后側門內板鎖孔附近起皺縮頸開裂的解決方法
代建文，黃敏鶇，謝雙，楊勝統（上汽通用五菱汽車股份有限公司，廣西柳州545007）
摘要：針對汽車后側門內板在成形過程中鎖孔附近產生起皺開裂的問題，分析了起皺開裂產生的原因，起皺區域需局部增加板料成形或減少板料流動，縮頸開裂區域需局部減少板料成形或增加板料流動。采用四象限分析法，采取增大R角或拔模角度、調整廢料區刺破刀、加高法蘭邊工藝補充、提高模具零件表面粗糙度和硬度、控制板料油膜厚度、調整氣墊壓力、將凹模、凸模和壓邊圈鍍鉻等措施，使起皺和縮頸開裂缺陷得到有效控制，提高模具生產穩定性。
關鍵詞：后側門內板；縮頸開裂；起皺；四象限分析法
中圖分類號：TG386.5
文獻標識碼：B
文章編號：1001-2168（2021）09-0014-06
DOI：10.16787/j.cnki.1001-2168.dmi.2021.09.004
Solution on wrinkling necking cracking near lockhole of rear door inner panel
DAI Jian-wen, HUANG Min-dong, XIE Shuang, YANG Sheng-tong (Saic-GM-Wuling Automobile Co., Ltd., Liuzhou, Guangxi 545007, China)
Abstract: The problem of wrinkling and cracking near the keyhole of the rear door inner panel in the forming process was introduced, and the causes were analyzed. The wrinkling area needed to locally add sheet forming or reduced sheet flow, while the necking cracking area needed to locally reduce sheet forming or add sheet flow. Four-quadrant analysis method was used, and the defects of wrinkling and necking cracking were effectively controlled with the measures that increasing the R angle or the draft angle, adjusting the waste area punctured tool, raising the flange process edge, improving the surface finish and hardness of die and parts, controlling sheet oil film thickness, adjusting cushion pressure, chrome plating on die. The production stability of die was improved.
Key words: rear door inner panel; necking cracking; wrinkling; four-quadrant analysis