Metal ornament high-pressure bulging die

Abstract

The utility model discloses a kind of metal ornament high-pressure bulging mould and the bulging equipment applied thereto, including first template, second template and bulging insert block;At least two bulging insert blocks are butt jointed and spliced to form bulging cavity compatible with metal string bead pipe blank contour along radial direction;First template, second template are tightly sleeved in the end of bulging insert block along the both ends of bulging insert block axial and fixed;First template is provided with liquid inlet, and high-pressure bulging liquid is introduced into metal string bead pipe blank inside and exhausts, after exhaust is completed, metal string bead pipe blank is shaped under pressure according to predetermined shape and completes bulging;Sealing structure is preset in both ends of metal string bead pipe blank in the application, improve sealing effect, match vertical design bulging mould, inject bulging water to metal string bead pipe blank upwards, effectively improve exhaust effect, increase bulging effect, avoid bubble or gas stagnate in mould, ensure the smooth progress of bulging process and high quality of final product.

Description

Technical Field

[0001] This utility model relates to the technical field of metal jewelry processing equipment, and in particular to a high-pressure bulging mold for metal jewelry. Background Technology

[0002] Currently, metal jewelry such as hollow beads and hollow decorative rings commonly found in necklaces and bracelets are mostly made from tubular materials through mechanical forming. Existing forming methods mainly include stamping, spinning, deep drawing, and internal pressure bulging. Among these, stamping or spinning is suitable for thin-walled or single-curved surface structures, but it is difficult to obtain symmetrical three-dimensional shapes and is prone to surface cracking or wrinkling. Although deep drawing can obtain a certain three-dimensional shape, it requires high metal ductility, has limited forming depth, and is not suitable for symmetrical, closed hollow jewelry.

[0003] Therefore, some manufacturers also use internal pressure bulging technology to form hollow beads. However, the existing technology still has the following shortcomings in actual production: 1. Poor sealing performance: Since the blanks for jewelry are usually thin-walled tube blanks or sleeve blanks with small diameters (usually 3mm to 10mm) and limited end sealing area, the existing flat or plug-type sealing structures are prone to leakage under water pressure, which makes it impossible to establish stable expansion pressure; at the same time, the two ends of the tube blank are prone to axial slippage, which reduces the forming accuracy.

[0004] 2. The secondary bulging process is cumbersome: To ensure forming accuracy, existing equipment often requires multiple pressure forming processes. Although this can control the risk of breakage to some extent, the process is complex, the production cycle is slow, and the forming consistency is poor, which is not conducive to the efficient and stable production of small metal ornaments.

[0005] 3. The mold structure is rigid and the assembly is complex: Existing metal jewelry forming molds are typically made from a single piece of steel, resulting in a one-piece structure. For the production of various jewelry items in small batches, replacing the entire mold significantly increases downtime and spare mold costs. Furthermore, if dimensional deviations occur after the mold is manufactured, individual parts cannot be corrected or replaced; once worn or deformed, the entire mold must be replaced, leading to high maintenance costs.

[0006] Therefore, further research and development is needed to solve the problems existing in the above-mentioned technologies. Utility Model Content

[0007] Therefore, in order to solve the problems existing in the prior art, the purpose of this utility model is to provide a high-pressure bulging mold for metal ornaments.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A high-pressure bulging mold for metal jewelry is used to process and form hollow metal bead tube blanks. The metal bead tube blank includes multiple hollow spherical structures and hollow connecting columns disposed between adjacent hollow spherical structures. The bulging mold includes a first template, a second template, and bulging inserts located between the first template and the second template. At least two bulging inserts are joined together radially to form a bulging cavity adapted to the contour of the metal bead tube blank. The first template and the second template are tightly fitted and fixed at the ends of the bulging inserts along the axial direction. The first template has a liquid inlet corresponding to the end through hole of the metal beaded tube blank, which is used to introduce high-pressure expanding liquid into the metal beaded tube blank and force the air inside the metal beaded tube blank to be discharged away from the liquid inlet. After the air is discharged, the inner sides of the first template and the second template are in close contact with the expanding insert. Under the pressure of the high-pressure expanding liquid, the metal beaded tube blank is expanded and shaped in the expanding cavity according to the predetermined shape.

[0009] Furthermore, the hollow connecting columns at both ends of the metal bead tube blank are respectively provided with sealing structures, and the diameter or width of the sealing structure gradually increases in the direction away from the hollow connecting column to form a hemispherical or trumpet-shaped structure; the inner surfaces of the first template and the second template are respectively provided with a first sealing protrusion and a second sealing protrusion that abut against and are adapted to the sealing structure; the first sealing protrusion is provided with a through hole communicating with the liquid inlet.

