JPH0413080B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention provides an independent chamber containing a liquid in at least one of the pressure receiving frame and the movable table of a press device, so that the work surface can be filled with liquid. The present invention relates to an improvement of a press device in which a holding plate is supported.

(b) Prior Art and its Problems As an example of conventionally known hydraulic press devices, there are those shown in FIGS. 5 to 8, for example. In the hydraulic press device shown in Fig. 1, 1 is a pressure receiving frame, and a column 3
A movable table 4 is supported by the pillar 3 and is movable up and down 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 in the cylinder frame 2 so as to be able to freely move up and down. In addition, 7 is a nut, 8 is a packing gland, 9 and 10 are working surface parts, and 11 is a hydraulic supply/discharge path, respectively. 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 . For other information, please refer to Section 5.
8 and 8, 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 working surface portion 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 both upper and lower molds 23 and 24, which are respectively attached to the working surface portion 10. For example, as shown in FIG.
24 (for example, molding work), it is necessary to apply a load to both the upper and lower molds 23 and 24 and cause the upper mold 23 to bend in accordance with the deformation of the pressure receiving frame 1. In this case, [the amount of deflection is indicated by δ in the figure] the movable table 4 also causes a similar deflection, and as a result, both work surfaces 9 and 10 must be kept parallel, that is, dynamically parallel. It is. [Note that dynamic parallelism here refers to being parallel in a dynamic state during work. ] If this condition is not satisfied, a situation will occur in which the upper and lower molds 23 and 24 cannot be brought into close contact with uniform pressure, resulting in the production of defective products. The deflection δ inevitably occurs depending on the rigidity of the pressure receiving frame 1 and the movable tables 4 and 18, the force transmission method, or in other words, the essential mechanism and design criteria of the device.

(c) Problems to be Solved by the Invention Therefore, the present applicant focused on these conventional problems, and in particular corrected the deflection of the movable table and further improved the dynamic parallelism of the working surfaces of the pressure receiving frame and the movable table. He previously proposed a pressure equalizing press device that made it easy to obtain [Patent Application No. 58-151697].

The configuration of the press device related to the future proposal is as follows:
forming a liquid-filled chamber with a size approximately corresponding to the planar size of the work surface for mounting the mold in at least one of the pressure receiving frame provided with the upper mold and the movable table provided with the lower mold; During this time, the working surface part is supported through the liquid sealed in the inter-chamber, and the pressure-receiving frame or the movable table provided with the inter-chamber is integrated with the working surface part by means of bolts with disc springs.

This press device proposed earlier has sufficiently solved the problems of conventional press devices (especially hydraulic press devices), but in order to make this press device easier to use in hot conditions, it is necessary to introduce liquid into the chamber. It was hoped that further improvements would be made regarding the conditions under which it should be added.

Therefore, while conducting various experiments, the present applicant obtained the knowledge that the thermal expansion of the liquid (for example, oil) introduced into the chamber could be absorbed or canceled out by some method, and this invention was created. It is something.

(d) Means for Solving the Problems And the press device according to the present invention allows at least one of the pressure receiving frame provided with the upper mold and the movable table provided with the lower mold to be attached to the main body and the mold. A chamber is formed between the main body and the work table, and has a space approximately corresponding to the planar size of the work surface for mounting the mold, and has a liquid sealed inside. In a press machine in which the work table is supported as a floating plate by the liquid sealed in the chamber, and the main body and the work table are integrated with a bolt with a disc spring, the above-mentioned chamber is In addition to liquid, gas is sealed in a volume ratio determined depending on the temperature conditions used.

(E) Effect When this press device is used in a hot state, the liquid placed in the chamber will thermally expand, but the amount of this liquid must be adjusted in advance to a certain ratio smaller than the volume of the chamber. Moreover, the remaining volume is in the form of gas, so if you mix oil as a "liquid" and air as a "gas" at a ratio of 90:10, the thermal expansion of the oil will be the same as that of the air and the bolt. The pressure is absorbed and canceled by the attached disc spring, allowing the press operation to continue without affecting the pressure equalization function.

(f) Examples The present invention will be explained below based on the drawings. In the following, the same reference numerals will be used for parts that are the same as or similar to those of the prior art, and redundant explanation will be omitted.

FIGS. 1 and 3 are diagrams showing one embodiment of the present invention, taking a hydraulic press device as an example.

In a hydraulic press device 30 serving as this press device, a chamber 32 is formed within a movable table 31. That is, the movable table 31 mainly consists of a work table 33 and a "main body", that is, a movable table main body 34.
Between the two, a chamber 32 having a size approximately corresponding to the plane size of the work surface section 10 and containing a liquid is provided, and a chamber 32 is provided between the two.
2, the work table 33 is made into a floating plate.

