The influence of thick rub on forging process
2022-10-14
The friction in forging process is the friction between two metals (alloys) with different composition and characteristics. It is the friction between soft metal (workpiece) and hard metal (die). In the case of no lubrication, is the contact friction of the oxide film on the surface of two kinds of metal; Under lubricating conditions, for the two kinds of metal surface oxidation film respectively and the contact friction between the lubrication medium, and the workpiece inner layer of metal is extruded to form a new, not enough time to be oxidized, adsorption between the surface and the lubrication medium and mold surface friction and the actual friction (contact) area is increasing.
In the forging process, usually blank deformation distribution is not uniform, often friction is also uneven distribution, in the friction of the large part will have poor lubrication or lack of lubrication. In general, it is hoped to reduce the friction between the workpiece and the die, but sometimes in order to make the difficult part of the metal mold cavity, but to increase the friction of other parts, in order to facilitate uniform deformation of the blank.
Due to the friction characteristics between the blank and the contact surface of the die in the forging process described above, the following results will result:
(1) Friction causes the deformation force to increase by 10%? 100%, energy consumption increases;
(2) friction leads to uneven deformation of forgings, so that the internal grain structure and performance are not uniform, and the surface quality is reduced;
(3) friction leads to the reduction of the geometric shape and dimensional accuracy of the forging, and serious dissatisfaction leads to the scrap of the forging;
(4) Friction leads to aggravated wear and shorten the life of the mold;
(5) Increase the local friction resistance of the mold cavity, can make the mold cavity filled with metal smoothly, reduce the rejection rate.
In the forging process, usually blank deformation distribution is not uniform, often friction is also uneven distribution, in the friction of the large part will have poor lubrication or lack of lubrication. In general, it is hoped to reduce the friction between the workpiece and the die, but sometimes in order to make the difficult part of the metal mold cavity, but to increase the friction of other parts, in order to facilitate uniform deformation of the blank.
Due to the friction characteristics between the blank and the contact surface of the die in the forging process described above, the following results will result:
(1) Friction causes the deformation force to increase by 10%? 100%, energy consumption increases;
(2) friction leads to uneven deformation of forgings, so that the internal grain structure and performance are not uniform, and the surface quality is reduced;
(3) friction leads to the reduction of the geometric shape and dimensional accuracy of the forging, and serious dissatisfaction leads to the scrap of the forging;
(4) Friction leads to aggravated wear and shorten the life of the mold;
(5) Increase the local friction resistance of the mold cavity, can make the mold cavity filled with metal smoothly, reduce the rejection rate.
It can be seen that friction is a double-edged sword in forging production, which has both advantages and disadvantages. Therefore, the friction in forging process must be strictly controlled to ensure the normal progress of forging process.
this is forgings produced by tongxin precision forging company
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