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ساخت و تولید- مکانیک - ورق های Tailor Welded Blanks

ساخت و تولید- مکانیک

جمعه 20 بهمن 1391

ورق های Tailor Welded Blanks

نویسنده: امیر حسین اولادان   

TWB

ورق های TWB که در صنعت به خصوص خودروسازی کاربرد یافته اند، شامل بلانک هایی هستند که از دو قسمت متفاوت تشکیل شده اند. این تفاوت می تواند در ضخامت، خواص مکانیکی، grade، پوشش و... باشد. این دو قسمت توسط جوشکاری به یکدیگر اتصال می یابند و یک بلانک یکپارچه ایجاد می شود. پس از آن این بلانک ها را مانند ورق های معمولی در قالب های شکل دهی قرار می دهند تا قطعه نهایی شکل بگیرد.

با روش های مختلفی می توان جوشکاری این بلانک ها را انجام داد که از جمله آنها می توان به موارد زیر اشاره کرد:

Mash seam welding، Laser welding، اشعه الکترونی EBW، جوش اصطکاکی و جوش القایی، پس از جوشکاری یک منطقه Heat Affected Zone (HAZ) روی بلانک و در اطراف خط جوش ایجاد می شود که باعث کاهش شکل پذیری و ایجاد خواص نامطلوب می شود. پس هر چه عرض این منطقه کمتر باشد بهتر است. در جوش لیزر به دلیل انرژی بالای و اتوماتیک بودن فرایند، عرض این منطقه کمتر است و کاملاٌ متناسب برای تولید این نوع از بلانک ها در تیراژ بالا می باشد.

از مزایای استفاده از TWB ها می توان به کاهش وزن اتومبیل و قطعات، کاهش قیمت تمام شده اتومبیل، افزایش استحکام منطقه ای، کاهش مصرف سوخت، کاهش آلودگی محیط زیست، جلب رضایت مشتری، انعطاف پذیری بیشتر در طراحی خودرو، آسوده شدن طراحان در مورد انتخاب مواد و اشکال قطعات، کاهش مراحل تولید و مواد مصرفی، امکان اتوماتیک کردن کامل فرآیند تولید و افزایش ایمنی در بدنه خودرو نام برد.

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