CN112883599A - Method for evaluating stamping forming performance of magnesium alloy plate for preparing box-shaped component - Google Patents
Method for evaluating stamping forming performance of magnesium alloy plate for preparing box-shaped component Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000002474 experimental method Methods 0.000 claims abstract description 23
- 238000011156 evaluation Methods 0.000 claims abstract description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 17
- 229910052749 magnesium Inorganic materials 0.000 claims description 17
- 239000011777 magnesium Substances 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000009864 tensile test Methods 0.000 claims 2
- 239000011230 binding agent Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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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
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a method for evaluating the stamping forming performance of a magnesium alloy plate for preparing a box-shaped component, which comprises the following steps: defining the shape of a box-shaped component, establishing a model, dividing grids, endowing plate material attributes, calculating and solving, defining the dangerous part of the component and evaluating the forming performance of the component. The invention can visually see the stress field, the strain field, the thickness change and the material flow rule of the material in the forming process by adopting the forming simulation technology, can quickly and accurately find the dangerous part in the forming process of the component, performs experiment and evaluation on the dangerous part of the component, can judge whether the plate meets the forming requirement in advance, saves the processes of die sinking, stamping forming experiment and the like, and greatly reduces the development period and the cost of the product.
Description
Technical Field
The invention relates to the field of non-ferrous metal plate forming processing, in particular to a method for evaluating the stamping forming performance of a magnesium alloy plate for preparing a box-shaped component.
Background
The magnesium alloy has the advantages of light weight, good electronic shielding performance, radiation resistance, strong shock absorption capacity and the like, and has wide application prospects in the main national economy industries such as aerospace, transportation, 3C electronics and the like and the fields of national defense and military industry and the like.
The magnesium alloy product with thin wall, excellent performance, different shape and excellent surface can be obtained by adopting the plate stamping process with high yield. The magnesium alloy has a close-packed hexagonal structure and is difficult to plastically deform, so that the technical difficulty exists in stamping and forming the magnesium alloy plate. Enterprises and research institutions at home and abroad also carry out extensive research on the magnesium alloy stamping forming technology and make great progress. However, the market share of the magnesium alloy sheet material stamping forming component is still low so far, and the yield per year is less than 2000 tons, which is far lower than that of steel and aluminum. One of the main reasons is that magnesium alloy is difficult to form, and the specification and standard of magnesium alloy sheet material stamping forming are imperfect, and the existing standard and standard can not visually reflect the stamping forming performance of the magnesium alloy sheet material, so that magnesium alloy sheet material use enterprises can not evaluate whether the sheet material meets the forming requirement, and therefore, the magnesium alloy sheet material stamping forming performance is evaluated, and the method has important practical significance for popularization of the magnesium alloy sheet material.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for evaluating the stamping and forming performance of magnesium alloy sheet material for preparing box-shaped structural members, by which whether the sheet material of corresponding batch meets the forming requirements of the structural members can be judged.
The invention is realized by the following technical scheme.
A method for evaluating press formability of a magnesium alloy sheet for producing a box-shaped member, comprising:
(1) establishing an initial stamping model by adopting professional drawing software according to the shape of the box-shaped component;
(2) importing the initial stamping model into finite element analysis software, and carrying out grid division;
(3) defining mechanical property parameters, forming parameters and evaluation criteria of the plate;
(4) submitting to a solver for analysis, solution and calculation to obtain a component main strain distribution cloud picture, a secondary strain distribution cloud picture, a reduction rate distribution cloud picture and a porosity distribution cloud picture;
(5) according to the calculation result of the step (4), obtaining the deformation condition of the characteristic part of the box-shaped component, and determining a dangerous part; the characteristic parts of the box-shaped component comprise a flange area, a concave die fillet area, a convex die fillet area, a straight edge area, a box bottom area and a component fillet area;
(6) and evaluating the characteristic parts of the box-shaped component, wherein a flange area, a female die fillet area, a male die fillet area, a straight edge area and a box bottom area are evaluated by adopting a barrel drawing forming experiment, and a component fillet area is evaluated by adopting an bulging experiment.
