A. V. Razinkin

ON THE POSSIBILITY OF REDUCING THE DEPTH OF A SHRINKAGE CAVITY IN SINGLE-CHANNEL PRESSING OF AV (1340) ALUMINUM ALLOY RODS BY MEANS OF PRESS-WASHERS OF NEW DESIGN

Hot pressing is the most common method of forming aluminum alloys. Although the technological process of pressing aluminum alloys has long been well studied, it is still not possible to obtain a uniform deformation over the entire cross-section of the pressed workpieces. Uneven deformation during pressing is primarily reflected in the micro- and macrostructures of pressed products. Observation of the macrostructure through the cross-section and length in different parts of pressed products allows us to note a number of features that are only characteristic of pressed products. The front end of the pressed product in the middle of the section reveals a coarse-grained structure characteristic of a cast alloy. In all alloys, this cast structure is observed only on a small length of its front part, not exceeding 1.5–2 cross-section diameters. Further, the structure of most metals and alloys is uniform. Products made of aluminum-based alloys are characterized by the formation of a coarse-crystalline rim on the periphery of the cross section. The thickness of the rim increases towards the rear of the pressed product. Some pressed products with a coarse-grained structure are sent for remelting. This inevitably decreases the yield and increases the product cost. In this regard, the issue of reducing the length of cropped process waste is relevant.

The work on the use of process waste from the extrusion department at the Kamensk-Uralsky Metallurgical Works JSC has been underway for several years. The involvement of output ends in production has been successfully implemented. It has not been possible to reduce the shrinkage ends significantly despite the experimental work and theoretical calculations. This paper studies the possibility of reducing the length of cropped process waste from extrusions (shrinkage ends) due to using specially designed press-washers when pressing into a single-channel die by the direct method of metal flow without lubrication. New designs of press-washers are proposed. The efficiency of using the proposed designs of press-washers is substantiated empirically under the production conditions of the KUMW JSC.

Acknowledgment: PJSC "KUMZ", Kamensk-Uralsky, st. Zavodskaya, 5

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