In the process of precision parts processing, in order […]
In the process of precision parts processing, in order to improve the motion performance of the air bearing guide, the following three methods can be used in the process of precision parts processing.
1. Improve the rigidity of the guide rail in the load-bearing direction: a closed guide rail is used in the design of the guide rail structure, which can increase the rigidity by 2 times compared with a single side; reduce the air float gap. And increase the force to close, the air source needs to be stabilized and clean to reduce the possible oscillation factors; in the air supply circuit, it is necessary to design a load compensation mechanism and an automatic pressure regulating device. Little change. , Or rationally arrange the air cushion to make its automatic balance adjustment. For high-precision measuring machines, the accuracy of the air floatation (that is, the fluctuation value, ん. The change value) should be within 0.001-0.002mm.
2. Improve the damping force during the movement of the guide rail: the more holes of the air cushion, the greater the damping force and the greater the rigidity. If the powder metallurgical porous material is used as the air cushion, a large area of micropores will replace the small hole throttle air cushion, and the damping force Will be bigger. When precision parts are allowed to be processed, gas-liquid two-phase lubrication can be used. The damping force is increased due to the presence of an oil film on the contact surface of the guide rail.
3. The structure of semi-air-floating rails is adopted: the coordinate machine is a combination of air-floating rails and mechanical rails, which utilizes the advantages of the motion characteristics of the two types of rails, which not only improves the resistance to end-motion, but also maintains the air-floating rails. Gap ん. Constant, and increase the damping force of the guide rail movement, thereby improving the movement performance of the guide rail.