共查询到20条相似文献,搜索用时 578 毫秒
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2014年10月16日,山高刀具新任大中华区董事总经理Bo Udsen先生在北京召开媒体见面会,业内多家媒体到会.
现年57岁的Bo Udsen先生于1987年加入山高刀具,拥有丰富的销售及管理经验.他于今年8月1日履新,此前10年一直担任山高丹麦董事总经理,并同时兼任大客户经理,多次来往中国地区,因此他对中国并不陌生.今后,Bo Udsen先生将在上海工作.
发布会上,Bo Udsen先生宣布山高刀具将在2018年实现大中华区销售12亿瑞典克朗的计划也进入了快速奔跑阶段.且不说此目标与目前近5亿元人民币的销售额翻了一番,5年将创造以往20年的业绩,只看行业形势持续低迷不起的局面,就知道山高刀具未来3年的征途并不轻松.对此,Bo Udsen先生信心满满,他说山高针对中国市场制定了很多因地制宜的策略,能够保证此业绩目标的顺利实现. 相似文献
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通过分离式霍普金森压杆(SHPB)动态压缩试验研究了体积分数为45%的铝基碳化硅颗粒增强复合材料(SiCp/2024Al)在大应变率和变形温度范围内的热变形行为,分析了热变形参数(变形温度和应变率)对流动应力的影响。研究发现:变形温度和应变率对复合材料的流变应力、抗压强度、弹性模量、应变率敏感性有显著影响;抗压强度、弹性模量随变形温度的增大而减小,而抗压强度、弹性模量、应变率敏感性随应变率的增大出现了拐点。根据试验结果,结合热力学和统计损伤力学理论,建立了描述SiCp/2024Al复合材料动态热变形行为的连续损伤本构模型,预测的流动应力与试验结果吻合较好,表明所建立的模型能够准确地描述SiCp/2024Al复合材料动态热变形行为。 相似文献
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采用热压烧结法制备了三种不同成分的SiC颗粒增强镁-锌-锆基复合材料,使用LMR-1型低频力学弛豫谱测试系统研究了铸态镁-锌-锆合金及热压烧结SiCp/镁-锌-锆基复合材料的阻尼性能随频率和温度的变化关系.结果表明:SiC颗粒的加入使复合材料的阻尼性能比基体合金有显著提高;另外随着合金中锌含量的增加,复合材料的内耗值不断下降;在频率为3×10-3~7Hz范围内,基体合金及复合材料的内耗值均随着频率的增加先快速减小随后又逐渐增大;在本试验条件下SiCp/Mg-0.93%Zn-0.70%Zr基复合材料的内耗值最大,该复合材料在50~100℃的温度范围内出现弛豫内耗峰. 相似文献
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Drilling of hybrid aluminium matrix composites 总被引:1,自引:0,他引:1
S. Basavarajappa G. Chandramohan J. Paulo Davim M. Prabu K. Mukund M. Ashwin M. PrasannaKumar 《The International Journal of Advanced Manufacturing Technology》2008,35(11-12):1244-1250
This paper presents the influence of cutting parameters on thrust force, surface finish, and burr formation in drilling Al2219/15SiCp and Al2219/15SiCp-3Gr composites. The composites were fabricated using the liquid metallurgy method. The tools used were commercially available carbide and coated carbide drills. The results revealed that feed rate had a major influence on thrust force, surface roughness, and exit burr formation. Graphitic composites exhibit lesser thrust force, burr height, and higher surface roughness when compared to the other material. The reduced thrust force and burr height is attributed to the solid lubricating property of the graphite particles. The higher surface roughness value for Al2219/15SiCp-3Gr composite is due to the pullout of graphite from the surface. The chips formed when machining graphitic composites are more discontinuous when compared to SiCp reinforced composites and hence advantageous. 相似文献
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由于大量高硬度增强相SiC颗粒的存在,高体积分数铝基碳化硅(SiCp/Al)复合材料的机械加工十分困难。旋转超声加工被认为是加工这种材料的有效方法。通过超声辅助划痕试验,分析高体积分数SiCp/Al复合材料旋转超声铣磨加工的材料去除机理。在超声振动的作用下,材料中铝基体发生塑性变形,其表面得到夯实;SiC增强相被锤击成细小的颗粒而发生脱落,形成较大的空洞。由于材料加工的缺陷大多产生于SiC颗粒的去除过程中,SiC颗粒的去除方式对加工表面的质量起着决定性的作用,选择合适的工艺参数可以有效提高加工表面质量。旋转超声加工工艺特征试验表明,超声振动可有效降低切削力;主轴转速对轴向切削力的影响最大,其次是进给速度,切削深度对轴向切削力的影响较小;另外主轴转速对表面质量的影响效果也最大,并随主轴转速的增大表面粗糙度增大。因此在加工过程中,可以适当加大切削深度,在保证加工质量的基础上,选择较大的进给速度,在保证刀具寿命的前提下,选择合适的主轴转速,以获得较优的加工表面质量和加工效率。 相似文献
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SiCp尺寸及含量对Al基复合材料磨损表层、亚表层形貌的影响 总被引:3,自引:0,他引:3
