JPH0326637Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention applies a high temperature of approximately 1500°C to a workpiece such as powdered sintered metal stored in a heating furnace inside a high-pressure container.
This invention relates to a heater for a hot isostatic press machine that applies high pressure of about 2000 atmospheres to pressure-form the processed product.

(Prior Art) In the heating furnace incorporated in the high-pressure container of the hot isostatic press device, it is necessary to make the temperature inside the furnace uniform in order to obtain a molded product with stable quality.
In a conventional hot isostatic press apparatus, the heater shown in FIG. 1 is used.

(Problems to be Solved by the Invention) The conventional heater shown in FIG. There was a problem. That is, () the spiral groove b must be bored in the rod-shaped insulating material a, which makes processing the rod-shaped insulating material a troublesome. In addition, the spiral heating element c is connected to the spiral groove b.
They must be inserted into each other, making it troublesome to assemble each other and increasing the manufacturing cost of the heater.

() Also, the depth and width of the spiral groove b of the rod-shaped insulating material a, and the pitch of the spiral determine the wire diameter and winding pitch of the spiral heating element c, and these dimensions cannot be determined freely. There was a problem.

The present invention is proposed in view of the above problems, and its purpose is to reduce manufacturing costs. Another object of the present invention is to provide a heater for a hot isostatic press machine in which the wire diameter, winding pitch, etc. of the heating element can be freely selected.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a rod-shaped insulating material installed upright inside a high-pressure container along the inner peripheral surface thereof, and a spiral insulating material arranged around the rod-shaped insulating material. In a heating heater for a hot isostatic press machine, which comprises a helical heating element wound around the rod-shaped insulating material, cut grooves are provided on the outer circumferential surface of the rod-shaped insulating material at predetermined pitches so as to intersect with the axis of the rod-shaped insulating material. A part of the wire of the spiral heating element is engaged with each of the notched grooves, and both ends of the notched portion are brought into contact with the same wire.

(Function) The heater for a hot isostatic press device of the present invention is constructed as described above. First, a workpiece to be processed is inserted into the heating furnace, the heating furnace is closed, and then the heating furnace is placed in a high-pressure container. the high-pressure vessel is closed, and then high-pressure gas is supplied into the high-pressure vessel and the heating furnace to pressurize the inside of these to high pressure, and the spiral heating element is energized to generate heat. , the inside of the heating furnace is heated to a high temperature, and the product to be processed is pressure-molded.
At that time, a part of the wire of the spiral heating element is cut into grooves (cut grooves are formed on the outer peripheral surface of the rod-shaped insulating material at predetermined pitches, intersecting with the axis of the rod-shaped insulating material).
At the same time, both ends of the notch are in contact with the strands of the spiral heating element, so even if the spiral heating element stretches under high temperature, it will not slide downward. Contact with each other and short circuits are prevented.

(Embodiment) Next, the heater for a hot isostatic press apparatus of the present invention will be explained using an embodiment shown in FIGS. 2 to 5. In FIG. 2, 1 is a high-pressure vessel; 3 is a lower lid that is removably inserted into the lower part of the high-pressure container 1; 4 and 5 are gaskets that are attached to the upper lid 2 and the lower lid 3; 6; is a heating furnace, and the heating furnace 6 is composed of a heating furnace outer plate 7, a heat insulating material 8, and a reflecting mirror 9 made of molybdenum.

Further, numeral 10 denotes a heater that is the most characteristic feature of the present invention, and there are a plurality of heaters 10, each of which is composed of a spiral heating element 11 made of molybdenum wire and a rod-shaped insulating material 12. Cutout grooves 13 are provided on the outer peripheral surface of the rod-shaped insulating material 12 at the winding pitch P of the spiral heating element 11, and a portion of the wire of the spiral heating element 11 engages with these notch grooves 13. At the same time, both ends of the notched groove 13 come into contact with the strands of the helical heating element 11, and the helical heating element 1
1 is held so as not to fall off the rod-shaped insulating material 12.

Further, 20 is a spiral heating element 1 of each heater 10.
The upper ends of these spiral heating elements 11 are attached to the top of the reflective plate 9 via an upper ring 21.

Further, reference numeral 19 denotes a connection terminal on the lower lid 3 side that contacts the electrode rod extending downward from the lower ring 20;
9' is a connection terminal on the lower lid 3 side that contacts a portion extending downward from the reflector plate 9; 14 is a connection terminal on the heating furnace 6;
The hearth installed on the lower part of the insulation material 8a, 15
16 is a high-pressure gas supply pipe passing through the upper lid 2; 17 is a high-pressure gas passage provided at the lower end of the heating furnace outer plate 7; is the lower part 7 of the heating furnace outer plate 7
a and the lower part 8a of the heat insulating material 8, and the high pressure gas passage 18 has a check valve that only allows the high pressure gas to enter into the heating furnace 6.
Illustrations are omitted.

