The high accuracy of the machine tool is changed

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Css" Type=text/css Rel=stylesheet> wants to rotate in high speed main shaft while wear away cutting tool fall to retreat knife face to wear away to several µm(degree) , realize long cutting, must take the feed rate that keeps stable when processing imperceptible form to the machine tool, fall the to knife head concussion when cutting to minimal wait for countermeasure. Institute of Japanese manage chemistry and sanded Dick (the experiment machine tool that Sodick) begins to use bilateral and joint development from 2002 launched relevant attempt. Experimental machine tool uses main shaft rotate speed to be the air turbine drive of 200 thousand Rpm, to raise the oscillatory precision of head of cutting tool knife, used the direct card that is based on shrinkage fitting to tighten means. Still pass cutting tool of direct on main shaft installation additionally, accumulate in order to avoid the error that cutting tool adjusts exercise to bring, make oscillatory precision and heat are out of shape control was in 0.

3µm less than. Drive system uses linear motor, acceleration character is X axis and Y axis 1.

1G of axis of 5G, Z, can realize quick feed action. Explain incidentally; Common collet means is 10µm ～ 20µm in precision of the vibration when high speed rotates, and want way of instead shrinkage fitting only ameliorable to 3µm ～ 4µm. Come with motor of air turbine and rather than because motor meeting becomes pyrotoxin,drive main shaft is. If be normally the word of thick cutting tool, with motor drive won't have a problem, but when using extremely fine cutting tool, want to have effect of quantity of heat a bit only, cutting tool can produce heat to bilge. Because the set of approach counts µm only originally, accordingly even if the cutting tool heat of several µm bilges, also need to prevent. According to the cutting test result that experimental machine tool achieves, sanded Dick development went MC " AZ150 " (appeared on the market in December 2005) and " AZ250 " (appeared on the market in November 2008) . Compare with original MC photograph, those who realized 10 times above is efficient, and the treatment that still can realize precision of class of rice of one digit accept on average range surface roughness and appearance. This is to use main shaft rotate speed to be 120 thousand Rpm and the hot deflection of Z axis direction is out of shape in the low heat under 1µm the main shaft, double axis that is based on motor of complete axes sex is opposite drive feed orgnaization, and direct control (can try to narrate later) formation new crankshaft. Two axes deserve to have the layshaft that is identical weight with treatment stage relative to drive feed orgnaization, can do retrorse exercise with treatment stage. Both the centre of gravity place that shuts won't produce change, can offset easily after high speed feed urgent the vibration that when stopping, produces. Still guided the cutting tool clip that uses the shrinkage fitting means that induction of high frequency electromagnetism heats runs unit additionally, and the system that can have is not osculatory plan measuring to part of blade of cutting tool cutting (graph 1, graph 2) . Graph the construction of the head of 1 main shaft axis that uses shrinkage fitting means is developed by NAKANISHI. Heat through induction coil of high frequency electromagnetism after clip holds a share, its caliber can expand, can assemble and unassemble accordingly cutting tool. Heat time is 10 ～ 15 seconds. The graph determines inside the machine of 2 cutting tool the system undertakes is not osculatory determining to the wear extent of cutting tool, reach correction. Work place detects with contact bougie, bougie itself also like cutting tool, undertake in order to be not osculatory means determining. Henceforth as satisfy the requirement that exceeds imperceptible nicety to machine further, the level that reachs the cutting tool that loses sight of almost with naked eye to undertake cutting, meet even at the appointed time cannot inspect through eye will affirm cutting in the begining be close to a movement. The designation of cutting tool movement will be dictated by the program certain way develops forward, because will want this henceforth,take the step that will prevent cutting tool collide through the method such as imitate and sensor. Additional, the heat that solving machine tool and workpiece is out of shape when the problem, machining cutting fluid has circulated all round place, perhaps will make efficient instrument in the practice of the cutting in cutting fluid. Because be versed in to adding the temperature of place has direct control very hard, because the target this henceforth is,use the cutting juice that gets temperature government to maintain temperature stability. CNC Milling CNC Machining