JPS5938858B2 - Forging furnace - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heating furnace used to heat forging materials, which has high thermal efficiency and extremely low scale loss.
The object of the present invention is to provide a furnace having a simple structure and high robustness.

Combustion furnace type heating furnaces used to heat forging materials generally require less equipment and fuel costs than induction heating type ones, but they do not allow the flame or combustion gas to come into direct contact with the forging material. As a result, scale generation is significant, resulting in a large amount of material loss, the disadvantage that scale removal work is time-consuming, and there is a risk that many defective forged products containing scale may be produced.

This invention attempts to eliminate the above-mentioned conventional drawbacks,
A hollow cylinder made of refractory material that is slightly thicker than the forging material is installed in the furnace, and the material is fed into this hollow cylinder to indirectly heat the material without directly coming into contact with flame or combustion gas. It is something.

Furthermore, the present invention improves heating efficiency by supporting the hollow cylinder on the front and rear walls of the furnace in a direction extending from the combustion chamber of the furnace main body to the inside of the child door heat chamber. It is a powerful version.

The details of the present invention will be explained below based on one embodiment shown in the drawings.The furnace body 1 has a structure in which a combustion chamber 2 and a child door heat chamber 3 extending horizontally from the combustion chamber 2 are formed. When installing the heavy oil burner 4 at the bottom of the
A flue 6 is connected to the tip of the pipe.

A hollow cylinder 7 serves as a passage for the forging material, has an inner diameter slightly larger than the material to be heated, and is formed from a refractory material (in this example, a silicon nitride-bonded silicon carbide material).

This hollow cylinder 7 is inserted horizontally into the combustion chamber 2 and the child door heat chamber 3 in a direction that extends vertically through these compartments, and its both ends 7a, 7
By supporting b on the front and rear walls of the furnace body 1,
A plurality of rods are installed in the furnace body 1 in several horizontal rows.

The hollow cylinders in each row may be one piece, or two or three hollow cylinders may be joined together. In the illustrated example, two hollow cylinders 7, 7 are used, and their butting ends are engaged with the receiving portions 8, respectively. A portion 9 is integrally formed, and the rain hollow tube 7.7 is connected by engagement between the receiving portion 8 and the engaging portion 9.

Also, one end 7a of each row of hollow cylinders 7 penetrates a through hole 10 bored in the furnace wall next to the flue 6 and protrudes to the outside, and the other end 7b extends through the furnace wall next to the combustion chamber 2. It fits into the provided through hole 11.

Thus, the forging material is fed into the hollow tube T from the end 7a of the flue 6, and is sent out from the end 7b of the combustion chamber 2.

Reference numeral 12 denotes a heat-resistant tube for taking out the material, which passes diagonally through the furnace wall from the through hole 11 and projects to the front surface of the furnace wall.

Reference numeral 13 denotes a lid for opening and closing the heat-resistant tube 12, which is opened and closed by a lever 14.

15 is a plug that closes the through hole 11. A partition plate 16 is erected at the lower part of the child door heat chamber 3, and the partition plate 16 supports the middle part of the hollow cylinder 7.

Reference numeral 11 denotes a partition plate provided at the upper part of the child door heat chamber 3, and its hanging length can be adjusted.

The furnace body 1 can be divided into an upper part and a lower part 1a, and the upper part is further divided into a front part 1b and a rear part 1c, which are connected to each other by a hinge 18.
are connected by

In the above configuration, the forging materials are sequentially inserted into the hollow tube T from the end 7a of the hollow tube 7 that protrudes outside the furnace at the rear end of the furnace body 1, and thereby the materials are sequentially inserted into the other end of the hollow tube 7. Hemuka pushes in.

While the material moves from one end of the hollow cylinder 7 to the other, it is heated by the combustion heat of the burner 4, but since the material is surrounded by the hollow cylinder 7, it does not come into contact with flame or combustion gas. , heated indirectly.

In addition, the material is wrapped in the hollow tube T, and is fed into the furnace through the low-temperature flue 6 and sequentially moved to the high-temperature region, so it is not heated rapidly.

The heated material is pushed by the following material, exits the hollow tube 7, flows down into the heat-resistant tube 12, and can be taken out.

In this invention, a hollow cylinder made of refractory material is installed inside the furnace body as a passage for the material, and since the forging material moves inside the furnace body while being surrounded by the hollow cylinder, the material is exposed to flames and There is no contact with combustion gas, and there is significantly less scale formation.

Furthermore, since the hollow cylinder that serves as a passage for the material is supported at least at both ends by the furnace wall, the support is strong and accidents such as breakage do not occur.

Furthermore, since the hollow cylinder runs through the combustion chamber and the child door heat chamber,
The hollow cylinder continues to be heated until the combustion gas exits the flue, and the combustion heat is used to heat the material without wasting it, resulting in high thermal efficiency.

Moreover, the length of this hollow cylinder is almost equal to the total length of the furnace body, so you can use that length to feed materials one after another.
The heating time can be sufficiently long, allowing continuous and efficient heating.

In addition, since the material is sequentially fed into the furnace from a low-temperature region to a high-temperature region, it is not heated rapidly and there is no risk of producing defective products.

If a hollow cylinder made of silicon nitride-bonded silicon carbide is used, the hollow cylinder has good thermal conductivity and can heat the material to high temperatures, and the hollow cylinder has high hot strength and is resistant to rapid heating and cooling. It has high resistance and can pass through relatively heavy materials.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of the heating furnace of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1...furnace body, 2...combustion chamber, 3...
... Child door heat chamber, 6 ... Flue, 7 ...
・Hollow cylinder, 10, 11... through hole.

Claims (1)

[Scope of Claims] 1. A hollow tube made of a refractory material with an inner diameter slightly larger than that of the forging material is used as a passage for the forging material, and this hollow tube is inserted vertically into the combustion chamber of the furnace body and the child door heating chamber. At least both ends of the hollow cylinder are supported by the front and rear walls of the furnace body, and the forging material is fed from the end of the hollow cylinder next to the flue to fill the combustion chamber. A heating furnace for forging in which the material is taken out from the end. 2. The heating furnace for forging according to claim 1, wherein the material is made of silicon nitride-bonded silicon carbide.