CN104690117B - The especially big radius elbow of large diameter thick wall steel pipe and its forming method - Google Patents
The especially big radius elbow of large diameter thick wall steel pipe and its forming method Download PDFInfo
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- CN104690117B CN104690117B CN201510142782.7A CN201510142782A CN104690117B CN 104690117 B CN104690117 B CN 104690117B CN 201510142782 A CN201510142782 A CN 201510142782A CN 104690117 B CN104690117 B CN 104690117B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000005452 bending Methods 0.000 claims abstract description 59
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 17
- 241000700608 Sagitta Species 0.000 claims description 19
- 238000000465 moulding Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
- B21D7/025—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a kind of especially big radius elbow of large diameter thick wall steel pipe and its forming method, especially big radius elbow is bent into by medium-frequency pipe bender；This especially big radius elbow includes multigroup straight length and bend loss, and this forming method comprises the steps：S1) dividing large diameter thick wall steel pipe according to the predetermined especially big bending radius of especially big radius elbow is continuous multistage unit pipes, and every segment unit pipe includes straight-run of pipe section and one section of bend loss；Large diameter thick wall steel pipe is placed in described medium-frequency pipe bender, and medium-frequency pipe bender bends the bend loss of unit pipes, bends the bend loss forming predefined curved radius；S3) propelling trolley of medium-frequency pipe bender promotes large diameter thick wall steel pipe, to the length distance of its mobile straight-run of pipe section；S4) repeat step S2)～S3), until bending the especially big radius elbow of formation.Break through the restriction bending radius of existing medium-frequency pipe bender using this forming method, the especially big radius elbow of formation, process is simple, simple operation can be processed.
Description
Technical field
The present invention relates to forming elbow technical field, the especially big radius elbow particularly to a kind of large diameter thick wall steel pipe and
Its forming method.
Background technology
The especially big radius elbow that large diameter thick wall steel pipe is formed is widely used in cast steel construction, especially big radius elbow master
It is applied to the curve modeling occasion such as girder, column of cast steel construction, such as stadiums, exhibition center, terminal etc. are big
In the building of type truss structure, its surface structure smoothness is attractive in appearance, force stability is preferable.Therefore, by large diameter thick wall steel pipe plus
The bend pipe that work forms especially big radius is increasingly subject to the concern of designer.
Large diameter thick wall steel pipe described in this patent refer to external diameter in the range of 300mm～1500mm, wall thickness 8mm～
Steel pipe in the range of 150mm；Bend pipe refers to meet the steel pipe setting bending curvature radius, is generally bent using straight tube and is formed,
And typically using Frequency Induction Heating technique, formation bend pipe is bent to bending of large diameter thick wall steel pipe；Especially big radius elbow refers to
Be that bending radius is large diameter thick wall steel pipe external diameter more than 50 times.
Frequency Induction Heating bent tube technique is the more advanced process bending for large diameter thick wall steel pipe, and it is curved
Pipe process is as follows：
First, by large diameter thick wall steel pipe chuck be fixed on can around the center of circle revolution crank arm on, by crank arm revolution dress
The screw-nut transmission adjustment bending radius put；Secondly, using load coil, steel pipe is heated to after uniform temperature
Start to push ahead and produce bending, in BENDING PROCESS, the propelling trolley of rear end provides thrust power for steel pipe, makes steel pipe slow
Evenly push ahead along directive wheel, the bending so that bending radius that steel pipe edge is adjusted deforms at heating；Then,
To spraying water at pipe deformation or spraying cold front heavy rain, finally give bend pipe.
Due to during using existing medium-frequency pipe bender, by revolution crank arm length limited, the limiting of equipment arrangement space, greatly
The bending radius of bore thick walled steel tube is usually no more than 6m.Especially big radius is constrained curved when therefore, using existing medium-frequency pipe bender
The manufacturing of pipe.
And in prior art, in order to bend the especially big radius elbow of one, need equipment is transformed, especially big to meet
Radius elbow bends action, that is, need special big bend pipe bending machine, and its transformation or coming of new equipment cost are higher；During to tube bending,
Heating tube bending part (i.e. the circular arc total length of this bend pipe), consumption electric energy is higher, and economic benefit is low.
