Chair leg edge tube machining method and combined chair leg

Abstract

The invention relates to a chair leg edge pipe machining method and a combined chair leg, and relates to the technical field of chair leg machining, and the machining method sequentially comprises a cutting procedure, a forming procedure and a sealing procedure according to the machining sequence; cutting: cutting the first raw material to form a first metal tube, and forming an opening at the tail end of the first metal tube; a forming procedure, specifically, the first metal pipe is subjected to punch forming to form a second metal pipe, the middle of the second metal pipe is provided with a concave groove or a convex groove, the tail end of the second metal pipe is provided with a bent part bent towards the opening direction, and the end, away from the opening, of the second metal pipe is provided with a plurality of connecting holes; and a sealing procedure: stamping the second raw material to form a sealing iron sheet, arranging a mounting block on the lower surface of the sealing iron sheet, and welding the sealing iron sheet with the opening of the second metal tube to form the processed side tube. The swivel chair leg has the effect of improving the pressure bearing capacity of the swivel chair leg.

Description

Technical Field

[0001] The present application relates to the technical field of chair leg processing, and in particular to a chair leg edge tube processing method and a combined chair leg. Background Art

[0002] A swivel chair is a chair whose sitting part can rotate. It is commonly used as a computer chair and office chair. A swivel chair usually connects the chair body and universal wheels through specially structured chair legs to achieve rotation and movement.

[0003] The legs of a swivel chair are usually five-claw structures, including a central tube and five side tubes evenly arranged outside the central tube. The ends of the side tubes usually need to have a certain curvature so that the central tube does not touch the ground, thereby ensuring that the swivel chair can move normally. The side tubes in the prior art are usually spliced, and parts of different shapes are formed separately and then welded together. This forming method requires more parts to be welded, resulting in low processing efficiency and high labor costs. At the same time, the pressure bearing capacity of the spliced ​​legs is weak, resulting in a lower weight that the swivel chair can bear. Summary of the invention

[0004] The purpose of this application is to provide a chair leg edge tube processing method and a combined chair leg to improve the pressure-bearing capacity of the swivel chair leg.

[0005] In the first aspect, the present application provides a chair leg edge tube processing method using the following technical solution: A chair leg edge tube processing method, which includes a cutting process, a forming process and a sealing process in sequence; A cutting step, cutting the first raw material into a first metal tube, wherein the first metal tube has an opening at the end thereof; A forming step, stamping the first metal tube to form a second metal tube, wherein the second metal tube has a groove or a convex groove in the middle, the end of the second metal tube has a bent portion bent toward the opening, and the end of the second metal tube away from the opening has a plurality of connection holes; In the sealing process, the second raw material is punched to form a sealing iron sheet, the lower surface of the sealing iron sheet has a mounting block, and the sealing iron sheet is welded to the opening of the second metal tube to form a processed side tube.

[0006] By adopting the above-mentioned technical scheme, the present application cuts the first metal tube through a cutting process, and stamps the second metal tube of the side tube through a forming process, so that the second metal tube has a bent portion bent in the opening direction, and the straight tube portion and the bent portion are integrally formed, and the side tube is sealed through a sealing process, which simplifies the processing flow of the side tube of the chair leg, improves the processing efficiency of the side tube of the chair leg, and effectively improves the pressure-bearing capacity of the swivel chair leg.

[0007] Furthermore, the cutting process specifically includes the following steps: S11, preparing a first raw material; S12, cutting the end of the first raw material by a cutting device to form an opening, thereby obtaining a first metal tube.

[0008] By adopting the above technical solution, the present application performs a laser cutting process on the first raw material according to the required shape to obtain a first metal tube for subsequent forming, thereby improving processing accuracy and processing efficiency.

[0009] Furthermore, the molding process specifically includes the following steps: S21, punching the middle part of the first metal tube by using a punching device and a groove pressing die to form a groove or a convex groove; S22, stretching the end of the first metal tube toward the opening direction by a stamping device and a stretching die to form a bent portion bent toward the opening direction; S23, punching the end of the first metal tube away from the opening by using a stamping device and a punching die to form a plurality of connecting holes to obtain a second metal tube.

[0010] By adopting the above-mentioned technical solution, the present application stamps the first metal tube through stamping equipment and corresponding molds, and integrally forms the straight tube portion and the curved portion of the first metal tube. Compared with the spliced ​​side tubes, the integrally formed one has higher strength and better pressure resistance, and can effectively improve the pressure-bearing capacity of the swivel chair legs.

[0011] Furthermore, between step S21 and step S22, the following steps are also included: S211, expanding and flanging the opening of the first metal tube by using a stamping device and an expanding die.

[0012] By adopting the above technical solution, the present application performs expansion and flanging at the opening of the first metal tube to adapt to the subsequent sealing iron sheet, thereby ensuring that the sealing process can proceed normally and improving the processing accuracy of the chair legs.

