CN105880940B - A kind of box bending component manufacturing method - Google Patents

A kind of box bending component manufacturing method Download PDF

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Publication number
CN105880940B
CN105880940B CN201610247075.9A CN201610247075A CN105880940B CN 105880940 B CN105880940 B CN 105880940B CN 201610247075 A CN201610247075 A CN 201610247075A CN 105880940 B CN105880940 B CN 105880940B
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China
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welding
web
moulding bed
plate
wing plate
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CN201610247075.9A
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Chinese (zh)
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CN105880940A (en
Inventor
邓凌云
李建宏
金伟波
么忠孝
兰旭旭
陈晨
侯利军
朱强
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中建钢构武汉有限公司
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Priority to CN201610247075.9A priority Critical patent/CN105880940B/en
Publication of CN105880940A publication Critical patent/CN105880940A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C1/00Building elements of block or other shape for the construction of parts of buildings

Abstract

The present invention is suitable for construction steel structure processing technique field, provides a kind of box bending component manufacturing method, comprising the following steps: (1) general assembly moulding bed is arranged;(2) part setting-out, blanking and splicing;(3) lower wing plate counterweight press mold molding on general assembly moulding bed is fixed;(4) web fitting displacement location assembly;(5) assembly localization of internal vertical and horizontal diaphragm and longitudinal reinforcement partition;(6) welding of diaphragm plate, longitudinal reinforcement partition and lower wing plate, web;(7) counterweight press mold positioning assembly upper flange;(8) it is segmented lower tire and turns over longitudinal reinforcement on the inside of welding equipment upper flange;(9) vertical downhand welding four longitudinal main welds are segmented;(10) divided reset size detection and key control point.Box bending component manufacture efficiency of the invention and precision controlling can be greatly improved, and plate fairing by hot working amount greatly reduces, and the forming of product surface fairing degree is beautiful, reduce manpower consumption and supplementary product onsumption, shorten fabrication cycle, have saved manufacturing cost.

Description

A kind of box bending component manufacturing method

Technical field

The invention belongs to construction steel structure processing technique field more particularly to a kind of box bending component manufacturing methods.

Background technique

With the raising of people's aesthetic level, various structure is complicated, and steel building handsome in appearance continuously emerges in city Downtown location.Traditional linear type and single type space structure has been unable to satisfy design requirement, and box bending component acts as Key player has not only played the material property of steel, even more strength and soft and graceful combination, has obtained high-end construction investment person Favor.The required precision of general box bending component manufacture is high, and difficulty of processing is big, and the manufacturing cycle is long, used device and artificial It is at high cost.

Box bending component manufacturing method in the prior art has following two:

1) wing web is set up into three-dimensional orthopedic moulding bed according to bending coordinate dimension and uses the side of fairing by flame on moulding bed Case shapes to control the bending of wing web, sets up box bending component general assembly solid moulding bed again later, and case is realized on moulding bed The whole spelling of body component welds.

Box bending component wing web is only capable of tending to wing web in terms of bending forming using the fairing by flame technique Approximation forming, is unable to satisfy the required precision of bending, also needs to adjust bending precision, this scheme by external force in component general assembly A large amount of moulding bed material is wasted, time for increasing component manufacturing process, cost of labor and production cycle is increased and is unfavorable for Batch production.

2) bending wing web is used into the thick o ing of Samsung roller trigger, then uses hydraulic press local directed complete set, set up again later Box bending component general assembly solid moulding bed, and realize that the whole spelling of box component welds on moulding bed.

Shape and hydraulic press roll forming process, wing web is made using the Samsung roller trigger roller in box bending component wing web Precision controlling in terms of bending forming is inadequate, need to also adjust by external force or the method for fairing by flame in component general assembly curved Precision is turned round, this scheme increases the manufacturing process of component, extends manufacture cycle, wastes equipment investment and occupy resources of production, significantly The producing efficiency for reducing component, increases cost of labor.

Therefore, both the above process is not able to satisfy box bending component low cost, high efficiency, high-precision manufacture are wanted It asks, is based on existing technical solution, a kind of manufacturing method of completely new box bending component need to be provided.

Summary of the invention

Technical problem to be solved by the present invention lies in provide a kind of inexpensive, high efficiency and high-precision box bending structure Part manufacturing method.

