Forming mold for tube blank without cutting

Abstract

This utility model relates to the field of corrugated pipe manufacturing technology and discloses a forming mold for pipe blanks that eliminates the need for cutting. The forming mold includes a mold shell and a mold core. The inner wall of the mold shell forms a hydraulic channel, and the mold core is coaxially disposed within the hydraulic channel, with its outer circumference forming an annular installation gap between the core and the inner wall of the mold shell to accommodate the pipe blank. The mold core has a mold core channel and a sealing structure, which allows the hydraulic channel to be sealed and connected to the cavity of the pipe blank through the mold core channel. This utility model's forming mold for pipe blanks eliminates the need for cutting off the waste edges of the pipe blank before forming, thereby improving material utilization and reducing production costs by placing the mold core within the hydraulic channel.

Description

Technical Field

[0001] This utility model relates to the field of corrugated pipe production technology, specifically to a forming mold for pipe blanks that eliminates the need for cutting. Background Technology

[0002] A bellows is an elastic element with a corrugated structure. Its corrugated structure gives it good flexibility and elasticity, and it is widely used in machinery, electronics, chemical industry, aerospace and other fields.

[0003] Hydroforming is a common process for manufacturing bellows. This process involves applying high-pressure liquid inside a tube blank, causing it to expand under the constraint of a mold to form a corrugated shape. During hydroforming, the seal between the openings at both ends of the bellows and the forming mold is crucial. For example... Figure 1 As shown, due to the limitations of the tube blank production process, the two ends of the tube blank will have process waste edges with inconsistent outer diameter cylindricity. In the traditional corrugated pipe hydraulic manufacturing method, it is necessary to first remove the process waste edges at the ends of the tube blank so that the cylindricity of the removed tube blank end 91 is uniform and can be tightly fitted with the annular inner wall 9 of the hard seal forming mold 92, thereby achieving a seal between the two.

[0004] However, for tube blanks that require multiple forming processes, traditional methods necessitate the removal of process waste at the ends before each forming, leading to reduced material utilization and increased production costs. Therefore, it is necessary to develop a forming die that eliminates the need to remove process waste from the tube blank. Utility Model Content

[0005] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a tube blank forming mold that does not require cutting, so that the tube blank can form a seal with the tube blank forming mold without cutting off the process waste.

[0006] To achieve the above objectives, this utility model provides a tube blank forming mold that eliminates the need for cutting. The tube blank forming mold includes a mold shell and a mold core. The inner wall of the mold shell forms a hydraulic channel. The mold core is coaxially disposed within the hydraulic channel, and its outer circumferential surface forms an annular mounting gap with the inner wall of the mold shell to accommodate the tube blank. The mold core has a mold core channel and a sealing structure, which allows the hydraulic channel to be sealed and connected to the tube blank cavity through the mold core channel.

[0007] In some embodiments, the mold housing includes a core mounting section and a third mold section. The core mounting section includes a first mold section and a second mold section. The core is mounted on the core mounting section. The core includes an upper working end and a lower mounting section. An annular mounting gap is formed between the working section and the inner wall of the first mold section. The mounting section is detachably connected to the inner wall of the second mold section, and the sealing structure enables a sealed connection between the core channel and the hydraulic channel of the third mold section.

[0008] In some embodiments, the periphery of the mounting section has external threads that can be threadedly connected to the internal threads of the inner wall of the second mold section.

[0009] In some embodiments, the sealing structure includes a first sealing structure and a second sealing structure. The first sealing structure is located in the working section and enables a sealed connection between the tube blank cavity and the mold core channel. The second sealing structure is located in the installation section and enables a sealed connection between the mold core channel and the hydraulic channel of the third mold section.

[0010] In some embodiments, the first sealing structure includes an annular first sealing groove and a first sealing ring embedded in the first sealing groove. When the tube blank is installed in the annular installation gap, the first sealing ring can fit tightly against the inner wall of the tube blank.

[0011] In some embodiments, the number of first sealing structures is at least two.

[0012] In some embodiments, when the tube blank is installed in the annular mounting gap, the lowest position of the first sealing structure is higher than the highest position of the process waste edge in the axial direction of the mold core.

[0013] In some embodiments, the second sealing structure includes an annular second sealing groove and a second sealing ring embedded in the second sealing groove, and the second sealing structure can fit tightly against the inner wall of the mold housing.

[0014] In some embodiments, the top of the mold core has a circumferential chamfer.

[0015] In some embodiments, the cross-sectional shape of the first sealing ring is circular.