In view of this it would be highly desirable to provide a kind of especially big radius elbow forming method of large diameter thick wall steel pipe, during breakthrough is existing
Frequency bending machine bends the restriction of radius, simply and easily bends especially big radius elbow, save energy consumption, reduces production cost.
Content of the invention
The purpose of the present invention is a kind of especially big radius elbow forming method of large diameter thick wall steel pipe of offer, using this molding
Method can break through the restriction bending radius of existing medium-frequency pipe bender, can process the especially big radius elbow of formation, process is simple, behaviour
It is convenient to make.On this basis, another object of the present invention is for providing a kind of especially big radius elbow of large diameter thick wall steel pipe.
For solving above-mentioned technical problem, the present invention provides a kind of especially big radius elbow molding side of large diameter thick wall steel pipe
Method, described large diameter thick wall steel pipe is bent into especially big radius elbow by medium-frequency pipe bender；Described especially big radius elbow molding side
Method comprises the steps：
S1 it is continuous for) dividing described large diameter thick wall steel pipe according to the predetermined especially big bending radius of described especially big radius elbow
Multistage unit pipes, every section of described unit pipes include straight-run of pipe section and one section of bend loss；
The corresponding predefined curved radius of described bend loss is not more than the maximum deflection radius of described medium-frequency pipe bender；
Central angle corresponding to unit pipes according to multistage determines the corresponding predefined curved angle of described bend loss；
S2) described large diameter thick wall steel pipe is placed in described medium-frequency pipe bender, and described medium-frequency pipe bender bends described unit
The bend loss of pipe, bends the bend loss forming predefined curved radius；
S3) the rear end propelling trolley of described medium-frequency pipe bender promotes described large diameter thick wall steel pipe, to its mobile one section of institute
State the length distance of straight length；
S4) repeat step S2)～S3), until bending the described especially big radius elbow of formation.
Using the especially big radius elbow forming method of above-mentioned large diameter thick wall steel pipe, by large diameter thick wall steel pipe to be bending
It is divided into multistage unit pipes, every segment unit pipe is formed by straight length and bend loss.The bend loss marking off can utilize existing intermediate frequency
Bending machine bends and is formed, and for the ease of bending, bend loss coordinates straight-run of pipe section to approximately form one section of arc of especially big radius elbow；
That is, large diameter thick wall steel pipe is processed in enough polygonal some of number by this forming method, approximate mould
Intend one section of circular circular arc.
In the concrete operation step of this forming method, predetermined especially big according to especially big radius elbow section to be formed first
The number of bending radius setup unit pipe, with the especially big radius elbow of sufficient approximation arc section.Then, merely with prior art
Medium-frequency pipe bender bend bend loss, simply and easily form one section of circular arc, then large diameter thick wall steel pipe advanced straight-run of pipe
The distance of segment length, thus carry out bending the bend loss of next segment unit pipe.Repeatedly bend, be finally completed especially big radius elbow
Bend.So, make full use of existing equipment, and break through it and bend the limitation of radius, bend the especially big radius elbow of formation, technique
Simply, simple operation, and processing cost, energy saving need not effectively be saved using special super large standard bending machine.
Alternatively, step S2) include following operation：
S21) grips of described medium-frequency pipe bender fix described unit pipes, so that the inflection point setting of described bend loss
Center in described medium-frequency pipe bender load coil；
S22 described medium-frequency pipe bender, described load coil heating described bend loss to be bending) are started；
S23) it is heated to predetermined temperature, start and bend action, and promote described large diameter thick wall steel pipe at a predetermined velocity；
S24, after) advancing the length distance of described bend loss, stop propulsion, bend.
Alternatively, step S3) include following operation：
S31) described chuck unclamps the described unit pipes of the correspondence gripping；
S32) start the length distance that propelling trolley promotes the mobile described accordingly straight length of described large diameter thick wall steel pipe,
So that the inflection point of described bend loss is arranged on the center of described load coil accordingly.
Alternatively, chuck outer rim when the length of every section of described straight length of setting is at least described medium-frequency pipe bender zero-bit state
Distance to load coil center.
Alternatively, the predefined curved radius of described bend loss is set as the maximum deflection radius of described medium-frequency pipe bender.
