CN113333468B - Unfolding and correcting process of cylindrical extruded wallboard - Google Patents
Unfolding and correcting process of cylindrical extruded wallboard Download PDFInfo
- Publication number
- CN113333468B CN113333468B CN202110643066.2A CN202110643066A CN113333468B CN 113333468 B CN113333468 B CN 113333468B CN 202110643066 A CN202110643066 A CN 202110643066A CN 113333468 B CN113333468 B CN 113333468B
- Authority
- CN
- China
- Prior art keywords
- wallboard
- cylindrical
- hot rolling
- temperature
- extruded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000008569 process Effects 0.000 title claims abstract description 59
- 238000005098 hot rolling Methods 0.000 claims abstract description 57
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 229910052786 argon Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000000630 rising effect Effects 0.000 claims description 14
- 238000002407 reforming Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000000399 orthopedic effect Effects 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 abstract description 49
- 238000007493 shaping process Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000004321 preservation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- SFMJNHNUOVADRW-UHFFFAOYSA-N n-[5-[9-[4-(methanesulfonamido)phenyl]-2-oxobenzo[h][1,6]naphthyridin-1-yl]-2-methylphenyl]prop-2-enamide Chemical compound C1=C(NC(=O)C=C)C(C)=CC=C1N1C(=O)C=CC2=C1C1=CC(C=3C=CC(NS(C)(=O)=O)=CC=3)=CC=C1N=C2 SFMJNHNUOVADRW-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
-
- 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
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
- B21B2045/006—Heating the product in vacuum or in inert atmosphere
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a cylindrical extrusion wallboard unfolding and correcting process, which particularly relates to the technical field of extrusion processes, wherein a vacuum hot rolling mill is adopted in the flattening process of a cylindrical piece, so that the situation that the difference of residual stress inside and outside the extrusion wallboard is overlarge in the hot rolling unfolding process of the extrusion wallboard can be avoided, the smooth stability of the extrusion wallboard unfolding process is ensured, the unfolding of the extrusion wallboard is completed in a hot rolling manner, the adjustment and shaping of different positions of each wall thickness of the extrusion wallboard can be realized, the rolling can be performed in a high-temperature environment, the internal stress can be reduced to a certain extent, the internal stress of the extrusion wallboard after the unfolding is completed reaches an equilibrium state, after the flattening of the extrusion wallboard is completed by slowly reducing the temperature, the temperature of the extrusion wallboard in the correcting process is smaller than the room temperature difference, the situation that the stress balance caused by the temperature in the correcting process is broken can be avoided, and the unfolding and correcting process of the extrusion wallboard are smoothly and accurately performed.
Description
Technical Field
The invention relates to the technical field of extrusion processes, in particular to a process for unfolding and correcting a cylindrical extrusion wall plate.
Background
The high-strength steel plate (particularly a high-strength thin plate) which is straightened at a high temperature has poor shape and dimensional accuracy retention, and the steel plate which is straightened and qualified at a hot state is often subjected to shape degradation after being cooled, namely the defects of bow back, buckling, square off and the like, and even the product degradation and waste judgment are caused. The problem is generally not known correctly in the process of flattening in a steel mill at present, and the defect of the plate shape is often mistakenly considered to be caused by external force of the steel plates in the links of stacking, hoisting, transporting and the like.
The negative effect of temperature on the shape of the sheet is particularly pronounced on high strength sheets, which may be due to two: firstly, there is significant uneven cooling; secondly, the nonlinear change of the mechanical property of the steel along with the temperature damages the stress balance to cause the instability of the plane structure. The method has the advantages that the method shows an obvious nonlinear relation between mechanical property parameters of carbon steel and low alloy steel below 200 ℃ and temperature, the straightening reduction of high-strength steel is large, the temperature of the steel plate is increased by 10-20 ℃ after the steel plate is strongly straightened, so that the thermal straightening temperature can reach about 220 ℃, the influence of the nonlinear change of the mechanical property of the material along with the temperature on the internal stress balance state of the thin-specification steel plate can not be ignored in the process of cooling the steel plate to room temperature, the internal stress of part of the plate is always in a critical balance state after the plate is leveled in a thermal state, the internal stress obeys the basic material mechanical law, the stress balance in the thermal state is not balanced in a cold state, the critical stress balance of the whole or partial area can be damaged by small-amplitude mechanical property nonlinear change to generate unbalanced force, the thin-specification steel plate is used as a thin-wall large-plane structure, the stability of the thin-specification steel plate is poor, the instability easily occurs, and the stress causing structural instability can be far lower than the elastic plastic deformation limit of the material, and the plane structure instability caused under the unbalanced force effect is an important factor of the deterioration of the plate after the thermal straightening cooling.
