JP2000015354A - Press machine with hydraulic die cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate a pit for setting a press machine, to easily execute the maintenance and the checking without damaging the rigidity of a bed and to enable preventing of damaging of the rigidity of a bolster by incorporating a hydraulic die cushion in the press machine into the bolster. SOLUTION: The bolster 6 is constituted with three parts of an upper bolster 61, intermediate bolster 62 and lower bolster 63. The hydraulic die cushion is arranged in the intermediate bolster 62. Plural vertical holes are bored in the intermediate bolster 62 and pistons 81 are incorporated in the vertical holes. At the time of rapidly supplying the hydraulic oil into the cylinders 82, the pistons 81 are raised and the cushion pins are rapidly raised. A die lifter 8 is inserted into a gap between the upper bolster 61 and the intermediate bolster 62 and the hydraulic oil is supplied into an oil passage 84, the upper bolster 61 is floated up. The die lifter 8 is inserted into a groove arranged between the upper bolster 61 and the intermediate bolster 62, and the upper bolster 61 is raised by working the piston 81 to execute the maintenance and the checking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic die cushion device applied to a press machine.
In other words, it relates to a hydraulic die cushion device that operates at a high speed without losing the rigidity of the bolster with a small space for mounting and that can adjust the wrinkle holding force to obtain products of different shapes by drawing. is there.

[0002]

2. Description of the Related Art A hydraulic die cushion device applied to a conventional press machine is usually installed in a bed. In this case, a pit is required for installation space and maintenance. Providing this pit imposes a heavy burden on the person who installs the press machine in terms of cost and effective use of factory space.

[0003] Further, by providing a hydraulic die cushion device in the bed, it is necessary to provide a space for mounting in the bed, which reduces the rigidity of the bed. As a result, the bed is deformed or deformed during press working. Then, the deformation of the mold is increased, and there is a problem that the shape of the mold needs to be corrected or reinforced accordingly.

[0004]

A first object of the present invention is to eliminate the need for a pit for installing a press machine. The second purpose is not to impair the rigidity of the bed. The third purpose is that maintenance and inspection are easy. The fourth object is not to impair the rigidity of the bolster. A fifth object is to raise the hydraulic cylinder device at a high speed corresponding to the sliding speed of the mechanical press. A sixth object is to make the wrinkle holding force locally adjustable with respect to the mold.

[0005]

In order to achieve the first and second objects, a hydraulic die cushion is provided inside a bolster. In order to achieve the third object, the bolster is divided into an upper bolster 61, an intermediate bolster 62, and a lower bolster 63, and a T groove or the like for mounting a mold is provided on the upper surface of the upper bolster 61. Provide a hole into which the cushion pin is inserted. Also, the height for die change, which is usually used in mold exchange, is changed so that the upper bolster can be pulled out. A hydraulic cylinder for fixing the upper bolster is provided in the intermediate bolster in order to facilitate attachment and detachment of the upper bolster, and a bolster for clamping the hydraulic cylinder is provided in the upper bolster for fixing during press working. A T-groove or the like is provided on the lower surface.

In order to achieve the fourth object, the hydraulic cylinder device is embedded in the intermediate bolster 62 so as to reduce the thickness of the intermediate bolster 62 as much as possible.

In order to achieve the fifth object, the hydraulic cylinder device of the intermediate bolster 62 is provided with an ascending rapid cylinder 8.
2 was incorporated. The rapid cylinder 82 has a structure in which the effective sectional area of the cylinder is small and a long stroke operation is performed with a small amount of pressure oil.

In order to achieve the sixth object, the pressure of the pressure oil supplied to the hydraulic cylinder device of the intermediate bolster 62 is changed in accordance with the position of the slide of the press machine, that is, the pressure command based on the slide stroke. Further, the pressure is changed for each group of the plurality of hydraulic cylinder devices, and the wrinkle holding force can be locally adjusted with respect to the mold.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a crown 1, a column 2 and a bed 3 are integrated by being fastened by tie rods to form a frame of a press machine. Crown 1
, A crankshaft 11 is rotatably provided, and the crankshaft 11 includes a motor, a flywheel,
It is driven and rotated through clutches, brakes, gears and the like.

