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微型微通道管产品具有孔道数量多、孔道尺寸小、壁厚薄、尺寸精度要求高等特点,制备加工难度很大。采用连续挤压制备方法,通过采取双槽挤压方式、增加金属导流板等措施,对模具结构与加工方法、挤压工艺进行优化设计,明显改善了微型微通道管产品挤压成形时金属在产品宽度方向的流动均匀性、孔道部位的有效填充及焊合质量,解决了挤压过程中模具模芯强度不足导致的尺寸超差与失效问题和溢料过多导致产品无法挤出等问题。最终成功试制了厚度为2.2 mm、宽度为45 mm的52孔微型微通道管产品,产品外形尺寸和组织结构均满足设计要求。
Micro-microchannel tube products with a large number of holes, hole size, thin wall, high dimensional accuracy requirements, the preparation of processing is very difficult. The method of continuous extrusion is adopted to optimize the mold structure, processing method and extrusion process by adopting the methods of double-groove extrusion and metal baffle, which obviously improves the quality of the metal The flow uniformity in the width direction of the product, the effective filling and welding quality of the channel parts, the problems of over-size and failure caused by the insufficient strength of the mold core during the extrusion process and the problem that the over-material leads to the problem that the product can not be extruded . Finally, a 52-hole miniature microchannel tube with a thickness of 2.2 mm and a width of 45 mm was successfully fabricated. The product’s dimensions and structure meet the design requirements.