JP2000301548A - Method for heat treating holding and heat-treating furance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat treat at a lower temperature than a steam temperature of a normal boiling point or above by heating a molding from a surface and substantially perpendicular side face of a laminate structure by heat conduction. SOLUTION: A high temperature member 9 of a heat-treating furnace 1 is previously heated to a predetermined temperature, and the air in the furnace 1 is previously heated by a vapor heater 14. Then, a viscoelastic damper 2 of the structure is conveyed into the furnace, the member 9 is raised, and the damper 2 is started to be heated by heat conduction. When heating is proceeded and the damper 2 arrives at a predetermined temperature, a controller signal processes with a signal from a temperature sensor 16 to drive an air cylinder 10 to lower the member 9. Since the air in the furnace 1 is heated by the heater 14 and the lowered member 9 and held at the predetermined temperature, the damper 2 is held at a predetermined temperature and heat-treated for a predetermined time. Thus, even in the case of a large-sized molding, the molding can be heated in a short time without depending upon more than necessary high temperature, and heated at a uniform temperature with small temperature unevenness in a product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heat-treating a molded article having a laminated structure of a metal layer and a resin layer, and a heat treatment furnace for a molded article suitable for heat-treating such a molded article.

[0002]

2. Description of the Related Art As a technique for protecting a building from disturbances such as winds and earthquakes, a technique for structuring a building using a viscoelastic damper has recently been adopted. The viscoelastic damper used in this building's vibration damping structuring technology has a laminated structure of a metal plate and a viscoelastic resin, and absorbs the energy of displacement between the metal plates using the characteristics of the viscoelastic resin. By doing so, a vibration damping function is obtained. In the manufacturing process of such a viscoelastic damper, a plurality of metal plates and a layer of a viscoelastic resin are laminated,
After forming the main body of the viscoelastic damper, heat treatment is performed to cure the viscoelastic resin to obtain appropriate viscoelastic characteristics. For this heat treatment, an air atmosphere furnace or a steam heating furnace used for heat treatment of general resin products has been used.

[0003]

In recent years, this viscoelastic damper has been actively employed in larger buildings.
Accordingly, many larger viscoelastic dampers having a weight of 500 kg or more have been used. When a general air atmosphere furnace or a steam heating furnace is used to perform heat treatment on such a large molded product, the product is heated to a desired temperature as compared with the case where heat treatment is performed on a conventional small molded product. More time is needed. In order to mass-produce large viscoelastic dampers, a heat treatment apparatus capable of heating a large molded product in a short time is required.

Further, in order to heat-treat such a large-sized product on a large scale on an industrial scale, a steam heating furnace using steam heated by a boiler is advantageous in that energy cost is lower than that of electric heating. It is. However, in the heat treatment of the viscoelastic damper, it is necessary to heat the viscoelastic resin at a temperature of about 70 degrees in order to cure the viscoelastic resin with an appropriate hardness and obtain sufficient viscoelastic properties. In a normal steam heating furnace, the temperature of steam is 100 ° C. or more at normal pressure, and the temperature is too high.

[0005]

According to a first aspect of the present invention, there is provided a method for heat treating a molded article having a laminated structure of a metal layer such as a viscoelastic damper and a resin layer, wherein the molded article is substantially perpendicular to the layer surface of the laminated structure. Heating from the side by heat conduction.

According to the present invention, by directly heating the molded article by the heat conduction of the solid, the speed of heat transfer is increased as compared with the conventional case of heating a gas such as air or water vapor as a heat medium. The molded article can be heated to a desired temperature in a shorter time.

In a molded article having a laminated structure of a metal layer and a resin layer such as a viscoelastic damper, there is a large difference in thermal conductivity between the metal layer and the resin layer. Therefore, in this means, a molded article having a laminated structure of a metal layer and a resin layer is thermally conductively heated from a side surface substantially perpendicular to the layer surface of the laminated structure. In this case, each metal layer constituting the laminated structure is heated from the end by heat conduction. Thus, the applied heat is quickly transmitted to the entire molded article through each layer of the metal layer having high thermal conductivity, and the entire molded article is quickly heated at a uniform temperature.

The present invention is particularly suitable for heat treatment of a viscoelastic damper which is a large molded product in which a temperature difference easily occurs during heating. According to the present invention, since the entire molded article is heated at a temperature nearly uniform, the curing of the viscoelastic thermal resin by heat treatment proceeds uniformly throughout the viscoelastic damper, and the viscoelastic properties of the resin vary from place to place. Risk is reduced.

As an invention of a heat treatment furnace suitable for heat-treating a molded article as described above, a high-temperature member for heating a molded article to be heated, and a heat-conductive member for transferring the high-temperature member to the molded article to be heated. The heat treatment furnace may be provided with a driving device for moving the contact so as to be separated from the heat treatment furnace.

In the heat treatment furnace of the present invention, the high-temperature member is heated in advance before the molded article is put into the heat treatment furnace, and after the molded article is put into the furnace, the high-temperature member is moved to contact the molded article with heat. By doing so, the molded article can be heated quickly. In particular, if a high-temperature member having a large heat capacity is used and the temperature is set slightly higher than the target temperature for heating the molded article, the molded article can be heated in a short time with a sufficient amount of heat.

In the case of heating a molded article by heat conduction, a mechanism for moving a high-temperature member as in the present invention is not used.
For example, it is also possible to adopt a method in which a heat source such as an electric heater is always kept in contact with the molded product, and the temperature is controlled by turning on and off the electricity. However, in such a method, it takes a considerable time for the temperature of the electric heater itself to rise, and since the output of the electric heater is limited, it takes a long time to heat the molded article. If the temperature of the molded article is to be raised quickly, the temperature of the electric heater must be higher than the temperature of the molded article. In such a case, heating will continue for a while after the electric heater is turned off. In addition, an overshoot occurs in which the ultimate temperature of the molded product becomes higher than the target.

According to the present invention, the heat conduction to the molded article can be instantaneously interrupted by moving the high temperature member so as to thermally contact and separate the molded article. Thereby, the heating of the molded article can be quickly and reliably controlled, and if the high-temperature member is immediately separated when the molded article reaches a desired temperature, there is no possibility that the temperature of the molded article will overshoot.

Further, in the above-mentioned heat treatment furnace for molded articles,
A sensor that measures the temperature of the molded article to be heated and a control device that operates the driving device according to the measurement value of the sensor can be provided.

If a temperature sensor is directly attached to the molded article to be heated to measure the temperature, and the measured value is used to control the contact and separation of the high-temperature member using a control device, the temperature of the molded article can be accurately measured. It becomes possible to control. The temperature of the molded product is directly measured by a temperature sensor, and when the molded product reaches a desired temperature, the driving of the high-temperature member is controlled so as to separate the high-temperature member, thereby allowing the molded product to reach the desired temperature in a short time. After heating, it is easy to keep the temperature constant without overshooting the temperature.

It is desirable that the high-temperature member is heated by steam.

[0016] The heating by steam has a feature that the calorific value is large as compared with the heating by electricity and the energy cost is low by boiler cooking. Therefore, a large heat capacity can be obtained economically, and the high-temperature member can have a large heat capacity. This makes it more suitable for quickly heating a large molded product on an industrial scale. One problem with using steam for heating is that the boiling point of water is 1
Since the temperature is 00 ° C., the temperature of the steam becomes 100 ° C. or more at normal pressure, which is not suitable for heating a viscoelastic damper requiring a heating temperature of about 70 ° C. However, according to the present invention, once the high-temperature member is heated by steam, and the heated high-temperature member is brought into contact with and separated from the molded product by heat conduction, the contact and the separation are performed in accordance with the ultimate temperature of the molded product. By controlling, even if a heat source by steam is used, the molded article can be heated to about 70 degrees to control the temperature.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an explanatory view showing the structure of a heat treatment furnace for molded articles according to the present invention. Inside a heat treatment furnace 1 according to the present invention, a viscoelastic damper 2 which is a molded product to be heat treated is provided.
Is installed. The viscoelastic damper 2 has a structure in which the viscoelastic resin 6 is filled between the outer steel plate 3, the inner steel plate 4, and the partition plate 5, and has a laminated structure of a metal layer and a viscoelastic resin layer as a whole. It is. When the viscoelastic damper 2 is used in a building or the like, the outer steel plate 3 and the partition plate 5
, The position of the inner steel plate 4 is relatively displaced, and the energy of this displacement is absorbed by the viscoelastic resin 6, whereby the vibration damping function of the viscoelastic damper 1 is provided. The outer steel plate 3, the inner steel plate 4, and the partition plate 5 are erected outside the furnace on a metal heat transfer assembly jig 7, and the viscoelastic resin 6 is injected and filled between them, and the heat treatment is performed. It is carried into the furnace 1 and placed on the support 8. The viscoelastic damper 2 is subjected to a heat treatment for curing the viscoelastic resin 6 by the heat treatment furnace 1, then carried out of the heat treatment furnace 1, and the heat transfer assembly jig 7 is removed. No external parts are attached to form a viscoelastic damper of the finished product.

