CN113247403A - Bottom structure of extrusion-molded metal bottle and optimization method - Google Patents
Bottom structure of extrusion-molded metal bottle and optimization method Download PDFInfo
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- CN113247403A CN113247403A CN202110514983.0A CN202110514983A CN113247403A CN 113247403 A CN113247403 A CN 113247403A CN 202110514983 A CN202110514983 A CN 202110514983A CN 113247403 A CN113247403 A CN 113247403A
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- 239000002184 metal Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005457 optimization Methods 0.000 title claims abstract description 8
- 230000007704 transition Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 39
- 238000004364 calculation method Methods 0.000 claims description 24
- 238000001125 extrusion Methods 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000005094 computer simulation Methods 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 7
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- 238000009826 distribution Methods 0.000 description 6
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- 238000005259 measurement Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/40—Details of walls
- B65D1/42—Reinforcing or strengthening parts or members
- B65D1/46—Local reinforcements, e.g. adjacent closures
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- Containers Having Bodies Formed In One Piece (AREA)
Abstract
The invention provides a bottom structure of an extrusion-molded metal bottle and an optimization method, wherein the bottom structure of the extrusion-molded metal bottle comprises a bottom body, the bottom body is a centrally symmetrical revolving body, the revolving body is of a semi-closed cylindrical structure, the semi-closed cylindrical structure comprises a side wall section, a transition circular arc section, a slope structure section, a ground contact position section and an arching structure section which are sequentially arranged from top to bottom, a ground contact position is contained in the ground contact position section, and an overlapping part is arranged between the ground contact position section and the arching structure section; the bus of the side wall section is a vertical line, the bus of the transition circular arc section is a circular arc, the bus of the slope structure section is an inclined straight line from outside to inside, the bus of the ground contact part section is formed by turning and connecting two first-order Bezier curves at a ground contact point, and the bus of the arching structure section is formed by connecting two first-order Bezier curves from the ground contact point and a horizontal line close to an axis.
Description
Technical Field
The invention belongs to the technical field of packaging, and particularly relates to a bottom structure of an extrusion-molded metal bottle and an optimization method.
Background
At present, the extrusion-molded metal packaging bottle has wide market and application fields. The novel printing ink has the advantages of novel appearance, convenience for printing, high strength, difficulty in breaking, safety, sanitation, environmental friendliness, recyclability and the like. The application in the fields of beer beverages, daily chemical products, medicines and the like is more and more extensive.
The physical property requirements of the contents on the metal bottle are mainly axial bearing force and compressive strength. The axial bearing pressure refers to the maximum compressive force which can be axially borne when the bottle body is vertically placed. The pressure-resistant strength refers to the internal and external pressure difference when the bottle bottom expands and swells when the inside of the bottle body is filled with water or gas, and irreversible permanent deformation occurs, so that the bottle cannot be vertically placed.
The axial bearing pressure and the compression strength are closely related to the material strength, the wall thickness distribution of the bottle body, the structure of the bottle body and the like. Generally, the higher the strength of the material used and the thicker the wall thickness of the bottle body, the higher the axial bearing force and pressure resistance of the metal bottle. However, too high a material strength may result in reduced processability, increased energy consumption and increased rejection rate during processing. Too high wall thickness leads to increased material usage and thus increased cost, which is contrary to the trend of green, environmental protection and low carbon production. For the bottle body structure, the bottom structure has the greatest influence on the axial bearing pressure and the compressive strength. The existing products on the market generally increase the axial bearing force and the pressure resistance of the bottle body by arranging an inward-arched structure 1' at the bottom, as shown in fig. 1. A method of making an inwardly bowed structure 1', as shown in fig. 2, includes the steps of:
firstly, a metal disc 3 'is put into an extrusion die 4', and a punch 2 'is used for forming a cylindrical structure 6' with one sealed end in a reverse extrusion forming mode. The thickness distribution of the cylindrical structure 6 ' is mainly determined by the clearance between the punch 2 ' and the extrusion die 4 '.
Secondly, the cylindrical structure 6 'formed in the step I is placed into a stamping die 7', and a stamping head 5 'is used for forming the structure 1' with the arched bottom center part in a stamping mode. The thickness distribution of the structure 1 ' is mainly inherited from the step (i) to form the cylindrical structure 6 ', and the gap between the punch 5 ' and the stamping die 7 ' is matched with the thickness distribution of the cylindrical structure 6 '. Generally, the higher the arching height, the higher the axial bearing force and compressive strength. However, increasing the arching height increases the material usage and thus increases the cost, and also decreases the container volume, which must be compensated by increasing the bottle height to ensure the volume unchanged, thus further increasing the material usage; if the height of the arch bottom is increased without increasing the material consumption, the wall thickness of the bottom is reduced, so that the axial bearing force and the compressive strength are not improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a bottom structure of an extrusion forming metal bottle and an optimization method, which can increase the axial bearing force and the compressive strength of the bottle bottom on the premise of not changing the material formula, the material consumption, the volume of the bottle body, the diameter of the bottle body and the height of the bottle body.
