深冷处理对硬质合金刀具耐磨性影响的研究

对YT15硬质合金数控车刀进行了深冷处理正交实验,通过对深冷处理和未经深冷处理车刀耐磨性能、硬度、晶格常数的考察,并用极差分析法对实验数据进行处理,找出了影响YT15硬质合金刀具耐磨性的深冷处理工艺的关键因素.     

CrAlN纳米梯度涂层的切削性能研究

针对45#钢进行切削,以YT15车刀为对比,研究了CrAlN纳米梯度涂层的切削性能,利用Fluke Ti X640型热成像仪测试了切削过程中切削区的切削温度,采用超景深三维显微镜观察了刀具的磨痕形貌。结果表明:CrAlN纳米梯度涂层刀具具有更低的切削温度,使用寿命比YT15车刀使用寿命约延长了1.5倍。刀具磨损失效以磨料磨损为主。     

高速精挑梯形螺纹

我组以前精挑丝杠时,采用豆油润滑高速钢车刀挑扣,效率很低,一个熟练的工人,每班只能加工七、八根。为此,我们经过多次试验,终于试验成功硬质合金高速精挑扣车刀。这种车刀七分钟可精加工一根丝杠,效率提高10倍。现介绍如下:刀具结构:刀具的上平面与两侧面交接处磨成圆弧形(见图),并用油石磨光。为了增加刀头强度,刀头不开断屑槽,刀头材料为YT 15。     

YT15硬质合金刀片深冷处理工艺实验研究

采用正交试验法对YT15硬质合金车刀刀片深冷处理工艺进行了研究,分析了不同工艺参数对刀具性能的影响,并使用扫描电子显微镜(SEM)观察了深冷处理前后的刀具磨损情况.结果表明,深冷温度对刀片性能影响最大,其次是冷却速度,再次是回火温度.深冷处理促使硬质合金的粘结相Co发生了多性型马氏体转变,从而提高了刀具的硬度和耐磨性.     

微量切削精车刀

在轴,套零件的外圆车削中,常常会遇到精车后零件的加工余量还剩0.01—0.02毫米,这时再用普通外圆精车刀车削是较困难的,若用砂布打、或锉刀锉则会使零件的几何精度超差,为此,我们没计制造了微量切削精车刀。 焊有YT15或YT30硬质合金刀片的刀头与刀体采用滑配合,由螺栓固紧。刀体与开有3毫米宽通槽的方套采用滑配合并装在刀架上,其特点是: 1.主后角和前角、刃倾角和副后角、主偏角和副偏角均可调节,主后角和前角由转动刀体来调节;刃倾角和副后角由转动刀头来调节;主偏     

离子注入对车刀耐磨性的影响

本文介绍用能量为100kev,剂量为5×10~(17)/cm~2。的氮离子注入到硬质合金(YT14和YG8)和高速钢(W18Cr4V)车刀刀片。在车床上进行工艺试验,检查注入工艺对车刀耐磨性的影响。结果认为,离子注入时车刀耐磨性未能达到改善的预期效果。     

先进刀具在普通车床的应用

通过利用C6132A普通车床加工20CrMnTi锻件,从使用传统的硬质合金YT15焊接车刀到更改用先进的机夹不重磨车刀和先进的涂层刀具,可使普通车床上加工零件的精度和加工效率明显提高,使先进刀具性能得到了较高的应用,有利于零件的批量生产加工,体现出较好的经济效益。     

冷处理对GCr15钢的性能和尺寸稳定性的影响

本文着重研究了冷处理温度、时间和次数对消除GCr15钢残留奥氏体的作用及其对硬度、弯曲强度、冲击韧性和尺寸稳定性的影响。试验结果指出:冷处理对硬度、弯曲强度和冲击韧性等力学性能影响不大;降低冷处理温度,对于消除残留奥氏体和提高尺寸稳定性的效果很明显。冷处理时间的作用不如温度的作用大;在选定的冷处理温度下,以一次较长时间的冷处理对消除残留奥氏体和提高尺寸稳定性较好。附图12幅,表12个,参考文献8篇。     

