After surface hardening treatment of quenched steel gears, the surface hardness can reach more than HRC50, basically to meet the high requirements of mechanical manufacturing process on strength, hardness, wear resistance and fatigue limit, and it is with this series of excellent performance, quenched steel gears are widely used.
Just in the process of processing, high hardness, high strength, high wear resistance and other excellent performance has become a difficult processing point, although the emergence of CBN tools to optimize the machining process of quenched steel gears and improve production efficiency, but the low thermal conductivity of quenched steel gears, complex processing conditions, it is very easy to make the CBN tool chipping, abnormal wear and other situations, which requires us to the selection of CBN tool grades and the use of This requires us to have a certain understanding of the selection of CBN tool grades and the parameters of the use of CBN tools for machining hardened steel gears, in order to avoid abnormal consumption of CBN tools and unnecessary cost expenditures.
Before understanding the CBN tool grades and machining parameters, we need to know the various working conditions encountered when machining hardened steel gears.
Due to the different appearance of hardened steel gears and machining parts in different industries, we usually classify the machining conditions of hardened steel gears into three types: continuous cutting conditions, medium intermittent cutting conditions, and heavy intermittent cutting conditions.
In the processing of quenched steel gears, we need to face different processing conditions according to different processing parts, to choose the corresponding grade of CBN tools, as the so-called tool selection, efficiency doubled, today we combine field data and their own experience, an inventory of a variety of CBN tool grades suitable for quenched steel gear processing.
Grade | Process Material | Condition | Process Material | Workpiece |
BN-H11 | Continuous | Semi-Finishing
Finishing | Hardened Steel | Bearings, Gears, Gear Shaft, Hardened Mold |
BN-H20 | Semi-Interrupt | Semi-Finishing Finishing | Hardened steel | Hardened Steel Gears, Mold,ect |
BN-H05 | Continuous | Finishing | Hardened Steel | Gears, Gear Shaft, Bearings |
BN-H10 | Continuous
Semi- Interrupt | Finishing | Hardened Steel
High strength cast iron | Bearings, Gears, Gear Shaft, High hardness component |
BN-H21 | Semi-Interrupt
Heavy Interrupt | Finishing | Hardened Steel | Bearings, Gears, Gear Shaft, Mold,ect. |
BN-H05 C25 | Continuous | Finishing | Hardened Steel | Bearings, Gears, Gear Shaft, Mold, ect |
BN-H10 C25 | Continuous
Semi- Interrupt | Finishing | Hardened Steel | Bearings, Gears, Gear Shaft, High hardness components |
BN-H21 C25 | Semi-Interrupt
Heavy Interrupt | Finishing | Hardened Steel | Bearings, Gears, Gear Shaft, Mold, ect |
As can be seen from the above table, these grades of CBN tools basically cover the hardness HRC45-68, continuous-interrupted, roughing-superfinishing conditions, and can withstand a significant increase in efficiency when compared with conventional grinding in terms of tool eating depth during finishing.
The BN-H05 grade CBN tool can harden hardened steel gears under continuous cutting conditions with a surface roughness of Ra0.2, while the BN-H21 grade and BN-S20 grade CBN tools are less prone to chipping when machining faces with end holes or under strong intermittent conditions, and the above CBN tools can be used for dry cutting without adding cutting fluid, further reducing production costs.
In addition, many people know that reasonable cutting parameters, can make the tool play a better performance advantage, but also to try to avoid unnecessary tool loss, the quenching steel gear processing conditions and the applicable CBN tool grades have a certain understanding of the next we will talk about the tool parameters when processing quenched steel gears with CBN tools.
Machining material | Recommended cutting parameters | CBN insert Grade |
Cutting speed VC(m/min) | Cutting Depth ap (mm) | Feed Rate Fr(mm/r) |
Gear Hardness≥HRC45 | 50-150(Roughing) | 1-10 | 0.1-0.5 | BN-S10, BN-S20 |
90-250(Finishing) | ≤1 | 0.05-0.35 | BN-H05, BN-H10, BN-H21, BN-H20, BN-H11, BN-S200 |
Through the above data we can have a clearer understanding of the tool cutting data when processing hardened steel gears, but these data are only a reference range, the specific data settings are further determined according to the machine tool, gear working conditions, processing parts, in order to select more suitable cutting parameters, if you have questions, you can leave a message in the comments section to exchange, we discuss together .