High-precision straightening method for zirconium alloy tubes
A zirconium alloy and high-precision technology, which is applied in the field of high-precision straightening of zirconium alloy pipes, can solve the problems that the fuel pipe has no ellipse, no rebound, the technical indicators are not ideal, and the overall requirements of the fuel pipe cannot be met.
Active Publication Date: 2014-07-16
辽宁银捷装备科技股份有限公司
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Problems solved by technology
The use of traditional straightening machines for straightening cannot avoid microcracks on the surface of the fuel pipe for the time being. Although a non-pressure straightening technology has emerged abroad, it can achieve the technical index requirements of no microcracks on the surface of the fuel pipe. The technical indicators of no ellipse and no rebound of the fuel pipe are still not ideal
Existing straightening technology is still unable to meet the comprehensive requirements of fuel pipe surface technical indicators
Method used
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[0046] A high-precision straightening method for zirconium alloy pipes, comprising the following steps:
[0047] Step 1: Determine the size parameters of the zirconium alloy pipe
[0048] In this embodiment, the outer diameter of the zirconium alloy pipe is 10 mm, and the wall thickness is 0.53 mm;
[0049] Step 2: Determine the structural parameters of the straightening machine
[0050] ① Determine the roll system structure of the straightening machine. In this embodiment, the straightening machine selects three groups of six-roller roll system structures;
[0051] ②Determine the roll shape of the straightening roll, and the straightening roll adopts a three-stage equal-curvature reverse-bending roll shape;
[0052] 3. Determine the angle between the straightening roller and the main engine platform. In the present embodiment, the angle between the straightening roller and the main engine platform is determined as 30 °;
[0053] ④ Determine the straightening lead, the calc...
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Abstract
The invention discloses a high-precision straightening method for zirconium alloy tubes and belongs to the technical field of tube straightening. Currently, the wall thickness of zirconium alloy fuel tubes (Zr-4) used by nuclear power generation equipment is only 0.53 mm, the zirconium alloy fuel tubes (Zr-4) used by the nuclear power generation equipment are extremely-thin-wall tubes, because the fuel tubes need to work in a high-pressure water cooling environment and the content of hydrogen ions in the environment is high, if micro cracks happen to the surface of the fuel tubes, the hydrogen ions can be adsorbed to the micro-crack positions very easily, consequently, the 'fragile hydrogen' phenomenon is generated, and nuclear leak risks caused by the orientation indexes of hydride of the fuel tubes are increased. A straightening roller adopted for the straightening method guarantees that the zirconium alloy tubes reach the even-pressure state in a roller gap, in the straightening process of the zirconium alloy tubes, compared with the straightening force applied by a common anti-bending straightening roller, the evenly-distributed straightening force only accounts for 1 / 3.3 of the straightening force applied by the common anti-bending straightening roller, it is avoided that the zirconium alloy tubes are pressed to micro cracks in the straightening process, and the micro-crack-free straightening purpose is achieved.
Description
technical field [0001] The invention belongs to the technical field of pipe straightening, in particular to a high-precision straightening method for zirconium alloy pipes. Background technique [0002] At present, the zirconium alloy fuel tube (Zr-4) used in nuclear power generation equipment has a wall thickness of only 0.53mm, which is an extremely thin-walled tube. Because the fuel tube needs to work in a high-pressure water-cooled environment, and the content of hydrogen ions in this environment is low Very high, if there are microcracks on the surface of the fuel pipe, hydrogen ions are easily adsorbed on the microcracks, resulting in "hydrogen embrittlement", which makes the hydride orientation of the fuel pipe exceed the standard, increasing the risk of nuclear leakage. [0003] The zirconium alloy fuel pipe needs to be straightened before it can be used, and the straightened fuel pipe needs to meet the surface technical specifications of no microcracks, no scratches...
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IPC IPC(8): B21D3/02
Inventor 谭叶林吕艳兰王丹阳候会文崔甫崔志昌王建民张帆方正义
Owner 辽宁银捷装备科技股份有限公司