JPH01129930A - heat treatment furnace - Google Patents

Abstract

PURPOSE:To heat a coil state material to be treated without uneven temp. and to raise it to the prescribed temp. in the heat treatment furnace for short time by constituting the furnace so as to blowing heated atmospheric gas against the coil-state material alternately from one end side and the other end side to axial line direction. CONSTITUTION:By working a fan 21 in a first fan chamber 16, the atmospheric gas heated with a heater 25 is sent in a chamber 14 form laying the material from the chamber 16. The atmospheric gas is blown against the one end side of the material A laid so that the axial line itself in the chamber 14 is faced to the chamber 1 and a second fan chamber 17. By this method, the material A is heated from the one end side thereof. Further, the fan 21 is stopped in the chamber 16 and a fan 22 in the chamber 17 is worked as the above and the atmospheric gas heated with the heater 25 is sent from the chamber 17 to the chamber 14 to blow against the other end side of the material A. By this method, the material is heated from the other end side.

Description

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

(Industrial Application Field) The present invention relates to a heat treatment furnace for a workpiece, and more particularly to a heat treatment furnace for heat treating a workpiece wound into a coil shape.

(Prior art) In a conventional heat treatment furnace, there is an internal space in which atmospheric gas is contained in a hollow furnace body, and there is a storage place for keeping a coil-shaped workpiece and a space for heating the atmospheric gas. The device is equipped with a heater and a fan for stirring the atmospheric gas, and the coil-shaped workpiece placed at the above-mentioned location is heated by the atmospheric gas heated by the heater and stirred by the fan. teeth,
There are problems in that temperature unevenness tends to occur in the object to be processed and that it takes a long time to heat the object to be processed.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, and provides a heat treatment method that can heat an object to be treated with less temperature unevenness, and can raise the temperature of an object to be treated to a predetermined temperature in a short period of time. The idea is to provide a furnace.

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.

(Operation) By operating the fan in the first fan chamber, the atmospheric gas heated by the heater is sent from the first fan chamber into the processing object storage chamber. The atmospheric gas is blown against one end of a coiled workpiece placed in the workpiece storage chamber with its axis facing the first and second fan chambers, thereby causing the workpiece to be The object to be treated is heated from one end thereof. Furthermore, by stopping the fan in the first fan chamber and operating the fan in the second fan chamber in the same manner as above, the atmospheric gas heated by the heater is transferred from the second fan chamber into the workpiece storage chamber. The liquid is sent to the other end of the object to be treated. As a result, the object to be processed is heated from the other end side.

(Embodiments) The drawings showing the embodiments of the present application will be explained below. In the heat treatment apparatus 1 shown in FIG. 1, 2 is a low temperature annealing furnace exemplified as a heat treatment furnace, 3 is a vacuum purge chamber, and 4 is a low temperature annealing furnace.
indicate the entry/exit tables.

In the low-temperature annealing furnace 2, 5 is a hollow furnace body, 6 is an internal space containing atmospheric gas, 7 is an entrance/exit, 8 is a door that can be opened and closed, 9 is an opening/closing device for opening and closing the door 8, and 10
1 shows a conveyance means for conveying the coiled workpiece A. The conveying means 10 is comprised of a large number of rollers 11 provided in the furnace and a busher 12 operated by a cylinder.

Next, the internal space 6 will be explained based on FIG. 2.

Reference numeral 14 denotes a processing object storage chamber for storing a coil-shaped processing object, and one end and the other end are connection ports 14a and 14b, respectively, and inside the processing object A is placed along its axis. A storage location 15 is defined in which the connection port is placed facing the direction connecting both of the connection ports. 16.
Reference numerals 17 indicate first and second fan chambers, which are provided on both sides of the object storage chamber 14, and are connected to the connection ports 14a and 14b of the object storage chamber 14, respectively. be.

18 indicates a heat source chamber, one end 18a communicates with the first fan chamber 16, and the other end 18b communicates with the second fan chamber 11.

In the first and second fan chambers 16.17, 21
Reference numerals 22 and 22 denote fans, respectively, which supply atmospheric gas in the heat source chamber 18 to each connection port 14a in the object storage chamber 14.
, 14b into the processing object storage chamber 14, both of the above-mentioned connection ports 1
Air is blown alternately in the direction connecting 4a and 14b, and drive devices (for example, electric motors) 23 and 24 are connected to each of them.

Next, in the heat source chamber 18, 25 is a heater, 26 is a cooler, and as shown by arrows 258.26a, the heat source chamber 1
The structure is such that atmospheric gas can be circulated in a direction connecting one end and the other end of 8. 27 and 28 are dampers for switching between heating and cooling, and the damper 27 is connected to one vent 25b in the heater 25 and one vent 26b in the cooler 26.
The damper 28 is configured so that the other vent hole 25G in the heater 25 and the other vent hole 26c in the cooler 26 can be opened and closed interchangeably.

Next, 30 is an end portion of the object storage chamber 14 on the side of the first fan chamber 16 and an end portion 18a of the heat source chamber 18.
A first communication path for communicating between the
A damper 32 that can be opened and closed is provided when the fan 21 in the fan chamber 16 is in operation. Next 3
1 is a second fan chamber 1 in the object storage chamber 14;
A second communication path for communicating between the end of the second fan and the other end 18b of the heat source chamber 18, which is opened when the fan 21 in the first fan chamber 16 is operated, and is opened when the fan 21 in the first fan chamber 16 is operated. A damper 33 which can be opened and closed is provided when the fan 22 in the chamber 17 is in operation.

Referring again to FIG. 1, the vacuum purge chamber B is well known and consists of a hollow main body 35, a door 36.degree. 37 that can be opened and closed, a door opening/closing device 38, and the like.

