JPH06346075A - Powdery releasing agent for molten metal forging - Google Patents

Abstract

PURPOSE:To obtain a powdary mold releasing agent to be used by spraying to the inner surface of a mold, composed exclusively of an inorganic compound as a powdery or granular lubricant and having excellent molten metal forging workability to prevent the seizure of the product and the generation of internal defects. CONSTITUTION:This releasing agent is composed exclusively of inorganic compounds to be used as a lubricant in solid state, exhibiting powdery or granular state and consisting of one or more compounds selected from talc, mica, boron compound, etc. Exclusively inorganic compounds or exclusively a mixture of organic and inorganic compounds may be used as the lubricant in solid state. Water is absent in each case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold release agent which is sprayed onto the inner surface of a mold in a molten metal forging operation.

[0002]

2. Description of the Related Art The molten metal forging method is widely used for manufacturing parts such as automobile wheels, pistons, rocker arms, etc., which require extremely high quality and reliability such as high strength and airtightness. In this molten metal forging method, a mold release agent is used in order to prevent direct contact between the mold and the molten metal, prevent seizure, and improve the mold release of the product.

As a mold release agent for molten metal forging, a water-soluble mold release agent is generally widely used. Water-soluble release agents are generally water,
A release agent base material such as graphite is added with a dispersant or an adhesion contributing agent.

[0004]

By the way, in recent years, particularly with the progress of weight reduction in the automobile industry, there has been an increasing demand for improving the quality, appearance, reliability, etc. of various parts. There has been an increasing demand for a release agent for good filling. And it has become impossible to satisfy such a demand with a water-soluble release agent. That is, in the case of a water-soluble mold release agent, internal porosity is generated in the product due to residual water, and thus reliability of pressure tightness is impaired, and since it is water-soluble, mold temperature control is possible. It is difficult, and therefore there is a problem that it is not possible to satisfy the demand for quality improvement in the casting surface and appearance of the product. Furthermore, in the case of a release agent mainly composed of graphite, various expenses are required to install equipment for preventing deterioration of working environment, waste water treatment equipment for preventing water pollution after use, etc. There was a problem. Therefore, a new type of release agent has been strongly desired.

The present invention has been made as a result of extensive studies and various systematic experiments in view of the above points.
In the molten metal forging method, a mold release agent for molten metal forging used for obtaining a product with higher reliability and quality with good workability and without deteriorating the environment, that is, specifically, product baking and internal porosity. Can be reliably prevented, and the product can be released from the mold better, and the working environment is not deteriorated during use.
Furthermore, it aims at providing the mold release agent for molten metal forging which does not pollute the water quality after use.

[0006]

The first powder mold release agent for molten metal forging according to the present invention is solid and is composed only of an inorganic compound used as a lubricant, and the inorganic compound has a powdery or granular form. As an inorganic compound, talc, mica,
One or more kinds of boron compounds, phosphorus compounds, graphite, metal oxides, sulfur compounds, nitrogen compounds, and fluorides are used.

The second molten metal forging powder release agent of the present invention is
It consists of only organic compounds that are solid and used as lubricants, and the organic compounds have a powdery or granular form. As an organic compound, one of a plurality of types of metal soaps and a plurality of types of polymer compounds is used. It is characterized by using the above.

A third mold release agent for molten metal forging according to the present invention is
A release agent comprising a mixture of a solid inorganic compound used as a lubricant and a solid organic compound used as a lubricant, both of which have a powdery or granular form,
Alternatively, the inorganic compound has a form coated with an organic compound, and as the inorganic compound, talc, mica, a boron compound,
Use one or more of phosphorus compounds, graphite, metal oxides, sulfur compounds, nitrogen compounds, and fluorides, and use one or more of multiple types of metal soaps and multiple types of polymer compounds as organic compounds. It is characterized by having been.

The greatest feature of the present invention is that the release agent has a powdery or granular form.

In the third powder mold release agent for molten metal forging, the content ratio of the organic compound to the inorganic compound is 0.
It is effective to select from the range of 1 to 90% by weight.

As the metallic soap, one obtained by adding sodium, calcium, barium, lithium, potassium, magnesium or zinc to the carboxylic acid skeleton,
As the polymer compound, polyethylene, polypropylene, epoxy resin, silicon resin, phenol resin, acrylic resin, alkyd resin, or polystyrene is particularly preferably used.

When these organic compounds are used as a mixture with an inorganic compound, they are mixed with the inorganic compound in the form of powder or granules, or are mixed with the inorganic compound in a state of being heated and melted. Therefore, in the above-mentioned third powder mold release agent for molten metal forging, both the inorganic compound and the organic compound have a powdery or granular form, or the powdery or granular inorganic compound is coated with the organic compound. Will have a morphology.
In addition, as for the organic compound, only one kind of the above-mentioned compound is
Alternatively, two or more kinds are used in combination. A metal soap and a polymer compound may be used in combination.

[0013]

Since the powder mold release agent for molten metal forging of the present invention has a powdery or granular form, the product and the mold inner surface are separated from each other in the mold inner surface portion to which the mold release agent is attached. It is ensured that the particles are separated by at least the particle size of the release agent powder or granules. Therefore, since the release agent is evenly attached to the inner surface of the mold, seizure due to direct contact between the product and the inner surface of the mold is reliably prevented, and the quality of the product is improved.

The release agent of the present invention is composed of only an inorganic compound, an organic compound, or a mixture of an organic compound and an inorganic compound, and does not contain water. The resulting defect does not occur. Therefore, the airtightness of the product is improved, and therefore the pressure resistance is also improved, and the reliability of the product is improved. Further, since the release agent of the present invention does not contain water, the mold temperature can be easily controlled, and the quality of the casting surface and appearance of the product is improved.

