Preparation method of high-strength and high-conductivity copper alloy load switch knife

A load switch, copper alloy technology, applied in electrical switches, electrical components, circuits, etc., can solve the problems of low production efficiency and high cost, and achieve the effect of stable product performance and low cost

Active Publication Date: 2022-06-28
SIRUI ADVANCED COPPER ALLOY CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0008] In order to solve the problems of high electrical conductivity, medium strength, high temperature resistance or copper-tungsten alloy materials that cannot be simultaneously considered in...
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Method used

Carry out surface Cu2Ag12, Ag8 to the high-strength high-conductivity copper alloy load switch knife that mechanical processing completes to obtain, prevent surface oxidation, increase wear resistance, improve conduction.
The high-strength and high-conductivity copper alloy load switch blade obtained by mechanical processing is carried out surface Cu2Ag12, Ag8 process, prevent s...
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Abstract

The invention discloses a preparation method of a high-strength and high-conductivity copper alloy load switch knife, which is characterized by comprising the following steps: S1, proportioning raw materials; s2, electromagnetic stirring and vacuum melting; s3, casting is conducted; s4, hot extrusion; s5, solid solution treatment; s6, carrying out primary cold drawing; s7, aging treatment; s8, carrying out secondary cold drawing; s9, blanking and punching are carried out; s10, machining is carried out; and S11, surface treatment. The copper alloy load switch tool prepared by the method has the properties of high conductivity, high strength, high temperature resistance and the like; in addition, the preparation method of the copper alloy load switch knife is low in cost and suitable for industrial production.

Application Domain

Technology Topic

Image

  • Preparation method of high-strength and high-conductivity copper alloy load switch knife
  • Preparation method of high-strength and high-conductivity copper alloy load switch knife
  • Preparation method of high-strength and high-conductivity copper alloy load switch knife

Examples

  • Experimental program(4)
  • Effect test(1)

Example Embodiment

[0050] Example 1
[0051] A preparation method of a high-strength and high-conductivity copper alloy load switch knife, comprising the following steps:
[0052] S1. Raw material ratio:
[0053] By mass percentage, the raw materials include: Cr 0.05wt%, rare earth La 0.02wt%, and the balance is Cu; Cu includes three forms: sheet copper plate, long copper plate, copper skin;
[0054] S2. Electromagnetic stirring vacuum melting:
[0055] The feeding sequence is as follows: the sheet copper plate is placed at the bottom, the upper layer is added with long copper plates and placed evenly, the Cr block is wrapped with copper skin and placed in the middle of the copper plate, the rare earth La is wrapped with copper skin and added 5 minutes before being released;
[0056] A vacuum induction furnace is used for smelting and electromagnetic stirring for smelting, and the smelting temperature is controlled at 1150 ° C to obtain a uniform alloy solution; during the smelting process, argon gas is filled for atmosphere protection, and the vacuum degree is maintained at 4.0Pa during the smelting process, and the alloy solution is obtained after smelting ;
[0057] S3, casting:
[0058] First, the alloy solution is refined, degassed and deoxidized, and the alloy solution obtained from S2 continues to heat up. During the heating process, argon is charged into the melting furnace for atmosphere protection and the vacuum degree is kept at 4.0Pa. Adding 0.5% of phosphorus-copper alloy with a phosphorus content of 20wt% relative to the total weight of the obtained uniform alloy solution for deoxidation;
[0059] Then carry out casting with a casting speed of 50mm/min to obtain an alloy ingot; then introduce into a graphite-lined water-cooled crystallizer for cooling and crystallization, and demolding;
[0060] S4, hot extrusion:
[0061] The profile I was extruded by a hot extrusion machine, and the hot extrusion temperature was 850°C; the section specification of the obtained profile I was 9.05*27.75, and the chamfer was R4.5;
[0062] S5, solution treatment:
[0063] The profile I obtained by hot extrusion is placed in a well-type quenching furnace, the heating temperature is 940 ° C, and the temperature is kept for 2 hours, and then water quenching is performed;
[0064] S6, a cold drawing:
[0065] The solution-treated profile I is cold drawn once, and the deformation ratio is controlled at 30% to obtain profile II. The section specification of profile II is 7*26 and the chamfer is R3.5;
[0066] S7, aging treatment:
[0067] The profile II obtained by one cold drawing adopts a trolley furnace, which is kept at a temperature of 460 ° C for 4 hours, and then subjected to aging treatment, and then air-cooled with the furnace;
[0068] S8, secondary cold drawing:
[0069] The aging treated profile II is subjected to secondary cold drawing, and the deformation ratio is controlled at 20% to obtain profile III; the section specification of profile III is 6*25, and the chamfer is R3;
[0070] S9, blanking, punching:
[0071] The profile III is used in a mold to perform blanking, contact forming, punching processing, and forming a load switch knife blank;
[0072] S10. Machining:
[0073] Drilling, chamfering and grooving are carried out in a machining center to obtain a high-strength and high-conductivity copper alloy load switch knife.
[0074] S11. Surface treatment:
[0075] The surface of the high-strength and high-conductivity copper alloy load switch blade obtained by machining is treated with Cu2Ag12 and Ag8 to prevent surface oxidation, increase wear resistance and improve conductivity. The appearance of the switch knife prepared in this example is as follows figure 1 shown.

