Grease six asked

Grease six q - 2019 06 - 24 what is the filling quantity of the grease in the bearing is suitable? The filling quantity of the grease had a great influence on bearing operation and the consumption of the grease. Bearing excessive grease fill in will make bearing friction torque increases, cause the bearing temperature rise too high, and lead to the loss of the grease, on the other hand, the filling quantity is insufficient or too little dry friction and damage to the bearings may occur. Filling excess fat will cause redundant grease leakage from the lubrication parts, adverse effects of brings to the mechanical operation, the suitable filling quantity of the grease has a variety of different empirical formula calculation. Generally speaking, the sealed bearing, the filling quantity of the grease to the bearing a third - of the internal cavity It is advisable to 2/3. When filling grease in the bearing temperature rise. Grease in use: why do you want to supplement and replacement? Grease will happen in the use of the oxidation, base oil, sometimes worsened by impurities mixed with the outside world and lose lubrication, or in the working process of the consumption gradually. Therefore, must be added on a regular basis and replace lubricating grease, in order to meet the requirements of parts of lubrication. Bearing lubrication cycle again according to the bearing size, relative speed, load and operating temperature, as well as the bearing sealing effect factors, such as the bearing factory mostly to dn value as the calculating standards. What are the changes grease in use quality? Grease in the working parts due to the external environment ( Such as air, water, dust, or other harmful gases, etc. ) And the effect of relative motion and the working parts to produce mechanical force ( Such as punching, cutting, etc. ) The role of the two aspects of change: (will occur 1) Chemical change: grease composition ( Base oils, thickeners) Due to the effect of light, heat and air, the oxidation may occur and base oil after oxidation generated within the trace of organic acids, aldehydes, ketones and esters such as components, thickener, fatty acids in the possible decomposition of organic metal salts and the formation of a trace organic acids, etc. , therefore, produce acid ( Grease acid value increases) Rust corrosion caused by lubrication of parts, and, and loss of lubrication and protection. （ 2) : a physical change due to mechanical action structure variation and even destruction of grease, grease consistency, lubrication effect, or due to mechanical lubrication components sealing condition is bad, cause and mixed with dust, impurities and moisture in grease and grease quality becomes poor. The method of discriminant: a. Grease with the naked eye or feel have dust, mechanical impurity, or because of the mixed with water emulsified grease to bleach, becomes shallow, or consistency decreased significantly, or there is a clear oil rancidity odor, etc. , can explain grease deterioration. b。 Use instrument analysis method, the most direct discrimination is used a little amount of sample for 1720 cm - in the samples was determined by infrared spectrometer One absorption peak. Or the determination of samples in the use of before and after the change of the absorption peak of carbonyl index for cm - 1710 With 1378 cm - 1 1 two absorption peaks. Or directly measuring the acid value of samples, if the acid value is greater than 1. 0 mgkoh/g indicates that it has begun to grease deterioration. Grease in the store to pay attention to what issues? Grease is a colloid, the structure of the fat in the use and storage will be affected by a variety of external factors. When the warehouse storage, temperature should not be higher than 35 ℃, packaging container should be sealed, can't leak into the water and foreign material. When open barrels take samples or products, do not leave the hole in the drum shape, should be get fat after sample surface smooth, prevent depressions, or base oil will be squeezed by natural gravity and infiltration of pits left by sampling, and affect the quality of the products. Can grease base oil diluted before use? Most of the grease in storage after a period of time, consistency, Namely cone into the degree of measured value) Larger, namely change the hard situation, if not more than 1 consistency, can be used directly, do not affect for general lubrication. If consistency change is very big, namely that base oil too much, may increase the mechanical parts lubrication friction resistance, increase of mechanical power consumption, unfavorable use directly. Some users have hardened ( Or thicken) Grease base oil is added to dilute, make fat consistency decreases ( The tender) After use, users should not be using this method, due to the lack of necessary homogenization processing, grease colloid stability, oil increase will affect the use. Different types of grease can mix? If the type of the base oil (same Such as are oil lubricating oil or other same kind of base oil) Fat, different soap base or thickener made of fat, usually should not be simply a mixture. Type extreme pressure grease, it contains various active component, mutual combination, additive dry mixing each other happens, the grease colloid stability or mechanical stability, affect their performance. In different types of fat mixed each other before, should make the performance of the blend to lipid determination, confirm had no obvious effect to use.