CN109014796B - Method for manufacturing large-capacity pressed thick boiler barrel tile - Google Patents
Method for manufacturing large-capacity pressed thick boiler barrel tile Download PDFInfo
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- CN109014796B CN109014796B CN201811088085.8A CN201811088085A CN109014796B CN 109014796 B CN109014796 B CN 109014796B CN 201811088085 A CN201811088085 A CN 201811088085A CN 109014796 B CN109014796 B CN 109014796B
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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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- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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Abstract
The invention discloses a method for manufacturing thick tiles of a large-capacity pressed boiler drum, relates to the technical field of boiler equipment, and particularly relates to a technology for manufacturing the thick tiles of the large-capacity pressed boiler drum. The invention aims to solve the problem that the transition slopes on two sides of a longitudinal seam groove are overlarge because the process allowance of pressing the longitudinal seam straight edge by using thick boiler barrel tiles is not fully utilized. The manufacturing method of the thick tile of the large-capacity pressed boiler barrel fully utilizes the process allowance of the vertical seam straight edge which is machined off by the thick tile of the boiler barrel in the prior art, and the transition of the inner side of the vertical seam groove of the thick tile is preprocessed before hot-press forming, so that the process allowance of the vertical seam straight edge of the thick tile is reduced; during hot press molding, flat steel bars are arranged on the outer edge of the thick tile for sectional point pressing; and (4) processing the transition of the outer side of the longitudinal seam groove after hot press molding. The novel manufacturing method is innovative, so that the manufacturing technical level, the design structure and the economic benefit of the large-capacity pressing drum are improved, and the method is suitable for pressing the thick tiles of the drum with different specifications and thicknesses.
Description
Technical Field
The invention relates to the technical field of boiler equipment, in particular to a manufacturing technology for pressing thick tiles of a boiler barrel with large capacity.
Background
Hundreds of high-capacity pressing drums in China have been produced for a long time, structures of 215 degrees/145 degrees and R889/R874.5 with unequal-thickness double longitudinal seams and with the thickness of SA299 153/182mm or the thickness of DIWA35 115/145mm are adopted, because the longitudinal edges of thick tiles deflect outwards after pressing, and arc shapes which cannot meet the design requirements cannot be achieved, 70-120 mm of longitudinal seam straight-edge process allowance needs to be reserved in actual production, the longitudinal seam straight-edge process allowance of the thick tile is cut off after pressing, and the 14-degree transition of the two sides of a longitudinal seam groove of the thick tile is symmetrically processed at the same time, the high-capacity pressing drum thick tile design structure and the manufacturing technology are old and lagged, and the economic benefit is poor.
Disclosure of Invention
The invention aims to solve the problems of more consumed materials, poor economic benefit and increased manufacturing cost caused by overlarge transition slopes at two sides of a longitudinal seam groove because process margins of a straight edge of a longitudinal seam are not fully utilized after a thick boiler drum tile is pressed, and further provides a manufacturing method of the large-capacity pressed thick boiler drum tile.
The technical scheme includes that process allowance of the traditional boiler barrel thick tile is fully utilized, two ends of the boiler barrel thick tile comprise two longitudinal seam grooves, the inner sides of the longitudinal seam grooves are symmetrically distributed on two sides of the grooves in a transition mode, the outer sides of the longitudinal seam grooves are symmetrically distributed in a transition mode, the manufacturing method comprises the specific steps of firstly, gas cutting and blanking a boiler barrel thick tile steel plate blank, correcting, pre-planning and milling the inner sides of the longitudinal seam grooves, machining the transition angle to be 3-8 degrees, machining the length to be 100-160 mm according to actual conditions, reserving the process allowance of the longitudinal seam straight edges to be 30-38 mm, secondly, heating the boiler barrel thick tile steel plate blank, and stacking the outer edge of the boiler barrel thick tile steel plate blank, wherein the thickness section of the outer edge of the boiler barrel2～12×80mm2The flat steel bars are subjected to sectional point pressing, and the number of the stacked flat steel bars is 1-3 layers according to actual conditions; thirdly, cutting off the process allowance of the straight edge of the longitudinal seam of the thick boiler barrel tile by gas cutting, machining a longitudinal seam groove and a transition angle outside the longitudinal seam groove after finely correcting the thick boiler barrel tile, and machining the transition angle to be 3-8 degrees according to actual conditions.
