共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
高斯滤波在三维表面评定中的应用 总被引:1,自引:0,他引:1
表面粗糙度是影响物质表面技术性能的重要物理特征之一,随着现在工程表面要求的不断提高,二维评定已不能满足要求.高斯滤波为当今用滤波技术中的主要方法.本文分析了高斯滤波法在评定三维表面信息时的数学模型并给出高斯滤波本身的不足.为克服其缺点,本文引入了稳健高斯滤波原理并给出算法,最终通过实验证明了其有效性. 相似文献
4.
表面综合形貌误差的灰色分离方法 总被引:1,自引:0,他引:1
工件表面综合形貌误差由表面粗糙度、表面波纹度和形状误差等成分组成,各成分对工件的使用性能有着不同程度的影响.各种误差成分的无失真提取是进行表面综合形貌评定的核心和关键.本文将灰色误差理论应用到表面综合形貌评定中,提出了表面综合形貌误差的灰色分离方法,应用灰色动态滤波将表面形貌误差分离为表面粗糙度、表面波纹度和形状误差三项之和.该方法不要求被测表面的原始采样数据服从典型分布,可以对少数据表面轮廓进行误差分离,而且分离过程中不损失原始数据.仿真结果表明,灰色动态滤波是进行表面综合形貌误差分离的有效方法,其误差分离的结果与现行高斯滤波法具有良好的一致性.该方法可以作为国际标准的高斯滤波法的一种补充. 相似文献
5.
6.
7.
8.
9.
10.
现代产品几何技术规范(GPS)提出的操作及操作算子技术,为实现产品几何误差的数字化计量提供了必要的技术基础.研究分析了同轴度误差评定中的操作算子构成及选用原则,并给出最小二乘评定的数学模型.通过实例实现了阶梯轴的同轴度误差的数字化评定过程. 相似文献
11.
Vedat Savas Cetin Ozay 《The International Journal of Advanced Manufacturing Technology》2008,37(3-4):335-340
Turn-milling is a relatively new process in manufacturing technology, where both the workpiece and the tool are given a rotary
movement simultaneously. This paper presents an approach for optimization of cutting parameters at cylindrical workpieces
leading to minimum surface roughness by using genetic algorithm in the tangential turn-milling process. During testing, the
effects of the cutting parameters on the surface roughness were investigated. Additionally, by using genetic algorithms for
each of the cutting parameters (depth of cut, workpiece speed, tool speed and feed rate) minimum surface roughness for the
process of tangential turn-milling was determined according to the cutting parameters. 相似文献
12.
发现了PCD刀具切削时出现的用较高表面粗糙度的刀具可以加工出较低表面粗糙度的工件这一与传统切削理论相反的超越性加工现象,并对这一现象的判别标准进行了研究。 相似文献
13.
车床利用不同类型的刀具加工回转体外表面 ,刀具移动的速度和主轴转动的速度是影响转体表面加工精度和粗糙度的主要因素。即使在正常控制状态下 ,零件表面仍然出现异常波纹。分析和判断异常波纹的产生原理 ,就可有效地排除异常波纹 ,从而保障加工零件的表面粗糙度 相似文献
14.
为了稳定地获得高质量的微晶玻璃超光滑表面,采用一种先进的超光滑表面抛光方法——定偏心浸液式抛光方法。首先分析了微晶玻璃的性能和微观结构,得出实现其超光滑表面抛光所必须的技术条件;然后,论述了浸液式超光滑表面抛光方法的基本原理及其抛光工艺过程。采用该方法稳定地获得了亚纳米量级粗糙度的超光滑表面,粗糙度达到Ra0.3nm;最后,采用HHT方法,通过粗糙度分布曲线到Hilbert谱的数学变换,得出主要抛光工艺参数与表面粗糙度之间的相互影响关系。结果表明,HHT用于超光滑表面的检测和评价,对实际抛光过程提出有效指导,有助于获得高质量的超光滑表面。 相似文献
15.
16.
三维表面粗糙度的表征和应用 总被引:1,自引:0,他引:1
表面粗糙度会直接影响零部件的耐磨性、密封性以及抗腐蚀性等,是评定机械加工和产品质量的重要指标。现代科技水平的不断提高对零件表面性能的要求也日益严苛。传统的二维表面粗糙度的测量和表征已经不再能够满足技术发展的要求,三维表面粗糙度由于能够更加全面、真实地反映工件表面的状态而受到人们的重视,成为研究热点。本文回顾了三维表面粗糙度的发展历史,系统地介绍了三维表面粗糙度参数及标准的发展现状,分析了表面形貌与功能特性的联系,概述了三维粗糙度参数在制造业、生物医疗、摩擦学与材料科学等领域的广泛应用,并进一步指出了三维表面粗糙度表征和应用的发展方向。未来随着相关研究(比如,三维测量的溯源性、重复性、参数表征体系等问题)的深入以及三维表面测量手段的发展,三维表面粗糙度参数也将不断完善和推广,并更多地与实际功能相结合来预测并指导生产,确保工件的表面质量。 相似文献
17.
Zhao Tao Shi Yaoyao Lin Xiaojun Huang Tianran 《Journal of Mechanical Science and Technology》2016,30(3):1085-1093
Static blade ring process technology is a key part for gas turbine manufacturing, and the surface quality of the static blade ring has great influence on a gas turbine. To improve surface roughness of static blade ring, abrasive flow polishing process technology is studied. First, the range of extrusion pressure is obtained by using ANSYS software to analyze the blade deformation. Then a simplified model of surface roughness is estabalished according to experimental results and ANOVA’s results. At the same time, the optimal polishing parameters are confirmed through the response surface methodology. Finally, the polishing experiment is carried out by using the optimal polishing parameters. The experimental results demonstrate that the surface roughness of static blade ring decreased greatly (nearly 14.7%) compared with result using normal parameters. 相似文献
18.
19.
An optimization method of the machining parameters in high-speed machining of stainless steel using coated carbide tool for best surface finish 总被引:1,自引:1,他引:0
Ahmad Hamdan Ahmed A. D. Sarhan Mohd Hamdi 《The International Journal of Advanced Manufacturing Technology》2012,58(1-4):81-91
High-speed machining (HSM) has emerged as a key technology in rapid tooling and manufacturing applications. Compared with traditional machining, the cutting speed, feed rate has been great progress, and the cutting mechanism is not the same. HSM with coated carbide cutting tools used in high-speed, high temperature situations and cutting more efficient and provided a lower surface roughness. However, the demand for high quality focuses extensive attention to the analysis and prediction of surface roughness and cutting force as the level of surface roughness and the cutting force partially determine the quality of the cutting process. This paper presents an optimization method of the machining parameters in high-speed machining of stainless steel using coated carbide tool to achieve minimum cutting forces and better surface roughness. Taguchi optimization method is the most effective method to optimize the machining parameters, in which a response variable can be identified. The standard orthogonal array of L9 (34) was employed in this research work and the results were analyzed for the optimization process using signal to noise (S/N) ratio response analysis and Pareto analysis of variance (ANOVA) to identify the most significant parameters affecting the cutting forces and surface roughness. For such application, several machining parameters are considered to be significantly affecting cutting forces and surface roughness. These parameters include the lubrication modes, feed rate, cutting speed, and depth of cut. Finally, conformation tests were carried out to investigate the improvement of the optimization. The result showed a reduction of 25.5% in the cutting forces and 41.3% improvement on the surface roughness performance. 相似文献