共查询到20条相似文献,搜索用时 375 毫秒
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The surface mechanical attrition treatment (SMAT) technique was developed to synthesize a nanocrystalline (NC)layer on the surface of metallic materials for upgrading their overall properties and performance. In this paper, by means of SMAT to a pure zirconium plate at the room temperature, repetitive multidirectional peening of steel shots (composition (wt%): 1C, 1.5Cr, base Fe) severely deformed the surface layer. A NC surface layer consisting of the intermetallic compound FeCr was fabricated on the surface of the zirconium. The microstructure characterization of the surface layer was performed by using X-ray diffraction analysis, optical microscopy, scanning and transmission electron microscopy observations. The NC surface layer was about 25 μm thick and consisted of the intermetallic compound FeCr with an average grain size of 25+10 nm. The deformation-induced fast diffusion of Fe and Cr from the steel shots into Zr occurred during SMAT, leading to the formation of intermetallic compound. In addition, the NC surface layer exhibited an ultrahigh nanohardness of 10.2 GPa. 相似文献
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Spiral cutting operation strategy for machining of sculptured surfaces by conformal map approach 总被引:7,自引:0,他引:7
Yu-Wen Sun Dong-Ming Guo Zhen-Yuan Jia 《Journal of Materials Processing Technology》2006,180(1-3):74-82
Although compound surfaces and polyhedral models are widely used in manufacturing industry, the tool path planning strategies are very limited for such surfaces in five-axis machining and high speed machining. In this paper, a novel conformal map based and planar spiral guided spiral tool path generation method is described for NC machining of complex surfaces. The method uses conformal map to establish a relationship between 3D physical surface and planar circular region. This enables NC operation to be performed as if the surface is plat. Then through inversely mapping a planar spiral defined by a mathematical function into 3D physical space, the spiral cutter contact paths are derived without inheriting any corners on the boundary in the subsequent interior paths. The main advantage of the proposed method is that a smoother, longer and boundary conformed spiral topography tool path is developed. Therefore, the machined surface can be cut continuously with minimum tool retractions during the cutting operations. And it allows both compound surfaces and triangular surfaces can be machined at high speed. Finally, experimental results are given to testify the proposed approach. 相似文献
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模具型腔在数控加工中需要一套控制刀具运动轨迹的算法,本文给出了从模具型面的几何描述,加工数据的生成到形成G格式指令进行数控加工这一生产过程的数据处理,实验和现场加工的结果表明:该数据处理算法成功地解决了模具型面的加工制造问题。 相似文献
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基于公司的生产实际,结合CAM软件在我公司应用的特点,论述了PowerMILL软件在编程加工方面的优势,并将其成功地应用到汽车模具的层切加工中。同时,通过借助PowerMILL进行数控编程,引进了高效的可转位刀具。提高了大型数控铣床加工效率,缩短模具生产周期,降低制造成本。 相似文献
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模具曲面数控加工刀位轨迹仿真软件开发 总被引:1,自引:0,他引:1
利用VC开发基于数控程序的刀位轨迹仿真软件 ,介绍了刀位轨迹仿真和刀位轨迹显示的原理 ,总结了模具曲面数控加工前进行刀位轨迹仿真的必要性和优越性 相似文献
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C机能二维刀补的计算机图形仿真 总被引:1,自引:0,他引:1
章声 《组合机床与自动化加工技术》2002,(5):38-39,50
提出了一种采用计算机图形仿真来检验数控加工程序中刀具补偿代码正确的方法,利用VC++6.0开发了相应的数控程序仿真软件,并就如何读取数控程序,分析数控代码的问题做了一些探讨。 相似文献
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本文以异型销孔数控镗削系统为例论述了数控加工系统软件中的中断的重要性 ,探讨了在Windows下采用Win Driver工具开发Vxd处理外部中断的技术。并通过实验对在Windows平台进行数控软件的开发的可行性进行了初步的探讨。本文对于今后将软靠模系统控制软件从Dos转到Windows下提供了有意义的尝试。 相似文献