Relationship between grinding resistance and contact area
Which kind of grinding resistance may be greater under the same workpiece and grinding wheel. Face grinding or cylindrical grinding
Looking at the figure below, we can intuitively know that the answer is: A face grinding.
For the circle of the same diameter, has a larger contact area with the face and a smaller contact area with circle.
By calculation formula, the result is also that the contact area of face grinding is greater than that of cylindrical grinding.
| Grinding wheel size | Workpiece Diameter (mm) | Grinding wheel speed (m/min) | Workpiece speed (m/min) | Amount of feed (mm) | Contact arc length(mm) | Contact area(mm2) | ||
| Diameter(mm) | Thickness (mm) | |||||||
| Cylindrical grinding
|
355 | 32 | 50 | 3600 | 36 | 0.01 | 0.669 | 21.397 |
| 510 | 100 | 300 | 1800 | 18 | 0.01 | 1.388 | 138.811 | |
| Internal grinding
|
25 | 20 | 35 | 2000 | 20 | 0.01 | 0.945 | 18.895 |
| 75 | 38 | 100 | 1800 | 18 | 0.01 | 1.749 | 66.476 | |
| Face grinding
|
205 | 19 | 2000 | 20 | 0.01 | 1.446 | 27.476 | |
| 510 | 100 | 1800 | 18 | 0.01 | 2.281 | 228.090 | ||
Contact Arc Length=(1±v/V）√amount of feed/(1/grinding wheel diameter±1/workpiece diameter)
Contact area=contact arc length * grinding wheel thickness
Therefore, the contact area of the face grinding is larger, and the grinding resistance is also larger than that of the cylindrical grinding. (Only see the contact area, all other conditions are the same).
Knowing the size of the contact area is related to the grinding resistance. How can it help with grinding?
If the same grinding wheel is applied to grinding with different contact areas, there will be the following grinding differences:
| Cylindrical grinding | Face grinding | |
| small | Contact area | large |
| small | Grinding Impedance | large |
| small | heat | large |
This difference has a great influence on the grinding result, especially the resistance is high and easy to heat. So, the grain size of the grinding wheel needs to be adjusted.
Therefore, differences in grinding conditions can affect the choice of grinding wheel.
More information about surface grinding wheel & cylindrical grinding wheel, please click the below pictures
