CN110605490B - Automatic manufacturing method of bottom die of segmental box girder - Google Patents
Automatic manufacturing method of bottom die of segmental box girder Download PDFInfo
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- CN110605490B CN110605490B CN201810617385.4A CN201810617385A CN110605490B CN 110605490 B CN110605490 B CN 110605490B CN 201810617385 A CN201810617385 A CN 201810617385A CN 110605490 B CN110605490 B CN 110605490B
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- bottom die
- steel plate
- box girder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Physics & Mathematics (AREA)
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a method for manufacturing an automatic segmental box girder bottom die, which belongs to the technical field of mechanical equipment manufacturing and has the advantage of keeping the integral flatness by manufacturing the automatic segmental box girder bottom die, and the technical scheme comprises the following steps: the method comprises the following steps: preparing equipment; step two: preparing steel; step three: arranging a steel plate; step four: arranging framework section bars; step five: positioning the framework section; step six: integrally fixing; step seven: and (4) integrally welding.
Description
Technical Field
The invention relates to the technical field of mechanical equipment manufacturing, in particular to a method for automatically manufacturing a bottom die of a segmental box girder.
Background
The automatic section box girder template is widely applied to railway bridges.
Its automatic segment case roof beam die block is mainly by the rectangle steel sheet, and vertically and horizontally staggered welded fastening is formed at the skeleton section bar on the rectangle steel sheet, nevertheless because the welded position of skeleton section bar and rectangle steel sheet is very many, and go on in pieces, and during the welding, welded position can produce great heat, can produce the inflation after the rectangle steel sheet is heated, and after the welding finishes, because expend with heat and contract with cold's reason, lead to the steel sheet to produce the bending, thereby make later stage die block not good with other structure cooperations, and also produce unqualified phenomenon during the use.
And at present, the bottom die is basically flattened and restored through a later-stage reverse extrusion mode, when the deformation amplitude of the bottom die is not large, the small-amplitude extrusion cannot generate large influence on a welding point, and when the deformation amplitude of the bottom die is large and the mode of reverse extrusion is adopted, the deformation of the bottom die is too large, the welding point is cracked, so that the normal use of the later-stage bottom die is influenced, and the bottom die is directly scrapped.
Disclosure of Invention
The invention aims to provide an automatic segment box girder bottom die manufacturing method which has the advantage that the integral flatness is kept by the automatic segment box girder bottom die manufacturing.
The technical purpose of the invention is realized by the following technical scheme: an automatic segment box girder bottom die manufacturing method comprises the following steps:
the method comprises the following steps: preparing equipment, namely preparing processing equipment for steel;
step two: preparing steel, namely cutting, cleaning and deburring a steel plate and a framework section;
step three: arranging a steel plate, namely placing the rectangular steel plate on a welding platform, and arranging a gasket between the center position of the long edge of the steel plate and the welding platform;
step four: arranging framework section bars, namely placing the framework section bars on a steel plate in a criss-cross manner, and fixing the steel plate and the framework section bars to each other through primary welding to form a basic structure of the bottom die of the automatic segmental box girder;
step five: positioning the framework section, and accurately positioning the basic-formed automatic segment box girder bottom die by a positioner positioned on the long side surface of the steel plate on the welding platform;
step six: integrally fixing, namely pressing down two ends of a bottom die of the basically formed automatic segmental box girder through a fixer on the welding platform and positioned on the short side surface of the steel plate, and enabling the steel plate to form an inverted arch state on the welding platform through the action of a gasket;
step seven: and (3) integrally welding, namely comprehensively welding and fixing the contact positions between the steel plate and the framework section bar and between the framework section bar and the framework section bar to form a complete automatic section box girder bottom die.
Through adopting above-mentioned technical scheme, through the effect of fixer and gasket, make the steel sheet that does not carry out the welding at first present the state of the bending of invert arch, the thickness of gasket is between 1-5mm, make the skeleton section bar weld under the state of steel sheet small amplitude bending, keep the crooked surplus under the expend with heat and contract with cold of later stage, after the welding finishes, through natural cooling, make the die block whole still keep the state of invert arch, take away fixer and gasket again, make the die block carry out the forward bending by oneself through the inside elasticity that resets of self and recover, thereby make the die block keep basic level and smooth state, reduce the crooked repair range of later stage to the die block, thereby effectual reduction welding point produces the crack, promote the qualification rate of die block.
