机械设计第十章课后习题答案详解

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1、10-1证明当升角与当量摩擦角符合时，螺纹副具有自锁性。当时，螺纹副的效率所以具有自锁性的螺纹副用于螺旋传动时，其效率必小于50%。10-2解由教材表10-1、表10-2查得　　，粗牙，螺距，中径　　　螺纹升角　　　　，细牙，螺距，　　中径　　　螺纹升角　　对于相同公称直径的粗牙螺纹和细牙螺纹中，细牙螺纹的升角较小，更易实现自锁。10-3解查教材表10-1得　　粗牙螺距中径小径　　螺纹升角　andperformancetestcopiesoftherecord.Ifnecessary,reviewshouldbecarr

2、iedout;4)forspringhangers(includedsimplespring,hangersandconstantsupporthangers)itshouldalsoberecognizedassettingandlockingofloads.5)checkthesurfacequality,foldedlayeringandwithoutcracks,rustandotherdefects.5)aftercompletionofthetestandcontroldrawingnumberonebyon

3、e,byseriesbaled.Coloralloysteelparts,thepartsmarkinginstallationlocationandrotationaboutthedirectionyouwant.7.3.14.hangersinstallation7.3.14.1hangerlayouta.acleardesignofhangershouldbeinstalledstrictlyinaccordancewiththedrawingsanddesignsshallnotbeinstalledwrong,

4、missing,etc.B.ownarrangementofpipingsupportandhangersetandselectionshouldbebasedoncomprehensiveanalysisofgenerallayoutofpipingsystems;coldinstallationofsteampipewithparticularattentionreservedforcompensationofthermalexpansiondisplacementandorientation.C.supportsy

5、stemsshouldberationaltowithstandpipeloads,staticloadandincidentalload;reasonablepipingdisplacement;guaranteedundervariousconditions,stressarewithintheallowedrange.Strength,stiffness,andmeetrequirementstopreventvibrationandsoothingwater,withoutaffectingtheadjacent

6、equipmentmaintenanceandotherpipinginstallationandexpansion.D.equipmentconnectedtotheinterfacetomeetpipelinethrust(torque)limitrequirements;increasethestabilityofpipingsystemstopreventpipeline...Tubewallthickness(mm)2-34-67-10weldformnoslopemouthweldstrengtheningh

7、eighth(mm)1-1.51.5-2weldwidthb(mm)5-67-6hasslopemouthweldstrengtheningheighth(mm)1.5-22weldwidthb(mm)coverhadeachedgeslopemouthabout2mmargonarcweldingweldstrengtheningsurfaceheightandwidthtubewallthickness(mm)2--33--45--6weldformweldstrengtheningheighth(mm)1-1.51

8、.5-22-2.5widthb(mm)　　普通螺纹的牙侧角　，螺纹间的摩擦系数　　　当量摩擦角　　　拧紧力矩　　　由公式　　　　可得预紧力　　拉应力　查教材表9-1得35钢的屈服极限拧紧所产生的拉应力已远远超过了材料的屈服极限，螺栓将损坏。10-4解（1）升角　　　　当量摩擦角　　　　工作台稳定上升时的效率：andp