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Gußrohstellen

English translation: Casting rough spots

02:26 Sep 29, 2018
German to English translations [PRO]
Tech/Engineering - Automotive / Cars & Trucks
German term or phrase: Gußrohstellen
Das ist ein Guss Fehler Typ.
Nguyen Viet Chuong (X)
Vietnam
Local time: 12:33
English translation:Casting rough spots
Explanation:
Molding Material Defects

The defects in this category are cuts and washes, metal penetration, fusion, and swell.

Cut and washes

These appear as rough spots and areas of excess metal, and are caused by erosion of molding sand by the flowing metal. This is caused by the molding sand not having enough strength and the molten metal flowing at high velocity. The former can be taken care of by the proper choice of molding sand and the latter can be overcome by the proper design of the gating system.
Selected response from:

Shilpa Oka
India
Local time: 11:03
Grading comment
Thanks a lot for your helps
4 KudoZ points were awarded for this answer



Summary of answers provided
4Rough cast(ing) surface defects
Johannes Gleim
3Casting rough spots
Shilpa Oka


Discussion entries: 4





  

Answers


2 days 7 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
Casting rough spots


Explanation:
Molding Material Defects

The defects in this category are cuts and washes, metal penetration, fusion, and swell.

Cut and washes

These appear as rough spots and areas of excess metal, and are caused by erosion of molding sand by the flowing metal. This is caused by the molding sand not having enough strength and the molten metal flowing at high velocity. The former can be taken care of by the proper choice of molding sand and the latter can be overcome by the proper design of the gating system.


    https://nptel.ac.in/courses/112107144/metalcasting/lecture15.htm
Shilpa Oka
India
Local time: 11:03
Works in field
Native speaker of: Native in MarathiMarathi, Native in EnglishEnglish
PRO pts in category: 4
Grading comment
Thanks a lot for your helps

Peer comments on this answer (and responses from the answerer)
agree  Kim Metzger: Sand casting has many defects that can occur due to the mold failing. The castings produced have rough spots and excess material. https://en.wikipedia.org/wiki/Casting_defect
2 hrs
disagree  Johannes Gleim: "casting rough spots" are one of several casting defects, all on the surface. Another type is "Metal penetration", see your link." We should used a more general designation, covering all similar defects.
6 days
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2 days 7 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
Rough cast(ing) surface defects


Explanation:
Gussfehler sind qualitative Mängel an Gussteilen, die ein Verwerfen des Gussstückes erfordern (Ausschuss) oder mit diversen Nachbehandlungsmaßnahmen so behoben werden können, dass das fehlerhafte Gussteil verwendungsfähig wird oder der Fehler gar beseitigt werden kann.
:
Die Qualitätsstellen der Gießereien entscheiden im Sinne oder mit dem Gussverbraucher über die festgestellten Fehler, die grob in Volumen- und Oberflächenfehler unterschieden werden können.
• Oberflächenfehler betreffen die Gussstückoberfläche direkt (z. B. Risse, Poren, Fehlstellen usw.) oder die Maßhaltigkeit gegenüber den geforderten Maßen (Zeichnung) vom Endprodukt.
• Volumenfehler (Hohlräume) sind oft ohne Zugang zur Oberfläche im Inneren der Gussteile als Lunker, Gefügefehler, nichtmetallische Einschlüsse und ähnlichem nur mittels Ultraschall- oder Röntgenprüfung zu erkennen.
https://de.wikipedia.org/wiki/Gussfehler

A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: gas porosity, shrinkage defects, mold material defects, pouring metal defects, and metallurgical defects.
:
The second type of defect is metal penetration, which occurs when the liquid metal penetrates into the molding sand. This causes a rough surface finish. This is caused by sand particles which are too coarse, lack of mold wash, or pouring temperatures that are too high.[25] An alternative form of metal penetration into the mould known as veining is caused by cracking of the sand.
https://en.wikipedia.org/wiki/Casting_defect

Rauhe Oberfläche
Gussfehler der bei allen, bevorzugt jedoch bei den im Sandformverfahren (s. Sandform, Sandguss) hergestellten Gussteilen, unabhängig vom Werkstoff auftreten kann.
Eine rauhe Oberfläche ist mit freiem Auge zu erkennen (Bild 1), sie tritt hauptsächlich in Anschnittbereichen und an Stellen hoher thermischer Belastung auf.
Der Fehler stellt sich in einer rauen Ausbildung der Gussoberfläche dar, wobei die Rauheit innerhalb der Größenordnung der Sandkörnung liegt. Gelegentlich findet man vereinzelt auch noch eingeschlossene Sandkörner in der Gussoberfläche vor. Rauheit führt in der Regel nicht direkt zum Ausschuß, ist aber eindeutig eine Qualitätseinbuße und wird heute vom Kunden kaum noch toleriert. Bei Sicherheitsbauteilen, die dynamischen Belastungen ausgesetzt sind, führt der Fehler zum Ausschuss.
https://www.giessereilexikon.com/giesserei-lexikon/Encyclope...

Rough surface
Casting defect which may occur with all castings, however in particular with castings produced by means of a sand casting process (s. Sand mold, Sand casting).
Rough surfaces are visible to the human eye (fig. 1); they mainly occur at sections or spots which were exposed to high thermal load.
The defect is formed by the rough structure of the casting surface with roughness being of the size of a sand grain. In some cases, there are sand grain enclosures on the casting surface. Roughness is usually no reason for reject; however it constitutes low quality and is hardly tolerated by customers nowadays. For safety components which are subjected to dynamic load, this defect results in reject.
https://www.giessereilexikon.com/en/foundry-lexicon/Encyclop...

Nature of Defect : Rough casting surface finish due to coarse sand.
Remedies : Use finer sand. Increase amount of lustrous carbon producing material in the moulding sand. Increase the amount of fines e.g. coke in the sand.
http://www.mechfoundry.com/types-of-casting-defects/

Fatigue life prediction of additively manufactured material: Effects of surface roughness, defect size, and shape
https://onlinelibrary.wiley.com/doi/abs/10.1111/ffe.12799

Analysis of Bearing Surface Roughness Defects in Induction Motors
https://link.springer.com/article/10.1007/s11668-015-0009-6

20. Fusion  Manifestation:
Surface defect.
Thin sand crusts, which firmly adhere to the casting.
Typical characteristics:
Rough cast surface. Sand sintered on the casting, which can only be removed by grinding.
https://de.slideshare.net/e_gulfam/casting-defects-49151586
(see slide 36)


Johannes Gleim
Local time: 07:33
Works in field
Native speaker of: German
PRO pts in category: 224
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