The diameter of the internal grinding wheel should not be too large or too small.
Diameter of the grinding wheel is too large, the contact arc between the grinding wheel and the workpiece will increase, which will increase the grinding heat and make cooling and row cutting difficult. If the diameter of the grinding wheel is too small, it is difficult to achieve the ideal grinding speed (30m/s~50m/s), which increases the grinding thickness, increases the conformity of the grinding grains, and is easy to blunt, which increases the surface roughness of the inner hole and reduces the production efficiency when grinding the hole of workpiece.
In order to achieve good grinding effect, the grinding wheel diameter should maintain an appropriate ratio to the inner hole diameter, which is usually between 0.5 and 0.9. When the aperture is small, as long as the problem is that the grinding wheel circumference speed is low, the large ratio value should be taken at this time; when the hole distance is small, the main problem is the difficulty of cooling and removing debris, and the smaller ratio should be removed at this time. inner round grinding wheel diameter selection can refer to the table below.
|
Diameter of hole (mm)
|
Diameter of wheel
(mm)
|
Diameter of hole (mm)
|
Diameter of wheel
(mm)
|
|
12~17
|
10
|
45~55
|
40
|
|
17~22
|
15
|
55~70
|
50
|
|
22~27
|
20
|
70~80
|
65
|
|
27~32
|
25
|
80~100
|
75
|
|
32~45
|
30
|
~
|
~
|