The positioning accuracy of CNC lathes can be understood as the motion accuracy of the machine tool. Ordinary machine tools use manual feed, and the positioning accuracy is mainly determined by the reading error. The movement of the CNC machine tool is realized by digital program instructions, and the positioning accuracy is determined by the CNC system and mechanical transmission error. The movement of each moving part of the machine tool is controlled by a CNC device. The accuracy of each moving Cnc Machining Pure Aluminum Alloy Parts under the control of program instructions directly reflects the accuracy of the processing components. Therefore, positioning accuracy is an important detection content.
The positioning accuracy of a CNC lathe is the positioning accuracy that can be achieved by the movement of each coordinate axis of the machine tool under the control of the index control device. The positioning accuracy of CNC lathes can be understood as the motion accuracy of the machine tool. The following mainly introduces the linear motion positioning accuracy of CNC lathes:
1. Detection of linear motion positioning accuracy.
The linear motion positioning accuracy is generally performed under no-load conditions of the machine tool. According to the requirements of the National Standards and Standardization Organization (ISO), laser measurement should be used to detect the PLM system. In the absence of a laser, a standard scale coupled with an optical reading microscope can be used for comparative measurements by the average user. However, the accuracy of the measuring instrument must be 1-2 levels higher than the measurement accuracy. In order to reflect all errors in multi-point positioning, each anchor point in the ISO standard calculates the average value and scattering band of each anchor point based on five measured data. .
2. Linear motion repetitive positioning accuracy detection
The test instrument is the same as the positioning accuracy measuring instrument. The general detection method is to measure at any three positions near the midpoint of each coordinate stroke and at both ends. Each position is located by rapid movement, repeated 7 times under the same conditions. Measure the stop position value and calculate the difference in readings. Taking half of the difference between the three positions of positive and negative signs as the repeated positioning accuracy of the coordinates is a more basic indicator that reflects the accuracy and stability of the axis motion.
3. Inspection of cutting accuracy
It also includes errors and measurement errors caused by various factors such as sample material, ambient temperature, decimal control lathe tool performance, cutting conditions, etc. Cutting accuracy inspection can be divided into single processing accuracy inspection and standard comprehensive sample accuracy inspection. Except for special requirements, the material for cutting test parts is generally made of primary Ductile Cast Iron cnc machining, and carbide tools are used to cut according to standard cutting quantities.