CN106180460B - Controlled rolling, controlled cooling and cold bending comprehensive forming method for variable-section U-shaped steel - Google Patents
Controlled rolling, controlled cooling and cold bending comprehensive forming method for variable-section U-shaped steel Download PDFInfo
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- CN106180460B CN106180460B CN201610525197.XA CN201610525197A CN106180460B CN 106180460 B CN106180460 B CN 106180460B CN 201610525197 A CN201610525197 A CN 201610525197A CN 106180460 B CN106180460 B CN 106180460B
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- 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
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
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- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
- C23G1/26—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions using inhibitors
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- Organic Chemistry (AREA)
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Abstract
The invention discloses a controlled rolling, controlled cooling and cold bending comprehensive forming method for variable-section U-shaped steel. The controlled rolling, controlled cooling and cold bending comprehensive forming method mainly comprises the following steps: (1) conveying a longitudinal shearing steel band into a forming rack through a clamping and conveying device to realize cold bending initial deformation of a U-shaped steel piece; (2) conveying the steel piece into a heating region to realize controlled heating; (3) conveying the steel piece into a controlled rolling deformation region to synchronously realize variable section controlled rolling and cold bending finishing forming; (4) conveying the steel piece into a controlled cooling region to realize the material organization performance; and (5) conveying the steel piece into a finishing sizing region to guarantee an accurate form and location tolerance, cleaning the steel piece with derusting cleaning fluid, then storing the steel piece, and quickly removing rusts from the surface of the steel without damaging the surface of a metal structure. According to the controlled rolling, controlled cooling and cold bending comprehensive forming method for the variable-section U-shaped steel, local section deformation and cold bending forming for a set position are simultaneously completed; different materials are subjected to differential treatment; a heating procedure, a rolling procedure and a cooling procedure are designed according to the textures and the organization properties of the materials. The materials mainly comprise low-alloy high-strength steel subjected to controlled rolling and controlled cooling, such as bridge structural steel and building structural steel, and steel organizations such as ferrite-pearlite steel and dual-phase steel.
Description
Technical field
The present invention relates to steel structure forming technical field, be specifically related to a kind of controlled rolling and controlled cooling of the U-shaped steel of variable cross-section with it is cold
Curved comprehensive shaping method.
Background technology
In Construction of Steel Structure, such as bridge cross bridge floor board is mainly made up of floorings, crossbeam and U-shaped steel；As built
Main frame structure, is made up of steel plate, square, U-shaped and H profile steel；If the U-shaped steel sheet pile of clod wash is by local hot rolling in Cold Bending
Into crotch-shaped, the crotch-shaped of traditional cold roll forming is changed, meet engineering construction and keep away water requirement, substitute hot-rolled steel sheet pile.
The U-shaped steel that at present bridge is adopted is broadly divided into the U-shaped steel of uiform section and the U-shaped steel of variable cross-section, and the U-shaped steel of uiform section is in recent years
To occur many reports with regard to tired disease both at home and abroad, the fatigue life of steel bridge deck is caused much smaller than bridge main body requirement
Design life.Experience have shown that, in the U-shaped steel of above-mentioned uiform section, the crack quantity of steel box-girder top board and U-shaped steel commissure
Many, harm is big, repair difficult, the reason for produce this fatigue crack：One is that U-shaped steel can only be from because U-shaped steel is closed configuration
Outside one side welding, is generally welded using 75~85% partial penetration, leaves 15~25% incomplete fusion part, about 1~
The incomplete fusion part of 2mm, this 1~2mm itself forms a natural initial crack, becomes fatigue crack source, in wheel load
Under repeated action, cause top board with the easy fatigue cracking in U-shaped steel commissure；Two be U-shaped steel top board weld seam part it is non-with U-shaped steel
Welding position compares its section thickness and reduces by 1~2mm, and sectional area reduces, and causes junction to have certain bias, and bias can be led at this
Additional bending moment is caused to form stress concentration, so as to created fractures.After fatigue crack is produced, bridge floor panel stiffness will be reduced and directly led
Cause deck paving is damaged, and mats formation damage the crack progressing for also aggravating floorings in turn, aggravates the reduction of fatigue life, and the country is very
Often maintenance is exactly this problem to many steel box girder bridge floor paving Jing.The U-shaped steel of variable cross-section increases the bonding area with floorings, weld seam
It is solid and reliable, improve the integrally-built stability of bridge.The welding of the U-shaped steel of steel plate and variable cross-section of building body frame structure
Weld seam increases welding depth, improves weld seam rigidity；U-shaped steel base local increases thickness, improves steel construction rigidity.
