JP3114781B2 - Release material application device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for attaching a release material to a mold used for producing a metal ingot such as gold by a melt casting method.

[0002]

2. Description of the Related Art Conventionally, when a metal ingot such as gold is produced by a melt casting method, a high-temperature molten metal is cast into a mold, so that the mold is eroded by the molten metal. As a countermeasure against this, a mold release material is often applied to the inner wall surface of the mold in contact with the molten metal.

[0003]

When a mold release material is applied to the inner wall surface of a mold, a method of adhering soot generated by incomplete combustion of kerosene to the mold surface is generally used. However, since kerosene is a liquid, it is necessary to prepare a core material when burning it and to impregnate and burn the core material. There is also a method of spraying a release material, as described in JP-A-1-239384. However, since a burner for drying the sprayed release material is required, this method is not suitable for automating this step.
In addition, there is a method of applying a paste-like release material containing ceramic particles, but in this method, when the release material is dried, the release material is not uniform and has many irregularities,
The resulting ingot also had the disadvantage that the gloss of the surface in contact with the mold was poor.

Accordingly, it is an object of the present invention to provide a process for attaching a mold release material to a mold when producing a metal ingot of gold or the like, in which the degree of erosion of the mold is extremely small, the surface condition of the obtained ingot is good, and the mold is released. Is to provide a device for attaching a release material to a mold, which can simply and automatically automate the process.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a base member on which a mold is placed and a mold having a shape substantially equal to the outer shape of a casting surface of the mold placed on the base member. A hood having a cross section and disposed directly above a mold to which a release material is to be attached; an acetylene gas burner which is guided into the hood and has a tip directed toward the mold; and a tip of the acetylene gas burner An electric heater for ignition for igniting acetylene gas arranged in the vicinity of the acetylene gas, and a flame sensor for monitoring the flame of the acetylene gas flowing out of the acetylene gas burner. To adopt.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In consideration of a release material adhering device, the idea is that gaseous release material material is more likely to be able to automate the device more simply in terms of transfer and control than liquid release material material. An experiment was conducted to determine whether various types of hydrocarbon gases were effective as mold release materials. For example, when propane gas was used, the release material was unevenly adhered, but when acetylene gas was used, fine soot was generated and adhered evenly to the mold surface, and a metal ingot obtained by casting was used. Has a glossy surface and is in a good condition, and found that acetylene gas is the best gaseous release material as far as the present inventors know at present. Therefore, the present invention uses acetylene gas as a raw material for generating soot as a release material.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an embodiment of the release material applying apparatus of the present invention with a part of the apparatus removed, and FIG. 2 is a plan view of the release material applying apparatus also showing a part of the apparatus removed. FIG. 3 is a side view of a release material applying apparatus suitable for applying a release material to a large number of molds.

1 to 3, a horizontal cross section of a hood 1 is substantially the same as the outer dimensions of a mold 2 placed on a base portion 4, and the lowermost end of the hood 1 is located immediately above the mold 2. The upper end is connected to the smoke exhaust pipe 3. An acetylene gas burner 5 is introduced from the side wall of the hood 1 into the hood 1 such that the crater thereof faces the casting surface of the mold 2. In the vicinity of the crater of the acetylene gas burner 5, an ignition heat transfer heater 6 having a coil part to be glowed is also introduced into the hood 1. A slightly large opening 10 is formed in the side wall of the hood, and a flame sensor 7 is arranged so that the ignition state of the acetylene gas burner 5 can be monitored through the opening.

A photoelectric sensor 8 for detecting whether or not the mold 2 has been inserted under the hood 1 is provided near the lowermost end of the hood 1.

Next, the operation of the release material attaching apparatus of the present invention will be described. When the mold 2 is inserted between the lowermost end of the hood 1 and the base 4, an electromagnetic valve (not shown) arranged in the acetylene gas pipe is operated, and acetylene gas is ejected from the acetylene gas burner. At this time, the tip of the electric heater 6 for ignition contacts the coil portion which is always red hot and is ignited, and the generated soot reaches the inside of the mold 2 and adheres to the inside to form a release material layer. At the same time, the generated exhaust gas is exhausted by an exhaust gas fan (not shown) through the smoke exhaust pipe 3. The supply of acetylene gas is stopped after a predetermined time has elapsed by setting a timer for an electromagnetic valve by a controller (not shown).

In the embodiment shown in FIG. 3, a rodless cylinder 9 is provided below the base 4, and when the rodless cylinder 9 is operated, it is connected to the rodless cylinder 9 and formed on the base 4. A push pin projecting upward through a longitudinal opening (not shown) is
Move in the longitudinal direction. For this reason, the molds arranged and placed on the base portion 4 are sequentially pushed and brought to the release material attaching position, inserted between the hood 1 and the base portion 4, and sooted as described above.

At this time, it is determined whether or not the mold is at the release material attaching position by using the photoelectric sensor 8, and a patent application (Japanese Patent Application No. 5-187406) filed on the same day by the present applicant is used.
No .: Title of Invention: Robot Hand for Casting a Gold Ingot and a Mold Suitable for Holding by the Robot), a mold is placed on a base portion, soot is placed on the mold. The steps of attaching and removing the mold from the base can be automated.

The conditions for flowing the acetylene gas are as follows:
The mold may be determined by casting a molten metal, for example, gold, into the mold to which the soot is attached using the above-described mold release material attaching apparatus, and observing the state of the mold and the surface state of the obtained ingot after that. Preferred conditions obtained by the experiment are as follows. The distance between the mold and the tip of the acetylene gas burner is 10-16 cm, the crater of the acetylene gas burner is 1.5-3 mmφ, the amount of acetylene gas is 1-2 liter / min, and the acetylene gas outflow time is 1-2. Seconds.

[0014]

As described above, according to the mold release material attaching apparatus of the present invention, when a metal ingot is manufactured by a melting and casting method, an ingot having a small surface erosion and a good surface condition can be obtained. Further, according to the present invention, the step of attaching the release material to the mold can be automated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a release material attaching apparatus according to the present invention.
It is a front view which removes and shows a part.

FIG. 2 is a plan view of the mold release material attaching apparatus, also shown partially removed.

FIG. 3 is a side view of a release material applying apparatus suitable for applying a release material to a number of molds.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hood 2 Mold 3 Smoke exhaust pipe 4 Base part 5 Acetylene gas burner 6 Electric heater for ignition 7 Flame sensor 8 Photoelectric sensor

Claims (2)

(57) [Claims] 1. A base member on which a mold is placed, and a cross section having a shape substantially equal to the outer shape of a casting surface of the mold mounted on the base member, and which is disposed right above a mold to which a release material is to be attached. Hood, an acetylene gas burner arranged in the hood so that the tip is directed toward the mold, and an ignition electric heater arranged near the tip of the acetylene gas burner for igniting acetylene gas And a flame sensor for monitoring a flame of acetylene gas flowing out of the acetylene gas burner. 2. The apparatus for attaching a release material to a mold according to claim 1, wherein the base portion is configured to place a plurality of molds thereon, and the mold is sequentially placed on the base portion at a release material attachment position. An apparatus for attaching a mold release material to a mold, wherein a transfer means is provided.