JPS6161918B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical field This invention provides an independent pressure equalizing chamber filled with liquid in at least one of the pressure receiving frame and the movable table of a pressure equalizing press device, and the working surface part is floating. The present invention relates to a pressure equalizing press device that supports a plate-shaped state.

(b) Prior Art and its Problems Taking conventionally known hydraulic press devices as an example, there are those shown in FIGS. 1 to 4, 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. The movable table 4 is fixed to the upper surface 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 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 . Other parts are 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 pressure chambers 6, 15, 16, 21
The movable tables 4 and 18 are moved up and down by supplying and discharging hydraulic pressure to the upper and lower molds 23 and 24 respectively attached to the work surface section 9 on the pressure receiving frame 1 side and the work surface section 10 on the movable tables 4 and 16 side. For example, as shown in Fig. 4, the press work is performed with high precision, especially the upper and lower molds 2.
3 and 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 follow the deformation of the pressure receiving frame 1. When the movable table 4 is bent [the amount of deflection is indicated by δ in the figure]
A similar deflection occurs, and as a result, it is necessary that both working surfaces 9 and 10 are kept parallel, that is, dynamically parallel. [Here, dynamic parallelism means
It refers to being parallel in a dynamic state during work. ]
If this condition is not satisfied, a situation occurs in which the upper and lower molds 23 and 24 cannot be brought into close contact with each other 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.

Therefore, the present applicant has focused on these conventional problems, and has developed an equalizer that specifically corrects the deflection of the movable table and also makes it easy to obtain dynamic parallelism between the working surfaces of the pressure receiving frame and the movable table. A pressure press device was proposed earlier.

The "equal pressure press device" proposed by the present applicant is as shown in FIGS. A pressure equalization chamber 32 is formed. That is, the movable table 31 is mainly divided into a work table 33 and a movable table main body 34, and a pressure equalization chamber 32 filled with liquid according to the size of the work surface 10 is provided between the two. Due to the presence of the work table 33, the work table 33 is made into a floating plate.

The pressure equalization chamber 32 is a space separated from the outside world, provided between the work table 33 and the movable table main body 34 according to the size of the work surface section 10, and has a height h.
may be about several mm, and oil is sealed inside as a liquid at zero pressure. When the hydraulic press device 30 is used as a "heat press", the molds 23 and 24 are heated up, so a heat-resistant oil is used as the sealed oil.

This pressure equalizing 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 pressure equalization 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. The height (h) of the pressure equalization chamber 32 depends on the capacity of the press or the work table 33.
It goes without saying that oil pressurized with an appropriate pressure may be sealed therein, which is determined as appropriate depending on the thickness of the tube.

The movable table main body 34 is connected to the work table 33 which is made into a floating plate via the pressure equalization 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 disc 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 addition, 39 in the figure is a parting line, which indicates the boundary where the work table 33 and the movable table main body 34 are joined.
Regardless of the expansion of the oil in 2, the two will be reliably connected. Also, movable table body 34
A bolt hole 40 is provided near the piston 12 attachment site, a ring 41 is fitted therein, and a bolt 42 is attached from the movable table main body 34 side to the work table 33 side, whereby both the upper and lower molds 2
The mold release force when the parts 3 and 24 are separated is transmitted from the movable table body 34 to the bolt 42 to the work table 33. In addition, 43 is a plug and bolt hole 40
is crowned.

On the upper surface of the work table 33, that is, on the work surface portion 10, the upper mold 24 is attached with a washer 44 and a lower mold mounting bolt 45.
The working table 33 is fixed at a position where it can be accurately aligned with the upper mold 23 on the pressure receiving frame 1 side, and the work table 33 is further provided with an oil sealing port 46 for introducing oil into the pressure equalizing chamber 32. 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 addition, in order to prevent leakage of the oil sealed in the pressure equalization chamber 32, the sealing member 35 is attached to the movable table main body 34.
A mating part 36 with a step between and the work table 33
and further arranged around the through tube 47.

