CN104249090A - Ultrahigh-strength precise rectangular tube forming method and device - Google Patents
Ultrahigh-strength precise rectangular tube forming method and device Download PDFInfo
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- CN104249090A CN104249090A CN201410477990.8A CN201410477990A CN104249090A CN 104249090 A CN104249090 A CN 104249090A CN 201410477990 A CN201410477990 A CN 201410477990A CN 104249090 A CN104249090 A CN 104249090A
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Abstract
The invention provides an ultrahigh-strength precise rectangular tube forming method and an ultrahigh-strength precise rectangular tube forming device. The ultrahigh-strength precise rectangular tube forming method sequentially comprises the following steps: 1, selecting a preformed rectangular tube with a large fillet radius, and locally heating four fillets of the preformed rectangular tube to reach a preset temperature by using a heating fixture; 2, rolling the preformed rectangular tube heated to the preset temperature into a prefinished rectangular tube with a small fillet radius through a first finishing hole pattern roll bending process; 3, rolling the prefinished rectangular tube into a nearly sharp-angled precise rectangular tube through a second finishing hole pattern roll bending process. Compared with the conventional roll bending forming process, the hot roll bending forming technology provided by the invention concentrates on application of high-strength steel or ultrahigh-strength steel and has obvious technical leading advantages and a wide application range; compared with hot stamping, the hot roll bending forming process is high in forming speed, high in utilization ratio of materials and good in formability; through the ultrahigh-strength precise rectangular tube forming method, the nearly sharp-angled precise rectangular tube can be produced; the ultrahigh-strength precise rectangular tube forming device is good in performance.
Description
Technical field
The present invention relates to local heat roll bending formation technical field, refer to the accurate rectangular tube forming method of a kind of superhigh intensity and device especially.
Background technology
For meeting the automotive light weight technology of increasingly stringent, collision safety performance and toxic emission quantitative limitation requirement, except utilizing lightweighting materials such as Al, Mg and polymer, unimach application is in the automotive industry also more and more extensive.In the manufacture of mainstream automotive vehicle body abroad, substitute with unimach the direction that conventional strength steel is the development of Hyundai Motor parts.
For automobile main components-rectangular tube, in its main preparation technology, roll bending formation technique has higher forming ability and advantage, its speed of production is fast, cost is low, stock utilization is high, for the structural member of some shaped steel of remaining silent, roll bending formation technique has the irreplaceable advantage of other techniques.But unimach at normal temperatures yield strength is high, required roll bending formation power is comparatively large, requires high to the forming ability of roll bending equipment; Its springback capacity is comparatively large, and the dimensional accuracy of product is difficult to ensure; Simultaneously its yield tensile ratio is high, and namely shaping interval is relatively little, especially accurate rectangular tube small fillet radius shaping, is easy to produce cracking.So adopt the accurate rectangular tube of conventional roll roll forming explained hereafter superhigh intensity almost cannot complete.
Summary of the invention
The technical problem to be solved in the present invention is to provide the accurate rectangular tube forming method of a kind of superhigh intensity and device, cannot the problem of the accurate rectangular tube of production superhigh intensity with the roll bending formation technique solving prior art.
In order to solve the problem, the embodiment of the present invention proposes the accurate rectangular tube forming method of a kind of superhigh intensity, comprises the following steps successively:
Step one, gets the preformed rectangular tube of Rouno Cormer Pregrinding Wheel radius, is locally heated to preset temperature by heating tool to its four fillet positions;
Step 2, carries out the pre-finishing rectangular tube that first final polishing pass roll bending operation is rolled into small fillet radius by the preformed rectangular tube being heated to preset temperature;
Step 3, carries out the accurate rectangular tube that second final polishing pass roll bending operation is rolled into nearly wedge angle by pre-finishing rectangular tube.
Wherein, in step one, described preset temperature is 600 DEG C-950 DEG C.
Wherein, described first roll bending machine 1-5mm larger than the roller footpath of described second roll bending machine.
Wherein, in step one, described heating tool comprises a load coil, and described induction coil is that round is located on the outer border of rectangular tube, and is provided with to the close proximity structure in fillet position at four fillet positions of corresponding rectangular tube.
For solving the problems of the technologies described above, the embodiment of the present invention also provides a kind of superhigh intensity accurate rectangular pipe molding device of pipe, comprise spaced first roll bending machine and the second roll bending machine, described first roll bending machine is provided with temperature measurer and automatic feedback system, induction coil is provided with before described first roll bending machine, described induction coil connects eddy-current heating switch board and automatic feedback system respectively, and described automatic feedback system compares the temperature of preset temperature and temperature measurer and automatically controls induction coil by eddy-current heating switch board and heat rectangular tube.
Wherein, described induction coil is that round is located on the outer border of rectangular tube, and is provided with to the close proximity structure in fillet position at four fillet positions of corresponding rectangular tube.
Wherein, also comprise multiple guide roller, in order to lead to rectangular tube.
Wherein, also comprise a cooling device, after being located at the second roll bending machine, in order to cool to rectangular tube.
The beneficial effect of technique scheme of the present invention is as follows:
(1) compared with conventional roll roll forming technique, hot roll bending forming technique of the present invention is absorbed in the application of high strength steel or unimach, has obvious technological precedence advantage and range of application widely; Compared with drop stamping, hot roll bending moulding process molding rate is fast, stock utilization is high and processability good; Hot roll bending moulding process reduces the requirement to equipment, extends the life-span of equipment.
(2) local induction heating technology of the present invention accurately can not only realize the heating at fillet position, reduces residual stress, prevents work hardening, and almost do not affect all the other mother metals, ensure raw-material intensity; Relative to entirety heating, local heat technology firing rate is fast, and the thermal efficiency is high, and cost is low.
(3) the present invention introduces thermal straightening system, and Appropriate application waste heat reduces aligning tension force, eliminates the turks-head roll in conventional roll roll forming technique, reduces costs, improve product size precision.
Accompanying drawing explanation
Fig. 1 is the structural representation of the accurate rectangular pipe molding device of pipe of superhigh intensity of the embodiment of the present invention;
Fig. 2 is the comparison diagram of the preformed rectangular tube of the embodiment of the present invention, pre-finishing rectangular tube and accurate rectangular tube;
Fig. 3 is the hot-trimming Levelling principle schematic diagram of the embodiment of the present invention;
Fig. 4 a is the structural representation one of the heating tool of the embodiment of the present invention;
Fig. 4 b is the structural representation two of the heating tool of the embodiment of the present invention.
[main element symbol description]
1: eddy-current heating switch board;
2: the first roll bending machines;
3: rectangular tube;
4: top and bottom rolls and side roller;
5: the second roll bending machines;
6: guide roller;
7: cooling device;
8: automatic feedback system;
9: induction coil.
Detailed description of the invention:
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The roll bending formation technique that the present invention is directed to prior art cannot the problem of the accurate rectangular tube of production superhigh intensity, provides the accurate rectangular tube forming method of a kind of superhigh intensity and device.
As shown in Figure 2, the accurate rectangular tube forming method of a kind of superhigh intensity that the embodiment of the present invention provides, comprises the following steps successively:
Step one, by traditional cold bending process, hypervelocity steel plate material is pre-bent to the larger rectangular tube of radius of corner, get the preformed rectangular tube of Rouno Cormer Pregrinding Wheel radius, by heating tool, preset temperature is locally heated to its four fillet positions, described preset temperature is 600 DEG C-950 DEG C, described heating tool comprises a load coil, and described induction coil is that round is located on the outer border of rectangular tube, and is provided with to the close proximity structure in fillet position at four fillet positions of corresponding rectangular tube;
Step 2, carries out the pre-finishing rectangular tube that first final polishing pass roll bending operation is rolled into small fillet radius by the preformed rectangular tube being heated to preset temperature;
Step 3, carries out the accurate rectangular tube that second final polishing pass roll bending operation is rolled into nearly wedge angle by pre-finishing rectangular tube;
First roll bending machine of described first final polishing pass roll bending operation and the second roll bending machine interval of described second final polishing pass roll bending operation are arranged, described first roll bending machine 1-5mm larger than the roller footpath of described second roll bending machine.