[0010] The outer wall surface of the bulging insert is an arc-shaped surface. The bulging inserts are joined together in the radial direction to form a columnar structure or a frustum-shaped structure with a circular end face. The central region of the columnar structure or frustum-shaped structure forms the bulging cavity.

[0011] Furthermore, a limiting post is provided between the first template and the second template, and the limiting post has a limiting cavity inside that is adapted to the columnar structure formed by the expansion insert. The expansion insert is located in the limiting cavity and fixed.

[0012] The first template and the second template are distributed from bottom to top. The bulging insert is joined together in the radial direction to form a frustum-shaped structure that gradually decreases in size from end to end and is fixed in the limiting cavity. The first template and the second template press the limiting post and the bulging insert from the upper and lower ends of the limiting post, respectively.

[0013] Furthermore, the inner sides of the first template and the second template are respectively provided with a first mounting groove and a second mounting groove for installing the limiting post; the center of the first mounting groove and the second mounting groove are respectively provided with a first sealing protrusion and a second sealing protrusion.

[0014] Furthermore, the axial length of the bulging insert is less than the axial length of the limiting post, and the first mounting groove is provided with a mounting boss that abuts against the bulging insert, which extends into the limiting cavity and abuts against the end of the bulging insert; the sealing protrusion is located at the center of the mounting boss.

[0015] Specifically, the number of the bulging inserts is three or four, and the end face shape of each bulging insert is an annular fan shape.

[0016] Compared with the prior art, the beneficial effects of this utility model are at least in the following aspects: 1. This utility model improves the sealing effect by pre-setting hemispherical or trumpet-shaped sealing structures at both ends of the metal bead tube blank. This reduces water pressure instability and air ingress caused by poor sealing during water injection. As a result, during the high-pressure expansion process, the high-pressure liquid can fill the inner cavity of the metal bead tube blank more quickly, effectively, and evenly, and the metal bead tube blank can expand evenly. This ensures that pressure can be applied evenly and fully to the metal bead tube blank during the first high-pressure expansion process, allowing the metal material to extend more fully during the expansion process, resulting in a better fit to the cavity and effectively avoiding the need for secondary expansion.

[0017] At the same time, achieving one-time bulging also helps to reduce defects such as metal stress changes, excessive hardening and cracking caused by multiple bulging in traditional processes, reducing the risk of metal cracking, effectively improving the forming quality and processing efficiency of metal ornaments, and saving production time and costs.

[0018] Furthermore, the combination of the sealing protrusions and the metal beaded tube blank sealing structure enhances the stability of the mold. During high-pressure bulging, the sealing structure and sealing protrusions work together to effectively prevent product breakage caused by liquid leakage, as well as mold deformation or damage. This allows the mold to maintain a stable sealing effect during repeated use, improving its durability and long-term reliability.

[0019] 2. In this utility model, the vertical design of the first and second templates, along with the bulging insert and limiting post positioned between them, effectively improves the accuracy and space utilization efficiency of high-pressure bulging. Furthermore, the bulging insert's diameter gradually decreases from top to bottom, the limiting post's cavities have a consistent contour, and bulging water is injected upwards towards the metal bead tube blank, venting upwards to effectively improve venting and prevent air bubbles or gas from accumulating in the mold, ensuring a smooth bulging process and high-quality final product.

[0020] 3. The bulging mold of this utility model adopts a combination design of limiting post and bulging insert to ensure the stability of the bulging insert and form a tight contact with the template, thereby improving the stability and pressure resistance of the mold. Through reasonable layout, the first template, the second template, the bulging insert and the limiting post are tightly integrated, making the entire bulging mold structure more compact.

[0021] 4. The high-pressure bulging equipment of this utility model adopts a top-down structural design of pressure booster cylinder and water cylinder, which optimizes space utilization and makes the equipment more compact and stable. In addition, the upright support design between the pressure booster cylinder and the water cylinder enhances the load-bearing capacity of the overall structure, ensuring stability and reliability under high pressure conditions. The pressure booster piston rod is driven by the water cylinder piston rod, which can accurately and efficiently inject water into the bulging mold to achieve a uniform high-pressure bulging process. This not only improves the pressure transmission efficiency of the equipment, but also improves the overall utilization rate of the production line. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a high-pressure bulging mold for metal jewelry, a preferred embodiment of this utility model. Figure 2 This is a cross-sectional view of the overall structure of the high-pressure bulging mold for metal jewelry, a preferred embodiment of this utility model. Figure 3 This is an exploded view of the overall structure of the high-pressure bulging mold for metal jewelry, a preferred embodiment of this utility model. Figure 4 This is another exploded schematic diagram of the overall structure of the high-pressure bulging mold for metal jewelry, a preferred embodiment of this utility model; Figure 5 This is another exploded schematic diagram of the overall structure of the high-pressure bulging mold for metal jewelry, a preferred embodiment of this utility model; Figure 6 This is a schematic diagram of the assembly state of the bulging insert and the metal bead tube blank of the high-pressure bulging mold for metal jewelry, which is a preferred embodiment of this utility model.

