JPH02133134A - Forming device - Google Patents

Abstract

PURPOSE:To prevent blocking force from being given excessively and to reduce a slide stroke by supporting a punch by one side of a piston member placed on the inside of a ring member, and positioning the other end of the piston member in a cylinder chamber formed in a holder. CONSTITUTION:A piston member 75 is placed on the inside of a ring member 67, the lower punch 69 is supported by one side of this piston member 75, and also, the other side of the piston member 75 is positioned in a cylinder chamber 85 formed in the lower holder 71. Accordingly, when the lower die 55 moves to the lower part, the lower punch 69 moves to the upper part, and blocking force is also generated in accordance with a load of the lower punch 69, therefore, is does not occur that the blocking force is generated excessively, and a slide stroke required for forming can also be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention applies to a forming apparatus used for closed forging, etc. [Prior Art] Generally, at least one of a pair of dies arranged opposite to each other is provided with a punch. A closed forming method in which the material is deformed by inserting the punch and giving relative movement to the die,
Alternatively, a processing method of drilling a material is often used for the purpose of reducing the number of molding steps, molding products with complex shapes, punching holes without distorting the overall shape, and improving material yield.

For example, a molded product 11 as shown in FIG.
When processing from a material 13 as shown in Figure (b),
If normal upsetting is applied, several steps are required, but as shown in FIG.
By applying a processing method in which the punch 21 is restrained by the punch 19 and moved in the direction of the arrow A, molding can be performed in one step.

In this case, a force is required to maintain contact between the upper and lower dies 17 and 19, that is, a closing force.

FIG. 6 shows a molding apparatus for carrying out the processing method of FIG. 5, and in the figure, reference numerals 17 and 19 indicate an upper die and a lower die that are arranged opposite to each other in the vertical direction.

The upper die 17 is supported by an upper holder 25 fixed to the upper die set plate 23, and an upper punch 27 is inserted into the upper die 17.
7 is in contact with the lower surface of the knockout pin 29.

On the other hand, the lower die 19 is supported by a ring member 33 via a ring 31, and a lower punch 35 is inserted into the lower die 19 and the ring member 33.

A columnar portion 41 of a plate 39 whose lower surface abuts the lower die set plate 37 is inserted into the ring member 33 .

A lower holder 43 that guides the ring member 33 in a vertically movable manner is arranged on the outside of the ring member 33, and the lower holder 43. A cylinder chamber 45 is formed by the lower surface of the ring member 33 and the plate 39.

The lower holder 43 has a through hole 4 communicating with the cylinder chamber 45.
6 is formed, and a pipe 48 connected to a hydraulic oil supply device 47 is connected to this through hole 46 . A check valve 49 and a hydraulic pump 50 are arranged in this pipe 48, and a relief valve 51 is arranged downstream of the check valve 49.

In the molding apparatus configured as above, when the slide (not shown) moves downward from the state shown on the left side of FIG.
As shown on the right side of FIG. 6, the upper die 17. lower die 1
9 and the ring member 33 move downward, but since the lower punch 35 is fixed, the lower punch 35 moves downward.
9, the material 13 is closed and molded, and the molded product 11 can be obtained.

In this molding device, hydraulic oil is supplied to the cylinder chamber 45 to urge the ring member 33 upward, and at the same time,
A closing force between the upper die 17 and the lower die 19 is applied by discharging the hydraulic fluid left over by the downward movement of the ring member 33 to the outside by the relief pulp 51.

[Problem to be solved by the invention]

However, in such a conventional molding apparatus, an unnecessarily large closing force is required to close the upper die 17 and the lower die 19, which increases the amount of work required for the press.

That is, for example, in order to mold the molded product 11 as shown in FIG. 4(a), as shown in FIG. 7, the load of the lower bunch 35 is maximum at the bottom dead center, and Since the required closing force is at its maximum at the bottom dead center, it is necessary to set the closing force based on this bottom dead center.
Since the load Py of the lower punch 35 changes as shown by the dotted line in the figure with respect to the displacement of the slide, a larger closing force than necessary is applied to the vicinity of the bottom dead center of the slide. , the stroke of the ring member 33 is required to be a stroke S as shown in FIG. become.

As a result, a press with a large torque capacity is required, increasing the energy required for forming.

In addition, since the contact between the upper and lower dies 17 and 19 begins at a position considerably higher than the bottom dead center, in the case of automated production, there are problems in that the accessibility of automated parts is poor and a press with a long slide stroke is required. be.

Furthermore, when molding an excessively voluminous material, there is a possibility of damaging the mold, and there are also problems in that the upper and lower dies 17 and 19 are separated and it becomes difficult to secure the dimensions of the molded product 11.

Note that a molding device disclosed in Japanese Patent Publication No. 56-21498 is known as a molding device similar to the above-mentioned molding device, but this molding device is a device fixed to a mechanical press, and Since each hydraulic pressure supply device is arranged outside the forging device, there are problems in that it is complicated to replace and maintain the mold, and that it is not compatible with various molded products.

The present invention solves the above-mentioned problems, and aims to provide a molding device that can prevent excessive application of closing force and significantly reduce the slide stroke required for molding compared to the conventional method. .

[Means to solve the problem]

A molding device according to the present invention inserts a punch into at least one of a pair of opposing dies, supports the die into which the punch is inserted by one side of a ring member housed in a holder, In a molding device in which the other side of the ring member is disposed within a cylinder chamber formed in the holder, a piston member is disposed inside the ring member, and one side of the piston member supports the punch. The other side of the piston member is disposed within the cylinder chamber formed within the holder or a cylinder chamber communicating therewith.

[For production]

In the molding device of the present invention, for example, when the slide moves downward, the upper die, lower die, and ring member move downward, and this downward movement of the ring member causes the hydraulic fluid in the cylinder chamber to flow into the piston member. This causes the piston member to move upward and the lower punch to move upward.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the molding apparatus of the present invention.
The left side of the figure shows the state of the material 13 before molding, and the right side shows the state after molding.

In the figure, reference numerals 53 and 55 indicate an upper die and a lower die that are arranged to face each other in the vertical direction.

The upper die 53 is supported by an upper holder 59 fixed to the upper die set plate 57, and an upper punch 61 is inserted into the upper die 53, and the upper punch 61 is inserted into the upper die 53.
1 is in contact with the lower surface of the knockout pin 63.

On the other hand, the lower die 55 is supported by a ring member 67 via a ring 65, and a lower punch 69 is inserted into the lower die 55 and the ring member 67.

A lower holder 71 is disposed outside the ring member 67 to guide the ring member 67 in a vertically movable manner, and the lower end of the sewage holder 71 is fixed to a lower gusset plate 73.

In this embodiment, a piston member 75 is disposed inside the ring member 67 so as to be movable in the vertical direction, and a lower punch 69 is disposed on the upper surface of the piston member 75.
The bottom side of is supported.

Further, a spring 79 is disposed between a stepped portion 77 formed on the upper part of the ring member 67 and the upper surface of the piston member 67 to bias the piston member 67 downward.

A columnar portion 83 of a plate 81 is inserted into the piston member 75, and the lower surface of the plate 81 contacts the lower gusset plate 73.

And piston member 75. A cylinder chamber 85 is formed by the lower surface of the ring member 67 and the plate 81.

The lower holder 71 has a through hole 8 communicating with the cylinder chamber 85.
7 is formed, and a pipe 90 connected to a hydraulic oil supply device 89 is connected to this through hole 87 . A check valve 91 and a hydraulic pump 92 are arranged in this pipe 90, and a relief valve 93 is arranged downstream of the check valve 91.

In the drawings, reference numeral 0 indicates an oil seal, and in this embodiment, the area of the lower surface of the ring member 67 and the area of the lower surface of the piston member 75 are the same area S.

In the molding apparatus configured as described above, as shown in FIG.
moves downward, the upper die 53. The lower die 55 and the ring member 67 move downward, and the ring member 67
Due to the downward movement of the hydraulic fluid in the cylinder chamber 85 is pushed out toward the piston member 75, which causes the piston member 75 to move upward and the lower punch 69 to move upward.

Therefore, in the molding apparatus configured as described above, the piston member 75 is arranged inside the ring member 67, and the lower bunch 69 is supported by one side of the piston member 75, and the other side of the piston member 75 is supported by the piston member 75. Since it is located in the cylinder chamber 85 formed in the lower holder 71, the lower punch 69 moves upward due to the downward movement of the lower die 55, and the closing force is also generated corresponding to the load of the lower punch. ,
There is no excessive closing force, and the slide stroke required for molding can be reduced compared to the conventional method.

Also, when using the same press, compared to conventional equipment,
It is possible to mold long molded products.

That is, in the molding apparatus configured as above, the area of the lower surface of the ring member 67 and the area of the lower surface of the piston member 75 are set to be the same area S, so the ring member 67 is
t, the piston member 75 moves the same distance S2
Therefore, the stroke of the slide required to manufacture the molded product 11 as shown in FIG. 4(a) is 1/2 of the conventional stroke, as shown in FIG. This makes it possible to significantly reduce the slide stroke compared to the conventional method.

In the molding device configured as above, the area of the lower surface of the ring member 67 and the area of the lower surface of the piston member 75 are set to be the same area S, so that the area required for lowering the lower die 55 by the upper die 53 is The load, that is, the closing force, matches the load P of the lower punch and changes depending on the degree of filling of the material 13 into the cavity 95, so unlike conventional molding equipment, a larger closing force than necessary is always applied. You won't have to do anything.

That is, an excessive closing force for closing the upper die 53 and the lower die 55 does not occur, and it is possible to reduce the amount of work required for pressing and the energy required for forming. Moreover, the stroke of the slide required for molding is also shortened.

