文档介绍：机械设计基础问答题
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbounty continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
c：流体摩擦：两摩擦表面完全被流体层分隔开，表面凸峰不直接接触的摩擦状态；
d：混合摩擦：干摩擦、边界摩擦、流体摩擦处于混合共存状态下的摩擦状态。
试述螺纹牙型的主要种类及应用。
a：三角形螺纹：螺纹牙根厚、强度高、牙型角大，当量摩擦系数大、自锁性能好但传动效率低，适用于联接；
b：矩形螺纹：由于牙型角为0度，传动效率最高，但是精加工困难，磨损后间隙难以补偿，易松动，螺母与螺杆对中心的准确度较差，螺纹根部强度最弱，应用已经很少。
c：锯齿形螺纹：效率较矩形螺纹略低，牙根强度很高，适用于承受单向载荷的螺旋传动；
d：梯形螺纹：牙型角为30度，传动效率较矩形螺纹低，但牙根强度高，当采用剖分螺母时，螺纹磨损后的间隙可以补偿，广泛用于螺旋传动。
螺纹联接的基本类型有哪些？各适用于什么场合？
a：螺栓联接：不需加工螺纹孔，结构简单，装拆方便，多用于被联接件不太厚并需经常拆
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
卸的场合；
b：螺纹联接：用于被联接之一较厚，不便加工通孔的场合，但不能经常拆卸，否则会因螺纹孔磨损而导致被联接件磨损；
c：双头螺柱联接：用于被联接件之一太厚不便于穿孔且需经常拆卸或结构上受限制不能采用普通螺栓联接的场合；
d：紧定螺钉：多用于轴上零件的固定，可以传递不大的力和转矩。、
螺纹联接防松的意义及基本意义是什么？
在静载荷和温度变化不大的情况下，联接所用的三角形螺纹都有自锁性，但在冲击、震动和变载荷的作用以及温度变化较大的情况下，联接有可能松动，甚至松脱，不仅影响机器正常工作，有时还会造成严重事故，所以在设计螺栓联接时必须