Alternatively, adjust the angle of bend of described bend loss, so that the sagitta of described especially big radius elbow and theoretical sagitta
Deviation within the specific limits.
The present invention also provides a kind of especially big radius elbow of large diameter thick wall steel pipe, during described large diameter thick wall steel pipe passes through
Frequency bending machine is bent into described especially big radius elbow；Described especially big radius elbow includes multigroup straight length and bend loss, described straight
Pipeline section, described bend loss replace the described especially big radius elbow connecting the predetermined especially big bending radius of formation.
This especially big radius elbow includes multigroup straight length and bend loss, and alternately connection formation is especially big by half for straight length and bend loss
That is to say, that this especially big radius elbow passes through in enough polygonal some of number, approximate simulation is circular for footpath bend pipe
One section of circular arc.The especially big radius elbow being arranged such can be bent to bend loss using existing medium-frequency pipe bender and be formed, process is simple,
Simple operation, time saving and energy saving；And, the solderless crack structure that this especially big radius elbow is integrated, its structural strength can reach engineering
Application requirement.
Alternatively, when described straight length is at least described medium-frequency pipe bender zero-bit state, chuck outer rim is to load coil
The distance at center.
Alternatively, the predefined curved radius of described bend loss is set as the maximum deflection radius of described medium-frequency pipe bender.
Alternatively, the angle of bend of described bend loss is arranged within the specific limits, so that the arch of described especially big radius elbow
The high deviation with theory sagitta is within the specific limits.
Brief description
Fig. 1 is medium-frequency pipe bender bending technique schematic diagram；
Fig. 2 is predetermined especially big radius elbow schematic diagram in specific embodiment；
Fig. 3 is the especially big radius elbow schematic diagram bending formation in specific embodiment.
Wherein, the corresponding relation between the reference in Fig. 1 to Fig. 3 and component names is：
Large diameter thick wall steel pipe 10, especially big radius elbow 20；
Unit pipes 21, straight length A, process section A ', bend loss B；
Predefined curved radius r, bend angles alpha, center of circle angle beta, predetermined especially big radius of curvature R, sagitta H；
Medium-frequency pipe bender 30；
Propelling trolley 31, directive wheel 32, load coil 33, chuck 34, crank arm 35.
Specific embodiment
The core of the present invention is a kind of especially big radius elbow forming method of large diameter thick wall steel pipe of offer, using this molding
Method breaks through the restriction bending radius of existing medium-frequency pipe bender, can process the especially big radius elbow of formation, process is simple, operation
Convenient.On this basis, another core of the present invention is for providing a kind of especially big radius elbow of large diameter thick wall steel pipe.
In order that those skilled in the art more fully understands technical scheme, below in conjunction with the accompanying drawings and specifically real
The present invention is described in further detail to apply example.
Refer to shown in Fig. 1, Fig. 2 and Fig. 3, Fig. 1 is medium-frequency pipe bender bending technique schematic diagram；Fig. 2 is specific embodiment
In predetermined especially big radius elbow schematic diagram；Fig. 3 is the especially big radius elbow schematic diagram bending formation in specific embodiment.
The present invention provides a kind of especially big radius elbow 20 forming method of large diameter thick wall steel pipe 10, large diameter thick wall steel pipe
10 are bent by existing medium-frequency pipe bender 30 and are formed, and wherein, especially big radius elbow 20 bends according to predetermined especially big radius of curvature R
Molding.
Multigroup straight length A and bend loss B is included using the especially big radius elbow 20 that this forming method is formed, straight length A and
Bend loss B replace connect, so, this forming method bends merely with medium-frequency pipe bender 30 of the prior art, to bend loss B according to
Secondary bend, thus cumulative form especially big radius elbow 20.This forming method need not be transformed to equipment, breaches intermediate frequency completely
Bending machine 30 bends the limitation of radius in actual applications, efficiently solves especially big radius elbow 20 bending technique complexity, expense
When laborious problem.
