1 How to ensure the parallelism of the upper and lower end when processing the brake discs?
A: As we all know, it required the parallelism of the upper and lower face when machining the brake disc. Many manufacturers will process one side first, then transfer to process the other side in the process, which is likely to cause two faces not parallel, one side thick and the other side thin. Halnn developed BN-S300 Solid CBN Inserts (following figure), using vertical CNC lathe, it can process both 2 sides at the same time to ensure the end parallelism and roughness.

2. What can we do when meet the tear problems with cbn insert finish turning brake drums?
A: When CBN Insert finish turning brake drum, the roughness began to decline because of long time grinding, the brake drum inner bore surface will appear ring with light, and when remove the brake drum hole parts, it will be easy to tear the edge of the work piece.
Halnn BN-K20 Welded PCBN insert is specially designed for finish turning brake drum.
Cutting Parameters:
Linear speed Vc=350m/min, Cutting Depth ap=0.3mm, Feed Rate:Fr=0.25mm/r
Processing effect: The lifetime is 2 times of other suppliers’ cbn insert. And also solve the tear problems.

3. How to improve the processing efficiency when processing the brake disc brake drum?
A: At present, we usually use CNC lathe machine brake disc and brake drums. High- cutting speed can be used for improving efficiency, many manufacturers have chosen carbide cutting tool machine brake disc and brake drum, but the effect is not good. In the state of high-speed turning, carbide insert wear fastly, and the roughness is not enough, which result in changing cutting tools frequently and unnecessary waste of time. Halnn Solid CBN Inserts BN-S30 can effectively solve the problem of low processing efficiency, this grade belong to non-metallic adhesive CBN Insert, which also can be used for both roughing and finishing. And the roughness can reach Ra0.8. It not only improves the processing efficiency, but also reduces the processing costs, saving processing time.

If you would like to know more about machining brake disc/drum, please kindly click https://www.halnnpcd.com/cases/PCBN_Inserts_for_Brake_Disc_Drum.html ,Or feel free to contact with us sales@halnntools.com, Whatsapp:+8613271562251