Example Embodiment

[0076] Example 2
[0077] A preparation method of a high-strength and high-conductivity copper alloy load switch knife, comprising the following steps:
[0078] S1. Raw material ratio:
[0079] By mass percentage, the raw materials include: Cr 0.058wt%, rare earth La 0.03wt%, and the balance is Cu; Cu includes three forms: sheet copper plate, long copper plate, copper skin;
[0080] S2. Electromagnetic stirring vacuum melting:
[0081] The feeding sequence is as follows: the sheet copper plate is placed at the bottom, the upper layer is added with long copper plates and placed evenly, the Cr block is wrapped with copper skin and placed in the middle of the copper plate, the rare earth La is wrapped with copper skin and added 5 minutes before being released;
[0082] A vacuum induction furnace is used for smelting and electromagnetic stirring is used for smelting, and the smelting temperature is controlled at 1200 ° C to obtain a uniform alloy solution; during the smelting process, argon gas is filled for atmosphere protection, and the vacuum degree is maintained at 3.0Pa during the smelting process, and the alloy solution is obtained after smelting ;
[0083] S3, casting:
[0084] First, the alloy solution is refined, degassed and deoxidized, and the alloy solution obtained from S2 continues to heat up. During the heating process, argon is charged into the melting furnace for atmosphere protection and the vacuum degree is kept at 3.0Pa. The obtained uniform alloy solution is deoxidized by adding 0.5% phosphorus-copper alloy with a phosphorus content of 20wt% relative to its total weight;
[0085] Then cast, with a casting speed of 70mm/min, to obtain an alloy ingot; then introduce into a graphite-lined water-cooled crystallizer for cooling and crystallization, and demould;
[0086] S4, hot extrusion:
[0087] The profile I was extruded by a hot extrusion machine, and the hot extrusion temperature was 860°C; the section specification of the obtained profile I was 9.05*27.75, and the chamfer was R4.5;
[0088] S5, solution treatment:
[0089] The profile I obtained by hot extrusion is placed in a well-type quenching furnace, the heating temperature is 950 ° C, and the temperature is kept for 2 hours, and then water quenching is performed;
[0090] S6, a cold drawing:
[0091] The solution-treated profile I is cold drawn once, and the deformation ratio is controlled at 33% to obtain profile II. The section specification of profile II is 7*26 and the chamfer is R3.5;
[0092] S7, aging treatment:
[0093] Use a trolley furnace for the profile II obtained by one cold drawing, keep it at 470°C for 4 hours, carry out aging treatment, and then air-cool with the furnace;
[0094] S8, secondary cold drawing:
[0095] The aged profile II is subjected to secondary cold drawing, and the deformation ratio is controlled at 23% to obtain profile III; the section specification of profile III is 6*25, and the chamfer is R3;
[0096] S9, blanking, punching:
[0097] The profile III is used in a mold to perform blanking, contact forming, punching processing, and forming a load switch knife blank;
[0098] S10. Machining:
[0099] Drilling, chamfering and grooving are carried out in a machining center to obtain a high-strength and high-conductivity copper alloy load switch knife.
[0100] S11. Surface treatment:
[0101] The surface of the high-strength and high-conductivity copper alloy load switch blade obtained by machining is treated with Cu2Ag12 and Ag8 to prevent surface oxidation, increase wear resistance and improve conductivity.
[0102] The material metallographic structure of the high-strength and high-conductivity copper alloy load switch blade prepared in this embodiment is as follows Figure 2-5 shown.