Specifically, be described in detail the step of this forming method with reference to Fig. 1, Fig. 2 and Fig. 3：
Step S1) to divide large diameter thick wall steel pipe 10 according to the predetermined especially big radius of curvature R of especially big radius elbow 20 be many
Segment unit pipe 21, every segment unit pipe 21 all includes straight-run of pipe section A and one section of bend loss B；
The corresponding predefined curved radius r of bend loss B is not more than the maximum deflection radius of medium-frequency pipe bender 30, its bend loss B
Corresponding bend angles alpha is according to unit pipes 21 corresponding center of circle angle beta determination, this center of circle angle beta and the especially big radius elbow 20 of corresponding section
Predetermined especially big radius of curvature R between relation, as follows：
β=2arcsin (l/2R)
Wherein, β is the corresponding central angle of unit pipes；R is to make a reservation for especially big bending radius；L is the length of unit pipes.
In conjunction with the triangular relationship shown in Fig. 3 and circular arc with straight line approximation relation it may be determined that the bend angles alpha of bend loss B is near
Seemingly for said units pipe corresponding center of circle angle beta.
After first the bend angles alpha of bend pipe being set as the numerical value of center of circle angle beta, then more now bend angles alpha is bent into
The sagitta of especially big radius elbow 20 is simulated checking, thus adjusting bend angles alpha again so as to the especially big radius elbow 20 that is bent into
Sagitta H and theoretical value between deviation within a predetermined range.
And then, the length of bend loss B is determined according to predefined curved radius r and bend angles alpha, then the length determining straight length A.
Especially big radius elbow 20 is formed paragraph by paragraph using above-mentioned multigroup straight length A and bend loss B, on the one hand, can be fully sharp
Bend the bend loss B compared with small-bend radius with existing medium-frequency pipe bender 30, without reforming equipment；On the other hand, by side number foot
Enough polygonal some sides, the circular one end circular arc of approximate simulation, thus, simply, easily form especially big radius curved
Pipe 20, time saving and energy saving, effectively improve working (machining) efficiency.
Step S2) large diameter thick wall steel pipe 10 is placed on medium-frequency pipe bender 30, phase is bent by medium-frequency pipe bender 30
The bend loss B answering is so as to be curved according to predefined curved radius r；
Specifically, this step S2) include following operation：
S21) large diameter thick wall steel pipe 10 is placed on medium-frequency pipe bender 30, and chuck 34 grips unit pipes 21, thus
Make corresponding bend loss B inflection point be arranged on medium-frequency pipe bender 30 load coil 33 center；
By above-mentioned requirements, large diameter thick wall steel pipe 10 is fixed on and can be cranked arm on 35 around center of circle revolution with chuck 34, tool
In body scheme, by screw-nut transmission, adjust to the maximum deflection radius of medium-frequency pipe bender 30, locking two is to guiding
Wheel 32, then the propelling trolley 31 locking rear end.So, large diameter thick wall steel pipe 10 to be bent is placed in medium-frequency pipe bender
30.Wherein, when bending the bend loss B of first paragraph unit pipes 21, final stage unit pipes 21, if the length of straight length A in front and back
Cannot meet corresponding medium-frequency pipe bender 30 physical dimension when, before and after being extended by welding interim process section A ' solve above-mentioned
Problem.
S22) start medium-frequency pipe bender 30 so as to load coil 33 heats bend loss B to be bending, thus for bending
Work is prepared.
S23) when being heated to predetermined temperature, start medium-frequency pipe bender 30 bends action, meanwhile, promotes dolly with predetermined
Speed promote large diameter thick wall steel pipe 10 move forward, thus gradually carrying out bending molding to bend loss B to be bending.
In a kind of specific embodiment, this predetermined temperature is set to 900 DEG C about, generally in practical engineering application, protects
Hold this temperature for a period of time, so that wall temperature reaches unanimity inside and outside large diameter thick wall steel pipe 10, then carry out again advancing, bend behaviour
Make.In the program, predetermined speed (driving velocity of propelling trolley 31) is set in the range of 10mm/min～15mm/min, with true
That protects bend loss B bends quality；Propelling trolley 31 promotes large diameter thick wall steel pipe 10 continuously to advance forward along directive wheel 32, cranks arm
35 rotate around fixing axle, thus bending molding bend loss B.Certainly, the driving velocity of the propelling trolley 31 in Practical Project
Should be set according to physical device and bending technique it is not limited to this.
