共查询到18条相似文献,搜索用时 109 毫秒
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新型双自转研磨法性能分析 总被引:1,自引:1,他引:0
V形槽、双V形槽、偏心盘研磨方式仍是生产球的主要研磨方式,但是它们受到人为因素的影响,一致性和稳定性较差,加工成本高,难以获得高球度的硬质材料球,使硬质材料球的应用仍受到限制,为此针对现有方法提出一种改进方法:新型双自转研磨方式。从研磨过程中球坯的位移、速度和角速度的分析并对现有方法的比较后,得出该方法可大幅度提高球坯的研磨精度和稳定性。图16参10 相似文献
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振动信号是反映精密球体研磨状态的重要途径。利用加速度计传感器、数据采集卡和LabVIEW,设计了一套基于虚拟仪器的振动信号检测设备,对精密球在研磨加工过程中的振动信号进行了测试,从时域、频域等多个角度进行了分析论证。分析表明:精密球体研磨加工的振动信号能有效地监控整个研磨过程,能实时地反映球体研磨的状态和精度。图9参10 相似文献
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圆柱滚子是轴承的重要组件,随着对设备仪器性能的要求不断提高,对圆柱滚子的精度和一致性要求也越来越高。文章分析行星式双平面研磨方式下磨料粒度、研磨盘转速、夹具孔偏角对圆柱滚子的加工精度的影响情况。文中首先基于正交实验设计了标准的L9(34)正交表,并严格按照正交表中的实验序号进行了圆柱滚子的加工实验,然后采用信噪比和ANOVA方差法对加工结果进行数据分析,最终获得了参数的最优组合。根据优化的研磨条件进行加工,结果显示圆柱滚子的圆度、直线度以及平行度均达到了1μm以下,优化效果显著。 相似文献
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本文论述了利用可调转速传动调节磨盘转速对TMP和CTMP盘磨能耗和纸浆质量的影响。研究表明,随着磨盘转速的提高,单位磨浆总能耗和单位磨浆净能耗相应减少,而磨后浆的质量保持稳定 相似文献
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为了获取高质量的超精密球体对四轴球体研磨机进行了改进。由于金属波纹管联轴器兼有传递运动、施加压力和导向功能,在机器的浮动轴结构中采用了这种联轴器。在研磨轴布置了压力传感器获取轴向压力信号,实现各轴压力的实时监测与控制。改进后可以使球体工件更好地对准理想中心,有效地减小了形状误差,而分级控制策略提高了自动化加工效率。磨削实验表明加工球体的表面质量得到较大提高。 相似文献
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三七球磨法超微粉碎运动仿真研究 总被引:1,自引:0,他引:1
采用PFC3D软件建立球磨介质运动的三维离散元数值模型,赋予不同的边界条件,对三七球磨的运动过程进行仿真,分析磨球的运动情况和球体之间的平均接触力,研究不同的球磨因素对三七球磨法超微粉碎效果的影响,并通过单因素试验研究验证仿真结果。结果表明,影响三七球磨粉碎的关键因素依次为转速球料比中小球比,对应的最佳水平为:转速500r/min,球料比81,中小球比14,为三七球磨法超微粉碎回归正交试验设计给出了因素水平参考范围,提供了一种新思路。 相似文献
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Poly(vinyl chloride) (PVC) was ground in air with CaO in the presence of quartz powder as a grinding aid by a small-scale planetary ball mill to investigate the relation of the dechlorination rate of PVC with the impact energy of the balls calculated from a computer simulation based on the Discrete Element Method under various conditions. Mechanochemical dechlorination proceeds as the grinding progresses and is improved with an increase in both the mill speed and the amount of balls introduced into the mill. The same trend can be seen in the relation between the specific normal impact energy of the balls and the rotational speed. The relationship between the observed dechlorination rate and the computed normal impact energy of the balls is linear, with a correlation coefficient of 0.965. This relationship can be used to estimate the dechlorination rate of PVC in a large-scale planetary ball mill. 相似文献
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SARID M. SHEFET BRIAN W. SHELDON BRIAN E. FARKAS KENNETH R. SWARTZEL 《Journal of food process engineering》1999,22(2):141-160
The objectives of this study were to develop a quantitative visualization tool for evaluating flow behavior of particles in a compartmented aseptic system or other flow systems. The three dimensional movement of polystyrene balls as influenced by ball diameter (0.95 and 1.90 cm), fluid flow rate (10, 20 and 30 L/min) and conveyor disk design (2 configurations) was recorded in a model heating apparatus and analyzed using motion analysis software. Ball speed and net-to-gross-displacement ratio (NGDR) values were calculated for ball movement in the x;y and x;z planes. As carrier liquid flow rate increased, there was an associated increase in both the mean and standard deviation speed and NGDR values. In general, larger ball sizes yielded lower speed and NGDR values (i.e., less movement). A concave (bowl-like) conveyor disk design as opposed to a 90° flat-edge disk design yielded greater speed and NGDR values when carrier velocity was greater than 20 L/min. Speed and NGDR values having higher standard deviations were interpreted as having more compartmental mixing. Furthermore, speed and NGDR mean and standard deviations were highly correlated. The results of this study demonstrated the potential utility of the flow visualization method for quantitating the flow behavior of particles through tubes. Furthermore, this method should be of value to food process engineers in developing continuous aseptic processes for particulate-containing foods. 相似文献