The technical scheme adopted by the invention is as follows:
the utility model provides a bottom structure of extrusion forming metal bottle, includes the bottom body, the bottom body is centrosymmetric's solid of revolution, the solid of revolution is semi-closed tubular structure, its characterized in that: the semi-closed cylindrical structure comprises a side wall section, a transition arc section, a slope structure section, a grounding part section and an arch structure section which are sequentially arranged from top to bottom, wherein the grounding part section comprises a grounding point, and an overlapping part is arranged between the grounding part section and the arch structure section; the bus of the side wall section is a vertical line, the bus of the transition circular arc section is a circular arc, the bus of the slope structure section is an inclined straight line from outside to inside, the bus of the ground contact part section is formed by turning and connecting two first-order Bezier curves at a ground contact point, and the bus of the arching structure section is formed by connecting two first-order Bezier curves from the ground contact point and a horizontal line close to an axis. The invention can lead the metal bottle to have higher axial bearing force and compressive strength on the premise of not increasing the material consumption, changing the diameter and the height of the container and changing the volume of the container.
Further, the included angle between the slope structure section and the side wall section is alpha, and the included angle alpha is 5-30 degrees.
Furthermore, a tangent line at the joint of the two first-order Bezier curves of the arch structure section forms an included angle beta with the ground, and the included angle beta is 40-90 degrees.
Further, the distance between the center point of the arched structure section and the ground is 0.2-0.4 times of the radius of the semi-closed cylindrical structure.
Further, the radius of the transition circular arc section is 0-0.7 times of the radius of the semi-closed cylindrical structure.
Further, the length of a horizontal line of the arched structure section is 0-0.2 times of the radius of the semi-closed cylindrical structure.
Further, the material thickness of the side wall section is 0.006-0.025 times of the radius of the semi-closed cylindrical structure, the material thickness of the center point of the arch structure section is 1-3 times of the material thickness of the side wall section, the material thickness of the touch point is 1.2-5 times of the material thickness of the side wall section, and the material thickness of the rest sections is changed smoothly.
Furthermore, each section of the semi-closed cylindrical structure is in smooth transition of a curved surface.
The optimization method of the bottom structure of the extrusion-molded metal bottle comprises the following specific steps:
(1) carrying out simulation calculation on the bottom structure of the existing product, and taking the obtained calculation results of the axial bearing pressure and the compressive strength as reference standards;
(2) designing an initial model, and calculating axial bearing force and compressive strength;
(3) setting constraint conditions by taking key geometric parameters of the bottom structure as variables, changing numerical values of the geometric variables to obtain a new bottom structure model, and performing simulation calculation to obtain axial bearing pressure and compressive strength of the new bottom structure;
(4) comparing the obtained axial bearing pressure and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the relevance between the change direction of the geometric parameters and the change direction of the axial bearing pressure/compressive strength;
(5) repeated iterative calculation is carried out to obtain axial bearing force and compressive strength as high as possible, so that an optimized bottom structure is obtained;
(6) respectively designing a pair of extrusion dies and corresponding punches and a pair of stamping dies and corresponding punches by taking the optimized bottom structure as an approximation target and the material consumption of the optimized bottom structure as a constraint condition, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing the arch;
(7) taking the key geometric parameters of the extrusion die and the corresponding punch as variables, comparing the bottom structure obtained by calculation in the step (6) with the optimized bottom structure obtained by calculation in the step (5), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the thickness difference of the corresponding position;
(8) and (4) carrying out repeated iterative calculation, and finally, infinitely approaching the bottom structure formed by the two-step process of extrusion and stamping to the optimized bottom structure obtained in the step (5). The shape of the corresponding extrusion die and the corresponding punch, i.e. the optimized shape, can then be used to produce the optimized bottom structure obtained in step (5), which has as high an axial bearing force and compressive strength as possible.
Furthermore, the constraint conditions in the step (3) are that the material dosage is not changed, the volume of the bottle body is not changed, the diameter of the bottle body is not changed, and the height of the bottle body is not changed.
