CN115591993A - Method for eliminating ferrite stainless steel wrinkles on outer wall formed by composite board punch forming - Google Patents
Method for eliminating ferrite stainless steel wrinkles on outer wall formed by composite board punch forming Download PDFInfo
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- CN115591993A CN115591993A CN202211350698.0A CN202211350698A CN115591993A CN 115591993 A CN115591993 A CN 115591993A CN 202211350698 A CN202211350698 A CN 202211350698A CN 115591993 A CN115591993 A CN 115591993A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 64
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 17
- 230000037303 wrinkles Effects 0.000 title claims description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 47
- 239000011324 bead Substances 0.000 claims abstract description 33
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 18
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000011282 treatment Methods 0.000 claims abstract description 9
- 230000001050 lubricating effect Effects 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000005461 lubrication Methods 0.000 claims abstract description 3
- 230000007704 transition Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 14
- 239000000463 material Substances 0.000 description 18
- 238000004080 punching Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 238000002360 preparation method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- 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
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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
-
- 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
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a method for eliminating corrugation of ferritic stainless steel on the outer wall of a composite board formed by stamping. The method of the invention comprises the following steps: s1: manufacturing an austenitic stainless steel plate, an aluminum alloy plate and a ferritic stainless steel plate subjected to multiple rolling and annealing treatments into a composite plate, and cutting the composite plate to obtain a blank; s2: symmetrically arranging draw beads on two sides of the male die in the rolling vertical direction, and adjusting the edge fillet radius of the female die to prepare a die; s3: and (3) lubricating the surfaces of the blank and the die, and then placing the blank on the die for punch forming after lubrication to obtain a stamping part with the ferrite stainless steel plate as the outer wall. The method can solve the quality problem that the ferritic stainless steel on the outer wall generates wrinkling in the composite board stamping forming process, and improves the surface quality of the stamping part.
Description
Technical Field
The invention relates to the technical field of punch forming, in particular to a method for eliminating corrugation of ferrite stainless steel on the outer wall of a composite board punch forming.
Background
The composite material has the advantages of both base material and clad material, such as three-layer composite plate made of SUS 304, al1050 and SUS430, wherein SUS 304 is austenitic stainless steel and SUS430 is ferritic stainless steel, and the composite plate has the advantages of high strength and rigidity of SUS 304, wear resistance, low price of SUS430, pitting corrosion resistance and slit corrosion resistance, low aluminum density of the clad material, good heat conduction effect and the like. Under the condition of meeting the use requirement, compared with the pure stainless steel plate, the composite plate can save 70-80% of alloy elements such as Cr, ni and the like, thereby saving 30-50% of cost, greatly saving stainless steel materials, obviously reducing the material cost of various equipment, having stronger price and market advantage and further leading the composite material to be widely applied.
The punch forming is a common production process in modern manufacturing, the composite board is cut and then subjected to punch forming, and the composite board is a main processed object of the punch forming. As the production amount, the usage amount, and the demand amount of various products using the composite board are increasing, ferritic stainless steel represented by SUS430 is also increasingly used in the composite board. However, in the punching process of these composite plates, if the outer wall of the punched part is made of SUS430 ferritic stainless steel, the surface of the material is prone to wrinkle, and the wrinkle problem has the following effects on the punched part after punching: 1) The surface quality of the stamping part is not good and does not reach the standard; 2) The material stacking and wrinkling phenomena in the stamping forming process can cause die abrasion and reduce the service life of the die; 3) One polishing process is additionally introduced in the production process to remove surface wrinkles, so that the labor and production cost are increased. Therefore, the problem of wrinkling of the ferritic stainless steel on the outer wall formed by punching the composite board needs to be solved urgently.
At present, the existing solution to the problem of wrinkling of single ferritic stainless steel in stamping molding is mainly to optimize and change the rolling method for producing ferritic stainless steel plates, for example, to adopt asynchronous rolling mode for cold rolling, control the asynchronous rolling differential speed ratio and rolling reduction, and anneal the steel plates obtained by asynchronous rolling and cold rolling. For another example, the ferritic stainless steel with specific element (such as Nb, ti, mn, si, P, cr and the like) content is selected, the cast blank is subjected to hot rolling annealing and acid cleaning after being smelted and cast into a blank, then the cast blank is subjected to multi-pass lubrication-free cold rolling, and is subjected to heat preservation at 860-940 ℃ for 1-4min for recrystallization annealing, and then the steel is discharged from a furnace for air cooling. The mode has a certain effect on solving the problem of wrinkling of the pure ferritic stainless steel in the stamping process, but cannot solve the problem of wrinkling of the ferritic stainless steel on the outer wall of the composite plate in the stamping process.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for eliminating wrinkling of ferritic stainless steel on the outer wall of composite plate punch forming, which can solve the quality problem that wrinkling is generated on the ferritic stainless steel along different rolling directions in the composite plate punch forming process, and improves the surface quality of a stamping part.
