45钢/W8Co3N高速钢刀具的摩擦焊接研究

对 45钢 /W8Co3N高速钢刀具的摩擦焊接工艺及焊接效果进行了试验研究 ,结果表明 ,采用优化的摩擦焊接工艺参数及合理的焊后热处理工艺可获得具有良好显微组织和力学性能的焊接接头。     

300M钢材料热处理后转接R加工烧伤控制

针对空客起落架300M钢零件热处理后,转接R处的切削加工烧伤控制问题,通过对该材料热处理后切削加工特性的分析,利用机床备件平旋盘,从刀具结构和加工工艺方法、工艺参数方面进行了深入研究。经过切削加工试验和酸蚀检查验证,使加工后的零件烧伤得到了有效控制。     

M35钢齿轮刀具的热处理工艺改进

通过对M 35钢的热处理工艺试验研究,制定出符合齿轮刀具的热处理工艺,再通过对M 35钢阶梯式回火的试验与分析,总结出不同回火方式下硬度的变化规律,从而更有效地应用于生产。     

H10Cr4Mo4Ni4V钢轴承零件热处理工艺研究

通过选取不同的渗碳热处理工艺参数对H10Cr4Mo4Ni4V钢轴承零件进行工艺试验研究，优化了高温渗碳钢热处理工艺，保证了热处理质量。     

Cr4Mo4V钢热处理工艺对残余奥氏体量的影响

经对Cr4Mo4V钢进行热处理工艺试验，分析工艺参数对残余奥氏体量的影响，优化了热处理工艺参数，使Cr4Mo4V钢残余奥氏体量控制在5％以内，保证了热处理质量及尺寸稳定性。     

ZGCr15钢的热处理工艺试验研究

对ZGCr15钢进行热处理工艺试验，分析了工艺参数对残余奥氏体量的影响，优选了热处理工艺，使ZGCr15钢残余奥氏体量控制在5％以内，保证了热处理质量及尺寸稳定性。     

M2Si高性能高速钢热处理工艺研究

本文对新型的无Co超硬高速钢的热处理工艺进行了探索，得到了最佳热处理工艺参数，并在齿轮切削刀具上进行了加工试验。试验结果表明，耐用度在通用高速钢的基础上提高了50%以上。     

锯片铣刀的热处理工艺及其寿命的实验研究

本文对“M2”高速钢板制造的锯片铣刀所作的热处理工艺试验、红硬性试验和刀具寿命试验进行了分析。经试验分析得出,热处理工艺采用1230℃淬火,560℃三次回火,刀具硬度、奥氏体晶粒度、红硬性均在合格范围内,采用此种热处理工艺刀具使用寿命最佳。     

高性能高速钢新材料HYTV3和DF8Co3热工工艺及机械性能试验

用HYT3钢和DF8Co3钢以及TM2钢投产机用丝锥,并与常用普通M2钢机用丝锥进行对比,通过不同热处理工艺参数试验,并结合冲击、抗弯试验,确定四个钢种的最佳热处理工艺和四个钢种的机用丝锥采用最佳热处理工艺下的使用寿命。结果显示HYTV3钢机用丝锥使用寿命长,适合投产机用丝锥。     

超高强度钢切削研究

超高强度钢切削加工中存在切削加工性差、切削变形大、加工硬化严重、切削力大、切削温度高、刀具磨损严重、加工质量难以控制等问题,就此,对超高强度钢的切削进行了研究.从热处理及显微组织、刀具材料及几何参数、切削用量等方面论述了超高强度钢切削加工的影响因素,介绍了超高强度钢的切削机理及工艺参数优化问题,提出了当前超高强度钢切削研究中遇到的主要问题,并指出了未来超高强度钢切削加工技术的发展方向.     

基于切削力的PVD涂层刀具性能研究

本文在干式切削条件下,选用钴基硬质合金无涂层数控刀具和钴基硬质合金基体TiAlSiN与TiAlN/Ta涂层数控刀具,分别切削淬火态45钢(52HRC);车削时,采用SW-1车刀空间受力分析仪测量刀具在车削状态下的三向力;结合对被加工件的表面粗糙度测定,探讨TiAlSiN、TiAlN/Ta涂层刀具在相同条件下的三向力、摩擦力和摩擦系数与无涂层钴基硬质合金刀具的差异。结果表明,在车削高硬度材料时,涂层及其成分对车刀三向力和摩擦系数均有较大影响,TiAlN体系中加入稀土元素Ta形成的TiAlN/Ta多层涂层刀具的三向力、摩擦系数明显小于TiAlSiN涂层刀具,而且被加工件的表面粗糙度更小。     

Selection of optimum tool geometry and cutting conditions using a surface roughness prediction model for end milling

Influence of tool geometry on the quality of surface produced is well known and hence any attempt to assess the performance of end milling should include the tool geometry. In the present work, experimental studies have been conducted to see the effect of tool geometry (radial rake angle and nose radius) and cutting conditions (cutting speed and feed rate) on the machining performance during end milling of medium carbon steel. The first and second order mathematical models, in terms of machining parameters, were developed for surface roughness prediction using response surface methodology (RSM) on the basis of experimental results. The model selected for optimization has been validated with the Chi square test. The significance of these parameters on surface roughness has been established with analysis of variance. An attempt has also been made to optimize the surface roughness prediction model using genetic algorithms (GA). The GA program gives minimum values of surface roughness and their respective optimal conditions.     

