When screwing complex-shaped workpieces, the Four-axis robot locking screw machine needs to adopt a variety of advanced technologies and strategies to ensure the accuracy of positioning.
First of all, the visual positioning system is one of the key factors. This system is usually equipped with a high-resolution camera that can accurately capture images of complex-shaped workpieces. The camera can shoot the workpiece from multiple angles to obtain the three-dimensional shape information of the workpiece. With the support of image processing algorithms, the system can identify the pre-set screw hole features on the workpiece, such as the shape of the hole, the edge contour, and the relative position with the surrounding features. By comparing with the pre-stored standard workpiece model, the exact coordinates of the screw hole are calculated. For example, for workpieces with irregular surfaces and multiple raised or recessed structures, the visual system can accurately determine the position of the hole based on the texture changes around the hole, thereby providing accurate positioning information for the four-axis manipulator.
Secondly, the motion control algorithm of the four-axis manipulator itself is also crucial. It uses advanced motion planning algorithms to accurately plan the motion trajectory of each axis based on the target position information provided by the visual system. When facing workpieces with complex shapes, this algorithm can take into account factors such as the curvature and inclination of the workpiece surface and adjust the robot's posture and motion path. For example, when the screw hole is located on an inclined plane, the robot's algorithm can calculate the angle and distance that each axis needs to rotate and move to ensure that the screwdriver head can be vertically aligned with the screw hole to avoid inaccurate positioning due to angle deviation.
Furthermore, the sensors on the robot also play an important role. For example, the contact sensor can detect slight changes in contact force when approaching the screw hole. When the screwdriver head approaches the screw hole, once the sensor detects a slight contact with the edge of the hole, it will feedback a signal to the control system, and the control system will fine-tune the position of the robot according to the signal to further improve the positioning accuracy.
In addition, calibration and compensation mechanisms are also indispensable. Before actual operation, the Four-axis robot locking screw machine needs to be accurately calibrated to ensure that the zero position of each axis is accurate. And during the working process, the system will make real-time compensation according to the actual positioning error. For example, if there is a deviation in positioning due to slight deformation of the workpiece material or thermal expansion and contraction of the equipment, the compensation mechanism can adjust the movement of the robot in time to ensure that the screw can be accurately locked in the predetermined position. Through these comprehensive methods, the Four-axis robot locking screw machine can also achieve high-precision screw locking positioning on complex-shaped workpieces.
