Key Engineering Materials Vols. 392-394

Abstract: This paper presents a new kind of multi-axis electro-discharge machining (EDM) computer numerical control (CNC) system which is based on RT-Linux platform. Binary kernel structure of EDM CNC System is proposed to handle real-time task and time-sharing task separately. The system is divided into three parts: CNC kernel module, CNC driver module and CNC user module. CNC kernel module implements CNC control function in of the software system, and implements the move control to the NC machine. CNC driver module is just as device driver level. CNC user module is user manage procedure. The experiment of rimed turbine blisk validates the performance of the system. The performance implied that the system is real-time, stable and reliable.

Abstract: Based on reviewing the applications and machining of the stainless steels, the cutting performance of the austenitic stainless steel 1Cr18Ni9Ti is analyzed through the contrastive experiments. This paper studies drilling minipore mechanics of hard-to-cut material—Austenitic Stainless Steel 1Cr18Ni9Ti by simulation and experiment, analogy results displays the trend that drill thrust, torque and temperature changed with amount of feed, it matches with test result in the same cutting condition well. The research results would be of great benefit for the selection of proper tools and cutting parameters in drilling austenitic stainless steels.

Abstract: ObjectARX is a development technology of AutoCAD based on MFC. The developed ARX program can do the job like finishing the drawing automatically and creating a swept-solid modeling. The general modeling software, such as Pro/Engineer, can not create a swept-solid with 3D solid or surface. The profiles of the parts may be expressed by some equations like spur gear, while others may be not like bevel gear and space cam. In this paper, a solution for the development of part without accurate profile equation by using the ARX technology is investigated. With the help of the ARX in AutoCAD, the related entities in the database to do some Boolean operations are manipulated and the swept modeling is created. As the examples, the 3D solid model of a gear and a cam is built to demonstrate the use of the method. The limitation of the method is also discussed.

Abstract: In order to improve NC machining precision this article analyzes the effects of cutting force on NC machining precision by means of simulation, and builds up the mathematical models of CK7815 feed drive system and radial action force of cutting feed, in order to study the effects of cutting load torque and radial cutting force on work pieces processing precision. The simulation results illustrate that cutting load torque and radial cutting force have respectively effects on axial precision and radial precision of work piece. The bigger is cutting load torque, the bigger is axial error. The smaller is cutting process coefficient and the higher is converting spring stiffness of lathe and tool, the smaller is radial error. In practice NC machining precision is improved by trying to decrease the cutting load torque and cutting process coefficient and increase converting spring stiffness.

Abstract: Wavelet analysis was applied to detect the greatest deviation from the perfect circle for the roundness and cylindricalness of shaft-like components in the virtual manufacturing engineering. Based on the concepts of the roundness and cylindricalness, the least square method was adopted into the determination of the reference—the least square circle from which the deviation was calculated. In order to obtain the extremum of the errors, wavelet transform was carried out with binary wavelet from the time domain to frequency domain. A virtual probe was used to have the signals for the measured point by using WTnode_gettranslation() function. The accuracy of the measurement depends, to a large extent, on the length of individual step along the axis and the density of the measured points on the sections. Experiments have shown that the measuring processing was time-saving and the results from the wavelet analysis were much reliable.

Abstract: In the automatic assembly of product, the key steps are to automatically get constraint objects and plan the assembly path. For the assembly module of UG, the constraint object is not to be gotten automatically, and the assembly path is planned manually. The algorithm to automatically get object occurrences is proposed to plan the assembly path, and the limitation problem of the existing automatic assembly is solved too. The automatic assembly module is developed in UG by adopting the further development tools. This software can implement the automatic assembly of rapid fixture. The feasibility of the proposed method is verified by operating the typical example in the software.

Abstract: This paper researched the film-precision potentiometer resistance, the development of its linear measuring and amending automation system, the application in aerospace field. The system with the X-Y table in the use of self-developed resistance to probe linear measurement, in the computer control of the special carved header of the sophisticated detection of potential amendments to meet the requirements of its linearity error. The entire process of measuring and repair inscribed industrial control computer supported by self-developed special software measurement and repair inscribed automatic, and fully automated, with high precision and high efficiency characteristics.

Abstract: According to the requirement of NC lathe in green redesign, today’s NC lathe redesign and analyze are put up. CKA6150 NC lathe is redesigned. The green indices are established. A method is used to estimation and analyze in CKA6150 redesign scheme. The result indicates that the new scheme is prior to the old one, and meets absolutely the requirements of the green redesign.

Abstract: To prevent or reduce the formation of burr efficiently in metal cutting, it is necessary to reveal the burr formation mechanism. A finite element model of cutting-direction burr formation in orthogonal machining was presented in this paper. The simulation of the burr formation process was conducted. Undeformed chip thickness, rake angle, rounded cutting edge radius and workpiece material were included in cutting conditions, whose influences on burr formation were investigated, according to the simulation results. By comparing the results of the simulation and the experiment, good consistency is achieved which proves that the finite element model of burr formation in this paper is significant and effective to predict burr formation.

Abstract: Structure and working principles of eddy current retarder (ECR) are discussed, as well as performance requirements of real-time virtual testing and simulation. On the basis of hardware testing platform, virtual models of vehicle and retarder are embedded into application program. In the testing system, Vega API function library is used for second development to control the 3D models, and Visual C++ is used for mathematical models call from MATLAB to simulate the working condition. Integrated with virtual instrument and virtual environment, the limitation of former simulation is broken through. Monitoring and testing on eddy current retarder are achieved efficiently and visually. Besides, the virtual test data is not only compared with the practical vehicle test data to correct the technical parameter of eddy current retarder, but also compared with the simulation of mathematical models for further study. The testing system gives evaluation on the performance of the retarder in different vehicles, so it expands application range and heightens testing efficiency.