JPH01159588A - Box for heat treating furnace - Google Patents

Abstract

PURPOSE: To stabilize the quality of an article and save the amount of gas consumption by forming a gas spray hole in an atmospheric gas passage formed along and inner wall of a chamber, and connecting a gas introduction pipe protruding externally of the chamber. CONSTITUTION: A heat treatment chamber 1 is adapted such that an atmospheric gas passage pipe 3 is disposed in a pan shaped chamber member 2 of a heat insulating material, and a gas introduction pipe 4 is jointed with the pipe 3. A gas injection hole 5 is formed which is opened inwardly of the chamber member 2. The gas introduction pipe 4 penetrates the chamber member 2 from the outside of the chamber member 2 and is joined with the pipe 3. Gas introduced from the pipe 4 as indicated by an arrow is injected from the gas injection hole 5 after passage through the pipe 3. Hereby, since an article to be heat treated in the chamber makes contact with fresh atmospheric gas at all times, quality of an article is stabilized. Further, the amount of gas consumption is saved with short time replacement of the atmosphere in the chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat treatment furnace pressure for performing silver baking or resistance baking on ceramic electronic components such as ceramic chip capacitors and ceramic chip resistors.

(Prior Art) Generally, in ceramic electronic components such as ceramic chip capacitors and ceramic chip resistors, silver electrodes and resistive films are baked using a continuous or batch heat treatment furnace.

Conventionally, ceramic electronic components on which silver electrodes and resistive films are baked are placed on a plate-shaped case or housed in a box-shaped case, and heated in a continuous or batch-type heat treatment furnace in a predetermined atmosphere. It was heat treated under

However, as mentioned above, when performing heat treatment using a plate-shaped box or a box-shaped box, there are the following problems: - It is necessary to have a gas-tight structure inside the heat treatment furnace, - It takes time to replace the atmosphere, - It is difficult to secure the atmosphere. A large amount of gas is required; - There is no guarantee that the object to be heat treated is always in contact with fresh atmospheric gas; - In the case of a continuous furnace, it is difficult to divide the inside of the furnace into multiple areas with different atmospheres. There was a problem.

(Objective of the Invention) The object of the present invention is to efficiently perform uniform heat treatment in any atmosphere when performing silver baking or resistance baking on ceramic electronic components such as ceramic chip capacitors and ceramic chip resistors. It is an object of the present invention to provide a heat treatment furnace opening that can be used.

(Structure of the Invention) Therefore, the present invention provides a box that houses a heat-treated object therein and heat-treats the heat-treated object in a heat treatment furnace, wherein the box is supplied with an atmospheric gas along its inner circumferential wall. A passage is formed in the atmospheric gas supply passage, and a gas outlet for spouting atmospheric gas into the box is opened in the atmospheric gas supply passage, and a gas introduction vibrator protruding outward from the box is connected to the atmospheric gas supply passage. It is characterized in that atmospheric gas is supplied from outside the heat treatment furnace to the inside of the box through this gas introduction pipe.

An arbitrary atmospheric gas is supplied from the outside of the heat treatment furnace to the object to be heat treated housed inside the box from the gas outlet through the gas introduction pipe for an arbitrary period of time.

(Effects of the Invention) According to the present invention, since fresh atmospheric gas is always supplied inside the box, the object to be heat treated is constantly in contact with the fresh atmospheric gas, and the quality of the product is stabilized. Atmosphere replacement is completed in a short time, reducing the consumption of atmospheric gas,
Moreover, the atmospheric gas can be easily changed for each temperature range.

(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A perspective view of an embodiment of the heat treatment furnace port according to the present invention is shown in FIG.

The heat treatment box 1 is made of a heat-resistant ceramic material,
A pipe 3 having a circular cross section and serving as a heat-resistant atmospheric gas supply passage is arranged inside a rectangular dish-shaped pressure member 2 made of a metal material, and a gas introduction pipe 4 is connected to this pipe 3. .

The pipe 3 is formed to match the internal dimensions of the pressure member 2. In the pipe 3, gas jet ports 5 that open toward the inside of the pressure member 2 are formed at a predetermined pitch. The gas introduction pipe 4 passes through the pressure member 2 from outside the pressure member 2 and is joined to the pipe 3.

The gas introduced into the gas introduction pipe 4 from one end of the gas introduction pipe 4 passes through the pipe 3 in the mounting member 2 and from the gas outlet 5 formed in this pipe 3, as shown by the arrow Al. , as shown by arrow A, is ejected into the mounting member 2.

