds 18 and 30, and the temperature of the wrinkle holding portion rises as the number of presses increases. Therefore, due to this temperature rise, the lubrication characteristics of the lubricating oil adhering to the press material and the friction characteristics of the mold and press material change, and the lubricating oil easily volatilizes, increasing the passage resistance μ, Considering that the tension Te rises when the press material is pulled in during drawing, the press material under the same lubrication conditions as in the case of mass production is pressed continuously to prevent temperature changes and cracks. It is required based on the situation of occurrence.
Table 1 is an example thereof, and the load number N is increased by 1 each time the number of presses exceeds a predetermined constant number Co of about 100, for example, and the wrinkle holding load Fso is determined for each load number N. . As is clear from Table 1, the wrinkle holding load Fso is reduced as the load number N is large and the number of presses is large. This wrinkle retainer load Fso
Is the total load, and is determined based on the total load Fo of each load Foi detected by the strain gauge 61.

[0034]

[Table 1]

The subtraction value α-stop time characteristic is such that the subtraction value α of the load number N is set so that the wrinkle pressing load Fso is increased according to the stop time of the press machine. This is because when the press working is continuously performed as described above, the temperature of the molds 18 and 30 rises to a temperature at which the heat generation amount Qs due to the passage resistance μ and the heat radiation amount are balanced, but the press working is performed due to a break or the like. This is because when the suspension is performed, the temperature of the mold is lowered due to heat dissipation depending on the suspension time, and the passage resistance μ is reduced due to changes in the lubrication conditions and the like. That is, when the press working is restarted with the wrinkle holding load as it is, the tension Te is reduced corresponding to the decrease of the passage resistance μ, so that the wrinkle is easily generated in the press-formed product, while the wrinkle holding load at the beginning of the press working is increased. Specifically, under the load condition when the load number N = 1 in Table 1 above, the tension Te may become too large and crack may occur. Therefore, the load number at which the appropriate press working is performed according to the stop time. The subtracted value α of N is obtained in advance by experiments or the like. FIG. 11 is an example of such a subtraction value α-stop time characteristic. Nmax at the maximum value (Nmax -1) of the subtraction value α is the maximum value of the load number N, that is, the heat generation amount Qs.
Wrinkle hold down load F when
so is the set load number. Although it depends on the material of the mold, in general, when the stop time exceeds 1 hour, the temperature of the mold decreases to about room temperature.
The subtraction value α is the largest (Nmax -1).

Returning to FIG. 4, a limit switch 124 and a start switch 126 are also connected to the controller 90. The limit switch 124 is turned on when the plunger 22 of the press machine 10 reaches the lower end.
Therefore, the press signal SP is output to the controller 90 each time the press working is performed once. The start switch 126 is turned on and off by a worker when starting and stopping press working, and outputs a start signal SS indicating the ON state to the controller 90.

The controller 90 executes the functions shown in FIG. 5 by performing signal processing according to a predetermined program stored in the ROM. In FIG. 5, the machine information memory 130 is
Machine information previously input by the setting device 92 is stored, and the mold information memory 132 has mold information attached to the press machine 10 and read from the ID card 96 by the transceiver 94. Memorize The air pressure Pax calculation block 134 is set as the mold information based on the machine information stored in the machine information memory 130 and the mold information stored in the mold information memory 132. Wrinkle pressing load Fso-The air pressure Pax for generating the wrinkle pressing load Fso (100 tf in this embodiment) of the load number N = 1 in the press number characteristic is calculated according to the following equation (6). Air pressure Pa
The adjustment block 136 controls the ON / OFF air supply / exhaust valve 46 so that the air pressure Pa in the air tank 44 detected by the air pressure sensor 50 becomes the calculated air pressure Pax. As a result, wrinkle pressing is performed with the wrinkle pressing load Fso at the load number N = 1 set as mold information. The capacity of the air tank 44 is sufficiently large, and the fluctuation of the air pressure Pa due to the volume change of the air cylinder 42 accompanying the lowering of the cushion pad 28 is almost negligible. It can also be calculated. The air pressure Pax calculation block 134
Is the wrinkle holding load F when the air pressure Pa is initially set.
It is predetermined to read the wrinkle pressing load Fso of the load number N = 1 from the so-press frequency characteristic and calculate the air pressure Pax.

[0038]

## EQU00003 ## Pax = (Fso + Wa + Wr + n.Wp) / Aa (6)

The hydraulic pressure P ₀ , P ₁ calculation block 138 calculates the hydraulic pressure P ₀ , P _{1 based on} the machine information stored in the machine information memory 130 and the mold information stored in the mold information memory 132.
An initial hydraulic pressure for causing the wrinkle holding load Fso to act on the wrinkle holding ring 30 substantially evenly via each cushion pin 24,
That is, the hydraulic pressure P ₀ in the state where the die die 18 is not in contact with the wrinkle retainer ring 30 is calculated from the relationship of the following equation (7), and each cushion pin is pressed at the time of press work in which the wrinkle retainer ring 30 is pressed by the die die 18. 24
The target hydraulic pressure P ₁ when the crease presser load Fso is evenly applied to is calculated from the relationship of the following equation (8). Then, the hydraulic pressure Ps adjusting block 140 first controls the pump 34 and the on-off valve 36 so that the initial hydraulic pressure of the hydraulic pressure Ps detected by the hydraulic pressure sensor 38 becomes the initial hydraulic pressure P ₀ . As a result, at the time of press work in which the wrinkle press ring 30 is pressed by the die die 18, basically, the piston of each hydraulic cylinder 32 is pressed by the average drive-in dimension Xav, and the wrinkle press load Fso is applied via each cushion pin 24. Although it is applied to the wrinkle holding ring 30 substantially evenly, the initial elastic pressure P ₀ is not always accurate because the bulk elastic coefficient K is not necessarily constant due to the inclusion of air. For this reason, the hydraulic pressure Ps adjustment block 140 determines that the hydraulic pressure Ps
After adjusting s to the initial hydraulic pressure P ₀ , the hydraulic pressure Ps at the time of press working is actually read when the test press is actually performed, and the initial hydraulic pressure P is adjusted so that the hydraulic pressure Ps substantially matches the target hydraulic pressure P _1.
Correct ₀ . That is, when the hydraulic pressure Ps during the press working is higher than the target hydraulic pressure P ₁ , the wrinkle pressing ring 30 is not in contact with a part of the cushion pins 24, and the wrinkle pressing load Fso acts unevenly on the remaining cushion pins 24. for the case it is, cushion pins 2 by lowering the initial pressure P ₀
The drive-in amount of 4 may be increased as a whole. Further, when the hydraulic pressure Ps during the press working is lower than the target hydraulic pressure P ₁ , the pistons of some of the hydraulic cylinders 32 reach the stroke ends and part of the wrinkle pressing load Fso acts directly on the cushion pad 28. Therefore, the initial hydraulic pressure P ₀ may be raised so as not to reach the stroke end.

[0040]

[Formula 4] Xav = (Fso−n · As · P ₀ ) V / n ² · As ² · K (7) Fso + Wr + n · Wp = n · As · P ₁ (8)

The air pressure Pbx calculation block 142 calculates the air pressure Pbx for lifting the slide plate 20 and the die mold 18 with the force balanced with the slide plate 20 and the die mold 18 according to the following equation (9) based on the machine information and the mold information. The air pressure Pb adjusting block 144 is turned on and off so that the air pressure Pb in the air tank 82 detected by the air pressure sensor 86 becomes the calculated air pressure Pbx.
Switch control. As a result, the press work can be performed with each press load Fpoi set as the mold information without being affected by the weights of the slide plate 20 and the die mold 18. The capacity of the air tank 82 is sufficiently large, and the fluctuation of the air pressure Pb due to the volume change of the four air cylinders 80 accompanying the lowering of the slide plate 20 is almost negligible. The pressure Pbx can also be calculated.

