CNC machine tool is frequent the meeting that change a knife is influential to main shaft precision, what is main shaft float makes knife structure?

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  • source:BERO CNC Machining
What knife oil cylinder hits to will affect main shaft bearing to the active force of main shaft in knife process is change to use a case in main shaft, and this active force is far the cutting force that is more than main shaft, can cause damage to bearing, in affecting bearing service life to be machined in high speed, the rotate speed coming back of main shaft is spent taller, especially the rotate speed of electric main shaft can be amounted to commonly 20000 turn / second, accordingly its bearing more sex of apt high speed, and in bear load ability respect is relatively insufficient. The broach of broach lever; that the oil cylinder that hit a knife pushs main shaft interior forth below circumstance of hydraulic pressure oily infuse has dish form bedspring to exist between lever and main shaft, extend forth when broach lever, below circumstance of main shaft immobile, dish form bedspring is compressed, force of this bedspring of; of generation bedspring force will make winner axis has the tendency that moves forth, but main shaft is secured by main shaft bearing do not move, final action reachs this bedspring power on main shaft bearing. Because this changes a knife in main shaft,knife oil cylinder is hit to will affect the use situation of main shaft bearing to the active force of main shaft in the process, and this active force is far the cutting force that is more than main shaft, can cause damage to bearing, affect bearing service life. In working process, when hydraulic pressure oil enters the 2nd seal chamber via presenting oily opening, piston and lid of end of oil cylinder body all get the active force of oil pressure, at the same time the piston moves ahead and drive broach lever to move forth, achieve the loose status that plays claw thereby. Meanwhile, main shaft also gets a forward thrust; and while the piston moves ahead, oil cylinder body carries a lid to be able to move backward, drive oil cylinder body and main shaft locking mechanical system to slide backward together, be opposite till main shaft of locking of main shaft locking mechanical system main shaft inflict is backward tensile, this backward pulling force that main shaft place gets and the forward thrust direction that its get are contrary, and pass beforehand design, can make afore-mentioned pulling force and thrust big Xiaoxiang close, because this can achieve effect,the active force with these two opposite way on main shaft offsets almost. The main shaft that serves as rigid spare parts so will be nonexistent the trend that moves downward, the main shaft bearing that is used accordingly at securing main shaft also won't get the influence of this active force, play knife function in implementation float thereby while, the circumstance getting power of bearing of ameliorable main shaft, improve its service life. As contrary as afore-mentioned processes, through answering oily mouth to the oiling inside the first seal chamber when, the active force of oil pressure will make the piston moves backward and make oil cylinder body forward move and restoration, the displacement of the forward movement that blocks annulus to be used at limitting oil cylinder system, because oil cylinder body is forward,avoid to move excessive and attaint broach lever. Brief summary: Because this used the CNC machine tool that float makes knife jar, the knife is changed in main shaft the knife is hit to use float to hit knife orgnaization in the process, the action that because change,can offset the knife arises effectively the axial force at main shaft, avoid to cause damage to bearing, assured service life of main shaft bearing, the life that promoted main shaft thereby and use precision, good main shaft precision is attached most importance to especially in treatment of high speed cutting should, will for a long time look, the maintenance that reduced machine tool of CNC numerical control cost. CNC Milling CNC Machining