Mnoge opreme moraju biti precizne, tako da su vrijedne. Međutim, kada je kuglični vijak u funkciji, visoka temperatura će uticati na tačnost opreme, posebno nekih visoko{0}}preciznih mašina. A koji faktori će povećati temperaturu kugličnog vijka?
The elements of temperature rise are basically these three types: 1. Pre-pressure 2. Smooth 3. Pre-tensioning
1. The influence of pre-pressure
In order to prevent any loss of step of the mechanical transmission system, it is important to improve the rigidity of the nut. However, to improve the rigidity of the nut, it is necessary to make the preload of the nut reach a certain level. Applying pre-pressure to the nut will increase the conflicting torque of the screw and increase the temperature rise during operation.
HIWIN zagovara da srednje i teško predopterećenje iznosi 8 posto dinamičkog opterećenja; srednje predopterećenje je 6 do 8 posto; srednje i lagano predopterećenje je 4 do 6 posto; lagano predopterećenje je ispod 4 procenta, a najveće predopterećenje ne bi trebalo da pređe 10 procenata. Dinamičko opterećenje za postizanje najboljeg životnog veka i nižeg efekta porasta temperature.
2. The effect of smoothness
The selection of smooth oil directly affects the temperature rise of the ball screw. HIWIN ball screw must be smoothed with oil or grease. Generally, it is recommended to use bearing lubricating oil as ball screw lubricating oil, and for grease, it is recommended to use lithium soap-based grease. The choice of oil viscosity is based on operating speed, operating temperature and load conditions.
It is best to choose low-viscosity oil when the working condition is high speed and low load; when low speed and high load, it is recommended to use high viscosity oil. Generally speaking, it is recommended to use the viscosity index scale of 32-68 cSt (ISO VG 32-68) (DIN 51519) kada je ulje za podmazivanje 40stepen; Kompenzacija se vrši pre-povlačenjem; a ciljna vrijednost kompenzacije prije povlačenja je negativna T vrijednost naznačena na crtežu. Prekomjerno zatezanje će izgorjeti potporni ležaj, pa HIWIN zagovara korištenje vrijednosti zatezanja manja od 5stepen, ali nije pogodan za predzatezanje ako promjer vijka prelazi 50 mm; veliki prečnik zavrtnja zahteva veliku silu zatezanja, što dovodi do oslonca. Ležaj je pregrejan i izgoreo.
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