Halnn CBN tools roughing high manganese steel parts

High-manganese steel is wear-resistant steel. The manganese content is usually between 10% and 18%. M13, M17, and M17 are common high-manganese steel materials. Applications of high manganese steel include quarrying, mining, excavation, coal industry, foundry, and steel industries. Typical parts are cone crushers, High Manganese steel Liner, High Manganese steel Roller, High Manganese steel Guard, plate hammer, hammerhead, etc.

High manganese steel is a commonly used wear-resistant steel in machinery industry, these wear partsusually have excellent performance: high strength, high toughness, high wear resistance, but the machinability of high manganese steel is poor, it mainly has the following difficulties:

Plastic deformation, severe processing hardening

Large plasticity, easily to form BUE

Large cutting force, high toughness, not easy to break

Due to the large cutting force, the unit cutting power increases, the heat generated per unit time and high manganese steel itself poor thermal conductivity, the cutting zone temperature up to 1000 ℃, severe tool wear, tool life is low.

Common used tool holder and CBN inserts for high manganese steel

Machine tool: CNC vertical lathe

Tool holder: 83°CSXNR/L or 75°CSRNR/L

CBN grade: BN-K1 and BN-S20

CBN type: SNMN150716, SNMN120716, RNMN200800

Advantages: Large margin cutting, cutting depth up to 7.5mm, reducing work hardening and improving production efficiency

Common CBN Inserts Models For Manganese Steel Machining

CBN Inserts Models: SNMN150716, RNMN200800

Halnn CBN Grade:

BN-K1(0701):Excellent toughness, wear resistance not well

BN-K1(0308) balance performance

BN-S20 & BN-S200(small inserts),Excellent wear resistance, toughness not well

Recommend Cutting Parameters:

Roughing: ap=5-6mm; Fr=0.4-0.6mm/r; Vc=45-75m/min

Finishing: ap=1-2mm; Fr=0.3-0.5mm/r; Vc=60-100m/min

How can adjust the parameters when the failure mode is not normal?

If the inserts is easily crack, you should make

(1) smaller Fr. (2)Smaller ap (3)Smaller Cutting Speed.

Fr: When the feed rate is too big, the insert will easily crack.

Ap: When Ap>the insert thicknss, the insert will eacily crack

Vc: When Vc is too big, the holder will be easily vibrate, which will make the insert crack.

Application case

	Workpiece: Crushing Cone
	Material: High Manganese steel
	Insert Type: BN-K1 SNMN150716
	Cutting parameters: ap=2.5mm, Fr=0.5mm/r, Vc=85m/min
	Processing method: dry cutting
	Insert grade	Cutting speed	Efficiency	Tool Life/edge
	Halnn BN-K1	85m/min	15min/pc	2pcs
	Carbide Inserts	20m/min	65min/pc	0.5pcs