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前言冷轧深冲薄板的成形性能是判断产品质量优劣的主要标志,而塑性应变比r和应变硬化指数n又是评定深冲薄板成形性能的重要参数。由于深冲薄板的生产和需要日益增长,冲压成形的成品率之提高具有很大的经济意义,故国内外都很重视这方面的研究工作。目前,世界上许多国家都在制定和完善r值和n值的标准试验方法,美国和德意志民主共和国已建立了国家标准,我国也纳入了定标计划。为了配合正在进行的r值n值试验方法的纳标工作,我们做了下述五个方面的实验研究:1.卸载与不卸载对r值的
Preface The formability of cold-drawn deep-drawn sheet is the main indicator to determine the quality of products. The plastic strain ratio r and strain hardening index n are important parameters for evaluating the forming performance of deep drawing sheet. Due to the deep-drawn sheet production and the need for increasing growth, the stamping of the yield increase has great economic significance, so both at home and abroad have attached great importance to this research. At present, many countries in the world are making and improving standard test methods for r and n values. The United States and the Democratic Republic of Germany have established national standards, and our country has also included a calibration plan. In order to meet the ongoing r value of n-value test methods for the standard work, we do the following five aspects of the experimental study: 1. Unloading and unloading of r value