CNC machining centres play a vital role in modern manufacturing, as CNC machining centres are able to machine a wide range of components with high accuracy and efficiency, and therefore their positioning accuracy inspection methods are particularly important. This article will introduce positioning accuracy inspection methods for CNC machining centres, with a focus on repeat indexing accuracy inspection and home return accuracy inspection of rotary tables.
In CNC machining centres, accuracy has a significant impact on the quality and efficiency of the finished product. Therefore, in order to improve machining accuracy, machines need to be adjusted to standard accuracy levels, with particular attention to the accuracy of spindles, sockets and beds. Real-time monitoring of the machining process helps to identify deficiencies and make adjustments. Attention also needs to be paid to whether electronic pulse errors are affecting the lead of the ball screw and whether the accuracy of each drive mechanism meets factory requirements. Minimising deviations in CNC programming can further reduce errors and ensure optimum performance. The machines are also equipped with safety features such as fully enclosed construction and stainless steel guards to prevent chip spillage, which is easily cleaned up by chip collectors or conveyors.
Returning to the positioning accuracy check method, the rotary table is one of the most common components in a CNC machining centre, so it is vital that it is checked for accuracy. To check the repeatability of the rotary table, three positions are selected and each position is repeated three times, once in both directions. The difference between the reading with the largest difference and the theoretical value at the corresponding position is the indexing accuracy. In the case of CNC rotary tables, five quick positions are selected for every 30 measuring points, and the difference between the actual position reached and the target position, i.e. the position deviation, is measured from both the forward and reverse directions respectively. The standard deviation is then calculated according to GB10931-89 and 6 times the maximum value of the standard deviation for each measurement point is used as the repeat indexing accuracy of the CNC rotary table.
It is also important to check the home return accuracy of the rotary table. This test involves performing a home return at any 7 positions and measuring the stop position. The maximum difference in reading is taken as the home return accuracy. It should be noted that existing positioning accuracy checks are carried out in a fast, positioning situation.
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Post time: Mar-15-2023