JPH049115Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention utilizes a hydraulic press molding method (isostatic press molding method) using a liquid as a pressurizing medium to form a molded body of a predetermined shape from a powder material. The present invention relates to a hydraulic press device used for obtaining the same.

(Prior art) A hydraulic press molding method using liquid as a pressurizing medium is known as one of the press molding methods for obtaining a compact (powder compact) of a predetermined shape from a powder material such as metal powder or ceramic powder. It is being

When molding is performed by this hydraulic press molding method, rubber or the like is usually used, as shown in JP-A No. 61-67599, which has an internal space corresponding to the shape of the molded product to be obtained. A mold made of an elastic material is prepared, then the internal space of the mold is filled with a powder material, the powder filling port of the mold is sealed, and then the mold is placed in a pressure vessel. Then, pressurized liquid is supplied to the pressure vessel,
The mold filled with the powder material is compressed under pressure. As a result, the powder material is compressed and press-molded.

According to this hydraulic press molding method, compared to the conventional general press molding method, which is a mechanical press molding method using a pressing mold such as a mold, in addition to the powder material to be compression press molded, Since the compressive force applied is uniform over the entire powder material, there is an advantage that a homogeneous molded body can be obtained regardless of the size or shape of the molded body to be obtained.

(Problems to be Solved by the Invention) However, when a conventional hydraulic press device is used to perform hydraulic press molding as described above, there are problems as described below.

That is, as shown in FIG. 3, when a conventional hydraulic press device is used, a mold S filled with a powder material M is placed in a pressure chamber 4 of a pressure vessel 2. It is required to open the lid 6 of the pressure vessel 2 and insert the mold S into the predetermined position from the opening of the pressure chamber 4.

In addition, when the pressure chamber 4 is supplied with high-pressure pressurized liquid from the pressure generator 8 and the mold S is compressed and contracted, the pressure chamber 4 of the pressure vessel 2 is completely sealed, and the mold In order to prevent pressurized liquid from entering into S, the main mold Sa and lid mold (stopper) of mold S
Sb must be tightly sealed in advance with a sealing material or the like.

Furthermore, after the mold S is compressed and the powder material M filled in its internal space is press-molded, the pressurized liquid is discharged from the pressure chamber 4 to reduce the pressure inside the pressure chamber 4. Thereafter, it is required to open the lid 6 again, pull out the mold S from the pressure vessel 2, and take out the press-molded body from inside the mold S.

As described above, when inserting the mold S filled with the powder material M into the pressure vessel 2 and withdrawing the mold S with a molded body formed inside from the pressure chamber 4, the cover 6 must be closed. This involves troublesome work such as opening and closing, and also troublesome work such as ensuring the sealing performance of the mold S and taking out the molded body from the mold S. When press forming is performed, a relatively large amount of working time and complicated labor are required.

The relatively long working time and complicated labor associated with hydraulic press molding are a major obstacle to improving productivity and automating the process. It is difficult to avoid such a problem unless the basic configuration of the hydraulic press device, which includes a pressure vessel or the like, is changed.

In view of these points, the present invention eliminates the relatively large amount of time required to insert a mold into a pressure vessel and take out the molded body from the mold, which were conventionally required, when obtaining a molded body from a powder material. It is possible to obtain a desired molded product by reducing work time and complicated labor, and it is possible to further improve productivity and automation rate in hydraulic press molding compared to conventional methods. It is an object of the present invention to provide a hydraulic press device which is configured as follows.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the vacuum press device according to the present invention uses a pressurized liquid supplied to a pressure vessel together with a pressurized liquid when obtaining a molded body from a powder material. A punch is provided which acts to pressurize the powder material, and this punch applies a pseudo-hydrostatic pressure to the powder material. Specifically, it includes a pressure vessel that forms a pressure chamber inside and is provided with an opening that communicates the pressure chamber with the outside, a guide cylinder member fixed to the opening of the pressure vessel, and a guide cylinder. It is formed integrally with the member, has a cylindrical shape with a bottom, and extends from the guide cylinder member into the pressure chamber, and the powder material is supplied into the inside through the guide cylinder member, and between the outer surface part and the inner surface of the pressure chamber. a flexible mold part that forms a closed space in the pressure vessel; a pressure generating part that supplies pressurized liquid to the closed space between the outer surface of the flexible mold part formed in the pressure vessel and the inner surface of the pressure chamber; Pressure is inserted from outside the pressure vessel into the flexible mold part through the guide cylinder member, and is supplied to the closed space formed inside the pressure vessel between the outer surface of the flexible mold part and the inner surface of the pressure chamber. Working together with liquid,
It is configured to include a punch that presses the powder material supplied into the flexible mold section.

