How to choose CMM correctly

2022-08-19
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How to choose CMM correctly

choose www.mechnet com. cn "> CMM method:

CMM is one of the most effective methods to measure and obtain dimensional data, because it can replace a variety of surface measurement tools and expensive combination gauges, and reduce the time required for complex measurement tasks from hours to minutes. The function of CMM is to quickly and accurately evaluate dimensional data and provide operators with useful information about the status of the production process, which is different from all manual Measuring equipment is very different

next, we will introduce how to choose a CMM: the CMM contacts the workpiece for measurement through a sensor called a probe, and the data obtained can be combined with the size description of the workpiece or a workpiece feature (such as a hole). Through these dimensional descriptions, it is easier to determine whether the workpiece or feature is out of tolerance. This information also provides clues for correcting the abnormalities in the production process that cause out of tolerance

1. Make CMM suitable for your application: if a CMM is exactly what you need for your work, how to choose the best one? The first thing to decide is which model of CMM to buy. According to the position of the probe on the measuring machine, there are three basic types: vertical, horizontal and portable

2. Install the probe on the vertical arm of the vertical CMM. The accuracy of this kind of measuring machine is higher than that of horizontal measuring machine, because the bridge structure is more stable and there are fewer moving parts, which makes them have better rigidity and stability. The vertical coordinate measuring machine includes various sizes, which can measure the pinion, engine box, and even the fuselage of commercial aircraft with a certain proportion

3. The horizontal measuring machine installs the measuring head on the horizontal shaft. They are generally used to detect large workpieces, such as car bodies, with a medium level of accuracy

4. Portable measuring machine simplifies the measurement of workpieces and assemblies that cannot be moved to the measuring machine. Portable measurement can be installed on or even inside the workpieces or assemblies, which allows the measurement of internal space and allows users to measure at the assembly site, thus saving the time of moving, transporting and measuring a single workpiece

5. In order to avoid the influence of the displacement of the measuring machine fulcrum due to too high cost and keep it stable, in the design process, the quality and rigidity are generally increased by improving the cross-section of structural components, increasing the distance of air bearings, improving the driving force of the motor, and optimizing the selection of structural materials based on weight and temperature performance, so as to improve the measurement accuracy, repeatability, measurement speed and acceleration. These principles are also applied to some horizontal workshop CMM. This system monitors the production status of the order in Nanjing steel through the mobile terminal; The order received is combined with the high accuracy of vertical design

6. The direction of horizontal measurement makes the collocation of measuring machine and horizontal machine tool processing equipment more reasonable. They are especially suitable for measuring large gearboxes and engine housings that require high-precision measurement

7. The addition of turntable makes four axes possible, and the configuration of two arms can also be realized, which can measure all directions of the workpiece. The horizontal arm configuration is relatively easy to load and unload the workpiece. The small, workshop type horizontal arm measuring machine is used in the high-speed production process

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