CN113247403B - Bottom structure of extrusion molding metal bottle and optimization method - Google Patents
Bottom structure of extrusion molding metal bottle and optimization method Download PDFInfo
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- CN113247403B CN113247403B CN202110514983.0A CN202110514983A CN113247403B CN 113247403 B CN113247403 B CN 113247403B CN 202110514983 A CN202110514983 A CN 202110514983A CN 113247403 B CN113247403 B CN 113247403B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 32
- 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 16
- 239000000463 material Substances 0.000 claims description 39
- 238000004364 calculation method Methods 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
- 230000008859 change Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
The invention provides a bottom structure of an extrusion molding metal bottle and an optimization method, wherein the bottom structure of the extrusion molding metal bottle comprises a bottom body, wherein the bottom body is a central symmetry revolving body, the revolving body is of a semi-closed tubular structure, the semi-closed tubular 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, 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 bar of the side wall section is a vertical line, the bus bar of the transition arc section is an arc, the bus bar of the slope structure section is an inclined straight line from outside to inside, the bus bar of the ground contact section is formed by turning and connecting two sections of first-order Bezier curves at the ground contact point, and the bus bar of the arch structure section is formed by connecting two sections of first-order Bezier curves from the ground contact point and a section of horizontal line close to the axis.
Description
Technical Field
The invention belongs to the technical field of packaging, and particularly relates to a bottom structure of an extrusion molding metal bottle and an optimization method.
Background
At present, the extrusion molding metal packaging bottle has wide market and application fields. The printing ink has the advantages of novel appearance, convenient printing, high strength, difficult breaking, safety, sanitation, environmental protection, recycling and the like. The application in the fields of beer beverage, daily chemical products, medicines and the like is becoming wider and wider.
The physical properties of the contents on the metal bottle are mainly axial bearing force and compressive strength. The axial bearing force refers to the maximum compressive force that the bottle body can bear in the axial direction when being placed vertically. The compressive strength refers to the corresponding internal and external pressure difference when the bottle bottom is expanded and swelled to generate irreversible permanent deformation and can not be vertically placed when the bottle body is filled with water or inflated.
The axial bearing force and the compressive strength are closely related to the material strength, the wall thickness distribution of the bottle body, the bottle body structure and the like. In general, the higher the strength of the material used, the thicker the wall thickness of the bottle body, and the higher the axial bearing and compressive strength of the metal bottle. However, too high a material strength can result in reduced processability and increased energy consumption and rejection rate during processing. Too high a wall thickness can result in increased material usage and thus increased costs, contrary to the trend of green, environmentally friendly, low carbon production. For bottle structures, the bottom structure has the greatest impact on bearing pressure and compressive strength. The existing products on the market generally increase the axial bearing force and compressive strength of the bottle body by providing an inwardly arched structure 1' at the bottom, as shown in fig. 1. The method for manufacturing the inward arch structure 1', as shown in fig. 2, comprises the following steps:
① The metal disc 3 'is put into an extrusion die 4', and a cylindrical structure 6 'with one end sealed is formed by a punch 2' in a back extrusion molding mode. The thickness distribution of the cylindrical structure 6 ' is mainly determined by the gap between the punch 2 ' and the extrusion die 4 '.
② The cylindrical structure 6 ' formed in the step ① ' is placed in a press die 7 ', and the bottom center portion arched structure 1 ' is formed by a punch 5 ' in a press manner. The thickness distribution of the structure 1 ' is mainly inherited from the formation of the cylindrical structure 6 ' in step ①, and the clearance between the punch 5 ' and the stamping die 7 ' should be matched with the thickness distribution of the cylindrical structure 6 '. Generally, the higher the camber, the higher the axial bearing force and compressive strength. However, increasing the arch height increases the material consumption and further increases the cost, and also reduces the volume of the container, and in order to ensure the volume is unchanged, the material consumption is further increased by compensating the container by increasing the height of the bottle body and the like; if the arch bottom height is increased without increasing the material consumption, the wall thickness of the bottom is reduced, thereby being unfavorable for improving the axial bearing force and the compressive strength.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a bottom structure and an optimization method of an extrusion molding metal bottle, which can increase the axial bearing force and the compressive strength of the bottom of the bottle on the premise of not changing the material formula, not increasing the material consumption, not changing the volume of the bottle, not changing the diameter of the bottle and not changing the height of the bottle.
