Key Engineering Materials Vols. 392-394

Abstract: In the process of the ultrasonic machining, the machining efficiency is affected directly by material removal rate. In the paper, the material structure deformation under abrasive impacting is simulated by the LS-DYNA3D software, and the stresses occurring are analyzed numerically. In addition, the effects of some machining parameters on the amount of the material removal are investigated by the experiments.

Abstract: By the help of professional CPLD software/hardware development tools like PLD carrier and MAXPLUS, this paper successfully put forward the objective device—Electrical Pin Selection Controller in Circular Weft Knitting Machine, which covers the primary aspects of expected inputs, electrical simulation and verification, programming and downloading, etc. Details have been given on how to apply CPLD in the pin selection controller design. Moreover, introductions have been given to the pin selection mechanism and the design schema.

Abstract: Discussed examination and approval flow technology of CAPP system. It can improve capability of the Concurrent Process Planning System (CPPS) and reduce technologist labor intensity of writing technical documents. Introduced establishing method of userinfo in PDM, and then explained how to link the userinfo table with overall process information table by using database technology, and introduced how to use the userinfo database to realize examination and approval flow in CPPS.

Abstract: During the process of interrupted cutting, milling insert suffers from periodic thermal shock. The bad temperature field caused by cutting heat is the direct reason for tool failure. In order to get more accurate temperature field distribution of milling insert, the experimental research on temperature field is carried on with the FLIR infrared thermal imager. This paper takes hard cutting material 3Cr1Mo1/4V as example. Through the contrast experiments, the temperature field distribution of tool-chip contact area is gained at the moment of milling insert going into or out from the workpiece, and also the difference of failure modes among different milling inserts is revealed. The experimental analysis results show that more accurate distribution of temperature field will be obtained when we apply the infrared thermal imager to observe temperature field during interrupted cutting process. Optimization design for groove of milling insert also can be based on those results.

Abstract: Some key techniques such as material constitutive model, friction characteristics at tool-chip interface were discussed. And the constitutive equation for nodular cast iron 500-7 was established. Then the simulation software DEFORM-2D was used to simulate the orthogonal cutting process. Finally, the influences of cutting parameters and tool geometries on cutting forces, cutting temperature and chip morphology were analyzed. This study provides some academic support to the optimization of cutting parameters for nodular cast irons.

Abstract: Contour extracting plays an important role in image processing and computer vision, and it’s one of the most important components in low level processing. Based on many tests, this paper applies hue and texture as feature combined with mathematical morphology to have a rough segmentation of homogeneous objects, then restores the obtained contour based on h component. Tests prove that acceptable contour can be obtained. Compared with traditional method of contour extracting, the algorithm mentioned here includes self-differing, contour restoring based on hue and so on, so it has better robustness to light variation.

Abstract: This paper used digital image technology to detect surface defects of steel ball, and designed mechanism body and the corresponding control system. In order to improve the poor control effect of basic PID, we put forward modified PID control strategy, combining speed-variable integral, differential, and anti-saturation integral, then realized optimum design for PID parameters. The experimental results indicated that PID control strategy in the paper based on optimizing parameters had a maximum output at the initial time interval, so that the response speed of system would be much higher, and the adjusting time would also be shorter.

Abstract: Cutting temperature measurement and its variety tendency can reflect cutting tool performance and machined surface quality directly. By means of a mercury current collector or an electrical brush device the online measurement of thermoelectric potential of tool-workpiece natural thermocouple in milling is obtained, based on which a new cutting process real-time monitoring system is developed. The system takes the average cutting temperature in tool-workpiece interface as the monitoring target and the rotation rate of machine spindle as the adjustment object, which leaves out onerous and complex modeling and makes the monitoring and adjustment objective, direct and effective.

Abstract: Using the advantages of integration technique based on Web Services, a CAx/PDM integration framework was constructed to realize the integration of PDM and other application systems. With the framework, the encapsulation of PDM function modules based on .NET Framework was achieved, a dynamic integration method of PDM and CAx systems was provided, the middle format of exchanging data for PDM and other application systems was represented by the XML( Extensible Markup Language) schema to share the information of enterprise application systems. The proposed integration technology can be effectively used to CAx /PDM integration, and meets the manufacturing enterprise's requirement on integrating application system suitably.

Abstract: Quality control is very important in the manufacturing process of cold tube-bending, but most of enterprises can only verify tube quality by the tube bending machine. Based on the platform of commercial software, an integrated system on CAD/CAPP/CAE for bending tube in power plants boiler is developed. The system is carried on re-development under the VC++ language environment, and data is transferred in Pro/E, Ansys and designing module through a reasonable data structure and interface. So we can share data and realize flexibility and standardization of the processing. The application result indicated that the integrated system can offer a whole set of solution from building a CAD model, forecasting tube bending quality and structure optimization by CAE methods to programming CAPP processes.