The article describes alignment of structure by thickness of steel strips in the process of hot rolling is considered.
The article presents the results of research of influence of temperature and strain rate on strength characteristics and structure of 17-4 PH steel. The authors developed recommendations on treatment of hot forging of steam turbine blades of the mentioned steel and its domestic analogs.
The article describes the current methods of research of technological strength, gives description of in-house research methodology for technological strength of surfaced high-speed steel with reference to the experimental setup operation principle. The authors proposed a quantitative criterion of technological strength of welded metal.
The article notes that production of parts requires comprehensive assessment based on technological heredity in the course of its manufacturing process. As a result of implementation of the principles of surface engineering there was developed a new system of indicators, including both known and new indicators and criteria.
The articles presents approaches to extract of parts of conic form from positions of analysis of technological deformability of modern non-ferrous metals. Use of modeling on research of process of multitransitional sheet extract for products not only improves the quality of process development, but also allows to predict technology and behavior of workpiece metal before production start. For modeling finite element AUTOFORM system is used. Basic data and results of modeling are given.
Process of extrusion of a piston-type hollow parts of car brake cylinder is exposed to research. Modeling of extrusion process of parts with different bottom thickness is carried out. For modeling finite element Q-Form 2D system is used. Basic data and results of modeling are given.
The article presents the technique of research of a plane strain condition of material by stretching of a tubular sample on a chuck. Experiments are made and thickness change diagrams for stretched sample are submitted. It is shown changes of deformation of destruction depending on wall thickness of a stretched sample for materials 20H and D16.
This work experimentally verified the possibility of increasing shear properties of poly-composite materials (PCM) for reinforcement in transverse direction. To increase shear strength small tack aramid fibers were used. Flat plates of carbon fiber were manufactured by vacuum infusion of binder. Fibers of thin tack do not disrupt the structure of the PCM while sewing. Additionally use of PPTA fibers instead of PABI is economically profitable. The authors worked the technique of sewing layers of carbon fabric aramid fiber by subsequent infusion dry impregnation of the package through. It is shown that sewing increases the shear strength of high-strength layered carbon fiber.
The article discusses the approach, allowing to extend the set of central composition plans. Application of properties of a point material body allows the orthogonal planning.
The paper proposes ratios for calculation of technological parameters of isothermal bar compression. Material is considered as visco-plastic, damageable. There are used energy calculation method and method of averaging stresses. Calculated data are given.
This article presents modular principle in tool production, which allows to distribute entire range of metal cutting tools, currently used in mechanical engineering, into eight basic modules. The limited range of modules should provide a variety of different instrumental arrangements by different combinations of modules and regulations.
The article is about a small-sized experimental-industrial profile-bending machine of new design intended for further researches, production of thin-walled profiles and use in educational process. The authors proposed to create the first stand with indenters extruding service grooves in tape to reduce losses for excess deformation and friction, as well as to simplify configuration and reduce the cost of tooling.
The paper describes experimental study of axially symmetric forming method of Eriksen. The authors determined the limiting strain of multilayer elements to fracture the integrity of individual layers. During experiments authors modified contact conditions of interaction of a tool and a layer. Obtained experimental data by power parameters of process.
Technological operations of sheet-metal forming cause uneven flanging of outer and inner loops. Uneven shape of opening leads to change of flanged edge flow process. Results of studies summarized on the basis of simulation. Modeling revealed problem areas for cut form in a flanged part.