CN112872035B - Production process of aluminum-silicon variable thickness plate for thermal forming - Google Patents
Production process of aluminum-silicon variable thickness plate for thermal forming Download PDFInfo
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 68
- 239000002994 raw material Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000010008 shearing Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000007704 transition Effects 0.000 claims description 27
- 230000008719 thickening Effects 0.000 claims description 16
- 238000003698 laser cutting Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000007747 plating Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000003856 thermoforming Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 11
- 239000013585 weight reducing agent Substances 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 229910018125 Al-Si Inorganic materials 0.000 description 4
- 229910018520 Al—Si Inorganic materials 0.000 description 4
- 208000034656 Contusions Diseases 0.000 description 4
- 230000009519 contusion Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
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- 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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
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Abstract
The invention discloses a production process of an aluminum-silicon variable-thickness plate for thermal forming, which adopts the processes of specification setting → raw material selection → rolling parameter setting → thickness-changing rolling → straightening shearing → blanking, further considers high strength and weight reduction on the basis of the thermal forming aluminum-silicon plate, makes up the complexity and the defects of the tailor-welding process of the aluminum-silicon plate, produces the aluminum-silicon variable-thickness plate for thermal forming and the special-shaped aluminum-silicon variable-thickness plate with good performance, can meet the use performance of automobile inner plate structural members and safety members, and realizes the perfect combination of material weight reduction and structure weight reduction.
Description
Technical Field
The invention belongs to a variable thickness plate rolling technology, and particularly relates to a production process of an aluminum-silicon variable thickness plate for thermal forming.
Background
The general trend of the current automobile technical development is energy conservation, environmental protection, safety, comfort, intellectualization and networking, the reduction of oil consumption and emission on the premise of ensuring performance is one of the problems which need to be solved urgently in the current automobile field, and the light weight of the automobile is an important way for solving the problem and becomes the mainstream of the modern automobile design and manufacture; considering that the mass of an automobile body accounts for 30-40% of the total weight of the automobile, and when the weight of the automobile is reduced by 100 kilograms, at least 0.6L of fuel oil can be saved per hundred kilometers, and the emission of CO2 of 5g per kilometer can be reduced; therefore, the weight reduction of the whole automobile is important for reducing the self weight of the whole automobile, improving the fuel economy of the whole automobile, saving energy and protecting environment.
In order to meet the requirements of reducing fuel consumption and pollutant emission of automobiles, the aluminum-silicon plate for thermoforming is gradually one of the preferable materials of the ultrahigh-strength automobile parts, and the combination of the variable-thickness plate and the aluminum-silicon plate reflects the idea of obtaining materials as required and reduces weight without losing strength. In the prior art, an aluminum-silicon tailor-welded blank is also a lightweight technology, but due to the fact that an aluminum-silicon plate has a plating layer, welding seam performance is deteriorated due to direct welding, the plating layer and a base material need to be stripped in a general welding process, then wire filling welding is carried out, the welding seam performance can be guaranteed, and the process is complex.
