Taper forming method and taper forming die for metal pipe fitting

Abstract

The invention belongs to the technical field of metal piece forming, and discloses a metal pipe fitting taper forming method and a taper forming die. According to the metal pipe fitting taper forming method, before taper forming is conducted on the metal pipe fitting, mechanical roughening treatment is conducted on the outer wall of the metal pipe fitting, saponification treatment is conducted on the metal pipe fitting, the roughness of the outer wall of the metal pipe fitting can be improved through mechanical roughening treatment, and the adhesive force of the outer wall of the metal pipe fitting to saponification powder can be improved; the saponification powder can be smoothly attached to the outer wall of the metal pipe fitting, the friction force between the metal pipe fitting and a mold is reduced, the lubricating performance of the mold of the metal pipe fitting is improved, it can be ensured that the metal pipe fitting cannot adhere to the mold in the subsequent taper forming process, and then the forming effect of the metal pipe fitting is improved; the method is particularly suitable for taper forming of titanium alloy and other metal pipe fittings with high corrosion resistance, the forming effect of the metal pipe fittings is improved, the reject ratio is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal part forming, and particularly to a method for forming the taper of a metal pipe fitting and a taper forming die. Background Art

[0002] With the popularity of the bicycle riding trend and the changing riding environment, different riders have increasingly specialized requirements for bicycles of different materials. Titanium alloy frames have good elasticity and shock absorption performance, can effectively absorb the vibrations and impacts of the road surface, reduce the bumpiness during riding, and can find a perfect balance between comfort and performance when riding on roads such as highways, mountains, and gravel, providing a more comfortable riding experience for riders. At the same time, titanium alloy has the characteristics of being not easily corroded and resistant to extreme high temperatures, making the fatigue strength of titanium alloy frames 5 times higher than that of general aluminum alloy frames, and it will not cause metal fatigue due to stress, with high strength, thus improving the service life of bicycles. Therefore, more and more riders will choose bicycles with titanium alloy frames.

[0003] To meet the above requirements, more and more production enterprises have begun to be committed to the manufacture of titanium alloy frames. However, due to the unique characteristics of titanium alloy pipe fittings such as high strength, high hardness, low plasticity, high elastic modulus, and high temperature sensitivity, these characteristics make their processing extremely difficult. Especially in the styling design of bicycles, due to the difference in the outer diameter sizes of the head tube and the seat tube, titanium alloy pipe fittings usually have a taper shape with a larger front and a smaller rear. When this taper is applied to aluminum alloy pipes, a beveling machine is usually used for processing. However, due to the high strength and high hardness of titanium alloy pipe fittings, cracking generally occurs during beveling, resulting in a low yield rate, not only increasing costs but also affecting production efficiency.

[0004] Therefore, a method for forming the taper of a metal pipe fitting and a taper forming die are needed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for forming the taper of a metal pipe fitting and a taper forming die, which can improve the yield rate during the taper forming process of titanium alloy pipe fittings, reduce cracking, and improve the production efficiency of products.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A method for forming the taper of a metal pipe fitting, the method for forming the taper of a metal pipe fitting includes the following steps:

[0008] S10. Mechanically roughen the outer wall of the metal pipe fitting;

[0009] S20. Saponify the metal pipe fitting;

[0010] S30. Use a taper forming die to process the taper of the metal pipe fitting.

[0011] As an alternative technical solution, the mechanical roughening treatment of the outer wall of the metal pipe fitting specifically includes: using a sandblasting device to sandblast the outer wall of the metal pipe fitting.

[0012] As an alternative technical solution, using a sandblasting device to sandblast the outer wall of the metal pipe fitting specifically includes:

[0013] S11. Put a sandblasting medium into the sandblasting device;

[0014] S12. Put the metal pipe fitting into the sandblasting device;

[0015] S13. Start the sandblasting device and stop after sandblasting the metal pipe fitting for a first preset time.

[0016] As an alternative technical solution, the saponification treatment of the metal pipe fitting specifically includes: placing the metal pipe fitting in a containing container, and placing the containing container in a saponification tank to soak for a second preset time and then taking it out.

[0017] As an alternative technical solution, the taper forming die includes a die body and a taper sleeve die. The die body is provided with a limiting cavity and a sliding cavity that communicate with each other. The taper sleeve die is provided with a taper hole. The taper sleeve die is slidably arranged in the sliding cavity driven by an external driving member; using the taper forming die to process the taper of the metal pipe fitting specifically includes: positioning the end of the metal pipe fitting in the limiting cavity, and the taper sleeve die slides along the sliding cavity towards the direction close to the limiting cavity driven by an external driving member, so that the inner wall of the taper hole extrudes the part of the metal pipe fitting located in the sliding cavity until the taper sleeve die reaches a preset position.

