As long as you understand the following points of the CNC milling cutter, you can greatly reduce the runout error

by:Ronix Tools     2021-06-17
CNC milling cutters are generally used for plane milling of parts and components of steel, alloy steel, stainless steel, cast iron, aluminum alloy, high temperature alloy and other materials. Now, in order to facilitate everyone's understanding, I will give you a detailed introduction to the characteristics of CNC milling cutters. The CNC milling cutter has large chip capacity, smooth chip removal, and high processing efficiency; coarse and fine tooth structures have their own strengths to meet different conditions for processing; high-precision, long-life tool body; optimized geometry and grades to achieve high removal rate Cutting; Tough cemented carbide shim and self-positioning of the blades make the tool safer and easier to use; the set rate and high finish of the wiper blade are integrated; the versatility is good. Tool diameter D50-D315; large rake angle design, cutting more briskly.     Common milling cutter materials on CNC milling machines are: diamond, cubic boron nitride, ceramic tools, cemented carbide steel, high-speed steel.   1. The order of thermal conductivity: diamond and cubic boron nitride>ceramic tools>hard alloy steel>high-speed steel.   2. The order of hardness of the tool materials is: diamond and cubic boron nitride>ceramic tools>hard alloy steel>high-speed steel.  3. The order of the bending strength and fracture toughness of the tool materials is: high-speed steel> cemented carbide steel> ceramic tools> diamond and cubic boron nitride.   CNC milling cutters can use the following methods to reduce the radial runout error:    1. Use a sharp tool: Choose a larger tool rake angle to make the tool sharper to reduce cutting force and vibration. Choose a larger tool relief angle to reduce the friction between the tool's main relief surface and the elastic recovery layer of the transition surface of the workpiece, thereby reducing vibration.  2. The rake face of the tool should be smooth: During processing, a smooth rake face can reduce the friction of the chip on the tool, and can also reduce the cutting force on the tool, thereby reducing the radial runout of the tool.   3. Spindle taper hole and chuck cleaning: Spindle taper hole and chuck are clean, and there should be no dust and debris generated during workpiece processing. When selecting processing tools, try to use tools with a shorter extension length to load the knife, and the force should be reasonable and even, not too large or too small.  4. Reasonable use of cutting fluid: Reasonable use of cutting fluid, mainly cooling water solution, has little effect on cutting force. The cutting oil whose main function is lubrication can significantly reduce the cutting force. Because of its lubricating effect, it can reduce the friction between the tool rake face and the chip and between the flank face and the transition surface of the workpiece, thereby reducing the tool radial runout.   5. Use strong tools: There are mainly two ways to increase the strength of the tools. One is to increase the diameter of the tool holder. Under the same radial cutting force, the diameter of the tool holder increases by 20%, and the radial runout of the tool can be reduced by 50%. The second is to reduce the protruding length of the tool. The greater the protruding length of the tool, the greater the deformation of the tool during processing. When processing is in constant change, the radial runout of the tool will continue to change, resulting in a workpiece The machining surface is not smooth. The tool extension length is reduced by 20%, and the tool radial runout will also be reduced by 50%. 6. The selection of the amount of knife should be reasonable: if the amount of knife is too small, the phenomenon of processing slippage will occur, which will cause the continuous change of the radial runout of the tool during processing, so that the processed surface is not smooth. When the amount of knife is too large, The cutting force will increase accordingly, resulting in large tool deformation, increasing the radial runout of the tool during machining, and making the machined surface not smooth. 7. Use up milling in finishing: As the gap position between the lead screw and the nut changes during down milling, it will cause uneven feed of the worktable, resulting in shock and vibration, which will affect the life of the machine tool and tool. In addition to the surface roughness of the workpiece, when using up-milling, the cutting thickness changes from small to large, and the load of the tool changes from small to large, and the tool is more stable during processing. Note that this is only used for finishing, and down milling should be used when roughing. This is because down milling has high productivity and the tool life can be guaranteed.    
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