The content of the invention
Present invention solves the technical problem that being to provide a kind of controlled rolling and controlled cooling and the clod wash comprehensive shaping side of the U-shaped steel of variable cross-section
Method, realizes partial cross section's deformation of setting position with cold roll forming while completing, and is treated with a certain discrimination according to material, according to it
Material and structure property design heating cycle, rolling pattern and cooling system.The main low-alloy high-strength steel including controlled rolling and controlled cooling,
Such as structural steel for bridge, building structural steel, steel tissue such as ferritic-pearlitic steel or dual phase steel.
The technical scheme is that：A kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section, main bag
Include following steps：
1) slitting steel band enters forming frame, and the steel thickness range is 4~16mm, realizes the clod wash initial set of steel part；
2) enter heating region, realize control heating, mode of heating be superaudio sensing heating, fuel gas heating or
Frequency Induction Heating, width of heating is 20~200mm, and heated length is 20~500mm；
3) into controlled rolling deformed area, controlled rolling fixed point changes section configuration, including edge thickness increases or thinning and shape
Shape changes, design attitude local thickness and alteration of form on section, controlled rolling variable cross-section and clod wash precisive shaped be same frame complete or
Intersect frame to complete, synchronously realize controlled rolling variable cross-section and clod wash precisive shaped；
4) control cooling zone is entered, the type of cooling is using water-cooled, mist is cold or air is cooled down, and realizes material structure performance；
5) into finishing shaping area, including using pass aligning, excessively curved plus recurvation finishing sizing molding, it is ensured that accurate morpheme
Tolerance, it is ensured that finished size is stable.
The partial cross section for realizing setting position deforms with cold roll forming while complete, and being distinguished according to material
Treat, according to its material and structure property design heating cycle, rolling pattern and cooling system.It is main to include the low of controlled rolling and controlled cooling
Alloy high-strength steel, such as structural steel for bridge, building structural steel, tissue such as ferritic-pearlitic steel or the dual phase steel of steel.
Further, a kind of controlled rolling and controlled cooling of the described U-shaped steel of variable cross-section and clod wash comprehensive shaping method, mainly include with
Lower step：
1) slitting steel band enters forming frame by clamping and conveying device, and the steel thickness range is 4-16mm, in normal temperature state
Under, through the roll of one group of longitudinal arrangement, slitting steel band both sides are bent, make plate both sides produce bending angle, also, press
The posterior dress roller arrangement of the direction of motion of plate makes bending angle gradually increase, until set angle (30-50 °), makes just one-step forming U
Type, realizes the clod wash initial set of steel part；
2) enter heating region, realize control heating, mode of heating be superaudio sensing heating, fuel gas heating or
Frequency Induction Heating, heating-up temperature installs attemperator in 300~1050 DEG C of scopes, between heating region and rolling mold,
Width of heating is 20~200mm, and heated length is 20~500mm, and heating cycle will according to roll bending and clod wash product material capability
Formulation, roll bending is asked to adopt Frequency Induction Heating mode, clod wash product to adopt superaudio induction heating mode；
3) into controlled rolling deformed area, implement controlled rolling system, rolling temperature control, drafts, deformation system, warm-rolling or
Hot rolling realizes that shape changes, and controlled rolling fixed point changes section configuration, including edge thickness increases or thinning and shape changes
Design attitude local thickness and alteration of form in change, section, synchronously realize that controlled rolling variable cross-section and clod wash precisive shaped (bend to design
Angle 60-90 °)；
4) enter control cooling zone, the type of cooling using water-cooled, mist be cold or air cooling, rate of cooling be 10 DEG C/s~
100 DEG C/s, realize material structure performance；
5) into finishing shaping area, finishing shaping area is finishing sizing region, the sizing finishing constituted with plain-barreled roll and side roller
Machine, including using pass aligning, curved plus recurvation finishing sizing molding excessively, sizing amount is according to U-shaped steel bending radius and wall thickness everywhere
Difference, the sizing finishing in the range of 0.3~0.45mm, tolerance can be controlled within ± 0.25mm, it is ensured that precisely morpheme is public
Difference, meets service precision requirement.
Further, preserve after is cleaned with derusting cleaning liquid the U-shaped steel of the variable cross-section for finally producing.
