How to reduce the production error of injection molding machine manipulator?

Now many machinery manufacturers are choosing to use injection molding machine manipulators as the main production mode, but the use of automatic manipulators in production can improve the production efficiency and product quality and reduce the production cost of products are greatly improved, in the production of injection molding machine manipulators can work accurately, in fact, is a three-dimensional space positioning problem. It is a combination of several linear and angular positions. In many simpler cases, a single magnitude value may be dominant. The factors that affect the positioning error of a single line or Angle are as follows:

1. Positioning mode

Different positioning methods have different influencing factors. For example, when the mechanical block is positioned, the positioning accuracy is related to the stiffness of the block and the speed when touching the block.

2. Positioning speed

Positioning speed has great influence on positioning accuracy. This is because the energy of the moving parts that must be dissipated is different at different positioning speeds. Generally, in order to reduce the positioning error, the positioning speed should be reasonably controlled, such as improving the buffer performance and buffer efficiency of the buffer device, and controlling the drive system to slow down the moving parts in time.

3. precision

The manufacturing accuracy and installation speed adjustment accuracy of the manipulator have a direct influence on the positioning accuracy.

4. stiffness

When the structural stiffness and contact stiffness of the manipulator itself are low, the positioning accuracy is generally low because of easy vibration.

5. The weight of the moving part

The weight of the moving part includes the weight of the manipulator itself and the weight of the object to be grasped. The change of the weight of moving parts has great influence on the positioning accuracy. Generally, when the weight of moving parts increases, the positioning accuracy decreases. Therefore, when designing, it is not only necessary to reduce the weight of the moving parts themselves, but also to consider the impact of the change of grip weight during work.

6. Driving source

The pressure fluctuation of hydraulic pressure and air pressure and the fluctuation of voltage, oil temperature and air temperature will affect the repeated positioning accuracy of the manipulator. Therefore, the necessary pressure regulation and oil temperature regulation measures are adopted. If the accumulator is used to stabilize the oil pressure, the heater or cooler is used to control the oil temperature, and the temperature and pressure compensation flow control valve is used at low speed.

Seven. Control system

The position control accuracy of switch control, electro-hydraulic proportional control and servo control is different. This is not only due to the different precision and sensitivity of various control elements, but also related to the presence or absence of position feedback devices.