In modern manufacturing, the accuracy of CNC machines directly affects the quality and performance of products. So, how to effectively check the accuracy of CNC machines?
First, the standard test piece detection method can be used. This is a common and practical method to evaluate the accuracy of CNC machines by processing standard test pieces of specific design, such as international standard or industry standard test pieces. These test pieces usually contain features of various shapes and sizes, such as planes, cylindrical surfaces, conical surfaces, threads, and various complex contours. After processing, high-precision measuring instruments, such as three-coordinate measuring machines, are used to measure the dimensional accuracy, shape accuracy, and position accuracy of the test pieces in detail. For example, the diameter tolerance of the cylindrical surface, the flatness of the plane, the pitch error of the thread, and the position tolerance between different features are measured. If the measurement results deviate very little from the design requirements of the standard test piece, it indicates that the accuracy of the CNC machine is in good condition. During the production process, Airy Precision Machinery will regularly use standard test pieces to test its CNC equipment, and adjust the machine tool parameters in time according to the test data to ensure that the processing accuracy always meets the requirements of high-quality production.
Laser interferometer measurement is also an important means of checking the accuracy of CNC machines. Laser interferometer can accurately measure the displacement, velocity and acceleration of the moving parts of machine tools. It uses the wavelength stability and interference principle of lasers to measure the changes in the interference fringes of the laser beam during the movement of the machine tool, calculate the actual displacement of the moving parts, and compare it with the command value set by the CNC system. For example, when checking the positioning accuracy of the linear axis of a CNC machine tool, the laser interferometer can detect the positioning errors of the X, Y, and Z axes at different positions, as well as the repeated positioning errors during the movement. Airy Precision Machinery is equipped with advanced laser interferometers. Its technicians are proficient in the use of the instrument and can accurately analyze the measurement data and compensate for the machine tool's lead screw pitch error, backlash, etc., thereby effectively improving the positioning accuracy and motion accuracy of the machine tool.
Ballbar testing focuses on evaluating the accuracy performance of the two-axis linkage of CNC machines. The ballbar consists of a retractable rod and ball heads at both ends. A ball seat is installed on the workbench of the machine tool, one end of the ballbar is fixed to the spindle, and the other end is connected to the ball seat. When the machine tool performs two-axis linkage processing, the ballbar will deform with the movement of the machine tool. By measuring the deformation and angle change of the ballbar, we can get information such as the roundness error, contour error and gain matching of each axis when the machine tool is in two-axis linkage. This detection method is very effective for checking the accuracy problems when processing complex curves and surfaces. Airy Precision Machinery uses ballbars to regularly detect its multi-axis linkage CNC machining centers, and optimizes the control system parameters of the machine tool based on the test results to ensure that excellent accuracy requirements can be achieved when processing high-precision molds and aerospace parts.
In addition, temperature stability tests can also be performed. Temperature changes can have a significant impact on the accuracy of CNC machines, especially high-precision machine tools. When checking accuracy, it is necessary to monitor the temperature distribution of the machine tool under different working conditions and ambient temperatures, as well as the impact of temperature changes on machining accuracy. For example, use temperature sensors to measure the temperature changes of key parts such as the machine tool spindle, lead screw, and bed, and observe whether the temperature increase causes the part size deviation to increase during long-term continuous operation. Airui Precision Machinery has effectively reduced the interference of temperature on precision by building a constant temperature and humidity processing workshop and equipping the machine tools with a temperature compensation system. At the same time, temperature factors will also be taken into consideration during the precision inspection process to ensure the precision stability of the machine tools in the actual production environment.
Checking the precision of CNC machines requires the comprehensive use of multiple methods and tools, and regular inspection and maintenance are required. Airui Precision Machinery has set a good example in this regard. Through rigorous precision inspection processes and professional technical means, it continuously optimizes the performance of its CNC machines, laying a solid foundation for the production of high-precision and high-quality products, and maintaining its leading competitiveness in the field of precision manufacturing.