[0018] As an alternative technical solution, the taper forming die further includes a fixing structure. The fixing structure includes a connected fixing seat and a fixing column. The fixing seat is arranged on the side of the die body away from the taper sleeve die. At least part of the fixing column is located in the limiting cavity; positioning the metal pipe fitting in the limiting cavity specifically includes: extending the end of the metal pipe fitting close to the taper sleeve die through the limiting cavity into the limiting cavity, sleeving the metal pipe fitting on the outer periphery of the fixing column, and limiting the end of the metal pipe fitting.

[0019] As an alternative technical solution, the taper forming die further includes a limiting block. The limiting block is arranged in the limiting cavity; the taper sleeve die reaching the preset position specifically means: the taper sleeve die abuts against the limiting block driven by an external driving member.

[0020] The present invention also adopts the following technical solutions:

[0021] A taper forming die, applicable to the taper forming method of the metal pipe fitting as described above, the taper forming die comprising:

[0022] A die body, the die body is provided with a limiting cavity and a sliding cavity communicating with each other, the limiting cavity is used for limiting the metal pipe fitting, and the head end of the metal pipe fitting is located in the sliding cavity;

[0023] A taper sleeve die, the taper sleeve die can be slidably arranged in the sliding cavity along a direction close to or away from the limiting cavity under the drive of an external driving member, the taper sleeve die is provided with a taper hole, the taper hole and the limiting cavity are coaxially arranged, and the inner wall of the taper hole is used for extruding the metal pipe fitting;

[0024] A fixing structure, the fixing structure includes a fixing seat and a fixing column, the fixing seat is arranged on the die body and is located on one side of the limiting cavity away from the sliding cavity, the fixing column is connected with the fixing seat, and at least part of the fixing column is located in the limiting cavity.

[0025] As an optional technical solution, the taper forming die further includes a limiting structure, the limiting structure includes a limiting groove and a limiting protrusion, the limiting groove is opened on the fixing column and extends along the axial direction of the fixing column to the end face of the fixing column close to the sliding cavity, the limiting protrusion protrudes from the inner wall of the limiting cavity, the limiting protrusion and the limiting groove are cooperatively arranged, and the limiting protrusion is used for abutting against the metal pipe fitting.

[0026] As an optional technical solution, the taper forming die further includes a guide post, the guide post is arranged in the sliding cavity, and a guide hole is arranged on the taper sleeve die, and the guide post is slidably arranged in the guide hole.

[0027] Advantages of the present invention:

[0028] The present invention discloses a method for forming the taper of a metal pipe fitting. The method for forming the taper of the metal pipe fitting includes the following steps: mechanically roughening the outer wall of the metal pipe fitting; saponifying the metal pipe fitting; and processing the taper of the metal pipe fitting using a taper forming die. This method for forming the taper of the metal pipe fitting first mechanically roughens the outer wall of the metal pipe fitting and then saponifies it before forming the taper. The mechanical roughening treatment can increase the roughness of the outer wall of the metal pipe fitting, improve the adhesion of the outer wall of the metal pipe fitting to the saponifying powder, ensure that the saponifying powder can smoothly adhere to the outer wall of the metal pipe fitting, reduce the friction between the metal pipe fitting and the die, improve the lubrication performance of the die for the metal pipe fitting, and ensure that the metal pipe fitting will not adhere to the die or the like during the subsequent taper forming process, thereby improving the forming effect of the metal pipe fitting. It is particularly suitable for the taper forming of metal pipe fittings with strong corrosion resistance such as titanium alloy, improving the forming effect of the metal pipe fitting, reducing the defective rate, and improving the production efficiency.

