Product Details

Grey Cast Iron Auto Brake Disc Machining By Brazed PCBN Cutting Inserts.

1.The Performance Characteristics of Gray Cast Iron.

1、Poor strength performance.

2、Hardness Characteristics:In cast iron, the ratio of brinell hardness to tensile strength is widely dispersed.For the same hardness, the tensile strength has a range.Likewise, there is a range of hardness at the same strength.This is because the strength properties are greatly affected by graphite, and the hardness basically reflects the matrix.

3、Lower Notch Sensitivity.

4、Good Shock Absorption.

5、Good Anti-Friction.Because of its low price and simple production process, it is still widely used in brake disc, brake drum, flywheel and other auto parts.It is also used in motor housing (frame) , motor end cover in the motor industry and air-conditioning compressor parts.Besides,gray cast iron is as well as used in automotive gearbox, cylinder and machine tool guide rail cutting processing.Because some of the parts of the cast iron are expendable, the demand is large, so we use machine tools to process it.

2. Advantages of BNK30 grade CBN inserts processing brake disc.

(1) BNK30 grades have high hardness and good wear resistance, which is 15 times to 20 times that of cemented carbide tools.

(2) Can withstand high-speed cutting, the highest line speed can reach 2000m / min, improve production efficiency

(3) The CBN tool adopts the method of dry cutting. It does not add cutting fluid, and the chip is easy to be recycled, which is more in line with “green manufacturing”.

3. The applications of Halnn CBN cutting tool processing auto parts.

Processing component：brake disc Processing material：HT250，HB170-210 Inserts：BN-S300 CNMN120712 Cutting parameters：ap=2mm，Fr=0.55mm/r，Vc=500m/min
Insert materials	Cutting Condition VC	Lifetime of every blade	effectiveness
Halnn BN-S300	500m/min	200pcs/blade	Increased by 1.8 times
Cemented carbide tools	180m/min	30pcs/blade	-----