Wyniki wyszukiwania - BazTech

1

Distortion Analysis of Thin-Walled Investment Castings

Mandal R., Roy Soumyajit, Sarkar Subhajit, Mandal T., Pramanick A. K., Majumdar G.

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 3

59--60

EN

Dokra casting is famous for its Artistic value to the world but it is also sophisticated engineering. The technique is almost 4500 years old. It is practiced by the tribal artisans of India. It is a clay moulded wax-based thin-walled investment casting technique where liquid metal was poured into the red hot mould. Dimensional accuracy is always preferable for consumers of any product. Distortion is one of the barriers to achieving the accurate dimension for this type of casting especially for the bending parts. The cause and nature of the distortion for this type of casting must be analyzed to design a product with nominal tolerance and dimensional accuracy.

2

Dimensional-Shape Verification of a Selected Part of Machines Manufactured by Additive Techniques

Bernaczek Jacek, Budzik Grzegorz, Dziubek Tomasz, Przeszłowski Łukasz, Wójciak Kinga

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 1

46--57

EN

The publication covers the complex process of analyzing the accuracy of mapping models produced in AM (Additive Manufacturing) processes with a thermoplastic material – FFF (Fused Filament Fabrication) and polymerization of light-curing resin – PolyJet. The research was conducted with the use of an advanced optical measuring system – the GOM Atos 3D scanner. The part selected for the research in question was the water pump body as a representative example of an element with adequate dimensional and shape conditions (high degree of folding and geometric differentiation) allowing, based on the results of coordinate measurements determined in the research process, to define the potential area of application of AM models made of thermoplastic material and resin hardened with UV light. The performed tests showed the accuracy of individual AM methods at a level within the range declared by machine manufacturers. However, the PolyJet body is characterized by a much higher accuracy of the shape mapping compared to the FFF body. The dimensional accuracy is also higher for the resin model in relation to the thermoplastic model, which results primarily from the thickness of the elementary layer of the model material applied by the printing module defined for individual incremental processes – 16 μm for RGD 720 and 0.2 mm for ABS. Detailed elaboration and analysis of the research results are presented in this publication.

3

Reconstruction of small components using photogrammetry: a quantitative analysis of the depth of field influence using a miniature step gauge

Guerra Maria Grazia, Galantucci Luigi Maria, Lavecchia Fulvio, De Chiffre Leonardo

Metrology and Measurement Systems

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2021

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Vol. 28, nr 2

323--342

EN

In this work, authors investigated the effect of the Depth of Field (DoF) reduction, arising when the acquisition of small objects is carried out with a photogrammetry-based system using a Digital Single Lens Reflex (DSLR) camera and the structure from motion (SfM) algorithm. This kind of measuring instrument is very promising for industrial metrology according to the paradigms of the fourth industrial revolution. However, when increasing the magnification level, necessary for the reconstruction of sub-millimetric features, there is a corresponding decrease of the DoF, leading to possible effects on the reconstruction accuracy. Thus, the effect of the DoF reduction was analysed through the reconstruction of a well-known artefact: the step gauge. The analysis was conducted considering the theory behind the DoF concept, the analysis of the 2D images, input of photogrammetric reconstruction and, finally, the results in terms of dimensional verification of the reconstructed step gauge.

4

Numerical and experimental study on the inner diameter uniformity of hollow shafts in cross-wedge rolling with mandrel

