1. Gear Grinding: Gear grinding is the most effective and reliable method for obtaining high-precision gears. Developed countries use hardened gear surfaces, making gear grinding the primary machining method for high-precision gears. Currently, disc grinding wheels and large flat grinding wheels can achieve gear grinding accuracy up to DIN2 level, but the efficiency is very low. Worm grinding wheels achieve gear grinding accuracy up to DIN3-4 level, with high efficiency, suitable for grinding medium and small module gears, but grinding wheel dressing is relatively complex. The main problems with gear grinding are low efficiency and high cost, especially for large-sized gears. Therefore, improving gear grinding efficiency and reducing costs are the main research directions at present. New technologies in gear grinding in recent years include: (a) double-sided grinding method; (b) high-efficiency gear grinding with cubic boron nitride grinding wheels; (c) continuous forming gear grinding technology and ultra-high-speed grinding technology. 2. Gear Milling: Gear milling is a forming method for machining gears. The cutter's profile is the same as the tooth groove shape of the gear being machined. The cutter feeds along the tooth groove direction of the gear. After one tooth groove is milled, the gear being machined is divided into…

Cast sprockets are mainly used in the machining of large sprockets. During machining, only the tooth ring, the two end faces of the flange, the outer and inner diameters, and the keyway are machined, and then the tooth profile is machined. Ring sprockets are all cast. There are generally two materials for cast sprockets: cast iron and cast steel, such as HT15O, HT200, and ZG310-570 (ZG45). Welded structures are mainly used in the machining of medium and large-sized single and double-flange sprockets. During machining, the flange part is machined from bar stock into a convex shape. The tooth ring part can be made by cutting sheet metal, machining the outer diameter and shaft hole, and machining a welding bevel at one end of the hole to fit into the flange part for welding. Welding is done at both ends using low-hydrogen welding rods such as T506 welding rods. Forged sprockets are mainly used in the production of medium and large-sized sprockets subjected to greater forces. During forging, whether single-flange or double-flange, they are generally forged into a convex shape, leaving sufficient machining allowance in the shaft hole. This results in lower material utilization and higher costs. Sprocket machining…

Typically, sprockets have 24 teeth evenly distributed, with an angle of 15° between any two teeth. The end point of one tooth profile is the starting point of the next. In actual machining, rotating the coordinate system by a certain angle after milling each tooth before continuing milling reduces the workload of programming. To simplify the sprocket machining program, the relative coordinate instruction G91 is used to rotate the coordinate system, eliminating the need to write subroutines for each tooth. Programming is based on machining one tooth profile, with the end point of the machining program for that profile serving as the starting point for the next, and so on. Based on their application, sprockets can be divided into driving sprockets and driven sprockets. Driving sprockets are connected to the engine output shaft via splines and secured with spline baffles or nuts. Disassembly involves removing the sprocket cover and chain, then unscrewing the spline baffle or fixing nut to pull out the small sprocket. Assembly is performed in the reverse order. Driven sprockets…

Sprocket materials generally need to meet three requirements: 1) strength; 2) wear resistance; 3) impact resistance (under impact loads). Specifically, there are ordinary carbon steel, high-quality carbon steel, and alloy steel. For larger sprockets (when requirements are lower), refined cast iron can be used, and for low-power transmissions, fabric-reinforced phenolic resin can be used. Note: 1) Under impact loads, low-carbon steel and low-carbon alloy steel are generally used → carburizing, quenching, and tempering. 2) For sprockets without severe impacts and with medium to high speeds, medium-carbon steel and medium-carbon alloy steel are generally used → quenching and tempering. 3) For sprockets with a large number of teeth (extra-large) Z>50 → gray cast iron is used. 4) For medium to low-power transmissions → ordinary or high-quality carbon steel is used. For high and low-power transmissions → alloy steel is used. 5) For P<6KW, high-speed chain drives → fabric-reinforced phenolic resin is used, resulting in lower noise and smoother transmission. 6) The material and heat treatment requirements for small sprockets should be higher than those for large sprockets—because the number of meshing cycles for small sprockets is higher than for large sprockets…

Selection principles for sprocket materials: Sprocket materials should meet strength and wear resistance requirements. For low-speed, light-load, or smooth transmission, sprockets can be made of low- or medium-carbon steel; for medium-speed, medium-load transmission without severe impact, medium-carbon steel with quenching treatment is used, with a tooth surface hardness HRC>40~45; for high-speed, heavy-load, or continuous operation transmissions, low-carbon alloy steel with surface carburizing and quenching or medium-carbon alloy steel with surface quenching is used. For low-speed, light-load transmissions with a large number of teeth, cast iron sprockets of at least HT150 are also permissible. Because smaller sprockets have more meshing times than larger sprockets, the material requirements are also higher. When large sprockets are made of cast iron, smaller sprockets are usually made of steel. For plate sprockets that do not require heat treatment, Q235, Q345 (16Mn), or 10 or 20 steel can be used. The hardness is generally below HB140, suitable for medium-speed, medium-power, and larger sprocket machining. Sprockets requiring heat treatment are generally made of 45 steel…

Sprocket Maintenance: 1. The sprocket tension should be appropriate. Too tight a tension will increase power consumption and cause bearing wear; too loose a tension will cause the sprocket to jump and derail. The appropriate tension is: when lifting or pressing down the sprocket from the center, it should be approximately 21-31/3 the center distance between the two sprockets. 2. The sprocket should not wobble or tilt when mounted on the shaft. In the same transmission assembly, the end faces of the two sprockets should be in the same plane. When the center distance between the sprockets is less than 0.5 meters, a deviation of 1 mm is acceptable; when the center distance is more than 0.5 meters, a deviation of 2 mm is acceptable. However, there should be no friction on the side of the sprocket teeth. Excessive misalignment can easily cause derailment and accelerated wear. When replacing sprockets, the misalignment must be checked and adjusted. 3. When the sprockets are severely worn, both the sprocket and the new sprocket should be replaced simultaneously to ensure good meshing. Do not replace only the sprocket or the new sprocket. Otherwise, poor meshing will accelerate the wear of the new sprocket or the new sprocket. …

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Methods for selecting sprocket chains 1. When selecting roller chains, the following 7 conditions should be considered 2. Determine the usage coefficient According to the type of machinery to be transmitted and the type of prime mover, the usage coefficient is determined by using the coefficient table (Table 1). 3. Determine the compensation transmission power (kW) The compensation transmission power (kW) is compensated using the usage coefficient. K For single-row chains E Compensation transmission power (kW) = Transmission power (kW) M Usage coefficient K For multi-row chains E According to the multi-row system  4. Select the number of teeth of the chain and sprocket 5. Select the number of teeth of the large sprocket 6. Check the shaft diameter 7. Shaft spacing of the sprocket 8. Calculate the chain length and the center distance between the shafts of the sprocket Lp: Chain length expressed in terms of the number of links N1: Number of teeth of the large sprocket N2: Number of teeth of the small sprocket Cp: Center distance between shafts expressed in terms of the number of links: ≈3.14 (1) Calculate the chain length (the sprocket diameter has been determined)...