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24.12.2020

Поступил из типографии тираж 2-го издания книги И.А. Ивановой "Погостье". Жаркая зима 1941/42 г.

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11.11.2020

В год 75-летия Великой Победы издательством «Политехника» готовится к выходу в свет книга «Погостье. Жаркая зима 1941/42 гг.» − сборник воспоминаний ветеранов 54-й армии и жителей прифронтовой полосы.

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XV Санкт-Петербургский международный книжный салон

В связи с неблагополучной ситуацией по распространению новой коронавирусной инфекции (COVID-19) все офлайн книжные мероприятия, запланированные к проведению в 2020 году при поддержке Комитета по печати и взаимодействию со средствами массовой информации, отменены. 

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14.10.2020

Более 70 предприятий из восьми стран примут участие в промышленной онлайн-выставке TeMEx

14 октября 2020 г. начнет работу промышленная онлайн-выставка TeMEx. Она объединит на одной площадке более семидесяти компаний из восьми стран мира, которые представят посетителям новинки широкого тематического спектра – от крупногабаритных машин и сырья для промышленности до научно-технических разработок, IT-решений и средств автоматизации производства.

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06.10.2020

C 18 по 20 ноября 2020 года в конгрессно-выставочном центре «Экспофорум» пройдет «Петербургский международный форум здоровья» («ПМФЗ 2020»).

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25.09.2020

 14 октября 2020 г. в 11.00 пройдет вебинар «Термическое оборудование и технологии для современного производства».

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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.