(西安理工大學(xué) 機(jī)械與精密儀器工程學(xué)院， 西安 710048)
摘 要: 提出了一種新的翅片管無屑切削-擠壓復(fù)合成形方法。 對成形原理及切削、擠壓翻轉(zhuǎn)、 彎曲成形3個階段的特點(diǎn)進(jìn)行了研究， 建立了翅片幾何尺寸的理論計(jì)算公式， 分析了適合這種加工的刀具結(jié)構(gòu)特點(diǎn)，給出了刀具的設(shè)計(jì)原則， 通過實(shí)驗(yàn)獲得了主偏角、 切削深度、 進(jìn)給量等工藝參數(shù)對翅片幾何尺寸的影響規(guī)律。 理論和實(shí)驗(yàn)研究表明： 在紫銅材料的成形中， 切削深度小于2 mm、 進(jìn)給量0.5~3 mm、 刀具主偏角20°~50°范圍內(nèi)， 可以穩(wěn)定地形成翅高1.5~3.0 mm、翅厚0.3~1.8 mm的翅片。因此， 合理地選擇刀具結(jié)構(gòu)及切削用量參數(shù)是獲得理想翅片形狀和尺寸的關(guān)鍵因素。
關(guān)鍵字: 切削-擠壓復(fù)合成形； 翅片； 工藝參數(shù)； 刀具結(jié)構(gòu)
（ Department of Mechanical Engineering and Precision Instrument,
Xi'an University of Technology, Xi'an 710048, China）
Abstract: A new non-chip cutting-press compound shaping technique of fin tube was presented. The mechanism of cutting-press shaping was studied, and the shaping process properties about the cutting, the overturning with proper press and the bend shaping were analyzed. The theoretical calculating formulas of fin geometry dimension were set up. The structure characteristics of the cutting-press tool were analyzed, and the tool design rules were presented. Laws of the fin geometry dimension influenced by process parameters such as tool side cutting edge angle, depth of cutting, feed, etc. were obtained through experiments. Theoretical analysis and experimental results show that in shaping of copper fin, when the depth of cut is less than 2 mm, the feed is ranged from 0.5 to 3 mm, and side cutting edge angle is ranged from 20° to 50°, fin with height from 1.5 to 3 mm and thickness from 0.3 to 1.8 mm can be steadily formed. Therefore, appropriate tool structure and cutting parameters are key facts in the fin shaping with ideal shape and size.
Key words: cutting-press compound shaping technique; fin; process parameters; tool structure
