大直径细粒度钎焊金刚石砂轮的制备及其磨削性能研究

发布时间：2018-04-01 14:24

本文选题：钎焊金刚石砂轮　切入点：制备装备　出处：《华侨大学》2017年硕士论文

【摘要】：近年来,随着钎焊金刚石工具制备工艺的发展,制备大直径细粒度钎焊金刚石砂轮并将其运用于高效、高精密磨削加硬质合金等硬脆性材料得到广泛的关注。目前,大直径细粒度钎焊金刚石砂轮的制备存在两大瓶颈:砂轮表面磨粒的等高性和分布均匀性。针对以上问题,本文设计了一套制备大直径细粒度钎焊金刚石砂轮的装备,同时通过高速磨削铝硅合金4032和硬质合金YG8对所制的大直径细粒度钎焊金刚石砂轮进行磨削性能研究。围绕上述的研究思路,本文的主要工作和结果归纳如下:(1)涂覆机构由基体旋转机构、涂料机构和刮料机构组成,通过LabVIEW程序实现了各机构有效准确的控制。在砂轮的涂覆过程中,依据砂轮跳动对刮料片进行实时补偿运动控制,砂轮径向跳动为20μm。通过振动方法与砂轮旋转运动相结合将磨粒均匀撒落在砂轮表面上,将泰森多边形法运用于评价砂轮基体表面磨粒的分布均匀性Cv,并探究出最适的撒粉工艺参数。(2)磨削实验结果研究表明,磨削两种材料时,磨削深度Ap对磨削力的影响都是最大。且磨削铝硅合金4032时砂轮线速度Vs对其磨削力的影响较大,主要是因为铝硅合金4032材料以塑性去除为主。磨削铝硅合金4032的磨削力比为2.6,而磨削硬质合金YG8的为4.7。(3)磨削两种材料时,材料主要是以塑性去除为主,工件加工表面呈现明显的耕犁滑擦沟痕。且磨削铝硅合金4032时,材料表面析出的硬质点(Mg2Si)会以挖除、切断、破碎、保持完整等形式存在,工件表面由孔洞、光滑区、划痕和磨屑黏附构成。磨削铝硅合金4032时,工件表面粗糙度Ra在0.1μm~0.7μm;磨削硬质合金YG8时,工件表面粗糙度Ra在0.1μm~0.9μm。(4)通过检测砂轮表面形貌,发现磨削两种材料时,砂轮表面金刚石主要是以完整、破碎、磨平、折断和脱落形式存在。磨削铝硅合金4032时,磨粒折断比例较大,而磨削硬质合金YG8时,磨粒主要以破碎和磨平为主。(5)从实验结果可知,制备的大直径细粒度钎焊金刚石砂轮对铝硅合金4032和硬质合金YG8具有良好的磨削性能。
[Abstract]:In recent years, with the development of brazing diamond tools, the preparation of large diameter and fine grain brazing diamond grinding wheel and its application in high-efficiency, high-precision grinding and cemented carbide materials have received extensive attention.At present, there are two bottlenecks in the preparation of large diameter fine grain brazing diamond grinding wheel: the uniform distribution of abrasive particles on the surface of grinding wheel.In view of the above problems, a set of equipment for preparing large diameter fine grain brazing diamond grinding wheel is designed in this paper.At the same time, the grinding performance of the large diameter fine grain brazed diamond wheel was studied by high speed grinding of Al-Si alloy 4032 and cemented carbide YG8.The main work and results of this paper are summarized as follows: 1) the coating mechanism is composed of matrix rotating mechanism, coating mechanism and scraper mechanism. The effective and accurate control of each mechanism is realized by LabVIEW program.In the coating process of the grinding wheel, according to the runout of the grinding wheel, the motion of the scraper is compensated in real time, and the radial runout of the wheel is 20 渭 m.By combining the vibration method with the rotating motion of the grinding wheel, the abrasive particles are uniformly scattered on the surface of the grinding wheel.Tyson polygon method is applied to evaluate the distribution uniformity of abrasive particles on the surface of grinding wheel, and the experimental results of grinding experiments show that the grinding depth A p has the greatest effect on grinding force when grinding two materials.The linear velocity Vs of grinding wheel has a great influence on the grinding force of Al-Si alloy 4032, mainly because of the plastic removal of Al-Si alloy 4032.The grinding force ratio of Al-Si alloy 4032 is 2.6, while that of YG8 is 4.7.3.When grinding the two materials, the main material is plastic removal, and the workpiece surface has obvious ploughing, sliding and grooving mark.In the grinding of Al-Si alloy 4032, the precipitated hard spot mg _ 2Si) will exist in the form of excavating, cutting, breaking and keeping intact. The surface of the workpiece is made up of holes, smooth regions, scratches and abrasions.When grinding Al-Si alloy 4032, the surface roughness Ra of workpiece is 0. 1 渭 m ~ 0. 7 渭 m, and that of workpiece surface roughness is 0. 1 渭 m ~ 0. 9 渭 m 路m ~ (4) when grinding cemented carbide, the surface roughness of workpiece is 0. 1 渭 m ~ 0. 9 渭 m 路m ~ (4).Grinding, breaking and shedding forms exist.In grinding Al-Si alloy 4032, the ratio of abrasive fracture is larger, while in grinding cemented carbide YG8, the main abrasive particles are broken and flattened.The large diameter fine grain brazing diamond grinding wheel has good grinding performance on Al-Si alloy 4032 and cemented carbide YG8.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG439.1

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