In the prior art, the cylindrical part has the phenomena of unbalanced stress and uneven wall thickness in the cylindrical part after extrusion molding due to the fluidity of metal in the extrusion molding process, and simultaneously, the internal stress of the cylindrical part is reduced by heating in the straightening process after the cylindrical part is flattened, so that the straightening is carried out, but the stress balance state in the cylindrical part after the straightening in the thermal state is broken after the cylindrical part enters a cooling state, so that the cooled cylindrical part has certain deformation, the expansion and straightening effects of the extrusion wallboard are influenced, and therefore, the expansion and straightening process of the cylindrical extrusion wallboard is needed to solve the problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a process for unfolding and correcting a cylindrical extruded wallboard, which aims to solve the technical problems that: the internal stress of the cylindrical part is unbalanced and the wall thickness is uneven after the cylindrical part is extruded and formed, and meanwhile, the internal stress of the cylindrical part is reduced by heating in the straightening process part after the cylindrical part is flattened, so that the cylindrical part is straightened, but after the cylindrical part in a hot state is straightened, the stress balance state in the cylindrical part can be broken after the cylindrical part enters a cooling state, so that the cooled cylindrical part is deformed to a certain extent, and the expansion and straightening effects of the extruded wallboard are affected.
In order to achieve the above purpose, the present invention provides the following technical solutions: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 14-18min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
As a further aspect of the invention: and when the high-pressure water in the step S2 washes the surface of the cylindrical part, the high-pressure water pressure is 330bar.
As a further aspect of the invention: in the cooling process in the step S3, the cooling speed is kept at 25 ℃/min.
As a further aspect of the invention: the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener in the step S4 is, the better.
As a further aspect of the invention: and after argon is introduced into the vacuum hot rolling mill in the step S3, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
The invention has the beneficial effects that:
1. according to the invention, a vacuum hot rolling mill is adopted in the flattening process of the cylindrical part, argon is introduced after the vacuum hot rolling mill is vacuumized, so that the cylindrical part can be prevented from being unfolded and hot rolled into the extrusion wallboard in a high-temperature environment, the deformation resistance of the extrusion wallboard can be reduced along with the high-temperature rise, the stress generated in the production process of the extrusion wallboard is gradually eliminated, the cylindrical part is easier to be unfolded and shaped, meanwhile, the cooling process adopts a slower cooling speed, the situation that the difference between the internal temperature and the external temperature of the extrusion wallboard is overlarge due to rapid cooling can be avoided, the situation that the difference between the internal temperature and the external temperature of the extrusion wallboard is overlarge in the hot rolling unfolding process can be avoided, the smooth stability of the expansion process of the extrusion wallboard can be ensured, the expansion of the extrusion wallboard can be ensured to be realized in a hot rolling mode, the adjustment and shaping of different positions of the extrusion wallboard can be ensured, the internal stress of the extrusion wallboard can be reduced to a certain extent, the internal stress of the extrusion wallboard after the expansion is enabled to reach a balanced state, the flattening process is carried out slowly after the extrusion wallboard is cooled, the correction process is carried out, the situation that the difference between the temperature of the extrusion wallboard and the temperature of the extrusion wallboard is small, and the expansion process is avoided due to the fact that the expansion process is accurate and the stress is avoided;
2. the dephosphorization operation is carried out before the split cylindrical part is unfolded, the dephosphorization process uses the dephosphorization machine to control the water pressure to be 330bar to wash and clean the surface oxide skin of the cylindrical part, so that the surface oxide skin of the cylindrical part can be effectively reduced, the condition that the oxide skin is extruded into the extrusion wallboard in the subsequent hot rolling unfolding process of the cylindrical part is avoided, and the influence of the oxide skin on the processing process of the extrusion wallboard is reduced.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 14min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
And S2, when the high-pressure water washes the surface of the cylindrical member, the high-pressure water pressure is 330bar.
In the cooling process in S3, the cooling speed is kept at 25 ℃/min.
S4, the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener is, the better.
