Allied Machine & Engineering Expands Range of Boring Tools

Tungaloy has added AH6225 grade inserts to its TCB indexable counterboring tool line.

TCB is an indexable, multifunctional counterboring tool line that is designed to be used on a variety of turning machines. The tool bodies are available for cutting diameters from 10 mm (0.394") to 59 mm (2.323"), enabling a range of counterbore diameters for cap bolts and nuts, as well as the rod peeling inserts expansions of existing hole diameters. The cutter bodies come in two styles depending on the intended cutting diameters: a mono block style is designed for machining from 10 mm (0.394") to 43 mm (1.69") diameter bores, while the cutters with exchangeable cartridges are for 26 mm (1.024") to 59 mm (2.323") diameters. The exchangeable cartridges can fine-adjust the BTA deep hole drilling inserts cutting diameters in 0.1 mm (0.004") increments by placing the adjusting shim plates, which are sold separately, between the cartridge and the pocket.

TCB now offers AH6225 grade inserts. This latest physical vapor deposition (PVD) coated grade features a high-hardness, titanium-rich PVD coating, combined with a tough dedicated carbide substrate. AH6225 enables TCB to efficiently cut bores in all material groups, including steel, stainless steel and exotic materials.

The Cemented Carbide Blog: Turning Milling Inserts

Using Variables To Handle Cutting Condition Changes

The Hoffmann Group’s Garant HB 7010-1 turning grade features P10 gradient carbide for wear resistance at the highest cutting speeds.

According to the company, HB70xx line’s smooth exterior and ductile interior was inspired by sharks’ teeth. The Garant HB 7010-1 offers a wear-resistant and thermo-resistant CVD coating made of aluminum oxide Al203 and titanium carbonitride Ti(CN), which protects the carbide substrate even at high cutting speeds and process temperatures. The carbide substrate is particularly resistant to plastic deformation, gravity turning inserts splintering, and brittle fracturing because it is extremely ductile. As a result, this grade offers potential for extended tool life during continuous cutting at high speeds, the company says. 

Straightened crystal structures are a key factor in the resistance of this coating. Its extremely smooth surface enables optimum chip evacuation and reduces the friction between the component and the tool material, lowering process temperatures.

In contrast to the casing, the core of the indexable insert is ductile. The carbide substrate is graded, which means that it has an increased proportion of titanium nitride in the outer layer in order to adapt the thermal expansion coefficient to the coating. As a result, the coating optimally adheres to the substrate, the company says. It adds that because of the similar thermal expansion coefficient, BTA deep hole drilling inserts the coating cannot shear away, even at high process temperatures.

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