热压钻头烧结过程温度场分布研究

Analysis on Temperature Distribution during the Hot Pressing Sintering for Bit

摘要:

设计了3种烧结温度和2种升温速率，利用仿真分析软件CFD对热压钻头烧结过程的温度场分布情况进行了分析。结果表明：烧结温度、升温速率和保温时间对烧结过程的温度场分布均存在影响。随着烧结温度的升高，石墨模具和钻头胎体间的温度差异也随之增大。在一定范围内，温度差会随着升温速率的升高而减小。由于温差的存在，保温时间应该根据模具壁厚、钻头规格和胎体配方进行综合考虑。

关键词:热压金刚石钻头;温度场;热传导;烧结

Abstract:

This paper discussed the simulation which is on the basis of the CFD software, including 3 different temperatures and 2 different heating rates; and analyzed the distribution of the temperature field during the hot pressing sintering for bit. The simulation shows that the sintering temperature, heating rate and holding time have effect on the temperature distribution. The temperature differences between graphite mould and bit matrix rises when the sintering temperature rises. Within certain limits, the temperature difference will reduce as heating rate increases. As a result, the holding time should be considered based on the mould thickness, bit specifications and mould formula.

Key words:hot pressing diamond bit; temperature field; heat conduction; sintering