[0029] The present invention also discloses a taper forming die, which is applicable to the above method for forming the taper of a metal pipe fitting. The taper forming die includes a die body, a taper sleeve die, and a fixing structure. The die body is provided with a limiting cavity and a sliding cavity that communicate with each other. The limiting cavity is used to limit the end of the metal pipe fitting, and the head of the metal pipe fitting is located in the sliding cavity. The taper sleeve die is slidably arranged in the sliding cavity. The taper sleeve die is provided with a taper hole that is coaxially arranged with the limiting cavity. The inner wall of the taper hole is used to extrude the metal pipe fitting. The fixing structure includes a fixing seat and a fixing column. The metal pipe fitting can be sleeved on the outer periphery of the fixing column for limiting. This taper forming die limits the end of the metal pipe fitting through the limiting cavity of the die body and the fixing seat of the fixing structure, thereby ensuring the stability of the metal pipe fitting during the taper forming process, improving the forming effect, and performing taper forming by extruding the metal pipe fitting through the taper hole, reducing the problem that the titanium alloy pipe fitting is prone to cracking during the taper forming process, and thus improving the qualified rate. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the taper forming die according to an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of the taper forming die according to an embodiment of the present invention;

[0032] Figure 3 is Figure 2 a partial enlarged view of A in

[0033] Figure 4 is a schematic structural diagram of the taper forming die (with the upper die hidden) according to an embodiment of the present invention;

[0034] Figure 5 is a cross-sectional view of the die body according to an embodiment of the present invention;

[0035] Figure 6 It is a schematic structural diagram of a taper sleeve mold and a connection component according to an embodiment of the present invention;

[0036] Figure 7 It is a cross-sectional view of a taper sleeve mold and a connection component according to an embodiment of the present invention;

[0037] Figure 8 It is a schematic structural diagram of a fixing structure according to an embodiment of the present invention;

[0038] Figure 9 It is a logic diagram of a method for forming a taper of a metal pipe fitting according to an embodiment of the present invention.

[0039] In the figure:

[0040] 1. Taper forming die; 2. Metal pipe fitting;

[0041] 10. Die body; 11. Limiting cavity; 12. Sliding cavity; 13. Upper die; 131. Upper semi-circular arc; 132. Upper groove; 14. Lower die; 141. Lower semi-circular arc; 142. Lower groove;

[0042] 20. Taper sleeve mold; 21. First taper die; 211. Taper hole; 22. Second taper die; 221. Through hole;

[0043] 30. Fixing structure; 31. Fixing seat; 311. Body; 312. Abutting plate; 32. Fixing column;

[0044] 41. Limiting groove; 42. Limiting protrusion;

[0045] 50. Connection component; 51. Connection seat; 52. Support rod. Detailed implementation manners

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0047] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] As Figures 1 to 8 shown, in this embodiment, a taper forming die 1 is provided. The taper forming die 1 includes a die body 10, a taper sleeve die 20 and a fixing structure 30. The die body 10 is provided with a limiting cavity 11 and a sliding cavity 12 that communicate with each other. The limiting cavity 11 is used to limit the end of the metal pipe fitting 2, and the head end of the metal pipe fitting 2 is located in the sliding cavity 12. The taper sleeve die 20 can be slidably arranged in the sliding cavity 12 along the direction close to or away from the limiting cavity 11 driven by an external driving member. The taper sleeve die 20 is provided with a taper hole 211, and the taper hole 211 is coaxially arranged with the limiting cavity 11. The inner wall of the taper hole 211 is used to extrude the metal pipe fitting 2. The fixing structure 30 includes a fixing seat 31 and a fixing column 32. The fixing seat 31 is arranged on the die body 10 and is located on the side of the limiting cavity 11 away from the sliding cavity 12. The fixing column 32 is connected to the fixing seat 31, and at least part of the fixing column 32 is located in the limiting cavity 11.

[0051] Specifically, in this embodiment, as Figure 5As shown, the mold body 10 includes an upper mold 13 and a lower mold 14. The upper mold 13 and the lower mold 14 are movably connected. The upper mold 13 is provided with an upper semi-circular arc 131, and the lower mold 14 is provided with a lower semi-circular arc 141. The upper semi-circular arc 131 and the lower semi-circular arc 141 form a limiting cavity 11 with a circular cross-section. The upper mold 13 is provided with an upper groove 132, and the lower mold 14 is provided with a lower groove 142. The upper groove 132 and the lower groove 142 form a sliding cavity 12 with a rectangular cross-section. The limiting cavity 11 with a circular cross-section can be adapted to the shape of the metal pipe fitting 2, which is convenient for the centering of the metal pipe fitting 2, thereby improving the forming effect of the metal pipe fitting 2. The sliding cavity 12 with a rectangular cross-section can improve the support and guiding effect on the taper sleeve mold 20, thereby ensuring the stability of the movement of the taper sleeve mold 20, and further ensuring the forming effect of the metal pipe fitting 2; the fixed seat 31 of the fixing structure 30 is fixedly connected to the lower mold 14. The fixing column 32 is cylindrical, and the fixing column 32 and the limiting cavity 11 are coaxially arranged, which can ensure that the metal pipe fitting 2 sleeved on the fixing column 32 has a good centering effect, thereby ensuring the forming effect of the metal pipe fitting 2; a taper hole 211 is formed on the taper sleeve mold 20. When the taper sleeve mold 20 moves along the direction close to the limiting cavity 11, the metal pipe fitting 2 will gradually enter the taper hole 211. The inner wall of the taper hole 211 will extrude the metal pipe fitting 2, thereby forming the metal pipe fitting 2 into a preset taper. The taper forming of the metal pipe fitting 2 is carried out by the extrusion direction. Compared with the prior art method of processing with an inclined machine, it is less likely to produce defects such as cracking, thereby effectively ensuring the forming effect of high-strength and high-hardness metal pipe fittings 2 such as titanium alloy pipe fittings.

