機械專業(yè)畢業(yè)設計--外文資料和翻譯-其他專業(yè)-展示頁
2025-01-31 12:28本頁面
【正文】 nnealing. Ball annealing available in several different methods, but all the methods are needed in A1 line near (usually slightly low temperature preservation) for a long time, make the iron carbon pounds formed more stable, low level of small ball. Ball annealing method of the main objective is to improve the cutting processing, and drawing of hardened steel pretreatment, make it more uniform structure quenching. Because of the heat treatment for a long time, so the cost is higher than that of ball annealing is mon or annealing. Four, steel sclerosis The most hardened steel heat treatment method is based on the production of martensite high. Therefore, the first step to most other treatment with monly used method austenitic. YaGongXiGang heated to Ac1 liquidus temperature, heat preservation, more about that temperature uniformly, austenitic evenly. GuoGongXiGang Ac1 above liquidus temperature preservation in steel, while about still remain iron carbon pounds. The second step is to avoid rapid cooling in the nose produces isothermal curve transformation pearlite. The cooling speed depends on the temperature and hardened steel quenching medium heat can be taken away from the surface of the ability of heat transfer and steel itself. Table 111 is some mon medium and cooling method, cooling ability of the sequence. High temperature gradient produces high stress, deformation and cracking causes, 畢業(yè)設計說明書 29 so only in the very need to produce quenching specific structures are used. When the quenching heat uniform, care must be taken to reduce the heat stress diffusion. For example, a thin stick to end its vertical quenching, is inserted into the cooling medium, so whole section and temperature changes. If the shape of a side of the workpiece cooling, and on the other side of the earlier than size change is likely to cause high stress, produce plastic flow and permanent deformation. With several special quenching method can reduce stress, defor
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