简介：SinceChinahascarriedoutthestrictervisapolicyfromJune.thereisapopularsayingthatitwillholdforeignvisitorbackfromtravelinginChinaandaffecttherelatedindustrieslargely.Isittrueornot?Let'sobservethisissuefromthefollowingaspects.Basicfigures

简介：Theworkingprofileofwholecycloidalgearismadeupofepicycloidandhypocycloidentirely,accordingtothetheoryofmeshingofgearsandthepropertiesofthecycloid,dealswiththederivationofthepressureangleformulaforthewholecycloidalgearintheory,andrevealschangesofthepressureangleofwholecycloidalgearthroughexamples,findstheapplicationrelationshipsbetweenthepressureangleandotherdesignparametersofthewholecycloidalgear,provesthepossibilitythatthewholecycloidalgearcanbeusedininternalparallelmovegearmechanism,alsoprovidestheoreticfundamentfordesigninginternalparallelmovewholecycloidalgearcorrectly.

简介：Theclosed-diedcoldforgingtechnologyofthebevelgearsusedinJadacarwasinvestigated.Withtheanalysisofthestrainfieldandvelocityfieldoftheplasticdeformationandtheenduredforcesofthedies,thefillingrulesforthemetalwereanalyzedbytheelastic-plasticfiniteelementmethod(FEM).Theresultsshowthatthereisagreatdifferenceamongclosed-diecoldforging,extrusionandforging,asfarasthemetalflowingisconcerned.Theouteraddendumcannotbefilledcompletelyintheclosed-diecoldforgingofthebevelgears,andtheroundanglewillbeformed.Butitdoesnotinfluencetheapplicationofthebevelgears.Atthebeginning,therigidareaisformedinthecavityofthelowerdie.Andthenitwillmoveupwardstosupplythemetalforthegearfilling.Fortheclosed-diecoldforgingofthebevelgears,theforceactingontheupperdieandthelowerdieissignificantlydifferent.