Research On The Near Dry And The Action Mechanism Of Lubircation In Deep-hole Drilling System

The deep-hole drilling is a special machining technology．The special deep-holedrill(for example gun-drills，BTA, the ejector drill, the core drills and so on)andmachine tool must be used in the modern deep-hole drilling, and the massivecutting-oil must be used to cooled drill and removed chip in the processing. Thecutting-oil is also used to extend tool life and enhance machining efficiency andsurface finish during drilling.However, conventional cutting fluid also have bad effecton environmental、health problem and the increase of production costs.With environment protection awareness enhanced and laws enforced, thenegative influence that the cutting fluid application brought has become a great barrierfor mechanical industry development. Green cutting has become focus of attention inmanufacture field in the21th century. The investigation of pollution-free andeco-friendly green cutting technique has been predominant emphasis in each country.So that, the near dry drilling will be one important development trend of the deep holedrilling technology．Because Oils on water (OoW) cutting fluid is cheap, pollution-free, eco-friendlyand no recovery, the cutting technology that OoW cutting fluid is used as coolants andlubricants is a new green cutting technique. It utilizes compressing air strong role,minim nature decomposable plant oil and water create minim Oils on water (OoW)cutting fluid in the specialness multipart nozzles. According above, a research onaction mechanism and experiments with OoW as coolant and lubricant in deep-holedrilling system is issued. Researching results of theory significance and applicationvalue have been drawn.The dissertation takes the inner chip-removing deep-hole drilling as the researchobject, unifying the near dry-machining technology，the OoW cutting fluid is used tolubricated and cooled cutter and help to remove chip．The research result show that itsaves the energy, reduces the production cost and environmental pollution, has thegood economic and the social efficiency.Main contents and conclusions：(1) The near dry deep hole drilling system with OoW technology has been established base on analyzing the green cutting technique. In the the system, OoWcutting fluid is used to lubricated and cooled cutter, DF (Double Feeder) system isused as foundation.(2)The investigation of action mechanism is researched with OoW cutting fluidsas coolants and lubricants. OoW cutting fluids fills up capillary in cutting zone withgaseous state because of canceling infiltration and evaporation explosion of liquidphase, and OoW cutting fluids penetrates capillary time less than liquid phase cuttingfluids. As the plant oil molecular will generate absorption and chemical reaction thatOoW cutting fluids forms boundary lubrication layer in capillary because of severetool-chip contact friction mechanical action and clear metal surface catalysis. Theplant oil of OoW cutting fluids will react to metal surface to generate metallic soaps,and metallic soaps can weaken the interactivity between tool bulk material and chip.OoW cutting fluids has high force-convection heat transfer coefficient and directlyreduces cutting temperature, and OoW cutting fluids has direct cooling action, thestress and length of tool-chip interface are reduced by OoW cutting fluids lubricatingaction, and the cutting thermal is decreased, and OoW cutting fluids has indirectcooling action. Under the conditions of indirect and direct cooling action, the cuttingtemperature is reduced obviously. This topic study chip-removeal Characteristics ofthe deep hole machining system and related tools and technology, provide atheoretical basis to the application of OoW cutting fluid as cooling the lubricationmedium for green cutting technology.(3) The research on experiment with OoW cutting fluids as coolant and lubricantis taken as important problem to research. It provides an instance of green cuttingtechnology application of OoW cutting fluids as coolant and lubricant.Mechanism theory analysis and experimental results are taken into account, theOoW cutting fluid has well lubrication effect. Accordingly， the near dry deep-holedrilling System with OoW technology as cleaning effective drilling mode has greatpossibilitiesInnovations：(1) In analyzing the action mechanism of OoW cutting fluid, the capillary theoryand the theory of chemical adsorption are introduced pioneeringly. As a result, the roleof its components is discussed in detail.(2) The mathematical model of injection pump has been established for near-drydeep-hole drilling system. And based on the model，method is put forward for the structure modification of traditional jet pump.(3) A complete and practical physical model of near-dry deep-hole drillingsystem is constructed base on OoW technology in this dissertation.