JPH0480318A - Heat treatment of material - Google Patents

Abstract

PURPOSE:To highly efficiently heat-treat a material with a small setting space by providing a conveyor line below the bottom of a heat-treating furnace having a free-to-close bottom lid and charging a pallet carrying the material into the heat-treating chamber from the bottom. CONSTITUTION:The shapes 2 to be heat-treated under the same conditions are loaded on a pallet 3, moved close to a heat-treating furnace 5 by a main conveyor line 4, transferred on a conveyor line 6 and moved below the furnace 5. The bottom lid 16 of the one among a series of furnaces 5 is lowered and allowed to stand by on the same level as the conveyor line 6, and the shapes 2 are pushed out on the lid 16 along with the pallet 3. A lifting means 25 is driven to wind up a chain 26, hence the lid 16 is raised to close the opening 11 of a furnace body 10, and the pallet 3 and shapes 2 are charged into the furnace body 10. The lid 16 is fixed, and the shape 2 is heat-treated by a heating means 20 under specified conditions. After heat treatment, the fixing means is released, the lifting means is driven in the opposite direction, hence the lid 16 is lowered, and the pallet 3 and shape 2 are discharged from the furnace body 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for heat treating a material to be treated, and more specifically, to a method for heat treating a material to be treated, and more specifically to a method for heat treating a plurality of materials to be treated efficiently according to processing conditions. The present invention relates to a heat treatment method.

[Prior Art] Generally, an extruded section (material to be treated) that has been extruded is heat treated to increase its strength and hardness. for example,
The shapes extruded by the extrusion molding machine are loaded onto pallets and carried into an annealing furnace, and after being heat treated under predetermined conditions, are taken out from the annealing furnace and carried out to a surface treatment process.

In this case, the heat treatment conditions, that is, the treatment temperature and treatment time vary depending on the shape of the material to be treated and the purpose of use.
Heat treatment is carried out under various processing conditions such as 0° C., processing time: 4 hours, (2) processing temperature: 170° C., processing time: 4 hours.

[Problems to be Solved by the Invention] As mentioned above, heat treatment conditions vary depending on the shape of the material to be treated and the purpose of use, and small loft treatment is necessary.
In one large-sized heat treatment furnace, there is a difference between the equipment capacity and the required processing capacity, which tends to result in over-equipment. In order to solve this problem, a method may be considered in which a plurality of heat treatment furnaces are installed in parallel and heat treatment is performed for each small lot, but this method has the problem that the installation area of the heat treatment furnaces becomes large.

Therefore, when the number of heat treatment furnaces is limited and there are many different heat treatment conditions, there is a problem that processing waits occur and processing capacity decreases.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for heat treating a material to be treated, which is characterized by being able to perform heat treatment with high efficiency with a small installation space.

[Means for Solving the Problems] In order to achieve the above object, the method for heat treatment of a material to be treated of the present invention includes a plurality of heat treatment furnaces each having a furnace bottom lid that can be opened and closed, and a method for heat treatment of a material to be treated according to the present invention. A conveyance path is provided at the bottom of the furnace bottom, and pallets loaded with materials to be treated under the same treatment conditions are moved to the conveyance path at the bottom of the furnace bottom of the heat treatment furnace, and the materials and pallets are heat treated from the bottom of the heat treatment furnace. It is characterized in that it is carried into a room, subjected to heat treatment under predetermined conditions in each heat treatment furnace, and then taken out from the bottom of the heat treatment furnace.

In this invention, the bottom cover of the heat treatment furnace may be one that can be opened and closed with respect to the heat treatment furnace, one that can be rotated to open and close with respect to the heat treatment furnace, or one that can be opened and closed up and down with respect to the heat treatment furnace. Although it is possible, it is preferable to use a device that can be raised and lowered to open and close the heat treatment furnace, so that the material to be treated can be carried into and taken out from the heat treatment furnace. In this case, the means for raising and lowering the hearth bottom cover may be any arbitrary means, such as one in which the hearth bottom cover is suspended by a rope such as a chain, and the cord is wound and unwound to raise and lower the hearth bottom cover.
Alternatively, elevating means using a pantograph mechanism, cylinder device, etc. can be used.

[Operation] By configuring as described above, the materials to be treated under the same treatment conditions are loaded on a pallet and moved to the conveyance path at the bottom of the heat treatment furnace, and are also moved to the bottom of a predetermined heat treatment furnace. Then, it is transported into a heat treatment furnace and heat treated under predetermined conditions.
be done. Therefore, materials to be treated under different heat treatment conditions can be heat treated simultaneously or successively, and can be carried out from the bottom of the furnace.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic plan view of a heat treatment apparatus for aluminum extrusion illustrating an example of the method of heat treatment of a material to be treated according to the present invention, and FIG. 2 is a schematic side view of a heat treatment section thereof.

The heat treatment apparatus according to the present invention is located at a position parallel to a runout table 9 on which a long shape (not shown) extruded by an extrusion molding machine 1 runs, and the heat treatment apparatus is arranged to move the long shape to a predetermined size. There is a main conveyance path 4 for conveying the cut sections 2 (materials to be processed) loaded on a pallet 3, and a plurality of conveyance paths (in this case, five case)) The heat treatment furnaces 5a and 5b are connected in series.
...5e and the main conveyance path 4, and the main conveyance path 4 is located below the heat treatment furnaces 5a, 5b...5e.
The main part is constituted by a conveyance path 6 disposed in a direction orthogonal to the conveyance path 6.

Note that the main conveyance path 4 and the conveyance path 6 are each formed by a conveyor. Further, in FIG. 1, reference numeral 7 indicates a billet supply section, and reference numeral 8 indicates a spare die.

As shown in FIGS. 3 and 4, the heat treatment furnaces 5a, 5b, . A box-shaped furnace body 10 having a heat medium supply port 14 and a heat medium discharge port 15 for heating, respectively; a furnace bottom cover 16 that is disposed to be able to rise and fall to open and close the opening 11 of the furnace body 10; This furnace bottom lid 16 elevating means 25, the furnace bottom lid 16 fixing means 17,
The heating means 20 is connected to the heat medium supply port 14 via a supply duct 18 and to the heat medium discharge port 15 via a discharge duct 19.

In this case, the elevating means 25 of the hearth bottom lid 16 is connected to a chain 26 whose one end is connected to each of the four corners of the hearth bottom lid 16, a winding/unwinding drum 27, and a transmission mechanism 28. A drive motor 29 that rotates the drum 27 in forward and reverse directions.
It is made up of. Therefore, by the forward and reverse rotation of the drive motor 29, the furnace bottom cover 16 can be raised and lowered to open and close with respect to the opening 11 of the furnace body 10, and when the opening 11 is closed, the locking fittings constituting the fixing means 17 The closed state is maintained.

Further, the heating means 20 heats the air in the combustion furnace 21 connected to the heat medium supply duct 18 to a predetermined temperature (for example, 90° C. to 250° C.) with the burner 22, and supplies this heated air to the exhaust duct of the combustion furnace 21. The heat treatment furnace 5 is forced to be fed by a fan 23 disposed on the connection side. In addition,
Reference numeral 24 is a drive motor for the fan 23.

Next, the heat treatment method of the present invention will be explained.

Shapes 2 extruded by the extrusion molding machine 1 and subjected to the same heat treatment conditions are loaded onto a pallet 3, and then moved to the side of the heat treatment furnace 5 through the main conveyance path 4, taken over by the conveyance path 6, and transferred to the heat treatment furnace 5. is moved to the bottom of the page. At this time, one of the furnace bottom lids 16 of the plurality of heat treatment furnaces 5 is lowered and is waiting on the same surface as the conveyance path 6, and the pallet 3 and the pallet 3 are placed on the waiting furnace bottom lid 16. The extruded profile 2 is moved.

Then, when the elevating means 25 is driven to wind up the chain 26, the furnace bottom cover 16 rises to close the opening 11 of the furnace body 10, and the pallet 3 and extruded shape 2 are moved to the furnace body 10.
be brought inside. In this state, the furnace bottom cover 16 is fixed by the fixing means 17, and the extruded section 2 is heat-treated by the heating means 20 under predetermined conditions.

After the heat treatment, the fixing means 17 is released and the elevating means 25 is driven in the opposite direction to the above, the furnace bottom cover 16 is lowered and the pallet 3 and extruded shapes 2 are carried out from the furnace body 10, and the next surface treatment is carried out. Transported to the process, etc.

Although the operation of one heat treatment furnace 5 has been described above, other heat treatment furnaces 5 can be operated in the same way, so a plurality of extruded shapes 2, 2, etc. with different heat treatment conditions can be used.
- (Specifically, extruded shapes iY under the same heat treatment conditions) can be heat treated simultaneously or consecutively.

In the above explanation, the case of heat treatment of the extruded shape 2 formed by the extrusion molding machine 1 was explained, but the heat treatment is not necessarily limited to the heat treatment of the extrusion shape 2 formed by extrusion molding, and of course, molding by other molding means is possible. It can be similarly used in the heat treatment of treated materials.

[Effects of the Invention] As explained above, since the present invention is configured as described above, the following effects can be obtained.

1) Since the heat treatment furnace can be installed above the conveyance path, the installation space can be used effectively.

2) Since heat treatment can be performed under different heat treatment conditions using a plurality of heat treatment furnaces installed in series, efficient heat treatment can be performed.

3) Since the material to be treated is carried into the heat treatment furnace from below and subjected to heat treatment, it is possible to improve thermal efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a heat treatment apparatus according to the present invention, and FIG.
The figure is a schematic side view of the heat treatment section in this invention, FIG. 3 is a schematic plan view of the heat treatment furnace in this invention, and FIG. 4 is a schematic side view showing a part of the heat treatment furnace in cross section. Description of symbols (2)...Extruded shape material (3)...Pallet (4)...Main conveyance path (5, 5a to 5e)...Heat treatment furnace (6)...Conveyance path (10) ... Furnace body (11) ... Opening (16) ... Furnace bottom cover (20) ... Heating means (25) ... Lifting means (material to be treated) Patent applicant Nippon Light Metal Co., Ltd.

Claims (1)

[Claims] (1) A plurality of heat treatment furnaces each having a bottom lid that can be opened and closed are installed in series, and a conveyance path is provided at the bottom of the bottom of the heat treatment furnace, and pallets loaded with materials to be treated under the same treatment conditions are transported to the bottom of the heat treatment furnace. Move to the conveyance path at the bottom of the furnace, carry the materials to be treated and the pallet into the heat treatment chamber from the bottom of the heat treatment furnace, heat treat them under predetermined conditions in each heat treatment furnace, and then take them out from the bottom of the heat treatment furnace. A method for heat treating a material to be treated, characterized by: