A vital part of today’s high-tech industry are turnеd componеnts. Thеy sеrvе as thе foundation for consumеr еlеctronics, mеdical gadgеts, aеronautical engineering, automotive systems applications, and more. CNC (Computer Numerical Control) machining is one of the sophisticated techniques used in the manufacturing of these parts. This procedure is renowned for its accuracy and consistency.
Material Challenges: Silver Nickel Alloy
One of the significant hurdles in turned component manufacturing involves dealing with advanced materials like silver nickel alloy, also referred to as nickel silver. Despite its name, this alloy contains no silver but a combination of copper, nickel, and zinc. It is prized for its corrosion resistance, durability, and attractive silvery appearance. Thus, it is preferred in industries where both form and function are essential.
However, machining silver nickel alloy is far from straightforward. Zinc in the alloy makes it particularly sensitive to environmental pollutants. Such include acid rain and sulfur compounds, leading to surface tarnishing. This degradation can compromise both the aesthetic and structural qualities of the part.
When exposed to certain acids during processing or service, the alloy is vulnerable to stress corrosion cracking. This condition can lead to sudden failure under stress. To maintain material integrity, these characteristics require careful selection of machining environments, tools, and coatings.
Tool Wear and Maintenance
Another challenge for a turned parts manufacturer is tool wear. CNC machines may run continuously for extended periods, especially in high-volume production environments. This relentless usage wears down cutting tools, directly affecting the final product’s accuracy and surface finish.
Materials such as brass, aluminium, and stainless steel have different machining properties. Some are ductile and easy to cut, while others are abrasive or hard, accelerating tool degradation.
Work Hardening in Nickel Alloys
Nickel-based alloys are widely used in industries requiring components with excellent heat resistance and strength. These alloys are notorious for their tendency to “work harden” during machining. Work hardening occurs when a material becomes harder and stronger as it is deformed, which happens naturally during cutting or turning.
While increased hardness might sound beneficial, it creates complications during machining. As the surface hardens, cutting becomes more difficult, often requiring more force and sharper tools. This can slow production rates, increase tool wear, and even cause part deformation, especially in smaller or thinner components.
Customisation and Complex Geometries
Modern CNC machining must cater to a growing demand for customised components with complex geometries. Clients in sectors like electronics, aerospace, and medical devices require parts tailored to very specific functions. Traditional mass production techniques are ill-suited for such variability.
Combined with powerful software, CNC machines allow for the creation of intricate, high-precision parts with minimal manual intervention. The increasing complexity of component designs poses new challenges. Programming machines for elaborate geometries can be time-consuming and error-prone.
