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为了降低发动机气缸盖的热负荷，在气缸盖排气道内铸入外壁喷涂陶瓷的钢壳。钢壳的形状尺寸尺厚度均匀性要求严格。应用计算机建立精确的三维数学模型，并用高精度数控铣床加工出铸造用模具。最后，用精密熔模铸造法加工出符合要求的不锈钢钢壳。
In order to reduce the thermal load on the cylinder head of the engine, a steel shell of ceramic coating the outer wall is cast in the exhaust passage of the cylinder head. Shape of the steel shell Thickness uniformity requirements are strict. Using computer to build precise three-dimensional mathematical model, and using high-precision CNC milling machine mold casting. Finally, the precision investment casting process to meet the requirements of stainless steel shell.