CN114700398A - Manufacturing method of large-size square-round reducer pipe - Google Patents
Manufacturing method of large-size square-round reducer pipe Download PDFInfo
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- CN114700398A CN114700398A CN202210208703.8A CN202210208703A CN114700398A CN 114700398 A CN114700398 A CN 114700398A CN 202210208703 A CN202210208703 A CN 202210208703A CN 114700398 A CN114700398 A CN 114700398A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000004080 punching Methods 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 206010066054 Dysmorphism Diseases 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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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
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
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Abstract
The invention relates to a method for manufacturing a large-size square-round reducer pipe, which comprises the following steps: the method comprises the following steps that firstly, a square and round reducer is unfolded and lofted according to a design drawing, and the square and round reducer is divided into four triangular plates and four special-shaped plates according to the unfolded lofting drawing; step two, respectively blanking four triangular plates and four special-shaped plates, wherein the special-shaped plates are decomposed into a fan-shaped plate and a plurality of fan-shaped annular plates for blanking; step three, respectively carrying out arc rolling forming on the sector plates and the sector annular plates; splicing the sector plates and the sector annular plates which are formed by the winding arc into arc-shaped special plates; and step five, splicing the four triangular plates and the four arc-shaped special-shaped plates into a square-round reducer according to a design drawing. The manufacturing method of the large-size square-circle reducer pipe solves the problem that a special-shaped plate of the large-size square-circle reducer pipe is not subjected to arc rolling processing by large-scale equipment, can quickly assemble the special-shaped plate, and improves the production efficiency of the large-size square-circle reducer pipe.
Description
Technical Field
The invention relates to the technical field of steel structure processing, in particular to a method for manufacturing a large-size square-round reducer pipe.
Background
The square round reducer pipe is also called a round pipe, and is a connecting piece with a round upper opening and a square lower opening, which is widely applied to the connection between the pipes with round end faces and square end faces and equipment, and is mainly applied to wind pipelines, for example: the circular ventilation pipe and the square ventilation pipe, the circular ventilation pipe and the square inlet and outlet of the dust removing equipment, the circular ventilation pipe and the outlet of the fan, the air conditioning unit and the inlet of the fan and the like.
The manufacturing method of the square-round reducer pipe generally comprises the following steps: the method comprises the steps of firstly cutting four triangular plates and four special-shaped plates from a steel plate, then processing the special-shaped plates into an arc shape, and finally welding the triangular plates and the special-shaped plates processed into the arc shape. In the prior art, when the arc-shaped plate is machined, a prime line is drawn on the special-shaped plate, and then a press machine bends and rolls the arc against the prime line so as to achieve the effect of bending and forming the special-shaped plate. However, for the large-size square-circle reducer pipe, as no corresponding large-scale equipment is used for one-time processing, the arc plates are easy to be not matched when a plurality of part plates bent into an arc are assembled due to incompleteness of equipment and process in the bending process of the special-shaped plates, errors exist when the part plates are assembled into the special-shaped plates, the problem of difficulty and repair of later-stage square-circle reducer pipe assembly is caused, and material and labor waste is caused.
Disclosure of Invention
In view of this, the present invention provides a method for manufacturing a large-sized square-round reducer pipe, which aims to solve the problems in the prior art.
According to the invention, the manufacturing method of the large-size square-round reducer pipe comprises the following steps:
the method comprises the following steps that firstly, unfolding and lofting are conducted on a square and round reducer according to a design drawing, and the square and round reducer is divided into four triangular plates and four special-shaped plates according to an unfolding lofting drawing;
step two, respectively blanking four triangular plates and four special-shaped plates, wherein the special-shaped plates are decomposed into a fan-shaped plate and a plurality of fan-shaped annular plates for blanking;
step three, respectively carrying out arc rolling forming on the sector plate and the plurality of sector annular plates;
splicing the fan-shaped plate and the fan-shaped annular plate which are formed by the roll arc into an arc-shaped special plate;
and step five, splicing the four triangular plates and the four arc-shaped special plates into a square-round reducer pipe according to a design drawing.