In view of the above situation, a new method is found, which can make up for the complexity and the defects of the aluminum-silicon plate tailor-welding process, reduce the weight of the automobile body, improve the weld defects and the performance, and realize the light weight of the automobile structure on the basis of the light weight of the hot forming material.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production process of an aluminum-silicon variable thickness plate for hot forming, which adopts the steps of specification setting → raw material selection → rolling parameter setting → thickness-changing rolling → straightening shearing → blanking process, further considers high strength and weight reduction on the basis of a hot forming aluminum-silicon plate, makes up the complexity and the defects of the aluminum-silicon plate welding process, produces the aluminum-silicon variable thickness plate for hot forming and the special-shaped aluminum-silicon variable thickness plate with good performance, can meet the use performance of automobile inner plate structural members and safety members, and realizes the perfect combination of material light weight and structure light weight.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a production process of an aluminum-silicon variable thickness plate for hot forming, which comprises the following steps:
(1) setting specification, setting n equal-thickness sections of the finished product aluminum-silicon variable thickness plate, wherein the thickness of each equal-thickness section is H1，H2，H3，……，HnEach equal thickness section has a length L1，L2，L3，……，HnThe width of the finished product aluminum-silicon variable thickness plate is B, and the maximum thickness of n equal-thickness sections is Hmax＝max(H1，H2，……，Hn) Minimum thickness of Hmin＝min(H1，H2，……，Hn) N-1 transition sections are arranged among the n equal-thickness sections, and the length of the n-1 transition sections is S1，S1，S2，……，Sn-1；
(2) Selecting raw materials, namely adopting a cold-rolled aluminum-silicon-plated sheet as a raw material sheet, wherein the thickness H of the raw material sheet satisfies Hmax+0.1≤h≤2.5*HminOf both sides of said cold-rolled aluminum-silicon-plated sheet materialThe plating layers all meet the requirement of 60-90 g/m2；
(3) Setting rolling parameters, and calculating the inlet tension and the outlet tension of the rolling mill as follows:
tension at the inlet of the rolling mill: t is1＝k*δs*b*h；
Exit tension of the rolling mill: t is2＝1.1*T1；
In the formula, T1Is the mill inlet tension, with the unit of KN;
k is an influence coefficient, is 0.15-0.23, and is dimensionless;
δ s is the yield strength of the raw material plate, and the unit is MPa;
b is the width of the raw material plate, and the unit is mm;
h is the thickness of the raw material plate, and the unit is mm;
T2is the mill exit tension, in KN;
(4) thickening and rolling, namely performing thickening and rolling according to the specification of the finished product aluminum-silicon variable-thickness plate in the step (1) and the yield strength of the raw material plate and the rolling parameters set in the step (3) to obtain a thickened rolled piece;
(5) and straightening and shearing, namely straightening and transversely cutting the thickened rolled piece to obtain the aluminum-silicon variable thickness plate for thermal forming.
Preferably, in the step (1), in the finished aluminum-silicon variable thickness plate,
length S of jth transitionj＝d*100；
Wherein j is 1, 2, 3 … …, n-1;
Sjis the length of the jth transition section in mm;
d is the thickness difference of two adjacent equal-thickness sections of the jth transition section, and the unit is mm.
Preferably, in the step (2), the plate material is steel with the grade of HC950/1300HS + AS.
Preferably, in the step (4), the variable thickness plate mill used in the variable thickness rolling can feed back the rolling size in real time and automatically adjust.
Preferably, in the step (5), the device used in the straightening shearing process is a thickened plate straightening shearing line which is capable of automatically identifying the size profile of the thickened plate and feeding the thickened plate to length.
Preferably, the production process of the aluminum-silicon variable thickness plate for hot forming further comprises
And (6) blanking, namely, cutting and blanking the aluminum-silicon variable thickness plate for thermal forming through a press or laser to obtain the special-shaped aluminum-silicon variable thickness plate.
Preferably, in the step (6), the production line used in the blanking process is a blanking line of press punching blanking or laser cutting blanking.
Preferably, the yield strength of the aluminum-silicon variable thickness plate for hot forming is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, and the hardness HV10 is more than or equal to 400.
Preferably, the yield strength of the special-shaped aluminum-silicon variable thickness plate is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, and the hardness HV10 is more than or equal to 400.
