The effects of stamping process parameters (blank thickness, blank holder force, friction coefficient, die clearance) on the formability of an automobile reinforced plate were investigated. The process parameters are optimized based on the results of orthogonal testing. The optimal process parameters were obtained by simulation result analysis of variance. The accuracy of numerical simulation is verified by the experiment, which provides guidance for the actual production.
With the use of Visual C++ 6.0 programming development tools as the secondary development of Unigraphics NX (UG), dynamic link library DLL plug-ins were created. This paper takes fixed pedestal which is a standard part with assembly level of mold as an example, describing the parametric assembly modeling technology and implementation method of automatic virtual assembly process. The method can improve the design efficiency greatly by changing the related parameters of the parts to regenerate model fast and complete the design as well as assemble of fixed pedestal. It is proved that this method can meet the mould design requirements, and can be expanded and used for parameterized modeling and assembling of other standard parts with assembly level of mold in the practice.
Electro-spark deposition (ESD) is a microwelding process that utilizes short duration of electrical pulses to deposit electrode materials to a metallic substrate. In this paper, taking TA2 bar as electrode, a deposition layer of thickness up to 40μm was built up to on 7075 aluminum alloy substrate by means of ESD. The deposition layer is metallurgical bonded to the substrate. The microstructure, phase composition, and micro-hardness of TA2 coating were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness test. The microstructure of the coating was mainly composed of TiN phase, Al3Ti phase, AlN phase and Al phase. Its micro-hardness reached 295 HV0.05, about 2 times as high as that of the substrate. The hardness at the cross-section of the entire deposition layer showed a gradient distribution.
This paper chooses equal-rectangles dynamic-layout algorithm as die-steel intelligent-layout algorithm, combines with drawing algorithm and .NET visual component to convert three-dimensional entity into two-dimensional model by coordinate rotational projection. We realized intelligent-layout and simulated the process of die-steel cutting in three-dimensional perspective effect. This system offered autonomous-layout mode and intelligent-layout mode. The former simulated the cutting according to producer’s experience. The latter simulated the cutting on the basis of producer’s requirement by intelligent layout algorithm. The application of this system enhances the market competitiveness by increasing the die steel utilization rate and decreasing the enterprise production cost.
According to the analysis of the bent tube's characteristics and the problems existing in the testing fixture design, the design method of testing fixture for bent tube based on UG are presented. The detail steps of the design and the use method for the testing fixture is described by a designing example. With this method, the designer can achieve new testing fixture just through partly modifying the parameters of the existing designing example owing to UG software possessing the feature of parameterized modeling. The design process of testing fixture design becomes easier, more reliable and efficient.
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