[0042]

(5) Pbx = (Wu + Ws) / Ab (9)

The relative distance h adjustment block 146 controls the die height adjusting mechanism 52 at four locations so that the press work is performed with each press load Fpoi set as the mold information based on the machine information and the mold information. The relative distance h is adjusted independently. First, based on the load Foi supplied from the strain gauge 61, the reference value h ₀ which is the maximum value of the relative distance h when the press load Fpi is ₀ is determined. The relative distance h _{1 at} which the press load Fpoi can be obtained from the h-Fpi temporary characteristic (Fpi = a · h) indicated by the one-dot chain line in FIG. 10 set as the machine information. Next, the relative distance h is adjusted to h ₁ by the servo motor 60 with the reference value h ₀ as a reference, and the press load Fp ₁ based on the signal supplied from the strain gauge 61 when the test press is performed in that state. To measure. Preset h-
Since the Fpi temporary characteristic is set on the basis of the case where the rigidity is higher than that of a normal die, the press load Fp ₁ is generally smaller than the press load Fpoi. Then, the relative distance h
Relative distance h smaller than ₁ by a predetermined change amount Δh
Change the relative distance h to ₂ and press load Fp _{2 in the same way.}
To measure. Then, based on these relative distances h ₁ and h ₂ and the press loads Fp ₁ and Fp ₂ , the h-Fpi main characteristics (Fpi = b · h) shown by the solid line in FIG. h-Fpi Press load Fpoi from this characteristic
Is determined, and the servomotor 60 controls the relative distance h to be hx. The determination and adjustment of the relative distance hx are independently performed for the four die height adjusting mechanisms 52 in the same manner as described above. As a result, the press load Fpo set as the mold information is maintained regardless of the difference in the rigidity of each press machine 10.
Good press work with i.

In addition to the above controls, the controller 90 also determines the load Foi at four locations detected by the strain gauge 61, which is a predetermined overload prevention load Foli (i = 1, 2, 3, 4). ),
The air pressure Pc is controlled. That is, when the overload prevention load Foli acts on the hydraulic cylinder 62 for preventing overload due to the presence of foreign matter, the cylinder 6
The piston 6 moves backward to the air chamber 70 side and the hydraulic cylinder 6
2 to allow the hydraulic oil to flow into the oil chamber 68 so that the slide plate 20 and the plunger 22 can approach each other, and the pressure receiving area of the hydraulic cylinder 62 and the pressure receiving of the oil chamber 68 and the air chamber 70 of the cylinder 66. Air pressure P based on area
cx is set, and the air pressure Pc is the air pressure Pcx.
Thus, the ON / OFF supply / exhaust valve 74 is controlled to be switched. The pressure control of the air pressure Pc is independently performed for each of the four cylinders 66. This prevents damage to the press machine 10, the mold, and the like due to an excessive press load. Since the air pressure Pc can be set independently of the mold used, it may be adjusted in advance by manual operation or the like.

As described above, in the press machine 10 of this embodiment, the machine information unique to the press machine 10 and the transceiver 9 stored in the machine information memory 130 in advance.
Based on the die information peculiar to the die read from the ID card 96 via 4, the appropriate press working required by the tri-press regardless of the difference in the rigidity of each press machine or the sliding resistance of each part. In order to reproduce the press conditions under which the pressure is applied, that is, the wrinkle pressing load Fso and the press load Fpoi, the press working conditions such as the air pressures Pax, Pbx, the initial hydraulic pressure P ₀ , and the relative distance hx are obtained. Since the air pressures Pa, Pb, the hydraulic pressure Ps, and the relative distance h are automatically initialized according to the values, troublesome setting work due to trial and error is eliminated, and the burden on the operator is significantly reduced. A press-formed product of excellent quality can be stably obtained.

The air pressures Pa, Pb, the hydraulic pressure Ps,
And the relative distance h are not always exactly the air pressures Pax, Pb.
x, the corrected initial hydraulic pressure P ₀ , and the relative distance hx do not have to be controlled so as to match, and the control may be performed so as to fall within a predetermined permissible range predetermined to satisfy the required press quality. .

On the other hand, the air pressures Pa, Pb, the hydraulic pressure P
After the s and the relative distance h are automatically initialized based on the mold information and the machine information, when the press machine 10 actually produces a large amount of press-formed products, The above air pressure Pa depending on the stop time
Is changed. That is, the controller 90 includes a load number N changing block 148, and calculates the number of presses and the stop time based on the press signal SP supplied from the limit switch 124 and the start signal SS supplied from the start switch 126, The wrinkle pressing load Fso when the air pressure Pax is calculated in the pressure Pax calculation block 134 is changed.

FIG. 6 is a flow chart for explaining a specific function of the load number N changing block 148, which is repeatedly executed at a predetermined cycle time. Step S1
Then, it is determined whether or not the activation signal SS is ON. If not, the flag F is set to "0" in step S2.
The start signal SS is turned on and the determination in step S1 is YES.
When S is reached, it is determined in step S3 whether or not the flag F = 1. However, since F = 0 at the beginning of press working, step S4 is subsequently executed. This step S4
Then, the load number N is newly set based on the content of the timer TI, and the load number N is output to the air pressure Pax calculation block 134. Since the timer TI is sequentially reset in step S6 while the press machine 10 is in operation, the timer T during execution of step S4.
The contents of I are changed by the start switch 126 by the press machine 10.
Corresponding to the stop time until the re-operation after stopping, the subtraction value α is calculated from the content of the timer TI based on the subtraction value α-stop time characteristic of FIG. 11, and the current load number N A new load number N is calculated by subtracting the subtraction value α. Further, in the air pressure Pax calculation block 134 to which the new load number N is supplied, the wrinkle holding load Fso related to the supplied load number N is read from the wrinkle holding load Fso-pressing number characteristic of Table 1 and the wrinkling is performed. While the air pressure Pax is recalculated using the pressing load Fso according to the equation (6), the air pressure Pa adjusting block 136 adjusts the air pressure Pa so as to become the newly calculated air pressure Pax. That is, the wrinkle holding load Fs, in other words, the air pressure Pa is changed so that the appropriate press working is performed according to the stop time of the press machine 10, and this is caused by the temperature drop of the mold due to the heat dissipation during the stop. Even if the lubrication conditions change and the passage resistance μ decreases, an appropriate press-formed product without wrinkles or cracks can be manufactured from the beginning of the pressing process.

Since the load number N is "1", the new load number N is set to "1" when the subtraction value α is equal to or larger than the current load number N. . Further, FIG. 11 shows the subtracted value α-stop time characteristic when the current load number N is Nmax, that is, the highest temperature in a substantially steady state, but the temperature drop characteristic differs depending on the mold temperature when the operation is stopped. Therefore, the subtracted value α-stop time characteristic can be set for each current load number N.

In the subsequent step S5, the flag F is set to "1", and in the subsequent cycle, step S6 is executed after step S3. In step S6, the timer TI
To reset the press signal S in the next step S7.
It is determined whether P is ON. When the press signal SP is turned ON, in other words, every time the press working is performed once, step S8 is executed and 1 is added to the content C of the counter.
In step S9, it is determined whether or not the content C of the counter has reached the predetermined number Co, and when it reaches Co, step S10 is executed. In step S10, load number N
Is the maximum value Nmax, and if the load number N is the maximum value Nmax, the content C of the counter is cleared in step S12, and the execution of step S1 and subsequent steps is repeated, but if it is not the maximum value Nmax, Step S11 is executed and 1 is added to the current load number N to set a new load number N. By outputting the new load number N to the air pressure Pax calculating block 134, the air pressure Pax calculating block 134 reads the new wrinkle pressing load Fso from the wrinkle pressing load Fso-press frequency characteristic of Table 1. The air pressure Pax is calculated according to the equation (6) according to the wrinkle pressing load Fso, and the air pressure Pa adjusting block 136 changes the air pressure Pa so as to be the air pressure Pax. As a result, the temperature of the mold rises as the number of presses increases, and even if the passage resistance μ increases due to a change in lubrication characteristics, a proper press-molded product without cracks can be manufactured. The constant number Co and the maximum value Nmax are set in accordance with the wrinkle holding load Fso-pressing number characteristic in Table 1.