The invention has the beneficial effects that: the process allowance of the straight edge of the longitudinal seam of the thick tile is reduced, and the material is saved; the transition angle of the outer side of the longitudinal seam groove is reduced, after hot press molding, when a thick tile and a thin tile are buckled and welded into a barrel body, the transition gradient of the outer side of the longitudinal seam groove is smaller, and the buckled transition part becomes gentle, so that the barrel body can easily rotate on the roller frame, the radial run-out is gentle, the transition plate is prevented from being additionally welded or the circumferential welding transition is avoided near the longitudinal seam, and the manufacturing cost is reduced; the novel manufacturing method is innovative, so that the technical level, the design structure and the economic benefit of manufacturing the large-capacity pressing drum are improved, the technology is novel, practical, advanced and feasible, and the method is suitable for pressing the thick tiles of the drum with different thicknesses in various specifications.
Drawings
FIG. 1 is a schematic view of a structure for processing the inner side of a seam groove of a large-capacity pressed thick tile steel plate blank of a boiler barrel, wherein 2 shows the transition of the inner side of a longitudinal seam groove;
FIG. 2 is a schematic view showing a method for manufacturing a thick tile of a large capacity pressing drum, in which 5 denotes an edge portion of the thick tile of the drum, 6 denotes a flat steel bar, 7 denotes an upper die of a pressing die, and 8 denotes a lower die of a lower pressing die;
fig. 3 is a schematic structural view of a thick tile of a large-capacity pressing drum, wherein 1 represents a longitudinal joint groove, 2 represents inner transition of the longitudinal joint groove, 3 represents outer transition of the longitudinal joint groove, and 4 represents process allowance of a longitudinal joint straight edge.
The specific implementation mode is as follows:
the first embodiment is as follows: the manufacturing method of the large-capacity pressed thick boiler barrel tile in the embodiment is characterized in that the two sides of the longitudinal seam of the thick tile are processed by utilizing the oblique process allowance, and the specific steps are as follows: firstly, gas cutting blanking, correcting and pre-planning and milling a boiler barrel thick tile steel plate blank to machine the inner side transition inclined plane of a longitudinal joint groove, wherein the inclination angle of the machined transition inclined plane is 3-8 degrees according to actual conditions, the machining length is 100-160 mm, and the process allowance of the longitudinal joint straight edge is reserved to 30
mm-38 mm, heating the boiler barrel thick tile steel plate blank, and stacking the outer edge of the blank with the thickness section of 6 × 60mm2～12×80mm2The flat steel bars are subjected to sectional point pressing, and the number of the stacked flat steel bars is 1-3 layers according to actual conditions; thirdly, cutting off the process allowance of the straight edge of the longitudinal seam of the thick boiler barrel tile by gas cutting, machining a longitudinal seam groove and a transition angle outside the longitudinal seam groove after finely correcting the thick boiler barrel tile, and machining the transition angle to be 3-8 degrees according to actual conditions.
In the embodiment, before hot press forming, the transition of the inner side of the longitudinal seam groove of the thick tile is subjected to pre-milling processing, so that the edge of the thick tile is thinned, the thick tile is easy to deform during hot press forming, an ideal bending effect is achieved, the process allowance of the longitudinal seam straight edge is further reduced, the consumption of materials is reduced, and the cost is saved; during hot press molding, 1-3 layers of flat steel bars are laid on the outer edge of the thick tile, the outer edge of the thick tile is subjected to sectional point pressing, and sectional pressing is carried out according to actual conditions, so that the thick tile can be deformed and bent uniformly through the sectional pressing; after hot press forming, when thick tiles and thin tiles are buckled and welded into a barrel body, the transition gradient on the outer side of the longitudinal seam groove is smaller, and the buckled transition part becomes gentle, so that the barrel body can rotate on the roller frame easily and the radial run-out is gentle, the transition of extra welding of a transition plate or circumferential welding near the longitudinal seam is avoided, and the manufacturing cost is reduced.
The second embodiment is as follows: the manufacturing method of the large-capacity pressed thick boiler barrel tile in the first embodiment is different from the manufacturing method of the large-capacity pressed thick boiler barrel tile in the first embodiment in that the transition angle of the inner side of the longitudinal seam groove processed by planing and milling in advance is 4-7 degrees, the processing length is 110-150 mm, and the process allowance of the straight side of the longitudinal seam is reserved to be 32-37 mm; the rest is the same as the first embodiment.