And S3, after argon is introduced into the vacuum hot rolling mill, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
Example 2: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 15min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
And S2, when the high-pressure water washes the surface of the cylindrical member, the high-pressure water pressure is 330bar.
In the cooling process in S3, the cooling speed is kept at 25 ℃/min.
S4, the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener is, the better.
And S3, after argon is introduced into the vacuum hot rolling mill, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
Example 3: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 16min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
And S2, when the high-pressure water washes the surface of the cylindrical member, the high-pressure water pressure is 330bar.
In the cooling process in S3, the cooling speed is kept at 25 ℃/min.
S4, the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener is, the better.
And S3, after argon is introduced into the vacuum hot rolling mill, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
Example 4: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 17min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
And S2, when the high-pressure water washes the surface of the cylindrical member, the high-pressure water pressure is 330bar.
In the cooling process in S3, the cooling speed is kept at 25 ℃/min.
S4, the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener is, the better.
And S3, after argon is introduced into the vacuum hot rolling mill, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
Example 5: a process for expanding and reforming a cylindrical extruded panel comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, and then placing the cut cylinder partRolling and flattening the split cylindrical part in a vacuum hot rolling mill, then controlling the temperature to be 650 ℃, preserving the heat for 18min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
And S2, when the high-pressure water washes the surface of the cylindrical member, the high-pressure water pressure is 330bar.
In the cooling process in S3, the cooling speed is kept at 25 ℃/min.
S4, the smaller the temperature difference between the self temperature of the extruded wallboard and the working environment temperature of the strong straightener is, the better.
And S3, after argon is introduced into the vacuum hot rolling mill, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
The following table is derived according to examples 1-5:
| time to keep warm (min) | Resilience (mm) | Residual stress (MPa) | |
| Example 1 | 14 | 3.1 | 4.8 |
| Example 2 | 15 | 1.8 | 3.2 |
| Example 3 | 16 | 0.6 | 2.3 |
| Example 4 | 17 | 0 | 1.6 |
| Example 5 | 18 | 0 | 1.5 |
From the comparison in the table above, it can be seen that: in the stable heat preservation stage of hot rolling expansion process, keep the temperature at 650 ℃, along with the increase of heat preservation time, the resilience of extrusion wallboard gradually reduces, and when the heat preservation time is 17min, the resilience of extrusion wallboard is 0mm, and along with the increase of heat preservation time, the residual stress of extrusion wallboard section gradually reduces, and when the heat preservation time is 17min, the residual stress reduction rate of extrusion wallboard is extremely slow, and the elimination rate of the residual stress of continuous heat preservation is not in direct proportion to energy consumption, so can judge that when the heat preservation temperature is 650 ℃, the heat preservation time is 17min, and the resilience and the residual stress state of extrusion wallboard are most ideal.
The method can be summarized as follows: in the present invention,
according to the invention, a vacuum hot rolling mill is adopted in the flattening process of the cylindrical part, argon is introduced after the vacuum hot rolling mill is vacuumized, so that the cylindrical part can be prevented from being subjected to expansion hot rolling in a high-temperature environment to form a strong oxidation phenomenon, the temperature is increased, the deformation resistance of the extrusion wallboard can be reduced along with the expansion hot rolling process, the stress generated in the extrusion wallboard production process is gradually eliminated, the alloy is easier to be expanded and shaped, meanwhile, the cooling process adopts a slower cooling speed, the situation that the internal and external temperature difference of the extrusion wallboard is overlarge due to rapid cooling can be avoided, the situation that the internal and external residual stress difference of the extrusion wallboard is overlarge in the hot rolling expansion process can be avoided, the smooth stabilization of the expansion process of the extrusion wallboard can be ensured, the expansion of the extrusion wallboard can be ensured to be realized in a mode, the adjustment and shaping of different wall thicknesses of the extrusion wallboard can be realized, the rolling can be performed in a high-temperature environment to a certain extent, the internal stress of the extrusion wallboard can be reduced to reach a balanced state after the expansion is slowly cooled, the flattening process is performed, the correction is performed on the extrusion wallboard, the situation that the temperature difference between the temperature and the temperature difference between the extrusion wallboard and the temperature is small is avoided, and the expansion process is accurate due to the fact that the expansion process is avoided.