Preferably, in the second step, the plurality of sector annular plates with the same size are typeset, any two adjacent sector annular plates are connected together through the side edges, a circular guide plate with a preset width is reserved at the side edges of the two outermost sector annular plates, and then the plurality of connected sector annular plates and the circular guide plates at the two sides are integrally cut and blanked.
Preferably, the fan-shaped plates and the fan-shaped annular plates are cut and blanked by a plasma cutting machine, powder is firstly sprayed on the plate to be cut before the plurality of connected fan-shaped plates and the circular guide plates on the two sides are integrally cut and blanked, whether the data size is correct is checked, and a plurality of punching holes are punched on the side connecting lines of the adjacent fan-shaped plates for marking after the data size is correct.
Preferably, in the third step, before the sector plate and the sector annular plate are curled, a model of the square-circle reducer pipe is built on a computer according to a design drawing, chord length, chord height and circular arc radius data of each partition of the special-shaped plate are measured on the model, and then the sector plate and the sector annular plate are curled according to the circular arc radius data measured on the model, wherein the sector annular plate is curled by using a plate bending machine and is curled by using small circular arc radius data on the sector annular plate.
Preferably, when the plurality of connected fan-shaped plates are curled, the fan-shaped plate at the most middle position is curled, then the fan-shaped plate is cut according to punching marks at two sides of the fan-shaped plate, and then the rest fan-shaped plates are curled in sequence.
Preferably, when the sector plate is curled, a plain line is drawn on the sector plate, and then the press is used for bending the curl against the plain line.
Preferably, after the sector annular plate is curled, a supporting rod is arranged at one end of the small arc of the sector annular plate, and two ends of the supporting rod are fixedly connected to two ends of the small arc of the sector annular plate respectively.
Preferably, in the fourth step, a steel plate with a preset width is selected as a floor mould plate for splicing the arc-shaped profiled plates, and a ground pattern of the arc-shaped profiled plates is drawn on the floor mould plate, wherein the ground pattern comprises two side edges of the arc-shaped profiled plates;
fixing the vertex angle of the sector plate after being bent at the intersection of the side lines at two sides of the ground sample, and placing the arc end of the sector plate between the two side lines of the ground sample;
placing the first sector annular plate which is connected with the sector plate after being curled on a ground sample, and aligning and fixing two end points of the circular arc of the small circular arc end of the first sector annular plate with two side sidelines on the ground sample;
installing a door-shaped frame on the floor tire plate, wherein the lower end of the door-shaped frame is connected to the floor tire plate in a sliding manner, moving the door-shaped frame to the position above the arc end of the sector plate, arranging a jack between the door-shaped frame and the sector plate, pressing the arc end of the sector plate to be matched with the small arc end of the first sector annular plate by using the jack, and fixing the two by spot welding;
Placing the second sector annular plate which is connected with the first sector annular plate after being curled into an arc on the ground sample, and aligning and fixing two end points of an arc of a small arc end of the second sector annular plate with two side edge lines on the ground sample; moving the door-shaped frame to be above the large arc end of the first sector annular plate, arranging a jack between the door-shaped frame and the first sector annular plate, pressing the large arc end of the first sector annular plate to be matched with the small arc end of the second sector annular plate by using the jack, and then fixing the two by spot welding;
and (4) assembling the rest fan-shaped annular plates by using the same method to complete the assembly of the arc-shaped special-shaped plates.
Preferably, the fifth step further comprises:
marking a square mounting line at the bottom of the square-round reducer on the assembling platform according to a design drawing;
respectively placing the small ends of the four arc-shaped special-shaped plates at four vertex angles of the square mounting line, sequentially connecting the large ends of the four arc-shaped special-shaped plates together to form a circular structure, and aligning the circle center of the circular structure with the center of the square mounting line in the vertical direction;
respectively placing the bottom edges of the four triangular plates on four side lines of the square mounting line, and respectively connecting each triangular plate with the adjacent arc-shaped special-shaped plates in a spot welding manner;
And performing full-length welding on the joint of the triangular plate and the arc-shaped special-shaped plate.
