Study on the material character steel bigend bolt.pdfVIP

Study on the material character steel bigend bolt.pdf

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Study on the material character steel bigend bolt

JoURNAL oF CoAL SCIENCE ENGINEERING (CHINA) ISSN 1006—9097 PP 616-620 Vo1.14 No.4 Dec.2008 Studyonthematerialcharactersteelbig-endbolt SHIJian-jun(石建军)’.一,MANian-jie(马念杰)’,ZHANPing(~ 平)’,ZHANGDian.1i(张典礼) (1.SchoolofResourceandSafetyEngineering,ChinaUniversiytofMiningandTechnology(Beijing),Beijing 100083, China;2.SafeytEngineeringCollege,NorthChinaInstituteofScienceandTechnology,Beijing 101601,China) Abstract Basedonthemanufacturingmethodnow usedinourcountry.causedIow bear- ingcapacityinthebolt-end.whichIsapotentiaIdangerintheboltsupportingtunneIanda waste ofmoney.and presented the new typestrong steeIbig—end boltcansolvethis problem.AnalyzedtheactivestateoftheendofboltbyANSYS,wecanknow thatItis very disadvantagewhenboltboreeccentricload.Contrastedwiththedifferentthatcom- monboltandbig.endboltwhentheyborethesameloading.Thecommonboltisbigger thanthebig—endboltjnstressvalue.StudyOl3theprocessingtechnicofthenew typeof thestrongsteeIbig.endbolt.thenew metalbig.endboltwasproducedbyheatprocessing overbig.end boltandupset.From themicroscopicexaminationonboltmetal。itiscon- cludedthatheatprocessingonthebolt—endrefinesthecrystaIgrainofthemetaImateria1. whichnotonlyincreaseitsextensionbutimproveItsproperty.Moreoverthestrengthability oftheboltmateriaIcanbeexertedcompletely. Keywords big-end bolt,processing technic,microscopic examination,finite element analysis andhighproductionofthemine.Nowadayshighin— Intr0ductiOn tensiyt supportingtechn iquehasbeencommonusedat Tunnelsupportisakeytechniqueincoalmining. homeandabroad,which gainedgreateconomicand A proper,safe,reliabletunn elsupporttechn iqueisa socialbenefits. necessityforaminetomakeahigherproductionefn—

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