共查询到19条相似文献,搜索用时 171 毫秒
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通过切削试验,研究了硬质合金刀具加工耐磨铸铁MT-4时刀具的磨损形态及磨损机理。对刀具磨损区微观形貌的检测分析结果表明:硬质合金刀具的磨损形态主要表现为前刀面磨损和后刀面磨损,造成刀具磨损的主要原因是粘结磨损和扩散、氧化磨损。 相似文献
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利用涂层硬质合金刀具对Inconel 718进行了高速干切削试验,采用扫描电子显微镜SEM和能量分散光谱EDS扫描,对不同切削参数下刀具的损坏形态和损坏机理进行了研究。分析结果表明刀具损坏形式主要有前刀面磨损、后刀面磨损、剥落和崩刃。刀具损坏机理主要是粘结磨损、磨粒磨损、氧化磨损和扩散磨损等。 相似文献
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PCD刀具切削颗粒增强铝基复合材料时刀具磨损研究 总被引:2,自引:1,他引:1
通过高颗粒含量铝基复合材料切削加工时PCD刀具的磨损试验,研究了切削该种材料时PCD刀具的磨损形态及磨损机理。刀具磨损区微观形貌的检测分析结果表明,PCD刀具的磨损形态主要表现为前刀面磨损和后刀面磨损,造成刀具磨损的主要原因是磨料磨损和粘结磨损。采用超声波振动切削技术可减小刀具磨损。 相似文献
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为研究陶瓷刀具切削钛合金的磨损机理,采用CC6060陶瓷刀片对TC4钛合金进行了干式车削试验。结果表明:陶瓷刀具干式切削TC4钛合金时,磨损形貌以前刀面月牙洼磨损、后刀面沟槽磨损和刀尖破损为主,磨损机理主要是粘结磨损和氧化磨损。随着切削速度的增加,刀具磨损加剧,刀具寿命降低。CC6060陶瓷刀片干式切削钛合金时的使用寿命很低,不适于干式切削钛合金。 相似文献
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采用不同刀尖圆弧半径的涂层硬质合金刀片对Ti_2AlNb金属间化合物材料进行车削试验研究,用扫描电子显微镜SEM观察刀片磨损形貌,通过能量分散光谱EDS分析刀片表面的元素分布及含量,并对刀片磨损形态和失效原因进行分析。研究结果表明:切削Ti_2AlNb过程中,涂层硬质合金刀片磨损形态为前刀面磨损、后刀面磨损、沟槽磨损和崩刃以及涂层剥落等;增大刀尖圆角有利于提高刀片寿命,并且小刀尖半径硬质合金刀片以沟槽磨损为主,大刀尖半径硬质合金刀片以后刀面磨损为主;沟槽磨损主要原因是粘结磨损、氧化磨损、扩散磨损以及疲劳破坏;沟槽磨损初期以粘结磨损、氧化磨损为主,中后期以扩散磨损以及疲劳破坏为主;后刀面磨损主要原因是磨粒磨损和粘结磨损。 相似文献
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通过对钛合金TC4、TC11和Ti-5553的切削试验,对比分析Ti-5553加工过程中切削速度对切削力和刀具磨损的影响。试验结果表明:随着切削速度增大,切削钛合金TC4和TC11的切削力呈现不同程度的先增后减趋势,而钛合金Ti-5553的切削力呈缓慢增大的趋势;在相同切削速度下,Ti-5553的主切削力和吃刀抗力均高于TC4和TC11;通过超景深、扫描电镜和能谱分析仪对刀具磨损部位进行观察与分析发现,切削Ti-5553的刀具磨损量最大,随着切削速度的增大,刀具的后刀面磨损量增加,刀具主要磨损形式为粘结磨损,刀具后刀面出现沟槽磨损,刀具出现破损。 相似文献
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针对AISI 4340合金结构钢难加工的特点,选用PVD硬质合金涂层刀具进行高速干铣削试验,选用扫描电子显微镜(SEM)观察失效刀具表面的磨损形貌特征,选用能谱分析仪(EDS)分析磨损刀具表面的元素分布及含量,揭示刀具的磨损机理。研究结果表明:刀具寿命与切削参数选取有关,随着切削速度的增加,刀具磨损加快,刀具寿命降低。硬质合金涂层刀具的主要磨损形式是前刀面磨损和后刀面磨损,前刀面磨损机理主要是粘结磨损、涂层剥落、切削刃微崩刃;后刀面磨损机理主要是磨粒磨损、粘结磨损、扩散磨损、微裂纹。 相似文献
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For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Many researches on diamond tool wear in glass cutting rest on wear phenomenon describing simply without analyzing the genesis of wear phenomenon and interpreting the formation process of tool wear in mechanics. For in depth understanding of the tool wear and its effect on surface roughness in diamond cutting of glass, experiments of diamond turning with cutting distance increasing gradually are carried out on soda-lime glass. The wear morphology of rake face and flank face, the