JP2776250B2 - Adjusting method and device for equalizing cushion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure equalizing cushion device for a press machine, and more particularly to a method of adjusting a pressure equalizing cushion device in which a dimension of a piston of a hydraulic cylinder for pressure equalization is adjusted according to a press die. And devices.

[0002]

2. Description of the Related Art (a) A cushion pad to which a wrinkle pressing load is applied by a wrinkle pressing load applying means;
(C) a plurality of hydraulic cylinders disposed on the cushion pad and having an oil chamber communicated with each other; and (c) a plurality of hydraulic cylinders disposed on the hydraulic cylinder and supporting a wrinkle presser die at an upper end. A cushion pin, and at the time of press working, the pistons of the plurality of hydraulic cylinders are driven into the neutral state by the wrinkle pressing load, whereby the wrinkle pressing load is evenly applied to the plurality of cushion pins through the hydraulic cylinder. 2. Description of the Related Art A pressure equalizing cushion device of a press machine for dispensing to a press machine is known. An apparatus described in Japanese Patent Application Laid-Open No. 5-69050 is one example of such a press machine. In such a press machine, the wrinkle holding load is substantially reduced regardless of the variation in the length of the cushion pin and the inclination of the cushion pad. The wrinkle retainer can be evenly applied to the mold, and the surface pressure distribution of the wrinkle retainer is substantially constant, so that good press working can be performed.

Here, in order to distribute the wrinkle holding load evenly as described above, all the hydraulic cylinder pistons are driven into the cylinder at the time of press working irrespective of the variation of the length of the cushion pin and the like. At the same time, it is necessary to keep the piston in a neutral state so as not to reach the end of the stroke. For this reason, for example, in the pressure equalizing cushion device described in Japanese Patent Application Laid-Open No. 5-285557, the additional dimension Xav of the pressure equalizing piston of the hydraulic cylinder, the pressure receiving area As of the hydraulic cylinder, the bulk modulus K of the working oil used, and the oil volume V , Proper wrinkle holding load F
Based on the so and the number n of the cushion pins used, the appropriate initial hydraulic pressure Psso of the hydraulic cylinder, that is, the hydraulic pressure at the time of non-press working capable of uniformly distributing the wrinkle pressing load is determined so as to satisfy the following expression (1). The above-mentioned equalizing piston additional dimension Xav is an average value of the piston additional dimensions for bringing all the cushion pins into contact with the wrinkle presser die, regardless of the variation in the length of the cushion pin, the inclination of the cushion pad, etc. In order to prevent all pistons from being pushed into the cylinder by the cushion pins and not to reach the stroke end regardless of the impact during the press working, make sure experimentally or inconsistency in the length of the cushion pins or hydraulic pressure. It is determined for each press machine by an arithmetic expression or the like using the maximum stroke of the cylinder piston or the like as a parameter. The oil volume V is the total volume of the hydraulic oil in the oil chamber of the hydraulic cylinder and a series of hydraulic circuits communicating with the oil chamber when the pistons of all the hydraulic cylinders are located at the protruding ends. Yes, this oil volume V and pressure receiving area As,
The bulk modulus K is also determined according to the press machine, but the appropriate wrinkle pressing load Fso and the number n of cushion pins used are set for each press die by trial punching or the like so as to obtain appropriate press quality. You. Xav = (Fso−n · As · Psso) V / (n ² · As ² · K) (1)

Incidentally, the piston follow-up dimension X at which the pistons of all the hydraulic cylinders are in a neutral state is not a fixed value but is determined as a predetermined range, and within this range, the pressure is equalized. In order to stably obtain an equalized pressure state irrespective of errors, fluctuations, and the like, the equalizing piston follow-up dimension Xav is generally set to a median value within a stroke range in which the equalized pressure state can be obtained.

