Development of technological basis of 3D printing with highly filled metal-poly-dimensional compositions for manufacture of metal products of complex shape

This article discusses the possibilities of obtaining “green” parts by the FDM (Fused deposition modeling) method from ready-made polymer-metal compositions used in the MIM (Metal Injection Molding) technology and the technology of obtaining functional metal products of complex shape and structure. The influence of technological parameters of 3D printing on the quality of parts (presence of defects) obtained by highly filled polymers has been established. Thermogravimetric analysis was carried out to determine the melting point without changing the composition of the material. A filament was fabricated from granular feedstock material catamold 316L using the FDM technique

Extruding aluminum bars on a new structure radial shear mill

In this work the stress-strain state (SSS) billet made by an aluminum 7075 alloy were investigated during combined rolling-extrusion on a radial shear mill (RSM) of a new design. The billet was first rolled in smooth or helical rolls and then extruded through the matrix channel. The main regularities of the SSS distribution and the combined process of the blank temperature have been established by using the finite element method and MSC.SuperForge program. The influence of rolling modes in smooth or helical rolls and further extrusion in a matrix on the formation of rods structures were analyzed. It was found that, a fine-grained structure was formed along the section of the manufactured bars, which increases the quality of metal products

Simulation modeling of the combined pressing technology of high-quality rods

The structural changes and ultimate plasticity of L63 brass which were studied on STD 812 plastometer is described at this work. It was determined that the deformation of samples by torsion and tensile torsion leads to the formation on a L63 brass of a relatively fine-grained structure with grinding of coarse particles especially coarse particles of the β’-phase. It is shown that L63 brass has the maximum value of plasticity in the temperature range of 650 - 850 °C. The results analysis of computer modeling of the billet stress-strain state (SSS) when pressing the bars on a radialshift mill (RSM) of a new construction are presented. Rational modes of deformation of billets on a new RSM are determined in the article, which make it possible to obtain rods and wires with a fine-grained structure

New-design radial-shear rolling mill (RSRM) automation

The article deals with a new-design radial-shear rolling mill combined with pressing function. Finite element methods and MSC.SuperForge SW were used to generate quantitative data and establish basic patterns of strain-stress state (SSS) and temperature distribution during workpieces rolling-pressing in helical rollers. Formulas were derived by theoretical data approximation to allow a highly accurate determination of the SSS and temperature distribution pattern in the deformed workpiece. An equation-based mathematical model for the RSRM operation is proposed. The RSRM operation mathematical model is implemented in WinCC 7.0 and Step 7 SW using FBD and SCL PL. Sensor- derived data allow to automatically adjust the process modes of manufacture of bars and wires while avoiding any production defects

Modeling of stress-deformed conditions of heavy loaded elements of new equipment of metal injection molding technologies

For the production of Metal Injection Molding (MIM) with the technology of long profiles, a pressing device and a multi-roll mill of a new design are proposed. The analysis of the results of mathematical modeling of the stress-strain state (SSS) of heavily loaded elements of new equipment for powder metallurgy using the finite element method and the deformation model of metal strength is presented. The influence of changes in the content of the binder of metal powders obtained in the screw assembly, as well as the size of the initial powder, on the stress-strain state of the heavily loaded elements of the pressing device and the multi-roll mill, respectively, was determined

Study of the deformation state during the pulling of the workpiece in a special die

The article presents the results of a study of the deformation state when pulling a metal workpiece in a special die, preventing unidirectional metal flow in the longitudinal direction. The study of the deformation state and the construction of fields of moving during pulling of workpieces in a special die was carried out using variational methods, as well as mathematical modeling. The results of the studies on variational methods and mathematical modeling showed that the values of shear deformations in the central zone of deformation focus are respectively within 0,081 – 0,1226 and 0,085 – 0,175, which in turn proves the possibility of obtaining long-term metal workpieces with increased physical and mechanical properties in the die