مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی تجربی و عددی تاثیر لقی قالب بر ویژگی‏ های برش در فرایند برش دقیق یک قطعه با هندسه پیچیده از جنس فولاد CK15

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، گروه مهندسی مکانیک، دانشگاه صنعتی سیرجان، کرمان، ایران
2 دانشیار، گروه مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
3 استادیار، گروه مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران
چکیده
در این مقاله، تاثیر مقدار لقی قالب بر کیفیت لبه برش در فرایند برش دقیق یک قطعه با هندسه پیچیده از جنس فولاد CK15 مورد بررسی قرار گرفته است. فرایند برش دقیق با استفاده از نرم‏افزار DEFORM 3D به روش المان محدود در حالت سه‏ بعدی شبیه ‏سازی شده و نتایج به ‏دست آمده با نتایج تجربی مقایسه شد. نیروی برشی، توزیع تنش و کرنش، ابعاد منطقه شعاعی، کیفیت سطح و دقت ابعادی قطعه‏ کار به عنوان معیارهای برش دقیق در نظر گرفته شدند. با بررسی نتایج مشخص شد که با افزایش لقی قالب، گستره کرنش و تنش معادل بر روی ماده خام افزایش یافته و قسمت بیشتری از ‌ماده در فضای لقی دچار تغییرشکل پلاستیک می ‏گردد؛ بنابراین با کاهش لقی این نواحی متمرکزتر شده، در نتیجه کرنش خط برش کاهش یافته و لبه برش از دقت و کیفیت بالاتری برخوردار می‏ شود. همچنین با افزایش نیروی سنبه، پدیده بشقابی شدن و عیوب سطحی قطعه نهایی کاهش می‌یابد. همچنین نتایج نشان داد که با افزایش لقی قالب از مقدار 4/0 تا 6/0% ضخامت ورق، مقدار تنش وارد شده بر خط جدایش ورق به میزان 25% و میانگین کرنش مواد در محیط اطراف خط برش در حدود 82% افزایش یافته است.
کلیدواژه‌ها

عنوان مقاله English

Experimental and numerical investigation of the effect of die clearance on the cutting characteristics in the fine blanking of a complex part made of CK15 steel

نویسندگان English

Amin Safi Jahanshahi 1
Majid Elyasi 2
Farzad Ahmadi Khatir 3
1 Assistant Professor, Mechanical Engineering Department, Sirjan University of Technology, Sirjan, Iran
2 Associate Professor, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
3 Assistant Professor, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
چکیده English

This paper investigates the effect of die clearance on the quality of the cutting edge in the fine blanking process of a part with a complex geometry made of CK15 steel. The fine blanking process was simulated using the finite element method through DEFORM 3D software and the results were compared with the experimental results. Cutting force, distribution of stress and strain, dimensions of the radial area, surface quality, and dimensional accuracy of the workpiece were considered as fine blanking criteria. By examining the results, it was found that with increasing the die clearance, the range of equivalent strain and stress on the raw material increases and plastic deformation occurs in the material at the clearance zone. Therefore, by reducing the clearance, these areas become more concentrated, as a result, the strain of the cutting line is reduced and the cutting edge has higher precision and quality. Also, by increasing the punch force, the phenomenon of non-flatness and surface defects of the final part reduces. The results have shown that by increasing die clearance from 0.4 to 0.6 sheet thickness, the stress of the sheet increased to 25%, and the average strain increased about 82%.

کلیدواژه‌ها English

Fine Blanking
Clearance
Finite Element Simulation
Surface Quality
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