针对轮毂结构较复杂、壁厚差异大及材质技术要求高的特点，需要进行合理的铸造工艺和等温淬火热处理 工艺设计，以生产出优质轮毂铸件。通过确定合适的浇注位置和分型面，进行了砂芯、模样布置及浇冒系统设计。为满足 轮毂本体不同部位硬度的差异性要求，将轮毂齿轮中心孔设计为不铸出孔(热处理后加工出齿轮孔)，并缩短等温淬火保 温时间，即900℃×2h奥氏体化后，在硝酸盐池中进行280℃×35min等温淬火处理。开发的轮毂铸件外观质量好，未发 现明显缩孔缩松、夹杂、气孔等铸造缺陷。

On the basis of the complex structure, large differences in wall thickness, and stringent material technology requirements of wheel hubs, rational casting and isothermal quenching heat treatment processes for the production of high-quality wheel hub castings are necessary. In this study, the appropriate pouring position and parting surface were determined, followed by the design of the sand core, pattern layout, and gating system. To meet the hardness requirements in different parts of the wheel hub, the gear hole in the center of the wheel hub is designed as a non-cast hole (machining into a gear hole after heat treatment), and the holding time of isothermal quenching is shortened; that is, after 900 ℃×2 h austenitization, it is subjected to 280 ℃×35 min isothermal quenching treatment in a nitrate pool. The developed wheel hub casting has good appearance quality, and no obvious casting defects such as shrinkage cavities, porosity, inclusions, and gas pores have been found.