超高速陶瓷结合剂CBN砂轮关键制备技术的研究

砂轮制备技术是实现超高速磨削的关键之一.本文介绍了超高速陶瓷结合剂砂轮的特点,综述了超高速陶瓷结合剂CBN砂轮的关键制备技术,分析了我国CBN磨料、砂轮结构、陶瓷结合剂、砂轮制备工艺等的研究现状,最后展望了超高速陶瓷CBN砂轮的研究及应用前景.     

超高速陶瓷结合剂CBN砂轮制造及应用

介绍了超高速陶瓷结合剂CBN砂轮的制造技术,从基体设计、CBN磨料选择、陶瓷结合剂制备、砂轮配方及尺寸的确定、砂轮制备等方面进行了详细分析。最后对超高速陶瓷CBN砂轮的应用前景进行了展望。     

纳米陶瓷结合剂CBN砂轮磨削高温镍基合金研究

高温镍基合金作为一种难加工材料,在磨削过程中会产生强烈的塑性变形,磨屑极易粘附在砂轮表面堵塞气孔从而影响砂轮寿命及磨削质量。为提高高温镍基合金磨削质量,制备了纳米陶瓷结合剂砂轮和普通陶瓷结合剂砂轮,并分别对GH4169镍基高温合金进行了磨削实验。通过测量磨削过程中工件的表面粗糙度、磨削力、磨削温度,结果表明：在相同的工况条件下,纳米陶瓷结合剂砂轮比普通陶瓷结合剂砂轮的磨削质量更好,前者磨削后工件表面粗糙度更小,磨削力更低,磨削温度比后者低15℃～20℃,可见纳米陶瓷结合剂CBN砂轮对磨削高温镍基合金有着更优异的性能。     

强磁场环境下含有纳米添加物的陶瓷结合剂CBN砂轮制备技术及其磨削

<正>针对我国目前高性能陶瓷CBN砂轮制备方面的落后现状及技术瓶颈,本文尝试将纳米材料技术和强磁场材料制备技术引入到了砂轮制备过程中,并制得了具有特定磨粒取向和致密结合剂结构的纳米陶瓷结合剂CBN砂轮,并通过开展大量针对金属和硬脆材料的磨削试验比较了强磁场砂轮和普通陶瓷结合剂CBN砂轮的磨削性能。具体内容包括以下几点。(1)将多种纳米材料添加至传统结合剂配方中,并通过开展正交试验优化了纳米陶瓷结合剂的组分配方和各组分占比,     

磨削液对陶瓷结合剂CBN砂轮磨削性能影响

分析了磨削液对陶瓷结合剂CBN砂轮磨削性能的影响，使用3种磨削液在精密外圆磨床M1420E上进行了磨削加工实验，用加工表面微观形貌、表面粗糙度R。值、工件表面残余应力以及砂轮径向磨损量对磨削液效能进行评价。结果表明，轻质润滑油不仅能提高工件表面质量，降低表面粗糙度值，而且砂轮磨损量明显降低，乳化液和化学合成液对磨削性能的影响各有利弊，润滑油是陶瓷结合剂CBN砂轮磨削的优选磨削液。     

磨削钛合金用陶瓷CBN砂轮的研制

阐述了磨削钛合金用陶瓷结合剂CBN砂轮的研制：主要有结合剂体系的选择，CBN砂轮浓度的选择，填充剂选择，还研究了磨削时砂轮线速度对磨削效果的影响。研究试验结果表明，磨削钛合金时CBN砂轮的浓度应在125％左右，浓度太高或太低都会使磨削成本增加；填充剂应选用碳化硅而不用CBN砂轮常用的氧化铝；磨削时砂轮线速度应在45m／s以上。这些结果可作为选用陶瓷CBN砂轮磨削钛合金时的参考。     

陶瓷结合剂CBN砂轮对45淬硬钢的磨削研究

用陶瓷结合剂CBN砂轮对45淬硬钢工件进行磨削试验，对磨削过程中CBN砂轮的磨损和磨削比进行了研究，发现了陶瓷缝合剂CBN砂轮的磨损特征。     

陶瓷结合剂CBN砂轮提高球轴承环的生产率

将陶瓷结合剂CBN(立方氮化硼)砂轮来磨削球轴承环是以这种砂轮材料首先用于生产的一种。使用这种新的CBN结合剂,能保持砂轮的精确廓形到200次磨削循环,免除了用传统氧化铝(Al_2O_3)砂轮时的频繁修整,从而大大提高了生产率。当CBN砂轮确需修整时,与     

基于超高速磨削的CBN砂轮特性选择

结合超高速磨削的特点及超高速CBN砂轮结构,论述了超高速CBN砂轮中磨料的种类、特点及适用范围;粒度与磨削精度、粗糙度、效率的关系;硬度、浓度、组织的一般选用原则。着重讨论了结合剂的种类、特点和适用范围,突出了陶瓷结合剂CBN的优点,并强调了超高速磨削砂轮基体的重要性和设计要求以及材料的选择。     

陶瓷结合CBN砂轮的磨削性能研究

以试验为基础,详细研究和分析了陶瓷结合剂立方氮化硼砂轮磨削高钒高速钢时,其磨削力、磨削比、比磨除率、磨削比能、表面粗糙度与工艺用量之间的关系,并指出了合理使用这种砂轮的方法。文章还介绍了陶瓷结合剂CBN砂轮的修整条件,并给出减少初始磨削刀的修整方法。     

砂轮线速度对CBN砂轮磨损影响的磨削试验研究

通过用陶瓷结合剂CBN砂轮对45淬硬钢工件进行磨削试验，深入分析了砂轮线速度对砂轮磨损的影响，获得能够进行高速高效磨削的合理砂轮线速度。     

A comparison between conventional speed grinding and super-high speed grinding of (TiCp + TiBw) / Ti–6Al–4V composites using vitrified CBN wheel

Comparative grinding experiments of (TiC_p?+?TiB_w)?/?Ti–6Al–4V composites were conducted using vitrified CBN wheel at the conventional wheel speed of 20 m/s and the super-high wheel speed of 120 m/s, respectively. The grinding behavior, i.e., grinding force and force ratio, grinding temperature, specific grinding energy, and ground surface morphology were analyzed. The results obtained indicate that the normal and tangential grinding forces at the super-high wheel speed are smaller than that at the conventional wheel speed. However, the force ratio, the specific grinding energy, and the grinding temperature show a contradictory trend compared to the grinding force between the conventional speed grinding and the super-high speed grinding. The main defects of the ground surface of (TiC_p?+?TiB_w)?/?Ti–6Al–4V composites are voids, micro-cracks, fracture or crushed, pulled-out, and smearing.     

机床特性对陶瓷结合剂CBN砂轮磨削比的影响

通过用陶瓷结合剂CBN砂轮对45淬硬钢工件进行磨削试验,深入分析了机床特性对CBN砂轮磨削比的影响,获得了能够进行CBN砂轮高速高效磨削的机床特征参数。     

Mechanical properties of new vitrified bonds for cBN grinding wheel

In this study, three ZnO-B2O3-SiO2 frit compositions with low softening point were investigated in order to lower the firing temperature of cBN-based vitrified bonded wheel. It was tried to develop a new composition of vitrified bond with lower firing temperature and compatible mechanical properties compared with conventional bond by evaluating the mechanical properties of each frit composition. Suggested bonds have softening points of 500°C to 520°C and bending strengths of 60 to 90% compared to the conventional bond. The maintenance of bending strength of bond composition even with less network former is attributed to the growth of Gahnite, which has submicron size and relatively large thermal expansion coefficient. On the other side, Willemite (ZnO·SiO2) with large crystalline size and low thermal expansion resulted in the deterioration of bending strength. The Rockwell hardness used as common measure of bonding of grinding wheel showed no statistically significant difference among frit compositions in the results.     

MODELING OF DRESSING FORCES DURING ROTARY DIAMOND CUP DRESSING OF VITRIFIED CBN GRINDING WHEELS

This paper presents a mathematical model of dressing of vitrified CBN grinding wheels by a diamond cup dresser. It predicts the dressing forces during rotary diamond cup dressing of vitrified CBN grinding wheels. This model is based on the fracture of abrasive grits, the fracture of the bond and the contact forces between dresser and grinding wheel. It considers the kinematical influences and in particular speed ratio and overlap factor during the dressing process. A Weibull distribution is used to predict the probability of bond fracture and also the collision number between the diamond grits of a rotating dresser and the CBN grits. This model is validated by experimental results. The theoretical modeling values agree reasonably well with the experimental results. On the basis of this model the effect of different cup dressing parameters on dressing forces is theoretically discussed with the aim of establishing appropriate dressing process configurations. Furthermore the presented model provides a basis for further prediction of wheel topography and the grinding process.     

微晶玻璃在立方氮化硼砂轮结合剂中的应用研究

研究了微晶玻璃中加入低熔物、成核剂后对微晶玻璃热处理曲线、微晶量及微晶体尺寸的影响,并通过测试改性微晶玻璃的软化温度和热膨胀系数对CBN磨粒的把持强度,进而将微晶玻璃用作CBN砂轮结合剂的作用作了研究,经过在数控凸轮轴磨床上的试验证明,微晶玻璃结合剂的CBN砂轮的磨削效果很好.这也为今后CBN砂轮陶瓷结合剂性能的提高提供了新方法.