Zhong Qi Sheng

Research on Conceptual Design of Product Service System Oriented on CNC Machine Tools

Researched the conceptual design of product service system (PSS) oriented on CNC machine tools. Centered on acquisition and analysis of the customers need, and its transmission and distribution to PSS project characteristics of CNC machine tool, the paper proposed an integration method of QFD and TRIZ to help the designer to develop PSS solutions to meet the customers need. This study established a new design system and methodology for PSS conceptual design, which built a theoretical foundation for the further research in this field, and also provided technical support for transmission and distribution of the customers need, configuration design and PSS project decision-making. This method was applied in a PSS case of CNC machine tool to test its effectiveness.

Research on Thermal Characteristic of Spindle System of CNC Machine Tool

The main heat source of the spindle system of CNC machine tool has been analyzed. The friction heat of the motor as well as the bearing has been calculated. This paper established the finite element model of the spindle system of a precise CNC turning center, and used ANSYS to analyze the steady temperature field of the spindle system and the thermal deformation of the spindle. Finally, this paper proposed a solution to install a cooling sleeve in front of the spindle box, which can apparently reduce the thermal error of machine spindle.

The Monitoring of CNC Machine Processing Condition Based on the BP Neural Network

As an example for the test of built monitoring system, the experimentation was carried out to monitor the condition of tool wear, which related with the machining process closely. In pattern recognition, using the nonlinear mapping function of neural network, a three-layer BP artificial neural network was selected to carry out the mapping between the processing status and related signal features. In this way, the monitoring of machining processing was implemented. The Matlab Script node of LabVIEW software was used to call the neural network package of Matlab, which reduced the program development cycle and increased the reliability of the program. According to the cutting experimentation of the finger milling cutter, it is verified that BP artificial neural network can effectively recognize the tool condition and accomplish the wear prediction.

Assembly Unit Division Method Based on Connection Strength

Through analysing the assembly relation between the product parts, this paper divided the product parts into function parts and the connectors. Then the simplified assembly semantic relation graph model was established in this paper. The concept of assembly connection strength was introduced to express the complexity of assembly between the parts. Using the least assembly time as the goal to determine the optimal unit division number, the assembly unit division was accomplished based on the connection strength. Finally using the spindle box of HTC2500hs as an example to check this division method, the results show that this method has applicability and effectiveness.

Virtual Prototype Modeling of Biped Robot with Heterogeneous Legs

Biped robot with heterogeneous legs (BRHL) can simulate amputees dressed with intelligent above/knee (A/K) prosthesis and can be used to evaluate intelligent prosthesis (IP) performance. First the concept of virtual prototype technology and BRHL is introduced. Then virtual prototypes of BRHL mechanical system, ground environment, perception and control system are established. In the end, the continuously walking simulation of BRHL based on virtual prototype is done. The research indicates that virtual prototype modeling based on Pro/E, ADAMS and MATLAB/Simulink is feasible.

The Evaluation and Algorithm of CNC Machine Tool Module Combination Configuration Program

Modular design is an effective design concept and method that adapts to fierce market competition and versatile customer requirement. Solving the key questions in applying modular design method is the important research topic of modern CAD technology. This paper studies the evaluation question of module combination program, and puts forward the evaluation model for CNC machine tool product. Analytic hierarchy process is used as the evaluation algorithm of combination program. The actual evaluation is carried out to verify the model and algorithm.

Study on Simulation Analysis of XXX Machine Cutting Chatter

According to regenerative chatter theory, this paper abstracts the machining process of XXX machine as a mathematical model firstly. The main process is end milling, so this paper abstracts the machine as an end-milling mathematical model, a delay motion equation with 2-DOF. All parameters of this equation can be acquired by modal analysis. Then SIMULINK model is created based on the mathematical model. According to the response characteristics of simulation analysis system, the method of determining threshold of steady area is acquired.

Research on Thermal Characteristic and Thermal Compensation Technology of Spindle System of CNC Machine Tool

The paper mainly studies the thermal characteristic and methods of thermal compensation of the spindle system of a precision turning center. The three-dimensional model of spindle system is constructed and meshed by ANSYS Workbench. The boundary condition and heat source of the spindle system are computed by relevant theory and the results are applied to the finite element model. By comparing results of FEM and experiment, the boundary condition is adjusted if necessary to make the analysis results be similar to experimental results. Then the temperature field is used as a load to calculate the thermal deformation. Two ways of changing boundary condition of spindle system have been analyzed to find their influence on spindle thermal deformation, which are changing air flowing speed around headstock and setting up a cooling jacket at the front surface of the headstock respectively.

Characteristic Analysis and Optimization of CNC Machine Tool Spindle Based on Finite Element Method

Relying on HTC3250µn and HTC2550hs high-speed precision CNC turning center, this paper analyzes the static and dynamic characteristics of CNC machine tool spindle with finite element analysis software. Based on the results and using ANSYS software, this paper considers the volume and amplitude of vibration model as the objective function to optimize the size of the spindle. According to the optimized size of spindle, this paper analyzes the static and dynamic characteristics of the CNC machine tool spindle again and concludes the optimization results.

Research on Module Selection Method in the Modular Design of CNC Machine Tool

In modular design of product, seeking the optimal matching module and realize the optimal combination of product configuration is very important. This paper analyzes the module selection strategy in modular design of CNC machine tool, give the module selection algorithm. Relevant theory of fuzzy similarity optimal ratio is introduced on the search for the optimal matching module, and module selection system is developed by MATLAB. Finally, through an example, prove the effectiveness of the proposed algorithm and convenience of module selection system.