Soundless pressing cnc makes the punch , driven by hydraulic pressure , shift during the work cycles to achieve the process of soundless press , that is to say , the punch die gets close to the material fast , and it penetrates the material till the material breaks , then the punch springs back quickly to reduce noises and vibration and assure the high production efficiency at the same time 静音冲压cnc控制液压驱动的冲头在工作循环中变速,实现静音冲压,即凸模快速接近材料,接着缓慢进入材料直到断裂完成,然后冲头快速返回,以减少噪音和震动,同时保证了较高的生产效率
This paper analyses the engineering feasibility of using the static fem in the fatigue strength design of the shipunloaders structure through discussing the difference of infinite fatigue life design and finite fatigue life design and puts forward the calculating work cycle of this structure after considering the shipunloaders work process . it is useful for crane design - engineer to introduce the general fatigue strength design processes of the shipunloaders 分析了有限寿命疲劳设计和无限疲劳寿命设计的异同，研究了用静力学的有限元法进行结构的疲劳强度设计的技术可行性问题；并结合装卸桥的工作过程，提出了相应的计算工作循环；介绍了装卸桥疲劳设计的一般步骤
Space camera consists of camera lens , shut , camera body , film transport system , control system and so on . film transport system as one of the most important components , requests large capacity to carry film , short circle working period , and high dependability . so film transport system ' s well or poor quality directly affect space camera ' s function 航空航天相机一般由镜头、机身、快门、输片机、相机控制系统等部分组成，其中作为成像的重要组成部分之一的输片机构，它要求载片量大、工作循环时间短，高可靠性的工作，因此输片机构的优劣直接影响到整个相机的工作性能及功用，合理设计开发高品质的输片机构具有非常重要的意义。