The invention is realized in this way a kind of box bending component manufacturing method, comprising the following steps:

(1) general assembly moulding bed is arranged;

(2) part setting-out, blanking and splicing;

(3) lower wing plate is fixed on general assembly moulding bed using counterweight press mold moulding process;

(4) web fitting displacement location is assembled and is fixed;

(5) assembly localization of internal diaphragm plate and longitudinal reinforcement partition;

(6) welding of diaphragm plate, longitudinal reinforcement partition and lower wing plate, web;

(7) using counterweight press mold molding positioning assembly upper flange;

(8) it is segmented the inside welding equipment longitudinal direction reinforcement partition after lower tire turns in upper flange.

Further, in the step (1): being laid with steel platform using steel plate, support two longitudinal edges and erected using fashioned iron To support, it is ensured that the stability of steel platform and moulding bed;The ground at four each control points of longitudinal edge of bending component is marked in plate platform Allowance line is cut at line-transect and both ends, and strikes loading blunderbuss point in corresponding position and D coordinates value and coordinate is marked to number, and moulding bed is taken If after complete being in spatial warping state.

Further, in the step (3): lower wing plate being hung on general assembly moulding bed temporary support and put in free state It sets, by the Analysis of toughness to lower wing plate, lower wing plate is positioned using counterweight stamper forming process on general assembly moulding bed;Under Wing plate is during counterweight pressing mold on general assembly moulding bed forms, two longitudinal edge control points pressing mold limit matched edge in side by the way of ceiling hammer Spot welding positioning, the plumb bob suspension centre for controlling longitudinal edge are overlapped with ground sample subpoint, make lower wing plate lower surface and the entirety spot welding of general assembly moulding bed It is fixed.

Further, in the step (4) the following steps are included:

(4.1) web makes web be fitted displacement dress along bottom wing edges of boards curve by the way of chain and jack auxiliary Match, web is examined with positioning set square with bottom wing edges of boards assemble below;

(4.2) web top examines each control point in top and ground sample to throw in such a way that positioning set square and plumb bob hang ground sample Shadow point is overlapped, and web upper edge is carried out spot welding with 3 D stereo moulding bed with positioning steel bar and is connected and fixed.

Further, in the step (5) the following steps are included:

(5.1) first tabula board group is soldered into;

(5.2) assembly line of diaphragm plate is drawn according to four angle point D coordinates values of diaphragm plate that drawing provides;

(5.3) assembly line of longitudinal reinforcement partition is marked according to the equal part curved arc line on lower wing plate;

(5.4) positioning diaphragm plate is first assembled according to each assembly line, reassembles longitudinal reinforcement partition, uses flame before assembly Rifle warms oneself by a fire longitudinal reinforcement partition bending.

Further, in step (6): the welding sequence of horizontal position welding longitudinal direction reinforcement partition after first vertical position welding diaphragm plate is formulated, it is horizontal The twin fillet wolt of partition and longitudinal reinforcement partition is more using the method for segmentation skip welding and using CO2 solid core welding wire low current multilayer It is welded in road point to control the welding deformation of lower wing plate and web.

Further, in step (7): upper flange need to control upper limb side and two coxostermums when with reorientation assembly Curve matching degree, the two opposite sides of upper flange while while with positioning set square pattern side matched edge jack adjust upper flange and abdomen The relative position of plate;Then the fillet weld of diaphragm plate and upper flange is welded on general assembly moulding bed.

Further, in step (8): tire turns over the assembly that longitudinal reinforcement partition is drawn on the inside of upper flange under segmentation Line, longitudinal reinforcement partition after flame has been baked again in strict accordance with the welding process requirement welding of horizontal position welding after first vertical position welding, to control The welding deformation of upper flange processed, it is ensured that the fairing degree of upper flange appearance.

Further, further comprising the steps of after the step (8):

(9) member segments to complete are erect and is placed, downhand welding is carried out to four longitudinal joints of component.

Further, further comprising the steps of after the step (9):

(10) simple jig frame is set, analog reset is carried out to member segments.

Compared with prior art, the present invention beneficial effect is: upper and lower wing plate of the invention forms work by configuring press mold Skill is fixed and web is by fitting positioning assembly, carries out plate fairing by hot working forming or machinery to it without mockup mold is separately provided Compression moulding reduces a large amount of moulding bed material, shortens fabrication cycle, has saved manufacturing cost, and producing efficiency and essence Degree is greatly improved.