Also, a part of the heating furnace 6, for example, the lower part 7a, 8
a is configured to be partially openable and closable, and when this part is opened, the hearth 14 of the heating furnace 6 for the workpiece is exposed.
Although it is possible to place the heating furnace 6 on top or take it out from the hearth 14 of the heating furnace 6, a detailed explanation on this point is also omitted.

Next, the operation of the heater for the hot isostatic press shown in FIGS. 2 to 5 will be specifically explained. When the upper lid 2 and the heating furnace 6 are outside the high-pressure vessel 1, a part of the heating furnace 6 is opened, a workpiece to be processed is placed on the hearth 14 of the heating furnace 6, and a part of the heating furnace 6 is opened. Close it and begin the heat forming process. That is, the upper lid 2 and the heating furnace 6 suspended and supported by the upper lid 2 are inserted into the high-pressure vessel 1, and the upper part of the high-pressure vessel 1 is closed with the upper lid 2. At this time, the lower ring 12
The electrode rods a and 12b are connected to the connection terminal 1 on the lower lid 3 side.
9, 19, and the lower end of the reflector 9 is in contact with the lower lid 3.
contact terminal 19' on the side.

Next, high-pressure gas is supplied from the high-pressure gas supply pipe 16 through the high-pressure gas passages 17 and 18 into the heating furnace 6 to pressurize the inside of the high-pressure container 1 and the inside of the heating furnace 6 to a high pressure of about 2000 atmospheres.

At the same time, electric power is supplied to the connection terminal 19 → lower ring 20 → spiral heating element 11 → reflection plate 9 → connection terminal 19'. Furthermore, the amount of power supplied is controlled to heat the heating furnace 6 to a uniform temperature of about 1500°C.

As a result, the product to be processed is pressure-formed, but once the pressure-forming is finished, the interior of the high-pressure container 1 and the heating furnace 6 are cooled and the high-pressure gas is discharged by appropriate means to restore the product to its original state. Then, the upper lid 2 and the heating furnace 6 are taken out of the high-pressure vessel 1, and the pressure-molded product is taken out from the heating furnace 6.

(Effect of the invention) As described above, the heater for a hot isostatic press apparatus of the present invention includes a rod-shaped insulating material 12 erected along the inner peripheral surface of the high-pressure container 1, and a surrounding area of the rod-shaped insulating material 12. In a heater for a hot isostatic press machine, which is composed of a heating element 11 spirally wound around a heating element 11, cut grooves 13 are formed on the outer peripheral surface of a rod-shaped insulating material 12 at predetermined pitches P relative to the axis of the rod-shaped insulating material 12. The wires of the helical heating element 11 are provided in an intersecting state so that a part of the wire of the spiral heating element 11 is engaged with each notch groove 13, and the notch 13
Both ends of are in contact with the same strand, and the following effects can be achieved. That is, (i) the above-mentioned conventional method in which the notch groove 13 can be formed by selecting an easy-to-process position on the outer circumferential surface of the rod-shaped insulating material 12, and a spiral groove is bored on the entire circumferential surface of the rod-shaped insulating material; Compared to this, the rod-shaped insulating material 12 can be processed easily.

(ii) A part of the wire of the spiral heating element 11 is cut into each notch groove 1.
3, it is sufficient to engage the spiral heating element 11
Compared to the conventional method in which the entire strand of wire is inserted into the spiral groove, the spiral heating element 11 and the rod-shaped insulating material 12 can be easily assembled,
Coupled with the ease of processing as described above, the manufacturing cost of the heater can be reduced.

(iii) A part of the wire of the spiral heating element 11 is cut into each notch groove 1.
3, and both ends of the notch 13 are brought into contact with the wires of the helical heating element 11, so that even if the helical heating element 11 stretches under high temperature, the helical heating element 11 will not be partially extended. This has the effect of preventing the spiral heating elements 11 from coming into contact with each other and from short circuiting.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional heater for a hot isostatic press machine, Fig. 2 is a vertical side view showing an embodiment of the heater for a hot isostatic press machine according to the present invention, and Fig. 3 is a side view showing a conventional heater for a hot isostatic press machine. 4 is a side view showing an enlarged view of the main part thereof, FIG. 4 is a longitudinal sectional side view taken along the arrow line in FIG. 3, and FIG. 5 is a cross-sectional plan view. 1... High pressure container, 10... Heater, 11...
...Spiral heating element, 12... Rod-shaped insulating material, 13...
Notched groove.

Claims (1)

[Scope of utility model registration request] In the heater for a hot isostatic press machine, the heating element comprises a rod-shaped insulating material erected along the inner circumferential surface of the high-pressure container, and a spiral heating element wound spirally around the rod-shaped insulating material. Notch grooves are provided on the outer peripheral surface of the rod-shaped insulating material at predetermined pitches so as to intersect with the axis of the rod-shaped insulating material, and a portion of the wire of the spiral heating element is engaged with each of the notched grooves. Also, a heater for a hot isostatic press apparatus, characterized in that both ends of the notch are in contact with the same strand.