Further, the professional drawing software in the step (1) is one of AUTOCAD, PRO/ENGINEER, UG/NX, SOLIDWORKS and CATIA.
Further, the initial stamping model in the step (1) is a curved surface model comprising a male die, a female die, a blank holder and a blank.
Further, the finite element software in the step (2) is one of DYNAFORM and ABAQUS.
Further, the mechanical property parameters of the plate in the step (3) comprise: material density, modulus of elasticity, poisson's ratio; the sheet forming parameters include: friction coefficient, forming temperature, blank pressing gap and concave-convex die gap.
Further, the density of the material obtained in the step (3) is 1.78g/cm3Elastic modulus 45GPa and Poisson's ratio 0.35; the forming temperature comprises the temperature of a female die of 200-400 ℃, the temperature of a male die of 200-400 ℃ and the ambient temperature of 20 ℃; the friction coefficient is 0.05-0.10, the blank holder gap is 1.05-1.15t, and the concave-convex mould gap is 1.05-1.15 t.
Further, the mechanical property parameters of the plate in the step (3) are obtained by adopting a unidirectional stretching experiment, wherein the temperature of the stretching experiment is 25-400 ℃; and the evaluation criterion adopts a microscopic damage model.
Further, the deformation condition of the box-shaped component characteristic part in the step (5) comprises the porosity, the thinning rate, the main strain and the secondary strain of the characteristic part.
Furthermore, the flange area, the die fillet area, the male die fillet area, the straight edge area and the box bottom area in the step (5) are stressed relatively uniformly, and the maximum strain and thinning positions of the non-component are not main failure parts; the stress state of the component fillet area is pulling-pulling, which is the maximum strain and thinning position of the box-shaped component, and is the main failure part of the component, namely the dangerous part.
Further, in the step (6), the drawing height of the magnesium plate cylindrical piece obtained by adopting a cylindrical piece drawing forming experiment is greater than the height of the box-shaped component, and the main strain and the secondary strain of the magnesium plate bulging component obtained by adopting a bulging experiment are respectively greater than the main strain and the secondary strain of the box-shaped component, and the magnesium plate bulging component is judged to be qualified; and the drawing height of the magnesium plate cylindrical piece obtained by adopting the cylindrical piece drawing forming experiment is less than or equal to the height of the box-shaped component, and/or the main strain and the secondary strain of the magnesium plate bulging component are respectively less than or equal to the main strain and the secondary strain of the box-shaped component, and the magnesium plate cylindrical piece is judged to be unqualified.
The invention has the beneficial technical effects that:
1. by adopting the forming simulation technology, the stress field, the strain field, the thickness change and the material flow rule of the material in the forming process can be visually seen, the dangerous part in the forming process of the component can be rapidly and accurately found, the dangerous part of the component is tested and evaluated, whether the plate meets the forming requirement can be judged in advance, the processes of die sinking, stamping forming tests and the like are omitted, and the development period and the cost of the product are greatly reduced.
2. The evaluation method of the magnesium alloy box-shaped component is clear, and the magnesium alloy plate for the 3C electronic shell is further standardized.
3. The evaluation method of the magnesium alloy plate is adopted, the blank of the evaluation method of the magnesium alloy plate for stamping forming is filled, support is provided for the preparation standard or specification of the magnesium alloy plate, the plate with the requirements is evaluated before delivery, and the quality of the product is guaranteed.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The method for evaluating the stamping forming performance of the magnesium alloy sheet material for preparing the box-shaped component comprises the following steps: defining the shape of a box-shaped component → establishing a model → dividing a grid → endowing the plate material with properties → calculating and solving → defining the dangerous part of the component → evaluating the forming performance of the component.
The characteristic parts of the box-shaped component comprise a flange area, a concave die fillet area, a convex die fillet area, a straight edge area, a box bottom area and a component fillet area.