Detailed description of the invention

Fig. 1 is that schematic diagram is arranged in general assembly moulding bed in box bending component process steps 1 provided in an embodiment of the present invention;

Fig. 2 is lower wing plate location and installation schematic diagram in step 3 of the present invention;

Fig. 3 is step 4 median ventral plate location and installation schematic diagram of the present invention;

Fig. 4 is diaphragm plate and longitudinal reinforcement partition location and installation schematic diagram in step 5 and step 6 of the present invention;

Fig. 5 is upper flange location and installation schematic diagram in step 7 of the present invention;

Fig. 6 be in step 8 of the present invention on the inside of upper flange welding equipment longitudinal direction reinforcement partition schematic diagram;

Fig. 7 is that four longitudinal seam schematic diagrames of vertical downhand welding are segmented in step 9 of the present invention;

Fig. 8 is that moulding bed is arranged in step 10 of the present invention to carry out segmentation coordinate points detection schematic diagram to component.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

It as shown in Figures 1 to 6, is a preferred embodiment of box bending component manufacturing method process of the invention, the system The method of making includes the following steps:

(1) general assembly moulding bed is arranged;

(2) part setting-out, blanking and splicing;

(3) lower wing plate 3 is fixed on general assembly moulding bed using counterweight press mold moulding process;

(4) web fitting displacement location is assembled and is fixed;

(5) assembly localization of internal diaphragm plate 13 and longitudinal reinforcement partition 12;

(6) welding of diaphragm plate 13, longitudinal reinforcement partition 12 and lower wing plate 3, web;

(7) using counterweight press mold molding positioning assembly upper flange 14;

(8) it is segmented the inside welding equipment longitudinal direction reinforcement partition 12 after lower tire turns in upper flange 14.

Refering to Figure 1, the general assembly moulding bed in above-described embodiment is arranged, following process is specifically included:

Steel platform 1 is laid with using the steel plate of 50~60mm thickness, supports the fashioned iron that two longitudinal edges use H (200~500) x200 Make the 3 D stereo moulding bed 2 of vertical supporting, to ensure the stability of steel platform 1 and 3 D stereo moulding bed 2;In plate platform 1 The ground line-transect and both ends cutting allowance line at four each control points of longitudinal edge of bending component are marked, and strikes loading blunderbuss point simultaneously in corresponding position In spatial warping state after marking D coordinates value and coordinate number, 3 D stereo moulding bed 2 to set up;Then to each control point three Dimensional coordinate values use tape measure and theodolite testing, and three-dimensional dimension controls within ± 2mm.

The step of part setting-out, blanking in above-described embodiment and splicing, is as follows:

1. part setting-out: in part, direction adds certain welding contraction and cutting surplus in advance in length and breadth.

2. part cutting mode and mark: bending special-shaped part all using etc. from Numerical control cutting blanking ensure blanking essence Degree, part groove are all opened up using semi-automatic cutting.Upper respective coordinates are marked to compile in four angle points after wing web part blanking Number, direction is distinguished when to assemble.

3. part splices: part uses the groove butt welding of straight line low-angle, needs to control wing web side length during welding And Diagonal Dimension.Above-mentioned wing web includes upper and lower wing plate and left and right wing plate.

It please refers to shown in Fig. 2, positioning of the lower wing plate 3 in above-described embodiment on the 3 D stereo moulding bed 2 of general assembly moulding bed Installation is fixed using counterweight stamper forming process, and specifically, lower wing plate 3 is hung on general assembly moulding bed temporary support in free state It places, by the Analysis of toughness to lower wing plate 3, lower wing plate 3 is compression molded on general assembly moulding bed using counterweight on general assembly moulding bed Type technique is positioned, in the present embodiment by carrying out swaging positioning by adding ballast box 4 in the upper surface of lower wing plate 3. Lower wing plate 3 on general assembly moulding bed counterweight pressing mold form during, two longitudinal edge control points need to by the way of ceiling hammer side pressing mold limit Matched edge spot welding positioning, the plumb bob suspension centre for controlling longitudinal edge are overlapped with ground sample subpoint.So that 3 lower surface of lower wing plate and general assembly moulding bed On the whole spot welding of 3 D stereo moulding bed 2 fix.

