Why do high-altitude vehicles form carbon deposits? 1. Because of the carbon particles contained in the "lubricant" helium gas, a large amount of carbon particles are deposited incomplete combustion. The aerial vehicle itself also contains various impurities, and it will form sludge-like deposits in fuel tanks, oil inlet pipes, and engines. 2. Because of the olefins in the gasoline of the aerial vehicle, a gum and a resinous viscous material will be formed after combustion. These stickies deposit on the nozzle, intake valve, combustion chamber (cylinder head and piston top) and other parts will become hard carbon deposition. 3. As the air sucked by the aerial vehicle contains fine dust, it cannot be completely filtered out at the air filter. After entering the engine, it accumulates at a high temperature for a long time and mixes the wax in the fuel to form carbon deposits. 4. Long-term low speed and high-speed operation of the aerial vehicles will speed up the formation of carbon deposits. What is the danger of excessive carbon deposition? 1. Decrease the engine power of aerial vehicles, so that the power output is not uniform and gradually decays, in other words, it is becoming less and less powerful. 2. The fuel consumption of aerial vehicles will gradually increase. 3. The cold start is difficult, and when the vehicle is cold, it is easy to turn off the engine. 4. The deflagration of the carbon in the combustion chamber will be severe, causing the engine of the aerial vehicle to shake significantly. 5. The tail gas emissions of high-altitude vehicles will deteriorate, shortening the life of components such as spark plugs. 6. Affects the sealing performance of the piston rings of aerial vehicles, causing the engine to burn oil. How to prevent carbon deposition in high-altitude truck engines? 1. Fill high quality gasoline, but high marks do not equal high quality. 2. Do not drive the aerial vehicle at idle speed for a long time. 3. Multi-run high-speed, manual transmission can increase the shift speed. 4. It is found that there are obvious burning oil phenomena that must be checked and repaired in a timely manner. |
The use of molds has a life span. When the use of a pair of molds exceeds its life span, the molds should be replaced in time, so the mold production process has certain repeatability.
Milling, boring, drilling, reaming, tapping and other processes are also used in regular mold processing.
The main material of the mould is high-quality alloy steel. Some moulds with a long service life are often made of Crl2, CrWMn and other ledeburite steels. The production and processing of this material is very strict, so the processing process cannot be ignored. The thermal deformation treatment is also an aspect that needs to be taken seriously in the processing. To sum up, when selecting the airport, the processing conditions should be met as much as possible, such as strong functionality, high accuracy of machine tool, good rigidity, good thermal stability, and anti-type function.
Some surface shapes are composed of multiple curved surfaces, such as automobile cover parts, aircraft, parts, toys, household appliances, etc., so the surface of the mold cavity is very easy to be complicated, and some can be processed through mathematical calculation.
Some molds have neither drawings nor data in the production process, and can only be imitated through physical objects, which requires high imitation accuracy and no deformation.
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