CN104971959A - High-strength closed sectional material hot roll forming process - Google Patents
High-strength closed sectional material hot roll forming process Download PDFInfo
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- CN104971959A CN104971959A CN201510437274.1A CN201510437274A CN104971959A CN 104971959 A CN104971959 A CN 104971959A CN 201510437274 A CN201510437274 A CN 201510437274A CN 104971959 A CN104971959 A CN 104971959A
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- strength
- strength steel
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
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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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- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A high-strength closed sectional material hot roll forming process comprises the following steps that firstly, a high-strength steel plate is uncoiled and flattened; secondly, the flattened high-strength steel plate is fed into a linear inductor heater, and a first corner of the plate is subjected to local and linear heating, wherein the heating temperature ranges from 650 DEG C to 950 DEG C; thirdly, a roll forming unit is used for conducting roll forming on the first corner of the heated plate to reach a required bent angle; fourthly, other corners of the plate are subjected to local and linear heating and roll forming, welding, waste heat straightening, cooling, acid pickling and fixed-length cutting are conducted, and then small-diameter rounded closed rolled steel is obtained. According to the process, the corners of the plate are subjected to local and linear heating, local linear heating of deformed regions is achieved, and non-deformed regions are not affected; high-strength steel is small in resilience, the small-diameter rounded closed rolled steel can be obtained, the internal stress of the rounded corners is small, and the toughness and ductility of the rounded corners are improved.
Description
Technical field
The present invention relates to a kind of high strength opening-closed sectional material hot roll bending forming technology.
Background technology
Roll forming is the topmost production method of opening-closed sectional material, and it is high that roll forming technique has production efficiency, good product performance, can produce remain silent, the profile shapes of opening and multiple section, be easy to the advantages such as automated production; The opening-closed sectional material produced has that intensity is high, module of anti-bending section is large, be easy to assembling and the advantage such as stable, attractive in appearance, makes opening-closed sectional material building, Rail car manufacture industry is used widely.Especially along with the development of high-strength steel in recent years, small dimension opening-closed sectional material substitutes the trend that traditional parts are Hyundai Motor development.
High-strength steel at normal temperatures yield strength is high, and required roll forming power is comparatively large, requires high to the forming ability of roll bending equipment; Its springback capacity is large, and the dimensional accuracy of product is difficult to ensure; Its yield tensile ratio is high simultaneously, and namely shaping interval is relatively little, the shaping of especially accurate minor radius fillet opening-closed sectional material, is easy to produce cracking.Therefore, conventional roll o ing explained hereafter high-strength accurate closed end tube is adopted almost cannot to realize.
For solving the difficult problem that high-strength steel draw roll o ing technique is brought, Chinese patent 201110445968.1 discloses a kind of high-strength steel localized heat manufacturing process, but the method is combined with hot forming techniques by stamping technology, is not suitable for the production of opening-closed sectional material; Chinese patent 201220007161.X discloses a kind of device of electromagnetic induction heating roll forming tubing, but this device is to the heating of tubing entirety, and its hear rate is larger.
Summary of the invention
The object of the present invention is to provide a kind of high strength opening-closed sectional material hot roll bending forming technology, hot roll bending forming technology is adopted to form process to high-strength steel, realize the heating of deformed region local linear, improve the moulding deformation nature at bent angle position, produce energy consumption is low, good product performance, dimensional accuracy are high minor radius fillet to remain silent shaped steel, overcome the defect that conventional roll bending process cannot produce high-strength steel opening-closed sectional material, fill up the limitation that Sheet Metal Forming Technology is shaped to opening-closed sectional material simultaneously.
For achieving the above object, technical scheme of the present invention is:
A kind of high-strength steel opening-closed sectional material hot roll bending forming technology, comprises the following steps:
1) uncoiling, leveling
By the uncoiling of high-strength steel sheet material, then send into level(l)ing machine leveling; The yield strength of described high-strength steel sheet material is 600 ~ 1400MPa.
2) heat
High-strength steel sheet material is sent into linear response heater, and carry out local linear heating to the first corner of high-strength steel sheet material, heating-up temperature is 650 ~ 950 DEG C.
3) be shaped
By roll bending unit, roll forming is carried out to high-strength steel sheet material first corner after heating, reach the angle of bend required by product.
4) step 2 is repeated) and step 3), local linear heating is carried out to other corners of high-strength steel sheet material, then roll forming, hot roll bending carries out welding after being shaped, waste heat aligning, cooling, pickling, Length-fixing cutting, obtain minor radius fillet opening-closed sectional material.