Further, step eight: and adjusting the bottom die, namely extruding the middle part of the bottom die by supporting two ends of the bottom die and integrally leveling the bottom die.
By adopting the technical scheme, the arched positions of the bottom die are reversely extruded through the two supporting ends, so that the bottom die is reversely bent and deformed to achieve the leveling effect.
Further, step nine: and (4) re-adjusting the bottom die, and performing heating micro-adjustment on the bending position of the framework section bar on the long side of the steel plate in a heat treatment mode.
By adopting the technical scheme, the bending position of the framework section bar is heated, and then the temperature is rapidly reduced, so that the bending position of the framework section bar is contracted, and the leveling effect is achieved.
Further, when the bending amplitude of the bottom die is not large, the heating fine adjustment is carried out by directly skipping the step eight and carrying out the step nine.
By adopting the technical scheme, the processing steps are effectively reduced, and the workload is reduced.
Furthermore, triangular region heating and re-cooling are carried out on the bending position of the framework section bar on the long side of the steel plate, region shrinkage with large heating area is realized, and the steel plate is guided to be leveled.
By adopting the technical scheme, one vertex angle of the triangular area faces the steel plate during heating, and the framework section bar is reversely bent due to different shrinkage amounts during cooling, so that the bending generated during welding can be offset.
Further, step seven: in the process of integral welding, the pressing acting force of the fixer is adjusted, the inverted arch amplitude is reduced, and the bottom die is convenient to flatly reset.
Through adopting above-mentioned technical scheme, at the power that the in-process of welding reduces the fixer and pushes down gradually, make the die block carry out slow level along with the welded progress and reset, reduce the time that later stage elasticity replied, improve machining efficiency.
Further, step seven: the fixer is pressed down through the jack, so that the magnitude of the acting force can be adjusted conveniently.
By adopting the technical scheme, the jack can conveniently adjust the pressure of the bottom die, and is convenient for people to use.
Further, step five: and inserting a positioning pin in the positioner into the prefabricated hole of the long-side framework section of the steel plate for positioning.
By adopting the technical scheme, the prefabricated holes in the framework section bars are utilized for positioning, so that the positioning is accurate and convenient, and the positioning efficiency is effectively improved.
In conclusion, the invention has the following beneficial effects:
1. the flatness of the welded bottom die is improved by arranging the inverted arch;
2. the bottom die has convenient and simple fine adjustment of flatness;
3. the whole processing operation of the bottom die is convenient.
Drawings
FIG. 1 is a diagram of the process steps of this example;
FIG. 2 is a perspective view of the bottom mold of the present embodiment;
FIG. 3 is a view showing a fixed state during welding of the bottom mold according to the present embodiment;
FIG. 4 is an enlarged view of A in FIG. 3;
FIG. 5 is a view illustrating the adjustment of the bottom mold in the present embodiment;
fig. 6 is a diagram illustrating the readjustment of the bottom mold in this embodiment.
In the figure, 1, steel plate; 2. framework section bars; 21. prefabricating holes; 3. welding a platform; 4. a gasket; 5. a holder; 6. a positioner; 7. a support member; 8. a hydraulic cylinder; 9. a triangular region.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
An automatic segment box girder bottom die manufacturing method comprises the following steps as shown in figures 1 and 2:
the method comprises the following steps: the equipment is prepared, the processing equipment of steel is prepared, the processing equipment is prepared in advance, and the equipment can be used smoothly in the later period of work.
Step two: preparing steel, namely cutting, cleaning and deburring the steel plate 1 and the framework section bar 2, preliminarily processing the steel to be in a preset structural shape of the bottom die, and preparing for welding.
Step three: the steel sheet sets up, on placing welding platform 3 with rectangle steel sheet 1 as shown in fig. 3, 4, set up gasket 4 between the long limit central point of steel sheet 1 puts and welding platform 3, gasket 4 pads up the middle part of rectangle steel sheet 1 to rectangle steel sheet 1 both ends are owing to do not have the support, thereby produce the natural flagging, thereby are that rectangle steel sheet 1 forms the inverted arch state of small-amplitude.
