CN104400327B - The method of prefabricated Large Steel stoplog web camber - Google Patents
The method of prefabricated Large Steel stoplog web camber Download PDFInfo
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- CN104400327B CN104400327B CN201410524630.9A CN201410524630A CN104400327B CN 104400327 B CN104400327 B CN 104400327B CN 201410524630 A CN201410524630 A CN 201410524630A CN 104400327 B CN104400327 B CN 104400327B
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- web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
A kind of method of prefabricated Large Steel stoplog web camber is provided, first to upper web and lower web respectively in upper beam flange plate and lower beam flange plate side while carry out blanking by the ideal curve of prefabricated camber, upper web and lower web press straight line blanking respectively in upper beam superimposed sheet and underbeam superimposed sheet side; Then to upper web and lower web respectively in upper beam flange plate and lower beam flange plate side while carry out band shape heating, upper web and lower web produce compressive plastic deformation because of thermal stress, then make web and lower web respectively at the camber forming approximate ideal curve of upper beam superimposed sheet and underbeam superimposed sheet side; Finally utilize full-automatic vibration aging regime to carry out vibration to upper web and lower web and eliminate residual stress, ensure the stable of camber size.The present invention ensure that the flatness of stoplog superimposed sheet effectively, can be widely used in overcritical, ultra supercritical thermal power generation unit large-scale steel structure stoplog web camber prefabricating technique.
Description
Technical field
The invention belongs to Large Steel stoplog manufacturing technology field, be specifically related to a kind of method of prefabricated Large Steel stoplog web camber.
Background technology
In overcritical, ultra supercritical thermal power generation unit boiler steel structure, stoplog is the important component bearing boiler dynamic loading, is to be formed by connecting by upper and lower beam is superimposed.In stoplog manufactures, web prefabricated camber is a key technology, and it directly affects the making quality of stoplog and installs and uses performance.At present, in large-scale and ultra-large type stoplog manufacture process, due to huge structure, cutting technique or shape cutting technology cannot be adopted to carry out blanking prefabricated camber, but utilizing semi auto cutting machine, broken line cutting stock, completes the prefabricated of web camber, cause that superimposed sheet coxostermum edge after prefabricated camber is not round and smooth, irregularity like this, correction is large, and overproof after cannot correct, be difficult to effectively ensure superimposed sheet flatness, thus affect the total quality of stoplog, be therefore necessary to propose to improve.
Summary of the invention
The technical problem that the present invention solves: a kind of method that prefabricated Large Steel stoplog web camber is provided, first to web in flange plate side while carry out blanking by the ideal curve of prefabricated camber, web in superimposed sheet side while press straight line blanking, not prefabricated camber, then flame straightening principle is utilized, to web flange plate side while carry out band shape heating, web produces compressive plastic deformation because of thermal stress, then make web in superimposed sheet side while form the camber of approximate ideal curve, recycling full-automatic vibration aging regime carries out vibration to web and eliminates residual stress, to ensure the stable of camber size.
The technical solution used in the present invention: the method for prefabricated Large Steel stoplog web camber, comprises the steps:
1) first to upper web and lower web respectively in upper beam flange plate and lower beam flange plate side while carry out blanking by the ideal curve of prefabricated camber, upper web and lower web respectively in upper beam superimposed sheet and underbeam superimposed sheet side while press straight line blanking, not prefabricated camber;
2) flame straightening principle is utilized, to upper web and lower web respectively in upper beam flange plate and lower beam flange plate side while carry out band shape to be heated to 600 ~ 700 DEG C, upper web and lower web produce compressive plastic deformation because of thermal stress, then make web and lower web respectively at the camber forming approximate ideal curve of upper beam superimposed sheet and underbeam superimposed sheet side;
3) utilize full-automatic vibration aging regime to carry out vibration to upper web and lower web and eliminate residual stress, ensure the stable of camber size.
Above-mentioned steps 1) in, adopt semi auto cutting machine, replace arc curve to carry out cutting stock with the combination of shorter broken line, make the camber of described upper web be f1, the camber of described lower web is f2.
Above-mentioned steps 2) in, the belt-like heated region that width is 80 ~ 120mm is drawn to the upper web of well cutting and the curved edge of lower web, then many people are uniform is heated to require temperature to the banded thermal treatment zone with flame simultaneously, after naturally cooling, upper web and lower web produce compressive plastic deformation due to thermal stress, upper web and lower web respectively in upper beam superimposed sheet and underbeam superimposed sheet side while there is buckling deformation, upper web is at the span centre camber value f of upper beam flange plate side
1reduce, be changed to f
1＇; Lower web is at one side span centre camber value f of lower beam flange plate side
2increase, be changed to f
2＇; Upper web in upper beam superimposed sheet side while forming span centre camber value is f
3camber, wherein f
1=f
1＇+f
3, lower web is f in the formation span centre camber value of underbeam superimposed sheet side
4camber, wherein f
2=f
2＇-f
4, and upper web and lower web are f in the span centre camber value of upper beam superimposed sheet and underbeam superimposed sheet side respectively
3and f
4camber curve be similar to ideal curve, camber is round and smooth, do not need revise.
