Advanced Materials Research Vols. 941-944

Abstract: Measurement of parallelism error is one of important icon in the measurement of orientation tolerances. This paper presents new method of parallelism error measurement and is based on the flatness plane using minimum zone technique. Real coded genetic algorithm has been proposed to determine the flatness plane coefficients and flatness error. Flatness plane has been developed using plane coefficients and then parallelism error has been determined from the flatness plane. One example has been presented to show the effectiveness of the proposed parallelism error measurement method. The result of the proposed method has been compared to co-ordinate measuring machine (CMM) built-in function for parallelism error measurement and the results are in good agreement. In addition to determination of parallelism error measurement, the proposed algorithms also calculate flatness error and can also be extended to measurement of other types of geometrical tolerances with slight modifications.

Abstract: In this paper, a new method is presented for the identification of machine tool component errors. Firstly, the Non-Uniform Rational B-spline (NURBS) is established to represent the geometric component errors. The individual geometric errors of the motion parts are measured by laser interferometer. Then, the volumetric error for a machine tool with three motion parts is modeled based on the screw theory. Finally, the simulations and experiments are conducted to confirm the validity of the proposed method.

Abstract: A virtual instrument (VI) for measuring the coating thickness of brushplating has been developed; and then the analysis of the main uncertainty sources of the instrument has been presented, including the uncertainties of the transducer, the A/D convertor, and the DSP. Moreover the combined measurement uncertainties of theese four bocks have been estimated respectively according to Type B evaluation of “guide to the expression of uncertainty in measurement (GUM)”[1] in terms of Gram-Chariler series, while their corresponding relative measurement uncertainties have also been given. Finally, the overall relative uncertainty and the combined uncertainty of the instrument have also been provided.

Abstract: Measurement of geometrical tolerances is one of the prime processes in manufacturing for ensuring the quality of the machined components. Manufactured components are sent to assembly line based on measurement reports, so measurement is inevitable in any production setup. Flatness error is one of the important icons in the crew of geometrical tolerances; if unqualified components are sent to assembly line, the components may not function according to the design requirements. This paper presents real coded efficient genetic algorithms (EGA) for flatness error measurement and flatness plane development using minimum zone method. Flatness plane has been developed by determining the flatness plane coefficients. The flatness plane coefficients determine the orientation of the surface. The proposed algorithms are equipped with high precision, accuracy, good repeatability and fast mature convergence rate. The algorithms characteristics like precision, accuracy, repeatability ensure the reliability of measurement results of measured component and fast mature convergence rate ensure the reduction in the inspection time.

Abstract: With the initial permeability testing technique, early evaluation on stress concentration and fatigue damage can be realized by measuring initial permeability of the ferromagnetic material. The variation of detection signals with initial permeability is researched via the ANSYS FEM simulation and the tensile testing of 45 steel. The results indicate that the detection signals have a linear relation with initial permeability of the ferromagnetic material. It is seen that initial permeability testing technology can give effective and accurate evaluation of the ferromagnetic material.

Abstract: In view of the existing problems of indirect position closed-loop control, a digitized closed-loop control method is presented and a new kind of position control system with fully digitized closed-loop based on that method is developed. In this way, the fully digitized control of cutter trajectory is implemented with the features of digitized driving, digitized measuring and digitized position control, so that the machining accuracy of the NC machine tools is effectively assured. This system has been used on varieties of NC machine tools and very good results have been obtained in the machining of complex precision parts.

Abstract: Edge rolling in roughing area of continuous hot strip rolling is a basic method of controlling slab width. Edge rolling will induce dog-bone, width loss and fish tail at head and tail ends of slabs in unsteady deformation zone. A 3D elastic-plastic FEM model for roughing stage of continuous hot strip rolling was established and research on the influences of those technical parameters such as slab width, thickness and reduction of edging roll on unsteady deformation of metal was carried out. The research work provides a scientific basis for the optimization of edge rolling schedule.

Abstract: In order to analysis the processing performance of the CNC grinding machine, the master profile error distribution characteristics of gear grinding tooth error analysis method based on statistical process control techniques. Tooth profile error topology control charts, analysis of the tooth length direction and the tooth height direction of the error distribution, respectively, corresponding to establish the mean - range control chart. Control charts to achieve real-time distribution of the gear grinding process tooth profile error, error change trend analysis and prevention. Calculate the machine's process capability index, derived CNC grinding processes. Finally, analysis the main causes of tooth profile error and take appropriate measures to reduce the tooth profile error by the cause and effect diagram.

Abstract: Hydraulic automatic gauge control press system is one of the key techniques of modern rolling mills. Its mathematical model is important for directly determining the quality of cold rolling strip. The sketch of hydraulic automatic gauge control press system is built. The six components of hydraulic automatic gauge control press are present, and the mathematical model of each componets is built, then, the mathematical model of hydraulic automatic gauge control press system of rolling mills is built too. Finally, it is validated by simulation based on the established model and application of real data.

Abstract: Here computational models of contact of elastic systems with the contact finite elements (CFE) in a 2D or 3D frame-rod systems are reviewed. The solution is based on the method of the step-by-step analysis taking into account the character of loading, the complicated conditions of the contact and other factors consideration of which approaches the calculation circuit of the task to the real operating conditions of any structures or construction