分别以亚微米级 (130nm)、微米级 (14 μm)SiCp和微米级 (2 0 0目 )Al粉为原料 ,采用冷压烧结和热挤压方法制备出不同体积含量 (1 5 %、 5 % )亚微米、微米级SiCp增强Al基复合材料。研究复合材料磨损表面、亚表层形貌 ,结果表明 :SiCp/Al复合材料具有优良的耐磨性能 ,随着SiCp尺寸的增大 ,含量的增高 ,耐磨性能提高 ;其耐磨机理是磨损表面和亚表层在摩擦推挤形变的作用下形成了Al基体加尺寸适中、近球状、分布弥散SiCp的耐磨组织 相似文献
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Xun Li Fan Bai Yu Fu 《The International Journal of Advanced Manufacturing Technology》2017,91(9-12):3007-3014
With the volume fraction of SiC increasing, the machinability and electrical machining performance of SiCp/Al metal matrix composites (SiCp/Al MMCs) decreases gradually. Therefore, it is difficult to machine small holes in high volume fraction SiCp/Al MMCs. Based on the material properties and grinding mechanism, the small hole helical mill-grinding process in high volume fraction SiCp/Al MMCs with super abrasive wheel is presented. Furthermore, the wheel kinematic characteristic is analyzed during hole helical mill-grinding. The essential reason for reducing the hole exit defects is presented, which is changing the main feeding direction from axial to tangential. Meanwhile, the experiments of small hole helical mill-grinding in 65% volume fraction SiCp/Al MMCs are carried out. The experimental results show this process has the superiority in decreasing axial force, avoiding hole exit defects, and improving the small hole machinability. Under the premise of no obvious defects in the orifice and the inner surface roughness no more than Ra0.4 μm, the wheel grits and parameters in rough and finish machining are optimized to increase the hole machining efficiency and wheel life. At last, the experimental results fully illustrate that the small hole helical mill-grinding in high volume fraction SiCp/Al MMCs with high efficiency and quality has great superiority and application value. 相似文献
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Numerical and experimental studies on the temperature field in precision grinding of SiCp/Al composites 总被引:1,自引:1,他引:0
L. Zhou S. T. Huang C. Y. Zhang 《The International Journal of Advanced Manufacturing Technology》2013,67(5-8):1007-1014
During precision machining of SiCp/Al composites, the temperature of the workpiece surface directly affects the machining quality. In this paper, a triangle heat source model was used to calculate the heat flow during grinding of SiCp/Al composites, then, a three-dimensional finite element method was employed to investigate the temperature distribution at different process parameters, i.e., grinding depth and feed speed of the worktable. In addition, the temperature measures using embedded thermocouple were applied to compare with predictions from the thermal model. The results indicate that the grinding temperature predicted by the finite element method agrees well with the experiment data, and the triangle heat source model was suitable for estimating the workpiece temperature of precision grinding. 相似文献