As described above, the press machine 10 of this embodiment is
According to the number of presses, the wrinkle holding load Fso in Table 1-the wrinkle holding load Fs is reduced according to the press number characteristic, the air pressure Pa is correspondingly reduced, and the subtraction value α- of FIG. The wrinkle pressing load Fs is increased according to the stop time characteristic, and the air pressure P is correspondingly increased.
Since a is increased, an appropriate press-molded product without wrinkles or cracks can always be manufactured irrespective of the fluctuation of the passage resistance μ due to the temperature change of the mold. Further, since the wrinkle pressing load Fs, that is, the air pressure Pa is reduced according to the number of times of pressing, early wear of the mold due to the excessive tension Te is prevented, and the heat generation amount Qs is reduced to reduce the heat radiation amount. Since the mold temperature to be balanced becomes low, the influence of heat is reduced in the entire press working.

This embodiment is one embodiment of the first invention and the second invention, and is a load number N changing block 148.
The air pressure Pax calculation block 134 corresponds to the wrinkle pressing load control means, and the air pressure Pa adjusting block 136, the ON / OFF supply / exhaust valve 46, and the air pressure sensor 50 correspond to the wrinkle pressing load adjusting means. Also, load number N
The part of the change block 148 that executes steps S7 and S8 and the limit switch 124 constitute pressing number detecting means, and the timer TI that is reset in step S6 and the execution of step S6 while the press machine 10 is stopped. Steps S1 and S2
Corresponds to the timekeeping means.

Next, another embodiment will be described. In the following embodiments, the same parts as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 12 shows a radiation thermometer 350, which measures the temperature in a non-contact manner based on the radiant energy of thermal radiation, provided in the machine frame 78 of the press machine 10 via a mount 352 as a temperature detecting means. The temperature θ of the press-formed product 354 drawn by the press machine 10 is measured. The radiation thermometer 350 is configured such that an operator can visually check the temperature measuring section by irradiating the temperature measuring section with visible light, and the mount 352 freely changes the direction of the radiation thermometer 350. In order to measure the temperature θ of the wrinkled part of the press-formed product 354, that is, the part where the plate thickness increases due to the drawing process and the temperature is most likely to rise due to the passage resistance μ, press-molding can be performed. The direction of the radiation thermometer 350 is determined in advance according to the shape of the item 354.
Depending on the shape of the press-molded product 354, the radiation thermometer 350 may be arranged at a plurality of positions to form the press-molded product 354.
It is also possible to improve the detection accuracy by measuring the temperature θ of a plurality of parts.

Further, in this embodiment, "wrinkle pressing load Fso-temperature θ characteristic" is stored in the ID card 96 as the mold information. This wrinkle holding load Fso-temperature θ characteristic is obtained by continuously performing press working without being affected by the weight of the mold, sliding resistance of each part of the tri-press, etc. And the wrinkle holding load Fso that can obtain an appropriate press-formed product without wrinkles or cracks.
And the temperature θ. This is because when press working is continuously performed, the press material is a pair of dies 1.
Heat is generated due to the passage resistance μ when passing between 8 and 30, and the temperature of the wrinkle holding portion rises as the number of presses increases. Therefore, due to this temperature rise, the lubricating oil adhering to the press material Taking into consideration that the lubrication oil easily volatilizes as the lubrication characteristics and the friction characteristics of the die and press material change, the passage resistance μ increases, and the tension Te when the press material is pulled in during drawing increases. The wrinkle holding load Fso-temperature θ characteristic is required under the same lubrication conditions as in mass production. FIG. 13 is an example of such a wrinkle holding load Fso-temperature θ characteristic, and the higher the temperature θ, the smaller the wrinkling holding load Fso. In this embodiment, the "wrinkle holding load Fso-pressing number characteristic" and "subtraction value α-stopping time characteristic" are unnecessary.

On the other hand, the controller 90 of the press machine 10
Is the load number N, as shown in FIG.
A wrinkle holding load Fso setting block 356 is provided instead of the change block 148. The wrinkle presser load Fso setting block 356 is supplied with information regarding the temperature θ from the radiation thermometer 350 and the mold information memory 132 with information regarding the wrinkle presser load Fso-temperature θ characteristic of FIG. 13. And the wrinkle holding load Fso−
The wrinkle pressing load Fso is set from the temperature θ characteristic and the actual temperature θ, and the wrinkle pressing load Fso is sequentially updated as the temperature θ changes. The set wrinkle presser load Fso is
The air pressure Pax calculation block 358 is a wrinkle pressing load that allows proper press working without cracks or wrinkles under the condition of the temperature θ at that time. ), The air pressure Pax is calculated, and the information regarding the air pressure Pax is output to the air pressure Pa adjustment block 136.

Therefore, when the temperature θ is high and the passage resistance μ is large, the wrinkle pressing load Fso is reduced and the air pressure Pa is correspondingly reduced, while when the temperature θ is low and the passage resistance μ is small, the wrinkle pressing load is reduced. The load Fso is increased and the air pressure Pa is correspondingly increased. For this reason, an appropriate tension Te can always be obtained irrespective of the fluctuation of the passage resistance μ caused by the change of the temperature θ, the occurrence of wrinkles and cracks is prevented, and the excessive tension T
The early wear of the mold due to e is suppressed. Further, as the wrinkle pressing load Fs is reduced in accordance with the rise of the temperature θ, the heat generation amount Qs is reduced, so that the temperature θ at the time of balancing with the heat radiation amount is lowered, and the influence of heat is reduced in the overall press working. .

This embodiment is an embodiment of the third aspect of the invention, in which the wrinkle holding load Fso setting block 356 and the air pressure Pax calculating block 358 correspond to wrinkle holding load control means, and the air pressure Pa adjusting block 136 and ON, OF
The F air supply / exhaust valve 46 and the air pressure sensor 50 correspond to the wrinkle pressing load adjusting means.

FIG. 15 shows an example in which the present invention is applied to a double action type press machine 150 for drawing. The die type 152 is fixedly used on the bolster 154 while the wrinkle holding ring is used. 156 is fixed to the outer slide 160 via the blank holder plate 158, and the punch mold 162 is fixed to the inner slide 164 for use. The outer slide 160 can be vertically moved via four outer plungers 166, and the inner slide 164 can be vertically moved via four inner plungers 168, as shown in FIG. Wrinkle retainer ring 1 as shown
While pressing the peripheral edge portion of the press material 171 between 56 and the wrinkle holding portion 170 of the die die 152, drawing is performed by the punch die 162 and the die die 152. The die mold 152, the wrinkle holding ring 156 and the punch mold 162 correspond to a pair of molds detachably attached to the press machine 150 for use.

As is apparent from FIG. 16, the outer plunger 166 is the die height adjusting mechanism 5 of the above embodiment.
It is connected to the outer slide 160 via a die height adjusting mechanism 172 similar to that of No. 2, and the relative distance ha is adjusted by the servo motor 174. The relative distance ha is detected by the rotary encoder 176 (see FIG. 18) provided in the servo motor 174. As the relative distance ha increases, the outer slide 160 is lowered relative to the outer plunger 166, and the wrinkle holding load Fs when the outer plunger 166 reaches the lower end is changed. It is adjusted according to the load Fs. The four outer plungers 166 are connected to the outer slide 160 via the die height adjusting mechanism 172, and the relative distance ha is adjusted. A strain gauge 178 is attached to each outer plunger 166 so as to detect each load Fai (i = 1, 2, 3, 4) acting on each outer plunger 166.

