Machining technology for aluminum alloy pipe fitting and composite forming die

Abstract

The invention relates to the technical field of aluminum alloy pipe fitting manufacturing, and particularly discloses a machining process for an aluminum alloy pipe fitting and a composite forming die. The machining process for the aluminum alloy pipe fitting comprises the steps that firstly, a to-be-machined pipe fitting is placed on a lower die structure, and the to-be-machined pipe fitting is positioned; then the upper die structure, the left die structure and the right die structure are driven to move, so that the to-be-machined pipe fitting is pressed, and meanwhile, a gap is formed between the upper die structure and the to-be-machined pipe fitting, so that the to-be-machined pipe fitting can be prevented from being crushed; then the upper die structure is driven to continue to move so that the upper die structure can press the to-be-machined pipe fitting; and finally, the inner core shaft is inserted into the to-be-machined pipe fitting, so that modeling of the to-be-machined pipe fitting is completed. By controlling the opening and closing sequence of the upper mold structure, the left mold structure, the right mold structure and the lower mold structure, it is guaranteed that a pipe fitting is smoothly formed, and the problems of mold closing lines, clamping damage and the like are avoided.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy pipe manufacturing technology, and in particular to a processing technology and composite molding die for aluminum alloy pipes. Background Technology

[0002] Currently, in existing technologies, the one-time forming of aluminum alloy bicycle tubes typically requires three-stage cold pressing: flattening in the first cavity, bending in the second cavity, and extruding the tube through an internal forming mandrel in the third cavity to complete the tube's appearance. However, this method involves many mold processes, and each process requires manual placement by operators, resulting in long production times for a single tube and affecting production efficiency. Furthermore, during the tube forming process, when using composite molding dies for mold closing, most bicycle tubes not only have flat shapes but also curved shapes. Based on the principle of constant perimeter, a round tube becomes a polygonal tube, and the downward pressure of the upper mold structure will inevitably cut into the tube, causing damage to the tube. Summary of the Invention

[0003] The purpose of this invention is to provide a processing technology and composite molding die for aluminum alloy pipe fittings, so as to solve the problem that aluminum alloy pipe fittings are prone to pressure damage during the molding process in the prior art.

[0004] On one hand, the present invention provides a processing technology for aluminum alloy pipe fittings. This processing technology includes a composite molding die, which comprises a press body and an upper die structure, a lower die structure, a left die structure, a right die structure, and an inner mandrel disposed on the press body. The processing technology further includes: placing the pipe fitting to be processed on the lower die structure and positioning the pipe fitting; driving the upper die structure, the left die structure, and the right die structure to move to press the pipe fitting, wherein the left die structure, the right die structure, and the lower die structure first press the pipe fitting, at which point there is a gap between the upper die structure and the pipe fitting; driving the upper die structure to continue moving to press the pipe fitting; and inserting the inner mandrel into the pipe fitting to complete the shaping of the pipe fitting.

[0005] As an optional technical solution for the processing of aluminum alloy pipe fittings, "when the left mold structure, the right mold structure, and the lower mold structure press the pipe fitting to be processed together, there is a gap between the upper mold structure and the pipe fitting to be processed" includes: The gap between the upper mold structure and the pipe to be processed is 8mm-12mm.

[0006] As an optional technical solution for the processing of aluminum alloy pipe fittings, the gap between the upper mold structure and the pipe fitting to be processed is 10mm.

[0007] As an optional technical solution for the processing of aluminum alloy pipe fittings, the processing technology for the composite forming mold of aluminum alloy pipe fittings further includes: After the shape of the pipe to be processed is completed, the inner mandrel is pulled out from the pipe to be processed, and then the upper mold structure is lifted.

