Materials and blank manufacturing factors

(1) lining and backing combined with the adverse

This is the casting of tin-based or lead-based bearing alloy lining of sliding bearings. Good combination of tin base and lead-based bearing alloy can enhance and contribute to the cooling of the bearing surface. In order to combine good casting tin base and lead-based bearing alloy must backing combined with the surface of tin-plate, and strictly control the temperature of the backing and the bearing alloy.

When the bearing size is permitted, with the tin bath and tin-plate, pure tin bath tin liquid temperature should be maintained at 280 to 300 ℃ tin liquid solder bath temperature should be maintained at 270 to 300 ℃ bush immersion tin solution, when the bush temperature reaches the temperature of the liquid tin can be removed. Large bearing crossing tin of tin-plate can be used, the flame will first bearing heating, and then the pure tin or solder coating on the surface of the tin-plate.

Practice has proved that the surface of the backing cast liner to make wedge-shaped groove will not help the combination of backing and lining, and cut the sharp corners of the groove shoulder, stress concentration will lead to cracks.

(2) stomatal

Large tin-based or lead-based bearing alloy lining bearing, casting temperature is too low or backing inadequate warm-up, backing liner combined with the surface there will be a bubble. These bubbles are not conducive to the bearing surface of the heat, it will weaken the tin-based or lead-based bearing alloy lining. The casting of cast copper alloy, copper alloy hydrogen is released, will result in osteoporosis.

(3) coarse grains

This is a tin-based and lead-based bearing alloy lining axis watts problems. Bearing alloy casting cooling the curing process, the cooling rate is very slow, the grain size of tin and antimony will be more than 0.1mm, the naked eye, can be observed. This intermetallic compounds are easily broken, cracked from the friction surface, as particles into the oil circulation system and cause bearing damage.

(4) lead uneven distribution

The total copper and lead is not dissolved, so the bush is a copper-based bearing alloy of copper and lead alloy may lead to uneven distribution phenomenon. After casting the copper-lead alloy rapidly cooled to prevent the lead to uneven distribution. Powder metallurgy method of manufacturing a copper-lead alloy bearing, can completely solve the copper-lead alloy lead to uneven distribution problem.


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