[0023] In the picture: 1. First template; 11. Liquid inlet; 12. First sealing protrusion; 13. First mounting groove; 14. Mounting boss; 2. Second template; 21. Second sealing protrusion; 22. Second mounting groove; 3. Expanded insert; 31. Expanded cavity; 4. Limiting post; 41. Limiting cavity; 100. Metal bead tube blank; 101. Spherical structure; 102. Connecting column; 103. Sealing structure. Detailed Implementation

[0024] To facilitate understanding of this utility model, the technical solution and advantages of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific structure and features of this utility model are illustrated by way of example and should not constitute any limitation on this utility model. Furthermore, any of the technical features mentioned below (including implicit or disclosed features), as well as any technical features directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form other embodiments that may not be directly or indirectly mentioned in this utility model. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0025] In the description of this utility model, unless otherwise stated, all components used are conventional components in the prior art.

[0026] like Figure 1-6 As shown, this utility model provides a high-pressure bulging mold for metal jewelry, used for processing and forming a hollow metal bead tube blank 100. The metal bead tube blank 100 includes a plurality of hollow spherical structures 101 and hollow connecting columns 102 disposed between adjacent hollow spherical structures 101. The bulging mold includes a first template 1, a second template 2, and bulging inserts 3 located between the first template 1 and the second template 2. At least two bulging inserts 3 are joined together radially to form a bulging cavity 31 that matches the contour of the metal bead tube blank 100. The first template 1 and the second template 2 are tightly fitted onto the ends of the bulging inserts 3 along the axial direction and fixed. In this embodiment, by designing a cavity and bulging insert splicing structure that adapts to the metal bead tube blank, this embodiment ensures the uniform expansion of the metal bead tube blank during the bulging process, enhances the stability and adaptability of the mold, and ensures consistent bulging effect.

[0027] In this embodiment, each of the bulging inserts has a recess or cavity on its opposite side that matches the outline of the metal bead tube blank and has a pattern, which is used to form a fine texture on the metal bead tube blank during the bulging process; forming a precise texture effect on the surface of the metal jewelry, enhancing the beauty and artistry of the jewelry.

[0028] Generally, the metal bead blank can be made of pure gold, pure silver, or other malleable metal materials used in jewelry. In this embodiment, the initial form of the metal bead blank is a tubular structure composed of multiple hollow spherical structures and hollow connecting pillars, with a smooth surface and no patterns. During the bulging process, high-pressure water is injected into the blank through the inlet, causing the blank to expand under pressure within the cavity defined by the bulging inserts and adhere tightly to the patterned inner wall of the bulging cavity, thus completing the shape expansion and the formation of the surface pattern.

[0029] The first template 1 has a through-hole 11 corresponding to the end through-hole of the metal beaded tube blank 100. This inlet 11 is used to introduce high-pressure expanding liquid into the metal beaded tube blank 100 and force the air inside the metal beaded tube blank 100 to escape away from the inlet 11. After venting, the inner sides of the first template 1 and the second template 2 are in close contact with the expanding insert 3. Under the pressure of the high-pressure expanding liquid, the metal beaded tube blank 100 completes its expanding and shaping process according to a predetermined shape within the expanding cavity 31. In this embodiment, this design optimizes the liquid injection and gas discharge process during expanding, ensuring that the inner cavity of the metal beaded tube blank is uniformly filled with expanding liquid, avoiding the generation of bubbles or trapped gas, thereby improving the uniformity of expanding and the processing quality of the metal material.

[0030] To improve the sealing effect during the expansion process, the ends of the hollow connecting columns 102 at both ends of the metal bead tube blank 100 are respectively provided with sealing structures 103, and the diameter or width of the sealing structure 103 gradually increases in the direction away from the hollow connecting column 102; the inner surfaces of the first template 1 and the second template 2 are respectively provided with a first sealing protrusion 12 and a second sealing protrusion 21 that abut against and match the sealing structure 103; the first sealing protrusion 12 is provided with a through hole communicating with the liquid inlet 11.

