توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Identification of Tool Life and Wear Characteristics of HSS Tools Used in Turning of Ck45
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۰
Cutting tools can be used when they do not reach tool life criteria and can produce parts with desired surface finish and dimensional accuracy. When the cutting edge of the tool reaches one of the tool life criterion, the tool should be replaced by a new one or sending it for regrinding [1]. During cutting operations, the cutting tool experiences various stresses such as normal, shear and also thermal shocks. These stresses cause wear and breakage of cutting edge. Tool wear is defined as a gradual loss of tool material at contact zones of workpiece and tool material, resulting the cutting tool reaches its life limit [2]. This research is based on ISO3685 and investigates the flank wear patterns of HSS tools during machining of CK45. It also determines the effects of cutting conditions on Taylor tool life equation.<\div>

۲Implementing P–H High Speed Cornering Method on P–PI Servo Controller with Backlash
نویسنده(ها): ،
اطلاعات انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۰
In this paper, real–time Pythagorean hodograph (P–H) curve CNC interpolators are used for high speed corner machining. There are large contouring errors around sharp corners when low–bandwidth servo controllers (such as P–PI control) are used. Also backlashes can impose additional errors during tracking a corner. In order to decrease the amount of the cornering errors, an improved interpolation method is proposed. The geometric parameters of the over corner P–H curve and the feed rate along the modified tool path are computed by Pattern Search Algorithm in order to reduce the maximum cornering error. The results of simulation, such as the cornering error and the total cornering time, are compared with previously published methods. It has been observed that the developed over–corner PH approach will substantially reduce the amount of cornering error for P–PI servo controller with backlash.<\div>

۳Analytical Chip Load Prediction for Rough End Mills
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۹
Rough end mills with serrated cutting edges are effectively used for suppressing chatter vibrations encounter during milling operations. In this study, serrated cutting edges are analytically defined and geometrically modelled by a NURBS curve. The chip load on the serrated cutting edges is computed by newly proposed recursive algorithm. It is shown that the proposed model can be used in estimating the chip load of rough end mills during operation. Validity and accuracy of the recursive algorithm is geometrically verified with ASIC 3D solid modeller. The developed algorithm can be effectively implemented for static and dynamic simulation of cutting process.<\div>

۴Geometric Simulation of Surface Texture in Low Immersion Side Milling Process
نویسنده(ها): ،
اطلاعات انتشار: دهمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۹
Prediction of surface texture in various machining operations has become popular as more emphasis is placed on the quality of manufactured parts in industry. It is difficult to evaluate 3D surface errors in side wall machining due to geometrical and physical complexities of milling operation. In this paper, a new method has been developed for predicting surface texture in low immersion side milling using geometric modelling approach. This method is developed using ACIS solid modeller as the geometric engine. The geometry of end mill cutting edges is modelled based on NURBS theory and the workpiece is considered as a solid block. The presented model can detect the instantaneous intersection between each cutting edge and the workpiece, calculating the dynamic chip thickness as well as cutting forces. In addition it can predict the milled surface texture considering the milling system dynamics. The method presented in this paper has been verified and agreed well with experimental results.<\div>
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