Plain bearing bush bearing alloy babbitt casting and renovation repair.
Ujinwabab alloy（ zhchsnsb11-6 ）The pouring of water. The tools prepared are one Melting furnace, melting babbitt alloy with graphite crucible; two Tin lining furnace; three Preheating furnace: heat the tin lined bearing bush to a suitable temperature before pouring.
The casting of bearing alloy can be divided into the following methods and steps:
one Clean the bearing bush: (Note: alkali agent is used to remove oil stain, and acid agent is used to remove oxide) The oxide skin and dirt on the bearing bush can be removed by sandpaper, wire brush or sand blasting. If there is oil stain on the bearing bush, put the bearing bush into a pot for heating 300-350 Wipe with hemp brush dipped in flux solution, or put bearing bush into 80-100 Boiling and washing in alkaline water 10-12 Minutes, then put in 80-100 Boil in water 4-5 Minutes to remove alkali, and then put it into cold water for washing and drying. Composition of alkaline water 10% Of NaOH Aqueous solution or 10%-30%Naco3 Aqueous solution.
two If it is an old tile, its cleaning method: use a blowtorch to bake the tile back to make the alloy fall off, then use a wire brush or blade to remove the residual alloy, and use a rag to wipe it. This method is troublesome. The better method is to put the bearing bush into the crucible of melting alloy to melt the alloy. The bearing bush should be preheated before being put into the crucible 120-150 Degrees.
three Check and correct the steel back tile: check whether there is oxide on the inner surface of the tile back, and the surface without oxide is silver gray. If there are golden yellow or brown oxidation spots, apply 30% Rust removal solution pickling, or wipe with wire brush.
four Re degreasing: methods and one Similarly, check with the water drop method. After the water drops are placed on the tile back, the water drops should be able to disperse immediately without any accumulation.
five Tin plating: after cleaning, a layer of tin is plated on the bearing bush so that the bearing bush can be firmly bonded with the alloy when casting bearing alloy. （ one ）Preparation before tin plating: before tin plating, apply a layer of protective film on the non poured surface of the bearing bush. The formula of the protective film is as follows: 40% White powder, 40% Water glass, 20% Water mixture, or 20% Water glass, 80% Water mixture. And reheat one hundred and forty Degree drying. Then coat a layer of flux on the tin plated surface of the bearing bush to make the tin and the bearing bush better combined.
（ two ） . Tin pot heating: put the tin pot four hundred and twenty Degrees and every one Spray a layer of deoxidizer on the surface of the tin solution to deoxidize it after about hours, so as to ensure the purity of the tin solution, and ensure that the content of tin is within 99.5% Above, general application two number three No. tin. （ three ）Tin plating: tin plating operation time is not easy to be long, easy to be oxidized, affecting the quality of tin plating.
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