冷冲高硬度材料模具失效的原因与对策研究

在日常的应用中,我们发现,制作材料是高合金钢的模具要比硬质合金制作的模具耐用,我们进而研究了其失效的方式以及失效的比例,研究结果显示,硬质合金的失效主要体现在掉渣和崩刃,而高合金钢的失效主要体现在正常的磨损方面。在制作的过程中,高合金钢会由于在加热的不适当而使得碳化物不均匀,或者使得硬度不稳定等原因而没有充分发挥材料的潜在能力,文章对如何提高高合金钢的寿命提出了具体方案。     

整体硬质合金螺旋木工铣刀的合理选用

从刀具旋向特点、加工方式、切削参数以及刀具磨损等方面介绍整体硬质合金螺旋木工铣刀的应用和选择。     

木工刀具硬质合金应用现状和发展趋势

介绍了木材切削加工用硬质合金刀具材料的性能以及研究和应用现状,重点阐述了涂层硬质合金的研究成果和应用领域。结合木材和木质复合材料切削加工特点,探讨硬质合金木工刀具在木材加工工业中应用的可行性。     

试论金属切削刀具涂层

本文简要介绍了现代金属切削刀具的重涂技术的产生、技术特点及应用。     

高速钻削复合材料的切削力

采用多种硬质合金钻头,在高转速和不同进给速度条件下对碳纤维/环氧树脂复合材料进行孔加工正交试验,通过研究其轴向力和扭矩以分析刀具条件和切削参数的适应性.结果表明:主轴转速是影响轴向力和扭矩的最主要因素,高转速钻削时轴向力和扭矩都显著减小;减小进给速度也使轴向力和扭矩减小,但其影响小于主轴转速.此外,钻头材质对轴向力和扭矩的影响大于钻头几何形状和进给速度;进给速度对轴向力的影响较大,而钻头几何形状对扭矩的影响较大.     

亚温处理中锰钢碳化物粒化机制

In this paper, with observing a great deal of experimental results, the kinetics laws of the transformatins of the carbides for the medium-Mn Steels at the intercritical heat treatment have been studied and analysed, and the hypothesis of the grained mech     

镍－碳化硅复合电镀的研究

报道了瓦特型镍－碳化硅复合电沉积过程，研究了ＳｉＣ微粒的表面活性剂处理，粒子浓度阴极电流密度，搅拌和ｐＨ值等因素对镀层硬度和耐磨性的影响。结果表明，在最佳的工艺条件下，可制备出性能优良的复合镀层（９％～１０％ＳｉＣ含量）其硬度是纯Ｎｉ的４～５倍，耐磨性是纯Ｎｉ的５～６倍。     

硝化抑制剂乙炔的应用研究进展

主要论述了乙炔作为硝化抑制剂的作用机理、研究进展;介绍了乙炔的硝化、反硝化抑制作用,对温室气体(N2O等)排放的抑制作用及与其他抑制剂的协同作用;对乙炔目前的研究现状和有待解决的问题及可行的研究方向也进行了系统分析,并指出了其市场化应用的有利因素和限制因素。     

硅熔体中碳化硅熔解与硅晶体中碳化硅生长

工业生产的太阳能电池用多晶硅锭内部常出现碳化硅夹杂,影响太阳能电池的转换效率,特别是严重威胁硅片的切割生产过程。本文研究了硅熔体中碳化硅熔解与硅晶体中碳化硅沉淀生长特性。在熔解实验中发现：即使在碳显著过饱和的情况下,碳化硅仍会熔解在1450℃的硅熔体中,同时熔体中易形核处发生新的碳化硅颗粒析出。在1350℃下进行了硅料中碳化硅沉淀的固相生长实验,结果表明晶体硅中碳化硅沉淀的高温固态生长十分缓慢。这一特性得到理论计算证实,它表明固相生长不可能是多晶硅锭中出现大颗粒碳化硅的原因。     

Performance of coated carbide tools when grooving wood-based materials: effect of work materials and coating materials on the wear resistance of coated carbide tools

This paper presents the performance of coated carbide tools when grooving various density hardboards and wood-chip cement boards. Work materials of low density (about 0.8g/cm³) and high density (about 1.2g/cm³) were tested. The coating materials studied were chromium carbide, titanium carbonitride, and titanium carbide, which were synthesized on P30 carbide substrate using a chemical vapor deposition method; titanium nitride, chromium nitride, and titanium carbonitride were synthesized using the physical vapor deposition method. Cutting tests were performed during grooving at a cutting speed of 1000m/min and a feed rate of 0.1 mm/rev. The results of the study show that the coated carbide tools are more advantageous in reducing the progression of tool wear and retaining lower normal force and noise level when cutting both hardboard and wood-chip cement board of high density than was the uncoated carbide tool. The wear rate of the coated carbide tools for the wood-chip cement board increased more rapidly than that of the hardboard with increasing densities. Though the coated carbide tools suffered more wear with the low-density wood-chip cement board than with hardboard, their normal force and noise level were always lower for the low-density wood-chip cement board.Part of this paper was presented at the 11th Annual Meeting of the Chugoku Shikoku branch of the Japan Wood Research Society, Matsue, Shimane, September 25, 1999