Precision grinding machining curved blade profile
The blade curved surface finishing is to ensure that the curved surface roughness and waviness meet the design requirements. The material properties of the material are not changed, and the geometry and positional accuracy obtained by the milling process are not substantially changed during the processing. For the actual machining, the blade curved surface finishing is to achieve the required roughness and waviness on the basis of removing the residual machining marks. The amount of single-sided metal removal at each location on the curved surface shall not exceed 0.05 mm.
At present, the use of CNC abrasive belt grinding and polishing machine for blade bending surface finishing is a mature method for practical processing. NC utilize diamond wheel grinding machine for finishing the blade surface of the light-curved manner, is a method of application you are trying. These processing methods reason is because they choose to apply different characteristics.
First of all, for the numerical control belt grinding and polishing machine processing method, it has the following characteristics:
1. Abrasive belt grinding sharp and sharp grinding efficiency, has reached 10 times of milling and 5 times of ordinary grinding wheel grinding;
2. Abrasive belt grinding and workpiece friction are less, and grinding heat is less. The belt has a large circumference and a long interval of heat dissipation of the abrasive grains, and it is easy to obtain complete cooling of the air and the cutting fluid, which can effectively reduce deformation of the workpiece, avoid burns and ablation;
3. The softness of the belt itself and the rubber body structure on the surface of the working wheel ensure that the belt is ground and the workpiece is in flexible contact, which has better running and polishing effect;
4. Abrasive belt grinding has a stable size of grinding tools. Since the belt is attached to the working wheel for grinding, the size of the grinding tool has good stability;
5. Abrasive belt grinding can not remove large blanks for a long time. The abrasive belt contains a limited amount of abrasive, and the long-term processing of the large amount of removal will cause the abrasive to be quickly consumed, and the processing needs to be interrupted for the replacement of the abrasive belt.
The motion function of the six-axis CNC belt grinding and polishing machine is similar to the five-axis CNC machining center during milling. The structural difference between the abrasive belt grinding wheel and the end milling cutter makes it necessary to have a swing angle function in two directions in the processing of the curved surface surface to adapt to the blade structure.
The six-axis CNC belt grinding and polishing machine has the dual functions of curved surface grinding and polishing. The functional transformation depends on the transformation of the power head in the form of rigid grinding and floating grinding. During the polishing process, the constant pressure floating mechanism is activated, and the change of the grinding forward pressure can be accurately controlled by a pressure sensor, a grinding power sensor, a constant pressure cylinder or the like. It can adapt to the difference of the range of the curved surface of each piece of the blade, and realize the polishing process without destroying the precision of the curved surface. When the curved surface grinding is performed, the contact wheel floating mechanism is locked, and the rigid grinding of the curved surface can be performed. The rigid grinding of the curved surface can complement or replace the precision of the finishing of the curved surface. The size of the belt used should be changed according to the margin. This type of machining will change the original dimensional position accuracy, and the excessive margin removal will result in greater stress deformation than milling. Therefore, the grinding function is not recommended under the premise that the milling has the ability to ensure accuracy.
The robot numerical control belt polishing method is performed by the robot holding the blade under the program control, and polishing on a fixed belt machine. Its processing utilizes reverse engineering techniques. Before processing, the robot takes the blade head part to scan the contour of the blade profile, and then the data processing mechanism generates the machining control program, and finally realizes the blade polishing process under the program control. At present, the grinding method of the robot belt is limited by the motion precision, and is generally only used as a means of polishing the curved surface.
At present, the numerical control abrasive belt grinding and polishing machine method is becoming the most suitable method for large-blade curved surface polishing processing because of its many advantages. Its comprehensive advantages are also characterized by both dry and wet grinding, as well as ultra-low temperature grinding in CO2 cooling. This is very advantageous for avoiding burns and ablation of the curved surface of the large titanium alloy material. The application of CNC grinding and polishing machine tools has changed the labor intensity of large-blade curved surface manual polishing, which plays an important role in the improvement of large blade production efficiency.
