锻压技术

板料预涂油对冲压件成形性能的影响

英文标题：Influence of pre-coated oil for sheet metal on forming performance of stamping parts

单位：1.一汽-大众汽车有限公司外协件生产准备科 2.一汽-大众汽车有限公司冲压中心

分类号：TG386.1；TG305

出版年,卷(期):页码：2021,46(12):112-116

摘要：

为了探究冲压生产过程中模具和板料之间的摩擦情况进而确定板料润滑所需的涂油挤干辊压力，解决车身外表面件在生产过程中难以控制的板料润滑问题，以材料牌号为HC180B+ZE75BPO、厚度为0.7 mm的某车型翼子板为研究对象，所用清洗油的型号为NR-320，40 ℃下的运动粘度为7.5~9.5 mm2·s-1。分别控制不同的挤干辊压力，进行翼子板成形实验，并将得到的翼子板变形量最大的区域进行网格实验分析，研究不同清洗涂油机挤干辊压力与板料表面油膜厚度的对应关系，从而分析对板料减薄率的影响。结果表明：挤干辊压力增大，板料油膜涂覆量减小，易引起缩颈和拉裂缺陷，同时考虑涂油量大会引起局部起皱现象，确定了合适的涂油挤干辊压力范围为9.0~9.5 MPa。

In order to explore the friction condition between die and sheet metal during the stamping production process, determine the oil-coated squeezing roller pressure required by sheet metal lubrication and solve the problem of sheet metal lubrication that was difficult to control in the production process of body exterior parts, for the fender of a vehicle with material designation of HC180B+ZE75BPO and the thickness of 0.7 mm, using cleaning oil type of NR-320 with the kinematic viscosity of 7.5-9.5 mm2·s-1 at 40 ℃, the fender forming experiments were carried out by controlling different squeezing roller pressures, and the area obtained with the largest deformation for the fender was analyzed by grid experiment. Then, the corresponding relationships between the squeezing roller pressure of different cleaning and oiling machines and the oil film thickness on the sheet metal surface were studied so as to analyze the influence on the thinning rate of sheet metal. With the increasing of the pressure for squeezing roller, the coating amount of oil film on the sheet metal decreased, which was easy to cause necking or cracking defects. Considering that more pro-coated oil can cause local wrinkle defect, the suitable pressure range of oil-coated squeezing roller was 9.0-9.5 MPa.

基金项目：

杨秀臣（1990-），男，硕士，外协件管理工程师 E-mail：yangxiuchen2008@126.com

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