Example 1
(1) The shape of the box-shaped component is as follows: length multiplied by width multiplied by height multiplied by 150 multiplied by 80 multiplied by 10mm, and bottom fillet radius R multiplied by 5 mm; the edge fillet R is 10 mm;
(2) establishing an initial stamping model (comprising a curved surface model of a male die, a female die, a blank holder and a blank) by adopting AUTOCAD according to the shape of the box-shaped component, importing ABAQUS software to establish a model, and dividing grids;
(3) endowing the plate material with the following properties: the stress-strain curve of the material and the density of the plate are 1.78g/cm3The thickness of the plate is 0.7mm, the elastic modulus is 45GPa, the Poisson ratio is 0.35, the temperature of the female die is 400 ℃, the temperature of the male die is 400 ℃, the environmental temperature is 20 ℃, the friction coefficient is 0.05, the blank pressing gap is 1.10t, and the gap of the male die and the female die is 1.10 t; model used for evaluation criteria: a microscopic damage model; the material performance parameters are obtained by adopting a unidirectional stretching experiment, and the stretching experiment temperature is 400 ℃;
(4) submitting to a solver for analysis, solution and calculation to obtain a component porosity distribution cloud picture, a reduction rate distribution cloud picture, a main strain distribution cloud picture and a secondary strain distribution cloud picture;
(5) comprehensively analyzing the porosity, the thinning rate, the main strain and the secondary strain of the characteristic part of the obtained box-shaped component according to the calculation result, determining that the round corner area of the component is a dangerous part, the stress state of the component is a pulling-pulling state, the position of the maximum porosity and the thinning rate of the component is the maximum stress strain and the thinning part under the pulling-pulling state, and therefore the component is judged to be a main failure part of the box-shaped component, and the maximum main strain and the secondary strain of the round corner area of the component are (0.228, 0.137);
(6) under the condition of 400 ℃, a cylindrical part drawing experiment is adopted to evaluate a box-shaped component flange area, a female die round angle area, a male die round angle area, a straight edge area and a box bottom area, the drawing height of the magnesium plate cylindrical part is more than 10mm, and all parts of the cylindrical part are not broken or failed and are judged to be qualified;
(7) under the condition of 400 ℃, the round corner area of the box-shaped component is evaluated by adopting a bulging test, the main strain and the secondary strain of the magnesium plate bulging component are (0.42, 0.25) > (0.228, 0.137), and the bulging piece does not crack or fail, so that the box-shaped component is judged to be qualified;
(8) and simultaneously, the evaluation requirements of the conditions (6) and (7) are met, and the plate is judged to meet the forming requirement of the box-shaped component.
Example 2
(1) The shape of the box-shaped component is as follows: length multiplied by width multiplied by height multiplied by 150 multiplied by 80 multiplied by 15mm, and bottom fillet radius R multiplied by 5 mm; the edge fillet R is 10 mm;
(2) adopting AUTOCAD to establish an initial stamping model according to the shape of the box-shaped component, importing ABAQUS software to establish a model, and dividing grids;
(3) endowing the plate material with the following properties: the stress-strain curve of the material and the density of the plate are 1.78g/cm3The thickness of the plate is 0.7mm, the elastic modulus is 45GPa, the Poisson ratio is 0.35, the temperature of the female die is 200 ℃, the temperature of the male die is 200 ℃, the temperature of the environment is 20 ℃, the friction coefficient is 0.09, the blank pressing gap is 1.05t, and the concave-convex die gap is 1.15 t; model used for evaluation criteria: a microscopic damage model; the material performance parameters are obtained by adopting a unidirectional stretching experiment, and the temperature of the stretching experiment is 200 ℃;
(4) submitting to a solver for analysis, solution and calculation to obtain a component porosity distribution cloud picture, a reduction rate distribution cloud picture, a main strain distribution cloud picture and a secondary strain distribution cloud picture;
(5) comprehensively analyzing the porosity, the thinning rate, the main strain and the secondary strain of the characteristic part of the obtained box-shaped component according to the calculation result, determining that the round corner of the component is a dangerous part, the stress state of the dangerous part is a pulling-pulling state, the position of the maximum porosity and the thinning rate of the component is the maximum stress strain and the thinning part under the pulling-pulling state, and therefore the dangerous part is judged to be a main failure part of the box-shaped component, and the maximum main strain and the secondary strain of the round corner area of the component are (0.530, 0.273);
(6) under the condition of 200 ℃, a cylindrical part drawing experiment is adopted to evaluate a box-shaped component flange area, a female die round angle area, a male die round angle area, a straight edge area and a box bottom area, the drawing height of the magnesium plate cylindrical part is 14mm < 15mm, the cylindrical part is broken and failed, and the judgment is unqualified;
(7) under the condition of 200 ℃, the round corner area of the box-shaped component is evaluated by adopting a bulging test, the main strain and the secondary strain of the magnesium plate bulging component are (0.405, 0.260) < (0.530, 0.273), and the bulging piece is broken and failed, and is judged to be unqualified;
(8) and judging that the plate does not meet the forming requirement of the box-shaped component.
