New cbn insert grade for hard turning hardened steel
Category：News
PublishedDate：2018-01-04
Hardened Steel has occupied important position in most industries because of its excellent performance. With the development of the society and widely use of CNC Center, high speed machining have become the most important methods to machine hardened steel. We will share the common questions of high speed machining hardened steel and how to solve the problems.
Part 1 Common questions when turning hardened steel
When turning hardened steel instead of grinding, the cutting tools must have the following characteristics: High hardness, Good Wear resistance and heat resistance, strong impact toughness. In current times, there are 3 types cutting tools that can be used for turning hardened steel: carbide insert, ceramic insert and cbn inserts. However in the process, it usually has the following problems:
(1) Large allowance: When hard turning hardened steel with large scale, the hardness usually is above HRC58, the deformation will be large, and has large allowance. If using carbide insert, it will wear quickly. Ceramic insert and common cbn insert only can be used for small feeds.
(2) Interrupt turning condition: Interrupt turning always is a difficult problem for the manufacturers and the cutting tools industry. Interrupt turning condition is a big challenge for high speed machining. For example, gear is one of the most important parts for the cars, and plays an important role. Some gears have oil hole, usually exists interrupt turning condition, turning instead of grinding already become a trend in modern times. It becomes a difficult problem. Carbide insert is not wearable, ceramic insert will be easily chipping, cbn insert can be used for interrupt turning end surface, but can’t make sure the position tolerance.
(3) The roughness: For example, hard turning ball screw, the ball screw belong to high precision component, the hardness is usually above HRC60, high speed machining can difficultly make sure the roughness.
From all above problems, we can see that there are mainly 2 problems
(1) Tools are not wearable (2) Tools are not impact.
For the first one situation, it mainly belongs to the problems of cutting tools materials. Normally, carbide insert is suitable for the hardened steel parts which hardness is below HRC45, Ceramic insert can be suitable for hardened steel component with continuous turning condition and hardness between HRC45~55. Cbn insert is better suitable for the hardened steel parts which hardness is above HRC50.
For the second situation, it belongs to the problems of the impact resistance, Compared above 3 types cutting tools, cbn insert will be the best choice for hard turning hardened steel.
Part 2 CBN Inserts for hard turning hardened Steel
In current times, for finish turning hardened steel, common cbn insert type is brazing pcbn insert because of its small allowance. This type brazing pcbn insert only can machine the hardened steel parts with allowance smaller than 0.5mm.
For large allowance and deformation, we need to choose solid cbn insert ( as following image).In China, Halnn is the first to propose the concept of “Solid CBN insert”, which perform well for large allowance interrupt turning hardened steel.
Part 3 Halnn New CBN inserts Grade for hard turning hardened steel
|
Insert Grade
|
Suited Materials
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Machining Type
|
Typical Application
|
Insert Image |
|
BN-S20
|
Hardened Steel, Heat and abrasive resistant steel, High manganese steel
|
Roughing, Semi-Finishing
|
HSS Rolls, Ball Screw, Wind Power Bearings
|
 |
|
BN-S200
|
Hardened Steel, Superalloy
|
Finishing
|
Wind Power Bearings
|
|
BN-H11
|
Hardened Steel
|
Semi-Finishing, Finishing
|
Bearings, Gears, Gear Shaft, Hardened Mold
|
 |
|
BN-H20
|
Hardened steel, other materials of difficult to machine
|
Semi-Finishing, Finishing
|
Hardened Steel Gears, Mold,ect
|
|
BN-H05
|
Hardened Steel
|
Finishing
|
Gears,Gear Shaft, Bearings
|
 |
|
BN-H10
|
Hardened Steel, high strength cast iron
|
Finishing
|
Bearings, Gears, Gear Shaft, High hardness component
|
|
BN-H21
|
Hardened Steel
|
Finishing
|
Bearings, Gears, Gear Shaft,Mold,ect.
|
|
BN-H05 C25
|
Hardened Steel
|
Finishing
|
Bearings, Gears, Gear Shaft, Mold,ect
|
 |
|
BN-H10 C25
|
Hardened Steel
|
Finishing
|
Bearings, Gears, Gear Shaft, High hardness components
|
|
BN-H21 C25
|
Hardened Steel
|
Finishing
|
Bearings, Gears, Gear Shaft, Mold,ect
|
If you have any problems on hard turning hardened steel, please feel free to contact with us info@halnntools.com.