How to Choose Cutting Fluid in CNC Machining

1. Selection of Cutting Fluid in Rough Machining

In rough machining of CNC, large machining allowance and large cutting parameters are used to generate a large amount of cutting heat. When using high speed steel milling cutter, the main purpose of using cutting fluid is to reduce cutting temperature and milling cutter wear. Cemented carbide tools have good heat resistance, generally without cutting fluid, it is necessary to use low concentration emulsion or aqueous solution. However, it is necessary to pour continuously and sufficiently to avoid cracking of carbide blades under high temperature due to huge internal stress.

2. Selection of Cutting Fluid in Finishing

When finishing, the surface roughness value is required to be small. Cutting fluids with good lubricity, such as high concentration emulsifier or cutting oil containing extreme pressure additives, are generally selected.

3. Choosing cutting fluid according to the properties of workpiece materials

Cutting fluids are required for cutting plastic materials. When cutting brittle materials such as cast iron and brass, cutting fluids are generally not used to avoid the debris sticking to the moving parts of the machine tool.

When machining hard-to-machine materials such as high strength steel and superalloy, cutting fluid containing extreme pressure additives should be selected because the cutting process is in extreme pressure lubrication and friction state.

When cutting non-ferrous metals and copper and aluminum alloys, in order to obtain high surface quality and accuracy, 10% to 20% of emulsion, kerosene or kerosene and mineral oil mixture can be used, but sulfur free cutting fluid can not be used, because sulfur has a corrosive effect on non-ferrous metals.

When cutting magnesium alloy, water solution should not be used to avoid burning.

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