The invention provides a method for eliminating wrinkles of ferritic stainless steel on the outer wall of a composite board formed by stamping, which comprises the following steps:
s1: manufacturing an austenitic stainless steel plate, an aluminum alloy plate and a ferritic stainless steel plate subjected to multiple rolling and annealing treatments into a composite plate, and cutting the composite plate to obtain a blank;
s2: symmetrically arranging draw beads on two sides of the male die in the rolling vertical direction (namely the vertical direction of the rolling direction), and adjusting the edge fillet radius of the female die to prepare a die;
s3: and (3) lubricating the surfaces of the blank and the die, and then placing the blank on the die for punch forming after lubrication to obtain a stamping part with the ferrite stainless steel plate as the outer wall.
In the present invention, the material of the austenitic stainless steel plate is SUS 304, the material of the aluminum alloy plate is Al1050, and the material of the ferritic stainless steel plate is SUS 430; it is understood that the austenitic stainless steel plate, the aluminum alloy plate and the ferritic stainless steel plate subjected to the multiple rolling and annealing treatment can be manufactured into the composite plate by a conventional manner such as rolling, and the aluminum alloy plate in the composite plate is positioned between the austenitic stainless steel plate and the ferritic stainless steel plate.
The invention does not strictly limit the multiple rolling and annealing treatment process of the ferrite stainless steel plate; specifically, the temperature of the annealing treatment is 855-865 ℃, for example 860 ℃, and the annealing time is 1.5-2.5min, for example 2min. The research shows that: the ferrite stainless steel plate is rolled and annealed for multiple times before compounding, so that crystal grain clusters in the ferrite stainless steel have the same orientation, and further the wrinkling of the ferrite stainless steel on the outer wall of the composite plate formed by punching is avoided.
In the invention, the thicknesses of the austenitic stainless steel plate, the aluminum alloy plate and the ferritic stainless steel plate in the blank are not strictly limited and can be reasonably set according to actual requirements; in particular, the thickness of the austenitic stainless steel sheet in the blank may be 0.4-0.6mm, for example 0.5mm; the thickness of the aluminium alloy plate may be 1.7-1.9mm, for example 1.8mm; the thickness of the ferritic stainless steel sheet may be 0.5-0.7mm, for example 0.6mm; the shape and size of the blank is determined on the basis of the stamping part, and the blank may be, for example, circular in shape and 380-400mm in diameter.
In the invention, the stamping part can be a hollow cylinder structure with an outward flanging; at this time, the die used for the press forming includes a male die and a female die that are matched with the stamping part, and it is understood that the male die has a forming convex portion and a flanging portion that are matched with the stamping part. The research shows that: because each layer of the composite board is different, and each property of the composite board is also different, the problems of different flow rates and the like exist in the stamping forming process, so that the surface is easy to wrinkle, and particularly, the wrinkling is most obvious at a position which forms 90 degrees along the rolling direction (also called as a position in the vertical direction of the rolling) (as shown in figure 1); at the moment, the draw beads are symmetrically arranged at the flanging positions on two sides of the male die in the rolling vertical direction, namely the draw beads are symmetrically added at the position of the male die along the rolling direction by 90 degrees, so that the problems of uneven material flow speed and thickness change in all directions in the process of punch forming of the composite plate can be solved, and the adverse phenomena of wrinkling and the like of the ferrite stainless steel on the punch forming outer wall of the composite plate are further overcome.
More specifically, the symmetrically arranged draw beads can be in the ranges of 70-110 degrees and 250-290 degrees from the vertical direction of rolling respectively, namely, the starting position and the ending position of the draw bead on one side are positioned at the position of 70 degrees from the vertical direction of rolling of the flanging part of the male die and at the position of 110 degrees from the vertical direction of rolling, and the starting position and the ending position of the draw bead on the other side are positioned at the position of 250 degrees from the vertical direction of rolling of the flanging part of the male die and at the position of 290 degrees from the vertical direction of rolling; the drawing rib is in an arc shape, and the arc of the drawing rib and the peripheral arc of the flanging part of the male die are concentrically arranged.