A slide 4 is guided to the column 2 and is incorporated so as to be able to move up and down. Crankshaft 1
The eccentric part 1 and the slide 4 are connected by a connecting rod 12,
When the crankshaft 11 rotates, the slide 4 moves up and down.

The column 2 is provided with a position detector 5,
The position of the slide 4 is detected. Since the detector 5 detects the slide stroke, the detector 5 may be replaced with a configuration for detecting the position of the mold, a configuration for detecting the rotation angle of the crankshaft, or the like, for detecting the slide stroke. .

A bolster 6 is fixed to the bed 3. An upper die and a lower die are mounted on the slide 4 and the bolster 6, respectively.
Is pressed by moving up and down. The bolster 6 may be a moving bolster as described later.
In this case, the bolster 6 is provided with running wheels.

The bolster 6 comprises an upper bolster 61, an intermediate bolster 62 and a lower bolster 63, as shown in FIG.
Parts, which are integrated by bolts.
The upper bolster 61 has a function of mounting a lower die.
That is, a T groove or a tapped hole for fixing the lower mold is provided as needed. Further, a die lifter device for loading and unloading the die onto and from the bolster 6 is appropriately provided. As the die lifter device, a known device that raises and lowers a plate with rollers by a hydraulic cylinder is used.

The intermediate bolster 62 is provided with a plurality of hydraulic cylinder devices for generating a wrinkle pressing force.
And, in these hydraulic cylinder devices, a quick cylinder 82 for rapidly raising a cushion pin or a piston is incorporated.

That is, a plurality of vertical holes are formed in the intermediate bolster 62, and a piston 81 for generating a wrinkle pressing force may be accommodated in the vertical holes. The piston 81 moves up and down by the pressure oil. A cushion pin is set up on the piston 81, and a hole for passing the piston 81 and these cushion pins is formed in the upper bolster 61.

A quick cylinder 82 is incorporated in the piston 81. The quick cylinder 82 is cylindrical and has a lower end incorporated in a lower bolster. When the pressurized oil is supplied to the rapid cylinder 82, the piston 81 is pushed up by the pressurized oil acting on the small area portion. Therefore, the cushion pin is rapidly raised by the piston 81.

The lower bolster 63 is provided with oil passages 83, 84, and 85 which communicate with the cylinder device and through which pressure oil for operating the piston 81 passes.

The upper bolster 61 and the intermediate bolster 62
A groove for inserting a die lifter 8 is provided. The die lifter 8 is used to move the upper bolster 61. The die lifter 8 has a structure in which a large number of rollers are rotatably incorporated in a long plate-shaped base material, and the outer periphery of the rollers protrudes from the upper and lower surfaces of the plate-shaped base material. The object received by the die lifter 8 moves with the rotation of the rollers.

In FIG. 3, when the die lifter 8 is inserted between the upper bolster 61 and the intermediate bolster 62 and pressurized oil is supplied to the oil passage 84, the upper bolster 61 floats. In this state, the upper bolster 61 can travel.

4 and 5, a draw-out rail 31 is provided adjacent to the press machine so as to be adjustable in height.
The draw-out rail 31 is supported by a cylinder device composed of a cylinder 32 and a piston 33 fitted thereto, and has a structure in which the height can be changed. Rollers are embedded in the upper part of the draw-out rail 31 so as to correspond to the die lifter 8. Further, a lock device 34 is provided above the cylinder 32. This is for holding the drawer rail 31 at a constant height.

When the upper bolster 61 is separated from the intermediate bolster 62 for maintenance and inspection and is moved outside the press machine, the bolts fixing the upper bolster 61 to the intermediate bolster 62 are removed, and the upper bolster 61 and the intermediate bolster 61 are removed. 6
The die lifter 8 is inserted into the groove provided over 2
The piston 81 related to the die lifter 8 is operated. The upper bolster 61 rises with the rise of the die lifter 8 and becomes movable by the action of the rollers 81.

