PROBLEM TO BE SOLVED: To provide a residual stress evaluation method capable of nondestructively evaluating residual stress on a waterjet peening processed surface in a reactor. SOLUTION: Peening traces are sampled from an image photographed the waterjet peening processed surface. The whole area or the number of peening traces per unit area is measured. Then, the residual stress is evaluated by substituting it into a relational expression between the residual stress and the whole area or the number of peening traces, prepared in advance. Or, a surface area increasing rate after and before peening work is calculated, and the residual stress is evaluated by substituting it into a relational expression between the residual stress and surface area increasing rate, prepared in advance. Thus, the residual stress on the peening processed surface is nondestructively evaluated under internal circumstances in the nuclear reactor. COPYRIGHT: (C)2008,JPO&INPIT

Residual stress evaluation method for waterjet peening processed surface

PROBLEM TO BE SOLVED: To provide blasting technology capable of processing a surface of a work piece in a plazma treatment chamber with high accuracy of roughness SOLUTION: In this blasting device 300, a blasting means 200 and a roughening degree measuring means 400a as a blasting control means 400 are accommodated in a casing 110 The blasting means 200 is mounted in a blasting chamber 111, and the roughening degree measuring means 400a is mounted in a measuring chamber 401 defined through an openable and closeable door 111a in the blasting chamber 111 in adjacent to the blasting means A parameter input device 420 for setting various blasting conditions, and an analyzing device 430 for analyzing an average roughening degree, a rate of change of roughening degree on the basis of a result of the measurement of the roughening degree, are mounted as the blasting control means 400 COPYRIGHT: (C)2005,JPO&NCIPI

Blasting device and blasting method

PURPOSE: To enable a result of work to be decided for whether it is good or bad with no necessity of skill, by irradiating light from a gloss sensor to a surface, immediately after it is processed by peening work, and comparing a quantity of reflected light with the quantity of reflected light from a standard workpiece so as to decide whether the result of work is good or bad. CONSTITUTION: If short peening work is finished for a workpiece 22, it is carried outside a blast chamber 8 by a grip 23 of a workpiece attitude control device 7 and positioned to a gloss sensor 6 immediately after a time for which gloss of the workpiece is not changed. This gloss sensor 6, placing the workpiece 22 approaching to an optical fiber 27 in a distance l about 3cm, measures the gloss of a processed surface by a light emitting and a light receiving element 29, 30. And a quantity of reflecting light from a standard workpiece, set by previously studying a condition of compressed air pressure, machining time, etc. obtaining a predetermined peening effect, serves as a reference deciding a result of peening work for whether it is good or bed. COPYRIGHT: (C)1986,JPO&Japio

Toshiyuki Takahashi

Papers

Decision method of result from peening work