Robot bearings are basically thin-type high-precision bearings. The accuracy of this type of bearings is above P5, and some of the bearings meet the requirements of P2. They are ultra-high-precision bearings.
It mainly includes two major categories: one is a thin-walled bearing of the same cross section, and the other is a cross cylindrical roller bearing. There are also harmonic reducer bearings, linear bearings, joint bearings, but mainly the first two types of bearings.
So, how does the robot bearing achieve high accuracy?
(1) Precise control of negative clearance of thin-walled bearings. Industrial Robot bearings are required to run smoothly and have a proper starting friction torque. Therefore, a proper amount of negative clearance is required during bearing production and assembly. If the negative clearance of the bearing is too large or too small, it will directly affect the noise, vibration and life of the bearing. The thickness of the inner and outer rings of the thin-walled bearings used by dry robots is thin. When the clearance is measured by the loading method, it is easy to cause the ring to deform. The amount of negative clearance is difficult to control, requiring special processing and assembly methods and processes, and using special assembly tools.
(2) Precise control of assembly height of thin-wall angular contact ball bearings. The robot has a compact structure and accurate installation space, which requires strict assembly of the bearings.
(3) Precise assembly of thin-walled bearings. Due to the ultra-thin wall thickness and poor rigidity of robot-specific precision bearings, ordinary assembly methods and molds are used to deform easily when heating the mating sleeve. Therefore, in order to achieve the precise assembly of thin-walled bearings and achieve the various indicators of the finished product, it is necessary to select and match the assembly dimensions of the thin-walled bearings, formulate the assembly process and adopt special assembly molds and accessories, and repair the selected bearing rings.Develop detailed and strict assembly technology, and develop special assembly tools and accessories to ensure the accuracy of bearing assembly.
(4) The wall thickness of the thin-walled bearing ring is very thin. Precision turning and grinding are required to achieve the required tolerances. At the same time, the measurement accuracy of the contour parameters of the thin-walled bearing ring is extremely high.Therefore, it is necessary to study the measurement method of the inside and outside diameter of thin-walled bearing sleeves. Based on the non-contact optical precision measurement technology, a set of thin-walled bearings is developed by integrating related technologies such as motion computer vision, image processing, precision motion control and computer control Dedicated measuring instrument for outer contour.
（5）In order to evaluate the performance, life and reliability of the robot bearing, simulation experiments must be tested before installation to ensure that the bearing performance is stable and reliable.