【摘要】：超高速磨削由于其磨削力小、砂輪材料去除率高和改善難加工材料磨削性的特點,對傳統(tǒng)磨削工藝帶來了革命性的變革,是磨削工藝未來發(fā)展方向。針對金屬基體砂輪密度大、比強度及比模量較低,導致超高速磨削加工精度、表面質量不穩(wěn)定的問題,本文結合有限元仿真和磨削性能試驗研究工作,設計、并制備適用于超高速磨削加工的輕質碳纖維增強樹脂基復合材料(Carbon Fiber Reinforced Polymer,CFRP)基體砂輪,進一步挖掘超高速磨削加工優(yōu)勢。本文主要完成以下幾項工作:(1)提出超高速砂輪磨削性能評價要素。采用試驗和仿真手段,對不同基體材料的砂輪的磨削性能進行了分析和評價,仿真和試驗結果表明,在高速磨削條件下,CFRP砂輪在基體應力分布、徑向變形,磨削過程中的磨削功率、磨削振動、磨削力均優(yōu)于鋼基體砂輪。(2)基于高速磨削性能試驗研究結果,利用有限元仿真軟件,從CFRP砂輪結構對砂輪應力、應變分布、模態(tài)及氣動特性等方面,對砂輪基體截面形狀、鋪層方式及節(jié)塊設計進行優(yōu)化,設計面向適用于超高速磨削加工的CFRP砂輪。(3)確定CFRP砂輪的制備路線,制備超高速磨削用CFRP基體CBN砂輪。針對超高速條件下離心力對砂輪安全性的影響,對CFRP砂輪進行動平衡調試和安全回轉試驗,并通過試驗分析砂輪基體徑向變形,砂輪磨削過程中的磨削功率、磨削振動及磨削力,對超高速砂輪磨削性能進行綜合評價。試驗結果表明,CFRP砂輪徑向變形、磨削功率和振動較小,可以滿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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG743;TG580.2

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