Now a lot of machinery manufacturers, injection molding machine manipulator used in choosing as the main mode of production, but the use of automation in production manipulator can raise the production efficiency and product quality as well as in reducing the production cost of products greatly improved, in the production of injection molding machine manipulator can work accurately, is actually a three dimensional space location problem, is the combination of several line measure and Angle positioning. In a number of relatively simple cases, a single value is likely to be important. Affecting a single dose or angular position error factors are as follows:
1. Positioning way, different way of positioning different influence factors. Such as mechanical stop positioning, positioning accuracy and stiffness of the block and collision block is the speed and other factors.
2. Positioning speed, positioning a great influence on positioning accuracy. This is because the positioning speed is not at the same time, the parts of energy dissipation motion must be different. Usually, to reduce the positioning error should set a reasonable control speed, such as improving the efficiency of buffer performance and buffer buffer device, control drive system makes the moving parts timely slowdown.
3. Precision, manufacturing and installation accuracy of the manipulator control accuracy has a direct impact on the positioning accuracy.
4. Stiffness, structure stiffness and contact stiffness of the manipulator are low, because of easy generation vibration, positioning precision is generally low.
5. The weight of the moving parts, moving parts including the weight of the manipulator itself and the weight of the weight of grip. Affected by the changes on the positioning accuracy of moving part weight. Usually, the moving parts weight increases, the positioning accuracy is lower. Therefore, the design is not only to reduce the weight of the moving parts itself, and when considering which jobs to grasp the influence of weight change.
6. Drive source, hydraulic, pneumatic pressure fluctuations and the voltage, oil temperature, the temperature will affect the repositioning precision of the manipulator. Therefore, adopt necessary measures of voltage stability and control the oil temperature. Such as oil pressure accumulator is stable with a heater or cooler to control the oil temperature, low speed, temperature, pressure compensated flow control valve control.
7. Control system, switch control and electrohydraulic proportional control and position control accuracy of servo control is not the same. This not only because of a variety of control components of precision and sensitivity, but also related to the position feedback device with and without.
