切削-挤压复合成形技术

Cutting-press compound shaping technique

提出了一种新的翅片管无屑切削挤压复合成形方法。对成形原理及切削、挤压翻转、弯曲成形3个阶段的特点进行了研究,建立了翅片几何尺寸的理论计算公式,分析了适合这种加工的刀具结构特点,给出了刀具的设计原则,通过实验获得了主偏角、切削深度、进给量等工艺参数对翅片几何尺寸的影响规律。理论和实验研究表明:在紫铜材料的成形中,切削深度小于2mm、进给量0.5～3mm、刀具主偏角20°～50°范围内,可以稳定地形成翅高1.5～3.0mm、翅厚0.3～1.8mm的翅片。因此,合理地选择刀具结构及切削用量参数是获得理想翅片形状和尺寸的关键因素。

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.