The reason for the failure of the sliding bearing (1)

Source: Bearing network time: 2018-06-16

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1. Data and roughing elements (1) Poor connection between the lining and the backing This is the primary problem of sliding bearings for casting tin-based or lead-based bearing alloy linings. The outstanding connection enhances tin-based and lead-based bearing alloys and helps The heat dissipation of the outer surface of the bearing bush. In order to be excellent in connection; the tin must be hanged on the backing contact surface before casting the tin-based and lead-based bearing alloy; the temperature of the backing and bearing alloy is strictly controlled.
When the bearing scale is agreed; use tin bath method to hang tin; the temperature of tin bath in pure tin bath should be kept at 280 ~ 300 Â° C; the temperature of tin bath in solder bath should be kept at 270 ~ 300 Â° C; immersing bearing bush in tin liquid; When the temperature reaches the temperature of the tin liquid, it can be taken out. The large bearing bush can be tinned by the tin method; firstly, the bearing pad is heated by the flame; then the pure tin or solder is applied to the outer surface of the tin to be hung.
Practice has proved that the wedge groove in the appearance of the backing cast lining not only does not help the backing and the lining; but cuts at the sharp corner of the shoulder; stress concentration will cause cracks.
(2) Bearing bushes with large-sized stomata or lead-based bearing alloy linings; when the casting temperature is too low or the backing is insufficiently preheated; the backing of the lining will show bubbles. These bubbles are not conducive to the bearing surface. Heat dissipation; it also weakens the tin- or lead-based bearing alloy lining. When casting a cast copper-based alloy; because the hydrogen in the copper alloy is released; it will form loose.
(3) Grain coarseness This is a unique problem of tin-based and lead-based bearing alloy liner bushings. During the cooling and solidification process of cast bearing alloys; if the cooling rate is very slow, the scale of tin-bismuth grains will exceed 0.1 mm. The naked eye can be observed. Such intermetallic compounds are easily broken; they break away from the conflicting appearance after fragmentation; they become particles entering the lubricating oil circulation system; forming bearing damage.
(4) Uneven copper and lead are not co-dissolved; therefore, the bearing bush is made of copper-lead alloy which is a copper-based bearing alloy; it can exhibit the uneven distribution of lead. After casting, the copper-lead alloy can be cooled agilely to avoid uneven distribution of lead. The use of powder metallurgy to make copper-lead alloy bearing bush; can completely solve the problem of uneven distribution of lead in copper-lead alloy.

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