The production process of the aluminum-silicon variable thickness plate for hot forming provided by the invention also has the following beneficial effects:
1) according to the production process of the aluminum-silicon variable-thickness plate for thermal forming, disclosed by the invention, the material selection → thickness-changing rolling → straightening shearing → blanking process is adopted, on the basis of the thermal forming aluminum-silicon plate, the high strength and the weight reduction are further considered, the complexity and the defects of the aluminum-silicon plate welding process are made up, the aluminum-silicon variable-thickness plate for thermal forming with good performance is produced, the use performance of automobile inner plate structural members and safety members can be met, and the perfect combination of material weight reduction and structure weight reduction is realized;
2) the production process of the aluminum-silicon variable-thickness plate for thermal forming can realize continuous production, and has high production efficiency and flexible thickness combination;
3) the aluminum-silicon variable thickness plate for hot forming prepared by the production process of the aluminum-silicon variable thickness plate for hot forming replaces welding seams with transition areas, is smooth in connection and good in surface quality, and is good in metal fluidity during subsequent stamping, and simple in mold design;
4) the transition region of the aluminum-silicon variable thickness plate for thermal forming has good energy absorption effect and better impact resistance;
5) the aluminum-silicon variable thickness plate for thermal forming has simple production process, replaces complex aluminum-silicon coating stripping and filler wire welding, and greatly improves the connection strength.
Drawings
FIG. 1 is a schematic flow chart of the process for manufacturing the aluminum-silicon variable thickness plate for hot forming according to the present invention;
FIG. 2 is a schematic view of the apparatus used in the process for manufacturing the aluminum-silicon variable thickness plate for hot forming according to the present invention;
FIG. 3 is a schematic diagram showing the shape of a deformed Al-Si plate according to example 1 of the present invention (a) for setting the specification of the finished Al-Si plate;
FIG. 4 is a schematic diagram showing the plate shape distribution of the aluminum-silicon variable-thickness plate (a) for setting the specification of the finished aluminum-silicon variable-thickness plate and (b) for the deformed aluminum-silicon variable-thickness plate in example 2 of the present invention;
FIG. 5 is a schematic diagram showing the plate shape distribution of the aluminum-silicon variable-thickness plate (a) for setting the specification of the finished aluminum-silicon variable-thickness plate and (b) for the deformed aluminum-silicon variable-thickness plate in example 3 of the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
As shown in FIG. 1, the production process of the aluminum-silicon variable thickness plate for hot forming provided by the invention comprises the following steps:
(1) setting specification, setting n equal-thickness sections of the finished product aluminum-silicon variable thickness plate, wherein the thickness of each equal-thickness section is H1，H2，H3，……，HnEach equal thickness section has a length L1，L2，L3，……，HnThe width of the finished product of the aluminum-silicon variable thickness plate is B, wherein the maximum thickness of the n equal-thickness sections is Hmax＝max(H1，H2，……，Hn) Minimum thickness of Hmin＝min(H1，H2，……，Hn) N-1 transition sections are arranged among the n equal-thickness sections, and the length of the n-1 transition sections is S1，S1，S2，……，Sn-1(ii) a Wherein, in the finished product of the aluminum-silicon variable thick plate,
length S of jth transitionj＝d*100；
j＝1，2，3……，n-1；
SjIs the length of the jth transition section in mm;
d is the thickness difference of two adjacent equal-thickness sections of the jth transition section, and the unit is mm.
The specific process is as follows: firstly, designing the specification of a finished product aluminum-silicon variable thickness plate according to the plate shape distribution of a part to be produced and within the control specification of a variable thickness rolling mill, and setting the finished product aluminum-silicon variable thickness plate to have n equal-thickness sections, wherein the thickness of each equal-thickness section is H1，H2，H3，……，HnEach equal thickness section has a length L1，L2，L3，……，HnThe width of the finished product of the aluminum-silicon variable thickness plate is B, wherein the maximum thickness of the n equal-thickness sections is Hmax＝max(H1，H2，……，Hn) Minimum thickness of Hmin＝min(H1，H2，……，Hn) N-1 transition sections are arranged among the n equal-thickness sections, and the length of the n-1 transition sections is S1，S1，S2，……，Sn-1；
Wherein in n-1 transition sections of the finished product of the aluminum-silicon variable thick plate,
length S of jth transitionj＝d*100；
j＝1，2，3……，n-1；
SjIs the length of the jth transition section in mm;
d is the thickness difference of two adjacent equal-thickness sections of the jth transition section, and the unit is mm.
