Well-known, the geometrical appearance of blade of cutting tool cutting is the crucial factor that decides its machine efficiency. Generally speaking, the blunt round radius that increases cutting sword conduces to more efficient excision metal stuff, prolong cutting tool life. Scientific research orgnaization and tool manufacturer already had exhaustive research to among them mechanism. Simple for, the sharp cutting blade that contains grinding blemish and burr is in cutting is initiative level is very incidental collapse blade, cause local point to quicken damaged. Cut the labor of stress to make clear to chafing all round cutting blade, the ply that cut bits is reduced as the accretion of radius of cutting blade blunt circle. Increase radius of point blunt circle to be able to reduce cutting tool and the osculatory length that cut bits and quantity of heat to accumulate greatly, thereby slow down cutting tool wears away. What company of graph 1 Vapormatt develops is wet support of 1 contemporary cutting tool exceeds gush arenaceous opportunity good appearance coating (like TiN or CrN coating) will improve its cutting performance. Use deposit of physical gas phase (PVD) or deposit of chemical gas phase (CVD) the hardness that these coating of besmear Fu can show craft to raise sword of cutting tool cutting and durable sex. The hardness as a result of these coating (be as high as HV3400) the hardness that should compare base material normally (hard alloy is HV1700 about) one times taller, accordingly, the adhesiveness between coating and matrix often becomes one of limitative factors of cutting tool life. Accordingly, the radius of point blunt circle of cutting tool matrix and its surface are bright and clean degree of final performance to cutting tool is crucial. Incline to of coating deposit craft at be in sharper point handles deposit more material. Accordingly, radius of lesser point blunt circle can attract larger deposit. Because this area is met when cutting workpiece,bear huge stress, because this produces crackle more easily, make the initiative point that quickens damaged subsequently. Raise the adhesiveness between coating and matrix for utmost ground, matrix surface must very clean. Be in the name is " through small spurt arenaceous improvement the cutting function of film of tall adhesiveness PVD on hard alloy razor blade " in research, researcher discovery, pass grinding merely and can not offer obtain good coating adhesiveness needs ideal surface is bright and clean degree. Accordingly, bit needs to undertake grinding normally + small spurt arenaceous or polishing + small spurt sand preparation. Consider to discover, polishing + the effect of small spurt sand preparation is better (in these two kinds of processing techniques, small spurt is arenaceous all use dry type spray arenaceous) . Graph the gush arenaceous head in 2 jobs studies in this the project is medium, the measurement of bit surface adhesiveness means is to undertake repetition declining pounding a test, till exterior damaged. Also can use contrast to test a standard (simple C Rockwell hardness tests a standard) will observe the damaged condition all round impress. The adhesiveness of coating is 6 grade to HF6 cent from HF1 (HF1 states adhesiveness is best) . Wet a small spurt is arenaceous main benefit is: Can cross much cobaltic bond from bit surface purify, these cobaltic bond may produce adverse effect to the adhesiveness of exterior coating. However, use wool to brush brush or the means with dry arenaceous in season obtains radius of point blunt circle to be able to be on matrix accumulation is electrostatic, accordingly, must of will electrostatic adsorption drossy or dirt keeps clear of clean from bit surface. Now, vapormatt company (cooperate with other tool manufacturer) discovery, to gain face of the pretreatment before the coating of high quality, can use wet gush is arenaceous will replace two class polish and craft of sand preparation of dry type gush. Use wet gush arenaceous technology, can achieve the coating adhesiveness of HF1, and cutting tool surface won't produce electrostatic or adsorptive dust. Use wet gush is arenaceous the pretreatment before having coat to hard alloy cutting tool (undertake rinsing mixing on wheeler of gush sand preparation especially dry) a main advantage is: The cutting tool surface after processing provides active extremely. In fact, its surface active is such tall, so that show some exterior active measurement unit (if measure horny system or way of test of Dyne printing ink) cannot undertake determining to its (measure threshold value because of what exceeded an instrument) . This kind of active surface enhanced the adhesion of coating further. Before having coat successfully wet a key of gush sand preparation is to pass technology control, ensure the consistency of clean surface, include to undertake rinsing, going ionic (DI) the full in water is blown instantly dry. Graph the razor blade after 3 gush sand preparation must undertake cleaning mixing profit from of matrix of cutting tool of dry no less than is small technology of gush sand preparation is same, itself of coating cutting tool also is benefited from which blame is shallow. The researcher of afore-mentioned projects is opposite respectively use grinding + small spurt arenaceous craft and polish + the bit of hard alloy mill that small spurt arenaceous craft handles had a test. Filmy to passing the PVD of sand preparation of Tu Houwei gush research makes clear, a material exists to be out of shape in coating the shallow surface layer with tall hardness of rice of big, accept (its deepness is about 0. 6 μ M) . Craft experiment used arenaceous pressure of two kinds of gush respectively (2 cling to and 5 cling to) , the result makes clear, 5 cling to the hardness that gush arenaceous pressure can increase shallow surface layer. Subsequently, undertook to coating razor blade milling experiments. In the experiment, measured bit hind knife face wears away, and will hind knife face wears away achieve 0.
2mm set discards as useless for cutting tool standard. Through grinding + the cutting tool life of the bit sample of small spurt sand preparation lengthened 15 ％ at most, and through polishing + small spurt sand preparation (usable and wet small spurt arenaceous pretreatment is replaced) the cutting tool life of bit sample lengthened 70 ％ at most (gush arenaceous pressure is 5 cling to when) . Wear away through the examination trace, undertake to relevant stress finite yuan of analysis, decided two kinds of disparate cutting tool failure mode. To passing grinding + the cutting tool sample of small spurt sand preparation, the main reason of invalidation is the adhesiveness inadequacy of PVD coating; And to polishing + the cutting tool sample of small spurt sand preparation, failure mode is the fatigue be caused by inside PVD coating. Accordingly, small spurt is arenaceous after besmearing to pass the accept rice hardness that raises PVD coating, make treatment benefit the greatest thereby change, still must undertake the pretreatment before reasonable besmear. The automation that has appeared on the market is wet gush arenaceous product line can come true all these functions, the Tu Qian that includes point to pour coating of round, PVD/CVD and besmear aftertreatment, rinse, go ionic water rinse and follow-up are dry. For beautiful for the purpose of, bit should undertake sparge is rinsed, clean and blow with hot air dry, make its reach the level of the put in storage that pack. Through wet gush is arenaceous be opposite a dish (200) the time that typical razor blade has point pours round processing is 4, 20 minutes, depend on wet gush arenaceous machine needs to complete step of how many craft. The time that undertakes to coating Tu Qian and besmear aftertreatment need is point to pour a circle to handle the 1/2 of time about. CNC Milling
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