JPH0780592A - Method and device attaching release agent to die - Google Patents

Abstract

PURPOSE:To simply automate the process where the degree of the erosion of a die is extremely small, the surface condition of the metal ingot is excellent, and the release agent is stuck to die in manufacturing the metal ingot such as gold. CONSTITUTION:The soot generated by burning the acetylene gas at the upper part of a die 2 is adhered to the inner wall surface. A release agent sticking device to the die consists of a base part 4 where the die is loaded, a hood 1 which has the section of the shape approximately equal to the outer shape of the casting surface of the die loaded on the base part, and arranged immediately above the die where the release agent is adhered, an acetylene gas burner 5 which is guided into the hood and arranged so that the forward end part may be directed to the die, and an electric heater 6 for ignition which is arranged in the vicinity of the tip part of the acetylene burner and used to ignite the acetylene gas.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, when a metal ingot such as gold is manufactured by a melting casting method, 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 with which the molten metal contacts.

[0003]

When a mold release material is applied to the inner wall surface of the mold, generally, a method is used in which soot generated by incomplete combustion of kerosene is attached to the mold surface. However, since kerosene is a liquid, it is necessary to prepare a core material when burning it and to soak the core material and burn it. There is also a method of spraying a release material as described in JP-A-1-239384. However, this method is not suitable for automating this step because a burner is required to dry the sprayed release material.
In addition, there is also 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 becomes nonuniform and has many irregularities,
The obtained ingot also had a defect that the surface in contact with the mold had poor gloss.

Therefore, the object of the present invention is to produce a metal ingot such as gold, in which the degree of erosion of the mold is extremely small, the surface condition of the obtained ingot is good, and the mold release material is attached to the mold. It is an object of the present invention to provide a method and an apparatus for attaching a release material to a mold, which can be simply and automatically automated.

[0005]

In order to achieve the above-mentioned object, the present invention provides a mold characterized in that the soot generated by burning acetylene gas above the mold is attached to the inner wall surface of the mold. The method of attaching the release material is adopted.

According to the present invention, the base part on which the mold is placed, and the true part of the mold having a cross section of a shape almost equal to the outer shape of the casting surface of the mold placed on the base part and to which the release material is to be attached A hood arranged above, an acetylene gas burner arranged so as to be guided into the hood so that its tip is directed to the mold, and arranged near the tip of the acetylene gas burner to ignite acetylene gas. An apparatus for adhering a release material to a mold, which has an electric heater for ignition is adopted.

[0007]

[Embodiment] Considering the method and apparatus for depositing the mold release material, it is more likely that the gaseous mold release material raw material can be more simply automated in terms of transfer and control than the liquid mold release material raw material. Based on this idea, various hydrocarbon gases were used to test whether or not it was effective as a mold release material. For example, when propane gas was used, there was unevenness in the adhesion of the mold release material, but when acetylene gas was used, fine soot was generated and adhered evenly to the mold surface, and the metal ingot obtained by casting was used. The surface of is also glossy and in a good state, and the inventors have found that acetylene gas is the best raw material for a gaseous release material as far as the present inventors know. Therefore, the present invention uses acetylene gas as a raw material for the generation of 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 a release material applying device of the present invention with a part of the device removed, and FIG. 2 is a plan view of a release material applying device also shown with a part of the device removed. FIG. 3 is a side view of a release material attaching apparatus suitable for attaching the release material to a large number of molds.

1 to 3, the hood 1 has a horizontal cross section that is substantially the same as the outer dimensions of the mold 2 placed on the base portion 4, and the bottom end of the hood 1 is located immediately above the mold 2. Also, the upper end portion thereof 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 its crater faces the casting surface of the mold 2. Further, an ignition heat transfer heater 6 having a coil portion which is heated red is similarly introduced into the hood 1 near the crater of the acetylene gas burner 5. A slightly larger 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 is inserted under the hood 1 is installed near the lowermost end of the hood 1.