(2) Selecting raw materials, adopting a cold-rolled aluminum-silicon-plated sheet as a raw material sheet, wherein the thickness H of the raw material sheet satisfies Hmax+0.1≤h≤2.5*HminThe plating layers on both sides of the cold-rolled aluminum-silicon plated sheet material meet 60-90 g/m2；
The specific process is as follows: selecting a raw material plate according to the specification of the finished product aluminum-silicon variable thickness plate set in the step (1), and adopting the steel grade of HC950/1300HS in the cold-rolled aluminum-silicon plated plate in terms of materialThe aluminum-silicon plate of + AS is taken AS a raw material plate; the thickness H of the raw material plate should satisfy Hmax+0.1≤h≤2.5*HminThe plating layers on both sides of the raw material plate should meet the requirement of 60-90 g/m2(ii) a Wherein the width b of the raw material plate is consistent with the width of the set finished product aluminum-silicon variable thickness plate;
(3) setting rolling parameters
Designing parameters in the thickening rolling process according to the specification, the mechanical property and the like of the raw material plate selected in the step (2) to ensure that the aluminum-silicon surface is not easy to contort, wherein the inlet tension and the outlet tension of the rolling mill are respectively as follows:
tension at the inlet of the rolling mill: t is a unit of1＝k*δs*b*h；
Exit tension of the rolling mill: t is2＝1.1*T1；
In the formula, T1Is the mill inlet tension, with the unit of KN;
k is an influence coefficient, is 0.15-0.23, and is dimensionless;
δ s is the yield strength of the raw material plate, and the unit is MPa;
b is the width of the raw material plate, and the unit is mm;
h is the thickness of the raw material plate, and the unit is mm;
T2is the mill exit tension, in KN;
(4) thickening and rolling, namely thickening and rolling according to the specification of the finished aluminum-silicon variable-thickness plate in the step (1) and the yield strength of the raw material plate and the rolling parameters set in the step (3) to obtain a thickened rolled piece;
the specific process is as follows: inputting the specifications (n equal-thickness sections and corresponding thicknesses and lengths thereof, and n-1 transition sections and corresponding lengths thereof) of the finished aluminum-silicon variable-thickness plate in the step (1), the yield strength of the raw material plate selected in the step (2) and the rolling parameters set in the step (3) into a variable-thickness rolling mill (see fig. 2), loading the variable-thickness rolling mill into a control program, and performing computer calculation control and continuous adjustment of roll gaps to obtain a plate continuously changing according to the target thickness of the finished variable-thickness plate in the rolling direction, thereby realizing the rolling from the equal-thickness plate to the variable-thickness rolled piece and obtaining the variable-thickness rolled piece. In which a variable thickness plate mill used in the thickening rolling (see fig. 2) can feed back the rolling size in real time and adjust automatically.
(5) And (5) straightening and shearing, namely straightening and transversely cutting the thickened rolled piece to obtain the aluminum-silicon variable thickness plate for hot forming. The device used in the straightening shearing process is a variable thickness plate straightening shearing line (see figure 2) capable of automatically identifying the size contour of a variable thickness plate and feeding the variable thickness plate to a fixed length.
The specific process is as follows: straightening and transversely cutting the thickened rolled piece obtained in the step (4) on a straightening and shearing line of a variable-thickness plate to form an aluminum-silicon variable-thickness plate for hot forming, wherein equipment (see figure 2) used in the straightening and shearing process is the straightening and shearing line of the variable-thickness plate, which can automatically identify the size and the profile of the variable-thickness plate and feed the variable-thickness plate to a fixed length; the straightening and shearing line of the variable-thickness plate can automatically identify the size contour of the variable-thickness plate through the thickness meter and the velocimeter, and the variable-thickness plate is cut according to the set requirement, so that the aluminum-silicon variable-thickness plate for hot forming, which meets the size requirement, is obtained.
