机床电气数控化维改市场潜力巨大——访北京凯奇机床有限责任公司总经理路文忠先生

20世纪90年代以来,由于计算机技术的飞速发展,数控技术也得到了长足发展。我国的机电装备维修与改造市场,形成于20世纪70年代末80年代初,至90年代,已经蓬勃发展起来,成为一个新型的“装备维改”行业。

利用西门子电气对1400t精锻机进行电气及数控化改造

在尊重原设备设计思想的基础上,不迷信原设计,对原来的设计思路充分理解和消化,然后根据现场情况谨慎创新,对1400t精锻机进行了电气和数控化改造,实现和增加了数控系统的模块化、控制线路的数字化、控制软件的智能化、硬件平台的先进化、故障判断的直观化、故障修复的智能化设计,全面更换了1400t精锻机老化的电气系统,实现了优越先进、功能完备、安全可靠的系统数控化。

Microstructure characterization and electrochemical corrosion behavior of Zn and Zn/Mg alloys in H_2SO_4 solution

The three systems of pure Zn, Zn-0.10% Mg(mass fraction), and Zn-0.15% Mg(mass fraction) were cast under controlled atmosphere and their microstructures were characterized by SEM/EDS analysis. The electrochemical corrosion behavior of these three samples was examined in the very aggressive solution of 50% H2SO4(mass fraction) using electrochemical impedance spectroscopy(EIS) and potentiodynamic polarization measurements. The results show that magnesium improves in some extent the corrosion resistance of pure Zn in 50% H2SO4(mass fraction) confirmed by EIS test. Results of polarization measurment also demonstrate that small amount of Mg significantly improves the passivation of Zn in the test solution. Results of surface morphology of the samples and EDS analysis reveal that Mg reduced the corrosion attacks to pure Zn.