JP2003136543A - Heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating apparatus which can heat an object uniformly. SOLUTION: The heating apparatus 1 has a disk-shaped stainless steel main body 3 in which a through hole 2 for the passage of a molten resin is formed in the vicinity of its center, a band-shaped heater 4 arranged on the periphery of the main body 3, and an annular heat conductor 5 which is formed from a copper-containing metal having higher heat conductivity than that of the main body 3 and arranged in the shape of a concentric circle with the main body part 3 between the through hole 2 and the heater 4. The heater 4 generates heat as a whole when energized. The heat is transmitted to the heat conductor 5 positioned inside the main body 3 through a part of the main body 3 inside the heater 4. After being diffused uniformly radially and in the axial direction in the heat conductor 5 having higher heat conductivity than that of the main body 3, the heat is transmitted to a part of the main body 3 positioned inside, so that a part which is positioned at the innermost circumference of the main body 3 and faces the through hole 2 is heated uniformly without temperature nonuniformity. In this way, the object 6 passing through the through hole 2 can be heated uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device used for heating an injection molding tube die or roller.

[0002]

2. Description of the Related Art As a heating means for an injection molding tube die or roller, a heating device as shown in FIGS. The heating device 50 shown in FIG. 5 is used in the process of manufacturing a cylindrical injection-molded product, and a through hole 52 for passage of molten resin is provided substantially at the center of a disk-shaped main body 51. A band-shaped heater 53 is arranged on the outer periphery of the main body 51. The main body 51 is heated by the heat generated by the heater 53, and the heat continuously heats the fluid such as the molten resin passing through the through hole 52.

Further, in the heating device 55 shown in FIG. 6, a heater 57 is arranged at the center of a disk-shaped main body 56, or a plurality of heaters 58 are arranged so as to surround the heater 57. There are cases where it will be done. In any case, the main body 56 is heated by the heat generated by the heaters 57 and 58, and the outer peripheral portion of the main body 56 is uniformly heated by the heat. Then, by this heating, continuous heating of a roller system can be performed.

[0004]

In the conventional heating devices 50 and 55 shown in FIGS. 5 and 6, the heating heaters 53 and 5 are used.
The heat generation states of Nos. 7 and 58 are not always equal, and in reality, there are unstable portions. This heater 53, 5
When 7 and 58 are unstable, the heating state of the main body portions 51 and 56 becomes non-uniform, resulting in uneven temperature.

When the heating state by the main body portions 51, 56 of the heating devices 50, 55 becomes non-uniform, heat imbalance occurs in the object to be processed on the heating surface, resulting in insufficient flow of fluid such as molten resin, Problems such as accumulation of residual stress in the object to be heated and reduction in sealing force in thermoplastic bonding occur.

An object of the present invention is to provide a heating device for uniformly heating an object to be heated.

[0007]

A heating device according to the present invention comprises a disk-shaped main body having a through hole in the vicinity of the center thereof, heating means arranged on the outer periphery of the main body, and heat conduction higher than that of the main body. A heat conductor that is formed of a material having a refractive index and that is concentrically arranged with the main body portion between the through hole and the heating means.

With this structure, the heat generated by the heating means on the outer circumference of the main body is transferred to the heat conductor inside the main body through a part of the main body located inside the main body. After being uniformly diffused in the radial direction and the axial direction inside the heat conductor with higher thermal conductivity, it is transferred to a part of the main body located inside the heat conductor. The portion facing the surface is heated uniformly without temperature unevenness, and it becomes possible to uniformly heat the heating object such as the molten resin passing through the through hole.

Further, the heating device of the present invention comprises a disk-shaped main body, heating means arranged near the center of the main body,
A heat conductor formed of a material having a higher thermal conductivity than that of the main body is disposed between the heating means and the outer periphery of the main body and concentrically arranged with the main body.

With this structure, the heat generated by the heating means near the center of the main body is transmitted to the heat conductor outside the main body through a part of the main body located outside the main body. After being uniformly diffused in the radial and axial directions within a heat conductor with a higher thermal conductivity than the main body, it is transferred to a part of the main body located outside of it, so that it is located on the outermost periphery of the main body. Will be heated uniformly without temperature unevenness, and it will be possible to uniformly heat the heating object in contact with the outermost periphery of the main body.

Here, by forming the main body portion from stainless steel and forming the heat conductor from a copper-based metal, the heat conductor made of a copper-based metal having a higher thermal conductivity than stainless steel is heated. The heat generated by the means is evenly diffused and then transferred to the stainless steel body, resulting in excellent uniform heating, and a stainless steel body with excellent heat resistance and corrosion resistance provides excellent durability. Demonstrate.