The die height adjusting mechanism 172 is integrally connected to the piston 182 of the hydraulic cylinder 180 provided for adjusting the wrinkle pressing load, while the housing of the hydraulic cylinder 180 is integrally provided on the outer slide 160. Has been done. The pressure chamber of the hydraulic cylinder 180 is filled with hydraulic oil, and the pressure chamber is communicated with the oil chamber 186 of the cylinder 184. Cylinder 1
The air chamber 188 of 84 is connected to the air tank 190, and the air tank 190 is connected to the machine frame 196 of the press machine 150 via a pair of pipes 192 and 194.
Is connected to the connecting tools 198 and 200 disposed in the.
These connectors 198 and 200 include the connectors 20 of the control box 202 shown in FIG. 18, respectively.
Pressure-resistant connection hose 20 with one end connected to 4a, 206a
The other end of 8a, 210a is connected, the air pressure Pe in the air tank 190 is detected by the air pressure sensor 212a arranged in the control box 202, and the air is supplied by the electromagnetic ON / OFF supply / exhaust valve 214a. The pressure Pe is regulated. The hydraulic cylinder 18
0, the cylinder 184, the air tank 190, etc. are respectively arranged at the connecting portions of the four outer plungers 166 and the outer slide 160, and one of them is described above, but the other three air tanks are provided. Also for 190, each of them is connected to a connector provided in the machine frame 196 through a pair of pipes, respectively, and a connector 204b of the control box 202 is connected through pressure resistant connection hoses 208b to 208d and 210b to 210d. ~ 204
d, 206b to 206d, the air pressure sensor 21
2b to 212d, the air pressure P in the air tank 190
e is detected respectively, and electromagnetic ON / OF
The air pressure Pe is adjusted by the F air supply / exhaust valves 214b to 214d. The air pressure Pe is adjusted according to the wrinkle pressing load Fs. The connecting tools 198, 200, 204a to 204d, 20
6a to 206d and pressure resistant connection hoses 208a to 208
Each of d and 210a to 210d is color-coded so that predetermined connecting members are connected to each other.

The outer slide 160 is connected to the four outer balancer air cylinders 216 arranged in the machine frame 196 of the press machine 150. The pressure chamber of the air cylinder 216 is communicated with the air tank 218, and the air tank 218 is connected to the pair of pipes 2
Connecting tool 2 arranged on the machine frame 196 via 20, 222
24 and 226. These connecting tools 22
4, 226 are provided with the control box 2
02 is connected to the other end of the pressure resistant connection hoses 232 and 234, one end of which is connected to the connection tools 228 and 230 of No. 02, and the air pressure Pd in the air tank 218 is detected by the air pressure sensor 236 arranged in the control box 202. At the same time, the air pressure Pd is regulated by the electromagnetic ON / OFF supply / exhaust valve 238. This air pressure Pd is
Blank holder plate 158, outer slide 160
The pressure is adjusted so as to balance with the weight of the wrinkle holding ring 156. The pressure chambers of the four air cylinders 216 are connected to a common air tank 218.

On the other hand, the inner plunger 168 has the die height adjusting mechanism 1 as shown in FIG.
A servo motor 242 is connected to the inner slide 164 via a die height adjusting mechanism 240 similar to that of 72.
The relative distance hb is adjusted by.
The relative distance hb is detected by the rotary encoder 244 (see FIG. 18) provided in the servo motor 242. As the relative distance hb increases, the inner slide 164 is lowered with respect to the inner plunger 168, and the press load Fp when the inner plunger 168 reaches the lower end is changed. Will be adjusted accordingly. It should be noted that the four inner plungers 168 are respectively the die height adjusting mechanism 2 described above.
Is connected to the inner slide 164 via 40,
The relative distance hb is adjusted respectively. A strain gauge 246 is attached to each inner plunger 168 so as to detect each load Fbi (i = 1, 2, 3, 4) acting on each inner plunger 168.

The die height adjusting mechanism 240 is integrally connected to the piston 250 of the hydraulic cylinder 248 provided to prevent overload, while the housing of the hydraulic cylinder 248 is integrally provided on the inner slide 164. ing. The pressure chamber of the hydraulic cylinder 248 is filled with hydraulic oil, and the pressure chamber is communicated with the oil chamber 254 of the cylinder 252. Cylinder 2
The air chamber 256 of 52 is communicated with an air tank 258, and the air tank 258 is an electromagnetic type O
The air pressure Pg in the air chamber 256 and the air tank 258 is connected to the pressure air source 262 in the factory through the N, OFF supply / exhaust valve 260, and the ON / OFF supply / exhaust valve 260 is switched and controlled. It is supposed to be adjusted. The air pressure Pg is detected by the air pressure sensor 264. The air pressure Pg allows the piston to retreat to the air chamber 256 side and the die height adjusting mechanism 240 and the inner slide 164 to approach each other when an excessive load is applied to the hydraulic cylinder 248. Press machine 1 to prevent damage to dies etc.
The pressure is adjusted according to the pressing capacity of 50. The hydraulic cylinder 248, the cylinder 252, the air tank 258, etc. are provided with four inner plungers 168 and an inner slide 1.
The air pressure Pg is adjusted at each of the connecting portions with 64.

The inner slides 164 are connected to four inner balancer air cylinders 266 arranged in the machine frame 196 of the press machine 150. The pressure chamber of the air cylinder 266 is communicated with the air tank 268, and the air tank 268 is an electromagnetic type ON,
The pressure air source 26 is supplied via the OFF air supply / exhaust valve 270.
2 is connected to the ON / OFF supply / exhaust valve 270.
Is controlled to be switched so that the pressure chamber and the air tank 2 are
The air pressure Pf in 68 is adjusted. The air pressure Pf is detected by the air pressure sensor 272, and the inner slide 164 and the punch die 162 are also used.
The pressure is adjusted to balance the weight of. The pressure chambers of the four air cylinders 266 are connected to a common air tank 268.

The control box 202 is shown in FIG.
1 and FIG. 22, four wheels 28
The plurality of press machines 1 are provided with a carriage 284 which has a handle 282 and which can move freely by gripping the handle 282.
50 is selectively used as needed. The control box 202 includes the connecting members 204a to
204d, 206a to 206d, 228, 230,
The ON / OFF supply / exhaust valves 214a to 214d, 2
The connecting member 286 is connected to the pressure air source 262 via a pressure-resistant connecting hose 288 (see FIG. 18). Further, the air pressure sensors 212a to 212d, 23
Five display meters 290 for analog display of the air pressures Pe and Pd detected by 6 and four wrinkle pressing loads Fsi calculated from the air pressures Pe and Pd.
Display panel 29 that digitally displays balancer load etc.
2 and the like, and an adjustment switch 293 for manually adjusting the wrinkle pressing load Fsi and the balancer load are also provided. The pressure resistant connection hose 288
Or the pressure resistant connection hoses 208a to 208d, 210a to
210d, 232, 234 can be stored in a storage box 294.

The control box 202 is also shown in FIG.
8, the controller 296 is provided, and the signals representing the air pressures Pe and Pd output from the air pressure sensors 212a to 212d and 236 are supplied to the controller 296, respectively. Controller 296
Is composed of a microcomputer having a CPU, a RAM, a ROM, an input / output interface circuit, etc., performs signal processing according to a program previously stored in the ROM while utilizing the temporary storage function of the RAM, and
The N, OFF supply / exhaust valves 214a to 214d, 238 are switch-controlled. This controller 296 is a plug 298
Is connected to the outlet in the factory by the press machine 15 through the connector 300.
It is connected to a dedicated controller 302 dedicated to 0, and exchanges necessary information with the dedicated controller 302.

