JP2000051995A - Coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and visually discriminate to what extent a coating film thickness is decreased during casting by making difference of the color of coating layers to be superposed in laminating plural coatings on the surface of a die. SOLUTION: A white color coating agent is coated on a die 1 in about 150 μm to form a white color coating 2. A red color coating agent, in which a red oxide Fe2O3 of 0.1-0.5 part is added based on a white color coating 100 part, is coated on the white coating 2 in 50 μm to form a red coating 3. When conducting castings in many times, part of a top coating of the red coating 3 is worn to bring out a base coating of the white coating. The place only at which a top coating of the white coating is brought out, is again formed with an top coating of the red coating 3 to resume casting. An inorganic face paint having heat resistance in place of a red oxide Fe2O3 may be used. For example, they are cinnabar HgS, red lead Pb3O4 cadmium red Cd. The coating having three or more layers may be formed depending on a color of a bottom coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mold formed on a mold surface.

[0002]

2. Description of the Related Art Hitherto, as disclosed in Japanese Patent Application Laid-Open No. 57-134237, the structure of a multilayer coating mold has been known. Because it is required to have heat insulating properties, a multi-layer coating structure in which a fire-resistant and heat-insulating coating such as alumina is applied as a base coating, and a fire-resistant coating such as zircon flower is applied as an upper coating. Met.

[0003] However, the structure of the above-mentioned multi-layer coating mold certainly has fire resistance to the molten metal and heat insulation to the mold, but the structure of the multi-layer coating mold wears the casting mold during casting. In the process of decreasing the thickness of the coating mold, there is a problem that it is not possible to visually determine how much the thickness has decreased. For this reason, when the fire-resistant and heat-insulating coating of the base material appears, it is only possible to determine whether the thickness of the coating has been reduced. There was a problem that it was not possible.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the thickness of a mold during the casting process, which is a problem of the prior art described above, in which the mold is worn away and the thickness of the mold decreases. The purpose of this is to make it easy to visually judge.

[0005]

The coating mold according to the present invention comprises:
In order to achieve the above object, in a mold in which a plurality of mold layers having substantially the same performance are laminated on the surface of a mold, the colors of the mold layers overlapping each other are different. It is a mold.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a mold according to one embodiment is applied to a mold. Here, FIG.
Is a process in which the following steps (a) to (d) are performed.

(A) Application step of base coat agent A white coat agent made by Company A is applied to the mold 1 as a base coat agent by about 150 μm, so that the white coat mold 2 is applied to the mold 1. It is formed.

(B) Coating process of upper mold wash As an upper mold wash, 0.1 to 0.5 parts of iron oxide, Bengala Fe ₂ O ₃ is added to 100 parts of white mold. By applying about 50 μm of the red coating agent prepared by addition to the white coating die 2, the upper red coating die 3 is formed on the white coating die 2.

[0009] Here, the red iron oxide is used as a white coating agent 100.
The reason for adding 0.1 to 0.5 part to the part is
It is as follows.

When the amount of the red paint is less than 0.1 part, the red coating mold 3 cannot be colored sufficiently red, and the distinction between the red coating mold 3 and the white coating mold 2 on the base becomes unclear. On the other hand, when the amount of bengara exceeds 0.5 parts, the functions of the red coating mold 3 in terms of fire resistance and heat insulating properties are significantly reduced.

(C) Casting Step and Coating Mold Wear Step Casting is started in a mold 1 having a base white coat 2 and an upper red coat 3.

After 100 castings, a part of the upper red mold 3 was worn due to the impact of the molten metal on the red mold 3 and the like, and the base white coat 2 appeared. The wear of the upper red mold 3 does not cover the entire surface of the white mold 2 on which the red mold 3 exists, and both a portion where the mold is significantly worn and a portion where the wear does not progress much coexist. It is in a state where it has been done.

(D) Coating mold repairing step By applying the upper base red coating agent only to the portion where the base white coating mold 2 appears, the upper base red coating mold 3 is converted to the base white coating mold 2. Form again on top and then resume casting.

