SPRINGS

Sintered aluminium oxide abrasive grains by Theleico company consist of microcrystallites with particle sizes in the sub-micron range.

Permanent self-sharpening

The microstructure which is present in each grain causes permanent liberation of micro cutting edges, dependent on the grinding pressure, and hence “self-sharpening” of the abrasive grain. The grinding wheel remains permanently sharp. Besides spring end grinding, these extraordinary advantages are also to be observed in standard applications such as cylindrical grinding, surface grinding and internal grinding of hardened and high-alloy materials.
In this connection the use of sintered aluminium oxide grinding wheels has partly proven even more economical than using the super abrasives CBN and diamond, which are much more expensive.

Clear advantages in grinding behaviour

When compared under the same conditions sintered aluminium oxide shows clear advantages over conventional aluminium oxide regarding abrasion and self-sharpening of the grain.

Lower grinding pressure, longer wheel life

With respect to sintered aluminium oxide abrasives the splintering of the abrasive grain occurs at considerably lower grinding pressures. Due to the essentially smaller crystallites lower grain proportions are removed unused from the process which increases wheel life considerably.

Cool grinding operation, higher cutting speed

The peripheral cutting speed of about 35m/s, which is normally used today, is primarily design rated for controlling the developing process heat. By using Theleico sintered aluminium oxide grinding wheels with their distinctly cooler grinding operation, it is possible to increase peripheral speed up to 50m/s, thereby achieving a further increase in cutting performance.

Better grinding quality, not harmful to the environment

Permanent self-sharpening, lower grinding pressures and higher peripheral speeds result in an improved surface roughness with low burr formation an the springs ground. Moreover, the disposal of the cut and extracted material is simplified. The proportion of grinding wheel abrasion is minimised and the collected grinding dust can be melted back down again without difficulty.

Theleico offers tailor-made grinding wheels for specific requirements in sintered aluminium oxide

vitrified bond
resin bond, with perforated grinding face, in compact design
to fix by bolts
glued to steel plates,
and in CBN design, Diamond design
– galvanic bond
– vitrified bond

Effective cost reduction

A comparison of time needed for grinding absorbing springs makes clear that the use of sintered aluminium oxide wheels is more economical than the use of conventional wheels (178 – 198 springs [CrSi-steel] in the loading plate, automatic feed, wire diameter 3.6 – 4.8mm, metal removal rate/spring 3.0 – 5.8g:
Conventional alu. oxide:
grinding time/loading plate 200s
dressing frequency 30
wheel change frequency 4
machine running time 153.2h
Sintered alu. oxide
grinding time/loading plate 140s
dressing frequency 5
wheel change frequency 2
machine running time 102.4h

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