Coolant selection and application in the machining process of double disc grinding machine

In the machining process of double disc grinding machine, the selection and application of coolant is crucial, which directly affects the machining quality, tool life, productivity, and machining costs and other aspects.

First of all, the main role of the coolant includes cooling, lubrication, cleaning and rust prevention. The cooling effect is to take away the large amount of heat generated during the grinding process, preventing the workpiece and tool from overheating, thus avoiding thermal deformation and burns. Lubrication reduces the friction between the tool and the workpiece, reduces the grinding force, improves surface quality, and extends tool life. Cleaning helps to remove chips and abrasive debris generated by grinding, preventing them from scratching the surface of the workpiece or affecting machining accuracy. The anti-rust effect protects the workpiece and machine tool from rust and corrosion during and after machining.

There are several factors to consider when selecting a coolant. The nature of the grinding material is one of the key factors. For materials with high hardness, such as hardened steel, it is necessary to select a coolant with good cooling performance to effectively reduce the grinding temperature. For soft materials such as aluminium alloys, a coolant with better lubricating properties should be selected to prevent the material from sticking to the tool. Grinding process parameters also affect the choice of coolant. When grinding at high speeds, coolants with stronger cooling capacity are needed because more heat is generated. Whereas in low-speed grinding, lubricating properties may be more important.

Different types of coolants have their own characteristics. Water-soluble coolants offer good cooling and cleaning properties at a relatively low cost, but may be a little less rust-resistant. Oil-based coolants offer excellent lubrication and rust protection, but may not be as effective at cooling and cleaning as water-soluble coolants and may be more costly. Synthetic coolants combine the best of both worlds and offer a more balanced performance, but are usually more expensive.

When applying coolant, pay attention to the reasonable flow rate and pressure. Flow is too small, can not give full play to the role of the coolant; flow is too large, it may cause waste and environmental pollution. The pressure should be adjusted according to the grinding depth, wheel speed and other factors to ensure that the coolant can be accurately sprayed into the grinding area.

In addition, the temperature of the coolant needs to be controlled. Generally speaking, low-temperature coolant can play a better role in cooling, but too low a temperature may lead to thermal deformation of the workpiece and machine tool. Therefore, the appropriate coolant temperature needs to be selected according to the specific machining situation.

Regular replacement of coolant is also essential. Coolant used for a long time will affect the machining effect because of the mixing of impurities and the decline in performance, and regular replacement can ensure that the coolant always maintains good performance.

In short, in the process of double disc grinding machine, scientific and reasonable selection and application of coolant, can effectively improve the processing quality and efficiency, reduce costs, extend the service life of equipment and tools.