现代制造工程
現代製造工程
현대제조공정
MODERN MANUFACTURING ENGINEERING
2015年
4期
53-56
,共4页
螺纹连接%弹塑性接触%液压机机架%优化设计%有限元分析
螺紋連接%彈塑性接觸%液壓機機架%優化設計%有限元分析
라문련접%탄소성접촉%액압궤궤가%우화설계%유한원분석
thread connection%elastic-plastic contact%press frame%optimized design%Finite Elements Analysis ( FEA)
针对液压机预应力机架拉杆螺纹第一承载牙根部出现了早期裂纹并发生断裂的问题，运用弹塑性接触有限元方法和Python语言，对拉杆连接螺纹进行参数化建模和分析，研究标准锯齿形螺纹的螺距和旋合圈数对牙根部最大等效应力以及牙间载荷分布的影响，并进行优化设计，得到不同螺距下的最优旋合圈数。结果表明，合理的螺距和旋合圈数能够有效地改善螺纹连接应力及载荷分布，进而提高螺纹的疲劳寿命，为大型压机螺纹连接结构设计提供理论参考。
針對液壓機預應力機架拉桿螺紋第一承載牙根部齣現瞭早期裂紋併髮生斷裂的問題，運用彈塑性接觸有限元方法和Python語言，對拉桿連接螺紋進行參數化建模和分析，研究標準鋸齒形螺紋的螺距和鏇閤圈數對牙根部最大等效應力以及牙間載荷分佈的影響，併進行優化設計，得到不同螺距下的最優鏇閤圈數。結果錶明，閤理的螺距和鏇閤圈數能夠有效地改善螺紋連接應力及載荷分佈，進而提高螺紋的疲勞壽命，為大型壓機螺紋連接結構設計提供理論參攷。
침대액압궤예응력궤가랍간라문제일승재아근부출현료조기렬문병발생단렬적문제，운용탄소성접촉유한원방법화Python어언，대랍간련접라문진행삼수화건모화분석，연구표준거치형라문적라거화선합권수대아근부최대등효응력이급아간재하분포적영향，병진행우화설계，득도불동라거하적최우선합권수。결과표명，합리적라거화선합권수능구유효지개선라문련접응력급재하분포，진이제고라문적피로수명，위대형압궤라문련접결구설계제공이론삼고。
The first tooth-root portion of the rod thread in a hydraulic press pre-stressed frame appeared early crack and tended to fatigue fracture.To solve this problem,a parameterized model of the thread connection was setup with Python and solved by the e -lastic-plastic contact finite element method .The effects of the different pitches and the number of turns for the standard buttress thread form on the peak of equivalent stress and axial load distribution was simulated and studied also .After that,the optimal turning-numbers for different screw pitches was obtained .The results indicate that a reasonable pitch and turning-numbers can ef-fectively reduce the maximum stress and homogenize the load distribution between the teeth .Therefore the fatigue life of the thread connection can be improved .The research findings can provide a useful theoretical guidance for the design of the thread connection of a large-scale hydraulic press frame .