纳米TiN改性TiC基金属陶瓷可转位刀片研究

阐述了用纳米TiN改性对TiC基金属陶瓷力学性能的影响，用自行研制的纳米TiN改性的TiC基金属陶瓷可转位刀片与YT15、YT8及未改性的TiC基金属陶瓷刀片进行了对比性的切削试验。结果表明纳米TiN改性的TiC基金属陶瓷刀片具有优良的综合切削性能，生产应用具有广阔的前景。     

45°、90°可换位正反机夹式粗车精车多用车刀

<正>在机夹式车刀应用中45°、90°左右车刀应用泛围广、通常采用一杆一刀方式.要实现以上操作要准备四把车刀.采用45°、90°可换位,正反机夹式粗,精车多用车刀可以在一把刀体上完成多种工序,多用车刀结构如图所示.该多用车刀的特点为:在一把刀体上可正反两面装夹刀片,每一块刀片又可在45°和90°两个位置上变换角度,组成左、右45°、90°四种不同用途的车刀对零件粗车或精车.也可根据加工材料选用YT15或YG8硬质合金.由于正反面均可装夹,即可作左车刀又可用于右车刀,实现一刀多用.该车刀结构简单装卸方便,安装牢固,使用寿命长.刀体采用45号钢加工、HRC40——45发兰处理.刀片精磨后在C618、C616车床上加工45号钢轴类零件时,车速n=610转/分,进给量C=0.25mm/转,切削深度t=0.1—4mm,效果良好.     

深冷处理对W18Cr4V铣刀片性能的影响

以W18Cr4V高速钢铣刀片为研究对象,通过对比试验,分析了经多次深冷处理后铣刀片的组织转变特性和力学性能.研究结果表明,与一次长时间深冷处理相比,多次短时间深冷处理对于提高W18Cr4V铣刀片的力学性能效果更佳.     

改善Crl2MoV钢综合力学性能的工艺分析

对Crl2MoV钢在淬火后采用深冷处理和中低温回火相结合处理工艺,通过显微组织及硬度、冲击功和抗弯强度等力学性能测试,研究了深冷处理对Crl2MoV钢组织和性能的影响,结果表明：1020℃30nlin油淬＋200℃回火1h＋深冷处理＋400℃回火2h工艺处理,具有较好的综合力学性能。     

热处理对21-6-9钢性能及显微组织影响

热处理工艺对单相高强度21-6-9奥氏体不锈钢显微组织及力学性能影响显著。本文在固定其他热处理工艺参数情况下,分别对固溶处理温度,固溶冷却方式,时效处理温度进行研究,结果表明:固溶温度对21-6-9钢低温韧性及晶粒尺寸影响显著,1050℃是其最佳固溶处理温度;固溶冷却方式对其力学性能影响不明显,但对其晶粒尺寸有较大影响,其中水冷处理方式能够使21-6-9钢得到尺寸均匀且细小的晶粒组织;时效温度对其低温韧性存在影响,表现为时效温度过高(≥600℃)会导致低温韧性明显下降。经过适当的热处理工艺处理,实现21-6-9钢屈服强度不低于438MPa,断口伸长率47%,断口收缩率不低于75%,同时具有良好的塑性及低温韧性。     

Metallurgical principles of cryogenically treated tool steels��a review on the current state of science

The cryogenic treatment of tool steels has transformed over centuries from black art to science, but the metallurgical principles responsible for increase in wear resistance, tensile strength, toughness, and stability are still disputed. Metallurgists comprehend how tool steels respond to cryogenic treatment, but they also understand that for many years, the cryogenic treatment of tool steels had the reputation of being a quick fix for poor heat treatment practice. During the cryogenic treatment of tool steels, the process modifies the carbon present in the tool steels. However, cryogenic treatment has not been widely adopted by the cutting tools industry due to lack of understanding of the fundamental metallurgical mechanisms and due to the wide variation in reported research findings. In the present paper, an attempt has been made to review the literature on metallurgical changes that occurred during the cryogenic treatment of tool steels to benefit the cutting tools industry. The prominent reasons found to be responsible for improving the mechanical properties of tool steels are transformation of retained austenite to martensite and precipitation of fine carbides.     