The invention has the beneficial effects that: under the premise of not changing the material formula, increasing the material dosage, changing the volume of the bottle body, changing the diameter of the bottle body and changing the height of the bottle body, the axial bearing force and the pressure-resistant strength of the bottle bottom are increased.
Drawings
Fig. 1 is a cross-sectional view of an extruded metal bottle having a conventional bottom structure.
Fig. 2 is a schematic view of a process for forming an extruded metal bottle having a conventional bottom structure.
Fig. 3 is a cross-sectional view of an extruded metal bottle having a base structure of the present invention.
Fig. 4 is a partially enlarged view of fig. 3, with a schematic view of the curves of the segments of the structure.
FIG. 5 is a second enlarged partial view of FIG. 3, with various critical dimension variables of the structure labeled.
FIG. 6 is a schematic view of the forming process of the present invention.
FIG. 7 is a stress cloud and force-time curve of computer simulation results of axial bearing testing of the present invention and conventional substructure.
FIG. 8 is a stress cloud and arch bottom center point displacement versus time curve of compressive strength test computer simulation results for the present invention and conventional bottom structures.
Fig. 9 shows the process of bottom failure inversion after compression as shown by the compressive strength test computer simulation results of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
Referring to fig. 3, 4 and 5, the present embodiment provides a bottom structure of an extrusion-molded metal bottle, including a bottom body 1, where the bottom body 1 is a centrally symmetric revolving body, the revolving body is a semi-closed cylindrical structure, the semi-closed cylindrical structure includes a side wall section ab, a transition arc section bc, a slope structure section cd, a ground contact section df, and an arch structure section eh, which are sequentially arranged from top to bottom, the ground contact section df includes a ground contact point e, an overlapping portion is provided between the ground contact section df and the arch structure section eh, and each section of the semi-closed cylindrical structure is a smooth curved surface transition; the generating line of side wall section ab is the vertical line, the generating line of transition circular arc section bc is the circular arc, the generating line of slope structure section cd is by outer upper inside down slope straight line, the generating line of ground portion section df that touches turns round and connects and form in touch place e by two sections one-order bessel curve de, ef, the generating line of hunch structure section eh is connected and forms by two sections one-order bessel curve ef, fg and one section horizontal line gh that is close to the axis that begin from touch place e. The invention can lead the metal bottle to have higher axial bearing force and compressive strength on the premise of not increasing the material consumption, changing the diameter and the height of the container and changing the volume of the container.
In this embodiment, an included angle between the slope structure section cd and the side wall section ab is α, and the included angle α is 5 ° to 30 °. The tangent line of the joint of the two first-order Bezier curves ef and fg of the arch structure section eh forms an included angle beta with the ground, and the included angle beta is 40-90 degrees. And the distance H between the central point H of the arch structure section eh and the ground is 0.2-0.4 times of the radius R of the semi-closed cylindrical structure. The radius R1 of the transition circular arc section bc is 0-0.7 times of the radius R of the semi-closed cylindrical structure. The length R2 of a horizontal line gh of the arched structure section eh is 0-0.2 times of the radius R of the semi-closed cylindrical structure.
In this embodiment, the material thickness T1 of the side wall section ab is 0.006 to 0.025 times of the radius R of the semi-closed tubular structure, the material thickness T5 of the center point h of the arch structure eh is 1 to 3 times of the material thickness T1 of the side wall section ab, the material thickness T3 of the touchdown point e is 1.2 to 5 times of the material thickness T1 of the side wall section ab, and the material thicknesses of the remaining sections vary smoothly.
Specifically, the radius R of the semi-closed cylindrical structure is 29.5mm, the distance H between the center point H of the arched structure section eh and the ground is 7.2mm, the radius R1 of the transition circular arc section bc is 12mm, and the length R2 of the horizontal line gh of the arched structure section eh is 0.5 mm. The vertical distance L1 between the touchdown point e and the side wall section ab is 5mm, the horizontal distance L2 between the touchdown point e and the curve connecting point f is 6.15mm, and the horizontal distance L3 between the curve connecting point f and the central symmetry axis 2 is 18.35 mm. The included angle alpha between the slope structure section cd and the side wall section ab is 18 degrees, and the included angle beta between the tangent line of the joint of the curve ef and the curve fg and the ground is 60 degrees. The wall thickness T1 of the side wall segment ab is 0.4mm, the wall thickness T5 at the center point h is 0.8mm, the wall thickness T3 at the contact point e is 1.0mm, the wall thickness T2 at the d point is 0.57mm, the wall thickness T4 at the f point is 0.86mm, and the wall thicknesses at the other positions are uniformly increased.
