A method of forming a conical aluminium cup

Abstract

The application discloses a conical aluminum cup forming method, which comprises the following steps: S1, forming aluminum material into a cylindrical aluminum cup semi-product; S2, stretching the aluminum cup semi-product multiple times to increase the height and reduce the diameter of the aluminum cup semi-product; S3, stretching the aluminum cup semi-product again to thin the cup wall thickness of the aluminum cup semi-product and form an outwardly flared flange on the top end of the aluminum cup semi-product; S4, stretching the aluminum cup semi-product again to form a first stage on the cup wall of the upper part of the aluminum cup semi-product, and at least one straight wall stage is formed in the first stage; S5, stretching the aluminum cup semi-product again to form multiple conical wall stages on the part of the cup wall below the first stage, and the multiple conical wall stages are gradually inwardly tapered downwards; and S6, unfolding the multiple conical wall stages into one large conical surface. The application can ensure the use strength and make the aluminum cup have a thinner cup wall.

Description

Technical Field

[0001] This invention relates to the field of disposable aluminum cup forming technology, and in particular to a method for forming a conical aluminum cup. Background Technology

[0002] How long should a disposable paper cup be filled with water before the water soaks through and affects its normal use? Currently, some paper cups have a waterproof coating inside, which can slow down the soaking to some extent, but this poses safety issues and can easily cause environmental pollution.

[0003] Therefore, disposable aluminum cups were developed. Aluminum is not permeable to water, can hold hot water, is safer to use, has higher strength, and can be recycled, making it more environmentally friendly. However, while ensuring the strength of the cups, how to process them to make the walls thinner to reduce costs has become a problem that the industry is vying to study. Summary of the Invention

[0004] The purpose of this invention is to provide a method for forming a conical aluminum cup, which overcomes the above-mentioned defects and enables the aluminum cup to form a thinner cup wall while ensuring its strength.

[0005] To achieve the above objectives, the solution of the present invention is: a method for forming a conical aluminum cup, the method comprising the following steps:

[0006] S1. To form the aluminum material into a cylindrical aluminum cup semi-finished product;

[0007] S2. The aluminum cup semi-finished product is stretched multiple times to increase its height and decrease its diameter.

[0008] S3. Stretch the aluminum cup semi-finished product again to reduce the thickness of the cup wall and make the cup mouth at the top of the aluminum cup semi-finished product form an outward-expanding flange edge.

[0009] S4. Stretch the aluminum cup semi-finished product again so that the upper part of the cup wall of the aluminum cup semi-finished product forms the first stage, and at least one straight wall step is formed in the first stage.

[0010] S5. Stretch the aluminum cup semi-finished product again to form a multi-level conical wall step in the part of the cup wall below the first stage, and the multi-level conical wall step gradually tapers downward and inward.

[0011] S6. Unfold the multi-level conical wall steps into a single large conical surface.

[0012] Furthermore, after step S6, the aluminum cup semi-finished product is shaped using a contour mold.

[0013] Furthermore, after step S6, a second stage is shaped below the large conical surface, the second stage including at least one downwardly tapering conical wall step.

[0014] Furthermore, after step S6, the straight wall steps in the first stage are reshaped into conical wall steps that taper inwards downwards.

[0015] Furthermore, after step S6, a recess is pressed upward from the bottom side of the aluminum cup semi-finished product.

[0016] Furthermore, the bottom of the pit is an arc surface or a plane.

[0017] Furthermore, in step S6, the flange edge is rolled into a rounded corner.

[0018] Furthermore, in step S1, the aluminum cup semi-finished product is formed by extruding and then shearing the aluminum material.

[0019] Furthermore, in step S5, a straight wall segment is formed on the upper and / or lower side of each of the conical wall steps. The intersection of the top edge of each conical wall step and the adjacent straight wall segment is a convex inflection point. Each convex inflection point is located on the large conical surface formed in step S6.

