Die Positioning And Measurement Path Planning And Design Based On Binocular Vision

In the mold manufacturing industry,due to the diversity,complexity and small batch of molds,rapid positioning and measurement of molds during processing has become a problem.The existing measurement technology uses a human-operated three-coordinate measuring machine for positioning.The speed of this positioning method depends on the proficiency of the operator.At the same time,it requires manual work for a long time.A little carelessness in the measurement process will cause the subsequent processing of the workpiece.failure.This has become one of the main problems that limit mold production efficiency in the mold processing industry.In the mold processing process,the positioning accuracy is required to be ±0.001 mm,and the vision is difficult to meet the needs.Based on the needs of the mold manufacturing industry,this paper designs a binocular vision workpiece position precision detection positioning and path planning system,which can locate the mold online.At the same time plan the measurement path of the three-coordinate measuring machine to realize fast and accurate automatic positioning measurement.Firstly,this paper uses binocular vision and CMM to build a set of mold positioning and measurement path planning system applied in the process of mold insert processing,to achieve high-precision measurement path planning.Then,this paper proposes a phase unwrapping method combining dual-frequency heterodyne and dual complementary phase encoding.This method uses two sets of sinusoidal fringes to obtain two wrapped phases,performs heterodyne processing to obtain the heterodyne phase,uses the heterodyne phase to expand the high-frequency phase for the first time,and then uses the complementary encoding phase shifted by half a step to obtain the fringe order.For the first unfolding phase,select different phase encoding levels for phase unfolding according to different regions.The cycle of dual-frequency heterodyne synthesis does not need to cover the entire field of view,which breaks the limitation of frequency selection by the traditional dual-frequency heterodyne method and the three-frequency heterodyne method,and can be used for high-precision measurement with higher frequency fringes.It overcomes the limitation of phase main value error for high-precision measurement using higher frequency fringes,improves the measurement of reflective objects,avoids the jump error caused by phase jump,and provides accurate data for mold positioning.At the same time,this paper uses a blue light projector as a light source in combination with the actual situation of an industrial site,and uses a filter to remove interference,which improves the robustness of the system and improves the measurement accuracy of reflective objects.Finally,by analyzing the positioning and detection requirements in the process of mold insert processing,this paper extracts information from the three-dimensional data obtained by vision,recognizes three-dimensional lines,points,surfaces,and circles,and calculates key point information and point feed direction.route plan.Industrial field experiments show that the binocular vision workpiece position precision detection positioning and path planning system has a calibration accuracy of0.02 mm for a600mm×500mm scene,a binocular positioning error of 0.08 mm,and a collection time of less than 2s,which meets industrial needs.The content studied in this paper can be applied to the fields of 3D reconstruction,visual 3D positioning and 3D defect detection in industry.