[0031] More specifically, the sealing structure 103 is a hemispherical or trumpet-shaped structure. In this embodiment, by providing hemispherical or trumpet-shaped sealing structures at both ends of the metal bead tube blank, the contact area of ​​the sealing region can be significantly increased, improving the sealing effect. This reduces the problem of uneven high-pressure water flow or leakage caused by poor sealing during water injection, allowing the expanding liquid to more effectively and evenly fill the inner cavity of the metal bead tube blank during the high-pressure expansion process, and promoting the uniform expansion of the metal bead tube blank. This ensures that pressure can be applied evenly and sufficiently during the first high-pressure expansion process, avoiding the need for secondary expansion.

[0032] At the same time, achieving one-time bulging also helps to reduce defects such as metal stress changes, excessive hardening and cracking caused by multiple bulging in traditional processes, reducing the risk of metal cracking, effectively improving the forming quality and processing efficiency of metal ornaments, and saving production time and costs.

[0033] To be further detailed, the outer wall surface of the bulging insert 3 is an arc-shaped surface, and the bulging insert 3 is joined together in the radial direction to form a columnar structure or a frustum-shaped structure with a circular end face. The central region of the columnar structure or frustum-shaped structure forms the bulging cavity 31.

[0034] In some optional embodiments, a limiting post 4 is provided between the first template 1 and the second template 2. The limiting post 4 has a limiting cavity 41 inside that matches the columnar structure formed by the bulging insert 3. The bulging insert 3 is located in and fixed within the limiting cavity 41. In this embodiment, the combination design of the limiting post and the bulging insert further enhances the precision and stability of the mold. The function of the limiting post is to prevent the bulging insert from shifting or deforming during high-pressure bulging, thereby improving the working efficiency of the mold and the consistency of the product.

[0035] Further refining the design, the first template 1 and the second template 2 are distributed from bottom to top. The bulging insert 3 is joined together radially to form a frustum-shaped structure that gradually decreases in diameter at the ends, and is fixed in the limiting cavity 41. The first template 1 and the second template 2 press the limiting post 4 and the bulging insert 3 from the upper and lower ends of the limiting post 4, respectively. In this embodiment, the vertical design of the first and second templates, as well as the bulging insert and limiting post located between the first and second templates, effectively improves the accuracy and space utilization efficiency of high-pressure bulging. Furthermore, the bulging insert gradually decreases in diameter from top to bottom, and the contour of the limiting cavity of the limiting post is consistent with this feature. The mold injects bulging water upwards towards the metal bead tube blank and vents air upwards, effectively improving the venting effect and preventing air bubbles or gas from remaining in the mold, ensuring the smooth progress of the bulging process and the high quality of the final product.

[0036] Specifically, the number of the bulging inserts 3 is three or four, and the end face shape of each bulging insert 3 is an annular fan shape. While making full use of the mold space, it can also effectively disperse the pressure during the bulging process, thereby avoiding excessive pressure concentrated in a single part, which could lead to mold damage or product deformation.

[0037] In some optional embodiments, the inner sides of the first template 1 and the second template 2 are respectively recessed with a first mounting groove 13 and a second mounting groove 22 for mounting the limiting post 4; the center of the first mounting groove 13 and the second mounting groove 22 are respectively provided with a first sealing protrusion 12 and a second sealing protrusion 21. In this embodiment, the function of the sealing protrusion is to closely contact and abut against the hemispherical or trumpet-shaped sealing structures at both ends of the metal bead tube blank, thereby enhancing the sealing effect and ensuring the expansion effect.

[0038] Furthermore, the combination of the sealing protrusions and the metal beaded tube blank sealing structure enhances the stability of the mold. During the high-pressure bulging process, the sealing structure and sealing protrusions work together to effectively prevent mold deformation or damage caused by liquid leakage, enabling the mold to maintain a stable sealing effect during repeated use and improving its durability and long-term reliability.

[0039] In some optional embodiments, the axial length of the bulging insert is less than the axial length of the limiting post. The first mounting groove 13 has a mounting boss 14 that abuts against the bulging insert 3, extending into the limiting cavity 41 and abutting against the end of the bulging insert 3. The sealing protrusion is located at the center of the mounting boss 14. In this embodiment, by setting the axial length of the bulging insert to be less than the axial length of the limiting post, and by placing the mounting boss in the first mounting groove to abut against the end of the bulging insert, accurate positioning of the bulging insert in the mold can be ensured. The design of the mounting boss effectively avoids any axial offset or displacement of the bulging insert, ensuring stability during the bulging process, thereby improving the forming accuracy of the metal bead tube blank.