Preferably, after the splicing and welding of the square and round reducer pipes are completed, the surface treatment is performed on the square and round reducer pipes, and then the coating is performed.
According to the manufacturing method of the large-size square-circle reducer pipe, the special-shaped plates are segmented, arc-rolled and molded, then spliced into the arc-shaped special-shaped plates, and finally spliced with the triangular plate into the square-circle reducer pipe, so that the problem that the special-shaped plates of the large-size square-circle reducer pipe are not subjected to arc-rolling processing by large-scale equipment is solved, the special-shaped plates can be rapidly assembled, and the production efficiency of the large-size square-circle reducer pipe is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a flow chart of a method for manufacturing a large-size square-round reducer pipe according to an embodiment of the invention.
Fig. 2 shows an expanded layout of a large-sized square-round reducer pipe in an embodiment of the present invention.
Fig. 3 shows a partial layout of a plurality of fan-shaped annular plates with the same size in the method for manufacturing a large-size square-round reducer pipe according to the embodiment of the invention.
Fig. 4 is a schematic diagram illustrating splicing of arc-shaped special-shaped plates in the method for manufacturing a large-size square-round reducer pipe according to the embodiment of the invention.
Fig. 5 shows a schematic structural diagram of the large-size square-round reducer pipe after being assembled according to the embodiment of the invention.
In the figure: the novel building comprises a triangular plate 1, a special-shaped plate 2, a sector annular plate 21, a first sector annular plate 211, a second sector annular plate 212, a third sector annular plate 213, a sector plate 221, a support rod 23, a guide circular plate 3, a floor tire plate 4, a floor pattern 41, a door-shaped frame 5 and a jack 6.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The invention provides a method for manufacturing a large-size square-round reducer pipe, which comprises the following steps of:
and step S1, carrying out unfolding lofting on the square and round reducer according to a design drawing, and dividing the square and round reducer into four triangular plates 1 and four special-shaped plates 2 according to the unfolding lofting drawing.
Specifically, the data of the square and round reducer pipes are firstly sorted according to the design drawing requirements, and the square and round reducer pipes are expanded and lofted according to the data, as shown in fig. 2, the expanded lofting drawing of the square and round reducer pipes is shown, and then the square and round reducer pipes are divided into four triangular plates 1 and four special-shaped plates 2 according to the expanded lofting drawing. The purpose of this step is to decompose the split with square circle reducing pipe, makes things convenient for the processing and the equipment of unloading and later stage dysmorphism board 2.
Step S2, blanking four triangular plates 1 and four special-shaped plates 2, respectively, wherein the special-shaped plates 2 are decomposed into a fan-shaped plate 221 and a plurality of fan-shaped annular plates for blanking.
When the triangular plate 1 and the special-shaped plate 2 are blanked, the special-shaped plate 2 can be decomposed into a fan-shaped plate 221 and a plurality of fan-shaped annular plates for blanking according to the size of the steel plate and the length of the plate rolling machine; the size of the steel plate can not carry out complete blanking on the triangular plate 1, or in order to improve the utilization rate of the steel plate during blanking, the steel plate can be decomposed into multiple sections for blanking, and the triangular plate 1 is spliced in the later stage.
