1 / 9

Castings Defects: Understanding Types and Causes

Learn about different types of castings defects in engineering technology, such as slag inclusions, structure precipitation, babbles, cast tearing, segregation, and residual stress. This tutorial also covers faults initiated at the forming stage. Gain insights into identifying and preventing defects in castings.

bluma
Download Presentation

Castings Defects: Understanding Types and Causes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering technology Topic: Castingsdefects Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Castings defects

  3. Castings defects • Defects are divided according to activity where they originated: • Defects at casting and solidifying • Forming defects

  4. Castings defects Defects at casting and solidification • Slag inclusions – At casting slag has not been retained -> surface faults, inner defects

  5. Castings defects • Structure precipitation – Casted material does not solidify equally (solidification goes from outside to inside) -> on a thicker walls maybe created cavities, -> called shrinkages (these will not happen if the casting walls are of equal thickness). • Babbles in casting structure – Wet forming sand releases hydrogen and oxygen at the cast temperature and if not properly removed the gasses will enter the structure of • the casting

  6. Castings defects • Cast tearing – Diameter of transitions have been constructed too short (solidification of thicker parts have been slower) -> a bigger metal cooler parts are inserted into moulds with bigger diameter -> managing of cooling process • Segregation – Starts segregating of casted parts at solidification and uneven distribution of alloying parts -> different properties of material inside and outside of the cast.

  7. Castings defects • • Residual stress– Shrinkage cavity is hollow parts initiated at the cooling process.

  8. Castings defects • Faults initiated at forming • Offset, reject casting – Is caused if forms don’t matched exactly • Edge or oval thickening – if the form is not sufficiently rammed -> hydrogen and oxygen recede under the casted material pressure.

  9. Used literature • strojirenstvi.studentske.cz/2008/10/kontrola-vady-odlitk.html

More Related