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励高精密模具对精密五金冲压件材料的要求
08-21 / 2019

精密五金冲压件材料的表面和内在性能对冲压成品的质量影响很大,励高精密模具对于冲压材料的要求是:

①厚度精确、均匀。冲压用模具精密、间隙小,板料厚度过大会增加变形力,并造成卡料,甚至将凹模胀裂;板料过薄会影响成品质量,在拉深时甚至出现拉裂。
②表面光洁,无斑、无疤、无擦伤、无表面裂纹等。一切表面缺陷都将存留在成品工件表面,裂纹性缺陷在弯曲、拉深、成形等过程可能向深广扩展,造成废品。
③屈服强度均匀,在拉深、翻边、胀形等
冲压过程中,因各向屈服的出现有先后,塑性变形量不一致,会引起不均匀变形,使成形不准确而造成次品或废品。
④均匀延伸率高。抗拉试验中,试样开始出现细颈现象前的延伸率称为均匀延伸率。在拉深时,板料的任何区域的变形不能超过材料的均匀延伸范围,否则会出现不均匀变形。
⑤屈强比低。精密
五金冲压件的屈服极限与强度极限之比称为屈强比。低的屈强比不仅能降低变形抗力,还能减小拉深时起皱的倾向,减小弯曲后的回弹量,提高弯曲件精度。
⑥加工硬化性低。冷变形后出现的加工硬化会增加材料的变形抗力,使继续变形困难,故一般采用低硬化指数的板材。但硬化指数高的材料的塑性变形稳定性好,不易出现局部性拉裂。

励高精密模具在实际生产中,常进行工艺性试验,如拉深性能试验、胀形性能试验等检验材料的冲压性能,以保证精密五金冲压件质量。


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