The third concrete implementation mode: the manufacturing method of the large-capacity pressed thick boiler barrel tile in the embodiment is different from the manufacturing method of the large-capacity pressed thick boiler barrel tile in the embodiment one or two, the transition angle of the inner side of the pre-planing and milling longitudinal seam groove is 5-6 degrees, the processing length is 120-140 mm, and the process allowance of the straight side of the longitudinal seam is reserved to be 34-36 mm; the others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the manufacturing method of the large-capacity pressed thick boiler barrel tile in the first, second or third embodiment is different in that the transition angle of the inner side of the pre-planing and milling longitudinal seam groove is 6 degrees, the processing length is 130mm, the process allowance of the straight edge of the longitudinal seam is reserved to 35mm, and the rest is the same as that of the first, second or third embodiment;
in the embodiment, taking the SA299 steel plate as an example, when the process allowance of the thick tile reserved longitudinal seam straight edge is reduced from 70mm to 35mm, the consumption of the SA299 steel plate material for each drum can be reduced by 2.6 tons, and the consumption of the thick tile material can be reduced by 2.6%; when the process allowance of the straight edge of the longitudinal seam of the thick tile is newly reduced to 35mm from 120mm, 6.3 tons of SA299 steel plate material consumption of each drum can be reduced, 6.3 percent of thick tile material consumption is reduced, and the economic benefit is remarkable.
The fifth concrete implementation mode: the difference between this embodiment and the first, second, third or fourth embodiment of the method for manufacturing thick tiles of large-capacity pressed drums is thatIn the second step, the thick tile steel plate blank of the heating drum is provided with a cushion on the outer edge of the blank, the thickness section of the cushion is 7 × 70mm2The flat steel bars are subjected to sectional point pressing, and the number of the stacked flat steel bars is 2; the others are the same as the first, second, third or fourth embodiments.
The sixth specific implementation mode: the manufacturing method of the high-capacity pressed thick boiler barrel tile in the first, second, third, fourth or fifth embodiment is different from the manufacturing method of the high-capacity pressed thick boiler barrel tile in that the transition angle of the outer side of the longitudinal seam groove is 4-7 degrees in the third step; the other embodiments are the same as the first, second, third, fourth or fifth embodiments.
The seventh embodiment: the manufacturing method of the high-capacity pressed thick boiler barrel tile in the embodiment is different from the manufacturing method of the high-capacity pressed thick boiler barrel tile in the first, second, third, fourth, fifth or sixth embodiment in that the transition angle of the outer side of the longitudinal seam groove is 5-6 degrees; the other embodiments are the same as the first, second, third, fourth, fifth or sixth embodiments.
The specific implementation mode is eight: the manufacturing method of the high-capacity pressed thick boiler barrel tile in the first, second, third, fourth, fifth, sixth or seventh embodiment is different from the manufacturing method of the high-capacity pressed thick boiler barrel tile in that the transition angle of the outer side of the longitudinal seam groove is 6 degrees; the other embodiments are the same as the first, second, third, fourth, fifth, sixth or seventh embodiments.
The specific implementation method nine: according to the manufacturing method of the large-capacity pressed thick boiler barrel tile, a large-capacity pressed thick boiler barrel tile structure is obtained;
in the embodiment, the material for manufacturing the thick tile can be an SA299 steel plate, a DIWA353 steel plate and other materials for manufacturing a pressing boiler drum with different thicknesses, the transition angles at two sides of the longitudinal seam of the thick tile are symmetrically processed, the process allowance of the straight edge of the longitudinal seam is reserved, and the thickness section of a flat steel bar padded on the outer edge of the thick tile is set according to the material selection.
