CN112372249B - Process method for one-time clean material cutting and hot press molding of double-curved-surface-section furnace shell of hot blast stove - Google Patents
Process method for one-time clean material cutting and hot press molding of double-curved-surface-section furnace shell of hot blast stove Download PDFInfo
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- CN112372249B CN112372249B CN202011265332.4A CN202011265332A CN112372249B CN 112372249 B CN112372249 B CN 112372249B CN 202011265332 A CN202011265332 A CN 202011265332A CN 112372249 B CN112372249 B CN 112372249B
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- furnace shell
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
Abstract
A one-time net material cutting and hot press molding process method for a hyperboloid-segment furnace shell of a hot blast stove is characterized by comprising the following steps of: designing and manufacturing a special clamping fixture; the hyperboloid section is unfolded in a tiling way; manufacturing a test board; passing the standard blanking size of a test plate; programming and inputting standard blanking data into a numerical control cutting machine, and cutting out a standard furnace shell plate; the invention has the beneficial effects that the standard furnace shell plate is formed by hot bending, and the invention has the following beneficial effects: the method of one-time material cleaning cutting and hot bending forming is adopted, so that the construction cost and labor intensity of a heating furnace are greatly reduced, half of the manufacturing amount of the mould is saved, the manufacturing quality of the hyperboloid furnace shell can be ensured, and a good effect is brought.
Description
Technical Field
The invention relates to the technical field of manufacturing of a hyperboloid-segment furnace shell of a hot-blast stove of iron-making equipment, in particular to a one-time clean material cutting and hot-press forming process method for the hyperboloid-segment furnace shell of the hot-blast stove.
Background
The hot blast stove is one of important equipment in iron-making equipment, a top combustion type hot blast stove shell generally comprises a stove cylinder section, a stove body lower section, a transition section, a stove body upper section, a cone section, an inclined line section, a straight line section and a stove top section, wherein the cone section is partially of a hyperboloid structure, the hyperboloid is an inextensible curved surface and can only be approximately unfolded, and the reason is an important reason for difficulty in manufacturing the hyperboloid structure.
The traditional manufacturing method of the double-curved-surface section furnace shell of the hot-air furnace shell is to divide a double-curved surface into two strips at a tangent, each strip is provided with a cutting allowance according to the periphery of an unfolded furnace shell plate, the two strips are heated to a certain temperature and then are subjected to hot-press bending forming, secondary material marking and cutting are carried out, and after the strips are qualified through factory pre-installation, the strips are assembled and welded in a construction site.
With the progress of science and technology, the current advanced manufacturing method is a process method combining hot-pressing bending and all clean material cutting forming, namely, a hyperboloid is divided into two belts at a tangent, each belt is used for cutting clean materials once according to an unfolded furnace shell plate, after the materials are heated to a certain temperature, the hot-pressing bending forming is carried out, and after the factory is preassembled, a circular seam is assembled and welded on a construction site, but the problems of large manufacturing amount of a clamping fixture, large using amount of a heating furnace, high manufacturing cost, high labor intensity and low production efficiency still exist.
Disclosure of Invention
The invention provides a process method for one-time net material cutting and hot press molding of a hyperboloid section furnace shell of a hot blast furnace, which aims to solve the problems of large manufacturing amount, high manufacturing cost, high labor intensity and low production efficiency of a hyperboloid section furnace shell mold of the existing hot blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
a one-time net material cutting and hot press molding process method for a hyperboloid-segment furnace shell of a hot blast stove is characterized by comprising the following steps of:
1) according to the external dimension of the hyperboloid section furnace shell, the curvature of each curve section of the hyperboloid section furnace shell is determined, and a special mould with the cross center positioning function of the furnace shell is designed and manufactured.
2) The method comprises the following steps of unfolding the hyperboloid section in a tile-dividing manner, manufacturing a test board for hot-press bending forming, and determining the standard blanking size through the test board, wherein the method comprises the following specific steps:
a) dividing the hyperboloid section of the hot blast stove into tiles according to requirements, obtaining theoretical size data of a test piece by adopting a lofting approximate expansion method, programming and inputting the data into a numerical control cutting machine, and cutting two test plates;
b) placing the test plate into a gas heating furnace, heating to 900-1000 ℃, directly placing the test plate into a special mould for pressing, completely attaching the steel plate to the special mould during pressing, and taking out the test plate when the radian of the longitude and latitude meets the standard requirement by using a radian sample plate under the fully cooled state;
c) preassembling two test plates on a platform, measuring thermal bending deformation of the periphery of the test plates, determining compensation amount of each point according to the thermal bending deformation, and finally determining the standard blanking size of the hyperboloid furnace shell.
