The design wheel load of gate of large and planar steel is big, gyro wheel action can produce very tall contact stress on orbit, tall to demand of orbital data strength. Orbit bears the wheel load load that gyro wheel transmits has certain concussion and oscillatory effect, orbital material should have good plasticity and tenacity. Use experience according to actual project, appropriate chooses alloy cast steel to make, and need to be opposite material undertakes moving pledging or other means has heat treatment, in order to improve the integrated and mechanical performance such as the plasticity of material, tenacity. When specific project is designed, should choose uses rolled steel according to computational stress, plasticity and tenacity requirement. When wheel load bigger, plasticity demand is higher, strength demand is not too high when, can use ZG50Mn2; to become when strength demand is higher, but ordinal by go up to choose to next order. Steel gate is opened when shutting, below very big wheel load effect, very great local contact stress and clash produce between gyro wheel and orbital surface. Gyro wheel and orbital job character ask Gaojunai grinds their surface hardness the gender is good, in-house plasticity and tenacity are good, namely the spare parts expresses hard Li Ren. Should have different and mechanical property to this kind of the outside and the inside, in order to get used to the spare parts of different need, the tenacity that component part interior basically considers when select material asks, can undertake normalizing to rolled steel or move qualitative processing, make its satisfy the design requirement such as plasticity, tenacity, intensity. CNC Milling