How to adjust the external cylindrical grinder on the grinding wheel

Most cylindrical grinders place the parts and grinding wheel on a horizontal line. The highest point of the outer circle of the part and the highest point of the outer circle of the grinding wheel are called the contact point between the part and the grinding wheel. Diamond dressing tools should be used to dress the grinding wheel as close as possible to the contact point between the part and the grinding wheel. For grinding wheels used in internal grinding machines, it is more important to use diamond dressing tools close to the highest point of the outer circle of the grinding wheel (i.e. the contact point between the part and the grinding wheel during hole grinding) for dressing.

 

1. Adopt minor adjustments

To reduce the repair time, there seems to be a tendency to choose a larger repair depth. This is an extremely erroneous idea. It is necessary to choose the most suitable removal depth to repair the grinding wheel. Choosing a too large removal depth will result in high cutting temperatures, reduce the service life of the dresser, and also cut off useful grinding wheel layers. The ultimate result was damage to both the dresser and the grinding wheel, which had the opposite effect. The optimal amount of adjustment is based on the principle that after several adjustments, the geometric shape of the grinding wheel can be restored while producing a good grinding edge. When using a single point dressing tool, the diameter direction of the grinding wheel should be in contact with the axis at a tilt angle of 10-15 °. This will cause the single point trimming tool to produce a sharpening effect during regular rotation. The trimming tool with multi-point contact does not need to be tilted at this angle. Change to using the entire end face of the dressing tool in 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 crucial role in the surface roughness and metal cutting rate required for machining parts. If the lateral movement speed is too slow, it will block the grinding wheel, damage the surface roughness and metal cutting rate of the parts. Too slow lateral movement speed can also cause vibration of the grinding wheel and burn the surface of the parts. A uniform and fast lateral movement speed can refine the surface of the grinding wheel, improve its grinding performance, increase grinding efficiency, and reduce the surface roughness of the parts.

 

 

2. Keep cool

 

Proper use of coolant can accelerate repair speed and improve repair efficiency. Based on experience, selecting a 3/8-inch diameter coolant can remove a large amount of heat from the conditioner and extend its service life. When the diamond dressing tool passes through the grinding wheel, install a coolant nozzle to cover the entire surface of the grinding wheel or continuously add coolant to the diamond dressing tool. After the dressing tool comes into contact with the grinding wheel to start dressing, it is never allowed to remove the dressing tool from the coolant. Otherwise, the diamond dressing tool may crack or rupture under extreme temperature changes of cold and hot.

 

Using filters for high-precision filtration of coolant can avoid multiple cycles of dirt or chips in the coolant. Contaminated coolant can cause the grinding wheel to wear out quickly, increasing the number of times the grinding wheel needs to be repaired. Dry dressing should only be applied to the grinding wheel during dry grinding (in which case the cooling of the diamond dressing tool can be interrupted). Before stopping work every day, turn off the coolant and let the sanding wheel idle for a few minutes. This can prevent the grinding wheel from breaking.

 

3. Vibration is the enemy of finishing (application of form grinding in flat grinding)

 

In grinding wheel dressing, it is crucial to effectively reduce vibration, avoid leaving dressing marks, collisions, and damaging dressing tools on the surface of the grinding wheel. 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. Uneven density and the overall geometric shape of the grinding wheel can affect the inherent balance of a grinding wheel. Therefore, choosing a high-quality grinding wheel is also very important. If it is a high-quality grinding wheel, proper installation can maintain good balance of the wheel. According to the manufacturer's factory instructions, the grinding wheel is marked with an upward arrow, indicating the light end orientation of the wheel after rough balancing. Then the user can adjust the grinding wheel according to the arrow instructions to achieve dynamic balance. Adding coolant evenly can sometimes help maintain the balance of the grinding wheel.

 

In order to further avoid vibration, it is necessary to ensure that the trimming tool is firmly clamped on the clamp and maintain a minimum hanging amount to ensure that the trimming tool has sufficient rigidity. If the diamond tool is not firmly clamped, it will cause vibration, produce noise, create ripples on the surface of the part, scratch the surface of the part, and damage the repair tool.