3) And programming and inputting the standard blanking data into a numerical control cutting machine, and cutting a standard furnace shell plate by one-time material cleaning.
4) And (3) placing the standard furnace shell plate into a gas heating furnace, heating to 900-1000 ℃, directly placing the furnace shell plate into a mold, and performing hot-press bending molding, wherein the center of the furnace shell is superposed with the cross center of the mold during placement.
The hot-press bending molding adopts a mode of point contact to surface contact for pressing.
The chord length of the radian sample plate is not less than 1.5 m.
Compared with the prior art, the invention has the beneficial effects that:
1) the material loss is small, the mold manufacturing amount is small, the heating furnace usage amount is small, the manufacturing cost is low, the labor intensity is low, and the production efficiency is high.
2) The construction cost and the labor intensity of the heating furnace are greatly reduced, the manufacturing amount of half of the mould is saved, the manufacturing quality of the furnace shell with the hyperboloid section can be ensured, and a good effect is brought.
Drawings
Fig. 1 is a schematic cross-sectional view of a double-curved surface of a hot blast stove by a process method of one-time clean material cutting and hot press molding of a double-curved surface section furnace shell.
Fig. 2 is a schematic view of the shape of the mold of the hot blast stove hyperboloid segment furnace shell once clean material cutting and hot press molding process method.
FIG. 3 is a schematic sectional view of a mold of a hot blast stove double-curved-surface-section furnace shell once clean material cutting and hot press molding process method.
Fig. 4 is a tile-divided expansion schematic diagram of the hot blast stove double-curved-surface-section furnace shell one-time clean material cutting and hot press molding process method.
FIG. 5 is a theoretical development view of the approximate development of the furnace shell of the hot blast stove by the technological method of one-time clean material cutting and hot press molding of the double-curved-surface-section furnace shell.
FIG. 6 is a standard development view of the furnace shell of the hot blast stove with the process method of one-time clean material cutting and hot press molding of the double-curved-surface-section furnace shell.
FIG. 7 is a position diagram of compensation around the furnace shell according to the process method of one-time clean material cutting and hot press molding of the double-curved-surface-section furnace shell of the hot blast furnace.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a hot-blast stove hyperboloid section stove outer covering one-time net material cutting and hot briquetting technological method, the hot-blast stove hyperboloid section stove outer covering one-time net material cutting and hot briquetting technological method include the following steps:
1) as shown in fig. 2 and 3, the curvature of each curve segment of the hyperboloid segment furnace shell is determined according to the external dimension of the hyperboloid segment furnace shell, a special mould with the cross center positioning of the furnace shell is designed and manufactured, the design radius of the special mould is slightly larger than the theoretical radius, and the furnace shell is easy to form and has good forming quality when hot-press bending is ensured.
2) As shown in fig. 4, 5, 6 and 7, the hyperboloid segment is tiled and unfolded to manufacture a test board for hot-press bending forming, the standard blanking size is determined through the test board, the hot-press bending forming test board is manufactured through the hyperboloid segment segmented tiling and unfolding, the test board can be closer to the actual size of the furnace shell, and the final standard blanking size conforms to the actual size of the furnace shell with the hyperboloid segment through correction compensation, and the method comprises the following specific steps:
a) as shown in fig. 4 and 5, dividing the hyperboloid section of the hot blast stove into tiles according to requirements, wherein the number of the divided tiles is in accordance with the change of curvature radius, obtaining theoretical size data of a test piece by adopting a lofting approximate expansion method, programming and inputting the data into a numerical control cutting machine, and cutting two experimental plates;
b) placing the test board into a gas heating furnace, heating to 900-1000 ℃, directly placing the test board into a special mould for pressing, completely attaching the steel board to the special mould during pressing, and taking out the test board when the radian of the longitude and latitude meets the standard requirements by using a radian sample plate under the fully cooled state, wherein the radian sample plate corrects whether the curvature radius of the test board meets the requirements or not, and whether the test board is tightly attached to the special mould or not;
c) as shown in fig. 6 and 7, two test plates are preassembled on a platform, the thermal bending deformation amount around the test plates is measured, the compensation amount of each point is determined according to the thermal bending deformation amount, the standard blanking size of the hyperboloid section furnace shell is finally determined, the variation amount of the thermal bending can be directly measured through preassembling, then the final compensation amount of different curvature compensation points is determined, and the standard blanking size of the hyperboloid section furnace shell is manufactured.
