JPS58736B2 - heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat treatment apparatus, and particularly to a heat treatment apparatus suitable for performing heat treatment from the inner surface of a tubular object to be heat treated.

Generally, in heat treatment, various heat treatment conditions are employed depending on the material and intended use of the material to be heat treated.

In addition, when a high level of quality is required for a material, heat treatment is performed several times during the processing history of the material, depending on the purpose. It is being done.

Conventionally, when heat treating a tubular body, methods have been adopted in which the entire body to be heat treated is placed in a heat treatment furnace, or a heater, etc. is wound around the outside of the heat treatment area to heat the body, and only the parts that require heat treatment are heat treated. ing.

Furthermore, in conventional heat treatment, the temperature gradient of the object to be heat treated is made as small as possible in the portions outside of the heat treatment required portions.

Therefore, in the conventional heat treatment method, (1) it is impossible to approach the heat treatment part of the heat treatment object from the outside, and (2) there is a cooling part near the heat treatment part of the heat treatment object. If this setting is made, there is a problem in that it is difficult to perform heat treatment satisfactorily.

The present invention has been made in view of the above-mentioned conventional problems, and even when it is impossible to approach from the outside of the object to be heat treated and the heat treatment required part and the cooling required part are close to each other,
It is an object of the present invention to provide a heat treatment apparatus that can perform heat treatment well.

The heat treatment apparatus according to the present invention includes a cylindrical heating section that is inserted into a tubular object to be heat treated, a cooling section that is divided into a plurality of sections in the circumferential direction and connected by elastic bodies, and a periphery of the heating section that is isolated from the outside. and a radially expandable seal portion for sealing inert gas.

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

FIG. 1 is an explanatory diagram conceptually showing a first embodiment of a heat treatment apparatus according to the present invention, and FIG. 2 is an explanatory diagram specifically showing the same heat treatment apparatus. As shown in FIG.
, the cooling section 40 and the heating section 50 are integrated in the axial direction by a support 60, and are inserted into the object to be heat-treated and heat-treated from the inside.

As shown in detail in FIG. 3, the upper seal part 10 and the lower seal part 20 are provided with seal rubber pressers 11 having an outer diameter smaller than the inner diameter of the tube 1 as the object to be heat treated at both ends of the support 600. The presser foot 11 holds a tube-shaped seal rubber 12 which is supplied with a gas inside and can freely expand outward.

A seal rubber fitting 13 is provided inside the seal rubber 12, and a gas pipe 14 is connected to the seal rubber fitting 13.

The gas pipe 14 includes joints 15 and 16, and extends axially inside the support 60 to guide a gas such as helium gas from the outside.

That is, the upper F seal parts 10 and 20 are brought into close contact with the inner wall of the tube 1 by supplying the gas, and form an isolated atmosphere inside the tube 1.

The support 60 in the isolated atmosphere is provided with a gas pipe 80 that opens into the isolated atmosphere from the inside of the support 60, and the gas pipe 80 supplies an inert gas such as helium gas to the atmosphere. During the heating period for the heat treatment area, the isolation atmosphere is made into an inert gas atmosphere to prevent direct oxidation of the heat treatment area and to prevent oxidation of the heating area 50.

- The L section cooling section 30 is installed near the upper seal section 10 and is designed to cool the atmosphere of the upper seal section 10 so that the upper seal section 10 is not damaged by the influence of heat from the heating section 50. It has become.

Further, the cooling section 40 is installed near the heating section 50 and indirectly cools the sections requiring cooling so that the sections requiring cooling other than the sections requiring heat treatment are not heated.

- The cooling pipe 32 connected to the upper cooler 31 of the L cooling part 30 and the cooling pipe 42 connected to the cooler 41 forming the cooling part 40 are opposite to each other as shown in FIG. The cooling fluid flows from the cooler 41 to the upper cooler 31.
It is circulated through and discharged to the outside.

FIGS. 4 and 5 are explanatory diagrams showing the cooling section 4o.

A plurality of coolers 41 (in this embodiment, three coolers) are provided in the circumferential direction.
Each of the divided coolers 41 is divided into upper lid 41
A and a lower lid 41B, which are integrated with each other by a circumferential spring 44 installed in a groove 43 provided on the outer peripheral side surface.

Further, a plurality of holes 45 are provided as flow paths for the cooling fluid of each cooler 41, and the holes 45 are connected to the aforementioned cooling pipe 42 via a joint 46.

Furthermore, a conical inner surface is formed on the inner peripheral side of each cooler 41, and is in contact with an enlargement mechanism 47 that is wedge-coupled with this conical inner surface.

The expansion mechanism 47 connects the support 6 via the plate pin 48.
0 is connected to a sol rod 49 that is movable inside the sol rod 49.

That is, the expansion mechanism 47 allows the cooler 41 to expand and contract in the radial direction by sliding on the inner surface of the cooler 41 in a wedge shape. The diameter is reduced to enable smooth insertion, and during cooling, the diameter of the cooler 41 is expanded to bring the cooling part 40 into close contact with the inner surface of the tube 1, thereby increasing the cooling effect near the part requiring heat treatment.

The spring 44 as an elastic body is stretched when the diameter of the cooling section 40 is expanded, and when the diameter is contracted, each divided cooler 41 is quickly stretched back in the radial direction.

Note that the cooling fluid may be water or the like, but if it is necessary to enhance the cooling effect, a cryogenic fluid such as liquid nitrogen may be used.

As shown in FIG. 6, the heating section 50 includes a cylindrical heat insulating material 51 having an outer diameter smaller than the inner diameter of the tube 1;
It consists of a heater presser 52 embedded in the outer peripheral surface of the heater presser 1, and a heater 53 wound around the heater presser 52, and the heater 53 is connected to an external power source via a heater terminal 54.

The heater 53 has a heating element such as tantalum and an insulating material such as boron nitride or magnesium oxide housed and filled inside, and generates heat by supplying electricity to the heating element to perform heat treatment on the parts requiring heat treatment. They are supposed to do it.

In addition, in order to prevent the coil-shaped heater 53 from losing its shape, it is supported by a heater press 52 made of stainless steel or the like with good heat resistance. Besieged.

Furthermore, in this heat treatment apparatus, when the tube 1 is inserted into the tube 1,
Guide rollers 70 made of a soft material such as Teflon are attached to the upper and lower end surfaces in order to protect the inner wall surface and the cooling section 4o, heating section 50, etc.

The guide roller 70 is arranged in the cooling section 40 and the heating section 5.
It is larger outward than mag. 0.

Next, the operation of the above embodiment will be explained.

A tube plate 2 is connected to the pipe 1 via a welded portion 3, and the welded portion 3
It is difficult to access from the outside, so it is necessary to heat-treat the welded portion 3 from the inner surface of the tube 1.

Furthermore, the inner surface 2A of the tube sheet 2 adjacent to the welded portion 3 is coated and needs to be cooled so as not to be heated during heat treatment of the welded portion 3.

With the guide roller 70 in contact with the inner surface of the tube 1, this heat treatment apparatus is inserted into the tube 1, and the heating section 50 is set at a position corresponding to the weld section 3 as the section requiring heat treatment.

In order to fix this heat treatment apparatus, the lower end opening of the tube 1 and the flange attached to the lower end of the support 60 may be integrated with a fastening screw or the like.

After the heat treatment device is inserted and fixed in a predetermined position of the tube 10 in this manner, gas is supplied to the upper and lower seal portions 10 and 20 to expand the seal rubber 12 and bring it into close contact with the inner surface of the tube 1.

Next, an inert gas is gradually injected into the support 60 through the gas pipe 80, and the air inside is replaced by an inert gas atmosphere 4.
shall be.

In this way, the inner surface of the tube 1 and the heater 53 of the heating section 50 are prevented from oxidizing. First, by pulling the pull rod 49 downward in the axial direction of the tube 1, the expansion mechanism 47 is separated via the plate pin 48. The heat is transmitted to each of the coolers 41 in the pipe 1, and the diameters thereof are expanded to bring the cooling portion 40 into close contact with the inner surface of the tube 1.

When the cooling fluid is supplied from this state, the cooling fluid circulates from the outside of the heat treatment apparatus through the holes 45 provided in the cooler 41 via the cooling pipe 42, and cools the inner surface of the tube 1.

Furthermore, the cooling fluid that has circulated through the cooler 41 is transferred to the cooling pipe 3
2 to the upper cooler 31, and the upper seal part 10
It cools the surrounding atmosphere and is discharged to the outside.

From this state, the heater 53 of the heating section 50 is turned on by the external power supply.
generates heat to heat the welded part 3 as the part to be heat treated from the inner surface of the tube 1.

Here, the external power source is set to a constant state depending on the required heat treatment temperature and required heat treatment time.

According to the above embodiment, when it is impossible to approach the welded part 3 as a heat-treated part of the pipe 1 from the outside, and the inner surface 2A of the tube sheet 2 adjacent to the welded part 3 must be kept cooled. In addition, the inner surface of the tube 1 can be treated under predetermined heat treatment conditions to the portion requiring heat treatment, and the inner surface 2A of the tube sheet 2 adjacent to the portion requiring heat treatment can be maintained at a predetermined cooling temperature.

Next, FIG. 7 is an explanatory diagram showing a second embodiment of the heat treatment apparatus according to the present invention, which differs from the first embodiment in that a centering section 90 is provided near the heating section 50. be.

As shown in FIGS. 8 and 9, the centering section 90 is comparable to the cooling section 40 of the first embodiment, with the cooling passages removed.

That is, the centering section 90 is formed from a centering mechanism main body 91 that is divided into a plurality of parts in the circumferential direction, and an enlargement mechanism 92.

The centering mechanism body 91 is integrated by a circular spring 94 wound around the groove 93, and the expanding mechanism 92 is connected to the pull rod 49 via a plate pin 95.

Note that each centering mechanism main body 91 is sandwiched from above and below by a centering mechanism receiver 96 attached to the support 60.

The action of this centering part 900 is the same as that of the lower part in the first embodiment, so a description thereof will be omitted. By installing this centering part 90 directly above the heating part 50, Together with the provided expansion mechanism for the cooling unit 40, the heating unit 50 can be reliably centered with respect to the pipe 1, and the heating unit 50 can be centered with respect to the pipe 1.
The temperature distribution in the 0 circumferential direction can be made uniform and the heat treatment can be performed satisfactorily.

As described above, the heat treatment apparatus according to the present invention is inserted into a tubular object to be heat treated, and includes a cylindrical heating section, a cooling section divided into a plurality of sections in the circumferential direction and connected by elastic bodies, and a heating section. Since it has a radially expandable seal part that isolates the surrounding area from the outside and seals inert gas, it is impossible to access from the outside and parts that require cooling such as heat treatment parts can be sealed. This has the effect of making it possible to improve the heat treatment of adjacent tubular objects to be heat treated.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of the heat treatment apparatus according to the present invention, FIG. 2 is a cross-sectional view showing the overall structure, FIG. 3 is a cross-sectional view showing the seal portion in detail, and FIG. A sectional view showing the cooling part in detail, FIG. 5 is a sectional view taken along the v-v line in FIG. 4,
FIG. 6 is a sectional view showing the heating section in detail, FIG. 7 is a conceptual diagram showing the second embodiment of the heat treatment apparatus according to the present invention, FIG. 8 is a sectional view showing the concentric section in detail, and FIG. Figure 9 is the ■− of Figure 8.
■It is a sectional view along the line. 10...Top seal part, 20...Each seal part, 30...
Upper cooling section, 40... Cooling section, 50... Heating section, 60...
...The Boat 5,

Claims (1)

[Claims] A heating unit inserted into a tubular body to be heat treated, a cylindrical heating part, a cooling part divided into a plurality of parts in the circumferential direction and connected by elastic bodies, and a part around the heating part isolated from the outside. a radially expandable seal portion that seals an inert gas. 2. The heat treatment apparatus according to claim 1, wherein the heating section comprises an electric resistance heating machine. 3. The heat treatment apparatus according to claim 1, wherein the cooling section is provided with a flow path for a cooling fluid therein. 4. The heat treatment apparatus according to claim 1, wherein the cooling section is wedge-shaped in the axial direction. 5. The heat treatment apparatus according to claim 1, wherein the seal portion is made of an elastic tube.