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Belt for blade machining CNC polishing system research

Author: Shi
Tutor: ZhangQiuJu
School: Jiangnan University
Course: Mechanical Manufacturing and Automation
Keywords: NC Belt polishing Blade polishing Kinematics Modeling Process simulation Virtual Prototyping Virtual Assembly UG / Open_API secondary development
CLC: TG596
Type: Master's thesis
Year: 2009
Downloads: 191
Quote: 9
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Abstract


Turbomachinery in the aerospace, energy and other industries widely used. Its core components leaves because of their special freeform shape, typical of difficult to machine parts. Processing areas in the country in the leaves, with high precision and high efficiency milling in stark contrast to the free-shaped surface of the blade polishing process remain as manual polishing the main stage. With the blade size is increasing, rising production demands, the blade polishing automated machinery has become a bottleneck limiting the production of high-quality blade. Therefore, the development of an economical, efficient, with independent intellectual property rights of blade-shaped surface polishing system to solve the blade machining milling and polishing asymmetry degree of automation of the situation, with practical significance. This article caught in the cutting tool and the workpiece relative pose this crucial factor, drawing belt grinding processing, analyzes and presents the movement of the machine axes and institutions spatial distribution. By analyzing the kinematic model of the machine, put forward the principle of the machine kinematics configuration. By the structure of the machine as a special robot inverse solution of the machine parameters of each joint movement to solve the model no closed form solution of the problem. Propose suitable for multi-axis CNC belt grinding contact wheel control strategies - normal contact method. This method can effectively use structural rigidity of the machine, simplifying machine kinematics inverse solution model calculations and facilitate the realization of the process of grinding the grinding pressure control. In order to take into account the processing of non-interference and high grinding grinding wheel shape made contact with contact wheel drum should be used, and gives a touch reincarnation axis direction and the feed direction of the control strategy. Based on UG secondary development capabilities to the blade CAD model, based on the free surface of the blade through any analysis, each point on the blade to get the exact position coordinates and the corresponding surface normal vector and the curvature of the distribution of information to law as a basis for tool path planning, knife contacts pickup and get cutter location point information. You can also divide the freeform surface machining area to circumvent such blade root, leaf crowns and ribs and other difficult to program machining zone. Provided by UG virtual assembly and motion simulation module, CNC polishing system to establish a virtual machine model and implement a virtual blade clamping on the machine. Polishing process for the removal of material after grinding conditions and the residual height of the simulation, and thus the ultimate precision for quantitative analysis in order to verify the reasonableness of the distribution of the tool path and correctness. Solutions obtained using reverse motion parameters to drive the virtual machine movement joints in all, we can observe the whole machine in motion between the moving parts will interfere, and use the interactive mode of cutter location file for errors and make timely tool path adjustments and modifications to ensure a reliable tool position information.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Grinding and grinding machine > Process control of grinding machines and CNC grinder
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