[0005]

However, the initial oil pressure Pss of the pressure equalizing cushion device is adjusted so as to obtain the pressure equalizing state as described above, and it is determined that the proper press quality can be obtained for each press die. Proper wrinkle holding load Fso
Even if press working is performed while performing wrinkle holding, desired press quality may not be obtained by a press machine. That is, the equalizing piston additional dimension Xav is determined depending on the circumstances of the press machine, and thus differs for each press machine. However, the equalizing piston additional dimension Xav is such that the wrinkle presser presses the press material with an appropriate wrinkle pressing load Fso. This is equivalent to the downward stroke of the wrinkle presser die, during which time a sufficient wrinkle presser load cannot be obtained, and the press material is relatively freely drawn in by being engaged with the punch die. If the values are different, the amount of inflow of the press material and the tension generated in the press material during press working change, and the desired press quality may not be obtained by the press machine. For example, FIG. 6 shows a state in which the wrinkle holding die 30 is lowered by the equalizing piston follow-up dimension Xav by the die 18 and the peripheral portion of the press material 29 is clamped with an appropriate wrinkle holding load Fso. As shown in the right half, when the equalizing piston additional dimension Xav is small, as shown in the right half.
Since the inflow amount of the press material 29 is smaller than that in the case where is large, the deformation amount (distortion) at the time of press working is large, and the press quality is different. In particular, in the case of a lock drawing in which the drawing of the press material is blocked and the drawing is performed, the difference in the amount of the press material flowing until the appropriate wrinkle pressing load Fso is obtained directly affects the amount of plastic deformation during the pressing. Press quality changes greatly.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a variation in press quality due to a difference in a dimension of a piston of a hydraulic cylinder.

[0007]

In order to achieve the above object, a first invention comprises (a) a cushion pad to which a wrinkle pressing load is applied by a wrinkle pressing load applying means; and (b) a cushion pad for the cushion pad. A plurality of hydraulic cylinders arranged on the pad and having the oil chambers communicate with each other;
(C) a plurality of cushion pins respectively disposed on the hydraulic cylinder and supporting a wrinkle presser die at an upper end, and the pistons of the plurality of hydraulic cylinders are driven by the wrinkle press load during press working. And adjusting the pressure equalizing cushion device of the press machine to evenly distribute the wrinkle pressing load to the plurality of cushion pins through the hydraulic cylinder by the hydraulic cylinder during the press working. It is characterized in that the additional dimension of the piston of the cylinder is adjusted so as to have a predetermined set dimension according to the press die so as to obtain appropriate press quality.

[0008]

In other words, a press machine that is used in actual press working with the press die mounted beforehand is determined in advance according to the press die as the set-up dimension of the piston when proper press quality is obtained. The press working is performed by adjusting the additional dimension of the piston of the pressure equalizing cushion device to the above set size.

[0009] Here, the above set dimension is a piston follow-up dimension when an appropriate press quality is obtained. Therefore, generally, the pistons of all the hydraulic cylinders are in a neutral state and the wrinkle pressing load is reduced to a plurality of cushion pins. Is determined within a range where a pressure equalized state that is evenly distributed is obtained. As a method of obtaining the set dimensions, for example, in a try-out stage of performing a trial hit using a tri-press and correcting a press die so as to obtain appropriate press quality without defects such as wrinkles and cracks, the actual hydraulic pressure is determined. It can be obtained by performing trial shots while changing the initial oil pressure of the cylinder and changing the piston follow-up dimension. However, the finite element method (FEM: Finite Eleme) is based on the shape of the press die and wrinkle holding surface.
nt Method) to simulate the progress of the press working and calculate the optimal piston follow-up dimensions to obtain the proper press quality, in other words, the descending stroke of the wrinkle press type until the specified wrinkle press load is obtained. You may do it.

