JPH08332550A - Device for applying mold releasing agent for casting belt - Google Patents

Abstract

PURPOSE: To make cooling of a cast billet uniform and to prevent burning and surface flaw by supplying a prescribed quantity of mold releasing agent from a releasing agent tank to an applicator and applying uniform thin film on casting belts. CONSTITUTION: A quantitative pump 12 is adjusted so that the coated film thickness of the mold releasing agent 8 with the felt-like applicator 13 becomes 1-3μm and the mold releasing agent 8 is fed into the applicator 13 from the mold releasing agent tank 11 through suck-up pipes 20A, 20B. The mold releasing agent 8 is uniformly applied in a fixed quantity into thin film while contacting with the casting belts 3A, 3B by driving motor 5. Molten metal 1 is supplied into a tundish 2 from a supplying part 1A and poured into a casting space formed with the casting belts 3A, 3B and dam blocks 4A, 4B to obtain the cast billet 7 solidified by cooling water. At the time of using an oily mold releasing agent 8, the vibration of cooling condition by the coating condition is not developed and the casting quality is improved, and the uniform thin film is coated and the burning and the surface flaw can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release agent coating device for casting belts, and more particularly to a release agent coating device for casting belts, which can greatly improve the quality and casting speed of cast pieces.

[0002]

2. Description of the Related Art As shown in FIG. 3, in a conventional continuous casting apparatus, a molten metal 1 melted in a melting furnace is supplied from a supply section 1A to a tundish 2 and driven by a drive motor 5. It is poured into the mold space formed by the casting belts 3A and 3B and the two right and left rows of dam block chains 4A and 4B,
The poured molten metal 1 is externally cooled by cooling water through the casting belts 3A and 3B and the dam block links 4A and 4B and solidified to cast a cast piece 7. The cast piece 7 that has been cast is continuously discharged from the casting apparatus outlet by the casting belts 3A and 3B.

By the way, in the casting process of the cast piece, there is a phenomenon in which the cast belts 3A and 3B are seized by the heat of the cast piece 7. Conventionally, in order to prevent this seizure,
With the release agent coating device shown in FIG. 3, the casting belt 3A,
3B is coated with a release agent 8 in which fine powder such as ceramics is dissolved in an alcohol solvent. That is, first, the pressure tank 9 containing the release agent 8 is pressurized with the air taken in from the pipe 30, and the release agent 8 is supplied to the two-fluid spray nozzle 10 through the pipes 31A and 31B.
The mold release agent 8 supplied to No. 0 and the air taken in from the pipes 32A and 32B are mixed by the two-fluid spray nozzle 10 and atomized to be applied on the casting belts 3A and 3B.

[0004]

However, according to the conventional mold releasing agent coating device, the mold releasing agent has a heat transfer resistance between the cooling water, the molten metal and the cast piece. For this reason, the cooling conditions change depending on the coating state of the release agent, and the quality of the cast pieces varies. Further, if the film thickness of the release agent is too thick, the cooling ability is lowered, the casting speed is lowered, and the productivity is lowered.
Therefore, in order to improve the casting speed, it is necessary to apply the release agent uniformly to the thin film. However, in the conventional release agent applying apparatus, (1) fluctuation of the air pressure in the pressure tank, The amount of spray is likely to change due to changes in the air amount and air pressure at the spray nozzle, changes in the viscosity of the release agent due to temperature changes, etc.
(2) Since the release agent is applied in the form of spray, the amount of the release agent attached to the cast piece is not constant, and the release agent may be mottled.
Since the film thickness has irregularities, seizure is likely to occur (3)
There is a problem that the mold release agent for preventing seizure is in an excessively adhered state, and the casting speed is remarkably reduced, and it is difficult to uniformly apply the mold release agent to a thin film.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the quality and casting speed of cast pieces by applying a certain amount of a release agent to a casting belt in a thin film and uniformly. It is an object of the present invention to provide a release agent applying device for a casting belt capable of performing the above.

[0006]

In order to achieve the above object, the present invention provides a casting belt release agent applying apparatus for applying a release agent to prevent seizure of a casting belt. A casting belt release agent coating, comprising: a felt-shaped applicator to be applied to the casting belt; and a supply unit that supplies a predetermined amount of the release agent from the release agent tank to the applicator. A device is provided.
In this case, the supply means may be a metering pump.

[0007]

[Operation] By using a felt-like applicator to apply the release agent to the casting belt, a fixed amount of the release agent can be applied.
It can be applied as a thin film and evenly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mold release agent coating device for a casting belt according to the present invention will be described below in detail with reference to the drawings. Figure 1
It is a figure which shows the mold release agent coating device for casting belts which concerns on one Example of this invention. Here, the same parts as those in FIG. 3 are designated by the same reference numerals and symbols, and the duplicate description will be omitted.