Further, since the release agent of the present invention has a powdery or granular form and does not contain water, the tension acting between the inner surface of the mold and the product is weak. Therefore, it is easy to remove the product from the mold. Moreover, it can be easily removed from the inner surface of the mold and the product surface. That is, workability is improved.

Further, since the release agent of the present invention has a powdery or granular form, it hardly reacts even if heat is applied during the forging of the molten metal, and almost no gas is generated. Further, unlike the water-soluble release agent, it does not pollute the water quality after use. Therefore, the working environment is not deteriorated and the water quality is not contaminated, and the cost for wastewater treatment equipment and the like is unnecessary and the cost can be reduced.

[0017]

EFFECTS OF THE INVENTION The powder mold release agent for molten metal forging of the present invention has a powdery or granular form, so that it is possible to reliably prevent the seizure of the product and the occurrence of internal defects, and to improve its quality and quality. The reliability with respect to pressure tightness can be improved, and further, the molten metal forging work can be performed with better workability, and further, the deterioration of the environment during use and after use can be sufficiently prevented.

In particular, when the organic compound and the inorganic compound are mixed and used, the quality of the obtained product is further improved by setting the content ratio of the organic compound to the inorganic compound in the range of 0.1 to 90% by weight. It can be good.

Further, as an organic compound, metal soap obtained by adding sodium, calcium, barium, lithium, potassium, magnesium or zinc to a carboxylic acid skeleton, polyethylene, polypropylene, epoxy resin,
By using a polymer compound of silicon resin, phenol resin, acrylic resin, alkyd resin, or polystyrene, the above effect can be exhibited more effectively.

[0020]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto. The following (A)
The release agents of (E) were obtained, a forging test by a molten metal forging method was performed using these release agents, and the respective items shown in Table 1 were compared and examined. (A) to (D) are examples of the present invention,
(A) is composed only of an inorganic compound, (B) is composed only of an organic compound and uses both a metal soap and a polymer compound as an organic compound, and (C) is composed only of an organic compound. In this case, only a polymer compound is used as an organic compound, and (D) is a mixture of an organic compound and an inorganic compound. (E) is a comparative example. Each compound used in the release agents (A) to (E) is commercially available.

(A) Silicon nitride (average particle size: 10 μ) 30
Part, mica 60 parts, and graphite 10 parts, the first example of the present invention, (B) polypropylene 40 parts, calcium stearate 60 parts, the second example of the present invention, C) Polyethylene (average particle size 5μ) 100
Example 3 of the invention consisting of 10 parts, (D) 25 parts of talc (average particle size 6 μ), 10 parts of boron nitride (average particle size 10 μ), and 4 parts of the invention consisting of 65 parts of polyethylene. A comparative example which is a water-soluble graphite-based mold release agent comprising (E) graphite and an adhesion contributing agent as main components in a ratio of 30: 2,

[0022]

[Table 1]

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[Procedure amendment]

[Submission date] July 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

The first powder mold release agent for molten metal forging according to the present invention is solid and is composed only of an inorganic compound used as a lubricant, and the inorganic compound has a powdery or granular form. As an inorganic compound, talc, mica,
One or more kinds of boron compounds, phosphorus compounds, graphite, metal oxides, sulfur compounds, nitrogen compounds, and fluorides are used. A silicic acid compound may be used as the inorganic compound.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

A third mold release agent for molten metal forging according to the present invention is
A release agent comprising a mixture of a solid inorganic compound used as a lubricant and a solid organic compound used as a lubricant, both of which have a powdery or granular form,
Alternatively, the inorganic compound has a form coated with an organic compound, and as the inorganic compound, talc, mica, a boron compound,
Use one or more of phosphorus compounds, graphite, metal oxides, sulfur compounds, nitrogen compounds, and fluorides, and use one or more of multiple types of metal soaps and multiple types of polymer compounds as organic compounds. It is characterized by having been.
A silicic acid compound may be used as the inorganic compound.

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Claims (6)

[Claims] 1. A solid, only inorganic compound used as a lubricant, wherein the inorganic compound has a powdery or granular form, and as the inorganic compound, talc, mica, a boron compound, a phosphorus compound, graphite, A powder mold release agent for molten metal forging, comprising at least one selected from metal oxides, sulfur compounds, nitrogen compounds and fluorides. 2. A solid solid organic compound used only as a lubricant, wherein the organic compound has a powdery or granular form. As the organic compound, a plurality of kinds of metal soaps and a plurality of kinds of polymer compounds are used. Among them, one or more kinds of powder release agents for forging molten metal are used. 3. A release agent comprising a mixture of a solid inorganic compound used as a lubricant and a solid organic compound used as a lubricant, both of which have a powdery or granular form. , Or an inorganic compound has a form covered with an organic compound, as the inorganic compound, talc, mica,
Use one or more of a boron compound, a phosphorus compound, graphite, a metal oxide, a sulfur compound, a nitrogen compound, and a fluoride,
A powder mold release agent for molten metal forging, comprising one or more of a plurality of types of metal soaps and a plurality of types of polymer compounds as organic compounds. 4. The organic compound is 0.1 to the inorganic compound.
The powder mold release agent for molten metal forging according to claim 3, wherein the powder mold release agent is contained in a proportion of about 90% by weight. 5. The powdery mold release agent for molten metal forging according to claim 2 or 3, wherein the metal soap has carboxylic acid skeleton to which sodium, calcium, barium, lithium, potassium, magnesium or zinc is added. 6. The powder mold release agent for molten metal forging according to claim 2 or 3, wherein the polymer compound is polyethylene, polypropylene, epoxy resin, silicon resin, phenol resin, acrylic resin, alkyd resin, or polystyrene.