According to the pressure equalizing press device (hydraulic press device) 30 shown in FIGS. 5 and 6, the movable table 31 is driven upward by hydraulic pressure supplied from a hydraulic source (not shown), and the upper and lower molds 23, 24, the pressure applied from the pressurizing means to the lower die 24 via the movable table 31 becomes a reaction force when the lower die 24 comes into contact with the upper die 23. While acting on the lower mold 24, the reaction force is automatically transferred to the work table 3 via the oil inside the pressure equalization chamber 32.
3 in the vertical direction, so that the working table 33 is supported by a perfectly evenly distributed hydraulic pressure inside the pressure equalization 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 elastic body. Therefore, the fact that this single elastic body is directly subjected to a completely evenly distributed load by the hydraulic pressure means that the highest possible pressure equalization state is achieved. When the movable table main body 34 tries to bend further, the bolt 37 is combined with the disc spring 38, so the work table 33 moves independently of the movable table main body 34 at 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 pressure equalization 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 bolts 42. At this time, 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. 7 is a diagram showing another example in contrast to the examples shown in FIGS. 5 and 6, in which a pressure equalizing chamber 55 is provided independently within the pressure receiving frame 1 with an area corresponding to the width of the work surface section 9. A working surface portion 9 formed on the surface and having liquid sealed therein is supported in a floating plate state. Therefore, if the pressure receiving frame 1 is deflected, the liquid in the pressure equalizing chamber 55, such as oil, provides dynamic parallelism to the work surface section 9 as in the previous example.

Note that either one of the pressure equalization chamber 32 on the movable table 31 side and the pressure equalization chamber 53 on the pressure receiving frame 1 side may be employed, and it is also free to use both pressure equalization chambers 32 and 55.

As explained above, in the pressure equalizing press device according to the previous proposal, the work surface is supported through the pressure equalizing chamber filled with liquid, so this work surface is supported as a so-called floating plate, and as a result, the mold and The deflection of the work surface that supports the mold can be corrected by equalizing the pressure, and the dynamic parallelism of both the pressure receiving frame and movable table can be ensured, and the press capacity can be improved accordingly. This is something to look forward to.

However, when the pressure equalization chamber shown in the previous proposal is formed as one pressure equalization chamber for the work surface as in the example shown in Fig. 6, the plane size of the pressure equalization chamber may vary depending on the plane size of the work surface. Since they tend to be relatively large and require large processing sizes, a pressure equalization chamber that is easy to process is desired.

(C) Purpose of the Invention This invention aims to improve the pressure equalization press device proposed earlier by the applicant, and is intended to support one work surface part in one pressure equalization chamber. Instead, we support a single work surface with multiple pressure equalization chambers, which enables more efficient correction of deflection, and at the same time provides a pressure equalization press device that makes it easy to process the pressure equalization chambers. There it is.

(d) Structure of the Invention In order to achieve the above object, the pressure equalizing press device according to the present invention has a structure in which liquid is sealed in at least one of a pressure receiving frame provided with an upper mold and a movable table provided with a lower mold. A pressure equalizing press device that forms a pressure equalizing chamber and supports a work surface portion for mounting a mold through this pressure equalizing chamber, wherein the pressure equalizing chambers are formed independently in a plane direction, and each of the pressure equalizing chambers is The pressure equalization chambers are communicated through passages.

(E) Embodiments The present invention will be described below with reference to FIGS. 8 to 11. In the following, parts that are the same as or similar to those in the previous proposal will be denoted by the same reference numerals, and repeated explanations and illustrations will be omitted.

FIG. 8 and FIG. 9 are diagrams showing a first embodiment of the present invention. In the illustrated example, this "pressure equalization press apparatus" is shown as a hydraulic press apparatus 30, and four pressure equalization chambers 61a, 61b, 61c, and 61d are independently arranged in a plane direction on a movable table 60 of this hydraulic press apparatus 30. and each pressure equalization chamber 61a, 61
b, 61c, and 61d are communicated via a passage 62. That is, the work table 63 and the movable table main body 64 that constitute the movable table 60 are divided, as in the technique related to the previous proposal, and a "pressure equalization chamber" is formed between them, but in this invention, a plurality of pressure equalization chambers are formed. A work table 63 is supported via 61a, 61b, 61c, and 61d to form a floating plate.

