Internal stress measuring method of opening plate

Abstract

The invention provides an internal stress measuring method of an opening plate, belonging to the technical field of measurement. An opening plate is evenly cut into strips via marking benchmark straight lines on the opening plate for releasing the internal stress; the bending deformation of the benchmark straight line, corresponding to each measuring strip, is measured; the internal stress before releasing the stress is calculated according to the bending deformation of each measuring strip, so that the internal stress distribution of the whole opening plate is obtained. Advantageously, under the precondition of satisfying the internal stress measurement precision of the opening plate, sample preparation and measurement can be performed by common workers with conventional cutting tools, ordinary rulers and tapered rulers; and the internal stress of the opening plate is obtained fast by a mathematical model built by the invention. The method of the invention is used in the works of the process optimization of hot-rolling ship plates and opening process optimization of chip plates, and respectively used for measuring the internal stresses of D36 and D32 levels of ship plate opening plates which are 2000 mm in length and 2000 mm in width, so that the internal stress distribution of the ship plate opening plate is obtained accurately, and reliable reference data is provided for the optimization of production process.

Description

technical field [0001] The invention belongs to the technical field of detection and provides a method for measuring the internal stress of an open plate, which is a simple and efficient technique for measuring the internal stress of an open plate, and is low-cost, fast and effective. Background technique [0002] With the rapid development of my country's national economy, the prosperity of the shipbuilding industry and the machinery manufacturing industry have driven the production of hot-rolled sheets and strips. Hot-rolled sheets and coils need to be straightened and cut into flat plates before they can be put into use. At present, the open plate has been widely used in various manufacturing industries such as ship plates, high-strength machinery plates, and automotive steel. The internal stress of the flat plate is one of the important indicators for evaluating the quality of the flat plate, and it has a great impact on the safety of stamping, welding and final product ...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for measuring the internal stress of the open plate include the blind hole method, X-ray and neutron ray diffraction technology, ultrasonic technology and magnetoelastic technology, all of which are advanced internal stress detection technologies, but all have expensive equipment, slow measurement speed, and It is difficult to be widely used due to the shortcomings of high surface quality requirements and the need for specially trained operators.

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