A flanging die for a slotted bushing

Abstract

The present invention discloses a flanging die for a slotted bushing, which belongs to the field of bushing processing technology. The die comprises a forming die base and a support assembly, wherein the forming die base is provided with a flanging die inner cavity and a support accommodating cavity; the support assembly comprises a support seat, a support pad and a support spring, the support seat comprises a base and a push rod, the support pad is slidingly sleeved on the push rod, the support spring is sleeved on the push rod between the base and the support pad, and the support pad and the push rod cooperate to form a positioning groove for positioning the lower end of the slotted bushing. The present invention has a simple structure and is easy to operate. The positioning groove ensures that when the flanging bushing is placed in the flanging die inner cavity, the lower end of the bushing can be accurately placed in the positioning groove, thereby avoiding the deformation of the bottom of the bushing caused by deviation, and ensuring the flanging quality of the bushing; the flanging processing of bushing products of different lengths can be achieved by only replacing the push rod, thereby reducing the cost of the mold and enhancing the applicability of the mold.

Description

Technical Field

[0001] The invention relates to a flanging die for a slotted bushing, belonging to the technical field of bushing processing. Background Art

[0002] Slotted bushings are commonly used in aircraft mounting holes for fatigue reinforcement. They are primarily manufactured using cold extrusion technology, which features large interference, strong operability, and a pronounced extrusion effect. This technology can significantly improve the fatigue life of components made from a variety of materials. Flanging is the process of using a mold to turn the edge of a hole or outer edge of a product into a vertical straight edge or a trumpet-shaped bevel. This method imparts excellent rigidity to three-dimensional parts, and the mold used for flanging is called a flanging die.

[0003] One end of the slotted bushing has a small flange, which can provide a stable support during the hole strengthening process and facilitate installation and removal. The installation effect of the bushing after the flange is shown in the figure. Figure 12 . Flanging is the key process of the slit bushing. At present, the flanging processing of the slit bushing is mainly carried out by stamping using a punch press in combination with a flanging die. The existing flanging die is mostly a fixed structure, that is, a die cavity adapted to the slit bushing product is set in the flanging die, and the slit bushing to be flanged is placed in the die cavity, and the flanging of the end of the slit bushing is achieved by stamping or pressing. This flanging die needs to completely match the specifications of the slit bushing to be processed. Therefore, the outer circle size and height size of the slit bushing need to be considered. Slit bushings with the same outer circle size will have various height sizes. It is not possible to use a universal flanging die for slit bushings of different height sizes. Slit bushings of different heights need to replace the corresponding flanging die as a whole, which is not very applicable and is not conducive to actual use. The overall replacement of the flanging die will also increase the cost of the flanging die. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present invention provides a flanging die for a slotted bushing.

[0005] The present invention solves the above-mentioned technical problem with the following technical solution: a flanging die for a slit bushing, comprising a forming die base and a support assembly disposed in the forming die base, wherein the forming die base is provided with a flanging die inner cavity for bushing molding and a support accommodating cavity for accommodating the support assembly, wherein the flanging die inner cavity is disposed above the support accommodating cavity;

[0006] The support assembly includes a support seat, a support pad and a support spring. The support seat includes a base and a top rod arranged on the base. The support pad is slidably mounted on the top rod. The support spring is mounted on the top rod between the base and the support pad. The support pad and the top rod cooperate to form a positioning groove for the lower end of the positioning bushing.

[0007] The beneficial effects of the present invention are as follows: the upper end of the support spring acts on the support pad, and the lower end acts on the base. The push rod cooperates with the support pad to form a positioning groove for positioning the slit bushing. When the flanging bushing is placed in the inner cavity of the flanging die, the lower end of the bushing can be accurately placed in the positioning groove to avoid the deformation of the bottom of the bushing caused by deviation. The flanging bushing is stably positioned during the flanging stamping process, ensuring the flanging quality of the bushing. For the case where the same diameter bushing products have different length specifications, it is only necessary to replace the push rod of the flanging die to achieve the positioning and subsequent flanging processing of bushing products of different lengths. There is no need to replace the mold as a whole. The same mold can realize the processing of bushing products of various heights, reducing the mold cost and improving the applicability of the mold. The present invention has a simple structure and is easy to operate. The lower end of the bushing is accurately and stably positioned, avoiding the deviation of the bushing, ensuring the quality of the bushing flanging, and can be applied to bushing products of different lengths by only replacing the push rod. There is no need to replace the mold as a whole, reducing the mold cost and improving the applicability of the mold.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, a rod head is provided at the upper end of the push rod, a pad hole is provided on the support pad, a limiting shoulder for limiting the rod head is provided in the pad hole, and the diameter of the rod head is larger than the inner diameter of the limiting shoulder.

