Temat: shot - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A rescue shot – resolving hostage situations in police operations
Autorzy:: Jałoszyński, Kuba
Tematy:: rescuing shot
shot on command
law; Pokaż więcej
Wydawca:: Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/1878678.pdf Link otwiera się w nowym oknie
Opis:: The issue of a rescue shot and a shot on command is a matter that presently needs a more precise legal definition. The author presents the issue, which requires a most urgent solution, while comparing it with relevant regulations in the United Kingdom, the Netherlands, Germany and Spain. Thus he provides a broad picture of possible solutions to the critical problem of a rescue shot and a shot on command.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Współczesne oczyszczarki strumieniowo-ścierne Część III. Analiza pracy turbin śrutowniczych
Contemporary shot-blasting machines. Part III. Analysis of the operation of shot-blasting turbines
Autorzy:: Woźniak, K.
Tematy:: abrasive shot-blasting machine
shot
shot blasting turbine
shot blast
oczyszczarki wirnikowe
obróbka strumieniowo-ścierna
strumień śrutu; Pokaż więcej
Wydawca:: Wydawnictwo AWART
Powiązania:: https://bibliotekanauki.pl/articles/404593.pdf Link otwiera się w nowym oknie
Opis:: This paper is the third part of a larger study presented in previous editions of the quarterly. It presents the factors that determine the efficiency of abrasive blast cleaning. The selection of the right shot-blasting machine and the correct selection of the parameters of its work, in addition to the appropriate parameters of the air circulation in the paver, guarantee the achievement of the assumed effects of abrasive shot blasting. The information presented in this part of the study enables the selection of such parameters.
W części II opracowania [10] stwierdzono, że turbina śrutownicza jest „sercem” współczesnych oczyszczarek wirnikowych. Z tego powodu wybór właściwej śrutownicy i dobre dobranie parametrów jej pracy, obok odpowiednich parametrów obiegu powietrza w oczyszczarce, jest gwarantem uzyskania założonych efektów obróbki strumieniowo-ściernej. Analiza, przedstawiona w tej części opracowania, umożliwia taki właśnie wybór.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Współczesne oczyszczarki strumieniowo-ścierne Część II. Budowa turbin śrutowniczych
Present-day abrasive jet cleaning machines. Part II. Construction of shot jet turbine
Autorzy:: Woźniak, K.
Tematy:: abrasive
shot
cleaning machine
shot jet turbin; Pokaż więcej
Wydawca:: Wydawnictwo AWART
Powiązania:: https://bibliotekanauki.pl/articles/404487.pdf Link otwiera się w nowym oknie
Opis:: Shot jet turbine are the basic component of rotor cleaning machines system. Creating of abrasive jet which machining surface stroke is determined by constructional structure of turbine throwing rotor. Operational features of abrasive jet – directly and indirectly – results of abrasive jet machining depend on rotor constructional structure and machining operational parameters. In the paper principle of turbines operating and their constructional structure. Structure of their main units and elements is described too.
Podstawowym składnikiem instalacji oczyszczarek wirnikowych są turbiny śrutownicze [14]. Za tworzenie strumienia ścierniwa, który uderza w obrabianą powierzchnię, odpowiedzialny jest wirnik rzutowy turbin. Od budowy wirnika i parametrów jego pracy bezpośrednio zależą właściwości roboczego strumienia ścierniwa, a pośrednio – efekty obróbki strumieniowo-ściernej. Poniżej przedstawiono zasadę działania turbin, ich strukturę konstrukcyjną. Opisano także budowę głównych zespołów i elementów turbin.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The numerical fem model of the kinematics of the vibratory shot peening process
Autorzy:: Bławucki, S.
Zaleski, K.
Tematy:: vibratory shot peening
FEM
vibratory shot peening kinematics
efficiency of vibratory shot peening; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102472.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of numerical calculations, with the finite element method in the ABAQUS program environment, of the vibratory shot peening process with loose peening elements. The behaviour of shot peening elements was analysed in the kinematic aspect. The impact of the initial deployment of vibratory shot peening elements on their behaviour during processing was investigated, including the displacement, velocity, acceleration and the number of collisions. The way of determining the effectiveness of the processing with the vibratory shot peening was illustrated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of Single-Stage and Duplex Shot Peening on Surface Roughness and Residual Stresses in Al Mg5 Mn1 Sc0,8 Zr0,4 Alloy
Autorzy:: Byczkowska, P.
