JPH0448040A - High strength die alloy - Google Patents

Abstract

PURPOSE:To secure mechanical strength and to make better castability and workability in a die alloy by using an alloy obtd. by incorporating specified amounts of Al, Fe, Ni as well as Co, Mn and Zn into Cu. CONSTITUTION:The compsn. of a high strength die alloy is formed of, by weight, 5 to 15% Al, 0.5% Fe, 0.1 to 3% Ni and Co, 0.5 to 2% Mn, 0.5 to 2% Zn and the balance Cu with inevitable impurities. If required, 0.01 to 1% Ag and 0.1 to 5% of one or more kinds among rare earth elements are furthermore incorporated therein. The added Al and Cu are alloyed to improve the mechanical strength. Fe, Mn and Zn improve the mechanical strength, and Ni and Co improve the hardness and corrosion resistance. In this die alloy, mechanical strength and surface hardness are improved by the incorporation of Mn, Fe, Zn or the like, and oxidation resistance and toughness are improved by the incorporation of Ni.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a high-strength mold alloy used for plastic molding that has excellent mechanical strength, is easy to cast and process, and has good weldability.

(Conventional technology) In recent years, housings and components of various devices such as office automation equipment, automobile components, etc. have been made of plastic, and frequent model changes have been made to improve their performance and change their designs. . Along with this, the life cycle of molded products has become shorter, and high-mix, low-volume production is being implemented. For this reason, materials that are easy to cast and process are required as constituent members of plastic molds.

355C series carbon steel for mechanical structures is commonly used as a component of conventional injection molds, particularly injection molds. In other words, S55 series carbon steel not only has good strength, weldability, graining workability, polishing workability, etc. required as an injection molding material, but also has excellent machinability, and is also suitable as a material for molds. This is because it has the characteristic of being relatively inexpensive.

However, in line with the trend of high-mix, low-volume production as mentioned above, there is an increasing demand for lower mold costs and shorter delivery times, and in order to meet these demands, S55 The problem with carbon steels is that it is not possible to sufficiently reduce machining costs, which account for the majority of mold manufacturing costs.

Therefore, in recent years, zinc-based alloys and copper alloys have been used as constituent materials for plastic molds, which have low casting temperatures and are easy to cast and process.

Zinc-based alloys include ZAMAX, ZAS, and Klarksj.
It is based on a low melting point alloy such as te.

Further, the steel alloy contains aluminum, iron, manganese, etc. in addition to copper, as described in, for example, Japanese Patent Publication No. 5B-11380.

(Problems to be Solved by the Invention) However, the above-mentioned conventional zinc-based alloys have poor mechanical properties such as strength and hardness, so they must be designed with a considerable amount of margin, and they do not have a mirror surface. The parts and products that can be used are limited, and it is difficult to prevent casting defects such as pinholes and cavities, and repairs such as welding are essential. There is a problem in that unevenness occurs and is transferred to the molded product. On the other hand, even copper alloys have the problem of low hardness and lack of specularity.

(Means for Solving the Problems) The present invention was made for the purpose of solving the conventional problems as described above. 5%, nickel and/or cobalt 0.1 to 2%, manganese 0.5 to 2%, zinc 0.5 to 2%, and the balance copper and inevitable impurities, a high strength mold alloy, 2 ．． Aluminum 5 to 15%, iron 0.5 to 5%, nickel and/or cobalt O 1 to 2%, manganese 0.
5-2%, zinc 0.5-2%, silver 0.01-1%
, and the balance being unavoidable impurities such as copper, and 30% by weight aluminum 5 to 1
5%, iron 0.5-5%, nickel and/or cobalt 0.1-2%, manganese 0.5-2%, zinc 0
．． 5 to 2%, one or more rare earth elements 0.01 to 1%, and the balance is copper and unavoidable impurities. The purpose is achieved.

In the present invention, the reason why the content of the alloy is limited as described above will be explained.

■Aluminum content In the alloy of the present invention, the inclusion of aluminum has the effect of improving mechanical strength by alloying the aluminum with copper. If the weight percentage is less than 5%, no great effect can be expected, and if it exceeds 15%, brittleness increases and impact strength decreases significantly, so the range is 5 to 15% by weight. %
It was determined that

■Iron content In the alloy of the present invention, the inclusion of iron is effective in improving mechanical strength, but the content is 0.00% by weight.
If it is less than 5%, there is no effect, and if it exceeds 5%, deoxidation is significant, so the range was set as 0.5 to 5% by weight. ■Content of nickel and/or cobalt In the alloy of the present invention, the inclusion of nickel and/or cobalt has the effect of improving hardness and corrosion resistance, but the content is less than 0.1% by weight. If the content exceeds 3%, brittleness increases, so the range was set as 0.1 to 3% by weight.

■Manganese content In the alloy of the present invention, the inclusion of manganese has the effect of improving mechanical strength, but if the content is less than 0.5% by weight, no effect can be obtained. 2
Since brittleness increases when the content exceeds 0.5% by weight, the content is set at 0.5 to 2% by weight.

■Zinc content In the alloy of the present invention, the inclusion of zinc has the effect of improving machinability, but if the weight percentage is less than 0.5%, the desired effect cannot be expected; If the content exceeds this amount, the strength will be significantly reduced, so the content was set at 0.5 to 2% by weight.

