【摘要】 针对大型钢锭在第三类边界条件下的加热过程进行分析,利用加热时温度沿钢锭横截面的分布变化和由温度梯度导致的钢锭瞬时热应力计算方法,建立了加热过程中钢锭径向、横向和切向的瞬时应力模型。在瞬时应力模型的基础上,根据钢锭在某一温度下的屈服强度和加热炉温度值,提出了控制钢锭加热速度的计算式。用此计算式计算加热工艺参数,可以有效控制钢锭在加热过程的温升速度,避免钢锭在加热过程中产生裂纹,该计算方法已在某特殊钢锻造厂得到实际应用,生产实践证明该方法可行。更多还原

【Abstract】 The large steel ingot heating process under the third boundary condition was analyzed.The transient heating process of steel ingot radial,transverse and tangential stress model was established by the calculation method for the heating temperature distribution changes along the ingot cross-section and ingot transient thermal stress caused by the temperature gradient.Based on the instantaneous stress model,according to the ingot temperature yield strength and heating furnace temperature value,a formula was proposed to control the ingot heating speed.The heating process parameters calculated with this method can effectively control the ingot temperature rising speed to avoid the ingot cracks in the heating process.The method has been applied in some special steel forging factories and the production practice has proved that the method is feasible.更多还原