Home-immediately access 800+ free online publications. Download CD3WD (680 Megabytes) and distribute it to the 3rd World. CD3WD is a 3rd World Development private-sector initiative, mastered by Software Developer Alex Weir and hosted by GNUveau_Networks (From globally distributed organizations, to supercomputers, to a small home server, if it's Linux, we know it.)ar.cn.de.en.es.fr.id.it.ph.po.ru.sw

CLOSE THIS BOOKHammering and Marking - Course: Technique for manual working of materials. Trainees' handbook of lessons (Institut fr Berufliche Entwicklung, 17 p.)
VIEW THE DOCUMENT(introduction...)
VIEW THE DOCUMENT1. Purpose of hammering and marking
VIEW THE DOCUMENT2. Tools and accessories
VIEW THE DOCUMENT3. Working principle of hammering
VIEW THE DOCUMENT4. Working techniques of hammering
VIEW THE DOCUMENT5. Working technique of marking
VIEW THE DOCUMENT6. Labour safety recommendations

3. Working principle of hammering

The impact of the hitting hammer face is transmitted through the workpiece to the strong, inflexible support which is repelling the blow.

The material gets compressed - it cannot yield in the direction of the blow.

It yields to two or more sides, depending on the shape of the hitting hammer head and on the shape of the hammering support, with such shapes getting impressed into the surface of the workpiece.


Figure 14 Effect of hammer pane and hammer face

Notes

- Ductile materials can be hammered only - brittle materials cannot be formed by hammering!

- The more hammer blows, the faster hardening and the harder the material!

- In case of extensive forming operations the hardness is to be reduced by “annealing” and “cooling down”!

- Sheet steel is to be cooled down gradually in the air after annealing - sheet copper is to be quenched in cold water immediately after annealing!

To ensure maximum hitting accuracy, the blow of the hammer should be directed from the wrist joint.

More powerful blows for heavy forming work should be directed from the shoulder joint.

What is the working principle of hammering?

_______________________________________________

What property must materials have that shall be hammered?

_______________________________________________

What is the effect of many hammer blows hitting one point of the workpiece?

_______________________________________________

How can that effect be reduced or eliminated?

_______________________________________________

TO PREVIOUS SECTION OF BOOK TO NEXT SECTION OF BOOK