مطالعه عددی و تجربی خطای جاسازی قطعه‌کار با هندسه چندوجهی در قید و بند

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود، شاهرود، ایران.

چکیده

هرگونه تغییر موقعیت و ارتفاع در جاسازهای قید و بند منجر به انحراف قطعه‌کار از موقعیت و جهت ایده‌آل می‌شود. در این پژوهش، یک رویکرد عددی و تجربی برای محاسبه خطای جاسازی قطعه‌کار در قید و بند استفاده شده‌ است. برای اجرای پژوهش، ابتدا مقادیر انحراف خطی و زاویه‌ای قطعه‌کار با اعمال اغتشاش در جاسازها با استفاده از مدل‌سازی عددی در نرم‌افزار آباکوس محاسبه ‌شد. برای صحت‌سنجی نتایج، یک مجموعه آزمایشگاهی شامل یک قید و بند به همراه قطعه‌کار ساخته شد و آزمایش‌های تجربی برای اندازه‌گیری مقادیر جابجایی‌های خطی و زاویه‌ای قطعه‌کار اجرا ‌شد. آزمایش‌های تجربی در دو حالت بدون بست و همراه با نیروی بست انجام شد و هر آزمایش سه بار تکرار شد. در رویه اول آزمایش‌های تجربی، قطعه‌کار در حالت کاملاً افقی قرار داشته و فقط نیروی بست با مقادیر 100، 150، 200، 250، 350 و 500 نیوتن به آن اعمال شد. در رویه دوم، اغتشاش همراه با نیروی بست به قطعه‌کار اعمال شد. با اعمال اغتشاش در جاسازها در هر دو حالت، مقدار جابجایی نقطه مرجع، که ناشی از تغییر شکل و تغییر موقعیت است، اندازه‌گیری شد و با مقادیر متناظر آن از شبیه‌سازی مقایسه ‌شد. با بررسی تمام نتایج، بیشترین مقدار خطای بین نتایج عددی و تجربی برای حالت‌های با و بدون اغتشاش برابر با 9/1% و 14/9% میلی‌متر به‌دست‌ آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical and Experimental Analysis of Locating Error of a Polyhedral Workpiece in the Fixture

نویسندگان [English]

  • Iman Rashidi
  • Hadi Parvaz
  • Mehdi Bahrami
  • Sattar Hazrati
M.Sc., Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

Any change in position of the fixture components can lead to deviations in the workpiece's position and orientation, resulting in a defective product. This study suggests a numerical and experimental approach to calculate the positioning error of the workpiece in the fixture. Initially, the linear and angular components of the workpiece deviation due to disturbances in the locators were calculated using numerical modeling in Abaqus software. An experimental setup was fabricated to validate the numerical results. The experimental tests were conducted to measure the linear and angular components of workpiece deviations. The experiments were performed in two conditions: with and without clamping force, with each experiment repeated three times. Also, the effects of applying clamping force and disturbances to the workpiece and locators were studied on the results. In the first series of tests, the workpiece was positioned in a fully horizontal position and clamping forces of 100, 150, 200, 250, 350, and 500 N were applied. In the second, disturbances were also applied to the locators along with the clamping force. In both procedures, the displacement of a reference point, resulting from deformation and deviation of the workpiece, was measured and compared with the numerical predictions. The analysis of all results revealed that the maximum errors between the numerical and experimental results for the disturbed and non-disturbed conditions were equal to 9.1% and 14.9%, respectively.

کلیدواژه‌ها [English]

  • Experimental Test
  • Locating Error
  • Fixture Error
  • Wear in Locator
  • Fixture Design

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 56، شماره 11
بهمن 1403
صفحه 1555-1574

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