On the other hand, the adjustment of the additional dimension of the piston of the equalizing cushion device of the press machine used for the actual press working is performed, for example, by substituting the above set dimension into the additional dimension Xav of the equalizing piston of the formula (1). Find the hydraulic pressure Psso,
The initial hydraulic pressure Pss of the hydraulic cylinder is changed to its proper initial hydraulic pressure Psso.
The pressure should be adjusted to. When other physical quantities included in the equation (1), such as the oil volume V and the number n of used cushion pins, can be changed, it is also possible to change them to adjust the piston follow-up dimension to the set dimension. Also,
The above equation (1) is not always absolute, for example, the bulk modulus of elasticity K changes due to air mixing or deterioration of the hydraulic oil. Therefore, test driving is performed while changing the initial hydraulic pressure Pss, etc. It is also possible to measure the follow-up dimension of the piston with a displacement sensor or the like while performing hydraulic control while maintaining it at the bottom dead center, and adjust the dimension so as to become the set dimension.

In the equalizing cushion device of a press machine used for actual press working, the range of the additional dimension of the piston in which an equalized state can be obtained depends on the variation of the length of the cushion pin, the maximum stroke of the piston of the hydraulic cylinder, and the like. In some cases, an equalized pressure state cannot be obtained with the set dimensions determined according to the press die, but in that case, it is desirable to adjust the piston follow-up dimension within a range where the equalized pressure state can be obtained. . However, in order to obtain appropriate press quality, it is only necessary that the inflow of the press material is the same until a predetermined wrinkle holding load is obtained. When the size is small, it is possible to cope with the problem by increasing the initial height of the wrinkle presser by adjusting the position of the cushion pad or the like.

[0012]

According to the adjusting method of the present invention as described above, the additional dimension of the piston at the time of press working is constantly adjusted according to the press die regardless of the individual difference of the press machine. The inflow amount of the press material until the wrinkle holding load can be obtained is substantially constant, and the variation in the press quality due to the difference in the inflow amount is avoided, so that the proper press quality can always be obtained.

[0013] The amount of inflow of the press material is determined by the height of the wrinkle pressing die relative to the punch die when a predetermined wrinkle pressing load can be obtained. However, the dimensional error of the cushion pin or the like is not so large as to affect the inflow of the press material. That is,
In order to obtain a pressure equalized state, even if the dimensional error of the cushion pin etc. is extremely small, it has a great effect.Therefore, it is necessary to arrange a hydraulic cylinder to equalize the pressure. The height of the wrinkle retainer does not change so much as to affect the inflow.

[0014]

According to a second aspect of the present invention, there is provided the above-mentioned (a) cushion pad, (b) a plurality of hydraulic cylinders, and (c) a plurality of cushion pins, and a wrinkle pressing load during press working. The pistons of a plurality of hydraulic cylinders are driven into a neutral state, respectively, so that the wrinkle pressing load is evenly distributed to a plurality of cushion pins through the hydraulic cylinders. (D) Regarding the dimension of the piston of the hydraulic cylinder at the time of press working,
(E) input means for inputting a predetermined set dimension according to the press die so that an appropriate press quality is obtained;
Adjusting means for automatically adjusting the pressure equalizing cushion device so that the piston follow-up dimension becomes the set dimension.

[0015]

In other words, the second invention relates to an adjusting device for automatically adjusting the pressure equalizing cushion device according to the adjusting method of the first invention, wherein a predetermined dimension is set in accordance with a press die. Is input by the input means, the pressure equalizing cushion device is automatically adjusted by the adjusting means so that the piston follow-up dimension becomes the set dimension. The resulting variation in press quality is avoided, and proper press quality is always obtained. Further, since the adjusting device of the present invention is configured to automatically adjust the pressure equalizing cushion device so that the piston follow-up size becomes the set size by inputting the set size, the operator needs to manually operate the adjusting device. As compared with the case of adjustment, the burden on the operator is reduced, and improper adjustment due to an operation error or the like is prevented.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the press machine 10 of FIG. 1, the bolster 14 to which the punch mold 12 is attached is positioned and fixed at a predetermined position on the bed 16, while the slide plate 20 to which the die 18 is attached is shown via four plungers 22. It can be moved up and down by a lifting drive means that does not. The bolster 14 is provided with a large number of through holes 26 for disposing the cushion pins 24, and a cushion pad 28 for supporting the cushion pins 24 is disposed below the bolster 14. . The cushion pins 24 support the wrinkle presser die 30 disposed together with the punch die 12, and are provided in an arbitrary number at predetermined positions predetermined according to the shape of the wrinkle presser die 30 and the like. You. A press die is constituted by the punch die 12, the die die 18, and the wrinkle press die 30, and is used by being removably attached to the press machine 10, and is used by the die die 18 and the wrinkle press die 30.
The punching process is performed by the punch die 12 and the die die 18 while wrinkling the peripheral portion of the press material 29. On the upper surface of the wrinkle holding die 30, that is, the wrinkle holding surface,
A projection 31 is formed on the press material 29 to form a bead to provide inflow resistance.

