数控加工编程及修改的注意事项

对数控加工编程中容易出现的一些问题进行具体分析,并提出了相应的对策。强调数控编程并不是单一的纯编程,还应结合实际加工的具体情况进行考虑,才能真正发挥数控加工的高效率和高精度等特点。     

洗选设备振动筛管梁的制作

介绍洗选设备振动筛管梁的加工方法     

Design of ANSYS-based Cathode with Complex Groove

The profile of cathode with complex groove needs to be modified time after time during design of electrochemical machining (ECM) cathode.A design scheme using finite element method (FEM) for cathode with complex profile is put forward to shorten the period of cathode design.Based on Laplace equation,the potential distribution on parameter-transformation model was calculated by using ANSYS,which is compared to the potential distribution calculated by substituting conductivity and current efficiency into Laplace equation.According to the difference between the results calculated and simulated by ANSYS,the cathode profile was modified by adjusting the cathode boundary.The experiments show that the dimensions and shape of workpiece machined by numerically simulated cathode conform well with the blueprint.     

Machining of NiTi-shape memory alloys-A review

The emerging trends in the development of advanced smart materials with better unique properties under different environments for a particular application fascinate the researchers and industrialists. Nickel-Titanium based shape memory alloys are exotic materials due to their unique properties such as SME, SE, high damping characteristics, high corrosion and wear resistance and biocompatibility. This article presents an overview of machining processes that can be used to machine the NiTi and its surface induced characteristics such as microhardness, surface roughness, topography, induced layer, residual stress, fatigue and phase transformation. The surface integrity characteristics are discussed for machining of NiTi-SMAs under the category of traditional, non-traditional and micro-machining with the effect of input parameters such as cutting speed, feed, depth of cut, type of lubricant and type of coating material on cutting tool. The conventional machining of NiTi alloys are quite complicated due to high toughness, severe strain hardening, fatigue hardening and distinctive property of NiTi-SMAs such as pseudoelastic and shape memory effect. From this study, non-traditional process is significantly used to machine the NiTi-SMAs due to its better results on surface integrity characteristics. Consequently, future trends are also identified for machining the NiTi-SMAs and to improve the surface integrity characteristics.     

平板裂缝天线的精密制造

平板裂缝天线具有高增益、低副瓣、体积小、质量轻的优点,在机载雷达领域得到广泛的应用.针对某机载雷达天线面阵的研制而提出.根据该天线单面阵结构特点,分析了天线的馈电腔和辐射板的制造工艺要点.并重点从精确定位方式、精密加工装夹设计、误差分配和补偿方法、高速加工工艺设计以及仿真分析等几个方面入手,提出相应解决方案.该方案经实践证明切实可行,对类似的天线研制具有一定借鉴意义.     

叶片电解加工机床的研制

为了能够实现按最优进给角度加工叶片,研制出三轴进给的叶片电解加工专用机床。介绍了机床的加工原理、机床结构、性能规格以及相应的控制系统。实践证明在该机床上电解加工方料毛坯,加工出的叶片经专用量具检测,叶片型面精度符合要求。     

铝活塞机械加工中的质量控制

活塞在使用过程中,常发生气缸窜气、窜油、拉缸和环岸断裂现象,其原因与活塞在机械加工中的质量控制有密切关系,具体应注意解决加工活塞头部、裙部、销孔等时,与设备不协调所应起的误差。     

认清方向 开拓创新 给力内需 稳中求进——关注光伏产业,创新金刚石应用

太阳能资源取之不尽、用之不竭,随处可开发利用,因此绿色光伏发电技术成为实现可持续发展的重中之重,成为发展新型能源的首选和方向。晶体硅在IC、太阳能光伏产业中的大量应用,为包括金刚石线锯加工工具在内的金刚石工具提供了巨大的发展空间。文章较全面地介绍了当今光伏产业的发展情况,指出了我国大力发展光伏产业的必然性、急迫性和可行性,指出了存在的困难和面对的挑战,对包括金刚石线锯在内的金刚石工具在光伏产业的应用进行了综述。     

秸秆板的切削加工质量和胶黏性能

通过对秸秆板家具板件进行锯解,砂光钻孔以及胶黏试验,秸秆扳与普通刨花板的切削加工和胶黏性能比较。结果显示,秸秆板家板件的切削加工质量和胶黏性能均能达到相关的国家标准。     

基于离散数据的汽轮机叶片荒加工的研究

汽轮机叶片毛坯在铸造过程中变形严重,导致粗加工时余量分布极不均匀,提出了一种新的毛坯荒加工算法.该算法能直接从测量数据中生成荒加工刀位轨迹.首先将待加工曲面按照参数线进行网格划分成曲面片,然后采用投影的方法确定每个网格内的曲面片是否为可加工,并将这些可加工网格内的曲面片连接,从而获得荒加工区域.本算法剔除一般粗加工中无用的走刀路径,大大提高了复杂曲面类毛坯数控加工的效率.此算法避免了根据测量的离散数据点进行自由曲面造型,并通过曲面求交来获得荒加工区域.该算法已经应用于某汽轮机叶片的荒加工仿真,结果表明,该算法不仅效率高,而且结果非常理想.