The distance between the draw bead and the convex part formed by the male die can be 60-90mm, further 74-76mm, and preferably 75mm; the height of the drawing rib can be 15-25mm, further 18-22mm, and preferably 20mm; the thickness can be 15-22mm, further 14-18mm, preferably 16mm; the transition round angle can be 3-6mm, further 3-4mm, and preferably 3mm; the edge fillet radius of the die may be 11-13mm, preferably 12mm.
In the invention, the friction coefficient of the lubricated composite plate and the mould can be controlled to be 0.19-0.21, such as 0.2; in addition, the blank holder force can be controlled to 165-175kN, for example, 170kN, during the stamping forming.
The research shows that: by controlling the parameters such as the thickness, the height and the like of the draw bead in the proper range and controlling the parameters such as the fillet size of the edge of the female die, the friction coefficient, the blank holder force and the like in the proper range, the crystal grain orientation in the SUS430 ferrite stainless steel plate can be further more uniform, the flowing speed of the composite plate in all rolling directions in the stamping forming process is more uniform, the wrinkling problem of the ferrite stainless steel on the outer wall of the composite plate stamping forming is better eliminated, the production efficiency is improved, the production cost is reduced, and the method has important practical significance for solving the industrial problem of wrinkling of the ferrite stainless steel on the outer wall of the composite plate stamping forming.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an appearance view of corrugated outer wall of ferritic stainless steel of composite plate;
FIG. 2 is a front view of the male mold;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is a top view of the male mold;
FIG. 5 is a front view of the stamping;
FIG. 6 isbase:Sub>A cross-sectional view A-A of FIG. 5;
FIG. 7 is an enlarged view of FIG. 6 at B;
FIG. 8 is a schematic view of the blank at various angles along the rolling direction;
FIG. 9 is a metallographic structure of a stamping piece at 0 ° in the rolling direction at 500 times magnification of the external wall of SUS 430;
FIG. 10 is a 500-fold enlarged metallographic structure of the SUS430 outer wall at 45 degrees in the rolling direction;
FIG. 11 is a 500-fold enlarged metallographic structure of the SUS430 outer wall at 90 degrees in the rolling direction;
FIG. 12 is an image of a cross section of the outer wall of example 1 magnified 100 times;
fig. 13 is an image enlarged 100 times of the cross section of the outer wall of comparative example 1.
Description of reference numerals:
1: a male die; 11: a draw bead; 2: a female die; 2: austenitic stainless steel plates; 3: aluminum alloy plate; 4: ferritic stainless steel sheet.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The method for eliminating the corrugation of the ferritic stainless steel on the outer wall of the composite board formed by punching comprises the following steps:
s1: making blanks
The SUS430 ferrite stainless steel plate is rolled and annealed for multiple times, the annealing temperature is 860 ℃, and the heat preservation time is 2min.
SUS 304 austenitic stainless steel plate, al1050 aluminum alloy plate and SUS430 ferritic stainless steel plate which is subjected to the rolling and annealing treatment for multiple times are rolled to form composite plate, the composite plate is cut to form blank with the diameter phi of 390mm and the thickness of 2.9mm, and the thickness of the SUS 304 austenitic stainless steel plate, the thickness of the Al1050 aluminum alloy plate and the thickness of the SUS430 ferritic stainless steel plate in the blank are respectively 0.5mm, 1.8mm and 0.6mm.
S2: preparation mould
As shown in fig. 2 to 4, draw beads are symmetrically arranged on two sides of the flanging part of the male die along the rolling vertical direction, the ranges of the symmetrically arranged draw beads are respectively 70-110 degrees and 250-290 degrees from the rolling vertical direction, the distance S between the draw bead and the convex part of the male die forming is 75mm, the height H is 20mm, the thickness B is 16mm, and the transition round angle RB is 3mm; meanwhile, the edge fillet radius RA of the female die is adjusted to be 12mm, and the die comprising the male die and the female die is manufactured.
S3: preparation of stamped parts
Lubricating the surfaces of the blank and the die, and controlling the friction coefficient of the lubricated composite board and the die to be 0.2; and then, putting the blank on a die for punch forming, and controlling the blank pressing force to be 170kN during punching to obtain a punching part with the ferritic stainless steel plate as the outer wall, wherein the structure of the punching part is shown in figures 5 to 7.
Metallographic structures of the outer wall of the stamping part at various angles along the rolling direction are shown in the figures 8-11, the cross section of the outer wall of the stamping part is enlarged and shown in the figure 12, and the wrinkling condition is shown in the table 1.
