Guarantee 5 Factories to Control Cutting Load in Milling(三)

Cutting edge groove
The geometrical angle and cutting edge of the cutter body help to control the thermal load. The hardness of the workpiece material and its surface condition determine the choice of tool rake angle. A tool with a positive rake angle produces less cutting force and heat, and at the same time, higher cutting speeds can be used. However, positive rake angle tools are weaker than negative rake angle tools, and negative rake angle tools can produce greater cutting force and higher cutting temperature.
The groove of the cutting edge can cause and control the cutting action and cutting force, thereby affecting the heat production. The contact between the tool and the workpiece can be chamfered, dulled or sharpened. After chamfering or dulling, the cutting edge is stronger, and produces more cutting force and heat. The sharp edge can reduce the cutting force and reduce the processing temperature.
The chamfer behind the cutting edge is used to guide the chips. It can be a positive chamfer or a negative chamfer. The positive chamfer will also produce a lower processing temperature, while the negative chamfer is designed to have higher strength and generate more heat.

The milling process is interrupted cutting, and the chip control features of milling tools are usually not as important as in turning. According to the material of the workpiece and the arc of engagement involved, it may become very important to determine the energy required to form and guide the chip. Narrow or forced chip-breaking chip control geometries can immediately roll up the chips and generate greater cutting force and more heat. More open chip control geometry can produce smaller cutting force and lower processing temperature, but may not be suitable for certain workpiece material and cutting parameter combinations.

A variety of related factors together form the load in metal cutting. In the process of processing, these factors will affect each other. This article discusses the thermal issues in milling and their relationship with mechanical factors. Familiarity with the factors that generate metal cutting loads and the overall results of their interactions will help manufacturers optimize their machining processes and maximize productivity and profitability.



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