1. The mechanism of heat or burn in double face grinding:

In the process of double face grinding, because of the grinding effect of abrasive particles on the workpiece, the metal surface produces plastic deformation, and the relative displacement between the metal molecules inside the workpiece produces internal friction and heat; when the grinding wheel of the end face grinding, the speed relative to the workpiece is very high, and the surface of the workpiece produces violent external friction and heat.

And because the grinding of each abrasive is instantaneous, and its heat generation is instantaneous, and it can't be transmitted in time, so the instantaneous temperature in the grinding area is higher, generally up to 800-1500 ℃. If the heat dissipation measures are not good, it is easy to produce the situation of heat or burn on the surface of the workpiece, that is to say, secondary quenching occurs on the surface of the workpiece, which damages the surface of the workpiece Organization, you can see the scorched yellow or black oxide film on the surface of the workpiece, reducing the service life of the workpiece.

2. Prevention of heat or burn in double face grinding:

a. Select the coolant with appropriate concentration, flow and pressure. The reason for the heat or burn of the workpiece is that the heat is not released in time.

b. Reduce the grinding allowance and increase the speed of workpiece. Reducing the grinding thickness reduces the internal friction, thus reducing the grinding heat; reducing the rotation speed of the workpiece, shortening the grinding time in the grinding area, reducing the accumulation of grinding heat.

c. The end grinding wheel with suitable hardness and grinding wheel size shall be selected. From the end grinding wheel, abrasive hardness is high, cutting performance is good, can reduce heat, but also can not be too hard. The structure should not be too fine or Morton's abrasive will easily fall off and block the wheel.

Summary of manufacturers of double face grinder:

To ensure the accuracy of grinding workpiece, the grinding wheel with low hardness and large organization number shall be used at rough grinding time, and the grinding thickness shall be larger; the grinding wheel with hard and small organization number shall be used at final grinding to ensure effective dressing of grinding wheel, and the grinding thickness shall be smaller; for materials with high grinding strength, high hardness and poor thermal conductivity, it is easy to adopt a smaller feed to improve the speed of workpiece Effectively avoid burns.