Study on the PID control model of numerical control rotary stretch-bending former;
数控转台拉弯机PID控制模型的研究
The model indicates that θ′ phase precipitated from Al-Cu-Mg alloy grows through ledge mechanism and loses coherence.
模型指出:在时效过程中,Al-Cu-Mg合金中析出的θ′相通过台阶机制生长而发生共格失稳,转化成球状的θ相而导致强度显著下降;Al-Cu-Mg-Ag合金中的Ω相由于在界面被Mg和Ag原子覆盖,降低了Ω相的生长速度;同时,Mg和Ag原子在析出相界面的存在降低了晶格畸变能,使得Ω相能够保持片状而不发生共格失稳,高温下具有较高的强度。
Theγ lamella nucleates at grain boundary and growsthrough the ledge mechanism controlled by volume diffusion process.
γ片层的析出是通过在原α或αss2晶界处形核,以体积扩散控制的台阶机制生长,1000℃时γ片层的伸长速度约为(1。
In this paper,the principle and flow of traditional channel-turning mechanism are introduced.
研究了传统换台机制的原理和流程,并指出其不足。
This paper introduces the operation principle and control character of rotating table stretch bending former.
介绍了转台式拉弯机的工作原理及其控制特点,论述了其数控改造后的控制原理及控制系统的体系结构,并详细地介绍了自行开发设计的控制软件的功能、进程模型、控制流程及对象类的结构。
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