In use, this eliminates the hassle of manually inputting the theoretical values ​​of the geometric elements one by one, and also avoids frequently changing the coordinate system in order to correspond to the dimension on the drawing. This greatly reduces the labor intensity of the operator, reduces the chance of error, and also improves the accuracy and efficiency of the measurement.
4, CAD output for reverse engineering
In the current manufacturing process, there is often such a situation that the customer can provide the manufacturer with only the physical object without any drawings or CAD data, especially the curves, curved surfaces, etc. in the sample are difficult to obtain accurate by measurement. A complex model of data. In this case, the conventional processing method is to make a one-to-one mold by engraving or other methods, and then use the mold to produce. This method does not allow accurate dimensional drawings of the workpiece, and it is difficult to modify its appearance.
Reverse engineering is a set of theories proposed to solve the above problems. Reverse engineering refers to the process of producing drawings or various related dimensional data from workpieces, which is relative to the traditional process of producing workpieces from drawing data. The introduction of CAD function in the coordinate measuring software for reverse engineering has enabled the traditional CMM to be used for the inspection of finished products with a greater expansion.
In reverse engineering, the prototype is first accurately measured using a coordinate measuring machine, and then the measured data is processed by the CAD function to finally generate one or several data files in CAD format. For example, Xi'an Lide's coordinate measuring software generates data in IGS format, and can also use the functions provided by this software to convert data between multiple CAD formats.
These data files can be accepted by the general CAD/CAM software system. These software systems can be used to modify the data, or directly to the CNC machine tool processing method, and finally guide the CNC machine tool for processing. These data can also be sliced ​​to guide the laser forming machine for rapid prototyping.
Reverse engineering not only enables the workpiece to enter the mass production quickly, but also obtains the CAD data of the workpiece. With these data, the workpiece can be tested using the coordinate measuring machine to ensure the quality of the product.
Conclusion
As a general-purpose measuring machine, the coordinate measuring machine has an irreplaceable position in modern industry because of its high measurement accuracy and measurement efficiency, and its convenient operation and on-line measurement. The introduction of CAD functions will definitely bring more space for the CMM.
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