After the special-shaped plate 2 is decomposed into the fan-shaped plate 221 and the fan-shaped annular plates, a plurality of fan-shaped annular plates 21 with the same size can be connected together in a staggered mode to perform integral blanking so as to facilitate the arc rolling forming of the fan-shaped annular plates in the later period. Specifically, a plurality of fan-shaped annular plates 21 with the same size are laid out, any two adjacent fan-shaped annular plates 21 are connected together through the side edges, and a circular guide plate 3 with a preset width is reserved at the side edge of the two outermost fan-shaped annular plates 21 (the circular guide plate 3 is a section of steel plate connected to the outer side of the fan-shaped annular plate 21 so as to be capable of curling the side edge position of the fan-shaped annular plate 21), and then the connected fan-shaped annular plates 21 and the circular guide plates 3 at the two sides are cut and blanked integrally. As shown in fig. 3, a layout of a plurality of sector annular plates 21 having the same size in this embodiment is shown, and when cutting and blanking are performed, cutting is performed along the large and small arcs of the sector annular plates 21 and the outer side edges of the guide circular plates 3, so that the plurality of sector annular plates 21 and the guide circular plates 3 on both sides are blanked integrally. The fan-shaped annular plates 21 with the same size are connected together for integral blanking, and the adjacent fan-shaped annular plates 21 can be used as the circular guide plate 3 when the plate bending machine is used for arc bending in the later period, so that the blanking is facilitated, and meanwhile, the plate materials are saved for the engineering.
In this embodiment, the triangular plate 1, the sector plate 221 and the sector annular plate are all cut and blanked on the steel plate by using a plasma cutting machine, wherein before the plurality of sector annular plates 21 connected together and the circular guide plates 3 on both sides are integrally cut and blanked, powder is firstly sprayed on the plate to be cut, whether the size of data is correct is checked, a plurality of punching holes are punched on the side connecting lines of the adjacent sector annular plates 21 for marking after the data is correct, and the purpose of punching the punching holes on the side connecting lines of the adjacent sector annular plates for marking is to cut the sector annular plates 21 which are finished by arc rolling according to the punching holes marks after the sector annular plates 21 are subjected to arc rolling in the later stage.
Step S3, performing arc rolling on the sector plate 221 and the plurality of sector annular plates, respectively.
In this step, before the arc rolling is performed on the sector plate 221 and the sector annular plate, a model of a large-size square-circle reducer pipe is established on a computer according to a design drawing, chord length, chord height and arc radius data of each division of the special-shaped plate 2 are measured on the model, and then the arc rolling is performed on the sector plate 221 and the sector annular plate according to the arc radius data measured on the model. The sector ring is curled by a plate bending machine, and the small arc radius data on the sector ring-shaped plate is used for curling, namely the small end arc radius data on the sector ring-shaped plate is used for curling.
Specifically, when the connected fan-shaped ring plates 21 are curled, the fan-shaped ring plate at the most middle position is curled, then the punching mark positions at the two sides of the fan-shaped ring plate are subjected to line snapping, the fan-shaped ring plate is cut according to the line snapping, and then the rest fan-shaped ring plates are sequentially curled. After the circular arc is accomplished to fan annular plate book arc, measurable quantity fan annular plate book arc accomplish the back small circle arc end chord length and the chord height with measure on the model chord length, chord height data unanimous, like data inconsistent, adjust again, until satisfying the requirement, then the small circle arc one end of fan annular plate sets up a bracing piece 23, the both ends difference fixed connection of bracing piece 23 is in the both ends of the small circle arc of fan annular plate, bracing piece 23 play the effect of the small circle arc one end of the fan annular plate of supporting fixed book arc completion, prevent that the circular arc after rolling up from taking place to warp, guarantee the dimensional stability of the small circle arc one end of fan annular plate.
In this step, when the arc is rolled on the sector plate 221, it is inconvenient to use a plate rolling machine to roll the arc because one end of the sector plate 221 has a small size. In this embodiment, the arc rolling forming of the sector plate 221 is performed by a press, first drawing a prime line on the sector plate 221, then bending and rolling an arc against the prime line by the press, and performing multiple pressing to complete the arc rolling forming of the sector plate 221, where the radius of the large-end arc after the arc rolling of the sector plate 221 is smaller than or equal to the radius of the arc measured on the model, so as to adjust the arc-shaped special-shaped plate during later assembling.