The dedicated controller 302 includes a CPU,
It consists of a personal computer with RAM, ROM, input / output interface circuit, A / D converter, etc.
Signal processing is performed according to a program stored in advance in the ROM while using the temporary storage function of the RAM. The air pressure sensors 264, 272, rotary encoders 176, 24
4, the air pressure P output from the strain gauges 178 and 246
Signals indicating g, Pf, relative distances ha, hb, loads Fai, Fbi are respectively supplied to the dedicated controller 302, and the ON / OFF supply / exhaust valve 260,
The operating states of 270 and the motors 174 and 242 are controlled by the dedicated controller 302. In FIG. 18, motors 174, 242, strain gauges 178, 246, ON, OF
Although only one F supply / exhaust valve 260 and one air pressure sensor 264 are shown, the press machine 150
The same processing is performed for each of the numbers provided in the above, that is, four in this embodiment.

In the dedicated controller 302, machine information unique to the press machine 150 is stored in advance by key input or the like, and mold information unique to the mold to be used is inputted from the transceiver 304. . That is, the die mold 152 stores the mold information peculiar to the mold and has an ID having a transmission function and a battery.
The card 306 (see FIG. 15) is attached, and by receiving the data capture signal transmitted from the transceiver 304, the mold information is transmitted from the ID card 306, and the mold information is transmitted to the transceiver 304. It is taken in by the dedicated controller 302 via this.

The machine information and the die information are the air pressures Pd, Pe, which enable appropriate press working.
The information necessary to determine Pf and the relative distances ha and hb is, for example, as follows. It should be noted that the mold information includes the type of mold, that is, the model and part number, the press machine used,
It also includes information such as the process. (Machine information) -Push-in dimension Y of the cylinder 188-Pressure receiving area Ax of the hydraulic cylinder 180-Pressure receiving area Ay of the oil chamber 186 of the cylinder 184-Pressure receiving area Az of the air chamber 188 of the cylinder 184-Volume Ve of the air tank 190 Weight of outer slide 160 including blank holder plate 158 Wos-Weight of inner slide 164 Wis-Pressure receiving area of air cylinder 216 (total of four) Ad-Pressure receiving area of air cylinder 266 (total of four) Af-ha- Fsi temporary characteristics (Fsi = c · ha + d) ・ hb-Fpi temporary characteristics (Fpi = e · hb) (mold information) ・ Wrinkle holding ring 156 weight Wr ・ Punch die 162 weight Wq ・ Press load Fpoi ・ Wrinkle pressing Load Fsoi-Press count characteristics-Subtracted value α-Stop time characteristics

Here, the drive-in dimension Y and the pressure receiving area A
The x, Ay, Az, and the capacitance Ve are independently determined for the four connecting portions that connect the outer slide 160 to the four outer plungers 166. Drive-in dimension Y
Is a moving stroke of the piston of the cylinder 184 to the air chamber 188 side, and is previously obtained by experiments or the like so that the piston is driven in and the wrinkle holding based on the air pressure Pe is surely performed. Pressure receiving area Ax, A
For y and Az, a substantial pressure receiving area including sliding resistance and air leakage is determined based on the operating characteristics of the hydraulic cylinder 180 and the cylinder 184, and the volume Ve includes the volume of the air chamber 188 and is the piston's It is obtained from the change of the air pressure Pe with respect to the moving stroke.

The weight Wos of the outer slide 160 including the blank holder plate 158 is a value obtained by subtracting the sliding resistance. For example, the strain gauge 178 detects the load Fai when the outer slide 160 descends by operating the press machine 150. And the air cylinder 2
By changing the air pressure Pd of 16, the total load Fa-air pressure Pd characteristic of the four strain gauges 178 is obtained, and the weight Ws of the slide plate 20 in the above embodiment is calculated from the total load Fa-air pressure Pd characteristic. It is obtained in the same way as when it is obtained. The sliding resistance can be set separately as machine information. Inner slide 164 weight W
Similarly, is is also obtained from the total load Fb-air pressure Pf characteristic. Further, the pressure receiving area Ad of the air cylinder 216
Is a total of four air cylinders 216, and the air leakage of each air cylinder 216 is taken into consideration. The gradient of the total load Fa-air pressure Pd characteristic is the pressure receiving area Ad.
Equivalent to. The pressure receiving area Af of the air cylinder 266 is also the total of the four air cylinders 266, and the individual air cylinders 2
In consideration of the air leakage of 66, the total load F
The slope of the b-air pressure Pf characteristic corresponds to the pressure receiving area Af.

Ha-Fsi temporary characteristic (i = 1, 2, 3, 4)
Is the characteristic (Fsi = c · ha) of the wrinkle holding load Fsi and the relative distance ha when the outer plunger 166 reaches the lower end.
+ D), which varies depending on the rigidity of the mold used, so a member having higher rigidity than the normal mold is interposed and the relative distance ha is variously changed while the strain gauge 178 is used.
Is a measurement of the wrinkle pressing load Fsi when the outer plunger 166 reaches the lower end.
It reflects a stiffness of 0. When measuring the ha-Fsi temporary characteristics, the air pressure P is set so that the outer slide 160 is lowered by the outer plunger 166 in a state where the outer slide 160 and the blank holder plate 158 and the lifting force of the air cylinder 216 are in balance.
Since the wrinkle pressing load Fsi is changed by the air pressure Pe while adjusting d, the air pressure Pe is set as a parameter as shown in FIG. In addition, the ha-Fsi provisional characteristic is set with reference to the maximum value ha ₀ of the relative distance ha when the wrinkle pressing load Fsi is 0, and is set for each of the four die height adjusting mechanisms 172, and the entire wrinkle pressing force is set. The load Fs is the total of each wrinkle pressing load Fsi. Note that it is also possible to measure this ha-Fsi temporary characteristic using the load measuring device 100. For example, as shown in FIG. 25, the spacer block 120 is placed on the column 106 of the load measuring stand 102, and the strain gauge is used. Each wrinkle holding load Fsi is measured by 110.

Hb-Fpi temporary characteristic (i = 1, 2, 3, 4)
Is the characteristic of the press load Fpi and the relative distance hb when the inner plunger 168 reaches the lower end (Fpi = e · hb).
Then, the h-Fpi temporary characteristic (Fpi = a ·
It is set in the same manner as in h). Specifically, a member having higher rigidity than that of a normal die is interposed, and the inner distance of the inner plunger 168 is increased by the strain gauge 246 while changing the relative distance hb.
Is to measure the press load Fpi when reaches the descending end, and reflects the rigidity of the press machine 150. This hb
-In measuring the Fpi temporary characteristic, the inner slide 164 is also used.
The air pressure Pf is adjusted so that the inner slide 164 is lowered by the inner plunger 168 in a state in which the lifting force of the air cylinder 268 and the lifting force of the air cylinder 268 are balanced. In addition, the hb-Fpi temporary characteristics are determined for each of the four die height adjusting mechanisms 240, and the total press load Fp is the sum of the individual press loads Fpi. Note that, as shown in FIG. 25, the load measuring device 1
00, the press load Fpi can also be measured from the output of each strain gauge 112.

Wrinkle pressing ring 15 in the mold information
The weight Wr of No. 6 and the weight Wq of the punch die 162 are measured values measured after the wrinkle holding ring 156 and punch die 162 are manufactured. Press load Fpoi (i = 1,
2, 3, 4) are punch type 162 and die type 152.
Is mounted on a trial tri-press for actual press working, and the load conditions for obtaining an appropriate press-formed product are obtained by trial and error. The influence is eliminated. For example, when a tri-press configured similarly to the press machine 150 of FIG. 15 is used, the inner slide 16
4 and the punch die 162 are balanced with the lifting force of the air cylinder 266, the inner slide 16
4 is lowered by the inner plunger 168, and the press load Fpoi is obtained based on the load Fbi detected by each strain gauge 246 when press working is performed in that state. The press load Fpoi is the load at each of the four points connected to the plunger 168, and the total press load Fpo is the sum of the press loads Fpoi at the four points.

