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Dynamic indexing accuracy requirements of cam indexer

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Update time : 2020-02-03 17:50:28
  Dynamic indexing accuracy refers to the indexing accuracy measured in the motion state of the cam indexing mechanism or the output shaft under load. For example, under conditions of processing, assembling, and inspecting automatic machinery such as packaging machines, food machinery, and assembly machinery, the input shaft is measured in a rotating motion. If the static indexing accuracy is very high, the dynamic indexing accuracy is poor, and the normal movement cannot be performed.
Requirements of cam indexer
The factors that have the greatest impact on the dynamic indexing accuracy of the indexing device are the static indexing accuracy and the residual vibration during the stay, especially the amount of residual vibration. This deviation in the amount of vibration is the dynamic indexing accuracy.
Residual vibration is closely related to actual acceleration. The waveform of residual vibration and actual acceleration is of great significance to the accuracy of dynamic indexing. Dynamic indexing accuracy is the indexing accuracy of the entire system including input and output.
1. Residual vibration. Residual vibration is closely related to load torque, rigidity, and cam curve, and is particularly greatly affected by the gap of input and output drive systems, insufficient rigidity, and increased torque pulsations. This pulsating torque increase is more than three times the design value. It can be said that the dynamic indexing accuracy or residual vibration is seriously affected by the input-output drive system.
In actual operation, the attenuation of residual vibration is very important. Instead of starting to work with the indexing accuracy just after entering the cam stop section, the residual vibration must be within the allowable range at the beginning of the work.
2. Measurement method. Laser side positioner is generally used to measure the amount of vibration. This type of laser lateral device is relatively popular and easy to operate. The reflector is attached to the measuring block on the workbench, and the sensor head is installed facing the reflector. Because the measurement block has a certain inclination angle, the measured vibration amount is slightly different from the actual vibration amount. The actual vibration amount must be determined after considering the installation angle of the measurement block installation.
If a measuring block is installed at each station, the residual vibration amount of all stations can be measured at one time.
In summary, the biggest factor affecting the accuracy of dynamic indexing is residual vibration. Different installation methods of the input and output drive systems of the indexing device have different effects on the residual vibration. For this reason, the rigidity of the input-output drive system must be increased to improve its dynamic indexing accuracy.