The technical scheme adopted by the invention is as follows:
The utility model provides a bottom structure of extrusion metal bottle, includes the bottom body, the bottom body is the solid of revolution of central symmetry, the solid of revolution is semi-closed tubular structure, its characterized in that: the semi-closed tubular structure comprises a side wall section, a transition circular 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 bar of the side wall section is a vertical line, the bus bar of the transition arc section is an arc, the bus bar of the slope structure section is an inclined straight line from outside to inside, the bus bar of the ground contact section is formed by turning and connecting two sections of first-order Bezier curves at the ground contact point, and the bus bar of the arch structure section is formed by connecting two sections of first-order Bezier curves from the ground contact point and a section of horizontal line close to the axis. The invention can make the metal bottle have higher axial bearing force and compressive strength under the precondition of not increasing the material consumption, not changing the diameter and the height of the container and not 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.
Further, the tangent line at the joint of the two first-order Bezier curves of the arch structural 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 arc section is 0 to 0.7 times of the radius of the semi-closed cylindrical structure.
Further, the length of the horizontal line of the arched structure section is 0 to 0.2 times 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 arched structure section is 1-3 times of the material thickness of the side wall section, the material thickness of the grounding point is 1.2-5 times of the material thickness of the side wall section, and the material thicknesses of the rest sections change smoothly.
Further, each section of the semi-closed tubular structure is in curved smooth transition.
The optimization method of the bottom structure of the extrusion molding metal bottle comprises the following specific steps:
(1) Performing simulation calculation on the bottom structure of the existing product, and taking the obtained axial bearing force and compressive strength calculation result as a reference standard;
(2) Designing an initial model, and calculating the axial bearing force and the compressive strength;
(3) Setting constraint conditions by taking key geometric parameters of the bottom structure as variables, changing the numerical value of the geometric variables to obtain a new bottom structure model, and performing simulation calculation to obtain the axial bearing force and the compressive strength of the new bottom structure;
(4) Comparing the obtained axial bearing force and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the changing direction of the corresponding geometric parameter in the next iteration step according to the relevance of the changing direction of the geometric parameter and the changing direction of the axial bearing force/compressive strength;
(5) Repeated iterative computation is carried out to obtain the axial bearing force and compressive strength which are as high as possible, so that an optimized bottom structure is obtained;
(6) Taking the optimized bottom structure as an approximation target, taking the material consumption of the optimized bottom structure as a constraint condition, respectively designing a pair of extrusion dies and corresponding punches, and a pair of stamping dies and corresponding punches, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing arches;
(7) The key geometric parameters of the extrusion die and the corresponding punch are used as variables, the bottom structure calculated in the step (6) is compared with the optimized bottom structure calculated in the step (5), and the change direction of the corresponding geometric parameters in the next iteration step is determined according to the thickness difference of the corresponding positions;
(8) And (3) performing repeated iterative computation, and finally enabling the bottom structure formed by the extrusion and stamping two-step process to infinitely approximate 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 for manufacturing the optimized bottom structure obtained in step (5), which has as high an axial bearing force and a compressive strength as possible.
Further, the constraint condition in the step (3) is that the material consumption is unchanged, the bottle volume is unchanged, the bottle diameter is unchanged, and the bottle height is unchanged.
The invention has the beneficial effects that: the axial bearing force and the compressive strength of the bottle bottom are increased on the premise of not changing the material formula, not increasing the material consumption, not changing the volume of the bottle body, not changing the diameter of the bottle body and not changing the height of the bottle body.
Drawings
Fig. 1 is a cross-sectional view of an extruded metal bottle having a conventional bottom structure.
Fig. 2 is a schematic illustration of a molding process for extrusion molded metal bottles 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 an enlarged view of a portion of fig. 3, labeled with a schematic representation of the various sections of the structure.
FIG. 5 is a partial enlarged view of FIG. 3, labeled with a schematic representation of various critical dimension variables of the structure.
Fig. 6 is a schematic diagram of the molding process of the present invention.
FIG. 7 is a stress cloud and force versus time plot of the results of a computer simulation of the axial bearing test of the present invention with a conventional base structure.
FIG. 8 is a stress cloud and arch bottom center displacement versus time plot of the results of a computer simulation of the compressive strength test of the present invention with a conventional bottom structure.
FIG. 9 is a graph showing the process of bottom failure flip after compression as shown by the results of the compressive strength test computer simulation of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples, without limiting the invention to these specific embodiments. It will be appreciated by those skilled in the art that the 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 should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Example 1
Referring to fig. 3, 4 and 5, the embodiment provides a bottom structure of an extrusion molding metal bottle, which comprises a bottom body 1, wherein the bottom body 1 is a central symmetry revolving body, the revolving body is a semi-closed tubular structure, the semi-closed tubular structure comprises a side wall section ab, a transition arc section bc, a slope structure section cd, a ground contact part section df and an arch structure section eh which are sequentially arranged from top to bottom, the ground contact part section df comprises a ground contact point e, an overlapping part is arranged between the ground contact part section df and the arch structure section eh, and each section of the semi-closed tubular structure is in curved smooth transition; the bus bar of the side wall section ab is a vertical line, the bus bar of the transition arc section bc is an arc, the bus bar of the slope structure section cd is an inclined straight line from outside to inside, the bus bar of the ground contact section df is formed by turning and connecting two sections of first-order Bezier curves de and ef at the ground contact point e, and the bus bar of the arch structure section eh is formed by connecting two sections of first-order Bezier curves ef and fg from the ground contact point e and a horizontal line gh close to the axis. The invention can make the metal bottle have higher axial bearing force and compressive strength under the precondition of not increasing the material consumption, not changing the diameter and the height of the container and not changing the volume of the container.
