Research On Optimal Design And Simulation Of Negative-Pressure Chip Removing Device In Near-Dry Deep Hole Processing

In process of machining, cutting fluid is usually used to reduce cutting force, lowercutting temperature, extend tool life and enhance machining efficiency and surface finishquality. However, anything has two sides. Conventional cutting fluid not noly has bad effectson environment and health, but also increases production costs. The current attention on theenvironmental impacts of machining process by people has been forcing manufacturers toreduce or eliminate the amount of wastes. Therefore, more and more new green cuttingmethods are being the focus of attention in manufacture field in the21th century. Becausenear-dry deep hole processing is pollution-free, eco-friendly and no recovery, it is a newgreen cutting technique. Near-dry deep hole processing system combines the advantages ofgreen lubrication and cooling and the characteristics of deep-hole processing. The system’scooling and lubrication medium is the atomized cutting fluid, in addition to the compoundspraying device and negative-pressure chip removal device. In this case, it is necessary andsignificant to adopt the method of near-dry deep hole processing.In this paper, the main contents are as following:(1) Studying on working mechanism of atomizer provides a basis for the design ofatomizer. By means of the lubricating film and the border lubrication’s model to elaborate thelubricant mechanism and build the model of the atomized cutting fluid’s border lubrication.The thermal energy equation of atomized cutting fluid is built based on the heat diffusiontheory. And we deliberate the atomized cutting fluid’s cooling mechanism.(2) The study of negative simulation is made on negative-pressure chip removingdevice by FLUENT of CFD. The results of negative effect in traditional wet and the near-dryprocessing confirms that the near-dry lubrication is feasible in negative-pressure chip removing device of deep-hole drilling.(3) This paper presents the fluid characteristic equation with DF structure and developsthe negative-pressure chip removing device with improved structure. On this basis, the use ofFLUENT software analyses and makes a poignant contrast of ordinary and improvednegative-pressure chip removing device in near-dry deep hole processing, verifying theprominent improvement of negative pressure effect and the ability of chip removal in path.