CBN tools in the turning of hardened steel gears / ball cages / ball screws / bearings

Halnn journal

Halnn CBN tools：Turning inserts for hardened steel What kind of insert is good for turning hardened steel? The specific choice of what inserts, but also need to judge according to the actual processing conditions. The following editorial from the machining allowance, processing conditions of these two aspects to introduce.

Before detailing the above two aspects, we first need to understand how to choose the right inserts. At present, coated carbide tools and CBN tools are the two more widely used materials. Coated carbide tools are covered with a layer of wear-resistant material on the surface, while the cutting edge part of CBN tools is made of CBN, which is more wear-resistant compared to coated carbide tools.

Halnn journal

Considering the production volume, for mass production, it is recommended to choose CBN tools because of their higher wear resistance. For smaller production volumes and infrequent machining, coated carbide tools are recommended. Especially when dealing with ultra-high hardness hardened steels above HRC60, it is recommended to give preference to CBN tools.

For the consideration of machining allowance, due to the different size deformation of different workpieces, the allowance of conventional parts is usually within 0.5mm. In this case, you can choose brazing CBN inserts or PCBN inserts, either one-edge or two-edge machining is feasible. Among them, BN-H20 and BN-H11 materials belong to brazing CBN inserts, which are cost-effective. On the

Halnn journal other hand, BN-H05, BN-H10 and BN-H21 materials belong to the composite CBN inserts, which are mainly designed to compete with the international first-tier brand CBN inserts. These inserts offer excellent performance, making them ideal for high standard applications.

Characteristic

Halnn CBN

Cutting depth

Cutting condition

Toughness (Roughing)

BN-S20

1-10mm

Interrupt-Continuous

BN-H20

≤1mm

Semi-Interrupt

BN-S200

≤1mm

Continuous

BN-H11

≤1mm

Continuous

BN-H05

≤0.2mm

Continuous

BN-H10

≤0.5mm

Continuous- Slight Interrupt

BN-H21

≤0.5mm

Heavy Interrupt

BN-H05 C25

≤0.2mm

Continuous

BN-H10 C25

≤0.5mm

Continuous- Slight Interrupt

BN-H21 C25

≤0.5mm

Heavy Interrupt

Hardness (Finishing) Finished hardened steel CBN tool

Finished hardened steel coated CBN tool

continuous cutting

Semi-Interrupt

Heavy-Interrupt

For large hardened steel parts, such as wind turbine bearings, wind turbine gears and other parts, the diameter is too large, the heat treatment deformation, the above

Halnn journal recommended CBN insert model can not withstand heavy cutting, then recommended BN-H200 material CBN inserts, BN-H200 material belongs to the full face CBN inserts, single-face whole are CBN sheet, can withstand heavy interrupt cutting, large and small deformation Will not make it appear tool sharp wear or broken and other abnormal phenomena.

Secondly, from the point of view of processing conditions, hardened steel processing parts are many, such as gears, gear shafts, drive shafts, bearings, wind turbine bearings, metallurgical bearings, slewing bearing bearings, ball screws, synchronizers, ball cages, three-pin shafts, cross shafts, ball cages, etc., so the processing conditions are also different, there are continuous machining, semi-interrupt machining, heavy interrupt machining, as well as heavy-duty cutting four types of machining conditions.

Among them, BN-H05 CBN inserts for continuous cutting, BN-H05 CBN inserts are well known for stable cutting, while ensuring high dimensional accuracy and surface roughness. semi-interrupt BN-H10, BN-H11 CBN inserts, cutting allowance of 0.5mm or less, can withstand semi-interrupt processing, the effect is remarkable. heavy interrupt cutting with BN-H21, BN-H200 material, the machined part has a group of holes, heat treatment deformation is large, can be used in these two types of inserts, there will be no broken phenomenon, heavy-duty cutting with BN-S20 material, the depth of cutter can be more than 2mm, an insert can be processed,

Halnn journal greatly reducing the frequency of tool change, high efficiency.

The above is from the hardened steel machining allowance and machining conditions to select the appropriate turning inserts, specific but also according to the machine tool and other information to judge, in the choice of an insert, to understand the material of the workpiece being machined, diameter, hardness, machining allowance, machining conditions, roughness requirements, dimensional accuracy requirements, machine tool equipment rigidity requirements, as well as the original use of inserts, the purpose of which is to reduce costs, improve efficiency, or improve the life of these conditions to understand in order to better recommend the appropriate insert material and type for you both price needs and ensure product quality. The purpose is to reduce costs, improve efficiency, or improve the life of these conditions to understand, in order to better recommend the right material and type of inserts for you, not only to meet your price needs, but also to ensure product quality.

Email:halnntools@halnn-group.com WhatsAPP:15515925975