Page 53 - UniorTools-Eng

A special procedure for the

manufacture of ratchets

Ratchet

1. Cutting: Cutting material is the "rst operation in the technological procedure to
manufacture a ratchet casing. Optimum design of a cut provides optimal use of material.
2. Forging: The forging technology at Unior ensures excellent strength properties of

wrenches. Notably, it maintains an appropriate course of "bres in a forged part, leaving them
uninterrupted and the same as in a rolled blank. That characteristic is vital for achieving the
characteristics of products typically exposed to heavy and dynamic loads, such as a ratchet.

3. Trimming: Super&uous material around a forged part is removed using a special purpose
trimming tool; material is trimmed to the desired shape, always making the weight of
trimmings as low as possible.

Ratchet casing

4. CNC working: A CNC machine is used to make a ratchet casing within the necessary

tolerance margins for optimal functioning of the "nal product.
5. Heat treatment (quenching and tempering) and sanding: The heat treatment with
hardening and tempering is intended to improve the structure of the steel, to provide greater
hardness and toughness of the product and other properties required to overcome the strain
that work with such products requires.

6. Sanding: Cleaning the surface before chroming is important for the sake of quality and
durable surface protection.

7. Chroming: A ratchet housing is plated with a thin, but hard coating of chromium oxide
that protects against corrosion and wear and other external in&uence. At the same time, it

gives the entire product a brilliant and professional appearance.

Pinion

8. Machining is carried out on a CNC machine, which ensures the necessary
accuracy. The pinion is one of the essential elements of a ratchet and individual sizes have to
be executed within very narrow tolerance margins.

9. Teeth on a pinion are shaped with a broaching operation. The obtained 75-teeth
geometry guarantees the necessary two-sided shifting of an Unior ratchet.

10. Cleaning the surface after heat treatment
11. Shift lever
12. Closing element
13. Shift button
14. Cover

15. Ejector pin: Ratchet parts 12-16 are made using advanced manufacturing procedures,
such as sintering and injection moulding. Quality materials provide optimum strength and
premium durability.

Assembly

16. Final assembly: Well quali"ed, skilled and meticulous employees performing the "nal

ratchet assembly will assemble the product into a whole ensuring a top quality "nal product.
An Unior ratchet will withstand up to 30% higher loads than standard requirements.
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