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УДК 621. 983



Kaliuzhnyi A.

The National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine


THE ANALYSIS OF BLOCK PRESSING PROCESS OF THE CYLINDER NECKS ON TUBULAR PREFORMS IN A SPHERICAL MATRIX WITH A DIFFERENTIATED BACKPRESSURE

Abstract. The method of obtaining of cylinder necks by block pressing with the backpressure on an internal surface of preform is presented. The finite element method carries out the calculated analysis of traditional block pressing and block pressing with a backpressure of cylinder necks on tubular preforms in a spherical matrix. Finite shapes of products are defined at traditional block pressing and block pressing with a backpressure. The backpressure usage eliminates fracture of the preform metal at a deforming and heightening of cylinder necks. Force conditions of the preforms forming, the stress-strain state of metal and exact sizes of cylinder necks are calculated. Backpressure operation leads to heightening of intensity of strains and a reinforcement of metal after block pressing. The aforesaid ensures reliability of a screw joint of the block pressed articles with other details. The further explorations of block pressing with a backpressure are necessary to lead in a direction of obtaining of cylinder necks on the hollow articles with a bottom, and also determinations of effect of width of a wall of preform on cylinder necks forming.


Keywords: block pressing, spherical matrix, differentiated backpressure, finite element method



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