JPS6150080B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hydraulic press device.

As conventionally known hydraulic press devices, there are, for example, those shown in FIGS. 1 to 3. In the hydraulic press apparatus shown in FIG. 1, a pressure receiving frame 1 is supported by a pillar 3 between it and a cylinder frame 2, and a movable table 4 is disposed so as to be vertically movable using the pillar 3 as a guide. This movable table 4 is fixed to the upper surface side of the ram 5, and the ram 5
is housed in a pressure chamber 6 formed within the cylinder frame 2 so as to be vertically movable. In addition, 7 is nuts, 8 is packing land, 9 and 10 are work surfaces,
Reference numeral 11 indicates hydraulic supply and discharge passages. Further, in the hydraulic press device shown in FIG. 2, a piston 12 is used in place of the ram 5, and hydraulic supply and discharge passages 13 and 14 for vertical movement of the piston 12 are connected to pressure chambers 15 and 16, respectively. Other parts are substantially the same as those in FIG. 1, and the same parts in the figure are designated by the same reference numerals and redundant explanation will be omitted. In the hydraulic press device shown in FIG. 3, a cylinder 17 supports a movable table 18 instead of the ram 5 and piston 12, and a fixed ram 20 provided on a fixed frame 19 instead of the cylinder frame 2 supports the cylinder 17. It is combined with the pressure chamber 21 inside. A hydraulic supply/discharge path 22 is connected to this pressure chamber 21 . Other parts are substantially the same as those in FIGS. 1 and 2, so the same parts in the figures are designated by the same reference numerals and redundant explanation will be omitted. In such a conventional example, the movable tables 4, 18 are moved up and down by supplying and discharging hydraulic pressure to the pressure chambers 6, 15, 16, 21, and the work surface 9 on the pressure receiving frame 1 side and the movable tables 4, 18 side are moved up and down. Pressing work is performed through molds (not shown) each attached to the work surface 10 of In order to enable this work, both work surfaces (mold mounting surfaces) 9 and 10 must be straight and parallel;
It is an essential condition that the pressure receiving frame 1 and movable tables 4 and 18 be free from deflection, and if these conditions are not satisfied, a situation will occur in which the upper and lower molds cannot be brought into close contact with each other, resulting in the production of defective products.
Among these conditions, straightness and parallelism are determined to appropriate values at the manufacturing stage of the device, but deflection depends on the rigidity of the pressure receiving frame 1 and movable tables 4, 18, the force transmission method, in other words, the essence of the device. There are problems that occur to a greater or lesser degree depending on the mechanism and design standards.

The present invention has been made by focusing on such conventional problems.A pressure chamber is formed in at least one of the pressure receiving frame and the movable table in a size corresponding to the work surface, and this pressure chamber is filled with oil for driving the movable table. By applying pressure, even if the pressure-receiving frame and movable table are deflected to a greater or lesser extent, by transmitting force evenly over the entire surface of the mold, both the upper and lower molds can be brought into close contact, thereby solving the problems of the past. That is. Specifically, the hydraulic press device according to the present invention has a configuration in which a pressure chamber of a size corresponding to the work surface is formed in at least one of the pressure receiving frame and the movable table, and the pressure chamber for driving the movable table is communicated with the pressure chamber. belongs to.

The details will be explained below based on FIGS. 4 to 6. In the following description, the same reference numerals will be used for parts that are the same as or similar to those in the prior art, and redundant explanation will be omitted.

FIG. 4 is a diagram showing a first embodiment of the present invention.
A first pressure chamber 30 is formed inside the pressure receiving frame 1, and a second pressure chamber 31 is formed inside the movable table 4, with an area corresponding to the width of each work surface 9, 10. The ram 5 has a hollow shape, and the third pressure chamber 33 for driving the movable table 4 and the above-mentioned second pressure chamber 31 are in communication via the hollow chamber 32, and the third pressure chamber 33 and the above-mentioned second pressure chamber 31 are in communication with each other. First pressure chamber 30
are in communication via a common hydraulic path 37.

Next, to explain the action, from a hydraulic source (not shown),
The supplied hydraulic pressure is applied to the third pressure chamber 33 and the hollow chamber 32.
Also, the second pressure chamber 31 is filled with movable table 4.
At the same time, the same hydraulic pressure is supplied to the first pressure chamber 30 via the hydraulic path 34, and the first working surface 9 and the second working surface 10 are driven upward.
Force is transmitted from the first pressure chamber 30 and the second pressure chamber 31 to the entirety of both work surfaces 9 and 10, respectively.
The force is transmitted to the entire surface of both the upper and lower dies (not shown) attached to the dies, and the dies are brought into close contact with each other. Since the pressing process is always performed in such a state, even if the pressure receiving frame 1 and the movable table 4 are bent, the bending is, so to speak, canceled out.

