【填空题】
21118.___同一基本尺寸,同一公差等级的孔和轴的标准公差值相等。
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【填空题】
21119.___在数控车床上加工螺纹,主轴编码器起到了主轴转动与进给运动的联系作用。
【填空题】
21120.___若两个零件的实际尺寸相等,则它们的作 用尺寸一定也相等。
【填空题】
21121.___对同一被测表面,表粗糙度参数 Ra 值与 Rz 相等。
【填空题】
21122.___φ30m5,φ30m6,φ30m9 公差带的基本偏差相同。
【填空题】
21123.___最小侧隙的确定与齿轮精度要求无关。
【填空题】
21124.___轴、孔分别与滚动轴承内、外圈配合时,均应优先采用基孔制。
【填空题】
21125.___偏差可为正、负或零值,而公差只能为正值。
【填空题】
21126.___不需挑选和修配就能装配达到功能要求的零件,是具有互换性的零件。
【填空题】
21127.___一般伺服电机以转矩作为主要参数,而主轴电机以功率作为主要参数。
【填空题】
21128.___同一基本尺寸,同一公差等级的孔和轴的基本偏差相同。
【填空题】
21129.___轴、孔分别与滚动轴承内、外圈配合时,均应优先采用基孔制。
【填空题】
21130.___国家标准规定了基孔制与基轴制两种平行的基准制度,因而实际使用中绝不允许采用非基准孔与非基准轴结合。
【填空题】
21131.___数控系统 I/O 接口电路的主要任务之一是进行必要的电气隔离,防止干扰信号引起误动。
【填空题】
21132.___滚动轴承的精度等级是根据内、外径的制造精度来划分的。
【填空题】
21133.___KV 愈大,同一速度下的跟随误差愈小,系统轮廓精度愈高。
【填空题】
21134.___内径为φ50 的滚动轴承与φ50k5 的轴颈配合,其配合性质是间隙配合。
【填空题】
21135.___最大实体要求、最小实体要求都只能用于中心要素。
【填空题】
21136.___从制造上讲,基孔制的特点就是先加工孔,基轴制的特点就是先加工轴。
【填空题】
21137.___过渡配合可能具有间隙,也可能具有过盈,因此,过渡配合可能是间隙配合,也可能是过盈配合。
【填空题】
21138.___Z 坐标运动由传递切削动力的主轴所规定。
【填空题】
21139.___相啮合的两个齿轮,都存在着基节偏差,对传动平稳性无影响。
【填空题】
21140.___气动技术的最终目的是利用压缩空气来驱动不同的机械装置。
【填空题】
21141.___为保证齿轮传动的平稳性应同时限制基节偏差与齿形误差。
【填空题】
21142.___为使零件的几何参数具有互换性,必须把零件的加工误差控制在给定的范围内。
【填空题】
21143.___公差可以说是允许零件尺寸的最大偏差。
【填空题】
21144.___数控机床在手动和自动运行中,一旦发现异常情况,应立即使用紧急停止按钮。
【填空题】
21145.___当进行螺纹切削时,如果编码器反馈信号断开,则会出现主轴停止,进给继续的故障。
【填空题】
21146.___基孔制配合要求孔的精度高,基轴制配合要求轴的精度高。
【填空题】
21147.___“进给保持”的意思是按给定的进给速度保持进给运动。
【填空题】
21148.___机床的操练、调整和修理应有经验或受过专门训练的人员进行。
【填空题】
21149.___对一般的紧固螺纹来说,螺栓的作用中径应小于或等于螺母的作用中径。
【填空题】
21150.___定位公差带具有确定的位置,但不具有控制被测要素的方向和形状的职能。
【填空题】
21151.___定向公差带相对于基准有确定的方向,并具有综合控制被测要素的方向和形状的能力。
【填空题】
21152.___形状误差包含在位置误差之中。
【填空题】
21153.___建立基准的基本原则是基准应符合最小条件。
【填空题】
21154.___绘制齿轮工作图时,必须在齿轮的三个公差组中各选一个检验项目组标在齿轮图样上。
【填空题】
21155.___同一个齿轮的齿距累积误差与其切向综合误差的数值是相等的。
【填空题】
21156.___在外圆车削加工时,背吃刀量等于待加工表面与已知加工表面间的距离。
【填空题】
21157.___数控机床驱动主要采用交流驱动,是因为交流电机比直流电机调速性能好。
【填空题】
21158.___齿轮加工时的进给运动为齿轮坯的啮合转动。
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take a toll on,in other words ,drop out,in turn ,at risk (of) ,interfere with,be accustomed to, contribute to,cut back on ,hold on to
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take a toll on,in other words ,drop out,in turn ,at risk (of) ,interfere with,be accustomed to, contribute to,cut back on ,hold on to
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controversial,assess, resolve,decrease,alter,abandon,indicate,undermine,compromise, conventional
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make it, with open arms ,strip off,keep back,
free of/ from ,after all,straighten up, throw away
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make it, with open arms ,strip off,keep back,
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