Example 3
(1) The shape of the box-shaped component is as follows: length multiplied by width multiplied by height multiplied by 150 multiplied by 80 multiplied by 10mm, and bottom fillet radius R multiplied by 5 mm; the edge fillet R is 10 mm;
(2) adopting SOLIDWORKS to establish an initial stamping model according to the shape of the box-shaped component, introducing DYNAFORM software to establish the model, and dividing grids;
(3) endowing the plate material with the following properties: the stress-strain curve of the material and the density of the plate are 1.78g/cm3The thickness of the plate is 0.7mm, the elastic modulus is 45GPa, the Poisson ratio is 0.35, the temperature of the female die is 200 ℃, the temperature of the male die is 200 ℃, the ambient temperature is 20 ℃, the friction coefficient is 0.10, the blank pressing gap is 1.15t, and the concave-convex die gap is 1.05 t; model used for evaluation criteria: a microscopic damage model; the material performance parameters are obtained by adopting a unidirectional stretching experiment, and the temperature of the stretching experiment is 200 ℃;
(4) submitting to a solver for analysis, solution and calculation to obtain a component porosity distribution cloud picture, a reduction rate distribution cloud picture, a main strain distribution cloud picture and a secondary strain distribution cloud picture;
(5) according to the calculation result, comprehensively analyzing the porosity, the thinning rate, the main strain and the secondary strain of the characteristic part of the obtained box-shaped component, determining that the round corner of the component is a dangerous part, the stress state of the dangerous part is a pulling-pulling state, the position of the maximum porosity and the thinning rate of the component is the maximum stress strain and the thinning part under the pulling-pulling state, and therefore the dangerous part is judged to be a main failure part of the box-shaped component, and the maximum main strain and the secondary strain of the round corner area of the component are (0.210, 0.137);
(6) under the condition of 200 ℃, a cylindrical part drawing experiment is adopted to evaluate a box-shaped component flange area, a female die round angle area, a male die round angle area, a straight edge area and a box bottom area, the drawing height of the magnesium plate cylindrical part is 14mm and more than 10mm, and all parts of the cylindrical part are not broken or failed and are judged to be qualified;
(7) under the condition of 200 ℃, the round corner area of the box-shaped component is evaluated by adopting a bulging test, the main strain and the secondary strain of the magnesium plate bulging component are (0.405, 0.260) > (0.210, 0.137), and the bulging piece does not crack or fail, and is judged to be qualified;
(8) and simultaneously, the evaluation requirements of the conditions (6) and (7) are met, and the plate is judged to meet the forming requirement of the box-shaped component.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (10)
1. A method for evaluating press formability of a magnesium alloy sheet for producing a box-shaped member, comprising:
(1) establishing an initial stamping model by adopting professional drawing software according to the shape of the box-shaped component;
(2) importing the initial stamping model into finite element analysis software, and carrying out grid division;
(3) defining mechanical property parameters, forming parameters and evaluation criteria of the plate;
(4) submitting to a solver for analysis, solution and calculation to obtain a component main strain distribution cloud picture, a secondary strain distribution cloud picture, a reduction rate distribution cloud picture and a porosity distribution cloud picture;
(5) according to the calculation result of the step (4), obtaining the deformation condition of the characteristic part of the box-shaped component, and determining a dangerous part; the characteristic parts of the box-shaped component comprise a flange area, a concave die fillet area, a convex die fillet area, a straight edge area, a box bottom area and a component fillet area;
(6) and evaluating the characteristic parts of the box-shaped component, wherein a flange area, a female die fillet area, a male die fillet area, a straight edge area and a box bottom area are evaluated by adopting a barrel drawing forming experiment, and a component fillet area is evaluated by adopting an bulging experiment.
