The material is chromium-molybdenum steel SCM415! It has undergone carburizing and quenching, achieving a hardness of over HRC60!
The process of performing grinding-level machining through turning is called "hard turning." Pistons used in hydraulic systems for construction machinery require extremely high precision, with outer and inner diameter tolerances of ±2 microns, surface roughness of Ra0.4 microns, coaxiality of inner and outer diameters of 3 microns, and perpendicularity between the end face and outer diameter of 3 microns as the required specifications. At our company, after heat treatment, we simultaneously machine the outer diameter, inner diameter, and both end faces using NC lathes, achieving machining equivalent to grinding through turning. By consolidating four processes into one, we enable process shortening and cost reduction. Additionally, simultaneous machining allows us to guarantee the coaxiality of the outer and inner diameters and the perpendicularity to the end face. We have a shipping record of 10,000 units per month and can accommodate orders of up to 100,000 units. *For more details, please refer to the PDF document or feel free to contact us.
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At Koyou Electric Co., Ltd., we support mass production processing (from 100 to 1 million units) of difficult-to-machine materials (such as tungsten, molybdenum, tantalum, Hastelloy, Inconel, etc.) with high precision (±3 microns). We achieve the necessary precision required at the polishing level through cutting processes, ensuring mass production capability. If you have any challenging shapes or fine processing needs, please feel free to contact us.