Referring to fig. 6, the manufacturing method of the present invention includes the following steps:
the method comprises the following steps: the metal wafer 4 is placed into an extrusion die 5, a punch 3 is used for forming a cylindrical structure 7 with one sealed end and an inclined structure section cd at the bottom in a reverse extrusion forming mode, and the forming is carried out in the step, and the wall thickness distribution of the bottom structure is mainly formed in the step.
Secondly, the step of: the cylindrical structure 7 formed in the step (i) is placed in a punching die 8, and the structure 1 with the bottom center portion arched is formed by punching with a punch 6.
The main difference between the present invention and the conventional structure of the bottom of the existing product is that the present invention has a distinct slope structure, whereas the conventional structure does not. In the present invention, the distance from the touchdown point e to the central symmetry axis 2 is smaller than that in the conventional structure. The structure and the wall thickness distribution of the invention are optimized, and higher axial bearing pressure and compressive strength are obtained.
Example two
The embodiment provides an optimization method of the bottom structure of the extrusion-molded metal bottle, which comprises the following specific steps:
(1) carrying out simulation calculation on the bottom structure of the existing product, and taking the obtained calculation results of the axial bearing pressure and the compressive strength as reference standards;
(2) designing an initial model, and calculating axial bearing force and compressive strength;
(3) setting the key geometric parameters of the bottom structure as variables, setting the constraint conditions of constant material consumption, constant bottle volume, constant bottle diameter and constant bottle height, changing the numerical values of the geometric variables to obtain a new bottom structure model, and performing simulation calculation to obtain the axial bearing pressure and the compressive strength of the new bottom structure;
(4) comparing the obtained axial bearing pressure and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the relevance between the change direction of the geometric parameters and the change direction of the axial bearing pressure/compressive strength;
(5) repeated iterative calculation is carried out to obtain axial bearing force and compressive strength as high as possible, so that an optimized bottom structure is obtained;
(6) respectively designing a pair of extrusion dies and corresponding punches and a pair of stamping dies and corresponding punches by taking the optimized bottom structure as an approximation target and the material consumption of the optimized bottom structure as a constraint condition, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing the arch;
(7) taking the key geometric parameters of the extrusion die and the corresponding punch as variables, comparing the bottom structure obtained by calculation in the step (6) with the optimized bottom structure obtained by calculation in the step (5), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the thickness difference of the corresponding position;
(8) and (4) carrying out repeated iterative calculation, and finally, infinitely approaching the bottom structure formed by the two-step process of extrusion and stamping to the optimized bottom structure obtained in the step (5). The shape of the corresponding extrusion die and the corresponding punch, i.e. the optimized shape, can then be used to produce the optimized bottom structure obtained in step (5), which has as high an axial bearing force and compressive strength as possible.
The invention can lead the metal bottle to have higher axial bearing force and compressive strength on the premise of not increasing the material consumption, changing the diameter and the height of the container and changing the volume of the container.
The bottom structure of the conventional structure and the bottom structure of the first embodiment were simulated and modeled, respectively, using a computer simulation analysis method, and the axial bearing pressure (fig. 7) and compressive strength (fig. 8, 9) thereof were calculated, respectively. Using the manufacturing method, a product object having a bottom structure of a conventional structure and a bottom structure of example one was manufactured and tested for axial bearing pressure and compressive strength, respectively. The results are shown in Table 1. The difference between the calculated value and the measured value of the same structure may be caused by inaccurate data of the material recorded by simulation calculation, but the difference and judgment of the relative size are not influenced.
TABLE 1
| Item | Bottom structure of conventional structure | Optimized bottom structure |
| Axial bearing force/calculation | 4.14kN | 4.80kN |
| Axial bearing force/actual measurement | 4.40kN | 5.10kN |
| Compressive Strength/calculation | 0.96MPa | 1.59MPa |
| Compressive Strength/actual measurement | 1.10MPa | 1.80MPa |
As can be seen from Table 1, the optimized bottom structure has high axial bearing pressure and compressive strength.
The present invention is not limited to the above-described embodiments, and various modifications or variations of the present invention are within the spirit and scope of the present invention, and the present invention is also intended to include such modifications and variations provided they are within the scope of the claims and the equivalent technology of the present invention.