Below the heat transfer assembly jig 7 is disposed a high temperature member 9 which comes into contact with and separates from the lower surface of the heat transfer assembly jig 7. The high-temperature member 9 is driven up and down by a pneumatic cylinder 10 via a rod 11, so that the high-temperature member 9 contacts and separates from the heat transfer assembly jig 7. A steam introduction pipe 12 and a steam discharge pipe 13 are attached to the high temperature member 9, and are connected to a steam radiator (not shown) attached inside the high temperature member 9. High-temperature steam is introduced from the outside through the steam introduction pipe 12 to heat the high-temperature member 9, and then discharged outside through the steam discharge pipe 13. A steam heater 14 is connected to the outer wall of the heat treatment furnace 1 so that the outside air is heated by the steam and then introduced into the heat treatment furnace 1. An exhaust pipe 15 is attached to the upper part of the steam heat treatment furnace 1 so that the air inside the heat treatment furnace 1 is appropriately discharged. A temperature sensor 16 for measuring the temperature is attached to the viscoelastic damper 2.

FIG. 2 is an explanatory diagram showing the operation and control system of the heat treatment furnace for molded articles according to the present invention. In the drawing, the steam system used for heating is indicated by a broken line, and the electric system used for measurement and control is indicated by a chain line.

The high-temperature, high-pressure steam introduced from the external steam pipe 17 is branched, one of which is guided to the high-temperature member 9 in the heat treatment furnace 1 through the steam introduction pipe 12 through the diaphragm valve 18b, and the other is the diaphragm. It is led to the steam heater 14 via the valve 18a. After the steam guided to the high-temperature member 9 heats the high-temperature member 9, the steam is discharged to the outside through a steam discharge pipe 13, and the steam guided to the steam heater 14 generates air introduced into the heat treatment furnace 1. It is discharged outside after heating. Viscoelastic damper 2 to be heated
A temperature sensor 16 is attached to the
Are connected to a control device 19. The output of the control device 19 is connected to the air cylinder 10 and the above-mentioned diaphragm valves 18a and 18b.

The heat treatment of the molded article according to the present invention is performed in the following procedure. The high temperature member 9 of the heat treatment furnace 1 is previously heated to a predetermined temperature, and the air in the heat treatment furnace 1 is also preheated by the steam heater 14. Next, the viscoelastic damper 2 is carried into the heat treatment furnace 1,
The high temperature member 9 rises and comes into thermal contact with the viscoelastic damper 2 to start heating the viscoelastic damper 2 by heat conduction. When heating progresses and the viscoelastic damper 2 reaches a predetermined temperature, the control device 19 performs signal processing based on a signal from the temperature sensor 16 and performs signal processing on the air cylinder 1.
By driving 0, the high temperature member 9 is lowered. The air in the heat treatment furnace 1 is heated by the steam heater 14 and the lowered high-temperature member 9 and is maintained at a predetermined temperature. Therefore, the viscoelastic damper 2 is maintained at a constant temperature for a predetermined time. Is performed. If the temperature of the viscoelastic damper 2 falls below a predetermined temperature during the heat treatment, the control device 19 judges the signal from the temperature sensor 16 and raises the high-temperature member 9 again to increase the heat. Heating by conduction is performed. The above diaphragm valve 1
The openings of 8a and 18b are also appropriately controlled by the control device 19 according to the measured temperature of the viscoelastic damper 2.

Although the present invention is particularly suitable for the heat treatment of the viscoelastic damper as described above, the present invention is also applicable to general molded products having a laminated structure of a metal layer and a resin layer. Another example of a molded product having a laminated structure of a metal layer and a resin layer is a seismic isolation isolator.

[0024]

As described above, according to the present invention, in a method for heat-treating a molded article having a laminated structure of a metal layer such as a viscoelastic damper and a resin layer, the molded article is substantially perpendicular to the layer surface of the laminated structure. By heating from the side by heat conduction,
Even large molded products can be heated in a short time,
In addition, heating can be performed at a uniform temperature with less temperature unevenness in the product.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the structure of a heat treatment furnace for molded articles according to the present invention.

FIG. 2 is an explanatory diagram showing an operation and control system of a heat treatment furnace for molded articles according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat treatment furnace 2 Viscoelastic damper 9 High temperature member 10 Air cylinder 16 Temperature sensor 19 Controller

Claims (5)

[Claims] 1. A heat treatment method for a molded article having a laminated structure of a metal layer and a resin layer, wherein the molded article is heated by heat conduction from a side surface substantially perpendicular to a layer surface of the laminated structure. Method. 2. The method according to claim 1, wherein the molded article is a viscoelastic damper having a laminated structure of a metal plate and a viscoelastic body. 3. A heat treatment of a molded article comprising a high-temperature member for heating the molded article to be heated and a driving device for moving the high-temperature member to contact and separate from the molded article to be heated in a thermally conductive manner. Furnace. 4. A sensor for measuring the temperature of a molded article to be heated, a high-temperature member for heating the molded article to be heated, and the high-temperature member contacting and separating from the molded article to be heated by heat conduction. And a control device for operating the driving device according to the measurement value of the sensor. 5. The heat treatment furnace for molded articles according to claim 3, wherein said high-temperature member is heated by steam.