Scraping bearing shell method and matters needing attention

Scraping bearing shell method and matters needing attention of 2019 - 09 - 07 ( 1) Check the contact condition of bearing and shaft neck, specific practices are as follows: the bearing inner surface and the shaft neck clean first, then on the journal are coated with a thin layer of red lead ( A mixture of red lead powder and oil) , the bearing pressure on the shaft neck, along the circumferential direction at the same time to make reciprocating sliding shaft neck, after several times to get off bearing shell, check the contact situation, you will find bearing inner surface with red oil, black spots, the light point, also there are infected with no red oil. No red oil showed no contact bearing and shaft neck and clearance; Have red oil points showed no contact bearing and shaft neck, but the gap is small; Black dot indicates that it is higher than red oil point, bearing and shaft neck slightly contact; The light point most bearing contact with the journal, also for the top. （ 2) Bearing scraping using triangular blades and willow leaf blade more, every time scraping is aimed at the highs, the more close to finish scraping the more lightly scraping. Mark the time and the time to cross shaped, so as to ensure the flow of oil bearing runtime does not tend to one side. Bush every scraping, check with the color printing once contact, until meet the requirements. （ 3) Should be paid attention to while scraping bush: outside contact Angle, the gap should scrape the corresponding, in order to form a wedge of oil film; Do not use cloth to clean tile surface, because of the cloth is easy to fall off the sand attached to the tile surface, shaft and bearing damage in operation; The same fan shell when two people by scraping, to cooperate with each other well, so as to avoid scraping in various error is produced.