CN101705389A - Copper alloy for manufacturing mould and preparation method thereof - Google Patents

Abstract

The invention discloses copper alloy for manufacturing a mould and a preparation method thereof. The copper alloy consists of the following components in percentage by mass: 1.10 to 1.70 percent of Ni, 0.20 to 0.40 percent of Co, 0.10 to 0.40 percent of Be, 0.08 to 0.20 percent of Zr, 0.02 to 0.10 percent of Y, 0.02 to 0.05 percent of Ce, and the balance of Cu; and the copper alloy is prepared by processing steps of melting, pouring, hot forging, solid solution, cold forging and ageing. The copper alloy for manufacturing the mould has the characteristics of high strength and high thermal conductivity, and can also be used for welded joint discs and the like used on spot-welding electrodes and stainless steel besides being used for manufacturing injection moulds and nonferrous metal low-pressure die casting moulds with high thermal conductivity.

Description

A kind of copper alloy that is used for mfg. moulding die and preparation method thereof

Technical field

The invention belongs to the Cu alloy material technical field, relate to a kind of polynary low beryllium content copper alloy, more specifically relate to a kind of copper alloy that is used for mfg. moulding die and preparation method thereof.

Background technology

Injection mold cavity is inserted, core, thermal component, and the low pressure die casting mould of copper alloy and aluminium alloy requires moulding stock to have higher-strength, hardness, heat transfer heat dispersion and resistance to elevated temperatures.The domestic moulding stock that is used for the industry generally is the beraloy of high comprehensive performance at present, the main trade mark has: C17500, C17200 etc., this type of copper alloy contains the beryllium or the cobalt element of higher amount, make that the production cost of material is very high, higher beryllium element can cause the pollution of environment and the harm of the person in the alloy production process.Publication number be CN101148717 and publication number be CN101333609 patent disclosure two kinds of nickel cobalt copper beryllium molds, though the content of beryllium cobalt decrease, but beryllium cobalt mass percent is respectively more than 0.45% and 0.90%.In order to reduce cost, reduce the over-all properties of pollution, increase mould alloy material, polynary copper alloy with low beryllium provided by the invention, the beryllium cobalt contents adopts multi-element alloyed mode to improve intensity, the hardness of alloy, and obtains higher electrical and thermal conductivity performance far below above beryllium copper.

Summary of the invention

The objective of the invention is the pollution that causes aborning for fear of injection mold, low pressure die casting moulding stock, reduce the cost of moulding stock, improve the over-all properties of material, overcome the defective that prior art exists, a kind of high strength, high thermal conductivity, heat-resisting, high life are provided, contain copper alloy of Ni, Co, Be, Zr, Y, Ce alloying element and preparation method thereof.

To achieve these goals, technical scheme of the present invention is:

A kind of copper alloy that is used for mfg. moulding die, by mass percentage by component Ni be 1.10～1.70%, Co is 0.20～0.40%, Be is 0.10～0.40%, Zr is 0.08～0.20%, Y is 0.02～0.10%, Ce is 0.02～0.05%, surplus is that Cu forms, and each constituent mass sum is 100%.

Above-mentioned its purity of described Cu is 〉=99.95%;

Above-mentioned its purity of described Ni is 〉=99.90%;

Above-mentioned its purity of described Co is 〉=99.80%;

Above-mentioned its purity of described Y is 〉=99.90%;

Above-mentioned its purity of described Ce is 〉=99.00%;

Above-mentioned described Be is the Cu-Be master alloy, and wherein the massfraction of Be is 3.8～4.3%, is technical grade;

Above-mentioned described Zr is the Cu-Zr master alloy, and wherein the massfraction of Zr is 8～12%, is technical grade.

To achieve these goals, another technical scheme of the present invention is:

A kind of preparation method who is used for the copper alloy of mfg. moulding die comprises the steps:

Step (1): behind claim 1 prescription, melting in medium-frequency induction furnace, casting ingot-forming;

Step (2): in 920 ℃～720 ℃ temperature ranges, forge deflection 〉=45%;

Step (3): 940 ℃～960 ℃ solution treatment, quench treatment then, quenching water temperature≤40 ℃;

Step (4): cold-forge forming, deflection are 20～40%;

Step (5): the blank behind the cold forging is carried out ageing treatment at 450 ℃～470 ℃, in air, cool off.

A kind of copper alloy that is used for mfg. moulding die of the present invention and preparation method thereof has following advantage:

1, copper alloy of the present invention contains that Co is 0.20～0.40%, Be is 0.10～0.40%, and the beryllium cobalt contents is far below present berylliumbronze moulding stock, thereby has reduced environmental pollution, has reduced cost;

2, preparation technology is simple, the lumber recovery height, is easy to machine-shaping;

3, the over-all properties that has high strength, high thermal conductivity, its main performance index is as follows:

Tensile strength (Mpa)	Yield strength (Mpa)	Hardness (HB)	Elongation δ 5?％	Electric conductivity %IACS	Thermal conductivity (W/m K)	Softening temperature ℃
							??≥720	??≥590	??≥235	?≥15	??≥55	??≥230	??≥550℃

Embodiment

Below in conjunction with embodiment a kind of copper alloy that is used for mfg. moulding die of the present invention and preparation method thereof is described in further detail.

