Induction heating technology and how to choose good induction heating equipmentWord下载.docx

Induction heating technology and how to choose good induction heating equipmentWord下载.docx

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Higginsmj

Theclassificationanddistinctionofelectromagneticinductionheating

BritishphysicistFaraday’stoldusthatmagnetictohaveelectricity,Denmark’snaturalphilosopherostertheright-handrule（ampererule）tellsusthatelectricitycanbemagnetic.However,whethermagnetoelectricorelectro-magnetic,theobjectmusthaveagoodcharacteristicofconducting,conducting,orbothconductingandconducting.Becauseitisusuallyonlymetallicmaterialsthatmeettherequirements,onlyahandfulofmaterials,suchasgraphite,areeligible.Sotheelectromagneticinductionheatingtechnologyismainlyappliedtotheheatingofmetalmaterialsandgraphite.

Sohowdoesheatcomefrom?

Deviceoutputalternatingcurrentthroughtheinductor（inductioncoil）,afterclinchadealthemagneticfieldACTSonthemetalartifactsintheelectromagneticfield（orgraphite）.Atthistimeintheworkpiecewillnaturallyproducemanyclosedrotarycurrent（eddycurrent）,thecurrentmaximum（equivalenttoshortcircuitcurrent）.Becausetheelectriccurrenthasthermaleffect（Q=I*I*R*T）,sonaturallyproducedalotofheat.Inaddition,thereisamagnetichysteresislossinsidetheworkpiece,whichalsocausesacertainamountofheatwithintheworkpiece.Asaresult,theworkpieceheatsuprapidlyinaveryshortperiodoftime（inseconds）.Ifneeded,themeltingpointofanymetalmaterialcanbereached,andthegraphiteissublimated.

Accordingtotheoutputdeviceofalternatingcurrentfrequencyisdifferent,accordingtotheworkingfrequencyinductionheatingtechnologycanbedividedintofivecategories:

lowfrequencyinductionheating,mediumfrequencyinductionheating,ultrasonicfrequencyinductionheating,highfrequencyinductionheatingandultra-highfrequencyinductionheating.Asthealternatingcurrentflowsthroughtheconductors,theeffectisthatthecurrenttendstoflowoverthesurfaceoftheconductorasthefrequencyofthecurrentincreases.Therefore,thesefiveinductionheatingmethodshavedifferentproperties.

Features:

1）lowfrequencyinductionheating

Frequencyislowest,frequencyrange:

thefrequencyofworkingfrequency（50HZ）to1KHZ,thefrequencythatiscommonlyusedismoreworkerfrequency.Theheatingthicknessisthelargest,about10-20mm.Itis.Itismainlyusedforheating,annealing,temperingandsurfacequenchingoflargeparts.

2）mediumfrequencyinductionheating

Frequencyrange:

approximately1KHZto20KHZ,typicallyaround8KHZ.Heatdepth,thicknessabout3-10mm.Forlargerworkpiecemore,largediametershaft,largediameterthickwallpipe,bigmodulusgearartifactssuchasheating,annealing,quenchingandtempering,conditioningandsurfacesmallerdiameterofrodredblunt,calcinedpressure,etc.

3）superaudioinductionheating

generally20KHZto40KHZ（sinceaudiofrequencyis20HZto20KHZ,socallitsuperaudio）.Heatdepth,thickness,about2to3mm.Moreusedinmediumdiameterworkpiecedeepheating,annealing,tempering,conditioning,heating,largediameterthin-walledtubesheatwelding,assembly,medium,suchasthegearquenching.

4）highfrequencyinductionheating

usually40KHZto200KHZ,usually40KHZto80KHZ.Heatdepth,thickness,aboutl-2mm.Moredeepheatingforsmallartifacts,red,burntpressure,annealing,tempering,thetempering,surfacequenching,mediumofthediameterofthepipeheatandheatwelding,assembly,smallgearquenching,etc.

Frequencyisrelativelyhighest,frequencyrange:

general200KHZabove,canbeuptoadozenMHZ.Theheatingdepthandtheminimumthicknessareapproximately0.1to1mm.Itisusedtoquench,weld,surfacequenchofsmallpiecesofsmallparts.

Themainadvantagesanddisadvantagesofinductionheating:

1）thereisnoneedtoheatthewholething,butitcanbeheatedselectively,sotheworkpieceislessdeformedandthepowerconsumptionisless.

2）theheatisfast,thesurfaceoxidationanddecarburizationoftheworkpiecearelight,andmostoftheworkisnotrequiredforgasprotection.

Accordingtotheneedtoadjusttheworkingfrequencyandpoweroftheequipment,thesurfacehardeninglayeriscontrolled.Thehardness,strengthandtoughnessofthemartensitictissueofthehardenedlayerarehigh.

4）afterinductionheatingheattreatmentofworkpiece,areasunder