Small e-motor housings
Example e-bike drive
Electrified mobility has long since found its way into everyday life. The general public was first introduced to electric drives on bicycles. The motor housings, among other things, pose a challenge in their production – they have to be small and light and at the same time highly accurate.
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.
FEATURES
- Two-part or three-part (housing and cover)
- Die-cast housings made of aluminium or magnesium
- Unstable, thin-walled components (susceptible to vibration)
- Multi-stage contour paths
- The geometrical and dimensional requirements are high (shape, running and position tolerances)
MACHINING REQUIREMENTS
- Roundness < 0.01 mm
- Diameter tolerance IT7
- Average roughness depth Rz < 10 μm
PKD-刀具在镁壳体上加工轴承孔和位置孔
在镁壳体上加工轴承孔和定位孔时，因为第三个轴承孔范围内的部件壁非常薄，首先面临着出现强烈振动的挑战。该刀具必须在预制孔上切出0.6-1 mm 的材料。
必须遵守下列参数：
圆度 < 0.01 mm
直径公差 IT7
平均粗糙度 Rz < 10 µm
MAPAL 公司为此设计了一把复杂的、多级聚晶金刚组合刀具，该刀具可在一次装夹中完成3个轴承孔和轴承座定位孔的加工 – 并确保在要求的公差内具有很高的工艺安全性。
该刀具采用下列切削数:
- 转速 8,000 min-1
- 进给速度 3.200 - 4.800 mm/min
- 进给量 0.1-0.15 mm
一把刀具将钻削和铣削过程合二为一
另一把刀具在镁壳体上组合钻孔和铣削加工。在钻轴承台阶孔和加工定位孔期间，为了加工密封槽而采用铣削工序。在使用该刀具时也要注意，尽量要防止产生振动并保持尽可能小的切削力。刀具专家通过最佳地协调台阶铣刀齿数和需要切削的几何形状最终完满的达到了这样的加工结果。由此而避免了切屑在槽中的堆积。
铣削工序的切削数据：
- 转速 8,000 min-1
- 进给速度7,200 mm/min
- 进给量0,15 mm
玛帕公司为铝或镁材料小型电机壳体的切削加工提供了全方位解决方案。
首先，PCD- 和全硬质合金刀具是最适于切削加工这两种材料的极佳之选。根据具体要求和复杂性的不同，玛帕作为刀具生产厂家可以设计并提供包括所有刀具和卡盘在内的相应匹配方案。结合多个工序组合刀具的提供，通过使用玛帕公司的产品使得在此领域的加工工艺流程具有特别高的性价比优势。
