共查询到19条相似文献,搜索用时 242 毫秒
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付仙良 《现代制造技术与装备》2022,(7):60-62+77
金属铣削加工过程中不可避免地会出现一些毛刺,一般存在于工件的过渡位置或边缘,形状不规则。因此,去除毛刺一直是金属加工行业的难点。鉴于此,根据铣削加工中毛刺的形成规律,先采用正交试验法研究铣削加工中产生毛刺的影响因素,找出影响毛刺的主要因素,进而得出最小毛刺的工艺方案组合,最后分析应对铣削加工中产生毛刺的对策,提出要关注刀具材料、刀具结构及涂层等,从而科学设计铣削加工工艺。 相似文献
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《机械工程师》2016,(8)
为了解决变槽角自调心弹簧托辊的故障数据少的问题,并提高故障树定量分析的可靠性,将灰色关联分析方法与故障树分析方法有机结合,引入到变槽角自调心弹簧托辊的故障分析诊断中。通过故障树底事件的重要度计算以及灰色关联度的计算,依据关联度的大小,将各个最小割集对顶事件的影响程度进行排序,对变槽角自调心弹簧托辊的故障模式发生的可能性进行分析判断,在19个底事件构成的19个最小割集中,对可能使变槽角自调心弹簧托辊产生事故的可能原因进行了排序,从而为准确地预防变槽角自调心弹簧托辊产生事故提供了理论依据。基于此,灰色关联理论的变槽角自调心托辊故障树分析方法可行,结果可靠。 相似文献
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微细铣削加工中抑制微毛刺生成的新方法 总被引:1,自引:0,他引:1
《工具技术》2015,(8):7-11
在微型零件的微细铣削过程中,微毛刺的产生是影响零件质量的重要因素。本文提出了一种通过构建辅助支撑抑制微毛刺产生的新方法。通过分析微毛刺的产生机理,发现微细加工的尺度效应和被加工材料的塑性变形是产生毛刺的主要原因,尤其在被加工材料的边界处毛刺更为明显。在工件的边界上构建辅助支撑结构可以增强工件边界的刚度,并抑制工件边界处材料的塑性变形。使用微细刀具进行微细铣削铍青铜的加工试验证明该方法可以抑制微毛刺的生成。 相似文献
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微铣削是以较低生产成本加工高质量微小零件和微观结构表面的有效方式,而相关的工作机理尚处于研究阶段。通过运动学仿真分析和试验研究相结合的方法,设计一组星形槽微铣削试验,研究微型铣床主轴摆角对槽底表面质量和毛刺成形的影响。研究发现:当主轴摆角在±1.5°范围内时,表面粗糙度值Ra<0.1μm,但易成形大毛刺且毛刺数量多;随着主轴摆角增大,槽底表面粗糙度值增大,但毛刺明显减少,且多为小毛刺。仿真结果与试验数据相符,但由于试验中存在刀具磨损和机床误差等因素,试验检测的粗糙度值高于仿真计算结果。 相似文献
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微铣削加工技术在制造航空航天等领域所用的三维复杂微结构零件方面具有明显优势,而微铣削在加工机理、对表面质量要求等诸多方面都与常规铣削有着明显不同,因此非常有必要对微铣削加工机理进行研究。主要从切削刃钝圆半径引起的尺寸效应机制、刀具径跳对微铣削加工的影响机理、加工中毛刺形成机理以及加工中表面形成机理这四个方面对微铣削加工机理进行综述,介绍每个方面相对于常规铣削的不同,并重点分析切削刃钝圆半径的尺寸效应和微刀具径跳的产生原因、危害及研究现状,以及从仿真和试验两个方面对微铣削中毛刺形成过程和表面形成过程进行总结,对影响因素进行分析,并提出抑制毛刺的一些方法。探讨微铣削加工机理研究仍需注重解决的问题,为其后续发展方向提出一些建议。 相似文献
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M. J. Chen H. B. Ni Z. J. Wang Y. Jiang 《The International Journal of Advanced Manufacturing Technology》2012,62(9-12):901-912
Burrs generated along the finished edges and surfaces in micro-milling operation have significant impact on the surface quality and operational performance of the finished parts and microstructures. In order to obtain a better recognition of burr generation process, 3-dimensional micro-ball end milling operation FEM models on Ti–6Al–4V have been established. As a result, a newfound type of burr lying on the slot base has been detected. According to their generating locations, burrs discovered in the simulation are classified into four types: entrance burr, exit burr, top burr, and slot base burr. Their formation processes, especially the generation procedure of slot base burr, are carefully investigated and analyzed. Furthermore, the correlation between cutting parameters and top burr sizes in micro-ball end milling is investigated. At last, effective validation experiments for the proposed model are conducted and good agreements are achieved in the morphologies of burrs between the experiments and simulations. It can be concluded that the adoption of a small ratio of axial depth of cut to the mill radius has a significant effect in the reduction of top burr generation in micro-ball end milling operation. 相似文献
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Mechanical micromachining is increasingly finding applications in fabrication of components in various fields, such as, biomedical devices, optics, electronics, medicine, communications and avionics. In order to ensure adequate functionality, there are stringent requirements for form and finish in case of biomedical devices like cochlear implants and metallic optics. This necessitates that the post machined surface must be burr free. To address these issues in micromachining, this paper presents results of an experimental study to investigate the influence of main process parameters i.e. speed, feed rate, depth of cut, tool diameter and number of flutes on the formation of the various types of burrs i.e. exit burrs and top burrs produced during micro-end milling operation. The experiments performed using Taguchi method shows that three types of burr formation mechanisms prevail during micro-end milling operations; these are: lateral deformation of material, bending and tearing of the chip. Also, three types of burrs were observed include: Poisson burr, rollover burr in down milling and tear burr in up milling. Further, it is observed that the depth of cut and the tool diameter are the main parameters, which influence the burr height and thickness significantly. However, the speed and the feed rate have small to negligible effect on the burr thickness and height. Besides the experimental analysis, the paper presents an analytical model to predict the burr height for exit burr. The model is built on the geometry of burr formation and the principle of continuity of work at the transition from chip formation to burr formation. Note that prediction of burr height in micro-end milling is extremely challenging due to the complex geometry of material removal and microstructural effects encountered during cutting at that length scales. The model fares well and the prediction errors range between 0.65 and 25%. 相似文献
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在夹具系统刚性不足的情况下,铝合金缸盖燃烧室和覆盖面很容易出现毛刺。文中介绍了PCD铣刀出现毛刺的原因。研究PCD面铣刀切削刃的几何参数对于毛刺影响的研究。提出了一种在刚性不足的切削系统下,达到既没有振纹又没有毛刺的方法。 相似文献
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以平面磨削淬硬实验为基础,对磨削淬硬加工中两侧方向毛刺的形式进行了分类,同时研究了试件磨削方向(长度方向)上两侧毛刺尺寸的变化以及磨削用量对磨削淬硬加工中两侧方向最大毛刺尺寸的影响。结果表明:从试件切入端到切出端,两侧方向毛刺尺寸逐渐增大;在实验条件下,随着磨削深度的增大或工件进给速度的减小,两侧方向毛刺最大尺寸逐渐增大;同时,给出了抑制或减小两侧方向毛刺尺寸的方法。 相似文献