【单选题】【消耗次数:1】
刀具切削部分材料的硬度要高于被加工材料的硬度,其常温硬度应在( )。
HRC45-50间
HRC50-60间
HRC60以上
HRC30以上
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相关题目
【单选题】 在设计滚珠丝杠副时所要求的硬度HRC()
①  越小其硬度系数就越小
②  越大其硬度系数就越小
③  越大其硬度系数就越大
④  大小与其硬度系数无关
【单选题】 HRC表示( )。
①  布氏硬度
②  硬度
③  维氏硬度
④  洛氏硬度
【单选题】 下列那种刀具材料硬度最高( )。
①  金刚石
②  硬质合金
③  高速钢
④  陶瓷
【单选题】 切削用量应根据工件材料、硬度、刀具材料及机床等因素来考虑。该说法( )
①  正确
②  错误
【单选题】 刀具材料在高温下能够保持较高硬度的性能称为( )。
①  硬度
②  红硬性
③  耐磨性
④  韧性和硬度
【判断题】 硬质合金刀具材料的硬度越大,其抗弯强度就越大。()
①  正确
②  错误
【判断题】 在高温下,刀具切削部分必须具有足够的硬度,这种在高温下仍具有较高硬度的性质称为红硬性。
①  正确
②  错误
【单选题】 提高低碳钢的硬度,改善其切削加工性,常采用()
①  退火
②  正火
③  回火
④  淬火
【判断题】 硬度越大,切削变形就减小()
①  正确
②  错误
【单选题】 布氏硬度
①  布氏硬度
②  洛氏硬度
③  维氏硬度
④  以上方法都不宜
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