Metalloobrabotka № 5 (95)/2016

Khanov A., Sirotenko L., Trofimov E., Matygullina

E., Shingel L. Roughen of the Internal rubber coating of long pipes with variable diameter

The conditions for determining the contact constant force of the abrasive wheel to roughening treated surface with thin rubber coatings applied to lengthy cylindrical items with varying diameter along their length are offered. Analysed changes in the working conditions of a single grain abrasive wheel with an increase in the diameter of the treated area. It is shown that the processing of rubber shear stress in the contact area of a single grain coating can not exceed the value at which begins the formation of cracks in the surface coating. The definition of a permanent clamping force range of abrasive invited to carry out on the basis of processing conditions on the site with a minimum diameter, and taking into ac- count the fact that the thickness of the release layer in the transition areas to products with different diameters will be reduced in inverse proportion to the diameter of the treated surface area.

Keywords: roughening, rubber coating, clamping force, long pipes, a variable diameter, cutting thickness.

Khanov A. M., Sirotenko L. D., Losev V. A., Trofimov A. O. Mechanico-hydro-electrical model of the chip formation process for turning operations

Mechanico-hydro-electrical model of the chip formation process for turning operations is presented also stages for designing the model and base of the methods are presented. In this study a mechanisms of the affect of cut- ting parameters to cutting edge process quality. The main parameter of the cutting edge process for estimation of a cutting process is a chip formation process. Also solution of a test-problem with certain start parameters and conditions for estimation of functionality of the method is presented. Oscillation diagrams for cutting force and speed, received by solving the test-problem via MathCAD, are presented.

Keywords: process dynamics, chip formation process, cutting edge machining, mathematical simulating, direct analogy, equivalent element, numerical mathematical model, electrical circuit, mechanic-hydro-electrical model;

Oglezneva S. A., Khanov A. M., Ogleznev N. D. Rese- arch on relative erosion resistance Electrode -tools of composite powder materials based on copper

The aim of research was to study the physical, mechanical and performance properties of the electrode-tool made of composite materials based on copper with the addition of tungsten, molybdenum, chromium by the EDM piercing tool steel. Composite materials based on copper with a different content of refractory phases were manufactured by powder metallurgy. It is found that increasing the concentration of the refractory metal 25 to 80 vol. % Increases the hardness and strength of composite materials, and electrical resistivity. When insertion tool steel for roughing modes found that erosive wear of the electrode

«copper-chromium» because of the higher heat resistance

of chromium significantly less than the wear of the well

known and commercially available instrument systems electrodes „tungsten-copper” and „copper-molybdenum”.

Keywords: EDM, the electrode-tool, a composite mate- rial, copper, refractory metal, strength, hardness, electrical resistance, erosion resistance

Chumanov I. V., Anikeev A. N., Ablyaz T. R., Amoso va Yu. E. Investigation of the microstructure dispersion- strengthened centrifugally cast castings subjected to plastic deformation

A method for producing dispersion-strengthened metallic materials by a centrifugal casting process with the introduction of particulate casting followed by plastic deformation (forging). The distribution dispersion-rein- forcing particles in the amount of centrifugal-cast billets after their plastic deformation.

Keywords: centrifugal casting, plastic deformation, tungsten carbide, silicon carbide particulate reinforcement, microstructure.

Gilev V. G., Torsunov M. F., Morozov E. A. Laser al loying of cast iron Ni-Resist CHN16D7GH at Ti powder injection into the melting zone

Results of research of a microstructure and microhardness of Ni-rezist cast iron after a laser melt injection are given. Processing carried out the fiber laser a beam focused to a spot with a diameter of 0,2 mm at the power of laser radiation of 1 kw and at the speed of movement of laser beam 10–40 mm/sec. Titanium in the process is dissolved in the iron melt, and when cooled form particles TiC. The utilization factor of the titanium powder is increased by increasing the size of the melting zone and reaches at most a value of 50 %. The size of the melting zone increases with decreasing speed of laser beam movement on the surface of the sample. The modified layer is a composite structure with a metal matrix and a relatively uniform distribution of the particles of titanium car- bide. Microhardness modified zone reaches 600–700 HV. Further increasing microhardness hampered by the fact that the carbon in the laser melting process is removed from the melt zone. A maps of element distribution in laser alloying zone (LAZ) are given. In all experiments LAZ bundle on 2 layers is observed. The top layer have

34–37 % titanium and a bottom layer have 16–20 % titanium.

Keywords: laser melt injection, austenitic cast iron, Ni-rezist cast iron, titanium carbide, microstructure, mi crohardness, maps of element distribution.

