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Relationship between grinding resistance and contact area

July 25, 2019

Which kind of grinding resistance may be greater under the same workpiece and grinding wheel. Face grinding or cylindrical grinding 

surface grinding, 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.

surface grinding, cylindrical grinding

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.

surface grinding, cylindrical grinding

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

cylindrical diamond grinding wheel surface diamond grinding disc

 
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