Evsyukov

pp. 107-123

In this paper the authors consider a design technique of a two-step manufacturing process of a bell-shaped detail with the use of overlapping of operations at one step. Those operations were drawing, pressing and expanding. Dependences for determination of the work-piece dimensions of the first step of drawing which are the diameter and thickness of a round work-piece, were presented in this article. The authors give recommendations on determining dimensions of a cylindrical cup produced at the first step of drawing, namely the diameter and height of a cylindrical cup along with the maximum and minimum wall thicknesses. An example of production engineering of a sheet-metal stamping for manufacturing a specific bell-shaped detail, using an overlapping of operations mentioned above. Results of experimental verification of the manufacturing process developed according to the proposed method were also presented in this paper.

The authors consider extracting combined with swaging and distribution as a method to intensify the processes of sheet metal forming allowing to produce a conical workpiece which has a funnel-shaped opening with a large coefficient of deformation for one technological transfer in one molding tool. During the study of extracting combined with swaging and distribution computer modeling AutoForm software was used. The authors consider influence of friction on the process of forming; they evaluated changes in thickness of the funnel-shaped opening and in deformation forces with different values of friction coefficient. The authors also considered the effect of distribution on force parameters of the combined extracting and final dimensions of the product.

 The authors investigate the influence of correlation coefficients of drawing and flanging on stability of the combined process of obtaining profile rings with double walls. Finite element method is used. To assess the stability, wall height is recorded. It was determined that when drawing and flanging coefficients change there is a critical ratio of the coefficients at which the process loses stability. Relative thickness of a work piece has a determining influence on stability. Application range of this combined process expands with the increase in relative thickness, with the decrease in the punch radius of curvature and with the use of stainless steel.

Results of the research of material VT3-1 in connection with the systematic acquisition for understated plastic properties of forgings after hardening heat treatment are presented. Formation of the microstructure of titanium alloy VT3-1 subjected to plastic deformation depending on the strain rate conditions is considered. It is shown that the nature of the structure of titanium alloys is formed during deformation and cannot be corrected by heat treatment. Along with strain and temperature strain rate has great influence on getting the desired microstructure of the alloy.