What determines the accuracy of CNC CNC machining parts

In CNC machining programming, correct usage and skills are important for ensuring and improving machining accuracy of CNC machine tools. So what determines the accuracy of CNC machining? The machining accuracy of the CNC machine tool is determined by the position detecting element, and the position detecting element is composed of the detection element (sensor) and the signal processing device, which is an important part of the CNC machine closed-loop servo system.

The function is to detect the actual value of the table position and speed, and feed back the feedback signal to the digital control device or the servo device to form a closed loop control. Detecting elements are typically detected by light or magnetic principles to complete location or speed.

The position detecting element is divided into a direct measuring element and an indirect measuring element according to the Precision CNC Machining detection method. When the linear movement of the machine tool is generally used, a straight line detecting element is generally measured, and a direct measurement is called a full closed loop control. The measurement accuracy depends primarily on the accuracy of the measurement element, and is not affected by the transmission accuracy of the machine.

As the linear displacement of the machine table is proportional to the rotation angle of the drive motor, the moving distance of the table can be indirectly measured by driving the rotation angle of the motor or the screw. This method is called indirect measurement, and the position closed loop control is referred to as a semi-closed loop control. The measurement accuracy of CNC machining depends on the accuracy of the detecting element and the machine feed transmission chain. The machining accuracy of the closed-loop CNC machine is largely dependent on the accuracy of the position detecting device. CNC machine tools are very strict on position detection components, and its resolution is typically between 0.001-0.01 mm or smaller. The damaged probability is higher than the damage of the cable assembly. If you suspect a failure of the detection element, you must first check if the wireless network cable has a broken line, stain, deformed, and so on. By measuring its output, it can determine the quality of the detection element, that is, the requirements must be grasped and output signals. What should I do if I do an example to explain, such as detecting a device failure and mechanical oscillation (acceleration / deceleration)?

1) Pulse encoder fault. At this time, check whether the feedback line terminal voltage on the speed unit drops to a certain point. If the voltage drops, the pulse encoder is poor and the encoder should be replaced.

2) Pulse encoder cross-coupling may be damaged, resulting in unread and detection speeds, couplings More articles are derived from www.szvmt.com If you have help, please pay attention to thank you