More specifically, the upper surface 65 of the movable table main body 64 has four recesses 66 having the same shape in the plane direction.
The lower surface 67 of the work table 63 has protrusions 68 of the same size and shape that can fit into the recesses 66, corresponding to the four recesses 66. As shown in FIG. 8, the concave portion 66 and the convex portion 68 may be combined to form the pressure equalizing chambers 61a, 61b, 61c, and 61d inside the concave portion 66. For this reason, the work table 63 is assembled with a space of height (h) left inside the recess 66, and as a result, pressure equalization chambers 61a, 61b, 61
c, 61d are formed and the work table 63
The lower surface portion 67 is the upper surface portion 6 of the movable table main body 64.
5 through a gap of size (α). An O-ring 69 is provided around the convex portion 68, and the pressure equalizing chambers 61a, 61b, 61
It is designed to seal the liquid sealed in the cylinders c and 61d. Further, the passage 62 communicates between the pressure equalization chambers 61a, 61b, 61c, and 61d as shown in FIG.
The liquid sealed in chambers 61c and 61d can communicate with each other, and the pressure equalizing chambers 61a and 61b are connected to the liquid sealing port 70 via another passage 71.

Next, the effect will be explained.

When the movable table 60 is driven by hydraulic pressure supplied from a hydraulic source (not shown) and press work is performed via the upper and lower molds 23 and 24, the pressure applied to the lower mold 24 is When it comes into contact with the mold 23, it acts as a reaction force on the lower mold 24, and the reaction force is automatically applied to the four pressure equalizing chambers 61a, 61b,
It acts vertically on the work table 63 via the sealed liquid in the pressure chambers 61c and 61d, which means that the work table 63 has four pressure equalization chambers 61a and 61d.
This means that they are supported by perfectly evenly distributed hydraulic pressure inside 1b, 61c, and 61d. Now, if we consider the work table 63 as a "floating plate" and a part of the lower mold 24, under equilibrium conditions, the lower mold 24 and the work table 63 (floating plate) constitute one elastic body. In this way, one elastic body fills each of the four pressure equalizing chambers 61a, 61b, 61c, and 61d.
The direct and completely evenly distributed loading by the hydraulic pressure within the cylinder means that the highest possible pressure equalization is achieved.

The work table 63 follows the bending of the pressurized and deformed mold, but the following range is regulated within the range of the dimension (α) between the upper and lower surfaces 65 and 67, and the work table 63 follows the bending of the mold that is being deformed under pressure. It is intended to continue applying various loads. In addition, in the unlikely event that each pressure equalization chamber 61a,
When the sealed liquid in 61b, 61c, and 61d leaks, the lower surface part 67 is supported by the upper surface part 65, and this supported state excludes the convex part 68 of the work table 63 and the concave part 66 of the movable table main body 64. , the working table 63 and the movable table main body 64 are joined together by the upper and lower surfaces 65 and 67, thereby preventing excessive deformation of the working table 63.

By the way, the four pressure equalization chambers 61a, 61b, 61
c and 61d are made to correspond to the size of the work table 63 divided into four equal parts in terms of its plane size,
Therefore, even if the width size (L) of the work table 63 is considerably large, the pressure equalization chambers 61a, 61b, 61c,
The width size (l) of 61d is "L/2>l", so for machine tools that have a limit on machining length, it is sufficient to process only the width size (l) instead of the width size (L). It is easy to process, and conversely, the maximum machining length of the target machine tool is (l)
If this is the case, the pressure equalization chambers 61a, 61b, 61 can be extended up to the large-sized work table 63 with twice the size of 2l.
c, 61d can be easily processed.

The other configurations and operations are substantially the same as those described above based on the proposed FIGS. 5 to 7, and redundant explanation will be omitted. In FIGS. 8 and 9, only the structure of the movable table 60 is shown and the rest is omitted, and detailed parts in the movable table 60, such as bolts 37 and disc springs 38 (see FIG. 6), are not shown. is also omitted.

FIG. 10 and FIG. 11 are diagrams showing a second embodiment. In the first embodiment with reference to FIGS. 8 and 9, the "pressure equalization chambers" are four square pressure equalization chambers 61a, 6
1b, 61c, and 61d, in this embodiment, a large number of 25 pressure equalizing chambers 80 are independently formed between the work table 82 of the movable table 81 and the movable table main body 83, Each pressure equalization chamber 80 is in communication via a passage 84.

According to this embodiment, a large number of pressure equalization chambers 80
The work table 82 can be supported as a floating plate, and deflection can be corrected very efficiently.
Each of the recesses 86 can be easily formed by machining a small cylindrical shape and machining a small round hole. Note that even a small machine tool can sufficiently process the hole, especially when making a small round hole.

Other configurations and operations are substantially the same as those of the previous embodiment, so the same parts in the drawings are denoted by the same reference numerals and redundant explanation will be omitted.

