金刚石锯轮的磨损形及对锯削力的影响

根据作者在国外进行的大量试验，探讨了金刚石锯轮花岗岩时的磨损形式及对锯削力变化规律的影响，并分析了影响磨损形式及磨削力的主要因素。     

石材锯切机理与金刚石工具磨损机理的研究现状

对金刚石工具切割石材等硬脆材料时的锯切机理、锯切过程中金刚石工具的磨损机理以及锯切力的国内外研究现状及各种观点进行了综合评述。由于石材等硬脆材料锯切过程的复杂性 ,对锯切机理的认识迄今尚不统一 ,对金刚石工具磨损机理和锯切力的理论研究也亟待深入。     

基于MSC.Marc锯切仿真的钢管锯切夹紧力研究

针对钢管锯切时夹紧力难以合理选择的问题,从钢管发生旋转等动作的源头锯切力进行了分析.根据钢管锯切特点,找出了钢管锯切最易发生移动、旋转的时刻.合理简化了锯切模型,利用有限元分析软件MSC.Marc仿真得到锯切力,为钢管锯切夹紧力的设定提供了理论依据.     

锯切花岗岩过程中金刚石框架锯的锯切力研究

锯切力是影响金刚石框架锯锯切板材质量的重要因素。本文通过对锯切机的运动学分析,研究锯条受载的变化情况与主要加工参数(进给速度v、参与锯切锯齿数n、和飞轮转速ω)对锯切力的影响机理,建立了最大锯切深度的计算模型。采用响应曲面法设计三因素三水平的金刚石框架锯锯切花岗岩试验,建立法向、水平锯切力关于主要加工参数的二阶预测模型,分析各因素对水平、法向锯切力的影响情况。通过ABAQUS有限元仿真软件对张紧后的锯条进行非线性屈曲分析,得到其临界屈曲载荷,进而得到在25个锯齿参与锯切条件下不发生临界屈曲的最优加工参数组合为进给速度v=62.94mm/h,飞轮转速ω=70r/min。     

新型金刚石节块圆片锯的切割性能试验

对一种新型金刚石节块圆片锯进行了切割性能对比试验 ,分析了工艺参数对径向锯切力的影响 ,建立了锯切力计算经验公式。     

高速锯切单晶硅的锯切力和锯缝崩边研究

探讨在单晶硅的高速精密锯切中,锯切用量与锯切崩边幅度大小之间的关系。通过使用金刚石薄锯片对单晶硅进行高速锯切,测量和分析不同参数下的锯切力,并结合锯切力比来分析金刚石锯片对单晶硅的锯切中力与崩边相互联系的特征。结果表明:在高速锯切单晶硅过程中,锯切深度、进给速度增大都能引起锯切力与力比的增大,也造成了单晶硅崩边情况更加严重。但是转速的提高则可以使锯切力大幅降低,并有效抑制加工过程中沟槽侧面的崩边问题。锯切深度与进给速度的增加引起锯切力增大时使单晶硅材料更加倾向于脆性断裂而被去除,但是提高转速降低锯切力后可使单晶硅渐转化为塑性去除,有效提高了加工产品质量。     

串珠绳锯切花岗石过程中锯切参数对锯切力和能耗的影响

在建立串珠绳锯切弧区内单颗磨粒平均切削深度与锯切参数间理论关系的基础上,采用单因素和正交法进行锯切参数对锯切力和锯切能耗影响的试验研究.结果表明,单颗磨粒平均切削深度与锯切长度无关,但随进给率的增大或线速度的减小而增大.进给率对锯切力和功率的影响比线速度和锯切长度都要明显.锯切过程中材料去除方式存在体积破碎,适当增大磨粒切削深度有利于提高体积破碎比例从而降低锯切比能;但增大磨粒切削深度直接缩小了介于工具一工件接触面问的动态容屑空间从而加剧岩屑摩阻效应,长弧区排屑困难对锯切力和能耗影响明显.正确选择锯切工艺参数尤其是进给率,对锯切力和能耗的控制及动态容屑空间的平衡至关重要.     

锯切条件对金刚石节块磨损的影响

在圆盘锯机上，用金刚石单刀块锯切花岗石，测量金刚石节块在不同加工工艺参数和不同冷却液条件下的磨损量，并观察节块的磨损状况。在实验的基础上，探讨锯切条件对金刚石节块磨损的影响原因。结果表明，金刚石节块的磨损量随着锯切工艺参数的改变而改变；与水冷相比，采用ＧＤ型润滑冷却液冷却能有效地降低节块的磨损量。     

双金属带锯条锯削和的计算

建立带锯条刀齿模型定义锯削力，推出锯削力计算的实验公式，确定公式中各参数的意义和计算或取值方法，由此计算出来的锯削抗力和实验结果非学吻合。     

锯切条件对金刚石节块磨损的影响

在圆盘锯机上，用金刚石单刀块锯切花岗石，测量金刚石节块在不同加工工艺参数和不同冷却液条件下的磨损显，并观察节块的磨损状况。在实验的基础上，探讨锯切条件对金刚石节块磨损的影响原因。结果表明，金刚石节块的磨损量随着锯切工艺参数的改变而改变；与水冷却相比，采用GD型润滑冷却液冷却能有效地降低节块的磨损量。     

金刚石串珠锯锯切工艺及磨损机理研究

在锯切试验基础上 ,研究了金刚石串珠锯锯切速度、进给速度与串珠绳磨损率、锯切力之间的关系 ,分析了金刚石串珠锯的磨损机理 ,并对实际锯切加工提出了建议。     

多丝切割技术及其关键

多丝切割是一种新型的硅片切片加工方法,具有切割表面质量高、切割效率高和可切割大尺寸材料、方便后续加工等特点。本文论述了多丝切割机的切割加工过程、切割加工机理,提出了加工中的几个要点。     

混凝土锯切加工过程的基本特征

通过金刚石单颗粒划伤、金刚石单个节块锯切和金刚石锯片锯切系列试验，对混凝土锯切加工过程中的切屑形态和切削区表面形貌，以及切削力等基本特征进行了详细讨论。结果表明：金刚石锯片锯切混凝土的过程表现为高速锯切过程中金刚石锯片的冲击引起混凝土表层断裂破碎，水泥石子等在切削区内层受到金刚石磨粒的微切削作用形成粉屑，以及钢纤维和钢丝发生金属塑性变形断裂或被拔拉而断裂的过程。在粘性水泥粉屑以及金刚石磨粒的挤压作用下，多种形态的切屑易粘结成团，并粘附到混凝土锯切表面和锯片节块上而导致锯片堵塞。     

Sawing performance comparison of brazed and sintered diamond wires

Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances of brazed diamond wire have been reported, seldom do these studies refer to its process characteristics. Sawing performances of a brazed diamond wire are investigated and compared with those of a sintered diamond wire on a wire saw machine. The surface topographies of beads selected from the two wires are micro observed before sawing. The sawing tests are carried out in constant feed rate feeding(CFF) and constant normal force feeding(CNFF). In CFF test, sawing force, power, and the cut depths of positions on contact curve are measured. Then, coupled with the observations of beads topographies, sawing force and its ratio, relations of power against material removal rate, and contact curve linearity are compared and discussed. In CNFF test, the sawing rates of the two wires are investigated. The results indicate that the brazed wire performs with lower sawing force(less 16% of tangential force and 28% of normal force), more energy efficiency(nearly one-fifth of sawing power is saved), at a higher sawing rate (the rate is doubled) and with better contact curve linearity as compared with the sintered wire. This proposed research experimentally evaluates the sawing performances of brazed diamond wire from the aspect of process parameters, which can provide a basis for popularizing the brazed diamond wire.     

蜂窝材料锯切角度建模与优化设计

针对蜂窝体脱硝催化剂材料脆性较高,严重影响锯切效率的问题,对蜂窝体材料锯切负载、锯切角度和锯切能耗等方面进行了研究,对蜂窝材料的结构不连续特性进行了归纳,基于经典锯切负载建模理论和大量锯切实验负载分析,提出了通过最优锯切角度的设计来实现高效锯切。以锯切功为比较对象,建立了以锯切角度为基础锯切负载模型,得出了最优锯切角度,并进行了多种角度的锯切实验。实验结果表明:锯切角度45?对应的锯切负载明显小于其两侧的锯切负载;同时,从锯切负载的幅值分布来看,锯切角度为45?的锯切负载波动明显小于35?和55?时的幅值,说明其稳定性也最优。     

岩石材料的金刚石锯切研究进展

使用金刚石工具的锯切加工是切割天然岩石材料的最主要方式。在过去的50年中,伴随着人造金刚石的诞生和规模化生产,人类在石材的金刚石锯切技术研究和开发方面取得了显著成就。回顾了金刚石锯切石材的两个历史阶段;总结了金刚石节块技术、锯切机理以及机床方面的研究成果;讨论了金刚石锯切技术的发展趋势。     

硬脆材料的线锯切割加工技术

综合评述了国内外硬脆材料线锯切割加工技术的发展现状及各种线锯切割方法的特点及用途 ,分析了硬脆材料线锯切割技术的主要发展方向。     

Key Technologies and Development Trends in Advanced Intelligent Sawing Equipments

As a starting point in equipment manufacturing,sawing plays an important role in industrial production.Intelligent manufacturing equipment is an important carrier of intelligent manufacturing technologies.Due to the backward-ness of intelligent technology,the comprehensive performance of sawing equipments in China is obviously different from that in foreign countries.State of the art of advanced sawing equipments is investigated along with the techni-cal bottleneck of sawing machine tool manufacturing,and a new industrial scheme of replacing turning-milling by sawing is described.The key technologies of processing-measuring integrated control,multi-body dynamic optimi-zation,the collaborative sawing network framework,the distributed cloud sawing platform,and the self-adapting service method are analyzed;with consideration of the problems of poor processing control stableness,low single machine intelligence level,no on-line processing data service and active flutter suppression of sawing with wide-width and heavy-load working conditions.Suggested directions for further research,industry implementation,and industry-research collaboration are provided.     

Effects of magnetic field distributions on wire sawing performance

To transport more abrasive grains into the cutting zone, the method of magnetic-induction free-abrasive wire sawing is proposed. A uniform magnetic field is used to magnetize a steel wire and forms a high gradient magnetic field around the wire. The magnetic abrasive grains are adsorbed on the magnetized wire and are transported into the cutting zone, which improves the wire sawing performance. The adsorption of the magnetic abrasive grains is observed using an experimental setup along the wire cross-sectional direction. The results suggest that magnetic abrasive grains are increasingly adsorbed in the paramagnetic region of the wire with increasing magnetic field intensity. Single-wire sawing experiments are conducted on a WXD170 reciprocating wire sawing machine at variable magnetic field intensity and distribution. The results suggest that the change in magnetic field intensity strongly affects the cutting efficiency, kerf loss, and surface roughness. The performance of the magnetic-induction free-abrasive wire sawing under different magnetic field intensities and distributions are compared. The wire sawing performance improves when the uniform magnetic field is evenly distributed in the cutting zone and at the top of cutting zone.