【作者】 肖永飞；

【导师】 唐宗军；

【作者基本信息】 沈阳工业大学 ， 机械电子工程， 2005， 硕士

【摘要】 异形螺杆数控加工程序编制时,由于异形螺杆的几何廓形复杂,切削用量难以计算。目前,还没有此类工件切削用量的计算方法,因此编制数控程序时的切削用量只能凭经验或参考切削用量手册,使得包络法难以充分发挥其加工效率。 本文针对异形螺杆加工特点,建立了异形螺杆铣削过程迭代学习控制系统。通过检测主轴电机的功率信号并把它作为控制目标,按照所设计的控制律调整切削速度。实现了在满足工件表面质量的前提下提高加工效率的目的。 异形螺杆加工过程中,工件端面廓形的基本特点决定了反映切削状态的物理量,如切削功率、振动和噪声等,呈周期性变化,从而使得迭代学习控制能够在加工过程中得以实现。本文在分析对比各状态信号后,提出用切削功率信号作为状态量以检测加工过程的变化。该信号检测方便,易于在生产实践中实现。 文中分析了异形螺杆加工过程中工件表面质量、切削功率以及进给速度三者之间的关系,并论证了通过对加工过程中进给速度的调整来提高异形螺杆加工效率的可行性。在此基础上将迭代学习控制思想和控制策略引入异形螺杆控制系统,采用该控制系统对异形螺杆铣削过程进行控制,达到了令人满意的控制效果。 本文建立的迭代学习控制系统是在工件表面质量和主轴电机额定功率双重约束下对进给速度加以确定并进行优化调整,它有效地提高了异形螺杆的加工效率,且该系统适用于各种廓形异形螺杆的加工过程。此系统是将迭代学习控制运用到异形螺杆控制系统的一次尝试,是异形螺杆加工过程控制领域的一次新探索。更多还原

【Abstract】 Because the geometrical shape of the special spiral rod is complicated, it is difficult to calculate the cutting width and thickness in the process of manufacturing a special spiral rod. At present, there is no calculation method for this kind of work piece’s cutting quantity. So when a numerical control program is being made, the cutting quantity can only be decided by experience or according to the cutting quantity handbook. This prevents the envelope method of processing special spiral rod to show its high efficiency fully.In this paper, according to the characteristics of the special spiral rods’ processing, the feasibility of adjustment of the feed velocity has been justified and iterative learning control system has been established. Through measuring the signal of the spindle motor’s power, which is regarded as the control object to adjust the feed velocity in the NC program, the efficiency has been improved according to the control rules with the cutting precision satisfied.In the process, because of the shape of the work piece, the signals, which can indicate the cutting state, such as cutting power, vibration, and acoustic emission, change periodically; so iterative learning control system can be applied in this process. After all kinds of signals have been analyzed, the cutting power is chosen to inspect the process. The cutting power is easy to detect and implement in practice.The relationship of the cutting precision and the main spindle motor’s power and the feed velocity in the process has been analyzed in the paper and the feasibility of improving the efficiency by adjusting the feed velocity has been justified in the process of milling special spiral rod. On the basis of analysis above-mentioned, the control thoughts and method of the Iterative Learning Control system have been applied, and a system with one input and one output was designed, it has been proved that using this system to control the process of manufacturing a special spiral rod can gain satisfied effect.The iterative learning control system established in the paper is to quantify and adjust the feed velocity with respect to the cutting precision and the rated power of the main spindle motor constraint. It can improve the efficiency availably and it can be used in the process ofmanufacturing the special spiral rods with all kinds of shape. The control system made an attempt to apply iterative learning control to the iterative learning control system in milling special spiral rod and it is a further exploration in the field of control of processing the special spiral rod.更多还原