By the way, in the first embodiment, there are four rectangular pressure equalizing chambers 61a, 61b, 61c, and 61d, and a second
Although the example shows an example in which 25 circular pressure equalization chambers 80 are formed on the movable tables 60, 81, the shape, size, number, etc. of the "pressure equalization chambers" are not limited to these. In short, if a plurality of independent "pressure equalization chambers" are formed in at least one of the pressure receiving frame and the movable table in the plane direction and communicated with each other through passages, the conditions of the present invention are satisfied. It is.

(F) Effects of the Invention Since the pressure equalization press device according to the present invention has the content as explained above, the effect of the pressure equalization press device proposed earlier, that is, the pressure equalization chamber supports the work surface part by making it into a floating plate. Since the mold and the work surface that supports it are corrected for deflection by equalizing the pressure, dynamic parallelism of both the work surfaces of both the pressure receiving frame and the movable table can be reliably obtained, increasing the capacity of the press. Moreover, since the pressure equalization chamber only takes up a small space and is completely independent from the outside, the amount of liquid, such as oil, sealed therein can be extremely small. Internal pressure is automatically generated according to the driving pressure of the press, so no special pressure source is required.
In addition to the above-mentioned effects, the following effects can be expected in addition to the effect that the work surface can be supported by the bolt with the disc spring regardless of the expansion of the liquid.

[A] Since multiple pressure equalization chambers are formed, the target part (for example, the work table and the lower mold attached thereto) is affected by the hydraulic pressure of the liquid sealed in each pressure equalization chamber.
As a single elastic body, it is directly subjected to a completely evenly distributed load, and this pressure equalization allows for efficient correction of deflection. , the above [A] can be fully expected, and it is easy to fill the entire pressure equalization chamber with liquid, and [C] a small pressure equalization chamber is formed on a large target surface, such as a work table. It is easy to process with machine tools,
The larger the size of the target surface, the more beneficial it is.

Furthermore, according to the embodiment, [D] the range in which the work plate follows the "bending of the lower mold" can be restricted to within the dimension (α) between the lower surface of the work plate and the upper surface of the movable plate main body. Even if the sealed liquid leaks from the pressure equalization chamber, excessive deformation of the work plate can be prevented [Figures 9 and 10], [E] The pressure equalization chamber can be formed by machining a small round hole. Therefore, the pressure equalizing chamber can be easily and sufficiently machined using a small machine tool (Figs. 10 and 11).

[Brief explanation of the drawing]

FIGS. 1 to 3 are side views with main parts broken, showing conventional examples of hydraulic press devices as pressure equalizing press devices, and FIG. 4 is a side view equivalent to FIG. 2 showing a state where deflection has occurred. , FIGS. 5 to 7 show the pressure equalization press device according to the earlier application; FIG. 5 is a side view corresponding to FIG. 2 of the hydraulic press device as the pressure equalization press device; FIG. 6 is a side view of the hydraulic press device as the pressure equalization press device; is an enlarged sectional view of the movable table shown in FIG. 5, FIG. 7 is a side view corresponding to FIG. 5 showing another example, and FIGS. 8 is an enlarged sectional view corresponding to FIG. 6 showing the first embodiment of the present invention, FIG. 9 is a plan view of the movable table shown in FIG. 8, and FIG. 10 is an enlarged sectional view corresponding to FIG. FIG. 11 is an enlarged sectional view corresponding to FIG. 8 showing the second embodiment, and FIG. 11 is a plan view corresponding to FIG. 9 of the movable table shown in FIG. 10. 1...Pressure receiving frame, 4, 31, 60, 81...
...Movable table, 9, 10...Work surface section, 23,
24... Mold, 32, 55, 80, 61a, 61
b, 61c, 61d...... pressure equalization chamber, 62, 71,
84...Aisle, 64, 83...Movable table body.

Claims (1)

[Scope of Claims] 1. A pressure equalizing chamber filled with liquid is formed in at least one of a pressure receiving frame provided with an upper mold and a movable table provided with a lower mold, and a pressure equalizing chamber filled with liquid is provided through the pressure equalizing chamber for installing the mold. A pressure equalizing press device that supports a work surface portion, wherein the pressure equalizing chambers are formed independently in a plane direction, and each pressure equalizing chamber is communicated with each other through a passage.