Process for producing a molding
The invention relates to a process for producing a molding, comprising a disk-like or plate-like basic body -- having a large number of knob-like and/or web-like elevations --- which merge into the basic body -- with inclined side surfaces, by means of pressing and sintering powdery raw materials cl...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention relates to a process for producing a molding, comprising a disk-like or plate-like basic body -- having a large number of knob-like and/or web-like elevations --- which merge into the basic body -- 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 -- are pressed to at least the approximate final shape as far as the transition regions of the elevations --- and, at the same time, the elevations --- are pressed to an oversize. The projection h′ of the elevations --- from the basic body -- is greater by 10%-150% as compared with the projection h from the basic body -- in the finally pressed state. Their side surfaces form an angle of inclination α′ in the range from 90°-150° with the respectively adjacent boundary surface of the basic body --. In the second stage, the elevations --- are pressed to at least approximately the final shape, the angle of inclination α′ being enlarged to a value α which lies in the range from 95°-170°. |
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