JPH0519327U - Hot isotropic pressure press - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent processing defects and defects by shortening the time required for heating and cooling the object to be processed and reducing the temperature difference during heating of the object to be processed. [Structure] Heaters 10 and 11 provided in the furnace chamber 9 in the pressure vessel 1
Is composed of a first heater 10 which is arranged on the outer peripheral side of the furnace chamber 9 and which is cylindrical in plan view, and a second heater 11 which is arranged in the center of the furnace chamber 9 and which is cylindrical in plan view. A storage section 12 for the article to be processed 16 is provided between 10 and 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot isostatic pressurizing device (hereinafter, also referred to as a HIP device), and more specifically to an improved heating means (heater) of the HIP device.

[0002]

[Prior Art]

 The heating device of the HIP device is composed of a cylindrical heat insulating layer and a heater arranged therein, and the shape thereof is usually a cylindrical shape according to the internal shape of the pressure vessel, and the heater is also arranged along the circumferential surface. Thus, the article to be treated is heated from the outer peripheral surface (including the upper and lower surfaces) (see Japanese Patent Publication No. 56-53188).

On the other hand, there is also a technique in which a vertically penetrating pipe is provided in the center of the furnace chamber to promote convection of high-pressure gas to accelerate the cooling rate after HIP treatment (Japanese Patent Laid-Open No. 61-29526). See).

[0004]

[Problems to be solved by the device]

 In each of the above-mentioned conventional techniques, the cylindrical heater is provided only on the outer peripheral side of the furnace chamber. Therefore, all the products to be processed contained in the furnace chamber were heated only from the outer peripheral surface side.

However, as the size of the processing chamber becomes larger, the heat reaching distance from the heater becomes longer in the central part of the object to be processed, and the temperature rise in the central part of the object to be processed is higher than the temperature increase around the heater. It is significantly slowed down, and as a result, the temperature difference between the central part and the outer part of the article to be processed becomes significant. This temperature difference increases in proportion to the size (larger diameter) of the processing chamber (furnace chamber), and also increases as the heating rate increases.

In order to reduce the HIP processing cost, it is indispensable to process a large amount of products to be processed and shorten the cycle time. However, in the conventional technology, the temperature difference described above increases. However, there is a problem that the performance of the object to be processed is deteriorated or a defect is generated. The present invention shortens the heat reaching distance to the object to be processed by making the heater arranged in the furnace chamber double inside and outside, a so-called donut shape, thereby increasing the temperature rising rate of the object to be processed and increasing the temperature of the object to be processed. The object is to reduce the temperature difference between the processed products and also to accelerate the gas convection after the HIP process to accelerate the cooling rate.

[0007]

[Means for Solving the Problems]

 According to the present invention, a cylindrical pressure vessel 1 having openable and closable lid members 2 and 3 at least at one end is provided with a bottomed cylindrical heat insulating layer 8 having a top plate portion 6 and a body portion 7 and is provided inside. In order to achieve the above-mentioned object in a hot isostatic pressurizing device that defines a furnace chamber 9 and is provided with heaters 10 and 11 for heating an article 16 to be processed in the furnace chamber 9, Taking technical measures.

That is, in the present invention according to claim 1, the heaters 10 and 11 are arranged in the central portion of the first heater 10 and the furnace chamber 9 which are cylindrical in a plan view and are arranged on the outer peripheral side of the furnace chamber 9. It is characterized by comprising a second heater 11 having a cylindrical or rod shape in a plan view, and a storage section 12 for the article to be treated 16 provided between the both heaters 10, 11. Further, in the present invention according to claim 2, passages 17 and 18 communicating with the inside and outside of the heat insulating layer 8 are provided in the top plate portion 6 and the lower portion of the body portion 7 of the heat insulating layer 8, and the passages 17 and 18 are respectively provided. It is characterized in that it is equipped with an on-off valve 19,20.

[0009]

[Action]

 According to the present invention according to claim 1, the workpiece 16 housed in the housing portion 12 is heated from the inside and outside by energizing the first heater 10 and the second heater 11, and the heat reaching distance is increased. Becomes shorter and the temperature difference becomes smaller. According to the present invention according to claim 2, by opening the on-off valve 19 of the top plate portion 6 and the on-off valve 20 of the lower portion of the body portion 7 in the cooling process after the HIP treatment, as shown in FIG. Gas convection occurs inside and outside, and the first heater 11 forms a vertical passage 21 at the center of the furnace chamber 9 to accelerate the cooling rate of the workpiece 16.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 showing a vertical section of the HIP device and FIG. 2 showing a horizontal section, a cylindrical pressure vessel 1 having upper and lower openings is provided with upper and lower lid members 2 and 3 which can be freely inserted into and removed from the opening. They are fitted together, and the fitting surface is provided with high-pressure packings 4, 5.

In the embodiment, the lower lid member 3 is composed of a lower upper lid 3A having an annular shape and a lower lower lid 3B which is removably fitted in the lower upper lid 3A via a high pressure packing 5A. ing. The pressure vessel 1 is provided with an inverted cup-shaped heat insulation layer 8 composed of a top plate portion 6 and a body portion 7 and defines a furnace chamber 9 inside the heat insulation layer 8.In this embodiment, the heat insulation layer 8 is It is placed on the lower upper lid 3A.

