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粗粒度人造多晶金刚石用作超精切削加工刀具材料的可能性 总被引:1,自引:2,他引:1
用粗粒度的人造多晶金刚石刀具进行车削试验.从理论和实验两方面对此种刀具切削形成超精密加工表面的机理进行了研究,提出了"微量切削过程中.人造多晶金刚石刀具多点切削、单点成形"的观点。在与天然单晶金刚石刀具的切削试验结果以及天然单晶金刚石刀具超精切削加工生产条件进行对比之后,验证了粗粒度人造多晶金刚石用作超精切削加工刀具材料的可能性。 相似文献
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一、前言金刚石切削加工技术作为超精密加工的重要组成部分,广泛用于有色金属及一些复合材料的加工。但金刚石不能加工黑色金属,原因在于金刚石是碳同素异性体,切削黑色金属时,两种材料的碳原子相互摩擦、渗透,形成很强的粘结力而粘结,最终刀具的粘结区被黑色金属粘附过去,出现点蚀,这种点蚀重复作用,使金刚石刀具产生严重磨损。由于实际应用中的精密零件,黑色金属及其合金材料占多数,一些传统的加工方法成本高,容易出现质量不稳定的现象,形状复杂的零件难以加工,为此,本文采用超声振动切削加工方法,对金刚石精细切削黑色金… 相似文献
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A small, numerically controlled, two-axis diamond lathe for parts up to 100 mm diameter has been assembled from commercially available components in two weeks. The machine has exceeded performance expectations; in a test of its accuracy, 25.4 mm diameter hemispherical aluminium parts were cut to an accuracy of 0.25 μm (size and contour band) with a surface finish of 25–40 nm rms 相似文献
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Ni—Cr合金Ar气保护炉中钎焊金刚石砂轮的研究 总被引:10,自引:0,他引:10
用活性行钎料钎焊单层金刚石砂轮与传统电镀砂轮相比具有磨锋利,寿命长等优异性能。利用Ar气谷护炉中钎焊的方法,用Ni-Cr合金粉末做钎料,迁当控制钎焊温度,保温时间和冷却速度,实现了金融石与钢基体的牢固连接,利用扫描电镜和X射线能谱,结合X射线衍射结构分析,发现在钎焊过程中Ni-Cr合金中的Cr元素分离出在金刚石界面形成富Cr层并与金刚石表面的C元素反应生成Cr3C2和Cr7C3,这是实现合金与金刚石有较高结合强度的主要因素,重负荷磨削实验表明金刚石为正磨损,没有整颗金刚石脱落。 相似文献
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On-machine precision preparation and dressing of ball-headed diamond wheel for the grinding of fused silica 总被引:1,自引:0,他引:1
In the grinding of high quality fused silica parts with complex surface or structure using ball-headed metal bonded diamond wheel with small diameter,the existing dressing methods are not suitable to dress the ball-headed diamond wheel precisely due to that they are either on-line in process dressing which may causes collision problem or without consideration for the effects of the tool setting error and electrode wear.An on-machine precision preparation and dressing method is proposed for ball-headed diamond wheel based on electrical discharge machining.By using this method the cylindrical diamond wheel with small diameter is manufactured to hemispherical-headed form.The obtained ball-headed diamond wheel is dressed after several grinding passes to recover geometrical accuracy and sharpness which is lost due to the wheel wear.A tool setting method based on high precision optical system is presented to reduce the wheel center setting error and dimension error.The effect of electrode tool wear is investigated by electrical dressing experiments,and the electrode tool wear compensation model is established based on the experimental results which show that the value of wear ratio coefficient K’ tends to be constant with the increasing of the feed length of electrode and the mean value of K’ is 0.156.Grinding experiments of fused silica are carried out on a test bench to evaluate the performance of the preparation and dressing method.The experimental results show that the surface roughness of the finished workpiece is 0.03 μm.The effect of the grinding parameter and dressing frequency on the surface roughness is investigated based on the measurement results of the surface roughness.This research provides an on-machine preparation and dressing method for ball-headed metal bonded diamond wheel used in the grinding of fused silica,which provides a solution to the tool setting method and the effect of electrode tool wear. 相似文献
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介绍了精密微成形技术的基本特点,分析总结了微成形技术的主要研究领域、研究现状,阐述了将非晶合金材料应用到微成形领域的优点以及非晶微成形工艺的最新研究进展,并指出了精密微成形技术的发展趋势。 相似文献