The cushion pad 28 has a through hole 26
And a plurality of hydraulic cylinders 32 corresponding to the hydraulic cylinders 3.
The second piston rod can be brought into contact therewith. The oil chambers of the hydraulic cylinders 32 are communicated with each other, and the hydraulic oil is supplied from a pump 34 via a check valve 39 and the electromagnetic on-off valve 36 is controlled to open and close. The indoor hydraulic pressure Ps is adjusted. This oil pressure Ps is detected by the oil pressure sensor 38, and the hydraulic pressure Ps is applied to the plurality of cushion pins 24 evenly, in other words, all the pistons of the hydraulic cylinders 32 involved in the wrinkle pressing are set to the neutral state. It is adjusted to become. The cushion pad 28 can be moved up and down while being guided by the guide 40, and is always urged upward by the air cylinder 42. Air cylinder 42
The air chamber 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 supply / exhaust valve 46, and an ON / OFF supply / exhaust valve is provided. The air pressure P in the air chamber and in the air tank 44 is controlled by the
a is adjusted. The air pressure Pa is detected by the air pressure sensor 50 and is adjusted according to the wrinkle holding load Fs. The air cylinder 42 corresponds to a wrinkle pressing load applying means.
2, the pressure equalizing cushion device 52 includes the cushion pad 28, the hydraulic cylinder 32, the cushion pin 24, and the like.

The press machine 10 includes a controller 60 shown in FIG. 2 so that signals representing the air pressure Pa and the oil pressure Ps output from the air pressure sensor 50 and the oil pressure sensor 38 are supplied. It has become. The controller 60 includes a microcomputer having a CPU, a RAM, a ROM, an input / output interface circuit, an A / D converter, and the like. The controller 60 uses a temporary storage function of the RAM and transmits signals according to a program stored in the ROM in advance. Processing is performed, and a drive signal for switching the ON / OFF supply / exhaust valve 46 and the opening / closing valve 36 and changing the operation state of the pump 34 is output. The controller 60 includes a machine information memory 62 and a mold information memory 64.
The machine information memory 62 stores machine information specific to the press machine in advance, while the mold information memory 64 stores an ID attached to the punch mold 12.
The mold information unique to the mold read from a storage medium 66 such as a card (see FIG. 1) by a reading device 68 such as a transceiver is stored. The machine information and the mold information are information necessary for determining the air pressure Pa and the oil pressure Ps that can perform appropriate press working, and are, for example, as follows. (Machine information)-Weight Wa of cushion pad 28-Weight Wp of cushion pin 24-Pressure receiving area Aa of air cylinder 42-Pressure receiving area As of hydraulic cylinder 32-Bulk elastic modulus K of hydraulic oil-Oil volume V-Equivalent pressure stroke Range Xmax, Xmin (Die information) ・ Weight of wrinkle presser die 30 ・ Appropriate wrinkle press load Fso ・ Number of cushion pins 24 used n ・ Appropriate piston follow-up dimension Xo

