Design And Simulational Analysis On Heat Exchanging Capacity Of Heat-Pipe Grinding Wheels For High Efficiency Grinding

In grinding processing, the grinding energy used for materials removal almost entirely converted into heat, which accumulates in the grinding area. Especially for difficult-to-machine materials concerned in high efficiency grinding, high material removal rate need more energy input, at this moment the grinding area will produce more heat. Right now, if we cannot take proper cooling method to ease out the heat timely, the processing temperature will increased significantly, which will affect surface quality of the workpiece, seriously, make workpiece burn. In fact, it was the burn problem of workpiece in the processing zones of high temperature largely limits application to the high efficiency grinding technology for difficult-to-machine materials.As a kind of efficient heat transfer components, heat pipe can transfer heat fast with a small temperature gradient through the phase change of its internal work substance. Owing to its high heat transfer efficiency, heat pipe is known as "heat superconducting". Because of its excellent heat transfer performance, heat pipe has been widely applied in the energy, aviation, machinery processing etc.Aiming at the high temperature burn problems in the high efficiency grinding process, according to the working principle of the radial rotary heat pipe, we design and produce heat-pipe grinding wheel, expect using its excellent heat transfer performance to control the temperature in the grinding area effectively and promote the application and development in high efficiency grinding technology for difficult-to-machine materials. This paper studies the main content as follows:(1) According to the demand of design, heat-pipe grinding wheel is manufactured. According to the grinding wheel matrix of process characteristics, designed and produced the heat pipe vacuum pumping, grinding wheel fluid filled and end closure device, accomplish the test of heat pipe vacuum pumping, grinding wheel fluid-filling and the tail sealing tool. The heat pipe grinding wheel's vacuum sealing performance is verified.(2) According to the work of grinding heat pipe, use FLUENT ,which is a dedicated CFD software numerical fluid heat pipe grinding wheel, to establish grinding numerical model of the grinding wheel's temperature field, check on the model grid, set the desired boundary conditions and select the appropriate equation solver.(3) In process of the study,the influence of heat flux density of the grinding area, parameters of the cold fluid and rotating speed of the grinding wheel on the temperature field was analyzed. Providing the basis for the test to choose the appropriate parameter combination. With the same parameters, by using different cooling patterns, such as water-cooled and wind-cooled cooling, the influence of grinding temperature field under these two cooling patterns can be found. The simulation results show that the pattern of water-cooled cooling can get better cooling effect under the existing laboratory conditions, which provides the basis for the reasonable combination of parameters.