磨削模架产生的问题及解决方法

导柱、导套属于模架的配合件,其加工的尺寸精度和形位精度要求很高,零件之间要相互配合.针对磨削导柱、导套出现的问题提出一些解决方法,从而提高了加工效率,保证了导柱、导套的配合精度.     

Ф3．5m氟化氢反应炉的研制

采用设计院技术对无水氟化氢反应炉进行研制，克服筒体整体加工、动静密封配研、夹套的焊接、传动部分加工等难题，并针对研制过程中的关键技术难题，采取合理工艺措施，满足了反应炉的制造要求，为类似产品的制造提供借鉴。     

砂轮振动对磨削区时变润滑效应的影响

为研究砂轮振动对磨削区压力、膜厚及温度的影响,建立考虑时变效应的砂轮振动磨削的润滑模型,分析陶瓷结合剂CBN砂轮磨削45~#钢的过程中的最大压力、最小膜厚和最大温度随振动的幅值、频率及砂轮速度的变化情况。结果表明:考虑砂轮振动的时变效应时,不同瞬时下的压力及膜厚变化较大;随砂轮振幅和频率的增大,当砂轮振动到最低点时最大压力及最大温度增大,最小膜厚减小,而振动到最高点时则相反;时变效应使最大压力、最小膜厚与最大温度出现了滞后现象;当砂轮速度增大时,最大压力减小、最小膜厚增大,这有利于润滑且能减少磨粒磨损,但是最大温度增大容易产生磨削烧伤和热变形,影响工件磨削后的表面质量,所以应据此选择合适的砂轮速度。     

Enhanced Performance of Nanostructured Coatings for Drilling by Droplet Elimination

Cutting tool performance is mainly characterized by material substrate, cutting edge geometry, and coating, and also by a good choice of the cutting parameters, mainly cutting speed, depth of cut, and feed. In drilling a good choice of substrate/coating can reduce production costs per hole cut by 50%. Coatings evolution has gone from monolayer to nanostructured and/or nanometric-scale multilayer coatings. These are used because of their high hardness, good corrosion and oxidation resistance, and thermal stability. Cutting edge preparation on the one hand and droplet elimination after the coating process on the other are important issues for reaching a good tool/coating performance, being a key issue. In this article a series of coatings for drilling low and medium carbon alloyed steels are presented, along with their performance. Validation tests were carried out on steel 42CrMo4, very often used in the automotive sector. Seven coatings were tested, including AlCrSiN, µAlTiN, TiAlCrN, AlTiCrN, AlCrN, AlTiSiN, and TiAlSiN. Flank wear, evolution of drilling thrust force and torque, damage on cutting edge faces on primary cutting edge, and behavior of drill bit secondary edges were studied. A final elimination of droplets by drag grinding was performed in several cases. Process monitoring, scanning electron microscope (SEM) microscopy, and energy-dispersive X-ray (EDX) analysis were used, concluding that the best results were for µAlTiN, TiAlSiN, and AlTiSiN. Reasons for the good behavior are the good surface finishing after droplet elimination and the high thermal stability of these protective layers.     

磨削液自动循环控制系统

通过分析磨削液供应的现状,提出了建立磨削液自动循环控制系统,给出了磨削液自动循环系统的软、硬件设计方法,利用PLC的相关功能实现了磨削液供给、维护、补充和更换的自动控制目地。     

无油沟圆柱滚子轴承滚道及挡边磨加工方法

在介绍圆柱滚子轴承滚道无油沟套圈的磨削加工方法的过程中,重点阐述了在3M1420沟道磨床中采用成形切入磨削方法及砂轮修整时的改进方案。实践证明,采用成形切入磨削的加工方法,能够实现无油沟滚道的加工。     

抛光机磨头结构改进及其对振动的影响实验研究

为了降低摆动式抛光机磨头振动,对现有磨头的结构进行了改进。建立了改进后磨头的激振力方程,分析了改进后磨头的减振机理。由一系列的改进前与改进后磨头振动加速度的对比实验表明,改进后磨头振动性能优于改进前的磨头,有显著的减振作用。     

卧式行星磨粉磨水泥熟料的最佳参数研究

采用自行设计的卧式行星球磨机,在公转转速为300 r/min、自转与公转转速比为2.5的条件下,研究装球率、料球体积比、填充率对水泥熟料粉磨的影响。结果表明:成品粉体产率随装球率的增大呈增加趋势,在装球率为6.00%～10.51%时尤为明显,装球率大于10.51%时,增加趋势开始变缓;在固定填充率下,料球体积比为0.5时,成品粉体产率最大为65.80%;料球体积比为0.5,总填充率为35%时,成品粉体产率最大为68.56%。     

不同结构三乙醇胺系化合物的合成及其对水泥的助磨效果

为考察不同三乙醇胺系化合物对水泥的助磨效果,合成几种不同结构的三乙醇胺系化合物,研究它们对普通硅酸盐水泥的助磨效果,并探讨它们助磨机理。结果表明:合成的三乙醇胺系化合物均有较好的助磨效果,并且链的长度越短,相对分子质量越小,其中含有助磨效果的极性官能团数量越多,对水泥的助磨效果越好。