Manufacturing Technology Journal, 2011 (vol. 11), issue 1
The Kaizen philosophy in the aluminium products improvement
Borkowski Stanisław, Stasiak-Betlejewska Renata, Náprstková Nataša
Manufacturing Technology 2011, 11(1):2-5 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/2 
Kaizen strategy is the most important Japanese management concept. Supporters of this by all means an interesting management philosophy consider it as a basis for achieving success by the company. The analyzed company X Stainless motivated by others companies market successes decided to deepen the knowledge of the Kaizen philosophy, which resulted in the implementation of this method of management in its ranks. The essence of Kaizen is to change ways of thinking and way of production management. Underlying this theory, there is the gradual but constant improvement of the status quo with the active involvement of every management employee and the rest...
Fatigue life and surface integrity measurements of EN S355J2 steel used in hydraulic components
Čuban Jiří, Calonius Olof, Pietola Matti, Jersák Jan
Manufacturing Technology 2011, 11(1):5-11 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/5
This article is aimed at studying the impact of surface integrity - surface roughness, hardness and residual stress - on fatigue performance of EN S355J2 steel. The test specimens were manufactured by turning. A longer fatigue life for the machined components can be obtained by applying such cutting conditions as a low feed rate. The fatigue limit of the specimen with the surface roughness Ra 1,6 μm is approximately 7 % higher than that of the specimen with Ra 3,2 μm. From the residual stress results it can be seen that the cutting conditions used for producing surface finish Ra 1,6 μm will introduce mainly compressive residual stress...
Phase and structure characteristics of recycled AlZn10Si8Mg cast alloy
Ďuriníková Emília, Tillová Eva, Chalupová Mária
Manufacturing Technology 2011, 11(1):11-17 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/11
The contribution describes effect of the temperature (20-400°C) on structure and mechanical properties (Brinell hardness and bending impact toughness) of the recycled AlZn10Si8Mg cast alloy. AlZn10Si8Mg cast alloy are used for engine and vehicle constructions, hydraulic unit and mould making without heat treatment. Improved mechanical properties are strongly dependent upon the morphologies, type and distribution of the phases, which are in turn a function of alloy composition and cooling rate. A combination different analytical techniques (light microscopy upon black-white and colour etching, scanning electron microscopy (SEM) upon deep etching, energy...
Analysis of influence of structure on mechanical properties of AlSiMg aluminium alloy processed by ECAP
Greger Miroslav, Widomská Milena
Manufacturing Technology 2011, 11(1):17-22 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/17
Microstructure and texture development of an AlSiMg alloy during equal channel angular pressing (ECAP) was investigated and correlated with the mechanical properties. The micro-structure was effectively refined by ECAP, and the original fibre texture of the extruded aluminium alloy was disintegrated and a new texture was gradually developed by repetitive ECAP pressing. After 6 ECAP passes following the route Bc, the yield stress was lower than that of the as-extruded aluminium alloy, indicating that the texture softening was dominant over the strengthening due to grain refinement. Cross-section of original samples was φ 12 mm and their length...
Cavitation erosion resistance of the chosen aluminum alloys
Jasionowski Robert, Podrez-Radziszewska Marzena, Zasada Dariusz
Manufacturing Technology 2011, 11(1):22-28 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/22
The cavitation erosion is a process of material deterioration as a result of materialization, increase and decrease of the cavitation bubbles in different types of liquid. The cavitation erosion materials are used to prevent the devastating effect of imploding bubbles. The aluminum alloys are often used on the parts of machines exposed to cavitation erosion phenomenon. The following article brings up the study of the results of investigation cavitation erosion resistance aluminum alloys: EN AW-2017A, EN AW-5754 and EN AW-7075.
Application of magnetic correlation analysis on the choice and correction of cutting parameters for automated manufacturing systems
Kocman Karel
Manufacturing Technology 2011, 11(1):28-32 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/28
The paper is focused on the optimization of cutting parameters and their correction using magnetic correlation kinetic analysis to determine the workability of the material machined. The integrity of the surface layers, dimension and shape accuracy and cost of production is primarily dependent on the input parameters of the cutting process with particular workpiece material and its workability, the required quality, working conditions, type of cutting tool, workpiece material and machine tool. Different homogeneity causing uneven machinability, its early detection and quantitative assessment before entering into the semi-machining process is an important...
Alternative machining procedures of hardened steels
Kundrák János
Manufacturing Technology 2011, 11(1):32-39 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/32
This paper outlines the hard machining procedures, their applicability, the increase of their efficiency and the possibilities provided through their combination. It focuses on the advantages of the cutting and grinding compared to each other and also on the cases when it is appropriate to apply them or possibly combine them.
