CN101699259B - Method for simulating bent pipe deformation by bending - Google Patents
Method for simulating bent pipe deformation by bending Download PDFInfo
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- CN101699259B CN101699259B CN2009101980006A CN200910198000A CN101699259B CN 101699259 B CN101699259 B CN 101699259B CN 2009101980006 A CN2009101980006 A CN 2009101980006A CN 200910198000 A CN200910198000 A CN 200910198000A CN 101699259 B CN101699259 B CN 101699259B
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Abstract
The invention provides a method for simulating bent pipe deformation by bending. The method is characterized by including the steps that: strip sample for bending the length of which is not less than 150mm is processed, the surface of the sample is required to be smooth without defect; even drawing is carried out on the side of the strip sample for bending along thickness direction, a horizontal line is drawn on the maximum surface in tension of the sample, points of intersection are formed between the horizontal line and evenly spaced vertical lines, separation distances of all points and sample size are measured accurately; bend cores with different diameters are selected according to test requirement, and bending test is carried out on a bending test device; separation distances of all points after bending are accurately measured, deformation is calculated by distance change of drawing before and after bending, and deformation=(separation distances of all points after bending-original separation distance)/original separation distance*100%. The invention can obtain samples with different stretch and compression deformations in one process by adopting bending test, time and material are saved, the simulation is more close to stress state of actual bend.
Description
Technical field
The present invention relates to a kind of method, belong to station boiler steel pipe pipe bending technique field with crooked simulation bent pipe deformation.
Background technology
Need to experience distortion manufacture processes such as bend pipe in the station boiler manufacture process, the material require that deflection is bigger is done the thermal treatment of removing stress.In heat treatment process, the crystal grain of austenitic steel can be grown up, and influences performance.Therefore need heat-treat test to the steel pipe of different distortion amount, the grow up tendency and the prevention method of research crystal grain.For the sample of different distortion amount, need take different Technologies for Heating Processing.In order to obtain different deflection samples, domestic have the method for utilizing the acquisition different distortion amount sample that stretches, but tension test can only obtain the sample of stretcher strain, can not obtain the sample of compression deformation, and necking down appears in drawing process easily, and the specimen preparation success ratio is low.And adopt bending test once can obtain the sample of different stretch and compress variation, save time and material.
At present, boiler industry begins to use in a large number the fine grained austenite steel pipe, and thermal treatment is very big to the grain size influence, so need study the Technology for Heating Processing of different distortion dimension pipe, therefore, press for simply, easily going and effective method of proposition simulation different distortion amount.
Summary of the invention
The purpose of this invention is to provide a kind of method of simulating the different distortion amount.
In order to achieve the above object, technical approach of the present invention has provided a kind of method with crooked simulation bent pipe deformation, it is characterized in that step is:
Step 1, processing length are not less than the bending bar-shaped sample of 150mm, and the surface of this sample needs smooth and zero defect;
Step 4, the accurate distance of measuring between the each point of crooked back are calculated deflection by the variable in distance between the line of crooked front and back, deflection=(each dot spacing-primary leading of crooked back)/primary leading * 100%.
Further, even line described in the step 2 is meant in bending circumferentially evenly rules along the every interval 10mm of thickness direction with the side of bar-shaped sample, is divided into 10 zones.
The present invention adopts bending test once can obtain the sample of different stretch and compress variation, saves time and material, and is more approaching with the stress state of actual elbow.
Description of drawings
Fig. 1 is the original state synoptic diagram of employed bending test equipment among the present invention;
Fig. 2 is the intermediateness synoptic diagram of employed bending test equipment among the present invention;
Fig. 3 is the end-state synoptic diagram of employed bending test equipment among the present invention.
Embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
A kind of method provided by the invention with crooked simulation bent pipe deformation, step is:
Step 1, processing length are not less than the bending bar-shaped sample of 150mm, and the surface of this sample needs smooth and zero defect.
Step 4, the accurate distance of measuring between the each point of crooked back are calculated deflection by the variable in distance between the line of crooked front and back, deflection=(each dot spacing-primary leading of crooked back)/primary leading * 100%.
If adopting said method line up diameter is 45mm, wall thickness is that the steel pipe sampling of 9.2mm is tested, and its concrete steps and parameter are:
Step 1, intercepting band sample, through digging, grinding processing, specimen size is 150 * 12.5 * 9.2mm.
Step 4, the accurate distance of measuring between the each point of curved back, maximum tension surface data following (mm): 9.76,10.40,10.94,11.82,12.60,12.58,12.46,11.32,10.22,9.86.According to the length variations before and after crooked, calculate each section deflection and be respectively: 0,2.97%, 12.55%, 17.26%, 27.27%, 27.58%, 26.88%, 12.97%, 4.50%, 0.
Can obtain the sample of different stretch deflection by above step, obtain the sample of different compress variations as need, only need standardized horizontal line on the maximum pressure surface of original sample, this horizontal line and at interval uniform vertical line form intersection point, accurately measure the distance between the each point, repeat the sample that as above step can access different compress variations.
Claims (1)
1. method with bending simulation bent pipe deformation is characterized in that step is:
Step 1, processing length are the bending bar-shaped sample of 150mm, and the surface of this sample needs smooth and zero defect;
Step 2, evenly rule along thickness direction with the side of band sample in bending, since an end, apart from end points 25mm place is starting point, every standardized line of 10mm, draw 10 sections, each standardized horizontal line on the maximum tension surface of sample or maximum pressure surface, two horizontal lines with at interval uniformly vertical lines form intersection points, accurately measure distance and specimen size between the each point;
Step 3, select the curved core of different-diameter according to the test needs, in the enterprising line bend test of bending test equipment;
Step 4, the accurate distance of measuring between the each point of bending back, by the variable in distance calculating deflection between the line of crooked front and back, deflection=(preceding each dot spacing of crooked each dot spacing-bending of back)/crooked preceding each dot spacing * 100%.
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CN2009101980006A CN101699259B (en) | 2009-10-30 | 2009-10-30 | Method for simulating bent pipe deformation by bending |
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CN2009101980006A CN101699259B (en) | 2009-10-30 | 2009-10-30 | Method for simulating bent pipe deformation by bending |
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CN101699259A CN101699259A (en) | 2010-04-28 |
CN101699259B true CN101699259B (en) | 2011-08-31 |
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Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101894456B (en) * | 2010-06-18 | 2013-06-19 | 李华 | Wireless remote controlled water quality monitoring boat based on machine vision and control method thereof |
CN102305744A (en) * | 2011-05-23 | 2012-01-04 | 哈尔滨工业大学 | Device and method for intelligently measuring joint bending angles of welding and connection of dissimilar materials |
CN102494948A (en) * | 2011-12-09 | 2012-06-13 | 上海锅炉厂有限公司 | Method for simulating deformation of tension side of elbow by tension |
CN103048206B (en) * | 2012-12-12 | 2015-05-27 | 中冶天工集团有限公司 | Method for 180-degree bending mechanical property testing plate |
KR102090560B1 (en) * | 2013-04-11 | 2020-03-19 | 삼성디스플레이 주식회사 | Apparatus for bending and the method of bending using the same. |
CN105784470A (en) * | 2016-04-10 | 2016-07-20 | 济南天辰试验机制造有限公司 | 180-degree bending test fixture |
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