超高速磨削用CFRP砂轮研制

发布时间：2018-09-14 10:39

【摘要】：超高速磨削由于其磨削力小、砂轮材料去除率高和改善难加工材料磨削性的特点,对传统磨削工艺带来了革命性的变革,是磨削工艺未来发展方向。针对金属基体砂轮密度大、比强度及比模量较低,导致超高速磨削加工精度、表面质量不稳定的问题,本文结合有限元仿真和磨削性能试验研究工作,设计、并制备适用于超高速磨削加工的轻质碳纤维增强树脂基复合材料(Carbon Fiber Reinforced Polymer,CFRP)基体砂轮,进一步挖掘超高速磨削加工优势。本文主要完成以下几项工作:(1)提出超高速砂轮磨削性能评价要素。采用试验和仿真手段,对不同基体材料的砂轮的磨削性能进行了分析和评价,仿真和试验结果表明,在高速磨削条件下,CFRP砂轮在基体应力分布、径向变形,磨削过程中的磨削功率、磨削振动、磨削力均优于钢基体砂轮。(2)基于高速磨削性能试验研究结果,利用有限元仿真软件,从CFRP砂轮结构对砂轮应力、应变分布、模态及气动特性等方面,对砂轮基体截面形状、铺层方式及节块设计进行优化,设计面向适用于超高速磨削加工的CFRP砂轮。(3)确定CFRP砂轮的制备路线,制备超高速磨削用CFRP基体CBN砂轮。针对超高速条件下离心力对砂轮安全性的影响,对CFRP砂轮进行动平衡调试和安全回转试验,并通过试验分析砂轮基体径向变形,砂轮磨削过程中的磨削功率、磨削振动及磨削力,对超高速砂轮磨削性能进行综合评价。试验结果表明,CFRP砂轮径向变形、磨削功率和振动较小,可以满足超高速磨削加工要求。
[Abstract]:Because of its small grinding force, high removal rate of grinding wheel material and improvement of grinding property of hard to be machined material, ultra-high speed grinding has revolutionized the traditional grinding technology and is the future development direction of grinding technology. Aiming at the problems of high density, low specific strength and specific modulus of metal matrix grinding wheel, which lead to high speed grinding precision and unstable surface quality, this paper combines finite element simulation and grinding performance test to design. The matrix grinding wheel of lightweight carbon fiber reinforced resin matrix composites (Carbon Fiber Reinforced Polymer,CFRP) which is suitable for ultra-high speed grinding is prepared to further exploit the advantages of ultra-high speed grinding. The main work of this paper is as follows: (1) the evaluation elements of grinding performance of super-high-speed grinding wheel are put forward. The grinding performance of grinding wheel with different matrix materials is analyzed and evaluated by means of test and simulation. The simulation and test results show that the stress distribution and radial deformation of CFRP wheel in matrix are obtained under high speed grinding conditions. The grinding power, grinding vibration and grinding force of grinding process are superior to those of steel matrix grinding wheel. (2) based on the experimental results of high speed grinding performance, the stress and strain distribution of grinding wheel is obtained from the structure of CFRP grinding wheel by using finite element simulation software. In the aspects of modal and aerodynamic characteristics, the shape of the matrix section, the layering method and the design of the segment block of the grinding wheel are optimized, and the CFRP grinding wheel for ultra-high speed grinding is designed. (3) the preparation route of the CFRP grinding wheel is determined. The CFRP matrix CBN grinding wheel for super high speed grinding was prepared. Aiming at the influence of centrifugal force on the safety of grinding wheel under ultra-high speed, the dynamic balance debugging and safety rotary test of CFRP wheel are carried out, and the radial deformation of grinding wheel matrix and grinding power in grinding process of grinding wheel are analyzed. Grinding vibration and grinding force are used to evaluate the grinding performance of super high speed grinding wheel. The experimental results show that the radial deformation of CFRP grinding wheel is low, and the grinding power and vibration are small, which can meet the requirements of ultra-high speed grinding.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG743;TG580.2

【参考文献】