After the treatment of the steps (1) to (5), the aluminum-silicon variable plate for hot forming can be obtained, and the rolling from the cold rolling aluminum-silicon plated thick plate and other thick plates to the aluminum-silicon variable plate for hot forming is realized.
In the production process of the aluminum-silicon variable thickness plate for hot forming, blanking treatment in the step (6) is required to be carried out on the parts to be processed, namely
(6) And blanking, namely, blanking the aluminum-silicon variable-thickness plate for thermal forming through a press or laser cutting to obtain the special-shaped aluminum-silicon variable-thickness plate. Wherein, the production line used in the blanking process is a blanking line of press punching blanking or laser cutting blanking (see figure 2); the processing of the special-shaped aluminum-silicon variable-thickness plate needs to use a corresponding blanking die, and the specific blanking die is selected according to the shape required by the processed part.
Experiments prove that the aluminum-silicon variable thickness plate for hot forming and the special-shaped aluminum-silicon variable thickness plate prepared according to the preparation process have the length precision of +/-2 mm in each section, the thickness tolerance of +/-0.05 mm and no contusion on the surface, all regions of the material after hot stamping forming are consistent with the performance of aluminum-silicon with equal thickness, the yield strength is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, the hardness HV10 is more than or equal to 400, the service performance of automobile inner plate structural members and safety members is met, and the perfect combination of light weight of the material and light weight of the structure is realized.
The production process of the aluminum-silicon variable-thickness plate for thermoforming and the special-shaped aluminum-silicon variable-thickness plate of the invention is further described with reference to specific examples; wherein the production line used in the following production process (see fig. 2) mainly comprises: the device comprises a variable thickness plate rolling mill (capable of feeding back rolling size in real time and automatically adjusting), a variable thickness plate straightening and shearing line (capable of automatically identifying the size and contour of a variable thickness plate and feeding the variable thickness plate to a fixed length), a press blanking line or a laser cutting blanking line.
Example 1
(1) Setting the specification: in the present embodiment, the plate shape distribution of the part to be processed is the special-shaped aluminum-silicon variable thickness plate shown in fig. 3(b), and within the control specification of the variable thickness rolling mill, the specification of the finished aluminum-silicon variable thickness plate is designed as shown in fig. 3(a), and is 1.5-2.0-1.5 × 760 × 1370mm (760mm is the width of the finished aluminum-silicon variable thickness plate, 1370mm is the total length of the finished aluminum-silicon variable thickness plate), wherein the lengths of the 1.5 equal thickness sections are: 500mm, 1.85 equal thickness section: 300mm and the length of the transition area is 35 mm;
(2) selecting raw materials: according to the specification of the finished product aluminum-silicon variable thickness plate set in the step (1), adopting an aluminum-silicon plate with the specification of 2.15 x 760mm and the steel grade mark of HC950/1300HS + AS AS a raw material plate; the thickness H of the raw material plate is 2.15mm and satisfies Hmax+0.1≤h≤2.5*HminThe AS coating layers on both sides of the raw material plate are 75/75g/m2(ii) a Wherein the length of the transition section of the raw material plate is consistent with the set finished product aluminum-silicon variable thickness plate, which is specifically shown in table 1;
TABLE 1 specification of finished Al-Si variable thick plate and yield strength of raw material plate
(3) Setting rolling parameters: parameters in the process of thickening rolling are designed according to the specification and yield strength of the raw material plate in table 1, an influence coefficient k is 0.23, and the mill inlet tension and the mill outlet tension are calculated as shown in table 1: t is1＝135KN，T2＝148KN；
(4) Thickening and rolling: and (3) inputting the specification of the aluminum-silicon variable thickness plate finished in the step (1), the yield strength of the raw material plate selected in the step (2) and the rolling parameters set in the step (3) into a thickening rolling mill, loading the thickness variable rolling mill into a control program, coiling, threading, starting rolling, inputting in a variable procedure, coiling, and uncoiling to obtain the thickened rolled piece.