[0008] On the other hand, the present invention provides a composite molding die applicable to the processing technology for aluminum alloy tubes in any of the above-mentioned schemes. The composite molding die includes: a press body; a lower die structure disposed on the lower table of the press body; a left die structure and a right die structure disposed on the lower table of the press body, respectively located on both sides of the lower die structure; an upper die structure including an upper die body and an elastic element, the upper die body being vertically and vertically disposed on the upper table of the press body, the elastic element being disposed between the upper die body and the left die structure and / or the right die structure, and being configured to always have an elastic force that keeps the upper die body away from the left die structure or the right die structure, and a tube forming cavity is formed between the upper die structure, the lower die structure, the left die structure and the right die structure; and an inner mandrel movably disposed on the lower table of the press body and used to extrude the tube to be processed located in the tube forming cavity.

[0009] As an optional technical solution for composite molding dies, there are multiple elastic elements, which are spaced apart between the upper mold body and the left mold structure and / or the right mold structure.

[0010] As an optional technical solution for composite molding dies, the elastic element is a spring.

[0011] As an optional technical solution for composite molding dies, the left mold structure includes a left mold body and a left mold pushing block. The left mold pushing block abuts against the left mold body. The left mold body and the lower table of the press body are slidably connected and located on one side of the lower mold structure. The left mold pushing block is movably disposed on the lower table of the press body to drive the left mold body to move. The left mold body is used to press the pipe to be processed. The elastic element is disposed between the upper mold body and the left mold pushing block.

[0012] As an optional technical solution for composite molding dies, the lower die structure includes a lower die body and a positioning component. The lower die body is disposed on the lower table surface of the press body, and the positioning component is disposed at one end of the lower die body and corresponds to the tube forming cavity. The positioning component is used to position the tube to be processed located in the tube forming cavity.

[0013] As an optional technical solution for composite molding molds, the positioning component includes a positioning block and a positioning plate. The positioning block is disposed at one end of the lower mold body, and one end of the positioning plate passes through the positioning block and is located in the forming cavity of the pipe. The positioning plate can be inserted into the cavity of the pipe to be processed, and the positioning block can abut against the end of the pipe to be processed.

[0014] The beneficial effects of this invention are as follows: This invention provides a processing technology for aluminum alloy pipe fittings. The processing technology includes: first, placing the pipe fitting to be processed on the lower mold structure and positioning it to ensure that it is in a preset position for easy processing in the next step; then driving the upper mold structure, left mold structure, and right mold structure to move, thereby pressing the pipe fitting to be processed. The left mold structure, right mold structure, and lower mold structure are used to press the pipe fitting to be processed first, at which point the pipe fitting to be processed has become a flat tube with three-sided shaping, while creating a gap between the upper mold structure and the pipe fitting to avoid damage to the pipe fitting; then driving the upper mold structure to continue moving, so that the upper mold structure presses the pipe fitting to be processed; finally, inserting the inner mandrel into the pipe fitting to complete the shaping of the pipe fitting. Since most bicycle tubes not only have flat shapes but also curved shapes, according to the principle of constant perimeter, when a round tube becomes a polygonal tube, the downward pressure of the upper mold structure will inevitably cut into the tube, causing damage. By using the processing technology for aluminum alloy tubes of this invention, the opening and closing sequence between the upper mold structure, left mold structure, right mold structure and lower mold structure is controlled to ensure smooth forming of the tube and avoid problems such as parting lines and pinching damage. This effectively solves the problem of easy damage to aluminum alloy tubes during the forming process in the prior art. Attached Figure Description

[0015] Figure 1 This is a flowchart of the processing technology for aluminum alloy pipe fittings in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the composite molding die in an embodiment of the present invention; Figure 3 This is a schematic diagram of the composite molding die from another angle in an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the composite molding die structure in an embodiment of the present invention.