Here, the equalizing pressure stroke range Xmax,
Xmin is a maximum value and a minimum value of a piston follow-up dimension at which an equalized pressure state can be obtained. Depending on variations in the length dimension of the cushion pin 24 to be used and the maximum stroke of the piston of the hydraulic cylinder 32, Xmin is used for experiments and error measurement. Is set by Also, the proper wrinkle holding load Fso is the punch type 1
For example, the die 2, the die 18 and the wrinkle presser 30 are attached to a tri-press having the same configuration as the press machine 10 shown in FIG. 1, and press working is performed while changing the air pressure Pa.
The wrinkle holding load when an appropriate press quality is obtained is measured by a strain gauge or the like attached to the plunger 22, and the lifting force by the balancer air cylinder 72 provided between the machine frame 70 and the slide plate 20 is reduced. If the press working is performed so as to be balanced with the slide plate 20 and the die 18, it is possible to obtain a pure appropriate wrinkle pressing load Fso for pressing the press material 29.
The load generated in the air cylinder 42 is obtained from the air pressure Pa and the pressure receiving area Aa, and the weight Wa of the cushion pad 28 including the hydraulic cylinder 32, the weight Wp of the cushion pin 24,
It is also possible to obtain the proper wrinkle holding load Fso by subtracting the weight Wr of the wrinkle holding die 30.

The proper piston additional dimension Xo corresponds to the set dimension of claim 1, and is the piston additional dimension X when proper press quality is obtained. For example, it is configured similarly to the press machine 10 shown in FIG. At the try-out stage in which a trial hit is performed using a tri-press, the air pressure Pa is set so that the wrinkle press is performed with the appropriate wrinkle press load Fso.
After adjusting the pressure, by actually changing the initial hydraulic pressure Pss and changing the piston follow-up dimension X, a trial shot is performed,
What is necessary is just to obtain the dimension Xo when the optimum press quality is obtained. The bulk modulus K is expressed by the following equation (2) using the initial oil pressure Pss, the generated oil pressure Psx during press working, the oil volume V, and the change amount ΔV of the oil volume. Therefore, the piston follow-up dimension X is eventually expressed by the following equation (4), and the initial oil pressure Pss and the generated oil pressure Psx when the optimum press quality is obtained are detected by the oil pressure sensor 38. Then, the appropriate piston follow-up dimension Xo can be obtained according to the equation (4). K = (Psx−Pss) / (ΔV / V) (2) ΔV = n · As · X (3) X = (Psx−Pss) · V / (n · As · K) ·・ ・ (4)

The initial hydraulic pressure Pss and the generated hydraulic pressure Psx are shown in FIG.
In the area A where the initial oil pressure Pss is the highest, all the pistons of the hydraulic cylinders 32 do not operate at all, but in the area B where the initial pressure is lower, the length variation of the cushion pin 24 varies. Thus, the pistons of some of the hydraulic cylinders 32 are driven into the cylinders. When the follow-up dimension of the piston increases with a decrease in the initial hydraulic pressure Pss, the number of operating hydraulic cylinders 32 increases, and the wrinkle pressing load Fs is distributed to the hydraulic cylinders 32. Therefore, in the region B, the initial hydraulic pressure Pss Decreases, the generated hydraulic pressure Psx decreases. In the area C, the cushion pins 24 are disposed, and the pistons of all the hydraulic cylinders 32 involved in the wrinkle holding are driven into the cylinders and are kept in a neutral state where they do not reach the stroke ends. , And are equally distributed to the cushion pins 24 via the hydraulic pressures of the hydraulic cylinders 32. This C region is a pressure equalizing stroke range. In this range, the piston pressure only slightly moves to the stroke end side as the initial hydraulic pressure Pss decreases, and the generated hydraulic pressure Psx is substantially constant. In the region D, the pistons of some of the hydraulic cylinders 32 are in a torsion state reaching the stroke end, and the wrinkle pressing load Fs is transmitted without the intermediary of the hydraulic pressure. Therefore, the generated hydraulic pressure Psx is generated with a decrease in the initial hydraulic pressure Pss.
Becomes smaller. Therefore, a trial shot is performed while changing the initial oil pressure Pss to obtain the initial oil pressures Pss1 and Pss2 at both ends of the region C where the pressure is equalized, and the initial oil pressure Pss3 for obtaining appropriate press quality is obtained. From the maximum stroke Xst of the 32 pistons, the appropriate piston follow-up dimension Xo can be approximately determined according to the following equation (5). Xo = Xst · (Pss2-Pss3) / (Pss2-Pss1) (5)