FIG. 5 is a diagram showing a second embodiment of the present invention.
This embodiment is similar to the first embodiment in that a first pressure chamber 35 is formed inside the pressure receiving frame 1 and a second pressure chamber 36 is formed inside the movable table 4, but the movable table 4 Piston 1 instead of ram 5
The second pressure chamber 36 and the third pressure chamber 38 for driving the movable table 4 are communicated with each other via the hollow chamber 37 of the piston 12. The first pressure chamber 35 is connected to the first pressure chamber 35 via a common hydraulic path 39 . Note that the third pressure chamber 38 moves forward (raises) the movable table 4.
Another fourth pressure chamber 40 is also provided within the cylinder frame 2 for driving the engine and for retracting (downward) driving.

Next, the effect will be explained. Hydraulic pressure supplied from a hydraulic source (not shown) fills the third pressure chamber 38, the hollow chamber 37, and the second pressure chamber 36, and drives the movable table 4 upward. At this time, the same applies to the first pressure chamber 35. Since pressure is supplied through the hydraulic path 39, force is uniformly transmitted from both the first and second pressure chambers 35, 36 to the entire first and second work surfaces 9, 10 during hydraulic press work. , which transmits force to the entire surface of both upper and lower dies (not shown) attached to both work surfaces 9 and 10, bringing the dies into close contact with each other, and even if some deflection occurs, it is canceled out. It's something you end up doing.

FIG. 6 is a diagram showing a third embodiment of the present invention.
In this embodiment, as in the first and second embodiments, a first pressure chamber 41 is formed in the pressure receiving frame 1, and a second pressure chamber 42 is formed in the movable table 18.
However, unlike the first and second embodiments, the movable table 18 is supported by a cylinder 17.
A fixed ram 20 is combined with a third pressure chamber 43 in the second pressure chamber 4.
2 are connected, and the third pressure chamber 43 and the first pressure chamber 41 are connected via a common hydraulic path 44.

To explain the operation, when hydraulic pressure is supplied to the third pressure chamber 43 from a hydraulic source (not shown), the third pressure chamber 43 and the second pressure chamber 42 are filled with hydraulic pressure, and at the same time, the hydraulic pressure is supplied to the first pressure chamber 43 through the hydraulic path 44. Since the pressure chamber 41 is also filled and a force is exerted on the entire first and second working surfaces 9 and 10,
The movable table 18 has both the third and second pressure chambers 43,
When it moves forward (raises) in response to the hydraulic pressure supplied to 42, force is transmitted to the entire surface of both the upper and lower dies (not shown) attached to both work surfaces 9 and 10, forcing the dies to come into close contact with each other. Pressure receiving frame 1 and movable table 1
Even if flexure occurs on both sides of 8, it cancels it out.

In addition, in each of the above first, second, and third embodiments,
Both the pressure receiving frame 1 and the movable tables 4, 18 are provided with pressure chambers 30, 31, 35, 36, 41, 4 of a size corresponding to the size of the work surfaces 9, 10, respectively.
2 has been described, but the present invention is not limited to this, and as long as a "pressure chamber" is formed in at least one of the pressure receiving frame 1 and the movable tables 4 and 18, the original purpose can be achieved. be able to. or,
It is free to make the size of the pressure chambers 30, 31, 35, 36, 41, 42 larger than the size of the working surfaces 9, 10.

As described above, according to the present invention, a pressure chamber of a size corresponding to the work surface is formed in at least one of the pressure receiving frame and the movable table, and the pressure chamber is communicated with the pressure chamber for driving the movable table. In the case of molding work where molds are brought into close contact, the force is transmitted uniformly to the entire work surface of the pressure receiving frame and movable table, and the force is equally transmitted to the entire surface of the mold attached there.
This makes it possible to forcibly bring the molds into close contact with each other, and even if there is some deflection in the pressure receiving frame or movable table, it has the excellent effect of being able to cancel that out and bring the upper and lower molds into close contact. In addition to these effects, there is also the effect that even if the device has defects in straightness or parallelism during the manufacturing stage, it can partially cancel out the defects.

[Brief explanation of the drawing]

FIGS. 1 to 3 are side views showing a conventional example of a hydraulic press device, with main parts broken, and FIGS. 4 to 6.
Each of the figures is a side view of a broken main part corresponding to FIGS. 1 to 3 showing an embodiment of the present invention. 1... Pressure receiving frame, 2... Cylinder frame, 4, 18... Movable table, 5... Ram,
6, 15, 16, 21... pressure chamber, 9, 10...
work surface, 12... piston, 17... cylinder,
30, 35, 41...first pressure chamber, 31, 36,
42...Second pressure chamber, 33, 38, 43...Third
Pressure chamber, 34, 39, 44...hydraulic path.

Claims (1)

[Claims] 1. A hydraulic press device in which a pressure chamber of a size corresponding to the work surface is formed in at least one of a pressure receiving frame and a movable table, and the pressure chamber for driving the movable table is communicated with the pressure chamber.