Wrinkle pressing load Fsoi-pressing frequency characteristic (i
= 1,2,3,4) is an appropriate press molding without wrinkles or cracks so that it is not affected by the weight of the mold or the sliding resistance of each part of the tri-press like the press load Fpoi. The wrinkle holding load Fsoi for obtaining the product is obtained in relation to the number of presses. This is the first
As in the example, it was considered that the mold temperature rises due to the heat generated by the passage resistance μ in the wrinkle pressing portion, the lubrication conditions change, and the passage resistance μ increases to increase the tension Te. It is obtained on the basis of the temperature change, the occurrence of cracks, etc. by continuously performing press working on a press material under the same lubrication conditions as in the case of mass production. Table 2 is an example thereof, and the wrinkle holding load Fsoi is set for each load number N corresponding to the number of presses as in the case of Table 1, but in this embodiment, the die height adjusting mechanism 1 is used.
Each of the strain gauges 178 is provided with respect to the four wrinkle pressing load adjusting portions provided with 72, the cylinder 184 and the like.
The wrinkle holding load Fsoi is separately set on the basis of the measured load Fai.

[0077]

[Table 2]

Further, the subtracted value α-stop time characteristic shows that even if the passing resistance μ becomes small and the passing resistance μ becomes small due to the change of the die temperature accompanying the stop of the press machine, the proper press working is performed. As is performed, the subtraction value α of the load number N is set so as to increase each wrinkle pressing load Fsoi according to the stop time of the press machine. The subtracted value α-stop time characteristic is also experimentally obtained in advance as in the first embodiment and set in the same manner as in FIG. 11. Note that different subtraction value α-stop time characteristics can be set for each of the four wrinkle presser load adjusting sections.

Returning to FIG. 18, the dedicated controller 302
In addition, limit switch 276, start switch 27
8 is connected. The limit switch 276 is turned on when the outer plunger 166 of the press machine 150 reaches the lower end, and outputs a press signal SP to the dedicated controller 302 each time press working is performed. The start switch 278 is turned on and off by an operator when starting and stopping press working, and outputs a start signal SS indicating the ON state to the dedicated controller 302.

The controller 296 executes the functions shown in FIG. 19 by performing signal processing according to a predetermined program in the ROM. In FIG. 19, the machine information memory 310
Is to read and store machine information previously stored in the dedicated controller 302. The mold information memory 312 is read from the ID card 306 by the transceiver 304 when the mold is attached to the press machine 150. Memorize mold information. In addition, the air pressure Pdx calculation block 314, based on the machine information stored in the machine information memory 310 and the mold information stored in the mold information memory 312, the outer slide 160, the blank holder plate 158, and the wrinkle retainer. The air pressure Pdx that lifts the rings 156 with a force balanced with the rings 156 is calculated by the following equation (1)
Calculate according to 0). Air pressure Pd adjustment block 316
Controls the ON / OFF air supply / exhaust valve 238 so that the air pressure Pd in the air tank 218 detected by the air pressure sensor 236 becomes the calculated air pressure Pdx.
As a result, the press work can be performed with each wrinkle holding load Fsoi set as the mold information without being affected by the weight of the outer slide 160, the blank holder plate 158, and the wrinkle holding ring 156. The capacity of the air tank 218 is sufficiently large, and the fluctuation of the air pressure Pd due to the volume change of the four air cylinders 216 accompanying the lowering of the outer slide 160 is almost negligible. The pressure Pdx can also be calculated.

[0081]

[Equation 6] Pdx = (Wr + Wos) / Ad (10)

The air pressure Pex calculation block 318a calculates the air pressure Pex from the relationship of the following equation (11) based on the machine information and die information. The wrinkle presser load Fsoi used in the equation (11) is calculated from the wrinkle presser load Fsoi of Table 2 set as mold information-the four wrinkle presser loads Fsoi of the load number N = 1 in the number-of-press characteristics of The one corresponding to the pressure Pex calculation block 318a is read. Wrinkle presser load Fsoi-The four wrinkle presser loads Fsoi set in the press number characteristic correspond to the four air pressure Pex calculation blocks 318a to 318d, in other words, correspond to the four wrinkle presser load adjusting portions. It is set. Air pressure Pe adjustment block 320a
Controls the ON / OFF supply / exhaust valve 214a so that the air pressure Pe in the air tank 190 detected by the air pressure sensor 212a becomes the calculated air pressure Pex. The air pressure Pex is the same as the air tank 190 at the other three locations.
Is calculated based on the machine information and the mold information, respectively, and the ON / OFF supply / exhaust valves 214b-21f are fetched while taking in the signals of the air pressure sensors 212b-212d.
By controlling the switching of 4d, the air pressure Pe at each of the four locations is adjusted. The controller 296 includes air pressure Pex calculation blocks 318b to 318d and air pressure adjustment blocks 320b to 320d for that purpose. By controlling the air pressures Pe in the four air tanks 190 in this manner, the wrinkle pressing load Fsoi shown in Table 2 can be applied to each of the wrinkle pressing load adjusting portions. become. The air pressure Pex calculation blocks 318a to 318d are connected to the air pressure Pe.
In the initial setting of, the wrinkle pressing load Fsoi-the number of presses is read in advance to calculate the air pressure Pex by reading the wrinkle pressing load Fsoi of the load number N = 1. The air pressure Pex calculation blocks 318c and 318
Illustration of the d and the air pressure adjusting blocks 320c and 320d is omitted. Further, Pt in the equation (11) is atmospheric pressure.

[0083]

## EQU00007 ## Fsoi = (Ax.Az/Ay) {(Pex + Pt) [Ve / (Ve-Az.Y)]-Pt} (11)

On the other hand, the dedicated controller 302 is
By performing signal processing according to a predetermined program in the OM, the functions shown in FIG. 20 are executed. In FIG. 20, the machine information memory 322 stores machine information previously input by key input or the like, and the mold information memory 324 is
A mold is attached to the press machine 150 and the transceiver 304 stores the mold information read from the ID card 306. In addition, the air pressure Pfx calculation block 326
Based on these machine information and mold information, the air pressure Pfx for lifting them by a force that balances the inner slide 164 and the punch mold 162 is calculated according to the following equation (12). The air pressure Pf adjusting block 328 is turned on and off so that the air pressure Pf in the air tank 268 detected by the air pressure sensor 272 becomes the calculated air pressure Pfx.
The F supply / exhaust valve 270 is switch-controlled. As a result, the press work can be performed with each press load Fpoi set as the mold information without being affected by the weight of the inner slide 164 and the punch mold 162.
The capacity of the air tank 268 is sufficiently large that the variation of the air pressure Pf due to the volume change of the four air cylinders 266 accompanying the lowering of the inner slide 164 is almost negligible. The pressure Pfx can also be calculated.

[0085]

[Equation 8] Pfx = (Wq + Wis) / Af (12)

The relative distance ha adjustment block 330, on the basis of the machine information and the mold information, sets the die height at four places so that the press work is performed with each wrinkle holding load Fsoi of Table 2 set as the mold information. The relative distance ha of the adjusting mechanism 172 is independently adjusted. First,
Based on the load Fai supplied from the strain gauge 178, the reference value ha ₀ which is the maximum value of the relative distance ha when the wrinkle pressing load Fsi is 0 is determined, and ha− shown in FIG. Fsi temporary characteristic (Fsi = c · h
a + d), the air pressure Pex calculation block 318
The one corresponding to the air pressure Pex obtained in a to 318d is selected. Then, based on the selected ha-Fsi provisional characteristics, the relative distance ha ₁ at which the wrinkle holding load Fsoi is obtained is obtained as shown in FIG. 24, and the reference value ha is obtained.
_The relative distance ha is set by the servomotor 174 based on _0.
Is adjusted to ha ₁ and the wrinkle holding load Fs ₁ is measured based on the signal supplied from the strain gauge 178 when the test press is performed in that state. Preset ha-Fsi
Since the temporary characteristics are set with reference to the case where the rigidity is higher than that of a normal die, the wrinkle holding load Fs ₁ is generally smaller than the wrinkle holding load Fsoi, and ha-
Fsi main characteristic (Fsi = c · ha + f) is calculated and
The relative distance hax at which the wrinkle pressing load Fsoi is obtained is determined from the ha-Fsi main characteristic, and the relative distance ha is controlled by the servomotor 174 to be hax. Wrinkle pressing load Fsoi used for adjusting the relative distance ha.
In the same manner as the air pressure Pex calculation blocks 318a to 318d, the data of the load number N = 1 in Table 2 is read, and although not shown, the die height adjusting mechanism 1 at four locations is read.
The relative distance ha of each of 72 is adjusted in the same manner as described above. As a result, regardless of the difference in rigidity of each press machine 150 or the difference in rigidity of each part in one press machine 150, the load number N = 1 in Table 2 is shown in each of the four wrinkle presser load adjusting parts. Wrinkle pressing is performed with each wrinkle pressing load Fsoi that is applied.

