What are the Factors that lead to decline of positioning accuracy of linear module when they are used for a period of time?
Linear module is a precision component, and the repeated positioning accuracy is one of the important performance indicators of the module. Sometimes users find that the accuracy decreases or is not so accurate after using it for a period of time. What are the reasons for our reference?
1.Brand and quality of core components of the module.
The components affecting the accuracy of the module include ball screw, linear guide rail, bearing, synchronous belt and synchronous wheel. The error caused by the clearance of the worn ball screw affects the accuracy of the module, so the quality and brand selection of the screw are very important. In the domestic market, due to price competition and other factors, many manufacturers will use the screw with poor quality and serious wear soon.
Secondly, the high rigidity and high quality linear guide rail can better support and guide the sliding block and other components to make stable linear motion, so the guide rail is also a factor of high stability accuracy. Tallman Robotics adopts high-quality brand bearings such as Japanese original NSK and renben, while some manufacturers may adopt bearings with axial clearance problems in order to save costs, which will also lead to inaccurate accuracy. Like the ball screw, the quality of the synchronous pulley and synchronous belt as the transmission part is also an important factor affecting the accuracy. The inferior belt will deform or become loose after being used for a period of time, resulting in clearance in the transmission process, and the accuracy will decline.
2.Quality of supporting servo motor.
For the module slide project with high precision requirements, the supporting motor type is the servo motor with high precision control. However, if there is a problem with the encoder of the servo motor, the number of pulses sent will be inconsistent with the walking position of the module.
3.Check whether the input value of lead is correct. Secondly, check whether the input travel value deviates.
4.Recheck and calibrate the parallelism of the mounting bottom surface of the module.
If there is a problem with the flatness of the bottom surface of the module installation, it will lead to strong bending deformation of the important structure of the module, including the bottom surface, guide rail and screw rod, affect the smoothness, accuracy and service life of the module, and even damage the module.
5.The position of the timing belt is not calibrated well or the tightness of the timing belt is inappropriate
For the module slide driven by the synchronous belt or the module with the motor installed on one side, pay attention to the deviation or wear and cracking of the synchronous belt due to the uneven synchronous wheel. The tension of the synchronous belt should be adjusted moderately. If the tension is too tight, there will be abnormal noise during operation. If it is too loose, there will be clearance, affect the accuracy or skip teeth.
6.Check and confirm whether there are improper operations affecting the working efficiency and service life of the module, such as long-term overload operation, excessive cantilever length and failure to reduce the speed according to the share during long-distance operation.
When installing and using the module, it is forbidden to knock, collide, forcibly lock and other behaviors, resulting in loose nuts or deformation of screw rods and other parts, which will affect the accuracy. Pay attention to prevent dust particles and other pollutants in the working environment from invading the interior of the module, and regularly carry out inspection, cleaning, lubrication and other maintenance work.
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