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1
Content available Effectiveness of Absorbing Microwaves by the Multimaterial Sodium Silicate Base Sand - PLA (Polylactide) Mould Wall Systems
Stachowicz Mateusz
Archives of Foundry Engineering
|
2023
|
Vol. 23, iss. 3
30--37
EN
In the paper presented are results of a research on effectiveness of absorbing electromagnetic waves at frequency 2.45 GHz by unhardened sodium silicate base sands (SSBS) prepared of high-silica base sand and a PLA (Polylactide) 3D-prited (3DP) mould walls. Measurements of power loss of microwave radiation (Pin) expressed by a total of absorbed power (Pabs), output power (Pout) and reflected power (Pref) were carried-out on a stand of semiautomatic microwave slot line for determining balance of microwave power emitted into selected multimaterial systems. Values of microwave power loss in the rectangular waveguide filled with unhardened moulding sands and prepared by fused deposition modelling (FDM) 5 mm polylactide (PLA) walls with grid infill density from 25% to c.a. 100% served for determining effectiveness of microwave heating. Balance of microwave power loss is of technological importance for microwave manufacture of high quality casting sand moulds and cores in possibility of use 3D-printed mould tools and core boxes. It was found that apparent density of SSBS placed in a waveguide with PLA walls influences parameters of power output (Pout) and power reflected (Pref). The PLA wall position and grid infill density were identified to have a limited effect on effectiveness of absorbing microwaves (Pabs).
2
Content available Mulling and its Effect on the Properties of Sand-Water-Bentonite Moulding Mixture
Gawronová Martina, Kielar Š., Lichý Petr
Archives of Foundry Engineering
|
2022
|
Vol. 22, iss. 3
107--112
EN
Today, foundries are facing increasing demands for greener and more economical production while maintaining or improving the quality of the castings produced. The importance and use of green sand mixtures using bentonite as a binder are thus coming to the fore once again. They have the advantage of both eliminating the chemicalization of production and also allowing the immediate use of the already used mixture, including the binder, after adjustment of the composition and mulling. In order to maintain the quality of the resulting castings, it is necessary to monitor the properties of the moulding mixture through a series of laboratory tests. It is also essential to look at the processing quality of these mixtures, i.e. the combination of good mulling quality and efficient mulling time, which is often neglected. It is the quality of mulling and the effective mulling time that help to develop the bonding properties of the bentonite, improve the properties of the mixture, determine the efficiency of the muller and possibly reduce the time and energy required for mulling. The aim of this work is to present the effect of mulling on the properties of sand-water-bentonite mixtures. The properties studied are mainly the compactability, strength characteristics, moisture content of the mixture and the order of addition of raw materials.
3
Sytuacja polskiej branży odlewniczej w 2020 roku
Liszka Katarzyna, Dobosz Witold
Przegląd Odlewnictwa
|
2021
|
Vol. 71, nr 7-8
394--398
PL
Artykuł przygotowany został w oparciu o badanie ankietowe przeprowadzone wśród polskich odlewni. Na podstawie zebranych danych przedstawiono stan polskiego odlewnictwa w 2020 roku i wpływ pandemii COVID-19 na poziom produkcji krajowej oraz wskaźniki pośrednie jak poziom zatrudnienia, czy wielkość eksportu. Tłem do prezentowanych wyników jest rok 2019 i ogólna sytuacja w światowym i europejskim przemyśle odlewniczym. Przygotowane opracowanie stanowi bazę wiedzy dla przedstawicieli polskiego odlewnictwa w rozmowach z władzami gospodarczymi i organizacjami pozarządowymi oraz ważne na-rzędzie dla promocji i budowania konkurencyjności na arenie międzynarodowej, zwłaszcza w kontaktach z organizacjami międzynarodowymi takimi jak World Foundry Organization i CAEF – The European Foundry Association.
EN
The article was prepared on the basis of a survey conducted among Polish foundries. It presents the state of the Polish foundry industry in 2020 and the impact of the COVID-19 pandemic on the level of domestic production as well as indirect factors such as the level of employment or the volume of exports. The background for the analyzed results is data from 2019 and the general situation in the global and European foundry industry. The prepared study can become a base for representatives of the Polish foundry industry in their encounters with economic authorities and non-governmental organizations, and an important tool for promoting and building competitiveness on the international arena, especially in contacts with international organizations such as the World Foundry Organization and CAEF –The European Foundry Association.
4
Content available Design of Honeycomb Structures Produced by Investment Casting
Naplocha K., Dmitruk A., Mayer P., Kaczmar J. W.