Further, the thickness of described high-strength steel sheet material is 0.1 ~ 10mm.
Roller footpath difference in described forming process in last passage and waste heat straightening process between the first passage is 1 ~ 5mm.
Again, step 4) radius of corner of described minor radius fillet opening-closed sectional material be 0.1 ~ 2t, t is sheet metal thickness.
Preferably, when step 2) in heating-up temperature more than austenitizing temperature time, step 4) cooling time select water-cooled, all the other are air cooling.
The yield strength of high-strength steel sheet material of the present invention is 600 ~ 1400MPa, and its yield tensile ratio is higher, and non-deformability is comparatively strong, not easily plastic deformation occurs, and percentage elongation is lower, easily occurs crackle in plastically deforming area.The high-strength steel sheet metal thickness that the present invention is suitable for is 0.1 ~ 10mm.
The present invention carries out local linear heating by linear response heater to sheet material corner, realize the heating of deformed region local linear, and can ensure that non-deformed area is unaffected, and the power of induction heater is regulated by the temperature measuring equipment that is connected with linear response heater and reponse system thereof, ensure the constant of temperature.
Deformed region of the present invention is after local linear heating, and bight tissue becomes close, and crystal grain reduces, the dislocation brought due to large deformation is also replied, and eliminates work hardening, substantially improves the percentage elongation of bent angle, reduce the impact of residual stress, possibility is provided to the following process of opening-closed sectional material.And each corner of the present invention to sheet material is heated respectively, is out of shape, and greatly reduces shaping passage, reduces costs.
Heating temperature range of the present invention is 650 ~ 950 DEG C, the DeGrain that the too low stretching plastic to high-strength steel of temperature improves, and the too high meeting of temperature causes changes in microstructure and surface quality problems.
Described step 4) in, waste heat aligning is the speed difference produced by the roller footpath difference between shaping passage and aligning passage two passages, make opening-closed sectional material in forming process, be subject to certain tension force effect, and utilize the waste heat after being shaped, make to be subject at section bar two ends, higher than material yield strength, hot tensile strength effect lower than Tensile strength, to eliminate the deformation of the redundancy such as distortion, warpage.Therefore, the present invention controls the roller footpath difference in forming process in last passage and waste heat straightening process between the first passage is 1 ~ 5mm.
Through the mother metal of the yield strength of heated high strength steel plate deformed region lower than not temperature influence in the present invention, reduce the plastic force of roll bending equipment, improve the moulding deformation nature at bent angle position, minor radius fillet can be obtained and to remain silent shaped steel.
The present invention is on traditional closed type steel rider o ing crew base, with the addition of hot forming module (i.e. linear response heater, the temperature measuring equipment be connected with linear response heater and reponse system thereof regulate to be felt) and waste heat Levelling principle is proposed, namely each bent angle is before roll bending, local linear heating is carried out to its bight, increase deformed area moulding, and utilize waste heat, to its shaping, aligning.Wherein, waste heat be linear response heating, shaping finishing complete after heat, while hot-trimming, carry out thermal straightening in conjunction with next passage.
Beneficial effect of the present invention:
1. by linear response heater, the present invention ensures that the heating region of steel is linear distribution, realize the heating of deformed region local linear, avoid other edge mother metals unaffected, improve the moulding deformation nature at bent angle position, minor radius fillet can be obtained and to remain silent shaped steel; And this induction coil skin is wrapped up by silicon steel sheet, to reduce eddy current, thus reduce electric energy consume, firing rate is fast, and the thermal efficiency is high, and cost is low.
2. little through the high-strength steel resilience that linear response heater of the present invention is heat treated, decrease the frame number in conventional roll o ing technique, minor radius fillet can be obtained to remain silent shaped steel, and fillet place internal stress is little, toughness and ductility are improved, for the following process of high strength opening-closed sectional material provides possibility.
3. the present invention proposes waste heat Levelling principle, utilize the speed difference that the difference of the roller footpath between two passages causes, certain hot tensile strength effect is produced between two passages, make opening-closed sectional material in forming process, be subject to certain tension force effect, again in conjunction with the waste heat after thermal deformation, efficiently solve the redundancy such as distortion, warpage deformation after thermal deformation.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention.
Fig. 2 is the use schematic diagram of linear response heater of the present invention heating high-strength steel sheet.
Fig. 3 is the product schematic diagram after the embodiment of the present invention 1 hot roll bending.
