Manufacturing materials and heat treatment process of customized coroa pinhao

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According to hardness, customized coroa pinhao can be divided into soft tooth surface and hard tooth surface. The gear bearing capacity of the soft tooth surface is low, but it is easier to manufacture and has good running-in performance. It is mostly used in general machinery with no strict restrictions on transmission size and weight, and small-scale production. Because the small wheel bears the heavier burden among the paired gears, in order to make the working life of the large and small gears roughly equal, the hardness of the tooth surface of the small wheel is generally higher than that of the large wheel. Hardened gears have a high load-carrying capacity. After the gears are cut, they are quenched, surface quenched or carburized and quenched to increase the hardness. But in the heat treatment, the gear will inevitably be deformed, so grinding, grinding or fine cutting must be carried out after the heat treatment to eliminate the error caused by the deformation and improve the precision of the gear. The steels commonly used in the manufacture of gears are quenched and tempered steel, quenched steel, carburized and quenched steel and nitrided steel. The strength of cast steel is slightly lower than that of forged steel, and it is often used for larger gears; gray cast iron has poor mechanical properties and can be used in light-load open gear transmission; ductile iron can partially replace steel to make gears; plastic gears are often used In places where light loads and low noise are required, the matching gears generally use steel gears with good thermal conductivity.

customized coroa pinhao

The temperature field and flow field of the customized coroa pinhao chamber die casting were numerically simulated, combined with the results of physical and chemical analysis, the behavior and cause of the hole defects of the die casting were determined; and the variability of the process was evaluated through statistical analysis, so as to compare Quickly obtain the law of casting defects. On this basis, the process optimization and quality control measures are proposed, and the implementation results show that the defects of casting holes are greatly reduced, and the expected effect is achieved.

Defect diagnosis timing customized coroa pinhao is large in size and complex in structure. For the processed surface, some parts are not allowed to have holes, while others allow the dispersed distribution of holes, but there are certain size restrictions; for the interior of castings, some key parts require the size and distribution of holes for flaw detection to meet the corresponding inspection standards. Therefore, for this type of casting, the difficulty of design and production is increased, and the process design of the casting is often difficult to take into account the requirements of different parts of this type of casting, and the adjustable range of the production process is often very narrow. In actual production, the existence, size and distribution of hole defects in key parts of castings are often the main reasons for castings being scrapped or not. Cut out the defective part and observe it with a scanning electron microscope (SEM). It is found that some hole walls are rough and dendritic. Under high magnification, it can be seen that the bottom of the hole is connected to each other, and has the characteristics of shrinkage cavity and shrinkage defects; Some holes have smooth walls and deep holes, which have the characteristics of stomatal defects; some holes are connected together by stomata and shrinkage cavities (shrinkage porosity).