This casting belt release agent applying apparatus includes a release agent tank 11 for containing a release agent 8 and a release agent tank 1.
A fixed amount pump 12 for pumping a predetermined amount of the release agent 8 from 1.
It is composed of pipes 20A, 20B for feeding the release agent 8 pumped up to the metering pump 12, and an applicator 13 for applying the release agent 8 fed by the pipes 20A, 20B to the casting belts 3A, 3B. ing.

FIG. 2 is a cross sectional view showing the structure of the applicator 13. As shown in the figure, the applicator 13
Is composed of a holder 14 and a felt 15. The felt 15 is held by a holder 14, and one surface of the felt 15 is pressed against the casting belts 3A and 3B with a constant pressure (not shown).

The application of the release agent 8 to the casting belts 3A, 3B by the casting belt release agent applying apparatus of the present invention having the above-mentioned structure will be described below. First, the metering pump 12 is adjusted so that the coating film thickness of the mold releasing agent 8 by the felt 15 becomes 1 to 3 μm, and the mold releasing agent 8 is pumped from the mold releasing agent tank 11 to the metering pump 12. The release agent 8 drawn up from the metering pump 12 is fed to the applicator 13 by the pipes 20A and 20B. The release agent 8 fed to the applicator 13 is supplied to the felt 15 via the holder 14. Since the felt 15 is pressed against the casting belts 3A and 3B with a constant pressure, the release agent 8 comes into contact with the casting belts 3A and 3B while the driving motor 5 is driven, and a fixed amount of the thin film is formed. It will be applied uniformly. The width W ₁ of the felt 15 is cast piece 7 the width W ₂ of
On the other hand, 1.1W ₂ ≧ W ₁ ≧ 0.9W ₂ is suitable.

The coating film thickness is set to 1 to 3 μm because the casting belt 3 is used when the coating film thickness is 1 μm or less.
This is because the seizure of A and 3B is significantly increased. In other words, if the film thickness is applied in the range of 1 to 3 μm,
The seizure of the casting belts 3A and 3B is not observed, the quality of the cast pieces is improved, and high-speed casting becomes possible. As the release agent, an oil-based release agent or a graphite-based release agent can be considered. Here, an oil-based release agent is used. This is because the graphite-based release agent is likely to cause clogging of the applicator 13 (felt 15) because graphite is present in the solvent in a colloidal state.

As described above, since the oil-based release agent 8 is applied by the felt 15, there is no change in the cooling condition depending on the applied state, and the quality of the cast piece is improved.
Further, since the release agent 8 can be uniformly applied to the thin film, problems such as seizure due to excess and deficiency of the applied state of the release agent 8 or a decrease in casting speed are solved, and productivity is improved.

In the above embodiments, the metering pump is used to supply the release agent to the applicator, but the metering pump is not limited to this, and, for example, a gear pump, a mono pump or another pump may be used. You may use.
Needless to say, it is possible to supply the release agent using a pressure tank as in the conventional case.

[0015]

As described above, according to the mold release agent application device for a casting belt of the present invention, a fixed amount of the mold release agent can be applied to the casting belt in a thin film and uniformly.
Cooling of the cast piece becomes uniform, seizure of the cast piece and the casting belt is eliminated, and scratches on the surface of the cast piece are reduced. As a result, the quality of the cast piece is improved. Further, by applying a thin film, the cooling capacity is improved, the casting speed is improved, and the productivity is greatly improved.

[Brief description of drawings]

FIG. 1 is a bird's-eye view showing a mold release agent application device for a casting belt according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an applicator used in the release agent applying device of FIG.

FIG. 3 is a bird's-eye view showing a conventional release agent coating device for a casting belt.

[Explanation of symbols]

1 Molten Metal 1A Molten Metal Supply Section 2 Tide Dish 3A, 3B Casting Belt 4A, 4B Dam Block 5 Drive Motor 7 Casting Piece 8 Release Agent 9 Pressurizing Tank 10 Two-fluid Spray Nozzle 11 Release Agent Tank 12 Metering Pump 13 Applicator 14 Holder 15 Felt 20A, 20B Tube W ₁ Felt width W ₂ Cast piece width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyoshi Abe 5-1-1, Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Power Systems Co., Ltd.

Claims (2)

[Claims] 1. A mold release agent applicator for a casting belt for applying a mold release agent to prevent seizure of a cast belt, comprising a felt-like applicator for applying the mold release agent to the cast belt, and a mold release agent. A mold release agent coating device for a casting belt, comprising a supply means for supplying a predetermined amount of the mold release agent from a tank to the applicator. 2. The mold release agent application device for a casting belt according to claim 1, wherein the supply means is a metering pump.