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PCBN inserts for interrupted machining

With the development of industry, more and more hardened steel parts are widely used in industrial processing, such as gears, bearings, ball screws, ball cages, etc., which are all common hardened steel parts. Hardened steel refers to the hardness of steel parts after heat treatment, reaching HRC45 or more, and some reaching HRC68. Generally, continuous processing is difficult to process, and intermittent processing is a big problem. So what kind of CBN insert should I choose when cutting hardened steel parts intermittently?

Due to its high hardness and excellent toughness, CBN inserts are the first choice for interrupted cutting of quenched steel, so how to choose a suitable insert grade for interrupted cutting of quenched steel?

SCBN TOOLS has decades of experience in the superhard tool industry, and has developed several CBN inserts for interrupted cutting quenched steel for different processing procedures. The grades are as follows:

Common models of hardened steel inserts for interrupted cutting are:

When finishing hardened steel, interrupted cutting and small allowance, tipped PCBN inserts CNGA1204, TNGA1604, CCGW09T304, WNGA0804, etc. are commonly used

When semi-finishing hardened steel, interrupted cutting, and large allowance, solid PCBN inserts CNMN1204, SNMN1204, etc. are commonly used.

Intermittent cutting hardened steel gear processing case:

1. Interrupted cutting quenched steel gear inner hole---SBH170

Workpiece name: gear

Workpiece material: SCr420H

Selected tool: SBH170 DNGA1504

Cutting parameters: ap=0.2mm Fr=0.05mm/r, Vc=150m/min

Machining effect: In the case of obtaining the same surface quality Ra1.2 at the same cutting speed,

Processing life:

A CBN insert in China has a lifespan of 50 pieces/edge

SCBN TOOLS SBH170 CBN insert life is 75 pieces/edge

Advantages: Compared with Japan CBN inserts, the machining efficiency of SCBN Tools SBH170 is increased by 30%.

2. Strong interrupted cutting hardened steel gear end face---SBH190

Workpiece name: Gear (with group holes on the end face)

Workpiece material: 20CrMnTi, HRC58~63

Machining process: heavy Interrupt turning gear end face

Selected tool: SBH190 CNGA120408

Cutting parameters: Vc=100m/min, ap=0.1mm, Fr=0.03mm/r

Advantages: The tool life is 2 times that of other CBN tools for finishing gears, and it does not break down in intermittent machining conditions, and ultimately normal wear

Interrupted cutting is also common in large castings. When there are casting defects, it is easy to form interrupted cutting. In this case, the interrupted machining material of the solid CBN insert can be selected.