The chamber 32 is a space that is provided between the work table 33 and the movable table main body 34 in a size approximately corresponding to the planar size of the work surface section 10 and is made independent from the outside world, and the height h may be approximately several mm. Inside, there is oil as a ``liquid'' and air as a ``gas.'' When the hydraulic press device 30 is used as a "heat press", the molds 23 and 24
Since the oil will be heated up, a heat-resistant oil will be used as the oil.

Furthermore, taking oil thermal expansion into consideration in advance, during this time
Approximately 90% of the volume of the chamber 32 is filled with oil, and the remaining 10% is filled with air as "gas." Note that this ratio of oil and gas varies depending on conditions such as the temperature applied to the mold and the heating rate, and the ratio of 90:10 is an example when used at around 185°C. At about 175°C, the ratio becomes, for example, about 94:6, and furthermore, at about 170°C, the ratio becomes about 97:3.

During this time, the chamber 32 is independent and sealed from the pressure chambers 15 and 16 formed in the cylinder frame 2. Therefore, as mentioned above, even when used as a "heat press", the pressure chamber 15 is separate from the intermediate chamber 32, and the lower mold 2 is heated up.
4, the oil supplied to and discharged from the pressure chamber 15 does not require any special cooling. Of course, the volume of the press chamber 32 is determined as appropriate depending on the press capacity or the thickness of the work table 33.

The movable table main body 34 is connected to a working table 33 which is made into a floating plate via the intermediate chamber 32.
The movable table main body 34 itself is fixed to the upper surface side of a pressurizing/driving means (piston 12 in the illustrated example).

A bolt 37 is screwed together with a disk spring 38 from the lower surface side of the movable table main body 34 to the work table 33 side, thereby integrating the two.
In the figure, numeral 39 is a parting line, which indicates the boundary where the work table 33 and the movable table main body 34 are joined, and the bolts 37 and disc springs 38 ensure that the two are connected.

By the way, the bolt 37 with the disc spring 38 not only integrates the work table 33 and the movable table main body 34, but also connects the disc spring 38 to the chamber 3.
In this embodiment, as shown in Fig. 3, in order to fully demonstrate this function, the 8 in this embodiment supports the expansion of the oil in 2 and also receives the table pulling force of the press. Disc springs 38 are combined with each other using bolts 37.

Further, a bolt hole 40 is provided in the movable table body 34 near the piston 12 attachment site, a ring 41 is fitted therein, and a bolt 42 is attached from the movable table body 34 side to the work table 33 side.
As a result, the mold release force when the upper and lower molds 23 and 24 are separated is transmitted from the movable table body 34 to the bolt 42 to the work table 33. Nao 4
3 seals the bolt hole 40 with a plug.

The lower mold 24 is attached to the upper surface of the work table 33, that is, the work surface portion 10, and the washer 44 and the lower mold mounting bolt 45 are attached to the lower mold 24.
The work table 33 is fixed at a position where the upper mold 23 on the pressure receiving frame 1 side can be accurately matched with the upper mold 23 by means of the above. It is being The shape of the work table 33 is free, but the shape of the lower mold 2
There are many square shapes that match 4. Also, movable table body 3
4 and the work table 33, a through tube 47 is fitted therein, and a through hole 49 for an ejector rod 48 is formed therein.

In order to prevent oil and air contained in the intermediary chamber 32 from leaking, a sealing member 35 is disposed at the stepped joint 36 between the movable table main body 34 and the work table 33, and also around the through passage 47. has been done.

Next, to explain the operation, when the movable table 31 is driven upward by hydraulic pressure supplied from a hydraulic power source (not shown) and press work is performed via the upper and lower molds 23 and 24, the movable table 31 is moved from the pressurizing means. The internal pressure applied to the lower mold 24 through the lower mold 24 acts as a reaction force on the lower mold 24 when the lower mold 24 comes into contact with the upper mold 23, and the reaction force is automatically applied to the lower mold 24. The working table 33 is acted upon in the vertical direction via the oil inside the chamber 32, so that the working table 33 is supported by a perfectly evenly distributed hydraulic pressure inside the chamber 32. Now, if we consider the work table 33 as a floating plate and part of the lower mold 24, under equilibrium conditions, the lower mold 24 + the work table 33 [floating plate] constitute one composite elastic body. Therefore, the fact that this one composite elastic body is directly subjected to a completely uniformly distributed load by the hydraulic pressure means that the highest possible pressure equalization state is achieved. Then, when the work table 33 tries to bend further, since the bolt 37 is combined with the disc spring 38, the work table 33 is moved to the parting line 39 within the allowable amount of the disc spring 38.
The floating plate deforms so as to continue to apply a uniform load to the mold while following the deformation of the pressurized mold. This means that even if the oil in the chamber 32 expands, the disc spring 38 absorbs the amount of displacement of the work table 33 due to the expansion.

