木材年轮对切削力和切屑变形的影响  

Cutting forces and Cutting Chip Formation affected by Wood Annual Ring

作　　者：曹平祥[1] ROLF BIRKELAND 

机构地区：[1]南京林业大学 [2]挪威农业大学

出　　处：《木材加工机械》1999年第2期19-22,共4页Wood Processing Machinery

摘　　要：在纵向（９０－０）木材切削过程中，经常会遇到两种不同的切削情况：径向切削和弦向切削。本文主要研究两种切削情况的切削力和切屑变形的差异。所选用的试材为挪威常用的５种木材：松木，云杉，桦木，杨木和栎木。试验表明，两种情况下的切屑变形和破坏程度及切削力存在差异。径向切削情况下的切削力波动较大，切屑破坏较大。切削力的峰值随着切削厚度增加而增大，但栎木增大幅度大于其它４种试材。Abstract Two different situations are usually encountered when cutting wood parallel to the grains(90-0).The study was to investigate chip formation and cutting forces of five common wood species (pine,spruce,birch,aspen and oak) in Norway when maching wood in the 90-0 situation with the cutting edge both in the radial and tangential situations relative to the annual rings.The radial of the spiral chips and chip failures are a little different in both cutting situations.The maximum parallel forces in the radial situation were larger than the ones in the tangential situation;and increased as cutting thickness increased.The parallel forces of the five wood species,especially oak,undulated more in the radial situation than in the tangential situation.

关 键 词：径向切削力 切屑变形 切削厚度 切屑形成 木材切削 切削形式 切削层 轮对 含水率 螺旋状 

分 类 号：S781.2[农业科学—木材科学与技术]