Comparison of cutting efficiency depending on the pressure and amount of abrasive material

28.11.2014

Dear customers,

We have prepared a comparison of cutting performance with three different  pumps, resp. three pressure levels.

• 3 800 bar

• 4 130bar

• 6 200bar

The attached chart shows the variation of the cutting speed (řezná rychlost - mm/min) depending on the amount of abrasive (množství abraziva - g/min), but also lesser known facts that the higher pressure does not always mean better performance and user´s benefit.

The graph shows that a small amount of water - about 2.3 liters per minute at a pressure of 6200 bar - is no longer able to "work" with more abrasive. Flat peak occurs already at amounts of about 500 grams per minute. Larger quantity of cutting water - about 3.7 liters per minute at a pressure of 4130 bars - allows to use more abrasive material resulting in higher cutting speed. And this fact is commonly used e.g. for stronger material (higher thickness).

Please have in your mind a commonly used mistake or inaccuracy - it's not the water that cuts, but it is an abrasive material that grind. The physical nature of this process is grinding, not cutting. A larger amount of abrasive also brings higher "cutting" (or grinding) performance. Of course, the speed of abrasive grains is an important factor which dominates by several percent in a narrow amount of abrasive in the range of about 250-480 grams per minute.