JPH0379409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heating method and a heating furnace for heating a forging material.

[Conventional technology]

A heating furnace used for hot forging relatively small forging materials has a structure in which a pipe-shaped heating chamber is disposed across the heating furnace.

The above-mentioned heating furnace is an indirect heating furnace that uses a burner to heat the combustion chamber inside the heating furnace, and uses the heat to heat the inside of the heating chamber.To heat the material to the required temperature,
By increasing the length of the pipe-shaped heating chamber and increasing the residence time of the materials, or by installing multiple heating chambers in parallel and taking out the materials supplied to each heating chamber one after another, the retention time of individual materials can be reduced. The furnace time is increased to reach the required temperature.

[Problem to be solved by the invention]

By the way, in the above-mentioned heating furnace for forging materials, the pipe-shaped heating chamber is installed horizontally so as to cross the inside of the heating furnace. Causes significant damage to internal surfaces due to friction.

In addition, since the heating chamber is arranged horizontally,
In order to take out the material supplied into the heating chamber, it is necessary to push the material from the supply port side, and therefore there is a problem in that a material extrusion mechanism must be provided on the supply port side of the heating furnace.

Since the above-mentioned heating furnace indirectly heats the heating chamber, in order to heat the material to the required temperature, it is necessary to increase the residence time of the material in the furnace. If the chamber is made longer, the heating furnace becomes larger and requires a larger installation space.
If a large number of heating chambers are arranged in parallel and the materials supplied into the heating chambers are taken out one after another, the heated materials waiting near the discharge port will radiate heat from the discharge port to the outside of the heating furnace, reducing heating loss. is large.

In addition, in any case in the heating furnace, air enters the heating chamber from the supply port side and the discharge port side of the heating chamber, so that the heated material comes into contact with the air, oxidizes the material, and at the same time generates scale. When this scale occurs, it is necessary to remove the scale, resulting in a large loss of material, and if the scale cannot be removed, there is a risk of producing defective products due to scale encroachment.

The object of this invention is to eliminate the above-mentioned drawbacks, and to make it possible to take out the material supplied into the heating chamber under its own weight.
A heating furnace for forging materials that can prevent the heated material waiting at the outlet side of the heating furnace from radiating heat outside the heating furnace to improve heating efficiency and prevent scale formation. It is to provide.

[Means to solve the problem]

In order to solve the above problems, the first invention provides a passage for the forging material in the combustion chamber of a heating furnace, and the material in the passage is heated indirectly by the combustion chamber from outside the passage and directly heated inside the passage. It was designed to be heated by.

In order to solve the above problems, the second invention provides a cylindrical passage formed in the combustion chamber of a heating furnace with an inner diameter that allows the forging material to pass through, vertically extending from the top to the bottom, and the outlet side of the passage. The structure includes a combustion supply section that combusts the air in this passage.

[Effect]

If the forging material is supplied from the top of the cylindrical passage,
The heated material can be sequentially transferred down the passage by its own weight, and if the fuel is injected from the fuel supply section installed on the outlet side of the passage furnace and mixed with the air that is about to enter the passage, the material can be removed. Since the oxygen near the outlet can be burned, it is possible to prevent scale from forming on the heated material, and since the material can be directly heated, heating efficiency is improved and the heating furnace can be made smaller.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the heating furnace 1 has a cylindrical passage 3 extending vertically through the internal combustion chamber 2 and extending from the upper part of the heating furnace 1 to the outlet 4 at the lower part thereof.

The heating furnace 1 and the passage 3 are formed using a refractory material, and in order to uniformly heat the inside of the combustion chamber 2, a plurality of burners 5, 5' are attached to the heating furnace 1. A fuel supply section 8 is provided at the outlet 4 through which the material 6 is taken out from the heating furnace 1 toward the material discharge port 7 of the passage 3 .

Further, in the combustion chamber 2 of the heating furnace 1, as shown in FIG. There is.

A plurality of pinch rollers 10, 10' are provided at a position below the passage 3 at the outlet 4 of the heating furnace 1, and the pinch rollers 10, 10' move the body toward the outlet 7 by its own weight. It is designed to hold the raw material 6 that has been used and to take out the raw material 6 intermittently when necessary.

In addition, a shielding plate 11 is installed in the combustion chamber 2 of the heating furnace 1 along the longitudinal direction of the passage 3 to partition the combustion chamber 2. This shielding plate 11 allows the inside of the combustion chamber 2 to be uniformly distributed. It has a structure that allows it to heat up quickly.

The burner 5,
5' and indirectly heats the material 6 in the passage 3, and at the same time injects fuel from the fuel supply part 8 provided at the outlet 4, mixes it with the air near the outlet and burns it. The outlet 7 side is directly heated. In this state, if the material 6 is supplied from the supply port 12 of the heating chamber 3, the material 6 will be rapidly heated, and if the heated material 6 is taken out from the port 4, the material 6 in the heating chamber 3 will be heated by its own weight. Move to the discharge port 7 side.
The material transferred from the discharge port 7 to the take-out port 4 is transferred to pinch rollers 10 and 10' provided at the take-out port 4 of the heating furnace 1.
is held in a pinched state by the pinch rollers 10,
By rotating 10', the material 6 heated to a required temperature can be taken out intermittently.

Note that the closer the passage 3 is perpendicular to the installation surface of the heating furnace 1, the more the material 6 can be moved without damaging the inner surface of the passage 3, and if the damage to the inner surface of the passage 3 is reduced, Since the wall thickness of the passage 3 can be reduced, the heating efficiency of the passage 3 can be improved, but it may be arranged horizontally.

Furthermore, the high-temperature combustion gas that has been combusted by the fuel supply section 8 provided at the outlet 4 of the heating furnace 1 flows into the interior from the outlet 7 of the passage 3, so that the oxygen in the passage 3 is combusted. The material 6 can be heated by direct heating, and no scale is generated on the material 6 in the passage 3 due to the combustion of oxygen, so there is no need for descaling work and loss of the material 6 due to descaling can be eliminated. Note that the fuel supply section may be installed inside the lower part of the passage 3.

〔Effect of the invention〕

As described above, according to the present invention, since the passage and the heating furnace are installed vertically from the top to the bottom, when the heated material is moved, it can be moved by its own weight without damaging the inner surface of the passage. Since the fuel supply section is installed on the material outlet side, the injected fuel burns the air in the passage and prevents scale from forming on the material.Moreover, the material in the passage can be heated indirectly and linearly. It can be heated and the heating efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing a heating furnace according to the present invention, and FIG. 2 is a plan view of the same. 1... Heating furnace, 2... Combustion chamber, 3... Passage, 6
...Forging material, 7...Discharge port, 8...Combustion supply section.

Claims (1)

[Scope of Claims] 1. Forging in which a passage for a forging material is provided in a combustion chamber of a heating furnace, and the material in the passage is heated by indirect heating from the outside of the passage by the combustion chamber and direct heating within the passage. How to heat materials for use. 2 A cylindrical passage formed in the combustion chamber of the heating furnace with an inner diameter that allows the forging material to pass through is installed vertically from the top to the bottom, and a fuel supply part that burns the air in this passage is provided on the exit side of the passage. A heating furnace for forging materials.