共查询到16条相似文献,搜索用时 62 毫秒
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本文介绍了这种刀具的性能要求、材料选择和制作工艺。使用情况表明,所制两种刀具的寿命略高于和相当于同类进口刀具,但其价格仅为后者的1/4和1/10。 相似文献
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采用热常数仪和高温维氏硬度计对Co含量(质量分数)分别为6%和10%的硬质合金进行热学性能与高温力学性能检测,然后用以这2种硬质合金为基体的涂层刀片对镍基高温合金GH4133进行高速车削,采用扫描电镜(SEM)和能谱(EDS)对车削后刀片的磨损区域进行观察和成分分析,研究刀片基体的Co含量对刀具切削性能的影响。研究结果表明,硬质合金中的Co含量由10%降低到6%时,热导率由62.78(W.m)/K升高到84.57(W.m)/K,与此同时同一温度下的高温维氏硬度提高10%左右;YBG202刀片(基体中Co含量为10%)的切削刃与后刀面的磨损均较迅速,而YBG102(基体中的Co含量为6%)刀片后刀面的磨损相对均匀,磨损速率低;基体中的Co含量由10%降低到6%时,刀片的切削寿命提高约3倍。故高速连续切削镍基高温合金时应当尽量选用低Co硬质合金作为刀片的基体。 相似文献
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采用PCBN刀具对W-Ni-Fe合金进行高速精密切削试验,通过观测PCBN刀具前、后刀面的磨损形貌,分析了刀具的失效磨损机理;从CBN含量、刀具参数以及已加工表面粗糙度方面研究了PCBN刀具加工W-Ni-Fe合金的切削性能。结果表明,CBN含量高且刀尖圆弧半径大的PCBN刀具具有更长的使用寿命,在高速、低进给、小切深条件下可获得良好的表面质量。SEM和EDS分析结果表明,PCBN刀具高速精密切削W-Ni-Fe合金的磨损机理为粘结磨损、扩散磨损、局部剥落、氧化磨损以及崩刃磨损等多重磨损机理共同作用的结果。 相似文献
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黄永平 《稀有金属与硬质合金》1993,(3):59-60
山特维克是世界上最大的硬质合金生产公司,1991年其年销售额为49亿瑞典克朗,该公司硬质合金企业主要有山特维克可乐满公司、山特维克硬质材料公司和山特维克凿岩工具公司,他们的销售额占总公司的52%。 山特维克自1942年推出硬质合金刀具以来,在金属切削刀具技术方面一直处于领先地位。1958年该公司将可转位刀片技术传入 相似文献
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AF1410超高强度钢硬质合金加工刀具的磨损机理 总被引:1,自引:0,他引:1
AF1410超高强度钢是具有难加工特性的新型结构材料,通过设计正交实验,研究涂层硬质合金刀具切削AF1410超高强度钢的切削力和刀具寿命,分析达到磨钝标准的硬质合金刀具前、后刃面的磨损形貌,以及刀具磨损机理。结果表明,刀具寿命随铣削深度和铣削速度增大而线性减小,随着每齿进给量和铣削宽度增加,刀具寿命下降趋势逐渐放缓甚至略有增加。刀具磨损分为3个阶段:磨合阶段—稳定磨损期—快速磨损阶段,在快速磨损阶段刀具磨损迅速增加,直到刀具失效。前、后刃面均发生刀具材料的严重剥离,同时粘结大量AF1410钢屑。刀具涂层失效的主要机理为磨粒磨损,刀具基体主要失效机理为扩散磨损和粘结磨损。 相似文献
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本文研究了三种组分相同的(84(重量)%W、15(重量)%Co、(重量)%VC,但晶粒度(纳米、亚微米、微米)不同的WC-Co粉末。三种粉末均采用两种方法在盯同条件下烧结:常规真空烧结法和膨胀仪烧结法。测定了常规烧结制品的各种机械与物理性能,膨胀仪烧结试样的烧结机理。通过分析研究了不同温度下的收缩速率,研究发现粉末的初始晶粒度影响致密化的起始烧结温度、致密化速率、最终硬度和断裂韧性。 相似文献
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粉末冶金高速钢刀具共渗层的磨损及切削特性研究 总被引:1,自引:0,他引:1
研究了粉末冶金高速钢刀具经强化多元共渗后的磨损性能及切削特性。试验结果表明,经强化共渗的刀具切削力、摩擦系数降低,显微硬度和耐磨性提高,尤其在中速切削条件下,切削性能和耐磨性能改善更为显著。 相似文献
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张齐勋 《稀有金属与硬质合金》1995,(3):19-22
对采用烧结碳化新工艺制取的硬质合金刀片进行了切削试验,结果表明,该刀片在车削奥氏体不锈钢,球磨铸铁和冷硬铸铁时,其耐磨性较好,与常规工艺生产的YG6刀片相当。 相似文献
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Yu. G. Dorofeev V. I. Ustimenko A. V. Skorikov 《Powder Metallurgy and Metal Ceramics》1984,23(2):153-156
Conclusions The presence in powder metallurgy steels being machined of voids even in an insignificant quantity has a significant influence on the amount and character of wear of the cutting tool. Even a decrease in residual porosity to 0.5% provides a significant increase in cutter life.In connection with the fact that the character of wear of sintered carbide cutters in machining of low alloy powder metallurgy is primarily adhesive, VK8 cutters, which have higher cyclic impact strengths, have the best life.As tool materials in machining of powder metallurgy steels at cutting speeds of more than 200 m/min it is desirable to use mineral ceramic materials.Translated from Poroshkovaya Metallurgiya, No. 2(254), pp. 74–79, February, 1984. 相似文献
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Wear tests on SiC whisker- and SiC particulate-reinforced 6061-T6 aluminum matrix composites (SiCw/Al and SiCp/Al), fabricated
using a high pressure infiltration method, were performed in laboratory air, ion-exchanged water and a 3 pct NaCl aqueous
solution using a block-on-ring type apparatus. The effects of environment, applied load, and rotational (sliding) speed on
the wear prop-erties against a sintered alumina block were evaluated. Electrochemical measurements in ion-ex-changed water
and a 3 pct NaCl aqueous solution were also made under the same conditions as the wear tests. A comparison was made with the
properties of the matrix aluminum alloy 6061-T6. The SiC-reinforced composites exhibited better wear resistance compared with
the monolithic 6061 Al alloy even in a 3 pct NaCl aqueous solution. Increase in the wear resistance depended on the shape,
size, and volume fraction of the SiC reinforcement. Good correlation was obtained between corrosion resistance and corrosion
wear. The ratios of wear volume due to the corrosive effect to noncorrosive wear were 23 to 83 pct, depending on the wear
conditions. 相似文献
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The microstructure of one WC-Co and two Ti(C,N)-WC-Co cutting inserts has been studied before and after plastic deformation,
caused by high-speed turning. It was found that after deformation, the binder phase had infiltrated some of the grain boundaries
and formed lamellae between the hard phase grains. The infiltration of grain boundaries was assumed to occur by a stress-induced
dissolution along the grain boundaries of the hard phase grains as a wide front of binder phase, rather than gradually by
Co grain boundary diffusion. Some localized dissolution of the hard phase could also be seen as faceting of grains in WC-Co
and at triple points in cermets. It was concluded that the plastic deformation occurs by grain boundary infiltration with
simultaneous grain boundary sliding. The rate of deformation is controlled by grain boundary infiltration through dissolution
of the hard phase grains. 相似文献