Example 2
The method for eliminating the corrugation of the ferritic stainless steel on the outer wall of the composite board formed by punching comprises the following steps:
s1: manufacture of blanks
SUS 304 austenitic stainless steel plate, al1050 aluminum alloy plate and SUS430 ferritic stainless steel plate subjected to rolling and annealing treatment for a plurality of times in example 1 were rolled to prepare a composite plate, and the composite plate was cut to prepare a blank having a diameter phi of 380mm and a thickness of 2.8mm, wherein the thicknesses of the SUS 304 austenitic stainless steel plate, the Al1050 aluminum alloy plate and the SUS430 ferritic stainless steel plate in the blank were 0.4mm, 1.9mm and 0.5mm, respectively.
S2: preparation mould
Symmetrically arranging draw beads at two sides of the flanging part of the male die along the rolling vertical direction, wherein the ranges of the symmetrically arranged draw beads are respectively 70-110 degrees and 250-290 degrees from the rolling vertical direction, the distance S between the draw beads and the convex part formed by the male die is 74mm, the height H is 18mm, the thickness B is 14mm, and the transition round angle RB is 4mm; meanwhile, the edge fillet radius RA of the female die is adjusted to be 11mm, and the die comprising the male die and the female die is manufactured.
S3: preparation of stamped parts
Lubricating the surfaces of the blank and the die, and controlling the friction coefficient of the lubricated composite board and the die to be 0.19; and then, placing the blank on a die for punch forming, and controlling the blank pressing force to be 175kN during punching to obtain a punching part with the ferrite stainless steel plate as the outer wall.
Example 3
The method for eliminating the corrugation of the ferritic stainless steel on the outer wall of the composite board formed by punching comprises the following steps:
s1: making blanks
SUS 304 austenitic stainless steel plate, al1050 aluminum alloy plate and SUS430 ferritic stainless steel plate subjected to rolling and annealing treatment for a plurality of times in example 1 were rolled to prepare a composite plate, and the composite plate was cut to prepare a blank having a diameter phi of 400mm and a thickness of 3.0mm, wherein the thicknesses of the SUS 304 austenitic stainless steel plate, the Al1050 aluminum alloy plate and the SUS430 ferritic stainless steel plate in the blank were 0.6mm, 1.7mm and 0.7mm, respectively.
S2: preparation mould
Symmetrically arranging draw beads at two sides of the flanging part of the male die along the rolling vertical direction, wherein the symmetrically arranged draw beads are respectively positioned at 70-110 degrees and 250-290 degrees relative to the rolling vertical direction, the distance S between the draw beads and the convex part formed by the male die is 76mm, the height H is 22mm, the thickness B is 18mm, and the transition fillet RB is 3mm; meanwhile, the edge fillet radius RA of the female die is adjusted to be 13mm, and the die comprising the male die and the female die is manufactured.
S3: preparation of stamped parts
Lubricating the surfaces of the blank and the die, and controlling the friction coefficient of the lubricated composite board and the die to be 0.21; and then, placing the blank on a die for punch forming, and controlling the blank pressing force to be 165kN during punching to obtain a punching part with the ferrite stainless steel plate as the outer wall.
Comparative example 1
The same as example 1 except that no draw bead was provided on the male mold; an enlarged cross-sectional view of the outer wall of the stamped part of this comparative example is shown in figure 13.
Comparative example 2
The same as in example 1 was repeated, except that the radius RA of the die edge fillet was 10mm, that the blank holder force F was 150kN, and that no draw bead was provided on the male die.
Comparative example 3
The same as example 1 was repeated except that the SUS430 ferritic stainless steel sheet was not subjected to rolling and annealing a plurality of times, the die edge radius RA was 10mm, the blank holder force F was 150kN, and no draw bead was provided on the punch.
Test example 1
The stamped parts of example 1 and comparative examples 1 to 3 were machined using the same materials and with the same other machining parameters, and after machining, samples were cut at 90 ° positions along the rolling direction of each sample to prepare specimens, and the cross-sectional condition of the SUS430 ferritic stainless steel at 90 ° along the rolling direction was observed under an electron microscope to determine whether or not wrinkling was improved, the results being shown in table 1.