Embodiment 1:

Alloying constituent is (wt%) Ni:1.30, Co:0.30, Be:0.30, Zr:0.15, Y:0.02, Ce:0.05, and surplus is Cu, and each constituent mass sum is 100%.

The preparation method is: adopt the medium-frequency induction furnace melting, use the swage casting ingot-forming; Forge deflection 45% in 920 ℃～720 ℃ temperature ranges; 950 ℃ of solution treatment, quench treatment then, 25 ℃ of quenching water temperatures; Cold forging is handled, and deflection is 30%; Blank behind the cold forging is carried out ageing treatment at 460 ℃, in air, cool off.

Through above-mentioned preparation, the performance index of the copper alloy that obtains are: tensile strength is 725Mpa, and yield strength is 590Mpa, and hardness is 237HB, and elongation is 22%, and electric conductivity is 60%IACS, and conductivity is 245W/mK, and softening temperature is 610 ℃.

Embodiment 2:

Alloying constituent is (wt%) Ni:1.10, Co:0.40, Be:0.10, Zr:0.20, Y:0.10, Ce:0.02, and surplus is Cu, and each constituent mass sum is 100%.

The preparation method is: adopt the medium-frequency induction furnace melting, use the swage casting ingot-forming; Forge deflection 55% in 920 ℃～720 ℃ temperature ranges; 940 ℃ of solution treatment, quench treatment then, 25 ℃ of quenching water temperatures; Cold forging is handled, and deflection is 40%; Blank behind the cold forging is carried out ageing treatment at 470 ℃, in air, cool off.

Through above-mentioned preparation, the performance index of the copper alloy that obtains are: tensile strength is 720Mpa, and yield strength is 593Mpa, and hardness is 235HB, and elongation is 20%, and electric conductivity is 62%IACS, and conductivity is 248W/mK, and softening temperature is 570 ℃.

Embodiment 3:

Alloying constituent is (wt%) Ni:1.70, Co:0.20, Be:0.40, Zr:0.08, Y:0.08, Ce:0.04, and surplus is Cu, and each constituent mass sum is 100%.

The preparation method is: adopt the medium-frequency induction furnace melting, use the swage casting ingot-forming; Forge deflection 50% in 920 ℃～720 ℃ temperature ranges; 960 ℃ of solution treatment, quench treatment then, 25 ℃ of quenching water temperatures; Cold forging is handled, and deflection is 20%; Blank behind the cold forging is carried out ageing treatment at 450 ℃, in air, cools off.

Through above-mentioned preparation, the performance index of the copper alloy that obtains are: tensile strength is 738Mpa, and yield strength is 601Mpa, and hardness is 241HB, and elongation is 15%, and electric conductivity is 55%IACS, and conductivity is 230W/mK, and softening temperature is 550 ℃.

Claims (3)

1. copper alloy that is used for mfg. moulding die, it is characterized in that: this copper alloy by mass percentage by component Ni be 1.10～1.70%, Co is 0.20～0.40%, Be is 0.10～0.40%, Zr is 0.08～0.20%, Y is 0.02～0.10%, Ce is 0.02～0.05%, surplus is that Cu forms, and each constituent mass sum is 100%.

2. a kind of copper alloy that is used for mfg. moulding die as claimed in claim 1 is characterized in that: its purity of described Cu is 〉=99.95%; Its purity of described Ni is 〉=99.90%; Its purity of described Co is 〉=99.80; Its purity of described Y is 〉=99.90%; Its purity of described Ce is 〉=99.00%; Described Be is the Cu-Be master alloy, and wherein the massfraction of Be is 3.8～4.3%, is technical grade; Described Zr is the Cu-Zr master alloy, and wherein the massfraction of Zr is 8～12%, is technical grade.

3. a kind of preparation method who is used for the copper alloy of mfg. moulding die as claimed in claim 1 is characterized in that: comprise the steps:

Step (1): behind claim 1 prescription, adopt the medium-frequency induction furnace melting, casting ingot-forming;

Step (2): in 920 ℃～720 ℃ temperature ranges, forge deflection 〉=45%;

Step (3): 940 ℃～960 ℃ solution treatment, quench treatment then, quenching water temperature≤40 ℃;

Step (4): cold-forge forming, deflection are 20～40%;

Step (5): the blank behind the cold forging is carried out ageing treatment at 450 ℃～470 ℃, in air, cool off.