Step S4, splicing the sector plate 221 and the sector annular plate after the arc rolling molding into an arc-shaped special plate.
As shown in fig. 4, in order to facilitate splicing the fan-shaped plate 221 and the fan-shaped ring plate after the roll arc forming into the arc-shaped profiled plate, a steel plate with a predetermined width is first selected as the floor tire plate 4 for splicing the arc-shaped profiled plate, and the floor pattern 41 of the arc-shaped profiled plate is released on the floor tire plate 4, and the floor pattern 41 includes two side edges of the arc-shaped profiled plate.
And then fixing the vertex angle of the arc-rolled sector-shaped plate 221 at the intersection of two side edges of the ground sample 41, wherein the arc end of the sector-shaped plate 221 is placed between the two side edges of the ground sample 41.
In this embodiment, the special plate 2 is divided into a sector plate 221 and three sector annular plates, the three sector annular plates are sequentially arranged as a first sector annular plate 211, a second sector annular plate 212 and a third sector annular plate 213 from small to large, the first sector annular plate 211 connected to the sector plate 221 after being wound into an arc is placed on the ground sample 41, two end points of the arc of the small arc end of the first sector annular plate are aligned with and fixed to two side edge lines on the ground sample 41, and the large arc end of the first sector annular plate 211 is located at the middle position between the two side edge lines of the ground sample 41.
The method comprises the steps that a door-shaped frame 5 is installed on the floor tire plate 4, the lower end of the door-shaped frame 5 is connected to the floor tire plate 4 in a sliding mode, the door-shaped frame 5 is moved to the position above the arc end of the sector plate 221, a jack 6 is arranged between the door-shaped frame 5 and the sector plate 221, the jack 6 is used for pressing the arc end of the sector plate 221 to be matched with the small arc end of the first sector annular plate 211 and then fixing the first sector annular plate and the first sector annular plate in a spot welding mode, a stone hammer is used for hammering the sector plate 221 continuously in the pressing process, and the side edge of the sector plate 221 is prevented from being clamped by the floor tire plate 4. In this embodiment, the door-shaped frame 5 is made of a steel plate, two legs of the door-shaped frame 5 are respectively provided with a transverse sliding chute, and the two transverse sliding chutes are respectively slidably clamped at two sides of the floor slab 4.
Placing the second fan-shaped annular plate 212 connected with the first fan-shaped annular plate 211 on the ground sample 41 after being curled, aligning and fixing two end points of an arc of a small arc end of the second fan-shaped annular plate 212 with two side edges of the ground sample 41, and simultaneously enabling a large arc end of the second fan-shaped annular plate 212 to be located in the middle position between the two side edges of the ground sample 41; the door-shaped frame 5 is moved to the position above the large arc end of the first sector annular plate 211, the jack 6 is arranged between the door-shaped frame 5 and the first sector annular plate 211, the large arc end of the first sector annular plate 211 is pressed to be matched with the small arc end of the second sector annular plate 212 by the jack 6 and then fixed by spot welding, the first sector annular plate 211 is continuously hammered by a stone hammer in the pressing process, and the side edge of the first sector annular plate 211 is prevented from being clamped by the floor slab 4.
The third sector annular plate 213 is assembled by the same method, and finally the arc-shaped irregular plate is assembled.
And step S5, splicing the four triangular plates 1 and the four arc-shaped special-shaped plates into a square-round reducer pipe according to a design drawing.
Specifically, the step further comprises:
and marking a square mounting line at the bottom of the square round reducer pipe on the assembling platform according to a design drawing.
The small ends of the four arc-shaped special-shaped plates are respectively placed at four top corners of the square mounting line, the large ends of the four arc-shaped special-shaped plates are sequentially connected together to form a circular structure, and the circle center of the circular structure is aligned with the center of the square mounting line in the vertical direction.