Step four: the framework section bars are arranged, the framework section bars 2 are placed on the steel plate 1 in a criss-cross mode as shown in fig. 3, mutual fixing between the steel plate 1 and the framework section bars 2 is carried out through primary welding to form an automatic section box girder bottom die basic structure, the framework section bars 2 and the steel plate 1 are subjected to primary shaping through simple welding to form a complete bottom die structure, the later-stage overall comprehensive welding is facilitated, and the later-stage overall welding efficiency is effectively improved.
Step five: the framework section positioning method comprises the steps of positioning a basic-formed automatic segment box girder bottom die accurately through a positioner 6 which is arranged on the long side surface of a steel plate 1 on a welding platform 3 as shown in fig. 3, inserting a positioning pin in the positioner 6 into a prefabricated hole 21 of the long side framework section 2 of the steel plate 1 for positioning, and positioning through the prefabricated hole 21 on the framework section 2, wherein the positioning is accurate and convenient, and the positioning efficiency is effectively improved.
Step six: and integrally fixing, namely pressing down two ends of a bottom die of the basically formed automatic segmental box girder through a fixing device 5 positioned on the short side surface of the steel plate 1 on the welding platform 3 as shown in fig. 3 and 4, enabling the steel plate 1 to form an inverted arch state on the welding platform 3 through the action of a gasket 4, enabling the steel plate 1 which is not welded to be in an inverted arch bending state at first through the action of the fixing device 5 and the gasket 4, and enabling the thickness of the gasket 4 to be between 1 and 5 mm.
Step seven: overall welding, as shown in fig. 3, the steel plate 1 and the framework section bar 2 are comprehensively welded and fixed at the contact position between the framework section bar 2 and the framework section bar 2, so that the framework section bar 2 is welded in a state of small-amplitude bending of the steel plate 1, the bending allowance under thermal expansion and cold contraction in the later period is kept, after welding is completed, the bottom die is kept in an inverted arch state as a whole through natural cooling, the fixing device 5 and the gasket 4 are taken away, the bottom die is automatically and positively bent and restored through the reset elastic force in the bottom die, the bottom die is kept in a basic flat state, the bending restoration amplitude of the bottom die in the later period is reduced, cracks are effectively reduced at welding points, the qualification rate of the bottom die is improved, and a complete automatic section box girder bottom die is formed.
Step eight: and (3) adjusting the bottom die, namely supporting two ends of the bottom die through a supporting piece 7 as shown in fig. 5, extruding the middle part of the bottom die through a hydraulic cylinder 8, integrally leveling the bottom die, and reversely extruding the arched position of the bottom die through the supporting two ends to ensure that the bottom die is reversely bent and deformed to achieve the leveling effect.
Step nine: and (3) readjusting the bottom die, namely heating and finely adjusting the bending position of the framework section bar 2 on the long side of the steel plate 1 by a heat treatment mode as shown in fig. 6, heating the bending position of the framework section bar 2, rapidly cooling to shrink the bending position of the framework section bar 2, so as to achieve the leveling effect, heating and re-cooling a triangular area 9 at the bending position of the framework section bar 2 on the long side of the steel plate 1 to shrink the area with a large heating area, guiding the steel plate 1 to level, enabling one vertex angle of the triangular area 9 to face the steel plate 1 during heating, shrinking the triangular area 9 along the edge during cooling, so that the shrinkage amplitude of the position far away from the steel plate 1 is larger than that of the position close to the steel plate 1, and causing the framework section bar 2 to generate reverse bending due to different shrinkage amounts, so as to offset the bending generated during welding.
When the bending amplitude of the bottom die is not large, the step eight is directly skipped to perform the step nine to perform heating micro adjustment, so that the processing steps are effectively reduced, and the workload is reduced.
And when the flatness of the bottom die after integral welding meets the design requirement, the processing of the step eight and the step nine is not needed, the processing steps are effectively reduced, and the workload is reduced.