(5) Straightening and shearing: and (4) straightening and shearing the flattened and thickened coil on a straightening and shearing line of the variable-thickness plate to obtain the aluminum-silicon variable-thickness plate for hot forming, which meets the requirements of finished products.
(6) And (3) blanking, namely blanking the aluminum-silicon variable thickness plate for thermal forming through a press or laser cutting to obtain the special-shaped aluminum-silicon variable thickness plate corresponding to the part to be processed.
Practice proves that the aluminum-silicon variable thickness plate and the special-shaped aluminum-silicon variable thickness plate for hot forming have the advantages that the length precision of each section is +/-2 mm, the thickness tolerance is +/-0.05 mm, the surface is free of contusion, all areas of the material after hot stamping forming are consistent with the equal-thickness section in performance, the yield strength is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, the hardness HV10 is more than or equal to 400, and the requirements of the use performance of automobile inner plate structural members, safety members and the like are met.
Example 2
(1) Setting the specification: in the present embodiment, the profile shape distribution of the part to be processed is as shown in fig. 4(b), and the specification of the finished product of the al-si variable thick plate is designed as shown in fig. 4(a) within the control specification of the variable thickness rolling mill, and is 2.5-1.8 × 480 × 1010mm (480mm is the width of the finished product of the al-si variable thick plate, 1010mm is the total length of the finished product of the al-si variable thick plate), wherein the 2.5 equal-thickness segment length is: 660mm, 1.8 equal thickness section: 265mm and 85mm of length of the transition region;
(2) selecting raw materials: according to the specification of the finished product aluminum-silicon variable thickness plate set in the step (1), adopting an aluminum-silicon plate with the specification of 2.7 x 480mm and the steel grade mark of HC950/1300HS + AS AS a raw material plate; the thickness H of the raw material plate is 2.7mm and satisfies Hmax+0.1≤h≤2.5*HminThe AS coating layers on both sides of the raw material plate are 75/75g/m2(ii) a Wherein the length of the transition section of the raw material plate is consistent with the set finished product aluminum-silicon variable thickness plate, which is specifically shown in table 1;
TABLE 2 specification of finished Al-Si variable thick plate and yield strength of raw material plate
(3) Setting rolling parameters: parameters in the thickening rolling process were designed according to the gauge and yield strength of the raw plate in table 1, and the mill inlet tension and mill outlet tension were calculated as shown in table 1 using an influence coefficient k of 0.19: t is1＝92KN，T2＝101KN；
(4) Thickening and rolling: and (3) inputting the specification of the aluminum-silicon variable-thickness plate obtained in the step (1), the yield strength of the raw material plate selected in the step (2) and the rolling parameters set in the step (3) into a variable-thickness rolling mill, loading the variable-thickness rolling mill into a control program, coiling, threading, starting rolling, inputting in variable program sequences, coiling, and uncoiling to obtain the variable-thickness rolled piece.
(5) Straightening and shearing: and (4) straightening and shearing the flattened and thickened coil on a straightening and shearing line of the variable-thickness plate to obtain the aluminum-silicon variable-thickness plate for thermal forming, which meets the requirements of finished products.
(6) And (3) blanking, namely blanking the aluminum-silicon variable thickness plate for thermal forming through a press or laser cutting to obtain the special-shaped aluminum-silicon variable thickness plate corresponding to the part to be processed.
Practice proves that the aluminum-silicon variable thickness plate and the special-shaped aluminum-silicon variable thickness plate for hot forming have the advantages that the length precision of each section is +/-2 mm, the thickness tolerance is +/-0.05 mm, the surface is free of contusion, all areas of the material after hot stamping forming are consistent with the equal-thickness section in performance, the yield strength is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, the hardness HV10 is more than or equal to 400, and the requirements of the use performance of automobile inner plate structural members, safety members and the like are met.
