Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1775-1782    Article in Press

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  EXPERIMENTAL INVESTIGATION OF THE EFFECT OF PROCESS PARAMETERS ON THE SURFACE ROUGHNESS IN FINISHING PROCESS OF CHROME COATED PRINTING CYLINDERS (TECHNICAL NOTE)
 
V. Alimirzaloo, V. Modanloo and E. Babazadeh Asbagh
 
( Received: August 13, 2016 – Accepted in Revised Form: November 11, 2016 )
 
 

Abstract    One of the challenges in the printing industry is the presence of extra lines in printing design. This problem is due to the improper surface roughness of carved cylinders. This research endeavors to specify and optimize the effective parameters on the surface roughness of chrome coated printing cylinders in the finishing process that is done using a finish star machine. Investigated parameters include lubricant volume, feed rate of machine head, emery feed rate, emery compressive force, emery vibration and peripheral speed. By performing some experiments designed by response surface methodology, suitable ranges for the parameters were determined using contour plots and desirability function approach. Results show that the head feed rate, peripheral speed of the part and emery force are the significant parameters on the surface roughness. Surface roughness decreases by reducing the head feed rate. By increasing the emery force up to ten kilogram, surface roughness increases but afterwards gradually decreases. The roughness decreases by increasing the peripheral speed of the part up to 40 m/min, but increases after this value. At last, suitable range and optimal value of the effective process parameters was achived for the desirable surface roughness that is between 0.32 to 0.37 micron.

 

Keywords    Printing Cylinders, Roughness, Finishing, Response Surface Methodology

 

چکیده    یکی از مشکلات موجود در صنعت چاپ با سیلندر چاپ حکاکی شده، وجود خطوط اضافه در چاپ یا کم‌رنگ و پررنگ بودن طرح چاپی می‌باشد که این مشکل عمدتا ناشی از زبری سطح نامناسب سطح سیلندر چاپ می‌باشد. در این پژوهش تلاش شده است تا عوامل تاثیرگذار بر زبری سطح سیلندرهای چاپ با پوشش کروم در فرآیند پرداختکاری با استفاده از دستگاه فینیش استار شناسایی و بهینهسازی شود. پارامترهای مورد مطالعه شامل مقدار روانکار، میزان پیشروی هد دستگاه، میزان پیشروی سنباده، نیروی فشاری سنباده، میزان ارتعاش سنباده و سرعت محیطی قطعه‌‍‌کار چاپ میباشد. با انجام تجربی آزمایشهای طراحی شده با روش رویه پاسخ، محدوده مناسب پارامترها برای زبری مطلوب با استفاده از نمودارهای کانتوری و روش تابع مطلوبیت بدست آمد. نتایج نشان میدهد که پارامترهای سرعت پیشروی هد، سرعت محیطی و نیروی سنباده سه عامل تاثیرگذار میباشند. با کاهش میزان پیشروی، زبری سطح کاهش می‌یابد. با افزایش نیروی سنباده تا ده کیلوگرم زبری سطح افزایش ولی با تجاوز از ده کیلوگرم زبری سطح به تدریج کاهش می‌یابد. همچنین با افزایش سرعت محیطی تا چهل متر بر دقیقه، زبری سطح کاهش می‌یابد ولی بعد از آن افزایش می‌یابد. محدوده مناسب و مقدار بهینه پارامترهای مؤثر، برای زبری سطح مطلوب که بین 32/0 تا 37/0 میکرون است استخراج شد.

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