(Function) In the hydraulic press device configured as described above, when hydraulic press molding is performed, first, both predetermined powder materials are supplied from outside the pressure vessel to the flexible mold part through the guide cylinder member. be done. Next, in order to press-mold the powder material, pressurized liquid is supplied to the pressure vessel, and a punch is inserted from outside the pressure vessel through the guide tube member into the flexible mold section.

As a result, the powder material is pressurized and compressed by the cooperative action of the pressurized liquid and the punch, and a molded body having a desired shape is formed within the flexible mold section. Subsequently, the pressurized liquid is discharged from the pressure vessel, the punch is retracted out of the pressure vessel through the guide cylinder member, and the molded body formed in the flexible mold part is drawn out through the guide cylinder member by an appropriate drawing means. pulled out of the pressure vessel.

Therefore, according to the hydraulic press device according to the present invention, since hydraulic press molding is performed as described above, the main die and lid of the mold, which are required for conventional hydraulic press molding, are not required. The relatively large amount of work time and complicated labor required for sealing with the mold, inserting the mold into the pressure vessel, pulling out the mold from the pressure vessel, and taking out the molded body from the mold are significantly reduced or eliminated. The productivity and automation rate are greatly improved compared to conventional methods.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the basic configuration of an example of a hydraulic press device according to the present invention. In FIG. 1, pressurized liquid (pressure medium water) from a pressure generator 20 is supplied to a pressure chamber 12 of a pressure vessel 10 through a passage 22. As shown in FIG. The pressure generator 20 is composed of, for example, a pump unit that uses two cylinders to alternately push out pressurized liquid, and supplies the pressurized liquid to the pressure chamber 12 continuously or in stages. It is designed to supply.

The pressure chamber 12 of the pressure vessel 10 is made of an elastic material such as rubber, and has a bottomed cylindrical flexible mold part 30 inserted therein, which is formed to correspond to the shape of the molded product to be obtained. A guide cylinder member 35 is integrally connected and engaged with the flexible mold portion 30 . The guide cylinder member 35 includes a stopper portion 1 that forms an upper opening of the pressure vessel 10 that communicates the pressure chamber 12 with the outside.
It is fixed to 4. Thereby, the flexible mold part 3
0 forms a closed space between its outer surface and the inner surface of the pressure chamber 12, and this closed space is filled with pressurized liquid supplied from the pressure generator 20 to the pressure chamber 12.

On the other hand, above the pressure vessel 10, there are provided a pressurizing cylinder 40 and a molded body drawing machine 50, which are movable in a direction along a guide rail 38 arranged in the left-right direction in FIG. The pressurizing cylinder 40 is fixed by a locking means (not shown) directly above the guide cylinder member 35, and when hydraulic pressure is supplied through an oil passage 44 to a hydraulic oil chamber formed inside the pressurizing cylinder 40, the hydraulic pressure increases. Accordingly, as shown by the solid line in FIG. 1, the punch 42 is projected downward and inserted into the flexible mold part 30 through the guide cylinder member 35. Further, when the hydraulic pressure is removed from the hydraulic oil chamber of the pressurizing cylinder 40, the punch 42 is pulled up and evacuated to the outside of the pressure vessel 10, as shown by the dashed line in FIG.

The molded object drawing machine 50 includes a drawing cylinder 52 and an attraction/holding member 54 made of a magnet, a suction cup, a combination thereof, etc., which attracts and holds the molded object formed in the flexible mold section 30. 52
When the drawer cylinder 52 assumes the first operating state, the suction holding member 54 is retracted, as shown in FIG. It is said to be in a protruding state.

In addition to the above-described configuration, a control unit 100 is provided in this example to control the pressing force of the punch 42. The control unit 100 is supplied with a detection signal Sp corresponding to the pressure in the pressure chamber 12 obtained from a pressure sensor 90 that detects the pressure in the passage 22.
Based on this detection signal Sp, the control unit 100 forms a control signal Cp according to the pressure inside the pressure chamber 12 in order to control the hydraulic pressure supplied to the hydraulic oil chamber of the pressurizing cylinder 40, and then outputs the control signal Cp. It is supplied to a solenoid valve 45 installed in an oil passage 44. As a result, the electromagnetic valve 45 changes its opening amount in accordance with the pressure within the pressure chamber 12 to adjust the hydraulic pressure supplied to the hydraulic oil chamber of the pressurizing cylinder 40 .

