关键词: 刀具偏心跳动, 瞬时铣削力模型, 瞬时切削面积, 铣削力作用点, 硬脆材料

Abstract:

Taking side milling machinable microcrystalline ceramics as object， an instantaneous overall milling force model was built. The instantaneous milling force of end milling cutter side edge milling was studied under the condition of tool eccentricity and runout. The instantaneous cutting thickness and area were obtained through the hypocycloidal motion between the milling tool and the workpiece. The optimal solution for tool eccentricity and eccentricity angle was determined through linear search method. The precise solution of the instantaneous milling force action point was obtained using a one-dimensional search algorithm and expressed as the instantaneous rotation angle under the condition of tool eccentricity and jumping. A new instantaneous milling force model was established based on the Martellotti model. The instantaneous milling force model coefficients were identified using the least squares method. And from the perspective of the milling force action point （instantaneous rotation angle）， the variation characteristics of instantaneous milling force were studied. The validation results of milling experiments indicate that the predicted values of the milling force model are in good agreement with the experimental values， with an average relative error not exceeding 8%. Therefore， the instantaneous milling force model demonstrates high prediction accuracy.

Key words: tool eccentricity and runout, instantaneous milling force model, instantaneous cutting area, action point of milling force, hard and brittle materials