气门摇臂是发动机进、排气系统的一个重要部件,在工作中长期承受高速交变载荷和冲击性载荷,可靠性和耐久性一直是汽车工作者关心的一个问题。要求摇臂具备较高强度、耐磨性、耐热性及减震性,因此摇臂材料的选用和控制显得尤为重要。1铸件结构与存在的铸造缺陷我公司接到一批气门摇臂的外方订单。原为锻件,客户拟改为铸件,要求抗拉强度>600 MPa,耐磨,硬度230 HB以上,且有一定的韧性,并透露国外几家 Valve rocker arm is an important part of the engine intake and exhaust system. It has long-term alternating and high-speed alternating load and impact load at work. Reliability and durability have always been a concern for auto workers. Rocker arm requires a higher strength, wear resistance, heat resistance and shock absorption, so the rocker arm material selection and control is particularly important. Casting structure and the existence of casting defects I received a number of companies outside the valve rocker orders. Originally forgings, the customer intended to be cast, requiring tensile strength> 600 MPa, wear-resistant, hardness 230 HB or more, and have some toughness, and revealed that a few foreign