3) And programming and inputting the standard blanking data into a numerical control cutting machine, and cutting a standard furnace shell plate by one-time material cleaning.
4) The standard furnace shell plate is placed into a gas heating furnace and heated to 900-1000 ℃, and then is directly placed into a mold for hot-press forming, when the standard furnace shell plate is placed, the center of the furnace shell is superposed with the cross center of the mold, the standard furnace shell plate is subjected to hot-press forming, and a special mold is pressed in, so that the standard furnace shell is subjected to hot-press forming at one time, the complex checking procedure is saved, the workload for manufacturing the furnace shell is reduced, and the material consumption of the furnace shell is saved.
As shown in fig. 2 and 3, the hot-press bending molding adopts a mode of point contact to surface contact for pressing, so that the furnace shell plate is completely attached to the mold and is fully cooled, the furnace shell is completely attached to the mold in the hot-press bending molding, and the attachment rate can be ensured by adopting point-to-surface transition hot-press bending.
The chord length of the radian sample plate is not less than 1.5m, in order to ensure the final preassembly quality of the double-sided section, the furnace shell formed by hot-press bending needs to be checked in the warp and weft directions by the radian sample plate with the chord length not less than 1.5m in a fully cooled state, and the gap between the sample plate and the furnace shell meets the standard requirement.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the transformation of Lingyuan steel and iron with the size of 2300m3The experimental research is carried out in the manufacture of the hyperboloid section furnace shell of the blast furnace engineering hot blast stove, and the process flow is as follows: dividing the double-curved-surface-section furnace shell into tiles → approximately unfolding the single tile → numerical control cutting testTesting plates → hot-press forming and full cooling of the testing plates → measuring the deformation of the periphery → processing the data to obtain the standard expansion size → numerically controlling and cutting the standard furnace shell plate → hot-press forming the standard furnace shell.
As shown in figure 1, the hyperboloid section of the hot blast stove is divided into tiles according to requirements to obtain a cross-sectional view of a single-section furnace shell.
The theoretical dimensions of the test piece were obtained using an approximate unfolding method, as shown in fig. 5.
These data were programmed into a numerically controlled cutting machine and two test panels were cut. And (3) placing the test board into a gas heating furnace, heating to 900-1000 ℃, directly placing the test board into a mould for pressing, and taking out the test board after fully cooling.
As shown in fig. 6 and 7, two test plates are preassembled on a platform, the thermal bending deformation amount around the test plates is measured, the compensation amount of each point is determined according to the thermal bending deformation amount, and finally the standard blanking size of the hyperboloid furnace shell is determined.
Fig. 7 is a four-side compensation amount position diagram, and specific values of theoretical coordinates, standard coordinates, and compensation amounts thereof are shown in table 1.
TABLE 1
And programming and inputting the standard blanking data into a numerical control cutting machine, and cutting a standard furnace shell plate by one-time material cleaning.
And (2) putting the standard furnace shell plate into a gas heating furnace, heating to 900-1000 ℃, directly putting the furnace shell plate into a mould, carrying out hot-press bending molding, fully cooling, wherein the curvature radius of the mould is close to that of the furnace shell, and pressing in a point-to-surface contact mode in the hot-press bending process to finally achieve complete lamination with the mould.
In order to ensure the final pre-installation quality of the hyperboloid section, the furnace shell formed by hot bending needs to be inspected in the warp and weft directions by using a radian sample plate with the chord length not less than 1.5m in a fully cooled state, and the gap between the sample plate and the furnace shell meets the standard requirement.
When the method is used, a one-time material cleaning cutting and hot-press bending forming method is adopted, so that the construction cost and labor intensity of a heating furnace are greatly reduced, half of the manufacturing amount of the mould is saved, the manufacturing quality of the double-curved-surface-section furnace shell can be ensured, and a good effect is brought.
