Copper, one of the most widely used metal materials, also occupies a very important position in industrial production. Cutting copper is also to expand its application. However, copper encounters many difficulties when cutting, so this copper machining Can cutting fluids face up to difficulties? Let’s take a look!
Difficulties in copper machining
Copper has poor workability, but excellent casting properties. It has the characteristics of work hardening during copper machining, that is, as the machining speed increases, the plasticity decreases, the strength increases, and the deformation difficulty increases.
The choice of copper cutting fluid
The choice of cutting fluid needs to be selected according to the copper machining method as follows:
Copper machining method
High-speed cutting and drilling. High-speed cutting generates a lot of heat. If the cutting fluid cannot take away the heat in time, a series of problems will occur, such as sticking to the tool and the tool’s built-up edge, which affects the service life of the tool, and the workpiece will also suffer a certain amount of wear and damage the workpiece Surface accuracy, for this cutting fluid needs to have good lubrication performance and excellent cooling, such as this semi-synthetic stamping copper sheet cutting fluid or copper machining cutting fluid.
Grinding machining. The grinding debris is very small and generates a lot of heat during the grinding process. In addition to considering the lubricity and cooling properties of the cutting fluid, the sedimentation of the cutting fluid also needs to be considered. Chips will not adhere to the tool or workpiece as the cutting fluid settles, which will affect the accuracy of cutting And the smoothness of the workpiece surface. Then you need this special cutting fluid for copper machining.
Turning. The cutting depth and feed rate of turning copper-cut alloy materials are the same as those of ordinary steel turning, and cutting fluid is usually not added. 3%~5% emulsion can also be used for turning brass materials.
Maintenance of copper cutting fluid
Cutting fluid has four major properties: cleaning, rust prevention, lubrication and cooling. Among them, rust prevention is very important for cutting copper materials, because copper materials are easily corrosive materials and are easily chemically decomposed with environmental media or cutting fluids. After the reaction, copper ions are precipitated to produce verdigris and patina. For this reason, attention should be paid to the selection of cutting fluid.
The special cutting fluid for copper materials that has been recommended to you, keep it away but also maintain it:
Method of maintaining cutting fluid for copper machining
- Timely filter the fine chips generated during machining. Because copper and its alloys easily react to form aluminum soap under alkaline conditions, the stability of the cutting fluid is destroyed. In order to avoid the reaction between the copper chips and the cutting fluid that affects the use effect and service life of the cutting fluid, the copper chips should be filtered immediately. The copper chips produced during the grinding process are small and light, and difficult to precipitate. Unfiltered copper scraps will be brought to the machining area and affect the gloss of the processed surface.
- Always pay attention to changes in pH. Since copper materials are very sensitive to the pH value of the cutting fluid, it is necessary to regularly check the pH value of the cutting fluid of copper and its alloys. If an abnormality is found, it should be adjusted in time and the pH should be controlled between 8-9 to avoid corrosion due to high pH or low pH to cause bacteria to multiply, which will affect the stability and performance of the cutting fluid.
- Add new fluid regularly. It can not only ensure the good lubrication performance of the cutting fluid, but also prolong the service life of the fluid to extend the service life of the working fluid.
For cutting copper materials, you can use this copper cutting fluid. It is suitable for high-speed and low-speed operation. It has good lubricity, silky feel, reduces tool wear, good cooling performance, timely removal of heat, and improves workpiece surface accuracy and cleaning. Good, clean the debris without residue,