[0020] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0021] (1) Before starting the shaping steps of S4-S6, the aluminum cup semi-finished product is stretched by S2 to give it a predetermined height and diameter. Then, the thickness of the cup wall is reduced by step S3 so that after the shaping of S4-S6, a cup wall with uniform thickness and thinner thickness can be formed.

[0022] (2) The first stage formed by step S4 enhances the strength of the cup mouth;

[0023] (2) Through steps S5 and S6, the cup wall is first made into a multi-level small conical wall step, and then the multi-level small conical wall step is unfolded to form a large conical surface. This can effectively prevent the uneven thickness caused by excessive deformation of the thin cup wall in one go, or even damage. Finally, after the large conical surface is formed, the strength of the cup wall can be effectively enhanced. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of the aluminum cup semi-finished product formed after step S2;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the semi-finished aluminum cup formed after step S3;

[0026] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the semi-finished aluminum cup formed after step S4;

[0028] Figure 5This is a schematic diagram of the cross-sectional structure of the aluminum cup semi-finished product formed after step S5;

[0029] Figure 6 A schematic diagram of the cross-sectional structure of an aluminum cup with a flange edge shaped into rounded corners;

[0030] Figure 7 for Figure 6 A magnified view of a section at point C;

[0031] Figure 8 A schematic diagram of the cross-sectional structure of an aluminum cup with an irregularly rounded flange edge;

[0032] Figure 9 This is a schematic diagram of the cross-sectional structure of an embodiment where the bottom of the pit is a flat plane.

[0033] Labeling Explanation: 1-Semi-finished aluminum cup, 2-Cup wall, 3-Cup mouth, 4-Flange edge, 5-First stage, 7-Straight wall step, 8-Conical wall step, 9-Large conical surface, 10-Second stage, 11-Pit, 12-Rounded corner, 13-Straight wall section, 14-Convex inflection point, 15-Finished aluminum cup. Detailed Implementation

[0034] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] This invention provides a method for forming a conical aluminum cup, wherein the aluminum cup formed in each step is as follows: Figure 1-9 As shown, the method includes the following steps:

[0036] S1. A cylindrical aluminum cup semi-finished product 1 is formed by extruding and then shearing aluminum material. The wall thickness of the aluminum cup semi-finished product 1 is 0.18mm. Preferably, the volume of the aluminum cup semi-finished product 1 is 15% to 20% larger than that of the finished aluminum cup, so as to ensure that the aluminum cup semi-finished product 1 has sufficient material to form the finished aluminum cup.

[0037] S2. The aluminum cup semi-finished product 1 is stretched multiple times, increasing its height and decreasing its diameter. During this process, the thickness of the cup wall 2 remains constant. The key point is to combine... Figure 1 As shown;

[0038] S3. The aluminum cup semi-finished product 1 is stretched again to reduce the thickness of the cup wall 2. During this process, the height of the aluminum cup semi-finished product 1 gradually increases, the diameter gradually decreases, and the cup wall thickness decreases. Specifically, in this embodiment, the cup wall thickness is reduced to 0.15mm. The thinner cup wall can reduce the production cost of the aluminum cup. In this step, the cup opening 3 at the top of the aluminum cup semi-finished product 1 is also made to form an outwardly flared flange 4 to enhance the strength of the cup opening 3, focusing on... Figure 2 , Figure 3 As shown;

[0039] S4. Stretch the aluminum cup semi-finished product 1 again, so that the upper part of the cup wall 2 of the aluminum cup semi-finished product 1 forms the first stage 5. The first stage 5 has at least one level of straight wall step 7 (the straight wall step is a step with equal diameter at all points, and the conical wall step is a step with diameter varying with height). (Focus on...) Figure 4 As shown;

[0040] S5. Stretch the aluminum cup semi-finished product 1 again, so that the portion of the cup wall 2 below the first stage 5 forms a multi-level conical wall step 8, with each multi-level conical wall step 8 gradually tapering inwards. The cup wall 2 forms a straight wall section 13 on the upper and / or lower side of each of the conical wall steps 8. The intersection of the top edge of each conical wall step 8 and its adjacent straight wall section 13 forms a convex inflection point 14. Each convex inflection point 14 is located on the large conical surface 9 formed in step S6. (Focus on...) Figure 5 As shown;