[0052] Specifically, in this embodiment, the lower mold 14 is fixedly arranged above the machine table. A lifting mechanism is arranged on the top of the machine table. The lifting mechanism is fixedly connected to the upper mold 13 and can drive the upper mold 13 to move along the direction close to or away from the lower mold 14, thereby realizing the opening and closing of the mold body 10. A side push pressure cylinder is arranged on the side of the machine table. The telescopic rod of the side push pressure cylinder is connected to the taper sleeve mold 20. When the telescopic rod expands and contracts, it can drive the taper sleeve mold 20 to move along the direction close to or away from the limiting cavity 11, thereby carrying out taper forming on the metal pipe fitting 2 and being able to normally eject the mold after forming, ensuring that the metal pipe fitting 2 can be normally taken out after forming.

[0053] Specifically, in this embodiment, the fixed seat 31 is tightened to the lower mold 14 by bolts. In other embodiments, it can also be connected to the lower mold 14 by welding or other means, which will not be elaborated here.

[0054] Specifically, in this embodiment, the fixed seat 31 includes a main body 311 and an abutting plate 312. The abutting plate 312 is connected to the main body 311 and is used to abut against the mold body 10. A connecting hole is provided on the main body 311. The fixing column 32 is axially provided with a connecting threaded hole. After the connecting bolt passes through the connecting hole, it is threadedly connected to the connecting threaded hole to detachably connect the fixing column 32 and the main body 311. The abutting plate 312 abuts against the lower mold 14. The arrangement of the abutting plate 312 makes there be a gap between the upper mold 13 and the main body 311, which can avoid mutual interference between the upper mold 13 and the main body 311 during the lifting process, and thus can effectively reduce noises during work and improve the comfort of the working environment. The fixing column 32 and the main body 311 are connected by connecting bolts, which is convenient for replacement in case of damage to the fixing column 32 and can reduce the raw material cost.

[0055] Specifically, in this embodiment, a first through hole and a second through hole are respectively provided on the main body 311 and the abutting plate 312. The first through hole and the second through hole are communicated. A threaded hole is provided on the lower mold 14. After the bolt passes through the first through hole and the second through hole, it is threadedly connected to the threaded hole to connect the fixed seat 31 to the lower mold 14. This connection method not only has good reliability but also is convenient for disassembly and assembly, improving the use convenience.

[0056] In another embodiment, the main body 311 and the abutting plate 312 are connected by welding, and the abutting plate 312 and the lower mold 14 are also connected by welding, which will not be elaborated here.

[0057] Specifically, in this embodiment, as Figure 6 and Figure 7 shown, the tapered mold includes a first tapered mold 21 and a second tapered mold 22. The first tapered mold 21 is provided with the above-mentioned tapered hole 211, and the second tapered mold 22 is provided with a through hole 221. The tapered hole 211 and the through hole 221 are coaxially arranged. The first tapered mold 21 and the second tapered mold 22 are connected by bolts. The tapered hole 211 is used to extrude the metal pipe fitting 2, and the through hole 221 is used to pass through the metal pipe fitting 2.