Further, it is desirable that a heat conduction layer in which metal atoms constituting the stainless steel and metal atoms constituting the copper-based metal are diffusion-bonded is provided at a boundary between the main body portion and the heat conductor.

By providing such a heat conducting layer,
There is no room for an air layer to intervene between the heat conductor made of copper-based metal and the main body made of stainless steel, and by eliminating the air layer, the copper-based metal that is the material of the heat conductor is oxidized to form copper oxide. Is no longer generated, and the heat conductor and the main body are in a state of being entirely metal-bonded through the heat conductive layer formed by diffusion bonding, so that the heat generated by the heating means is It is transmitted evenly and evenly to the main body, and excellent uniform heating properties and durability are obtained.

In the heat conducting layer, a heat conductor made of a copper-based metal is accurately and mechanically fitted into a stainless steel body, and the body is evacuated to a temperature of about 1090 ° C. The heat conductive layer that can be formed by slow cooling and is formed by diffusion bonding also has excellent bonding properties, heat conductivity, and durability.

The body is made of austenitic, ferritic or martensitic stainless steel, and the heat conductor is oxygen-free copper or a copper content of 99.9%.
By forming the above-mentioned copper-based metal, it is possible to form a heat conductive layer having excellent bondability, heat conductivity, and durability.

[0016]

1 is a plan view showing a heating device according to a first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG.

The heating device 1 according to the present embodiment is arranged on the outer periphery of the main body 3 and a disc-shaped main body 3 made of stainless steel in which a through hole 2 for passing a molten resin is provided near the center thereof. A band-shaped heater 4 and a ring-shaped heat conductor which is made of copper-based metal having a higher thermal conductivity than that of the main body 3 and is concentrically arranged with the main body 3 between the through hole 2 and the heater 4. And a body 5.

When the heater 4 on the outer periphery of the main body 3 is connected to a power source, the heater 4 generates heat as a whole, and the heat passes through a part of the main body 3 located inside the heater 3 and further heats the heat inside the main body 3. After being transmitted to the conductor 5 and being uniformly diffused in the radial direction and the axial direction within the heat conductor 5 having a higher thermal conductivity than the main body 3, it is further transmitted to a part of the main body 3 located inside thereof. Therefore, the portion located on the innermost periphery of the main body portion 3 and facing the through hole 2 is uniformly heated without temperature unevenness,
The heating target 6 passing through the through hole 2 can be heated uniformly.

In the heating device 1, since the main body 3 is made of austenitic stainless steel and the heat conductor 5 is made of oxygen-free copper, it is made of oxygen-free copper having a higher thermal conductivity than the austenitic stainless steel. The heat conductor 5 of FIG. 3 evenly diffuses the heat generated by the heater 4 and then transfers the heat to the main body 3, whereby excellent uniform heating property is obtained, and austenitic stainless steel excellent in heat resistance and corrosion resistance is obtained. The steel body 3 exhibits excellent durability.

At the boundary between the main body 3 and the heat conductor 5, there is provided a heat conduction layer 7 in which metal atoms constituting austenitic stainless steel and metal atoms constituting oxygen-free copper are diffusion-bonded. There is. By providing such a heat conductive layer 7, there is no room for an air layer to intervene between the heat conductor 5 and the main body 3. Further, by eliminating the air layer, the copper-based metal, which is the material of the heat conductor 5, does not oxidize to generate copper oxide, and the heat conductor 5 and the body 3 are diffusion-bonded to each other. The heat generated by the heater 4 is applied to the heat conductor 5 because the entire surface is metal-bonded through the heat conductor 5.
And the main body 3 are evenly transmitted, and excellent uniform heating property and durability are obtained.

In this embodiment, the heat conducting layer 7
Can be formed by accurately and mechanically fitting the heat conductor 5 into the body 3, heating the body 3 to a quasi-vacuum state up to about 1090 ° C., and then gradually cooling. In addition, since the heat conduction layer 7 is formed by diffusion bonding, it has excellent bondability, heat conductivity, and durability.

In the present embodiment, the main body 3 is made of austenitic stainless steel, and the heat conductor 5 is made of oxygen-free copper. However, the main body 3 is not limited to these. Alternatively, it can be formed of martensitic stainless steel, and the heat conductor 5 has a copper content of 9
It can be formed of 9.9% or more of copper-based metal or the like.

Next, a heating device 10 according to a second embodiment of the present invention will be described with reference to FIGS. The heating device 10 of the present embodiment includes a disc-shaped main body 11 made of stainless steel, a heater 12 arranged at the center of the main body 11, and a plurality of heating units arranged so as to surround the heater 12. The heater 13 and the heaters 12, 13 and the main body 11 made of copper-based metal having a higher thermal conductivity than the main body 11.
The main body 11 and a ring-shaped heat conductor 14 arranged concentrically with the outer circumference of the heat conductor.

The heater 1 near the center of the main body 11
The heat generated by the heat exchangers 2 and 13 is transferred to the heat conductor 14 outside the main body 11 through a part of the main body 11 located outside thereof, and is radiated in the heat conductor 14 having a higher thermal conductivity than the main body 11. After being uniformly diffused in the axial and axial directions, it is transmitted to a part of the main body 11 located further outside thereof, so that the outermost portion of the main body 11 is uniformly heated without temperature unevenness. Therefore, the heating target 15 that is in contact with the outermost peripheral surface of the main body can be uniformly heated.

In addition, the heating device 10 can continuously heat and pressurize as a roller, and by providing a rubber lining, excellent functions and effects are exhibited in applications requiring stable pressurization and heating. Other features,
The effects and the like are similar to those of the heating device 1 of the first embodiment.

[0026]

The present invention has the following effects. (1) A disk-shaped main body having a through hole near the center, heating means arranged on the outer periphery of the main body, the through hole and the heating means formed of a substance having a higher thermal conductivity than the main body. Since the main body and the heat conductor arranged concentrically are provided between and, it becomes possible to uniformly heat the heating target located in the through hole.

(2) The disc-shaped main body, the heating means arranged near the center of the main body, and the heating means and the outer circumference of the main body formed of a substance having a higher thermal conductivity than the main body. By providing the main body portion and the heat conductor arranged concentrically between the main body portion, it becomes possible to uniformly heat the object to be heated in contact with the outermost periphery of the main body portion.

(3) When the main body is made of stainless steel and the heat conductor is made of copper metal, the heat conductor made of copper metal having a higher thermal conductivity than stainless steel is heated. The heat generated by the means is evenly diffused and then transferred to the stainless steel body, resulting in excellent uniform heating, and a stainless steel body with excellent heat resistance and corrosion resistance provides excellent durability. Demonstrate.

(4) At the boundary between the main body and the heat conductor, by providing a heat conduction layer in which metal atoms forming the stainless steel and metal atoms forming the copper-based metal are diffusion-bonded, The heat generated by the heating means is evenly and uniformly transferred between the heat conductor and the main body, and excellent uniform heating property and durability are obtained, and the heat conductive layer formed by diffusion bonding is excellent. Exhibits bondability, thermal conductivity, and durability.

[Brief description of drawings]

FIG. 1 is a plan view showing a heating device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a plan view showing a heating device according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a plan view showing a conventional heating device.

FIG. 6 is a plan view showing a conventional heating device.

[Explanation of symbols]

1,10 heating device 2 through holes 3,11 Main body 4,12,13 heating heater 5,14 heat conductor 6,15 object to be heated 7 Heat conduction layer

Continued front page    F term (reference) 3K092 PP20 QA02 SS12 SS22 SS24                       SS27 TT15 VV22                 4F203 AJ02 AK01 AK09 DA04 DA14                       DB01 DC01 DC13 DD01 DL10                       DM16                 4F206 AJ02 AJ12 AK05 AK09 JA07                       JB02 JL02 JM04 JN14 JN43                       JQ81

Claims (4)

[Claims] 1. A disk-shaped main body having a through hole near the center, heating means arranged on the outer periphery of the main body, the through hole and the through hole formed of a substance having a higher thermal conductivity than the main body. A heating device comprising: a heat conductor arranged concentrically with the main body between the heating means and the heating means. 2. A disc-shaped main body, a heating means disposed near the center of the main body, and a space between the heating means and the outer circumference of the main body formed of a substance having a higher thermal conductivity than that of the main body. And a heat conductor arranged concentrically with the main body. 3. The heating device according to claim 1, wherein the main body is made of stainless steel, and the heat conductor is made of copper-based metal. 4. The boundary between the body and the heat conductor,
The heating device according to claim 3, further comprising a heat conduction layer in which metal atoms constituting the stainless steel and metal atoms constituting the copper-based metal are diffusion-bonded.