Further, the derusting cleaning liquid by mass percentage, is mainly prepared from by following component：Carbonic acid
Nickel 1-2%, manganese nitrate 1-2%, stannous chloride 1-3%, citric acid 5-8%, methyl cellosolve 1-1.5, butyl cellosolve 1-
1.5%th, thiodiglycol 0.3-0.5%, polyglycereol 0.2-0.6%, Polyethylene Glycol 2-6%, corrosion inhibiter 0.05-0.12%, chelating
Agent 0.01-0.03%, emulsifying agent 0.2-0.3%, balance of distilled water.
Further, the corrosion inhibiter is mercaptobenzothiazoler.
Further, the chelating agen is sodium versenate or tetrasodium ethylenediamine tetraacetate.
Further, the emulsifying agent is alkoxide cyclohexanedimethanol.
Further, the ph values of the derusting cleaning liquid are 6.5-7.5, will not so damage the surface of metal structure,
When formation in the metal structure and environmental friendliness, fireballing rust cleaning of rust cleaning.
Compared with prior art, the invention has the beneficial effects as follows：
First, present invention achieves U-shaped steel clod wash initial set, local shape change, clod wash essence it is cold into the control of, deformed region
But, the combination of finishing sizing, the partial cross section's deformation for realizing the Cold Bending of setting position is online with cold roll forming
Complete.
Second, present invention achieves the cooling of Cold Bending steel On-line Control computer heating control roll control, realizes material group
Knit the controllable of performance.
3rd, the variable cross-section U rows steel that the present invention is prepared into is preserved after being cleaned with special derusting and cleaning agent, not only can be fast
The rust of speed removal steel surface, and the surface of metal structure will not be damaged, it is also harmless to environment.
Description of the drawings
Fig. 1 is rolling and clod wash mould schematic diagram；
Fig. 2 is clod wash mould schematic diagram；
Fig. 3 is the U-shaped product made from steel figure of embodiment Bridge 1 beam variable cross-section；
Fig. 4 is the U-shaped product made from steel figure of the construction steel structure variable cross-section of embodiment 2.
Wherein, 1- rollings and clod wash mould, 2- clod wash moulds, the U-shaped steel of 3- bridge variable cross-sections, 4- construction steel structure variable cross-sections
U-shaped steel.
Specific embodiment
Embodiment 1
The controlled rolling and controlled cooling of the U-shaped product made from steel of bridge variable cross-section and clod wash comprehensive shaping method, mainly include the following steps that：
1) slitting steel band enters forming frame by clamping and conveying device, and the steel thickness range is 8mm, under normal temperature state,
Through the roll of one group of longitudinal arrangement, slitting steel band both sides are bent, make plate both sides produce bending angle, also, pressing board
The posterior dress roller arrangement of the direction of motion of material makes bending angle gradually increase, until 40 °, make just one-step forming U-shaped, realize the cold of steel part
Curved initial set；
2) heating region is entered, control heating is realized, mode of heating is superaudio sensing heating, and heating-up temperature is at 300 DEG C
Scope, installs attemperator between heating region and rolling mold, and width of heating is 50mm, and heated length is 200mm；
3) into controlled rolling deformed area, implement controlled rolling system, rolling temperature control, drafts, deformation system, warm-rolling or
Hot rolling realizes that shape changes, and controlled rolling fixed point changes section configuration, including edge thickness increases or thinning and shape changes
Design attitude local thickness and alteration of form in change, section, synchronously realize controlled rolling variable cross-section and clod wash precisive shaped, and bending angle reaches
72°；
4) control cooling zone is entered, the type of cooling is using water-cooled, mist is cold or air is cooled down, and rate of cooling is 10 DEG C/s, real
Existing material structure performance；
5) into finishing shaping area, the sizing finishing machine constituted with plain-barreled roll and side roller, including using pass aligning, it is excessively curved plus
Recurvation finishing sizing molding, sizing amount according to U-shaped steel bending radius and wall thickness everywhere difference, the sizing essence in the range of 0.3mm
Whole, tolerance can be controlled within ± 0.25mm, it is ensured that accurate form and position tolerance, meet service precision requirement；
6) preserve after is cleaned with derusting cleaning liquid the U-shaped steel of the variable cross-section for finally producing, the derusting cleaning liquid presses matter
Amount percentages, are mainly prepared from by following component：Nickelous carbonate 1%, manganese nitrate 1%, stannous chloride 1%, citric acid
5%th, methyl cellosolve 1%, butyl cellosolve 1%, thiodiglycol 0.3%, polyglycereol 0.2%, Polyethylene Glycol 2%, sulfydryl benzene
And thiazole 0.05%, sodium versenate 0.01%, alkoxide cyclohexanedimethanol 0.2%, balance of distilled water, rust cleaning
The ph values of cleanout fluid are 6.5, will not so damage the surface of metal structure, when the metal structure and environmental friendliness, speed of rust cleaning
Formed in fast rust cleaning.