[0010] The beneficial effect of adopting the above further scheme is that the upper end of the support spring acts on the support pad, and the support pad and the top rod cooperate to form a positioning groove for positioning the bottom end of the bushing. The rod head acts on the limit shoulder, which can limit the highest position of the support pad.

[0011] Furthermore, the inner cavity of the flanging die includes a connected frustum hole and a cylindrical hole, and the frustum hole and the cylindrical hole are arranged in sequence from top to bottom in the forming die base.

[0012] The beneficial effect of adopting the above further solution is that the hole wall of the frustum hole is inclined to form the active surface when the bushing is formed, which is convenient for flanging the end of the bushing, and the cylindrical hole can wrap and support the bushing, ensuring the quality of the bushing during stamping and reducing or even avoiding its deformation.

[0013] Furthermore, the forming die base includes a die base middle section and a die base lower section, and the outer diameter of the die base lower section is smaller than the outer diameter of the die base middle section.

[0014] The beneficial effect of adopting the above-mentioned further scheme is that the lower part of the forming die base, i.e., the lower section of the die base, adopts a small-diameter section structure design, and an annular groove is formed between the lower section of the die base and the middle section of the die base, which can be engaged with the rotating bayonet on the subsequent automated flanging equipment to drive the flanging die to rotate and ensure the stability of the sleeve rotation feeding on the automated sleeve flanging equipment.

[0015] Furthermore, the forming die base further includes a die base upper section, and the outer diameter of the die base upper section is smaller than the outer diameter of the die base middle section.

[0016] The beneficial effect of adopting the above further solution is that the outer diameter of the upper section of the mold base is smaller than the outer diameter of the middle section of the mold base, which can achieve the effect of reducing weight and prevent the flanging mold from tipping over during rotation.

[0017] Furthermore, the support pad includes an upper pad body and a lower pad body, the outer diameter of the upper pad body is larger than the outer diameter of the lower pad body, and a seat groove is provided on the base, and the lower pad body can be placed in the seat groove when it moves on the support seat to eject the bushing.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that the groove depth of the seat groove is greater than the height of the lower pad. In the process of ejecting the bushing product, the base and the ejector rod move upward, the base compresses the support spring, the lower pad can be completely placed in the seat groove, and the ejector rod smoothly ejects the bushing product.

[0019] Furthermore, the push rod is connected to the base through a connecting mechanism.

[0020] The beneficial effect of adopting the above further solution is that the connection between the top rod and the base is achieved through the connecting mechanism.

[0021] Furthermore, the connecting mechanism includes a rod pin hole and a connecting pin that can be inserted into the rod pin hole. The base is provided with a positioning hole for installing the top rod, and the top rod and the base are correspondingly provided with the rod pin holes for the connecting pin to pass through.

[0022] The beneficial effect of adopting the above-mentioned further scheme is that the lower end of the push rod is placed in the positioning hole, the connecting pin is inserted from the rod pin hole on the base, and then inserted into the rod pin hole on the push rod until it passes through the rod pin hole on the base on the other side. The base and the push rod are connected by the connecting pin, which is easy to install. When facing bushing products of different lengths, the disassembly and replacement of the push rod is also very convenient. The same flanging mold can realize flanging processing of bushing products of various heights.

[0023] Furthermore, the push rod and the base are interference fit.

[0024] The beneficial effect of adopting the above-mentioned further scheme is that the outer diameter of the lower end of the push rod is larger than the aperture of the positioning hole on the base. The push rod is pressed onto the base, and the push rod and the base are transitionally matched to ensure the stability of the connection between the two, and also facilitate the subsequent disassembly and replacement of push rods of different heights.

[0025] Furthermore, it also includes an anti-slip mechanism, and the base is arranged on the forming mold base through the anti-slip mechanism.

[0026] The beneficial effect of adopting the above-mentioned further scheme is that the support assembly is installed in the forming mold base. If there is no anti-slip mechanism, the support assembly will be separated from the forming mold base when the flanging mold is picked up, which is inconvenient for the overall removal, transfer and storage of the flanging mold. The anti-slip mechanism can link the support assembly with the forming mold base without affecting the use function of the flanging mold. The support assembly can move relative to the forming mold base, but will not be separated from the forming mold base, which facilitates the overall removal, transfer and storage of the flanging mold.

