Flattening Tooling and Flattening Test Method for Test Ring Unsteady State

Abstract

The invention discloses a flattening tool and a flattening test method for the instable state of a test ring, belongs to the field of flattening tests, and aims at correcting the distortion state of the test ring. The flattening tool comprises a base, a first baffle plate and a second baffle plate, wherein one end of the first baffle plate is mounted on the base; the other end of the first baffleplate is vertically upwards extended; one end of the second baffle plate is mounted on the base; the other end of the second baffle plate is vertically upwards extended; a through tank with an open upper end is formed by being surrounded by the first baffle plate, the second baffle plate and the base; a detachable side backing plate is arranged in the through tank; the side backing plate is attached to the inner side surface of the first baffle plate; a detachable lower backing plate is arranged in the through tank; the lower backing plate is attached to the inner side surface of the base. Byusing the flattening tool, the test ring is prevented from being taken from a product body for multiple times to carry out a test; the testing expense and time are saved, and the flattening test method utilizing the flattening tool is used for improving the one-time percent of pass of the test on the test ring.

Description

technical field [0001] The invention belongs to the field of large-scale pipeline flattening test, in particular to a flattening test method and a flattening tool for a test ring in an unstable state. Background technique [0002] The main pipeline of the third-generation PWR nuclear power plant adopts an integral forging structure, which has large size, complex structure and strict performance requirements. According to the requirements of relevant standards, the flattening test is divided into two steps. The first step is the ductility test. When the flattening test ring is pressed to the spacing H value by the upper and lower flat plates, the inner, outer or both ends of the test ring are checked. No cracks or ruptures occurred. The H value is calculated as follows: [0003] [0004] H: The distance between the upper and lower flat pressing plates at the end of the first step of compression (mm); t: The wall thickness of the pipe (mm); D: The specified outer diameter...

AI Technical Summary

Problems solved by technology

When repressing in the second step, if image 3 As shown, due to the enlargement of the test ring and the uneven deformation of each part, the test ring is easily twisted during pressing, the upper and lower planes of the test ring are not parallel, and the upper and lower planes are dislocated during pressurization to generate torque, and the test ring topples, which cannot be achieved. The inner surface of the test ring fits together, causing the test to be invalid

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