When hydraulic press molding is performed based on the above-described configuration, first, the pressurizing cylinder 40 and the suction holding member 54 with the punch 42 retracted to the position shown by the dashed line in FIG. The molded body drawing machine 50 in the retracted state is moved slightly to the left from the position shown in FIG. A predetermined amount of powder material is placed directly above the mold section 30 and fed to the powder material supplying machine 6.
0 through the guide cylinder member 35 and the flexible mold part 30
is supplied to

Next, in order to press-form the powder material, the powder material feeder 60 is returned to a predetermined position, and the pressurizing cylinder 40 and molded body drawer 50 are moved to the positions shown in FIG. 1. Then, pressurized liquid is supplied to the pressure vessel 10 from the pressure generator 20 through the passage 22, and the pressurized cylinder 40
Hydraulic pressure is supplied to the hydraulic oil chamber through an oil passage 44 and a solenoid valve 45.

In this case, the control signal from the control unit 100
Cp causes the opening amount of the solenoid valve 45 to correspond to the pressure inside the pressure chamber 12, and the pressurizing cylinder 40
The hydraulic pressure supplied to the hydraulic oil chamber is regulated.
As a result, the punch 42 protrudes with the same pressure as the pressurized liquid in the pressure chamber 12, and the flexible mold part 30
The powder material filled inside is pressurized.

As a result, the side and lower surfaces of the flexible mold section 30 are compressed and contracted by the pressure of the pressurized liquid in the pressure chamber 12, as shown by solid lines in FIG. As a result, the powder material is compressed from the sides and below, and is also compressed from above by pseudo-hydrostatic pressure from the punch 42.
A molded body M' as shown by the solid line in the figure is formed. That is, the powder material is press-molded by the cooperative action of the pressurized liquid and the punch 42. At this time, the flexible mold part 30 and the guide cylinder member 35
Because it is formed so that it connects integrally,
Ingress of pressurized liquid into the flexible mold part 30 is completely prevented.

Subsequently, the pressurized liquid is discharged from the pressure chamber 12, and the punch 42 is retracted outside the pressure vessel 10, as shown by the dashed line in FIG. As a result, as shown in Figure 2,
The flexible mold part 30 is restored to its original shape, and the flexible mold part 3
A molded body M' having a uniform density and compressed into a desired shape is obtained within 0.0 yen. Next, after the pressure cylinder 40 and the molded object drawer 50 are moved to the position shown in FIG.
The molded body M' is held by suction. Further, the drawer cylinder 52 assumes the first operating state, and the molded body M' is pulled out of the pressure vessel 10 from the flexible mold part 30 via the guide tube member 35, and then the molded body drawer 50 moves along the guide rail 38 and transports the molded body M' to, for example, a sintering furnace where the next process is performed.

As mentioned above, in this example, the sealing of the main mold and lid mold in the mold, the insertion of the mold into the pressure vessel, and the pulling out of the mold from the pressure vessel, which are required for conventional hydraulic press molding, are performed. The relatively long working time and complicated labor required for taking out the molded body from the mold are significantly reduced or eliminated, and most of the steps in hydraulic press molding are performed automatically. Therefore, the productivity and automation rate can be greatly improved when a molded body is obtained from a powder material using the hydraulic press molding method.

(Effects of the invention) As is clear from the above explanation, the hydraulic press device according to the invention has the advantage of achieving a compact size that is conventionally required when obtaining a compact from a powder material using the hydraulic press molding method. In addition, ensuring sealing performance in the mold,
The relatively large amount of work time and complicated labor required for inserting a mold into a pressure vessel, pulling out a mold from a pressure vessel, and taking out a molded object from a mold can be significantly reduced or eliminated. Therefore, productivity and automation rate can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the basic configuration of an example of a hydraulic press device according to the present invention, FIG. 2 is a schematic diagram for explaining the operation of the hydraulic press device shown in FIG. 1, and FIG. The figure is a diagram used to explain a conventional general hydraulic press device. In the figure, 10 is a pressure vessel, 30 is a flexible mold part, 3
5 is a guide cylinder member, 40 is a pressure cylinder, 42 is a punch, and 50 is a molded body drawing machine.

Claims (1)

[Scope of Claim for Utility Model Registration] A pressure vessel that forms a pressure chamber inside and is provided with an opening that communicates the pressure chamber with the outside; a guide cylinder member that is fixed to the opening of the pressure vessel; , which is formed integrally with the guide cylinder member, has a bottomed cylinder shape, and extends from the guide cylinder member into the pressure chamber, into which powder material is supplied through the guide cylinder member, and whose outer surface portion and a flexible mold part that forms a closed space between the inner surface of the pressure chamber; a pressure generating part that supplies pressurized liquid to the closed space formed in the pressure vessel; A powder material that is inserted into the flexible mold section through the guide cylinder member and supplied into the flexible mold section in cooperation with the pressurized liquid that is supplied to the closed space formed in the pressure vessel. A hydraulic press device comprising: a punch for pressurizing;