On the other hand, the draw-out rail is set at a lower limit, that is, at a height where the upper surface of the draw-out rail 31 matches the lower surface of the upper bolster 61. In this state, the upper bolster 61 can move onto the draw-out rail 31 from above the intermediate bolster 62. When the maintenance and inspection of the bolster 6 is completed, the upper bolster 61 is moved above the intermediate bolster 62 and the upper bolster 61 is fixed to the intermediate bolster 62 with bolts.

In FIG. 5, when the draw-out rail 31 is set at the upper limit, the upper surface of the draw-out rail 31 is
And the die 11 can be moved by a die lifter device provided above the upper bolster 61.

FIG. 6 is a circuit diagram for controlling the hydraulic cylinder of the intermediate bolster 62. Pressure oil from the hydraulic pump is supplied to a hydraulic cylinder through a switching valve 92, a servo valve 91, and the like. A pressure calculation unit that receives a signal from a pressure command generator that generates data set in advance according to press working, a signal from a position detector 5 that detects a position of a slide, and a signal from a pressure detector provided in an oil passage. Outputs a control signal to the servo amplifier. The servo valve 91 is controlled by this signal, and the wrinkle pressing force of the intermediate bolster 62 by the hydraulic cylinder device is controlled.

A check valve 94 is incorporated in an oil passage for raising and lowering the piston 81 of the intermediate bolster 62, and a throttle valve 93 with a check is incorporated in the oil passage for rapidly raising the piston 81. The throttle valve with the check valve is used so as not to affect the control performance of the servo valve, but may not be provided depending on the case.

The control of the hydraulic cylinders described above can be performed for each group such as A, B, C, and D as shown in FIG. These groups are determined according to the mold. That is, when a product having a different shape is obtained by drawing, the magnitude of the cushion force can be locally adjusted.

FIG. 8 shows another embodiment of the hydraulic cylinder device provided in the intermediate bolster 62. In the case of FIG. 2, the piston 81 is directly incorporated into a vertical hole formed in the intermediate bolster 62, and the intermediate bolster 62 also serves as a cylinder. On the other hand, in the case of FIG. 8, a vertical hole is formed in the intermediate bolster 62, and the cylinder device itself having the piston 81 and the cylinder 86 is fitted into the hole. The rapid cylinder 82 is incorporated in the center of the piston 81, and there is no difference from the so-called cushion cylinder device shown in FIGS.

FIG. 9 shows another embodiment of the die lifter 8 provided between the upper bolster 61 and the intermediate bolster 62.
In the case of FIG. 2, the structure is such that the die lifter 8 is provided at a position above the piston 81. On the other hand, in the case of FIG. 9, the die lifter 8 is provided at a place where the piston 81 is not provided. In this case, the die lifter 8 is
The structure can be moved up and down by a hydraulic cylinder means provided in the apparatus.

FIGS. 10 and 11 show another embodiment of the bolster 6. The bolster 6 shown in FIG. 1 has a structure that is constantly fixed to the bed 3. 10 and 11
Is a so-called moving bolster. In other words, it is possible to travel on the rail 69 outside the machine body from above the bed 3 of the press machine for mold exchange. The bolster 6 is fixed to a carrier 65, and the carrier 65 is provided with running wheels 66. The wheels 66 are driven by a drive motor 68 and are rotatable.

Referring to FIG. 10, a bolster clamper 67 is provided on the intermediate bolster 62.
At 7, the upper bolster 61 is detachable from the intermediate bolster 62. Thus, the part related to the bolster 6
A bolster clamper may be used instead of the bolt to make it detachable.

Although the present embodiment is directed to a mechanical press machine driven by a crank mechanism,
The present invention can also be applied to other mechanical press machines such as a knuckle mechanism or a hydraulic press machine using a fluid as its driving source.

