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中文字数:2836,中文页数:3 英文字数:1673页数:3
一、导言
动态材料模型（数字万用表）方法已广泛用于宏观，变形，加工条件下材料的热变形。研究目的是提出一种新的方法，优化了热加工材料使用的标准数字万用表的稳定。组建流动行为的Al - 20厘碳化硅在温度范围50--350 ℃和切割速度范围25—300米/分钟已被赋值，以便优化其加工利用数字万用表的不稳定参数。不稳定的数字万用表参数估计适合最佳域为狭窄地区约150 C和150米/分钟加工的加工材料。据观察，这是该刀具磨损最低的最佳条件。这一调查证明，加工可以优化通过数字万用表。
铝基复合材料的研究发现增加不同类型的金属基复合材料（复合材料）的应用 。他们正在考虑作一种材料用在缸体衬里，汽车驱动轴，汽车活塞，自行车框架。 加工是三菱材料工业生产部件的一个共同遵循的做法的。在场的情况下加强粒子在MMC中导致刀具迅速磨损过程的传统加工方法。低切速度正在遭受因磨损率高的高度加工成本的结果。因此，有必要提高这些材料的加工性能。 提高加工性能应能够增加材料去除率，长期刀具寿命，并改善表面光洁度。加工时加高温一直被视为实现这些目标的一个可行的办法。据实验统计表明，加热工件可以延长刀具寿命并提高粗糙度加工表面。Vedani和Garibold报告说，在温度超过300 摄氏度时 ，铝碳化硅复合材料展开将大大减少流动应力。 虽然前面的研究不一定在最佳条件下完成，并显示在改进加工的报告上。如果参数，如温度，切削深度，以及切削速度优化，改进加工潜在的能力是可以实现的。
I.INTRODUCTION
The dynamic material model (DMM) method has been widely used for the macroscopic description of flow, fracture, and workability of materials under hot deformation. This inves-tigation is aimed at proposing a new methodology for the optimization of hot machinability of a material using the DMM stability criteria. The constitutive ?ow behavior of Al-20 pct SiC has been evaluated in the temperature range 50 C to 350 C and the cutting velocity in the range from 25 and 300 m/min with the view to optimizing its machinability using the DMM instability parameters. The DMM instability parameters predicted a narrow region around 150 C and 150 m/min as the optimum domain for machining this material. It has been observed that the tool wear is minimum at optimal conditions. This investigation proved that the machinability could be optimized through the DMM.
THE aluminum-based composites are finding increased applications among the various types of metal matrix composites (MMCs). They are being considered as a material for cylinder block liners, vehicle drive shafts, pistons in automobiles, and bicycle frames. Machining is one of the common practices followed in industries for the production of components made of MMC material. The presence of reinforcement particles in the MMC leads to rapid wear of cutting tools during machining by conventional methods. Low cutting speeds are being adopted due to high wear rate results in a high machining cost. Therefore, there is a need to enhance the machining performance for these materials. The enhancement of machining performance should lead to an increased material removal rate, prolonged tool life, and improved surface finish. Machining at elevated temperatures has been considered as a viable approach to achieve these goals. It has been experimentally demonstrated that heating the workpiece can extend the tool life and also improve the roughness of the machined surfaces. Vedani and Garibold reported that at temperatures above 300 C, Al-SiC composites exhibit significantly reduced flow stress. Although the preceding studies have not necessarily been performed under optimal conditions, significant improvement of machinability has been reported. If the parameters such as temperature, depth of cut, and cutting speed are optimized, improvements in machinability can be potentially achievable.