The bottom edges of the four triangular plates 1 are respectively placed on four side lines of the square mounting line, each triangular plate 1 is respectively connected with the adjacent arc-shaped special-shaped plates in a spot welding mode, and the structure of the spliced square-round reducer pipe is shown in fig. 5. After the completion of set-square 1 and arcuation dysmorphism board spot welding, the inside of the square circle reducing pipe after assembling sets up a plurality of vaulting poles, the vaulting pole can adopt the section bar of sufficient intensity to make, support the inside of square circle reducing pipe from a plurality of directions, the both ends spot welding of vaulting pole is connected on set-square 1 or the arcuation dysmorphism board of square circle reducing pipe, the effect of vaulting pole is when preventing follow-up full welding, the square circle reducing pipe that splices produces welding deformation because of the effect of welding stress.
And finally, performing full-length welding on the spliced part of the triangular plate 1 and the arc-shaped special-shaped plate, annealing treatment if necessary to eliminate welding stress, and dismantling the stay bars arranged in the square-circle reducer pipe, so that the assembly welding of the large-size square-circle reducer pipe is completed.
After the square and round reducer pipes are spliced and welded, the square and round reducer pipes are subjected to surface treatment, including welding slag polishing, sand blasting, rust removal and the like, and finally are coated.
In conclusion, the method for manufacturing the large-size square-round reducer pipe provided by the invention has the following advantages: the large-size square-round reducer pipe has large size, and when no corresponding large arc rolling equipment exists, arc rolling forming can be completed by using common small plate rolling equipment after segmenting the special-shaped plate; the fan-shaped annular plates after the special-shaped plates are segmented are connected together for integral blanking, and the adjacent fan-shaped annular plates can be used as circular guide plates during arc rolling forming, so that the waste of plates caused by excessive circular guide plates can be reduced, and the plate materials are saved for engineering manufacture; the traditional machining of the special-shaped plate is converted into machining by using plate rolling equipment through a folding arc, so that later assembly and welding seams become more coincident, the segmented connection of the square and round reducer pipe becomes more round, and the square and round reducer pipe is more accurate to manufacture. The manufacturing method can quickly assemble the special-shaped plate and improve the production efficiency of the large-size square-round reducer pipe.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method for manufacturing a large-size square-round reducer pipe is characterized by comprising the following steps:
the method comprises the following steps that firstly, unfolding and lofting are conducted on a square and round reducer according to a design drawing, and the square and round reducer is divided into four triangular plates and four special-shaped plates according to an unfolding lofting drawing;
step two, respectively blanking four triangular plates and four special-shaped plates, wherein the special-shaped plates are decomposed into a fan-shaped plate and a plurality of fan-shaped annular plates for blanking;
step three, respectively carrying out arc rolling forming on the sector plate and the plurality of sector annular plates;
splicing the fan-shaped plate and the fan-shaped annular plate which are formed by the roll arc into an arc-shaped special plate;
and step five, splicing the four triangular plates and the four arc-shaped special plates into a square-round reducer pipe according to a design drawing.
2. The manufacturing method of the large-size square-circular reducer pipe according to claim 1, wherein in the second step, the plurality of fan-shaped plates with the same size are typeset, any two adjacent fan-shaped plates are connected together through the side edges, a guide circular plate with a preset width is reserved at the side edges of the two outermost fan-shaped plates, and then the plurality of connected fan-shaped plates and the guide circular plates at the two sides are integrally cut and blanked.
3. The method for manufacturing the large-size square-circular reducer pipe according to claim 2, wherein the fan-shaped plates and the fan-shaped plates are cut and blanked by a plasma cutting machine, powder is sprayed on the plate to be cut before the plurality of connected fan-shaped plates and the guide circular plates on two sides are integrally cut and blanked, whether the data size is correct is checked, and a plurality of punching holes are punched on the side connecting lines of the adjacent fan-shaped plates to mark the data size, and the punching holes are punched after the data size is correct.
