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在机械部的新产品计划中,有一项是高转速、高强度舫空发动机用的精密轴承。该轴承的保持架为悬梁式,内孔有21个键槽,键槽之间的悬梁窄(2毫米),键槽与外圆间的壁厚很薄(1.5毫米),键槽两侧面光洁度要求高(▽_7)。保持架结构尺寸见图1。保持架材料为CrNiMoA,经调质处理,硬度为HB250左右。由于保持架的材料又硬又粘,较难加工,同时保持架本身结构复杂,强度低,加工时极易
In the new product plan of the Ministry of Machinery, there is a high-speed, high-strength marine engine with precision bearings. The cage of the bearing is cantilever, the inner hole has 21 keyways, the cantilever beam between the keyways is narrow (2mm), the wall thickness between the keyway and the outer circle is very thin (1.5mm), the requirements of both sides of the keyway are high (▽ _7). Cage structure size shown in Figure 1. Cage material is CrNiMoA, quenched and tempered, hardness of about HB250. As the cage material is hard and sticky, more difficult to process, while the cage itself is complex, low strength, easy to process