The displacement of the wrinkle presser die 30 and the cushion pad 28 due to the press working is measured using an accelerometer, a displacement sensor, or the like with reference to the bolster 14 or the like, and the difference between the displacements is calculated as the piston insertion dimension X. You may do it. Further, the progress of the press working is simulated based on the shape of the forming surface of the punch die 12 and the shape of the wrinkle holding surface of the wrinkle holding die 30, and the like, and the optimal piston follow-up dimension for obtaining appropriate press quality, in other words, the appropriate wrinkle holding It is also possible to calculate the descending stroke of the wrinkle presser die 30 until the load Fso is obtained.

When the equalizing stroke ranges Xmax and Xmin are determined experimentally, characteristics such as those shown in FIG. 3 are obtained and the initial hydraulic pressures Pss1 and Pss2 and the generated hydraulic pressure Psx at that time are calculated according to the above equation (4). Initial hydraulic pressure Pss1, Pss
It is possible to determine the additional dimension X of the piston at the time of 2 by measuring it with a displacement sensor or the like. However, in this case, it is not necessary to perform the test hitting by attaching an actual press die, and some member is placed on the cushion pin 24 so that the piston of the hydraulic cylinder 32 is driven by the vertical movement of the slide plate 20. It may be carried out by mounting.

Next, the operation when the controller 60 automatically adjusts the air pressure Pa and the oil pressure Ps based on the machine information and the mold information so as to obtain an appropriate press quality will be described. First, with respect to the air pressure Pa, necessary information is read from the machine information memory 62 and the mold information memory 64, an appropriate air pressure Pax is calculated according to the following equation (6), and detected by the air pressure sensor 50. The air pressure Pa in the air tank 44 is the appropriate air pressure P
The ON / OFF supply / exhaust valve 46 may be switched so as to be set to ax, whereby the proper wrinkle presser set as the mold information regardless of the difference in the weight Wa of the cushion pad 28 for each press machine 10 or the like. Wrinkle holding is performed by the load Fso. Pax = (Fso + Wa + Wr + n · Wp) / Aa (6)

The hydraulic pressure Ps of the hydraulic cylinder 32 is adjusted according to, for example, a flowchart shown in FIG. In step S1 of FIG. 4, the pressure receiving area As, the bulk elasticity coefficient K, the oil volume V, the maximum value Xmax and the minimum value Xmin of the equalizing stroke range are read from the machine information memory 62, and the proper crimping is performed from the mold information memory 64. Pressing load Fso,
The used number n and the appropriate piston additional dimension Xo are read.
In steps S2 and S3, it is determined whether or not the proper piston follow-up dimension Xo is equal to or greater than the minimum value Xmin and equal to or less than the maximum value Xmax. If Xmin ≦ Xo ≦ Xmax, step S2 is performed.
In step 4, the appropriate initial hydraulic pressure Psso is calculated by substituting the appropriate piston additional dimension Xo for the piston additional dimension X in the following equation (7). If Xo <Xmin, the piston additional dimension X in the following equation (7) is determined in step S5. Is calculated by substituting the minimum value Xmin into the minimum hydraulic pressure Psso, and if Xmax <Xo, the maximum initial value Xmax is substituted into the piston follow-up dimension X of the following equation (7) in step S6 to calculate the proper initial hydraulic pressure Psso. .
Then, when the appropriate initial oil pressure Psso is calculated in steps S4, S5, or S6, in step S7, the oil pressure Ps detected by the oil pressure sensor 38 while the slide plate 20 is held at the top dead center, ie, The pump 34 and the on-off valve 36 are controlled so that the initial oil pressure Pss becomes the appropriate initial oil pressure Psso. This gives X
If min ≦ Xo ≦ Xmax, the press working is performed in a state where the piston of the hydraulic cylinder 32 is driven by the appropriate piston follow-up dimension Xo set as the mold information, and the press working is performed in an equal pressure state. At the same time, appropriate press quality is reproduced. X = (Fso-n · As · Psso) V / (n 2 · As 2 · K) ··· (7)