Zhou Jing, Shen Jinxia, Wang Baoyu, Huang Xu, Guo Wei

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 3

321--336

EN

The precision forming of inner hole is one of technological bottlenecks in Cross-wedge Rolling (CWR) of hollow shaft with mandrel. The inner diameters show signs of characteristic fluctuation despite under the control of mandrel. The uniformity of inner diameter was investigated by finite element simulation and experiments in this study. The inner hole expands at the knifing stage and shrinks at the sizing stage. The dimensional fluctuation of inner diameter is mainly resulting from the improper metal flow. The radial and axial metal flows are insufficient at the knifing stage, which resulting in the hole expansion at knifing zone. The hole shrinkage is caused by the relatively adequate radial metal flow at sizing stage. The experiment results show that the hole expansion increases with the increasing stretching angle and mandrel diameter and decreases with the increasing forming angle and initial wall thickness. The hole expansion first increases and then decreases with the increasing reduction ratio. The hole shrinkage has positive correlations with forming angle, reduction ratio and initial wall thickness, and negatively correlates with stretching angle and relative mandrel diameter. A modified CWR roll with the curved-surface knife is proposed to get rid of the hole expansion. Based on experiments and simulations, the most suitable geometric parameters of the curved-surface knife are determined. Using mandrel diameter compensation can reduce the phenomenon of hole shrinkage. These methods were applied to the trial rolling of a half-shaft sleeve part, and the results show that the methods significantly restrain the inner diameter fluctuation.

5

Effect of increased temperature on dimensional and shape accuracy of castings produced from the EN AC-AlSi11 alloy by pressure die casting process

Jarco A.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 1

325--328

EN

The present work discusses results of increased temperature on shape-dimensional changes of a 110 type hose coupling, produced from EN AC-AlSi11 alloy with the use of pressure die casting technology. The castings were soaked for 3.5 h at temperatures 460°C, 475°C and 490°C. The verification of shape-dimensional accuracy of the elements after soaking treatment, in relation to raw casting, was carried out by comparing the 3D models received from 3D scanning. Soaking temperature of about 460°C-475°C results in no significant changes in the shapes and dimensions of the castings, or surface defects in the form of blisters, which can be seen at a temperature of 490°C.

6

Taguchi Approach for Optimization of Parameters that Reduce Dimensional Variation in Investment Casting

Bansode S. N., Phalle V. M., Mantha S.

Archives of Foundry Engineering

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2019

|

iss. 1

5--12

EN

Variation in final casting dimensions is a major challenge in the investment casting industry. Additional correction operations such as die tool reworking as well as coining operations affect foundry productivity significantly. In this paper influence of basic parameters such as wax material, mould material, number of ceramic coats and feed location on the dimensional accuracy of stainless-steel casting has been investigated. Two levels of each factor were chosen for experimental study. Taguchi approach has been used to design the experiment and to identify the optimal condition of each parameter for reduced dimensional deviation. Analysis of variance has been carried out to determine the contribution of each process parameter. The result reports that selected parameters have significant effect on the dimensional variability of investment casting. Mould material is the dominant parameter with the largest contribution followed by number of ceramic coats and wax material whereas feed location is having negligible contribution.

7

Numerical and experimental research on cross wedge rolling hollow shafts with a variable inner diameter

Shen Jinxia, Wang Baoyu, Zhou Xu, Li Junling

Archives of Civil and Mechanical Engineering

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2019

|

Vol. 19, no. 4

1497--1510

EN

The precise forming of inner hole has been a major technical difficulty in the cross wedge rolling (CWR) of hollow shaft. This paper proposes a new process to form hollow shafts with variable inner diameters by using the CWR with mandrel control. The forming characteristics and dimension precision of this process are analyzed by combining finite element modelling (FEM) and forming trials. The hole step of hollow shaft with variable inner diameter is formed in a spiral pattern. The helixes result in many micro-steps in hole step when forming the right-angle inner step. The metal flow lines demonstrated that mandrel step hindered the axial metal flow of inner hole and the metals were accumulated in hole step. The rolling load increases in the process of forming hole step. The mandrel is subjected to axial load when hole contacts the mandrel step. The roundness can be improved by reducing the mandrel diameter in knifing position. The axial accuracy of inner diameter can be classed as three parts: hole expansion, stable rolling, hole shrinkage. The compensated mandrel was designed to improve axial precision of inner diameter. The results showed that the inner hole dimension can be effectively controlled.