The dephosphorization operation is carried out before the split cylindrical part is unfolded, the dephosphorization process uses the dephosphorization machine to control the water pressure to be 330bar to wash and clean the surface oxide skin of the cylindrical part, so that the surface oxide skin of the cylindrical part can be effectively reduced, the condition that the oxide skin is extruded into the extrusion wallboard in the subsequent hot rolling unfolding process of the cylindrical part is avoided, and the influence of the oxide skin on the processing process of the extrusion wallboard is reduced.
The last points to be described are: while the invention has been described in detail in the foregoing general description and with reference to specific embodiments, the foregoing embodiments are merely illustrative of the technical aspects of the invention and are not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. A process for expanding and reforming a cylindrical extruded panel, comprising the steps of:
s1, finishing and splitting: cleaning the surface of the extruded cylindrical part, finishing, heating the cylindrical part to 650 ℃, cutting the obtained cylindrical part along the axis, and naturally cooling;
s2, surface treatment; firstly, dephosphorizing the cut cylindrical piece, putting the cylindrical piece into a dephosphorization machine, controlling high-pressure water to wash the surface of the cylindrical piece, and completely removing oxide skin on the surface of the cylindrical piece;
s3, flattening: vacuumizing the interior of the vacuum hot rolling mill to be less than or equal toPa, introducing argon into a vacuum hot rolling mill, then placing the split cylinder into the vacuum hot rolling mill, rolling and flattening the split cylinder, then controlling the temperature to be 650 ℃, preserving heat for 14-18min, and then cooling to obtain an expanded extruded wallboard;
s4, orthopedic: and (3) putting the extruded wallboard into a strong straightener for straightening treatment, and finally obtaining the straightened extruded wallboard.
2. The process for expanding and reforming a cylindrical extruded panel according to claim 1, wherein: and when the high-pressure water in the step S2 washes the surface of the cylindrical part, the high-pressure water pressure is 330bar.
3. The process for expanding and reforming a cylindrical extruded panel according to claim 1, wherein: in the cooling process in the step S3, the cooling speed is kept at 25 ℃/min.
4. The process for expanding and reforming a cylindrical extruded panel according to claim 1, wherein: the smaller the temperature difference between the self temperature of the S4 extruded wallboard and the working environment temperature of the strong straightener is, the better.
5. The process for expanding and reforming a cylindrical extruded panel according to claim 1, wherein: and after argon is introduced into the vacuum hot rolling mill in the step S3, the vacuum hot rolling mill needs to be heated, the temperature rising speed in the heating process of the vacuum hot rolling mill is 10-25 ℃/min, and the temperature rising speed is kept low, so that the temperature difference between the inside and the outside of the extruded wallboard can be prevented from being large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643066.2A CN113333468B (en) | 2021-06-09 | 2021-06-09 | Unfolding and correcting process of cylindrical extruded wallboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643066.2A CN113333468B (en) | 2021-06-09 | 2021-06-09 | Unfolding and correcting process of cylindrical extruded wallboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113333468A CN113333468A (en) | 2021-09-03 |
| CN113333468B true CN113333468B (en) | 2023-08-25 |
Family
ID=77475809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110643066.2A Active CN113333468B (en) | 2021-06-09 | 2021-06-09 | Unfolding and correcting process of cylindrical extruded wallboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113333468B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042779B (en) * | 2021-11-30 | 2023-10-03 | 一重集团大连工程技术有限公司 | Integral extrusion forming aluminum alloy cylinder flattening process with rib plates |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070448A (en) * | 1993-10-01 | 2000-06-06 | Daimlerchrysler Ag | Method of using profiles, and producing metal sheets with stepped cross-sections and different wall thicknesses |
| DE102008048496A1 (en) * | 2008-09-23 | 2010-04-01 | Peter Stolfig | Sheet metal molded part manufacturing method, involves forming flat body into component using processing technologies, discharging component from processing zone, and cooling component at room temperature |
