Most cylindrical grinders place parts and wheels on a horizontal line. The highest point of the outer circle of the part and the highest point of the outer circle of the cutting disc are called the part/cutting disc contact point, and the diamond dressing tool should trim the China cutting disc for metal as close as possible to the contact point of the part/cutting disc. For the cutting disc for internal grinding machines, it is more important to trim the diamond dressing tool near the highest point of the outer circle of the cutting disc (ie, the part/wheel contact point when grinding the hole).
In order to reduce the dressing time, there seems to be a temptation to choose a larger depth of repair. This is an extremely wrong idea. The cutting disc must be trimmed with the most appropriate dressing depth. Choosing too large a repair depth will result in high cutting temperatures, reduced dresser life, and a useful wheel layer. The end result is damage to both the dresser and the cutting disc, which is counterproductive. The optimum dressing amount is that after several times of repair, it can restore the geometry of the cutting disc and just produce a good grinding edge.
With a single-point dressing tool, the diameter of the cutting disc should be contacted at an angle of inclination of 10-15°. This will cause the single-point dressing tool to produce a sharpening effect when it is rotated periodically. A dressing tool with multiple points of contact does not need to tilt this angle. Instead, use the entire end face of the dressing tool to contact the surface of the grinding wheel.
The lateral movement speed is the speed at which the dressing tool passes through the surface of the cutting disc during dressing. It plays a key role in the surface roughness and metal removal rate required for machined parts. The lateral movement speed is too slow, which will block the cutting disc and damage the surface roughness and metal cutting rate of the part. Too slow lateral movement speed can also cause the wheel to vibrate and burn the surface of the part. Uniform and fast lateral movement speed can trim the surface of the cutting disc, improve the grinding performance of the cutting disc, increase the grinding efficiency and reduce the surface roughness of the part.
Proper use of coolant can speed up the dressing and improve dressing efficiency. As a rule of thumb, a 3/8-inch diameter coolant is used to remove a large amount of heat from the dresser and extend the life of the dresser. When the diamond dressing tool passes the cutting disc, install a coolant nozzle that fills the entire wheel surface or continuously fills the coolant to the diamond dressing tool. When the dressing tool comes into contact with the aluminum flat cutting disc and begins to be trimmed, the dressing tool must never be allowed to exit from the coolant. Otherwise, the diamond dressing tool will crack or crack under extreme cold and hot temperature changes.
The filter is used for high-precision filtration of the coolant to avoid multiple cycles of dirt or chips in the coolant. The contaminated coolant can quickly wear the wheel and increase the number of dressings. The dry grinding of the cutting disc is only carried out during dry grinding (only in this case the cooling of the diamond dressing tool can be interrupted). Before turning off the coolant every day before work, let the wheel idle for a few minutes. This will prevent the cutting disc from rupturing.