8

The application of computed tomography in the automotive world – how industrial CT works

Barciewicz M., Ryniewicz A.

Technical Transactions

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2018

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Vol. 115, iss. 9

181--187

EN

This paper shows how industrial computed tomography (CT) works, its benefits and where it can be used in automotive world. As a non-destructive quality control technique (NDT), CT allows not only the measurement and evaluation of external and internal geometry, but is also useful for making reports with a visualisation of an entire component, e.g. a map of shape deviation and internal structural defects.

PL

W artykule przedstawiono zasadę działania przemysłowej tomografii komputerowej (TK), jej zalety oraz zastosowanie w branży motoryzacyjnej. Jako nieniszcząca technika kontroli jakości (NDT), TK pozwala nie tylko na pomiar i ocenę geometrii zewnętrznej i wewnętrznej, ale jest również przydatna w sporządzaniu raportu z wizualizacją całej części, np. mapy odchyłek kształtu czy defektów struktury wewnętrznej.

9

Dimensional accuracy and surface roughness of polymeric dental bridges produced by different 3D printing processes

Dikova T. D., Dzhendov D. A., Ivanov I., Bliznakova K.

Archives of Materials Science and Engineering

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2018

|

Vol. 94, nr 2

65--75

EN

Purpose: To compare the dimensions accuracy and surface roughness of polymeric dental bridges produced by different 3D printers. Design/methodology/approach: Four-part dental bridges were manufactured by three printing systems working on the basis of digital light projection (DLP) stereolithography (SLA), laser-assisted SLA and fused deposition modeling (FDM). The materials used from SLA printers are liquid methacrylate photopolymer resins, while FDM printer use thin wire plastic polylactic acid. The accuracy of the external dimensions of dental bridges was evaluated and the surface roughness was measured. Findings: It was found that compared to the base model, the dimensions of the SLA printed bridges are bigger with 1.25%-6.21%, while the corresponding dimensions of the samples, made by FDM are smaller by 1.07%-4.71%, regardless the position of the object towards the substrate. The samples, produced by FDM, are characterized with the highest roughness. The average roughness deviation (Ra) values for DLP SLA and lase-assisted SLA are 2.40 pm and 2.97 pm, respectively. Research limitations/implications: For production of high quality polymeric dental constructions next research should be targeted to investigation of the polymerization degree, stresses and deformations. Practical implications: Our study shows that 3D printers, based on laser-assisted and DLP SLA, can be successfully used for manufacturing of polymeric dental bridges - temporary restorations or cast patterns, while FDM system is more suitable for training models. The results will help the dentists to make right choice of the most suitable 3D printer. Originality/value: One of the largest fixed partial dentures - four-part bridges, produced by three different commercial 3D printing systems, were investigated by comparative analysis. The paper will attract readers’ interest in the field of biomedical materials and application of new technologies in dentistry.

10

Wybrane cechy geometryczne i wskaźniki wytrzymałościowe elementów wykonanych metodą modelowania uplastycznionym tworzywem

Pepliński K., Czyżewski P., Górecki D., Sykutera D., Bieliński M.

Polimery

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2017

|

T. 62, nr 3

198--207

PL

W ramach pracy zbadano serię próbek z terpolimeru akrylonitryl-butadien-styren, wykonanych metodą modelowania uplastycznionym tworzywem (FDM), która należy do najpopularniejszych metod wytwarzania przyrostowego. Do otrzymania próbek użyto drukarki 3D Dimension Elite BST 786 (Stratasys). Próbki referencyjne otrzymano metodą wtryskiwania z zastosowaniem wtryskarki laboratoryjnej Battenfeld 350 Plus. Określono wpływ grubości warstwy tworzywa oraz orientacji modelu w przestrzeni roboczej urządzenia na właściwości mechaniczne wyrobów, a także na ich dokładność wymiarową. W tym celu wybrano trzy różne kąty orientacji wytwarzanych przyrostowo próbek względem osi Y (0°, 45° lub 90°) oraz dwie grubości warstwy (0,254 lub 0,178 mm). Stwierdzono, że właściwości próbek wykonanych metodą FDM były z reguły gorsze niż właściwości próbek otrzymanych metodą wtryskiwania oraz że najlepszymi właściwościami charakteryzowały się próbki wytwarzane z zastosowaniem większej grubości warstwy i kąta orientacji wynoszącego 90°.