[0016] Applying one of the above-described technical solutions of this utility model has the following effects:

[0017] The mold core is installed in the hydraulic channel of the mold shell. When the tube blank is installed into the tube blank no-cut forming mold, the tube wall of the tube blank is accommodated in the annular installation gap between the outer circumferential surface of the mold core and the inner wall of the mold shell, and the mold core is sleeved in the tube cavity of the tube blank. The sealing structure of the mold core can seal the tube cavity of the tube blank and the mold core channel, and also seal the mold core channel of the mold core and the hydraulic channel. This allows hydraulic fluid to be transferred from the hydraulic channel to the tube blank through the mold core channel, so that the tube blank can form a corrugated shape under the constraint of the mold. The tube blank no-cut forming mold of this utility model, by setting the mold core in the hydraulic channel, achieves a sealed connection between the tube cavity of the tube blank and the hydraulic channel, avoiding the process of cutting off the waste edge of the tube blank before forming, improving material utilization and reducing production costs.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the use of a hard-seal molding die in the background art;

[0020] Figure 2 This is a schematic diagram of a tube blank forming mold without cutting according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a mold core according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Mold shell; 11. First mold section; 12. Second mold section; 13. Third mold section; 2. Mold core; 21. Mold core channel; 22. Working section; 23. Installation section; 3. Hydraulic channel; 4. Annular installation gap; 5. First sealing structure; 51. First sealing groove; 52. First sealing ring; 6. Second sealing structure; 7. Circumferential chamfer; 8. Tube blank; 81. Process waste edge; 9. Annular inner wall; 91. Tube blank end; 92. Hard seal forming mold. Detailed Implementation

[0024] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0025] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the orientation in the assembled and used state. "Inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself.

[0026] like Figure 2 As shown, this utility model provides a tube blank forming mold that eliminates the need for cutting. The tube blank forming mold includes a mold shell 1 and a mold core 2. The inner wall of the mold shell 1 forms a hydraulic channel 3. The mold core 2 is coaxially disposed in the hydraulic channel 3, and its outer circumferential surface forms an annular mounting gap 4 between it and the inner wall of the mold shell 1 to accommodate the tube wall of the tube blank 8. The mold core 2 has a mold core channel 21 and a sealing structure. The sealing structure enables the hydraulic channel 3 to be sealed and connected to the tube cavity of the tube blank 8 through the mold core channel 21.

[0027] Specifically, the mold core 2 is installed in the hydraulic channel 3 of the mold shell 1. When the tube blank 8 is installed into the tube blank no-cut forming mold, the tube wall of the tube blank 8 is accommodated in the annular installation gap 4 between the outer peripheral surface of the mold core 2 and the inner wall of the mold shell 1, and the mold core 2 is sleeved in the tube cavity of the tube blank 8. The sealing structure of the mold core 2 can seal and connect the tube cavity of the tube blank 8 with the mold core channel 21 of the mold core 2, and can also seal and connect the mold core channel 21 of the mold core 2 with the hydraulic channel 3. This allows hydraulic fluid to be transmitted from the hydraulic channel 3 through the mold core channel 21 to the tube blank 8, so that the tube blank 8 can form a corrugated shape under the constraint of the mold. The tube blank no-cut forming mold of this utility model, by setting the mold core 2 in the hydraulic channel 3, achieves a sealed connection between the tube cavity of the tube blank 8 and the hydraulic channel 3, avoiding the process waste edge 81 of the tube blank 8 before forming, improving material utilization and reducing production costs.

[0028] In some embodiments of this utility model, the mold shell 1 includes a mold core mounting section 23 and a third mold section 13. The mold core mounting section 23 includes a first mold section 11 and a second mold section 12. The mold core 2 is mounted on the mold core mounting section 23. The mold core 2 includes an upper working end and a lower mounting section 23. An annular mounting gap 4 is formed between the working section 22 and the inner wall of the first mold section 11. The mounting section 23 is detachably connected to the inner wall of the second mold section 12, and the sealing structure enables the mold core channel 21 to be sealed and connected to the hydraulic channel 3 of the third mold section 13.

[0029] Specifically, the tube blank 8 can be inserted into the annular installation gap 4 formed between the working section 22 and the first mold section 11. The tube cavity of the tube blank 8 is connected to the hydraulic channel 3 through the mold core channel 21 of the mold core 2. The sealing structure can achieve the sealing of the tube cavity, the mold core channel 21 and the hydraulic channel 3.

[0030] In some embodiments of this utility model, the periphery of the mounting section 23 has an external thread, which can be threadedly connected to the internal thread of the inner wall of the second mold section 12.

[0031] Specifically, the mounting section 23 of the mold core 2 is connected to the inner wall of the second mold section 12 by a thread, which satisfies both the simplicity and reliability of the connection.

[0032] like Figure 3 As shown, in some embodiments of this utility model, the sealing structure includes a first sealing structure 5 and a second sealing structure 6. The first sealing structure 5 is located in the working section 22 and can seal the connection between the tube cavity of the tube blank 8 and the mold core channel 21. The second sealing structure 6 is located in the installation section 23 and can seal the connection between the mold core channel 21 and the hydraulic channel 3 of the third mold section 13.

[0033] Specifically, the first sealing structure 5 enables the tube blank 8 to be sealed and connected with the mold core channel 21, and the second sealing structure 6 enables the mold core channel 21 to be sealed and connected with the hydraulic channel 3 of the third mold section 13, thereby enabling the sealing structure to achieve the sealing performance of the tube blank 8's tube cavity, mold core channel 21 and hydraulic channel 3.

