CN101691186B - Production process of high-rigidity prestressed crane girder - Google Patents
Production process of high-rigidity prestressed crane girder Download PDFInfo
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- CN101691186B CN101691186B CN200910019315XA CN200910019315A CN101691186B CN 101691186 B CN101691186 B CN 101691186B CN 200910019315X A CN200910019315X A CN 200910019315XA CN 200910019315 A CN200910019315 A CN 200910019315A CN 101691186 B CN101691186 B CN 101691186B
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Abstract
The invention relates to a production process of a crane girder, comprising the following steps: blanking: obtaining a lateral board, an upper cover board, a lower cover board and a reinforcing board through cutting by cutting tools; lateral board cambering and reinforcing: placing the lateral board on a chopping board, using an impact machine to strike the center of the vertical height of the lateral board under an assembly state with appropriate strength and strike distance in sequence along the S/3 range of the midspan in the horizontal direction along the upper side of the lateral board, the strike width being 1/4 of the lateral board total height under the assembly state; hammering and processing the both sides in the same way until the camber requirement is met; upper and lower cover board hammering and reinforcing: placing the upper and lower cover boards on the chopping board respectively, using the impact machine to strike the S/3 range of the midspans of the upper and lower cover boards in the horizontal direction with appropriate strength and strike distance, and hammering and reinforcing the both sides of the upper and lower cover boards in the same way; and installing and welding the processed side board, uppercover board, lower cover board and reinforcing board into a box girder. The girder produced by the process has supernormal rigidity and long service life.
Description
Technical field:
The present invention relates to a kind of production technology of crane girder.
Background technology:
At present, gate-type, bridging crane main beam, the GB regulation all has 0.9～1.4S/1000 camber.The purpose of arch camber is to improve the bending strength of girder, prolongs the service life of girder.Different arch camber modes can produce different mechanics influences to the mechanical property of girder.
The standard arch camber mode of girder (is example with the box girder) is: at first rule with the calibrated curve model on flank listrium woolen cloth, again with plasma or machine cuts blanking, i.e. just have the standard camber after the side plate blanking.The maximum characteristics of blanking are that the rigidity and the mechanical property of the girder after being shaped is without prejudice like this, can be called accurate rigidity girder.Its weakness be take a lot of work, time-consuming, expense material.
Another kind of arch camber mode is: with the side plate blanking is straight plate, after the typing of girder assembly welding, utilizes metal to expand with heat and contract with cold characteristic with the flame heat arch camber again.This method saving of labor, save time, material-saving, but its key and never preferably heavy damage the mechanical property of sheet material, thereby reduced girder rigidity and service life, can be called low rigidity girder.
Summary of the invention:
The invention provides a kind of production technology of crane girder, its production technology is simple, utilizes hammering to extend arch camber, the saving of labor, save time, material-saving, improved girder rigidity, prolonged girder service life, solved problems of the prior art.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: a kind of production technology of crane girder comprises the steps:
(1), blanking: by upper cover plate, lower cover, brace panel and the straight plate shape side plate of plasma or mechanical cutting tool cutting appropriate size;
(2), side plate arch camber and reinforcement: side plate is lain against on the chopping block, arrange in proper order and beat with suitable dynamics, the suitable spacing that impacts along the side plate height center of span centre horizontal direction S/3 scope under assembled state, side plate upper edge with impulse machine, row beat width be under the assembled state the side plate bottom-to-top-height 1/4; The two sides is all with the same manner hammering processing, until reaching the camber requirement;
(3), the upper and lower cover bar hits reinforcement: upper cover plate and lower cover are put in respectively on the chopping block, beat span centre horizontal direction S/3 scope with impulse machine with suitable dynamics, the suitable spacing row that impacts, all strengthen with the same manner hammering on the two sides of upper cover plate and lower cover;
(4), be that box girder gets final product with side plate, upper cover plate, lower cover and the brace panel assembly welding that processes.
When breaking side plate with impulse machine row in the described step (2), hit first three behavior 20～30mm of a little vertical line-spacing, later every to center shift-in delegation, line-spacing increases progressively 20mm; Hitting a transverse pitch is 10～20mm.