Example 3
(1) Setting the specification: in the present embodiment, the profile shape distribution of the part to be processed is the special-shaped aluminum-silicon variable thickness plate shown in fig. 5(b), and within the control specification of the variable thickness rolling mill, the specification of the finished aluminum-silicon variable thickness plate is designed as shown in fig. 5(a), and is 1.4-2.0-1.4 x 600 x 820mm (600mm is the width of the finished aluminum-silicon variable thickness plate, 820mm is the total length of the finished aluminum-silicon variable thickness plate), wherein the first 1.4 equal-thickness segment length is: 135mm, 2.0 equal thickness section: 300mm, the length of the second 1.4 equal-thickness segment is: 110mm, the length of the transition section between the first 1.4 equal-thickness section and the 2.0 equal-thickness section is as follows: 130mm, the length of the transition section between the 2.0 equal-thickness section and the second 1.4 equal-thickness section is 145 mm;
(2) selecting raw materials: according to the specification of the finished product aluminum-silicon variable thickness plate set in the step (1), adopting an aluminum-silicon plate with the specification of 2.2 x 600mm and the steel grade mark of HC950/1300HS + AS AS a raw material plate; the thickness H of the raw material plate is 2.2mm and satisfies Hmax+0.1≤h≤2.5*HminThe AS coating layers on both sides of the raw material plate are 75/75g/m2(ii) a Wherein the length of the transition section of the raw material plate is consistent with the set finished product aluminum-silicon variable thickness plate, which is specifically shown in table 1;
TABLE 1 Specification of finished product aluminum-silicon variable-thickness plate and yield strength of raw material plate
(3) Setting rolling parameters: parameters in the process of thickening rolling are designed according to the specification and yield strength of the raw material plate in table 1, an influence coefficient k is 0.2, and the mill inlet tension and the mill outlet tension are calculated as shown in table 1: t is a unit of1＝95KN，T2＝105KN；
(4) Thickening and rolling: and (3) inputting the specification of the aluminum-silicon variable thickness plate finished in the step (1), the yield strength of the raw material plate selected in the step (2) and the rolling parameters set in the step (3) into a thickening rolling mill, loading the thickness variable rolling mill into a control program, coiling, threading, starting rolling, inputting in a variable procedure, coiling, and uncoiling to obtain the thickened rolled piece.
(5) Straightening and shearing: and (4) straightening and shearing the flattened and thickened coil on a straightening and shearing line of the variable-thickness plate to obtain the aluminum-silicon variable-thickness plate for hot forming, which meets the requirements of finished products.
(6) And (3) blanking, namely blanking the aluminum-silicon variable thickness plate for thermal forming through a press or laser cutting to obtain the special-shaped aluminum-silicon variable thickness plate corresponding to the part to be processed.