[0016] In the picture: 1. Press body; 2. Lower mold structure; 21. Lower mold body; 22. Positioning components; 221. Positioning block; 222. Positioning plate; 3. Left mold structure; 31. Left mold body; 32. Left mold push block; 4. Right mold structure; 5. Upper mold structure; 51. Upper mold body; 52. Elastic component; 6. Inner mandrel; 7. Pipe fitting forming cavity. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1 to 5 As shown, this embodiment provides a processing technology for aluminum alloy pipe fittings, including a composite molding die. The composite molding die includes a press body 1 and an upper die structure 5, a lower die structure 2, a left die structure 3, a right die structure 4, and an inner mandrel 6 disposed on the press body 1. The processing technology for aluminum alloy pipe fittings further includes: firstly, placing the pipe fitting to be processed on the lower die structure 2 and positioning the pipe fitting to be processed to ensure that the pipe fitting to be processed is in a preset position for easy processing in the next step; then driving the upper die structure 5, the left die structure 3, and the right die structure 4 to move, thereby pressing the pipe fitting to be processed. The left die structure 3, the right die structure 4, and the lower die structure 2 are used to press the pipe fitting to be processed first. At this time, the pipe fitting to be processed has become a flat tube with three-sided shaping. At the same time, there is a gap between the upper die structure 5 and the pipe fitting to be processed, which can avoid damaging the pipe fitting to be processed; then driving the upper die structure 5 to continue moving, so that the upper die structure 5 presses the pipe fitting to be processed; finally, inserting the inner mandrel 6 into the pipe fitting to complete the shaping of the pipe fitting to be processed. Since most bicycle tubes not only have flat shapes but also curved shapes, according to the principle of constant perimeter, a round tube becomes a polygonal tube. The downward pressure of the upper mold structure 5 will inevitably cut into the tube, causing damage. By using the processing technology for aluminum alloy tubes of the present invention, the opening and closing sequence between the upper mold structure 5, the left mold structure 3, the right mold structure 4 and the lower mold structure 2 is controlled to ensure smooth forming of the tube and avoid problems such as parting lines and pinching damage. This effectively solves the problem of easy damage to aluminum alloy tubes during the forming process in the prior art.

[0022] In some embodiments, "when the left mold structure 3, right mold structure 4, and lower mold structure 2 press the pipe to be processed, there is a gap between the upper mold structure 5 and the pipe to be processed" includes: the gap between the upper mold structure 5 and the pipe to be processed is 8mm-12mm. This setting can prevent the upper mold structure 5 from touching the pipe to be processed when the left mold structure 3, right mold structure 4, and lower mold structure 2 press the pipe to be processed first, thereby avoiding damage to the pipe to be processed.

[0023] Furthermore, the gap between the upper mold structure 5 and the pipe to be processed is 10mm. Limiting the gap between the upper mold structure 5 and the pipe to be processed to the above value further ensures that the upper mold structure 5 will not touch the pipe to be processed, thereby preventing damage to the pipe to be processed.

[0024] In some embodiments, the processing technology of the composite molding die for aluminum alloy pipe fittings further includes: after completing the shaping of the pipe fitting to be processed, the inner mandrel 6 is pulled out from the pipe fitting to be processed, and then the upper mold structure 5 is lifted. This facilitates the processing of the next pipe fitting to be processed and improves work efficiency.

[0025] This embodiment also provides a composite molding die, applicable to the processing technology for aluminum alloy pipe fittings in the above-mentioned scheme. The composite molding die includes: a press body 1; a lower die structure 2 disposed on the lower table surface of the press body 1; a left die structure 3 and a right die structure 4, which can be disposed on the lower table surface of the press body 1 away from or close to each other, and are respectively located on both sides of the lower die structure 2; an upper die structure 5 including an upper die body 51 and an elastic element 52, the upper die body 51 being movably disposed on the upper table surface of the press body 1, the elastic element 52 being disposed between the upper die body 51 and the left die structure 3 and / or the right die structure 4, and being configured to always have an elastic force that keeps the upper die body 51 away from the left die structure 3 or the right die structure 4; a pipe fitting forming cavity 7 is formed between the upper die structure 5, the lower die structure 2, the left die structure 3 and the right die structure 4; and an inner mandrel 6, which is movably disposed on the lower table surface of the press body 1 and is used to extrude the pipe fitting to be processed located in the pipe fitting forming cavity 7. This configuration drives the left mold structure 3, right mold structure 4, and lower mold structure 2 to cooperate with each other. When the left mold structure 3, right mold structure 4, and lower mold structure 2 are tightly closed, the upper mold structure 5 is not fully closed with the tube to be processed due to the elastic element 52. Specifically, during the downward pressing of the upper mold structure 5, the left mold structure 3 and right mold structure 4 are driven to merge. When the upper mold structure 5 has 10mm left to form a closed mold, the left mold structure 3, right mold structure 4, and lower mold structure 2 are tightly closed. At this time, the tube to be processed is already a flat tube with three sides formed. Then the upper mold structure 5 is fully closed, and the side inner mandrel 6 is pressed in to complete the tube shaping. This ensures smooth tube forming and avoids problems such as mold parting lines and pinching damage, effectively solving the problem of pressure damage that easily occurs in the forming process of aluminum alloy tubes in the prior art.

