Milling development prospects and challenges


Square shoulder milling accounts for the largest proportion of today's milling operations. Similarly, continuous improvement in productivity, reliability and quality levels has enormous potential. In many end-milling applications where end face, edge and groove cutting are required, square shoulder milling can often be used. Almost every manufacturing company's processing plant needs to perform some form of process, and the number of applications is growing.

At present, there are two main directions in improving these milling processes: one is through higher metal removal rates, especially on smaller machines; the other is to obtain better surface quality by one pass. achieve. These new functions can be combined by a unique new milling tool.

Processing methods are changing

In general, on the machine side, smaller machine tools and/or low-power spindles are increasing; high spindle speeds provide high cutting speeds, machine tools can achieve higher feed rates; and tool chamber capacity is highlighted The need for good tool versatility; the need to monitor operators is getting smaller and smaller.

In terms of operation, due to its advantages for machine tools and its low power consumption, small depth of cut is the first choice. More complex roughing/finishing cuts are required, and longer tool accessibility is required. High flexibility and more efficient tool clamping to avoid burr/joint errors as much as possible.

When developing a new tooling platform for square shoulder milling cutters, the progress and experience gained in expanding the established CoroMill series of milling tools played an important role. With the development of CNC machine tools, this long process has been going on for 20 years, and there have also been many tools that have greatly improved the processing performance of the shop in different manufacturing departments.

Development of CNC milling tools

The CoroMill290 square shoulder milling cutter combines several advantages, such as a pre-hardened body and a cost-effective square insert with four cutting edges and high center strength screws (providing high strength in many demanding processes) Accuracy and improved blade positioning make it easy to achieve better surface finish than before. This 90° milling cutter has become a very versatile tool from small diameter to large diameter, enabling considerable depth of cut.

Pure face milling, including finishing to mirror-like surfaces and roughing with high metal removal rates, has been combined into a face milling cutter, CoroMill245. With a 45° lead angle, the cutter can achieve a cutting force balance for a specific pass when the high table is fed or the tool overhang is too long. In general, the subsequent steps can be eliminated by the wiper option on the blade. In most workpiece materials, this tool has become the hallmark of face milling.

Whether it is deep or shallow shoulder milling, there is a unique need for tools, and 90° tools are an essential choice. Similarly, CoroMill 790 represents a new direction, initially focusing on the cutting of non-ferrous materials, such as aluminum wings in the aerospace industry. This tool has a very high metal removal rate, which leaves a high-quality shoulder surface for high-speed cutting and negligible tooling errors. Since it was developed specifically for light cutting, low power requirements are clearly an advantageous feature. In addition, extremely safe and precise blade positioning makes the tool suitable for ramp milling, interpolation milling, large depth of cut and plunge milling.

End mills are the most common milling tools because they perform most processes. The CoroMill390 indexable insert gives new meaning to the tool type when it is launched. Here, the 90° tool is able to perform all the tasks required for a CNC machine – the modern light cutting end milling process in all forms, including efficient deep-to-shallow shoulder milling with good surface quality. When the larger blade models were subsequently introduced, there were not only fewer restrictions, but even most of the limitations were eliminated.

The insert model determines cutting parameter capability, cutting time, tool life, reliability, and versatility. The recently introduced new generation of coated carbide tools offers a considerable level of performance. This not only makes the shop more competitive, but also meets more stringent deadline requirements and achieves higher quality consistency. The new CVD and PVD coated inserts allow for higher cutting parameters and enable reliable and predictable high-speed cutting in their applications. Especially for the new square shoulder milling, the development of this grade also makes it possible to use a sharper positive rake cutting edge for lighter, more precise cutting without any reduction in blade strength.

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