Accuracy of industrial robots to the bearing design

Industrial robot is a new type of alternative to local artificial intelligent machine equipment stop high-tech industrial consumption. As the robot industry consumption, nothing more than to use three words to describe its request: quick, accurate and stable. On consumer technology, today's robots are more easy, fast and exact and if at the time of fast and steady must be accurate, it is relatively difficult to compare. Here is defined a word: repeated positioning accuracy of industrial robots - — Industrial robots do an action ( Ordinary 10 - - 20 times) Every time, and plan the location of the bias of the mean is it repeated positioning accuracy, general need laser interference measurement. About industrial robots, precision are important factors, which directly affects the quality of the product and consumption efficiency. And the main factors of 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 a short-lived life, high rigidity, low friction using request, so in the design of industrial robots is not as long as thinking about as large as possible dynamic load rating, also select best value of each structure parameters of demand, to improve the bearing parts contact stress distribution, reach to smooth the oil film constitute the best contact state, bearing the use life of progress. 2, ring channel location contact ball bearing inner and outer ring of the industrial robot adopts integral structure, and general cross-sectional area as long as the same diameter specifications bearing 20%, so it formed the insist on plane 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, adhere to the frame at the bottom of the pocket hole strength and sealing ring device location will be limited. Therefore, in order to ensure the bearing frame has sufficient strength and sealing device has enough space, groove position to take on both sides of the end face of asymmetry of the design. 3, guard height is contact ball bearing in the work state of the industrial robot, in to accept certain radial load, but also accept certain axial load. Acceptance of the axial load is too large, steel ball can be formed with inner and outer rim edge contact or between rim and raceway contact ellipse is truncated, this time will generate stress concentration, bearing ring will wear, thus affecting precision. Guard high design, therefore, required according to the bearing axial load size bearing ring application of the theory of Hertz contact stress calculated minimum height of penal J, to calculate the ring rim diameter. And thinking to contact ball bearing in the design of sectional area is lesser, under the premise that satisfy the using request, high guard coefficient value can be smaller than deep groove ball bearings. 4, sealing structure design of industrial robots is bearing the early destroy normal because of bad sealing because of bad sealing debris or other contaminants in the air is easy to enter the bearing, so that smooth and gradual failure, cause damage of bearing. So the bearing seal is the key. Sealed bearing, thus design should not only think to seal, and detailed work request to consider to the bearing and the bearing structure in detail. Industrial robots are carried out toward miniaturization, lightweight and intensification. So smooth had better use of industrial robots with bearing with seal structure of smooth smooth way to stop fat. 5, according to the characteristics of industrial robot bearing thin wall bearing inner ring with the way the sealing lip there are two common: 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 seal associated with non-contact seal dust leak grease effect is better, but the friction torque is larger, the temperature is higher, thinking to the friction torque is bigger, have adverse effects on the robot host, common use 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 strict control seal clearance.