Sawicki, J.
Januszewicz, B.
Stegliński, M.
Tematy:: shot peening
double shot peening
residual stresses
roughness; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/353741.pdf Link otwiera się w nowym oknie
Opis:: Conventional shot peening (SP) is cheap surface treatment widely used to enhance fatigue life of mechanical components [3,4]. Basically, it is shooting small particles (shots) on the surface of the sample. However, the process itself is so complex that a lot of companies are not able to optimally employ it due to the amount of parameters that must be controlled all at the same time. The duplex process consists in two stages of shot-peening treatment. The first one consist of shot-peening with spherical cast steel shots or cut wire shots. During the second stage the samples processed in stage one were subject to shot-peening with glass beads. In this work, RSA-501 aluminium alloy was shot peened using shots of different material and diameter and tested using a measurement of residual stresses and surface roughness. Tests and studies conducted so far on RSA-501 aluminium alloy demonstrate that bombardment by a treatment medium in the form of glass beads or shots of various shapes and diameters induces permanent plastic deformation of the surface layer. The roughness achieved after the shot-peening process was determined for each treatment medium. The largest value of Ra parameter was achieved for cut wire shots and this result is consistent with the above-mentioned theoretical knowledge. This medium is the most aggressive one to the surface being treated primarily due to the sharp edges of shots. The duplex process was successful in obtaining higher values of compressive stresses in surface layer than values achievable in conventional single-stage shot peening process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of the impact of double shot peening on the value of roughness parameter and distribution of stresses in the RSA 501 alloy
Autorzy:: Byczkowska, P.
Sawicki, J.
Januszewicz, B.
Stegliński, M.
Tematy:: shot peening
double shot peening
surface treatment
residual stresses
roughness; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/957816.pdf Link otwiera się w nowym oknie
Opis:: The bead blasting process is widespread in both the automotive and aerospace industry and is performed in order to improve the fatigue strength of various components. Bead blasting is a cold plastic forming process during which the surface of the material processed is hit by small, hard particles consisting of steel pellets, bearing balls or glass beads. It increases the hardness of the outer layer and establishes compression stresses inside it, which is why this processing is often used to improve fatigue strength. Contrary to other peening methods, bead blasting does not result in a reduction in the height of the processed surface’s unevenness in most cases. Shot peening changes the residual tensile stresses into residual compression stresses, thanks to which, the lifetime of the parts processed is extended and their carrying capacity is increased. The double shot peening process proposed by the authors consists in a two-stage bead blasting process. The first stage consists in blasting with round cast steel pellets, pellets cut from wire or cast iron pellets. During the second stage the same samples underwent glass bead blasting. The tests conducted on the RSA-501 aluminum alloy indicate that as a result of the processing medium’s impact in the form of glass beads or pellets of different diameter and shape, a permanent plastic deformation of the material surface occurs. On the basis of the obtained results it is possible to infer that the choice of parameters of both conventional shot peening and the double shot peening determine the impact thereof on the material’s mechanical properties. Thanks to the application of the double shot peening process there is a noticeable decrease in value of the Ra parameter, by about 40% on average. When analyzing the compressive stress results it is possible to state that after the first blasting process the value of stress was increasing when moving deeply into the sample from its surface, while after the glass bead blasting the value of compressive stress was significantly higher already near the surface. Double shot peening results in an increase in the value of compressive stresses by 40-50% when compared to conventional blasting.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Materiały ścierne stosowane we współczesnej obróbce strumieniowo-ściernej
Abrasive materials used in contemporary abrasive-jet technologies
Autorzy:: Woźniak, K.
Tematy:: abrasive jet machining
shot
shot's selectio
obróbka strumieniowo-ścierna
ścierniwo
uderzenie strumienia powietrza; Pokaż więcej
Wydawca:: Wydawnictwo AWART
Powiązania:: https://bibliotekanauki.pl/articles/404517.pdf Link otwiera się w nowym oknie
Opis:: In this paper the beginnings of abrasive-jet machining were described, diagrams of installation of the first patents for this treatment were also included. Shots as a working media in these methods were classified. Domestic and international standards, describing all media and methods of their research were discussed. Characteristics of currently used shots were given, the rules of their selection for the processing of specific metals was described.
