Technical level difference analyses domestic and international high-powered machine tool to use bearing

1. Horn contacts domain of main shaft of ball bearing report

Home has a level: In machining center and respect of main shaft of report of numerical control milling machine, luoyang bearing institute developed oil gas to lubricate model main shaft of machining center report, rated power and 22kW of highest turn up, 24000r/min; Main shaft of report of the permanent magnetism synchronism that Hunan university develops machining center, rated power 35kW, 18000r/min of top rotate speed, radial round jumpy 1.5m, g0.4 of dynamic balancing precision, deploy HSK – A63 knife handle, use oil gas to lubricate with compulsive water-cooling means. Ball bearing of pottery and porcelain of high-power of high speed of development of Shenyang building university highest turn up reachs unit of electric main shaft 30000r/min, power amounts to 20kW; Those who develop development without unit of main shaft of report of complete pottery and porcelain of inner ring type top rotate speed achieves 30000r/min, most high-power achieves 15kW, circumgyrate precision 1m. Grinding respect of the main shaft that use phone, value of Dmn of product of main shaft of Luoyang bearing institute achieves 170 ~ 2 million Mmr/min; Bearing ferrule grinds the main shaft that use phone most high-power is amount to 32kW (S6 ~ 60% ) , top rotate speed is 120000r/min; Path board grinds Gao Tie course to amount to 150kW with electric main shaft (S1 ~ 100% ) , 2000r/min of top rotate speed; Working life general is ubiquitous 1500 ~ 2000h.

Level of international advanced technique: In machining center and respect of main shaft of report of numerical control milling machine, the grease on international is lubricant model machining center uses electric main shaft top rotate speed is 60000r/min, oil gas is lubricant model numerical control mill is highest rotate speed is 140000r/min, and the power of high-power report main shaft can amount to 80kW, rotate speed is 10000r/min, its are the biggest torsion can amount to 380Nm. Grinding respect of the main shaft that use phone, the bearing Dmn value of product of international main shaft is as high as 2.4 million Mmr/min, choose oil gas lubricant means, output power is global than going up generation product increases 50% the left and right sides, its work life also grows 50% generally to control.

Machine tool of national numerical control weighs target of old special technique: Rated power and top rotate speed are ① 50kW, 20000r/min (it is 30kW, 30000r/min and 10kW, 40000r/min twice additionally) . ② has bearing trends to be tightened beforehand adjust a function. 5000h of time of ③ average failure free operation. 1.0m of < of precision of circumgyrate of ④ main shaft. 300Nm of stiffness of ⑤ shafting all. Class of G0.4 of precision of ⑥ dynamic balancing. ⑦ constant power 14. Limits of wave motion of ⑧ rotate speed 0.04% the following. Buy of ⑨ C position of axle controls precision 10. Interface of coder of ⑩ high resolution can support 17 coder most (131072 pulse / R) . 11. Have interface of bus line of two kinds of spots.

2. Liquid (move) static control territory of bearing report main shaft

Home has a level: The liquid that Shanghai achieves limited company of main shaft of accurate machine tool to develop formerly (move) the static main shaft that suppress report, rated power and top rotate speed achieve 34kW, 8500r/min, radial and jumpy 1m. The liquid that firm of Oriental seed profit produces (move) the static main shaft that suppress report, rated power / top rotate speed achieves 17kW, 8000r/min, radial and jumpy 1m, radial stiffness 500Nm. Hunan university is aimed at the circle outside exceeding high speed / camshaft grinder developed liquid of type of the buy inside electromotor (move) the static main shaft that suppress report, rated power and 35kW of highest turn up, 10000r/min, radial circle is jumpy 1m; Still be aimed at grinder of the circle inside high speed at the same time, developed activity of liquid of type of the outfit inside electromotor of 12kW, 30000r/min to press electric main shaft. The limited company of Beijing northing nicety of subordinate of Beijing aerospace university developed set (move) static control main shaft product, rated power and top rotate speed achieve 7.5kW, 48000r/min, circumgyrate precision can achieve 0.5m less than. Inside the circle is ground (move) static control main shaft aspect, home already produced turn up 20000r/min, the main shaft product of 28mm of main shaft diameter. At present domestic liquid (move) static the circumgyrate precision that presses main shaft is the most high-energy achieve 0.1m.

International is advanced level: German HYPOSTATIK company develops outside the round main shaft that obliterate report, top job rotate speed is 7600r/min, power is 50kW, 320Nm of emery wheel radial stiffness; Cam grinds main shaft of concave side grinding, rotate speed 25000/35000r/min, emery wheel radial stiffness is 120/60Nm; Milling is static the main shaft that suppress report, top job rotate speed is 42000r/min, power is 15kW, bearing stiffness is 200/160Nm.

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