S24) propulsion bend loss B length distance after, complete bending of this section of bend loss B, thus stop propulsion, bend dynamic
Make.
Complete step S2) after carry out step S3) operation, large diameter thick wall steel pipe 10 advances straight-run of pipe section by this step
The length distance of A, thus form a segment unit pipe 21.Specifically, this step includes operating as follows：
S31) chuck 34 unclamps fixing corresponding unit pipe 21.
S32) start the length that propelling trolley 31 promotes mobile straight-run of pipe section A of large diameter thick wall steel pipe 10, so that phase
The inflection point of the bend loss B to be bending answering is arranged on the center of load coil 33.
By S3 during step) after, form one section of complete unit pipes 21, i.e. one group of combination of straight length A and bend loss B,
Provide safeguard for bending of next section of bend loss B further.
Step S4) repeat step S2)～S3), complete bending of especially big radius elbow 20 paragraph by paragraph, until the bend loss of end
B bends molding.
In above-mentioned forming method, further, set the length of every section of straight length A.In a kind of specific embodiment, directly
The length of pipeline section A is set to chuck 34 outer rim during medium-frequency pipe bender 30 zero-bit state to the distance at load coil 33 center.
So, efficiently accomplish medium-frequency pipe bender 30 bend loss B is bent.
Certainly, the length of straight length A is not limited in being set to above-mentioned length, also can be larger than medium-frequency pipe bender 30 0
During the state of position, chuck 34 outer rim, to the distance at load coil 33 center, therefore, only need to enable medium-frequency pipe bender 30 reliable
Processing even bend pipe.
The predefined curved radius r of bend loss B in above-mentioned forming method is optimized, sets it to medium-frequency pipe bender 30
Maximum deflection radius.When carrying out bending process, seamlessly transitting of bend loss B and adjacent two straight length A can be optimized, enter one
Step lifts the manufacturability that this forming method processes especially big radius elbow 20.
Certainly, predefined curved radius r can be set according to the requirement that bends of the medium-frequency pipe bender 30 being adopted, and it is right only to need
Answer medium-frequency pipe bender 30 can complete the numerical value bending and can seamlessly transitting.
When setting the angle of bend of bend loss B, it is finely adjusted the especially big radius so as to be formed by said method further
Deviation between bend pipe 20 sagitta H and theoretical especially big radius elbow sagitta H within the specific limits (engineer applied can be controlled in ±
In the range of 3mm).So, effectively guarantee the degree of accuracy of the especially big radius elbow 20 using the processing formation of this forming method.
Below with by length as 9600m, caliber is as 610mm, thickness of pipe wall is as 32mm large diameter thick wall steel pipe 10, be bent into
Further explain as a example making a reservation for the especially big radius elbow 20 that especially big radius of curvature R is 60000mm, in theory, this is especially big by half
Sagitta H of footpath bend pipe 20 is 192mm.According to above-mentioned forming method, concrete procedure of processing is as follows：
First, it is bent into, according to required, the requirement that predetermined especially big radius of curvature R is 60000mm, this 9600mm is designed as
During 196 in shape wherein five.According to the requirement of processing technique, and after molding especially big radius elbow 20 specification, adjustment is each
The length on individual side.
Wherein, the length of each edge is 1920mm, and the length of as one segment unit pipe 21 bends work to be reliably completed
Skill, its two ends is set to straight-run of pipe section A (compensator section A ' at the two ends in Fig. 3) of 884mm length, for clamping；Meanwhile,
Also the setting of each segment unit pipe 21 of especially big radius elbow 20 can be met.In addition, large diameter thick wall steel pipe 10 is corresponding divides often
The length of segment unit pipe 21 is 1912mm, unit pipes 21 corresponding center of circle angle beta is 1.83 °.
Be the medium-frequency pipe bender 30 of 6000mm using maximum deflection radius, therefore, to should bend loss B predefined curved half
Footpath r is 6000mm, meanwhile, in the case that the bend angles alpha of corresponding bend loss B is 1.83 °, by multigroup straight length A and bend loss B
Sagitta H of the especially big radius elbow 20 being formed is more than the sagitta of theoretical arc track, and its deviation is more than 3mm, therefore, finely tunes this curved
Bent angle α to 1.76 ° to meet its sagitta H deviation in the range of 3mm, the arc length of corresponding bend loss B is 184mm.
