本文選題：拐角銑削　切入點(diǎn)：載荷控制　出處：《機(jī)械工程學(xué)報(bào)》2016年19期

【摘要】：針對(duì)模具型腔拐角銑削過程,提出一種考慮刀具變形及銑削力變化的基于載荷控制的進(jìn)給量?jī)?yōu)化方法。根據(jù)拐角的銑削中刀具與工件接觸情況的不同,將銑削過程分為五個(gè)階段,分別分析拐角銑削時(shí)刀具切削刃真實(shí)運(yùn)動(dòng)軌跡,建立拐角圓弧運(yùn)動(dòng)軌跡下瞬時(shí)切屑厚度模型,提高切屑厚度模型在拐角加工中的預(yù)測(cè)精度。修正銑削力預(yù)測(cè)模型,使其滿足拐角加工過程不同階段的要求。選取刀具變形量為約束條件,計(jì)算不同階段的允許最大載荷,利用二分迭代法得到該載荷下對(duì)應(yīng)的進(jìn)給量值�？紤]到數(shù)控機(jī)床的運(yùn)動(dòng)加速度限制,對(duì)得到的優(yōu)化進(jìn)給量值進(jìn)行二次優(yōu)化,以滿足實(shí)際加工的要求。仿真結(jié)果表明,在進(jìn)給優(yōu)化后的拐角銑削過程中,載荷變化趨于平穩(wěn),加工時(shí)間縮短。進(jìn)行拐角加工驗(yàn)證試驗(yàn),數(shù)值仿真計(jì)算和試驗(yàn)測(cè)量結(jié)果表明,建立的銑削力模型能夠很好地預(yù)測(cè)拐角銑削過程。所建立的優(yōu)化模型為模具型腔的高精、高效加工提供理論支持。
[Abstract]:In view of the process of corner milling of die cavity, a method of feed optimization based on load control considering the change of tool deformation and milling force is proposed.According to the different contact between cutting tool and workpiece in corner milling, the milling process is divided into five stages. The real movement track of cutting edge in corner milling is analyzed, and the instantaneous chip thickness model under corner arc motion trajectory is established.The prediction accuracy of chip thickness model in corner machining is improved.The prediction model of milling force is modified to meet the requirements of different stages of corner machining.The allowable maximum load at different stages is calculated with the tool deformation as the constraint condition and the corresponding feed value under the load is obtained by using the bipartite iteration method.Considering the movement acceleration limitation of NC machine tool, the optimized feed value is re-optimized to meet the requirement of actual machining.The simulation results show that the load variation tends to be stable and the processing time is shortened in the process of corner milling after feed optimization.The results of numerical simulation and experimental measurement show that the established milling force model can predict the process of corner milling well.The optimized model provides theoretical support for high precision and high efficiency machining of die cavity.
【作者單位】： 哈爾濱理工大學(xué)機(jī)械動(dòng)力工程學(xué)院;
【基金】：國家自然科學(xué)基金重點(diǎn)項(xiàng)目資助(51235003)
【分類號(hào)】：TG54
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本文編號(hào)：1726402