Example Embodiment

[0103] Example 3
[0104] A preparation method of a high-strength and high-conductivity copper alloy load switch knife, comprising the following steps:
[0105] S1. Raw material ratio:
[0106] By mass percentage, the raw materials include: Cr 0.2wt%, rare earth La 0.05wt%, and the balance is Cu; Cu includes three forms: sheet copper plate, long copper plate, copper skin;
[0107] S2. Electromagnetic stirring vacuum melting:
[0108] The feeding sequence is as follows: the sheet copper plate is placed at the bottom, the upper layer is added with long copper plates and placed evenly, the Cr block is wrapped with copper skin and placed in the middle of the copper plate, the rare earth La is wrapped with copper skin and added 5 minutes before being released;
[0109] A vacuum induction furnace is used for melting and electromagnetic stirring is used for melting, and the melting temperature is controlled at 1400 ° C to obtain a uniform alloy solution; during the melting process, argon gas is charged for atmosphere protection, and the vacuum degree is maintained at 2.0Pa during the melting process, and the alloy solution is obtained after melting. ;
[0110] S3, casting:
[0111] First, the alloy solution is refined, degassed and deoxidized, and the alloy solution obtained from S2 continues to heat up. During the heating process, argon is charged into the melting furnace for atmosphere protection and the vacuum degree is kept at 2.0Pa. The obtained uniform alloy solution is deoxidized by adding 0.5% phosphorus-copper alloy with a phosphorus content of 20wt% relative to its total weight;
[0112] Then carry out casting with a casting speed of 100mm/min to obtain an alloy ingot; then introduce into a graphite-lined water-cooled crystallizer for cooling and crystallization, and demould;
[0113] S4, hot extrusion:
[0114] The profile I was extruded by a hot extrusion machine, and the hot extrusion temperature was 900°C; the section specification of the obtained profile I was 9.05*27.75, and the chamfer was R2.5;
[0115] S5, solution treatment:
[0116] The profile I obtained by hot extrusion is placed in a well-type quenching furnace, the heating temperature is 960 ° C, and the temperature is kept for 2 hours, and water quenching is performed;
[0117] S6, a cold drawing:
[0118] The solution-treated profile I is cold drawn once, and the deformation ratio is controlled at 35% to obtain profile II. The section specification of profile II is 7*26 and the chamfer is R1.5;
[0119] S7, aging treatment:
[0120] Use a trolley furnace for the profile II obtained by one cold drawing, keep it at a temperature of 480 ° C for 4 hours, carry out aging treatment, and then air-cool with the furnace;
[0121] S8, secondary cold drawing:
[0122] The aging-treated profile II is subjected to secondary cold drawing, and the deformation ratio is controlled at 25% to obtain profile III; the section specification of profile III is 6*25, and the chamfer is R1;
[0123] S9, blanking, punching:
[0124] The profile III is used in a mold to perform blanking, contact forming, punching processing, and forming a load switch knife blank;
[0125] S10. Machining:
[0126] Drilling, chamfering and grooving are carried out in a machining center to obtain a high-strength and high-conductivity copper alloy load switch knife.
[0127] S11. Surface treatment:
[0128] The surface of the high-strength and high-conductivity copper alloy load switch knife obtained by machining is treated with Cu2Ag12 and Ag8 to prevent surface oxidation, increase wear resistance and improve electrical conductivity.
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PUM

PropertyMeasurementUnit
Conductivity>= 0.95iacs
Tensile strength>= 380.0MPa
Softening temperature>= 400.0°C
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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