Embodiment 2
The controlled rolling and controlled cooling of the U-shaped product made from steel of construction steel structure variable cross-section and clod wash comprehensive shaping method, mainly including following step
Suddenly：
1) slitting steel band enters forming frame by clamping and conveying device, and the steel thickness range is 8mm, under normal temperature state,
Through the roll of one group of longitudinal arrangement, slitting steel band both sides are bent, make plate both sides produce bending angle, also, pressing board
The posterior dress roller arrangement of the direction of motion of material makes bending angle gradually increase, until 50 °, make just one-step forming U-shaped, realize the cold of steel part
Curved initial set；
2) enter heating region, realize control heating, mode of heating be superaudio sensing heating, fuel gas heating or
Frequency Induction Heating, heating-up temperature installs attemperator in 1050 DEG C of scopes, between heating region and rolling mold, and heating is wide
Spend for 200mm, heated length is 500mm；
3) into controlled rolling deformed area, implement controlled rolling system, rolling temperature control, drafts, deformation system, warm-rolling or
Hot rolling realizes that shape changes, and controlled rolling fixed point changes section configuration, including edge thickness increases or thinning and shape changes
Design attitude local thickness and alteration of form in change, section, synchronously realize controlled rolling variable cross-section and clod wash precisive shaped, and bending angle reaches
90°；
4) control cooling zone is entered, the type of cooling is using water-cooled, mist is cold or air is cooled down, and rate of cooling is 60 DEG C/s, real
Existing material structure performance；
5) into finishing shaping area, the sizing finishing machine constituted with plain-barreled roll and side roller, including using pass aligning, it is excessively curved plus
Recurvation finishing sizing molding, sizing amount according to U-shaped steel bending radius and wall thickness everywhere difference, the sizing essence in the range of 0.45mm
Whole, tolerance can be controlled within ± 0.25mm, it is ensured that accurate form and position tolerance, meet service precision requirement；
6) preserve after is cleaned with derusting cleaning liquid the U-shaped steel of the variable cross-section for finally producing, the derusting cleaning liquid presses matter
Amount percentages, are mainly prepared from by following component：Nickelous carbonate 2%, manganese nitrate 2%, stannous chloride 3%, citric acid
8%th, methyl cellosolve 1.5%, butyl cellosolve 1.5%, thiodiglycol 0.5%, polyglycereol 0.6%, Polyethylene Glycol 6%, mercapto
Base benzothiazole 0.12%, tetrasodium ethylenediamine tetraacetate 0.03%, alkoxide cyclohexanedimethanol 0.3%, balance of distilled water,
The ph values of derusting cleaning liquid are 6.5-7.5, will not so damage the surface of metal structure, as the metal structure and environment friend of rust cleaning
Formed in good, fireballing rust cleaning.
With the above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is complete
Entirely various change and modification can be carried out in the range of without departing from this invention technological thought.The technology of this invention
Property scope is not limited to the content in description, it is necessary to its technical scope is determined according to right.