Above-mentioned steps 3) in, upper web and lower web support 4 rubber blankets respectively, the strong point of rubber blanket be located at apart from upper web or lower web end distance be 2L/9 place, wherein L is the horizontal support length of upper web and lower web, near the crest at upper web or edge, lower web side and the vibrator that is installed in two rubber blanket centre positions, near the crest at upper web or lower web opposite side edge and two rubber blanket centre positions install vibration pickups on web or lower web carry out vibration elimination residual stress.
The web prefabricated camber edge transition of the stoplog superimposed sheet side that the present invention compared with prior art produces is round and smooth, bright and clean, be similar to desirable camber curve, thus effectively ensure superimposed sheet flatness, can be widely used in surpassing, in ultra supercritical coal-fired unit steel stoplog web camber prefabricating technique, there is higher practical value.
Accompanying drawing explanation
Fig. 1 is steel stoplog structural representation of the present invention;
Fig. 2 is structure chart after upper web of the present invention and lower web blanking;
Fig. 3 is upper web of the present invention and lower web heating region schematic diagram;
Fig. 4 is upper web of the present invention and the rear opposite side prefabricated camber structural representation of lower web heating;
Fig. 5 is upper web Relieving Residual Stress in Libration structural front view of the present invention;
Fig. 6 is upper web Relieving Residual Stress in Libration structure top view of the present invention;
Fig. 7 is lower web Relieving Residual Stress in Libration structural front view of the present invention;
Fig. 8 is lower web Relieving Residual Stress in Libration structure top view of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-7, a kind of embodiment of the present invention is described.
The method of prefabricated Large Steel stoplog web camber, comprises the steps:
1, first to upper web 2 and lower web 5 respectively in upper beam flange plate 1 and lower beam flange plate 4 side while carry out blanking by the ideal curve of prefabricated camber, upper web 2 and lower web 5 respectively in upper beam superimposed sheet 3 and underbeam superimposed sheet 6 side while press straight line blanking, not prefabricated camber; Specifically, adopt semi auto cutting machine, replace arc curve to carry out cutting stock with the combination of shorter broken line, make the camber of described upper web 2 be f1, the camber of described lower web 5 is f2;
2, flame straightening principle is utilized, to upper web 2 and lower web 5 respectively in upper beam flange plate 1 and lower beam flange plate 4 side while carry out band shape to be heated to 600 ~ 700 DEG C, upper web 2 and lower web 5 produce compressive plastic deformation because of thermal stress, then make web 2 and lower web 5 respectively at the camber forming approximate ideal curve of upper beam superimposed sheet 3 and underbeam superimposed sheet 6 side, specifically, different according to web thickness, the belt-like heated region (dash area as shown in Figure 3) that width is 80 ~ 120mm is drawn to the upper web 2 of well cutting and the curved edge of lower web 5, then many people are uniform is heated to require temperature to the banded thermal treatment zone with flame simultaneously, after naturally cooling, upper web 2 and lower web 5 are due to thermal stress generation compressive plastic deformation, upper web 2 and lower web 5 respectively in upper beam superimposed sheet 3 and underbeam superimposed sheet 6 side while there is buckling deformation, upper web 2 is at one side span centre camber value f of upper beam flange plate 1 side
1reduce, be changed to f
1＇, lower web 5 is at one side span centre camber value f of lower beam flange plate 4 side
2increase, be changed to f
2＇, upper web 2 in upper beam superimposed sheet 3 side while forming span centre camber value is f
3camber, wherein f
1=f
1＇+f
3, lower web 5 is f in the formation span centre camber value of underbeam superimposed sheet 6 side
4camber, wherein f
2=f
2＇-f
4, and upper web 2 and lower web 5 are f in the span centre camber value of upper beam superimposed sheet 3 and underbeam superimposed sheet 6 side respectively
3and f
4camber curve be similar to ideal curve, camber is round and smooth, do not need revise.
3, utilize full-automatic vibration aging regime to carry out vibration to upper web 2 and lower web 5 and eliminate residual stress, ensure the stable of camber size.Specifically, upper web 2 and lower web 5 support 4 rubber blankets 8 respectively, the strong point of rubber blanket 8 be located at apart from upper web 2 or lower web 5 end distance be 2L/9 place, wherein L is the horizontal support length of upper web 2 and lower web 5, near the crest of upper web 2 or lower web 5 one lateral edges and the vibrator 9 that is installed in two rubber blanket 8 centre positions, near the crest at upper web 2 or lower web 5 opposite side edge and two rubber blanket 8 centre positions install vibration pickups 10 on web 2 or lower web 5 carry out vibration elimination residual stress.
