瓦楞辊热处理生产工艺简介

瓦楞辊是我厂瓦辊纸板生产线（以下简称瓦线）上的关键部件，而瓦楞辊的热处理硬度又是考核瓦楞辊质量指标的重要参数，其硬度的高低直接影响到瓦楞辊的寿命，影响到瓦线的开停机时间。为此，我厂和机械部北京机电研究所合作，研究出提高瓦楞辊使用寿命和承载能力的热处理工艺。为此，配置了320kw、8000Hz的中频电源及4m淬火机床，选购了180A的十1000×4000mm离子渗氮炉，又配套购置了190kw的1000×4000mm井式炉和台车式回火炉。可对直径小于400mm，长度4000mm以下的瓦楞辊进行离子诊氮-和表面感应淬火的复合热处理，并可对直径小于1000mm…     

Effect of ultrasonic power and bonding force on the bonding strength of copper ball bonds

Copper wire, serving as a cost-saving alternative to gold wire, has been used in many high-end thermosonic ball bonding applications. In this paper, the bond shear force, bond shear strength, and the ball bond diameter are adopted to evaluate the bonding quality. It is concluded that the ef/~cient ultrasonic power is needed to soften the ball to form the copper bonds with high bonding strength. However, excessive ultrasonic power would serve as a fatigue loading to weaken the bonding. Excessive or less bonding force would cause cratering in the silicon.     

Synthesis of LaF3 superfine powder by microwave heating method

LaF3 superfine powder was synthesized from La(CH3COO)3 and NH4 F by microwave heating method,using ethanol or pure water as dispersants respectively. The results of XRD and SEM indicate that the superfine powder has high purity, regular particle shape and narrow distribution of granularity. The granularity of the best sample is in the range of 100 -200 nm. The influence of different dispersants on the crystal degree and microstructure was discussed. After the superfine powder was formed into a slice at pressure of 25 - 60 MPa, its electrochemical impedance spectroscopy was tested by electrochemical impedance spectroscopy (EIS) measurement. The result shows that the grain refining of LaF3 powder increases its ionic conductivity. Compared with traditional preparation methods of LaF3 powder, the advantages of microwave heating method were summarized.     

34CrNiMo钢齿轮轴开裂原因分析

对34CrNiMo钢齿轮轴的化学成分、金相组织及断口分析表明，其淬火开裂的主要原因是由于锻造温度过高，导致过热缺陷所致。     

美国铝工业空气污染控制法规

引言美国环境保护局(EPA)受权制订若干规范、条例来保护与提高全国的大气质量。其中关于限制原铝和再生铝工厂排放污染物的规范和条例是:新固定污染源的运行标准;协助各州政府制订现有污染源标准和排放指南,以及     

肥皂冒霜的成因探讨

本文讨论了肥皂冒白霜的主要原因,即肥皂中无机盐含量和油脂皂化后的有机酸败。生产实践证明,皂基含NaOH≤0．3%,NaCl≤0.2%,SiO2≥3%为宜;有机酸中含低分子酸和不饱和酸,必须控制油脂的酸价和严格控制工艺操作。     

用原子力显微镜观察菁染料聚集体

对应用原子力显微镜观察菁染料聚集体的文献进行了评述 ,在此基础上采用原子力显微镜观察了 2个感绿增感染料的聚集体     

长化恩德炉运行中的问题及对策

我公司为了降低成本，提高企业的竞争能力，于2003年把煤气化工艺由富氧连续气化改为恩德粉煤气化。针对恩德炉实际生产过程中出现的一系列问题，公司及时采取相应措施，取得了较好的效果。下面简要介绍我公司恩德炉运行中出现的问题及应对措施。     

非离子型聚氨酯预聚体可聚合乳化剂的合成及性能

采用甲苯二异氰酸酯 (TDI) ,聚乙二醇 10 0 0 (PEG -10 0 0 ) ,丙烯酸为原料 ,通过分子设计合成了带有双键的非离子型可聚合乳化剂。并对其CMC值、流变行为及乳化力进行了表征。结果显示 :此乳化剂的CMC值在 6.0 %左右、浊点为 (54± 1)℃、HLB值为 16.1可以取代OP -10的乳化能力 ;该乳化剂可以与丙烯酸酯类单体进行乳液共聚 ,得到性能优异的共聚乳液