Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1792-1799   

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  EFFECT OF COATING MATERIALS ON WEAR IN INTERNAL GEARS
 
M. Safak Tunalioglu, B. Tuc and M. Emin Erdin
 
( Received: June 09, 2017 – Accepted in Revised Form: September 08, 2017 )
 
 

Abstract    Theoretical and experimental investigation of wear during coupling in internal gears coated with various polymeric coating materials was performed in this study. In the theoretical part of the study, Archards’ wear formulation was adapted to internal gears and wear behavior in various conditions was determined. Moreover, a fatigue and wear testing apparatus having similar working principle with FZG (Forschungsstelle für Zahnrader und Getreibbau) closed circuit power circulation system was designed and manufactured to experimentally investigate the wear in internal gears. Internal gear-pinion couples manufactured from St50 material were coated with various polymeric materials, namely PTFE (polytetrafluoroethylene), MoS2 bonded with polyamide, MoS2 bonded with epoxy in the experimental study. An uncoated internal gear was also investigated to find out the performance of coated gears. Variation of wear depth on tooth profiles of internal gears were determined theoretically and experimentally. [ah1] Theoretical and experimental studies showed that polymeric coated internal gears have more wear resistance than uncoated ones by means of high lubrication ability and low friction coefficient of coating materials. It was also observed that high corrosion resistance of polymeric coatings protected metallic surfaces and decreased corrosive wear.


[ah1]repeated

 

Keywords    Internal gear, rolling-sliding wear, wear testing, coating materials

 

چکیده    در این مطالعه، بررسی تئوری و تجربی سایش در هنگام درگیری چرخ­دنده­های داخلی پوشانده شده با مواد پوشش پلی­مری مختلف انجام شد. در بخش نظری مطالعه، از فرمول سایش آرچرز برای چرخ­دنده­های داخلی استفاده و رفتار سایش در شرایط مختلف تعیین شد. علاوه بر این، یک دستگاه تست خستگی و سابش مشابه با روش کار FZG (Forschungsstelle für Zahnrader und Getreibbau) سیستم گردش قدرت مداربسته چرخ­دنده­های داخلی طراحی و ساخته شد. به منظور آزمایش سایش در چرخ­دنده­های داخلی. زوج دنده­ای داخلی ساخته شده از ماده­ی St50 با مواد پلی­مری مختلف، از جمله PTFE (polytetrafluoroethylene)، MoS2 با پلی آمید، MoS2 پیوند شده با اپوکسی در مطالعه تجربی پوشش داده شد. برای شناسایی عملکرد چرخ­دنده­های پوشش داده شده، یک چرخ­دنده داخلی بدون پوشش نیز بررسی شد. مطالعات نظری و تجربی نشان می­دهد که چرخ­دنده­های داخلی پلی­مری پوشش داده شده به خاطراستفاده از قابلیت روان­کاری بالا و ضریب اصطکاک کم مواد پوشش مقاومت بیشتری نسبت به چرخ­دنده­های بدون پوشش دارند. همچنین مشاهده شد که مقاومت در برابر خوردگی بالای پوشش­های پلی­مری موجب محافظت سطوح فلزی و کاهش خوردگی می­شود.

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