From the 8500 stone mill main reducer to the research and manufacture of 124 from the 8500 stone mill main reducer Ding 24 Gao Hui Hua Hongbao Jiangsu Jinxiang Reducer Co., Ltd. before the domestic introduction of the heavy calcium production line, with its efficient and stable performance in The domestic market accounts for a large market. Some domestic chemical mining machinery factories have researched and manufactured such production lines to replace imported ones. However, the worm drive main reducer of the key component stone mill, because it directly drives the grinding rod to grind the stone, As a result, the working conditions of the main reducer are relatively bad, making the main reducer a vulnerable part. Previously, such a main reducer and its spare parts depended directly on imports, so it took a lot of foreign exchange to introduce the spare parts every year.
In order to reduce the cost of spare parts and improve the manufacturing level of domestic worm gears, Jiangsu Jinxiang Reducer Co., Ltd. has carefully studied and analyzed the 24 main reducers used by Nanling Yingge Porcelain Co., Ltd., and redesigned the worm gears. The Nieman worm drive was used to optimize the partial meshing parameters, and a series of special techniques were used for localization.
Based on the above situation, Jiangsu Jinxiang Reducer Co., Ltd. carefully analyzed the use requirements and operating conditions of the worm gear, and considered that the worm gear drive of the reducer is a multi-head small-speed ratio transmission, which should be used, 130-tooth open worm drive And must adopt a series of special process means in the development process to achieve higher processing accuracy, in order to meet the use requirements.
Introduction to the entanglement form The helicoid surface of the Niemann worm is the envelope surface of the convex arc-shaped circular disk cutter, which is the envelope surface of the worm helicoid. Compared with the ordinary worm drive, the Nieman worm drive has an increased equivalent radius of curvature in the contact zone and a significant improvement in contact strength. The tooth surface of the worm can be ground by a disc-shaped grinding wheel, which has good manufacturability and guaranteed manufacturing quality.
The tooth angle of the grinding wheel busbar at the calculation circle is the tooth shape angle at any point. The worm screw angle is taken as the internal tooth of the worm shaft section and half width.
1 On-site analysis 1 For the main reducer that needs to be developed, we have learned and analyzed the use of the reducer.
1.1 On-site situation m1 meal number reducer center distance 3=609.6; temperature 370, there is impact phenomenon.
Damage situation Ordinary worm drive gear teeth a little eclipse and wear wheel teeth broken between the worm gear and the hub with loose screw connection loose, the worm tooth surface is good and basically no damage, the main reducer 1 body is prayed from the scene and damaged reducer In the case of the main reducer, except for the worm pair, the other parts are not damaged. Therefore, the main question of the research and manufacture of the main reducer is to study and manufacture the worm and worm gear drive. The original reducer adopts the ordinary worm drive. Although it can realize the needs of the transmission, it can not meet the requirements of the bearing. The old 331 worm drive is a new type of transmission invented by Professor Muni, Germany, and the worm gear transmission. It has the characteristics of high carrying capacity, high efficiency and high processing technology, especially the multi-head small speed ratio, so its application range is very wide. In the development of Nieman worms abroad, the technology has reached a very high level, the number of worm heads has been 9, the industrialization technology has become a grinding wheel busbar and work clothes and the equation can be determined in the following way. The grinding wheel is marked with 2, 7 and 2, B, 2 of which are round and 5 round with the grinding wheel. Solid connection 2, the hook wheel is fixedly connected, and 0 is the rotation angle parameter of the grinding wheel bus. Taking the mouth as the corner parameter of the grinding wheel busbar and passing the coordinates of B. 8500 stone mill main reducer, the research and manufacture of the grinding wheel face equation is wCosyw grinding wheel worm meshing equation and worm tooth surface equation worm worm gear meshing equation, etc. It can be determined according to the principle of meshing, and is omitted here.
Conducive to the formation of the oil film on the tooth surface during the use of the main reducer, the worm wheel cuts the small angle of the hob after the main cutting is completed.
