共查询到18条相似文献,搜索用时 109 毫秒
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带减摩槽刀片在加工不锈钢中的应用 总被引:1,自引:1,他引:0
通过分析不锈钢切削加工过程中切屑与刀具前刀面之间的摩擦情况,提出减少切屑与刀具前刀面的接触面积能降低切屑与刀具之间的摩擦阻力,从而减小主切削力。据此,设计了两种带减摩槽的三维槽型刀片,并通过切削试验、切削力检测验证了减摩槽能有效减小主切削力并改善刀片槽型断屑性能的结论。 相似文献
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带减摩槽刀片切削机理的研究 总被引:2,自引:2,他引:0
对带减摩槽刀片的切削机理进行了理论研究,考察了减摩槽对主切削力(FZ)以及切削变形和断屑性能的影响,在此基础上得出三维断屑槽设计的一些有益结论,并通过平前刀面刀片和带减摩槽刀片的对比切削试验验证了这些结论,最后据此设计了一种新型断屑槽。 相似文献
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<正> Ingersoll切削刀具公司最近推出27J2V系列可转位重型粗加工立铣刀,该系列铣刀专门用于钢,不锈钢和铸铁等工件的重型粗切削加工。该刀具设计为正前角轴向几何结构和装有硬质合金排屑槽刀片,可减少切削力和生产动力。该刀片切削刃排列新颖独特,可直接减少切削力。加工效率高,是重型粗加工的理想刀具。 相似文献
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《工具技术》2021,(9)
针对微织构刀具加工过程中的衍生切削效应,利用正交微切削单元开展了微坑刀具及无织构刀具的钛合金微切削实验,从切屑底面形貌、微坑黏结状态等方面分析了微坑刀具微切削性能;通过ABAQUS软件对微织构刀具微切削钛合金过程进行有限元模拟,分析微坑织构的衍生切削作用对刀-屑接触应力分布及切削力的影响,优化设计微坑边缘过渡区参数并进行切削仿真分析。实验和仿真结果表明,微坑会减小前刀面黏结,存储微屑,减小刀-屑接触应力,提高刀具减摩性能;但微坑与切屑的衍生切削作用会增大瞬时切削力,降低切削过程平稳性。此外,微坑过渡区优化可改善切削过程波动,降低切削力,改变切屑形态,改善切屑在微坑的流入/流出状态,有助于减小微坑织构衍生切削效应,提高织构的减摩效果。 相似文献
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通过分析两种进口精车不锈钢断屑槽刀片,对该正角刀片的槽型进行测绘并进行切削对比试验,系统分析其槽型结构。结果表明:刀片的前角、刃宽和复合断屑台在加工不锈钢时对断屑起关键作用。通过试验、综合分析和验证后,确定不锈钢精加工正角刀片槽型最优结构为5°单前角、0刃宽和复合断屑台。 相似文献
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在数控车削加工中,断屑、排屑的效果如何不仅与所采用的机床、加工工艺、被加工对象的材质特性有关,也和操作者选用的切削刀片的三维断屑槽型有密切的关系。准确、快速地选用切削刀片的三维断屑槽型,将对生产效率的提升、产品质量的保证、设备及劳动者的安全性的确保等产生深刻的影响。 相似文献
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刀具切削钛合金时存在切削温度高、单位面积上切削力大等问题,微织构刀具可以有效减小摩擦力,减小切削力。通过正交实验法设计微织构参数,研究微织构参数对Al 2O 3/La 2O 3/(W,Mo)C无黏结相硬质合金刀具以及YG8刀具切削钛合金实验的切削性能影响。实验结果表明,合适参数的沟槽型微织构能有效降低Al 2O 3/La 2O 3/(W,Mo)C无黏结相硬质合金刀具和YG8刀具切削TC4钛合金的切削力,相同沟槽参数下,无黏结相硬质合金刀具的切削力明显低于YG8刀具的切削力;合适参数的沟槽型微织构能有效降低刀具刀屑界面的摩擦系数,相同沟槽参数下,无黏结相硬质合金刀具的摩擦系数大都低于YG8刀具的摩擦系数;沟槽深度10μm、沟槽间距100μm以及沟槽宽度30μm的沟槽参数下,切削钛合金时,无黏结相硬质合金刀具前刀面无明显磨损,后刀面只有边界磨损,YG8刀具发生崩刃,前刀面出现切屑的滞留。 相似文献
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Potassium dihydrogen phosphate (KH2PO4 or KDP) crystal is a typical soft-brittle optical crystal, and the size effect and brittle cutting mode are easy to appear in micro ball end-milling of KDP crystal. In this paper, micro-grooving experiments are conducted to study the size effect and brittle cutting in micro ball end-milling of KDP crystal with different feed rate and depth of cut. The cutting force, machined groove base quality and chip morphology are collected and analyzed carefully. The size effect is discovered by the phenomena of the existence of oscillations and relaxations in cutting force and hyper-proportional increase of specific cutting force, when the ratio of feed per tooth to cutting edge radius ft/re is less than 1. While the brittle cutting mode is detected through the existence of sharp fluctuations in cutting force and cracks on the groove base when the ratio ft/re is larger than 2. From the further comprehensive analysis of cutting force, specific cutting force, machined groove base quality and chip morphology, the cutting parameters with ratios of the maximum undeformed chip thickness in one cutting circle to cutting edge radius hmax/re around 0.14, 0.2 and 0.4 are regarded as size effect, optimal and brittle cutting points, respectively. The size effect, ductile cutting and brittle cutting zones are divided by the size effect and brittle cutting boundaries (points). Among the optimal points, the depth of cut of 2 μm with the ratio ft/re of 1 is the optimal cutting parameter for micro ball end-milling of KDP crystal. 相似文献
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A slip-line field model for orthogonal cutting with a tool containing a groove-like feature on its rake face is proposed. Primary contact at the tool-chip interface is taken to be plastic. Based on experimental observations, it is assumed that the chip flows into the groove, and is forced to curl by Coulomb friction contact with the groove back wall. Solutions obtained for different groove geometries, groove positions relative to the cutting edge, rake angles and tool-chip interface friction using the matrix operator method are presented and discussed. The calculated results are in general agreement with experimental observations. It is found that the model can be formulated so that it can be used to predict the cutting geometry for obstruction-type chip breakers as well. 相似文献