In order to meet the surface quality and processing accuracy requirements, stainless steel parts usually use grinding processing methods. Due to the high toughness, small thermal conductivity and small elastic modulus of stainless steel, the following problems often occur during grinding:

        1) The grinding wheel is prone to sticking and clogging;

        2) The processed surface is prone to burns;

        3) Work hardening is serious;

        4) The workpiece is easily deformed.

        It is not difficult to see that the selection of grinding wheel and grinding fluid directly affects grinding efficiency and machining accuracy. This paper conducts an experimental study of the factors affecting adhesion plugging and surface roughness.

        Experimental conditions and methods

        The specimen material is 1Gr18Ni9Ti, its mechanical properties are: σb=530MPa, σ=40%, hardness HB=187. The specimen size is φ50mm in diameter, 300mm long, 

φ50 outer circle surface is finely turned, and center holes are drilled on both ends. The experiment was conducted on an MGB1420 cylindrical grinder. The grinding wheel 

was P400×40×203. The grinding method was cylindrical longitudinal grinding. In order to improve the reliability of the test results, repeated tests were conducted to observe 

the average effect and eliminate the influence of random factors. At the same time, Try to keep the grinding conditions basically unchanged, and examine the impact on the 

grinding effect by changing the particle size, hardness, and abrasives of the grinding wheel, replacing the grinding fluid, and the grinding amount.

        Analysis of results

        1---The influence of grinding wheel particle size on adhesion rate

        Four grinding wheels with white corundum, hardness K, and particle sizes of 36, 46, 60, and 80 were selected to perform longitudinal grinding of the outer circumference

 of the test piece. The grinding length was 600 mm. The adhesion rate was detected. The finer the grinding wheel, the greater the adhesion. The more serious the attachment,

 this is because there are cavities between the abrasive grains, and chips can be stored in the cavities during grinding; while the finer the grinding wheel, the smaller the 

cavities, and the grinding wheel quickly loses the chip-holding space, causing blockage.

        2---The effect of grinding wheel hardness on adhesion rate

        Use a grinding wheel with white corundum as the abrasive, particle size 46, and hardness levels H, J, K, and L respectively to grind the specimen with a grinding stroke 

of 600 mm and detect the adhesion rate. The higher the hardness of the grinding wheel, the more serious the adhesion will be. This is due to the fact that for grinding wheels 

with low hardness, the abrasive grains tend to fall off the surface of the grinding wheel under the action of grinding force, forming a new chip space that is not easily blocked.

        3---The influence of abrasives on adhesion rate

        Commonly used grinding wheel abrasives include white corundum and green silicon carbide. Experiments show that there is little difference in the impact of the two 

abrasives on the adhesion rate. Green silicon carbide can slightly reduce the adhesion phenomenon because it is brittle and sharp.

        4---The effect of grinding fluid on surface roughness

        Three emulsions were used, inorganic salt grinding fluid and oil-based grinding fluid, and extreme pressure additives such as sulfur and chlorine were added to observe 

the surface roughness of the workpiece after processing. The flow rate of the grinding fluid was 20L/min and the grinding stroke is 600mm.

        It can be seen that the surface tension is small, it contains extreme pressure additives, and the surface quality obtained by grinding is good. Reasonable use of grinding 

fluid can improve heat dissipation conditions. Grinding fluid can wash away grinding chips and fallen abrasive particles, and at the same time form an oil film on the metal 

surface to lubricate and reduce the surface roughness of the workpiece.

        5---The influence of grinding dosage on adhesion rate

        The workpiece speed, feed amount and grinding depth have little impact on processing, and changes in grinding depth have little impact on the adhesion rate.

        in conclusion

        1) When grinding stainless steel, reducing the adhesion and blockage of the grinding wheel is an important factor in improving grinding efficiency. The grinding wheel 

must be trimmed frequently during processing to keep the cutting edge sharp.

        2) The main goal is to choose a grinding wheel with good self-sharpening properties for grinding stainless steel. Generally, a grinding wheel with low hardness is 

effective, but the hardness cannot be too low, otherwise the abrasive grains will fall off before being blunted. It is recommended to choose J grade.

        3) In order to reduce the adhesion and blocking of the grinding wheel during grinding, a coarse-grained grinding wheel should be used. For coarse grinding, use No. 36 

and No. 46 grit, and for fine grinding, use No. 60 grit.

        4) When grinding stainless steel, using GC grinding wheels can improve grinding efficiency.

        5) The selection of grinding fluid must take into account both lubrication and cleaning functions, and the supply must be sufficient. Emulsions with low surface tension 

and extreme pressure additives can be used to obtain high surface quality.

        6) The selection of grinding amount can be determined based on the machining allowance.

        7) During the experiment, it was found that the structure and bonding agent of the grinding wheel have a certain impact on the grinding process of stainless steel. 

Currently, it is limited by experimental means and needs further research.