The development and application of multi-axis linkage processing technology has greatly improved the precision and quality assurance capability of the large-scale engine fan blade profile processing, and achieved satisfactory results in processing efficiency. It is believed that with the continuous research and improvement of process equipment technology, the processing technology of large fan blade curved surface will be developed towards mechanization and automation.
At present, the use of CNC abrasive belt grinding and polishing machine for blade bending surface finishing is a mature method for practical processing. NC utilize diamond wheel grinding machine for finishing the blade surface of the light-curved manner, is a method of application you are trying. These processing methods reason is because they choose to apply different characteristics.
First of all, for the numerical control belt grinding and polishing machine processing method, it has the following characteristics:
1. Abrasive belt grinding sharp and sharp grinding efficiency, has reached 10 times of milling and 5 times of ordinary grinding wheel grinding;
2. Abrasive belt grinding and workpiece friction are less, and grinding heat is less. The belt has a large circumference and a long interval of heat dissipation of the abrasive grains, and it is easy to obtain complete cooling of the air and the cutting fluid, which can effectively reduce deformation of the workpiece, avoid burns and ablation;
3. The softness of the belt itself and the rubber body structure on the surface of the working wheel ensure that the belt is ground and the workpiece is in flexible contact, which has better running and polishing effect;
4. Abrasive belt grinding has a stable size of grinding tools. Since the belt is attached to the working wheel for grinding, the size of the grinding tool has good stability;
5. Abrasive belt grinding can not remove large blanks for a long time. The abrasive belt contains a limited amount of abrasive, and the long-term processing of the large amount of removal will cause the abrasive to be quickly consumed, and the processing needs to be interrupted for the replacement of the abrasive belt.
The motion function of the six-axis CNC belt grinding and polishing machine is similar to the five-axis CNC machining center during milling. The structural difference between the abrasive belt grinding wheel and the end milling cutter makes it necessary to have a swing angle function in two directions in the processing of the curved surface surface to adapt to the blade structure.
The six-axis CNC belt grinding and polishing machine has the dual functions of curved surface grinding and polishing. The functional transformation depends on the transformation of the power head in the form of rigid grinding and floating grinding. During the polishing process, the constant pressure floating mechanism is activated, and the change of the grinding forward pressure can be accurately controlled by a pressure sensor, a grinding power sensor, a constant pressure cylinder or the like. It can adapt to the difference of the range of the curved surface of each piece of the blade, and realize the polishing process without destroying the precision of the curved surface. When the curved surface grinding is performed, the contact wheel floating mechanism is locked, and the rigid grinding of the curved surface can be performed. The rigid grinding of the curved surface can complement or replace the precision of the finishing of the curved surface. The size of the belt used should be changed according to the margin. This type of machining will change the original dimensional position accuracy, and the excessive margin removal will result in greater stress deformation than milling. Therefore, the grinding function is not recommended under the premise that the milling has the ability to ensure accuracy.
The robot numerical control belt polishing method is performed by the robot holding the blade under the program control, and polishing on a fixed belt machine. Its processing utilizes reverse engineering techniques. Before processing, the robot takes the blade head part to scan the contour of the blade profile, and then the data processing mechanism generates the machining control program, and finally realizes the blade polishing process under the program control. At present, the grinding method of the robot belt is limited by the motion precision, and is generally only used as a means of polishing the curved surface.
At present, the numerical control abrasive belt grinding and polishing machine method is becoming the most suitable method for large-blade curved surface polishing processing because of its many advantages. Its comprehensive advantages are also characterized by both dry and wet grinding, as well as ultra-low temperature grinding in CO2 cooling. This is very advantageous for avoiding burns and ablation of the curved surface of the large titanium alloy material. The application of CNC grinding and polishing machine tools has changed the labor intensity of large-blade curved surface manual polishing, which plays an important role in the improvement of large blade production efficiency.
The development and application of multi-axis linkage processing technology has greatly improved the precision and quality assurance capability of the large-scale engine fan blade profile processing, and achieved satisfactory results in processing efficiency. It is believed that with the continuous research and improvement of process equipment technology, the processing technology of large fan blade curved surface will be developed towards mechanization and automation.
