SU812425A1 - Apparatus for rolling metallic powders - Google Patents

Description

The invention relates to powder metallurgy, in particular, to devices for rolling metal powders to be used as press powder of high initial density. A device for rolling metal powders is known, including a roll of preliminary and final compaction of powders}. The disadvantages of this device include low uniformity n | rounded material. The closest to the proposed technical essence and the achieved effect is a device for rolling metal powders, including rolls of preliminary and final compaction and gland scrapers located under the pre-compaction rolls 2. The disadvantages of this device are the low uniformity of rolled pellets, due to the lack of averaging of the material after pre-compaction. The purpose of the invention is to increase the uniformity of the rolled pellets. This is achieved in that at least one of the scrapers is ribbed in the mouth, located in & and across the entire width of the scraper, while the edges of the edges facing the rolls are made at an acute angle. FIG. 1 shows a preferred embodiment of the proposed device, a general view; in fig. 2 scrapers in an enlarged view (node 1 in Fig. 1); in fig. 3 is a view A of FIG. 2 in FIG. 4 is an enlarged scale of the rib section (section BB in Fig. 2). The proposed device contains a system of rolls of pre-1 and final 2 compaction of powders, scrapers 3 located under the rolls 1, the width of the scrapers corresponds to the length of the roll, and each of the scrapers is fixed on a bracket 4 mounted rotatably on a fixed axis 5 The rolls are made with a spring 6. The ribs 7 are made across the entire width of the scrapers (at least one of them), the edges of the adjacent scrapers are set in engagement, and the faces of the 8 edges 7 are made at an acute angle. Rolls installed

in bearings (not shown) on boxes 9 and 10 with loading I and 12 and loading 13 and 14 nozzles, loading nozzle 11 is connected through a seal .15 with a loading hopper 16, and the discharge nozzle 13 through a seal 17 with a loading nozzle 1241 10. One of the pre-compaction rolls is movable to adjust the gap between them. One of the rollers of the final compaction is also installed with the movement option.

The device works as follows.

The powder from the feed hopper 16 goes through the loading nozzle 11 ao and grows (the roll of pre-compaction towards each other.

The precompacted powder comes out after the rolls 1 in the form of a compressed strip, which, meeting the ribs 7 of the scrapers on its way, 3, begins to break down into pellets. Then, as the zone bounded by the roller 1, the ribs 7 and the walls of the housing 9 is filled, the material is forced by the rotating rollers, pressed between the ribs 7, hits the rollers 2 rotating towards each other, is finally compacted and unloaded through the discharge pipe 14,

Rolled material 1 is removed by scrapers 3.

The presence of at least one of the scraper ribs located along the entire length of the scraper provides grinding and partial mixing of the material before the final compaction and thereby improves the quality of the finished press powder by increasing the degree of compaction and averaging the density throughout the volume.

Claims (2)

Invention Formula 5 A device for rolling metal powders, including pre-and final compaction rolls and gland scrapers located under pre-compaction rollers, characterized in that, in order to improve the uniformity of rolled billets, at least one of the scrapers is made with ribs arranged across the entire width scraper, while the edges of the edges facing the rolls, made at an acute angle. Sources of information taken into account in the examination 1. Patent of England hP 1390696, CL, C 7 A, published. 1972.   2. USSR author's certificate LR 187521, cl. B 30 V 11/00, 1966.