TSG Q7002-2019吊运熔融金属的通用桥式起重机相关问题研究

吊运熔融金属的通用桥式起重机在某些规模较小的冶金企业大量应用,其属于高度危险的特种设备之一。文中通过对比分析TSG Q7002—2019实施前和实施后对该类设备的不同规定,结合国家市场监管总局特种设备安全监察局的相关问题答复,提出TSG Q7002—2019实施后新制造和使用登记的在用设备重点关注的安全问题及其相应的解决措施,提高新制造设备的本质安全,降低在用设备的安全隐患。

铝铁通用喷淋水基清洗剂的制备及性能研究

设计并配制了一系列水基清洗剂,通过考察防锈剂、铝腐蚀缓蚀剂、新型高分子表面活性剂、消泡剂对产品防锈性、铝缓蚀性、清洗性、消泡性的影响,优化了配方组成。结果表明:优化得到的产品具有优良的清洗性能(3%,清洗率≥98%),防锈性能(铸铁单片,42 h,无锈)和铝缓蚀性能((35±2)℃,浸泡12 h,不变色);复合消泡剂得到的产品消泡时间短;产品LD_(50)≥5000 mg/kg,LC_(50)≥50000 m^(-3),呼吸道粘膜刺激≤1级,安全卫生质量高。

扬声器新动态

介绍了近年来国外不用纸锥盆作声辐射零件的金属盆,铍、铝、镁、鈦等几种轻金属特性,以及金属氧化后(陶瓷化)的材料特性。还介绍了轻金属合金及供锥盆使用的工程纤维特性。最后介绍一种无磁芯、无导磁夹板的钕铁硼新磁路,并进行了FEMM1in芯模拟,显示其B值可达1.3T。这是一种失真甚小的Hi-Fi用磁路,可供有条件的音响发烧友参考。

New development on additive manufacturing technology and its applications

Additive manufacturing technology has been developed in Xi＇ an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in- novative processes and frontier application research are all being conducted here to catch up with the new develop- ment of this technology. In the paper, newly developed processes, such as ultraviolet-light emitting diode （UV- LED） stereolithography, ceramic stereolithography, and direct metal forming, were described. Some results of the frontier application researches, such as indirect fabrication of ceramic casting mould, wind-tunnel-testing models, photonic crystals and metamatcrials, were also briefly reviewed.