In above-described embodiment, the location and installation of lower wing plate 3 be not separately provided mockup mold it is carried out fairing by flame or The forming of person's mechanical compaction reduces a large amount of part fire thus and rectifys moulding bed material, cost of labor, manufacturing field and reduce manufacture week Phase, and be directly to assemble to position to lower wing plate 3 during counterweight press mold is molding, lower wing plate 3 is examined while swaging Whether sideline is overlapped with ground sample control point, is required with determining that the positioning accuracy of lower wing plate 3 meets manufacture.

It please refers to shown in Fig. 3, the web fitting displacement location assembly in above-described embodiment specifically comprises the following steps:

1. the left web 8 and right web 9 of the left and right sides make left web 8 and the right side in such a way that chain 5 and jack 6 assist Web 9 is fitted displacement assembly along 3 side curve of lower wing plate, left web 8 is following, right web 9 below with the positioning of 3 side of lower wing plate Set square 7 examines assembly.

2. left web 8 and 9 top of right web examine top respectively to control in such a way that positioning set square 7 hangs ground sample with plumb bob Point is overlapped with ground sample subpoint, and left and right web upper edge and 3 D stereo moulding bed 2 are carried out spot welding connection with positioning steel bar 10 It is fixed.

The positioning assembling process of above-mentioned left web 8 and right web 9 is not separately provided mockup mold and carries out fiery rectify to it Forming and mechanical compaction forming, reduce thus a large amount of a large amount of part fire rectify moulding bed material, cost of labor, manufacturing field and It reduces the manufacturing cycle, and left web 8 and right web 9 make left web 8 and right abdomen by the way of chain and jack auxiliary Plate 9 is fitted displacement assembly along 3 side curve of lower wing plate, left web 8 and 9 upper sideline of right web is examined while assembling whether It is overlapped with ground sample control point, it has been determined that the positioning accuracy of left web 8 and right web 9 meets manufacture and requires.

Please referring collectively to shown in Fig. 4,13 He of localization of internal diaphragm plate is assembled in above-described embodiment on lower wing plate 3 and web Longitudinal reinforcement partition 12, specifically comprises the following steps:

1. 13 groups of diaphragm plate are soldered into first.

2. drawing the assembly line of diaphragm plate 13 according to 13 4 angle point D coordinates values of diaphragm plate that drawing provides.

3. marking the assembly line of longitudinal reinforcement partition 12 according to equal part curved arc line of longitudinal reinforcement on lower wing plate 3.

4. first assembling positioning diaphragm plate 13 according to each assembly line, longitudinal reinforcement partition 12 is reassembled, before assembly using fire Flame rifle warms oneself by a fire longitudinal reinforcement partition 12 bending, makes longitudinal reinforcement partition 12 in bending.

After the completion of diaphragm plate 13 and longitudinal reinforcement 12 location and installation of partition, then by diaphragm plate 12, longitudinal reinforcement partition 13 It is welded with lower wing plate 3, wing plate, specifically: the welding of horizontal position welding longitudinal direction reinforcement partition 12 is suitable after the first vertical position welding diaphragm plate 13 of formulation Sequence, diaphragm plate 13 and the twin fillet wolt of longitudinal reinforcement partition 12 using the method for being segmented skip welding and use CO2 solid core welding wire small It is welded in electric current multilayer multiple tracks point to control the welding deformation of lower wing plate 3 and left abdomen 8, right web 9.

The purpose of above-mentioned diaphragm plate 13, longitudinal reinforcement partition 12 and the welding procedure of lower wing plate 3, web is to make to weld It scoops out power and is cancelled out each other with lower wing plate 3, web using the rebound internal stress that external force imposed deformation generates, with the bending of control member Size is able to satisfy required precision.

Please referring collectively to shown in Fig. 5, upper flange 14 is assembled using the molding positioning of counterweight pressing mold in above-described embodiment, specifically Ground, in the present embodiment, it is left that upper flange 14 need to control upper limb side and two sides when carrying out using ballast box 4 with reorientation assembly The curve matching degree of web 8 and right wing plate 9, the two opposite sides of upper flange 14 while while used with 7 pattern side matched edge of positioning set square Jack adjusts the relative position of upper flange 14 and web, and the angle of diaphragm plate 13 and upper flange 14 is then welded on general assembly moulding bed Weld seam, the liner groove weld medicine core CO2 welding wire bottom welding of four longitudinal edges of component, weld bead height are slightly below base material surface. Component end is welded and fixed using positioning set square 7, to guarantee the Diagonal Dimension of component port;Add 3 to 4 among component port Road vertical supporting is to guarantee the opening size of upper flange and lower wing plate.

Please refer to shown in Fig. 6, be segmented in above-described embodiment after lower tire turns over 14 inside welding equipment longitudinal direction reinforcement of upper flange every The detailed process of plate 12 are as follows: be segmented lower tire and turn over the assembly line for drawing longitudinal reinforcement partition 12 on the inside of upper flange 14, Zong Xiangjia It is reassembled after the first flame curved of muscle partition 12;Since upper flange 14 downward, is contacted with ground without fixation at this time, 14 inside of upper flange Longitudinal reinforcement partition 12 welding when, in strict accordance with the welding process requirement welding of horizontal position welding after first vertical position welding, to control upper limb The welding deformation of plate 14, it is ensured that the fairing degree of 14 appearance of upper flange.

It please refers to shown in Fig. 7, longitudinally adds after tire turns under segmentation in the above-described embodiments in 14 inside welding equipment of upper flange After muscle partition 12 is completed, by the vertical placement of the member segments to complete, to four longitudinal edges of component according to direction of twist system Fixed reasonable welding sequence uses CO2 flux-cored wire to carry out downhand welding to ensure weldquality and appearance requirement longitudinal seam.

It please refers to shown in Fig. 8, after completing four longitudinal seams of the vertical downhand welding of member segments, carries out divided reset ruler Very little detection and key control point, detailed process are as follows: setting simple jig frame carries out analog reset to member segments;It is vertical to component four Weld seam is polished after side flaw detection is qualified;It is measured using four angle points of the total station to component both ends;Among four longitudinal edges of component It respectively extracts 3 control points to measure, the coordinate value of four angle points of priority control two ends;By component ends length and width, diagonal line Scale error controls within the scope of ± 3mm, can reach Eligibility requirements.

In conclusion box bending component manufacturing method of the invention is segmented directly in general assembly moulding bed over-assemble, wing plate Whole counterweight pressing mold molding, web are using jack and the positioning of chain auxiliary Fast Fitting, optimization internal structure on general assembly tire Welding procedure make wing web external force force stress cancel out each other with welding stress, to substantially reduce the assembly time of component With the cost of labor of welding deformation correction.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (6)