Archives of Foundry Engineering
|
2019
|
iss. 4
76--80
EN
Investment casting combined with the additive manufacturing technology enables production of the thin-walled elements, that are geometrically complex, precise and can be easy commercialized. This paper presents design of aluminium alloy honeycombs, which are characterized with light structure, internal parallel oriented channels and suitable stiffness. Based on 3D printed pattern the mould was prepared from standard ceramic material subjected subsequently to appropriate heat treatment. Into created mould cavity with intricate and susceptible structure molten AC 44200 aluminium alloy was poured under low pressure. Properly designed gating system and selected process parameters enabled to limit the shrinkage voids, porosities and misruns. Compression examination performed in two directions showed different mechanisms of cell deformation. Characteristic plateau region of stress-strain curves allowed to determine absorbed energy per unit volume, which was 485 or 402 J/mm3 depending on load direction. Elaborated technology will be applied for the production of honeycomb based elements designated for energy absorption capability.
5
Content available Energy Savings in Foundries through Yield Improvement and Defect Reduction in Castings
Chokkalingam B., Raja V., Dhineshkumar M., Priya M., Immanual R.
Archives of Foundry Engineering
|
2018
|
Vol. 18, iss. 1
15--18
EN
Energy conservation is an important step to overcome the energy crisis and prevent environmental pollution. Casting industry is a major consumer of energy among all the industries. The distribution of electrical energy consumed in all the departments of the foundry is presented. Nearly 70% of the energy is consumed especially in the melting department alone. Production of casting involves number of process variables. Even though lot of efforts has been taken to prevent defects, it occurs in the casting due to variables present in the process. This paper focuses the energy saving by improving the casting yield and by reducing the rejections. Furthermore an analysis is made on power consumption for melting in the induction furnace to produce defective castings and improvement in the casting yield. The energy consumed to produce defective castings in all other departments is also presented. This analysis reveals that without any further investment in the foundry, it is possible to save 3248.15 kWh of energy by reducing the rejections as well as by improving the casting yield. The redesign of the feeding system and the reduced major rejection shrinkage in the body casting improved the casting yield from 56% to 72% and also the effective yield from 12.89% to 66.80%.
6
Najnowsza propozycja firmy Savelli dla odlewni
Przegląd Odlewnictwa
|
2007
|
Vol. 57, nr 6
278-279
PL
Najnowsza propozycją firmy Savelli jest nowa maszyna formierska z obrotowym stołem i systemem formowania FormimpressŽ. Maszyna ta może zastąpić nawet kilka par formierek wstrząsowo-prasujących typu FKT. Przedstawiono w artykule zalety i parametry pracy nowej maszyny formierskiej, które dla formowania stanowią istotne znaczenie.
EN
The newest achievement of the Savelli Company is the moulding machine with a turn-table and the moulding system FormimpressŽ. This machine can substitute even several jolt and squeeze moulding machines, FKT type. Advantages and operational parameters of this new moulding machine, significant for the proper performance of the process, are presented in the paper.
7
Content available remote Zasady projektowania struktury technologicznej gniazd formowania maszynowego wyposażonych w przenośniki wałkowe
Wrona R., Stawowy A., Macioł A.
Archiwum Odlewnictwa
|
2005
|
R. 5, nr 17
375--384
PL
Gniazda formowania maszynowego wyposażone w przenośniki wałkowe są bardzo rozpowszechnione w odlewniach o produkcji mało seryjnej i przy zróżnicowanym asortymencie odlewów. Szczególnie mają zastosowanie w systemie okresowego zalewania form, w którym konieczne jest magazynowanie form przed zalaniem na tzw. powierzchniach odstawczych utworzonych z ciągów przenośników wałkowych. Strukturę gniazd tworzą pary maszyn wraz z urządzeniami transportu poziomego i pionowego. Główne zadania, które rozwiązano w opracowaniu dotyczą określenia powierzchni pola odstawczego oraz organizacji całego procesu od momentu wykonania formy do jej wybicia ze skrzynek. Procedura rozwiązania ujmuje postępowanie optymalizacyjne.
EN
The work centers of the machine moulding equipped with the roller conveyers are very popular in the foundries with short-run production and with a different assortment of castings. They are used especially in a system of a periodic pouring into moulds where it is necessary to store the moulds before pouring on the so called deposit surfaces formed by the sequence of the roller conveyers. The structure of the work centers is formed by the pairs of the moulding machines together with facilities of the horizontal and vertical handling. The main tasks which solutions are presented in this study refer to the designation of the surface of the deposit area and to the organization of the whole process from the moment when the mould is maid to its extraction from the flask. The procedure of the solution formulates the most favourable conduct.
8
Nowoczesne strategie organizacji i zarządzania w odlewniach. Cz. 1, Różne rodzaje struktury organizacyjnej
Bauck H.
Biuletyn Instytutu Odlewnictwa
|
2000
|
R. 3, nr 3
33-40
9
Nowoczesne strategie organizacji i zarządzania w odlewniach. Cz. 2, Formy organizacji i ich analiza porównawcza
Bauck H.
Biuletyn Instytutu Odlewnictwa
|
2000
|
R. 3, nr 4
21-30
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