Fig. 4 is the product schematic diagram after the embodiment of the present invention 2 hot roll bending.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
See Fig. 1, Fig. 2, high strength opening-closed sectional material hot roll bending forming technology of the present invention comprises the steps: 1) uncoiling, leveling: by uncoiler 1 by high-strength steel steel plate 2 to be processed uncoiling, and send into plate straightening roll 3 and carry out leveling.
2) heat, be out of shape: high-strength steel steel plate 2 is sent into linear response heater 5 by plate directive wheel subsequently, carry out the first corner local heat, as shown in Figure 2, on first corner 21 of high-strength steel steel plate 2, (or upper and lower both sides) establish linear response heater 5, induction coil skin is wrapped up by silicon steel sheet, to reduce eddy current, and ensure the constant of temperature by temperature measurer and automatic feedback system 4.Linear response heater is made up of copper pipe, and middle logical cooling fluid cooling, in order to reduce eddy current consume, skin is surrounded by silicon steel sheet, and its power frequency used can select power frequency, intermediate frequency or high frequency according to high-strength steel intensity, sheet thickness and forming speed.
Be heated to the high-strength steel sheet of preset temperature, thereupon by some frame roll bending units 6 to its roll forming, to reach specific angle of bend.
3) with above-mentioned steps 2), linear heat is carried out, then roll forming to second, third other corners such as grade; 4), after hot roll bending is shaped, enter welder 7 and weld, afterwards, by afer bay roll bending unit to its hot-stretch aligning, shaping, cut by sizing cutting device 8 after pickling, enter splicing platform 9.
Embodiment 1
For square tube (as shown in Figure 3), 980MS martensite cold rolled sheet steel selected by high-strength steel sheet material, through twice sublinear induction heater, roll bending frame only two passages needed for each bent angle is shaped, with feed speed 8m/min, design temperature is 650 DEG C, obtains the square tube of round radius R=2mm.
After testing, compared with conventional roll o ing technique, the outer surface bight circumference residual stress of embodiment 1 square tube drops to about-100MPa by original about-250MPa; After same thermal straightening, outer surface longitudinal residual stress becomes about 50MPa by original 200MPa.Cold bending process makes bight percentage elongation have dropped 57%, and the percentage elongation through high strength opening-closed sectional material bight prepared by hot bending process of the present invention is consistent with mother metal percentage elongation.
Embodiment 2
For Type B pipe (as shown in Figure 4), QSTE700 lower bainite hot-rolled sheet strip steel selected by high-strength steel sheet material, through four-pass linear response heater, roll bending frame only two passages needed for each bent angle is shaped, with feed speed 10m/min, design temperature is 600 DEG C, obtains the Type B pipe of round radius R=2mm.After testing, compared with conventional roll o ing technique, this Type B pipe work hardening phenomenon alleviates, and residual stress reduces, and percentage elongation is improved.
After testing, compared with conventional roll o ing technique, the outer surface bight circumference residual stress of the present embodiment 2B type pipe drops to about-40MPa by original-180MPa; After same thermal straightening, outer surface longitudinal residual stress becomes about 60MPa by original 220MPa.Cold bending process makes bight percentage elongation have dropped 45%, and the percentage elongation through high strength opening-closed sectional material bight prepared by hot bending process of the present invention is consistent with mother metal percentage elongation.
In summary, hot roll bending forming technology of the present invention makes the work hardening phenomenon of high strength opening-closed sectional material alleviate, and residual stress reduces, and percentage elongation obtains good improvement.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a high strength opening-closed sectional material hot roll bending forming technology, is characterized in that, comprise the steps:
1) uncoiling, leveling
By the uncoiling of high-strength steel sheet material, leveling;
2) heat
High-strength steel sheet material after leveling is sent into linear response heater, and carry out local linear heating to the first corner of high-strength steel sheet material, heating-up temperature is 650 ~ 950 DEG C;
3) be shaped
Carry out roll forming by first corner of roll bending unit to the high-strength steel sheet material after heating, reach the angle of bend required by product;
4) repeat step 2) and step 3), local linear heating is carried out to other corners of high-strength steel sheet material, then roll forming, hot roll bending carries out after being shaped welding, waste heat aligning, cooling, pickling, Length-fixing cutting, obtain minor radius fillet opening-closed sectional material;
Wherein, the yield strength of described high-strength steel sheet material is 600 ~ 1400MPa;
Roller footpath difference in described forming process in last passage and waste heat straightening process between the first passage is 1 ~ 5mm.
2. high strength opening-closed sectional material hot roll bending forming technology according to claim 1, is characterized in that, the thickness of described high-strength steel sheet material is 0.1 ~ 10mm.
