Experiments of ultra-precision turning of SiCp/Al composites

GE Ying-fei; XU Jiu-hua; YANG Hui

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Experiments of ultra-precision turning of SiC_p/Al composites

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- Experiments of ultra-precision turning of SiC_p/Al composites
- Optics and Precision Engineering Vol. 17, Issue 7, Pages: 1621-1629(2009)
- 作者机构：
  
  1. 南京航空航天大学机电学院,江苏南京,210016
  2. 南京工程学院机械系,江苏南京,211167
  3. 北京航空精密机械研究所北京,100076
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB33;TG506.2
- Received：05 August 2008，
  
  Revised：24 September 2008，
  
  Published Online：25 July 2009，
  
  Published：25 July 2009
- 稿件说明：
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葛英飞, 徐九华, 杨辉. SiCp/Al复合材料的超精密车削试验[J]. 光学精密工程, 2009,17(7): 1621-1629

GE Ying-fei, XU Jiu-hua, YANG Hui. Experiments of ultra-precision turning of SiCp/Al composites[J]. Editorial Office of Optics and Precision Engineering, 2009,17(7): 1621-1629
葛英飞, 徐九华, 杨辉. SiCp/Al复合材料的超精密车削试验[J]. 光学精密工程, 2009,17(7): 1621-1629 DOI：

GE Ying-fei, XU Jiu-hua, YANG Hui. Experiments of ultra-precision turning of SiCp/Al composites[J]. Editorial Office of Optics and Precision Engineering, 2009,17(7): 1621-1629 DOI：

摘要

试验研究了碳化硅颗粒增强铝基复合材料(SiC

/Al)的超精密车削加工性能。使用扫描电镜(SEM)对已加工表面、切屑及其根部、刀具前/后刀面磨损带进行观察

使用表面粗糙度轮廓仪对各种切削条件下的加工表面粗糙度轮廓进行测试分析。结果表明

该材料的加工表面常残留微孔洞、微裂纹、坑洞、划痕、残留物突起及基体材料撕裂等微观缺陷

刀具几何参数、切削速度、进给量、增强颗粒尺寸和材料体积分数是影响表面粗糙度的主要因素。由于切削变形区微裂纹动态形成的作用

超精密切削该材料时一般形成锯齿型切屑。刀具-工件的相对振动、基体撕裂增强颗粒拔出、破碎、压入等是该材料超精密车削表面形成的主要机制。单晶金刚石(SCD)刀具主要发生微磨损、崩刃、剥落和磨粒磨损

聚晶金刚石(PCD)刀具主要发生磨粒磨损和粘结磨损。结论表明SiC

/Al的超精密切削加工性较差

但通过选择合适的工艺参数

体积分数为15%的SiC

/2024Al加工表面粗糙度

可达24.7 nm。

Abstract

The ultra-precision machinability of SiC

/Al composites is investigated experimentally. A scanning electron microscope (SEM) is used to examine the machined surfaces

chips

chip roots and tool wear lands

and a surface profiling instrument is taken to measure the surface profile roughnesses in different turning conditions. The results show that the machined surface remains a lot of defects such as pits

voids

microcracks

grooves

protuberances

matrix tearing

etc

. The tool geometries

cutting speeds

feed rates

particle reinforcement sizes and the volume fractions are the significant influence factors of surface roughness. Generally

a segmental chip is formed in turning composites due to the effect of dynamic microcrack behavior. The tool-workpiece relative vibration and the removal modes of SiC particles are the main mechanisms of surface generation. The microwear

chipping

peeling and the abrasive wear are the main wear patterns by using the Single Crystal Diamond (SCD) tool

while Polycrystalline Diamond (PCD) tool mainly suffers from the abrasive wear on the rake face and the adhesive wear on the flank face. The experimental result indicates that the SiC

/Al composites has a relatively bad machinability. However

when the cutting parameters are rationally chosen

a surface roughness

of 24.7 nm can be obtained for SiC

/2024Al(in a volume fraction of 15%).

关键词

Keywords

references

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