Next, the operation of the release material attaching device of the present invention will be described. When the mold 2 is inserted between the lowermost end portion of the hood 1 and the base portion 4, a solenoid valve (not shown) arranged in the acetylene gas pipe operates, and acetylene gas is ejected from the acetylene gas burner. At this time, the tip portion of the ignition electric heater 6 is ignited by coming into contact with the coil portion which is always red-hot, 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 through an exhaust pipe 3 by an exhaust gas fan (not shown). The supply of acetylene gas is stopped after a lapse of a predetermined time by setting a timer of an electromagnetic valve by a controller (not shown).

In the embodiment of FIG. 3, a rodless cylinder 9 is provided below the base portion 4, and when the rodless cylinder 9 is operated, it is connected to the rodless cylinder 9 and formed on the base portion 4. The push pin protruding upward through the longitudinal opening (not shown)
Move in the longitudinal direction. Therefore, the molds placed side by side on the base portion 4 are sequentially pushed and brought to the release material adhering position, inserted between the hood 1 and the base portion 4, and the soot is attached in the same manner as described above.

At this time, the photoelectric sensor 8 is used to determine whether or not the mold is at the release material adhering position, and a patent application filed by the applicant on the same day (reference number: 05-0031).
P, the title of the invention: robot hand for casting gold ingot and mold suitable for gripping by the robot), the use of the robot hand and the mold enables the placement of the mold on the base portion and the soot on the mold. It is possible to automate the processes such as the attaching process and the removal of the mold from the base.

The conditions for the flow of acetylene gas are as follows:
It may be determined by pouring molten metal such as gold into the mold to which the soot is adhered, using the above-mentioned mold release material adhering device, and observing the condition of the mold thereafter and the surface condition of the obtained ingot. The preferable conditions obtained by the experiment are as follows. The distance between the mold and the tip of the acetylene gas burner is 10 to 16 cm, the crater of the acetylene gas burner is 1.5 to 3 mmφ, the acetylene gas amount is 1 to 2 liter / min, and the acetylene gas outflow time is 1 to 2 Seconds.

[0015]

As described above, according to the method and apparatus for depositing a release material of the present invention, a metal ingot is melted and
An ingot with less surface erosion and a good surface condition can be obtained when manufactured by the casting method. Further, according to the present invention, the step of attaching the release material to the mold can be automated.

[Brief description of drawings]

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

FIG. 2 is a plan view of the release material applying device, which is also shown with a part thereof removed.

FIG. 3 is a side view of a mold release material deposition device suitable for depositing mold release material on multiple molds.

[Explanation of symbols]

 1 Hood 2 Mold 3 Smoke Exhaust Tube 4 Base 5 Acetylene Gas Burner 6 Electric Heater for Ignition 7 Flame Sensor 8 Photoelectric Sensor

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[Procedure amendment]

[Submission date] August 9, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (4)

[Claims] 1. A method of attaching a release material to a mold, characterized in that the soot generated by burning acetylene gas above the mold is attached to the inner wall surface of the mold. 2. A base part on which a mold is placed, and a mold which has a cross section of a shape almost equal to the outer shape of the casting surface of the mold placed on the base part and which is arranged directly above the mold to which the release material is to be attached. Hood, an acetylene gas burner arranged so that its tip end is directed toward the mold by being guided into the hood, and an electric heater for ignition for igniting acetylene gas arranged near the tip end of the acetylene gas burner. An apparatus for attaching a release material to a mold, comprising: 3. The mold release material adhering device according to claim 2, wherein the base part is configured to mount a plurality of molds, and the mold parts are sequentially placed on the base part at the release material adhering position. An apparatus for attaching a release material to a mold, characterized in that it is provided with a transfer means. 4. The mold release material adhering device for a mold according to claim 2, further comprising a flame sensor for monitoring a flame of the acetylene gas flowing out from the acetylene gas burner. apparatus.