Claims (9)
1. The manufacturing method of the large-capacity pressed thick boiler barrel tile is characterized by comprising the following specific steps:
firstly, gas cutting blanking, correcting and pre-planning and milling the inner side of a longitudinal seam groove, wherein according to the actual situation, the processing transition angle is 3-8 degrees, the processing length is 100-160 mm, and the process allowance of the straight edge of the longitudinal seam is reserved to 30-38 mm;
secondly, heating the thick tile steel plate blank of the boiler barrel, and stacking the outer edge of the blank with the thickness of 6 × 60mm and the section of 6 8960 mm2～12×80mm2The flat steel bars are subjected to sectional point pressing, and the number of the stacked flat steel bars is 1-3 layers according to actual conditions;
thirdly, cutting off the process allowance of the straight edge of the longitudinal seam of the thick boiler barrel tile, machining a longitudinal seam groove and a transition angle outside the longitudinal seam groove after finely correcting the thick boiler barrel tile, and machining the transition angle to be 3-8 degrees according to actual conditions;
the transition of the inner side of the longitudinal seam groove of the thick tile is planed and milled in advance, so that the edge of the thick tile is thinned, the thick tile is easy to deform during hot-press molding, an ideal bending effect is achieved,
the sectional pressing enables the thick tile to be deformed and bent uniformly.
2. The manufacturing method of the large-capacity pressed thick boiler barrel tile according to claim 1, wherein in the step one, the transition angle of the inner side of the longitudinal seam groove processed by the pre-planing and milling is 4-7 degrees, the processing length is 110-150 mm, and the process allowance of the straight edge of the longitudinal seam is reserved to be 32-37 mm.
3. The manufacturing method of the large-capacity pressed thick drum tile according to claim 2, wherein the transition angle of the inner side of the pre-planed and milled longitudinal seam groove is 5-6 degrees, the processing length is 120-140 mm, and the process allowance of the straight edge of the longitudinal seam is reserved to be 34-36 mm.
4. The manufacturing method of the large-capacity pressed thick drum tile according to claim 3, wherein the transition angle of the inner side of the pre-planed longitudinal seam groove is 6 degrees, the processing length is 130mm, and the process margin of the straight edge of the longitudinal seam is reserved to 35 mm.
5. The method for manufacturing large capacity pressed thick drum tile according to claim 1, wherein in the second step, the blank of heating thick drum tile steel plate is laid on the outer edge of the blank of heating thick drum tile steel plate with a thickness of 7 × 70mm in cross section2The flat steel bars are subjected to sectional point pressing, and the number of the stacked flat steel bars is 2.
6. The manufacturing method of large capacity pressed thick drum tile according to claim 1, wherein the transition angle of the outer side of the groove of the longitudinal seam is processed to be 4-7 ° in step three.
7. The manufacturing method of large capacity pressed thick drum tile according to claim 1, wherein the transition angle of the outer side of the groove of the longitudinal seam is processed in step three and is 5-6 °.
8. The method for manufacturing a large capacity pressed thick drum tile according to claim 7, wherein the transition angle outside the groove of the processed longitudinal seam is 6 °.
9. The method for manufacturing large capacity pressed drum thick tiles according to claim 1, obtaining large capacity pressed drum thick tile structures.
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| CN201811088085.8A CN109014796B (en) | 2018-09-18 | 2018-09-18 | Method for manufacturing large-capacity pressed thick boiler barrel tile |
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| CN201811088085.8A CN109014796B (en) | 2018-09-18 | 2018-09-18 | Method for manufacturing large-capacity pressed thick boiler barrel tile |
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| CN109014796B true CN109014796B (en) | 2020-07-10 |
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| CN2575405Y (en) * | 2002-05-31 | 2003-09-24 | 天津市华意保温制品有限公司 | Device for covering leaks & doweling in pipe |
| CN103286528B (en) * | 2013-05-29 | 2015-04-22 | 东方电气集团东方锅炉股份有限公司 | Processing technology for longitudinal-seam narrow-gap welding groove of thick-walled barrels |
| CN104625590A (en) * | 2013-11-12 | 2015-05-20 | 青岛旭升封头有限公司 | Boiler drum end manufacturing technology |
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| US6385841B1 (en) * | 2000-09-29 | 2002-05-14 | Advanced Cutting Technologies, Ltd. | Method and apparatus for installing steam boiler tubes |
| CN101941139A (en) * | 2010-09-02 | 2011-01-12 | 中信重工机械股份有限公司 | Welding and assembling method for huge mining mill barrel |
| CN105710603A (en) * | 2014-12-04 | 2016-06-29 | 重庆聆益机械有限公司 | Processing technology for cylindrical shell sections of pipeline |
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