【作者】 田峰；

【导师】 刘昕晖；

【作者基本信息】 吉林大学 ， 机械工程， 2009， 硕士

【摘要】 近年来,工具机的研发和制造一直朝着高速、精密、高效的趋势发展。一般而言,工具机的进给系统主要分为两种:(1)线性马达;(2)伺服马达与高导程滚珠螺杆。配重系统分为质量块配重系统、液压配重系统、高压气体配重系统,以克服重力等因素对主轴在垂直进给方向运动的影响。高压气体配重系统与其他配重系统相比,具有降低工具机进给系统的干扰力和有效提高主轴的定位精度等优势。:本文延续前人研究所提出的主动式高压气体配重方法,建立的实验机台为模拟高速工具机主轴在垂直方向进给的高压气体配重系统,并以线性马达作为致动器,通过对高压气体配重系统的力学模型分析,在线性马达做垂直方向运动的状态下,以伺服阀进行流量控制,调节气压缸下气室的压力,使压力保持平稳,平衡系统的载重,期望能有效降低干扰力对线性马达推力及定位精度造成的影响。相对于传统的高压气体配重系统而言,在主轴较快速度移动时,气压缸的压力会有较大的波动,使出力较不稳定,无法有效降低干扰力。本文使用自动式模糊控制器,应用在主动式高压气体配重系统进行压力控制,有效的降低系统干扰力的影响,提高了主轴的定位精度。更多还原

【Abstract】 Because of air inexhaustible, security, environmental protection, as the actuating medium gas pressure drive technology becomes more and more popular and widely is applied gradually in industry. Since the 70’s, the worldwide energy crisis occurred, so that people are increasingly concerned about energy conservation. Rapid growth in China’s economy today, the development model is still based on consumption of material resources, making resource constraints and the environment has become a major obstacle to economic development, therefore, to conduct research on energy-saving is particularly urgent and important.The gradully integration of gas pressure drive technology with materials, electronics and control technology, making it become one of the main mechanical drive and control technicals.But relative to other transmission technologies, the current gas pressure drive technology has the defect of the lower energy efficiency,therefore,the research on how to save energy and reduce consumption has become an important issue in this field. In addition, the conventional pneumatic counterweight system can appears that the pressure will not stabilize with rather high feeding speed, which still requires further study and improvement.In general, the feeding system of machine tool is mainly divided into two types: (1) linear motor; (2) servo motor and high-leading ball bearing and screw. No matter what kind of feeding system, the feeding of the principal axis in the vertical direction using counterweight system is the essential design. The counterweight systems are divided into the quality block counterweight system,the hydraulic counterweight system, the pneumatic counterweight system to overcome the influence of factors such as weight on the principal axis in the vertical direction of feed movement.Compare the pneumatic counterweight system to other counterweight systems, there are many advantages:(1)Gas pressure drive using air as transmission medium, as a result of air from the atmosphere can be inexhaustible, non-media supply difficulties and costs to be incurred in the issue of media, used air can be discharged directly into the atmosphere and less pollution of the environment, therefore, can simplify the pipeline equipment.(2)The work pressure of compressed air is lower, usually 0.4～0.8MPa. Therefore, the pneumatic components to reduce the material and processing requirements of accuracy, causes that components are easy to manufacture, low cost,simple structure of devices and components, long working life.(3) Faster transmission reaction pressure, rapid action is generally only 0.02～0.03s needed to be able to establish the pressure and speed.(4)Because the air viscosity is very small and the pressure loss flowing in the pipe is rather slight, the compressed air is advantageous for the centralism supply and the long distance transportation.(5)The nature of the air is few influenced by temperature, under high temperature combustion and explosions will not occur,so it is safe to use;When temperature changes,the changes in its viscosity is extremely small,which does not affect transmission performance.(6)Because of gas compressibility, the system is easy to realize automatic overload protection.(7)Pneumatic components to maintain easy to operate,not easy to plug the pipeline,and there is no medium metamorphic, supplement and replace and so on.Therefore, in any modern country,the pneumatic system using compressed air as the actuating medium plays an important role on improving the efficiency in various industrial sectors.This article is a continuation of previous studies of active pneumatic counterweight method, the test to establish their machine to simulate high-speed machine tool principal axis in the vertical direction to the pneumatic counterweight system, and linear motors as actuators by weight of the pressure model of power system analysis, so the linear motor under the vertical direction of movement to carry out servo-valve flow control to regulate the cylinder pressure chamber under the pressure so that pressure remained stable, balanced system load, reduced the effective interference power of the linear motors pushing power and the impact of positioning accuracy.Compared with the passive pneumatic counterweight system (that is, the traditional pneumatic counterweight system), the degree more quickly in the principal axis moves, the cylinder pressure fluctuations can be larger than, using the stability of power than not, can not effectively reduce the interference power. In this paper, the use of self-tuning fuzzy controller, the application of pressure in the active pneumatic counterweight system, to carry out pressure control,expectations can reduce the impact of power system disturbance, and explore the experimental results, respectively.更多还原