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High-speed cutting with carbide micro-cutting tools

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Update time : 2017-10-30 14:54:42
The advantages of high-speed cutting with carbide micro-cutting tools include: cutting force is small, the tool is not easy to damage, the processing temperature is low, the surface finish is good, can cancel the subsequent deburring, oil operation and tool vibration. Up to 60000r / min spindle speed so that the processing speed than in the past greatly accelerated, while the workpiece processing quality has also been improved. Today, the types of workpieces are increasing, and the size of the workpiece is shrinking. The trend of manufacturing miniaturization requires that the manufacturing process be changed accordingly. This growing demand requires people to rethink how to use a smaller diameter tool to achieve more efficient processing. The smaller the diameter of the tool, the higher the required spindle speed (rpm), and most of the conventional machine tool spindle is difficult to achieve such a high speed, even if it can be achieved, the machine spindle in the limit state of continuous operation will make it bear Large stress. Conventional CNC machining machines use a tool with a diameter less than 0.5 "(12.7mm) for machining at 10,000r / min or less, often resulting in unreasonable feed and costly tool damage.

Conventional machining methods typically use larger tools for machining at lower speeds, and in general, larger tools themselves are not designed to perform more complex processes. In order to use micro-tool for processing, conventional machine tools must be low-speed operation, and micro-cutter brittle and easy to break. Larger tools because of the larger quality, so the force on the chip has a certain rebound effect; the other hand, the smaller the tool due to large brittle and more easily damaged.

Poor chip removal is one of the main causes of tool damage. In fact, micro-tools that are damaged due to poor chip removal are more than those that use unreasonable cutting parameters. In order to minimize the possibility of tool damage, the chips must be quickly discharged from the cutting zone. Micro-tools require high spindle speeds during machining and even higher spindle speeds for quick chip removal.

Tool size and machining speed Definitions: "Micro Cutter" includes milling cutters and drills with diameters below 0.250 "(6.35mm). This small diameter tool is essential for complex, fine machining and high speed spindles for optimum machining Effect. "High-speed cutting" There is no definite definition and absolute parameters, but an available reference is the spindle speed above 25000r / min can be called high-speed cutting.