專業(yè)英語(中) 課堂練習(xí).ppt

1、引擎燈光，oneoftheoldestmetalremovalmachines， hasanumberofusefulanddesirableattributes.todaytheselathesareusedprimarilyinsmallplantswheresmallerquantitiesratherthanlarger c olerancesfortheenginelathedependprimarilyontheskilloftheoperator.thedesignengineermustbecarefft golerancesofanexperimentalparar engi

2、nelathebyaskilledoperator.inredesigninganexperimentalpartforproort打開。 economicaltolerancesshouldbeused.theenginelathehasbeenreplacedintodaysproductionplantsbyawidevarietyofautomaticlathessuchach r automatic screw machines、and automatic tracer (仿效) lathes .assembly of machinery、whentwoshaftsarenotinl

3、ineorareafewthousandthh theyareforcedintoconnectionbyrigidcouplings.theresultingstressessintheshaftsbecomereversingstresseswhentheshaftsarerotated r recection 當(dāng)whenperfectalignmentcannotbeeconomicallyattained，istouseflexiblecouplingswhichcanminimizetheharmfuleffectsofsstained軸旋轉(zhuǎn)時(shí)通常，使用柔性聯(lián)軸器可以在兩個(gè)軸之間不能

4、經(jīng)濟(jì)地實(shí)現(xiàn)精確對齊時(shí)減少軸的有害影響。grindingisoneofthemostwidelyusedmethodoffinishingpartstoextremelyclosetolerancesandlowsurfaceroughness.currently。 磨床foralmosteverytypeofgrindingoperations.particulardesignfeaturesofapartdictateto (決定) alarrateto grindingmachinerequired.whereprocessingcostsareexcessive、partsredesig

5、nedtoutilizealessexpensive、higher output grind may be well worthwhile .grindingisoneofthemostwidelyusedmethodoffinishingpartstoextremelyclosetolerancesandlowsurfaceroughness .研、Currently、there are grinders (磨床) foralmosteverytypeofgrindingoperations .目前幾乎有可用于各種類型磨削加工的磨床。 particulardesignfeaturesofapartdictateto (決定) alargedegreethetypeofgrindingmachinerequired .零件的特定的設(shè)定修正特征大大地決定了需要的磨床的種類。whe