KDF2滤棒成型机组纸盘架装置的改进

KDF2滤棒成型机组的纸盘架装置采用螺母锁紧定位,更换盘纸时操作不便且回转盘没有准确的定位装置,为此对纸盘架装置进行了改进.在不改变机座结构的前提下,将气缸与纸盘架设计成一体,气缸安装在回转盘上,纸盘锁紧装置通过轴承与活塞轴连接,使气缸活塞不随纸盘旋转,保证气缸活塞的密封性.控制气路设置在固定板上,通过浮动的连接装置连接气缸.纸盘架装置改进后,能够自动锁紧和释放纸盘,更换纸盘方便.增设的回转盘定位装置,保证了固定板与回转盘通气孔的准确接通,回转盘回转定位准确,避免了回转盘转动不到位现象的发生,生产过程运行平稳可靠.     

集体换粗纱法的应用分析

探讨实行集体换粗纱的必要性.分析了传统换粗纱方法存在的缺陷及实行集体换粗纱的诸多好处及所存在缺点的解决途径.认为:集体换粗纱具有减少空粗纱断头,降低粗经、粗纬、竹节纱疵和接头纱疵等优点,有利于提高高档面料的布面质量.此法对细纱机的生产效率略有影响,粗纱回花率有所增加.可通过适当减少关车时间来补偿效率损失,推广采用粗纱尾纱处理机,提高处理效率和质量,同时粗纱工序应实行定长、定位落纱.力求粗纱直径大小一致,减少锭间张力差异和大小纱张力变化,降低粗纱机断头率,消灭连续或多次断头的纱锭,以期获得良好的效果.指出:集体换粗纱的优点大于缺点,应予以推广.     

Comparative study on local and global mechanical properties of bobbin tool and conventional friction stir welded 7085-T7452 aluminum thick plate

7085-T7452 plates with a thickness of 12 mm were welded by conventional single side and bobbin tool friction stir welding (SS-FSW and BB-FSW, respectively) at different welding parameters. The temperature distribution, microstructure evolution and mechanical properties of joints along the thickness direction were investigated, and digital image correlation (DIC) was utilized to evaluate quantitatively the deformation of different zones during tensile tests. The results indicated that heat-affected zone (HAZ), the local softening region, was responsible for the early plastic deformation and also the fracture location for SS-FSW samples, while a rapid fracture was observed in weld nugget zone (WNZ) before yield behavior for all BB-FSW specimens. The ultimate tensile strength (UTS) of SS-FSW joints presented the highest value of 410 MPa, 82% of the base material, at a rotational speed of 300 rpm and welding speed of 60 mm/min, much higher than that of BB-FSW joints, with a joint efficiency of only 47%. This should be attributed to the Lazy S defect produced by a larger extent of heat input during the BB-FSW process. The whole joint exhibited a much higher elongation than the slices. Scanning electron microscopic (SEM) analysis of the fracture morphologies showed that joints failed through ductile fracture for SS-FSW and brittle fracture for BB-FSW.     

干电池电芯粉pH值的控制与检测

笔者对锌锰干电池电芯粉的pH值控制范围和检测方法进行了探讨,认为检测拌粉处电芯粉的pH值并给予控制,效果较好。此方法简便迅速、测量准确,便于指导生产,有利于稳定产品质量,预防纸板电池早期结晶。