Effects Of Milling Parameters For Bamboo On Its Milling Qualities And Unit Cutting Work

In this paper,it is the first time that the quality of milling moso bamboo(Phyllostachys pubescens) was studied.The milling surface roughness,advance spilt and unit cutting work for moso bamboo were influenced by milling parameters,including the tool rake angle,milling height,feed engagement(Uz), and cutting directions,e.g.radical direction and tangential direction.Under the milling condition when bamboo was cutting in radical direction and with an initial angle of incidence(ψ₀) of 0°,with the increase of the rake angle of tool,the indexes which describe the surface roughness,e.g.Ra,Rz,and Ry,became high but the changes of the indexes were unobvious.Meanwhile, the curve of the change of Sm was declined.It was no relevant between the height of cutting and the indexes of surface roughness.The experiment also indicated that there was no clear relevance between Uz and the roughness of the moso bamboo surface.But,there was a positive correlation between Uz and the numerical value of Sm.The results of tangential direction cutting of bamboo were stable and they were better than that of radical direction cutting.When the cutting direction was radical withψ₀ of 2°,with the increase of tool rake angle,advance split became severe.There was a positively correlative relation between milling height and the length of advance split.There is a phenomenal severity of advance split in the position of bamboo where vascular bundles are intensive.Besides,there are significant differences both in the length and the width of advance split in the two cutting directions.Under the process of radical-direction milling whenψ₀ was 0°,as the rake of angle increasd,cutting work became lower.There was a negative linear relationship between the milling thickness and cutting work,and the feed engagement and the cutting work as well.During the process of tangential milling,the unit cutting work which produced on the position of moso bamboo called bamboo-yellow was the highest. However,it was the lowest which happened on the position between bamboo-yellow and bamboo-green.