When beating with impulse machine row in described step (2) and the step (3), the dynamics that impacts increases progressively gradually with the increase of sheet metal thickness.
When stamping cover plate and lower cover with impulse machine row in the described step (3), row gets ready apart from being 10mm in the span centre horizontal direction S/3 of upper cover plate and lower cover scope.
Production technology of the present invention compared with prior art, the technology advantages of simple, the saving of labor, save time, material-saving, improved girder rigidity greatly, alleviated deadweight, mechanical property is good, has improved load-carrying capacity, prolong girder service life, reduced manufacturing cost, improved the business economic benefit.
The specific embodiment:
For clearly demonstrating the technical characterstic of this programme, below by the specific embodiment, the present invention will be described in detail.
A kind of production technology of crane girder comprises the steps:
(1), blanking: by upper cover plate, lower cover, brace panel and the straight plate shape side plate of plasma or mechanical cutting tool cutting appropriate size;
(2), side plate arch camber and reinforcement: side plate is lain against on the chopping block, arrange in proper order and beat with suitable dynamics, the suitable spacing that impacts along the side plate height center of span centre horizontal direction S/3 scope under assembled state, side plate upper edge with impulse machine, row beat width be under the assembled state the side plate bottom-to-top-height 1/4; The two sides is all with the same manner hammering processing, until reaching the camber requirement;
Impact this scope of span centre horizontal direction S/3 scope, can realize three effects: one can guarantee that the arch camber peak value is within span centre S/10 scope; Two can make this vital parts that bears the bending moment maximum of span centre be able to emphasis strengthens; Three can improve arch camber efficient.
(3), the upper and lower cover bar hits reinforcement: upper cover plate and lower cover are put in respectively on the chopping block, beat span centre horizontal direction S/3 scope with impulse machine with suitable dynamics, the suitable spacing row that impacts, all strengthen with the same manner hammering on the two sides of upper cover plate and lower cover;
(4), be that box girder gets final product with side plate, upper cover plate, lower cover and the brace panel assembly welding that processes.
When breaking side plate with impulse machine row in the described step (2), click first three behavior 20～30mm of vertical line-spacing, later every to center shift-in delegation, line-spacing increases progressively 20mm; The click transverse pitch is 10～20mm.If the camber deficiency, but pass point impact once more apart from, line-spacing, reach requirement until camber.
When breaking side plate with impulse machine row in described step (2) and the step (3), the dynamics that impacts increases progressively gradually with the increase of sheet metal thickness.When thickness of slab was 6～10mm, dynamics was advisable with 20～40MPa; When thickness of slab is 20mm when above, dynamics is advisable with 80～100MPa.
When stamping cover plate and lower cover with impulse machine row in the described step (3), row gets ready apart from being 10mm in the span centre horizontal direction S/3 of upper cover plate and lower cover scope.
The arch camber principle:
Metal sheet after the hammering, it hits a place must leave pit (percussion mark), the pit metal is pressed within the plate face by force, forcing metal structure to change---metal lattice under the pit is flat and swell under positive pressure, the metal lattice of all sides of pit, distortion and tilting under the lateral pressure effect, to form one be source point with the pit centres to around the stress pushed radiate point, produce the cubic expansion effect simultaneously.Along with increasing of pit, the stack of stress, compression effort is more and more big, bulk effect is also more and more big, this total stress trend, impel that the side plate cross central line is above to be extended relatively to upper edge part (being impacted part), thereby causing occurring with the upper edge is that the convex of outer is answered deformation states (flexural deformation), this then our the needed arch camber form just of deformation states of answering.This answers deformation states is a progressive formation that increases the arch camber amount with the stress increase relatively, can reach the high precision in micron, and reliable and stable.
