钛合金专用树脂CBN磨具的制备与磨削性能的研究

发布时间：2018-04-17 09:25

本文选题：树脂CBN磨具 + 钛合金磨削　；参考：《河南工业大学》2017年硕士论文

【摘要】：钛合金是一种典型的难磨金属材料。砂轮粘附严重、磨削温度较高,是钛合金磨削加工亟待解决的两个问题。树脂CBN磨具由于CBN磨料硬度高、强度大、稳定性好,结合剂强度和硬度可调范围较广,适合应用于钛合金材料的精磨加工。本文将开展钛合金专用树脂CBN磨具的制备及钛合金磨削加工的研究,以寻求润滑性能好、导热散热吸热效果良好的磨削加工工具,改善磨削过程中的磨具粘附、工件烧伤的问题,并用热分析及电镜等手段进行了结构表征。本文以树脂CBN磨具配方为基础,研究了其混料工艺、装模工艺、热压工艺以及固化工艺,确定了制备树脂CBN磨具的最佳工艺流程。以固体润滑剂和热吸收剂为研究对象,选用固体润滑剂:石墨、HBN、PTFE,热吸收剂:硬脂酸钡、铝镁水滑石,分别添加不同含量到树脂CBN磨具中,对磨具进行力学性能分析以及磨削性能研究。同时以水和煤油为磨削液,分别对添加HBN的树脂CBN磨具以及添加PTFE的树脂CBN磨具进行磨削性能考察。研究结果表明:以石墨为润滑剂的配方,石墨添加量为8g的磨具磨削比为3.80,摩擦力为35.70N,摩擦系数为0.27,具有最高的磨削比,摩擦力和摩擦系数最小,能够平稳顺利的进行磨削,磨具无粘附,工件未烧伤。以HBN为润滑剂的配方,HBN添加量为8g的磨具磨削比为3.64,摩擦力为29.86N,摩擦系数为0.22,具有最高的磨削比,摩擦系数和摩擦力最小,磨削过程平稳顺利,磨具无粘附,工件未烧伤。以PTFE为润滑剂的配方中,PTFE添加量为4g时的磨具磨削比为3.51,摩擦力为31.69N,摩擦系数为0.23,具有最高的磨削比,磨削过程平稳顺利,磨具无粘附,工件未烧伤,工件去除率最高。对比三个系列润滑剂配方的磨削性能,PTFE系列磨具的润滑效果最好,HBN次之。以硬脂酸钡为热吸收剂的磨具的硬度和强度会大幅下降,影响磨具的正常使用。以铝镁水滑石为热吸收剂的配方,水滑石添加量为6g的磨具磨削比为4.00,摩擦力为41.64N,摩擦系数为0.31,具有最高的磨削比,磨削过程平稳顺利,磨削过程发热不明显,磨具无粘附,工件未烧伤。以HBN为润滑剂的磨具,使用水作为磨削液磨削TC4钛合金,其磨削比要比使用煤油作为磨削液的磨削比要高。以PTFE为润滑剂的磨具,使用煤油作为磨削液磨削TC4钛合金,其磨削比要比使用水作为磨削液的磨削比要高。PTFE系列磨具在以煤油为磨削液磨削TC4钛合金,工件磨削面光洁度最佳。
[Abstract]:Titanium alloy is a typical refractory metal material.Grinding wheel adhesion and high grinding temperature are two urgent problems to be solved in titanium alloy grinding.Due to the high hardness, high strength and good stability of the CBN abrasive, the resin CBN abrasive has a wide range of adjustable strength and hardness, so it is suitable for the precision grinding of titanium alloy materials.In this paper, the preparation of special resin CBN grinding tool for titanium alloy and the grinding process of titanium alloy will be studied in order to find the grinding tool with good lubricity and good heat transfer and heat absorption effect, and to improve the adhesion of grinding tool in grinding process.The problem of workpiece burn was characterized by thermal analysis and electron microscope.Based on the formula of resin CBN abrasives, the mixing process, molding process, hot pressing process and curing process were studied, and the optimum technological process of preparing resin CBN abrasive tools was determined.Taking solid lubricant and heat absorbent as the research object, solid lubricant: graphite HBN (PTFEE), thermal absorbent: barium stearate, aluminum magnesium hydrotalcite were added to resin CBN abrasives with different contents, respectively.The mechanical properties and grinding properties of abrasive tools are analyzed.At the same time, the grinding performance of resin CBN abrasives with HBN and resin CBN abrasives with PTFE were investigated with water and kerosene as grinding fluid.The results show that with graphite as lubricant, the grinding ratio of grinding tool with 8 g graphite is 3.80, the friction force is 35.70 N, the friction coefficient is 0.27, and the grinding ratio is the highest, the friction force and friction coefficient are minimum, and the grinding can be carried out smoothly and smoothly.There is no adhesion to the abrasive and the workpiece is not burned.The grinding ratio, friction force and friction coefficient of grinding tool with 8 g additive of HBN as lubricant are 3.64, 29.86Nand 0.22 respectively. It has the highest grinding ratio, minimum friction coefficient and friction force, smooth grinding process, no adhesion of grinding tool and no burn of workpiece.In the formula with PTFE as lubricant, the grinding ratio is 3.51, the friction force is 31.69 N, the friction coefficient is 0.23, the grinding process is smooth, the grinding tool is not adhered, the workpiece is not burned, and the removal rate of the workpiece is the highest.Compared with the grinding performance of three series lubricant formulations, the lubricating effect of PTFE series abrasive tools is better than that of HBN.The hardness and strength of abrasives with barium stearate as heat absorbent will be decreased greatly, which will affect the normal use of abrasive tools.With aluminum-magnesium hydrotalcite as heat absorbent, the grinding ratio of grinding tool with 6 g of hydrotalcite is 4.00, the friction force is 41.64N, the friction coefficient is 0.31, the grinding process is smooth and smooth, the heat of grinding process is not obvious, and the grinding tool has no adhesion.The workpiece is not burned.The grinding ratio of TC4 titanium alloy grinding with HBN as lubricant and water as grinding fluid is higher than that with kerosene as grinding fluid.The grinding ratio of TC4 titanium alloy grinding with PTFE as lubricant and kerosene as grinding fluid is higher than that with water. The grinding surface finish of workpiece is the best when kerosene is used as grinding fluid.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG580.6

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