一、前言 70年代出现的针式打印机,由于结构简单、体积小、速度高、成本低,且能同时拷贝多份的特点,在我国打印机市场上独占鳌头,应用十分普遍。打印机中的打印针是打印机中的关键另件,但又是易损件,故打印针应具有高的耐磨性和刚性。打印针在打印过程中主要存在两个方面的磨损,其一是长度方向的磨损,包括针与纸、色带的冲击磨损,主要是针与色带的墨水微粒磨损;另一种磨损是指针的径向磨损,这主要是针与导针板之间的磨损。我们采用 I. Preface The dot matrix printer appeared in 1970s is very popular in our printer market due to its simple structure, small size, high speed, low cost and the ability to copy multiple copies at the same time. The print pin in the printer is a key component of the printer, but it is a consumable, so the print pin should have high wear resistance and rigidity. Print pins in the printing process there are two main aspects of wear and tear, one is the length of the wear and tear, including the needle and paper, ribbon impact wear, mainly needle and ribbon of ink particles wear; the other wear is the pointer The radial wear, which is mainly between the needle and the needle plate wear and tear. We use