[0027] Furthermore, the anti-slip mechanism includes an anti-slip key groove and an anti-slip rod whose outer end can move up and down in the anti-slip key groove. The anti-slip key groove is arranged on the forming mold base, and the inner end of the anti-slip rod is connected to the base.

[0028] The beneficial effect of adopting the above-mentioned further scheme is that the inner end of the anti-slip rod is inserted into the anti-slip key groove and connected to the base located in the forming die base, and the outer end of the anti-slip rod can move up and down in the anti-slip key groove. By controlling the length of the anti-slip key groove, the ejection height is controlled to prevent excessive ejection and interference with the unloading mechanism of the flanging equipment, which not only meets the requirement that the support component will not separate from the forming die base, but also controls the up and down movement distance of the base and the ejector rod in the forming die base. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the forming die base of the present invention;

[0031] Figure 3 This is a schematic diagram of the main structure of the forming die base of the present invention;

[0032] Figure 4 for Figure 3 Cross-section along the AA direction;

[0033] Figure 5 It is a left side structural schematic diagram of the forming die base of the present invention;

[0034] Figure 6 for Figure 5 Cross-section along the BB direction;

[0035] Figure 7 A structural schematic diagram of the forming die base of the present invention from another angle;

[0036] Figure 8 It is a structural schematic diagram of the support assembly of the present invention;

[0037] Figure 9 Schematic diagram of the cross-sectional structure of the support assembly of the present invention;

[0038] Figure 10Schematic diagram of the structure of the support pad of the present invention;

[0039] Figure 11 This is a structural schematic diagram of the support pad of the present invention from another angle;

[0040] Figure 12 This is a structural diagram of the slotted bushing in use;

[0041] In the figure, 1. forming die base; 101. inner cavity of flanging die; 1011. frustum hole; 1012. cylindrical hole; 102. support accommodating cavity; 103. anti-slip key groove; 104. lower section of die base; 105. upper section of die base; 2. support assembly; 201. base; 2011. seat groove; 202. ejector rod; 2021. rod head; 203. support spring; 204. support pad; 2041. pad hole; 2042. lower pad body; 205. positioning groove; 206. connecting pin; 3. anti-slip rod; 4. bushing. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0043] like Figures 1-11 As shown, a flanging die for a slotted bushing comprises a forming die base 1 and a support assembly 2 disposed in the forming die base 1. The forming die base 1 is provided with a flanging die cavity 101 for forming the bushing 4 and a support accommodating cavity 102 for accommodating the support assembly 2. The flanging die cavity 101 is disposed above the support accommodating cavity 102.

[0044] The support assembly 2 includes a support seat, a support pad 204 and a support spring 203. The support seat includes a base 201 and a top rod 202 arranged on the base 201. The support pad 204 is slidably mounted on the top rod 202. The support spring 203 is mounted on the top rod 202 between the base 201 and the support pad 204. The support pad 204 and the top rod 202 cooperate to form a positioning groove 205 for positioning the lower end of the bushing 4.

[0045] The top end of the push rod 202 is provided with a rod head 2021. The support pad 204 is provided with a pad hole 2041. A limiting shoulder is provided in the pad hole 2041 for limiting the position of the rod head 2021. The diameter of the rod head 2021 is larger than the inner diameter of the limiting shoulder. The rod end of the push rod 202 passes through the pad hole 2041 and is connected to the base 201. The upper end of the support spring 203 acts on the support pad 204. The support pad 204 cooperates with the push rod 202 to form a positioning groove 205 for positioning the bottom end of the bushing 4. The rod head 2021 acts on the limiting shoulder to limit the highest position of the support pad 204.

[0046] The flanging die cavity 101 includes a connected frustum hole 1011 and a cylindrical hole 1012, which are arranged sequentially from top to bottom within the forming die base 1. The wall of the frustum hole 1011 is inclined to serve as the active surface during the forming of the bushing 4, facilitating the flanging of the bushing 4 end. The cylindrical hole 1012 provides support and wrapping for the bushing 4, ensuring its quality during stamping and reducing or even preventing its deformation.

[0047] The forming die base 1 comprises a die base middle section and a die base lower section 104. The outer diameter of the die base lower section 104 is smaller than that of the die base middle section. The lower portion of the forming die base 1, i.e., the die base lower section 104, adopts a small-diameter structural design. An annular groove is formed between the die base lower section 104 and the die base middle section, which can engage with the rotating bayonet on the subsequent automated flanging equipment to drive the flanging die rotation, ensuring the stability of the circumferential rotation feeding of the bushing 4 on the automated bushing flanging equipment, making the flanging die more stable and reliable during the rotation feeding process.