As shown in Figure 1, for solving the problems of the technologies described above, the embodiment of the present invention also provides a kind of superhigh intensity accurate rectangular pipe molding device of pipe, comprise spaced first roll bending machine 2 and the second roll bending machine 5, described first roll bending machine 2 is provided with temperature measurer and automatic feedback system 8, induction coil 9 is provided with before described first roll bending machine 2, described induction coil 9 connects eddy-current heating switch board 1 and automatic feedback system respectively, and described automatic feedback system compares the temperature of preset temperature and temperature measurer and automatically controls induction coil 9 pairs of rectangular tubes 3 by eddy-current heating switch board 1 and heat; Also comprise multiple guide roller 6, in order to lead to rectangular tube 3; Also comprise a cooling device 7, after being located at the second roll bending machine 5, in order to cool to rectangular tube 3.
Described first roll bending machine and the second roll bending machine are all made up of top and bottom rolls and side roller 4.
As shown in figures 4 a and 4b, described induction coil 9 is located on the outer border of rectangular tube 3 in round, and is provided with to the close proximity structure in fillet position at corresponding rectangular tube 3 four fillet positions.
The present invention first frame is that preformed rectangular tube is delivered into induction coil stably, prevents preformed rectangular tube from contacting with induction coil, forms short circuit; Then enter the induction coil refered in particular to, four fillet positions of rectangular tube are heated to predetermined temperature, ensure the constant of heating-up temperature by temperature measurer and automatic feedback system; Enter finished roll again, rectangular tube is subject to four-way extruding force, and because fillet is subject to the impact of temperature, yield strength is lower than the mother metal of not temperature influence, and extruding force is delivered to corner, and moulding deformation occurs, and radius of corner reduces; Fillet, after large deformation, is often subject to residual stress heterogeneous, causes the redundancy distortion such as distortion, lateral bending, buckling.As shown in Figure 3, the invention provides a kind of hot tensile strength straightening system, its principle is, utilize the speed difference that the difference of the roller footpath between two passages causes, certain tension force effect is produced between two passages, again in conjunction with the waste heat after hot-trimming, make to be subject at rectangular tube two ends higher than material yield strength, hot tensile strength effect lower than Tensile strength, thus eliminate the redundancy deformation such as the distortion after hot-trimming, warpage.
In local induction heating system of the present invention, make specific induction coil by oneself by this invention, accurately can heat four fillet positions of rectangular tube, and it is unaffected to avoid other plane mother metals.Also be configured with automatic feedback humidity control system, this system, by temperature measuring set, catches shaping front temperature feedback to heating system, if record temperature in forming temperature interval, then keeps current power; If do not exist, then rising or reduction power regulate applicable forming temperature rapidly, thus ensure the constant of heating-up temperature.
Embodiment one
1) ultrahigh-strength steel plates is pre-bent to the preformed rectangular tube of radius of corner R=8, size 40.0 × 40.0 × 2.0mm; 2) with feed speed 10m/min, preformed rectangular tube fillet position is heated to rapidly 600 DEG C; 3) after hot extrusion, finishing aligning, obtain and be of a size of the accurate rectangular tube that 38.5 × 38.5 × 2.0mm, radius of corner R=4.0 and dimensional accuracy are 0.1mm.Through quality testing, this accurate rectangular tube work hardening phenomenon alleviates, and residual stress reduces, and percentage elongation is improved.