TABLE 1 comparison of experimental results of examples and comparative examples
Table 1 the results show that:
1. comparative example 1 no draw bead was provided, and the material was not uniform in flow velocity in each direction during press forming, so that it was observed that the SUS430 ferritic stainless steel outer wall had significant undulations;
2. comparative example 2 no draw bead is arranged and other stamping forming parameters are adopted, the material has uneven flow speed and thickness change in all directions in the stamping forming process, and the surface has serious wrinkling phenomenon;
3. comparative example 3 no draw bead was set and other press forming parameters were used, the material was not uniform in flow velocity and thickness variation in each direction during press forming; in addition, in the comparison document 3, the SUS430 ferritic stainless steel is not subjected to multiple rolling and annealing, and grain clusters with different orientations exist inside the SUS430 ferritic stainless steel, which aggravates the surface wrinkling phenomenon;
4. the SUS430 ferritic stainless steel of embodiment 1 of the present invention is formed by rolling and annealing for a plurality of times before being compounded, so that the grain orientation in the SUS430 ferritic stainless steel is relatively uniform; by selecting proper stamping process parameters: the fillet of the edge of the concave die, the friction coefficient and the blank holder force reduce the uneven change of the thickness of the material in the stamping forming process; the draw bead is added on the die corresponding to the position with high material flow rate, and the draw bead selects proper parameters such as thickness, height and the like, so that materials at different positions along the rolling direction flow uniformly in the stamping process, and the aim of eliminating the corrugation of the ferritic stainless steel on the outer wall of the composite plate stamping forming is fulfilled.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for eliminating wrinkles of ferritic stainless steel on the outer wall of a composite board formed by punch forming is characterized by comprising the following steps:
s1: manufacturing an austenitic stainless steel plate, an aluminum alloy plate and a ferritic stainless steel plate subjected to multiple rolling and annealing treatments into a composite plate, and cutting the composite plate to obtain a blank;
s2: symmetrically arranging draw beads on two sides of the male die in the rolling vertical direction, and adjusting the edge fillet radius of the female die to prepare a die;
s3: and (3) lubricating the surfaces of the blank and the die, and then placing the blank on the die for punch forming after lubrication to obtain a stamping part with the ferrite stainless steel plate as the outer wall.
2. The method according to claim 1, wherein the austenitic stainless steel plate is made of SUS 304, the aluminum alloy plate is made of Al1050, and the ferritic stainless steel plate is made of SUS 430.
3. The method of claim 1, wherein the austenitic stainless steel sheet in the blank has a thickness of 0.4 to 0.6mm, the aluminum alloy sheet has a thickness of 1.7 to 1.9mm, and the ferritic stainless steel sheet has a thickness of 0.5 to 0.7mm; the diameter of the blank is 380-400mm.
4. The method of claim 1, wherein the annealing temperature is 855-865 ℃ and the annealing time is 1.5-2.5min.
5. The method of claim 1, wherein the symmetrically disposed draw beads are positioned at 70 ° to 110 ° and 250 ° to 290 ° from the vertical direction of rolling, respectively.
6. The method of claim 1, wherein the distance of the bead from the convex portion of the male mold is 60 to 90mm, the height of the bead is 15 to 25mm, the thickness is 15 to 22mm, and the transition radius is 3 to 6mm.
7. A method according to claim 6, wherein the distance of the bead from the male forming protrusion is 74-76mm, the height of the bead is 18-22mm, the thickness is 14-18mm, and the transition radius is 3-4mm.
8. The method of claim 1, wherein the die has an edge radius of 11-13mm.
9. The method of claim 1, wherein the lubricated blank has a coefficient of friction with the mold of 0.19 to 0.21.
10. The method of claim 1, wherein the blank holder force is controlled to be 165-175kN during the press forming.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211350698.0A CN115591993A (en) | 2022-10-31 | 2022-10-31 | Method for eliminating ferrite stainless steel wrinkles on outer wall formed by composite board punch forming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211350698.0A CN115591993A (en) | 2022-10-31 | 2022-10-31 | Method for eliminating ferrite stainless steel wrinkles on outer wall formed by composite board punch forming |
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| CN115591993A true CN115591993A (en) | 2023-01-13 |
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| CN202211350698.0A Pending CN115591993A (en) | 2022-10-31 | 2022-10-31 | Method for eliminating ferrite stainless steel wrinkles on outer wall formed by composite board punch forming |
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| CN (1) | CN115591993A (en) |
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| CN105331899A (en) * | 2015-09-24 | 2016-02-17 | 宝钢不锈钢有限公司 | Ferritic stainless steel with good crease resistance and manufacturing method of ferritic stainless steel |
| CN207386404U (en) * | 2017-09-12 | 2018-05-22 | 西安庄信新材料科技有限公司 | A kind of titanium aluminium-steel composite pot has stretching tool |
| CN112030058A (en) * | 2020-08-28 | 2020-12-04 | 广州大学 | Method for producing Ti microalloyed Q345B steel grade and Q345B steel grade by TMCP process |
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