Anglicky v odborných předmětech "Support of teaching technical subjects in English “

1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering technology Topic: Volumeforming – hammerforging 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. Volume forming– hammer forging

3. Volume forming – hammer forging • Free forging • Anvil • Anvil path

4. Volume forming – hammer forging • Anvil’s top swage is smooth and hardened

5. Volume forming – hammer forging • Free (smith) forging is divided on: • 1. Hand • 2. Machine • Hand forging uses hand forging tools on anvil. • For smith / hammer forging is used different machines, namely power hammer and presses.

6. Volume forming – hammer forging • Steel hearth – fuel is black coal or coke • Smith’s hammers

7. Volume forming – hammer forging • Hammers are made from steels with Carbon content – C 0,7 to 1%. • Both sides of hammer are hardened. • Recessed/stepped hammers have hardened only surface.

8. Volume forming – hammer forging • Type of smith hammers – recessed hammers • SharpSet (flat) hammer • Profiled hammerFore (Sledge) hammer

9. Volume forming – hammer forging • Black smith tongs – are adapted to the shape of holding material. • Tongs main parts: • Jaws • Lock • Handle • Smith tongs • “Wolf jaws“

10. Volume forming – hammer forging • Forging temperatures in Fe – Fe3C diagram

11. Volume forming – hammer forging • Basic forging operation at hand forging: • 1. Extension • 2. Smoothing / planishing • 3. Shouldering • 4. Ramming • 5. Bending • 6. Punching • 7. Black smith welding

12. Volume forming – hammer forging • 1.Extension (Length forging, drawing). It is the most used operation. • 2. Planishingis provided by material hammering onto set hammer.

13. Volume forming – hammer forging • 3. Shouldering is rod thinning in given length • Shouldering is done on rod’s one or both sides.

14. Volume forming – hammer forging • 4. Ramming – strengthening of semi-product.

15. Volume forming – hammer forging • Forged welding – is the oldest type of welding. • Forged welding is done at temperature of 1300 deg. C (white heat / incandescence). • Welding is called ‘butt weld’ (short rods of dia. 15mm) or overlapping.

16. Answer questions • How is ‘smith forging’ divided? • Name forging tools. • Name hammer types? • Name basic black smith works. • What temperature is used at forged welding? • What is used at machine forging?

17. Answer questions: • Explain forge extension. • Explain smoothing. • Explain shouldering. • Explain ramming. • Explain bending. • Explain cutting. • Explain punching.

18. Used literature • http://www.ksp.tul.cz/cz/kpt/obsah/vyuka/skripta_tkp/sekce/03.htm • Strojírenská technologie, Otakar Bothe,1980