1. a kind of box bending component manufacturing method, which comprises the following steps:
(1) general assembly moulding bed is arranged, and moulding bed is set up after the completion in spatial warping state;
(2) part setting-out, blanking and splicing;
(3) lower wing plate is fixed on general assembly moulding bed using counterweight press mold moulding process;Specifically, lower wing plate is hung to general assembly moulding bed It is placed on temporary support in free state, by the Analysis of toughness to lower wing plate, counterweight is used to lower wing plate 3 on general assembly moulding bed Stamper forming process is positioned, by carrying out swaging positioning by adding ballast box in the upper surface of lower wing plate;Lower wing plate During counterweight pressing mold on general assembly moulding bed forms, two longitudinal edge control points side pressing mold limit need to examine edge point by the way of ceiling hammer Weldering positioning, the plumb bob suspension centre for controlling longitudinal edge is overlapped with ground sample subpoint, so that the three-dimensional on lower wing plate lower surface and general assembly moulding bed Three-dimensional moulding bed entirety spot welding is fixed;
(4) web fitting displacement location is assembled and is fixed;Specifically, the left web at left and right sides of (4.1) and right web are using lock The mode of chain and jack auxiliary makes left web and right web be fitted displacement assembly along bottom wing edges of boards curve, under left web Side, right web are examined with positioning set square with bottom wing edges of boards assemble below;(4.2) left web and right web top are using positioning three The mode that gusset and plumb bob hang ground sample examines each control point in top to be overlapped with ground sample subpoint, and with positioning steel bar for left and right abdomen Plate upper edge carries out spot welding with 3 D stereo moulding bed and is connected and fixed;
(5) assembly localization of internal diaphragm plate and longitudinal reinforcement partition;Specifically, tabula board group is soldered by (5.1) first; (5.2) assembly line of diaphragm plate is drawn according to four angle point D coordinates values of diaphragm plate that drawing provides;(5.3) added according to longitudinal Equal part curved arc line of the muscle on lower wing plate marks the assembly line of longitudinal reinforcement partition;(5.4) positioning is first assembled according to each assembly line Diaphragm plate reassembles longitudinal reinforcement partition, and longitudinal reinforcement partition is warmed oneself by a fire bending using flame gun before assembly, makes longitudinal reinforcement Partition is in bending;
(6) welding of diaphragm plate, longitudinal reinforcement partition and lower wing plate, web;
(7) using counterweight press mold molding positioning assembly upper flange;Specifically, upper flange is carried out using ballast box with reorientation dress Timing need to control the curve matching degree on upper limb side Yu the left web in two sides and right wing plate, the two opposite sides of upper flange while while position Set square pattern side matched edge adjusts the relative position of upper flange and web with jack, then welds tabula on general assembly moulding bed The fillet weld of plate and upper flange;
(8) it is segmented the inside welding equipment longitudinal direction reinforcement partition after lower tire turns in upper flange.
2. box bending component manufacturing method as described in claim 1, which is characterized in that in step (1): being spread using steel plate If steel platform, two longitudinal edges are supported using fashioned iron and make vertical supporting, it is ensured that the stability of steel platform and moulding bed;In plate platform The ground line-transect and both ends cutting allowance line at four each control points of longitudinal edge of bending component are marked, and strikes loading blunderbuss point simultaneously in corresponding position Mark D coordinates value and coordinate number.
3. box bending component manufacturing method as claimed in claim 1 or 2, which is characterized in that in step (6): formulating first The twin fillet wolt of the welding sequence of horizontal position welding longitudinal direction reinforcement partition after vertical position welding diaphragm plate, diaphragm plate and longitudinal reinforcement partition, which uses, to be divided The method of section skip welding and the welding that lower wing plate and web are controlled using welding in CO2 solid core welding wire low current multilayer multiple tracks point are become Shape.
4. box bending component manufacturing method as described in claim 1, which is characterized in that in step (8): tire turns under segmentation The assembly line of longitudinal reinforcement partition is drawn on the inside of upper flange, longitudinal reinforcement partition is after flame has been baked again in strict accordance with elder generation The welding process requirement welding of horizontal position welding after vertical position welding, to control the welding deformation of upper flange, it is ensured that the fairing degree of upper flange appearance.
5. box bending component manufacturing method as described in claim 1, which is characterized in that in the step
(8) further comprising the steps of after:
(9) member segments to complete are erect and is placed, downhand welding is carried out to four longitudinal joints of component.
6. box bending component manufacturing method as claimed in claim 5, which is characterized in that in the step
(9) further comprising the steps of after:
(10) simple jig frame is set, analog reset is carried out to member segments.
CN201610247075.9A 2016-04-20 2016-04-20 A kind of box bending component manufacturing method CN105880940B (en)

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CN106914732A (en) * 2017-03-09 2017-07-04 青岛中兴源电器厂 A kind of preparation method of inside television support member
CN107442823B (en) * 2017-06-23 2019-11-05 成都飞机工业(集团)有限责任公司 A kind of high-rate wireless LAN method of large span vallecular cavity
CN108544190B (en) * 2018-04-18 2020-06-02 中铁山桥集团有限公司 Manufacturing method of bent box-shaped steel tower segment
CN109551176A (en) * 2018-10-18 2019-04-02 沪东中华造船(集团)有限公司 A kind of production method of steel runner automobile wind tunnel nozzle segment

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CN100579712C (en) * 2007-11-26 2010-01-13 中铁大桥局集团第七工程有限公司 Firstly hole drilling construction method in girder steel hole-drilling
CN101259579B (en) * 2008-04-14 2010-04-14 北京城建集团有限责任公司 Processing method for box type space bending component
CN101524804B (en) * 2009-03-27 2011-03-23 中建钢构有限公司 Steel member manufacturing method
CN103056616B (en) * 2012-12-26 2016-05-18 江苏沪宁钢机股份有限公司 A kind of bending box component and manufacturing process thereof
CN103206044A (en) * 2013-03-29 2013-07-17 浙江东南网架股份有限公司 Local-concave irregular arc-shaped box-type member and preparation method thereof
CN103659182B (en) * 2013-12-03 2015-09-23 中建钢构江苏有限公司 The preparation method of bending box beam 360 ° of spiral stairses
CN104763049B (en) * 2015-02-11 2017-02-01 中建钢构江苏有限公司 Multi-weld-joint crossed steel member and fabrication method thereof

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