Autor: Konopka, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Influence of the Method of Mould Filling on the Quality of Castings Made of EN AC-44000 or EN AC-46200 Alloy
Autorzy:: Nadolski, M.
Konopka, Z.
Łągiewka, M.
Zyska, A.
Powiązania:: https://bibliotekanauki.pl/articles/380335.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry materials
innovative foundry technologies
plaster mould
counter-gravity casting
vacuum casting
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
forma odlewnicza
odlewanie próżniowe
Opis:: The performed examinations concerning the process of filling the plaster ceramic moulds with aluminium alloys allowed to assess the influence of various methods of introducing the metal into the mould cavity on the macro- and microstructure of the obtained experimental castings. The comparison was performed for castings with graded wall thickness made either of EN AC-44000 alloy or of EN AC-46000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting. It was found that the silicon crystals grow in size with an increase in wall thickness due to the slower cooling and solidification of castings.
Źródło:: Archives of Foundry Engineering; 2014, 14, 4; 73-76
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Influence of the Mould Filling Conditions on the Quality of Castings Made of EN AC-44000 Alloy
Autorzy:: Nadolski, M.
Konopka, Z.
Łągiewka, M.
Zyska, A.
Powiązania:: https://bibliotekanauki.pl/articles/380440.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry materials
innovative foundry technologies
plaster mould
counter-gravity casting
vacuum casting
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
forma odlewnicza
odlewanie próżniowe
Opis:: The work deals with the influence of change in the filling conditions of the ceramic moulds with plaster binder on the presence of gaseous porosity and the microstructure of the achieved test castings with graded wall thickness. Castings made of EN AC-44000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting were compared. The results of examinations concerning the density of the produced castings indicate that no significant change in porosity was found. The increased size of silicon crystals was found for the increased wall thicknesses due to the slower cooling and solidification of castings.
Źródło:: Archives of Foundry Engineering; 2014, 14, 2; 19-22
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Effect of Vacuum Assistance on the Quality of Castings Produced by High Pressure Die Casting Method
Autorzy:: Łągiewka, M.
Konopka, Z.
Nadolski, M.
Zyska, A.
Powiązania:: https://bibliotekanauki.pl/articles/380704.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
aluminium alloys
quality of castings
surface roughness
defects in pressure die castings
innowacyjne technologie odlewnicze
stopy aluminium
jakość odlewów
chropowatość powierzchni
defekty
Opis:: The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.
Źródło:: Archives of Foundry Engineering; 2014, 14, 2; 23-26
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Influence of Home Scrap on Porosity of MgAl9Zn1 Alloy Pressure Castings
Autorzy:: Konopka, Z.
Chojnacki, A.
Łągiewka, M.
Zyska, A.
Powiązania:: https://bibliotekanauki.pl/articles/381808.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
automatyzacja w odlewni
robotyka w odlewni
ochrona środowiska
porowatość
stopy magnezu
innovative foundry technologies
innovative foundry materials
automation in foundry
robotics in foundry
environmental protection
porosity
magnesium alloys
Opis:: The work presents the results of examinations concerning the influence of various amounts of home scrap additions on the porosity of castings made of MgAl9Zn1 alloy. The fraction of home scrap in the metal charge ranged from 0 to 100%. Castings were pressure cast by means of the hot-chamber pressure die casting machine under the industrial conditions in one of the domestic foundries. Additionally, for the purpose of comparison, the porosity of specimens cut out directly of the MgAl9Zn1 ingot alloy was also determined. The examinations consisted in the qualitative assessment of porosity by means of the optical microscopy and its quantitative determination by the method of weighting specimens in air and in water. It was found during the examination that the porosity of castings decreases with an increase in the home scrap fraction in the metal charge. The qualitative examinations confirmed the beneficial influence of the increased home scrap fraction on the porosity of castings. It was concluded that the reusing of home scrap in a foundry can be a good way of reduction of costs related to the production of pressure castings.
Źródło:: Archives of Foundry Engineering; 2017, 17, 1; 99-102
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The Influence of Home Scrap on Mechanical Properties of MgAl9Zn1 Alloy Castings
Autorzy:: Konopka, Z.
Chojnacki, A. C.
Łągiewka, M.
Zyska, A.
Powiązania:: https://bibliotekanauki.pl/articles/382859.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative foundry materials
automation in foundry
robotics in foundry
environmental protection
mechanical properties
magnesium alloys
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
automatyzacja w odlewni
robotyka w odlewni
ochrona środowiska
właściwości mechaniczne
stopy magnezu
Opis:: The work presents the results of examinations concerning the influence of various amounts of home scrap additions on the properties of castings made of MgAl9Zn1 alloy. The fraction of home scrap in the metal charge ranged from 0 to 100%. Castings were pressure cast by means of the hot-chamber pressure die casting machine under the industrial conditions in one of the domestic foundries. The examinations consisted in the determination of the following properties: tensile strength Rm, yield strength Rp0.2, and the unit elongation A5, all being measured during the static tensile test. Also the hardness measurements were taken by the Brinell method. It was found that the mechanical properties (mainly the strength properties) are being improved up to the home scrap fraction of 50%. Their values were increased by about 30% over this range. Further rise in the home scrap content, however, brought a definite decrease in these properties. The unit elongation A5 exhibited continual decrease with an increase in the home scrap fraction in the metal charge. A large growth of hardness was noticed for the home scrap fraction increasing up to the value of 50%. Further increasing the home scrap percentage, however, did not result in a significant rise of the hardness value any more.
Źródło:: Archives of Foundry Engineering; 2017, 17, 2; 39-42
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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