With the development and application for the ultra-precision machinery industries and smart machinery have become prosperous. The precision transmission sub-system is an important part of the precision machinery equipment and smart machinery industries. Then shrapnel-type coupling is an important part of the precision transmission system. In the shrapnel-type couplings with high precision, high reliability, and high efficiency. The design of shrapnel-type couplings needs to correct and improved in the manufacturing with very high-precision inspection equipment, and expert measurement technology. The high quality of shrapnel-type couplings, materials and manufacturing qualities are the main factor for high precision, high reliability, and high efficiency. This paper will be a depth study of the body materials and manufacturing qualities of shrapnel-type couplings. The inner hole contact surfaces of the shrapnel-type couplings to connect between each other connecter tested the properties of the coupling via toque-torque angle testing equipment with changing the shrapnel-type couplings body materials and manufacturing different roughness of inner hole. The key characteristics that affect the torsional rigidity and failure torque of the coupling grasped are found out using the self-developed toque-twist angle testing machine. The body of the shrapnel-type couplings made with 7075 aluminium alloy and 6061 aluminium alloy. Through experiments, we can understand the influence of different materials bodies on the torsional rigidity and failure moment of the shrapnel-type couplings. From experimental results, that 7075 aluminium alloy is better than 6061 aluminium alloy of torsional rigidity or failure moment. As the inner hole surface roughness of the shrapnel-type couplings smaller has a higher failure torque of coupling.
Grinding robot is used in building construction to replace manual grinding of concrete components. Bearing in grinding system under high-speed conditions has friction violently with the inner and outer ring, and generates a lot of heat. This will cause thermal failure of grinding system. In order to explore the thermal characteristics of rolling bearings, a numerical analysis model based on bearing heat transfer mechanism was established to study the influence of different working conditions on bearing temperature. The results provide a reference for reducing the thermal failure of rolling bearings in grinding system of grinding robot.
Precision assembly fastening is an indispensable part of technology. The clamping force of the precision fastening system maybe remain Table or decrease when the assembly is subjected to axial vibration. In the meantime, rotating for a long time at a very high speed will produce a very high temperature. When the temperature rises, it will greatly reduce the overall performance and accuracy of the precision fasten system. With the background of this problem, this research was started. In this study, experiments were carried out with a rotation dynamic percussion testing machine, and the Taguchi method was used to discuss the assembly of the precision fasten system with different parameters and conditions. The experimental control factors are the fitting clearance, bearing contact angles, and the viscosity of the lubricating oil. After getting the test value, the next step is a statistical analysis using the Taguchi method in stages to get the final optimal results of the experiment. The results showed that the bearing contact angle and the viscosity of the lubricating oil are important factors affecting the temperature rise of the bearing. The results of this experiment can be applied as a basis for assembling machine tools for the advanced manufacturing industry, aircraft industry, automotive light vehicles to heavy vehicles in the mining world, etc. This also aims to improve the accuracy and stability of the precision fastening system.
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