Warm and hot stamping of ultra high tensile strength steel sheets using resistance heating
Warm and hot stamping of ultra high tensile strength steel sheets using resistance heating
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DOI：
10.1016/s0007-8506(07)60085-7
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发表时间：
2005-01-01
影响因子：
4.1
通讯作者：
Tanaka, Y
中科院分区：
文献类型：
--
作者：
Mori, K;Maki, S;Tanaka, Y
为了改善超高强度钢板的回弹和成形性能，开发了一种电阻加热的温热冲压工艺。在该方法中，通过利用电阻直接加热设置在模具中的板，即所谓的焦耳热，来防止成形前板的温度降低。由于加热到800摄氏度的时间仅为2秒，因此电阻加热足够快，可以与压力机同步。研究了加热温度对超高强度钢板回弹和成形性能的影响。采用加热的方法消除了高强度钢板帽形弯曲时的回弹。此外，通过加热成功地拉伸了具有980MPa的拉伸强度的超片材。加热温度在600 ℃左右是最佳的，因为回弹和氧化小，硬度增加。
A warm and hot stamping process of ultra high tensile strength steel sheets using resistance heating was developed to improve springback and formability. In this process, the decrease in temperature of the sheet before the forming is prevented by directly heating the sheets set into the dies by means of the electrical resistance, the so-called Joule heat. Since the heating time up to 800 degrees C is only 2 seconds, the resistance heating is rapid enough to synchronise with a press. The effects of the heating temperature on the springback and formability of ultra high tensile strength steel sheets were examined. The springback in hat-shaped bending of the high tensile strength steel sheets was eliminated by heating the sheet. In addition, the ultra sheet having a tensile strength of 980MPa was successfully drawn by the heating. The heating temperature is optimum around 600 degrees C due to the small springback and oxidation and the increase in hardness.