The plane that includes the principal The machined recess in a die that gives the forging its shape. face and is perpendicular to the direction of The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. travel. When parting surfaces of the The metal blocks into which forging impressions are machined and from which forgings are produced. are flat, the The plane that includes the principal die face and is perpendicular to the direction of ram travel. When parting surfaces of the dies are flat, the forging plane coincides with the parting line. coincides with the (1) The line along the surface of a forging where the dies meet, usually at the largest cross section of the part. Flash is formed at the parting line. (2) The plane that divides the two forging die halves..