Moteurs électriques pour 2 roues: Une solution complète pour l'usinage de carter des moteurs compacts
Da molto tempo oramai la elettromobilità fa parte della vita di tutti i giorni. I motori elettrici si sono diffusi tra il grande pubblico in primis nel settore delle biciclette; nell'ambito della loro produzione i relativi alloggiamenti rappresentano una vera e propria sfida, perché devono essere piccoli e leggeri ma al contempo altamente precisi.
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
もう1つの工具は、マグネシウムハウジングでのミーリング加工とドリル加工を組み合わせます。ドリルステージがベアリング穴と位置決め穴を加工している間、シール溝を加工するためにミーリングステージが使用されます。この工具の使用中にも、振動を防ぎ、切削圧を低く抑えることが重要でした。ツールのエキスパートは、歯数とミーリングステージの形状を最適に調整することでこれを実現しました。これにより溝に切り屑が入るのを防ぐことができます。
ミーリングステージの切削条件:
- 回転数 8,000 min-1
- 送り速度 7,200 mm/min
- 送り 0.15 mm
担当連絡先
担当者
Matthias Winter 市場セグメント管理自動車産業 matthias.winter@mapal.com +49 7361 585 3360