JP2001262221A - Method for heating hot forging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency of forging by unnecessitating a process for removing an oxide film needed in the conventional process by removing the oxide film during a heating process even in the case the surface is oxidized when a forging material is heated. SOLUTION: In the method for heating hot forging material, the hot forging material is heated in a fluidized bed furnace and hot-forged thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating a hot forged material, which is used in a pre-process of hot forging and in heating a billet.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional hot forging heating apparatus M for hot forging places a billet (corresponding to "hot forging" of the present invention) B on a conveyor 90 for conveyance. The heating was performed while passing through the atmosphere furnace 80 in the state of being placed, and then the heated billet B was sent to the forging machine. Reference numerals 91 and 91 denote gas burners, which are provided in the atmosphere furnace.
The air in 90 is heated.

[0003]

However, in such a conventional heating method, since the heating is performed in an air atmosphere, the temperature rise is slow, and the billet surface is easily oxidized.
Therefore, as a result of requiring the step of removing the oxide film before forging, there is an inconvenience that it is difficult to improve the work efficiency of the forging operation.

An object of the present invention is to eliminate these disadvantages.

[0005]

In order to achieve this object, a method for heating a hot forged material according to the present invention comprises the steps of:
The hot forging material is heated in a fluidized bed furnace and then hot forged. As a result of heating in the fluidized bed, the surface of the hot forging material is polished even if an oxide film is formed. It is removed by the effect.

If the fluidized bed in the fluidized bed is made of a far-infrared ray generating material, the hot forged material can be synergistically heated by the far-infrared ray effect.

Further, by heating while moving in the fluidized bed, the polishing effect of the fluidized bed is further improved.

[0008]

FIG. 1 is a sectional view of a heating apparatus for heating a hot forging material according to the present invention.

In FIG. 1, M is a heating device, and 10 is a fluidized bed furnace. The fluidized bed furnace 10 has a rectangular parallelepiped cylindrical shape with a reduced diameter at the bottom. Reference numeral 11 denotes an upper end opening of the fluidized-bed furnace F, on which a slide lid 12 is placed. This slide lid
The upper end opening 11 can be opened and closed by sliding the 12.

Reference numeral 14 denotes a heated air supply port,
It is provided at the lower end of 10. Heated gas flows into the fluidized-bed furnace 10 from the heated air supply port 14. Reference numeral 15 denotes a dispersion plate, which is provided at a lower portion of the fluidized bed furnace 10. The dispersion plate 15 supports the fluidized bed 2 and disperses the flowing heated gas into the fluidized bed 2. Here, the fluidized bed 2 is a mixture of alumina and silica or alumina, silica and zirconia, and has a particle size of 50 to 500 μm. For this reason, the fluidized bed 2 has a high specific heat and is hard and has a polishing ability, and furthermore, it is easy to emit far-infrared rays. 16, 16,... Are heating gas bubbles and the fluidized bed 2
To move up inside. The upper part of the fluidized bed 2 in the fluidized bed furnace 10 has an air atmosphere.

Reference numeral 30 denotes a transfer rail, which is installed from one end to the other in the upper part of the fluidized-bed furnace 10. Reference numeral 31 denotes a billet (hot forged material) carrier, which is hung on the carrier rail 30. The billet (hot forged material) carrier 31 is for carrying a billet (corresponding to the “hot forged material” of the present invention) B. It is suspended on the transport rail 30 (the fluidized bed furnace in FIG. 1).
(See left end of 10). At this time, the billet B is buried in the fluidized bed 2. In this state, the billet (hot forged material) carrier 31 is moved to the right by appropriate driving means (when the billet is aluminum, at about 420 to 480 ° C. for 30 to 60 minutes). The billet (hot forged material) B is heated in the fluidized bed 2. And when it arrives at the right end of this fluidized bed furnace 10,
By the operation of 34, the billet (hot forged material) carrier 31 is lifted together with the billet B, and lifted out of the fluidized bed 20 and thus the fluidized bed furnace 10. And it is conveyed to a forging machine.

[0012]

According to the method for heating a hot forged material according to the present invention, the hot forged material is heated in a fluidized bed furnace and then hot forged. The surface of the billet (hot forged material) is removed by the polishing effect of the fluidized bed even if an oxide film is formed.

Therefore, if the method for heating a hot forging material according to the present invention is used, the step of removing the oxide film which has been required conventionally becomes unnecessary, and as a result, the work efficiency of the forging operation can be easily improved. .

When the fluidized bed in the fluidized bed is made of a far-infrared ray generating material, the billet (hot forged material) can be synergistically heated by the far-infrared ray effect.

Furthermore, if the heating is performed while moving in the fluidized bed, the polishing effect of the fluidized bed is further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fluidized bed furnace for heating a hot forged material according to the present invention.

FIG. 2 is a diagram of a conventional example corresponding to FIG.

[Explanation of symbols]

 10… Fluidized bed furnace 2… Fluidized bed B… Billet (hot forged material) M… Heating device

Claims (3)

[Claims] 1. A method for heating a hot forged material, comprising heating a hot forged material in a fluidized bed furnace and then hot forging. 2. The method for heating a hot forged material according to claim 1, wherein the fluidized bed in the fluidized bed is made of a far-infrared ray generating substance. 3. The method for heating a hot forged material according to claim 1, wherein the heating is performed while moving in the fluidized bed.