硬质合金耐磨零件的压制和成形

硬质合金压制和成形的设计通常是根据切削或压制成形和预烧结 (加热到脱除成形剂 ,然后局部烧结 )材料而进行的。这种“半成品”(实际为灰口 )材料尽管相当脆 ,但由于硬质合金具有耐磨蚀性 ,所以更适宜用金刚石刀具在相当大的设备上进行大规模切削、铣削或车削加工。预烧结过程中 ,较少或无收缩发生。一些生产厂商已发现甚至不需要成形剂或预烧结 ,简单的压制件致密良好 ,使完整的成形件可以得到加工。尽管作者在几个生产厂家已经看到了这种方法正在实施 ,并且该方法还具有很多显著的优点 ,但是大多数生产厂商仍然认为这不太可能或者不可行…     

新型DVR渐已成形

随着新的数字技术使以前被认为是便利性的特点，变成了基本而必需的特性，这就使得DVR已经变成市场的主流，虽然仍然采用的是磁性存储，但数据被压缩在高容量的硬盘中。     

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.     

四柱式液压拉深机参数的快速确定方法

对快速确定液压拉深机力学参数、运动学参数和几何参数方法进行了系统的讨论,以便于液压拉深机用户可以方便快捷地根据拟开发的新产品,快速合理地确定液压拉深机参数及正确选用机型.     

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。