EV Lightweighting Trend Drives Sustained Growth in Aluminum Precision Machining

Lightweighting Is Not Optional — It Is Mandatory

One ultimate solution for EV range anxiety is weight reduction. Every 1kg reduction extends range by approximately 1.5km. Aluminum, with its high strength-to-weight ratio, corrosion resistance, and recyclability, is rapidly replacing cast iron and steel.

Challenges in Aluminum Precision Machining

Aluminum seems easy to machine, but precision machining has hidden pitfalls:

• Deformation control: 6061-T6 and 7075-T6 have twice the thermal expansion coefficient of steel — machining thermal deformation is hard to predict
• Surface quality: Aluminum is prone to built-up edge — surface roughness control requires specialized tools and cutting parameters
• Tolerance retention: Thin-wall housing parts experience aging deformation after machining — stress relief and finishing allowance are mandatory

Bisite Approach

We have established a dedicated process system for aluminum precision machining:

• 4-hour natural aging after roughing, then finishing
• Custom PCD tooling to reduce built-up edge
• In-process temperature monitoring with constant-temperature coolant

Bisite currently ships over 5,000 aluminum precision parts per month, covering battery pack housings, motor shells, steering knuckles, water pump housings, and other key components. Automotive delivery pace is fast, but quality standards never drop.