Aluminum tube necker

Abstract

The utility model belongs to aluminum alloy cold working technology field relates to a kind of aluminium pipe necking device, including base, the top of base is installed necking die module component and drawing module component, wherein drawing module component is used to press and fix aluminium pipe, necking die module component is used to carry out necking operation to the aluminium pipe end portion fixedly;The necking die module component is driven by the execution component installed on the top of base;The necking die module component includes necking die body and the die core fixed in the working end cavity of necking die body, the inner hole of die core is successively structured as horn opening, working cone and sizing band from outside to inside, necking die body is equipped with the guide hole passing through axially, the guide hole is coaxially arranged with the inner hole of die core, and sizing band realizes the surface regularity after the necking of aluminium pipe.The necking device structure is simple, easy to operate, and the quality of grinding tip is good, can solve the problem of aluminium tube drawing wire drawing caused by grinding tip problem.

Description

Technical Field

[0001] This utility model relates to an aluminum tube shrinking device, belonging to the field of aluminum alloy cold working technology. Background Technology

[0002] When cold-drawing aluminum alloy hard tubes such as 2024, 5049, 5052, and 7075, one end of the tube blank needs to be pointed before drawing to facilitate subsequent processing. Currently, a head-rolling machine is generally used to point the aluminum tube. This pointing process is noisy, and the pointed end often lacks a smooth transition, resulting in defects such as sharp corners, burrs, protrusions, and debris. This leads to grooving defects starting from the pointed end during the subsequent cold drawing process. Grooving is an unacceptable defect in aluminum tubes, requiring them to be scrapped, significantly reducing the product yield. If this defect is missed and reaches the customer, it can cause serious consequences such as cracking and leakage during processing. Summary of the Invention

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide an aluminum tube shrinking device. This shrinking device has a simple structure, is easy to operate, and has good tipping quality, which can solve the problem of aluminum tube drawing and wire pulling caused by tipping issues.

[0004] According to the technical solution provided by this utility model, an aluminum tube shrinking device is characterized in that: it includes a base, and a shrinking mold assembly and a drawing mold assembly are installed on the top of the base, wherein the drawing mold assembly is used to press and fix the aluminum tube, and the shrinking mold assembly is used to shrink the end of the fixed aluminum tube. The head-shrinking mold assembly is driven by an actuator mounted on the top of the base; The shrinking die assembly includes a shrinking die body and a die core fixed in the working end cavity of the shrinking die body. The inner hole of the die core is constructed from the outside to the inside as a trumpet opening, a working cone and a sizing band. The shrinking die body is provided with an axially penetrating guide hole. The guide hole is coaxially arranged with the inner hole of the die core. The sizing band achieves surface regularization of the aluminum tube after shrinking.

[0005] As a further improvement of this utility model, the circumferential surface of the working end of the shrinking mold body is provided with a positioning groove for fixed connection with the shrinking mold base.

[0006] As a further improvement of this utility model, the actuating component includes a head-shrinking mold hydraulic cylinder, a head-shrinking mold slide rail, and a head-shrinking mold base. The head-shrinking mold assembly is fixed to the head-shrinking mold base, the head-shrinking mold base is slidably connected to the head-shrinking mold slide rail, and the piston rod end of the head-shrinking mold hydraulic cylinder is fixedly connected to the head-shrinking mold base.

[0007] As a further improvement of this utility model, the drawing die assembly includes a pressure die hydraulic cylinder, an upper pressure die, and a lower pressure die. The lower pressure die is fixed on the base, and the upper pressure die is driven by the pressure die hydraulic cylinder and cooperates with the lower pressure die to press the aluminum tube.

[0008] As a further improvement of this utility model, the cone angle of the working cone is 12°-16°.

[0009] As a further improvement of this utility model, the positioning groove includes two annular grooves.

[0010] As a further improvement of this utility model, the diameter of the guide hole is 1-2 mm larger than the diameter of the sizing belt.

