The machine tool is usually listed in the lead screw table 1. For the screw not listed in the table, it can be calculated by interpolation. The formula shows that C is proportional to the ratio, and according to experience, C is proportional to the ratio.
It is the relationship between C and d0, P and i. It can be seen from the figure that if the pitch is not selected according to the machine tool accuracy condition, then selecting p and d0 to increase the dynamic load and life can be improved. From the above analysis, it is known that the life of the ball screw increases with the increase of i, d1, d0, P and the reduction of the thread and nut threading machining error.
Under varying operating conditions (variable speed and load), when selecting a ball screw pair, we usually know the equivalent axial load (or average load) Fm, the equivalent speed (or average speed) Nm, the expected working life Lh unit For hour (h), the middle is the axial load, and the screw speed is the percentage of working time.
For the general machine tool and the combined machine tool Lh, the dynamic load C actually needed by our door can be obtained by taking 10000h, and the corresponding screw parameter d0, P, i combination is selected according to the C value to the screw sample. In the formula, the maximum speed of the moving parts is the maximum speed of the screw.
When we choose to accept and limit, the general choice is not large, the choice of i is limited by the threading error, the cumulative error of the pitch of the lead screw and the nut and the cycle error and the taper of the nut thread, or the number of effective working cycles cannot be Infinitely increasing, the author suggests to choose the maximum value of i and the combination of d0 and P. The reference dynamic load C0 is greater than the calculated dynamic load C. The author suggests that d0 should be selected according to the above principles. Increasing a specification will be better at a price/performance ratio unless limited by structure.
(Finish)
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