As shown in fig. 3 at whole welded in-process, through the effort of pushing down of adjustment fixer 5, reduce the anti-range of encircleing, the die block of being convenient for levels and resets, the power of 5 pushes down at the gradual reduction fixer of welded in-process, make the die block carry out slow level and reset along with the welded progress, reduce the time of later stage elastic response, and the machining efficiency is improved, and fixer 5 pushes down through the jack, the effort size adjustment of being convenient for, the jack is convenient to the pressure adjustment of die block, the people of being convenient for use.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. An automatic manufacturing method of a bottom die of a segmental box girder is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: preparing equipment, namely preparing processing equipment for steel;
step two: preparing steel, namely cutting, cleaning and deburring a steel plate (1) and a framework section bar (2);
step three: arranging a steel plate, namely placing a rectangular steel plate (1) on a welding platform (3), and arranging a gasket (4) between the center position of the long edge of the steel plate (1) and the welding platform (3);
step four: arranging framework sectional materials, namely placing the framework sectional materials (2) on a steel plate (1) in a criss-cross mode, and fixing the steel plate (1) and the framework sectional materials (2) to each other through primary welding to form a basic structure of an automatic section box girder bottom die;
step five: positioning the framework section, namely accurately positioning the position of a basically formed automatic segmental box girder bottom die through a positioner (6) which is positioned on the long side surface of the steel plate (1) on the welding platform (3);
step six: integrally fixing, namely pressing down two ends of a bottom die of the automatic segmental box girder which is basically formed through a fixer (5) which is positioned on the short side surface of the steel plate (1) on the welding platform (3), and enabling the steel plate (1) to form an inverted arch state on the welding platform (3) through the action of a gasket (4);
step seven: and (2) integrally welding, namely, comprehensively welding and fixing the contact positions between the steel plate (1) and the framework section (2) and between the framework section (2) and the framework section (2), and gradually reducing the downward pressing force of the fixer (5) in the welding process to ensure that the bottom die is slowly and smoothly reset along with the welding progress, so that the inverted arch amplitude is reduced, the bottom die is convenient to smoothly reset, and the complete automatic section box girder bottom die is formed.
2. The method of manufacturing an automatic segment box girder bottom mold according to claim 1, wherein: step eight: and adjusting the bottom die, namely extruding the middle part of the bottom die by supporting two ends of the bottom die and integrally leveling the bottom die.
3. The method for manufacturing an automatic segment box girder bottom mold according to claim 2, wherein the method comprises the following steps: step nine: and (4) re-adjusting the bottom die, and heating and micro-adjusting the bending position of the framework section bar (2) on the long side of the steel plate (1) in a heat treatment mode.
4. The method of manufacturing an automatic segment box girder bottom mold according to claim 3, wherein: and when the bending amplitude of the bottom die is not large, directly skipping the step eight to perform the step nine to perform heating micro adjustment.
5. The method of manufacturing an automatic segment box girder bottom mold according to claim 3, wherein: the bending position of the framework section bar (2) on the long side of the steel plate (1) is heated and cooled again in a triangular area (9), so that the area shrinkage with a large heating area is realized, and the steel plate (1) is guided to be leveled.
6. The method of manufacturing an automatic segment box girder bottom mold according to claim 1, wherein: step seven: the fixer (5) is pressed down by a jack, so that the magnitude of the acting force can be adjusted conveniently.
7. The method of manufacturing an automatic segment box girder bottom mold according to claim 1, wherein: step five: and (3) inserting a positioning pin in the positioner (6) into a prefabricated hole (21) of the long-side framework section bar (2) of the steel plate (1) for positioning.
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| CN201810617385.4A CN110605490B (en) | 2018-06-15 | 2018-06-15 | Automatic manufacturing method of bottom die of segmental box girder |
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| CN201810617385.4A CN110605490B (en) | 2018-06-15 | 2018-06-15 | Automatic manufacturing method of bottom die of segmental box girder |
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| CN202984995U (en) * | 2013-01-06 | 2013-06-12 | 中建海峡建设发展有限公司 | Device for preventing welding deformation of steel plate |
| CN103862141A (en) * | 2014-03-11 | 2014-06-18 | 中国化学工程第六建设有限公司 | Chemical composite steel pipe welding process |
| CN103990926A (en) * | 2014-06-10 | 2014-08-20 | 中铁宝桥（扬州）有限公司 | Predeformation jig frame |
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Effective date of registration: 20221125 Address after: 410119 229, Floor 2, Hexiang Science Park Complex, No. 98, Lixiang Road, Changsha Area, Changsha Free Trade Pilot Zone, Hunan Province Patentee after: Hunan Wuxin Intelligent Machinery Manufacturing Co.,Ltd. Address before: 301700 No.7 Xinxing Road, Wuqing Development Zone, New Technology Industrial Park, Wuqing District, Tianjin Patentee before: CHINA RAILWAY TIANJIN WUXIN STEEL FORMWORK CO.,LTD. |
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