Machine Forged steel cold roll with CBN inserts BN-S20
Forged steel cold roll, as one important tools for cold-rolled plate and Non-ferrous metal, and it has high hardness, strength, good ductility and impact toughness. So it becomes a big difficult problem on turning forged steel cold roll. Halnn researched BN-S20 Solid CBN inserts which can machine forged steel cold roll, through knowing about the performance of the forged steel cold roll and large quantity practices, and solved the problem.
Part 1 The reasons of forged steel cold roll difficult to machining forged steel cold roll
As the fast development of automobile, petrochemical, construction, railway and other industries, the demand for cold-rolled sheet always are rising, and because forged steel cold roll belongs to consumables, so we usually use 9Cr2Mo,86CrMoV7,Cr3,Cr5 and Cr8 as main cold roll materials. And cold rolls need hear-treatment, roughing can machining easily because of low hardness, but if semi-finishing and finishing after modulated are usually hard to cut ,and modulated part can easily deform and hardness is higher, and will be more difficult to cut. So it will have problem of non-wear-resistant.
Part 2 The CBN inserts selection and machining effect of machining forged steel cold roll
(1) For example: When machining Sweden forged steel cold roll (HRC67):BN-S20 Solid CBN Inserts cutting depth 4~7mm,linear speed 90m/min, the lifetime is 2.5 times of some international cbn inserts.
(2) When turning restored 9Cr2Mo cold work roll, we use BN-S20 solid cbn insert, also can get good effect, lifetime is more than 4 times than domestic CBN inserts ,and Chapped parts will not chapping, make sure the use safety and economy.
Part 3 Conclusion
As the Rolling steel manufacturer production rising, and strict requirement on the rolls performance, causing problems for machinery manufacturers ,and workpiece difficult to machine ,they can’t find suitable cutting tools materials ,affected the development, which is a challenge and opportunity for cutting tools industry, only researched high hardness ,high quality and high efficiency cutting tools or cutting tools materials , can get a place in tool industry and promote the development of machines.
Remark
(1) Use Halnn BN-S20 Solid CBN inserts , choose reasonable inserts angle can shorten the processing time and improve the work efficiency.BN-20 Solid CBN inserts, compared with Halnn other CBN inserts grades, has the best toughness and can cut at a brisk 0.2 * 20 degree chamfer, and can restore irregular surfaces of forged steel cold roll .
(2) Choose reasonable tools angle and cutting parameters (turning instead of grinding or roughing quenched steel cold roll), Correct operations can solve the cutters crack problem of forged steel cold roll .