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通过采用一种新型的试验装置,可重现在了较大的切削速度范围内(从15~100m/s),正交切削下的切削过程.该试验设备可以记录在正交切削下的切削过程中法线方向上和切线方向上的作用力数值.从而在很大的切削速度范围内,可以对刀具和切屑之间的摩擦力进行分析.给出了切削力的分力变化和摩擦系数变化的情况.此外,通过可以使用一台高速摄影机,记录了高速加工中,切屑的形成过程的图像. 相似文献
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高速切削技术及高速切削可转位铣刀的研究 总被引:4,自引:0,他引:4
高速切削是先进制造技术中最重要的加工工艺之一,而切削刀具是实现这一工艺的关键。论文介绍了高速切削技术,以及高速切削技术要求的高速切削刀具,特别说明的是高速切削铣刀;论述了高速切削的可转位铣刀的特点、切削刀具材料和刀体结构。 相似文献
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高速切削过程测温方法综述 总被引:3,自引:1,他引:3
切削温度与加工精度和刀具磨损密切相关,高速切削过程中切削温度随着材料,刀具,切削用量的选择不同而呈现出与普通切削过程不同的变化规律.本文归纳了高速切削当中切削温度的测定方法,并指出了各种方法的优缺点及适用性. 相似文献
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目前在机械加工领域,沟槽广泛出现在精密设备的关键件上,由于沟槽是由高精度的异形槽构成,因此采用传统加工工艺难度很大,加工成本过高。这里将高速切削技术应用到沟槽类零件的加工中,提出了零件的工装设计与装夹方案。并对高速切削过程中涉及的粗加工、半精加工和精加工策略进行探讨,最后总结出加工中缓解刀具寿命下降的工艺措施。 相似文献
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高速切削技术的发展及应用 总被引:7,自引:1,他引:7
高速切削技术已成为切削加工的主流和先进制造技术的一个重要发展方向。高速切削较之常规切削是一种创新的加工工艺和加工理念。分析了高速切削技术的特点,研究了高速切削的关键技术:机床技术、刀具技术和工艺技术,介绍了高速切削技术在航空航天和汽车制造等领域的发展及应用。 相似文献
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介绍了高速切削加工技术,详细分析了高速切削技术的特点,研究了高速切削的关键技术——机床技术、刀具技术、工艺技术及其发展,并对高速切削技术的应用作了简述。 相似文献
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结合高速切削加工技术和刀具材料的研究,综合论述高速切削加工刀具材料的性能特点、研究进展和应用,展望高速切削加工刀具材料的未来。 相似文献
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A model is presented of stationary shearing produced during the chip formation in orthogonal cutting. The work material is supposed to be a thermal sensitive viscoplastic rigid material. The effects of material parameters, of heat conductivity and of inertia on the distribution of strain rate and of temperature in the primary shear zone are analysed. The cutting forces are calculated for a large range of cutting speeds including high speed machining. The results are obtained by developing a simple one-dimensional modelling of the primary shear zone. Experimental measurements are compared with the theoretical results. 相似文献
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Wear resistance of coatings in high speed gear hobbing 总被引:2,自引:0,他引:2
Coating technology is one means of achieving a crucial enhancement in tool performance, especially in hobs that were among the first tools to be coated on a large scale. Nevertheless only few detailed analysis of wear mechanism have been done on field machines. The bifunctional coatings (combination of a tough, hard and refractory coating and of a self lubricating coating possessing a good thermochemical and abrasion resistance but a lower hardness) are very interesting since it is difficult to get a simple coating showing all these characteristics. The use of bilayer coatings raises several problems especially for dry and high speed cutting. Therefore, in order to investigate the behaviour of these bifunctional coatings, hobs have been coated by physical vapour deposition (PVD) methods. After the elaboration of a procedure for hobs testing, field tests have been performed. Results of tool life tests and investigations on tool wear mechanisms for different coated hobs are presented and discussed. The interesting performance in high speed gear hobbing of sintered high speed steel (HSS) hobs (ASP2052) combined with a (Ti,Al)N+MoS2 coating is particularly underlined. 相似文献
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Micro ultrasonic machining (micro-USM) is an unconventional micromachining technology that has capability to fabricate high aspect ratio micro-holes, intricate shapes and features on various hard and brittle materials. The material removal in USM is based on brittle fracture of work materials. The mechanical properties and fracture behaviour are different for varied hard and brittle materials, which would make a big difference in the processing capability of micro-USM. To study the processing capability of USM and exploit its potential, the material removal of work materials, wear of abrasive particles and wear of machining tools in USM of three typical hard and brittle materials including float glass, alumina, and silicon carbide were investigated in this work. Both smoothed particle hydrodynamics (SPH) simulations and verification experiments were conducted. The material removal rate is found to decrease in the order of glass, alumina, and silicon carbide, which can be well explained by the simulation results that cracking of glass is faster and larger compared to the other materials. Correspondingly, the tool wear rate also dropped significantly thanks to the faster material removal, and a formation of concavity on the tool tip center due to intensive wear was prevented. The SPH model is proved useful for studying USM of different hard and brittle materials, and capable of predicting the machining performance. 相似文献