PROCESS FOR PRODUCING A MOLDING

摘要

The invention relates to a process for producing a molding, comprising a disk-like or plate-like basic body -5- having a large number of knob-like and/or web--like elevations -4-3- which merge into the basic body -5- with inclined side surfaces, by means of pressing and sintering powdery raw materials close to the final shape. According to the invention, the pressing is carried out in a two-stage pressing operation. In the first stage the boundary surfaces of the basic body -5- are pressed to at least the approximate final shape as far as the transition regions of the elevations -3-4- and, at the same time, the elevations -3-4- are pressed to an oversize. The projection h' of the elevations -3-4-- from the basic body -5- is greater by 10% - 150% as compared with the projection h from the basic body -5- in the finally pressed state. Their side surfaces form an angle of inclination .alpha.' in the range from 90.degree. - 150.degree. with the respectively adjacent boundary surface of the basic body -5-. In the second stage, the elevations -3-4- are pressed to at least approximately the final shape, the angle of inclination .alpha.' being enlarged to a value a which lies in the range from 95.degree. - 170.degree..