Method for grabbing specified part of shaft workpiece for feeding

Abstract

The invention discloses a method for grabbing a specified part of a shaft workpiece for feeding. The method comprises the following steps of identifying rectangular stickers with specific colors at four corners of a material box to obtain three-dimensional coordinates of the center of the material box and an area where the shaft workpiece is located; selecting a workpiece contour from the area for rough drawing, and obtaining the mass center and the axis of the workpiece according to the outer edge of a rough contour; rotating a left image shot by a camera to enable the axis of the workpiece in the left image to be horizontal, obtaining the minimum enclosing rectangle of the workpiece at the moment, and establishing a relation between the minimum enclosing rectangle and a pre-stored template image, so as to obtain three-dimensional coordinates of corresponding points of the workpiece in the left image according to a to-be-clamped point and a chuck clamping point marked in the template image; and clamping the to-be-clamped point of the workpiece by an end effector on a mechanical arm, sending the workpiece to a machine tool chuck, and clamping the workpiece at the chuck clamping point. The method can specify a clamping part, and is suitable for various shaft workpieces, and high in practicability.

Description

technical field [0001] The invention relates to an automatic feeding method, in particular to a method of using machine vision for positioning and using a six-degree-of-freedom series mechanical arm to grab shaft parts for feeding. Background technique [0002] In the field of automatic loading and unloading, it is often necessary to design complex mechanisms to ensure the trajectory and precise position of the movement. These devices are often only suitable for a small class or several similar workpieces, lacking versatility. On the other hand, with the development of multi-degree-of-freedom manipulators, the positioning accuracy and repeatability of the manipulators have been greatly improved. Cameras are often used as sensors when calculating the position of workpieces. Through a suitable algorithm, the camera can obtain the pose of the workpiece, and the accuracy can meet the needs of most loading and unloading. [0003] Shaft parts are a large category of workpieces ...

AI Technical Summary

Problems solved by technology

In fact, due to the tilt of the light source, there are black shadows or reflections on the edge of the axis outline, which will cause the axis angle obtained by this method to be inaccurate

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