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钛合金TB6铣削表面残余应力研究 总被引:1,自引:0,他引:1
钛合金TB6铣削加工表面残余应力对其使用性能可产生较大影响。试验研究了铣削参数,干铣削、冷铣削,刀具磨损等对表面残余应力的影响规律以及残余应力深度分析。结果表明,铣削速度和进给量对残余压应力影响明显,铣削深度对残余压应力影响小;干铣削表面表现为残余拉应力,残余拉应力随速度增大而增大,冷铣削表面表现为残余压应力,残余压应力随速度增大而减小;刀具磨损量对表面残余应力会产生较大的影响,随着刀具磨损量的增加,残余压应力逐渐增大;冷铣削导致的残余应力深度为20~30μm,干铣削导致的残余应力深度为30~40μm,刀具磨损量VB=0.18mm时铣削导致的残余应力深度50μm,最大残余应力值均出现在表面或者表面以下10μm内,残余应力沿深度方向分布大致呈"勺"型。研究结果对钛合金TB6铣削加工表面残余应力控制具有实用价值。 相似文献
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通过铣削试验分别研究了主轴转速(300,500,650,800,1 200 r·min-1)、铣削进给量(0.030,0.045,0.060,0.075,0.090 mm·r-1)和单道次铣削深度(0.20,0.35,0.50,0.65,0.80 mm)对FGH4113A镍基高温合金加工表面完整性的影响。结果表明:随着铣削进给量或单道次铣削深度的增大,加工表面的缺陷增多,表面粗糙度和硬度增大,表面残余应力逐渐由压应力转变成拉应力;随着主轴转速的增大,加工表面缺陷减少,表面粗糙度和硬度降低,残余压应力减小。在铣削速度超过800 r·min-1、单道次铣削深度小于0.35 mm、进给量控制在0.045 mm·r-1以下条件下,加工表面质量较好,表面粗糙度Ra在0.40μm左右,残余应力为压应力,且无明显硬化层。 相似文献
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为合理选择走刀策略,通过分析铣削过程中的切削力及铣削后的表面残余应力,研究走刀策略改变时对铝合金铣削的影响。在相同的切削参数条件下,采用整体硬质合金立铣刀对7050铝合金薄壁筋开展了高速和低速铣削试验,通过Kistler动态测力仪和X射线残余应力测量仪分别对薄壁筋在不同走刀策略下的切削力和表面残余应力进行了测量。结果表明,高速时采用绕圈顺铣、低速时采用单边顺铣的走刀策略能获得较小的切削力,不同走刀策略下的表面残余应力数值变化较小但波动明显,单边顺铣的残余应力波动最小,来回往复的波动最大。 相似文献
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针对AISI 4340高强钢加工质量较差的问题,采用硬质合金涂层刀具进行高速干铣削试验,研究切削参数对加工表面硬化和残余应力的影响。结果表明:铣削速度对加工表面硬化程度和硬化层深度影响最大,且随着铣削速度的增加,加工表面硬度值减小,硬化层深度逐渐减小;加工表面在进给、切削以及45°方向均产生残余压应力,铣削速度和每齿进给量对残余应力的影响较大;在v_c=400~500 m/min,f_z=0.03~0.06 mm/齿,a_p=0.2~0.3 mm,a_e=3~4 mm的切削条件加工时,可以获得较小的加工表面硬化程度和较大的表面残余压应力。该结果对高强度钢类零部件的生产具有理论指导意义。 相似文献
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F. Pettinari A. Couret D. Caillard G. Molénat N. Clément & A. Coujou 《Journal of microscopy》2001,203(1):47-56
Several examples of recent studies by in situ straining experiments in a transmission electron microscope performed in the Toulouse group (France) are presented. In particular, quantitative measurements of the features of the dislocation motion are described. These examples deal with individual or collective propagation of dislocations, which are submitted to various types of obstacle. Different metallic materials are investigated: magnesium, intermetallics, aluminium alloys and γ phase of a superalloy. 相似文献
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赵霞 《机械工业标准化与质量》2010,(8):19-20
<正>"中国制造"成为了眼下一大热门话题。近期相关媒体采访了几位我国著名的品牌问题研究专家,聆听专家们对我国目前品牌产品发展现状和未来发展的看法与建议。本刊将专家的观点经整理提供给大家,希望能对企业有所帮助。 相似文献
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《Journal of Mechanical Working Technology》1977,1(1):3-34
The technology of the rolling of sections has made great progress in Japan in the last 7 decades, and in the 15-year period since the introduction of universal mills development of the technology has been quite striking. Starting with the changes in mill layout, this progress is briefly discussed, and the technology that has brought about the development is described at length. Reference is made to the extension of universal rolling to the rolling of general sections, to the realization of computer control of the rolling of wide-flange beams and of full continuous rolling, to the automation of finishing operations, and, further, to energy-saving measures, which are the subject of major current interest.Lastly, the outlook for section rolling in the years ahead is considered on the basis of manufacturing facilities, manufacturing processes and demand trends, thus clearly indicating the direction in which the technology of section rolling is likely to proceed. 相似文献
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Akira Azushima 《Tribology International》1987,20(6):316-321
Research into, and the state of technology for, lubrication in steel strip rolling in Japan are reviewed. Both cold and hot strip rolling are discussed. Subjects covered include coefficient of friction and oil film thickness, friction pick-up, and roll wear. 相似文献
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《橡塑机械时代》2009,21(5):9-9
On February 17-19, Qingdao Soft-control took part in the 34th international rubber tire machinery exhibition and the international awards of the new technologies of tire in Humbury, Germany. This is the largest rubber tire machinery exhibition, which held once every year by the international rubber tire technology magazine organization with high authority. 相似文献
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The micro in the word of microtribology is defined as science and engineering supported by modern physics and chemistry. In the engineering area, the ultimate goal of microtribology is to create practical zero-wear devices. The importance of microtribology was recognized by Japanese scientists and engineers in the latter half of the 1980s, and much progress has been made in microtribological studies of mechanisms of friction, lubrication with very thin liquid films, and microwear processes. 相似文献
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尚项绳 《机械工业标准化与质量》2009,(7):11-13,17
我国的拖拉机生产从20世纪50年代后期引进国外样机开始。经历了前期仿制、自行研制、技术引进和自主开发几个阶段。拖拉机标准也随之蓬勃发展。经过50多年的发展,我国拖拉机行业已形成以全国拖拉机标准化技术委员会为基本活动单元的行业标准化工作体系。目前我国有关拖拉机的各类标准总计210项。其中国家标准114项,机械行业标准93项。其他行业标准三项。在与拖拉机有关的88项国际标准中。修改或等同采用国际标准及国外先进标准58项。国际标准的转化率达65.9%。本期,我们特邀全国拖拉机标准化技术委员会秘书长尚项绳、中国农业机械学会拖拉机学会陈英超、江苏常发集团农业装备公司品质部长廖汉平、常州东风农机集团有限公司质量总师苏东林对拖拉机行业及标准发展.以及企业自身建设做详细介绍。 相似文献