EN

In this work, we investigated a series of specimens made of acrylonitrile-butadiene-styrene terpolymer using fused deposition modeling (FDM) method, currently one of the most popular additive manufacturing techniques. We used Dimension Elite BST 786 (Stratasys) 3D printer for the manufacture of specimens, while reference samples were produced by injection molding using laboratory injection molding machine Battenfeld 350 Plus. The effect of the plastic layer thickness and orientation of the model in the device workspace on the mechanical properties and dimensional stability of the products was studied. For this purpose, three different specimen orientation angles with respect to Y axis: 0° (flat), 45° (hemispheric) and 90° (lateral) and two layer thicknesses: 0.254 mm and 0.178 mm were assumed. It was found that the properties of the specimens produced by FDM method are generally less advantageous than those of injection-molded samples. The best specimen properties were obtained using the higher layer thickness and orientation angle of 90°.

11

Wpływ odmian obróbki części klasy mimośrody na dokładność i chropowatość toczonej powierzchni mimośrodowej

Płonka S., Pytlak B., Dyniewicz A.

Inżynieria Maszyn

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2017

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R. 22, z. 1

19--34

PL

W pracy scharakteryzowano odmiany obróbki części klasy mimośrody. Określono wpływ odmian obróbki, a w szczególności sposobów ustalania mimośrodowości na dokładność i chropowatość toczonej powierzchni mimośrodowej. Analizowanym przykładem była obróbka wałka mimośrodowego skrzynki grzebieniowej na tokarce CNC TUG-56MN. Uzyskane wartości toczonego kształtująco mimośrodu z zastosowaniem tablic krzywych i kąta dyskretyzacji ΔC=2º oraz z zastosowaniem wielopozycyjnego przyrządu były prawie identyczne, natomiast wartość toczonego mimośrodu z użyciem podkładki pod jedną ze szczęk samocentrującego uchwytu trójszczękowego wyraźnie odbiegała od wymaganej wartości podanej w dokumentacji konstrukcyjnej. Chropowatość uzyskanych powierzchni określona średnią arytmetyczną rzędnych profilu Ra na obwodzie toczonego mimośrodu ulegała zmianom, w szczególności podczas toczenia z zastosowaniem tablic krzywych, co wynikało ze zmian geometrii ostrza w różnych położeniach kątowych obrabianego mimośrodu.

EN

The machining methods of eccentric workpieces were characterized in the paper. The impact of the machining method on the accuracy and surface roughness of the eccentric surface was determined. The analysed example was machining method of eccentric shaft for comb box on CNC lathe TUG-56MN. The received values for turned eccentric shape with using curves table and discretization angle ΔC=2º and using a multi-position production jig were almost identical, while the value for turned eccentric shape with use washer under one of the jaws of self-centering chuck are differed from the required value given in the construction documentation. The roughness of received surface determined by the average roughness Ra on the periphery of the turned eccentric shape is changed in particular with the use of curved tables as a result of changes in edge geometry at different angular positions of the machined eccentricity. The largest surface roughness of the eccentric occurred during turning using curved tables, while the smallest using a washer under one of the jaws of the self-centering lathe.

12

Dimensional accuracy of parts manufactured by 3d printing for interaction in virtual reality

Górski F., Wichniarek R., Kuczko W., Zawadzki P., Buń P.

