Research On Deep Hole Straightness Detection And Evaluation

It is difficult to dissipate heat and evacuate chips during deep-hole machining.It is difficult to observe tools and workpieces during processing,and it is easy to produce quality problems such as excessive straightness of deep holes.For deep hole inspection,qualitative analysis is carried out using testing tools such as plug gauges.In a few cases,after using special equipment to collect data,the straightness error of deep hole is evaluated by the method of connecting the two ends and the least square method.It is of theoretical and practical value to study the detection and evaluation of deep hole straightness errors.In this paper,the structural design of the spatial straightness detection device is based on the principle of straightness detection.The mechanical modeling and analysis of the elastic device was conducted to verify the feasibility of the device.Identify and solve some problems in the design,and optimize the adjustment of the detection device.During the detection process,the elastic device moves in the hole,and the photosensitive sensor continuously outputs the received laser spot position to the computer via wireless Bluetooth;after the detection,the computer is used for data processing to draw the actual axis of the deep hole measured.A spatial straightness error analysis algorithm based on rotational inertia algorithm is proposed.The algorithm finds the projection direction by solving the main axis of inertia,projects the discrete points that make up the actual axis into a plane perpendicular to the main axis of inertia,and converts the spatial straightness evaluation into the minimum circle coverage problem of the set of discrete points in the plane.Use this algorithm to evaluate the straightness error of the axis and verify the advantages and disadvantages of this algorithm.A spatial straightness error analysis algorithm based on the two centroid connection method is proposed.The algorithm solves the position of the segmented centroid,connects the two centroids as the projection direction,projects the discrete points that make up the actual axis into the plane along the direction of the projection line,and converts the spatial straightness evaluation into the minimum circle coverage problem of the set of discrete points in the plane.Use this algorithm to evaluate the straightness error of the axis and verify the advantages and disadvantages of this algorithm.The straightness detection device proposed in this paper has a simple structure and a convenient detection process,which can be used for straightness detection of small diameter deep holes.The straightness error evaluation method proposed in this paper has a simple calculation process,a novel algorithm,and improved accuracy.Exploration and innovation of degree error evaluation methods.