The relative distance hb adjustment block 332
Adjusts the relative distances hb of the four die height adjusting mechanisms 240 independently based on the machine information and the die information so that the press work is performed with each press load Fpoi set as the die information. However, it has exactly the same function as the relative distance h adjustment block 146 in the above embodiment.

In addition to the above controls, the dedicated controller 302 also has a predetermined load Fbi (i = 1, 2, 3,) for the loads Fbi detected at the four locations by the strain gauge 246. The air pressure Pg is controlled in the same manner as the control of the air pressure Pc in the above-described embodiment so as not to exceed 4). Since the air pressure Pg can be set independently of the mold used, it may be adjusted in advance by a manual operation or the like.

As described above, also in the press machine 150 of the present embodiment, the machine information unique to the press machine 150 stored in advance in the machine information memory 322 and the mold unique read from the ID card 306 via the transceiver 304. Based on the mold information of, the press conditions for performing the appropriate press working required by the tri-press, regardless of the rigidity of individual press machines and the difference in sliding resistance of each part,
That is, the air pressures Pdx, Pe, which are the press working conditions, are reproduced so that the wrinkle pressing load Fsoi and the press load Fpoi are reproduced.
x, Pfx, relative distances hax, hbx are obtained respectively, and the air pressures Pd, Pe, Pf,
Since the relative distances ha and hb are automatically initialized respectively, troublesome adjustment work due to trial and error is eliminated, the burden on the operator is greatly reduced, and a press-formed product of excellent quality is stable. Will be obtained.

On the other hand, in this embodiment, the air pressures Pd, Pe are
Air pressure sensors 212a-2 required to automatically adjust the
12d, 236 and ON / OFF supply / exhaust valve 214a-
Since 214d and 238 are arranged in the control box 202 and can be freely moved to be connected to each press machine 150, those air pressure sensors and O
The same control can be easily performed for a press machine that does not have an N, OFF supply / exhaust valve. Also,
For example, in order to explain the stabilizing effect of the press quality by the automatic pressure control of the air pressures Pd and Pe, when the control box 202 is brought to a factory in each place for demonstration, and only the necessary press machines are used. It is preferably used in a press processing line or the like that is operated to perform press work. Further, since the wrinkle pressing load Fsi at four locations, the balancer load by the air cylinder 216, etc. can be manually adjusted, and the air pressures Pe, Pd that generate these loads are displayed on the display meter 290.
It can also be suitably used when performing abnormality diagnosis of the press machine.

The air pressures Pd, Pe, Pf, and the relative distances ha, hb are not always exactly the air pressures Pdx, Pex,
It is not necessary to control to match Pfx and relative distances hax and hbx, but it is sufficient to perform control so as to fall within a predetermined allowable range that is predetermined so as to satisfy required press quality. It is the same.

On the other hand, after the air pressures Pd, Pe, Pf and the relative distances ha, hb are automatically initialized based on the mold information and machine information, the press machine 150 actually presses the molded product. In the case of mass production, the air pressure Pe is changed according to the number of presses and the stop time. That is, the controller 296 includes a load number N changing block 340, and the limit switch 276, the start switch 278, and the dedicated controller 30 are connected to the controller 296.
Press signal SP and start signal S supplied via 2
Calculate the number of presses and stop time based on S
In the calculation blocks 318a to 318d, the load number N at the time of reading the wrinkle pressing load Fsoi from Table 2 is changed. In the air pressure Pex calculation blocks 318a to 318d, the wrinkle pressing load Fsoi is read according to the thus changed load number N to calculate the air pressure Pex, while in the air pressure Pe adjustment blocks 320a to 320d, the air pressure Pex is calculated. The air pressure Pe is regulated according to. As a result, the respective wrinkle pressing loads Fsi in the four wrinkle pressing load adjusting portions are moved up and down as shown by the arrow Q in FIG. 24, and the load number N changing block 3
The wrinkle holding load Fsoi at the load number N set at 40 is set. The specific contents of the load number N changing block 340 are the same as those in the first embodiment.
The signal processing is performed according to the flowchart in FIG.

Therefore, also in this embodiment, the wrinkle holding load Fsoi and the wrinkling holding load Fsoi shown in Table 2 are reduced according to the number of presses, the air pressure Pe is correspondingly reduced, and the stop is stopped. The wrinkle pressing load Fsoi is increased according to the subtracted value α-stop time characteristic of FIG. 11 according to the time, and the air pressure P is correspondingly increased.
Since e is increased, an appropriate press-formed product without wrinkles or cracks is always manufactured regardless of the change in the passage resistance μ due to the temperature change of the mold. Further, since the wrinkle pressing load Fsoi, that is, the air pressure Pe is reduced according to the number of times of pressing, the mold is prevented from premature wear due to the excessive tension Te, and the heat generation amount Qs is reduced to reduce the heat radiation amount. Since the mold temperature to be balanced becomes low, the influence of heat is reduced in the entire press working.

This embodiment is one embodiment of the first invention and the second invention, and includes a load number N changing block 340.
And the air pressure Pex calculation blocks 318a to 318d correspond to the wrinkle pressing load control means, and the air pressure Pe adjustment blocks 320a to 320d and the ON / OFF supply / exhaust valve 2 are provided.
14a to 214d and the air pressure sensors 212a to 212d correspond to the wrinkle pressing load adjusting means. Further, the part that executes steps S7 and S8 in FIG. 6 and the limit switch 276 constitute a press number detecting means, and the timer TI reset in step S6 and the step TI of step S6 while the press machine 150 is stopped. Steps S1 and S2 that prevent execution correspond to the time counting means.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the first and third embodiments, the wrinkle holding load F is increased every time the number of presses exceeds the fixed number Co.
Although the s and Fsi were changed, the wrinkle holding load F was changed by changing the wrinkle holding load with a relatively small number of presses at the beginning of press working where the temperature change is relatively large.
The modification of s and Fsi is appropriately determined.

In the first and third embodiments, the number of presses is detected using the limit switches 124 and 276 which are turned on when the plungers 22 and 166 reach the lower end. Press machine 10,150
Various other press number detecting means such as detecting the number of presses from the rotation angle of the crankshaft can be adopted.

In the second embodiment, the press-formed product 3
Although the temperature of the upper surface of 54 is measured, the temperature of the lower surface of the press-formed product 354 may be measured, or the temperature of the wrinkle holding surface of the die mold 18 or the wrinkle holding ring 30 is measured. The temperature measurement part may be appropriately determined in consideration of the structure of the press machine, the plating conditions of the mold, and the like.

In the second embodiment, the radiation thermometer 35
Although 0 is attached to the machine frame 78 of the press machine 10, it may be arranged on the bolster 14, the slide plate 20, the punch die 12, the die die 18, or the like.

In the second embodiment, the third invention is applied to the single action type press machine 10, but the third embodiment is applied to the double action type press machine 150 as in the third embodiment. Of course, the invention can be applied. In that case, the temperature may be measured at each of four locations where the wrinkle holding load can be adjusted, and the wrinkle holding load may be changed according to the temperature of each part.

