材料成型及控制工程专业英语配套教学课件刘瑛电子课件 Unit 9.ppt

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1、Unit9Metalcastingprocess金属铸造工艺ObjectiveKnowwhatkindofpartscanbeproducedbycastingBefamiliarwithtwomaintypesofcastingUnderstandthemethodofmoldmakingIntroduceexamplescorrectlyWarmingupWorkingroupsandstudy;Discussthesimilaritiesbetweenthechocolatemakingandcastingprocess.

2、Task1AnswerThematerialismeltfirst.(2)Thematerialispouredintoacavity.(3)Thefinalpartissolidifiedwhenitiscooled.WarmingupLookatthepictures,findwhichmetalproductsintheFig.9-2aremadebycasting.Task2WarmingupAnswer(a)(c)(e)(f)WarmingupWatchVideo9-1andVideo9-2,andputthefoll

3、owingtextsintherightorderaccordingtoFig.9-3.Task3Answer(d)(f)(a)(e)(b)(c)WarmingupReadthetextandanswerthefollowingquestions:Whatarethefunctionsofthepatternandthecore?Whatarethethreestepsinmoldmaking?Task4Answer(1)Apatternisusedtoformthecavity.Thecoreisusedtoformthein

4、ternalfeaturesthatcannotbeformedbythepattern.(2)The3stepsare:positioningthepattern,packingthesandandremovingthepattern.TextWatchVideo9-3tounderstandthecentrifugalcastingprocess.Readthefollowingtextandfillintheblankswithtopicssentencesofthefiveparagraphsfromthechoices

5、below.Task5Answer(1)d(2)a(3)c(4)b(5)eIntroducingexamplesLanguageStudyThereareseveralphrasesthatarecommonlyusedwhenintroducingexamples:forexampleforinstancee.g.(exempligratia(Latin))suchasIncludingBreakthemupinto2groups,lookattheexamplesinthebook.Thefollowingsentences

6、usethephrasesinthislesson.Ifasentenceiscorrect,putacheck(√)nexttoit.Ifasentenceisincorrect,fixit.Task6LanguageStudyAnswerLanguageStudySituationPracticeWorkinpairs.Onewillintroducethebasicknowledgeofsandcasting,andtheothermayaskanyquestions.Dousetheexpressionsyoulearn

7、edinthisUnittolisttheexamples.Thenexchangeyourrolesanddoitagain.Task7