Mathematics model of beryllium copper alloy turning and milling roughness
Using the orthogonal test method, the contour cutting test of the copper-coated C17200 specimen was designed and implemented, and the roughness mathematical model of the spherical milling cutter under the contour cutting mode was constructed by using the exponential function. Based on the orthogonal cutting test data, the mathematical model of surface roughness of copper plating C17200 was deduced and solved by using MATALB software. Comparing the calculated roughness theoretical value with the actual measured value obtained by the test, the results show that the error of the roughness mathematical model can be controlled at about 10%, which has a good guiding significance for actual production
Application of beryllium copper alloy
Beryllium copper alloy is a wrought and castable alloy, which is a copper-based alloy strengthened by aging precipitation. After quenching and aging treatment, it has high strength and hardness, and good stability. It has corrosion resistance, wear resistance, fatigue resistance, and A series of advantages such as magnetic properties and thermal conductivity. Due to the many advantages of beryllium copper materials, the proportion of beryllium copper used in high-end molds has also increased in recent years. The molding time of beryllium copper mold parts is only 1/3~1/2 of steel mold, while the service life of beryllium copper mold can reach more than 5~6 times of steel mold. With the transformation and upgrading of my country’s manufacturing industry, the application of beryllium copper in high-end precision molds will become more and more extensive. Therefore, the research and promotion of beryllium copper precision milling processing technology plays an important role in improving the manufacturing level of my country’s high-end molds.
Construction of Surface Roughness in High Speed Turning and Milling of Beryllium Copper
Surface roughness is an important index to measure the performance of the cutting process and evaluate the surface quality of parts. It is a comprehensive reflection of the influence of cutting parameters and system variables in the cutting system on the cutting process. The establishment of a surface roughness prediction model based on china cnc machining parameters has been received. extensive attention of researchers at home and abroad. There are many theories and methods to study surface roughness. This paper is based on the orthogonal cutting test method to study the surface roughness model of copper plating. Orthogonal test method is to use a neat orthogonal table to carry out overall design, comprehensive comparison and statistical analysis of the test, balance sampling within the range of factor changes, find the main problems in the influencing factors with as few tests as possible, and then draw guidance The correct conclusion of production practice
Test method for beryllium copper milling
1. Verification materials
The workpiece material used in the test is imported beryllium copper, and the grade is beryllium copper C17200. The hardness of beryllium copper is 38~44HRC, the tensile strength is 1160~138OMPa, the density is 8.3g/cm3, and the thermal conductivity is 105W/ (m K). Its chemical composition is shown in Table 1
- Be: 1.9o-2.15
- CO: 0.35-0.65
- Ni: 0.20-0.25
- Si: <0.15
- Fe: <0.15
- Al: <0.15
- Cu: balance
2. CNC Machining equipment and measuring instruments
The CNC machine tool adopts a double turntable five-axis linkage machining center produced in Taiwan, China, the model is HBCL1160H, and the maximum speed can reach 30000r/min. The milling tool adopts a carbide spherical milling cutter with a diameter of 6 mm and two-edged TiAIN coating. In the test, SRT6200 portable surface roughness meter is used to measure the processed surface. The sampling length L of this measuring instrument can be selected according to the measurement needs, and there are 0.25, 0.8, and 2.53 levels of sampling length.
3. Test method
Test method In the test, down milling and cutting fluid cooling were used for processing. The cutting track of the tool was in the contour cutting mode, and the radial cutting width was 0.12mm. UG8.0 software was used to program the CNC tool path.
4. Test results and analysis
The surface roughness of the test piece was measured after cutting. Due to the uncertainty of the measurement, in order to reduce the measurement error, the average value of three measurements was used here to measure the surface roughness at the three marks of the test piece respectively. The average value of the three measurements is taken as the evaluation result of the surface roughness of the specimen after processing.
Beryllium copper milling test conclusion
The analysis, control and simulation of machined surface quality is an important aspect of industrial texture analysis. Establishing a simulation model of machined surface quality can not only create conditions for virtual manufacturing, lay the foundation for surface performance analysis, but also optimize machining parameters. Provides important references.
In this paper, by analyzing the characteristics of the influencing factors of the surface roughness of beryllium copper in the contour milling mode, a surface roughness simulation model is proposed, and the mathematical model of the surface roughness of beryllium copper is derived and solved by using the orthogonal cutting test data and MATLAB software. The model is established based on process parameters, and the accuracy can be controlled at about 10%, so it can be used to optimize the actual cutting parameters, so as to improve the production efficiency of beryllium copper molded parts while ensuring the processing quality.