Practice proves that the aluminum-silicon variable thickness plate and the special-shaped aluminum-silicon variable thickness plate for hot forming have the advantages that the length precision of each section is +/-2 mm, the thickness tolerance is +/-0.05 mm, the surface is free of contusion, all areas of the material after hot stamping forming are consistent with the equal-thickness section in performance, the yield strength is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is more than or equal to 5%, the hardness HV10 is more than or equal to 400, and the requirements of automobile inner plate structural members, safety parts and the like are met.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (9)
1. A production process of an aluminum-silicon variable thickness plate for hot forming is characterized by comprising the following steps:
(1) setting specification, setting n equal-thickness sections of the finished product aluminum-silicon variable-thickness plate, wherein the thickness of each equal-thickness section is H1，H2，H3，……，HnEach equal thickness section has a length L1，L2，L3，……，LnThe width of the finished product aluminum-silicon variable thickness plate is B, and the maximum thickness of n equal-thickness sections is Hmax＝max(H1，H2，……，Hn) Minimum thickness of Hmin＝min(H1，H2，……，Hn) N-1 transition sections are arranged among the n equal-thickness sections, and the length of the n-1 transition sections is S1，S1，S2，……，Sn-1；
(2) Selecting raw materials, namely adopting a cold-rolled aluminum-silicon-plated sheet as a raw material sheet, wherein the thickness H of the raw material sheet satisfies Hmax+0.1≤h≤2.5*HminThe plating layers on both sides of the cold-rolled aluminum-silicon plated sheet material meet the requirement of 60-90 g/m2；
(3) Setting rolling parameters, and calculating the inlet tension and the outlet tension of the rolling mill as follows:
tension at the inlet of the rolling mill: t is1＝k*δs*b*h；
Exit tension of the rolling mill: t is2＝1.1*T1；
In the formula, T1Is the mill inlet tension, with the unit of KN;
k is an influence coefficient, is 0.15-0.23, and is dimensionless;
δ s is the yield strength of the raw material plate, and the unit is MPa;
b is the width of the raw material plate, and the unit is mm;
h is the thickness of the raw material plate, and the unit is mm;
T2is the mill exit tension, in KN;
(4) thickening and rolling, namely performing thickening and rolling according to the specification of the finished product aluminum-silicon variable-thickness plate in the step (1) and the yield strength of the raw material plate and the rolling parameters set in the step (3) to obtain a thickened rolled piece;
(5) straightening and shearing, namely straightening and transversely cutting the thickened rolled piece to obtain the aluminum-silicon variable-thickness plate for thermal forming.
2. The manufacturing process of the aluminum-silicon variable thickness plate for hot forming according to claim 1, wherein in the step (1), in the finished aluminum-silicon variable thickness plate,
length S of jth transitionj＝d*100；
Wherein j is 1, 2, 3 … …, n-1;
Sjis the length of the jth transition section in mm;
d is the thickness difference of two adjacent equal-thickness sections of the jth transition section, and the unit is mm.
3. The process for producing an aluminum-silicon variable thickness plate for hot forming according to claim 1, wherein in the step (2), the steel grade of the raw material plate is HC950/1300HS + AS.
4. The process for producing an aluminum-silicon variable thickness plate for hot forming according to claim 1, wherein in the step (4), the rolling mill for variable thickness rolling can feed back the rolling size in real time and adjust automatically.
5. The process for producing an aluminum-silicon variable thickness plate for thermoforming as claimed in claim 1, wherein in the step (5), the device used in the straightening and shearing process is a variable thickness plate straightening and shearing line capable of automatically identifying the size and contour of the variable thickness plate and feeding the variable thickness plate to length.
6. The production process of the aluminum-silicon variable thickness plate for hot forming according to any one of claims 1 to 5, wherein the production process of the aluminum-silicon variable thickness plate for hot forming further comprises the step (6) of blanking, and the aluminum-silicon variable thickness plate for hot forming is blanked by a press or laser cutting to obtain the special-shaped aluminum-silicon variable thickness plate.
7. The process for producing the aluminum-silicon variable thickness plate for thermoforming as claimed in claim 6, wherein in the step (6), the production line used in the blanking process is a blanking line of press punching blanking or laser cutting blanking.
8. The production process of the aluminum-silicon variable thickness plate for hot forming according to any one of claims 1 to 5, wherein the aluminum-silicon variable thickness plate for hot forming has a yield strength of 950 to 1250MPa, a tensile strength of 1300 to 1700MPa, an elongation of 5% or more, and a hardness HV10 of 400 or more.
9. The production process of the aluminum-silicon variable thickness plate for hot forming according to claim 6, wherein the yield strength of the special-shaped aluminum-silicon variable thickness plate is 950-1250 MPa, the tensile strength is 1300-1700 MPa, the elongation is not less than 5%, and the hardness HV10 is not less than 400.
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| JPH02268912A (en) * | 1989-04-08 | 1990-11-02 | Nippon Steel Corp | Method for controlling plate thickness in unsteady rolling area in tandem cold rolling |
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