Further, in the above embodiment, the mold information is stored in the ID cards 96 and 306, and the controller 90,
Although it was designed to be read by the dedicated controller 302, the mold information is recorded on a bar code, a magnetic tape, a floppy disk, etc., and the contents can be read by a reader or the like connected to the controllers 90, 302. You can It is also possible to manually input mold information using a keyboard or the like.

Further, although the initial values of the air pressures Pa, Pe, etc. are automatically set in the above-mentioned embodiment, the air pressures Pa, Pe, The present invention can be similarly applied to the case of setting an initial value such as Pe. That is, the change amount ΔFs of the wrinkle pressing load is set according to the number of presses and the temperature change. For example, in the case of the first embodiment, the change air pressure ΔPa is calculated according to the following equation (13) and the change air is It is only necessary to change the air pressure Pa by the pressure ΔPa,
It is not always necessary to know the initial setting values of the wrinkle holding loads Fs and Fsi.

[0103]

(9) ΔPa = ΔFs / Aa (13)

Further, in the third embodiment, the air pressure Pe is adjusted in order to change the wrinkle pressing load Fsi according to the number of presses and the stop time. The relative distance ha of the die height adjusting mechanism 172 may be adjusted based on (ha + f).

In the third embodiment, the air pressures Pd, P
e regarding air pressure sensors 236, 212a to 212d and ON / OFF supply / exhaust valves 238, 214a to 21
Although only 4d is arranged in the control box 202 which is formed separately from the press machine 150, the air pressure P
The air pressure sensor 272, the ON / OFF supply / exhaust valve 270, and the like related to f are also controlled by the control box 2.
02 can be arranged. The air pressure sensors 236, 212a to 212d and the ON / OFF supply / exhaust valves 238, 214a to 214d are connected to the press machine 15.
No. 0 may be directly arranged, but of course the first embodiment, the second embodiment
The air pressure sensors 50, 86 and the ON / OFF supply / exhaust valves 46, 84 of the embodiment may be arranged in a control box or the like that is configured separately from the press machine 10.

Further, in the above embodiment, four air cylinders 80, 216, 266 for balancers are connected to common air tanks 82, 218, 268, respectively, but they are provided with independent air tanks. The air pressure may be adjusted independently.
The configurations of the press machines 10 and 150 can be appropriately changed.

Further, the arithmetic expressions (6) to (12) described in the above embodiment are merely examples, and the air pressure P can be obtained by using other approximate expressions or by using a data map.
A or the like may be required.

Although not illustrated one by one, the present invention can be carried out in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a claim of the present invention.

FIG. 2 is a configuration diagram showing an example of a single action type press machine in which the wrinkle holding load automatic changing device of the present invention changes the wrinkle holding load.

FIG. 3 is a configuration diagram showing a portion near a balancer air cylinder of the press machine in FIG.

FIG. 4 is a block diagram illustrating a control system of the press machine in FIG.

FIG. 5 is a block diagram illustrating the function of the controller of FIG.

FIG. 6 is a flowchart illustrating specific contents of a load number N changing block in FIG.

FIG. 7 is a diagram illustrating an aspect of load measurement for obtaining machine information of the press machine of FIG.

8 is a diagram showing an example of a load waveform obtained by the load measurement of FIG.

9 is a diagram showing the relationship between the wrinkle pressing load Fsi and the air pressure Pa obtained by the load measurement of FIG.

10 is a diagram showing a relationship between a press load Fpi and a relative distance h of the press machine shown in FIG.

11 is a diagram showing an example of a subtraction value α-stop time characteristic input as mold information in the press machine of FIG. 2. FIG.

FIG. 12 is a configuration diagram showing another example of a single action type press machine in which the wrinkle press load automatic changing device of the present invention changes the wrinkle press load.

13 is a diagram showing an example of a wrinkle holding load Fso-temperature θ characteristic input as mold information in the press machine of FIG.

14 is a block diagram illustrating a function of a controller in the press machine of FIG.

FIG. 15 is a configuration diagram showing an example of a double action type press machine in which the wrinkle holding load automatic changing device of the present invention changes the wrinkle holding load.

16 is a configuration diagram showing a portion in the vicinity of an outer-side balancer air cylinder of the press machine shown in FIG.

17 is a configuration diagram showing a portion in the vicinity of an air cylinder for an inner balancer of the press machine shown in FIG.

18 is a block diagram illustrating a control system of the press machine shown in FIG.

FIG. 19 is a block diagram illustrating the function of the controller in FIG.

20 is a block diagram illustrating the function of the dedicated controller in FIG.

21 is a front view showing the control box of FIG. 18. FIG.

22 is a left side view of the control box of FIG. 21. FIG.

23 is a diagram showing the relationship between the wrinkle holding load Fsi and the relative distance ha of the press machine shown in FIG.

FIG. 24 is a diagram for explaining how to determine the relative distance hax based on the load characteristics of FIG. 23.

FIG. 25 is a diagram illustrating an aspect of load measurement for obtaining machine information of the press machine in FIG. 15.

[Explanation of symbols]

10: Press machine 46: ON, OFF Air supply / exhaust valve (wrinkle presser load adjusting means) 50: Air pressure sensor (wrinkle presser load adjusting means) 90: Controller 124: Limit switch (press count detecting means) 134: Air pressure Pax calculation Block (wrinkle presser load control means) 136: Air pressure Pa adjustment block (wrinkle presser load adjustment means) 148: Load number N change block (wrinkle presser load control means) 150: Press machine 212a to 212d: Air pressure sensor (wrinkle presser) Load adjusting means) 214a to 214d: ON / OFF supply / exhaust valve (wrinkle pressing load adjusting means) 276: Limit switch (press number detecting means) 296: Controller 318a, 318b: Air pressure Pex calculation block (wrinkle pressing load controlling means) 320a, 320b: Air pressure Pe adjustment block Wrinkle retainer load adjusting means) 340: Load number N changing block (wrinkle retainer load control means) 350: Radiation thermometer (temperature detecting means) 356: Wrinkle retainer load Fso setting block (wrinkle retainer load control means) 358: Air pressure Pax Calculation block (wrinkle presser load control means) Steps S1, S2, S6: Clocking means Steps S7, S8: Pressing number detection means

Claims (3)

[Claims] 1. A press machine for performing drawing work while performing wrinkle holding, which is a device for automatically changing the wrinkle holding load when performing the wrinkle holding, wherein wrinkle holding load adjustment for adjusting the wrinkle holding load. Means, a press number detecting means for counting the number of presses that have been continuously pressed by the press machine, and the wrinkle holding load decreases as the number of presses counted by the press number detecting means increases. And a wrinkle pressing load control means for controlling the wrinkle pressing load adjusting means. 2. A press machine for performing drawing processing while performing wrinkle holding, which is a device for automatically changing the wrinkle holding load when performing the wrinkle holding, wherein wrinkle holding load adjustment for adjusting the wrinkle holding load. Means, a press number detecting means for counting the number of presses performed by the press machine in succession, a clocking means for measuring the stop time of the press machine, and a press counted by the press number detecting means Wrinkle pressing load control means for controlling the wrinkle pressing load adjusting means such that the wrinkle pressing load decreases as the number of times increases, and the wrinkle pressing load increases as the stop time measured by the timing means increases. An apparatus for automatically changing the wrinkle holding load of a press machine, which comprises: 3. A press machine for performing drawing processing while performing wrinkle holding, which is a device for automatically changing the wrinkle holding load when performing the wrinkle holding, wherein wrinkle holding load adjustment for adjusting the wrinkle holding load. Means, temperature detecting means for measuring the temperature of the wrinkle holding portion where the wrinkle holding is performed, and the wrinkle holding load becomes smaller as the temperature of the wrinkle holding portion measured by the temperature detecting means becomes higher. A wrinkle holding load automatic changing device for a press machine, comprising: a wrinkle holding load control means for controlling the holding load adjusting means.