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Effect of Machine Stiffness on Cutting Performance

机器刚度对切削性能的影响

基本信息

批准号：
02555132
负责人：
NISHIMATSU Yuichi
金额：
$ 4.99万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555132/
关键词：
Rock Point Attack Bit Machine Stiffness Cutting Force Fracture Mechanics Numerical Simulation 切削剛性

项目摘要

The cutting characteristics of a point attack bit, especially the effects of cutting speed and depth of cut on cutting force were investigated. Point attack bits are becoming more popular as a cutting tool for boomheader, but its performances are still open to discussion. A series of rock cutting experiments were conducted with various cutting depths and speeds.It was found that the horizontal component of cutting force increases linearly with cutting depth. This simple relation is true all for the mean, the mean peak and the peak values. It was also found that the build-up nose develops on the clearance face of the bit when a hard andesite is cut at higher cutting speed. As a result, cutting force, especially its vertical component, increases considerably with cutting speed.The effects of cutting machine stiffness are discussed. Machine stiffness is regarded as one of the important factors in rock cutting, but its effects on cutting performance have scarcely been studied. In this study, a test rig with variable stiffness was designed and manufactured with which a series of cutting experiments were performed.It was iound that the horizontal-vertical (cross) component of compliance matrix has significant importance. If it is negative, the vertical component of cutting force increases and decreases harmonically with the horizontal component during a cutting process. If positive, however, the vertical component increases when the horizontal component decreases, and vice versa. It was also found that machine stiffness has effects on the mean, the mean peak and the maximum values of cutting force. The mean peak and the maximum values increase with stiffness against the force parallel to the bit axis, that is, stiffness corresponding to the sum of the cross and the vertical components of stiffness.

研究了尖击钻头的切削特性，特别是切削速度和切削深度对切削力的影响。点攻击钻头作为悬臂式掘进机的切削工具越来越受欢迎，但其性能仍有待讨论。在不同切削深度和切削速度下进行了一系列岩石切削试验，发现切削力的水平分量随切削深度的增加而线性增加。这个简单的关系对于平均值、平均峰值和峰值都是正确的。还发现，当以较高的切削速度切削硬安山岩时，在钻头的间隙面上形成堆积鼻。结果表明，切削力，尤其是切削力的垂直分量，随切削速度的增加而显著增加。机床刚度是影响岩石切削性能的重要因素之一，但其对切削性能的影响研究较少。本文设计并制作了变刚度试验台，进行了一系列的切削试验，发现柔度矩阵的水平-垂直（交叉）分量具有重要意义。如果它是负的，则在切削过程中，切削力的垂直分量与水平分量和谐地增加和减少。然而，如果是正的，则垂直分量在水平分量减小时增大，反之亦然。机床刚度对切削力的平均值、平均峰值和最大值都有影响。平均峰值和最大值随着抵抗平行于钻头轴线的力的刚度而增加，即，刚度对应于刚度的横向和垂直分量的总和。