JPH02637Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a guide rail in an induction heating type electric forging furnace using a high frequency power source.

Conventionally, as guide rails for this type of electric furnace, for example, those shown in FIGS. 1 to 3 are known. In the figure, 1 is an electric furnace, and a heating furnace coil 4 is attached to the outer periphery of an insulating cement tube 3 disposed in the inner hole of a refractory cement frame 2.
The billet 5, which is wound around the billet 5 and transported through the furnace, is heated in stages to reach a high temperature, for example, the forging temperature, near the outlet. Reference numeral 6 denotes a guide rail that slides and supports the billet 5 being transferred inside the electric furnace 1, and two pipes 1 through which cooling water passes.
0 and 10 run in parallel and are arranged from the inlet to the outlet of the electric furnace 1. In the figure, 7 and 8 are the inlet and outlet of cooling water, 12 is a horizontal frame, and 13 is a mounting frame.

The reason why the cooling water is passed through the pipe is that the guide rail 6 itself installed in the furnace is heated at the same time as the billet 5 is heated, and when the billet 5 slides under high temperature, the guide rail 6 comes into contact with the billet 5. In order to prevent this, cooling water is passed through the inside of the pipe to prevent the wear and tear on the surface from becoming significant.

However, in the case of such a conventional guide rail 6, since the cooling water is passed through the inside of the pipes 10, 10, the thermal efficiency of the electric furnace is reduced by the amount of cooling of the pipes 10, 10 by the cooling water. There was a problem. In order to prevent the thermal efficiency of the electric furnace from decreasing, it is possible to use guide rails that do not allow cooling water to pass through, such as round bar rails that run two round steel bars in parallel, and plate rails that use steel bars. In the former round bar rail, there is a problem that the temperature of the round bar rises under high temperatures near the outlet of the electric furnace, and the friction caused by the sliding of the billet 5 is extremely significant and the rail becomes unusable in a short period of time. In addition, the latter plate-shaped rail has a smaller temperature rise under high temperatures than a round bar rail, and is therefore superior to a round bar rail in terms of wear resistance. If the billet is long enough to be laid from the top to the exit, the entire billet will be distorted due to heating in the furnace, and the billet transferred on the top surface of the plate rail will be placed on the deformed rail. There was a problem that the coil 4, which is wound around the outer periphery of the insulating cement tube 3, could be damaged by shaking from side to side, contacting and breaking the inner surface of the insulating cement tube 3.

This invention was made in view of the above, and
The purpose of this invention is to provide a guide rail for an electric furnace that does not reduce the thermal efficiency of the electric furnace and has high wear resistance. The gist of the electric furnace is to consist of a round bar rail disposed between the adjacent round bar rails and a plate-shaped rail connected to the round bar rails and disposed near the entrance of the electric furnace.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

In FIGS. 4 and 5, the main components of the electric furnace 1 are the same as before, including an insulating cement tube 3 disposed in the inner hole of the refractory cement frame 2, and a winding around the outer periphery of the insulating cement tube 3. The heating furnace coil 4 to be rotated and the above-mentioned insulating cement tube 3
It consists of a guide rail 15 that is disposed in the inner hole of the electric furnace 1 and transports the billet 5. However, unlike the conventional method, this guide rail 15 runs from the inlet of the electric furnace 1 to the vicinity of the outlet, as shown in FIG. It consists of a round bar rail 16 disposed between the electric furnace 1 and a plate rail 17 disposed near the outlet of the electric furnace 1. As shown in FIG. 7, the round bar rail 16 is made up of two round steel bars 18, 18 running parallel to each other, and are fixed to each other by horizontal frames 12 at appropriate locations in the longitudinal direction. The plate-like rail 17 connected to the round bar rail 16 has a horizontal bottom surface 19 and side plates 20, 20 erected from both sides of the bottom surface 19, forming a gutter-like shape. The plate-like rail 17 and the round bar rail 16 are connected by means such as welding, and are disposed within the insulating cement tube 3 as an integrated guide rail 15. In addition, 9 in FIG. 4 is a billet tongue chiller roller.

A billet 5 for forging, for example, heated in the electric furnace 1 is transferred on a guide rail by a billet chiller 9, but from the entrance to the vicinity of the exit of the electric furnace 1 is transported by the round bar rail 16. The plate-shaped rail 17 is transferred near the exit of the electric furnace.
During this time, it is heated in stages from room temperature, heated to a predetermined maximum forging temperature near the exit, and then sent out from the electric furnace. At this time, the contact surface of the guide rail 15 is worn out due to the sliding movement of the billet 5 that is being slid, but the round bar rail, which easily rises in temperature, is arranged between the relatively low-temperature parts, and the plate, which is less likely to rise in temperature, is Since the shaped rail is placed near the outlet of the high-temperature zone, wear resistance is significantly improved compared to when a round bar rail is used alone, and the distortion and deformation that occurs when a plate rail is used alone is avoided. Does not occur. Note that unlike the conventional guide rail, the guide rail according to this embodiment does not use cooling water, so there is no risk of reducing the thermal efficiency of the electric furnace. In this example, the power supply is 3KHz, the furnace length is 2080mm, and the outlet temperature is
Although an electric furnace at 1200℃ is used, experimentally the temperature decreases by about 8%.
Energy saving effects have been achieved. In addition, in this example, the length of the plate rail arranged near the outlet is 300 mm, but experiments have shown that the wear resistance of the entire guide rail is comparable to that of conventional pipe rails that use cooling water. It has been obtained.

As explained above, according to the present invention, the guide rail disposed inside the electric furnace is connected to the round bar rail disposed between the inlet and the exit vicinity, and the electric furnace Since the guide rail is configured with a plate-shaped rail disposed near the exit, it is possible to provide a guide rail that has better wear resistance than conventional guide rails without causing a decrease in thermal efficiency.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing a conventional electric furnace, Figure 2 is a cross-sectional view taken along the - line in Figure 1, Figure 3 is a plan view of the guide rail in Figure 1, and Figure 4 is an electric furnace according to the present invention. 5 is a cross-sectional view taken along the line -- in FIG. 4, FIG. 6 is a plan view of the guide rail in FIG. 4, and FIG. 7 is a partial perspective view of the guide rail according to the present invention. 1... Electric furnace, 3... Insulating cement tube, 4... Coil for heating furnace, 5... Billet,
6, 15...Guide rail, 16...Round bar rail, 17...Plate rail.

Claims (1)

[Scope of utility model registration request] In an electric furnace in which a coil is wound around the outer periphery of an insulating cement tube and a guide rail for transferring the billet is arranged inside, the guide rail is a round bar arranged between the inlet and the outlet of the electric furnace. 1. A guide rail for an electric forging furnace, comprising a rail and a plate-shaped rail connected to the round bar rail and disposed near the outlet of the electric furnace.