JPS61246315A - Uniform heating method in radiation heating furnace - Google Patents

Abstract

PURPOSE:To uniformly heat a body to be heated by placing a baffle member between a radiant heat source and the body to be heated so as to partially reduce the quantity of radiant heat applied to the body to be heated from the heat source. CONSTITUTION:A body 3 to be heated is placed at a prescribed position in a radiation heating furnace 1, and radiant heat emitted from a radiant heat source 4 in the furnace 1 is applied to the body 3 to be heated to heat it. At this time, the parts of the body 3 close to the right and left edges of the furnace 1 are heated to a lower temp. than the central part by the effect of the furnace 1. A baffle member 5 is placed between the radiant heat source 4 and the body 3 to be heated so as to reduce the quantity of radiant heat applied to the central part of the body 3. Thus, the body 3 is uniformly heated.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a method for heating an object to a uniform temperature when the object is heated in a radiant heating furnace.

(Prior art) When heating objects over a wide range of objects using radiant heat from a radiant heat source in the above-mentioned furnace, differences in view coefficients due to radiant heat transfer or variations in the amount of heat radiation from one radiant heat source to another are important. Therefore, there is a problem in that the heating temperature of the object to be heated tends to be uneven from place to place.

(Problems to be Solved by the Invention) Except for the above-mentioned conventional problems, this invention is capable of heating objects over a wide range without charge, and in that case, the object to be heated can be kept at a uniform temperature over the entire wide range. The object of the present invention is to provide a soaking method for a radiant heating furnace that can heat a wide range of objects to be heated and perform high-quality heat treatment over the entire area.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) By causing the radiant heat source to generate heat, radiant heat is applied from the radiant heat source to the object to be heated, and the object to be heated is heated. In this case, the amount of radiant heat given from the radiant heat source to the object to be heated is partially reduced by the baffle member located between the radiant heat source and the object to be heated, and the entire area of the object to be heated is approximately evenly distributed. It is heated to a temperature of -.

(Example) Below, drawings showing examples of the present application will be described. 1 is a hollow furnace body that can be sealed inside.
In some cases, a furnace body made of a well-known furnace material or whose inner wall surface is chrome-plated and has a water-cooled structure is used. Reference numeral 2 denotes a place for storing objects to be heated, which is provided inside the furnace body 1, and a tray-shaped surface, for example, is formed there.

3 indicates a heated object placed there. Examples of the heated object 3 include lead frames of electronic components such as transistors and ICs, IC units, etc., and a large number of them are arranged side by side. Reference numeral 4 indicates radiant heat sources arranged above and below the storage location 2 (only the upper side is also possible). These radiant heat a4
As shown in FIG. 2, it is constructed by arranging a plurality of elements 4a and 4b (each of which is 700W, for example) in parallel. An infrared lamp, a far-infrared heater, etc. are used as each element. 5
is a baffle member disposed between the storage location 2 and the radiant heat source 4, which partially reduces the amount of radiant heat given to the storage location 2 from the radiant heat source 4, and in this example, 5US
304 φ0.02 x 6 mesh wire mesh is used. Further, in this example, in order to increase the amount of radiant heat that is frozen near the center of the rod-shaped radiant heat source elements 4a, 4b, two sheets are stacked in that area as shown in FIG. In order to partially change the amount by which the heat radiation is reduced, in addition to changing the number of overlapped wire meshes as described above, the mesh of the wire mesh may be changed at different locations. Furthermore, as the baffle member 5, instead of a wire mesh, a so-called metal semi-transparent mirror made of a glass plate coated with a metal such as aluminum or chromium is used, and a plurality of mirrors are overlapped in some areas to prevent radiation from the radiant heat source. The amount of radiant heat applied to the storage location may be partially reduced, or the transmittance of the metal semi-transparent mirror may be partially varied to vary the amount of radiant heat reduced.

In the above configuration, the radiant heat emitted from the radiant heat source 4 is applied to the heated object 3 placed in the storage location 2, thereby heating it. In this case, in FIG. 1, the heated objects 3 near the left and right edges are influenced by the nearby furnace body 1 and tend to have a lower temperature than the heated objects 3 near the center. By the baffle member 5 disposed between the radiant heat fA4 and the heated object 3, the radiant heat applied to the heated object 3 near the center is reduced, and as a result, the heated object 3 near the edge is reduced.
is given a larger amount of radiant heat than the heated object 3 near the center, and the heated object 3 in the storage location 2 has a substantially uniform temperature over its entire area. The situation is shown in the graph attached to FIG. 1 as follows. That is, for example, in the case of the conventional method in which the baffle member 5 is not used, the object to be heated 3 near the center
The radiant heat source 4 is heated to about 460 @ for example.
When the output is adjusted, the temperature of the heated object 3 near the edge becomes extremely low as shown in the graph. On the other hand, in this embodiment using the baffle member 5,
When the output of the radiant heat source 4 is adjusted so that the heated object 3 near the center is approximately 460', the heated object 3 near the edge is approximately the same as the heated object near the center, as shown in graph A. heated to a certain temperature.

On the other hand, in order to equalize the temperature of the heated object 3 in the left-right direction in FIG. is fine, but you can also do it like this: That is, the power supplied to the radiant heat source element 4b near the edge is transferred to the radiant heat source element 4b in the center.
b, and the amount of radiant heat given from the radiant heat source element 4b at the edge to the heated object 3 at the edge may be made larger than that at the center. Alternatively, the arrangement density of the radiant heat source elements at the edges (the left and right ends in FIG. 2) can be increased to make the amount of radiant heat given to the heated object 3 at the edges larger than that at the center. It's okay.

(Effects of the Invention) As described above, in the present invention, when heating the object to be heated 3, even if the object to be heated 3 is spread over a wide range, the radiant heat source 4 can be used to heat the object to be heated over a wide range. It has the feature of being able to apply radiant heat to the entire area to heat it, and it has the feature of being able to heat objects even if they are arranged over a wide area.

Furthermore, when the object to be heated is heated by leaving it over a wide range as described above, the temperature of the object to be heated 3 may vary depending on the temperature condition of the furnace body 1 or the nature of the radiant heat source at the place where the object is placed 2. Even if there is an uneven situation, the temperature of the object to be heated is uniform over the entire area of the storage location, so that the radiant heat is controlled by the baffle member 5 located between the radiant heat source 4 and the object to be heated. Since the object to be heated 3 is heated by partially reducing the amount of radiant heat given to the object to be heated from the heat source 4, the object to be heated can be heated evenly over the entire area of the storage area. There is.

Furthermore, even if it is possible to apply uniform heat treatment to a wide range of objects 3 as described above, it is simply a matter of simply placing a baffle member 5 between the radiant heat source 4 and the object 3 to be heated. Another advantage is that it can be implemented with an extremely simple configuration.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of a radiant heating furnace, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1...Furnace body, 2...Storage location, 3...Heat object, 4
...Radiant heat source, 5... Obstruction member.

Claims (1)

[Claims] The hollow furnace body is equipped with a storage area where objects to be heated can be stored over a wide area, and a radiant heat source placed opposite to the storage area so as to provide radiant heat to the storage area. In the radiant heating furnace, when applying radiant heat from the radiant heat source to the heated object placed at the storage location to heat the heated object, the temperature of the heated object is maintained throughout the entire area of the storage location. The amount of radiant heat given to the heated object from the radiant heat source is partially reduced by a baffle member positioned between the radiant heat source and the heated object so that the heating of the heated object is uniform. A soaking heating method for a radiant heating furnace characterized by carrying out the following steps.