As described above, in the press machine 10 according to the present embodiment, regardless of the individual difference of the press machine 10, the piston extra dimension X at the time of press working is set to the appropriate piston extra dimension Xo predetermined according to the press die. Therefore, the flow rate of the press material 29 until the appropriate wrinkle pressing load Fso is obtained is substantially constant, and the variation in press quality due to the difference in flow rate is avoided, and the proper press quality is always obtained. Can be obtained.

Also, the proper piston follow-up dimension Xo
Is stored in the storage medium 66 attached to the punch mold 12 and is automatically read by the reading device 68 into the controller 60. On the other hand, the controller 60 determines that the piston additional dimension X during the press working is the proper piston additional dimension Xo. Since the hydraulic pressure Ps of the hydraulic cylinder 32, in this embodiment, the initial hydraulic pressure Pss is automatically adjusted by the pump 34 and the on-off valve 36,
Compared to a case where the operator adjusts the hydraulic pressure by operating a switch while looking at a hydraulic meter or the like, the burden on the operator is reduced, and poor adjustment due to a work error or the like is prevented.

In this embodiment, the reading device 68 for reading the proper piston follow-up dimension Xo corresponds to the input means, and a part of the series of signal processing by the controller 60 for executing steps S1, S4 and S7 in FIG. , The pump 34, the on-off valve 36, and the oil pressure sensor 38 together constitute an adjusting device, and the adjusting device of the pressure equalizing cushion device 52 is configured to include the adjusting device.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, in the above-described embodiment, the proper initial oil pressure P at which the proper piston follow-up dimension Xo is obtained according to equation (7).
sso was calculated, but the test hydraulic pressure was changed while the initial hydraulic pressure Pss was changed, and the generated hydraulic pressure Psx was measured.
Based on the initial hydraulic pressures Pss1 and Pss2 at both ends of the equalizing region C, the appropriate piston follow-up dimension Xo, and the maximum stroke Xst of the hydraulic cylinder 32, the initial hydraulic pressure of the equation (5) is obtained. Pss3 may be calculated as the appropriate initial oil pressure Psso. In this case, it is possible to perform all of them automatically including the test hits,
Perform a test hit with operator's switch operation, etc. to set the initial hydraulic pressure Pss
After the relationship between the initial hydraulic pressure Pss and the generated hydraulic pressure Psx is obtained, the initial hydraulic pressure Pss may be automatically adjusted by the adjusting means based on the relationship.

The amount of displacement caused by the press working of the wrinkle presser die 30 and the cushion pad 28 is measured by a displacement detecting means such as an accelerometer or a displacement sensor with reference to the bolster 14 and the like, and the difference between the displacements is measured. The hydraulic fluid is calculated by the pump 34 and the opening / closing valve 36 in a state where the slide plate 20 of the press machine 10 is held at the bottom dead center, for example, so that the piston additional dimension X becomes the appropriate piston additional dimension Xo. Supply and discharge control may be performed. Again,
Automatic adjustment is possible.

It is also possible to adjust the hydraulic pressure Ps using a test stand 76 as shown in FIG. Test stand 76
Has a positioning member 78 and a flat plate 80, and measures a distance Dsi to a pin 84 for detecting a displacement by a displacement sensor 82 attached to the lower surface of the flat plate 80, and averages the distance Dsi associated with the press operation. Change Δ
The supply and discharge of hydraulic oil may be controlled by the pump 34 and the on-off valve 36 so that Ds becomes the appropriate piston follow-up dimension Xo. Also in this case, the appropriate piston follow-up dimension Xo can be automatically adjusted by the adjusting means by being input by the input means such as a keyboard. The input means may input the set dimensions by the manual operation of the operator as described above.