In this embodiment, the included angle between the slope structural section cd and the side wall section ab is α, and the included angle α is 5 ° to 30 °. The tangent line at the joint of the two first-order Bezier curves ef and fg of the arch structural section eh forms an included angle beta with the ground, and the included angle beta is 40-90 degrees. The distance H between the center point H of the arched 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 arc section bc is 0-0.7 times of the radius R of the semi-closed cylindrical structure. The length R2 of the horizontal line gh of the arched structure section eh is 0 to 0.2 times of the radius R of the semi-closed tubular structure.
In this embodiment, the material thickness T1 of the sidewall segment ab is 0.006-0.025 times the radius R of the semi-closed tubular structure, the material thickness T5 of the center point h of the arch structure segment eh is 1-3 times the material thickness T1 of the sidewall segment ab, the material thickness T3 of the grounding point e is 1.2-5 times the material thickness T1 of the sidewall segment ab, and the material thicknesses of the rest segments smoothly change.
Specifically, the radius r=29.5 mm of the semi-closed cylindrical structure, the distance H between the center point H of the arched structure section eh and the ground is=7.2 mm, the radius r1=12 mm of the transition arc section bc, and the length r2=0.5 mm of the horizontal line gh of the arched structure section eh. The vertical distance l1=5 mm between the ground point e and the side wall section ab, the horizontal distance l2=6.15 mm between the ground point e and the curved line phase point f, and the horizontal distance l3=18.35 mm between the curved line phase point f and the central symmetry axis 2. The included angle alpha=18° between the slope structure section cd and the side wall section ab, and the included angle beta=60° between the tangent line at the junction of the curve ef and the curve fg and the ground. Wall thickness t1=0.4 mm for sidewall section ab, t5=0.8 mm for center point h, t3=1.0 mm for ground point e, t2=0.57 mm for d point, t4=0.86 mm for f point, and the rest of the wall thickness transitions uniformly.
Referring to fig. 6, the manufacturing method of the present invention comprises the following steps:
① : the metal disc 4 is placed in an extrusion die 5, a cylindrical structure 7 with one end sealed is formed by a punch 3 in a back extrusion forming mode, the inclined structure section cd at the bottom is formed in this step, and the wall thickness distribution of the bottom structure is also mainly formed in this step.
② : The tubular structure 7 formed in the step ① is placed in a stamping die 8, and the bottom center portion of the arched structure 1 is formed by stamping through 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 an obvious 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 force and compressive strength are obtained.
Example two
The embodiment provides an optimization method for the bottom structure of the extrusion molding metal bottle, which specifically comprises the following steps:
(1) Performing simulation calculation on the bottom structure of the existing product, and taking the obtained axial bearing force and compressive strength calculation result as a reference standard;
(2) Designing an initial model, and calculating the axial bearing force and the compressive strength;
(3) The key geometric parameters of the bottom structure are used as variables, the material consumption is unchanged, the bottle volume is unchanged, the bottle diameter is unchanged, the bottle height is unchanged as constraint conditions, the numerical value of the geometric variables is changed, a new bottom structure model is obtained, and simulation calculation is carried out to obtain the axial bearing force and the compressive strength of the new bottom structure;
(4) Comparing the obtained axial bearing force and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the changing direction of the corresponding geometric parameter in the next iteration step according to the relevance of the changing direction of the geometric parameter and the changing direction of the axial bearing force/compressive strength;
(5) Repeated iterative computation is carried out to obtain the axial bearing force and compressive strength which are as high as possible, so that an optimized bottom structure is obtained;
(6) Taking the optimized bottom structure as an approximation target, taking the material consumption of the optimized bottom structure as a constraint condition, respectively designing a pair of extrusion dies and corresponding punches, and a pair of stamping dies and corresponding punches, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing arches;
(7) The key geometric parameters of the extrusion die and the corresponding punch are used as variables, the bottom structure calculated in the step (6) is compared with the optimized bottom structure calculated in the step (5), and the change direction of the corresponding geometric parameters in the next iteration step is determined according to the thickness difference of the corresponding positions;
(8) And (3) performing repeated iterative computation, and finally enabling the bottom structure formed by the extrusion and stamping two-step process to infinitely approximate 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 for manufacturing the optimized bottom structure obtained in step (5), which has as high an axial bearing force and a compressive strength as possible.
