In the process of CNC machining parts, the radial runout of the tool will bring about certain errors, which will in turn affect the production accuracy of the workpiece, so that it can not be used better, resulting in a waste of resources, so we have to find ways to solve this problem.

The radial runout of the tool during machining is mainly because the radial cutting force aggravates the radial runout. Therefore, reducing radial cutting force is an important principle to reduce radial runout. The following methods can be used to reduce radial runout:

1, the use of sharp tools

Select a larger tool front angle to make the tool sharper to reduce cutting force and vibration. Select a larger tool rear angle to reduce the friction between the main rear face of the tool and the elastic recovery layer of the transition surface of the workpiece, which can reduce vibration. However, the front and rear angles of the tool should not be selected too large, otherwise it will lead to insufficient strength and heat dissipation area of the tool. Therefore, to be combined with the specific circumstances of the selection of different tool angle and back angle, roughing can take some small, but in finishing, out of the consideration of reducing the radial runout of the tool, it should be made a little larger, so that the tool is sharper.

2, the front face of the tool should be smooth

In the use of CNC milling machining centers, smooth front face can reduce the chip friction on the tool, can also reduce the cutting force on the tool, thereby reducing the radial runout of the tool.

3, the amount of tool eating selection should be reasonable

Eat too small, there will be a phenomenon of machining slippage, which leads to the tool in the processing of radial runout amount of constant change, so that the machined surface is not smooth Eat too much, the cutting force will be increased, resulting in large tool deformation, increasing the tool in the machining of radial runout amount, but also will make the machined surface is not smooth.

4, spindle taper hole and collet cleaning

CNC milling machining center spindle taper hole and collet clean, there can be no dust and workpiece processing debris. Selection of machining tools, try to use a shorter extension length of the tool on the knife, the strength should be reasonable and uniform, not too large or too small.

5、Use reverse milling in finishing

Due to the smooth milling, the position of the gap between the screw and the nut is changing, which will cause uneven feeding of the table, so there is shock and vibration, affecting the machine tool, tool life and surface roughness of the workpiece, and in the use of inverse milling, the cutting thickness from a small to a large, the tool's load is also from a small to a large, the tool in the processing of a smoother. Note that this is only used in finishing, in roughing or to use the smooth milling, this is because of the high productivity of the smooth milling, and tool life can be guaranteed.

6, the rational use of cutting fluid

Reasonable use of CNC milling machining center cutting fluid to the cooling effect of the main water solution on the cutting force has little impact. To lubricate the main role of cutting oil can significantly reduce the cutting force. Because of its lubricating effect, it can reduce the friction between the front face of the tool and the chip and between the back face and the transition surface of the workpiece, thus reducing the radial runout of the tool.

7, the use of strong tools

Mainly through two ways to increase the strength of the tool. First, you can increase the diameter of the shank in the case of the same radial cutting force, the shank diameter increased by 20%, the radial runout of the tool can be reduced by 50%. Secondly, you can reduce the length of the tool outstretched, the greater the length of the tool outstretched, the greater the deformation of the tool during processing, processing in the constant change, the radial runout of the tool will be constantly changing, resulting in the surface of the workpiece machining is not smooth Similarly, the tool outstretched length reduced by 20%, the radial runout of the tool will also be reduced by 50%.

The above seven points is to reduce CNC milling machining center tool radial runout method. Practice has proved that as long as the machine tool parts manufacturing, choose a reasonable process, tooling, radial runout of the tool on the workpiece machining accuracy of the impact can be greatly reduced.