Examples of the use of the heat treatment furnace port I shown in FIG. 1 are shown in FIGS. 2 to 4.

The example of use shown in FIGS. 2 and 3 shows an example of use in a continuous heat treatment furnace. On a conveyor belt 7 made of a heat-resistant material, a heat treatment furnace opening l containing an object to be heat treated (not shown) is placed. The heat treatment furnace ports 1 are stacked in one or several stages on a conveyor belt, and the gas introduction pipe 4 of each heat treatment furnace port 1 is connected to the conveyor belt 7 running inside the furnace body 6 of the continuous heat treatment furnace. It projects out of the furnace body 6 through a window 8 provided along it.

The above-mentioned window 8 of the furnace body 6 of the continuous heat treatment furnace of the gas introduction pipe 4
As shown in FIG. 3, one end of an air coupler 9 is coupled to each protruding end of the air coupler 9. As shown in FIG. A gas supply coupler 14 is also connected to the other end of each air coupler 9 . This gas supply coupler 14 is attached to the tip of the gas supply vibrator 13 of the rotary type gas supply device 12 that moves around the rotary joint 11 in the direction shown by arrow A4.

In the rotary gas supply device 12, as the heat treatment furnace port 1 continuously moves in the direction shown by the arrow A3, the gas supply pipe 13 moves in the direction shown by the arrow A4, and the gas supply pipe 13 moves in the direction shown by the arrow A4. Gas is supplied from the gas introduction pipe 4 through the pipe 3 into the tank. As a result, each of the above heat treatment furnace boxes! The heat-treated objects housed in the
As fresh atmospheric gas comes into contact with the heat treatment furnace, the uniformity of the gas atmosphere inside each of the heat treatment furnace boxes increases. Furthermore, the low-pressure type gas supply device 12 makes it easy to switch the atmospheric gas for each temperature range within the furnace body 6 of the continuous heat treatment furnace.

The example of use shown in FIG. 4 shows an example of use in a batch type heat treatment furnace. In this batch type heat treatment furnace, a furnace body 17 is fixed on a base 16, and a hearth 1 of this furnace body I7.
The heat treatment furnace boxes 1 shown in FIG. 1 are stacked in multiple stages on the plywood 18 placed on the plywood 7a via the spacer 18a. The gas introduction pipe 4 of each heat treatment furnace box I projects out of the furnace body 17 through a window 19 provided in the furnace body 17. A gas supply device 21 is connected to a protruding portion of the gas introduction vibe 4 of each heat treatment furnace box 1 from the furnace body 17. Thereby, atmospheric gas is supplied from the gas supply device 21 into each of the heat treatment furnace boxes i, and the objects to be heat treated in each of the heat treatment furnace boxes 1 can be heat treated according to a predetermined temperature increase pattern.

In the embodiment shown in FIG. 1, the vibrator 3 of the heat treatment furnace box 1 may have a rectangular cross-sectional shape. Further, although not specifically shown, the heat treatment furnace box has a vibrator 3 formed in a rectangular frame shape, and has a rectangular heat resistant shape so as to cover the tape 3 formed to match the frame shape. It may have a structure in which the bottom plate is joined to the vibrator 3 and the gas introduction pipe 4 is joined to the vibrator 3.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the heat treatment furnace casing according to the present invention, and FIGS. 2 and 3 are explanatory views of an example of use of the heat treatment furnace casing of FIG. 1 in a continuous firing furnace, respectively. , FIG. 4 is an explanatory diagram of an example of use of the heat treatment furnace box of FIG. 1 in a batch type firing furnace. ■... Box for heat treatment furnace, 2... Box member, 3...
Vibrator, 4... Gas introduction pipe, 5... Gas spout. Patent applicant Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] (1) A box that houses an object to be heat treated inside and heat-treats the object to be heat treated in a heat treatment furnace, wherein the box has an atmospheric gas supply passage formed along its inner circumferential wall, and the box has an atmosphere gas supply passage formed along its inner circumferential wall. A gas outlet for spouting atmospheric gas into the box is provided in the gas supply passage, and a gas introduction pipe protruding outward from the box is connected to the atmospheric gas supply passage. A box for a heat treatment furnace, characterized in that atmospheric gas is supplied into the box from outside the heat treatment furnace.