[0058] Furthermore, as Figure 2 and Figure 4As shown, the taper forming die 1 further includes a limiting structure. The limiting structure includes a limiting groove 41 and a limiting protrusion 42. The limiting groove 41 is formed in the fixed column 32 and extends along the axial direction of the fixed column 32 to the end face of the fixed column 32 close to the sliding cavity 12. The limiting protrusion 42 protrudes from the inner wall of the limiting cavity 11. The limiting protrusion 42 and the limiting groove 41 are arranged in cooperation, and the limiting protrusion 42 is used to abut against the metal pipe fitting 2. Specifically, in this embodiment, the limiting groove 41 extends along the axial direction of the fixed column 32, and the above-mentioned limiting groove 41 is provided on a partial structure of the fixed column 32 along the length direction, and the limiting groove 41 extends along the axial direction of the fixed column 32 to the end face of the fixed column 32 close to the sliding cavity 12. The limiting protrusion 42 protrudes from the inner wall of the limiting cavity 11. After the fixed column 32 extends into the limiting cavity 11, the limiting protrusion 42 is located at the end of the limiting groove 41 away from the sliding cavity 12. This setting can facilitate the extension of the fixed column 32 into the limiting cavity 11 and prevent the limiting protrusion 42 from affecting the normal installation of the fixed column 32. The limiting protrusion 42 and the bottom of the limiting groove 41 are arranged at intervals. During the taper forming process of the metal pipe fitting 2, the limiting protrusion 42 can abut against the metal pipe fitting 2. When the metal pipe fitting 2 is under pressure, the end of the metal pipe fitting 2 will deform, resulting in a part of the structure of the metal pipe fitting 2 entering the gap between the limiting protrusion 42 and the limiting groove 41, thereby clamping the metal pipe fitting 2, which can prevent the removal of the taper sleeve die 20 from being affected and improve the operation efficiency during the taper forming process. The deformed part can be removed by machining after the taper forming is completed.

[0059] Specifically, in this embodiment, as Figure 2 and Figure 3 shown, the limiting structure includes a limiting groove 41 and a limiting protrusion 42. In other embodiments, the limiting structure may include a plurality of limiting grooves 41 and a plurality of limiting protrusions 42. The plurality of limiting grooves 41 are arranged at intervals along the circumferential direction of the fixed column 32, and the plurality of limiting protrusions 42 are arranged at intervals along the circumferential direction of the inner wall of the limiting cavity 11, and the plurality of limiting protrusions 42 and the plurality of limiting grooves 41 are arranged in one-to-one correspondence, which can clamp the metal pipe fitting 2 after the taper forming of the metal pipe fitting 2, thereby facilitating the removal of the taper sleeve die 20 and improving the efficiency of the taper forming of the metal pipe fitting 2.

[0060] Furthermore, the taper forming die 1 further includes a guide post. The guide post is arranged in the sliding cavity 12, and a guide hole is provided on the taper sleeve die 20. The guide post is slidably arranged in the guide hole. Specifically, in this embodiment, the guide post is slidably arranged in the guide hole. During the movement of the taper sleeve die 20, the guide post can have a good guiding effect on the taper sleeve die 20, so that the taper hole 211 of the taper sleeve die 20 can have a good centering effect with the metal pipe fitting 2, thereby improving the taper forming effect of the metal pipe fitting 2 and the yield rate.

[0061] Specifically, in this embodiment, as Figure 2 and Figure 4 shown, the taper forming die 1 further includes a connection assembly 50. The connection assembly 50 includes a connection seat 51 and a support rod 52. The support rod 52 is arranged on the connection seat 51. The support rod 52 is used to connect to the taper sleeve die 20. And a plurality of support rods 52 are provided. The plurality of support rods 52 are respectively arranged on the circumference of the taper hole 211, and are used to improve the stability of the taper sleeve die 20 during the movement process. The connection seat 51 is used to connect the telescopic rod of the side push pressure cylinder to ensure the normal movement of the taper sleeve die 20.

[0062] Specifically, in this embodiment, the taper forming module further includes a limiting block. The limiting block is arranged in the sliding cavity 12. The limiting block is used to abut against the taper sleeve die 20. When the taper sleeve die 20 abuts against the limiting block, it indicates that the taper forming process has been completed. The taper sleeve die 20 can be withdrawn from the die under the drive of the side push pressure cylinder, and then the formed metal pipe fitting 2 can be taken out. This setting can prevent the taper sleeve die 20 from hitting the mold body 10 and improve the safety during use.

[0063] As Figure 9 shown, this embodiment also provides a method for taper forming a metal pipe fitting 2, which is used for taper forming a metal pipe fitting 2 with high hardness and high strength. The method for taper forming the metal pipe fitting 2 includes the following steps.

