As we all know, the hardness of quenching steel workpiece is high, and difficult to machine, especially for interrupted turning condition, so the requirements on the cutting tools materials improve gradually.
In current times, the materials of machining quenching steel include carbide alloy, ceramic and CBN Insert, but because of high hardness of quenching steel, it only suit for CBN inserts.
Quenching steel workpiece usually belongs to finish turning after heat-treatment, has small working allowance, and it will be more economical with brazed CBN inserts. But some quenching steel exist interrupted turning condition, such as turning key seating or oil hole on the surface of the workpiece. In the process, CBN inserts are easily chipping, so many manufacturers are difficult to guarantee the precision and durability for interrupted turning quenching steel.
But as the manufacturing required product quality increase gradually, it not only require the workpiece high precision, but also require product quality improved. Quenching steel, as one of the most common parts in manufacturing is the most important factor which cutting tools enterprise need value.
Halnn Superhard,as a professional CBN inserts manufacturer, has good development in the following areas: high hardness cast iron/steel, high hardness steel after heat-treatment, cast iron, ect. And since Halnn superhard established, it always are keeping up with the pace of the manufacturing. Halnn also has high reputation in the interrupted cutting field.
Nowadays, as the increase of quenching steel interrupted cutting condition workpiece, Halnn seized the opportunity, first researched BN-H21 PCBN inserts which can interrupt turning quenching steel workpiece, and already has good development in gear industry.
The following is the cutting parameters and inserts work efficiency from one of our customers.
1.Workpiece information:
Name:Gear
Hardness: HRC53~61
Other information: φ97.02, Depth30mm
Process: Finish turning inner hole
Machining condition: Mid-interrupted turning
Precision requirement:Ra1.6
Tolerance: +0.02
0
2.The parameters of BN-H21 CBN cutting Tools interrupt turning gear inner hole
Inserts model:BN-H21 CCGW09T304-2S
Cutting Parameters:N=500r/min;ap=0.08~0.12mm;Fr=0.08mm/r
Cutting Type: Dry Cutting
Machine effect: Each edge can machine 180~200piece workpiece, and continue working about 3 hours. And guarantee the tolerance and precision requirement, and approval by customers.