METHOD OF OBTAINING CONTACT INSERTS OF TROLLEYBUSES Russian patent published in 2017 - IPC B22F3/20 B60L5/08 

FIELD: electricity.

SUBSTANCE: powder compositions based on carbon from the press container are extruded through the mouthpiece to produce a semi-finished product in the form of two insert blanks facing each other with their soles and separated by the divider with opposite profile working surfaces. The profile working surfaces are calibrated in a four-roll pass with two profile drive rolls. Prior to the calibration of the profile working surfaces and thereafter, the inclined inlet and outlet sections of the insert blanks are compressed in the forming pass of the profile drive rolls with a normal specific force of 45÷50 MPa.

EFFECT: improving the quality of contact inserts.

2 cl, 2 dwg