Appropriate attention should be paid to the selection of the ingredients added to the lubricating oil. If corrosive substances such as water and chloride are present in the oil, the metal tooth surface will be rusted, causing cracks, and the bubbles in the oil will also cause the metal to fall off prematurely. In summary, the selection of a suitable viscosity of the lubricating oil has an important impact on the gear transmission. Selecting a larger viscosity oil can reduce the friction coefficient and contact stress, is less prone to cracks, and the oil does not easily enter the crack, making pitting and flaking difficult to expand. .
Tooth surface temperature is not the only condition that causes gluing to occur, but only a requirement that the generation of gluing is the result of a combination of dynamic and dynamic effects of the system. There are many factors affecting the bonding. In terms of lubrication, the viscosity, type and lubrication method of the lubricating oil have a certain degree of influence on it. In general, the higher the viscosity of the lubricating oil, the higher the gluing limit load value. Lubricating oil of a certain viscosity can often act as a buffer for vibration absorption of a gear transmission with an impact load. In addition, under the condition of the pressure of the lubricating oil, the viscosity will increase correspondingly with the increase of the pressure, and this characteristic will have a great influence on the bearing capacity of the lubricating oil film.
They rely mainly on the viscosity to create a fluid lubricating film between the tooth working surfaces to reduce and prevent the occurrence of gluing. The greater the viscosity of such lubricants, the better the gluing resistance; for the composite mineral oil with the oil agent added, due to The adsorption of oily molecules can form a stronger oily boundary film than pure mineral oil to resist gluing. Another extreme pressure gear oil can be produced from certain components in the metal due to the additives contained in the oil. The chemical reaction produces a highly resistant chemical reaction oil film on the tooth working surface. This inorganic coating oil film has high strength, can withstand large loads, and is more resistant to gluing.
In addition, the supply amount of lubricating oil and the lubrication method also have a certain influence on the generation of gluing. The specific performance is as follows: the more sufficient the oil supply, the higher the gluing limit load of the oil can be improved, but it has been proved by practice that when the oil supply amount is more than a certain degree This situation will no longer appear. In terms of lubrication method, oil bath lubrication and fuel injection lubrication are commonly used lubrication methods in gear transmission. For the cooling effect of high-speed gear transmission, the lubrication effect of the injection is better, and the nozzle is placed on the gear teeth. The piercing end is more suitable. It turns out that when the gluing phenomenon occurs, the temperature rise rate of the tooth surface also increases, and the visible scratches of the naked eye can occur, and the noise of the transmission is also significantly increased, which will seriously affect the normal operation of the gear box.
Self-Shielded Flux Cored Wires
Self-Shielded Flux Cored Wires:
The self-shielded Flux Cored Wire protects the molten droplet and molten pool through the gas and slag produced by the slag-forming agent and gas-generating agent in the flux core of the welding wire under the high temperature of the arc.
The self-shielded flux-cored arc welding method has the following advantages:
1. No external protective gas source is needed, the welding torch is simple in structure, light in weight, and easy to operate;
2. The performance of wind resistance and porosity is good. During welding, the metallurgical reaction of the welding wire itself forms a protective atmosphere. It can be welded under the fourth-level wind force. As long as the wind speed does not exceed 8m/s, no protective measures need to be taken. It is especially suitable for Field construction work;
3. The arc penetrating power should be large, the molten drop should be in the form of jet transition, and the splash should be small;
4. It has excellent all-position vertical down welding operation process performance, and the operation process performance is good;
5. Good slag removal performance;
6. The deposited metal can also obtain high low temperature toughness under various harsh conditions such as low temperature and strong wind.
Self-shielded flux cored wire is widely used in pipeline construction, marine engineering, outdoor large-scale steel structure manufacturing, high-rise steel structure buildings, surface surfacing, etc.
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