Automotive Industry

Motor housings are generally thinner and more structurally complex than gearbox housings, and integrated multi-functional structures will be a future trend.
High precision, large diameter and easy-to-deform thin walls are the main characteristics of current motor housing machining.

Cast iron materials, primarily gray cast iron and ductile iron, remain in use for diesel engines and some gasoline engines. In recent years, the usage of compacted graphite iron (CGI) has also been steadily increasing.

Passenger vehicle cylinder blocks and heads are typically made of cast aluminum alloy, while commercial vehicle cylinder blocks remain primarily cast iron. These materials have low hardness, are prone to built-up edge (BUE) formation, and produce high levels of burrs. Machining processes are characterized by long cycle times, numerous dimensional features, and components sensitive to temperature changes, with critical bores requiring high dimensional accuracy and strict CPK (Process Capability Index) compliance. Primary operations include face and hole machining, with additional requirements for knurling and bimetal machining. Driven by extreme efficiency demands, a wide range of custom composite tools are used to support high-volume, automated production.

Crankshafts are primarily made of cast iron or steel components. Special attention must be paid to chip breaking when machining steel crankshafts.

The dominant material for turbocharger housings on the market is high-nickel austenitic stainless steel, which presents the following key machining characteristics: 1. Prone to built-up edge (BUE) formation and high cutting forces; 2. Exhibits work hardening and springback tendency after machining; 3. Has poor thermal conductivity.