■Silver content In the alloy of the present invention, the inclusion of silver has the effect of improving mechanical strength, but if it is less than 0.01% by weight, no improvement effect can be obtained, and if it exceeds 1%. Therefore, the content should be reduced to 0.01 to 1% by weight because it increases the cost even though no outstanding effects can be expected.
It was determined that

■Content of rare earth elements In the alloy of the present invention, the inclusion of rare earth elements has the effect of improving mechanical strength.

The rare earth element refers to an element of the lanthanoid series in group 11IA of the periodic table, and may contain two or more types. In this case, Mitsushmetal (hereinafter referred to as rMm), which is a mixture of lanthanoid elements, is preferably used. If the weight percentage of O used is less than 1%, no improvement in mechanical strength can be obtained;
If it exceeds 5%, brittleness increases significantly, so the weight percentage is set at 0.1 to 5%.

(Function) In the present invention, since the main components are copper and aluminum, mechanical strength is ensured and castability and workability are good.

In the present invention, mechanical strength, mechanical strength, and surface hardness are improved by containing manganese, iron, zinc, etc., and oxidation resistance and toughness are improved by containing nickel.

In the present invention, since silver is contained, mechanical strength is improved.

In the present invention, since one or more rare earth elements are contained, the mechanical strength is improved.

(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

1-5, 1-3 Regarding the present invention alloy and comparative example alloy as shown in Table 1, the alloys were melted and cast using a closed sand casting mold to prepare test pieces. For this test piece, respectively,
Tensile strength and Brinell hardness were measured. In addition, as raw materials, high purity materials with a purity of 99.99% or more were used for each component. The results are shown in Table 1.

(The following is a blank space) Table 1 As is clear from Table 1, the alloy of the present invention has a tensile strength of 60 to 70 kg/-2 and a Brinell hardness of 140 to 170 H.
However, in the case of the comparative example alloys, none of the values were satisfactory.

1"[12"] - Regarding the present invention alloy and comparative example alloy as shown in Table 2, the alloys were melted and cast using a closed sand casting mold to prepare test pieces. For this test piece, respectively,
Tensile strength and Brinell hardness were measured. In addition, as raw materials, high purity materials with a purity of 99.99% or more were used for each component. The results are shown in Table 2.

(The following is a blank space) As is clear from Table 2, the alloy of the present invention has a tensile strength of 70 kg/ha! Although Brinell hardness values of 1170HB or more were shown above, the alloys of comparative examples were not satisfactory in any case.

Examples 11-15 For the present invention alloy and comparative alloy shown in Table 3, the alloys were melted and cast using a closed sand casting mold to prepare test pieces. For this test piece, respectively,
Tensile strength and Brinell hardness were measured. In addition, as raw materials, high purity materials with a purity of 99.99% or more were used for each component. The results are shown in Table 3.

(Left below) As is clear from Table 3, the alloy of the present invention exhibited a tensile strength of 70 kg/m or more and a Brinell hardness of 170 HB or more, but the alloy of the comparative example had a satisfactory value in both cases. It wasn't worth it.

(Effect of the invention) The high strength alloy of the present invention has a weight percentage of 5 to 15% aluminum, 0.5 to 5% iron, 0.1 to 3% nickel and/or cobalt, 0.5 to 2% manganese, and zinc. Since the content is 0.5 to 2% and the balance is copper and unavoidable impurities, mechanical strength is ensured and castability and workability are good.

In addition, the high strength alloy of the present invention has a weight percentage of 5 to 15% aluminum, 0.5 to 5% iron, 0.1 to 3% nickel and/or cobalt, and 0.5 to 2% manganese.
, zinc 0. Since it consists of 5 to 2% silver, 0.01 to 1% silver, and the balance copper and unavoidable impurities, it ensures mechanical strength and has good casting and workability.

In addition, the high strength alloy of the present invention has a weight percentage of 5 to 15 aluminum.
%, iron 0.5-5%, nickel and/or cobalt O,ll-3%, manganese 0.5-2%, zinc 0.
5 to 2%, 0.1 to 5% of one or more rare earth elements, and the remainder consists of copper and unavoidable impurities, ensuring mechanical strength and making it easy to cast and process. Good properties.

Claims (1)

[Claims] 1. Aluminum 5 to 15%, iron 0.5% by weight
5% to 5%, nickel and/or cobalt 0.1 to 3%, manganese 0.5 to 2%, zinc 0.5 to 2%,
A high-strength mold alloy consisting of copper and unavoidable impurities. 2. Aluminum 5 to 15%, iron 0.5% by weight
5% to 5%, nickel and/or cobalt 0.1 to 3%, manganese 0.5 to 2%, zinc 0.5 to 2%,
A high-strength mold alloy consisting of 0.01 to 1% silver, the balance being copper and unavoidable impurities. 3. Aluminum 5 to 15%, iron 0.5% by weight
5% to 5%, nickel and/or cobalt 0.1 to 3%, manganese 0.5 to 2%, zinc 0.5 to 2%,
One or more rare earth elements 0.1 to 5
%, and the balance is copper and unavoidable impurities.