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1 研究开发的目的外径大至(?)150mm 左右的轴承用轴承环毛坯虽然可采用锻造——冷轧法进行高效率的生产,但是,外径在(?)150mm 以上的轴承用轴承环毛坯采用热轧的方法制造,在供应和质量方面都存在问题。
1 Research and Development Objectives Although the bearing ring blank with the outer diameter of about 150 mm can be produced efficiently by the forging-cold rolling method, the bearing ring with the outer diameter of 150 mm or more Billets are manufactured by hot rolling and have problems in terms of supply and quality.