Gui Cong Wang

Milling Machine Design Based on Open CNC System

Completed structure of milling machine design based on open CNC system through the combination of multi-axis motion controller and the way of NC embedded PC. The traditional CNC milling machine combined with technology of many aspects of Precision machinery, electronics, electric drive, automatic control, automatic detection, and computer and so on. High-precision high efficiency and high flexibility of the CNC milling machine makes it has more widely applications. But there are some problems, for example, based on the traditional CNC milling system for work-piece processing is also not very convenient, and traditional CNC system must be G code programming first, then process work-piece, in addition, as the closed nature of traditional CNC systems, products of hardware and software of the CNC manufacturers are not compatible, and system’s training and maintenance costs much, we put forward the open CNC system, then we start to research and analysis the Milling Machine Design Based On Open CNC System.

The Design of a Multi-Functional Force Loading Device

As a mechanical component, sensor can detect spatial information. Sensor technology has been widely used in national defense, aerospace, industrial inspection and automated production areas and so on. However, the sensor calibration device cannot meet the demand of the development of the sensor. In this paper, a multi-functional force loading device, which is of good technical performance, reliable operation, wide measurement range and simple measurement method, and a six-dimensional force sensor calibration method are described.

Research on Dynamics Measurement of Piezoelectric Sensor Based on PVDF Films

A new type of upper and lower cover support structure piezoelectric sensor based on PVDF films is designed in terms of piezoelectric effect. Mechanics and mathematical models are established according to the structure of the sensor. The natural frequency of the sensor is derived finally. The natural frequency of the sensor is verified to meet the requirements of dynamic measurements by using theoretical calculations and simulations. The effectiveness of the calculating method is indicated.

Research on Axis Piezoelectric Six-Axis Force/Torque Sensor Clamping Device

Six-axis force measurement and real-time force feedback control is realized the basis of the coordination of multi-equipment operation control and conform control, and is developed the technical basis of overloaded operators equipment and other heavy equipment. A surface friction clamping device which is based on the principle of swelling is designed in the paper, and is used to rigid connection between the six-axis force sensor and parallel shaft. The measuring principle of six-axis force sensor is analyzed. Six-axis force sensor dynamometer performance is researched under the influence of clamping device. Modeling and simulation analysis of the structure is obtained by using FEM and loading experiment is designed.

Simulation Optimization of Multi-Objective Flexible Job Shop Scheduling

Current scheduling approach for multiple objective flexible job shop problem (FJSP) cannot construct a precise scheduling model and obtain a satisfactory scheduling result at the same time. To deal with this problem, a simulation optimization scheduling approach was presented which was composed of two basic modules: the Fast non-dominated Sorting Genetic Algorithm (NSGA-II) module and Witness simulation module. Firstly, a multi-objective mathematical model was found for FJSP and NSGA-II was applied to solve. Then, a set of Pareto optimal solution was obtained by NSGA-II module. In order to select the final solution from the Pareto optimal solution for FJSP, the simulation model was set up by Witness, every Pareto solution was as input for simulation model. Finally, the final solution can be selected according other performance indicators.

The Optimization of Flexible Job-Shop Scheduling Problem Based on NSGA-II

An improved genetic algorithm based on NSGA-Ⅱnon-dominated sorting is proposed to solve flexible job-shop scheduling problem. Makespan and machine maximum load are chosen as objective function to establish multi-objective optimization model. Real encoding and plug-in decoding are used to transform chromosomes and scheduling schemes. NSGA-Ⅱnon-dominated sorting with elite reserved strategy is designed to improve search efficiency, and different strategies for selection, cross and mutation are adopted. The feasibility and effectiveness of the algorithm are verified by simulation and results from comparison with other algorithms.

Genetic Algorithm Design and Simulation for Job-Shop Scheduling Problem

This paper proposes an effective genetic algorithm for the job-shop scheduling problem (JSP) to minimize makespan time. An effective chromosome representation based on real coding is used to conveniently represent a solution of the JSP, and different strategies for selection, crossover and mutation are adopted. Simulation experimental results have shown that the scheduling model using the algorithm can allocate jobs efficiently and effectively.

Structural Optimization Design of Parallel Piezoelectric Six-Component Force Sensor

This paper describes structural optimization design of parallel piezoelectric six-component force sensor. Structure, measuring principle, and load sharing principle are introduced. The influences on load sharing effect of each component of sensor’s structure are researched. Main parameters to influence load sharing effect are obtained, and analyzed by finite element method (FEM). It is clear that the analysis results of FEM are well correspond with the theoretical analysis results. Experiment is designed to verify analysis results. The trend is in consistent with FEM analysis.The paper provides reference basis for design of parallel piezoelectric six-component force sensor.

Engraving and Milling Machine Design Based on Open CNC System

In view of application requirements, control axes, the development cycle and other factors of open CNC machine tools, we consider the modular as the guiding ideology and propose a design method of three-dimensional engraving and milling machine based on open CNC system. In this paper we make a detailed design for mechanism structure and control system. Experiments show that this machine has milling and engraving capabilities, can process metal and non-metallic parts, which is a high efficiency, multi-function numerical control equipment.

Study of Pre-Tightening Force on Piezoelectric Multi-Dimensional Force Sensor’s Measurement Performance

In this paper, the pre-tightening force on piezoelectric multi-dimensional force sensor is researched. Structure of multi-dimensional force sensor and piezoelectric quartz crystals are introduced and analyzed. The relationship between pre-tightening force and measuring range of force sensor is researched. Structural model of multi-dimensional force sensor is built and analyzed by FEM. Horizontal linearity in horizontal direction with different preloads is obtained. In order to verify FEM analysis, a reduced prototype of piezoelectric multi-dimensional force sensor is fabricated. Verification test is designed and made. The research will provide certain reference value for development of piezoelectric multi-dimensional force sensor.