Here, in order to obtain a red coating agent, the inorganic pigment Bengala Fe ₂ O ₃ was added to the white coating agent. However, a red coating agent can be used instead of Bengala Fe ₂ O _3. Of course. Also, other red inorganic pigments such as HgS vermilion, leadtan Pb ₃ O ₄ , cadmium red are added to the coating agent.
Of course, Cd can be used if it has heat resistance higher than the mold temperature of the mold 1. Furthermore, hydrated iron oxide Fe ₂ O ₃
When nH ₂ O is also added to the white coating agent and applied as a red coating agent on the white coating substrate 2 as a base, a powder of iron oxide, Bengala Fe ₂ O ₃ is obtained by the following chemical reaction formula. Can be used. Fe ₂ O ₃・ nH ₂ O → Fe ₂ O ₃ + nH ₂ O

The combination of the white coating mold 2 and the red coating mold 3 is a combination using the same coating agent, and the fire resistance to the molten metal as the coating mold and the heat insulating property to the mold in the white coating mold 2 of the base. The casting is carried out while ensuring a minimum thickness of the coating film necessary for the above. The thickness of the coating film of the upper red mold 3 is set within an appropriate thickness range. That is, if the film thickness is too thin, the white coating mold 2 as the base appears immediately after casting, and the number of repairs of the coating mold increases, so that a film thickness of a predetermined value or more is required. Conversely, if the film thickness is too large, the cast product will be smaller than the required dimensions, so that the thickness of the coating film of the red mold 3 is set within an appropriate film thickness range.

The difference between the white mold 2 and the red mold 3 is as follows.
Since there is only a difference in the presence or absence of bengara, properties such as adhesion between the white coating mold 2 and the red coating mold 3 are very good.

Colored materials such as coating agents, organic pigments and dyes can be used as long as they have heat resistance higher than the mold temperature of the mold 1. The combination of colors is not limited to the combination of white and red.For example, a combination of blue and white such as cobalt blue CoO.nAl ₂ O ₃ and titanium white TiO ₂ or zinc chromate
A combination of K ₂ O, 4ZnO, 4CrO ₃ , 3H ₂ O, and a combination of yellow and purple such as cobalt purple Co ₃ (PO ₄ ) ₂ is optional.

The embodiment of the present invention is an example of two layers of a white mold and a red mold. For example, as a base coat, purple of zinc chromate K ₂ O.4ZnO.4CrO ₃ .3H ₂ O Titanium white TiO ₂ white as intermediate coating type, cadmium red as top coating type
Combinations of three or more coatings such as Cd are also optional.

Here, the reason for performing coating with three or more layers is to apply a fire-resistant and heat-insulating coating such as alumina as a base coating as disclosed in Japanese Patent Application Laid-Open No. 57-134237. When a fire resistant coating such as zircon flower is applied as an intermediate coating, by adding bengara etc. to the fire resistant coating such as zircon flower of the intermediate coating as an upper coating, the intermediate coating is applied. This is because there is a case where a mold of a different color is performed and it is desired to determine the wear of the upper mold.

Further, a white coat having heat insulating properties is used as a base coat, a fire-resistant red coat is used as an intermediate coat, and a white pigment is added to a red intermediate coat as an upper coat. The combination of the white mold again is optional.

[0021]

According to the present invention, in a mold in which a plurality of mold layers having substantially the same performance are laminated on the surface of the mold, the colors of the mutually overlapping mold layers are made different, so that the wear of the mold is visually observed. Can be determined by

[Brief description of the drawings]

FIG. 1 shows a state in which a coating mold according to an embodiment of the present invention has been applied to a mold.

[Explanation of symbols]

 1 Mold 2 White coating 3 Red coating

Claims (1)

[Claims] 1. A mold comprising a plurality of mold layers having substantially the same performance laminated on the surface of a mold, wherein the colors of the mutually overlapping mold layers are different from each other.