[0064] S10. Mechanically roughen the outer wall of the metal pipe fitting 2.

[0065] Specifically, in this embodiment, taking the material of the metal pipe fitting 2 to be processed with a taper as titanium alloy as an example, since the friction coefficient between titanium alloy and the mold is relatively large, during the process of taper forming the titanium alloy pipe fitting with the taper sleeve die 20, the titanium alloy pipe fitting and the inner wall of the taper sleeve die 20 are prone to sticking phenomenon, resulting in problems such as poor surface quality or poor dimensional accuracy of the formed titanium alloy workpiece. However, due to the strong corrosion resistance of titanium alloy itself, mechanically roughening the outer wall of the metal pipe fitting 2 can not only overcome the corrosion resistance problem of the titanium alloy pipe fitting compared with the prior art method of using acidic liquid or alkaline liquid to react with the metal pipe fitting 2 to increase the roughness of its outer surface, but also reduce the adverse effects of chemical substances on the metal pipe fitting 2, and has high working efficiency.

[0066] Furthermore, the mechanical roughening treatment of the outer wall of the metal pipe fitting 2 specifically includes the following steps.

[0067] S11. Put the sandblasting medium into the sandblasting device.

[0068] Specifically, in this embodiment, the sandblasting medium is 80# brown fused alumina, whose particle size ranges from 0.18 mm to 0.25 mm. 80# brown fused alumina has high hardness and strong grinding force, with a hardness reaching Mohs 9 level, which can significantly improve the efficiency and quality of sandblasting treatment. Moreover, it is environmentally friendly and safe, and has good economy and durability, and can be reused multiple times, reducing production costs.

[0069] S12. Place the metal pipe fitting 2 into the sandblasting device.

[0070] Specifically, in this embodiment, when placing the metal pipe fitting 2 into the sandblasting device, a fixture needs to be set on the inner wall of the metal pipe fitting 2 to ensure that the outer wall of the metal pipe fitting 2 can be sandblasted, thereby ensuring the sandblasting effect on the outer peripheral wall of the metal pipe fitting 2, making the sandblasting as uniform as possible, and thus improving the forming effect of the workpiece.

[0071] S13. Start the sandblasting device and stop after sandblasting the metal pipe fitting 2 for a first preset time.

[0072] Specifically, in this embodiment, the value range of the first preset time is 30 s - 50 s, such as 32 s, 35 s, 40 s or 50 s, etc., which is not limited here. In actual use, the first preset time can be specifically set according to the diameter size of the metal pipe fitting 2, but it should be ensured that the sandblasting device remains in a stable working state for at least 30 s, so as to ensure the surface sandblasting quality of the metal pipe fitting 2.

[0073] S20. Perform saponification treatment on the metal pipe fitting 2.

[0074] Specifically, in this embodiment, after the mechanical roughening treatment of the metal pipe fitting 2, saponification treatment needs to be carried out on the metal pipe fitting 2. A layer of saponification powder will adhere to the outer peripheral wall of the saponification-treated metal pipe fitting 2. The saponification powder can improve the lubricity of the metal pipe fitting 2, thereby reducing the friction between the metal pipe fitting 2 and the inner wall of the taper sleeve mold 20. Thus, it can not only avoid the sticking mold phenomenon between the metal pipe fitting 2 and the taper sleeve mold 20, but also avoid the difficulty in demolding the taper sleeve mold 20, and thus ensure the forming effect and forming efficiency of the metal pipe fitting 2.

[0075] Further, the saponification treatment of the metal pipe fitting 2 specifically includes: placing the metal pipe fitting 2 in a containing container, and placing the containing container in a saponification tank and soaking it for a second preset time and then taking it out.

[0076] Specifically, in this embodiment, the accommodating container includes a tray and a bracket. The bracket and the floor of the tray are parallel and spaced apart. The bracket is provided with limiting holes, and the metal pipe fitting 2 is inserted into the limiting holes. After placing the accommodating container with the metal pipe fitting 2 in the saponification pool and soaking for a second preset time, it is taken out. The second preset time can satisfy the adhesion of the saponification powder to the outer peripheral wall of the metal pipe fitting 2, thereby improving the taper forming effect of the metal pipe fitting 2.

[0077] Specifically, in this embodiment, the value range of the second preset time is 10 min - 15 min, such as 11 min, 12 min or 13 min, etc., which is not limited here. In actual use, it should be sufficient that the saponification powder adhered to the surface of the metal pipe fitting 2 can play a good lubricating role. The second preset time can be specifically set according to actual use, which is not limited here.