[0048] The forming die base 1 further includes a die base upper section 105, the outer diameter of which is smaller than the outer diameter of the die base middle section, mainly used to reduce weight and prevent the flanging die from tipping over during rotation.

[0049] The support pad 204 includes an upper pad body and a lower pad body 2042. The outer diameter of the upper pad body is larger than the outer diameter of the lower pad body 2042. The base 201 is provided with a seat groove 2011. The lower pad body 2042 can be placed in the seat groove 2011 when the base 201 and the ejector rod 202 move upward to eject the bushing 4. The groove depth of the seat groove 2011 is greater than the height of the lower pad body 2042. During the process of ejecting the bushing 4, the base 201 and the ejector rod 202 move upward, the base 201 compresses the support spring 203, and the lower pad body 2042 can be completely placed in the seat groove 2011. The upper surface of the base 201 can act on the bottom surface of the upper pad body, without causing problems such as tilting, ensuring that the ejector rod 202 can smoothly eject the bushing 4 product.

[0050] The top rod 202 is connected to the base 201 via a connecting mechanism. The connection between the top rod 202 and the base 201 is achieved through the connecting mechanism.

[0051] The connecting mechanism includes a rod pin hole and a connecting pin 206 that can be inserted into the rod pin hole. The base 201 is provided with a positioning hole for installing the push rod 202. The push rod 202 and the base 201 are correspondingly provided with the rod pin holes for the connecting pin 206 to pass through. The lower end of the push rod 202 is placed in the positioning hole, and the connecting pin 206 is inserted from the rod pin hole on the base 201, and then inserted into the rod pin hole on the push rod 202 until it passes through the rod pin hole on the other side of the base 201. The base 201 and the push rod 202 are connected by the connecting pin 206, which is convenient to install. When facing bushing 4 products of different lengths, the push rod 202 is also very convenient to disassemble and replace. The same flanging mold can realize flanging processing of bushing 4 products of various heights.

[0052] The push rod 202 is interference fit with the base 201. The outer diameter of the lower end of the push rod 202 is larger than the diameter of the positioning hole on the base 201. When the push rod 202 is pressed onto the base 201, the push rod 202 and the base 201 are transitionally fitted to ensure the stability of the connection between the two and facilitate the subsequent disassembly and replacement of the push rod 202 at different heights.

[0053] The base 201 is mounted on the forming die base 1 via an anti-slip mechanism. The support assembly 2 is mounted within the forming die base 1. Without the anti-slip mechanism, the support assembly 2 would be separated from the forming die base 1 when the flanging die is picked up, making it inconvenient to remove, transfer, and store the flanging die as a whole. The anti-slip mechanism allows the support assembly 2 to be linked to the forming die base 1 without affecting the flanging die's usability. The support assembly 2 can move relative to the forming die base 1 but will not separate from the forming die base 1, making it convenient to remove, transfer, and store the flanging die as a whole.

[0054] The anti-slip mechanism includes an anti-slip key groove 103 and an anti-slip rod 3 whose outer end can move up and down in the anti-slip key groove 103. The anti-slip key groove 103 is arranged on the forming die base 1, and the inner end of the anti-slip rod 3 is connected to the base 201. The anti-slip key groove 103 is a long through hole and is axially arranged on the forming die base 1. The inner end of the anti-slip rod 3 is inserted into the anti-slip key groove 103 and connected to the base 201 located in the forming die base 1. The outer end of the anti-slip rod 3 can move up and down in the anti-slip key groove 103. By controlling the length of the anti-slip key groove 103, the ejection height is controlled to prevent excessive ejection and interference with the unloading mechanism of the flanging equipment. This not only meets the requirement that the support component 2 will not separate from the forming die base 1, but also controls the up and down movement distance of the base 201 and the ejector rod 202 in the forming die base 1.

[0055] One end of the anti-slip rod 3 is threadedly connected to the base 201, and the other end moves within the anti-slip key slot 103. After the support assembly 2 is installed in the support accommodating cavity 102 in the forming die base 1, the inner end of the anti-slip rod 3 can be inserted from the side anti-slip key slot 103 and threadedly connected to the base 201. The outer end can move up and down in the anti-slip key slot 103 to prevent the support assembly 2 from falling off the forming die base 1.