Embodiment 2
1) ultrahigh-strength steel plates is pre-bent to the preformed rectangular tube of radius of corner R=8, size 40.0 × 40.0 × 2.0mm; 2) with feed speed 15m/min, preformed rectangular tube fillet position is heated to rapidly 650 DEG C; 3) after hot extrusion, finishing aligning, obtain and be of a size of the accurate rectangular tube that 38.0 × 38.0 × 2.0mm, radius of corner R=2.0 and dimensional accuracy are 0.1mm.Through quality testing, this accurate rectangular tube work hardening phenomenon alleviates, and residual stress reduces, and percentage elongation is improved.
The beneficial effect of technique scheme of the present invention is as follows:
(1) compared with conventional roll roll forming technique, hot roll bending forming technique of the present invention is absorbed in the application of high strength steel or unimach, has obvious technological precedence advantage and range of application widely; Compared with drop stamping, hot roll bending moulding process molding rate is fast, stock utilization is high and processability good; Hot roll bending moulding process reduces the requirement to equipment, extends the life-span of equipment.
(2) local induction heating technology of the present invention accurately can not only realize the heating at fillet position, reduces residual stress, prevents work hardening, and almost do not affect all the other mother metals, ensure raw-material intensity; Relative to entirety heating, local heat technology firing rate is fast, and the thermal efficiency is high, and cost is low.
(3) the present invention introduces thermal straightening system, and Appropriate application waste heat reduces aligning tension force, eliminates the turks-head roll in conventional roll roll forming technique, reduces costs, improve product size precision.
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 (8)
1. the accurate rectangular tube forming method of superhigh intensity, is characterized in that, comprise the following steps successively:
Step one, gets the preformed rectangular tube of Rouno Cormer Pregrinding Wheel radius, is locally heated to preset temperature by heating tool to its four fillet positions;
Step 2, carries out the pre-finishing rectangular tube that first final polishing pass roll bending operation is rolled into small fillet radius by the preformed rectangular tube being heated to preset temperature;
Step 3, carries out the accurate rectangular tube that second final polishing pass roll bending operation is rolled into nearly wedge angle by pre-finishing rectangular tube.
2. the accurate rectangular tube forming method of superhigh intensity according to claim 1, it is characterized in that, in step one, described preset temperature is 600 DEG C-950 DEG C.
3. the accurate rectangular tube forming method of superhigh intensity according to claim 1, is characterized in that, described first roll bending machine 1-5mm larger than the roller footpath of described second roll bending machine.
4. the accurate rectangular tube forming method of superhigh intensity according to claim 1, it is characterized in that, in step, described heating tool comprises a load coil, described induction coil is that round is located on the outer border of rectangular tube, and is provided with to the close proximity structure in fillet position at four fillet positions of corresponding rectangular tube.
5. the accurate rectangular pipe molding device of pipe of superhigh intensity, it is characterized in that, comprise spaced first roll bending machine and the second roll bending machine, described first roll bending machine is provided with temperature measurer and automatic feedback system, induction coil is provided with before described first roll bending machine, described induction coil connects eddy-current heating switch board and automatic feedback system respectively, and described automatic feedback system compares the temperature of preset temperature and temperature measurer and automatically controls induction coil by eddy-current heating switch board and heat rectangular tube.
6. the accurate rectangular pipe molding device of pipe of superhigh intensity according to claim 5, is characterized in that, described induction coil is that round is located on the outer border of rectangular tube, and is provided with to the close proximity structure in fillet position at four fillet positions of corresponding rectangular tube.
7. the accurate rectangular pipe molding device of pipe of superhigh intensity according to claim 5, is characterized in that, also comprise multiple guide roller, in order to lead to rectangular tube.
8. the accurate rectangular pipe molding device of pipe of superhigh intensity according to claim 5, is characterized in that, also comprise a cooling device, after being located at the second roll bending machine, in order to cool to rectangular tube.
