JPH018957Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hot isostatic pressurizing device that uses a viscoplastic pressure medium (hereinafter also referred to as pressure medium) such as graphite grease. The main purpose is to eliminate ignition, smoke, etc.

A hot isostatic pressing device called a hydraulic HIP is used to pressurize the molded article isotropically using hydrostatic pressure raised to an ultra-high pressure.

By the way, in hydraulic HIP, a larger amount of pressure medium is used compared to isostatic extrusion, so when taking out the pressure medium from the container after molding, there is a risk of smoke or ignition. There is a risk of inviting

In other words, it is at a high temperature of over 500℃, and if it comes into contact with oxygen in this state, it can cause serious accidents such as smoke and ignition.

In addition, in the case of hydrostatic extrusion of tubular products, the container is fitted into a die, and on the other hand, a pressurizing stem having a mandrel at its axis is provided on the side opposite to the die, so this hydrostatic extrusion press It would be effective if it could be used for hydraulic HIP.

Therefore, the present invention makes effective use of a hydrostatic extrusion press for tubular products to make it possible to perform hydraulic HIP, and at the same time, it is possible to perform depressurization under closed conditions that do not come into contact with oxygen when removing the pressure medium after molding. Therefore, smoking and ignition of the pressure medium are prevented. Therefore, in the present invention, the container is fitted into the first lid fixed in the pressurizing direction via the seal packing, and the pressurized medium is pressurized. A second lid on the pressure side is slidably fitted to the container via a seal packing, and the molded object in the container is uniformly applied with hydrostatic pressure generated by the pressure raising operation of the viscoplastic pressure medium by the second lid. In the pressurized device, a through hole on the axis of the container is formed in the second lid, the through hole communicates with the container, and an ultra-high pressure stop valve is freely inserted into and removed from the through hole via a seal packing. and the through hole is connected to the trap via the communication hole,
The viscoplastic pressure medium is configured such that when the ultra-high pressure stop valve is removed from the through hole, the viscoplastic pressure medium in the container escapes into the cooling water tank through the communication hole. The present invention provides a pressure reducing device in a hot isostatic pressurizing device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a hydrostatic extrusion press for tubular products, in which a container 1 is supported on a container holder 2 and is connected by a cylinder arrangement 4 across a press platen 3 and the container holder 2. It is made to be able to freely move forward and backward in the press direction (in this example, in the lateral direction).

A die 6 is fixed to the press platen 3 via a backer 5 in the press (pressure) direction, and the container 1 is fitted onto the die 6 via a seal packing 20.

A pressure stem 10 is attached to a crosshead 11 on the opposite side from the die 6.
The head of the pressurizing stem 1 is slidably fitted into the container 1 via the seal packing 12, and the pressurizing stem 1
A mandrel 13 is fitted into the hollow portion of the press shaft 10 via a mandrel cylinder mechanism 14 so as to be freely retractable on the press axis, and the mandrel 13 and the head of the pressurizing stem 10 are made airtight with a seal packing 15.

The billet 16 inside the container 1 is filled with pressure medium 1.
7 is isotropically pressurized by ultra-high hydrostatic pressure generated by the pressure increasing operation as the pressurizing stem 10 advances, and the tubular material 18 is extruded from the annular space defined by the die 6 and the tip of the mandrel 13. It will be done.

In the embodiment of the present invention, a press having such a configuration is used, and instead of the die 6, a first lid 19, which is a blind lid, is attached to the bucket 5.

For example, the die 6 and the first lid 19 are arranged side by side on a slide frame that is movable in a direction orthogonal to the press direction using the backer 5 as a slide guide surface, and the container 1 is moved backward (movement to the right in the figure). The dies 6 and the first lids 19 are alternately positioned on the press axis.

Then, the container 1 is fitted onto the first lid 19 via the seal packing 20.

Furthermore, the head of the pressure stem 10 is connected to the second pressure side.
The lid 21 is slidably fitted into the container 1 via the seal packing 12, and
A through hole 22 in the second lid 21 that communicates with the container 1
is formed in the through hole 22, and an ultra-high pressure stop valve 2 is formed in the through hole 22.
3 are removably fitted through the seal packing 15.

Here, the ultra-high pressure stop valve 23 is constructed by replacing the tip of the mandrel 13 with a short one, and when the hydraulic pressure is HIP, the tip of the tip touches the end surface of the second lid 21 as shown in FIG. It is matched.

The hollow part of the pressurizing stem 10 is used as a communication hole 24,
A radial through hole 25 formed in the stem backer 25
It communicates with a trap 26 provided outside the press via A.

Note that the mandrel holder 27 has an axial passage 28 formed on its outer periphery.

FIG. 5 shows a second embodiment of the present invention, in which the first lid 1
9 is provided with a poppet-shaped check valve 29, and gas such as nitrogen can be supplied into the container 1 through a through hole 30 against a spring 31 of the check valve 29.

In this second embodiment, it is desirable that the first lid 19 and the die 6, together with the backer 5, be moved back and forth on the press platen 3 in a direction orthogonal to the press direction.

