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微型化和尺度效应使得微弯曲在成形工艺、方法和装置上和传统弯曲有很大差异。本文针对微弯曲成形的特点研制出微弯曲成形装置,主要包括传动机构、模具、数据采集模块和定位系统。利用该装置,在0.077 mm/s的成形速度下,分别对0.1 mm、0.2 mm和0.4 mm厚的H62黄铜超薄板进行自由弯曲实验,根据采集数据得到弯矩-挠度拟合曲线,分析了微弯曲过程中的尺寸效应:即试样尺寸与晶粒尺寸对弯矩的影响规律,结果表明弯矩随着晶粒尺寸的增大而减小,并用表面层模型和细晶强化理论来进行解释。
Miniaturization and scaling effects make microbending quite different from traditional bending in forming processes, methods and devices. In this paper, a microbend forming device is developed according to the characteristics of microbending, including transmission mechanism, die, data acquisition module and positioning system. With this device, the bending test of H62 brass thin plates with thickness of 0.1 mm, 0.2 mm and 0.4 mm was carried out respectively at the forming speed of 0.077 mm / s. According to the collected data, the bending moment-deflection fitting curve was obtained and analyzed The effect of size on the micro-bending process: the influence of sample size and grain size on the bending moment, the results show that the bending moment decreases with the increase of grain size, and with the surface layer model and fine grain strengthening theory Explain.