[0034] In some embodiments of this utility model, the first sealing structure 5 includes an annular first sealing groove 51 and a first sealing ring 52 embedded in the first sealing groove 51. When the tube blank 8 is installed in the annular installation gap 4, the first sealing ring 52 can fit tightly against the inner wall of the tube blank 8.

[0035] Specifically, after the tube blank 8 is inserted into the annular mounting gap 4, the first sealing ring 52 seals the gap between the inner wall of the tube blank 8 and the outer periphery of the mold core 2, thereby achieving a sealed connection between the tube cavity of the tube blank 8 and the mold core channel 21. In some embodiments, the first sealing ring 52 is made of a flexible and elastic material to facilitate the insertion and removal of the tube blank 8.

[0036] In some embodiments of this utility model, the number of first sealing structures 5 is at least two.

[0037] Specifically, in order to enhance the reliability of the seal between the tube blank 8 cavity and the mold core channel 21, multiple first sealing structures 5 are provided.

[0038] In some embodiments of this utility model, in order to prevent the process waste edge 81 from damaging the sealing effect of the first sealing structure 5, when the tube blank 8 is installed in the annular installation gap 4, the lowest position of the sealing of the first sealing structure 5 is higher than the highest position of the process waste edge 81 in the axial direction of the mold core 2.

[0039] In some embodiments of this utility model, the second sealing structure 6 includes an annular second sealing groove and a second sealing ring embedded in the second sealing groove, and the second sealing structure 6 can fit tightly against the inner wall of the mold shell 1.

[0040] Specifically, the second sealing structure 6 enables a sealed connection between the core channel 21 and the hydraulic channel 3 of the third mold section 13. In some embodiments, the second sealing structure 6 is located below the external thread of the mounting section 23; in other embodiments, the second sealing structure 6 is located above the external thread of the mounting section 23.

[0041] In some embodiments of this utility model, in order to facilitate and quickly install the tube blank 8 into the annular installation gap 4, a circumferential chamfer 7 is provided at the top of the mold core 2.

[0042] In some embodiments of this utility model, the first sealing ring 52 has a circular cross-section. The circular cross-section of the first sealing ring 52 has stronger support and elasticity, which helps to ensure good sealing performance.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0044] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0045] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A cutting-free forming die for a pipe blank, characterized by It includes the mold shell (1) and the mold core (2). The inner wall of the mold shell (1) encloses to form a hydraulic channel (3), and the mold core (2) is coaxially disposed in the hydraulic channel (3) and its outer peripheral surface forms an annular installation gap (4) between the inner wall of the mold shell (1) to accommodate the tube blank (8). The mold core (2) has a mold core channel (21) and a sealing structure, which enables the hydraulic channel (3) to be sealed and connected to the cavity of the tube blank (8) through the mold core channel (21).

2. The tube blank free-cut-up forming die according to claim 1, characterized in that, The mold shell (1) includes a mold core mounting section (23) and a third mold section (13), and the mold core mounting section (23) includes a first mold section (11) and a second mold section (12). The mold core (2) is installed on the mold core mounting section (23). The mold core (2) includes an upper working section (22) and a lower mounting section (23). The working section (22) forms the annular mounting gap (4) between itself and the inner wall of the first mold section (11). The mounting section (23) is detachably connected to the inner wall of the second mold section (12), and the sealing structure enables the mold core channel (21) to be sealed and connected to the hydraulic channel (3) of the third mold section (13).

3. The tube blank free-cut-up forming die according to claim 2, characterized in that The periphery of the mounting section (23) has an external thread that can be threadedly connected to the internal thread of the inner wall of the second mold section (12).

4. The tube blank free-cut-up forming die according to claim 3, characterized in that The sealing structure includes a first sealing structure (5) and a second sealing structure (6). The first sealing structure (5) is located in the working section (22) and can seal the connection between the tube cavity of the tube blank (8) and the mold core channel (21). The second sealing structure (6) is located in the installation section (23) and can seal the connection between the mold core channel (21) and the hydraulic channel (3) of the third mold section (13).

5. The tube blank free-cut-up forming die according to claim 4, characterized in that The first sealing structure (5) includes an annular first sealing groove (51) and a first sealing ring (52) embedded in the first sealing groove (51). When the tube blank (8) is installed in the annular installation gap (4), the first sealing ring (52) can fit tightly against the inner wall of the tube blank (8).

6. The tube blank free-cut-up forming die according to claim 5, wherein The number of the first sealing structure (5) is at least two.

7. The tube blank free-cut-up forming die according to claim 6, characterized in that When the tube blank (8) is installed in the annular mounting gap (4), the lowest position of the first sealing structure (5) in the axial direction of the mold core (2) is higher than the highest position of the process waste edge (81) of the tube blank (8).

8. The tube blank free-cut-up forming die of claim 4 wherein, The second sealing structure (6) includes an annular second sealing groove and a second sealing ring embedded in the second sealing groove. The second sealing structure (6) can fit tightly against the inner wall of the mold shell (1).

9. The tube blank free-cut-up forming die of claim 2 wherein, The top of the mold core (2) has a circumferential chamfer (7).

10. The tube blank free-cut-up forming die of claim 5 wherein, The first sealing ring (52) has a circular cross-section.

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