| CN103273274A (en) * | 2013-06-07 | 2013-09-04 | 中北大学 | Forming method for magnesium alloy boards |
| CN109277422A (en) * | 2018-10-10 | 2019-01-29 | 江苏亿和新材料有限公司 | A kind of high muscle thin-walled plate of 7xxx line aluminium alloy wide cut and its extrusion forming method |
| CN110900120A (en) * | 2019-10-30 | 2020-03-24 | 太原科技大学 | Integral forming method of wide-width high-rib thin-wall metal wall plate |
| CN112207522A (en) * | 2020-10-26 | 2021-01-12 | 许晨玲 | Flatness control method for large aluminum alloy integral wall plate |
-
2021
- 2021-06-09 CN CN202110643066.2A patent/CN113333468B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070448A (en) * | 1993-10-01 | 2000-06-06 | Daimlerchrysler Ag | Method of using profiles, and producing metal sheets with stepped cross-sections and different wall thicknesses |
| DE102008048496A1 (en) * | 2008-09-23 | 2010-04-01 | Peter Stolfig | Sheet metal molded part manufacturing method, involves forming flat body into component using processing technologies, discharging component from processing zone, and cooling component at room temperature |
| CN103273274A (en) * | 2013-06-07 | 2013-09-04 | 中北大学 | Forming method for magnesium alloy boards |
| CN109277422A (en) * | 2018-10-10 | 2019-01-29 | 江苏亿和新材料有限公司 | A kind of high muscle thin-walled plate of 7xxx line aluminium alloy wide cut and its extrusion forming method |
| CN110900120A (en) * | 2019-10-30 | 2020-03-24 | 太原科技大学 | Integral forming method of wide-width high-rib thin-wall metal wall plate |
| CN112207522A (en) * | 2020-10-26 | 2021-01-12 | 许晨玲 | Flatness control method for large aluminum alloy integral wall plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113333468A (en) | 2021-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103978032B (en) | A kind of processing method of fine crystalline superplastic TA15 titanium-alloy thin-plate | |
| CN109848212B (en) | Stainless steel strip and rolling method thereof | |
| CN111922078B (en) | Production method of high-strength thick steel plate with yield strength of more than or equal to 370MPa | |
| CN113333468B (en) | Unfolding and correcting process of cylindrical extruded wallboard | |
| CN102787286B (en) | Molding method of (2A12-T4) high-strength aluminum alloy thin-wall irregular cavity | |
| CN111644462A (en) | Preparation method of Gr23 titanium alloy wire for powder making | |
| CN113305188B (en) | Cold stretch bending forming method for titanium alloy thin-wall section | |
| CN106917057A (en) | A kind of processing method of the residual stress for eliminating light alloy material | |
| CN106636747A (en) | Manufacturing method for producing commercial pure titanium plate by adopting double annealing of heavy and medium plate mill | |
| CN112692065A (en) | High-strength thin-wall stainless steel hexagonal seamless tube and manufacturing method thereof | |
| CN107866660A (en) | A kind of die steel processing technology | |
| CN101791244A (en) | Processing method of pure titanium curved plate used as body implant | |
| CN111438318A (en) | Thin-wall high-strength titanium alloy pipe and preparation method thereof | |
| CN117245045A (en) | Forging method of large-size Ti80 titanium alloy forging stock | |
| CN106064221B (en) | A kind of forging technology of GCr15 rollers set | |
| CN104531969B (en) | Heat treatment method for reducing automobile insert deformation | |
| CN115386819B (en) | Aging and impact temperature control method for ultra-high strength titanium alloy | |
| CN110038898B (en) | 1500 MPa-level hot forming high-strength steel production process | |
| CN114192694B (en) | Forming process method of large hyperboloid profile part | |
| CN109622846A (en) | A kind of forging method improving mould steel volume recovery | |
| CN111575464B (en) | Method for improving surface hardening layer of austenitic stainless steel | |
| CN113909414A (en) | Preparation method of tantalum target blank | |
| CN113151757A (en) | Method for eliminating annealing wrinkle of aluminum alloy strip | |
| CN107363093A (en) | Thin-specification steel plate rolling method for improving shape of intermediate billet before rolling | |
| CN107225176A (en) | A kind of method for being used to shape the sagging structure of 7075 aluminium alloy extrusions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240910 Address after: 433200 Jinghan Avenue, Honghu Xintan Cooperation Zone, Wuhan Economic and Technological Development Zone, Jingzhou City, Hubei Province Patentee after: Hubei Xiangrun New Materials Technology Co.,Ltd. Country or region after: China Address before: 436000 d6-2-1, Optical Valley United Technology City, Gaoxin Third Road, Gedian Development Zone, Ezhou City, Hubei Province Patentee before: HUBEI MEIKE JINGYI TECHNOLOGY CO.,LTD. Country or region before: China |