Chumanov I. V., Anikeev A. N., Ablyaz T. R. Increasing the technological characteristics of the various parts by dispersion hardening of titanium carbide

The object of the research is dispersed hardening of the various parts of titanium carbide particles by the introduction of particles in a polystyrene model. As reinforcing components were chosen mixer blades rigid concrete mixes and the crown of the tooth excavators. Both parts operatein conditions of increased wear, which leads to the need to increase their abrasive wear resistance. Experiments to obtain reinforced parts, presented a study of macro- and microstructure, and also conducted research on the abrasive products in wear resistance obtained samples in the laboratory and under actual production conditions.

Keywords: Titanium carbide, particulate reinforce ment, abrasion resistance, microstructure, paddle mixer, the crown of the tooth.

Karavaev D., Matygullina E. Study on tribological characteristics of composite materials to perspectives of reduce the cost of metalworking ball valves, operating at temperatures above 200 °C

The results of tribological tests of composite mate rials modified silicone resin — expanded graphite (EG), operating at temperatures above 200 °C. The influence of the structural characteristics of the EG on the coefficient of friction and wear of composite materials. It is shown that the use of ball valves with saddle seals made of composite material on the basis of EG, it allows to extend operating temperature range of ball valves on a «metal- to-polymer» to 550 °C, and significantly reduce the cost of the finished product.

Keywords: close fitting valve, ball tap, composite material, expanded graphite, polymer, friction, wear, tribological properties, friction coefficient.

Kobityansky A. E., Shafranov A. V., Beloborodov V. S. Calculation of dynamic characteristics of batching system Proposed calculation schemes volume liquid dispensing systems, taking into account the dynamic interrelation of their elements as a single electrohydromechanical system. Provide basic requirements and criteria of quality of functioning of such systems. Provide basic scheme of the functioning of the dosing systems. Taken generalized mathematical model describing the batching systems with different types of executive body of the drive. Numerical realization of simulation performed using the software package in Matlab system Runge-Kutta 4 and 5 of the or- der. Is given number of results of calculation of basic and dynamic characteristics are graphic illustrations, in particular, for the slider-crank drive of the executive body.

Keywords: dosing system, dosing, mathematical model, simulation modeling

Pustovalov D. O., Labutin V. N., Belova S. A., Bogo myagkov A. V., Sharov K. V. Design of manufacturing gating systems for grinding bodies in sand-clay molds

The paper are presents: the results of the analysis of the proposed alloy wear for the manufacture of grinding media; the impact of the chemical composition of the alloy at the liquidus temperature and the solidus tempera-

ture; calculation of the density of iron selected brand in

the solid and liquid states; developed versions of gating systems for grinding bodies in sand-clay forms; the results of simulation of filling out forms in for producing defect-free castings with high technological yield.

Keywords: grinding bodies, wear resistance, liquidus temperature, solidus temperature, density, casting shrink- age, gating system, sand molds.

Sirotenko L. D., Shumkov A. A., Trapeznikov N. V., Kilina P. N. Modeling of the process of removal of burnt molding SLA model

The results of the simulation model of thermal removal of the polymer obtained through SLA - technology. Identified stress and strain occurring during thermal loading model with different volumetric content material. The possibility of reducing the stress between the ceramic shell and the refractory model of photopolymer material, which is a thin-walled cylindrical shell filled with mono- lithic material with adjustable porous honeycomb structure. It is found that patterns made from solid material, completely filling the internal cavity of the ceramic shell does not allow to exclude cracking of ceramic shell molds in step burning material models.

Keywords: stereolithography, polymer model, burning, finite element method, crack

Labuti V. N., Belova S. A., Bogomyagkov A. V., Pustovalov D. O., Sharov K. V. Determination of cooling times of large shaped steel alloy castings having the form of bodies of rotation

The article presents the calculation of the cooling time of the shaped casting, having the shape of rotation through its reduction to an equivalent casting in the form of a flat plate. It is proposed the design formula for determining the cooling time of the casting since the casting before shakeout from the mold. Produced the meaning given thickness R is equivalent to castings for various geometrical relations of the equivalent plate. Determined the cooling time of castings with closed profits to various shake-out temperatures. According to the results of the calculations of the nomogram constructed, allowing to determine the time of cooling to a temperature of knockout, using their calculated given the dimensions and the coefficients a and K, taking into account the temperature of the shakeout and the impact of open risers, respectively. The example of calculation of concrete casting through casting it into an equivalent casting in the form of a flat plate. The calculation methodology greatly simplifies the calculations and reduces the time dedicated to them.

Keywords: form, factor Bio, pouring temperature, liquidus, solidus, equivalent to the casting, the law of

«square root», the profit of given thickness, the effective heat of crystallization, density, size, thickness, weight.