The development trend of synchronous belt wheel is analysed
1. The synchronous belt wheel manufacturing process
Synchronous belt wheel manufacturing technology greatly to the development of the above-mentioned precision grade and the production efficiency. Now since the seventy s the manufacturing precision of all kinds of synchronous belt wheel, general improvement level or so. Some even 2 ~ 3 grade. Generally low speed synchronous belt wheel precision from the past 8 ~ 9 to 7 ~ 8. Synchronous belt wheel machine by 6 ~ 8 level up to level 4 ~ 6. Mill synchronous belt wheel by 7 ~ 8 level up to level 5 ~ 6. On the small and medium-sized specifications with low modulus of synchronous belt wheel, due to the development of high performance gear hobbing machine, with the improvement of the cutting tool material, gear hobbing efficiency have improved significantly. The bull gear hob, under the condition of big feed and, can achieve the cutting speed of 90 m/s. If use superhard hob processing module 3 quenched and tempered steel synchronous belt wheel, cutting excessive can reach 200 m/s. Improve the efficiency of gear shaper, gear shaper cutter reciprocating motion structure to limit. Recently in the development of the uninstall tool, using the static pressure bearing, enhance the tool post and the new structure, such as pillar rigid efficiency significantly. New type of gear shaper of stroke number can reach 2000 times/min.
2. Synchronous belt wheel steel
Synchronous belt wheel (imported polyurethane synchronous belt) with the development trend of steel; It is containing Cr, Ni, Mo, low alloy steel; Second, the boron steel; Three is the carbonitriding steel; Fourth, free cutting steel. Because our country lack of Ni, Cr, commonly used 20 crmnti carburizing steel or of rare earth with boron steel. 18 crmnnimo heavy machinery used in carburizing steel or carbon steel. Machine tool industry consumption of 40 cr, 38 crmoal, such as steel and high speed synchronous belt wheel with 25 cr2mov steel nitriding.
3. The trend of informatization
People can use computer to the variety of possible design calculation, analysis and comparison, and through optimizing, obtain ideal results. On the analysis of the tooth surface contact area, for example, strives for the line of action and the relative velocity Angle, the elastohydrodynamic lubrication and geometric parameter calculation program is compiled. Also, the synchronous belt wheel modification calculation and synchronous belt wheel bearing capacity computing program have. China has compiled the GB3480-83 involute cylindrical synchronous belt wheel bearing capacity calculation standard application software, for production application. In terms of synchronous belt wheel processing, can use computer to control the gear cutting process. The manufacturing quality is stable and reliable. At present, the domestic application of microcomputer in research of arc tooth taper synchronous belt wheel teeth calculated, adjust the card can adjust processing deviation in time. Make the tooth contact achieve ideal position, and greatly improves the working efficiency.
In addition, according to the principle of numerical control, the application of microcomputer to parabolic torus worm helical gear tooth surface modification, has been used in production. Although this work at home is still in its infancy, but it does improve the synchronous belt wheel manufacturing quality and technical level is of great significance.
Internationally, synchronous belt wheel device is developing along the direction of miniaturization, high speed and standardized. Especially the application of synchronous belt wheel, a planet of synchronous belt wheel synchronous belt device development, low vibration, low noise, synchronous belt wheel device was developed some characteristics of the synchronous belt wheel design. To achieve synchronous belt wheel device miniaturization, can improve the existing bearing thrust of the involute synchronous belt wheel. Widely USES the hard tooth face technology, increase the size of the hardness to shrink device; Also can be used by arc synchronous belt wheel special tooth profile. Anglo-french cooperation development of ship-borne helicopter main transmission system adopts arc synchronous belt wheel, thus greatly reduced reducer height. As Marine power by medium speed diesel engine instead of trend, on the big ship adopts high-power synchronous belt wheel gear planet do work; Now metallurgy, mining, cement mill and other large transmission device, the planetary synchronous belt wheel with its small size, good coaxial, the advantages of high efficiency and applied more and more.
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