Introduction to the Skills of Importing Sliding Bearings
Sliding bearings are essential components in many mechanical systems, and their proper installation and maintenance play a crucial role in ensuring smooth operation and longevity. When importing sliding bearings, it's important to understand the key techniques that ensure optimal performance and reliability.
One of the fundamental requirements for installing a sliding bearing is ensuring that both the journal and the bearing surface are evenly and finely aligned. A certain level of clearance must be maintained between them to allow for proper lubrication and movement. This gap helps prevent excessive friction and wear during operation.
The "touch angle" refers to the central angle over which the journal makes contact with the sliding bearing. It’s important to maintain an appropriate touch angle—neither too large nor too small. If the touch angle is too small, it can increase the pressure on the bearing, leading to deformation, accelerated wear, and a shorter service life. On the other hand, if the touch angle is too large, it may interfere with the formation of the oil film, reducing the effectiveness of liquid lubrication. Research suggests that the maximum allowable touch angle is around 120 degrees. Once this angle is reached, the lubrication becomes less effective, and the bearing may begin to experience damage.
From a theoretical perspective, the ideal touch angle depends on the operating conditions. For example, when the rotational speed is below 500 rpm, a 90-degree touch angle is typically recommended. At 500 rpm, a 60-degree angle is more suitable. The smaller the touch angle, the lower the opposing moment, which can help reduce stress on the system.
Another important factor in evaluating the quality of a sliding bearing is the number of "touch points" per unit area. These points represent the actual contact areas between the journal and the bearing surface. A higher number of touch points indicates a finer and more uniform contact, which is essential for achieving a good scraping finish. The more evenly distributed the touch points are, the better the bearing will perform. However, achieving a high density of touch points requires greater skill and precision during the scraping process.
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