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

A coil-shaped workpiece A placed on a table 4 is placed in a vacuum purge chamber 3 as is well known. The above-mentioned object to be treated A
These require low-temperature convection heating, such as those made by winding a long strip of copper or aluminum into a coil, or those made by winding a wire made of the above-mentioned materials into a coil. In the vacuum purge chamber 3, replacement with atmospheric gas for heat treatment is performed. As the above-mentioned atmospheric gas, a gas suitable for heat treatment of the object to be treated, for example, nitrogen gas is used (air may also be used).

After the atmospheric gas is replaced as described above, the object A is 5'a37. 8 to open the internal space 6 of the annealing furnace 2.
can be placed in That is, it is placed in a storage location 15 in the processing object storage chamber 14, and heat treatment is performed there as described below.

First, as shown in FIG. 2, dampers 27, 28 are switched, and damper 32 is closed and damper 33 is opened. In this state, the heater 25 and fan 21 are operated. In this state, the atmospheric gas heated by the heater 25 is circulated by the fan 21 as shown by the arrow, and the workpiece A in the storage location 15 is heated by the heater toward one end a side in the axial direction. Atmospheric gas is blown onto the surface. As a result, the object to be processed A is of course entirely heated by the heated atmospheric gas, but in particular, one end in the axial direction facing the first fan chamber 16 is heated well. In this case, the heat at one end of the object is transferred inside the object in the axial direction and is transmitted deep into the object. The operation under the above conditions is performed for about 30 minutes, for example.

After the above time has passed, the damper 32°33
is brought into a state as shown in FIG. 3, with fan 21 being stopped and fan 22 being operated. As a result, the atmospheric gas heated by the heater 25 flows as shown by the arrow in FIG. 3, and the object to be processed is particularly well heated at the other end in the axial direction.

In this case as well, the heated heat at the other end is transferred into the object in the axial direction, as in the above case. Heating in this state is also carried out for the same period of time as above.

By repeating the above operations, the object to be processed A is heated to a predetermined temperature, for example, 550° C. (500 to 650° C.), and a soaking process is performed at that temperature. The heating and soaking treatment as described above can be completed in, for example, about 7 hours (conventionally, for example, about 100 hours were required for similar treatment).

Next, when the above heating and soaking process is completed, the heater 25 is stopped and each damper 27.28°32
, 33 are placed in the state shown in FIG.

In this state, the cooler 26 and fan 21 are operated. As a result, the atmospheric gas cooled by the cooler 26 flows as shown by the arrow, and the object to be processed A is cooled. After this condition continues for a predetermined period of time, the dampers 32,33 are then placed in the condition shown in FIG. Then, the fan 21 is stopped and the fan 22 is operated. As a result, the atmospheric gas cooled by the cooler 26 flows as shown by the arrow in FIG. 5, and the object A to be processed is cooled. Such operations are also repeated in the same manner as the heating and soaking described above. By the cooling treatment described above, the object to be processed A is cooled to a temperature such as 60° C. that it will not oxidize even if it is exposed to the atmosphere. The time required for this cooling is, for example, about 4 hours (compared to about 6 hours in the conventional case).

Once the above cooling is completed, it is ready to be processed! l! 71A is taken out through the vacuum purge chamber 3 onto the loading/unloading table 4.

(Effects of the Invention) As described above, in the present invention, a coil-shaped coil is placed in the processing object storage chamber 14 so that its axis faces the first and q-second fan chambers 16 and 17. When heating the workpiece A, atmospheric gas heated by the heater 25 can be blown onto the coil-shaped workpiece A alternately from one end a side and the other end side in the axial direction. It has the advantage of being able to heat the coil-shaped workpiece A with less temperature unevenness.

Moreover, in the case of heating the object to be processed A, even if the object to be processed A is a coil wound with a band plate, inside the object to be processed, both ends a in the axial direction.

Since heat can be transferred from the b side in the axial direction, the heat can be transferred quickly to the center of the object A to be heated to a predetermined temperature in a short period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway view of a heat treatment apparatus, FIGS. 2 to 5 are explanatory diagrams of the operation of a heat treatment furnace (cross-sectional views taken along the line ■-■ in FIG. 1), FIG. 6 is a perspective view of the object to be treated. A... Workpiece, 5... Furnace body, 14... Workpiece storage chamber, 16... First fan chamber, 17... Second fan chamber, 18... Heat source Chamber, 21.22...Fan, 25...Heater, 30.31...Communication path, 32,
33...Damper.

Claims (1)

[Claims] In the internal space of the hollow furnace body, one end and the other end of the chamber serve as connection ports, and a coiled workpiece is left with its axis facing the direction connecting the two connection ports. a processing object storage chamber configured as such, and first and second fan chambers provided on both sides of the processing object storage chamber and individually connected to the connection port at one end and the connection port at the other end, respectively;
A heat source chamber having one end communicated with the first fan chamber and the other end communicating with the second fan chamber and equipped with a heater inside the chamber, the heat source chamber being connected to the first and second fan chambers. are each equipped with a fan configured to alternately blow the atmospheric gas in the heat source chamber from each of the connection ports in the workpiece storage chamber into the workpiece storage chamber in a direction connecting both of the connection ports. Further, the first end of the workpiece storage chamber on the side of the first fan chamber and the one end of the heat source chamber are communicated with each other through a first communication path, and the A second communication path communicates between the end on the second fan chamber side and the other end of the heat source chamber, and the first communication path is connected to the fan in the second fan chamber. The second communication path is provided with a damper that opens when the fan in the first fan chamber is in operation and closes when the fan in the first fan chamber is in operation. A heat treatment furnace comprising a damper that is open and closed when the fan in the second fan chamber is activated.