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Stripping is not a new method of processing, but the modern version of efficient stripping has a new concept. Ten years ago, due to the limitations of tools and machine tools, stripping milling can only be used for one type of finishing or rough milling. If two types of machining are required, two types of tools, roughing and finishing, must be used. Also very low. With the continuous advancement of machining technology, it is now possible to complete both roughing and finishing operations with one tool at a time.
Stripping is characterized by a large axial depth of cut (up to the maximum depth of cut of the tool) and a small radial depth of cut (5%-10% of the tool diameter). This combination of methods can greatly reduce the cutting force (especially the radial cutting force) during machining; at the same time, the feed rate and cutting speed can be significantly improved. The advantages of this type of processing include better cutting stability, higher machining accuracy and greater metal removal rates. In addition, the stripping process can reduce the radial joint area between the tool and the workpiece and reduce the cutting force, thereby obtaining a good surface quality, so that it is possible to eliminate secondary finishing.
Smaller cutting forces also extend tool life and increase predictability of tool failure. Since the radial contact area between the tool and the workpiece is reduced, the tool has a shorter heating time during cutting and a longer cooling time, which also contributes to longer tool life. The extension of the life of the stripping tool is of particular importance when considering the use of stripping tools to continue with a variety of additional cutting operations.
Cycloidal stripping method The cycloidal stripping method is a typical application of stripping milling. It is a series of overlapping circular tool trajectories in the X-Y plane. It is designed to continuously and efficiently mill the workpiece groove shape with full depth without stopping the machine. The cycloidal stripping method was originally developed to solve the technical problem of efficient milling of hardened steel and difficult-to-machine materials. For example, when machining a groove with a width of 24 mm and a depth of 20 mm, the conventional machining method may require a pass 3-4 times, and the cycloidal stripping can be completed by one continuous pass, which can greatly shorten the machining time. The rigidity, geometry and service life all place higher demands. Although the radial contact of the tool with the workpiece during cutting is relatively small, the tool is still fully contacted in the axial direction and still needs to withstand deformation and vibration (especially when machining difficult materials and tool overhangs). This requires the tool to have a high strength, high rigidity body and requires stable cutting conditions. Another requirement is that the tool must adopt a free-cutting geometry. Many of the newly developed small-diameter collet-blade end mills meet these requirements (such as Seco Tools' Helical Nano Turbo whirlwind cutter). With cycloidal stripping, a tool can be used to machine a groove width ranging from a groove width slightly larger than the tool diameter to a groove width several times larger than the tool diameter. This tool combines high metal removal rates with economy and processing flexibility, and thanks to the use of indexable inserts, there is no need to regrind the tool.
At present, high-efficiency stripping processing technology has been applied to industries such as mold manufacturing. In the past, when traditional processing techniques were used, the tool required a series of reciprocating motions, and the cutting speed was low and the number of passes was large. It took a lot of time to cut the material from the mold cavity and the groove. Now with the cycloidal stripping method, the operator can complete the machining at a high cutting amount along the machining contour of the part, which can significantly reduce the number of passes and shorten the machining time. Processes that were previously completed with slower processes or more expensive solid carbide end mills can now be completed with less time and a tool holder indexable tool with better machining results. The production workshop should analyze and compare the linear stripping method and the cycloidal stripping method to determine which processing method can be used to achieve higher production efficiency.
Efficient stripping and machining
Today, machine tools and tooling technology have evolved considerably. With the maturity of control technology, modern machine tools are characterized by high power, high stiffness, high spindle speed and large feed. In order to give full play to the technological advantages of modern machine tools, we have developed a variety of small machines that can be machined in one installation (including shoulder milling, contour milling, slotting, plunge milling, circumferential and helical interpolation milling, etc.). Tool. An example of such a tool is a machine-Clamp blade end mill that can be as small as 9.5 mm in diameter developed by Seco Tools. This tool combines with the machining performance of modern machine tools, enabling users to use stripping technology to achieve efficient milling of difficult-to-machine materials.