翻边工艺与模具的拓补

指出了传统的翻边工艺与模具在实际应用中的局限性，并在此基础上给出了新的小孔翻边模具结构，拓宽了翻边工艺的应用范围。     

钢板翻边成形预冲孔直径的确定

此文以198909K轴承刚性圈为例,介绍了钢板制件在冷冲压翻边成形工艺中预冲孔直径的确定方法。该方法是通过一次工艺试验,将用理论计算方法得到的预冲孔直径加工出的工件高度与产品要求进行比较,用其差量△H去逼近正确的预冲孔直径。采用该方法,可以保证翻边成形后工件的尺寸要求,对于精度高、批量大的产品加工有很大意义。     

等面积法确定翻边预冲孔直径

介绍了钢板翻边工艺中预冲孔直径的等面积计算与工艺验证结合的确定方法。采用这种方法 ,可以保证翻边成形后工件的尺寸要求 ,对于精度高、批量大的产品加工很有意义     

圆孔翻边极限翻边系数的计算

根据板料屈服极限与断面收缩率的关系,推导出圆孔翻边时极限翻边系数的近似计算公式.     

薄壁三通管翻边成形工艺参数的确定

介绍了薄壁三通管翻边成形时预制孔形状及极限翻边高度的确定方法。     

影响内外曲翻边的质量因素分析及采取的措施

通过汽车空气滤清器毛坯在翻边前后的网格变化,分析了影响内外曲同时翻边的质量因素，并说明了解决质量问题的方法。     

汽车左/右后轮罩冲压工艺及翻边、斜楔翻边模具设计

根据制件的特点 ,分析了其冲压成形的工艺难点 ,制定了合理的工艺 ,简化了模具设计和制造 ,并画出了制件的综合工序图 ,分析了各工序内容和工艺特点 ,说明了各工序模具设计的关键问题。同时以第 5道工序为例 ,重点分析了斜楔翻边、翻边模的结构、工作原理及设计要点     

不锈钢球形法兰高翻边成形问题的分析与应用

通过不锈钢球形法兰高翻边引伸的应力、应变分析 ,探讨了带有球形法兰的高翻边的成形特点和成形方法     

锥状凸模与柱形凸模圆孔翻边的比较分析

通过对锥状凸模与柱状凸模圆孔翻边应力应变分布的对比分析,阐明了采用锥状凸模进行圆孔翻边,可降低制件开裂处的周向应力,提高材料的极限变形程度和减少壁厚变簿。     

U 形件侧壁孔一次冲孔模的设计

介绍了 U 形件侧壁孔的冲模设计,它是与斜契式侧向冲孔完全不同的垂直冲孔方法,一次冲出两侧壁上的孔,既保证了两孔的同轴度,又减少了冲床吨位,提高了劳动生产率。     

冲小孔废料堵塞原因分析及解决方法

分析了冲小孔废料堵塞的各种原因 ,从模具、材料 ,设备三方面介绍了解决冲小孔废料堵塞的方法     

Screening hydroxyapatite for cadmium and lead immobilization in aqueous solution and contaminated soil: The role of surface area

Hydroxyapatite (HAP) has been widely used to immobilize many cationic metals in water and soils. The specific reason why an increase in the surface area of HAP enhances cadmium (Cd) uptake, but has no effect on lead (Pb) uptake, is not clear. The aim of this study was to determine the factors causing the differences in sorption behavior between Cd and Pb by evaluating HAPs with different surface areas. We synthesized HAPs with two different surface areas, which were characterized by X-ray diffraction, N₂ adsorption, and scanning electron microscopy, and then evaluated them as sorbents for Cd and Pb removal by testing in single and binary systems. The sorption capacity of large surface area HAP (1.85 mmol/g) for Cd in the single-metal system was higher than that of small surface area HAP (0.64 mmol/g), but there were no differences between single- and binary-metal solutions containing Pb. After the Cd experiments, the HAP retained a stable structure and intact morphology, which promotes the accessibility of reactive sites for Cd. However, a newly formed precipitate covered the surface and blocked the channels in the presence of Pb, which reduced the number of potential adsorption sites on HAP for Cd and Pb. Remediation experiments using Cd- and Pb-contaminated soil produced similar results to the solution tests. These results indicate that alterations of the structure and morphology during the reaction is an important factor influencing metal sorption to HAP.