Strengthening principle and observed data:
The rigidity size of metallic material is by its elastic modulus E imbody.Its computing formula is E=k/r
m(K and m are two constants of representative metallic character in the formula, and r is an atomic distance) found out that by formula r is more little, and the E value is big more.Obviously, hammering has greatly reduced atomic distance, and modulus of elasticity is improved, and it is a self-evident inevitable outcome that rigidity is strengthened.Experimental result has also been verified the correctness of this theoretical formula.Through the mechanics engineering test center evidence of former Shandong Polytechnic Univ: two supports, middle pressurization, under same load, strengthen the back and reduce 74% than deflection value before strengthening, these data fully demonstrate the high-rigidity prestressed feature with the crane girder of this explained hereafter.
Production technology effect of the present invention is an example with thick 8mm, high 2256mm, long 30M side plate blanking arch camber, has:
1, the saving of labor, save time:
The maximum arch camber amount of this span is 42mm, and the required elongation of hammering arch camber only is 0.06mm, and handwork 2 people can finish 2 working days, several times of the comparable manual raisings of special-purpose machinery equalization.
2, material-saving material-saving:
(1), only straight plate mode is compared with the bent plate mode during side plate blanking, but economical with materials about 7.4%;
(2), because the rigidity surplus, superfluous rigidity can be converted into material economy, but reduce economical with materials about 40% under 20% condition in quiet firm experiment downwarp value.
The present invention does not describe part in detail, is those skilled in the art of the present technique's known technology.
Claims (4)
1. the production technology of a crane girder is characterized in that: comprise the steps:
(1), blanking: by upper cover plate, lower cover, brace panel and the straight plate shape side plate of plasma or mechanical cutting tool cutting appropriate size;
(2), side plate arch camber and reinforcement: side plate is lain against on the chopping block, arrange in proper order and beat with suitable dynamics, the suitable spacing that impacts along the side plate height center of span centre horizontal direction S/3 scope under assembled state, side plate upper edge with impulse machine, row beat width be under the assembled state the side plate bottom-to-top-height 1/4; The two sides is all with the same manner hammering processing, until reaching the camber requirement;
(3), the upper and lower cover bar hits reinforcement: upper cover plate and lower cover are put in respectively on the chopping block, beat span centre horizontal direction S/3 scope with impulse machine with suitable dynamics, the suitable spacing row that impacts, all strengthen with the same manner hammering on the two sides of upper cover plate and lower cover;
(4), be that box girder gets final product with side plate, upper cover plate, lower cover and the brace panel assembly welding that processes.
2. the production technology of a kind of crane girder according to claim 1 is characterized in that: when breaking side plate with impulse machine row in the described step (2), hit first three behavior 20～30mm of a little vertical line-spacing, later every to center shift-in delegation, line-spacing increases progressively 20mm; Hitting a transverse pitch is 10～20mm.
3. the production technology of a kind of crane girder according to claim 1 is characterized in that: when beating with impulse machine row in described step (2) and the step (3), the dynamics that impacts increases progressively gradually with the increase of sheet metal thickness.
4. the production technology of a kind of crane girder according to claim 1 is characterized in that: when stamping cover plate and lower cover with impulse machine row in the described step (3), row gets ready apart from being 10mm in the span centre horizontal direction S/3 of upper cover plate and lower cover scope.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910019315XA CN101691186B (en) | 2009-10-10 | 2009-10-10 | Production process of high-rigidity prestressed crane girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910019315XA CN101691186B (en) | 2009-10-10 | 2009-10-10 | Production process of high-rigidity prestressed crane girder |
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| CN101691186A CN101691186A (en) | 2010-04-07 |
| CN101691186B true CN101691186B (en) | 2011-08-10 |
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Families Citing this family (2)
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| CN104607815B (en) * | 2014-12-18 | 2016-08-17 | 大连船舶重工集团装备制造有限公司 | A kind of method making and control crane girder camber |
| CN115476064B (en) * | 2022-09-14 | 2023-06-30 | 南通中远海运重工装备有限公司 | Manufacturing process of main beam of tyre gantry crane |
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2009
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Non-Patent Citations (1)
| Title |
|---|
| 汤保昌.桥式起重机主梁制造新工艺.《新技术新工艺》.1997,(第199704期),27. * |
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