[0041] S6. Unfold the multi-level conical wall steps 8 into a single-level large conical surface 9, focusing on... Figure 6 As shown;

[0042] S7. The aluminum cup semi-finished product 1 is shaped using a contour mold. The straight-walled step 7 in the first stage 5 is shaped into a downwardly tapered conical step 8. A second stage 10 is shaped below the large conical surface 9. The second stage 10 includes at least one downwardly tapered conical step 8. A recess 11 is pressed upwards from the bottom of the aluminum cup semi-finished product 1, focusing on... Figure 6 , Figure 8 , Figure 9 As shown, the bottom of the recess 11 is either curved or flat to reduce the area of ​​the cup bottom and prevent instability caused by unevenness of the cup bottom; thus ultimately forming the finished aluminum cup 15, with a focus on... Figure 6 As shown.

[0043] Key points combined Figure 7 As shown, preferably in step 7, the flange edge 4 is rolled into a rounded corner 12. The diameter of the rounded corner 12 is not limited, but is preferably 1mm, to avoid exposing the cutting edge of the product. (Focus on...) Figure 6 , Figure 7 As shown, the finished aluminum cup (15mm) can also be left unrolled; the key point is to combine... Figure 8 As shown.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A method for forming a conical aluminum cup, characterized in that, The method includes the following steps: S1. Form the aluminum material into a cylindrical aluminum cup semi-finished product (1). S2. The aluminum cup semi-finished product (1) is stretched multiple times to increase its height and decrease its diameter; S3. Stretch the aluminum cup semi-finished product (1) again to reduce the thickness of the cup wall (2) of the aluminum cup semi-finished product (1) and make the cup mouth (3) at the top of the aluminum cup semi-finished product (1) form an outwardly flared flange (4). S4. Stretch the aluminum cup semi-finished product (1) again so that the cup wall (2) on the upper part of the aluminum cup semi-finished product (1) forms the first stage (5), and at least one straight wall step (7) is formed in the first stage (5). S5. Stretch the aluminum cup semi-finished product (1) again so that the cup wall (2) below the first stage (5) forms a multi-level conical wall step (8), and the multi-level conical wall step (8) gradually tapers downwards and inwards. S6. Unfold the multi-level conical wall steps (8) into a single-level large conical surface (9); In step S5, the cup wall (2) forms a straight wall section (13) on the upper and / or lower sides of each of the conical wall steps (8). The intersection of the top edge of each conical wall step (8) and the adjacent straight wall section (13) is a convex inflection point (14). Each convex inflection point (14) is located on the large conical surface (9) formed in step S6 to prevent uneven thickness and damage caused by excessive deformation of the thinner cup wall in a single operation.

2. The method for forming a conical aluminum cup as described in claim 1, characterized in that: After step S6, the aluminum cup semi-finished product (1) is shaped using a molding die.

3. The method for forming a conical aluminum cup as described in claim 2, characterized in that: After step S6, a second stage (10) is shaped below the large conical surface (9), the second stage (10) including at least one downwardly tapering conical wall step (8).

4. The method for forming a conical aluminum cup as described in claim 2, characterized in that: After step S6, the straight wall step (7) in the first stage (5) is shaped into a downwardly tapered conical wall step (8).

5. The method for forming a conical aluminum cup as described in claim 1, characterized in that: After step S6, a recess (11) is pressed out from the bottom side of the aluminum cup semi-finished product (1) upwards.

6. The method for forming a conical aluminum cup as described in claim 5, characterized in that: The bottom of the pit (11) is an arc surface or a plane.

7. The method for forming a conical aluminum cup as described in claim 1, characterized in that: After step S6, the flange edge (4) is rolled into a rounded corner (12).

8. The method for forming a conical aluminum cup as described in claim 1, characterized in that: In step S1, the aluminum cup semi-finished product (1) is formed by extruding and then shearing the aluminum material.

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