The relationship between accuracy of industrial robots and bearing design knowledge of bearing

Can replace part of the industrial robot is a new type of artificial intelligent machines for industrial production of high-tech equipment. As industrial robots, but can use three words to describe its requirements: quick, accurate and stable. For now robot production technology, are more easy, fast and exact and if to do it fast, at the same time also to do, it is relatively difficult. Here is defined a word: repeat positioning accuracy of industrial robots - — Industrial robot repeat an action ( General 10 - - - - - - - 20 times) Every time, and plan the location of the deviation of the mean is it repeat positioning accuracy, generally need to use laser interferometer to measure. For industrial robots, precision are important factors, which directly affects the quality of the products and production efficiency. And the main factors affecting the precision of the industrial robot is bearing, so what kind of bearings can make industrial robots will have higher accuracy? 1, key structure parameters design of industrial robots bearing has long life, the demand of high rigidity, low friction, so in the design of industrial robots should not only consider the dynamic load rating of as large as possible, you also need to select best value, of each structure parameter of the contact stress distribution in order to improve the bearing parts, achieve best contact state favour lubricating oil film formation, improve the service life of bearing. 2, ring channel location contact ball bearing inner and outer ring of the industrial robot adopts integral structure, and general cross-sectional area is only 20% bearing the same diameter, so it caused the cage of the radial wall thickness value is limited, if the channel position design in the center of the bearing width, so that the bearing is a symmetrical structure, and at the same time at the bottom of the cage pocket hole strength and seal ring installation location will be limited. Therefore, in order to ensure the bearing cage has the enough strength and sealing ring have enough installation space, groove position to take on both sides of the end face of asymmetry of the design. 3, the determination of guard highly contact ball bearing in the work state of the industrial robot, under a certain radial load, but also absorb a certain amount of axial load. If under axial load is too big, can cause steel ball and the inner and outer rim edge contact or between rim and raceway contact ellipse is truncated, this time will generate stress concentration, bearing ring is worn, thus affecting precision. Guard high design, therefore, should be based on the bearing axial load size of bearing ring using the theory of Hertz contact stress calculated minimum height of penal J, so as to calculate the ring rim diameter. While considering the contact ball bearing in the design of sectional area is lesser, under the premise that meets the requirement, high guard coefficient values can be smaller than deep groove ball bearings. 4, sealing structure design bearing of the early damage of the industrial robot in general because sealing is not good, because of the bad sealing debris or other contaminants in the air is easy to enter the bearing, so that the grease failure gradually, result in bearing damage. So the bearing seal is the key. Sealed bearing, so the design should not only consider the seal, specific job requirements and at the same time take into account the bearing bearing forms of concrete structure. Industrial robots are developing toward miniaturization, lightweight and motors. Therefore industrial robot is used for sealing structure with best bearing lubrication grease lubrication way. 5, according to the characteristics of the industrial robot bearing thin wall bearing inner ring with the way the sealing lip is generally has two kinds: the inner ring sealing lip contact with inner ring rim contact sealing inner ring seal lip contact with inner ring guard non-contact sealing contact sealing relative to non-contact seal dustproof leak grease effect is better, but its large friction torque, high temperature, considering the friction torque is bigger, have adverse effects on the robot host, generally USES non-contact seal structure in design. In addition because of bearing ring wall is thin, bearing inner and outer ring is easy deformation, the inner ring guard can be used without slot structure, but to strictly control the seal clearance.