JPS603511Y2 - Skid rail for induction heating coil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a skid rail for an induction heating coil, and more particularly, to a skid rail for a heating coil of an induction heating device that heats a billet made of a round or square bar cut into short lengths.

Generally, when these billets are heated by an induction heating device, the billets are continuously fed onto a skid rail placed in the heating coil of the induction heating device in its longitudinal direction.
Pusher or pinch roller
A method of pushing forward is adopted.

In this case, in order not to reduce the strength, durability, etc. of the skid rail, the rail is used as a pipe and cooling water is passed through its hollow portion.

Therefore, in such skid rails, a problem arises in that the billet cannot be uniformly heated.

To be more specific, as shown in the cross-sectional view in FIG. 1, the conventional skid rail for induction heating has a rail 2 formed of a pipe inside a heating coil 1, and a heated object is placed on the rail 2. The billet 3 is configured to slide.

Then, by passing cooling water into the rail 2, the rail 2
This prevents the temperature from rising and prevents a decrease in strength, durability, etc.

However, according to such a configuration, the billet 3 is connected to the rail 2.
A temperature drop occurs at the portion 4 in contact with the billet 3, thereby reducing the quality of the forged product, for example when the billet 3 is sent to the next forging process.

As a means of solving this problem, it has been proposed to form a coating layer made of a voltage-resistant, heat-resistant, heat-resistant insulation, and wear-resistant material such as a ceramic material over the entire outer peripheral surface of a rail formed from a pipe by thermal spraying. ing.

However, this coating layer by thermal spraying can usually only be formed to a thickness of 1 m/m or less, which not only does not provide sufficient heat insulation effect, but also reduces durability due to thermal distortion caused by the thermal gradient between the rail and the coating layer. This resulted in a significant loss in performance, and there were various problems such as the inability to withstand long-term use, and the product could not be put to practical use.

The present invention has been devised in view of the above, and includes an outer periphery of a pipe through which cooling water passes through a hollow part, a heat insulating material is attached to the inner wall in the longitudinal direction of the pipe, and a flange is provided on the inner periphery of both ends. It is an object of the present invention to provide a skid rail for an induction heating coil equipped with a plurality of tubes.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

In these figures, the same reference numerals as in FIG. 1 indicate the same names.

In FIG. 2, a rail 2 formed of a pipe is disposed inside the heating coil 1, and the rail 2 is equipped with an outer tube 5, and the billet 3 is slid on the outer tube 5. It has become.

As shown in FIGS. 3 and 4, the exterior pipe 5 includes a short pipe 6 having a diameter larger than that of the rail 2 and having chamfered outer circumferences at both ends, and a heat insulating material 7 attached to the inner wall of the short pipe 6. and the short pipe 6
and a collar 8 provided on the inner periphery of both ends thereof and holding the heat insulating material 7.

Since the outer tube 5 is preferably non-magnetic and heat resistant, for example, the short tube 6 and the collar 8 are made of nickel chrome superalloy (equivalent to JIS NCF IB), and the heat insulating material 7 is made of asbestos or the like. Firebrick etc. are used.

Reference numeral 9 represents a stopper for maintaining the position of each outer tube 5.

5A and 5B show other embodiments of the outer tube 5, in which FIG. 5A shows a short tube 6, and FIG.
A slit 10 is provided in each of the heat insulating material 7 and the heat insulating material 7.

As explained above, the skid rail for the induction heating coil is equipped with:
Since it is possible to provide a sufficient space between the forged products and the heat insulating material 7 is interposed therebetween, a heat insulating effect can be obtained and the quality of the forged product can be improved.

2. Since the exterior tube 5 is divided into a plurality of parts, thermal distortion can be prevented, thereby improving durability.

3. Since the heat insulating material 7 is held by the brim 8, wear and tear of the heat insulating material 7 can be prevented.

4 If a slit 10 is provided in the short pipe 6 and the insulation material 7, the short pipe 6
It is possible to further prevent thermal distortion in which heat generation due to induction heating is reduced, and the durability of the exterior tube 5 can be further improved.

It has many advantages such as, and is extremely advantageous industrially.

Of course, the present invention is not limited to the above embodiments.

Therefore, it is clear that various changes can be made without departing from the gist of the invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the inside of a heating coil of an induction heating device having a conventional skid rail, and FIGS. 2 to 5 illustrate an embodiment of the skid rail according to the present invention.
The figure is a cross-sectional view of the inside of a heating coil having a skid rail according to the present invention, FIG. 3 is a partial vertical cross-sectional view of the skid rail according to the present invention, FIG. Diagram a
, b are cross-sectional views showing other embodiments of the skid rail. 1...Heating coil, 2...Rail, 3
...Billet, 4...Temperature reduction section, 5
...Exterior pipe, 6...Short pipe, 7...
...Insulation material, 8...Brim, 9...Stopper 10...Slit.

Claims (1)

[Scope of utility model registration request] The outer periphery of a pipe through which cooling water passes through a hollow part, and the pipe is characterized by being equipped with a plurality of outer pipes having a heat insulating material attached to the inner wall and having flanges on the inner periphery of both ends in the longitudinal direction of the pipe. Skid rail for induction heating coils.