激光照射对不同厚度硅钢片铁损的影响

介绍激光束对电化学抛光后的硅钢片进行的照射实验;研究表面粗糙度、厚度及激光照射后对硅钢片铁损的不同影响规律.实验表明,粗糙度低、铁损小,激光照射后,相对下降率高;激光照射前后,厚度与铁损的关系曲线有极值,即轧向铁损在0.16～0.18 mm厚度范围内,横向铁损在0.18～0.20 mm厚度范围内有极小值.     

激光照射对不同厚度硅钢片铁损的影响

介绍激光束对电化学抛光后的硅钢片进行的照射实验;研究表面粗糙度、厚度及激光照射后对硅钢片铁损的不同影响规律。实验表明,粗糙度低、铁损小、激光照射后,相对下降率高;激光照射前后,厚度与铁损的关系曲线有极值,即轧向铁损在０．１６￣０．１８ｍｍ厚度范围内,横向铁损在０．１８￣０．２０ｍｍ厚度范围内有极小值。     

LED灯引线支架用黄铜带生产工艺控制要点

通过研究退火保护气的含氧量、再结晶退火温度、冷加工率和轧辊磨削粗糙度对LED灯引线支架用黄铜带表面质量的影响发现,控制黄铜带材退火保护气的含氧量,可以消除带材表面氧化变色;降低再结晶退火温度,根据成品硬度值要求选择适宜的冷加工率,可以在一定程度上抑制表面脱锌麻坑产生;通过控制轧辊磨削的粗糙度可以在一定程度上控制成品带材表面粗糙度。     

缓蚀剂对推拉式酸洗工艺产品表面质量的改善

介绍了缓蚀剂的作用机理,并通过实验室研究和生产试验,研究了其对推拉式酸洗工艺产品表面质量的改善效果。结果表明,酸液中添加缓蚀剂后,试样表面颜色明亮,粗糙度较好,铁损量较小;酸洗时间越长,缓蚀剂的抑制作用越弱,带钢的铁损量越大。缓蚀剂可抑制过酸洗的发生,使铁损率下降0. 22%,直接提高产品成材率的同时,降低酸液消耗24%,经济社会效益显著。     

激光刻痕对取向硅钢铁损及噪音性能的影响

研究了不同输入功率激光刻痕对取向硅钢铁损和噪音性能的影响。结果表明:不同输入功率激光刻痕可改善取向硅钢铁损,铁损改善率达到10%以上;但不同输入功率激光刻痕对取向硅钢噪音性能的影响有差异,功率越大,刻痕深度和宽度越大,钢基被加热到更高温度时内应力增大,新增的闭合磁畴会导致取向硅钢噪音性能变差。     

轧制超薄带时平整度的研究

用多辊轧机轧制厚度小于001mm的金属和合金超薄带时,整个带材表面易产生橘皮状波纹,很不平整。本文研究了前张力、总压缩率、带材边部质量、轧辊表面光洁度和材质等工艺因素对橘皮状波纹的影响。同时测定了带材变形区形状、沿宽度的延伸、应力和织构等,分析证明产生橘皮状波纹的原因是遍布带材上各点的不均匀变形应力,这种不均匀变形主要是由于轧辊表面粗糙度和带材晶粒变形各向异性造成的。由于带材厚度极薄,抗弯能力小,因此在很小应力作用下就产生布满带材表面的橘皮状波纹。实验证明,采用合理的工艺制度,可以消除橘皮状波纹,得到平整的超薄带材。     

取向硅钢隔离剂中碱金属添加剂提高磁特性的有效作用

单取向电工钢板作为软磁材料其磁特性包括激磁特性和铁损特性必须良好。取向硅钢生产是通过在最终退火中使之产生具有(100)[110]方位的高斯织构来获得轧向激磁特性和铁损特性优良的成品。它是利用析出相例如氮化物、硫化物弥散分布基体中抑制正常晶粒长大让高斯晶核反常长大而获得的,因此在高温退火中保护好已经形成的析出相和防止高斯晶核过分长大是很要重的。     

化学成分对低牌号冷轧无取向电工钢铁损的影响

通过50 kg真空感应炉熔炼-锻造成100mm×25mm板坯-350四辊轧机热轧2mm带材-350四辊冷轧机轧成0.5mm带材流程,研究了主要元素(%)-0.015～0.070C、1.21～2.30Si、0.25～0.33Mn、0.013～0.018P、0.008～0.017S、0.002～0.210A1对低牌号冷轧无取向电工钢铁损的影响.结果表明,随钢中碳、磷、硫、锰含量的增加,冷轧无取向电工钢铁损明显增加;随硅含量增加,钢的铁损降低;铝与钢中的氮形成细小的AlN颗粒,阻碍钢材晶粒长大,随钢中铝含量增加,铁损增加.     

300 mm双面磨削硅片表面纹路模拟

分析了硅片双面磨削的运动轨迹,并给出了砂轮上P点相对于硅片的运动轨迹。还对砂轮运动轨迹进行了模拟。得出以下结论：砂轮上P点在硅片上的运动轨迹仅与它们的相对转速比I有关,而与两者的分别转动角速度值没有关系。硅片磨削的磨纹密度沿着硅片径向逐渐减小,硅片中心处磨纹最密集,磨纹密度最大,表面粗糙度最小,越靠近硅片的中心硅片的磨纹密度越大,表面粗糙度越小,表面质量越好;反之,越靠近硅片的边缘磨纹密度越小,表面粗糙度越大,表面质量越差。砂轮和硅片旋转方向相同时单颗磨粒的轨迹带有紫荆花形状,说明其磨削是不均匀的,磨削效果不好;而砂轮和硅片旋转方向相反时单颗磨粒的轨迹则不具有这种形状,磨削很均匀,磨削效果好。硅片磨纹密度是由砂轮和硅片的速比决定的,速比ωwωs的不可约分数m/n中n越大,硅片磨纹密度越密,表面粗糙度越小,磨削表面质量越好。     

表面质量对取向硅钢铁损的影响

取向硅钢的表面质量(包括底层质量,内氧化层以及表面氧化)对铁损会有明显的影响,但各因素对铁损的影响程度和影响机理仍不清楚。通过轻酸洗去掉外氧化层比较酸洗前后铁损变化,酸洗去掉底层比较去掉底层前后铁损的变化,抛光去掉底层及内氧化层比较抛光前后铁损的变化来研究表面质量各因素对铁损的影响。发现表面氧化对铁损没有明显影响,内氧化层对铁损影响最大。用扫描电镜分析内氧化层的形貌及成份发现内氧化层是镁橄榄石和尖晶石的离散质点。内氧化层通过其对180°畴壁移动的钉扎增加铁损,底层通过增加90°闭合畴的体积分数增加铁损。     

碳纤维复合材料超声辅助磨削表面质量试验研究

对碳纤维复合材料超声辅助磨削表面质量进行工艺试验研究,分析复合材料表面质量评价方法,在不同加工参数下进行磨削试验,研究超声辅助磨削的去除机理和碎屑形貌.结果表明:超声辅助磨削比普通磨削加工工件的表面粗糙度值降低约10％～30％,同时超声辅助磨削形成的加工表面更加平整,一致性更好,更容易形成好的表面质量.     

An experimental study of process behavior in planar flow melt spinning

A parametric study concerning the process behavior in planar flow melt spinning (PEMS) of Pb−Sn alloy ribbons is presented in this article. Experiments were conducted to develop correlations between the produced ribbon thickness and process variables, including wheel speed, crucible pressure, nozzle-wheel gap, and melt superheat. The ribbon thickness was found to vary with the wheel speed to the power of −2/3 and the crucible pressure to the power of 1/3. Puddle lengths were found to increase linearly with crucible pressure. The ribbon thickness behaved in a two-term exponential manner in relation to the melt superheat. A processing window for the production of high-quality ribbons was determined using dimensionless parameters. Five distinct ribbon patterns were identified, and their respective surface roughnesses were measured and reported.     

The effect of manganese and sulfur contents on the magnetic properties of cold rolled lamination steels

The effect of Mn and S contents on the magnetic properties of cold rolled lamination steel was investigated in eleven low C steels. The results indicated that Mn content was a major factor influencing the magnetic quality of the lamination steels. An optimum range of Mn was a prerequisite for optimum permeability and exciting power. For Mn contents up to 1.25 Pct, the core loss improved nonlinearly with increasing Mn content. At higher Mn contents, the magnetic properties deteriorated for the experimental conditions used as a consequence of poor grain size development after the final decarburizing anneal. Decreasing the S content from 0.018 Pct to 0.010 Pct improved the core loss at all induction levels. The permeability and exciting power were improved at 1 T, but a very slight deterioration in permeability and exciting power was seen at 1.5 and 1.7 T. Estimations of core loss improvement based on regression equations indicated that lowering the S content from 0.018 Pct to 0.010 Pct improved the core loss in w/lb-mil as follows: 0.0041 at 1 T, 0.0079 at 1.5 T, and 0.0093 at 1.7 T (1 w/lb-mil = 86.8 w/kg-mm). The response surface analyses indicated that Mn content in the range of 0.7 Pct to 1 Pct, depending on the S content, should develop optimum magnetic properties. However, Mn content at the low end of this range is preferred for practical applications. This paper is based on a presentation made at the symposium “Physical Metallurgy of Electrical Steels” held at the {dy1985} annual AIME meeting in New York on February 24–28, {dy1985}, under the auspices of the TMS Ferrous Metallurgy Committee.     

Evolution of appearance profile of hot-dip galvanized car-body steel sheet during deformation process

In recent years,the waterborne free intermediate coating process has been widely used in the automotive industry.Because the baking times and coating thickness are decreased,the surface covering capability of the painting process is reduced,which directly affects the appearance quality (long-and short-wave values) of the body paint.Thus,there are correspondingly higher requirements for the white body surface profile prior to painting.The surface profile of the white body is mainly affected by the plate material,the surface profile,and the deformation process.So,the change rule for the surface profile during deformation of the steel plate is a key factor in coating appearance optimization.In this paper,we first analyze the typical deformation of the outer cover of a car body.Then,we examine the change tendency of the surface profile of steel plates with respect to different deformation rates,specifically for a steel plate comprising a hot-dip galvanized bake-hardened steel sheet.Based on our analysis of the influence of the deformation on the coating appearance,we selected 3％,5％,and 8％ deformation rates in this research.We found the roughness (Ra) value in the typical deformation range (3％-8％) of the car body to exhibit a decreasing trend at first and then an increasing trend.The Ra value of the 8％ deformation is not more than the original plate test value.When the Pc value of the original plate is in the lower range (about 60),it exhibits a slight increasing trend in the deformation process (3％-8％).And when the Pc value of the original plate is in the higher range (about 120),it exhibits no increasing trend in the deformation process (3％-8％).In contrast,the waviness (WCA) value in the car body's typical deformation range (3％-8％) shows a significant growth trend.     

The Effect of Annealing Processes on Fish-Scaling Resistance in V-Ti-N Microalloyed Low Carbon Steel Sheets for Enameling

Annealing process will have greatly influence on microstructure of V,Ti and N microalloyed low carbon steel sheets.In this paper,the experimental steels with given amount of V,Ti and N elements were annealed at 4 routes to simulate batch annealing and continuous annealing processes,respectively.The enameling tests for the annealed steel sheets were undergone in same enameling and firing processes to study the relationship between microstructure and fishscale.The result shows that the cold-rolled steel sheets annealed at 750 ℃for 6 minutes even for 30 minutes exhibit excellent fishscale resistance.     

Dipping Paint Curing Amorphous U-Core Used as Reactor

 Non-oriented silicon steel (35W310) and amorphous ribbon (Fe78Si9B13 amorphous alloy) reactor U-cores are made by welding and dipping paint curing, respectively. Amorphous U-core used to make reactor cut sharply eddy current loss due to high electrical resistivity characteristic, thickness of thin ribbon and insulation of dipping paint. The amorphous alloy has high and constant magnetic permeability, and is more suitable for reactor design power to filter high order harmonic component. Keeping off high magnetostriction district with magnetic flux density of 50-100 mT can weaken influence on inductance of inductor due to elongation of magnetostriction. Amorphous alloy has a lower temperature rise using the software Infolytica 7. 2 simulation.     

Effects of Wheel Surface Conditions on the Casting of Amorphous Metal Ribbons

The wetting of the liquid metal on the casting wheel surface is important in the continuous casting of amorphous metal ribbons. The wetting characteristics are substantially revealed by the wetting pattern on the wheel-side surface of the ribbon, which consists of areas of air pockets and areas of direct contact between metal and wheel. Experimental results will be presented regarding the effects of the condition of the casting wheel surface on the wetting pattern and the related interfacial phenomena such as the ribbon surface smoothness, the heat transfer at metal-wheel interface, and the separation of ribbon from the wheel. In particular, the mechanism of formation of the periodic ribbon surface defect known as “fish scale” and the elimination of this defect by changing the condition of the casting wheel surface will be discussed.     

带状锌阳极的应用技术

牺牲阳极法阴极保护因其不需电源、管理简单、电流分布均匀,特别是对于形状特殊的构筑物。因此,深受人们的欢迎,但它的缺点在于阳极电位有限,故在高电阻率环境下不能应用。为此人们开发了带状牺牲阳极,目前常用的有带状镁阳极和带状锌阳极,可把应用领域扩大到数百Ωm。国内早期开发出来的带状阳极是镁阳极,由于镁阳极的效率低、寿命短,使其使用受到限制。近几年来带状锌阳极问世,便显示出独有的生命力,它的应用主要在套管内部、防交流干扰、高电阻率环境、储罐罐内和罐底外壁等,文章简要介绍国内外相关实践。     

浅谈激光腔研磨技术

为了使激光腔反射的激光能量损失最小,必须使激光腔的表面粗糙度达到很高的水平。采用的方法是:用铜合金作激光腔的本体,然后在其内腔镀金。为达到此要求,其镀覆表面必须进行研磨,使基体表面粗糙度达到一定的要求后,方能使镀覆后的表面有较高的表面粗糙度。     

冷轧高端电镀铬基板表面粗糙度控制研究

根据高端电镀铬基板后步工序的要求,结合鞍钢冷轧现有设备,研究了轧机轧辊粗糙度配置、轧辊磨削、干平整等工艺对于钢板表面粗糙度的影响,使得平整后表面粗糙度达到了0.1μm以下,表面光泽度达到了400,表面反射亮点满足要求,成功开发出具有鞍钢特色的高端电镀铬冷轧基板。