Aluminum alloy pipe core roll bending die

Abstract

The utility model discloses an aluminum alloy tubular product core shaft roll bending die, including wheel mould and guide mould, wheel mould includes base and wheel mould body, wheel mould body sets up on the base, and the height of wheel mould body is 68mm, and the diameter is 76mm, and the central position of wheel mould body is provided with the installation hole that goes through up and down, and the diameter is 21.8mm, and the side of wheel mould body is provided with installation groove, and is provided with the block in installation groove, and the opposite side of block is provided with the guide mould of same specification. The utility model discloses simple structure, can connect wheel mould and block well in outside, and then can use after installing to roll bending machine, better guarantee the requirement of aluminum alloy tubular product bending forming, satisfy the need of production use.

Description

Technical Field

[0001] This utility model relates to a roller bending die, and more particularly to a roller bending die for an aluminum alloy tube mandrel. Background Technology

[0002] Aluminum alloys possess excellent plasticity, making them an irreplaceable material in metal bending and forming. Furthermore, aluminum alloy tubes offer high roll bending efficiency. The roll bending process effectively eliminates residual stress within the aluminum alloy tubes, improves stress distribution, and enhances surface quality and mechanical properties. Roll bending also typically allows for faster shape changes, increasing production efficiency. This design is applied to the fabrication of the side ladders for a motorhome roll cage. Due to the requirements for small size, smooth surface, and high strength in motorhome ladders, welding at the bends would result in numerous unsightly weld seams and cause deformation, affecting the installation of the steps and ladders. Considering these factors, a dedicated tube mandrel roll bending die was designed. Additionally, the small size of the motorhome ladder necessitates continuous roll bending. The design requires a 95mm gap between the two roll bending points, placing demands on the roll bending die, as ordinary roll bending dies cannot handle this continuous roll bending operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an aluminum alloy tube mandrel bending mold that can continuously bend two bending points with a spacing of 95mm on a boarding ladder.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A mandrel bending die for aluminum alloy tubes includes a wheel die and a guide die. The wheel die includes a base and a wheel die body. The wheel die body is disposed on the base. The height of the wheel die body is 68mm and the diameter is 76mm. A through mounting hole with a diameter of 21.8mm is provided at the center of the wheel die body. A mounting groove is provided on the side of the wheel die body. A block is disposed in the mounting groove. A guide die of the same specification is disposed on the opposite side of the block.

[0005] Furthermore, the wheel mold body includes an upper wheel mold and a lower wheel mold, which are connected together by a connecting column. The upper wheel mold, the lower wheel mold, and the connecting column are an integrated structure. A semi-circular circumferential mold groove with a radius of 20mm is formed between the upper wheel mold, the lower wheel mold, and the connecting column, surrounding the outer wall of the connecting column.

[0006] Furthermore, the mounting groove is an open L-shaped groove that extends from the upper end face of the upper wheel mold through the connecting post to the lower end face of the lower wheel mold.

[0007] Furthermore, the height and width of the mounting groove match the height and width of the assembly block, the length of the mounting groove is half the length of the assembly block, and a pair of internal threaded holes are provided on both the upper and lower sides along the length of the mounting groove.

[0008] Furthermore, the assembly block is a cuboid shape with a length of 70mm, a height of 68mm, and a width of 25mm. A pair of countersunk screw holes are also provided on the upper and lower sides along the length of the assembly block, and the size of the countersunk screw holes matches the size of the internal thread hole.

[0009] Furthermore, a semi-circular mold groove with a diameter of 20mm is provided between the countersunk screw holes on the upper and lower sides along the length direction of the assembly block. After the assembly block is installed in the installation groove, the semi-circular mold groove matches the contacting semi-circular circumferential mold groove, which facilitates the subsequent roll bending of the pipe.

[0010] Furthermore, the base is a circular base with a height of 12mm and a diameter of 100mm. The base and the wheel mold body are arranged concentrically. A 12mm wide and 6mm high slot is provided on a straight line passing through the center point of the circle at the lower end of the base, which makes installation more convenient. The slot corresponds vertically to the mounting hole.

[0011] Furthermore, this roller bending die has strict requirements for roughness, flatness, and perpendicularity. The roughness of the mounting surface shall not exceed Ra3.2, and the roughness of other positions shall not exceed Ra6.4. The perpendicularity between the two mounting surfaces shall not exceed 0.1mm, and the flatness of the mounting surface shall not exceed 0.1mm.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model consists of a wheel mold, a block, and a guide mold. The overall size and structure are designed according to the required distance of 95mm between the two points of continuous roller bending, which can meet the requirements of continuous roller bending. The overall structure is simple and easy to use. It effectively meets the bending and forming requirements of aluminum alloy tubes, and better ensures the production efficiency, process structural strength, and aesthetic appearance of the RV boarding ladder.

[0013] 2. This utility model has a simple structure. The wheel mold and the assembly block can be connected externally and then installed on the roller bending machine for use, which better ensures the requirements of aluminum alloy tube bending and forming and meets the needs of production.

[0014] 3. The mold installation dimensions of this utility model are fixed, which facilitates good usability and economy, avoids the chaos of repeated design, and shortens the design cycle.

