The diameter of the inner inner cutting piece should not be too large or too small

When the inner hole is ground, if the diameter of the cutting piece is too large, the contact arc of the aluminum abrasive cutting disc and the workpiece increases, so that the grinding heat increases, and the cooling and the cutting are difficult. If the diameter of the cutting piece is too small, it is difficult to achieve the ideal grinding speed (30m/s~50m/s), so that the grinding thickness is increased, the conformation of the abrasive grains is increased, the bluntness is easily blunt, and the surface roughness of the inner hole is increased. Large, production efficiency is reduced.

In order to obtain a good grinding effect, the diameter of the 14 inches cutting disc should be kept at an appropriate ratio to the diameter of the inner hole, and the ratio is usually between 0.5 and 0.9. When the aperture is small, as long as the problem is that the peripheral speed of the cutting piece is low, a large ratio should be taken at this time; when the hole pitch is small, the main problem is that cooling and chip evacuation are difficult, and a small ratio should be obtained at this time.


The inner circular cutting piece width should not be too wide or too narrow

In the case of internal grinding, if the width of the cutting piece is too narrow, the cutting piece is easy to wear, which is not conducive to improving production efficiency and reducing surface roughness. If the cutting piece is too wide, the grinding force is increased, which may cause the cutting piece to be bent by the long axis. Deformation. Therefore, when grinding the inner hole, the appropriate cutting piece width should be selected. Within the range allowed by the rigidity of the long shaft and the power of the machine tool, the width of the cutting piece can be selected according to the length of the workpiece.

The details of the selection of CNC internal grinding blades are more important.

The quality of the CNC internal grinding machine depends to a large extent on the cutting piece. The cutting piece plays a key role in the grinding quality of the CNC grinding machine. We often use electroplated cutting piece, resin cutting piece, ceramic cutting piece, CBN cutting piece, etc., then we should choose what kind of cutting piece is the most What about us?

1. Selection of the shape of the CNC grinding machine cutting blade

Commonly used cutting blades for CNC grinding machines are available in cylindrical and cup-shaped cutting blades. The cylindrical cutting piece mainly grinds the through hole, and the cup type cutting piece mainly grinds the inner hole, and the end face of the step hole can also be ground.

2. CNC grinding machine cutting blade diameter selection

In order to obtain the ideal grinding speed in the grinding process of the CNC grinding machine, it is generally better to use the cutting piece close to the hole diameter, but when the diameter of the cutting piece increases, the contact arc of the cutting piece and the workpiece also increases, resulting in grinding. The increase in heat makes chip removal and cooling more difficult. In order to achieve better results, the diameter of the cutting piece generally has an appropriate ratio to the diameter of the workpiece to be ground. Usually this ratio is between 0.5 and 0.9.

3. Selection of cutting blade width

The CNC grinding machine adopts a wide cutting piece, which is beneficial to reduce the surface roughness value of the workpiece and improve the production efficiency, and can reduce the wear of the cutting piece. However, the cutting piece cannot be selected too wide, which increases the grinding force, thereby causing the bending deformation of the cutting piece to the long axis. To allow for the rigidity of the long axis of the cutting disc for stainless steel and the allowable range of machine power, the width of the cutting piece can be selected according to the length of the workpiece.

4. Abrasive, particle size, hardness and binder selection

The characteristics of abrasive grinding, particle size, hardness and bonding agent of CNC internal grinding machine can be selected according to the material and processing precision of the workpiece. Generally, the cutting piece structure used in CNC internal grinding machine should be looser than the outer cutting piece. number.