Halnn CBN inserts solutions for turning hardened steel, cast iron, rolls

Halnn journal

CBN tools are suitable for machining what materials Cubic boron nitride (CBN) tools high hardness, good wear resistance, impact toughness, chemical inertia, and iron is not easy to play a chemical reaction, but also because of these properties, so that it is widely used in the field of ferrous metals, but also not as some people understand that, carbide tools can not be solved, CBN tools can be solved, which is not true.

CBN tools has four main application areas, in these four major areas can replace the carbide tools machining, respectively: the field of hardened steel, the field of cast iron, powder metallurgy field, and repair the workpiece field (this industry rolls, hydraulic strut parts more).

Hardened steel field: as the name implies is after heat treatment - quenched steel parts, hardness are above HRC50, this industry such as gear gear shafts, drive shafts, wind power bearings, slewing bearing bearings, synchronizers, three-pin shafts, ball cages, cross shafts, ball screw parts and so on are more common. This field of

Halnn journal high hardness is on the one hand, on the other hand is the existence of interrupt machining, heat treatment cutting allowance is not uniform, the impact toughness and strength of the tool requirements are very high, low hardness of cemented carbide tools itself, wear will be relatively fast, and such parts are mostly mass production, so the use of CBN tools, not only to achieve hard cutting, but also to meet the interrupt cutting does not broken effect, but also to meet the Ra0.8 surface roughness.

Halnn has launched a variety of tools for the hardened steel field, BN-H05, BN-H10, BN-H21, BN-H200, BN-S200, BN-S20, etc. According to the specific processing requirements of the customer, we can recommend the appropriate tool material and cutting parameters.

Cast iron field: cast iron is divided into gray cast iron, ductile cast iron, wear-resistant cast iron, of which ductile cast iron is only recommended for QT600 and above grades using CBN tools machining, QT600 below the grades are recommended or the use of cemented carbide tools for higher economy.

Gray cast iron and wear-resistant cast iron can be processed with Halnn CBN tools, gray cast iron materials are brittle materials, the hardness itself is not high, mainly because of the parts of the production of high beat requirements, so the need to use high-efficiency tooling, CBN tools compared to cemented carbide tools, not only the efficiency of the increase of 2-4 times, and the tool life of it is more than 5 times.

Such as BN-S300 material and BNK30 material is mainly used for gray cast iron rough finishing machining of the two tools, the line speed can reach 1500m/min, in the case of machine tool rigidity is not taken into account.

At the same time for wear-resistant cast iron, mainly because the hardness is too high, and casting molding wear-resistant cast iron surface casting defects, carbide tools often car can not, so the emergence of the BN-K1 material CBN tools, BN-K1 material is the whole Solid CBN tools, roughing and finishing can be, the hardness of HV3000-3250, and casting defects encountered do not need to reduce the speed of cutting Can be processed, life is 3-5 times the carbide tool.

Powder metallurgy field: powder metallurgy parts cutting allowance is very small, basically 0.5mm or less, but because the hardness of the constituent particles is

Halnn journal as high as HRC60, so the use of CBN inserts is more effective, such as BN-K50, BN-K10, BN-H21 material can be processed. The common parts of powder metallurgy are valve seat ring, belt wheel, synchronizer tooth hub, etc. Halnn has rich experience in the above industries, which can help customers realize efficient processing.

Repair workpiece field: this industry roll, hydraulic strut more, repair process has surfacing, spray welding, thermal spraying, etc. especially the cost of a roll is higher, the cost of direct scrapping for a new one is too high, so a lot of them are using the way of repair, the roll is repaired and then processed into a new roll, to meet the size of the other requirements. Compared with the cost of replacing a new roll is much lower.

For this kind of repair workpiece, Halnn BN-S20 material can be effectively solved, such as roll industry turning round, groove can be solved.

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