Most cylindrical grinders place parts and wheels on a horizontal line. The high point of the outer circle of the part and the high point of the outer circle of the grinding wheel are called the part/wheel contact point, and the diamond dressing tool should trim the grinding wheel as close as possible to the contact point of the part/wheel. For the grinding wheel for internal grinding machines, it is more important to trim the diamond dressing tool close to the high point of the outer circle of the grinding wheel (ie, the part/grinding point at the time of grinding).
1. Take a micro dressing
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 grinding wheel must be trimmed with the appropriate depth of repair. Choosing too large a repair depth will result in high cutting temperatures, reduced dresser life, and a useful wheel layer. The result of the final ji is to damage both the dresser and the grinding wheel, which is counterproductive. Zui Jia's dressing amount is the same as that after several times of repairing, it can restore the geometric shape of the grinding wheel and just produce a good grinding edge. With a single-point dressing tool, the diameter of the grinding wheel 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 make contact with the surface of the grinding wheel.
The lateral movement speed is the speed at which the dressing tool passes through the surface of the grinding wheel 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 grinding wheel 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 grinding wheel, improve the grinding performance of the grinding wheel, increase the grinding efficiency and reduce the surface roughness of the part.
2. Keep cooling
Proper use of coolant can speed up dressing and improve finishing 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 through the grinding wheel, install a coolant nozzle to fill the entire surface of the wheel or continuously fill the coolant to the diamond dressing tool. When the dressing tool is in contact with the grinding wheel and begins to be trimmed, the dressing tool is never allowed to be removed 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 grinding wheel 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 work every day, turn off the coolant and let the wheel idling for a few minutes. This will prevent the grinding wheel from rupturing.
3. Vibration is the enemy of dressing (application of forming grinding in surface grinding)
In the dressing of the grinding wheel, it is essential to effectively reduce the vibration, avoid leaving traces on the surface of the grinding wheel, colliding and damaging the dressing tool. This means that the balance of the grinding wheel must also be maintained, which is determined by the structural characteristics of the grinding wheel itself. The uneven density and the geometry of the entire grinding wheel will affect the inherent balance of a grinding wheel. Therefore, it is also important to choose a high quality grinding wheel. If it is a high-quality grinding wheel, it can maintain a good balance of the grinding wheel only by proper installation. According to the manufacturer's instructions from the grinding wheel manufacturer, the grinding wheel is marked with an upward arrow indicating the light end orientation of the grinding wheel after rough balancing. The user can then follow the arrows to pay attention to the dressing wheel to achieve dynamic balance. The coolant is evenly filled and sometimes helps the wheel to maintain balance.
In order to further avoid vibration, it is necessary to ensure that the dressing tool is firmly clamped on the holder and maintain a minimum amount of overhang to ensure sufficient rigidity of the dressing tool. If the diamond tool is not firmly clamped, it will cause vibration, noise, ripple on the surface of the part, strain the surface of the part and damage the dressing tool.
