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首页> 外文会议>ASME international manufacturing science and engineering conference >Investigating a Die Quench Cracking Problem in 52100 Steel Bearing Rings with Computer Simulation
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Investigating a Die Quench Cracking Problem in 52100 Steel Bearing Rings with Computer Simulation

机译：用计算机模拟研究52100钢轴承套圈的淬火裂纹问题

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Quenching using a press with controlled die loads, commonly referred to as press quenching, is a specialized technique used to minimize distortion of critical components such as gears and high quality bearing races. Improper press load magnitudes or timing of the load application may restrict part movement during quenching to the point of imposing stresses that cause cracking, especially in a common bearing steel such as AISI 52100, high carbon, high strength steel. This paper applies a finite element based heat treat simulation tool, DANTE~®, to investigate the sensitivity of cracking to press quenching process parameters. The typical method for designing a press quench process to control flatness, out-of-round, and taper is by experience coupled with trial-and-error. This is accomplished by adjusting oil flow rates, flow directions, die loads, and the timing of die loads. Metallurgical phase transformations occur during the quenching process as austenite transforms to martensite and possibly to diffusive phases. Thermal contraction due to cooling and volumetric expansion due to the phase changes therefore occur simultaneously during the heat treating process. A constantly changing stress state is present in the part, and improperly applied die loads, oil flow or oil flow rate can add additional stress to result in cracking. An inconsistent cracking problem in an AISI 52100 bearing ring was evaluated using production trials, but the process statistics were not conclusive in identifying the source of the problem. Heat treatment process modeling using DANTE was used to investigate the effects of quench rate, die load pulsing, and several other process variables to determine how these parameters impact the resulting stresses generated during the press quenching operation.
机译：使用具有受控模具负载的压力机进行淬火（通常称为压力淬火）是一种专门技术，用于最大程度地减少关键零件（如齿轮和高质量轴承座圈）的变形。压机载荷大小或载荷施加时间不当可能会限制淬火过程中的零件运动，以至引起产生裂纹的应力点，特别是在诸如AISI 52100，高碳，高强度钢之类的普通轴承钢中。本文使用基于有限元的热处理模拟工具DANTE〜®来研究裂纹对冲压淬火工艺参数的敏感性。设计冲压淬火工艺以控制平面度，不圆度和锥度的典型方法是结合经验和反复试验。这是通过调节油的流速，流向，模具负载和模具加载的时间来实现的。冶金相变在淬火过程中发生，因为奥氏体转变为马氏体，并可能转变为扩散相。因此，在冷却过程中同时发生由于冷却引起的热收缩和由于相变引起的体积膨胀。零件中存在不断变化的应力状态，并且不正确地施加模具载荷，油流量或油流速会增加额外的应力，从而导致开裂。使用生产试验评估了AISI 52100轴承套圈中不一致的开裂问题，但是在确定问题根源方面，过程统计数据尚不确定。使用DANTE进行的热处理过程建模用于研究淬火速率，模具负载脉冲和其他几个过程变量的影响，以确定这些参数如何影响冲压淬火过程中产生的应力。

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