618-1802/01 – Theory of Foundry Engineering Processes II. (TSP II)
| Gurantor department | Department of Metallurgy and Foundry | Credits | 5 |
| Subject guarantor | prof. Ing. Tomáš Elbel, CSc. | Subject version guarantor | prof. Ing. Tomáš Elbel, CSc. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2012/2013 | Year of cancellation | 2020/2021 |
| Intended for the faculties | FMT | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
The student will be able as follows:
to know the rules for obtaining good casting with no defects;
to define the basic thermal and physical quantities of heat transfer in sand and metal moulds;
to apply the metal filtration aids during pouring and feeding of metal during solidification;
to solve the degasification and venting of a foundry mould.
Teaching methods
Lectures
Seminars
Individual consultations
Tutorials
Experimental work in labs
Summary
Processes taking place in a solidifying and cooling-down casting
- definition of the physical magnitudes and terms
- characteristics of heat-flow rates in a casting
- transfer of heat in a solidifying casting and in a sand mould
- determination of the time intervals of solidification of castings
- modelling of thermal processes at solidification and cooling-down of castings
- solidification of castings in metallic moulds, origination of gap between
casting and mould
- shrinkage of metals and alloys
- directional solidification
- theoretical and experimental analysis of risering
- elimination of the thermal nodal sites in castings
- filtering of melt through a double-phase zone
- segregation and liquation
- cooling-down intervals of castings
- shrinkage of castings
- stress in a casting
- consequences of stress in the castings.
Compulsory literature:
CAMPBELL, J.: Castings, Butterworth-Heinemann. Oxford, 2000.
SCHLEGG,F.P. et al. Technology of Metalcasting , AFS Publication, 2003.
Recommended literature:
STEFANESCU,D,,M. : Science and Engineering of Casting Solidification.Cluver Academic/Plenum Publishers, New York, 2002.
DANTZIG,J.A.;RAPPAZ,M. : Solidification, EPFL Oress, Boca Raton,2009
Way of continuous check of knowledge in the course of semester
One test
Two scores projects
E-learning
http://www.fmmi.vsb.cz/cs/okruhy/studium-a-vyuka/podklady-ke-studiu/studijni-opory/
Other requirements
Study subject don´t requires further requirements for student
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
1. Mould and metal coefficients in heat transfer on the metal/mould interface.
2. Thermal expansion coefficient.
3. Fuliid pressure in metals. Gating system calculation and aids. Filtering of the metal.
4. Freezing and solidification of castings in metallic mould. Air gap formation.
5. Growth of the solid. Segragation (dendritic, gravity). Thermal gravity convection
6. Macro-modelling of solidification. Physical and numerical methods.
7. Metal reoxidation in the mould cavity. Transport of gas in metal and mould cavity.
8. The angle of inner feeding channel. Directional solidification in hot spots.
9. Infiltration (penetration) of feeding metal in dendritic skeleton.
10. Riser optimalization. Feeding aids.
11. Thermal and transformation stress. Measurement and reduction of residual stress in casting.
12. The use of acoustic emission method for the study of discontinuity defects in castings.
13. The wall movement of a mould.
14. Rules to obtain the correct and conform casting.
Practice:
1st Safety Training
2nd Determination of the constant freezing (wax).
3rd Modelling of solidification thermal nodes paraffin.
4th Pouring tests on steel - chladítek influence the course of solidification
5th The temperature field of casting I
6th The temperature field of casting II.
7th Linear shrinkage - steel, aluminum alloy.
8th Linear shrinkage - iron.
9th Tensions in the casting, casting bars I.
10th Tensions in the casting, casting bars II.
11th Strength and plastic properties of steel in the solidus.
12th Acoustic emission
13th Simulation of solidification using the computer (calculating solidification basic shapes)
14th Final consultation - Credits.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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