3. high strength opening-closed sectional material hot roll bending forming technology according to claim 1, is characterized in that, the radius of corner of described minor radius fillet closed type steel is 0.1 ~ 2t, t is sheet metal thickness, unit: mm.
4. high strength opening-closed sectional material hot roll bending forming technology according to claim 1, is characterized in that, when step 2) in heating-up temperature more than austenitizing temperature time, step 4) cooling time select water-cooled, all the other are air cooling.
Priority Applications (1)
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| CN201510437274.1A CN104971959B (en) | 2015-07-23 | 2015-07-23 | A kind of high intensity opening-closed sectional material hot roll bending forming technology |
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| CN201510437274.1A CN104971959B (en) | 2015-07-23 | 2015-07-23 | A kind of high intensity opening-closed sectional material hot roll bending forming technology |
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| CN104971959A true CN104971959A (en) | 2015-10-14 |
| CN104971959B CN104971959B (en) | 2017-03-29 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107186025A (en) * | 2017-05-22 | 2017-09-22 | 杜佐仁 | A kind of mould and method for producing automobile meeting pedal supporting support |
| CN108555134A (en) * | 2018-07-04 | 2018-09-21 | 成都临建科技有限责任公司 | A kind of cold roll forming keel machine for the light steel processing of thin-walled |
| WO2020015555A1 (en) * | 2018-07-17 | 2020-01-23 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner-thickened cold/hot composite formation square/rectangular pipe forming system |
| CN110726064A (en) * | 2018-07-17 | 2020-01-24 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner thickened cold-hot composite molded square rectangular steel pipe and preparation method thereof |
| CN112872118A (en) * | 2020-12-18 | 2021-06-01 | 内蒙古大学 | Precision bending forming process of large-caliber straight welded pipe |
| CN113118232A (en) * | 2021-04-21 | 2021-07-16 | 中冶赛迪技术研究中心有限公司 | Closed-type steel hot roll bending production process |
| CN113118230A (en) * | 2021-04-21 | 2021-07-16 | 中冶赛迪技术研究中心有限公司 | Closed-type steel hot roll bending production composite process |
| CN114603040A (en) * | 2022-03-21 | 2022-06-10 | 成都东凯泽环保工程有限公司 | Flanging channel steel production device and flanging channel steel |
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| CN104249090A (en) * | 2014-09-18 | 2014-12-31 | 北京科技大学 | Ultrahigh-strength precise rectangular tube forming method and device |
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| JPS61193723A (en) * | 1985-02-25 | 1986-08-28 | Kawasaki Steel Corp | Production of angular pipe |
| JPH0399725A (en) * | 1989-09-09 | 1991-04-24 | Nakajima Kokan Kk | Roll forming method for large sized square steel pipe |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107186025A (en) * | 2017-05-22 | 2017-09-22 | 杜佐仁 | A kind of mould and method for producing automobile meeting pedal supporting support |
| CN108555134A (en) * | 2018-07-04 | 2018-09-21 | 成都临建科技有限责任公司 | A kind of cold roll forming keel machine for the light steel processing of thin-walled |
| CN108555134B (en) * | 2018-07-04 | 2023-12-15 | 成都临建科技有限责任公司 | Cold-formed keel machine for thin-wall light steel processing |
| WO2020015555A1 (en) * | 2018-07-17 | 2020-01-23 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner-thickened cold/hot composite formation square/rectangular pipe forming system |
| CN110726064A (en) * | 2018-07-17 | 2020-01-24 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner thickened cold-hot composite molded square rectangular steel pipe and preparation method thereof |
| CN112872118A (en) * | 2020-12-18 | 2021-06-01 | 内蒙古大学 | Precision bending forming process of large-caliber straight welded pipe |
| CN112872118B (en) * | 2020-12-18 | 2023-12-12 | 内蒙古大学 | Precise bending forming process of large-caliber straight welded pipe |
| CN113118232A (en) * | 2021-04-21 | 2021-07-16 | 中冶赛迪技术研究中心有限公司 | Closed-type steel hot roll bending production process |
| CN113118230A (en) * | 2021-04-21 | 2021-07-16 | 中冶赛迪技术研究中心有限公司 | Closed-type steel hot roll bending production composite process |
| CN114603040A (en) * | 2022-03-21 | 2022-06-10 | 成都东凯泽环保工程有限公司 | Flanging channel steel production device and flanging channel steel |
| CN114603040B (en) * | 2022-03-21 | 2023-10-03 | 青岛雷霆重工股份有限公司 | Flanging channel steel production device and flanging channel steel |
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