Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Forming mechanism of integral serrated high fins by
plowing-extruding based on variational feed
WAN Zhen-ping(万珍平), YAN Hui(燕 辉), TANG Yong(汤 勇)

School of Mechanical and Automotive Engineering, South China University of Technology,
Guangzhou 510640, China

Abstract:Plowing-extruding tool was designed and plowing-extruding process was investigated. Then, a manufacturing method of integral serrated high-finned tube, plowing-extruding based on variational feed was proposed, in which plowing-extruding tool moved forward at two different feeds, f1 and f2, in turn. In this method, overlaps that are usually avoided in practical application were utilized to manufacture high fins and average height of fins was up to 1.58 mm. The critical feed (fc) of overlaps forming and terms of high fins forming were analyzed. The main technical parameters that affect the fins height were discussed. The experimental results show that the fins height increases with extruding inclination angle and plowing-extruding depth, and the fins height increases with f1 increasing when f1 is smaller than fc, and decreases with f1 increasing if f1 is larger than fc.

 

Key words: enhanced heat transfer tube; integral serrated high fins; plowing-extruding

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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