Surface Grinding - Acer Supra 818PD Operation Manual

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5.3 SURFACE GRINDING

5.3.1 SURFACE GRINDING PROCEDURES
The most common operation for a surface grinder is the flat surface grinding. The
operation is to grind a surface to the desired finish, then grind it to the desired size. Therefore
the correct selection of a grinding wheel and workpiece mounting are the two most important
factors in surface grinding. Surface grinding procedures are shown as below:
A. Select a correct grinding wheel depending on workpiece type, and then mount it on the spindle.
B. If necessary, perform balancing, truing and sharpening the grinding wheel.
C. Inspect burrs on the magnetic chuck, and remove them by using an oil stone. If the chuck is seriously
scratched, polish it by using a grinding wheel.
D. Remove all burrs on the workpiece.
E. Place a thin paper at the center of magnetic chuck, which size should be bigger than the workpiece.
F. Mount workpiece and increase magnetism of the magnetic chuck.
G. Check if workpiece is held securely.
H. Adjust the table reverse movement dog position, so that the center of grinding wheel exceeds 25mm to each
end of workpiece. See left figure shown below.
I. Adjust cross feed amount. Normal grinding amount is 0.075mm~1.25mm.
J. Manually adjust table until there is a 3mm overlap between the workpiece side and the grinding wheel edge,
shown as left figure below.
圖(B)
Grinding wheel moves 25mm over workpiece at each end.
K. Start the grinding machine running. Carefully lower the wheel head until it just touches the workpiece, and
sparks occur. Raise the grinding wheel about 0.125mm, so that it leaves from any high point of workpiece. Or
you may start the grinding machine, and then adjust the power control lever for starting table reciprocating
motions. Carefully lower the grinding wheel head until the grinding wheel just touches a high point on the
workpiece and sparks occur.
L. Perform rapid cross feed of workpiece across the grinding wheel face, and check the high point on the
workpiece.
M. Lower the wheel head 0.05mm~0.125mm to perform coarse grinding. If grinding depth is too much, it is
suggested to reduce table feed speed.
N. Make sure the coolant supply is sufficient to clean the grinding wheel surfaces and cool workpiece.
O. Set cross feed to perform coarse grinding on the workpiece.
P. Make sure the grinding wheel completely moves away the workpiece side. This setting should be made
before setting the grinding depth to avoid damage to the grinding wheel surfaces.
圖(C)
t
砂輪與工作物邊側重疊約 3mm
5-7
818~2040 PD
Grinding wheel overlap with
workpiece side about 3mm