金属塑性成形技术基础讲座第二讲 金属塑性成形过程的理论基础

要对金属进行固态塑性成形,则必须对金属在工业上实现这类过程的可能性及局限性作出正确的评价,以便于掌握和运用这类过程。     

左右横摆臂成形工艺及模具设计

通过对零件成形工艺的分析,确定了合理的冲压方案,减少了模具的投入. 介绍了模具的结构特点及工作过程,具有一定的参考价值.     

In—situ Composite Based on Poly （ethylene terephthalate）,Polyamide and Polyethylene with Microfibres Formed through Extrusion and Hot Stretching

In-situ composites based on dispersed poly (ethylene terephthalate) (PET) or polyamide (PA),and continuous Polyethylene (PE) were prepared through a single screw extruder of Haake rheometer system with a rod-die relatively small in diameter.The extrudate was drawn at a drawing ratio of 3.1,and then quickly cooled in cold water.The specimens were obtained by injection molding at processing temperatures less than 190℃，far below the melting temperature of PET (265℃) and PA (230℃),which can maintain the solid state of PET and PA microfiber phase in the composites.Morphological observation with scanning electron microscopy (SEM) indicated that PET and PA can more or less form in-situ microfibers at compositions studied (0-20 wt pct PET or PA),and especially,PET and PA were almost deformed into fibers at the concentration of 15wt pct.Eensile strength and especially.PET and PA were almost deformed into fibers at the concentration of 15wt pct.Tensile strength and modulus of the blends reinforced by PET or PA microfibers showed to be increased from the tensile test results.The most noticeable improvement of the tensile properties occurred at 15wt pct of PET in PET/PE system,corresponding to the highest microfiber content,where the tensile strength reached 32.5 MPa,whereas only 19.5 MPa for the pure PE.     

锥形隔板成形模具工艺改进

<正> MONZA50型摩托车消声器总成左右锥体中间隔板零件(图1),材料为08钢,厚1mm。虽产品公差较大,但技术条件要求外观光滑无压痕,有一定困难。     

大型铝制封头的冲压成形

主要介绍为扩大２０００ｔ水压机的使用范围而进行的技术改造以及将其用于φ２８００ｍｍ大型铝制椭圆形封头成功压制的情况。     

摆线齿廓成形磨削的研究

对摆线齿廓的精加工方法进行了分析，提出了对摆线齿廓采用成形磨削，并对解决成形磨削过程中的主要工艺问题进行了探讨，给出了一种简便可行的工艺方案。     

高压开关静触头座成形工艺

介绍了采用冲压－旋压复合工艺成形静触头座的过程。其中包括：变薄旋压成形薄壁筒体，扩口翻边成形法兰，普旋方式成形异形管口等。对主要工艺参数如主轴转速、进给率、旋轮形状、道次变形率、模板形工等作了简要介绍。该成形工艺对同类异形回转体有一定参考意义。     

基于数字图像分析的薄板成形应变场测量方法

对薄板成形应变场传统的测量方法进行了研究。指出了其不足和误差的来源，提出了数字图像分析法测量薄板成形中的应变场，对测量原理，新的测量方法对传统方法的改进，以及如何降低误差进行了介绍，指出数字图像分析法的前景，提出了改进意见。