[0026] In some embodiments, there are multiple elastic elements 52, which are spaced apart between the upper mold body 51 and the left mold structure 3 and / or the right mold structure 4. This arrangement ensures that a gap is formed between the upper mold structure 5 and the pipe to be processed.

[0027] In this embodiment, the elastic element 52 includes, but is not limited to, a spring.

[0028] In some embodiments, the left mold structure 3 includes a left mold body 31 and a left mold push block 32. The left mold push block 32 abuts against the left mold body 31. The left mold body 31 is slidably connected to the lower table surface of the press body 1 and is located on one side of the lower mold structure 2. The left mold push block 32 is movably disposed on the lower table surface of the press body 1. In this way, the left mold push block 32 can drive the left mold body 31 to move, and the left mold body 31 presses the pipe to be processed. The elastic element 52 is disposed between the upper mold body 51 and the left mold push block 32.

[0029] In this embodiment, the lower mold structure 2 includes a lower mold body 21 and a positioning member 22. The lower mold body 21 is disposed on the lower table surface of the press body 1, and the positioning member 22 is disposed at one end of the lower mold body 21 and corresponds to the pipe forming cavity 7. The positioning member 22 can be used to position the pipe to be processed located in the pipe forming cavity 7.

[0030] Furthermore, the positioning component 22 includes a positioning block 221 and a positioning plate 222. The positioning block 221 is set at one end of the lower mold body 21, and one end of the positioning plate 222 passes through the positioning block 221 and is located in the pipe forming cavity 7. The positioning plate 222 is inserted into the cavity of the pipe to be processed, thereby positioning the pipe to be processed; the positioning block 221 can abut against the end of the pipe to be processed.

[0031] It should be noted that the main body 1 of the press is usually equipped with hydraulic cylinders or air cylinders to drive the upper mold structure 5, lower mold structure 2, left mold structure 3 and right mold structure 4 to move, thereby realizing the opening and closing of the mold.

[0032] The advantages of the processing technology for aluminum alloy tubular fittings of the present invention are as follows: 1. Improve production efficiency. Traditional pipe fitting molding requires a three-cavity mold, and the three cavities are manually picked up and rotated in sequence during the production process. The composite molding mold of this invention can form a single cavity, and can achieve unmanned operation when combined with a robotic arm.

[0033] 2. The molding time for a single pipe fitting is reduced by 1 / 2.

[0034] 3. The quality is stable, and there will be no manual misplacement problems during the original three-cavity rotation process, which would cause the pipe fittings to be scrapped.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A processing technology for aluminum alloy pipe fittings, comprising a composite forming mold, the composite forming mold comprising a press body (1) and an upper mold structure (5), a lower mold structure (2), a left mold structure (3), a right mold structure (4), and an inner mandrel (6) disposed on the press body (1), characterized in that, The processing technology for aluminum alloy pipe fittings also includes: The pipe to be processed is placed in the lower mold structure (2), and the pipe to be processed is positioned. Drive the upper mold structure (5), the left mold structure (3), and the right mold structure (4) to move to press the pipe to be processed. The left mold structure (3), the right mold structure (4), and the lower mold structure (2) first press the pipe to be processed. At this time, there is a gap between the upper mold structure (5) and the pipe to be processed. Drive the upper mold structure (5) to continue moving so that the upper mold structure (5) presses the pipe to be processed; Insert the inner mandrel (6) into the pipe to be processed to complete the shaping of the pipe.