2. The evaluation method according to claim 1, wherein the professional drawing software of step (1) is one of AUTOCAD, PRO/ENGINEER, UG/NX, SOLIDWORKS, CATIA.
3. The method according to claim 1, wherein the initial stamping model of step (1) is a curved surface model comprising a punch, a die, a binder, and a blank.
4. The evaluation method according to claim 1, wherein the finite element software of step (2) is one of DYNAFORM and ABAQUS.
5. The evaluation method according to claim 1, wherein the mechanical property parameters of the sheet material in the step (3) comprise: material density, modulus of elasticity, poisson's ratio; the sheet forming parameters include: friction coefficient, forming temperature, blank pressing gap and concave-convex die gap.
6. The evaluation method according to claim 5, wherein the density of the material of the step (3) is 1.78g/cm3Elastic modulus 45GPa and Poisson's ratio 0.35; the forming temperature comprises the temperature of a female die of 200-400 ℃, the temperature of a male die of 200-400 ℃ and the ambient temperature of 20 ℃; the friction coefficient is 0.05-0.10, the blank holder gap is 1.05-1.15t, and the concave-convex mould gap is 1.05-1.15 t.
7. The evaluation method according to claim 1, wherein the mechanical property parameters of the plate in the step (3) are obtained by adopting a uniaxial tensile test, and the tensile test temperature is 25-400 ℃; and the evaluation criterion adopts a microscopic damage model.
8. The method of evaluating according to claim 1, wherein said deformation of the box-shaped component feature of step (5) comprises a porosity, a thinning rate, a primary strain and a secondary strain of the feature.
9. The method according to claim 1, wherein the stress state of the rounded corner region of the box-shaped member in step (5) is a pull-pull state, and the stress state is a maximum strain and a thinning position of the box-shaped member, and the stress state is a dangerous part.
10. The evaluation method according to claim 1, wherein in the step (6), the drawing height of the magnesium plate cylinder obtained by the cylinder drawing forming experiment is greater than the height of the box-shaped member, and the main strain and the secondary strain of the magnesium plate bulging member obtained by the bulging experiment are respectively greater than the main strain and the secondary strain of the box-shaped member, and the evaluation is judged to be qualified; and the drawing height of the magnesium plate cylindrical piece obtained by adopting the cylindrical piece drawing forming experiment is less than or equal to the height of the box-shaped component, and/or the main strain and the secondary strain of the magnesium plate bulging component are respectively less than or equal to the main strain and the secondary strain of the box-shaped component, and the magnesium plate cylindrical piece is judged to be unqualified.
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| CN115255074A (en) * | 2022-06-22 | 2022-11-01 | 扬州市管件厂有限公司 | Molding control method and system for nuclear-grade alloy steel elbow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115255074A (en) * | 2022-06-22 | 2022-11-01 | 扬州市管件厂有限公司 | Molding control method and system for nuclear-grade alloy steel elbow |
| CN115255074B (en) * | 2022-06-22 | 2023-05-23 | 扬州市管件厂有限公司 | Forming control method and system for nuclear grade alloy steel elbow |
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