[0011] Compared with existing technologies, this utility model has the following advantages: The structure of this utility model is simple, compact, and reasonable; the head-reducing die structure matches the drawing die structure, and its working cone angle is smaller than that of the drawing die, which is beneficial for the introduction of lubricating oil during drawing and reduces wire drawing. The head-reducing die core is made of cemented carbide, which has good surface roughness, ensuring a small surface roughness of the aluminum tube in the head-reducing area after head reduction, thus reducing wire drawing. During head reduction, a hydraulic cylinder applies pressure to push the head-reducing die forward, completing the head reduction of the tube blank end, resulting in low noise. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the aluminum tube shrinking device of this utility model.

[0013] Figure 2 This is a schematic diagram of the mold closing mechanism.

[0014] Figure 3 This is a schematic diagram of the shrinking mold. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely 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 should fall within the protection scope of the present invention.

[0017] like Figures 1-3As shown, this utility model mainly includes a head-shrinking mold hydraulic cylinder 1, a head-shrinking mold slide rail 2, a head-shrinking mold base 3, a head-shrinking mold assembly 4, a flared opening 41, a working cone 42 and a sizing belt 43, a guide hole 44, a positioning groove 45, a mold core 46, a pressing mold hydraulic cylinder 5, an upper pressing mold 6, a lower pressing mold 7, and a base 8, etc.

[0018] like Figure 1-3 As shown, this utility model is an aluminum tube shrinking device, including a base 8. A shrinking mold assembly 4 and a drawing mold assembly are installed on the top of the base 8. The drawing mold assembly is used to press and fix the aluminum tube, and the shrinking mold assembly 4 is used to shrink the end of the fixed aluminum tube.

[0019] The head-shrinking mold assembly 4 is driven by an actuator mounted on top of the base 8.

[0020] The shrinking die assembly 4 includes a shrinking die body and a die core 46 fixed in the working end cavity of the shrinking die body. The inner hole of the die core 46 is constructed sequentially from the outside to the inside as a flared opening 41, a working cone 42, a sizing band 43, and a guide hole 44. The working cone 42 has a cone angle of 12°-16°. The shrinking die body has an axially penetrating guide hole 44, which is coaxially arranged with the inner hole of the die core 46. The sizing band 43 achieves surface straightening of the aluminum tube after shrinking. The die core 46 is made of cemented carbide YG8. After the end of the aluminum tube is gradually deformed and compressed through the flared opening 41 and the working cone 42, it enters the sizing band 43. Here, the outer diameter of the aluminum tube is finally calibrated to a precise and consistent size, ensuring that the diameter of the end of the aluminum tube after shrinking meets the design requirements. The sizing belt 43 performs the final "finishing" on the aluminum tubes, eliminating irregular shapes that may be caused by deformation in the front section, making the constricted part of the aluminum tube smooth, without sharp corners or burrs, thereby improving the surface quality and avoiding defects such as wire drawing and grooving during subsequent drawing processes.

[0021] The circumferential surface of the working end of the head-shrinking mold body is provided with a positioning groove 45 for fixed connection with the head-shrinking mold base 3.

[0022] The actuating components include a head-shrinking mold hydraulic cylinder 1, a head-shrinking mold slide rail 2, and a head-shrinking mold base 3. The head-shrinking mold assembly 4 is fixed to the head-shrinking mold base 3, and the head-shrinking mold base 3 is slidably connected to the head-shrinking mold slide rail 2. The piston rod end of the head-shrinking mold hydraulic cylinder 1 is fixedly connected to the head-shrinking mold base 3. Under the action of the head-shrinking mold hydraulic cylinder 1, the head-shrinking mold base 3 can slide back and forth on the head-shrinking mold slide rail 2.