corresponding surface features of workpiece and the surface roughness, and the material compositions of flank wear area are detected. Experimental results indicate that the flank wear is predominant in diamond cutting glass and the flank wear land is characterized by micro-grooves, some smooth crater on the rake face is also seen. The surface roughness begins to increase rapidly, when the cutting mode changes from ductile to brittle for the aggravation of tool wear with the cutting distance over 150 m. The main mechanisms of inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear. The proposed research makes analysis and research from wear mechanism on the tool wear and its effect on surface roughness in diamond cutting of glass, and provides theoretical basis for minimizing the tool wear in diamond cutting brittle materials, such as optical glass. 相似文献
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钛合金铣削过程刀具前刀面磨损解析建模 总被引:1,自引:1,他引:0
钛合金Ti6Al4V作为典型的航空航天难加工材料,在其铣削过程中硬质合金刀具的磨损会降低加工过程稳定性,进而影响加工效率和已加工表面表面质量。刀具前刀面磨损会导致刀具刃口强度降低,并影响切屑的流向和折断情况。针对前刀面磨损机理进行分析并构建了月牙洼磨损深度预测模型。首先运用解析方法构建了前刀面应力场模型,得到切屑在前刀面滑动过程中的刀具前刀面应力分布情况及磨损位置。基于刀-屑接触关系的基础上建立了前刀面温度场模型。然后,基于所得刀具前刀面应力与温度分布,构建综合考虑磨粒磨损、粘结磨损与扩散磨损的铣刀月牙洼磨损深度预测模型,获得月牙洼磨损预测曲线;结合铣刀月牙洼磨损带沿切削刃方向分布的特点,建立了随时间变化的铣刀前刀面磨损体积预测模型。最后通过试验验证了切削宽度对前刀面磨损的影响规律,预测结果与试验测量值具有较好的吻合性。结果表明随着切削宽度的增加,月牙洼磨损深度及前刀面磨损体积都随之增加。研究结果为钛合金铣削用刀具的设计和切削参数的合理选择提供了理论基础。 相似文献
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Waseem AKHTAR Jianfei SUN Pengfei SUN Wuyi CHEN Zawar SALEEM 《Frontiers of Mechanical Engineering》2014,9(2):106-119
Nickel based super-alloys are widely employed in aircraft engines and gas turbines due to their high temperature strength, corrosion resistance and, excellent thermal fatigue properties. Conversely, these alloys are very difficult to machine and cause rapid wear of the cutting tool, frequent tool changes are thus required resulting in low economy of the machining process. This study provides a detailed review of the tool wear mechanism in the machining of nickel based super-alloys. Typical tool wear mechanisms found by different researchers are analyzed in order to find out the most prevalent wear mechanism affecting the tool life. The review of existing works has revealed interesting findings about the tool wear mechanisms in the machining of these alloys. Adhesion wear is found to be the main phenomenon leading to the cutting tool wear in this study. 相似文献
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