Lead block packaging structure and manufacturing method thereof

Abstract

The application discloses a lead block packaging structure and a manufacturing method thereof, and belongs to the technical field of metal packaging. The packaging structure comprises a rectangular box body formed by punching and molding of a whole low-carbon steel plate, the box body comprises an integral bottom plate and four side walls, and the four side walls are integrally connected with foldable cover plate wings at the top; after the lead block is loaded, the four cover plate wings are folded inward to form a flat joint, and the joint is invisible after polishing. The manufacturing method comprises blanking, punching and molding, loading the lead block, folding the cover plate, welding and sealing, and polishing. All the edge beads of the application are integrally punched and molded, and there is no welding joint, so that the risk of cracking of the edge bead welding joint is fundamentally eliminated, and the tearing resistance and structural stability are significantly improved; the welding joint is arranged on the top plane, the sealing is reliable, and the appearance is smooth after polishing; the one-time punching and molding process is adopted, the production efficiency is high, and the application is suitable for batch production.

Description

Technical Field

[0001] This invention belongs to the field of metal packaging technology, specifically a lead block packaging structure and its manufacturing method. Background Technology

[0002] Lead blocks are widely used as important counterweight and radiation shielding materials in fields such as mechanical counterweights, medical radiation protection, and nuclear industry shielding. To prevent oxidation and contamination of the lead blocks and to improve structural strength, they are usually encapsulated.

[0003] Currently, lead block encapsulation boxes are mostly manufactured by splicing and welding multiple plates. This involves cutting multiple steel plates separately, welding them together at the edges to form the box body, placing the lead block inside, and then welding a cover plate. This encapsulation structure has the following technical drawbacks: First, the sealing weld is usually located at the edge of the box, which is the area where the stress is most concentrated. When subjected to collision or external impact, stress concentration is easily generated at the weld joint, leading to weld cracking and sealing failure. Second, the structure of splicing multiple plates results in poor overall integrity of the box and low tear resistance. When subjected to torsional or tensile forces, relative displacement can easily occur between the spliced ​​surfaces. Third, the presence of multiple welds increases the risk of sealing failure. Defects in any weld can lead to a decrease in sealing performance. Finally, the process of splicing and welding multiple plates is complex, has low production efficiency, and makes it difficult to guarantee the appearance quality after welding. Welds at the edge significantly affect the product's aesthetics.

[0004] Therefore, there is an urgent need to develop a new type of lead block packaging structure that can fundamentally solve the technical problems of existing packaging boxes, such as easy cracking of the edge welding, poor integrity, low tear resistance, and insufficient sealing. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a lead block encapsulation structure and its manufacturing method, solving the technical problems of easy cracking of the welding of the edge of the encapsulation box, poor structural integrity, low tear resistance, and insufficient sealing. It realizes the integral molding of all edge of the encapsulation box, significantly improving structural stability and tear resistance, while ensuring good sealing effect and appearance quality.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a lead block encapsulation structure, comprising a rectangular box formed by stamping from a single sheet of material, the rectangular box comprising a bottom plate and side walls, wherein four side walls are provided, the four side walls being integrally stamped with the bottom plate, and the top of each of the four side walls being integrally connected with an inwardly foldable wing plate, the wing plate being folded inward after the lead block is inserted into the box, and the top sealing connection is achieved by welding, and the joint is ground after welding to make it invisible.

[0007] Furthermore, the wing plate is a cover wing plate. The four cover wing plates are folded inward by 180 degrees and cover the lead block to form a closed top surface. The edges of adjacent cover wing plates are joined to form a planar joint. The planar joint is sealed by welding.

[0008] Furthermore, the wing plate is a supporting wing plate. The four supporting wing plates are folded inward by 180 degrees to form an annular supporting platform. A rectangular cover plate is provided on the annular supporting platform. The four edges of the rectangular cover plate are joined with the outer edges of the four supporting wing plates to form an annular joint. The annular joint is sealed by welding.

[0009] Furthermore, the sheet material is one of low-carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content of ≤0.22%.

[0010] Furthermore, the four edge ribs between the four side walls and the bottom plate, as well as the four corner edge ribs between two adjacent side walls, are all integrally stamped continuous structures without welded seams.

[0011] Furthermore, the corners between the base plate and the four side walls, as well as the longitudinal corners between two adjacent side walls, are provided with stamped inner rounded corners. The radius of the inner rounded corner is less than or equal to 10 mm, and the ratio of the radius of the inner rounded corner to the thickness of the sheet material is greater than or equal to 1.5.