[0023] The drawing die assembly includes a pressure die hydraulic cylinder 5, an upper pressure die 6, and a lower pressure die 7. The lower pressure die 7 is fixed on the base 8. The upper pressure die 6 is driven by the pressure die hydraulic cylinder 5 and cooperates with the lower pressure die 7. After the upper pressure die 6 and the lower pressure die 7 are closed, a circular hole is formed to press the aluminum tube.

[0024] The positioning groove 45 includes two annular grooves, which, through symmetrical double-point fixation, effectively resist the torsional torque generated during the head reduction process, absolutely ensuring that the head reduction die does not undergo any circumferential rotation in the die holder, thereby ensuring that its center is always aligned with the axis of the entire equipment. This is a key structural design for achieving high-quality, defect-free head reduction processing and avoiding problems in subsequent drawing.

[0025] The diameter of the guide hole 44 is 1-2 mm larger than the diameter of the sizing belt 43.

[0026] like Figure 1-3 As shown, the working process of this utility model is as follows: Before shrinking the aluminum tube, according to the specifications of the aluminum tube to be shrunk and the required dimensions after shrinking, replace the corresponding shrinking die 4, upper die 6, and lower die 7. Turn on the working switch of the control panel 9, the die opens, and the working cycle is set. Apply lubricating oil to the head of the aluminum tube, and then place it into the die. The head of the aluminum tube contacts the opening of the shrinking die 4, the die closes, and the shrinking die hydraulic cylinder 1 pushes the shrinking die base 3 and the shrinking die 4 forward. After shrinking, return to the starting point to complete the shrinking. The die opens, the aluminum tube is removed, and the previous round of actions is repeated.

[0027] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An aluminum tube shrinking device, characterized in that: Includes a base (8), on the top of which a shrinking die assembly (4) and a drawing die assembly are installed, wherein the drawing die assembly is used to press and fix the aluminum tube, and the shrinking die assembly (4) is used to shrink the end of the fixed aluminum tube. The head-shrinking mold assembly (4) is driven by an actuating component mounted on top of the base (8); The shrinking die assembly (4) includes a shrinking die body and a die core (46) fixed in the working end cavity of the shrinking die body. The inner hole of the die core (46) is constructed from the outside to the inside as a horn opening (41), a working cone (42) and a sizing band (43). The shrinking die body is provided with an axially penetrating guide hole (44). The guide hole (44) is coaxially arranged with the inner hole of the die core (46). The sizing band (43) realizes the surface regularization of the aluminum tube after shrinking.

2. The aluminum tube shrinking device according to claim 1, characterized in that: The circumferential surface of the working end of the head-shrinking mold body is provided with a positioning groove (45) to be fixedly connected with the head-shrinking mold base (3).

3. The aluminum tube shrinking device according to claim 1, characterized in that: The execution components include a shrinking mold hydraulic cylinder (1), a shrinking mold slide rail (2), and a shrinking mold base (3). The shrinking mold assembly (4) is fixed to the shrinking mold base (3), the shrinking mold base (3) is slidably connected to the shrinking mold slide rail (2), and the piston rod end of the shrinking mold hydraulic cylinder (1) is fixedly connected to the shrinking mold base (3).

4. The aluminum tube shrinking device according to claim 1, characterized in that: The drawing die assembly includes a pressure die hydraulic cylinder (5), an upper pressure die (6) and a lower pressure die (7). The lower pressure die (7) is fixed on the base (8). The upper pressure die (6) is driven by the pressure die hydraulic cylinder (5) and cooperates with the lower pressure die (7) to press the aluminum tube.

5. The aluminum tube shrinking device according to claim 1, characterized in that: The cone angle of the working cone (42) is 12°-16°.

6. The aluminum tube shrinking device according to claim 2, characterized in that: The positioning groove (45) includes two annular grooves.

7. The aluminum tube shrinking device according to claim 1, characterized in that: The diameter of the guide hole (44) is 1-2 mm larger than the diameter of the sizing band (43).

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