Obróbka strumieniowo-ścierna jest powszechnie stosowaną metodą obróbki powierzchni różnorodnych przedmiotów. Zgodnie z definicja zawartą w PN-EN ISO 8504-2:2002 obróbka strumieniowo-ścierna to „uderzanie strumieniem ścierniwa, charakteryzującego się wysoką energią kinetyczną w powierzchnię, która ma być przygotowana”. Czynnikiem rzucającym ścierniwo na obrabiana powierzchnię jest sprężone powietrze, woda lub siła odśrodkowa koła rzutowego śrutownicy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Reacting of Gun Shot Residues in the Dependence on the Gun Barrel Lenght
Autorzy:: Svachouček, V.
Svachoučková, P.
Velehradský, L.
Ventura, K.
Tematy:: gun shot residues
ammunition
analysis; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358826.pdf Link otwiera się w nowym oknie
Opis:: Currently, the study of gun shot residues constitutes a wide and a very interesting problem as from the shooter´s view so as from the design enginneers´ view and furthermore possibilities, which infuence the conditions of the products formation process. Currently, one direction of the investigation of gun shot residues proceeds the study of morphology and thereby even possibilities of improvement of frm particles and further physical conditions, which infuence for instance on their stability in the surveyed environment or scatter particles. This problem is investigated by research police institutes above all. The detection of the shot place from the specifc cartridge of a concrete weapon is the objective of their investigation. The lay formation of gaseous gun shot residues and their possible toxicity is interesting from the gunner´s view. We have been dealing with this problem for 5 years. This research paper is intented the problem of the dependence of composition of gaseous gun shot residues on the gun barrel lenght.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of Shot Peening on Abrasion Wear in Real Conditions of Ni-Cu-Ausferritic Ductile Iron
Autorzy:: Wieczorek, A. N.
Tematy:: ADI
shot peening
wear
abrasion; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/350866.pdf Link otwiera się w nowym oknie
Opis:: The paper presents results of the wear tests of chain wheels made of austempered ductile iron with various content of residual austenite. The aim of this study was to demonstrate the impact of the dynamic surface treatment (shot peening) on wear properties of surface layers of the chain wheels tested that were subjected to the action of quartz abrasive. Apart from determining the value of the abrasive wear, examinations of the magnetic phase content in the microstructure were carried out and plots of hardness of the surface layer as a function of the distance from the surface and microstructure of the materials were prepared. Based on the results, the following was found: an increase in the abrasive wear and a reduction in the hardness of the surface layer of chain wheels subjected to shot peening, as well as reduction of susceptibility to negative action of the shot for cast irons with the structure of upper ausferrite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Parameters selection of shot peening gears of carburized and hardened steel 21NiCrMo2
Autorzy:: Tchórz, T.
Śnieżek, L.
Grzelak, K.
Mierzyński, J.
Tematy:: materials engineering
shot peening
vehicles
gears; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245218.pdf Link otwiera się w nowym oknie
Opis:: This article presents the methodology of shot peening gears’ parameters selection used in agricultural tractor transmission. The gears made of steel have been treated with 21NiCrMo2 thermal-chemical consisting of carburization to the depth of 0.8 mm and subsequently hardened. The hardness of the side teeth surface after hardening was 58 HRC. The same process of thermo chemical was used for flat samples with dimensions 120×12×5 mm. Prepared samples were divided into two series. First shot peening was treated with spherical pellet with a varied diameter from 0.4 mm to 2.5 mm. For second series samples additional treatment of shot peening was not carried out. Then micro-hardness, roughness and longitudinal and transverse residual stresses were measured. As a result of the studies, there were selected parameters of shot peening, exerting the greatest influence on favourable residual stresses distribution in the surface layer of material and an increase in microhardness. At the same time, particular attention was paid to the morphology of samples surfaces after shot peening. There were rejected the parameters of shot peening, which caused damage to the surface in the form of visible cracks and craters. Based on the analysis presented in this article there were selected shot peening parameters, which will be applied during the additional dynamic surface processing of gears, used in the tractor’s drive system.
Dostawca treści:: Biblioteka Nauki

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