Our main products are Backpack Display Rack, Fragrance Counter Display, Skincare Bar,Beauty Bar,Skincare Bay,Makeup Display Shelving and all kinds of Floor Display and fixtures. We have implemented a strict and complete quality control system involved in all producing procedures, ensuring the products can meet quality requirements of customers. To learn more about what we can do for you, contact us at any time. Will provide you with our sincere service. Looking forward to establishing good and long-term business relationships with you for mutual benefits. Backpack Display Rack,Retail Store Display Rack,Acrylic Backpack Display Rack,Retail Store Backpack Display Rack Dongguan Golden Memory Display Products Co., Ltd. , https://www.dggmdisplays.com
Gear teeth breaks generally occur at the root of the tooth. One is that the root stress changes continuously due to the normal pressure Fn moving along the tooth surface (if the unilateral force, the root bending stress is the pulsating cyclic stress; if the two sides are subjected to the force, the root bending stress is a symmetric cyclic stress), At the same time, there is stress concentration, which causes fatigue cracks in the root. After a long-term stress cycle, the cracks continue to expand, causing fatigue fracture of the entire tooth. The other is due to a severe overload in a short time, causing the teeth to suddenly break. The fracture form can be judged from the fracture. The fatigue fracture is repeated and squeezed at the source of the microcrack fatigue, and finally the fracture is caused. Therefore, most of the fracture area is bright and flat. The fracture that is suddenly broken is rough. In addition, the more common ones are random broken teeth, which are broken teeth caused by accidents. The distinguishing feature is that the broken portion of the tooth is not where the bending stress of the tooth root is the greatest, and it may be broken at any part of the tooth, including the whole tooth breaking or the partial break of the tooth. Analysis of design parameters When selecting an unreasonable design, the gear modulus selected is too small, resulting in a large bending stress of the root. When the safety factor is at a critical value, the load increases, such as yield increase, equipment aging, product change, etc. May cause breakage of the gear teeth.
Improper maintenance, for example, when the new equipment is put into production, the gear transmission has a running-in period. During the running-in period, due to manufacturing and assembly errors, as well as surface irregularities, the meshing teeth actually only partially contact the tooth surfaces. Therefore, in the initial operation process, the parts that are initially contacted will suffer from wear and tear first due to the large force per unit area. However, when the gear is operated for one period, the actual contact area between the meshing tooth surfaces increases, the force per unit area is relatively reduced, and the lubrication condition is further improved, so that the initial tooth surface wear phenomenon Will gradually disappear. This process is the running of the gear drive (run-in). The gear wear phenomenon that occurs during the running of the gear transmission is called running wear. It can be seen that the wear and tear wear is not only harmless to the gear, but also a necessary course of the new gear transmission during the trial operation. The length of the gear drive running time is related to the roughness of the harder tooth surface. If the hard tooth surface is rough, the running time is long; the harder tooth surface is smooth, and the running time is short. Therefore, the design requires a harder tooth surface with a smaller roughness. Practice has proved that the better the gears run, the better the meshing situation. In order to avoid abrasive wear during running, the lubricant should be replaced regularly. If the high-speed full-load operation during the running-in period, the wear will be aggravated, the wear debris will be generated, and the abrasive wear will be formed. The tooth surface wear will cause the shape of the tooth to change, and the tooth thickness will become thin, which can cause the teeth to break. For example, a ZL-50C loader (engine type 6135K-9a) during construction, the driver feels that the machine is loading gradually weak, observe the instrument, found that the water temperature is high, the oil is not pressure, so immediately stop the inspection.
Protective measures determine the design parameters reasonably. In the optimization design of gear parameters, in order to improve the bending strength of the gear, a larger gear modulus should be selected within the scope of the conditions, taking into account the increase in output, equipment aging, product changes, etc. during the use of the equipment. The factor causes the gear load to increase and the safety factor should be greater than the critical value. Improve the machining accuracy and installation accuracy of the gears. Increase the radius of curvature of the fillet at the root transition, eliminate machining marks at the location, and pay attention to the detection and elimination of internal defects in the material. Increase the rigidity of the shaft and the support to improve the installation accuracy and avoid large vibration and eccentric load. Reasonable choice of materials and heat treatment methods. Eliminate the fine cracks and residual stresses generated during processing and heat treatment, especially when grinding gears, correctly select the material, hardness and grinding process parameters of the grinding wheel to avoid grinding cracks. Proper use of equipment, maintain good lubrication, run-in period to avoid frequent starting, reversing, no overspeed, not full load, diligent inspection, select the right viscosity of the lubricant, regularly change the lubricant to avoid the broken teeth caused by wear. Conclusion In summary, if we strictly control the design, material selection, manufacturing, installation and use of gears, we can avoid the occurrence of broken teeth to a large extent.