After pressing, the movable table body 34 is moved from the pressurizing means to release the lower mold 24 from the upper mold 23.
The mold release force applied is transmitted to the work table 33 and the lower mold 24 via the bolt 42. At this time, since the disc spring 38 is receiving the table pulling force, the movable table main body 34 and the work table 33 are in close contact with each other at the parting line 39, and are pulled down together.

When the movable table 31 is lowered, the ejector rod 48 enters the lower mold 24 through the through hole 49, facilitating the ejection of the product from the lower mold 24.

FIG. 4 is a diagram showing a second embodiment of the invention. In this embodiment, a chamber 55 is independently formed inside the pressure receiving frame 1 with an area corresponding to the width of the work surface section 9, and liquid is introduced therein together with air to form the work surface section 9 into a floating plate. Supported by the state. Therefore, if the pressure-receiving frame 1 is bent, the liquid in the interspace 55, such as oil, provides dynamic parallelism to the working surface 9, as in the previous embodiment.

The use of a bolt 37 with a disc spring 38 and other configurations and functions are the same as in the previous embodiment, and therefore a description thereof will be omitted.

Note that either one of the interspace chamber 32 on the movable table 31 side and the interspace chamber 55 on the pressure receiving frame 1 side may be employed, and it is also free to use both intermediary chambers 32 and 55.

(G) Effects of the Invention The press device according to the present invention has the contents as explained above, and therefore has the various effects of the press device previously proposed by the applicant, namely, the space between the work surface and the floating plate. Since the mold and the work surface that supports it correct the deflection by equalizing the pressure, it is possible to ensure dynamic parallelism of both work surfaces for both the pressure receiving frame and the movable table. In addition, since the chamber only takes up a small amount of space and is completely independent from the outside, the amount of liquid, such as oil, that can be put into it is also extremely small. Since the internal pressure of the press is automatically generated according to the driving pressure of the press, there is no need for a special pressure source. Even if the liquid in the chamber expands thermally, the expansion will be absorbed and canceled by the presence of gas and the disc spring, which have been introduced into the chamber for about 10% of its volume. It has the excellent effect of allowing press work to continue without affecting the pressure equalization function even if thermal expansion occurs.

[Brief explanation of drawings]

FIG. 1 is a side view of a hydraulic press device as a press device showing one embodiment of the present invention, and FIG.
FIG. 3 is a bottom view of the movable table main body seen from the direction of the arrow in FIG. 2, and FIG. 4 is equivalent to FIG. 1 showing another embodiment of the present invention. , and FIGS. 5 to 7 are side views with main parts broken, showing conventional examples of a hydraulic press device as a press device, and FIG. 8 is a side view corresponding to FIG. 6 showing a state where deflection has occurred. FIG. 1... Pressure receiving frame, 2... Cylinder frame, 4, 18, 31... Movable table, 5... Ram, 6, 15, 16, 21... Pressure chamber, 9, 10
... Working surface section, 11, 13, 14, 22 ... Supply and exhaust passage, 12 ... Piston, 17 ... Cylinder, 1
9...Fixed frame, 20...Fixed ram, 23...
... Upper mold, 24 ... Lower mold, 30 ... Hydraulic press device, 32, 55 ... Intermediate chamber, 33 ... Work table, 34 ... Movable table main body, 36 ... Joining part, 37, 42 ...Bolt, 38...Disc spring,
41...Ring, 43...Plug, 44...Washer, 45...Lower die mounting bolt, 46...Oil filling port.

Claims (1)

[Scope of Claims] 1. At least one of a pressure receiving frame provided with an upper mold and a movable table provided with a lower mold is formed by a main body and a work table for attaching the mold, and the main body and the work table are A chamber is formed between the chamber and the chamber, which has a size approximately corresponding to the flat size of the work surface for mounting the mold, and a liquid is sealed inside. In a press machine that is supported by a floating plate and that integrates the main body and work table with bolts with disc springs, the above-mentioned chamber contains, in addition to the liquid, a A press device characterized by enclosing gas at a volume ratio determined according to the requirements.