SCBN TOOLS CBN Inserts: The Core Tool for High-Speed Milling in Engine Repair

The milling and repair accuracy of core components such as engine cylinder blocks directly determines the overall repair quality and secondary service life of the engine.  Repair conditions are complex; gray cast iron cylinder blocks are prone to wear from hard spots, and thin-walled aluminum alloy cylinder blocks are susceptible to deformation during milling.  Precise leveling of defects is required, demanding tool wear resistance, stability, and adaptability far exceeding those required for new machine processing.

SCBN TOOLS CBN inserts, with their advantages of ultra-high hardness, wear resistance, high-temperature stability, and customized adaptability, precisely address the challenges of repair milling for different material components and provide targeted selection solutions:

1. For gray cast iron cylinder block/cylinder head repair, we use RNGN0903 and RNGN1203 series round CBN inserts (both solid and full-face types).  These inserts allow for large depths of cut, enabling efficient machining of worn layers and hard spots, while also providing wear resistance and impact resistance, preventing secondary damage;

2. For aluminum alloy cylinder block/piston repair, we use the same series of round PCD full-face inserts to precisely repair scratches and deformed areas, ensuring surface accuracy and dimensional consistency for subsequent assembly;

3. For steel components (crankshaft seats, valve seats) repair, we customize inserts with specific materials and grades based on the degree of wear and milling conditions, ensuring stability and precision.

Application Cases

A large engine repair company used this technology to repair gray cast iron cylinder blocks of diesel engines.  With optimized cutting parameters of Vc=1000m/min and fr=0.12mm/r, tool life was extended by 20% compared to imported tools, and the overall repair cost per engine was reduced by 25%. In the repair of scratches on aluminum alloy cylinder blocks of new energy vehicles, it can continuously process 600 pieces without significant wear, achieving a 100% pass rate for cylinder bore dimensional consistency, significantly improving repair capacity and quality.