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Numerical simulation of heat transfer during leaf spring industrial quenching process

机译：叶弹簧工业淬火过程中传热的数值模拟

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摘要

This study is carried out in partnership with the company CAVEO, manufacturer of leaf springs for vehicles. It concerns the development of a numerical model intended to follow the space-time temperature evolution of a leaf during two processing operations: hot cambering and quenching. This leaf is of a parabolic profile, made of EN-51CrV4 steel (AISI-6150). After austenitization, it passes through a cambering operation to confer it the desired deflection and then a quenching operation. This quenching is carried out in an oil bath to achieve better mechanical properties. The prediction of the temperature during quenching involves determining the heat transfer coefficient between the leaf and the oil bath. This coefficient is determined by quenching, under the same conditions as the leaf, using a standard probe of the same steel. The numerical model is based on the resolution of the transient heat equation by considering the heat loss flows towards the heterogeneous environment (ambient air, press contact and quenching oil). The results obtained by this model give the spacetime temperature evolution of the leaf from the exit of the heating furnace to the exit of the oil bath. The numerical results are compared to the experimental profiles obtained through thermographic images throughout cambering and quenching operations. These results are consistent with experimental results.
机译：本研究与公司披露汽车制造商合作开展了车辆的制造商。它涉及在两个处理操作期间遵循叶子的时空温度演变的数值模型的发展：热弯曲和淬火。该叶子是抛物面的剖面，由EN-51CRV4钢（AISI-6150）制成。在奥氏体化之后，它通过弯曲操作来赋予所需的偏转，然后赋予淬火操作。该淬火在油浴中进行，以获得更好的机械性能。淬火期间的温度预测涉及确定叶片和油浴之间的传热系数。使用相同钢的标准探针在与叶子相同的条件下淬火确定该系数。数值模型通过考虑朝向异质环境（环境空气，压接触点和淬火油）来基于瞬态热方程的分辨率。通过该模型获得的结果使得叶子的间隔温度演变从加热炉的出口到油浴的出口。将数值结果与在整个弯曲和淬火操作中通过热成像图像获得的实验配置结果进行比较。这些结果与实验结果一致。

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