摘要:
为合理制定竹材切削工艺,节约切削动力,该文利用传感器技术及信号分析技术,经切削实验研究了毛竹不同切面、密度、含水率等物理性质及刀具前角、切削量与切削速度等切削参数对切削力的影响.结果表明,由于竹黄部位维管束分布较疏,所需主切削力较小;竹青部位维管束分布密集,主切削力较大.端面切削主切削力最大,纵向切削力次之,横向切削力最小;竹材密度对切削力有明显影响,且呈正相关关系.随着含水率的增大,竹材韧性增加,所需主切削力增加;当含水率超过30%之后,主切削力随含水率的进一步增加而缓慢降低.刀具前角对主切削力的影响较为显著,随刀具前角的增大,所需主切削力明显减小.主切削力与切削量呈正相关关系.切削速度对切削力的影响不大.
关键词:
-
毛竹
/
-
物理特性
/
-
切削参数
/
-
切削力
Abstract:
The effects of physical characteristics of moso bamboo(Phyllostachys pubescens), such as section, density and moisture content, and the cutting parameters including cutting thickness, rake angle, cutting speed on the cutting forces were studied with the aid of transducer technology and signal analysis. It was found that because vascular bundles were dense near the out culm wall and thin on the inside,more force was needed to cut the outer part of bamboo than to cut the inner part. Different forces were required to cut the various sections: the largest force was needed to cut the end section and the smallest force was spent on cross cutting. Density has an obvious effect: the denser the bamboo is, the larger the cutting force required. Toughness of bamboo is enhanced with an increase in moisture content of bamboo and a larger force is needed for cutting. However, when moisture content exceeds 30%, the required cutting force declines. Rake angle of the tool has a significant effect on the parallel tool force. The parallel tool force required decreases with an increase of the rake angle and is positively correlated with cutting thickness. The effect of cutting speed on the cutting force is not significant.
下载:
