In recent years, various CMM software developers have added CAD functions to their own software, and their functions are getting stronger and stronger. This article briefly describes the use of CAD in the coordinate measuring software and its function.
Foreword
As a high-precision universal measuring device, the coordinate measuring machine has been developed for decades, and its use in industrial production is more and more extensive, and it is increasingly valued by production companies. The introduction of CAD function in the three-coordinate measuring software pushes the application field and ease of use of the CMM to a new height.
The following takes the measurement plan of the coordinate measuring machine of Xi'an Lide Measuring Equipment Co., Ltd. as an example to briefly introduce the application of CAD in the coordinate measurement.
1, virtual measurement
Virtual measurement is the measurement of CAD models in software without actual artifacts.
The measurement software of Xi'an Lide Measuring Equipment Co., Ltd. has powerful CAD functions. When making virtual measurements, open the software, select the offline working mode, then import the CAD model to be measured, and map the CAD model to the selected coordinate system. The measurement is performed in the middle. According to the geometric elements to be measured, use the mouse to click on the position of the desired point on the CAD model. At this time, the position of the selected point and its vector direction will be displayed on the CAD model. Multiple points can be taken based on the needs of the measured geometrical elements. When the required number of points is taken and then determined in the picking point window, the system will drive the virtual probe to take the point and plan out the geometric elements and their graphs to be measured.
Virtual measurements can be determined by measuring CAD dimensions of CAD models without dimensional data. But this is not the main purpose of virtual measurement. The main function of virtual measurement is to serve the automatic measurement programming in the offline state.
2, offline programming
The numerical control coordinate measuring machine improves the efficiency of batch measurement. By programming the measurement of a given workpiece, it can realize fully automatic rapid measurement.
Before the three-coordinate measurement software introduces the CAD function, the preparation of the measurement program requires the professional to program the corresponding drawings. This programming method is more complicated to use and requires higher requirements for the operator.
Another method is to use the self-learning programming function of the coordinate measuring software to automatically generate the measurement program while actually measuring the workpiece. This program can be called for automatic measurement when the same workpiece is measured again. Because this method is simple and easy to use, it is widely used in the industry. However, since this kind of programming is inseparable from the actual workpiece, it brings many disadvantages that are difficult to overcome. First, because the programming is inseparable from the hardware environment, it is necessary to open the air supply to the measuring machine, so that the measuring machine can run normally before programming, which is more complicated. Second, programming is inseparable from the workpiece, so it is necessary to wait for the workpiece to be processed before programming, which will reduce the work efficiency and affect production.
After the CAD function is introduced in the coordinate machine measurement software, the above problem can be solved because the CAD model can be virtually measured in an offline state, thereby completing the self-learning programming process. No matter whether the production is carried out or not, the CAD drawing file designed by the design department can be programmed into the measurement software. The program measurement can be performed when the workpiece is processed, which greatly improves the production efficiency. The specific method is to first open the CAD model of the workpiece to be measured in the coordinate measuring software, and then open the self-learning function of the measuring program. After the coordinate system is established, the measurement of the workpiece can be started. The measurement program is automatically generated by the system.
After the programming is completed, you can also call the program in the CAD environment to perform analog measurement, verify the program, find out the error measurement path and mining point that occurred during the operation, and correct the program, which may appear in the actual measurement. The problem is minimized and the safety during the measurement process is guaranteed to the greatest extent.
3. Make location tolerance assessment more convenient
In the previous three-coordinate measuring software, in order to evaluate the positional tolerance of geometric elements, the theoretical position of the geometric elements must be manually input, and then compared with the actual measured values, so that the evaluation of the position tolerance is inconvenient.
When the coordinate measuring machine software introduces the CAD function, the CAD model can be measured in the software. Since the model is designed, the measured value is the theoretical value of the geometric element. After the theoretical value is obtained, the actual workpiece is measured in the corresponding coordinate system, and the actual value of the desired geometric element is obtained. This allows the positional tolerances of the measured geometric elements to be evaluated.
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.
Foreword
As a high-precision universal measuring device, the coordinate measuring machine has been developed for decades, and its use in industrial production is more and more extensive, and it is increasingly valued by production companies. The introduction of CAD function in the three-coordinate measuring software pushes the application field and ease of use of the CMM to a new height.
The following takes the measurement plan of the coordinate measuring machine of Xi'an Lide Measuring Equipment Co., Ltd. as an example to briefly introduce the application of CAD in the coordinate measurement.
1, virtual measurement
Virtual measurement is the measurement of CAD models in software without actual artifacts.
The measurement software of Xi'an Lide Measuring Equipment Co., Ltd. has powerful CAD functions. When making virtual measurements, open the software, select the offline working mode, then import the CAD model to be measured, and map the CAD model to the selected coordinate system. The measurement is performed in the middle. According to the geometric elements to be measured, use the mouse to click on the position of the desired point on the CAD model. At this time, the position of the selected point and its vector direction will be displayed on the CAD model. Multiple points can be taken based on the needs of the measured geometrical elements. When the required number of points is taken and then determined in the picking point window, the system will drive the virtual probe to take the point and plan out the geometric elements and their graphs to be measured.
Virtual measurements can be determined by measuring CAD dimensions of CAD models without dimensional data. But this is not the main purpose of virtual measurement. The main function of virtual measurement is to serve the automatic measurement programming in the offline state.
2, offline programming
The numerical control coordinate measuring machine improves the efficiency of batch measurement. By programming the measurement of a given workpiece, it can realize fully automatic rapid measurement.
Before the three-coordinate measurement software introduces the CAD function, the preparation of the measurement program requires the professional to program the corresponding drawings. This programming method is more complicated to use and requires higher requirements for the operator.
Another method is to use the self-learning programming function of the coordinate measuring software to automatically generate the measurement program while actually measuring the workpiece. This program can be called for automatic measurement when the same workpiece is measured again. Because this method is simple and easy to use, it is widely used in the industry. However, since this kind of programming is inseparable from the actual workpiece, it brings many disadvantages that are difficult to overcome. First, because the programming is inseparable from the hardware environment, it is necessary to open the air supply to the measuring machine, so that the measuring machine can run normally before programming, which is more complicated. Second, programming is inseparable from the workpiece, so it is necessary to wait for the workpiece to be processed before programming, which will reduce the work efficiency and affect production.
After the CAD function is introduced in the coordinate machine measurement software, the above problem can be solved because the CAD model can be virtually measured in an offline state, thereby completing the self-learning programming process. No matter whether the production is carried out or not, the CAD drawing file designed by the design department can be programmed into the measurement software. The program measurement can be performed when the workpiece is processed, which greatly improves the production efficiency. The specific method is to first open the CAD model of the workpiece to be measured in the coordinate measuring software, and then open the self-learning function of the measuring program. After the coordinate system is established, the measurement of the workpiece can be started. The measurement program is automatically generated by the system.
After the programming is completed, you can also call the program in the CAD environment to perform analog measurement, verify the program, find out the error measurement path and mining point that occurred during the operation, and correct the program, which may appear in the actual measurement. The problem is minimized and the safety during the measurement process is guaranteed to the greatest extent.
3. Make location tolerance assessment more convenient
In the previous three-coordinate measuring software, in order to evaluate the positional tolerance of geometric elements, the theoretical position of the geometric elements must be manually input, and then compared with the actual measured values, so that the evaluation of the position tolerance is inconvenient.
When the coordinate measuring machine software introduces the CAD function, the CAD model can be measured in the software. Since the model is designed, the measured value is the theoretical value of the geometric element. After the theoretical value is obtained, the actual workpiece is measured in the corresponding coordinate system, and the actual value of the desired geometric element is obtained. This allows the positional tolerances of the measured geometric elements to be evaluated.
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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