Many machinery and equipment manufacturers now choose to use injection molding robot arms as their main production method. The use of automated robot arms in production can improve efficiency and quality of products, and reduce production costs. However, whether the injection molding robot arm can work accurately in production, it is actually a three-dimensional positioning problem. It is a combination of several line and angular positioning. Only by reducing the errors of these combinations can the injection manipulator operate normally. Then, what are the factors affecting the positioning error of a single line or angular?
Positioning methods and speeds
Different positioning methods have different effects. For example, when the mechanical dog plate is positioned, the positioning accuracy is related to the rigidity of the dog plate and the speed when the dog plate is touched. The positioning speed has a great influence on the positioning accuracy, because when the positioning speed is different, the energy consumed by the moving parts is different. Generally, we should reasonably control the positioning speed in order to reduce the positioning error, such as improving buffering performance and efficiency of the buffering device and controlling the driving system to make the moving parts decelerate in good time.
Accuracy and rigidity
The manufacturing accuracy and installation speed regulation accuracy of the manipulator have a direct impact on the positioning accuracy. When the structural and contact rigidity of the manipulator itself are low, the positioning accuracy is generally low due to vibrations. The position control accuracy of switch control, electro-hydraulic proportional control and servo control is different. Not only are the accuracy and sensitivity of various control elements different, but also it is related to the position feedback device.
Weights and driving sources of moving parts
The weights of the moving parts include weights of the manipulator itself and object being grabbed. Changes in the weight of moving parts have a greater impact on positioning accuracy. Generally, when the weight of the moving parts increases, the positioning accuracy decreases. Therefore, not only should the weight of the moving parts themselves be reduced in the process of design, but also the influence of changes in the grasping weight during work should be considered. The pressure fluctuation of hydraulic and air pressure, the fluctuation of voltage, oil temperature and air temperature will affect the repeat positioning accuracy of the manipulator. Therefore, necessary measures of voltage stabilization and oil temperature adjustment are adopted, such as the use of accumulators to stabilize oil pressure, heaters or coolers to control oil temperature, and use control valves to control temperature and pressure compensation flow at low speeds.
Jingbei Technology (Zhejiang) Co., Ltd.