4 热推弯头的生产工具热推弯头的主要生产工具是芯头和整形模。 4.1 芯头的材质及尺寸设计 4.1.1 芯头的材质及生产方法为保证热推弯头的曲率和内表面质量,要求芯头在高温状态下长时间工作不伸直、不划伤、不氧化,所以芯头必须具有足够的强度,而且不产生氧化铁皮。根据这种要求,通常选用耐热不起皮钢作芯头。 4 hot push elbow production tools Hot elbow bend the main production tools are the core head and plastic mold. 4.1 core head material and size design 4.1.1 core material and production methods to ensure that the elbow bend the heat and the inner surface of the quality requirements of the core head at high temperatures for a long time does not work straight, not scratched, not Oxidation, so the core must have sufficient strength, and does not produce scale. According to this requirement, it is usually used as heat-resistant leather core.