The positioning precision of the CNC machine-tool refers to the position accuracy which can be obtained by the coordinates of the machine tools under the control of the CNC device. The precision of positioning of the CNC machine can be understood as the accuracy of the exercise of the machine tool. The machines or ordinary tools have manually entered and the positioning accuracy is mainly determined by the reading error, and the movement of the CNC machine is obtained by the instructions of the digital program.
CNC machine tools are the abbreviation of digital control machine tools and are automated machine tools equipped with program control systems. The control system can logically manage programs with control coding or other symbols, and use the coded number to indicate that Nanjing Fourth Tool Co., Ltd. Between the CNC device via an information operator. After processing the calculation, various control signals are issued by the CNC system to control the movement of the tool-tool.
The movement of each movement component of the machine tool is completed under the control of the CNC device. Precision is an important test.
1. The accuracy of positioning of the precision of positioning of the linear movement is generally carried out under the air load conditions of the machine tool and the workbench. According to national standards and international standardization organizations (ISO standards), CNC machine tools must be based on laser measurement. In the absence of laser interference meters, for general users, it can also be measured with a standard rule with optical reading microscope. However, the accuracy of the measurement instruments must be 1 to 2 levels higher than the measured precision. In order to reflect all multiple positioning errors, the ISO standard stipulates that each positioning point is calculated by the positioning point of the positioning point of each positioning point to calculate the average value and diffusion, and the composition of the band broadcast from the broadcast band.
2. Repeat the precision of positioning of the linear movement to detect the instrument used in the same as the detection positioning precision. The general detection method is to measure three locations with each coordinating route and the two ends. Reading number. With a half of the greatest difference in the three positions, positive and negative symbols are attached to the precision of repetitive positioning of the coordinate.
3. The origin of the point of origin of the linear movement returns the background point of the original point. repeated positioning precision.
4. The opposite error of the reverse error of the linear movement is also called loss of linear movement. Engine) of the coordinate axis in the dead area, complete reflection of errors such as the reverse gaps and the elastic deformation of each mechanical movement transmission.
The greater the error, the lower the precision of positioning and repetitive positioning. The method of detecting inverted errors consists in moving a distance to the positive or reversed movement in advance in the calendar of the measured coordinate axis and to stop the position as the reference. Stop position and reference position. Multiple determinations (generally 7 times) are carried out in the middle of the route and the three positions at both ends.
5. The Precision detection and measuring tool for positioning the turn table has a standard transfer, a corner polyhedron, a round light grid and a parallel light hose (permeable instrument), etc., and can be selected under specific conditions. The measurement method is to make the working angle a front (or inverted) angle and stop, lock it and position it. . The maximum value of the real corner and the theoretical value (instruction value) of each positioning position for a week is the punctual error error.
If it is a CNC for workbench, every 30 as a target position, and quickly position the position of each target position from two directions in the direction of twice. Deviation of the position. Given the real requirements of dry transformers, generally focusing on several right angles such as 0, 90, 180, 270, etc., and requires the accuracy of these points to increase a level of a level than other angles.
6. repeated precision test of the score of filming work
The measurement method consists in repeating the positioning of three positions 3 times in the week following the work of filming and in testing it under the rotation of the front and opposite directions. The maximum value accuracy of the theoretical value of all the reading values of the corresponding position. If it is a CNC workbench, take a measurement point every 30 as a target position, then quickly locate the positions of each target position from two directions. In the GB10931-89.
7. The origin of the origin of the origin of the workbench to detect the measurement method of 7 arbitrary locations to return to the point of origin to return to the position of the stop position.
It should be noted that the detection of existing positioning accuracy is measured in rapid plane and positioning. In addition, the results of the positioning accuracy are linked to the working state of the environmental temperature and to the working state of the coordinate axis. The element is mainly installed on the drive engine.。
This is the error caused by a thermal extension, and some machine tools use pre-divided methods (pre-tapes) to reduce the impact. The repetitive positioning accuracy of each coordinate shaft reflects the most basic precision indicator of the axis.
Currently, due to the growing function of the CNC system, the error of the sports accuracy system of each standard movement of the injector, such as the accumulation of the accumulation of height and the error reverse space, can be offset. cannot be compensated. Therefore, if the tool-tool is authorized, it is preferable to choose a machine tool with high positioning precision.
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