PRODUCT DETAIL

The most common material for brake drums is gray cast iron, with a small number of materials being alloy steel and ductile iron.

The gray cast iron grades used in automobile brake drums mainly include: HT250/HT300, G3000, FC250,/FC300, GG25/GG30.

Brake drums need to withstand high-frequency friction and high temperatures, and are usually made of gray cast iron as the main material because of its good wear resistance, thermal conductivity and shock absorption, making it suitable for frequent braking scenarios.

The solid CBN insert enables "roughing and finishing in one" machining process, completing multiple steps in one clamping, and is suitable for lathes or dedicated machining centers.

For brake drums, SCBN TOOLS has introduced the cost-effective SBN950 & SBN850 grade. 

SBN950: This grade offers long life, high precision, and excellent value, perfectly matching the efficient machining needs of gray cast iron brake drums, providing manufacturers with a solution that combines performance and cost advantages.

SBN850: Drawing on years of research and development and accumulated application experience, SCBN TOOLS has launched the new "SBN850" grade. Designed specifically for high-speed machining of cast iron used in high-volume automotive production, this grade offers excellent wear resistance, deep-cutting capability, and a multi-edge design for improved productivity and cost-effectiveness.

SCBN can recommend suitable grades according to the customer's specific working conditions.

Common brands and models for machining gray cast iron brake drums: CNGN120712 / CNGN120716,WNGN0804/WNGA0804.

SCBN TOOSL Solutions: machining inner diameter brake surface

SCBN TOOSL Solutions: machining braking surface inner hole

Advantages of using solid CBN inserts for brake drum machining:

 1. Higher efficiency: Cutting speeds reach 800-2000 m/min, reducing single-process time by over 30%;

 2. Longer tool life: 5-10 times that of carbide and 2-3 times that of ceramic inserts, reducing tool change downtime;

 3. More consistent quality: Dimensional error ≤ 0.01mm, surface roughness Ra1.6-3.2μm, burr-free;

 4. Greater adaptability: Suitable for dry cutting, resistant to high-hardness materials and interrupted cutting, and superior impact resistance;

 5. Lower overall cost: the tool cost per workpiece is lower, making it suitable for mass production.