[0012] A method for manufacturing the above-mentioned lead block encapsulation structure includes the following steps: S1. Blanking: Select a metal sheet that meets the requirements, calculate the unfolded material size according to the final product size, and cut it into a flat blank that includes the bottom plate area, side wall area and wing plate area; S2, Stamping: The flat blank is placed into the stamping die and stamped in one step into an open rectangular box with four side walls and four outwardly flared wing plates. S3. Insert lead blocks: Place lead blocks of the same size as the inner cavity of the box into the uncovered box. S4. Wing plate folding: Fold the four wing plates 180 degrees inward into the box in sequence; S5. Top sealing welding: Weld the folded top structure to achieve a sealed connection; S6. Grinding and smoothing: Grind and polish the welding area to make the surface flush with the original surface of the base material and with the same smoothness.

[0013] As the first preferred process route, in step S4, the four wing plates are folded to form a closed top surface covering the lead block, and the edges of adjacent wing plates are joined to form a planar joint; in step S5, the planar joint is continuously welded.

[0014] As a second preferred process route, in step S4, the four wing plates are folded into an annular support platform; in step S5, a rectangular cover plate is placed on the annular support platform, and the annular joint between the four edges of the rectangular cover plate and the outer edges of the four support wing plates is continuously welded.

[0015] Further, in step S1, the metal plate is one of low-carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content of ≤0.22%; in step S5, the welding adopts pulsed fiber laser welding or tungsten inert gas welding, and the welding process is protected by argon gas; in step S6, the grinding adopts three processes in sequence: rough grinding, fine grinding and polishing, until the weld is not visible to the naked eye.

[0016] (III) Beneficial Effects This invention provides a device. It has the following beneficial effects: 1. Extremely high tear resistance and structural stability: All longitudinal and bottom edge ribs are formed from a single piece of metal through plastic deformation, without any welding or connection marks. This fundamentally eliminates stress concentration points and structural weak areas at the edge ribs of traditional packaging boxes. Even under severe impact or compression, the box will not crack along the edge ribs, and its overall strength far exceeds that of welded structures.

[0017] 2. Excellent sealing performance: The only sealing weld is located at the butt joint on the top surface, rather than on the stress-concentrated edge. This layout makes the weld less susceptible to direct external impact, greatly reducing the risk of seal failure due to collision. Combined with a continuous fusion welding process, reliable sealing can be achieved.

[0018] 3. Aesthetically pleasing and safe: All welds are completely concealed after grinding, resulting in a seamless appearance of the packaging box without any protruding weld beads or seams. This enhances the product's quality and avoids safety hazards such as snagging or scratches caused by protruding welds. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the lead block packaging structure after stamping according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the folding process of the lead block packaging structure according to the first embodiment of the present invention; Figure 3This is a schematic diagram of the lead block packaging structure after folding according to the first embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the lead block encapsulation structure after stamping according to the second embodiment of the present invention; Figure 5 This is a schematic diagram of the overall three-dimensional structure after welding according to the second embodiment of the present invention.

[0020] In the diagram: 1-Rectangular box; 101-Base plate; 102-Side wall; 103-Wing plate; 104-Flat joint; 105-Rectangular cover plate; 106-Annular joint. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-3 The present invention provides a technical solution: a lead block encapsulation structure, comprising a rectangular box 1 formed by stamping a single sheet of material, wherein the sheet material is one of low-carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content of ≤0.22%.

[0023] The rectangular box 1 includes a base plate 101 and side walls 102. There are four side walls 102, which are integrally stamped with the base plate 101. The top of each of the four side walls 102 is integrally connected with an inwardly foldable wing plate 103.

[0024] Option 1: The wing plate 103 is a cover wing plate. The four cover wing plates are folded inward by 180 degrees and cover the lead block to form a closed top surface. The edges of adjacent cover wing plates are joined to form a planar joint 104. The gap width of the planar joint 104 is less than 1mm. The planar joint 104 is sealed by welding. The top is sealed by welding. After welding, the joint is ground to make it invisible.

[0025] Option 2: Wing plate 103 is a supporting wing plate. The four supporting wing plates are folded inward by 180 degrees to form an annular supporting platform. A rectangular cover plate 105 of the same material is set on the annular supporting platform. The four edges of the rectangular cover plate 105 are joined with the outer edges of the four supporting wing plates to form an annular joint 106. The annular joint 106 is sealed by welding.

[0026] In any of the designs, the four edge ribs between the four side walls 102 and the base plate 101, as well as the four corner edge ribs between two adjacent side walls 102, are all integrally stamped continuous structures without welded seams.

[0027] At the corners between the base plate 101 and the four side walls 102, and at the longitudinal corners between two adjacent side walls 102, stamped inner rounded corners are provided. The radius of the inner rounded corner is less than or equal to 10 mm, and the ratio of the radius of the inner rounded corner to the thickness of the sheet material is greater than or equal to 1.5.

[0028] A method for manufacturing the above-mentioned lead block encapsulation structure includes the following steps: S1. Blanking: Select a metal sheet that meets the requirements, calculate the unfolded material size according to the final product size, and cut it into a flat blank containing the bottom plate area, side wall area and wing plate area; the metal sheet is one of the following: low carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content ≤0.22%; S2, Stamping: The flat blank is placed into the stamping die and stamped in one step into an open rectangular box with four side walls and four outwardly flared wing plates. S3. Insert lead blocks: Place lead blocks of the same size as the inner cavity of the box into the uncovered box. S4. Wing plate folding: Fold the four wing plates 180 degrees inward into the box in sequence; S5. Top sealing welding: The folded top structure is welded using pulsed fiber laser welding or tungsten inert gas welding, with argon gas protection during the welding process to achieve a sealed connection. S6. Grinding and smoothing: First, use 240-grit sandpaper to coarsely grind away the excess height of the weld, then use 600-grit fine sandpaper to finely grind, and finally use a wool wheel to polish until the weld and the base material are completely consistent in color and texture, and the weld cannot be distinguished by visual inspection, thus obtaining the final packaged product.

[0029] If Option 1 is adopted, in step S4, the four wing plates are folded to cover the closed top surface above the lead block, and the edges of adjacent wing plates are joined to form a planar seam; in step S5, the planar seam is continuously welded.

[0030] If Scheme 2 is adopted, in step S4, the four wing plates are folded into an annular support platform; in step S5, a rectangular cover plate is placed on the annular support platform, and the annular joint between the four edges of the rectangular cover plate and the outer edges of the four support wing plates is continuously welded.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lead block packaging structure, characterized in that, The rectangular box (1) is formed by stamping from a single sheet of material. The rectangular box (1) includes a bottom plate (101) and side walls (102). There are four side walls (102). The four side walls (102) are integrally stamped with the bottom plate (101). The top of each of the four side walls (102) is integrally connected with an inwardly foldable wing plate (103). The wing plate (103) is folded inward after the lead block is inserted into the box. The top is sealed by welding. After welding, the seam is polished to make it invisible.

2. The lead block encapsulation structure according to claim 1, characterized in that: The wing plate is a cover wing plate. The four cover wing plates are folded inward by 180 degrees and cover the lead block to form a closed top surface. The edges of adjacent cover wing plates are joined to form a planar joint (104). The planar joint (104) is sealed by welding.

3. The lead block encapsulation structure according to claim 1, characterized in that: The wing plate is a support wing plate. The four support wing plates are folded inward by 180 degrees to form an annular support platform. A rectangular cover plate (105) is provided on the annular support platform. The four edges of the rectangular cover plate (105) are joined with the outer edges of the four support wing plates to form an annular joint (106). The annular joint (106) is sealed by welding.

4. The lead block encapsulation structure according to claim 1, characterized in that: The sheet material is one of low-carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content of ≤0.22%.

5. The lead block encapsulation structure according to claim 1, characterized in that: The four side ribs between the four side walls (102) and the base plate (101) and the four corner ribs between two adjacent side walls (102) are all integrally stamped continuous structures without welded seams.

6. The lead block encapsulation structure according to claim 1, characterized in that: The corners between the base plate (101) and the four side walls (102), as well as the longitudinal corners between two adjacent side walls (102), are provided with stamped inner rounded corners. The radius of the inner rounded corner is less than or equal to 10 mm, and the ratio of the radius of the inner rounded corner to the thickness of the plate is greater than or equal to 1.

5.

7. A method for manufacturing a lead block encapsulation structure based on any one of claims 1-6, characterized in that, Includes the following steps: S1. Blanking: Select a metal sheet that meets the requirements, calculate the unfolded material size according to the final product size, and cut it into a flat blank that includes the bottom plate area, side wall area and wing plate area; S2, Stamping: The flat blank is placed into the stamping die and stamped in one step into an open rectangular box with four side walls and four outwardly flared wing plates. S3. Insert lead blocks: Place lead blocks of the same size as the inner cavity of the box into the uncovered box. S4. Wing plate folding: Fold the four wing plates 180 degrees inward into the box in sequence; S5. Top sealing welding: Weld the folded top structure to achieve a sealed connection; S6. Grinding and smoothing: Grind and polish the welding area to make the surface flush with the original surface of the base material and with the same smoothness.

8. The manufacturing method according to claim 7, characterized in that: In step S4, the four wing plates are folded to cover the closed top surface above the lead block, and the edges of adjacent wing plates are joined to form a planar seam; in step S5, the planar seam is continuously welded.

9. The manufacturing method according to claim 7, characterized in that: In step S4, the four wing plates are folded into an annular support platform; in step S5, a rectangular cover plate is placed on the annular support platform, and the annular joint between the four edges of the rectangular cover plate and the outer edges of the four support wing plates is continuously welded.

10. The manufacturing method according to claim 7, characterized in that: In step S1, the metal plate is one of low-carbon steel plate, stainless steel plate or titanium alloy plate with a carbon content ≤0.22%; in step S5, the welding adopts pulsed fiber laser welding or tungsten inert gas welding, and the welding process is protected by argon gas; in step S6, the grinding adopts three processes in sequence: rough grinding, fine grinding and polishing, until the weld is not visible to the naked eye.

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