针对汽车底板热锻模具模膛较深并且狭窄,生产过程中锻件冷却快,模具容易发生断裂失效、顶杆磨损、出模困难等问题,利用Deform软件对原始锻模进行数值模拟。分析结果表明,汽车底板外形复杂、模腔深且窄,导致模具应力较大,容易发生断裂;顶杆孔位置不合理,导致顶杆易磨损,锻件顶出困难。通过采用优化模具成形面结构、调整顶杆孔位置及改进工序等方法,使预锻模具应力和终锻模具应力分别降低200和120 MPa。实际生产中,模具寿命由试制时的40件左右提高到现在的3705件以上,同时生产效率得到提高,出模也较容易。 In order to solve the problems that the die forging die of vehicle floor is deep and narrow, the forging is rapidly cooled in the production process, the die is prone to fracture failure, the wear of the mandrel and the die are difficult to be solved. Deform software is used to simulate the original die. The results show that the shape of the car floor is complex, the cavity is deep and narrow, which leads to the stress of the mold is large and the fracture easily occurs. The location of the mandrel is unreasonable, leading to the wear of the mandrel and the difficulty of ejecting forgings. By adopting such methods as optimizing the structure of the forming surface of the mold, adjusting the location of the jack hole and improving the process, the stress of the forging die and the die of the final die are respectively reduced by 200 and 120 MPa. In actual production, the service life of the mold is raised from about 40 pieces at trial to more than 3705 pieces at the moment, and at the same time, the production efficiency is improved and the mold making is easier.