Cost optimization for the cutting a cobalt chrome refractory material

This paper shows a complete approach to solve a given problem, from the experimentation to the optimization of different cutting parameters. To solve an industrial problem of slotting CoCr29Ni10W7, a Cobalt-based refractory material, we have implemented a design of experiment to determine the effect of cutting parameters on tool life, surface roughness, and cutting forces. After theses trials, an optimization approach has been implemented to find the lowest manufacturing cost while respecting the roughness constraints and cutting force limitation constraints. The optimization approach is based on the Response Surface Method using the Sequential Quadratic programming algorithm and Kriging interpolation for a constrained problem.     

异型螺杆铣削过程刀具磨损状态检测研究

针对异型螺杆铣削加工，采用振动信号特征值作为检测刀具磨损的参量。利用小波分析构建滤波器组，对振动信号进行多尺度分解和多分辨率逼近，提取出刀具磨损特征信号。特征信号处理结果反映了刀具磨损变化规律，振动幅值大小反映了刀具磨损状况，从而实现了刀具磨损状态在线实时检测。     

用广义最小二乘法建立机床动力学模型

本文探讨了用广义最小二乘法直接辨识机床动力学物理参数的建模方法,并在相对激振试验的基础上,辨识了M131W外圆磨床动力学模型的物理参数,进而建立了该机床的动力学模型,并通过模态分析检验了所建立的动力学模型对实际机床的模拟效果。     

High temperature tribological behaviour of tool steels during sliding against aluminium

Soldering and abrasive wear of die-casting tools are some of the biggest problems facing the aluminium die-casting industry. The understanding of the tribological behaviour is crucial to design new tool steels and tool steel-coating systems. The present study aims at investigating aluminium adhesion of aluminium/tool steel pair, performing sliding tests at high temperature with ball-on-disc configuration to reproduce solid/solid interaction. Different test conditions have been conducted in order to select the optimal test parameters to obtain aluminium adhesion on disc surface. Once the lab test has been designed, the high temperature tribological performance of different hot work tool steels (uncoated and coated by PVD) sliding against aluminium has been studied to allow proper die material design and selection.     

Experimental and theoretical evaluations of thermal histories and residual stresses in dissimilar friction stir welding of AA5086-AA6061

Nanofluids for grinding process are prepared by mixing the multiwall carbon nanotubes with SAE20W40 oil. In this experimental study, the surface roughness and micro cracks are analysed. The material AISI D3 tool steel is most frequently use for mould and dies which is preferred to analyse the surface characteristics. Experimental results indicate that the surface finish of the machined work piece increases from micro level to nano level. L8 orthogonal array was used to optimize the machining parameters in Taguchi design of experiment technique using Minitab 15 software. Empirical model for the prediction of output parameters has been developed using regression analysis and the results are compared empirically for with and without nanofluids in grinding process. The analysis of variance and F test were used to determine the significant parameter affecting the surface roughness. Atomic force microscopy analysis indicated that carbon nanotube mixed with nanofluid in grinding process has improved the surface characteristics like surface roughness and micro cracks.     

加工气门座及气门导杆孔精密复合刀具的设计

提出了气缸盖座圈锥孔与气门导杆孔加工的新工艺，设计了座圈锥孔与气门导杆孔加工的新型复合刀具的具体结构，并对铬钼镍粉末冶金气门座圈进行了刀具耐用度实验以确定合适的刀具材料。     

A representative ex-situ fretting wear investigation of orthodontic arch-wire/bracket contacts

Recent studies show that resistance to friction and wear between the arch-wire and the bracket are of great importance for the quality of orthodontal treatment. To optimize these phenomena specific surface treatments have been developed, but a major difficulty is the methodology for comparing and improving the given palliatives. A specific ex-situ fretting test has been developed which permits the micro-slidings generated by the occlusion movements to be superimposed on macro-slidings generated by the teeth displacement.In this study the friction force between brackets and arch-wires during combined macro-/micro-slidings has been investigated. Various stainless steel bracket/arch-wire contacts have been analyzed. The wear and friction properties of different PEPVD deposited coatings such as SiC and SiN have been studied under dry and wet artificial saliva conditions.     

基于绿色制造的干式切削钻头前角优化设计

基于十切削机理和下切削用钻头的设计理论,采用Pro／E建模技术对钻头结构进行了参数化建模;利用ANSYS软件,就钻头前角对钻头最大应力和最大变形的影响进行了单因素的有限元数值计算和对比分析,并以提高刀具强度、刚度快速排屑为目标,进行了参数优化。