مطالعه تجربی شکل‌دهی تدریجی دونقطه‌ای ورق St12 با استفاده از قالب‌های منفی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل ایران

2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

شکل‌دهی تدریجی دونقطه‌ای به دودسته منفی و مثبت تقسیم‌بندی می‌شود که فرایند مورد بررسی در این پژوهش، شکل‌دهی تدریجی دونقطه‌ای منفی می‌باشد. امروزه در صنعت شکل‌دهی، تولید قطعاتی با دقت ابعادی و توزیع ضخامت مناسب بسیار حائز اهمیت می‌باشد. هدف این پژوهش بهبود دقت ابعادی و توزیع ضخامت نمونه تولیدشده توسط فرایند شکل‌دهی تدریجی دونقطه‌ای منفی می‌باشد. در راستای این هدف، توزیع ضخامت و دقت ابعادی قطعات مخروطی شکل با استفاده از ایجاد تغییراتی در پارامترهای فرایند مانند قطر ابزار، گام عمودی، نوع روانکار و راهبرد تغییر شکل بررسی شده است. برای انجام این پژوهش از یک دستگاه فرز کنترل عددی، یک مجموعه کامل قالب منفی، ورق فولادی St12 به ضخامت 9/0 میلی‌متر، ابزار سر کروی و روانکار روغن SAE 10W استفاده شده است. تحلیل نتایج حاصل از آزمایش‌ها نشان می‌دهد که در اثر افزایش قطر ابزار در گام عمودی ثابت، ضخامت کمینه از 24/0 به 5/0 میلی‌متر افزایش می‌یابد که سبب کاهش نازک‌شدگی و در نهایت احتمال پارگی در ورق شده‌ است. کاهش قطر ابزار در گام عمودی ثابت باعث شکل‌دهی بهتر در گوشه‌‌های نوک‌تیز قطعات تولیدی ‌شده و با به‌کارگیری راهبرد شکل‌دهی جدید و افزایش تعداد مراحل آن از یک مرحله به دو مرحله، ضخامت کمینه افزایش ‌یافته است. این حالت، سبب بهبود توزیع ضخامت نمونه و کاهش احتمال پارگی در نمونه ‌شده و باتوجه ‌به بررسی‌های انجام شده در این پژوهش، روانکار تأثیر چشم‌گیری در توزیع ضخامت و دقت ابعادی نمونه تولیدی نداشته و استفاده از روانکار در این پژوهش تنها سبب کاهش زبری سطح گردیده است.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental study of two-point incremental forming of St12 sheet using negative dies

نویسندگان [English]

  • Alireza Hajfathalian 1
  • Mohammad Javad Mirnia 2
  • Majid Elyasi 2
1 Department of Mechanical engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Department of Mechanical engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

Two points incremental forming is divided into two categories, negative and positive, and the process investigated in this research is Two points incremental forming. Today, in the forming industry, the production of parts with Dimensional accuracy and proper thickness distribution is very important. The aim of this research is to improve the dimensional accuracy and thickness distribution of the sample produced by the negative two-points incremental forming process. For this purpose, thickness distribution and dimensional accuracy of conical parts have been investigated by making changes in process parameters such as tool diameter, step down, type of lubricant and deformation strategy. To do this research, a numerically controlled milling machine, a complete set of negative die, St12 steel sheet with a thickness of 0.9 mm, spherical tool and SAE 10W oil lubricant were used The analysis of the results of the tests shows that due to the increase in the diameter of the tool at a constant step down, the minimum thickness increases from 0.24 to 0.5 mm, which has caused a decrease in thinning and ultimately the possibility of tearing in the sheet. Reducing the diameter of the tool in a constant step down has led to better shaping in the sharp corners of the production parts, and by applying a new shaping strategy and increasing the number of stages from one stage to two stages, the minimum thickness has increased. This state has improved the thickness distribution of the sample and reduced the possibility of tearing in the sample, and according to the investigations carried out in this research, the lubricant did not have a significant effect on the thickness distribution and dimensional accuracy of the production sample, and the use of the lubricant in this research only reduced the surface roughness.

کلیدواژه‌ها [English]

  • Two-point Incremental Forming
  • Negative Die
  • Tool Diameter
  • Step Down
  • Lubricant
  • Thickness Distribution
  • Dimensional Accuracy

مراجع

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