Metallurgical and mechanical characteristics of cryogenically treated tungsten carbide (WC–Co)

This paper aims to present the metallurgical and mechanical characterization of cryogenically treated tungsten carbide (WC–Co) in terms of α-, β-, γ-, and η-phase particles and wear behavior, respectively. The specimens of commercially available uncoated WC–Co in the form of round turning inserts were procured and subjected to cryogenic treatment at two levels ?110°C (shallow treatment) and ?196°C (deep treatment) of temperature. The microstructures obtained after cryogenic treatments have been characterized with a prominence to comprehend the influence of cryogenic treatment on the nature, size, and distribution of α-, β-, γ-, and η-phase particles as compared to untreated specimen. The mechanical properties such as hardness and wear rate of the specimens have also been compared by performing Rockwell A hardness test and pin-on-disk wear test, respectively. Microstructures, hardness, wear rate, and analysis of worn surface divulge the underlying metallurgical mechanism responsible in improving mechanical properties of the WC–Co.     

深冷处理对三角材质Cr12MoV钢性能的影响

对淬火后的Cr12MoV钢采用不同时间深冷处理,经回火处理后,对其进行金相组织分析和力学性能测试。试验结果表明,1 050℃淬火＋550℃回火后,Cr12MoV钢的冲击功可达4.5J,淬火后的深冷处理时间〉4h后细化晶相的效果明显,超过12h的深冷处理可将Cr12MoV钢的硬度提升至65.5HRC,耐连续磨损性能提高2倍,可以有效改进三角的使用工况并延长使用寿命。     

超低温处理改善高速钢刀具性能及机理研究

对高速钢冷挤压冲头和麻花钻作了超低温处理，并应用于生产实践。结果表明，超低温处理显著提高了刀具的使用寿命，通过性能试验和金相组织分析探讨了超低温处理的作用机理。     

The effects of cryogenic treatment on the toughness and tribological behaviors of eutectoid steel

Cryogenic treatment is a supplementary heat treatment usually applied after quenching. Its effects are permanent and this process affects the entire section. There have been many studies related to cryogenic treatment, most of which have been focused on tool steels. In the current study, a high-speed-train railway material was investigated, and different heat treatment processes were applied to the eutectoid steel. The effects of quenching and cryogenic treatment were investigated on the mechanical properties (toughness, hardness and wear). Four different structures were obtained with different heat treatment cycles: Pearlitic, tempered martensite, 12 hour cryo-treated tempered and 36 hour cryo-treated tempered. As a result of Charpy v-notch tests and hardness tests, cryogenic treatment was found to improve the toughness and hardness of quenched samples. The results of the ball-on-disc wear tests showed that the cryo-treated samples have better wear resistance than pearlitic and martensitic samples.     

9Cr2Mo轧辊热处理试验研究

通过对9Cr2Mo轧辊进行退火、调质、淬火、回火、深冷处理、二次低温回火等热处理后,能够显著提高轧辊的综合力学性能和使用寿命,有效保证轧辊的表面粗糙度等外观质量,大大降低轧辊的生产成本,提高轧机生产效率,增加经济效益。     

深冷处理的铝合金点焊电极寿命研究

为了提高铝合金点焊电极寿命,提出了点焊电极的深冷处理方法。采用不同深冷处理工艺参数加工了点焊电极,用这些电极进行了铝合金点焊电极寿命试验,比较了深冷处理电极与未深冷处理电极寿命,观测、比较了深冷处理前后点焊电极端面、焊点表面的宏观形貌,观察了深冷处理电极与未深冷处理电极微观组织,测试了深冷处理电极与未深冷处理电极物理性能。试验结果表明:深冷处理改变了电极微观组织,改善了电极导电、导热性能,提高了点焊电极寿命,使电极寿命由原来的620点提高到2 145点。