After completing above-mentioned parameter setting and adjustment, then carry out above-mentioned bending operation.For this especially big radius elbow 20, will be big
Bore thick-wall bend is positioned over and bends paragraph by paragraph on medium-frequency pipe bender 30, low-angle curved in five same planes through being carried out continuously
System processing, thus complete especially big radius elbow 20 bends molding.So, the straight length A of the bend loss B and 1728mm of 184mm
Alternately connect, the radian of the theoretical especially big radius elbow 20 of approximate simulation is capable of in the polygon track of formation.Existing making full use of
On the basis of medium-frequency pipe bender 30, the deviation of acquisition arc track and sagitta H can fully meet the especially big radius of design requirement
Bend pipe 20.
In addition, the present invention also provides a kind of especially big radius elbow 20 of large diameter thick wall steel pipe 10, and this heavy caliber is thick
Wall steel pipe 10 is bent into especially big radius elbow 20 by medium-frequency pipe bender 30.Unlike the prior art, this especially big radius is curved
Pipe 20 includes multigroup straight length A and bend loss B, and straight length A and bend loss B replaces connection and forms predetermined especially big radius of curvature R
Especially big radius elbow 20, its bend loss B is bent by existing medium-frequency pipe bender 30 and is formed.
This especially big radius elbow 20 includes multigroup straight length A and bend loss B, and straight length A and bend loss B alternately connect formation
Especially big radius elbow 20 is that is to say, that this especially big radius elbow 20 passes through in enough polygonal some of number, approximately
One section of circular circular arc of simulation.The especially big radius elbow 20 being arranged such can be curved to bend loss B using existing medium-frequency pipe bender 30
System is formed, and process is simple, simple operation are time saving and energy saving；And, the solderless crack structure that this especially big radius elbow 20 is integrated, its
Structural strength can reach engineer applied requirement.
Further, chuck 34 outer rim is extremely when being slightly over medium-frequency pipe bender 30 zero-bit state for the distance of straight length A setting
The distance at load coil 33 center, to guarantee that medium-frequency pipe bender 30 bends to bend loss B.
Certainly, the length of straight length A is not limited in being set to above-mentioned length, also can be larger than medium-frequency pipe bender 30 0
During the state of position, chuck 34 outer rim, to the distance at load coil 33 center, therefore, only need to enable medium-frequency pipe bender 30 reliable
Processing even bend pipe.
The predefined curved radius r of bend loss B in above-mentioned forming method is optimized, sets it to medium-frequency pipe bender 30
Maximum deflection radius, so that it is guaranteed that the seamlessly transitting it is ensured that especially big radius is curved of bend loss B and the optimum of adjacent two straight length A
The crooked radian of pipe 20.
Certainly, predefined curved radius r can be set according to the requirement that bends of the medium-frequency pipe bender 30 being adopted, and only need to make
Especially big radius elbow 20 after bending has smooth radian.
The bend angles alpha of the bend loss B of this especially big radius elbow 20 can be finely adjusted, so that the especially big radius elbow being formed
Deviation between the sagitta of 20 sagitta H and theoretical arc track formation is in the range of ± 3mm.So, effectively guarantee using this one-tenth
The degree of accuracy of the especially big radius elbow 20 that the processing of type method is formed.
Above-mentioned deviation sets according to the requirement on machining accuracy of Practical Project, therefore, in the bend angles alpha of adjustment bend loss B
When should be finely adjusted according to actual deviation.
This especially big radius elbow 20 can be formed by above-mentioned forming method processing, thus, simply, easily it is processed into this spy
Large radius bend pipe 20.
