XP CATALOG

COMPLEX ball screws have been designed for applications with requirements of accurate positioning, high speeds and high loads, such as high speed, 5 axis machining centres, large sized machining centres and combined machine tools, die mold processing machines, aeronautics and automotive work pieces and other applications with highly demanding conditions. The great achievement of the COMPLEX technology is to considerably increase the axial rigidity of the ball screw without harming the movement softness and without increasing the preload torque, hence, without generating a temperature increase. This is what we call Efficient Rigidity, the optimum relationship between rigidity and torque, thus getting the highest possible rigidity with the lowest preload/temperature. By plotting ball screw rigidity and torque on a chart, the area can be divided into different zones as a function of ball screw feature level. When comparing two identical ball screws, red lines A (COMPLEX ball screw) and B (non COMPLEX ball screw), of the same specifications (d0, Ph, Dw, i) , under the same conditions (rotation speed, alignment, ambient temperature, lubrication, wipers, etc.), both with the same preload level (%Ca) (blue line), results show that a COMPLEX ball screw has a higher rigidity at the same torque level, or the required torque level is lower for obtaining an identical rigidity, thus improving performance and the life level of the COMPLEX ball screw. For two identical ball screws, SHUTON·IPIRANGA suggests using the ball screw ‘Quality Grade Q ’ to determine the best solution. The relationship between preload torque and rigidity is: Ball screw quality grade Q : A better ball screw provides a higher rigidity under the same torque; the Q value is therefore lower. A lower Q value indicates a better ball screw. This is a fast and effective means of comparing two identical ball screws: Q Better ball screw T pr P h = ( R real ) Q ln ( 1000 3 ) T pr P h Q = ln R real R nu,min T pr,min T pr T pr,max R nu,min T pr,min T pr T pr,max R nu,max R nu,max RIGIDITY R real [N/μm] TORQUE Tpr [Nm] TEMPERATURE Average features COMPLEX Ball screw TECHNOLOGY RIGIDITY R real [N/μm] T pr,B =R real,B ^B T pr,A =R real,A ^A TORQUE Tpr [Nm] TEMPERATURE High preload Low preload Average features COMPLEX Ball screw Limited features B  T pr A  R 12