Coolant-Foaming

Problem Description Foaming in high-pressure coolant systems is a persistent issue in deep hole drilling. I have watched a perfectly good 80-bar coolant system turn into a frothy mess that could not clear chips from a 12 mm hole. The air bubbles compress under the high pressure and expand at the nozzle, reducing the effective cooling and lubrication at the cutting zone. When the coolant aerates, chip evacuation is the first thing to fail. ...

Problem Description Foaming robs a high-pressure coolant system of its ability to evacuate chips. The air bubbles in foam take up volume that should be occupied by liquid coolant. I’ve watched a foaming system lose 35% of its chip-carrying capacity — the chips stopped flowing out of the bore and started packing. In deep hole drilling, where chip evacuation depends entirely on coolant flow, foaming is one of the most disruptive problems you can encounter. ...