C18000 copper, also known as Copper Chromium Nickel Silicon (CCNS), is a high-performance copper alloy known for its excellent mechanical and electrical properties. This copper alloy is widely used in industries such as aerospace, automotive, and electronics, where high strength, conductivity, and durability are essential. In this comprehensive guide, we will explore the key aspects of machining C18000 copper, including its properties, machining techniques, and best practices to achieve optimal performance.
Introduction to C18000 Copper
C18000 copper is a high-strength copper alloy that contains chromium, nickel, and silicon. These elements provide the alloy with exceptional mechanical properties, such as high tensile strength, wear resistance, and fatigue resistance. Additionally, C18000 offers excellent electrical conductivity, making it a popular choice for electrical and electronic applications.
Some of the common applications of C18000 copper include:
Electrical connectors and contacts
Switchgear components
Resistance welding electrodes
Circuit breaker parts
Bearing and bushing applications
Properties of C18000 Copper
Understanding the properties of C18000 copper is crucial for successful machining. Some of the key properties of this copper alloy include:
Tensile strength: C18000 copper has a high tensile strength, ranging from 85,000 to 95,000 psi. This makes it suitable for applications requiring high strength and durability.
Electrical conductivity: With an electrical conductivity of 45-60% IACS (International Annealed Copper Standard), C18000 copper is an excellent conductor of electricity.
Wear resistance: The presence of chromium, nickel, and silicon in C18000 copper gives it excellent wear resistance, making it suitable for applications where wear and tear are common.
Machinability: C18000 copper has good machinability, with a rating of 20% (relative to pure copper). This means that it can be easily machined using standard machining techniques.
Machining Techniques for C18000 Copper
To achieve optimal performance when machining C18000 copper, it is essential to use the appropriate techniques. Some of the most common machining techniques for C18000 copper include:
Turning: Turning is a common machining process used for shaping C18000 copper. When turning this alloy, it is recommended to use high-speed steel (HSS) or carbide tools, with a positive rake angle and sharp cutting edges.
Milling: Milling is another popular machining technique for C18000 copper. It is essential to use sharp cutting tools with a positive rake angle and adequate chip clearance. Additionally, using a climb milling technique can help reduce the cutting forces and improve surface finish.
Drilling: When drilling C18000 copper, it is crucial to use a high-speed steel (HSS) or carbide drill bit with a 118～ to 135～ point angle. Proper lubrication and coolant are also essential to prevent the drill bit from overheating and to ensure smooth chip evacuation.
Tapping: Tapping is used to create internal threads in C18000 copper. It is recommended to use high-speed steel (HSS) or carbide taps with a spiral point or spiral flute design. Proper lubrication is crucial to prevent galling and ensure smooth chip evacuation.
Best Practices for Machining C18000 Copper
To achieve optimal performance when machining C18000 copper, it is essential to follow some best practices. These include:
Proper tool selection: Using the right tooling is crucial for successful machining of C18000 copper. High-speed steel (HSS) or carbide tools with sharp cutting edges and a positive rake angle are recommended.
Adequate lubrication and coolant: Proper lubrication and coolant are essential for preventing tool wear and ensuring smooth chip evacuation. A water-soluble cutting fluid or a sulfurized oil can be used for this purpose.
Optimal cutting parameters: Choosing the right cutting parameters, such as cutting speed, feed rate, and depth of cut, is crucial for achieving the desired surface finish and dimensional accuracy. It is essential to start with conservative cutting parameters and gradually increase them based on the tool performance and workpiece requirements.
Proper workholding: Secure workholding is crucial for preventing workpiece movement and ensuring accurate machining. Using a suitable