Claims (2)
1. A one-time net material cutting and hot press molding process method for a hyperboloid-segment furnace shell of a hot blast stove is characterized by comprising the following steps of:
1) determining the curvature of each curve segment of the hyperboloid segment furnace shell according to the external dimension of the hyperboloid segment furnace shell, and designing and manufacturing a hot-press molding mould of the hyperboloid segment furnace shell of the hot-blast stove with the cross center positioning of the furnace shell;
2) the method comprises the following steps of unfolding the hyperboloid section in a tile-dividing manner, manufacturing a test board for hot-press bending forming, and determining the standard blanking size through the test board, wherein the method comprises the following specific steps:
a) dividing the hyperboloid section of the hot blast stove into tiles according to requirements, lofting by adopting an approximate expansion method to obtain theoretical size data of the test board, programming and inputting the data into a numerical control cutting machine, and cutting the two test boards;
b) placing the test boards into a gas heating furnace, heating to 900-1000 ℃, directly placing the test boards into a hot-blast stove hyperboloid furnace shell hot-press molding mould for pressing, pressing the hot-press molding by adopting a mode of point contact transition to surface contact, completely attaching the two test boards and the hot-press molding mould of the hot-blast stove hyperboloid furnace shell, and taking out the test boards when the radian of the longitude and latitude lines meets the standard requirement by using a radian sample board in a fully cooled state;
c) preassembling two test plates on a platform, measuring thermal bending deformation around the test plates, determining compensation amount of each point according to the thermal bending deformation, and finally determining the standard blanking size of the hyperboloid furnace shell;
3) programming and inputting standard blanking data into a numerical control cutting machine, and cutting a whole standard furnace shell plate by one-time material cleaning;
4) and (2) placing the whole standard furnace shell plate into a gas heating furnace, heating to 900-1000 ℃, directly placing the standard furnace shell plate into a mold, and performing hot-press bending molding, wherein after the standard furnace shell plate is fully cooled, the center of the furnace shell is superposed with the cross center of the mold during placement, and hot-press molding of the hyperbolic furnace shell of the hot-blast furnace is completed at one time.
2. The process method for one-time net material cutting and hot press forming of the hyperboloid shell of the hot blast stove according to claim 1, characterized in that the chord length of the radian sample plate is not less than 1.5 m.
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| CN202011265332.4A CN112372249B (en) | 2020-11-13 | 2020-11-13 | Process method for one-time clean material cutting and hot press molding of double-curved-surface-section furnace shell of hot blast stove |
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| CN202011265332.4A CN112372249B (en) | 2020-11-13 | 2020-11-13 | Process method for one-time clean material cutting and hot press molding of double-curved-surface-section furnace shell of hot blast stove |
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| CN112372249B true CN112372249B (en) | 2022-05-10 |
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| CN1689723A (en) * | 2004-04-21 | 2005-11-02 | 渤海船舶重工有限责任公司 | Double curvature plate cold press forming method and equipment thereof |
| CN101318279A (en) * | 2007-06-08 | 2008-12-10 | 鞍钢建设集团有限公司 | One-time material clearing hot press molding process for circular arc zone of furnace jacket of blast furnace hot blast stove |
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| UA91826U (en) * | 2014-04-28 | 2014-07-10 | Юрій Геннадійович Галянт | Method of manufacturing radiator section |
| CN104439972A (en) * | 2014-11-25 | 2015-03-25 | 鞍钢重型机械有限责任公司 | Manufacturing method for planing large converter into two segments |
| CN104561422A (en) * | 2015-01-27 | 2015-04-29 | 鞍钢建设集团有限公司 | Method for cutting and cold press molding spherical furnace shell of hot blast furnace by one time |
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2020
- 2020-11-13 CN CN202011265332.4A patent/CN112372249B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1689723A (en) * | 2004-04-21 | 2005-11-02 | 渤海船舶重工有限责任公司 | Double curvature plate cold press forming method and equipment thereof |
| CN101318279A (en) * | 2007-06-08 | 2008-12-10 | 鞍钢建设集团有限公司 | One-time material clearing hot press molding process for circular arc zone of furnace jacket of blast furnace hot blast stove |
| CN101653791A (en) * | 2008-08-20 | 2010-02-24 | 鞍钢重型机械有限责任公司 | Converter-shell varied arc-segment hot compacting positioner and positioner manufacturing method |
| UA91826U (en) * | 2014-04-28 | 2014-07-10 | Юрій Геннадійович Галянт | Method of manufacturing radiator section |
| CN104439972A (en) * | 2014-11-25 | 2015-03-25 | 鞍钢重型机械有限责任公司 | Manufacturing method for planing large converter into two segments |
| CN104561422A (en) * | 2015-01-27 | 2015-04-29 | 鞍钢建设集团有限公司 | Method for cutting and cold press molding spherical furnace shell of hot blast furnace by one time |
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