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《CIRP Annals》2019,68(1):109-112
This paper describes a new virtual model for predicting the uncut chip geometry and cutting forces in power skiving, which is a high-speed, versatile gear cutting process. The developed kinematic model is applied in a dexel-based solid modeling engine to extract three-dimensional uncut chip geometry, from which the two-dimensional cross section is obtained via Delaunay triangulation. Cutting velocities along discretized cutter edges are calculated and used to determine the effective rake and oblique angles. Then, force predictions are made using the oblique cutting model and validated using measurements from power skiving trials performed on a DMG MORI NT5400DCG mill-turn machine. 相似文献
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针对内齿轮刮齿加工过程中,由于轴交角误差的存在而影响齿轮加工精度的问题,为了提高刮齿机的加工精度,首先建立了无进给、刀具进给和工件进给三种运动方式下刀具与工件之间的运动学模型;其次,通过分析不同轴交角误差方向下刀具和工件之间的相对运动关系,研究了内齿轮齿廓加工误差的产生机理;然后,通过建立多因素耦合关系模型,分析了不同轴交角误差方向对刮齿加工误差的影响程度,获得了最佳的轴向进给方式和轴交角误差方向;最后,通过样机试切实验验证了理论分析的有效性,样机满足6级加工精度要求。 相似文献
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采用空气辅助干法共混、冷压烧结并车削成膜的方法制备了SiO2填充量为35wt%、厚度为50 μm的聚四氟乙烯(PTFE)基复合薄膜。系统研究了SiO2颗粒粒径对SiO2/PTFE薄膜复合材料的孔洞缺陷和力学性能等的影响,并研究了SiO2在PTFE中的分散情况及分子间相互作用对其性能变化的影响机制。结果表明,随SiO2粒径的逐渐增大,其在PTFE中的分散趋于均匀,同时PTFE能更好地包覆粒子,因此SiO2/PTFE薄膜孔洞缺陷逐渐减少,力学性能逐渐增强;当SiO2的粒径D50为12 μm时,其在PTFE中的分散均匀性最佳,SiO2/PTFE复合薄膜孔洞缺陷最少,具有较好的力学性能,断裂伸长率达19.5%,拉伸强度达9.2 MPa。 相似文献
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通过对芙蓉绿花岗石石材细磨、精磨、抛光的实验研究,找出了适合于芙蓉绿花岗石石材加工的最佳工艺参数。 相似文献
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A heuristic for the skiving and cutting stock problem in paper and plastic film industries
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Yan Chen Xiang Song Djamila Ouelhadj Yaodong Cui 《International Transactions in Operational Research》2019,26(1):157-179
This paper investigates the skiving and cutting stock problem (SCSP) encountered in the paper and plastic film industries, in which a set of nonstandard reels generated from previous cutting processes are used to produce finished rolls through the skiving and cutting process. First, reels are skived together lengthwise to form a reel‐pyramid (a polygon), and then the reel‐pyramid is cut into finished rolls of small widths. Depending on if a reel can be divided lengthwise into subreels to form the reel‐pyramid, the problem can be classified into divisible SCSP (DSCSP) and indivisible SCSP (ISCSP). In this paper, two integer programming (IP) models are proposed for DSCSP and ISCSP, respectively. A sequential value correction procedure combined with the two IP models (SVCTIP) is developed to solve the two SCSPs. The effectiveness of the SVCTIP is demonstrated through extensive computational tests. 相似文献
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近年来,随着机床结构的不断改进,机床及工件夹具刚性的提高,刀具材料的进步,特别是涂层技术的发展,使得刮齿的加工质量及稳定性日益提高,逐渐成为小模数淬硬齿轮精加工中成熟的工艺,国外许多企业已逐渐采用刮齿替代磨齿作为精加工方法.介绍刮齿工艺的工作原理和工艺特点,结合典型硬齿面齿轮零件,论述刮齿工艺在工程机械变速器硬齿面齿轮加工中的应用. 相似文献
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在介绍硬齿面齿轮加工工艺基础上,重点分析了硬质合金刮削滚刀所存在的问题,同时介绍了两种新型叠片式蜗杆型硬质合金滚刮刀。采用蜗杆型研齿蜗杆型珩轮珩齿可作为淬硬齿轮的补充加工手段,其特点为经济、高效。 相似文献