As a result, the molding process can be performed using a press with a small torque capacity, and furthermore, even in the case of automatic production, the process can be performed using a press with a short slide stroke.

Also, since the upper and lower dies 53.55 do not come into contact with each other with an unnecessarily large closing force, the upper and lower dies 53.55
This makes it possible to improve the lifespan of the

Furthermore, in the forming apparatus configured as described above, hydraulic pressure is generated in the cylinder chamber 85 by the forming load of the lower punch 69, so there is no need to provide a large hydraulic pressure supply device outside as in the conventional case. It is sufficient to simply arrange a hydraulic oil replenishing device 89 for replenishing hydraulic oil.

In addition, in this embodiment, since the hydraulic oil replenishing device 89 is provided with a relief valve 93, by adjusting the set pressure of the relief valve 93, it is possible to set the forming load of the lower pan 169 near the bottom dead center. Even when molding a material with excessive volume, the mold will not be damaged. Further, the relief valve has the effect of preventing abnormal loads, and an overload safety device for the press may not be necessary in some cases.

In this case, at the end of one molding cycle, part of the hydraulic oil in the cylinder chamber 85 is discharged to the outside by the relief valve 93, but until the press slide is raised and the next molding starts. Then, hydraulic oil is supplied into the cylinder chamber 85 by the hydraulic oil replenishing device 89, and the hydraulic oil in the cylinder chamber 85 is kept at a specified amount.

Furthermore, in the molding apparatus configured as described above, almost all of the constituent parts of the molding apparatus can be accommodated within the die set, resulting in a very compact configuration. Therefore, replacement and maintenance of the upper and lower dies 53, 55, upper and lower punches 61, 69, etc. becomes extremely easy, and the entire device can be replaced in a short time.

Furthermore, it is very easy to replace the ring member 67 and the piston member 75, and by replacing these members,
Since it is possible to easily convert the ratio of closing force and forming load (lower punch load), it becomes possible to easily correspond to a wide variety of molded products.

In addition, in the embodiment described above, an example was described in which the piston member 75 was urged downward by the spring 79.
The present invention is not limited to this embodiment, and it goes without saying that the piston member 75 may be biased by, for example, a hydraulic or pneumatic cylinder.

Further, in the embodiments described above, an example was described in which a product as shown in FIG. 4(a) was molded, but the present invention is not limited to such embodiments. By doing so, it becomes possible to easily form gears and the like.

Further, in the embodiments described above, an example was described in which the cylinder chamber 85 was formed below the lower die 55, but the present invention is not limited to such an embodiment. It goes without saying that the cylinder chamber 85 may be arranged on the slide side (also, the dies may be arranged facing each other in the horizontal direction, etc.).

Further, in the embodiment described above, an example was described in which the area of the lower surfaces of the ring member 67 and the piston member 75 were made the same, but the present invention is not limited to such an embodiment, and the shape of the molded product etc. Of course, correspondingly, the areas of the lower surfaces of the ring member 67 and the piston member 75 may be changed to enable molding with an optimal closing force.

〔Effect of the invention〕

As described above, in the forming apparatus of the present invention, the piston member is disposed inside the ring member, one side of the piston member supports the punch, and the other side of the piston member is placed inside the cylinder chamber formed in the holder. This prevents excessive closing force and significantly reduces the slide stroke required for molding compared to conventional methods.
Since the main parts of the device are housed within the gusset, maintenance and replacement of the parts is easy, and there are advantages in that it is highly adaptable to a wide variety of molded products.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the molding apparatus of the present invention. FIG. 2 is a longitudinal cross-sectional view showing the state of the molding apparatus shown in FIG. 1 at the time of supplying the material. FIG. 3 is a graph showing the relationship between sliding displacement and load of the molding apparatus shown in FIG. FIG. 4 is a side view showing one side of the raw material and the molded product. FIG. 5 is an explanatory diagram showing the closure forming method. FIG. 6 is a longitudinal sectional view showing one side of a conventional molding apparatus. FIG. 7 is a graph showing the relationship between sliding displacement and load of the molding apparatus shown in FIG. 6. [Explanation of symbols of main parts] 53... Upper die 55... Lower die 67... Ring member 69... Lower punch 71... Lower holder 75... Piston member 85... Cylinder Room. Patent applicant AIDA Engineering Co., Ltd. Figure 9 (b) CG)

Claims (1)

[Claims] (1) A punch is inserted into at least one of a pair of opposing dies, and the die into which the punch is inserted is supported by one side of a ring member housed in a holder, and the other side of the ring member is In the forming apparatus, a piston member is disposed inside the ring member, and one side of the piston member supports the punch, and the other side of the piston member is disposed within a cylinder chamber formed in the holder. A molding device characterized in that one side of the molding device is disposed within the cylinder chamber formed within the holder or a cylinder chamber communicating therewith.