Above a kind of especially big radius elbow and its forming method of large diameter thick wall steel pipe provided by the present invention is carried out
It is discussed in detail.Specific case used herein is set forth to the principle of the present invention and embodiment, above example
Explanation be only intended to help and understand the method for the present invention and its core concept.It should be pointed out that it is common for the art
For technical staff, under the premise without departing from the principles of the invention, the present invention can also be carried out with some improvement and modify, these
Improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. the especially big radius elbow forming method of a kind of large diameter thick wall steel pipe, described large diameter thick wall steel pipe passes through medium frequency bending of pipe
Machine (30) is bent into especially big radius elbow (20), and the bending radius of described especially big radius elbow (20) is described heavy caliber thick wall
More than 50 times of outer diameter of steel pipes；It is characterized in that, described especially big radius elbow (20) forming method comprises the steps：
S1) described large diameter thick wall steel pipe is divided according to the predetermined especially big bending radius (R) of described especially big radius elbow (20)
(10) it is continuous multistage unit pipes (21), every section of described unit pipes (21) includes straight-run of pipe section (A) and one section of bend loss
(B)；
The corresponding predefined curved radius (r) of bend loss (B) is not more than the maximum deflection radius of medium-frequency pipe bender (30)；
Central angle according to corresponding to multistage unit pipes (21) determines the corresponding angle of bend of described bend loss (B) (α)；
S2) described large diameter thick wall steel pipe is placed in described medium-frequency pipe bender (30), and described medium-frequency pipe bender (30) bends described
The bend loss (B) of unit pipes (21), bends the bend loss (B) forming predefined curved radius (r)；
S3) the rear end propelling trolley (31) of described medium-frequency pipe bender (30) promotes described large diameter thick wall steel pipe (10), to its shifting
The length distance of dynamic one section of described straight length (A)；
S4) repeat step S2)～S3), until bending the described especially big radius elbow (20) of formation.
2. large diameter thick wall steel pipe according to claim 1 especially big radius elbow (20) forming method it is characterised in that
Step S2) include following operation：
S21) chuck (34) of described medium-frequency pipe bender (30) grips described unit pipes (21), so that described bend loss (B)
Inflection point be arranged on the center of described medium-frequency pipe bender (30) load coil (33)；
S22 described medium-frequency pipe bender (30), described load coil (33) heating bend loss (B) to be bending) are started；
S23) it is heated to predetermined temperature, start and bend action, and promote described large diameter thick wall steel pipe (10) at a predetermined velocity；
S24, after) advancing the length distance of described bend loss (B), stop propulsion, bend.
3. the especially big radius elbow forming method of large diameter thick wall steel pipe according to claim 2 is it is characterised in that step
S3) include following operation：
S31) described chuck (34) unclamps the described unit pipes of the correspondence gripping (21)；
S32) start propelling trolley (31) promote the length of the mobile described accordingly straight length (A) of described large diameter thick wall steel pipe away from
From so that the inflection point of described bend loss (B) is arranged on the center of described load coil (33) accordingly.
4. the especially big radius elbow forming method of the large diameter thick wall steel pipe according to any one of claim 1-3, its feature
Be, set every section of described straight length (A) length be at least described medium-frequency pipe bender (30) zero-bit state when chuck (34) outward
Edge to load coil (33) center distance.
5. the especially big radius elbow forming method of the large diameter thick wall steel pipe according to any one of claim 1-3, its feature
It is, the predefined curved radius (r) of described bend loss (B) is set as the maximum deflection radius of described medium-frequency pipe bender (30).
6. the especially big radius elbow forming method of large diameter thick wall steel pipe according to claim 5 is it is characterised in that adjust
The angle of bend (α) of described bend loss (B), so that the sagitta (H) of described especially big radius elbow (20) is existed with the deviation of theoretical sagitta
In preset range.
7. the especially big radius elbow of a kind of large diameter thick wall steel pipe, it is curved that described large diameter thick wall steel pipe passes through medium-frequency pipe bender (30)
Make described especially big radius elbow (20), the bending radius of described especially big radius elbow (20) is outside described large diameter thick wall steel pipe
More than 50 times of footpath；It is characterized in that, described especially big radius elbow (20) includes multigroup straight length (A) and bend loss (B), described
Straight length (A), described bend loss (B) replace the described especially big radius elbow (20) connecting the predetermined especially big bending radius (R) of formation；
Described especially big radius elbow (20) adopts the especially big radius of the large diameter thick wall steel pipe any one of claim 1-6
Forming elbow method molding.
