摘要
在建立串珠绳锯切弧区内单颗磨粒平均切削深度与锯切参数间理论关系的基础上,采用单因素和正交法进行锯切参数对锯切力和锯切能耗影响的试验研究。结果表明,单颗磨粒平均切削深度与锯切长度无关,但随进给率的增大或线速度的减小而增大。进给率对锯切力和功率的影响比线速度和锯切长度都要明显。锯切过程中材料去除方式存在体积破碎,适当增大磨粒切削深度有利于提高体积破碎比例从而降低锯切比能;但增大磨粒切削深度直接缩小了介于工具—工件接触面间的动态容屑空间从而加剧岩屑摩阻效应,长弧区排屑困难对锯切力和能耗影响明显。正确选择锯切工艺参数尤其是进给率,对锯切力和能耗的控制及动态容屑空间的平衡至关重要。
An investigation is reported of the influences of sawing parameters on the sawing forces and energy consumption in wire sawing of granite. The relationships between sawing parameters and the average cutting depth of grit （hay） are established. The sawing experiment is conducted on a mini-type wire saw machine and the combinations of sawing parameters are designed by using the one-factor and the orthogonal method. The results show that hay is irrelative to sawing length but increases with the increase in wire feeding speed or decrease in wire peripheral speed. In wire sawing of granite, the influence of wire feeding speed on the sawing forces and sawing power is more significant than that of sawing length or peripheral speed. The granite can be machined by the deformation mode of volume break and properly increasing grit cutting depth is helpful to lowering specific energy consumption. However, the increase of grit cutting depth will reduce the dynamic chip accommodation space between the tool and workpiece, and result in the increase of sawing forces and energy computation due to the chip friction especially in the long sawing length. To control the sawing forces and power, and the dynamic chip accommodation space, the sawing parameters, in particular wire feeding speed, should be properly selected.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第3期234-239,共6页
Journal of Mechanical Engineering
基金
教育部新世纪优秀人才计划(NCET-04-0610)
国家自然科学基金(50305006)
福建省自然科学基金(E0810020)资助项目
关键词
串珠绳锯
锯切力
锯切功率
比能
磨粒切削深度
Diamond wire saw Sawing forces Sawing power Specific energy Cutting depth of grit
