Wyniki 1-7 spośród 7 dla zapytania: authorDesc:"VIKTOR TITTEL"

The influence of the surface defects concerning upsetting and extrusion processes of the micro-alloyed steel

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this paper investigates behaviour of bolts’ defects (cracks) of varying magnitude that may occur in bolt production processes (compression, upsetting). the objective has been to determine whether surface micro-cracks in the bolt semi-products can be a source of macro-cracks that might occur during the further processing stages leading to a serious damage of the material utilised [1]. Principal attention was paid to determining of the extreme limit deformation as a result of the upsetting and compression stages of the bolt semiproduct forming; at which point propagation of cracks - causing the material brittleness - may start. note that it concerns production of high-strength bolts for automobile industries that demand extreme strength and finest surface qualities of components u[...]

The analysis of production technology and material properties of chassis part from high strenght steel

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The technology of forming has very significant role in parts production for automotive industry. Recently the main aim of automobile producers is decreasing the car weight. This is realized by using of new materials and new design solutions. Therefore high strength steels are used for production of main parts as chassis parts. The aim of this paper is analysis of material and technology of chassis part production from high strength steel made by blanking, drawing and bending. Technologia kształtowania odgrywa znaczącą rolę w produkcji elementów dla przemysłu motoryzacyjnego. W ostatnim czasie głównym celem producentów pojazdów stała się redukcja masy pojazdów. Cel ten jest realizowany poprzez wykorzystanie nowych materiałów i nowych rozwiązań konstrukcyjnych. Dlatego do produkcji odp[...]

Evaluation of drawing dies wear


  The experiments with pressure drawing dies were carried out on the industrial straight line continuous drawing machine. The steel wires of 2.1 mm in diameter and carbon content of 0.85÷0.87 % were drawn from the wire rod of 5.5 mm in diameter, initially subjected to surface tre- atment with borax. The hydrodynamic lubrication was used to increase production effectiveness, improve wire quality and decrease a number of defective products. As a result of the experiment, the wire were achieved with the diameter and the ovality within the required tolerance and the improved surface quality. Moreover, drawing dies wear was observed. The moment of the dies wear was expressed by a dependence of the drawn wire surface roughness on the drawing process duration. It was found out that when hydrodynamic lubrication was used, dies consumption decreased 4.5 times in comparison to consumption of standard dies. Przeprowadzono eksperymenty ciągnienia drutów stalowych o średnicy 2,1 mm i zawartości węgla 0,85÷0,87% z walcówki o średnicy 5,5 mm poddanej wstępnie obróbce powierzchniowej (boraksowaniu). Próby wykonano na przemysłowej ciągarce liniowej z wykorzystaniem ciągadeł ciśnieniowych. Smarowanie hydrodynamiczne zastosowano w celu poprawy efektywności procesu produkcyjnego, poprawy jakości drutu i zmniejszenia ilości wybraków. W wyniku eksperymentu uzyskano drut o średnicy i owalizacji mieszczących się w granicach tolerancji oraz o podwyższonej jakości powierzchni. Przeanalizowano również zużywanie się ciągadeł. Moment zużycia się narzędzi wyrażono zależnością chropowatości powierzchni drutu od czasu trwania procesu ciągnienia. Próby wykazały, że podczas ciągnienia z hydromechanicznym smarowaniem zużycie narzędzi jest 4,5 razy mniejsze niż zużycie ciągadeł konwencjonalnych. Key words: wire drawing, dies consumption, hydrodynamic lubrication, straight-line drawing machine, surface roughness Słowa kluczowe: ciągnienie drutu, zużycie narzędzi, smarowanie hydro[...]

Properties of hot-rolled strip made of 20GYuT steel and their evaluation


  The paper presents a qualimetrical method for quality assessment of hot-rolled 20GYuT steel strips, 5 to 8 mm thick, made from continuous cast slabs. The mechanical properties such as ultimate tensile strength, yield strength, elongation and hardness (HRB) were taken into account as the indicators of quality. Weighting factors were distributed evenly between the indicators and a complex quality indicator were calculated for every strip thickness. It was found out that quality of hot-rolled strip corresponds to a level “good" on the empirical scale of quality. There were no significant differences in quality of strips with different thicknesses. W artykule przedstawiono kwalimetryczną metodę oceny jakości walcowanej na gorąco taśmy o grubości od 5 do 8 mm z odlewanych w sposób ciągły wlewków płaskich ze stali 20GYuT. Właściwości mechaniczne, takie jak wytrzymałość na rozciąganie, granica plastyczności, wydłużenie i twardość (HRB), były brane pod uwagę jako wskaźniki jakości. Każdemu wskaźnikowi przypisano jednakowy współczynnik wagi, a następnie obliczono złożony wskaźnik jakości dla taśm o każdej grubości. Stwierdzono, że jakość walcowanych na gorąco taśm odpowiada poziomowi "dobry" empirycznej skali jakości. Nie stwierdzono istotnych różnic jakości taśm o różnych grubościach. Keywords: qualimetric methods, quality, hot rolling, hot-rolled strip, mechanical properties Słowa kluczowe: metody kwalimetryczne, jakość, walcowanie na gorąco, taśma walcowana na gorąco, właściwości mechaniczne.Introduction. Hot-rolled strip made of light al- loyed steel 20GYuT, produced at continuous hot rol- ling mill 1700 in ArcelorMittal Temirtau JSC, is used for manufacturing of side members of KAMAZ cargo trucks. Recently, the continuous-cast slabs are used as starting material instead of the rolled slabs. The quality of strip made of continuous-cast slabs is investigated in the paper. 72 batches of strips were taken into acco- unt, including 9 batche[...]