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|---|---|---|---|
| CN201410477990.8A CN104249090B (en) | 2014-09-18 | 2014-09-18 | A kind of superhigh intensity precision rectangular tube forming method and device |
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| CN201410477990.8A CN104249090B (en) | 2014-09-18 | 2014-09-18 | A kind of superhigh intensity precision rectangular tube forming method and device |
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| CN104249090A true CN104249090A (en) | 2014-12-31 |
| CN104249090B CN104249090B (en) | 2016-12-07 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971959A (en) * | 2015-07-23 | 2015-10-14 | 上海宝钢型钢有限公司 | High-strength closed sectional material hot roll forming process |
| CN105107866A (en) * | 2015-07-23 | 2015-12-02 | 上海宝钢型钢有限公司 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
| CN106270218A (en) * | 2016-11-01 | 2017-01-04 | 哈尔滨工业大学（威海） | A kind of online controllable continuous based on Multi-sensor Fusion is from hindering method for heating and controlling |
| CN107185997A (en) * | 2017-07-05 | 2017-09-22 | 宁波钜智自动化装备有限公司 | A kind of multiple-axis servo controls high accuracy ERW skelper structures |
| CN108607880A (en) * | 2018-05-18 | 2018-10-02 | 石家庄轴设机电设备有限公司 | Square rectangle wedge angle pipe hot forming production line |
| CN110000239A (en) * | 2019-04-09 | 2019-07-12 | 天津天重中直科技工程有限公司 | A kind of novel circle change side's shaping machine set |
| WO2020015557A1 (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 steel pipe and preparation method therefor |
| 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 |
| 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 |
| CN114798818A (en) * | 2022-04-02 | 2022-07-29 | 江苏赐瑞金属制品有限公司 | Automatic straightening machine and automatic straightening method for galvanized square tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105107866A (en) * | 2015-07-23 | 2015-12-02 | 上海宝钢型钢有限公司 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
| CN104971959A (en) * | 2015-07-23 | 2015-10-14 | 上海宝钢型钢有限公司 | High-strength closed sectional material hot roll forming process |
| CN106270218A (en) * | 2016-11-01 | 2017-01-04 | 哈尔滨工业大学（威海） | A kind of online controllable continuous based on Multi-sensor Fusion is from hindering method for heating and controlling |
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| CN107185997B (en) * | 2017-07-05 | 2019-09-17 | 宁波钜智自动化装备有限公司 | A kind of multiple-axis servo control high-precision ERW skelper structure |
| CN107185997A (en) * | 2017-07-05 | 2017-09-22 | 宁波钜智自动化装备有限公司 | A kind of multiple-axis servo controls high accuracy ERW skelper structures |
| CN108607880A (en) * | 2018-05-18 | 2018-10-02 | 石家庄轴设机电设备有限公司 | Square rectangle wedge angle pipe hot forming production line |
| WO2020015557A1 (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 steel pipe and preparation method therefor |
| 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 |
| AU2019305746B2 (en) * | 2018-07-17 | 2022-09-01 | Sino Institute of Precise Tubes Industry (Guangzhou) Co.Ltd. | Corner-thickened cold/hot composite formation square/rectangular pipe forming system |
| US11618066B2 (en) | 2018-07-17 | 2023-04-04 | Sino Institute of Precise Tubes Industry (Guangzhou) Co., Ltd. | Hot and cold composite formed square and rectangular steel tube with thickened corners and production method |
| CN110000239A (en) * | 2019-04-09 | 2019-07-12 | 天津天重中直科技工程有限公司 | A kind of novel circle change side's shaping machine set |
| 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 |
| CN114798818A (en) * | 2022-04-02 | 2022-07-29 | 江苏赐瑞金属制品有限公司 | Automatic straightening machine and automatic straightening method for galvanized square tubes |
| CN114798818B (en) * | 2022-04-02 | 2023-09-08 | 江苏赐瑞金属制品有限公司 | Automatic straightener and automatic straightening method for galvanized square pipes |
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