Many auto parts factories, especially those in the new energy vehicle sector, face burring on the back side of holes when drilling aluminum alloy bumpers. I have three solutions that can eliminate the need for manual deburring, saving significant labor costs and improving efficiency. 

First, let's analyze the typical locations where burrs frequently occur:

1.Burrs on the flare of intersecting holes.

2.Burrs at the exit of through-holes.

3.Burrs at the entry point of the drill.

For shallow holes, you can try a flat-bottom drill bit (also called a flat-head drill bit), which we have in stock. Why is a flat-bottom drill bit suitable for shallow holes? Because it has greater resistance than a normal drill bit, and the feed rate will be much smaller. Therefore, it is generally not recommended for depths exceeding 2 times the diameter. It's not suitable for mass production of deep holes.

For deeper intersecting holes, some might use two types of drill bits. First, they use a pointed drill bit, leaving some material, and then, just before breaking through, a flat-bottom drill finishes the operation. This method also reduces burrs. However, we recommend using just one drill bit: with a pointed drill, we can keep the RPM constant while slowing down the feed rate just before completing the through-hole, which will significantly reduce the amount of burrs.

Finally, for deep holes in mass production with burrs, if you want to reduce burrs, Changzhou QT TOOLS can help you customize a low-burr drill bit. It's also a pointed drill, but it has a special treatment near the drill tip that acts as a buffer. This reduces the impact force at the moment of breakthrough, thereby minimizing burr formation.

Follow Changzhou QT TOOLS to learn more about tool usage and avoid detours!