Next, the effect will be explained.

In Figures 2 to 4, container 1 is
The container 1 is fitted onto the lid 19 via a seal packing 20, and a molded object 32 is supplied into the container 1.

This supply is performed by moving the pressurizing stem 10 backward, moving the molded object 32 supported by a loader (a billet loader may also be used) from the rear end of the container 1 by moving the mandrel 13 forward; This can be done via 23 advances.

When this supply (charge) is finished, the pressure medium 33 is supplied, and the pressurizing stem 10 is moved forward with the through hole 22 closed by the stop valve 23, and the ultra-high hydrostatic pressure generated by this pressurization operation is applied. Therefore, the pressure is applied isotropically.

During this pressurization, retraction of the stop valve 23 is prevented by applying pressure to the mandrel cylinder 14.

After molding, the pressure stem 10 is moved back as shown in FIG. 3 to reduce the pressure of the pressure medium 33, and then the mandrel 13 is moved back as shown in FIG.
The stop valve 23 is pulled out from the through hole 22, and the pressurized pressure medium 3 is released through the communication holes 24 and 25A.
2 is allowed to escape into the trap 26 and taken out in the form of mist or gas, thereby preventing the pressure medium at several hundred degrees Celsius from emitting smoke or igniting.

In the case of the second embodiment, after molding, the fourth
In the state shown in the figure, the pressure medium in the container 1 can be forced to escape to the trap 26 by supplying nitrogen or the like through the through hole 30.

The molded product is then taken out from the front of the container 1 through the backward movement of the container 1 and the forward movement of the mandrel 13.

In the present invention, the container 1 is fitted into the first lid 19 fixed in the pressure direction through the seal packing 20, and the second lid 21 on the pressure side is slidably fitted into the container 1 through the seal packing 12. In an apparatus in which the object to be formed 32 in the container 1 is pressurized in the same direction by the hydrostatic pressure generated by the pressure increasing operation of the viscoplastic pressure medium 33 by the second lid 21, the second lid 2
1 is formed with a through hole 22 on the axis of the container, the through hole 22 communicates with the container 1, and an ultra-high pressure stop valve 23 is inserted into the through hole 22 via a seal packing 15 so as to be freely insertable and removable. Furthermore, the through hole 22 is connected to the cooling water tank 26 via the communication hole 24.
It is characterized in that it is configured such that when the ultra-high pressure stop valve 23 is pulled out from the through hole 22, the viscoplastic pressure medium 33 inside the container 1 escapes into the trap 26 through the communication hole 24. Since the present invention relates to a pressure reducing device in a hot isostatic pressurizing device using a viscoplastic pressure medium, it has the following advantages.

The container 1 has a first lid 19, a second lid 21 and a second lid.
Since the pressure medium discharge through hole 22 formed in the lid 21 is closed by the ultra-high pressure stop valve 23, when reducing the pressure once to discharge the pressure medium 32 after pressure molding, There is no danger of the pressure medium 32 emitting smoke or catching fire.

In addition, the ultra-high pressure stop valve 23 can control the discharge of the pressure medium 32, and since it can be inserted into and removed from the through hole 22 on the axis of the container, the pressure medium can be discharged smoothly and quickly. It can be used as a charger or ejector for molded objects and molded objects.

In addition, since the pressure medium 32 after molding escapes into the cooling water tank 26 and becomes a mist or gas, there is no risk of ignition or smoke generation.Furthermore, since a hydrostatic extrusion press for tubular materials can be used, a single function can be achieved. Can be multi-functional.

[Brief explanation of drawings]

Fig. 1 is an elevational sectional view showing only the main parts of a hydrostatic extrusion press for tubular bodies, Figs. 2 to 4 are elevational sectional views showing the first embodiment of the present invention in the order of steps, and Fig. 5 FIG. 2 is an elevational sectional view of the second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Container, 19... First lid, 21... Second lid, 22... Through hole, 23... Stop valve, 2
4...Communication hole, 26...Trap.

Claims (1)

[Claims for Utility Model Registration] The container 1 is attached to the first lid 19 fixed in the pressurizing direction.
is fitted into the container 1 via the seal packing 20, the second lid 21 on the pressurizing side is slidably fitted into the container 1 via the seal packing 12, and the molded object 32 in the container 1 is fitted into the viscoplastic pressure medium 33. said second lid 2 of
In the device that is pressurized in the same direction by the hydrostatic pressure generated by the pressure increasing operation according to No. 1, the second lid 21 has a through hole 22 on the axis of the container.
is formed, the through hole 22 communicates with the container 1, and an ultra-high pressure stop valve 2 is connected to the through hole 22.
3 is removably inserted through the seal packing 15, and furthermore, the through hole 22 is communicated with the trap 26 through the communication hole 24, and when the ultra-high pressure stop valve 23 is pulled out from the through hole 22, the container 1
A pressure reducing device in a hot isostatic pressurizing device using a viscoplastic pressure medium, characterized in that the viscoplastic pressure medium 33 therein is configured to escape into a trap 26 through a communication hole 24.