Advances in Science and Technology. Research Journal

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2017

|

Vol. 11, no 4

279--285

EN

Realism of a Virtual Reality simulation can be improved by use of physical objects tracked in real time. The paper presents possibility of using low-cost FDM process, realized by MakerBot Replicator 2X machine, in comparison with a professional one to build tooling for a simulation of ultrasound examination procedure. The objects were manufactured on two different machines out of ABS material, 3D scanned for accuracy testing and finally possibilities of their use in a VR system were evaluated.

13

Analiza właściwości mechanicznych i dokładność wymiarów cienkościennych kształtowników zamkniętych wyciskanych ze stopu AW6082

Borowski J., Płaczek G., Jurczak H., Leśniak D., Libura W., Zasadziński J., Rękas A.

Obróbka Plastyczna Metali

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2016

|

T. 27, nr 1

7--20

PL

W pracy przedstawiono wyniki badań właściwości wyciskanych cienkościennych (grubość ścianki ok. 1,2 mm) kształtowników zamkniętych ze stopu AW6082 w stanie T5. Kształtowniki wyciskano metodą wyciskania zgrzewającego, za pomocą 6-otworowych matryc mostkowo-komorowych. Optymalizowano parametry wyciskania zmieniając prędkość wyciskania oraz szybkość chłodzenia. Wyznaczono właściwości mechaniczne, twardość, grubość ścianek oraz chropowatość powierzchni kształtowników poddanych wyciskaniu z różną prędkością (9, 10 i 12 m/min), chłodzonych na wybiegu prasy z różną szybkością chłodzenia (natryskiwanie wodne-spray, fala wodna) oraz starzonych sztucznie w temperaturze 180oC w czasie 2 godzin. Na podstawie badań stwierdzono, że przy najwyższej zastosowanej prędkości wyciskania 12 mm/min udało się osiągnąć wysokie właściwości mechaniczne oraz drobnoziarnistą równomierną strukturę. Na podstawie badań grubości profili stwierdzono, że pomimo otrzymania wyrobu o zadowalającej tolerancji grubości istnieje konieczność korekty matrycy, aby uzyskać bardziej równomierny rozkład. Zmiana grubości ścianki owalnego profilu wynika nie tylko ze szczeliny wypływu ale również z trudnego do przewidzenia na etapie projektowania ugięcia matrycy podczas wyciskania. Prędkość wyciskania wpływa również na jakość powierzchni profilu, która wyrażona poprzez parametr chropowatości Ra jest najgorsza przy wyciskaniu z prędkością 9m/min. W wyniku wzrostu prędkości wyciskania do 10 lub 12 mm/min chropowatość obniża się, co poprawia jakość powierzchni. Zmiana szybkości chłodzenia z chłodzenia powietrzem na natryskiwanie wodne lub za pomocą tzw. fali wodnej spowodowała wzrost wytrzymałości do zakładanej i pożądanej przez odbiorcę końcowego tj. Rm, > 310 MPa, ale jednocześnie nie wpłynęło to na znaczny spadek wydłużenia względnego A.

EN

This paper presents the results of tests of the properties of hollow thin-walled (wall thickness approx. 1.2 mm) shapes made of AW6082 alloy in T5 state. Shapes were extruded using the bonding extrusion method, by means of 6-hole porthole dies. Extrusion parameters were optimized by changing the rate of extrusion and cooling. Mechanical properties, hardness, wall thickness and surface coarseness of shapes subjected to extrusion at various rates (9, 10 and 12 m/min), cooled on the press coasting at different cooling rates (water spray, water wave), and artificially aged at a temperature of 180 oC over 2 hours, were determined. Based on the tests, it was found that high mechanical properties and a uniform, finegrained structure were successfully achieved at the highest applied extrusion rate of 12 mm/min. Based on the shape thickness measurements, it was determined that, despite achievement of a product of satisfactory thickness tolerance, it is necessary to correct the die to obtain more uniform distribution. The change of the wall thickness of the oval shape results from the complexity of the die orifice and also from the die deflection during extrusion, which is difficult to predict at the designing stage. Extrusion rate also has an impact on the surface quality of the shape, which is expressed by the parameter of coarseness Ra, and this quality was lowest for extrusion at a rate of 9 m/min. As a result of an increase in extrusion rate from 10 to 12 mm/min, coarseness is reduced, improving surface quality. The change in cooling rate from air cooling to water spraying or by means of a so-called water wave caused an increase of strength to the level assumed and desired by the end recipient, i.e. Rm, > 310 MPa, but at the same time, did not have an impact on the significant reduction of relative elongation A.