Claims (6)
1. a kind of controlled rolling and controlled cooling of the U-shaped steel of variable cross-section and clod wash comprehensive shaping method, it is characterised in that mainly including following step
Suddenly：
1) slitting steel band enters forming frame by clamping and conveying device, and the steel thickness range is 4-16mm, under normal temperature state, Jing
The roll of one group of longitudinal arrangement is crossed, slitting steel band both sides are bent, make plate both sides produce bending angle, also, by plate
The posterior dress roller arrangement of the direction of motion make bending angle gradually increase, bend to 30-50 ° of set angle, make just one-step forming U-shaped,
Realize the clod wash initial set of steel part；
2) heating region is entered, control heating is realized, mode of heating is superaudio sensing heating, fuel gas heating or intermediate frequency
Sensing heating, heating-up temperature installs attemperator in 300~1050 DEG C of scopes, between heating region and rolling mold, heating
Width is 20~200mm, and heated length is 20~500mm；
3) into controlled rolling deformed area, controlled rolling system, rolling temperature control, drafts, deformation system, warm-rolling or hot rolling are implemented
Realize that shape changes, controlled rolling fixed point changes section configuration, including edge thickness increases or thinning and alteration of form, disconnected
Mian Shang design attitudes local thickness and alteration of form, synchronously realize controlled rolling variable cross-section and clod wash precisive shaped, bend to design angle
60-90°；
4) enter control cooling zone, the type of cooling using water-cooled, mist be cold or air cooling, rate of cooling be 10 DEG C/s~100 DEG C/
S, realizes material structure performance；
5) into finishing shaping area, the sizing finishing machine constituted with plain-barreled roll and side roller, including using pass aligning, excessively curved plus recurvation
Finishing sizing molding, sizing amount according to U-shaped steel bending radius and wall thickness everywhere difference, the sizing in the range of 0.3~0.45mm
Finishing, tolerance can be controlled within ± 0.25mm, it is ensured that accurate form and position tolerance, meet service precision requirement.
2. a kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section as claimed in claim 1, its feature exists
In preservation after the U-shaped steel of the variable cross-section for finally producing is cleaned with derusting cleaning liquid.
3. a kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section as claimed in claim 2, its feature exists
In the derusting cleaning liquid by mass percentage, is mainly prepared from by following component：Nickelous carbonate 1-2%, manganese nitrate 1-
2%th, stannous chloride 1-3%, citric acid 5-8%, methyl cellosolve 1-1.5, butyl cellosolve 1-1.5%, thiodiglycol 0.3-
0.5%th, polyglycereol 0.2-0.6%, Polyethylene Glycol 2-6%, corrosion inhibiter 0.05-0.12%, chelating agen 0.01-0.03%, emulsifying
Agent 0.2-0.3%, balance of distilled water.
4. a kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section as claimed in claim 3, its feature exists
In the corrosion inhibiter is mercaptobenzothiazoler.
5. a kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section as claimed in claim 3, its feature exists
In the chelating agen is sodium versenate or tetrasodium ethylenediamine tetraacetate.
6. a kind of controlled rolling and controlled cooling and clod wash comprehensive shaping method of the U-shaped steel of variable cross-section as claimed in claim 3, its feature exists
In the emulsifying agent is alkoxide cyclohexanedimethanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610525197.XA CN106180460B (en) | 2016-07-05 | 2016-07-05 | Controlled rolling, controlled cooling and cold bending comprehensive forming method for variable-section U-shaped steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610525197.XA CN106180460B (en) | 2016-07-05 | 2016-07-05 | Controlled rolling, controlled cooling and cold bending comprehensive forming method for variable-section U-shaped steel |
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| CN106180460B true CN106180460B (en) | 2017-05-17 |
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| CN107570622B (en) * | 2017-09-20 | 2023-11-17 | 江苏同力日升机械股份有限公司 | Emergency guide rail and bending forming method thereof |
| CN110116294A (en) * | 2018-02-06 | 2019-08-13 | 朱进军 | Steel structure wall moulding process and its U-shaped steel molding machine |
| CN114570800B (en) * | 2022-04-07 | 2024-05-17 | 南京图信新材料科技有限公司 | Cold rolling forming machine and U-shaped suspension arm plate production and manufacturing method |
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| JPS6250024A (en) * | 1985-08-29 | 1987-03-04 | Natl House Ind Co Ltd | Production of lightweight shape steel |
| JP4714425B2 (en) * | 2004-04-26 | 2011-06-29 | 株式会社タナック | Manufacturing method of long member and manufacturing apparatus used therefor |
| CN101954396B (en) * | 2010-05-31 | 2011-12-14 | 南京万汇新材料科技有限公司 | Roll type continuous cold-bending forming fabricating method for U-shaped steel sheet pile |
| CN102672014B (en) * | 2012-05-05 | 2014-03-26 | 北京科技大学 | Method for producing cold-formed steel of U-shaped davit arm |
| CN102926320B (en) * | 2012-11-19 | 2015-08-12 | 武汉钢铁(集团)公司 | The U-shaped ribs of bridge variable cross-section hot rolling and production technology thereof |
| CN204620900U (en) * | 2015-05-05 | 2015-09-09 | 北京科技大学 | The U-shaped rib hot-rolling pressing formation device of a kind of bridge |
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