In the above-described embodiment, the hydraulic pressure is controlled by the pump 34 and the on-off valve 36. However, a hydraulic cylinder for pressure adjustment for changing the volume V of the hydraulic oil may be provided. Various other adjustment means capable of adjusting the dimension X can be employed.

In the above-described embodiment, the wrinkle holding load Fs is applied based on the air pressure Pa of the air cylinder 42. However, the wrinkle holding load Fs is applied by the relief pressure of the hydraulic cylinder, a spring, or the like. You can also.

Although not specifically exemplified, the present invention can be embodied in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of a press machine provided with an adjustment device according to claim 2, which can suitably execute the adjustment method according to claim 1.

FIG. 2 is a block diagram illustrating a control system of the press machine in FIG.

FIG. 3 is a diagram illustrating a relationship between an initial oil pressure Pss of a pressure equalizing hydraulic cylinder and a generated oil pressure Psx in the press machine of FIG.

4 is a flowchart illustrating an operation of adjusting a follow-up dimension of a piston of a hydraulic cylinder for equalizing pressure in the press machine of FIG.

FIG. 5 is a view showing an example of a means for detecting a piston follow-up dimension of a hydraulic cylinder for equalizing pressure in the press machine of FIG. 1;

FIG. 6 is a diagram illustrating a difference in the inflow amount of the press material when the piston follow-up dimension is different.

[Explanation of symbols]

 10: Press machine 24: Cushion pin 28: Cushion pad 32: Hydraulic cylinder 34: Pump 36: Open / close valve 38: Hydraulic sensor 42: Air cylinder (wrinkle pressing load applying means) 52: Equalizing cushion device 60: Controller 68: Read Apparatus (input means) Xo: proper piston follow-up dimension (set dimension) Steps S1, S4, S7: adjustment means

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI B30B 15/02 B30B 15/02 C (56) References JP-A-5-285557 (JP, A) JP-A 5-57363 (JP, A) JP-A-2-99300 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 24/02 B21D 24/08 B21D 24/10 B30B 15/02

Claims (2)

(57) [Claims] 1. A cushion pad to which a wrinkle pressing load is applied by a wrinkle pressing load applying means, a plurality of hydraulic cylinders disposed on the cushion pad and having an oil chamber communicated with each other, and A plurality of cushion pins respectively provided and supporting a wrinkle presser die at an upper end, wherein the pistons of the plurality of hydraulic cylinders are driven into neutral by the wrinkle press load during press working. By
A method of adjusting a pressure equalizing cushion device of a press machine for uniformly distributing the wrinkle pressing load to the plurality of cushion pins via the hydraulic cylinder, wherein a piston follow-up dimension of the hydraulic cylinder during press working is appropriate. A method for adjusting a pressure equalizing cushion device, comprising adjusting a predetermined dimension according to a press die so as to obtain press quality. 2. A cushion pad to which a wrinkle pressing load is applied by a wrinkle pressing load applying means, a plurality of hydraulic cylinders disposed on the cushion pad and having an oil chamber communicated with each other; A plurality of cushion pins respectively provided and supporting a wrinkle presser die at an upper end, wherein the pistons of the plurality of hydraulic cylinders are driven into neutral by the wrinkle press load during press working. By
An adjusting device for a pressure equalizing cushion device of a press machine for evenly distributing the wrinkle pressing load to the plurality of cushion pins via the hydraulic cylinder, wherein an appropriate size of a piston follow-up dimension of the hydraulic cylinder during press working. Input means for inputting a predetermined set dimension according to the press die so that press quality is obtained, and adjusting means for automatically adjusting the pressure equalizing cushion device so that the piston follow-up dimension becomes the set dimension. An adjusting device for an equalizing cushion device, comprising: