CN104801565A - Manufacturing method of large-diameter pipeline elbows - Google Patents
Manufacturing method of large-diameter pipeline elbows Download PDFInfo
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- CN104801565A CN104801565A CN201510195765.XA CN201510195765A CN104801565A CN 104801565 A CN104801565 A CN 104801565A CN 201510195765 A CN201510195765 A CN 201510195765A CN 104801565 A CN104801565 A CN 104801565A
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- trigonometric function
- function curve
- steel plate
- diameter
- elbow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
- B21C37/286—Making tube fittings for connecting pipes, e.g. U-pieces starting from sheet material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention discloses a manufacturing method of large-diameter pipeline elbows. The manufacturing method comprises the following steps: determining the diameter d, the bending angle alpha, the bending radius R and the number n of equal-length segments, of a large-diameter pipeline elbow; determining a trigonometric function curve Y formed by flattening an intersecting line; drawing symmetrical Y and Y1 on a steel plate of which the width is Pi d, and the longest distance L between Y and Y1 is R sin(alpha/2mn); the rest is done in the same manner till the trigonometric function curve Yn is drawn; cutting the steel plate along Y, Y1...Yn, and adopting interval cutting; rolling the obtained steel pieces after cutting so as to make steel pipes, and then performing secondary cutting so as to enable the rolled steel pieces to completely separate from each other and to be formed into n wedge-shaped pipes; assembling the wedge-shaped pipes so as to form a large-diameter assembled elbow; welding the connecting positions of the large-diameter assembled elbow together. The manufacturing method disclosed by the invention has the advantages of being low in operation cost, and being flexible and convenient in the production manner, and is suitable for manufacturing large-diameter pipeline elbows in small-batch.
Description
Technical field
The present invention relates to a kind of large-diameter pipeline elbow-making method, belong to steel building mounting technique field.
Background technology
Build and overhaul engineering at flue, as in the engineerings such as two sudden strain of a muscle mixing chamber, desulfurization duct, flue gas during smelting pipeline, usually can be applied to the large-diameter pipeline elbow of the steel of diameter comparatively large (maximum gauge can reach 3400 ~ 3500 millimeters).For above-mentioned large-diameter pipeline elbow, the manufacture craft of comparatively specification is there is no in prior art, the less pipeline of thickness is adopted to be conducive to bending, but the less then mechanical strength of one side thickness is not good and service life is shorter, the radian transition of bending is not evenly with level and smooth on the other hand, thus affects the fluency of pneumatic convey; The pipeline adopting thickness larger is then difficult to bending, and usually adopt the mode of directly casting to make, the above-mentioned production method production cycle is long, and is not suitable for the manufacturing of be pilot.
Summary of the invention
The present invention for the deficiency that prior art exists, provides a kind of large-diameter pipeline elbow-making method, meets actual operation requirements just.
For solving the problem, the technical solution used in the present invention is as follows:
A kind of large-diameter pipeline elbow-making method, comprises the following steps:
Step one, the diameter d determining large-diameter pipeline elbow, bent angle alpha, radius of curvature R, large-diameter pipeline elbow is divided into n section by angle of bend, the large-diameter pipeline elbow being divided into n section comprises n curved transition sections, and the radian corresponding to each described curved transition sections is α/n;
Step 2, determine that two diameters are the straight tube axes intersect of d and the angle of cut is 180 ° of-α/n time intersection, by described intersection axis flattening formation trigonometric function curve Y:f(x around straight tube)=ksin(2x/d) or f(x)=kcos(2x/d), wherein k=0.5dsin(α/2n);
Step 3, on the steel plate of width for π d with the width of steel plate for x-axis draws the trigonometric function curve Y described in step 2, and be symmetrical in the trigonometric function curve Y1 of described trigonometric function curve Y for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y and described trigonometric function curve Y1 is Rsin(α/2n); Be symmetrical in the trigonometric function curve Y2 of described trigonometric function curve Y1 again for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y1 and described trigonometric function curve Y2 is Rsin(α/2n); By that analogy until draw trigonometric function curve Yn;
Step 4, by the described steel plate in step 3 along described trigonometric function curve Y, Y1 until Yn cuts, and carry out cut-space during cutting, to ensure that each several part is still connected thus is convenient to follow-up steel pipe and rolls operation;
Step 5, the described steel plate having carried out cut-space is delivered on rolling machine, with the length direction of described steel plate for axially carrying out steel pipe rolls operation, then by the steel pipe that rolls into along described trigonometric function curve Y, Y1 until Yn secondary cut, each several part is separated completely and forms n taper pipe;
The edge of the most strong point L of the most weakness S of step 6, the length of described taper pipe that rolls in step 5 and length is made respectively and is indicated A point and B point, n described taper pipe assembled and the described A point of adjacent described taper pipe and described B point are overlapped, thus forming a major diameter combined elbow;
Step 7, each junction of major diameter combined elbow described in step 6 to be welded together.
As the improvement of technique scheme, described steel plate in step 3 is that some sub-steel plate side-by-side parallel is coplanar combines, and angle of bend in step 5 during the pipe crimping of each described sub-steel plate for its width on the circle of radius for R as the angle that the radian corresponding to arc length is converted into.
Compared with prior art, implementation result of the present invention is as follows in the present invention:
Large-diameter pipeline elbow-making method of the present invention, has operating cost low, and mode of production advantage easily flexibly, is suitable for the making of the large-diameter pipeline elbow of small lot.
Accompanying drawing explanation
Fig. 1 is the structural representation of large-diameter pipeline elbow-making method light plate line of cut of the present invention;
Fig. 2 is the product structure schematic diagram of large-diameter pipeline elbow-making method of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiments content of the present invention is described.
Large-diameter pipeline elbow-making method described in the present embodiment, comprises the steps:
Step one, the diameter d determining large-diameter pipeline elbow, bent angle alpha, radius of curvature R, large-diameter pipeline elbow is divided into n section by angle of bend, the large-diameter pipeline elbow being divided into n section comprises n curved transition sections, and the radian corresponding to each described curved transition sections is α/n; The numerical value of n is larger, then the mistake of large-diameter pipeline elbow is getted over gently; Particularly as shown in Figure 2, large-diameter pipeline elbow bent angle alpha is 90 °, and is divided into one section according to often bending 15 °, is divided into 6 sections altogether.
Because common rolling machine width is 2 ~ 3 meters, therefore need to select sub-steel plate width according to the hands-on background of rolling machine; And determine that steel plate splicing to become width to be the steel plate of π d by radius of curvature R according to above-mentioned; The concrete diameter d as large-diameter pipeline elbow is 2380 millimeters, then three pieces of width can be selected to be that the sub-steel plate splicing of 2491 millimeters becomes overall width to be that the steel plate of 7473 millimeters is for subsequent use; For the ease of the splicing of three blocks of sub-steel plates, groove can be offered in sub-edges of plate, so that follow-up weld job.
Step 2, determine that two diameters are the straight tube axes intersect of d and the angle of cut is 180 ° of-α/n time intersection, by described intersection axis flattening formation trigonometric function curve Y:f(x around straight tube)=ksin(2x/d) or f(x)=kcos(2x/d), wherein k=0.5dsin(α/2n).
Step 3, as shown in Figure 1, in step one on the width of the splicing steel plate that is π d with the width of steel plate for x-axis draws the trigonometric function curve Y described in step 2, and be symmetrical in the trigonometric function curve Y1 of described trigonometric function curve Y for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y and described trigonometric function curve Y1 is Rsin(α/2n); Be symmetrical in the trigonometric function curve Y2 of described trigonometric function curve Y1 again for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y1 and described trigonometric function curve Y2 is Rsin(α/2n); By that analogy until draw trigonometric function curve Yn.
Step 4, by the described steel plate in step 3 along described trigonometric function curve Y, Y1 until Yn cuts, and carry out cut-space during cutting, often can cut 300 millimeters particularly and stay 50 millimeters, roll operation to ensure that each several part is still connected thus is convenient to follow-up steel pipe.
Step 5, the described steel plate having carried out cut-space is delivered on rolling machine, with the length direction of described steel plate for axially carrying out steel pipe rolls operation, particularly, will every sub-steel plate bending 60 °; Then by the steel pipe that rolls into along described trigonometric function curve Y, Y1 until Yn secondary cut, each several part is separated completely and forms n taper pipe; Then each sub-Plate Welding is formed together an overall steel plate.
The edge of the most strong point L of the most weakness S of step 6, the length of described taper pipe that rolls in step 5 and length is made respectively and is indicated A point and B point, as shown in Figure 2, n described taper pipe is assembled and the described A point of adjacent described taper pipe and described B point are overlapped, thus form a major diameter combined elbow, fan-shaped skewback can be used particularly to be supported on the inner side of major diameter combined elbow, for making the concyclic heart of each described curved transition sections of composition major diameter combined elbow, namely cavetto is carried out to major diameter combined elbow.
Step 7, each junction of major diameter combined elbow described in step 6 to be welded together; Particularly, welding sequence is first by major diameter combined elbow interior welds together, then sets level elbow with hanger, welds the outside of major diameter combined elbow, avoid overhead welding as far as possible with vertical position welding and downhand welding; Note in welding process observing deformation, revised in time and carry out support anti-deformation and steady job, prevent major diameter combined elbow from rolling and hurt sb.'s feelings.
Above content is detailed description made for the present invention in conjunction with specific embodiments, can not assert that the present invention specifically implements to be only limitted to these explanations.For those skilled in the art, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to the scope of protection of the invention.
Claims (2)
1. a large-diameter pipeline elbow-making method, is characterized in that, comprising:
Step one, the diameter d determining large-diameter pipeline elbow, bent angle alpha, radius of curvature R, large-diameter pipeline elbow is divided into n section by angle of bend, the large-diameter pipeline elbow being divided into n section comprises n curved transition sections, and the radian corresponding to each described curved transition sections is α/n;
Step 2, determine that two diameters are the straight tube axes intersect of d and the angle of cut is 180 ° of-α/n time intersection, by described intersection axis flattening formation trigonometric function curve Y:f(x around straight tube)=ksin(2x/d) or f(x)=kcos(2x/d), wherein k=0.5dsin(α/2n);
Step 3, on the steel plate of width for π d with the width of steel plate for x-axis draws the trigonometric function curve Y described in step 2, and be symmetrical in the trigonometric function curve Y1 of described trigonometric function curve Y for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y and described trigonometric function curve Y1 is Rsin(α/2n); Be symmetrical in the trigonometric function curve Y2 of described trigonometric function curve Y1 again for symmetry axis draws with the straight line being parallel to x-axis, and the distance making the longest distance place L between described trigonometric function curve Y1 and described trigonometric function curve Y2 is Rsin(α/2n); By that analogy until draw trigonometric function curve Yn;
Step 4, by the described steel plate in step 3 along described trigonometric function curve Y, Y1 until Yn cuts, and carry out cut-space during cutting, to ensure that each several part is still connected thus is convenient to follow-up steel pipe and rolls operation;
Step 5, the described steel plate having carried out cut-space is delivered on rolling machine, with the length direction of described steel plate for axially carrying out steel pipe rolls operation, then by the steel pipe that rolls into along described trigonometric function curve Y, Y1 until Yn secondary cut, each several part is separated completely and forms n taper pipe;
The edge of the most strong point L of the most weakness S of step 6, the length of described taper pipe that rolls in step 5 and length is made respectively and is indicated A point and B point, n described taper pipe assembled and the described A point of adjacent described taper pipe and described B point are overlapped, thus forming a major diameter combined elbow;
Step 7, each junction of major diameter combined elbow described in step 6 to be welded together.
2. large-diameter pipeline elbow-making method as claimed in claim 1, it is characterized in that, described steel plate in step 3 is that some sub-steel plate side-by-side parallel is coplanar combines, and angle of bend in step 5 during the pipe crimping of each described sub-steel plate for its width on the circle of radius for R as the angle that the radian corresponding to arc length is converted into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195765.XA CN104801565A (en) | 2015-04-23 | 2015-04-23 | Manufacturing method of large-diameter pipeline elbows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195765.XA CN104801565A (en) | 2015-04-23 | 2015-04-23 | Manufacturing method of large-diameter pipeline elbows |
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| Publication Number | Publication Date |
|---|---|
| CN104801565A true CN104801565A (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510195765.XA Pending CN104801565A (en) | 2015-04-23 | 2015-04-23 | Manufacturing method of large-diameter pipeline elbows |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111032240A (en) * | 2017-06-14 | 2020-04-17 | 克利弗兰工具及机械公司 | Apparatus and method for making a duct member |
| CN112008280A (en) * | 2020-08-28 | 2020-12-01 | 上海宝冶集团有限公司 | Manufacturing method of rectangular flue elbow |
| CN113953775A (en) * | 2021-11-17 | 2022-01-21 | 中冶陕压重工设备有限公司 | Optimized manufacturing method of welding elbow |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1379776A (en) * | 1963-10-18 | 1964-11-27 | Airgaine | Elbow for connecting two conduits extending in any direction |
| GB2149040A (en) * | 1983-10-31 | 1985-06-05 | Foster Wheeler Energy Corp | Fabricating pipe elbows |
| US4841616A (en) * | 1987-08-03 | 1989-06-27 | The Charles Stark Draper Laboratory, Inc. | Helically wound elbow conduit and method of fabricating same |
| CN1118620A (en) * | 1993-03-01 | 1996-03-13 | 林登公司 | Kit and method for producing a connector for fluid-conducting elements |
| JP2008039174A (en) * | 2006-08-03 | 2008-02-21 | Zeru Work Kk | Corrugated heat insulation plate for elbow |
| CN103692171A (en) * | 2014-01-10 | 2014-04-02 | 点夺机电工程江苏有限公司 | Making method of shrimp elbow |
-
2015
- 2015-04-23 CN CN201510195765.XA patent/CN104801565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1379776A (en) * | 1963-10-18 | 1964-11-27 | Airgaine | Elbow for connecting two conduits extending in any direction |
| GB2149040A (en) * | 1983-10-31 | 1985-06-05 | Foster Wheeler Energy Corp | Fabricating pipe elbows |
| US4841616A (en) * | 1987-08-03 | 1989-06-27 | The Charles Stark Draper Laboratory, Inc. | Helically wound elbow conduit and method of fabricating same |
| CN1118620A (en) * | 1993-03-01 | 1996-03-13 | 林登公司 | Kit and method for producing a connector for fluid-conducting elements |
| JP2008039174A (en) * | 2006-08-03 | 2008-02-21 | Zeru Work Kk | Corrugated heat insulation plate for elbow |
| CN103692171A (en) * | 2014-01-10 | 2014-04-02 | 点夺机电工程江苏有限公司 | Making method of shrimp elbow |
Non-Patent Citations (1)
| Title |
|---|
| 李方晖: "钢制虾米弯头数解法展开", 《管道技术与设备》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111032240A (en) * | 2017-06-14 | 2020-04-17 | 克利弗兰工具及机械公司 | Apparatus and method for making a duct member |
| CN111032240B (en) * | 2017-06-14 | 2022-05-24 | 克利弗兰工具及机械有限责任公司 | Apparatus and method for making a piping structure |
| CN112008280A (en) * | 2020-08-28 | 2020-12-01 | 上海宝冶集团有限公司 | Manufacturing method of rectangular flue elbow |
| CN113953775A (en) * | 2021-11-17 | 2022-01-21 | 中冶陕压重工设备有限公司 | Optimized manufacturing method of welding elbow |
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Application publication date: 20150729 |