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试验研究表明,在评定材料成型性能时,用极限胀形高度(LDH)和胀形系数(R),比用拉胀类成型参数杯突值(IE)能更真实地反映材料的成型性能.这是因为:①杯突试验值(IE)受多种试验条件及人为因素的影响,往往产生无法克服的误差;②极限胀形高度(LDH)及胀形系数(R)试验方法,弥补了杯突试验的各种不足之处。本文还对简化成型极限图(FLD)的可行性进行了探讨,认为 FLD 必须经过简化处理后,才能用于产品验收时的成型性能评定.简化图解决了制作标准成型极限图时难度大、费工时、成本高等问题,更适于在线产品的生产性检验.
Experimental studies have shown that the ultimate formability (LDH) and bulge factor (R) can be used to evaluate the formability of a material more faithfully than that of an expansive forming parameter (IE). This is because: (1) Test of cup protrusion (IE) is often unmanageable due to a variety of test conditions and human factors; (2) Test methods for ultimate bulge height (LDH) and bulge coefficient (R) Cupping test various deficiencies. The feasibility of simplified forming limit map (FLD) is also discussed in this paper, and FLD must be simplified before it can be used to evaluate the formability during product acceptance. The simplified diagram solves the difficulty of making standard forming limits Working hours, high cost, more suitable for online product testing.