Microstructure and Mechanical Properties of the AlSi13Mg1CuNi Alloy With Ecological Modifier
Lipiński Tomasz
Manufacturing Technology 2011, 11(1):40-44 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/40
A homogenous modifier obtained by the rapid solidification at a cooling rate equal to v=200 K/s was applied to the modification of the AlSi13Mg1CuNi alloy. The different modifiers were obtained by means of the Al-Si alloys containing 0, 7 and 12 at. % Si, respectively. The components Al, Al-7Si, Al-12Si were put into crucible containing the liquid AlSi13Mg1CuNi alloy. Both, effect of cooling rate applied to obtain modifier and weight in weight modifier concentration in the melt on microstructure, tensile strength and hardness of AlSi13Mg1CuNi alloy are determined. A structural, physical and mechanical properties resulting from the AlSi13Mg1CuNi alloy...
Use Properties of the AlSi9Mg Alloy With Exothermical Modifier
Lipiński Tomasz
Manufacturing Technology 2011, 11(1):44-49 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/44
The improvement in mechanical properties generally has been attributed of the morphology and size of the α- and β-phase. Chemical elements and compounds, both added to the alloy and formed as a result of exothermic reactions, "pass" into the alloy, changing the course of its crystallization. Selection of the mixture components allows - to a degree - to decide about the starting moment of crystallization and change the range of solidification of alloy or its individual phases. Control over crystallization by acceleration or deceleration of the equilibrium process enables to affect the alloy structure. Another advantage may be addition of...
Unconventional machining method for enhancing the durability of tools and strength of the specimens bonded
Makedonski Aleksandar
Manufacturing Technology 2011, 11(1):49-55 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/49
The article presents the results from the application of a new method for raising the exploitation characteristics of metal-cutting tools, which includes preliminary combined magnetic field and ultrasound processing of the instrument. The indirect effect of the processing on the cutting force as well as on the roughness of the processed surface and on the wearing of the instruments during the drilling and milling processes has been studied. Demonstrated the effectiveness of the method on shear strength of the metal samples bonded
Surface quality of hardened steels after grinding
Novák Martin
Manufacturing Technology 2011, 11(1):55-59 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/55
Problems about hardened steels grinding is presently very important part of engineering. Many applications of these materials using in practice, machine, devices and in different industry like automotive, aviation, cosmonautics and in area of health, safety and protection of passengers in vehicles, planes, aircrafts, ships, trains and many others. Because of these areas that used the passengers is very important surface quality and durability of these parts of machines. Topic of surface quality changes in working of the parts is especially important in dynamic load parts. These parts are very loaded by alternating stress in cases of double axis stress...
Weldability problems of the technical AW7020 alloy
Podrez-Radziszewska Marzena
Manufacturing Technology 2011, 11(1):59-66 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/59
The article presents problems related to welding alloys of the 7000 series at an example of the AW 7020 grade alloy, by relating the obtained properties to their microstructure. Welded joints were performed with use of the weld metals according to the PN-EN ISO 18273:2007 Standard. The welded joints were subjected to evaluation of their modifiability by heat treatment.
The impact of the cast-iron semi-finished product hardness on the surface quality after the machining process
Suchánek David, Dušák Karel
Manufacturing Technology 2011, 11(1):66-70 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/66
This paper deals with the assessment of the impact of the semi-finished product hardness and the cutting conditions of machining process on the surface roughness of the workpiece after machining. The paper shows that the hardness of the material machined layer and also its inhomogeneity have an impact on the resultant quality of the machined surface. The appreciable impact on the surface quality has also the cutting conditions size affecting at the same time the machining temperature. The machining process took place in the company WIKOV MGI J.S.B. in Hronov on the machine Hedelius BC 100 with the face-milling cutter that was attached with the replaceable...
Quality control of microstructure in recycled Al-Si cast alloys
Tillová Eva, Chalupová Mária, Hurtalová Lenka, Ďuriníková Emília
Manufacturing Technology 2011, 11(1):70-76 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/70
Using recycled aluminium cast alloys is profitable in many aspects. Secondary aluminium produced from recycled metal requires only 2.8 kWh/kg of metal produced and creates only about 5 % as much CO2 as by primary production. Improved mechanical properties of recycled (secondary) hypoeutectic Al-Si cast alloys are strongly dependent upon the distribution and the shape of the silicon particles; the morphology, type and distribution of the second phases, which are in turn a function of alloy composition and cooling rate. The presence of additional elements as Mg, Mn, Fe, or Cu allows many complex intermetallic phases to form, which make characterisation...
Identification of "natural" breaker cut during the machining of carbon steels
Vasilko Karol
Manufacturing Technology 2011, 11(1):77-84 | DOI: 10.21062/ujep/x.2011/a/1213-2489/MT/11/1/77
Tool wear is generally considered a negative fact, which worsens machining results. According to theories it causes the growth of cutting forces, cutting temperature worsens the quality of machined surface. Closer study of the process of the wear leads to the need to distinguish between the effects of the wear on the back and on the face of the tool. The paper deals with the study of the mechanism of wear on the face in time relation. It shows that the groove on the face, which is created by leaving chip, can have positive aspect. It can be used as "natural chip shaper".