Claims (10)
1. The utility model provides a bottom structure of extrusion forming metal bottle, includes the bottom body, the bottom body is centrosymmetric's solid of revolution, the solid of revolution is semi-closed tubular structure, its characterized in that: the semi-closed cylindrical structure comprises a side wall section, a transition arc section, a slope structure section, a grounding part section and an arch structure section which are sequentially arranged from top to bottom, wherein the grounding part section comprises a grounding point, and an overlapping part is arranged between the grounding part section and the arch structure section; the bus of the side wall section is a vertical line, the bus of the transition circular arc section is a circular arc, the bus of the slope structure section is an inclined straight line from outside to inside, the bus of the ground contact part section is formed by turning and connecting two first-order Bezier curves at a ground contact point, and the bus of the arching structure section is formed by connecting two first-order Bezier curves from the ground contact point and a horizontal line close to an axis.
2. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the included angle between the slope structure section and the side wall section is alpha, and the included angle alpha is 5-30 degrees.
3. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the tangent line of the joint of the two first-order Bezier curves of the arch structure section forms an included angle beta with the ground, and the included angle beta is 40-90 degrees.
4. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the distance between the center point of the arched structure section and the ground is 0.2-0.4 times of the radius of the semi-closed cylindrical structure.
5. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the radius of the transition circular arc section is 0-0.7 times of the radius of the semi-closed cylindrical structure.
6. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the length of a horizontal line of the arched structure section is 0-0.2 times of the radius of the semi-closed cylindrical structure.
7. A bottom structure of an extruded metal bottle as claimed in claim 1, wherein: the material thickness of the side wall section is 0.006-0.025 times of the radius of the semi-closed cylindrical structure, the material thickness of the center point of the arch structure section is 1-3 times of the material thickness of the side wall section, the material thickness of the touch point is 1.2-5 times of the material thickness of the side wall section, and the material thickness of the rest sections is changed smoothly.
8. The bottom structure of an extruded metal bottle as claimed in any one of claims 1 to 7, wherein: each section of the semi-closed cylindrical structure is in smooth transition of a curved surface.
9. The method for optimizing the bottom structure of an extruded metal bottle as claimed in claim 1, comprising the following steps:
(1) carrying out simulation calculation on the bottom structure of the existing product, and taking the obtained calculation results of the axial bearing pressure and the compressive strength as reference standards;
(2) designing an initial model, and calculating axial bearing force and compressive strength;
(3) setting constraint conditions by taking key geometric parameters of the bottom structure as variables, changing numerical values of the geometric variables to obtain a new bottom structure model, and performing simulation calculation to obtain axial bearing pressure and compressive strength of the new bottom structure;
(4) comparing the obtained axial bearing pressure and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the relevance between the change direction of the geometric parameters and the change direction of the axial bearing pressure/compressive strength;
(5) repeated iterative calculation is carried out to obtain axial bearing force and compressive strength as high as possible, so that an optimized bottom structure is obtained;
(6) respectively designing a pair of extrusion dies and corresponding punches and a pair of stamping dies and corresponding punches by taking the optimized bottom structure as an approximation target and the material consumption of the optimized bottom structure as a constraint condition, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing the arch;
(7) taking the key geometric parameters of the extrusion die and the corresponding punch as variables, comparing the bottom structure obtained by calculation in the step (6) with the optimized bottom structure obtained by calculation in the step (5), and determining the change direction of the corresponding geometric parameters in the next iteration step according to the thickness difference of the corresponding position;
(8) and (4) carrying out repeated iterative calculation, and finally, infinitely approaching the bottom structure formed by the two-step process of extrusion and stamping to the optimized bottom structure obtained in the step (5).
10. The optimization method according to claim 9, characterized in that: the constraint conditions in the step (3) are that the material dosage is unchanged, the volume of the bottle body is unchanged, the diameter of the bottle body is unchanged, and the height of the bottle body is unchanged.
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| CN202110514983.0A CN113247403B (en) | 2021-05-12 | 2021-05-12 | Bottom structure of extrusion molding metal bottle and optimization method |
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| CN202110514983.0A CN113247403B (en) | 2021-05-12 | 2021-05-12 | Bottom structure of extrusion molding metal bottle and optimization method |
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| CN113247403A true CN113247403A (en) | 2021-08-13 |
| CN113247403B CN113247403B (en) | 2024-05-14 |
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| CN202110514983.0A Active CN113247403B (en) | 2021-05-12 | 2021-05-12 | Bottom structure of extrusion molding metal bottle and optimization method |
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| US20180042413A1 (en) * | 2016-08-12 | 2018-02-15 | Ahmed Thaher Althaher | Cup lid with wide drinking edge and interior baffle wall |
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| US20180042413A1 (en) * | 2016-08-12 | 2018-02-15 | Ahmed Thaher Althaher | Cup lid with wide drinking edge and interior baffle wall |
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| CN113247403B (en) | 2024-05-14 |
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