职业技能鉴定国家题库—车工中级工技能鉴定试题（Occupation skill appraisal national exam - Turner intermediate skills identification test）.docVIP

职业技能鉴定国家题库—车工中级工技能鉴定试题（Occupation skill appraisal national exam - Turner intermediate skills identification test） Occupation skill appraisal national exam - Turner intermediate skills identification test I. judgment questions: (1 points per game, 25 points) 1 、 worm and worm gear are usually used to transmit two shafts and stagger 60 degrees. 2, when the turning modulus is less than 5MM, the layered cutting method can be used. 3, in the rough car worm, in order to prevent the three cutting edge simultaneously participate in cutting and cause knife phenomenon, generally can use left and right cutting method turning. 4, eccentric parts, the distance between the two buses is called eccentricity. 5, at the beginning of turning eccentric shaft eccentric outer circle, the amount of cutting should not be too large. 6, with a full range of 10MM indicator, not in the two top measuring eccentricity. 7, when turning the slender shaft, in order to reduce the radial force of the tool on the workpiece, the main deflection angle of the tool should be increased as much as possible. 8 、 with four jaw single moving chuck clamping, can not turn the position accuracy and dimensional accuracy requirements of the workpiece. 9, the rotation accuracy, stiffness and vibration resistance of the spindle affect the machining accuracy and surface roughness of the workpiece. 10 when the opening and closing nuts are separated, the sliding plate box and the knife rest can not move. 11 the exchange gears used in turning the thread and turning the worm are not the same. 12, the lathe front and back top unequal height, will make the processing hole assumes the ellipse. Member replies below to see ============================== 13, the process of heat treatment of the workpiece to achieve the desired chemical properties is called the process of heat treatment. 14, in the mechanical processing, in order to ensure the reliability of processing, process margin too much, leaving less than good. 15, in the