Due to the large center distance of the reducer, it is difficult to disassemble and assemble. In order to ensure the success rate of the whole machine assembly, the process worm is used for the trial assembly of the reducer, and the meshing of the worm pair and the status of other parts of the reducer are comprehensively investigated and recorded. The size, based on this, controls the machining of the worm gear pair, so that the reducer achieves a better assembly effect.
In order to make the reducer versatile, the overall installation dimensions of the original reducer can be interchanged with the original reducer. The design of the worm gear set (1) is the same as the original reducer with the design center distance and speed ratio. As a premise, according to the experience of the meshing research, the parameters are designed with the aim of the reasonable meshing instantaneous contact line of the worm gear. The results are as follows.
The number of worm heads is 5, the grinding wheel is indexed by the scalloped angle, =23, the radius of curvature of the grinding wheel busbar is 7=88, and the worm indexing circle has a spiral angle of 1=2, which is centrifugally cast by the iron mold to ensure its wear resistance and wear reduction performance; The worm has better performance than the standard specified material 516, and the 20 2,1 has excellent comprehensive mechanical properties after carburizing and quenching.
Because the worm wheel has a broken tooth phenomenon, the weak link is in the worm gear tooth. In the design, the worm tooth thickness is 0.350.47, which increases the worm gear tooth thickness to strengthen the tooth bending strength and reduce the possibility of broken teeth. (4) Worm wheel The flange and the hub are connected by a hinged bolt to replace the fastening screw connection, which can ensure the positioning accuracy and the connection strength.
Due to the relatively high ambient temperature, the worm drive reducer itself also generates high thermal energy. The heat exchange area of ​​the cooling tube is increased during design to improve the cooling effect.
Jiangsu Jinxiang Reducer Co., Ltd. has many high-precision machining machines, which can guarantee the precision requirements of the main reducer such as the box body. Therefore, the worm and worm gear processing of the main reducer is still the main question.
The use of cutting-edge equipment and design-specific process equipment ensures the machining accuracy of the worm and worm gear. The CNC worm grinder imported from Germany has a grinding precision of 54 and a surface roughness of 0.2, which can be interchanged after machining the worm. For the cutting of the worm wheel, in addition to the material, the following measures are taken: (1) special hobbing tooling is made to ensure the installation reference and design basis of the hobbing processing; 0 special hob is made to ensure sufficient worm gear cutting and prevention Unexpected contact points occur when the worm gear is meshed, and the tangential feed of the hob is increased during the worm rolling process; 3 ensure the hob parameters as much as possible while ensuring reasonable tooth shape correction With the worm, the same edge CNC worm grinder is used to grind the cutting edge of the hob; (4) The main reducer has been successfully manufactured in order to ensure the contact position of the worm drive mesh contact surface and the use effect and conclusion. After completing and delivering the user, the user has been used for partial load after the moon-running operation. The speed reducer has no abnormal impact and vibration phenomenon. The height direction of the gearbox of the reducer reaches 60, and the length direction reaches 3556, which is affirmed by the user. At present, the main problem is that the noise of the two directions of the reducer is not good. After analysis, the main reason is that the trajectory of the flank is not changed due to the cutting motion on both sides of the tooth surface. In addition, the split surface and the hobbing process in the worm wheel are assembled. There is no fixed influence on the face. After the speed reducer is used for a period of time, the noise will not be gradually reduced.
In the development process of the main reducer, many special problems occurred in the processing process were solved, and a lot of valuable experience was obtained, which has great reference and guiding significance for the development of new products.
Textual research 2 Yang Lanchun et al. Worm Drive Manual. Shanghai East China Institute of Chemical Technology Press, 1990.
3 Editorial Board of China Mechanical Design Dictionary. China Mechanical Design Master Plan 4 volumes. Jiangxi Jiangxi Science and Technology Press, 2002.
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