| 姚震， 李金国， 谢海波.基于Moldflow的车灯装饰框拐角气痕成因分析与对策[J].轻工机械,2021,39(4):94-97 |
| 基于Moldflow的车灯装饰框拐角气痕成因分析与对策 |
| Causes and Countermeasures of Flow Marks in Corner of Car Lamp Decoration Frame Base on Moldflow |
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| DOI：10.3969/j.issn.1005 2895.2021.04.018 |
| 中文关键词: 注塑成型 车灯装饰框 困气 气痕 Moldflow软件 |
| 英文关键词:injection molding car lamp decoration frame trapped gas air mark Moldflow |
| 基金项目:台州市重点技术创新团队项目：高精密智能化塑料模具研发(02071028)；台州市科技计划项目：2001gy17。 |
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| 中文摘要: |
| 车灯装饰框对外观质量有着极高的要求，针对注塑成型过程中经常会出现装饰框拐角周围存在气痕，导致产品外观不合格的情况。课题组借助Moldflow软件对某车灯装饰框成型方案进行模拟，发现拐角区域存在困气现象，是造成表面气痕缺陷的主要成因。研究表明：装饰框拐角处壁厚较厚，喷泉流动自由表面接近半圆形，自由表面曲率半径大于拐角半径，易形成困气。课题组通过改变拐角附近壁厚，减少喷泉流动自由表面半径，当车灯件拐角半径R>T/2时，数值模拟结果显示该区域不存在困气现象。经试模，改进后车灯装饰框表面质量合格。 |
| 英文摘要: |
| There are extremely high requirements for the appearance quality of the decoration frame of car lamp. In view of the problem that gas mark often appears at the corner of decoration frame in the process of injection molding which results in unqualified product, the injection molding process of the car lamp decoration frame was simulated by Moldflow software and it was found that the trapped gas in the corner area was the main cause of gas mark defect. The results show that the relatively thick wall thickness of the corner of the decoration frame, the nearly semicircular free surface of the fountain flow and its curvature radius which is bigger than corner radius are the reasons that easily cause the trapped gas phenomenon. By changing the wall thickness near the corner and reducing the free surface of the fountain flow, when the corner radius of the car lamp R>T/2 wall thickness of the car lamp parts, the numerical simulation results show that there is no trapped gas phenomenon in this area. The surface quality of the decoration frame of car lamp is qualified after mold testing. |
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