Milling in the field of high-speed cutting (2)

Interchangeable solid carbide tool

Solid carbide cutting tools, especially small diameter tools, are widely used for die cutting of various materials. Between the indexable insert and the solid carbide tool, there is now an alternative third solution that can cover the characteristics of the first two to some extent, and it provides both cutting The indexable nature of the blade provides the benefit of using a medium to small diameter solid carbide end mill. Up to now, the prospects for this field have been evaluated, pointing out its potential advantages and disadvantages. However, a new tool concept can fully exploit this area.

Although indexable insert technology offers many benefits, modern solid carbide cutting with long radial cutting edges and axial feed capability is important, especially when the tool diameter is small. Advantages include high precision, high surface quality, knife performance and light cutting. The use of indexable insert tools requires a quick and easy replacement of the cutting portion of the tool, optimizing the performance of this part of the tool and increasing the use advantage.

The indexable insert end mill has a diameter as small as 12 mm. Below this diameter, the mounting and clamping of the insert becomes impractical. On the other hand, the diameter of the solid carbide end mill can be as small as 1 mm or less. 10-25

The diameter of mm is a range of both types of end mills and can be used in many machining processes. The interchangeable end mill combines the indexable insert with the solid carbide. The indexable insert can be used for high-efficiency roughing to semi-finishing, and solid carbide for semi-finishing to superfinishing. machining. As a third option, the head-removable end mill has the potential to be optimized in the cross-application area of ​​the two.

A key part of the CoroMill316 interchangeable cutter is the interface between the cutting head and the body. One of the most important parts of the interface is a specially developed, patented self-centering thread for pulling up and holding the top into the shank (for tensioning the tip and body) without any gaps. The axial support surface is as large as the radial support surface, and the inner end of the cutting head is supported inside the shank along the tapered surface, thus providing the highest bending strength. The cutting head of the cutting tool can be easily fixed and tightened with a slight turning of the wrench. The unique interface between the cutting head and the shank provides high rigidity for the full groove roughing process and high precision for precision finishing operations. The CoroMill 316 tool has repeatability of axial tool length and radial runout limited to 0.02 mm.

The CoroMill 316 tool has a balanced design so it can use a relatively high spindle speed. The combination of high speed and multi-tooth cutting heads provides very high feed rates and high cutting speeds. The interchangeable head concept also allows the tool geometry to be easily adapted to the workpiece material without the need for excessive tool stability. The tool stability of conventional solid carbide tools is affected by the core diameter.

Blade grade for higher speeds

When discussing blade grades for indexable milling cutters, high speed cutting requires the use of higher performance insert grades, especially when production efficiency is a priority over cutting versatility. When the metal removal rate and processing cycle need to be prioritized in mold milling and the cutting conditions are good, the performance of the general grade may not be good enough. When high cutting speeds, prolonged contact, and harder materials are used, crater wear, hot cracks, and plastic deformation may occur, which may reduce tool life and predictability.

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