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Spontaneous combustion is the burning of a substance on its own without an immediate cause. Under suitable conditions, when a large amount of metal powder comes into contact with a small amount of oil and is exposed to air, spontaneous combustion can easily occur. Moist conditions often exacerbate spontaneous combustion; the formation of vapor can be seen among the metal debris, which is a precursor to spontaneous combustion. If there is enough organic material, such as oil, new cuts and wet debris can cause a fire. New cutting debris exposes fresh metal surfaces, which can react under certain conditions. The chips of the same metal undergo oxidation, generating heat; unlike other metals, no hydrogen is produced, and instead smoldering and ignition occur within the pile of chips. Metalworking fluids can help or hinder these reactions. The following steps can prevent the debris from catching fire spontaneously: dry it out (if possible) or use centrifugation to reduce or eliminate the metal cutting fluid on the debris ； Spread debris over a large area or use circulating air to blow away piles of debris/dust ； Using metal machining fluids with a high mineral oil content can reduce the likelihood of spontaneous combustion ； If a flammable emulsion is already being used, the concentration used can be increased ； Spraying a water-based rust inhibitor on the surface of the debris pile is also helpful. For the central channel system, if dirt keeps circulating, it indicates a malfunction in the filtration system. Auxiliary settling agents compatible with metal machining fluids and filtration systems can be selected to help settle debris. Check the pressure of the machining fluid nozzle to determine whether insufficient pressure is causing debris to accumulate on the fixture or the workpiece. The typical pressure for metal machining fluids is 137.9 kPa.