8. the especially big radius elbow of large diameter thick wall steel pipe according to claim 7 is it is characterised in that described straight length
(A) be at least described medium-frequency pipe bender (30) zero-bit state when chuck (34) outer rim to load coil (33) center away from
From.
9. the especially big radius elbow of the large diameter thick wall steel pipe according to claim 7 or 8 is it is characterised in that described bend pipe
The predefined curved radius (r) of section (B) is set as the maximum deflection radius of described medium-frequency pipe bender (30).
10. the especially big radius elbow of the large diameter thick wall steel pipe according to claim 7 or 8 is it is characterised in that described bend pipe
The angle of bend (α) of section (B) is arranged on certain limit, so that the sagitta (H) of described especially big radius elbow (20) and theoretical sagitta
Deviation is within a predetermined range.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107626782A (en) * | 2017-09-26 | 2018-01-26 | 张家港市立业机械有限公司 | High-precision full-automatic bending machine |
| CN108422157B (en) * | 2018-03-05 | 2020-02-21 | 北京首钢园区综合服务有限公司 | Cold bending wire connection installation method for arc-shaped air conditioner water pipe |
| CN109482687B (en) * | 2018-10-17 | 2020-10-09 | 北京市机械施工有限公司 | Large-diameter thick-wall steel pipe bending processing method and system |
| CN110434556B (en) * | 2019-06-28 | 2020-12-08 | 武汉船用机械有限责任公司 | Method for manufacturing tubular component |
| CN110314961B (en) * | 2019-07-29 | 2024-09-06 | 中国能源建设集团天津电力建设有限公司 | Socket type process pipe connecting device for intermediate frequency bent pipe of power station and use method of socket type process pipe connecting device |
| CN110369573B (en) * | 2019-08-15 | 2020-12-11 | 山东崇盛冶金氧枪有限公司 | Method and device for bending and forming large-diameter steel pipe |
| CN110735970A (en) * | 2019-09-12 | 2020-01-31 | 中国二冶集团有限公司 | Construction method for installing multiple continuous cold bent pipes of long-distance pipeline |
| CN112658066B (en) * | 2020-12-08 | 2021-09-28 | 湖南苏普锐油气装备科技有限公司 | Oil and gas pipeline hot bending processing method and device |
| CN113976663B (en) * | 2021-10-22 | 2023-05-23 | 中国原子能科学研究院 | Pressure pipe manufacturing method |
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| NL182378C (en) * | 1974-07-23 | 1988-03-01 | Daiichi Koshuha Kogyo Kk | Apparatus for hot bending of metal pipes or tubes. |
| JPS5645220A (en) * | 1979-09-21 | 1981-04-24 | Dai Ichi High Frequency Co Ltd | Bending method for metallic pipe |
| JPS6333121A (en) * | 1986-07-26 | 1988-02-12 | Dai Ichi High Frequency Co Ltd | Bending device for flat bar material |
| JP2000126821A (en) * | 1998-10-27 | 2000-05-09 | Babcock Hitachi Kk | Method for bending and device therefor |
| DE10240341A1 (en) * | 2002-08-27 | 2004-03-18 | Mannesmannröhren-Werke Ag | Method and device for inductively bending pipes |
| CN101987331B (en) * | 2009-07-31 | 2013-06-12 | 江苏申港锅炉有限公司 | Large-diameter small-bending radius medium frequency pipe bender |
| CN102189158B (en) * | 2011-03-23 | 2013-01-30 | 河北宇鹏重工管道装备制造有限公司 | Process for bending X100 steel grade large-caliber bent pipe through intermediate frequency induction heating |
| CN102248042B (en) * | 2011-06-01 | 2014-04-30 | 二重集团（德阳）重型装备股份有限公司 | Compound bending method and special intermediate-frequency pipe bender |
| CN102350452B (en) * | 2011-07-07 | 2013-11-27 | 株洲双菱科技有限公司 | Large-diameter radibending method of steel pipe and large-bend pipe bender |
| CN102632119B (en) * | 2012-04-09 | 2014-03-12 | 浙江东南网架股份有限公司 | Large-diameter thick-wall round steel pipe spatial bending manufacturing method and special detection jig frame thereof |
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