退火套合残余应力的计算模型及试验研究

• 作 者: 陈海辉 臧观建 曾莹莹 钟汉通
• 机 构: 井冈山大学化学化工学院,清华大学化学系,井冈山大学机电学院,华南理工大学机械与汽车工程学院,
• 出 处: 金属热处理
• 发表日期: 2014年10期
• 关键词: 套合 计算模型 残余应力 筒体 衰减率 退火 预应力 容器 试验研究 计算误差

为了从理论上指导退火消除套合筒体的套合应力,推导出套合残余应力衰减模型。采用一次切削残余应力释放方法,测量筒体退火前、退火后内外壁面的残余应力沿圆周和轴向的变化,来验证残余应力的衰减规律。试验显示套合预应力理论计算误差在10%以下;外筒外壁平均残余应力测量值为48 MPa,衰减率为61%,而模型预测数值为23 MPa,预测衰减率为79%;内筒内壁平均残余应力测量值为-28 MPa,衰减率为73%,而模型预测数值为-23 MPa,预测衰减率为78%。结果表明,该退火消除套合应力的计算模型,可作为套合筒体退火去应力工艺的理论依据;套合容器必须进行消除或降低套合预应力的退火热处理。

In order to theoretically guide the annealing to eliminate the stress of the sleeve, the model of the residual stress attenuation of the sleeve was deduced. A method of cutting residual stress release was used to measure the variation of residual stress in the circumferential and axial directions before and after annealing. The experimental results show that the calculated error of sleeve prestress theory is less than 10%; the average residual stress of the external wall is 48 MPa, the attenuation rate is 61%, while the model predictive value is 23 MPa, the predicted attenuation rate is 79% The average measured residual stress is -28 MPa with a decay rate of 73%, while the model predictive value is -23 MPa with a predicted decay rate of 78%. The results show that this model can be used as a theoretical basis for the process of annealing and stress relieving of the sleeve body. The sleeve container must be annealed and heat-treated to eliminate or reduce the prestress of the sleeve.