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Peculiarities of rolling bronze alloys

• - Bronze ingots of small mass are rolled only in a cold state;
• - Hot rolling of bronze semi-finished products of large dimensions is carried out with heating to temperatures not lower than 750 ... 800 ° C, heating is carried out in furnaces with an oxidizing atmosphere. Otherwise the alloys are saturated with hydrogen, which increases their brittleness;
• - The rolling speed is taken as maximum possible for the given size of equipment (usually not less than 10 m/s);
• - The number of allowable reductions depends on the chemical composition of the bronze. Minimum deformation (not more than 55...60%) should be assigned for beryllium bronzes.

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Machining of bronze alloys

When machining bronze alloys by forging and stamping, the following factors are taken into consideration:

• - Considering the rapid cooling of bronze after deformation, forging and stamping should be carried out at temperatures not less than 850...900°C;
• - The compression for each working stroke of the deforming tool is assigned using the recrystallization diagrams of the corresponding grade of the bronze alloy;
• - When forging and stamping in closed dies, the resistance to deformation increases, which should be compensated by an increase in the rate of deformation. Therefore, forging should be carried out on steam or pneumatic hammers, and stamping - on hammers or screw presses;
• - In order to prevent surface defects bronze semi-finished products before deformation is recommended to grind on lathes, and to remove minor flaws on the surface use abrasive (roughing) grinding.

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