2. The processing technology for aluminum alloy pipe fittings according to claim 1, characterized in that, "When the left mold structure (3), the right mold structure (4), and the lower mold structure (2) press the pipe to be processed together, there is a gap between the upper mold structure (5) and the pipe to be processed" includes: The gap between the upper mold structure (5) and the pipe to be processed is 8mm-12mm.

3. The processing technology for aluminum alloy pipe fittings according to claim 2, characterized in that, The gap between the upper mold structure (5) and the pipe to be processed is 10mm.

4. The processing technology for aluminum alloy pipe fittings according to claim 1, characterized in that, The processing technology for the composite molding die used for aluminum alloy pipe fittings also includes: After the shape of the pipe to be processed is completed, the inner mandrel (6) is pulled out from the pipe to be processed, and then the upper mold structure (5) is lifted.

5. A composite molding die, characterized in that, The composite molding die, applicable to the processing technology for aluminum alloy tubular fittings according to any one of claims 1-4, comprises: Press body (1); The lower mold structure (2) is disposed on the lower table surface of the press body (1); The left mold structure (3) and the right mold structure (4) can be arranged on the lower table surface of the press body (1) away from each other or close to each other, and are respectively located on both sides of the lower mold structure (2); The upper mold structure (5) includes an upper mold body (51) and an elastic element (52). The upper mold body (51) is vertically and vertically disposed on the upper table of the press body (1). The elastic element (52) is disposed between the upper mold body (51) and the left mold structure (3) and / or the right mold structure (4), and is configured to always have an elastic force that keeps the upper mold body (51) away from the left mold structure (3) or the right mold structure (4). A tube forming cavity (7) is formed between the upper mold structure (5), the lower mold structure (2), the left mold structure (3) and the right mold structure (4). The inner mandrel (6) is movably disposed on the lower table of the press body (1) and is used to extrude the pipe to be processed located in the pipe forming cavity (7).

6. The composite molding die according to claim 5, characterized in that, There are multiple elastic elements (52), and the multiple elastic elements (52) are spaced apart between the upper mold body (51) and the left mold structure (3) and / or the right mold structure (4).

7. The composite molding die according to claim 5, characterized in that, The elastic element (52) is a spring.

8. The composite molding die according to claim 5, characterized in that, The left mold structure (3) includes a left mold body (31) and a left mold push block (32). The left mold push block (32) abuts against the left mold body (31). The left mold body (31) is slidably connected to the lower table of the press body (1) and is located on one side of the lower mold structure (2). The left mold push block (32) is movably disposed on the lower table of the press body (1) to drive the left mold body (31) to move. The left mold body (31) is used to press the pipe to be processed. The elastic element (52) is disposed between the upper mold body (51) and the left mold push block (32).

9. The composite molding die according to claim 5, characterized in that, The lower mold structure (2) includes a lower mold body (21) and a positioning element (22). The lower mold body (21) is disposed on the lower table surface of the press body (1). The positioning element (22) is disposed at one end of the lower mold body (21) and corresponds to the pipe forming cavity (7). The positioning element (22) is used to position the pipe to be processed located in the pipe forming cavity (7).

10. The composite molding die according to claim 9, characterized in that, The positioning component (22) includes a positioning block (221) and a positioning plate (222). The positioning block (221) is disposed at one end of the lower mold body (21). One end of the positioning plate (222) passes through the positioning block (221) and is located in the tube forming cavity (7). The positioning plate (222) can be inserted into the cavity of the tube to be processed, and the positioning block (221) can abut against the end of the tube to be processed.

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