Solid CBN inserts for turning high manganese steel/high chromium cast iron

Material of high manganese steel and high chromium cast iron

High manganese steel material name: ZGMn13, M17, M18, M13

High chromium cast iron material name: Cr15Mo3, Cr15Mo2Cu, KmTBCr12 , Cr20 ,  Cr26, cr27.

Common component names of high chromium cast iron/high manganese steel

Common parts of high chromium cast iron: cast iron roll, slurry pump (impurity pump, mud pump, water pump) pump body, impeller, guard plate, mud pump cylinder liner

Common parts of high manganese steel: rolling face wall and crushing wall of cone crusher, fork plate of jaw crusher, lining plate of ball mill, plate hammer, hammer head, etc.

The hardness of high chromium cast iron reaches HRC60 degrees, especially for large casting rolls, slurry pumps and other casting defects (sand inclusions, pores). High manganese steel has serious work hardening, large cutting force and high cutting temperature, and the tool is easy to wear quickly.

Solid CBN Inserts for rough turning of high chromium cast iron/high manganese steel are available in BN-K1 and BN-S20 materials. They are ideal cutting tools for machining high-hardness materials. Which tool should be selected under specific circumstances depends on the actual processing site conditions. But the use of cutting fluid is prohibited, and the dry cutting method is more reasonable to avoid uneven supply of cutting fluid, resulting in abnormal scenes such as blade cracks and chipping.

For the specific performance of BN-K1 material and BN-S20 material, see the following table:

 CBN inserts for Rough Turning of High Chromium Cast Iron/High Manganese Steel

Commonly used in high chromium cast iron are the solid CBN Inserts: SNMN120712, SNMN120708, CNMN120412, RNMN120400, SNMN120412

solid CBN Inserts commonly used for roughing and finishing high manganese steel: SNMN150716, SNMN120716, RNMN200800

Tool holder for turning tool: 25*25, 32*32, 40*40

High-chromium cast iron is a kind of high-hardness, high-strength, high-alloy white cast iron with wear resistance and corrosion resistance. As a wear-resistant casting, the hardness of high-chromium cast iron is generally above hrc45, and the tensile strength is 650--850mpa. However, this material is hard and brittle, and the cutting state is extremely unstable, so it is difficult to cut.

4. Take cutting high chromium cast iron industrial pump parts as an example:

Processing material: high chromium white cast iron Cr26

Processing parts: wear-resistant and corrosion-resistant industrial pump impeller, pump body, etc.

Material hardness: 60HRC

Tool material: BN-K1

Cutting parameters: Ap=3.5mm, Fr=0.1mm/r, Vc=75m/min

Cutting method: dry cutting.

Results: BN-K1 grades had a single edge life that was more than seven times that of ceramic inserts at twice the cutting speed and 40% greater feed rate than ceramic inserts.

5. Take the turning of high manganese steel cone crusher wear parts as an example

Workpiece material: ZGMn13 (uneven casting blank)

Tool material: BN-S20

Cutting tool amount: Ap=7.5mm; Fr=0.3mm/r; Vc=80m/min

Dry cutting.

When rough turning, take αp =6～10 mm; cutting length Fr=0.25-0.8mm/r; cutting speed v=85m/min; αp=1～3 mm when semi-finishing; f=0.2～0.4 mm/ r; ap≤1 mm during finishing; f≤0.2mm/r; cutting line speed v=135m/min, tool durability: 3 hours/edge! The blade can be rotated 8 times to 12 times, and one blade can be used for three shifts. It can be seen that the use cost of BN-S20 material tools has great advantages compared with other tool grades.

Using BN-K1 material and BN-S20 material for rough turning of high-chromium cast iron/high-manganese steel will not chip or break. Compared with cemented carbide and ceramic tools, it is more impact-resistant and has more stable cutting performance. Ideal machining tool for chromium cast iron/high manganese steel.