The invention can make the metal bottle have higher axial bearing force and compressive strength under the precondition of not increasing the material consumption, not changing the diameter and the height of the container and not changing the volume of the container.
The bottom structure of the conventional structure and the bottom structure described in embodiment one were simulated and modeled, respectively, using a computer simulation analysis method, and the axial bearing force (fig. 7) and compressive strength (fig. 8, 9) thereof were calculated, respectively. Using the manufacturing method, a product object having a base structure of a conventional structure and a base structure of embodiment one was manufactured and tested for its axial bearing force and compressive strength, respectively. The results are shown in Table 1. Wherein, the difference between the calculated value and the measured value of the same structure may be caused by inaccuracy of material data recorded by simulation calculation, but the difference and judgment of relative sizes are not affected.
TABLE 1
| Project | 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 higher axial bearing force and compressive strength.
The present invention is not limited to the above-described embodiments, and it is intended that the present invention also includes various modifications and variations of the present invention provided that they fall within the scope of the claims and the equivalents thereof.
Claims (10)
1. The utility model provides a bottom structure of extrusion metal bottle, includes the bottom body, the bottom body is the solid of revolution of central symmetry, the solid of revolution is semi-closed tubular structure, its characterized in that: the semi-closed tubular structure comprises a side wall section, a transition circular 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 bar of the side wall section is a vertical line, the bus bar of the transition arc section is an arc, the bus bar of the slope structure section is an inclined straight line from outside to inside, the bus bar of the ground contact section is formed by turning and connecting two sections of first-order Bezier curves at the ground contact point, and the bus bar of the arch structure section is formed by connecting two sections of first-order Bezier curves from the ground contact point and a section of horizontal line close to the axis.
2. The base structure of an extruded metal bottle of 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. The base structure of an extruded metal bottle of claim 1, wherein: the tangent line at the joint of the two first-order Bezier curves of the arch structural section forms an included angle beta with the ground, and the included angle beta is 40-90 degrees.
4. The base structure of an extruded metal bottle of claim 1, wherein: the distance between the central 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. The base structure of an extruded metal bottle of 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. The base structure of an extruded metal bottle of claim 1, wherein: the length of the horizontal line of the arched structure section is 0-0.2 times of the radius of the semi-closed cylindrical structure.
7. The base structure of an extruded metal bottle of claim 1, wherein: the thickness of the material of the side wall section is 0.006-0.025 times of the radius of the semi-closed cylindrical structure, the thickness of the material of the center point of the arch structure section is 1-3 times of the thickness of the material of the side wall section, the thickness of the material of the grounding point is 1.2-5 times of the thickness of the material of the side wall section, and the thicknesses of the materials of the other sections change smoothly.
8. A base structure for 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 curved surface smooth transition.
9. The method for optimizing the bottom structure of an extruded metal bottle according to claim 1, comprising the specific steps of:
(1) Performing simulation calculation on the bottom structure of the existing product, and taking the obtained axial bearing force and compressive strength calculation result as a reference standard;
(2) Designing an initial model, and calculating the axial bearing force and the compressive strength;
(3) Setting constraint conditions by taking key geometric parameters of the bottom structure as variables, changing the numerical value of the geometric variables to obtain a new bottom structure model, and performing simulation calculation to obtain the axial bearing force and the compressive strength of the new bottom structure;
(4) Comparing the obtained axial bearing force and compressive strength of the new bottom structure with the reference standard in the step (1), and determining the changing direction of the corresponding geometric parameter in the next iteration step according to the relevance of the changing direction of the geometric parameter and the changing direction of the axial bearing force/compressive strength;
(5) Repeated iterative computation is carried out to obtain the axial bearing force and compressive strength which are as high as possible, so that an optimized bottom structure is obtained;
(6) Taking the optimized bottom structure as an approximation target, taking the material consumption of the optimized bottom structure as a constraint condition, respectively designing a pair of extrusion dies and corresponding punches, and a pair of stamping dies and corresponding punches, and calculating an extrusion forming process and a stamping forming process by using a computer simulation method to obtain a bottom structure containing arches;
(7) The key geometric parameters of the extrusion die and the corresponding punch are used as variables, the bottom structure calculated in the step (6) is compared with the optimized bottom structure calculated in the step (5), and the change direction of the corresponding geometric parameters in the next iteration step is determined according to the thickness difference of the corresponding positions;
(8) And (3) performing repeated iterative computation, and finally enabling the bottom structure formed by the extrusion and stamping two-step process to infinitely approximate 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 consumption is unchanged, the bottle volume is unchanged, the bottle diameter is unchanged, and the bottle height 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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Citations (12)
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| CN113247403A (en) | 2021-08-13 |
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