The AT-2 thread mill enables stable machining without chip trouble. Helical drilling and threading simultaneously: no pilot hole is required. By eliminating the need for a pilot hole, sudden change in workpiece configuration can be accommodated since it is possible for the AT-2 thread mill to process an internal thread even after the workpiece has been quenched.įigure 5. The tip of the tool incorporates an end mill’s end-cutting edge configuration to allow it to perform helical drilling and threading simultaneously. DUROREY coating: OSG original coating specially designed for hardened steel applications. in Japan): suppresses bending of the tool.įigure 4. Roughing Teeth: distributes tool load.įigure 3. Utilization of left-hand cut configuration to enable climb milling of right-hand threads.įigure 2. Left-hand cut configuration: long tool life is achieved by climb milling. The greatest feature of the AT-2 carbide thread mill is its ability to process hardened steel materials of approximately 60 HRC without having to prepare a pilot hole.įigure 1. OSG’s latest AT-2 carbide thread mill is developed specifically to combine the drilling of a pilot hole and threading into a single procedure even in difficult-to-machine materials such as hardened steel.įeatures & Benefits of the AT-2 Carbide Thread Mill with End-Cutting Edge With the release of the AT-2 carbide thread mill – a drilling and threading combo tool, more options are now available for effective thread milling of difficult-to-machine materials such as hardened steel. However, up until now, thread mills are not capable of handling work material with a hardness of around 60 HRC. Even large-diameter threads can be processed in machines with a small horsepower compared to cutting taps. Not only can the cutting speed be adjusted, but also the feed amount, making it possible to reduce the tool load on the cutting edge by cutting condition and offer numerous qualities that can resolve common tapping obstacles.Ī thread mill’s cutting mechanism is similar to the side milling of an end mill. Thread mill, in contrast, forms threads by intermittent cutting. Due to these limitations, threading by cutting taps is considered to be a difficult process. Only the cutting speed can be adjusted, and chip shape varies depending on the difference in cutting speed. Therefore, the feed per revolution is fixed by the processing pitch. In tapping, a tap can only advance one pitch per revolution. These effects and correlations must be taken into consideration in the product development process. Furthermore, the chamfer length is particularly critical for the processing of blind holes, since the length is limited by the pilot hole allowance. With a limited flute width, chip evacuation, cutting oil lubricity and cooling performance are reduced. The more flutes, the smaller the individual flute will become. Specifically, it is possible to disperse the tool load by lengthening the chamfer and increasing the number of flutes in cutting taps. By increasing the number of chamfers, the tool load on the cutting edge can be dispersed. In the machining of difficult-to-machine materials such as hardened steel, heavy tool load is concentrated on the cutting edge, which can lead to tool damage. Although thread mills are highly reliably due to their low risk of breakage and long tool life characteristics, tooling choice will vary depending on the actual machining environment and specific needs of the manufacturer.Ī thread is formed mainly by the chamfer section of a tap. Furthermore, thread mills are able to divide cutting chips into small and manageable pieces even in difficult-to-machine materials with a tendency to form unstable chip shape. With thread mills, the tool load on the cutting edge can be drastically reduced in the processing of hardened steel versus cutting taps. Thread milling cutters are considered to be the optimum tooling choice for the threading of difficult-to-machine materials such as hardened steel. Tomonori Yoda, OSG Corporation Applications Engineer (Tap Development Division) Drilling and threading combo tool for hardened steel applications
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