3D laser investigation on micron-scale grain protrusion topography of truncated diamond grinding wheel for precision grinding performance
3D laser investigation on micron-scale grain protrusion topography of truncated diamond grinding wheel for precision grinding performance
复制标题
3D 激光研究截断金刚石砂轮微米级晶粒突起形貌的精密磨削性能
DOI：
10.1016/j.ijmachtools.2011.01.010
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发表时间：
2011-05-01
影响因子：
14
通讯作者：
Kubo, A.
中科院分区：
文献类型：
--
作者：
Xie, J.;Wei, F.;Kubo, A.
针对270号金刚石砂轮切入磨削硬脆材料时的磨粒突尖，提出了一种磨粒突尖截短方法。在这项研究中，采用3D激光显微镜来测量车轮工作表面并参数化其3D颗粒突起地形。目的是研究微米级的颗粒突起参数如何影响磨削性能，如磨削力和表面粗糙度。在石英玻璃磨削实验中，首先对金刚石砂轮修整后进行GT截断，然后通过平滑三维测量噪声、匹配测量点云、转移突起框、提取三维金刚石颗粒等步骤，构建其三维颗粒突起形貌;最后，通过对磨粒凸出数、磨粒凸出高度、磨粒凸出体积、磨粒前角磨粒间隙角等与磨削表面和磨削力的关系进行了研究。结果表明，GT截齿使整个砂轮表面的磨粒突出数、突出高度、突出体积、前角和后角分别平均减少44%、74%、75%、24%和70%。但在实际磨削中，当切削深度为1 μ m时，有效磨粒数增加约32倍，有效磨粒体积增加约181倍，从而使表面粗糙度降低约80%，磨削力增加约40倍。研究还发现，截头金刚石磨粒尖端大多沿着磨粒切割方向形成纳米级尖端楔形，导致约75%的磨粒负前角和约75%的磨粒大间隙角，从而有助于韧性模式研磨。确定了实际切深下的有效磨粒数和有效磨粒体积可作为评价和预测粗金刚石砂轮精密磨削性能的主要磨粒凸出量参数。(C)2011爱思唯尔有限公司保留所有权利。
A grain tip (GT) truncation is proposed to truncate grain protrusion tips of #270 diamond grinding wheel in Plunge grinding of hard and brittle material. In this study, a 3D laser microscopy was employed to measure the wheel working surface and parameterize its 3D grain protrusion topography. The objective is to investigate how micron-scale grain protrusion parameters influence grinding performance such as grinding force and surface roughness. First, the GT truncation was performed after dressing of diamond grinding wheel in grinding experiment of quartz glass; then its 3D grain protrusion topography was constructed by smoothing 3D measured noise, matching measured point cloud, transferring protrusion frame and extracting 3D diamond grains; finally, the grain protrusion parameters such as grain protrusion number, grain protrusion height, grain protrusion volume, grain rake angle, grain clearance angle, etc. were investigated in connection with ground surface and grinding force. It is shown that GT truncation averagely decreases grain protrusion number, grain protrusion height, grain protrusion volume, grain rake angle and grain clearance angle by about 44%, 74%, 75%, 24% and 70% on whole wheel surface, respectively. However, it greatly increases active grain number by about 32 times and active grain volume by about 181 times in actual grinding with the depth of cut in 1 mu m, thus leading to a decrease (about 80%) in surface roughness and an increase (about 40 times) in grinding force. It is also found that truncated diamond grain tips are mostly shaped with nanometer-scale tip wedges along grain cutting direction, leading to about 75% very large negative grain rake angles and about 75% large grain clearance angles, thus contributing to ductile-mode grinding. It is confirmed that the active grain number and active grain volume for the actual depth of cut may be regarded as main grain protrusion parameters to evaluate and predict the precision grinding performance of a coarser diamond grinding wheel. (C) 2011 Elsevier Ltd. All rights reserved.