Grease viscosity is not the greater the better

It is not enough to see the quality of the grease from the perspective of the greater the viscosity. First of all, let's see what the similar viscosity of the grease is. Similar viscosity is the viscosity measured at a certain temperature and a certain shear rate, which reflects the variable that the viscosity of the grease changes with the shear rate at a certain temperature. The similar viscosity of the grease decreases with the increase of the shear rate. When the shear stress on the grease exceeds its strength limit, it will flow. When the grease flows, internal friction will also occur. The similar viscosity characterises the internal friction characteristics of the grease. The viscosity when the grease flows is not a constant at a certain temperature. It is a variable that changes with the shear speed between the grease layers. During the shearing speed, its viscosity is large.When the shearing speed increases, its viscosity becomes smaller. When the shearing speed is large, its viscosity is small to a certain extent and remains constant. The similar viscosity of the grease is an important basic characteristic of the grease, which affects the grease in the machinery. When the grease is lubricated on the bearing and other friction components, it replaces the solid friction on the friction surface of the machine with its internal friction. Therefore, the viscosity of the grease has a great impact on the power consumption of the machinery using the grease. If the similar viscosity of the grease used is large, it is obvious that the friction loss. It is also relatively large. The viscosity of the grease changes with the shear speed, which makes it have special adaptability when it is used in machinery with frequent changes in speed. When the speed is high, the viscosity of the grease is required to be low. At this time, the directional structure of the grease fibre is severely damaged. At this time, the viscosity becomes low. When the speed of rotation is slow, the viscosity of the grease is required to be large, and The viscosity of grease is also large when the shear rate is low.The viscosity of grease with the change of shear speed basically meets the requirements of the viscosity of grease due to the change of mechanical speed. The viscosity of grease at a very small shear speed has a lot to do with the start of the lubricated friction part. Because the grease has a high viscosity during the shear speed, so at this time, if the grease The viscosity will increase the starting resistance. Especially when the similar viscosity of the grease increases at low temperature, it will affect the low temperature start-up and even make it difficult to start. In fact, the force required to overcome the flow resistance of the grease in the shear speed is much greater than the force required to overcome the strength limit. It can be seen that the grease The similar viscosity is not the bigger the better, nor does it represent the quality of the grease, so the best way to choose grease is to synthesise various conditions and working conditions

[@user-mg5bt8re8q]

اريد ان اعرف طرق التصنيع

[@huizhang-lx6qt]

يمكنك إضافة بلدي WhatsApp ：[phone]