توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱شبیه سازی عملیات فورج دقیق قطعه کلگی پلوس با استفاده از روش عددی حجم محدود
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۹
A constant velocity joint is an important load – supporting part in cars. Its geometry is very complicated and its required precision is high. The key point of outer race is performing the geometry of ball groves with negative slope angle. Usually these grooves performed after forging operation , with machining . that couse relatively high cost. in order to reduse production cost, precision forging sequense of outer race is designed . and simulated using FVM method . the operation has three stage. For verification the results have compared with past researches done in this field.

۲A GA–Based Optimized Fault Identification System Using Neural Networks
نویسنده(ها): ، ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۹
This paper presents an optimized gear fault identification system using Genetic Algorithm (GA) to investigate the type of gear failure of a gearbox system using Artificial Neural Networks (ANN) with a well–designed structure suited for practical implementations due to its short training duration and high accuracy. Slight–worn, medium–worn, and broken–teeth of gears are categorized as gear faults. Wavelet analysis which is implemented for non–stationary signals, is capable of providing both time–domain and frequency–domain information simultaneously and therefore recognized in this research as the most reliable signal analysis method to extract a feature vector to train ANN using normalized wavelet packet energy rate index of the vibration signal. GA was exploited to settle on an optimized system by determination of best values for wavelet function type, decomposition level and number of neurons of hidden layer leading to a high–speed, meticulous two–layer ANN with a particularly small size.<\div>

۳Dynamic Force Model for 3– Axis Ball–End Milling of Sculptured Surfaces
نویسنده(ها): ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۴
Dynamic force model is used to estimate cutting forces of sculptured surface considering dynamic characteristics. Two programs were used for calculations, “ACIS” the 3–D geometric modeler and “VISUAL BASIC”. Two programs were edited and used to preform the calculations, the scheme program to model the work piece ,tool and cutting edge and to obtain the geometric data and the VISUAL BASIC program designe to use ACIS geometric data to calculate the cutting forces. The engaged part of the cutting edge and work piece is divided into small differential oblique cutting edge segments. Friction, shear angles and shear stresses are identified from orthogonal cutting data base available in literature. The cutting force components, for each tool rotational position, are calculated by summing up the differential cutting forces. The machine tool was modeled by a two degree of freedom mass, spring and damper vibration system. Laboratory tests were conducted to verify the pridictions of the model. The work pieces were prepared from CK45 steel using an insert type ball–end cutter. No coolant was used in any of the experimental works. The cutting forces predicted have shown good agreement with experimental results.<\div>

۴Feed Rate Optimization for 3–Axis Ball–End Milling of Sculptured Surfaces
نویسنده(ها): ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۴
The aim of this research is to improve the productivity of CNC machine tools by optimizing feed rate. To optimize feed rate two programs were used, ”ACIS” (with scheme language) and ”VISUAL BASIC”. The scheme program for modeling the work piece, tool, cutting edge and calculating maximum cutting force and the VISUAL BASIC program to control all the activities, linked to the ACIS program for estimating optimized feed values. Laboratory tests were conducted To verify the results from the modeling, using an insert type one flute ball–end cutter on a CK45 carbon steel work piece. No coolant was used throughout the experimental works. Comparison were made between the maximum cutting forces, in the ”fix” feed rate tests. The results indicate significant increases in productivity which can be achieved, by using the optimized feed rate method<\div>
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