14

Propozycja metody zwiększania dokładności wymiarowej obiektów wykonywanych technikami przyrostowymi

Piękoś J., Siemiński P., Grygoruk R.

Mechanik

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2016

|

R. 89, nr 12

1910--1911

PL

Artykuł przedstawia wyniki analizy wymiarowej obiektów wykonanych techniką przyrostową (drukiem 3D). Zaproponowano prostą metodę zwiększenia dokładności drukowanych modeli poprzez wprowadzenie współczynnika kompensującego błędy procesu. W oparciu o wyniki analizy modelu badawczego wyznaczono wartość współczynnika skalowania, który pozwolił na znaczne zmniejszenie wartości błędu względnego mierzonych wymiarów. W ramach pracy wykonano weryfikację poprawności zaprezentowanej metody z wykorzystaniem optycznego skanera 3D.

EN

This article presents the results of dimensional analysis of models which were made using 3D printing. We proposed a simple method of increasing dimensions of printed models using compensation scale factor. Scale factor allowed us to decrease relative error of measured dimensions. The verification of presented method was performed using optical 3D scanner.

15

Ocena dokładności wymiarowo-kształtowej otworów wierconych wiertłami składanymi

Nowakowski Ł., Miko E., Skrzyniarz M.

Mechanik

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2016

|

R. 89, nr 8-9

1200--1201

PL

W artykule opisano ocenę dokładności wymiarowo-kształtowej otworów wierconych wiertłami składanymi z zastosowaniem różnych sposobów doprowadzenia cieczy chłodząco-smarującej.

EN

The article describes evaluation of accuracy dimensionally shaped holes drilled by indexable insert drill using different modes of administration of cutting fluid.

16

Comparison of Dental Prostheses Cast and Sintered by SLM from Co-Cr-Mo-W Alloy

Myszka D., Skrodzki M.

Archives of Foundry Engineering

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2016

|

Vol. 16, iss. 4

201--207

EN

The article presents the results of a comparative analysis of the metal substructure for dental prosthesis made from a Co-Cr-Mo-W alloy by two techniques, i.e. precision investment casting and selective laser melting (SLM). It was found that the roughness of the raw surface of the SLM sinter is higher than the roughness of the cast surface, which is compensated by the process of blast cleaning during metal preparation for the application of a layer of porcelain. Castings have a dendritic structure, while SLM sinters are characterized by a compact, fine-grain microstructure of the hardness higher by about 100 HV units. High performance and high costs of implementation the SLM technology are the cause to use it for the purpose of many dental manufacturers under outsourcing rules. The result is a reduction in manufacturing costs of the product associated with dental work time necessary to scan, designing and treatment of sinter compared with the time needed to develop a substructure in wax, absorption in the refractory mass, casting, sand blasting and finishing. As a result of market competition and low cost of materials, sinter costs decrease which brings the total costs related to the construction unit making using the traditional method of casting, at far less commitment of time and greater predictability and consistent sinter quality.

17

Influence of the type of inserts on dimensional accuracy in turning process

Polák P., Žitňanský J., Adamik M.

Management Systems in Production Engineering

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2015

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nr 3 (19)

128--132

EN

This article is aimed to demonstrate the effect of cutting material and geometry of inserts chip breaker for dimensional accuracy in turning. The experiment is aimed on measuring compliance with dimensional accuracy in turning of samples from steel 11 523 at a constant feed rate and depth of cut, with varying spindle speeds. Machining was performed by using a different types of replaceable inserts. The measurement results will be evaluated in terms of the impact of differ-ent geometry characteristics and changing speeds spindle.

