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粉末冶金零件的尺寸和几何形状精度主要由模具来保证。粉末冶金压模与冷冲模等有所不同,模腔不仅要承受一定的冲击力,而且模壁还要承受径向张力。模腔高度一般是产品高度的2.5～3倍,属于穿孔深腔模。模腔制造精度要比产品精度提高2～3级。模腔壁部不论是在粉末压缩时,还是将成型的制件脱出模腔时,都要与粉末或制件发生剧烈摩擦,引起模壁磨损。特别压制异型复杂、高度较高的压件,一般在生产四小时以
Powder metallurgy parts size and geometry accuracy is mainly guaranteed by the mold. Powder metallurgy die and cold die are different, the cavity not only to withstand some impact, and die wall but also to bear the radial tension. The height of the cavity is generally 2.5 to 3 times the height of the product, which belongs to the perforated deep cavity mode. Cavity manufacturing accuracy than the product accuracy increased by 2 to 3 levels. Mold cavity wall either in the powder compression, or the molded parts out of the cavity, all have severe friction with the powder or parts, causing mold wall wear. In particular, the suppression of heterotypic complex, high pressure parts, usually in the production of four hours