Method for ultrasonically detecting orientation degree of pipe on line

Abstract

The invention relates to a method for ultrasonically detecting the orientation degree of a pipe on line, which belongs to the field of the detection of the orientation degree. The method for detecting the orientation degree of the pipe on line during production is characterized by comprising the following steps of: preparing a plurality of samples with different orientation degrees from the same material, ultrasonically testing the sound velocities of directions, which are vertical to the orientation direction of the material, of the plurality of samples and accurately testing the orientation degrees of the plurality of samples by an infrared dichroism method; establishing a relation between an ultrasonic velocity of a direction which is vertical to the orientation direction and the orientation degree so as to obtain a corresponding working curve; and continuously testing the wave velocity of a pipe which is extruded during production on a pipe production line and testing the orientation degree of the pipe by using the working curve in real time. The defects of high requirement on the orientation degree of the sample, harsh requirement on sampling and offline sample measurement in the conventional test of the orientation degree are overcome. The method is convenient for realizing automatic and intellectualized online monitoring of the orientation degree, improves efficiency and can provide basis for product performance in time.

Description

technical field [0001] The method for detecting the degree of orientation of pipe material on-line by ultrasonic wave belongs to the detection field of degree of orientation. Background technique [0002] Oriented polyvinyl chloride PVC-O pipe is a pipe manufactured through a special orientation process. This process stretches the PVC-U pipe produced by the usual extrusion method in the axial and radial directions, so that the PVC in the pipe The long-chain molecules are regularly arranged in the biaxial direction to obtain a new type of PVC pipe with high strength, high toughness, high impact resistance and fatigue resistance, and its performance is far superior to that of ordinary PVC-U. The research and development of PVC-O pipes can greatly save raw material resources, reduce costs, improve product performance, and have obvious economic and social benefits. However, the determination of the orientation degree of PVC-O pipes, especially the online orientation determinati...

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Problems solved by technology

[0004] XRD and infrared dichroism are relatively mature and widely used test methods, but they are generally sampled and difficult to prepare and do not have the advantage of being used as an online detection of orientation

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