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Problems and countermeasures in the process of stainless steel grinding

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Problems and countermeasures in the process of stainless steel grinding

May 22, 2019

In order to meet the requirements of surface quality and machining accuracy of stainless steel parts, grinding method is usually adopted. Due to the high toughness, low thermal conductivity and small elastic modulus of stainless steel, the following problems often exist in the grinding process :1) the grinding wheel is easy to stick and block; 2) the processed surface is easy to burn; 3) serious machining hardening; 4) the workpiece is easy to deform.

From the above we can see that the choice of grinding wheel and grinding fluid directly affects the grinding efficiency and machining accuracy. The factors affecting adhesion blockage and surface roughness were studied experimentally.

Influence of grinding wheel size on adhesion rate.

The selected four grinding wheels of white corundum, hardness K and particle size 36, 46, 60 and 80 respectively were used for cylindrical longitudinal grinding of the specimen. The grinding length was 600mm and the adhesion rate was detected. The finer the grinding wheel, the more serious the adhesion. However, the finer the grinding wheel is, the smaller the cavity will be. The grinding wheel will soon lose the chip space, causing blockage.

Effect of hardness of grinding wheel on adhesion rate.

The grinding wheels of white corundum with particle size 46 and hardness of H, J, K and L were selected to grind the specimens. The grinding stroke was 600mm and the adhesion rate was tested. The higher the hardness of the grinding wheel, the more serious the adhesion. This is because of the low hardness of the grinding wheel, grinding particles in the grinding force, easy to fall off from the surface of the grinding wheel, forming a new chip space, not easy to plug.

The influence of abrasive on the adhesion rate.

There are two kinds of common grinding wheel abrasives: white corundum and green silicon carbide. The experiment shows that the two kinds of abrasives have little difference on the adhesion rate.

Effect of grinding fluid on surface roughness.

Three kinds of emulsions, inorganic salt grinding fluid and oil-based grinding fluid were used respectively. Sulfur, chlorine and other extreme pressure additives were added to observe the surface roughness of the workpiece after processing. The flow rate of grinding fluid was 20L/min and the grinding stroke was 600mm.

It can be seen that the surface tension is small, containing extreme pressure additives, the surface quality obtained by grinding is good. Reasonable use of grinding fluid, can improve the heat dissipation conditions, grinding fluid can be grinding chips and off the abrasive particles, at the same time in the metal surface to form an oil film, lubrication, reduce the workpiece surface roughness.

Effect of grinding dosage on adhesion rate.

As can be seen from table 1 and 2, the change of grinding depth has little influence on the adhesion rate.

Finally, we get:

When grinding stainless steel, reducing the adhesion block of grinding wheel is an important factor to improve grinding efficiency.

2) grinding stainless steel grinding wheel is the main target of self-sharpening good grinding wheel, generally choose low hardness grinding wheel effect is good, but also can not choose the hardness is too low, otherwise the grinding particles will fall off. Grade J is recommended.

3) in order to reduce the adhesion block of grinding wheel during grinding, coarse-grained grinding wheel should be selected. Coarse grinding with 36, 46 particle size, fine grinding with 60 particle size.

4) GC wheel can improve grinding efficiency when grinding stainless steel.

5) grinding fluid selection must take into account both lubrication and cleaning, sufficient supply, can choose small surface tension, emulsion containing extreme pressure additives, can get high surface quality.

6) the selection of grinding amount can be determined according to the machining allowance.

7) during the experiment, it was found that the structure of the grinding wheel and the bonding agent had a certain impact on the grinding process of stainless steel. Currently, it is limited by the experimental means, which needs to be further studied.

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