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DELTA DOF parallel mechanism based on three basic technology research CNC bench

Author: XueYongHong
Tutor: GaoTieHong
School: Hebei University of Technology
Course: Mechanical Engineering
Keywords: DELTA institutions Three DOF bench Kinematic analysis ADAMS simulation ADSP
CLC: TG659
Type: Master's thesis
Year: 2011
Downloads: 133
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Abstract

The traditional series machine is concerned, it is relatively simple mathematical models and institutions are relatively complex, and for parallel machine, its mechanism is relatively simple but is very complicated mathematical model. In a parallel machine tools, the end of the actuator movement is precise mathematical operations in a complex on the basis of, this new virtual axis parallel machine tool with the traditional structure of the series is completely different, it does not rely on a fixed guideway for tool oriented, instead of using a multi-pole parallel mechanism to drive. Since PKM machine structure is simple, the moving platform, light weight, high degree of modularity, flexibility and strong technical high added value, is widely used in various fields. Therefore, to carry out research in parallel CNC machine tools will have important theoretical significance and practical value. DELTA agency is a parallel mechanism, it belongs DOF parallel mechanism, the moving platform relative static platform to achieve three-dimensional translational. Based DELTA institutions, research a novel three-DOF parallel NC Experiment Station, from an institutional position analysis, singularity analysis, workspace analysis, kinematics simulation analysis, prototype development and CNC system development as well as other aspects of the online debugging systematic research has made some achievements. 1 In this paper, based on bodies of three DOF DELTA CNC bench. Inverse solution through its location analysis to establish the mechanical structure of the kinematic model, and in the position on the basis of positive solutions to get the agency's reachable workspace, the experimental prototype design and production to provide theoretical basis. The parallel bench with three servo motors are driven by the drive arm linkage control three moving platform to realize the motion control, the driving parts are distributed in the static platform, good mobility. 2 Consider the parallel NC Experiment Station structural characteristics, the use of UG three-dimensional model to establish bench and in ADAMS its motion simulation, the knife loci velocity, acceleration and displacement curves were analyzed to verify the reasonableness of mechanism design , improved design for the physical prototype structure provides a theoretical basis. 3 Consider the parallel NC Experiment Station control requirements, development based on ADSP three DOF bench CNC system. The system as the core processor ADSP build a PC ADSP CNC system hardware platform. Host PC using Visual C development software platform that can identify G code and CorelDraw code; lower machine ADSP driver software development using C language to achieve the three motor control linkage; upper and lower machine to achieve real-time communication via RS232 serial port. 4 Based on the above theory, developed three DOF CNC bench physical prototypes, through an online debugging tool to achieve correct processing path, verify the correctness of the subject institutions to analyze the feasibility and CNC systems.

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