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Many CNC cutting machine manufacturers will refer to the concept of accuracy when recommending products to users. For example, the accuracy of our CNC cutting machine can be much better than other brands. But in fact, such a statement itself is inaccurate, Dongguan Zhen Lei Lei mechanical and electrical engaged in CNC cutting machine research and development for many years, in a number of cutting tests to prove that the flame cutting and plasma cutting as the main CNC cutting machine equipment, its own accuracy exists With the upper limit of the equipment, in other words, this has nothing to do with the brand. Take the SF series of CNC cutting machines of Zhenlei-Lei Electromechanical as an example, the cutting accuracy is within ±0.5MM, but we do not think that other brands CNC cutting machine can not reach this range of precision, the difference between product quality lies in the stability of the use of equipment.
One of the bigger mistakes in similar marketing arguments is that no industry standard has been given, just like the ±0.5MM accuracy error we discussed earlier, for users who are first exposed to CNC cutting machine equipment. What does one error range mean in the end? Is it in the finishing industry or in the primary processing level?
In fact, similar problems have also appeared on some related materials. For example, there was a CNC cutting machine promotion article that reported that the “positioning accuracy†of a CNC cutting machine tool A was marked as 0.04 mm, while in another manufacturer’s sample On the other hand, the "positioning accuracy" of similar CNC cutting machine B is marked as 0.06mm. From these data, you will naturally think that machine A is more accurate than machine B. However, it is actually possible that the accuracy of CNC cutting machine B is higher than that of CNC cutting machine A. The problem is how the accuracy of machine tools A and B is defined, respectively.
It is often confusing that the same indicator names represent different meanings in different accuracy criteria, and different indicator names have the same meaning. In addition to the JIS standards, many of the standards implemented by the industry are calculated through mathematical statistics after multiple rounds of measurements on multi-target points on the numerical control axis of CNC cutting machines. The key differences are:
(1) The number of target points;
(2) measuring the number of rounds;
(3) It is particularly important to approach targets from one direction or two directions;
(4) The calculation method of the accuracy index and other indexes.
This is a description of the key differences between the four standards. As one would expect, one day, all CNC cutting machine manufacturers will follow the ISO standard. Therefore, the ISO standard is selected as a benchmark here. The four types of standards are compared in the attached table. This article only deals with linear accuracy because the calculation principle of rotation accuracy is basically the same.
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