工具技术
工具技術
공구기술
TOOL ENGINEERING
2014年
10期
7-10,11
,共5页
杨发展%赵万华%康鲁迪%李青宇
楊髮展%趙萬華%康魯迪%李青宇
양발전%조만화%강로적%리청우
蜂窝状铝合金%高速加工%粘附行为%磨损机制
蜂窩狀鋁閤金%高速加工%粘附行為%磨損機製
봉와상려합금%고속가공%점부행위%마손궤제
cellular aluminium alloy%high speed cutting%adhesion behaviors%wear mechanisms
通过高速铣削试验方法对蜂窝状铝合金高速铣削刀具的粘附行为及粘附机理进行了研究。结果表明,由于初期铝屑粘附在刀具表面上,致使后期切削加工中的铝切屑与刀具表面的化学活性近似,使得铝屑进一步强化粘附在刀具表面,且由于高速加工中产生的高温和高压作用,使得粘附层材料发生变形。后续切屑划擦初期的粘附层,使粘附层出现变形和犁沟现象,加剧刀具与工件间的摩擦状态。同时,铝合金高速加工中高的塑性变形特征是发生粘附磨损的另一重要作用机制。此外,切屑表层材料受到剧烈剪切变形引起表面积增加,使切削形成的金属表面膜破裂,在与刀具表面紧密接触的近乎为真空环境下刀具不断切削新的表面,活性非常高,极易发生摩擦化学反应,较高摩擦化学反应形成的表面厚度达到临界值时将发生磨损,导致刀具粘附磨损加剧。
通過高速鐉削試驗方法對蜂窩狀鋁閤金高速鐉削刀具的粘附行為及粘附機理進行瞭研究。結果錶明,由于初期鋁屑粘附在刀具錶麵上,緻使後期切削加工中的鋁切屑與刀具錶麵的化學活性近似,使得鋁屑進一步彊化粘附在刀具錶麵,且由于高速加工中產生的高溫和高壓作用,使得粘附層材料髮生變形。後續切屑劃抆初期的粘附層,使粘附層齣現變形和犛溝現象,加劇刀具與工件間的摩抆狀態。同時,鋁閤金高速加工中高的塑性變形特徵是髮生粘附磨損的另一重要作用機製。此外,切屑錶層材料受到劇烈剪切變形引起錶麵積增加,使切削形成的金屬錶麵膜破裂,在與刀具錶麵緊密接觸的近乎為真空環境下刀具不斷切削新的錶麵,活性非常高,極易髮生摩抆化學反應,較高摩抆化學反應形成的錶麵厚度達到臨界值時將髮生磨損,導緻刀具粘附磨損加劇。
통과고속선삭시험방법대봉와상려합금고속선삭도구적점부행위급점부궤리진행료연구。결과표명,유우초기려설점부재도구표면상,치사후기절삭가공중적려절설여도구표면적화학활성근사,사득려설진일보강화점부재도구표면,차유우고속가공중산생적고온화고압작용,사득점부층재료발생변형。후속절설화찰초기적점부층,사점부층출현변형화리구현상,가극도구여공건간적마찰상태。동시,려합금고속가공중고적소성변형특정시발생점부마손적령일중요작용궤제。차외,절설표층재료수도극렬전절변형인기표면적증가,사절삭형성적금속표면막파렬,재여도구표면긴밀접촉적근호위진공배경하도구불단절삭신적표면,활성비상고,겁역발생마찰화학반응,교고마찰화학반응형성적표면후도체도림계치시장발생마손,도치도구점부마손가극。
This paper analysis the adhesion behavior and adhesion mechanism in high speed milling honeycomb alumi-num alloy by experiment.Results show that the initial aluminum scraps adhesion make the tool surface approximation for the same metal with the workpiece,making aluminum scraps adhesion on tool surface intensified.Because of the high tem-perature and high pressure in high speed machining,deformation appear on the adhesive layer.Meanwhile,the initial ad-hesive layer is scratched by subsequent chip,the adhesion layer deformed and further aggravate friction happened between the tool and the chip or workpiece.Additionally,high plasticity characteristic is another important mechanism in the forma-tion of adhesive wear in high speed machining aluminum alloy.Meanwhile,the superficial area of the chip increase caused by severe shear deformation,which rupture the initial stages of cutting metal surface,new surface is cut in close contact with the tool surface near to vacuum conditions,and the atoms on the new surface layer outside keep an unsaturated bond stress state,the surface is quite lively,friction wear surface produced.When the friction chemical reaction reached a cer-tain critical value,tool adhesion wear appear.