Study the accuracy of gear and helical gear mechanism based on relevant theoretical analysis
A carbon Steel Plate has usually been considered as the steel that does not contain much alloy steel elements, also named as mild steel. Generally, elements are C, Mn, P, S, Si, besides these, there are no minimum limits for elements of Al, Cr, Ni, Mo, V, etc.
Low carbon steel is the most common form, and it's very malleable and ductile. Medium carbon steel balances ductility as well as strength for excellent wear resistance. High carbon steel is exceptionally strong, while ultra-high carbon steel can be tempered to even greater hardness but no malleability.
As the percentage of carbon gets larger, steel can become harder and stronger through heat-treating. Carbon steel is usually heated to change the mechanical properties of steel, usually ductility, hardness, strength, and resistance of impact. Increasing the carbon content of carbon steel makes it harder and stronger, but reduces the steel`s ability to be welded, making it more brittle.
Carbon steel plate is most often used for structural purposes such as buildings, yet it has the flexibility to be worked into ornate designs. Low carbon steel sheet (wrought iron) is typically used for fences, chain links, gates, and railings. Structural steel (medium carbon steel) is used in cars, refrigerators, washing machines, buildings, and bridges. The steel sheets are normally made up of medium carbon steel.
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There are many factors affecting the transmission accuracy, but it is mainly manifested in the inherent error caused by the production and processing or design of the gear itself, the error caused by the manufacture and processing of other components in the device and the cooperation with the gear, and the nature of the material itself (including material strength, hardness and Gear meshing rigidity, etc.), the error introduced by the external condition changes such as temperature due to the influence of temperature, such as grinding teeth, elastic deformation or runout, wherein the gear pair's own error factors mainly include: gear tangential comprehensive error, rolling bearing inner and outer ring diameter Jumping, gear matching clearance, pitch accumulation error, gear radial runout, common normal length variation, shaft runout, etc.
According to relevant theoretical analysis and experimental research, we can improve the transmission accuracy of the system from the following aspects: (1) Reduce the error source. The more sources of error, the greater the cumulative effect on the axis of rotation. The shaft drive scheme, the coupling type, the flank clearance, the connection with the shaft, the toothed fit, etc., the wear-resistant tube will have an influence on the accuracy. Reduce the source of error as much as possible, if possible.
(2) Improve the machining accuracy and installation accuracy of the entire transmission chain or some key components. The final gear transmission gear has the greatest influence on the deflection angle of the rotating shaft (the accuracy of the gear pair of some high-speed transmission mechanisms close to the input shaft has a great influence on the transmission error), and the error of the final stage and its adjacent gears and connectors is controlled. You can get effective control. The accuracy of the transmission output shaft and the load shaft and its coupling itself is also very important, improve the processing and installation accuracy, and analyze the factors affecting the reasonable gear transmission accuracy and experimental research.
Generally, the cylindrical spur gear and the helical gear mechanism have higher precision, the worm and the worm wheel are the second, and the bevel gear is relatively low. Among the planetary gear transmission mechanisms, the harmonic gear has the highest precision, and the involute and the small-tooth difference planetary gear mechanism is the second. The needle pin planetary mechanism is second. In the design process, you can optimize the matching drive combination according to your needs, choose 2K-H type, 3K type or KHV type, and 2K-V type RV transmission mechanism and KH type three-ring transmission mechanism which are evolved from these three basic forms. Internal translation gear transmission mechanism, etc. A new and more reasonable combination of transmission structures is used to meet transmission accuracy and other requirements. The transmission transmission ratio has a great influence on the accuracy. If the total transmission ratio is certain during design, reducing the number of transmission chain stages can reduce the transmission error, design the transmission ratio as reasonable as possible, and meet the requirements of accuracy, external dimensions, processability and economy. In the planetary transmission, the wheel train hysteresis is inversely proportional to the diameter of the sun gear indexing circle, and the dimension d can be avoided as much as possible during the design process. In addition, the water-cooled screw unit drive chain needs reasonable arrangement. Generally, in the reduction drive, the low-precision transmission mechanism (cone gear, worm gear mechanism, etc.) should be placed on the high-speed shaft, which can reduce the error of the low-speed shaft.
The anti-backlash mechanism and error compensation are used to reduce or eliminate the free motion. Common anti-backlash mechanism: adjustable center-to-center clearance, spring-loaded double-piece gear backlash, spiral drive anti-backlash mechanism, etc., can be contact spring, reasonable distribution, neural network error compensation and other methods.