[0040] This utility model is applied to a high-pressure bulging equipment for metal jewelry. Referring to the structure and layout disclosed in CN220319966U published by the applicant on July 28, 2023, the bulging equipment is not the focus of this utility model's improvement, and therefore will not be described in detail here. In use, the operator first places the metal beaded tube blank into the bulging cavity of the bulging mold. Water is then supplied to the inner cavity of the metal beaded tube blank through the high-pressure water supply device of the bulging equipment via the inlet of the first template, allowing air inside the tube blank to escape upwards. After venting is complete, the first and second templates are closed, ensuring that the sealing structure of the metal beaded tube blank is in close contact with the sealing protrusions inside the mold. The pressure structure of the bulging equipment is then activated, gradually increasing the pressure of the water used for bulging to a suitable range, and injecting it into the cavity of the bulging mold along the pipeline. The high-pressure water enters the interior of the metal beaded tube blank through the inlet, causing the tube blank to expand uniformly and completely fill the bulging cavity until the predetermined shape is achieved.

[0041] It should be noted that this utility model also includes commonly used components required for bulging, enabling stable, efficient, and safe operation of high-pressure bulging. These are not the focus of this utility model's improvement and will not be elaborated upon here. Those skilled in the art can implement this utility model based on its working principle, as long as it achieves the beneficial effects of this utility model.

[0042] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A high-pressure bulging mold for metal jewelry, used for processing and forming hollow metal bead tube blanks; characterized in that, The metal beaded tube blank includes multiple hollow spherical structures and hollow connecting columns disposed between adjacent hollow spherical structures; the bulging mold includes a first template, a second template, and bulging inserts located between the first template and the second template; at least two bulging inserts are joined together radially to form a bulging cavity adapted to the contour of the metal beaded tube blank; the first template and the second template are tightly fitted and fixed at both ends of the bulging insert along the axial direction of the bulging insert. The first template has a liquid inlet corresponding to the end through hole of the metal beaded tube blank, which is used to introduce high-pressure expanding liquid into the metal beaded tube blank and force the air inside the metal beaded tube blank to be discharged away from the liquid inlet. After the air is discharged, the inner sides of the first template and the second template are in close contact with the expanding insert. Under the pressure of the high-pressure expanding liquid, the metal beaded tube blank is expanded and shaped in the expanding cavity according to the predetermined shape.

2. The high-pressure bulging mold for metal jewelry as described in claim 1, characterized in that, The hollow connecting columns at both ends of the metal bead tube blank are respectively provided with sealing structures, and the diameter or width of the sealing structure gradually increases in the direction away from the hollow connecting column; the inner sides of the first template and the second template are respectively provided with a first sealing protrusion and a second sealing protrusion that abut against and match the sealing structure; the first sealing protrusion is provided with a through hole communicating with the liquid inlet.

3. The high-pressure bulging mold for metal jewelry as described in claim 2, characterized in that, The sealing structure is hemispherical or trumpet-shaped.

4. The high-pressure bulging mold for metal jewelry as described in claim 2 or 3, characterized in that, The outer wall surface of the bulging insert is an arc-shaped surface. The bulging inserts are joined together in the radial direction to form a columnar structure or a frustum-shaped structure with a circular end face. The central region of the columnar structure or frustum-shaped structure forms the bulging cavity.

5. The high-pressure bulging mold for metal jewelry as described in claim 4, characterized in that, A limiting post is provided between the first template and the second template. The limiting post has a limiting cavity inside that is adapted to the columnar structure formed by the expansion insert. The expansion insert is located in the limiting cavity and fixed.

6. The high-pressure bulging mold for metal jewelry as described in claim 5, characterized in that, The first template and the second template are distributed from bottom to top. The bulging insert is joined together in the radial direction to form a frustum-shaped structure that gradually decreases in size from end to end and is fixed in the limiting cavity. The first template and the second template press the limiting post and the bulging insert from the upper and lower ends of the limiting post, respectively.

7. The high-pressure bulging mold for metal jewelry as described in claim 5, characterized in that, The first template and the second template are respectively recessed on their inner sides to provide a first mounting groove and a second mounting groove for installing the limiting post; the first mounting groove and the second mounting groove are respectively provided with a first sealing protrusion and a second sealing protrusion at their center.

8. The high-pressure bulging mold for metal jewelry as described in claim 7, characterized in that, The axial length of the bulging insert is less than the axial length of the limiting post. The first mounting groove is provided with a mounting boss that abuts against the bulging insert. The mounting boss extends into the limiting cavity and abuts against the end of the bulging insert. The sealing protrusion is located at the center of the mounting boss.

9. The high-pressure bulging mold for metal jewelry as described in claim 8, characterized in that, The number of the bulging inserts is three or four, and the end face shape of each bulging insert is an annular fan shape.

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