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本文研究了金属管的材质、显微组织和热处理对液压管工艺的响应。在实施一个成功的液压管工艺中最重要的参数之一是选择适当的金属管的材料。在分析部分,探索了为液压工艺选用的适当管材料所需的几个有效参数。最终得出较高的应变硬化指数(n),弹性模量(E)和各向异性指数(R),它们能在此工艺中增强成形性能。已经研究了显微组织和热处理对ASTM C11000铜和ASTM AA1050铝的成形性能的影响。因此选择了4种不同热处理工艺,有不同的加热温度和保温时间,以及对每一种材料的不同冷却方法。在试验中详细观测了这些热处理方法对最大膨胀高度、应变厚度和最终形成的压力的影响。用金相检验也观测了热处理对铜的显微组织的影响;另一方面考察了铜的显微组织对液压管工艺的影响。这些分析的结果,对铜和铝推荐两种热处理方法,即分别在450℃和350℃加热15 min,在水中冷却。所以采用这两种方法是因为能得到较高的应变厚度和膨胀高度,从而获得细而均匀的显微组织,较高的机械强度和增加材料的成形性。最后,测得两种材料的机械性能后,比较了它们的两个参数,强度系数和应变硬化指数,并把它们作为液压管工艺改善管变形的有效因素。
In this paper, the metal tube material, microstructure and heat treatment on the hydraulic tube process response. One of the most important parameters in implementing a successful hydraulic tube process is selecting the proper metal tube material. In the analysis section, several valid parameters required for the proper pipe material selected for the hydraulic process were explored. The resulting higher strain hardening index (n), modulus of elasticity (E) and anisotropy index (R) result in enhanced formability during this process. The effect of microstructure and heat treatment on the formability of ASTM C11000 copper and ASTM AA1050 aluminum has been investigated. Therefore, the choice of four different heat treatment process, a different heating temperature and holding time, as well as different cooling methods for each material. The effects of these heat treatment methods on the maximum expansion height, the strain thickness and the resulting pressure were carefully observed in the test. Metallographic examination was also used to observe the effect of heat treatment on the microstructure of copper. On the other hand, the effect of copper microstructure on the performance of the hydraulic tube was investigated. As a result of these analyzes, two heat treatment methods are recommended for copper and aluminum, which are respectively heated at 450 ° C and 350 ° C for 15 min and cooled in water. Therefore, the two methods are adopted because higher strain thickness and expansion height can be obtained to obtain fine and uniform microstructure, higher mechanical strength and increase material formability. Finally, after measuring the mechanical properties of the two materials, two parameters of them, the strength coefficient and the strain hardening index, were compared and used as an effective factor to improve tube deformation in the hydraulic pipe process.