4. The method for manufacturing the large-size square-circle reducer pipe according to claim 3, wherein in the third step, before the arc rolling is performed on the sector plate and the sector-ring plate, a model of the square-circle reducer pipe is built on a computer according to design drawings, chord length, chord height and arc radius data of each partition of the irregular plate are measured on the model, and the arc rolling is performed on the sector plate and the sector-ring plate according to the arc radius data measured on the model, wherein the sector ring is performed by using a plate rolling machine, and the arc rolling is performed by using small arc radius data on the sector-ring plate.
5. The method as claimed in claim 4, wherein when the connected fan-shaped plates are rolled, the fan-shaped plate at the middle is rolled, then the fan-shaped plate is cut according to the punching marks at the two sides of the fan-shaped plate, and the remaining fan-shaped plates are rolled in sequence.
6. The method for manufacturing the large-size square-circle reducer pipe according to claim 5, wherein when the sector plate is curled, a plain line is drawn on the sector plate, and then the press is used for bending the curled arc against the plain line.
7. The method as claimed in claim 5, wherein a support rod is disposed at one end of the small arc of the sector annular plate after the sector annular plate is rolled, and two ends of the support rod are fixedly connected to two ends of the small arc of the sector annular plate.
8. The method for manufacturing large-size square-round reducer pipes according to claim 7, wherein in the fourth step, a steel plate with a preset width is selected as a floor jig plate for splicing the arc-shaped profiled plates, and a ground pattern of the arc-shaped profiled plates is formed on the floor jig plate, wherein the ground pattern comprises two side edges of the arc-shaped profiled plates;
fixing the vertex angle of the sector plate after being bent at the intersection of the side lines at two sides of the ground sample, and placing the arc end of the sector plate between the two side lines of the ground sample;
placing the first sector annular plate which is connected with the sector plate after being curled on a ground sample, and aligning and fixing two end points of the circular arc of the small circular arc end of the first sector annular plate with two side sidelines on the ground sample;
Installing a door-shaped frame on the floor tire plate, wherein the lower end of the door-shaped frame is connected to the floor tire plate in a sliding manner, moving the door-shaped frame to the position above the arc end of the sector plate, arranging a jack between the door-shaped frame and the sector plate, pressing the arc end of the sector plate to be matched with the small arc end of the first sector annular plate by using the jack, and fixing the two by spot welding;
placing the second sector annular plate which is connected with the first sector annular plate after being curled into an arc on the ground sample, and aligning and fixing two end points of an arc of a small arc end of the second sector annular plate with two side edge lines on the ground sample; moving the door-shaped frame to be above the large arc end of the first sector annular plate, arranging a jack between the door-shaped frame and the first sector annular plate, pressing the large arc end of the first sector annular plate to be matched with the small arc end of the second sector annular plate by using the jack, and then fixing the two by spot welding;
and (4) assembling the rest fan-shaped annular plates by using the same method to complete the assembly of the arc-shaped special-shaped plates.
9. The method of claim 8, wherein the step five further comprises:
Marking a square mounting line at the bottom of the square-round reducer on the assembling platform according to a design drawing;
respectively placing the small ends of the four arc-shaped special-shaped plates at four vertex angles of a square mounting line, sequentially connecting the large ends of the four arc-shaped special-shaped plates together to form a circular structure, and aligning the circle center of the circular structure with the center of the square mounting line in the vertical direction;
respectively placing the bottom edges of the four triangular plates on four side lines of a square mounting line, and respectively connecting each triangular plate with an adjacent arc-shaped special plate in a spot welding manner;
and performing full-length welding on the splicing part of the triangular plate and the arc-shaped special plate.
10. The method for manufacturing the large-size square-round reducer pipe according to claim 1, wherein after the splicing and welding of the square-round reducer pipe are completed, the square-round reducer pipe is coated after surface treatment.
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