| 摘要: |
| SiCp / Al 复合材料具有优异的物理性能,但颗粒的存在导致其加工困难。 颗粒材料的超硬性和耐磨性、加工
表面的损伤以及刀具的磨损被认为是该类颗粒复合材料加工的主要障碍。 目的 针对 SiCp / AI 复合材料难加工特
性,通过对比常规切削( CC) 与超声椭圆振动切削( UEVC) 来研究其加工机理,分析两种加工方式下颗粒的损伤对
切屑形成以及表面质量的影响。 方法 基于 SiCp / Al 复合材料的实际微观结构建立切削模型,采用有限元仿真的方
法从微观层面展现其切削过程,能够直观呈现两种加工方式下颗粒损伤对切屑形成、刀具磨损以及表面质量的影
响,进而预测复合材料在实际加工过程中可能遇到的问题,提出相应的解决方案。 结果 CC 加工为锯齿状切屑,切
削过程中主要为颗粒对刀具的两体滑动摩擦以及铝基体粘着摩擦,加工中导致的地下损伤严重。 而 UEVC 加工时
切屑易成段分离,切削过程中主要为颗粒对刀具的三体滚动摩擦,切屑根部聚集的颗粒相较 CC 加工过程较少,弱
化了对加工表面的损伤。 在两种加工方式下,加工表面存在以下缺陷:颗粒破碎、颗粒凸起、大空腔、凹坑以及沟槽
等。 结论 总体来说,UEVC 加工有利于断屑,导致的损伤缺陷更少,颗粒破损程度更小,能大幅降低切削力,对改善
SiCp / Al 复合材料加工表面质量有一定效果。 |
| 关键词: SiCp / Al 复合材料 有限元仿真 超声椭圆振动切削 表面质量 |
| DOI： |
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| Simulation Study of Ultrasonic Elliptical Vibration Cutting SiCp / Al Composites |
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WANG Wenhao, WANG Dazhong
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School of Mechanical and Automotive Engineering Shanghai University of Engineering Science Shanghai 201620 China
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| Abstract: |
| SiCp / Al composites have excellent physical properties but it is difficult to process SICP / Al composites due to
the presence of particles. The superhardness and wear resistance of particle materials damage to the machined surface
and tool wear are considered to be main obstacles to the processing of such particle composites. Objective To address the
challenging machinability of SiCp / AI composites the machining mechanism was studied by comparing conventional
cutting CC with ultrasonic elliptical vibration cutting UEVC and the effects of particle damage on chip formation and
surface quality under the two machining methods were analyzed. Methods The cutting model was established based on the
actual microstructure of SiCp / Al composites and the finite element simulation method was used to show the cutting
process from the microscopic level which was able to intuitively show the effects of particle damage on chip formation
tool wear and surface quality under the two machining methods so as to predict the problems that may be encountered in
the actual machining process of composite materials and to propose corresponding solutions. Results CC machining is
serrated chips the cutting process is mainly two-body sliding friction of particles to the tool and adhesion friction of the
aluminum matrix and the underground damage caused by the machining is serious. However during UEVC machining
the chips are easily separated into segments the cutting process is mainly three -body rolling friction of particles to the tool and particles gathered at the root of the chip are less compared with the CC processing weakening the damage to the
machined surface. Under the two machining methods the machined surface has the following defects particle breakage
particle protrusion large cavities pits and grooves. Conclusion Overall UEVC machining is beneficial to chip
breaking resulting in fewer damage defects and smaller particle damage and can significantly reduce cutting force which
has a certain effect on improving the machining surface quality of SiCp / Al composites. |
| Key words: SiCp / Al composites finite element simulation ultrasonic elliptical vibration cutting surface quality |
