共查询到20条相似文献,搜索用时 125 毫秒
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运用超声波振动驱动PCD刀具对Stavax工具钢进行切削试验,并对比研究普通切削和超声波振动切削的加工工件表面粗糙度和刀具磨损试验结果,获得超声波振动切削时工件表面粗糙度、刀具磨损与加工参数之间的变化规律. 相似文献
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用试验的方法研究了奥-贝球墨铸铁的加工表面形态、已加工表面粗糙度,分析了切削用量和刀具几何角度对加工表面粗糙度的影响.结果表明,已加工表面质量与刀具切削刃不平整及材料组织有关。为提高加工表面质置,必须优选切削参数,重视刀具磨损、后刀面粗糙度及工件材料组织的缺陷。 相似文献
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针对滚动轴承套圈硬车削加工过程中表面质量存在的问题,对硬车削过程中切削用量和刀具参数对表面粗糙度的影响进行了研究,采用CBN刀具进行了6205滚动轴承套圈的硬车削加工试验,将进给量、切削速度、切削深度和刀尖圆弧半径作为试验因子,通过正交试验分析了它们对零件加工后表面粗糙度的影响规律,并归纳出了该试验范围内的最佳切削用量和刀具参数组合。研究结果表明,进给量对表面粗糙度的影响最大,刀尖圆弧半径对表面粗糙度的影响次之,切削速度对表面粗糙度的有一定影响,切削深度对表面粗糙度的影响非常小。 相似文献
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进行了端面铣削加工对镁合金AZ21B表面特征的性能实验。在干式加工环境下,以刀具前角、线速度、最大切削厚度、切削深度为影响因子,以表面粗糙度作为分析表面完整性的指标,采用硬质合金刀具进行实验,实验结果表明:镁合金铣削加工中,随着切削深度、线速度、最大切削厚度的增加,工件的表面粗糙度也随之增加,其中切削深度小于6 mm、线速度小于1800 mm/s、最大切削厚度小于0.07 mm时,表面粗糙度值均为Ra1.0μm以下,可实现镁合金的高精度加工;同时刀具前角对镁合金加工至关重要,表面粗糙度随着刀具前角的增加呈现先增加、后降低的规律;当刀具前角在8°~16°区间内,表面粗糙度逐渐增加;当刀具前角为20°时,工件的表面质量相对较高,表面粗糙度为Ra0.5μm左右;结合整体试验的加工情况,特殊情况下刀具前角可以优先选择负角度加工。 相似文献
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Junfeng Xiang Siqin Pang Lijing Xie Xin Hu Song Peng Tao Wang 《The International Journal of Advanced Manufacturing Technology》2018,98(5-8):1237-1251
This paper focused on high-speed milling of Al6063 matrix composites reinforced with high-volume fraction of small-sized SiC particulates and provided systematic experimental study about cutting forces, thin-walled part deformation, surface integrity, and tool wear during high-speed end milling of 65% volume fraction SiCp/Al6063 (Al6063/SiCp/65p) composites in polycrystalline diamond (PCD) tooling. The machined surface morphologies reveal that the cutting mechanism of SiC particulates plays an important role in defect formation mechanisms on the machined surface. In high-speed end milling of Al6063/SiCp/65p composites, the cutting forces are influenced most considerably by axial depth of cut, and thus the axial depth of cut plays a dominant role in the thin-walled parts deformation. Increased milling speed within a certain range contributes to reducing surface roughness. The surface and sub-surface machined using high-speed milling suffered from less damage compared to low-speed milling. The milling speed influence on surface residual stress is associated with milling-induced heat and deformation. Micro-chipping, abrasive wear, graphitization, grain breaking off, and built-up edge are the dominated wear mechanism of PCD tools. Finally, a series of comparative experiments were performed to study the influence of tool nose radius, average diamond grain size, and machining parameters on PCD tool life. 相似文献
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为了研究车削钛合金TC11时切削速度和刀具磨损对已加工表面质量的影响,选用涂层硬质合金刀片CNMG120408在不同切削条件下进行车削试验,分析后刀面磨损量随切削时间的变化规律;对比磨损刀具与新刀具切削的工件表面,观察表面粗糙度、表面形貌、显微硬度以及表层微观组织情况,分析切削速度和刀具磨损对已加工表面质量的影响规律。试验结果表明:在刀具磨损初期,即新刀具切削时,切削速度从60m/min增加到100m/min,刀具磨损程度增大,表面粗糙度值降低,硬化层深度减小,加工硬化程度略微增大,表面塑性变形层深度减小;在刀具磨损终期,不同切削速度下的表面粗糙度增大,表面形貌变差,硬化层深度和加工硬化程度增加,表面变形程度增大,塑性变形层深度增加。 相似文献
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R. Bian N. He L. Li Z. B. Zhan Q. Wu Z. Y. Shi 《The International Journal of Advanced Manufacturing Technology》2014,71(1-4):411-419
Silicon carbide particle-reinforced aluminum matrix (SiCp/Al) composites have attracted considerable interest as potential materials due to their excellent engineering properties. Many research works have been done associated with turning SiCp/Al in the past. However, it still lacks of experience on milling of SiCp/Al composites. This paper presents an exploratory study on precision milling of SiCp/Al composites with higher volume fraction (SiCp, 65 %) and larger particle size. The experiments were conducted on a Kern MMP 2522, high-precision micromilling machine center. A single flute monocrystalline diamond end mill was used to mill straight grooves with cutting parameters in a few micros. The machined surface quality including surface roughness and surface topography were studied. The cutting mechanisms of SiC particle and tool wear characters were also investigated. The results showed that mirror-like surface with surface roughness around 0.1 μm Ra can be achieved by precision milling with small parameters in the range of a few micros. Most of the SiC reinforcements were cut in partial ductile way with microfractures and cracks on the machined surface; tool wear included chipping and cleavage on monocrystalline diamond edge. A large flank wear on tool bottom face was observed and suspected to be caused by coaction of chemical transition and mechanical abrasion. 相似文献
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S. Aravindan A. Naveen Sait A. Noorul Haq 《The International Journal of Advanced Manufacturing Technology》2008,37(11-12):1069-1081
Nowadays, glass fiber reinforced plastics (GFRP) play a vital role in many engineering applications as an alternative to various heavy exotic materials. In GFRP polymeric composites, the matrix of polymer (resin) is reinforced with glass fibers. Such composite pipes are finding applications not only in construction industries, but also in the transportation of corrosive fluid. These pipes are manufactured through hand lay-up or filament winding processes. Though the technology of composite manufacturing is advanced, near-net-shaped components with the required surface finish quality can be achieved only by machining. This paper mainly focuses on the evaluation of the surface finish of the machined surface of GFRP pipes and associated studies. Experiments were conducted through the established Taguchi’s design method. In this work, the machining characteristics are investigated based on surface roughness and tool wear. The machining parameters are also optimized by employing statistical techniques, using the technique of analysis of variance (ANOVA) obtained from regression analysis. Both simple regression and cross product regression methods were employed and their suitability was also studied. An empirical model is also developed to determine the percentage of improvement in tool wear and surface finish. The machined surface exhibited a better surface finish of 4 to 8 microns, whereas the surface roughness of the unmachined surface was observed to be around 80 to 100 microns. 相似文献