[0015] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some schematic diagrams of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 Simplified structural diagram of the intermediate wheel mold; Figure 3 for Figure 2 Sectional view along the AA direction; Figure 4 for Figure 1 Simplified structural diagram of the middle module or guide mold; Figure 5 for Figure 4 Diagram showing direction A in the middle; Figure 6 for Figure 4 Diagram of the B-direction; Figure 7 for Figure 4 Diagram showing the C-direction.

[0018] In the diagram: 1-wheel mold, 11-base, 111-bottom mounting hole, 112-slot, 12-wheel mold body, 121-upper wheel mold, 122-lower wheel mold, 123-connecting post, 124-circumferential mold groove, 125-mounting hole, 126-mounting groove, 127-internal threaded hole, 2-guide mold, 3-piece, 31-countersunk screw hole, 32-semi-circular mold groove. Detailed Implementation

[0019] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0022] Example: Figure 1-7 As shown: A mandrel bending die for aluminum alloy tubes includes a wheel die 1 and a guide die 2. The wheel die 1 includes a base 11 and a wheel die body 12, with the wheel die body 12 disposed on the base 11.

[0023] The wheel mold body 12 includes an upper wheel mold 121 and a lower wheel mold 122, which are connected together by a connecting column 123. The upper wheel mold 121, the lower wheel mold 122 and the connecting column 123 are an integrated structure. The height of the wheel mold body 12, i.e. the straight-line distance from the upper end face of the upper wheel mold 121 to the lower end face of the lower wheel mold 122, is 68mm. The diameter of the upper wheel mold 121 and the lower wheel mold 122 is 76mm. A semi-circular circumferential mold groove 124 with a radius of 20mm is formed between the upper wheel mold 121, the lower wheel mold 122 and the connecting column 123 and the connecting column 123.

[0024] The radius of the circumferential mold groove 124 matches the radius of the corresponding pipe.

[0025] The centers of the upper die 121, the lower die 122 and the connecting column 123 are on the same vertical line. A mounting hole 125 with a diameter of 21.8mm is provided at the center of each circle to facilitate bolting and assembly with the mounting holes on the roller bending machine.

[0026] The side of the wheel mold body 12 is provided with a mounting groove 126, which is an open L-shaped groove that extends from the upper end face of the upper wheel mold 121 through the connecting post 123 to the lower end face of the lower wheel mold 122.

[0027] The mounting groove 126 is provided with a block 3. The height and width of the mounting groove 126 match the height and width of the block 3. The length of the mounting groove 126 is half the length of the block 3. A pair of internal threaded holes 127 are provided on the upper and lower sides along the length of the mounting groove 126.

[0028] The assembly block 3 is a cuboid with a length of 70mm, a height of 68mm, and a width of 25mm. Both the top and bottom sides of the length direction of the assembly block 3 are provided with a pair of countersunk screw holes 31. The size of the countersunk screw holes 31 matches the size of the internal thread hole 127. The assembly block 3 is fixed in the mounting groove 126 by using countersunk bolts through the corresponding internal thread hole 127 and countersunk screw hole 31.

[0029] A semi-circular mold groove 32 with a diameter of 20mm is provided between the countersunk screw holes 31 on the upper and lower sides along the length direction of the assembly block 3. After the assembly block 3 is installed in the mounting groove 126, the semi-circular mold groove 32 matches the semi-circular circumferential mold groove 124 that comes into contact, which facilitates the subsequent roll bending of the pipe.

[0030] The surface roughness of the mounting surface shall not exceed Ra3.2, and the roughness of other locations shall not exceed Ra6.4. The perpendicularity between the two mounting surfaces shall not exceed 0.1mm, and the flatness of the mounting surface shall not exceed 0.1mm.

[0031] The base 11 is a circular base with a height of 12mm and a diameter of 100mm. The base 11 and the wheel mold body 12 are arranged in concentric circles. A bottom mounting hole 111 that runs vertically through the center of the base 11 is provided. A slot 112 with a height of 6mm and a width of 12mm is provided on a straight line passing through the center point of the lower end of the base 11, making installation more convenient.

[0032] Opposite to block 3 is a guide mold 2 of the same specification as block 3 on the roller bending machine. The guide mold 2 is also provided with countersunk screw holes 31 to facilitate fixing the guide mold 2 on the roller bending machine.

[0033] During the roll bending process, a 40mm diameter tube for manufacturing the RV loading ladder is placed on the wheel mold 1 connected to the assembly block 3, ensuring the tube is completely within the mold groove. Then, the guide mold 2 mounted on the roll bending machine presses the profile between the guide mold 2 and the wheel mold 1, and then the roll bending is performed by the roll bending machine. After one bend, because the assembly block 3 is 70mm long and the distance between two bends is 95mm, the next bend can be continued, which can meet the requirements of continuous roll bending. The overall structure is simple and easy to use, effectively meeting the bending and forming requirements of aluminum alloy tubes, and better ensuring the production efficiency, process structural strength, and aesthetic appearance of the RV loading ladder.

[0034] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

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