618-2022/01 – Foundry Molds and Molding mixtures (SFaFS)
| Gurantor department | Department of Metallurgy and Foundry | Credits | 5 |
| Subject guarantor | Ing. Jaroslav Beňo, Ph.D. | Subject version guarantor | doc. Ing. Petr Lichý, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 3 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2014/2015 | Year of cancellation | 2021/2022 |
| Intended for the faculties | FMT | Intended for study types | Bachelor |
Subject aims expressed by acquired skills and competences
Acquired knowledge:
- student will be able to characterize individual technologies for molding and core mixture manufacture
- student will be able to define basic methods for testing of molds and cores mixtures together with their regulation based on their physical – chemistry and technological properties.
Acquired skills:
- student will be able to predict mutual interactions of sand – binder system
-student will be able to apply their theoretical knowledge in order to control quality of molding mixture in relation to selected technology
Teaching methods
Lectures
Individual consultations
Tutorials
Summary
The subject is focused on theoretical and practical aspects of moulding mixtures manufacture and control. The attention is devoted to mutual interaction of sand – binder system and to individual technologies of moulds and cores manufacture.
General methods of testing and control of moulding mixtures is also presented here.
Compulsory literature:
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
E-learning
http://www.fmmi.vsb.cz/cs/urceno-pro/studenty/podklady-ke-studiu/studijni-opory
Other requirements
Elaboration of semestral projects and completion of the interim tests
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Moulding and core mixtures. Basic components of moulding mixtures, their definition and classification. Basic characterization and division of sands. Evaluation of quality of natural and artificial sands
2. Silica sands, physical – chemistry properties, disadvantages of silica sands and their elimination
3. Artificial sands. Classification, general characterization and possibility of their utilization. Structure of moulding mixture. Porosity and permeability of moulding mixtures
4. Thermo-physical properties of moulding mixtures. Specific surface area, methods of its determination, Coefficient of angularity and its influence on technological properties of moulding mixture
5. Activation of sand grains. Reclamation of sands, methods and evaluation of quality reclaim
6. Binder systems of the I.-IV. Generation, general characterization. Clay binders of foundry technology. Role of water in clay minerals. Bentonites
7. Activation of bentonites. Changes of bentonite binder after thermal exposition. Control of green sand systems
8. Additives of green sand system. Carriers of Pyrolysis Carbon. Other additives of green sand systems.
9. Chemicization of mould and core manufacture. Binder system of the II. Generation – alkali silicates, general characterization. Methods and principles of alkali silicates curing
10. CT – and ST – mixtures with alkali silicates. CO2 – process. Self-setting mixtures with liquid hardeners. Problems with collapsibility of mixtures with water glass
11. Binder systems of the II. Generation based on organic resins. Moulding and cores mixtures based on phenol – formaldehyde resins. Croning method. HOT-BOX method and its versions. Gisag COLD-BOX method (No - bake )
12. Moulding and cores mixtures based on furan resins. Self-settings mixtures with catalyst. Self-hardening mixture (SO2 – process), Resol – CO2 process
13. Chemistry of polyurethane binders. Alkyd-oil polyurethanes. Phenol polyurethanes. Methods of core manufacture PUR COLD-BOX, PEP-SET. Saccharide binders and additives.
14. Binders systems of the III. And IV. Generation, application of physical and biological ways of binding for mould manufacture.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction