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在研究了高效磨削时弧区热作用机理的基础上,将热工领域有关强化传热的思想引入磨削加工,并具体提出了利用高压水射流冲击强化弧区换热的独创构想.为考查该项构想可能提供的极限换热能力,完成了关于高压水射流冲击强化换热的传热学基础试验研究,试验用射流速度最高达到110m/s.瞬、稳态试验结果证明,水射流冲击的临界热流密度和换热系数相对于池内沸腾可分别提高70和30倍以上,其中临界热流密度的绝对数值更是高达80W/mm2以上.随后介绍了专门设计研制和调试成功的可限制高压水只在弧区范围内作径向射流冲击的实验装置,以及利用该装置完成的采用径向水射流冲击供液的缓进给磨削试验研究.试验结果确证,引入弧区的水射流冲击确有超常的强化冷却效果,它可在普通供液已严重烧伤的情况下将工件表面温度轻松地维持在100℃以下的超低水平上.
On the basis of studying the thermal action mechanism of arc zone during high-efficiency grinding, the idea of heat transfer enhancement in the field of thermal engineering is introduced into the grinding process, and the original concept of heat transfer enhancement by high-pressure water jet impinging arc zone is proposed. The basic experimental study on the heat transfer of high-pressure water jet impingement heat transfer was carried out to investigate the limit heat transfer capability that this concept may provide, and the experimental jet velocity was up to 110 m / s. The transient and steady-state test results show that the water jet The critical heat flux and heat transfer coefficient can be improved by more than 70 and 30 times, respectively, compared with the boiling in the pool, of which the absolute value of the critical heat flux density is as high as 80 W / mm2, followed by the introduction of specially designed, Water only in the arc area for radial jet impact experimental device, and the use of the device to complete the use of radial water jet impact on the feed to slow feeding grinding test results confirm that the introduction of arc water jet impact It does have superb cooling enhancement that easily maintains the surface temperature below a very low level of 100 ° C when the common liquid supply has been severely burnt.