The furnace chamber 9 has a cylindrical first heater 10 in a plan view on the outer peripheral side along the body portion 7 of the heat insulating layer 8 and a cylindrical heater in a plan view in the center of the furnace chamber 9. A rod-shaped second heater 11 is arranged respectively, and a so-called donut-shaped storage portion 12 for storing the article to be processed 16 is so-called stacked between the heaters 10 and 11. In the embodiment, the first heater 10 is erected on the lower upper lid 3A, the second heater 11 is erected on the lower lower lid 3B, and the energizing wirings 13 and 14 embedded in the lower upper lid 3A and the lower lower lid 3B, respectively. And a hearth 15 is provided on the lower lower lid 3B.

Therefore, in this embodiment, the articles 16 to be processed stored in the storage section 12 stacked on the hearth 15 are moved into the furnace chamber 9 by moving the lower lid 3B together with the second heater 11. It is said that it can be inserted and removed freely. It should be noted that a dolly-type or swivel-type press frame (not shown) is detachably engaged with the upper lid member 2 and the lower lower lid 3B so as to be able to carry the axial force of the press.

Next, the operation will be described. The article to be treated 16 housed in the accommodating portion 12 in the stacked state is placed in the furnace chamber 9 by energizing the first heater 10 and the second heater 11 respectively. Using an inert gas such as argon as a pressure medium, pressure treatment is normally isotropically performed by utilizing the synergistic effect of a pressure of 1000 kgf / cm ² or more and a temperature of 1000 ° C. or more. During this pressurizing process (HIP process), the product 16 is heated from the inside and outside by the first heater 10 and the second heater 11, and the heat reaching distance is shortened. The temperature rising rate of 16 itself increases, and the temperature difference between the central portion and the outer peripheral portion of the article to be treated 16 becomes small, so that the whole article 16 to be treated can be heat-treated quickly and uniformly.

Particularly, when the temperature is raised at a low pressure, the heat transfer from the heaters 10 and 11 by radiation is more dominant than the heat transfer by convection of the pressure medium gas. Even if the tongue-shaped cavity is provided, the effect at the time of heating is small, and the effect of directly heating with the heater 11 from the central portion becomes large. After the HIP process, the power supply to the first and second heaters 10 and 11 is stopped, and the cooling process is performed after the depressurization process, etc., and the lower lower lid 3B is lowered by an elevating device (not shown). The article 16 to be treated is taken out from the furnace chamber 9 together with the second heater 11.

FIG. 3 shows an embodiment of the present invention according to claim (2), in which the inside and outside of the heat insulating layer 8 are respectively communicated with the central portion of the top plate portion 6 of the heat insulating layer 8 and the radial position of the lower portion of the body portion 7. The passages 17 and 18 are formed, and the passages 17 and 18 are provided with, for example, electromagnetically-operated opening / closing valves 19 and 20 that are remotely and automatically operated. Others have already been described with reference to FIGS. 1 and 2. The contents are the same as those described above, and common parts are indicated by common symbols.

In the apparatus of FIG. 3, the convection of gas is promoted as shown by the arrow in FIG. 3 by opening the on-off valves 19 and 20 that have been closed until the HIP process in the cooling process. The second heater 11 forms the entrant passage 21 to accelerate the cooling rate of the article 16 to be processed. In the above embodiments, either the upper lid member or the lower lid member may be insertable and removable (openable and closable).

The second heater 11 may have a solid rod shape.

[0019]

[Effect of the device]

 The present invention is as described above, and according to the present invention according to claim (1), the heat arrival distance to the object to be processed at the time of HIP becomes short, and the temperature of the outer peripheral portion and the central portion of the object to be treated is reduced. The difference is reduced, and quick and uniform HIP processing can be performed. According to the present invention according to claim (2), the convection of gas is promoted by opening the on-off valve provided in the passage in the cooling process, and at this time, the second heater having a cylindrical or rod shape is used. Since a gas passage is formed in the central part, the cooling time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention according to claim (1).

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view of an embodiment of the present invention according to claim (2).

[Explanation of symbols]

 1 Pressure Vessel 2 Upper Lid Member 3 Lower Lid Member 6 Top Plate 7 Body 8 Insulation Layer 9 Furnace Chamber 10 First Heater 11 Second Heater 12 Storage 17 Passage 18 Passage 19 Open / close valve 20 Open / close valve

Claims (2)

[Scope of utility model registration request] 1. A top plate part (6) and a body part are provided in a cylindrical pressure vessel (1) having at least one end a lid member (2) (3) which can be opened and closed.
A bottomed cylindrical heat insulating layer (8) with (7) is provided inside the furnace chamber.
(9) is defined, and in the hot isostatic pressurizing device, the heater chamber (9) is provided with heaters (10) and (11) for heating the article to be treated (16). ) (11) is a cylindrical first heater (10) arranged on the outer peripheral side of the furnace chamber (9) in a plan view and a cylindrical or rod-shaped member arranged in the center of the furnace chamber (9) in a plan view Second heater (11), and a hot isostatic pressing characterized in that a storage section (12) for the article to be treated (16) is provided between the both heaters (10) and (11). Pressure device. 2. A passage (17) communicating with the inside and outside of the heat insulating layer (8) to the top plate portion (6) and the lower portion of the body portion (7) of the heat insulating layer (8) of claim 1.
(18) is provided, and the on-off valves (19) (2
0) A hot isostatic pressurizing device comprising: