JPH0637642B2 - Metal materials for arts and crafts that can be easily engraved or cut, and a method for manufacturing a sintered product using the metal material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention is a metal processed product such as engraving, relief, prints, ornaments, ornaments, etc. using a metal material, which has hitherto been difficult for an amateur. The present invention also relates to a technology for making it possible for ordinary people to easily work on it, and by heat-treating it to easily produce a sintered product having the strength, luster or texture unique to metal.

“Prior Art” Conventionally, relief is made using a copper plate that is relatively soft and easy to handle as a metal. Even in such a case, a special tool for metal working is used. It required skill and was not something that ordinary people could do easily. Moreover, it is more difficult to make arts and crafts by carving, cutting and processing them using various harder metal materials, and only a few experts can do the work. This is the current situation.

The present inventor has improved the present situation as described above, and
We develop and provide metal materials that can be easily carved and machined in the same way as when using wax, stones, etc., and this makes it possible for a wide range of people to make art works, crafts, and decorations made of metal. The purpose is to make it possible to enjoy the creative activities of products, etc., and to finish the creatively processed products as a sintered product by the heat treatment technology according to the present invention, and to enjoy the unique luster, color, texture, etc. of metals. It is what

"Problems to be solved by the invention" The inventor, as a technique having a different field of use, is a technique for producing a precision machine part by molding a kneaded product of iron-based fine metal powder or ceramic powder and an organic binder and then performing a heat treatment. , While focusing on the good moldability and machinability of the kneaded product that can be formed in the intermediate process stage, to make a new metal material with good engraving and cutting workability and suitable for the above purpose, In addition, the product after heat treatment has been improved so that it retains the image of the creator and is beautiful in appearance. That is, since the technology for producing the precision machine parts uses fine metal powder having an average particle size of 5 μm or less, the linear shrinkage due to the heat treatment is as large as 15% to 20%, which greatly increases the image of the creator as an art work. However, it is not suitable for producing a sintered product by directly applying the technique to the present invention because it has a difficulty of changing. This is because the kneaded product for producing precision machine parts mainly has moldability and does not take into consideration engraving and cutting workability. Generally, the goon body (molded body) has poor shape retention and adhesiveness, and the raw material also has an external appearance. There are drawbacks such as not being limited to materials that emphasize beauty. Therefore, it has been improved to eliminate these drawbacks, good engraving and cutting workability can be easily processed even by an amateur, and heat treatment makes it possible to obtain a sintered product with a unique luster, color, texture, etc. of a beautiful metal. It is intended to provide a manufacturing method.

"Means for Solving Problems" First, the first invention relates to a metal material for arts and crafts, which enables easy work such as engraving and cutting.

It is made of copper, silver, nickel, aluminum, zinc, tin,
92% to a metal powder composed of a simple substance such as iron, a mixture of two or more kinds thereof, or an alloy thereof and having an average particle size of 5 μm to 40 μm
96% (weight ratio) is used as a main material, at least high-density polyethylene and ethylene vinyl acetate copolymer are kneaded as an adhesive, and microcrystalline wax and paraffin wax are kneaded as a plasticizer.
If necessary, polypropylene, carnauba wax,
8% of several kinds of organic binders which kneaded stearic acid etc.
It is a metal material for arts and crafts that can be easily worked such as engraving and cutting, by kneading up to 4% (weight ratio) and shaping it into an appropriate shape to obtain a kneading shaped body.

That is, the raw material may be a simple substance of copper, silver, nickel, aluminum, zinc, tin, iron or the like, a mixture of two or more kinds of these metals, or an alloy thereof, and they have an average particle size of 5 μm to It is necessary that 40 μm metal powder be the main material. If the average particle size of the main metal powder is less than 5 μm, the formability is good, but the engraving and cutting processability are poor, and the linear shrinkage rate is large, so the shape distortion at the time of heat treatment finish becomes large and the image Will be lost. Further, when the average particle diameter of the metal powder as the main material is 40 μm or more, not only the moldability is deteriorated but also the engraving and cutting workability becomes rough and the cut surface becomes rough, resulting in a defect that the appearance is poor. In addition,
In the present invention, it goes without saying that a small amount of metal powder having an average particle size of 5 μm or less may be kneaded intentionally or unconsciously.

The binder is made by kneading at least high-density polyethylene and ethylene-vinyl acetate copolymer, which have a high adhesive effect, and kneading microcrystalline wax and paraffin wax as a plasticizer. These are binders with relatively strong adhesiveness, and as a metal material for kneaded molded bodies, in order to ensure an appropriate shape retention force that does not accidentally crack or chip when carving or cutting. is necessary. Further, polypropylene, carnauba wax and stearic acid as a lubricant may be kneaded so as to give a proper fluidity to the kneaded product.

Next, regarding the mixing ratio of the metal powder and the organic binder,
92% of metal powder having an average particle size of 5 μm to 40 μm as the main material
~ 96% (weight ratio), 8% to 4% (weight ratio) of several kinds of organic binders are kneaded, and the kneaded and molded body has a hardness that is suitable for engraving and cutting by human power. It becomes a metal material for crafts.

The second invention is a method for producing a processed product using a metal material for arts and crafts as a sintered product.

First of all, copper, silver, nickel, aluminum, zinc,
Metal powder 92 having an average particle size of 5 μm to 40 μm, which is made of a simple substance such as tin or iron, or a mixture of two or more thereof, or an alloy thereof.
% To 96% (weight ratio) as a main material, and at least high density polyethylene and ethylene vinyl acetate copolymer as an adhesive are kneaded with this, and microcrystalline wax and paraffin wax as a plasticizer are kneaded, Further, if necessary, several kinds of organic binders 8% to 4% (weight ratio) obtained by kneading polypropylene, carnauba wax, stearic acid, etc. are kneaded and then formed into an appropriate shape to form a kneaded molded product. Prepare metal materials for arts and crafts that can be engraved and cut.

This is a method for producing a sintered product in which, after being subjected to arbitrary work such as engraving and cutting, a heat treatment for degreasing and sintering is performed under the condition that the linear shrinkage is 10%.

Regarding the heat treatment for degreasing and sintering, the degreasing treatment is generally performed by performing heat treatment in the atmosphere at 230 ° C. to 300 ° C. for 4 to 6 hours, although it depends on the specific raw material and the type of organic binder. The sintering process is 700
The heat treatment is performed at a high temperature of ℃ to 1000 ℃ for 2 to 3 hours.

[Example] <Example 1> A spherical copper powder having an average particle diameter of 37 μm or less and an organic binder made of high-density polyethylene, ethylene vinyl acetate copolymer, microcrystalline wax, paraffin wax, or the like in a weight ratio of 95. : The mixture was mixed at a ratio of 5 and kneaded at about 140 ° C. for 2 hours to give a product having a diameter of 40 m.
m and a thickness of 5 mm to form a kneaded molded body.

This kneaded and molded product is very easy to cut and can be easily engraved with an ordinary carving knife or knife. The cutting surface is also very beautiful and fine workmanship is possible.

Further, the kneaded and molded product can be easily punched by a drilling machine, and no inconvenience such as breakage occurs at that time. Next, after degreasing the relief-added medal that has undergone work such as engraving and cutting in the atmosphere at about 250 ° C. for 5 hours,
Sintering was performed at 1000 ° C. for 2 hours in a hydrogen stream. The linear shrinkage at that time was about 4%. After being sintered, the medal had a sufficient strength close to that of ordinary metal, and by simple polishing with abrasive paper, a medal with a relief having a metallic luster of copper could be produced.

Example 2 Spherical copper powder having an average particle size of 37 μm or less, and an average particle size of 5 μm
The following nickel powder was mixed at a weight ratio of 9: 1 as metal powder, and an organic binder having the same composition as the above at a weight ratio of 95: 5 was mixed to about 14
Kneading at 0 ° C for 2 hours, the product has a diameter of 40 mm and a thickness of 5 m.
It is formed into a medal shape of m and kneaded and formed. This kneaded and molded product was also very easy to cut as in the first embodiment, and could be easily engraved manually by using an ordinary engraving knife or knife. The cutting surface at that time is very beautiful, and even an amateur can easily perform fine work.

The relief medal that has been subjected to such work as engraving and cutting is degreased in the air at about 250 ° C for 5 hours, and then,
Sintering was performed in a hydrogen stream at 1000 ° C. for 2 hours, and then simple polishing with polishing paper or the like gave a medal with a relief having a beautiful golden metallic luster with a linear shrinkage of about 4%.

<Example 3> A spherical copper powder having a particle diameter of 37 µm or less and a nickel powder having an average particle diameter of 5 µm were mixed at a weight ratio of 8: 2 as metal powder.
The machinability of the kneaded molded product produced by varying the amount of the organic binder composed of high-density polyethylene, ethylene vinyl acetate copolymer, microcrystalline wax, paraffin wax, etc. to be kneaded in the range of 3 to 10% by weight. Table 1 shows the results of an examination of degreasing properties, sintering properties, and the like when heat-treated under the same conditions.

As a result of examining this example, the following was found. The appropriate amount of the organic binder to be kneaded is desirably determined to be 5% to 7%, but if the mixing ratio of the finer nickel powder is increased, the amount of the organic binder exhibiting an appropriate amount increases accordingly, and conversely, the fine powder. Decreasing the mixing ratio of 1 tends to reduce the amount of organic binder required. Therefore, the amount of the organic binder to be kneaded, which is suitable for producing the metal material according to the present invention that can be easily worked such as engraving and cutting, is in the allowable range of 4% to 8% (weight ratio).

"Effects" The present invention has an average particle size of 5 μm as a metal material for arts and crafts.
A metal powder of ~ 40 μm is used as a main material, and several kinds of organic binders are kneaded with this powder, which is then molded into an appropriate shape to form a kneaded molded body. It provides a metal material for.

In this novel metallic material, the metallic powder has an appropriate hardness and shape-retaining power through the organic binder. Therefore, the metal material has a characteristic that it is easy to perform work such as engraving and cutting while maintaining the molded shape. As a result, it has become possible to perform the engraving and cutting work of metal materials, which has been conventionally difficult for amateurs, just as easily as when using wood, clay, wax, stone, etc., by human power.

Moreover, if this is later degreased and sintered, it can easily be a sintered product, and you can enjoy handmade sculptures, designs and works of art with the luster, texture, and light peculiar to metal.

As described above, the metal material for arts and crafts according to the present invention is excellent in moldability and machinability, so that it is possible to easily perform work such as engraving and cutting, and anyone can easily create a creative work. Since the work can be easily finished into a sintered product by heat treatment, metal reliefs, sculptures, which were traditionally said to be made only by experts with specialized tools and equipment, It is now possible for amateurs to easily enjoy crafts, ornaments, and accessories.

Claims (2)

[Claims] 1. Copper, silver, nickel, aluminum, zinc,
Metal powder 92 having an average particle size of 5 μm to 40 μm, which is made of a simple substance such as tin or iron, or a mixture of two or more thereof, or an alloy thereof.
% -96% (weight ratio) as the main material, and at least high-density polyethylene and ethylene vinyl acetate copolymer as an adhesive are kneaded therein, and microcrystalline wax and paraffin wax are kneaded as a plasticizer. Further, if necessary, several kinds of organic binders 8% to 4% (weight ratio) in which polypropylene, carnauba wax, stearic acid and the like are kneaded are mixed, and then molded into an appropriate shape to obtain a kneaded molded body. A characteristic metal material for arts and crafts that can be easily sculpted and cut. 2. Copper, silver, nickel, aluminum, zinc,
Metal powder 92 having an average particle size of 5 μm to 40 μm, which is made of a simple substance such as tin or iron, or a mixture of two or more thereof, or an alloy thereof.
% -96% (weight ratio) as the main material, and at least high-density polyethylene and ethylene vinyl acetate copolymer as an adhesive are kneaded therein, and microcrystalline wax and paraffin wax are kneaded as a plasticizer. Further, if necessary, several kinds of organic binders 8% to 4% (weight ratio) obtained by kneading polypropylene, carnauba wax, stearic acid, etc. are kneaded and then formed into an appropriate shape to form a kneaded molded product. Prepare a metal material for arts and crafts that can be engraved or cut, and after this is subjected to any engraving or cutting, heat treatment to degrease and sinter under the condition of 10% linear shrinkage. A method for producing a sintered product using the above-mentioned metal material, characterized in that it is finished by rolling.