Movilidad eléctrica: soluciones para carcasas de motor pequeñas
Hace tiempo que la movilidad eléctrica ha llegado a la vida cotidiana. En este contexto, los accionamientos eléctricos se han dado a conocer al público general en primer lugar a través de las bicicletas. Durante su producción, unos de los retos principales está relacionado con la carcasa del motor: debe ser pequeña y ligera pero, al mismo tiempo, también muy precisa. MAPAL ofrece un paquete completo para el mecanizado de carcasas pequeñas.
Most manufacturers of small electric motors manufacture their motor housings from diecast aluminium - more often than diecast magnesium. The housings are very thin-walled, unstable and therefore prone to vibration. Multi-level contours within the housing provide space for the various functional motor components. The geometrical and dimensional requirements are high - tight form, running and position tolerances are specified.
Over the past decades, MAPAL has gained extensive experience in the machining of small motor housings made of both aluminium and magnesium, for example housings for chainsaws, mopeds or lawnmowers. However accuracy requirements have increased yet again with electrification.
MAPAL offers an all-round package for the machining of small housings made of aluminium or magnesium. First and foremost, PCD and solid carbide tools are ideal for machining both materials. The tool manufacturer designs the best concept including all tools and chucks depending on the requirements and complexity. Combination tools, each covering several work steps, make the process more economical.
Over the past decades, MAPAL has gained extensive experience in the machining of small motor housings made of both aluminium and magnesium, for example housings for chainsaws, mopeds or lawnmowers. However accuracy requirements have increased yet again with electrification.
MAPAL offers an all-round package for the machining of small housings made of aluminium or magnesium. First and foremost, PCD and solid carbide tools are ideal for machining both materials. The tool manufacturer designs the best concept including all tools and chucks depending on the requirements and complexity. Combination tools, each covering several work steps, make the process more economical.
PCD tool machines bearing and position bores on magnesium housing
Strong vibrations in particular present a challenge when machining bearing and position bores on a specific magnesium housing because the component is extremely thin-walled in the area of the third bearing bore. The tool must remove 0.6-1 mm of material from the pre-cast bores.
The following parameters must be observed:
The following parameters must be observed:
- Roundness < 0.01 mm
- Diameter tolerance IT7
- Average roughness depth Rz < 10 µm
For this, MAPAL designed a complex, multi-step PCD combination tool which machines the three bearing bores and the bearing seat position bore in one shot - reliably and within the required tolerances.
The tool works with the following cutting data:
The tool works with the following cutting data:
- Spindle speed 8,000 rpm
- Feed rate 3,200 - 4,800 mm/min
- Feed 0.1-0.15 mm
Drilling and milling combined in a single tool
Another tool combines milling and drilling on a magnesium housing. While drilling steps machine the bearing bore and the position bore, a milling step is used to produce the sealing groove. It was also important for this tool to prevent vibration and keep the cutting pressure low. The tool experts achieved this by optimally coordinating the number of teeth and the geometry of the milling step. This also avoids chips in the groove.
Milling step cutting data:
Milling step cutting data:
- Spindle speed 8,000 rpm
- Feed rate 7,200 mm/min
- Feed 0.15 mm
Your direct contact
Contact person
Matthias Winter Department manager matthias.winter@mapal.com +49 7361 585 3360