[0078] S30. Use the taper forming die 1 to process the taper of the metal pipe fitting 2.

[0079] The taper forming die 1 includes a die body 10 and a taper sleeve die 20. The die body 10 is provided with a limiting cavity 11 and a sliding cavity 12 that communicate with each other. The taper sleeve die 20 is provided with a taper hole 211, and the taper sleeve die 20 is slidably arranged in the sliding cavity 12 driven by an external driving member. Based on the above taper forming die 1, the processing of the taper of the metal pipe fitting 2 by the taper forming die 1 specifically includes the following content.

[0080] Specifically, in this embodiment, since the die body 10 includes an upper die 13 and a lower die 14, before limiting the metal pipe fitting 2, it is necessary to first start the lifting mechanism to drive the upper die 13 to rise, then position the end of the metal pipe fitting 2 in the limiting cavity 11, and then start the lifting mechanism to drive the upper die 13 to return to its original position. Next, the taper sleeve die 20 slides along the sliding cavity 12 in the direction close to the limiting cavity 11 driven by an external driving member, so that the inner wall of the taper hole 211 squeezes the part of the metal pipe fitting 2 located in the sliding cavity 12 until the taper sleeve die 20 reaches the preset position.

[0081] Specifically, in this embodiment, after positioning the metal pipe fitting 2, the side push pressure cylinder is started. The telescopic rod of the side push pressure cylinder drives the taper sleeve die 20 to move along the direction close to the limiting cavity 11. The metal pipe fitting 2 enters the taper hole 211 of the taper sleeve die 20. As the taper sleeve die 20 moves, the inner wall of the taper hole 211 presses against the metal pipe fitting 2 until the taper sleeve die 20 moves to a preset position, and the taper forming of the metal pipe fitting 2 is completed. Then, the taper sleeve die 20 retracts to the initial position under the drive of the side push pressure cylinder. After that, the lifting mechanism is started to raise the upper die 13, and the taper-formed metal pipe fitting 2 is taken out. If necessary, the taper forming of the next metal pipe fitting 2 is carried out. This taper forming method has a good forming effect, can avoid cracking of the metal pipe fitting 2, etc., and can also have a high working efficiency.

[0082] Furthermore, the taper forming die 1 further includes a fixing structure 30. The fixing structure 30 includes a connected fixing base 31 and a fixing column 32. The fixing base 31 is arranged on the side of the die body 10 away from the taper sleeve die 20, and at least part of the fixing column 32 is located in the limiting cavity 11. Based on the above taper forming die 1, the positioning of the metal pipe fitting 2 in the limiting cavity 11 specifically includes the following content.

[0083] The metal pipe fitting 2 is inserted into the limiting cavity 11 through the end of the limiting cavity 11 close to the taper sleeve die 20. The metal pipe fitting 2 is sleeved on the outer periphery of the fixing column 32, and the end of the metal pipe fitting 2 is limited.

[0084] Specifically, in this embodiment, since part of the fixing column 32 of the fixing structure 30 is located in the limiting cavity 11, sleeving the end of the metal pipe fitting 2 on the circumference of the fixing column 32 can provide certain support and limitation to the metal pipe fitting 2, thereby effectively improving the taper forming effect of the metal pipe fitting 2.

[0085] Furthermore, the taper forming die 1 further includes a limiting block, and the limiting block is arranged in the limiting cavity 11. Based on the above taper forming die 1, the taper sleeve die 20 reaching the preset position specifically means that the taper sleeve die 20 abuts against the limiting block under the drive of an external driving member.

[0086] Specifically, in this embodiment, the side push pressure cylinder pushes the taper sleeve die 20 to move until the taper sleeve die 20 abuts against the limiting block. This setting can increase the consistency of the products after taper forming, thereby improving the yield of the products.

[0087] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A method for forming the taper of a metal pipe fitting, characterized in that The method for forming the taper of the metal pipe fitting includes the following steps: S10. Mechanically roughen the outer wall of the metal pipe fitting (2); S20. Saponify the metal pipe fitting (2); S30. Use a taper forming die to process the taper of the metal pipe fitting (2).

2. The taper forming method of the metal pipe fitting according to claim 1, wherein Specifically, the mechanical roughening of the outer wall of the metal pipe fitting (2) includes: Use a sandblasting device to sandblast the outer wall of the metal pipe fitting (2).

3. The taper forming method of the metal pipe fitting according to claim 2, characterized in that Specifically, using a sandblasting device to sandblast the outer wall of the metal pipe fitting (2) includes: S11. Put a sandblasting medium into the sandblasting device; S12. Put the metal pipe fitting (2) into the sandblasting device; S13. Start the sandblasting device, and stop sandblasting the metal pipe fitting (2) after a first preset time.

4. The method for forming the taper of a metal pipe fitting according to claim 1, wherein Specifically, the saponification treatment of the metal pipe fitting (2) includes: Place the metal pipe fitting (2) in a containing container, and place the containing container in a saponification tank to soak for a second preset time and then take it out.

5. The taper forming method of the metal pipe fitting according to claim 1, wherein, The taper forming die includes a die body (10) and a taper sleeve die (20). The die body (10) is provided with a limiting cavity (11) and a sliding cavity (12) that communicate with each other. The taper sleeve die (20) is provided with a taper hole (211). The taper sleeve die (20) is slidably arranged in the sliding cavity (12) driven by an external driving member; Specifically, using a taper forming die to process the taper of the metal pipe fitting (2) includes: Position the end of the metal pipe fitting (2) in the limiting cavity (11). The taper sleeve die (20) slides along the sliding cavity (12) in the direction close to the limiting cavity (11) driven by an external driving member, so that the inner wall of the taper hole (211) squeezes the part of the metal pipe fitting (2) located in the sliding cavity (12) until the taper sleeve die (20) reaches a preset position.

6. The method for forming the taper of a metal pipe fitting according to claim 5, characterized in that, The taper forming die further includes a fixing structure (30). The fixing structure (30) includes a fixed seat (31) and a fixing column (32) connected to each other. The fixed seat (31) is arranged on the side of the die body (10) away from the taper sleeve die (20). At least part of the fixing column (32) is located in the limiting cavity (11); Specifically, positioning the metal pipe fitting (2) in the limiting cavity (11) includes: Insert one end of the metal pipe fitting (2) close to the taper sleeve die (20) into the limiting cavity (11) through the limiting cavity (11), sleeved the metal pipe fitting (2) on the outer periphery of the fixing column (32), and limit the end of the metal pipe fitting (2).

7. The taper forming method of the metal pipe fitting according to claim 5, characterized in that, The taper forming die further includes a limiting block arranged in the limiting cavity (11); The taper sleeve die (20) reaching the preset position specifically means: The taper sleeve die (20) abuts against the limiting block driven by an external driving member.

8. A taper forming die, applicable to the metal pipe fitting taper forming method according to any one of claims 1-7, characterized in that, The taper forming die includes: Mold body (10), a limiting cavity (11) and a sliding cavity (12) communicating with each other are formed in the mold body (10), the limiting cavity (11) is used to limit the metal pipe fitting (2), and the head end of the metal pipe fitting (2) is located in the sliding cavity (12); Taper sleeve mold (20), the taper sleeve mold (20) can be slidably arranged in the sliding cavity (12) along the direction close to or away from the limiting cavity (11) driven by an external driving member, a taper hole (211) is formed in the taper sleeve mold (20), the taper hole (211) and the limiting cavity (11) are coaxially arranged, and the inner wall of the taper hole (211) is used to extrude the metal pipe fitting (2); Fixing structure (30), the fixing structure (30) includes a fixing base (31) and a fixing column (32), the fixing base (31) is arranged on the mold body (10) and is located on the side of the limiting cavity (11) away from the sliding cavity (12), the fixing column (32) is connected to the fixing base (31), and at least part of the fixing column (32) is located in the limiting cavity (11).

9. The taper forming die according to claim 8, wherein, The taper forming mold further includes a limiting structure, the limiting structure includes a limiting groove (41) and a limiting protrusion (42), the limiting groove (41) is formed in the fixing column (32), the limiting groove (41) extends along the axial direction of the fixing column (32) to the end face of the fixing column (32) close to the sliding cavity (12), the limiting protrusion (42) protrudes from the inner wall of the limiting cavity (11), the limiting protrusion (42) and the limiting groove (41) are cooperatively arranged, and the limiting protrusion (42) is used to abut against the metal pipe fitting (2).

10. The taper forming die according to claim 8, characterized in that, The taper forming mold further includes a guide post, the guide post is arranged in the sliding cavity (12), a guide hole is arranged on the taper sleeve mold (20), and the guide post is slidably arranged in the guide hole.

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