Papers by Author: Gang Liu

Abstract: The concept of multi-constrained analysis of the cutting process is presented for the first time in the paper. The paper adopts a method to solve an important problem which is how to judge the influence of constrains during the cutting process. The research results are applied for HSS drills for cutting stainless steel. On the basis of the multi-constrained analysis combined with methods of simulations and standard experiments, the optimum methods are provided for structure, coating and cutting parameters of cutting tools. For geometric structure of tools, optimization is to increase thickness of cutting and rake angle. Coating optimization strategy is choosing high temperature hardness and low thermal conductivity coating. Optimization of cutting parameter is to adjust feed fate, then select proper cutting speed. The conclusion of paper is helpful for the cutting optimization.

Abstract: According to the principle of induction heating, the skin depth of shrink-fit chuck is determined and the mathematical model of induction heating is constructed. Then a finite element model of induction heating for shrink-fit chuck based on FEM software is set up and the electromagnetic field, temperature field and structure field are obtained. In the end, the paper discusses the influence of the position, current frequency and current density of the coil on the deflection of the clamping bore. Research work provides a theory reference for the design of shrink-fit tool holder and shrink-fit machine.

Abstract: Based on finite element analysis, the static transmitted torque of Hydraulic Expansion Toolholder is validated. When Hydraulic Expansion Toolholder is on the static state, the article does the analysis of the contact region deformation and contact stress under different structure sizes. The calculation and the analysis results can provide theoretical guidance for Toolholder application and structure design.

Abstract: Considering the difficulty in identifying the tool system in the process of tool management, this paper proposes a design of toolholder identification system which is capable of storing all tool date using commercially available radio frequency identification (RFID) tags. The system is composed of radio frequency electronic tags, ultra high frequency reader and computer identification system. The paper gives the hardware and software design of toolholder identification system.

Abstract: Due to particular structural design, the error of manufacturing and other factors, the tool system will have more or less residual imbalance. The spindle-tool system’s vibration signals and its frequency response structure were made as reference under the testing of machine raising speed idle running, firstly the tool system’s amount of imbalance was adjusted with the aid of the special balancing ring, then the spindle-tool system’s vibration characteristic was obtained under various amount of imbalanced in idle running condition, finally making use of frequency spectrum analysis the influence of unbalanced quantity to spindle-tool system’s vibration characteristics was studied and compared, the results and the researching approach can help to find the rules about the influence of tool system imbalance to its vibration characteristics in higher speed condition.

Abstract: With the rapid development of manufacturing technology, high speed, high efficiency and high performance have been the characteristics of metal cutting. And cutting technology has been faced with a lot of opportunities and challenges. But at the same time, cutting parameter optimization has gradually been one of the most outstanding bottle-necks that restrict the rapid enhancement of cutting technology. Since the essences of cutting process, such as cutting force and temperature, are invariable, force and heat constraint are performed here to optimize milling parameters of titanium alloy. Influences of cutting edge strength and cutting temperature on milling parameters are analyzed. Finally, feasible region of milling parameters are obtained.

Abstract: In this study, an integrated methodology combining computational modal analysis, experimental modal analysis, and computational dynamic analysis was developed to investigate unbalancing dynamic responses of high speed machining tool systems. A linear-elasticity formulation based on the finite element method (FEM) was employed to compute the natural frequencies and obtain the corresponding modal shapes. Experimental modal analysis was then performed to verify the natural frequencies. After the validation, the FEM model was further modified to predict the dynamic responses, with an HSK (a Germany abbreviation of Hohl Schaft Kegel) tool system as a model system. The results indicated that, by validating the computed natural frequencies with experimental ones, an effective simulation model can be established for predicting complex dynamic response of high speed machining tool systems.