PL

Celem artykułu jest przedstawienie wpływu obrabianego materiału i geometrii noża na wymiarową dokładność procesu toczenia. Eksperyment jest zorientowany na pomiar zgodności próbek wykonanych ze stali 11 523 z zadaną dokładnością wykonania zawartą w dokumentacji technicznej, ze stałym posuwem oraz głębokością toczenia oraz zmienną prędkością obrotową. Obróbka została wykonana z użyciem różnego rodzaju narzędzi. Wyniki pomiarów oceniono z perspektywy wpływu charakterystyk geometrycznych oraz zmian prędkości obrotowej.

18

Dokładność wymiarowo-kształtowa oraz warstwa wierzchnia elementów wytwarzanych metodą obróbki EDM

Zagórski K., Kudelski R., Skrzypkowski K., Kapusta M.

Logistyka

|

2015

|

nr 4

9964--9972, CD3

PL

W artykule przedstawiono ogólna charakterystykę uzyskanych wyników obróbki elektroerozyjnej, zaliczaną do niekonwencjonalnych metod wytwarzania, na przykładzie stali 40H. Szczególną uwagę poświęcono uzyskanej chropowatości oraz dokładności wymiarowo-kształtowej przedmiotu w zależności od przyjętych nastaw generatora impulsów drążarki EDM. Obróbka ta jest wykorzystywana przy wytwarzaniu elementów z materiałów trudnoskrawalnych (twardych po obróbce cieplnej) jak i do elementów o skomplikowanych kształtach. Na podstawie przeprowadzonych badań wyznaczono procentowy wskaźnik rozbicia, określający procentowy wzrost wielkości powstałego gniazda w stosunku do wymiaru elektrody. Wykazano również, że chropowatość powierzchni predefiniowana w układzie sterowanie obrabiarki EDM różni się od rzeczywistej chropowatości powierzchni przedmiotu obrabianego, otrzymanej po procesie elektrodrążenia.

EN

The article presents a general characterization of the results obtained after EDM machining, that belongs to the unconventional methods, for example steel 40H. Particular attention was paid to the resulting surface roughness and the dimensional accuracy of the part which depend on the EDM pulse generator settings. The EDM machining is used in the manufacture of components with hard materials and components with complicated shapes. The percentage break indicator were determined based on the research, which calculates the percentage increase in the volume of the resulting slot in relation to the size of the electrode. It was also shown that the surface roughness predefined in the control system of EDM machine differs from the actual surface roughness of the workpiece obtained after the process of EDM.

19

Analysis of Impact of the Multilayer Ceramic Moulds Quality on the Steel Precision Castings Dimensional Accuracy

Haratym R., Biernacki R., Kwapisz J.

Archives of Foundry Engineering

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2015

|

Vol. 15, iss. 2 spec.

27--30

EN

Results of analysis presented in this paper were based on analysis of casts made especially for this research purpose and related to actual cast – industrial. The evaluation of the dimensional accuracy of casts was made in relation to the pressure of the liquid metal with consideration of the ceramic mould temperature. Ceramic moulds used in these analyses were made from crystalline quartz with an aqueous colloidal silica binder containing polymers (KK), and ethyl silicate (KE).

20

Shape Errors, Internal Porosity, Linear Dimensions Accuracy and Allowances for the Machining of Castings Made in the Replicast CS Process

Haratym R., Sieczka M., Biernacki R., Kwapisz J.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 3

25--28

EN

This research presents comprehensive assessment of the precision castings quality made in the Replicast CS process. The evaluation was made based on quality of the surface layer, shape errors and the accuracy of the linear dimensions. Studies were carried out on the modern equipment, among other things a Zeiss Calypso measuring machine and profilometer were used. Obtained results allowed comparing lost wax process models and Replicast CS process.