Adopt the present invention, can effectively solve with the direct blanking of arch camber broken line prefabricated stoplog web camber, cause that web blanking edge is not round and smooth, correction is large, the ropy problem of stoplog superimposed sheet plane, effectively ensure that the flatness of stoplog superimposed sheet, improve work efficiency, save energy consumption, can be widely used in, in overcritical, ultra supercritical thermal power generation unit large-scale steel structure stoplog web camber prefabricating technique, there is good economic benefit, social benefit.
Above-described embodiment, just preferred embodiment of the present invention, is not used for limiting the scope of the present invention, therefore all equivalence changes done with content described in the claims in the present invention, all should be included within the claims in the present invention scope.
Claims (4)
1. the method for prefabricated Large Steel stoplog web camber, is characterized in that comprising the steps:
1) first to upper web (2) and lower web (5) respectively in upper beam flange plate (1) and lower beam flange plate (4) side while carry out blanking by the ideal curve of prefabricated camber, upper web (2) and lower web (5) respectively in upper beam superimposed sheet (3) and underbeam superimposed sheet (6) side while press straight line blanking, not prefabricated camber;
2) flame straightening principle is utilized, to upper web (2) and lower web (5) respectively in upper beam flange plate (1) and lower beam flange plate (4) side while carry out band shape to be heated to 600 ~ 700 DEG C, upper web (2) and lower web (5) produce compressive plastic deformation because of thermal stress, then make the camber of web (2) and lower web (5) the formation approximate ideal curve respectively in upper beam superimposed sheet (3) and underbeam superimposed sheet (6) side;
3) utilize full-automatic vibration aging regime to carry out vibration to upper web (2) and lower web (5) and eliminate residual stress, ensure the stable of camber size.
2. the method for prefabricated Large Steel stoplog web camber according to claim 1, it is characterized in that: above-mentioned steps 1) in, adopt semi auto cutting machine, arc curve is replaced to carry out cutting stock with the combination of shorter broken line, the camber making described upper web (2) is f1, and the camber of described lower web (5) is f2.
3. the method for prefabricated Large Steel stoplog web camber according to claim 1, it is characterized in that: above-mentioned steps 2) in, the belt-like heated region that width is 80 ~ 120mm is drawn to the upper web (2) of well cutting and the curved edge of lower web (5), then many people are uniform is heated to require temperature to the banded thermal treatment zone with flame simultaneously, after naturally cooling, upper web (2) and lower web (5) are due to thermal stress generation compressive plastic deformation, upper web (2) and lower web (5) respectively in upper beam superimposed sheet (3) and underbeam superimposed sheet (6) side while there is buckling deformation, upper web (2) is at one side span centre camber value f of upper beam flange plate (1) side
1reduce, be changed to f
1＇, lower web (5) is at one side span centre camber value f of lower beam flange plate (4) side
2increase, be changed to f
2＇, upper web (2) in upper beam superimposed sheet (3) side while forming span centre camber value is f
3camber, wherein f
1=f
1＇+f
3, lower web (5) is f in the formation span centre camber value of underbeam superimposed sheet (6) side
4camber, wherein f
2=f
2＇-f
4, and upper web (2) and lower web (5) they are f in the span centre camber value of upper beam superimposed sheet (3) and underbeam superimposed sheet (6) side respectively
3and f
4camber curve be similar to ideal curve, camber is round and smooth, do not need revise.
4. the method for prefabricated Large Steel stoplog web camber according to claim 1, it is characterized in that: above-mentioned steps 3) in, upper web (2) and lower web (5) support 4 rubber blankets (8) respectively, the strong point of rubber blanket (8) be located at apart from upper web (2) or lower web (5) end distance be 2L/9 place, wherein L is the horizontal support length of upper web (2) and lower web (5), near the crest of upper web (2) or lower web (5) lateral edges and the vibrator (9) that is installed in two rubber blankets (8) centre position, vibration pickup (10) is installed near the crest at upper web (2) or lower web (5) opposite side edge and in two rubber blankets (8) centre position vibration elimination residual stress is carried out to upper web (2) or lower web (5).
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|---|---|---|---|
| CN201410524630.9A CN104400327B (en) | 2014-10-08 | 2014-10-08 | The method of prefabricated Large Steel stoplog web camber |
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|---|---|---|---|
| CN201410524630.9A CN104400327B (en) | 2014-10-08 | 2014-10-08 | The method of prefabricated Large Steel stoplog web camber |
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| CN104400327B true CN104400327B (en) | 2016-04-06 |
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| CN106760057B (en) * | 2016-12-05 | 2019-03-19 | 西南科技大学 | Light gauge cold-formed steel shape house inner wall interlayer strengthening part |
| CN109590675B (en) * | 2018-10-30 | 2021-01-19 | 上海建工（江苏）钢结构有限公司 | Method for manufacturing steel frame overlapped type large plate beam of tower boiler |
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