Formability and forming of welded semi-finished parts from corrosion resistant steel DOI:10.15199/24.2017.8.18


  Introduction. In power engineering, food industry, che mical industry and also in other industries the use of corro sion resistant steel espacially austenitic corrosion resistant steel became more and more widespread. These steels are usually used for forming of welded semi-finished parts or for welding of formed parts. Simulateneously application of these corrosion resistant steels need high corrosion resi stance in weld which requires to achieve certain percentual proportion of austenite even in weld metal. Corrosion re sistance is partially influenced by internal residual stresses and because of this the results of internal residual stress measurement on drawings ater cup test are in the paper. For welding of corrosion resitant steels many methods of welding are used. The paper is oriented on the research of welding processes influence on formability of SAF 2507 superduplex steel especially on forming of laser and elec tron beam welded semi-finished parts. 1 Analysis of mechanical properties and formability. The analysis of mechanical properties and formability SAF 2507 superduplex steel was made on the base of basic tensile test and Erichsen cup test. The chemical composition of studied steel is in Table 1 The required mechanical properties of given steel listed by producer are: - conventional yield strength Rp0,2 ≥ 550 MPa - tensile strength Rm = 800 to 1000 MPa. 1.1Tensile test. To establish the influence of aniso tropy on mechanical properties the tensile tests were made on test samples in the direction of rolling (direction 0o), perpendicular on rolling direction (direction 90o) and with angle of 45o to rolling direction (direction 45o). The test was made on EU-40 test machine according to STN EN ISO 6892-1 standard. The test samples were wtihout weld and with weld in the middle of the neck (Fig.1). Parameters of laser welding: - Power 750 W, - Wel[...]

Research of the dual phase steel DP450 properties from the forming aspects DOI:10.15199/24.2019.1.3


  Introduction. Automotive industry has significant sha􀀐 re on worldwide industrial production. Significantly con􀀐 tributes to research and development of new materials, development of new production methods and production operations. One of steel types developed and used especial􀀐 ly in automotive industry are dual phase steels. Because of this the paper studies plasticity and formability DP 450 dual phase steel with focus on processing by drawing. This steel is used for example for pillar lining and front fender pro􀀐 duction for C3 Picasso car [1, 2]. Studied material. The material DP 450 is dual phase steel, galvanized and cold rolled with thickness s = 1.17 mm. Chemical composition of the steel and required me􀀐 chanical properties are in tables 1 and 2. Microstructure analysis and microhardness measurement of studied material. Optical microscopy was used for basic microstructure analysis of metallographically pre􀀐 pared cross cuts of samples from experimental material. NEOPHOT 30 optical microscope was used for analysis. Metallographic preparation of samples consisted from: - sample extraction - from test sheets samples with length of approximately 15 mm were cut from various lo􀀐 cations, - mechanical grinding - by set of metallographic Table 1. Chemical composition of the DP 450 steel, mass % Tablica 1. Skład chemiczny stali DP 450, % mas. C Mn Si P S 0.05 to 0.10 0.05 to 1.60 < 0.40 < 0.04 < 0.015 Al Nb Ti V Cr 0.02 to 0.08 < 0.01 < 0.01 < 0.01 < 0.80 Table 2. Required mechanical properties of the DP 450 steel Tablica 2. Wymagane własności mechaniczne stali DP 450 Yield strength Rp0,2 [MPa] Tensile strength Rm [MP[...]

Compare of the Dies and They Influence of Geometry Precision of the Cold Drawing Tubes with Small Dimensions DOI:10.15199/24.2017.8.22


  Introduction. The article deals with production of seam less precision cold drawing tubes drawing without plug and the influence of technological parameters with effect on the mechanical properties of the tubes. The aim of the ex􀀐 periment is to verify the possibility of drawing hot rolled tubes by one pass technology from dimension 18 × 0.9 m with tempering after drawing to dimension 6 × 1 mm by selected reductions which abide by the factory conditions of Železiarne Podbrezová a.s.. At the End of the article is comparison of both of these dies on geometry and mechani cal properties (Rp0.2, Rm, A5.65). Next is the same com parison in software DEFORM 3D. With consideration of specialization on production seamless precision tubes in Železia[...]

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