The rise in pre-compression temperature affects Ball spline The axis has three effects! Let’s take a look below!

    (1) Rigidity the impact of

　　To prevent any loss of synchronization in mechanical transmission systems, it is crucial to enhance the stiffness of the nut. However, temperature rise significantly affects the ball spline shafts used in thermometers and encapsulating equipment! To improve the nut’s rigidity, the nut’s preload must reach a certain level. Applying preload to the nut increases the friction torque in the threads, thereby raising the operating temperature. Recommendations: For medium-to-heavy preloads, use 8% of the dynamic load; for intermediate preloads, use 6% to 8%; for light preloads, use 4% to 6%; and for very light loads, the preload should be less than 4%. The maximum preload should not exceed 10% of the dynamic load, in order to achieve optimal service life and minimize temperature rise.

　　(2) The effect of lubrication:

　　The choice of lubricant directly affects the temperature rise of the ball spline shaft. The ball spline shaft in the encapsulation equipment is lubricated with either oil or grease. Generally, bearing lubricating oil is recommended for lubricating ball spline shafts, while lithium-based grease is recommended as the grease lubricant. The selection of oil viscosity has three significant effects on the ball spline shaft in the human thermometer encapsulation equipment, depending on the operating speed, working temperature, and load!

　　When operating under high-speed, low-load conditions, it is advisable to select a low-viscosity oil. At low speeds and under negative temperature rises, the ball spline shaft in human-body thermometer encapsulation equipment is affected in three ways! During loading, it is recommended to use a high-viscosity oil. In general, for high-speed applications at 40℃ (DIN 51519), lubricants with a viscosity index ranging from 32 to 68 cSt (ISO VG 32 to 68) are recommended; for low-speed applications, lubricants with a viscosity index of 90 cSt (ISO VG 90) or higher at 40℃ are recommended. When used in high-speed, heavy-load applications, forced cooling must be employed to reduce the temperature—this can be achieved by introducing cooling oil into the hollow screw.

　　(3) The effect of prestress:

　　The temperature rise of the ball spline shaft has three significant effects on the ball spline shaft used in the encapsulation equipment for human body thermometers! As the temperature increases, thermal stress causes the screw to elongate, leading to instability in its length. The degree of elongation can be calculated using the M40 formula and can be compensated for through pre-stretching. The target value for pre-tension compensation can be determined by selecting specific parameters. Excessive pre-tension can damage the support bearings; therefore, it is recommended to use a pre-tension value below 5°C. However, if the screw diameter exceeds 50 mm, pre-tensioning becomes unsuitable. A large screw diameter requires substantial pre-tension, which can cause the support bearings to overheat and burn out. It is recommended to take a temperature rise of around 3°C as the reference value for compensation T (approximately -0.02 to -0.03 mm per 1000 mm of screw length).