[0032]

According to the present invention, the bolster has a die cushion built in the bolster according to each embodiment, so that no pit is required, the rigidity of the bed can be increased, and the processing accuracy of the molded product can be increased. The split type is easy to maintain and inspect the die cushion.The hydraulic cylinder device for the die cushion is incorporated in the hole of the intermediate bolster, so the rigidity of the bolster is not impaired. Since the rapid cylinder is incorporated, it operates at a high speed when ascending, and since the plurality of hydraulic cylinder devices can be controlled in groups, it can be seen that there is an effect that the wrinkle holding force can be locally adjusted.

[Brief description of the drawings]

FIG. 1 is a front view

FIG. 2 is a longitudinal sectional view of a bolster.

FIG. 3 is a longitudinal sectional view of a bolster.

FIG. 4 is an explanatory view of mold replacement.

FIG. 5 is an explanatory view of taking out an upper bolster.

FIG. 6 is a circuit diagram.

FIG. 7 is an explanatory diagram of a group.

FIG. 8 is a longitudinal sectional view of a bolster.

FIG. 9 is a longitudinal sectional view of a bolster.

FIG. 10 is a side view of a moving bolster.

FIG. 11 is a top view of a moving bolster.

[Explanation of symbols]

1 is a crown, 2 is a column, 3 is a bed, 4 is a slide, 5 is a position detector, 6 is a bolster, 7 is a mold, 8 is a die lifter, 11 is a crankshaft, 12 is a connecting rod, 31 is a draw-out rail, 32 Is a cylinder, 33 is a piston, 34 is a lock device, 61 is an upper bolster, 62 is an intermediate bolster, 63 is a lower bolster, 65 is a carrier, 6
6 is a wheel, 67 is a bolster clamper, 68 is a drive motor, 69 is a rail, 81 is a piston, 82 is a rapid cylinder, 83 is an oil passage, 84 is an oil passage, 85 is an oil passage, 86 is a cylinder, and 91 is a servo valve. , 92 is a switching valve, 93 is a throttle valve with a check, and 94 is a check valve.

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Claims (9)

[Claims] 1. A drawing apparatus having a die, a blank holder, and a punch for performing drawing forming, wherein a cushion pin is provided below the blank holder, and the cushion pin is supported by a hydraulic cylinder. A press machine with a hydraulic die cushion, wherein a hydraulic cylinder is housed in a bolster. 2. The bolster comprises an upper bolster, an intermediate bolster and a lower bolster, which are detachable from each other. The upper bolster is provided with means for mounting a mold, and a hole for inserting a cushion pin. A press machine with a hydraulic die cushion, wherein a plurality of vertical holes are provided in an intermediate bolster, the hydraulic cylinder device is incorporated in the vertical holes, and an oil passage communicating with the hydraulic cylinder device is provided in the lower bolster. 3. The press machine with a hydraulic die cushion according to claim 2, wherein said plurality of hydraulic cylinder devices are configured to control a hydraulic pressure in response to a command based on a slide stroke. . 4. The apparatus according to claim 2, wherein the plurality of hydraulic cylinder devices are divided into a plurality of groups by a hydraulic circuit, and a hydraulic pressure is controlled for each group. Press machine with hydraulic die cushion. 5. The press machine with a hydraulic die cushion according to claim 2, wherein said hydraulic cylinder device has a rapid cylinder device for raising. 6. A press machine with a hydraulic die cushion according to claim 2, wherein a die lifter is interposed between said upper bolster and said intermediate bolster. 7. A press machine with a hydraulic die cushion according to claim 2, wherein a throttle valve is provided in an oil passage leading to said rapid cylinder. 8. A hydraulic die cushion with a hydraulic die cushion, wherein a rail capable of moving the mold or the upper bolster to the outside of a press machine and having a height adjustable in at least two steps is arranged on a side surface of the press. Press machine. 9. A press machine with a hydraulic die cushion, wherein a groove is formed in a lower surface of the upper bolster, and a hydraulic cylinder for fixing the upper bolster is housed in the intermediate bolster.