What are the requirements for CNC precision parts machining of super hard abrasive processing?

2021/08/31


 

Grinding of superhard abrasive micron grinding wheels can be performed on CNC precision parts processing grinders, and for precision grinding should be performed on the corresponding CNC precision parts processing grinders, but due to the small size of micron abrasive particles, the grinder should have a micron-level transverse feed system to ensure the required grinding depth.

 

In practical terms, superabrasive grinding places a number of requirements on the grinding machine, and it is desirable to be able to perform the grinding process on a superabrasive grinding machine. The main requirements for grinding machines for superabrasive grinding are as follows.

 

The grinding wheel spindle rotation accuracy should be <0.001 mm for radial circular runout and <0.005 mm for axial circular runout, and the spindle bearing should be a dynamic pressure bearing or a dynamic-static pressure combination bearing, or a static pressure bearing, to ensure the processing accuracy required for precision grinding.

 

2. The grinding machine must have sufficient rigidity, high stability and low vibration. The stiffness of the machine affects the sockability and vibration resistance of the grinding process, thus affecting the durability and life of the superabrasive grinding wheels and the quality of the grinding process, and generally requires an increase in stiffness of about 50% compared to ordinary grinding machines.

 

3. A good feed system with high precision, uniform and stable speed and wide speed range is required to ensure productivity at high speed and size, shape accuracy and surface roughness at low speed. In general, the minimum longitudinal feed speed should be O.lm/min or even less, and the minimum transverse feed speed (grinding depth) should be 0.001-0.0005 mm/8t (st^ single stroke). For micronized wheel grinding, the matching of the transverse feed speed of the grinding machine with the size of the grinding grain should be considered.

 

4, should consider the problem of super-hard abrasive wheel dressing, super-hard abrasive wheel dressing will involve some special devices, working fluids, the need for dressing parameters, etc., should make the machine tool have the possibility of modification.

 

5, all moving parts of the machine such as the spindle rotation part, the feed movement guide part, etc. should be reliably sealed to prevent the entry of super hard abrasives causing serious wear.

 

6, There should be a perfect grinding fluid treatment system to ensure the cleanliness and function of the grinding fluid so as not to affect the surface roughness of the processing and to prevent the grinding work beans from causing wear to the moving parts of the machine tool.

 

The machine tool should be placed on a vibration-proof foundation and vibration-proof and vibration-insulating measures should be taken, such as fine dressing and balancing of the grinding wheel and the addition of vibration-proof pads at the contact between the machine tool and the ground.