[0056] When in use, install the flanging mold, specifically install the support component 2 in the support accommodating cavity 102 at the bottom of the forming mold base 1, install the anti-slip rod 3 from the side anti-slip key groove 103 of the forming mold base 1, the rod end of the anti-slip rod 3 is threadedly connected to the base 201, and the support component 2 is associated with the forming mold base 1 through the anti-slip mechanism. The center of the forming mold base 1 is coaxial with the support component 2, and the anti-slip rod 3 can move up and down within the range of the anti-slip key groove 103. The base 201 and the ejector rod 202 can move up and down in the forming mold base 1, thereby achieving positioning and wrapping of the flanging bushing 4 to be flanged or ejecting the flanging bushing 4 product. The frustum hole 1011 of the flanging mold cavity 101 has a certain inclination angle, which is the active surface of the bushing 4 during flanging forming, and the bushing can be made to The sleeve 4 product is stamped and formed to realize the flanging processing of the bushing 4. After the processing is completed, the lifting cylinder of the bushing 4 flanging equipment can act on the support seat to lift the support seat upward, the push rod 202 moves up, the flanging bushing 4 moves up, and the flanging bushing 4 can be separated from the forming die seat 1 to realize the unloading of the flanging bushing 4. As the support seat is lifted and moved upward, the support pad 204 will compress the support spring 203 under the action of the forming die seat 1, which will not hinder the unloading of the flanging bushing 4. After the unloading of the flanging bushing 4 is completed, the lifting cylinder of the bushing 4 flanging equipment is reset, and the support seat is reset under the action of the support spring 203. A positioning groove 205 is formed between the push rod 202 and the support pad 204, waiting for the next bushing 4 to be flanging, which is convenient for the flanging processing of batch products of bushing 4.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flanging die for a slotted bushing, characterized in that: The present invention comprises a forming die base (1) and a support assembly (2) arranged in the forming die base (1), wherein the forming die base (1) is provided with a flanging die inner cavity (101) for forming a bushing (4) and a support accommodating cavity (102) for accommodating the support assembly (2), and the flanging die inner cavity (101) is arranged above the support accommodating cavity (102); The support assembly (2) includes a support seat, a support pad (204) and a support spring (203); the support seat includes a base (201) and a push rod (202) arranged on the base (201); the support pad (204) is slidably mounted on the push rod (202); the support spring (203) is mounted on the push rod (202) between the base (201) and the support pad (204); the support pad (204) and the push rod (202) cooperate to form a positioning groove (205) for positioning the lower end of the bushing (4); The upper end of the push rod (202) is provided with a rod head (2021), the support pad (204) is provided with a pad hole (2041), and a limiting shoulder for limiting the position of the rod head (2021) is provided in the pad hole (2041), and the diameter of the rod head (2021) is larger than the inner diameter of the limiting shoulder; The molding die base (1) comprises a die base middle section and a die base lower section (104), the outer diameter of the die base lower section (104) being smaller than the outer diameter of the die base middle section; the molding die base (1) further comprises a die base upper section (105), the outer diameter of the die base upper section (105) being smaller than the outer diameter of the die base middle section.

2. The flanging die of the slotted bushing according to claim 1, characterized in that: The flanging die inner cavity (101) comprises a connected frustum hole (1011) and a cylindrical hole (1012), and the frustum hole (1011) and the cylindrical hole (1012) are arranged in sequence from top to bottom in the forming die base (1).

3. The flanging die of the slotted bushing according to claim 1 or 2, characterized in that: The support pad (204) comprises an upper pad body and a lower pad body (2042), the outer diameter of the upper pad body is larger than the outer diameter of the lower pad body (2042), a seat groove (2011) is provided on the base (201), and the lower pad body (2042) can be placed in the seat groove (2011) when the support seat moves upward to eject the bushing (4).

4. The flanging die for the slotted bushing according to claim 1 or 2, characterized in that: The top rod (202) is connected to the base (201) via a connecting mechanism.

5. The flanging die for the slotted bushing according to claim 4, characterized in that: The connecting mechanism comprises a rod pin hole and a connecting pin (206) that can be inserted into the rod pin hole. A positioning hole for installing the top rod (202) is provided on the base (201). The top rod (202) and the base (201) are correspondingly provided with the rod pin holes for the connecting pin (206) to pass through.

6. The flanging die for the slotted bushing according to claim 1 or 2, characterized in that: It also includes an anti-slip mechanism, and the base (201) is arranged on the forming die base (1) through the anti-slip mechanism.

7. The flanging die for the slotted bushing according to claim 6, characterized in that: The anti-slip mechanism comprises an anti-slip key groove (103) and an anti-slip rod (3) whose outer end can move up and down in the anti-slip key groove (103); the anti-slip key groove (103) is provided on the forming die base (1); and the inner end of the anti-slip rod (3) is connected to the base (201).

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