Different cutting processes require different odorless cutting oils.

The larger the rough-turning allowance, the deeper the cutting depth, the greater the feed resistance, and the more cutting heat generated. This leads to more severe tool wear. Timely removal of cutting heat can help lower the cutting temperature, thereby extending tool life. In general, emulsification performance is relatively good. The present invention not only boasts excellent cooling performance but also exhibits superior lubricity. When using water-based, odorless cutting oil, attention should be paid to maintaining the surface of the machine tool’s guideways. Before starting work, the odorless cutting oil should be placed on the workbench to dry and then evenly applied.

During finish machining, the cutting allowance is small, and the cutting depth typically ranges only from 0.05 to 0.8 mm. The feed rate is also low, so it is crucial to ensure both the dimensional accuracy and surface roughness of the workpiece. Since the cutting forces are relatively low and the temperature remains moderate, it is advisable to use cutting oils that are odorless, have a low coefficient of friction, and offer excellent lubrication performance. Generally, it is recommended to employ highly concentrated emulsions (mass fraction > 10%) or odorless cutting oils supplemented with oil additives. For turning operations requiring high precision—such as fine threads—vegetable oils like rapeseed oil, soybean oil, or other similar products can be used as lubricants to meet the stringent precision requirements. As mentioned above, due to the poor stability and easy oxidation of vegetable oils, some factories have adopted a combination of 15% JQ-1 fine-cutting lubricant (by mass fraction) and 85% L-AN32 total-loss system oil as a fine-cutting oil, which has proven highly effective. The boring process is similar to turning in terms of machining principles; however, since boring involves internal hole machining, the cutting volume and cutting speed are relatively low, yet heat dissipation conditions are poorer. Emulsions can serve as odorless cutting oils, and when used, the flow rate and pressure of the odorless cutting oil should be appropriately increased. Milling is an intermittent cutting process, during which the cutting depth per tooth varies continuously, making it prone to vibration and generating certain impact forces. Consequently, milling conditions are generally more challenging than turning. When high-speed steel tools are used for high-speed horizontal or vertical milling, the odorless cutting oil must exhibit good cooling performance along with adequate lubrication, such as extreme-pressure emulsions. For low-speed milling, lubricating cutting oils are required, including fine-cutting oils and non-active extreme-pressure cutting oils. For stainless steels and heat-resistant alloy steels, cutting oils containing sulfur and chlorine additives can be employed.

During metal cutting operations, the workpiece comes into direct contact with corrosive media—such as sludge that can decompose or oxidize and deteriorate due to interactions with various environmental media and odorless cutting oil components—leading to corrosion. Similarly, the surface materials of machine tool components that come into contact with odorless cutting oil may also suffer from corrosion. Furthermore, during temporary storage of workpieces after machining or during their movement and management within a manufacturing facility, the odorless cutting oil must possess certain anti-rust capabilities to prevent corrosive substances—such as residual sludge from the environment and the odorless cutting oil itself—from eroding the metal surfaces. Particularly during the humid and rainy seasons in southern regions, special attention should be paid to implementing appropriate rust-prevention measures at each stage of the production process. In addition to these critical functions, the odorless cutting oil used should exhibit excellent stability, ensuring that it does not undergo precipitation or layering during storage and use, and that it remains free from issues such as oil separation, soap formation, and aging. It should also demonstrate resistance to bacteria and mold, making it less prone to fungal growth and biochemical degradation, which could otherwise lead to unpleasant odors and product deterioration. Moreover, it should cause no damage to painted surfaces, pose no harm to human health, and be completely odorless. During application, it produces little to no smoke, mist, or fumes. It is easy to recycle, generates low levels of pollution, and its waste liquid can be treated using simple methods, allowing it to meet the national comprehensive emission control standards for industrial and domestic wastewater.