The Application of BN-S20 CBN Inserts in Processing HSS Rolls

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The Application of BN-S20 CBN Inserts in Processing HSS Rolls At present, the high-speed steel mill rolling, also known as the high carbon high-speed steel composite mill rolling, is being applied more and more in the steel mill rolling industry with the transformation and upgrading of the steel mill rolling industry. The hardness often reaches HRC60 or above, which puts higher requirements on the efficiency and service life of cutting tools.

BN-S20 CBN inserts are widely used in the field of high-speed steel rollers due to their high hardness, wear resistance and impact resistance.

The article mainly introduces the advantages of high-speed steel rollers and the application of BN-S20 CBN inserts in processing high-speed steel rollers.

1、The advantages of HSS rolls High speed steel mill rolling is a hot mill rolling material that has a relatively short history, rapid development, and broad application prospects. High speed steel, also known as hardened steel, means that it can harden even when cooled in air during

Halnn journal quenching. It is a complex alloy steel containing elements such as tungsten, molybdenum, chromium, and vanadium. Its advantages lie in:

High speed steel rollers have a high carbon content and contain alloy elements such as chromium, molybdenum, and niobium. The carbides have high hardness and good wear resistance; High speed steel rollers have good thermal stability; High speed steel rollers have good harden ability, ensuring that the rollers have the same good wear resistance from the outside to the inside.; High speed steel materials have a high coefficient of expansion and good thermal conductivity; 2、Selection of machining tools for high-speed steel rolls High speed steel rollers belong to hot rolled steel, with a hardness generally between HRC45-62. First, 3mm removal allowance must be kept for finish after rough processing. Then precision machining is carried out to meet the requirements of the drawing and surface roughness. If high surface roughness is required, a removal of 0.2-0.5mm shall be left for precision machining and grinding.

Due to the high hardness of high-speed steel rollers and their casting process, there is a high possibility of casting defects (unevenness, hard spots, porosity, sand inclusion, etc.) on the surface of the workpiece. How to choose suitable materials for tools is very important.

Because of the high hardness of high-speed steel rollers and the difficulties in machining, traditional cutting tools cannot get high productivity. Later, with the

Halnn journal emergence of superhard cutting tools, the issue was effectively solved. BN-S20 CBN inserts are made entirely of CBN material and belong to the category of polycrystalline CBN cutting tools. They not only achieve large cutting allowances, but also have excellent wear resistance. And the tools life is several times when comparing with traditional cutting tools.

3、Advantages of BN-S20 CBN inserts in processing high-speed steel rollers The advantages of BN-S20 CBN inserts include: ① high hardness and wear resistance, avoiding frequent tool changes and affecting production efficiency; ② Excellent impact toughness and fracture resistance. It is suitable for rough turning high-speed steel rollers by large removal allowance; ③ Good heat resistance. The CBN tip could withstand a large amount of heat during the processing of high-speed steel rollers. So, the abnormal phenomena such as rapid wear will not occur; ④Dry machining reduces total production costs and ensures a good working environment.

4、Cutting parameters of BN-S20 CBN inserts in processing HSS rolls Material: HSS Hardness: HSD90 Grade: BN-S20 Cutting parameters: Fr=0.2mm/r，Vc=50m/min Machining type: Dry Machining performance: BN-S20 CBN inserts and carbide inserts

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Summary： With the increasing requirements for higher performance of rollers, more and more high hardness and high-quality rollers are appearing inmill rollings. In order to ensure the overall efficiency of the company,mill rollings are constantly seeking wear-resistant and impact resistant tools, which is a good opportunity for the tool industry. As long as high-quality, high-efficiency, wear-resistant and impact resistant tool materials are developed, only then can the mechanical manufacturing industry get better development.

Note： When using BN-S20 CBN insets to process high-speed steel rollers, dry cutting shall be adopted without coolant.

As a solid CBN insert, BN-S20 must be equipped with special holder to get better protection of the insert.

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