[0013] Furthermore, between step S22 and step S23, the following steps are also included: S221, cutting the excess part of the opening of the first metal tube after stretching by using a stamping device and a cutting die.

[0014] By adopting the above technical solution, since a part of the opening of the first metal tube will protrude after stretching and forming, in order to ensure that the subsequent sealing process can be carried out normally, the present application cuts the excess part of the opening of the first metal tube to improve the processing accuracy of the chair legs.

[0015] Furthermore, the sealing process specifically includes the following steps: S31, preparing the second raw material; S32, stamping the second raw material by a stamping device and a sealing die to obtain a sealing iron sheet that matches the opening shape of the second metal tube; S33, welding the sealing iron sheet to the opening of the second metal tube.

[0016] By adopting the above technical solution, the present application completes the sealing of the second metal tube by stamping the second raw material and welding it to the opening of the second metal tube, thereby obtaining a processed side tube. The side tube of the present application only requires one welding to complete the processing, which simplifies the processing process and improves the processing efficiency.

[0017] Furthermore, between step S32 and step S33, the following steps are also included: S321, riveting a mounting block to the lower surface of the sealing patch, wherein the mounting block is used to mount a universal wheel or an anti-slip foot pad.

[0018] By adopting the above technical solution, the present application rivets the mounting block so that the side tube can be installed with the universal wheel through the mounting block, thereby ensuring the perfect functionality of the side tube.

[0019] Furthermore, it also includes a polishing process after the sealing process; The grinding process uses a grinding device to grind away the burrs and welding slag at the welding point between the second metal tube and the sealing iron sheet.

[0020] By adopting the above technical solution, the present application ensures the smoothness of the side tube surface by grinding the burrs and welding slag at the welding point between the second metal tube and the sealing iron sheet, thereby improving the aesthetics of the side tube, while ensuring that the processed side tube will not have burrs and welding slag that affect subsequent use.

[0021] In the second aspect, the present application provides a combined chair leg adopting the following technical solution: A combined chair leg comprises a central tube and five side tubes, wherein the side tubes are processed by the chair leg side tube processing method described in the first aspect, one end of the side tube is connected to the central tube, and the end of the side tube away from the central tube is used for installing universal wheels or anti-slip foot pads.

[0022] By adopting the above technical solution, the present application forms a combined chair leg by connecting an integrally formed side tube and a center tube, which is used to support a swivel chair and install universal wheels. Compared with the spliced ​​side tubes, the pressure-bearing capacity is stronger, thereby improving the pressure-bearing capacity of the swivel chair legs.

[0023] Furthermore, the central tube includes a central portion and five connecting portions, the central portion is a vertical tube, the five connecting portions are evenly fixed outside the central portion, and the connecting portion is used to insert one end of the side tube and be fixed to the side tube through the connecting hole.

[0024] By adopting the above technical solution, the present application fixedly connects the center tube and the side tubes through the connecting holes, which simplifies the installation process of the center tube and the side tubes, ensures the connection stability, and improves the processing efficiency of the chair legs.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application cuts the first metal tube through a cutting process, and stamps the second metal tube of the side tube through a forming process, so that the second metal tube has a curved portion that bends in the opening direction, and the straight tube portion and the curved portion are integrally formed, and the side tube is sealed through a sealing process, which simplifies the processing flow of the side tube of the chair leg, improves the processing efficiency of the side tube of the chair leg, and effectively improves the pressure bearing capacity of the swivel chair leg; 2. The present application completes the sealing of the second metal tube by stamping the second raw material and welding it with the opening of the second metal tube, thereby obtaining a processed side tube. The side tube of the present application only needs one welding to complete the processing, which simplifies the processing process and improves the processing efficiency; 3. The present application forms a combined chair leg by connecting an integrally formed side tube and a center tube, which is used to support a swivel chair and install universal wheels. Compared with the spliced ​​side tubes, the combined chair leg has a stronger pressure-bearing capacity, thereby improving the pressure-bearing capacity of the swivel chair leg. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the processing method of an embodiment of the present application; Figure 2 is a schematic diagram of the first metal tube structure of an embodiment of the present application; Figure 3 This is a schematic diagram of the side tube structure of an embodiment of the present application; Figure 4 This is a flow chart of the cutting process of an embodiment of the present application; Figure 5 is a flow chart of the molding process of an embodiment of the present application; Figure 6 is a flow chart of the sealing process of an embodiment of the present application; Figure 7 This is a schematic diagram of the combined chair leg structure of an embodiment of the present application; Figure 8 This is a schematic diagram of the central tube structure of an embodiment of the present application; In the figure, 1, first metal tube; 11, opening; 2, second metal tube; 21, groove; 22, bending part; 23, connecting hole; 3, sealing iron sheet; 31, mounting block; 4, side tube; 5, center tube; 51, center part; 52, connecting part. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 -Attached Figure 8, further details of this application are given.

[0028] The legs of a swivel chair usually have a five-claw structure, including a central tube and five side tubes 4 evenly arranged outside the central tube. The ends of the side tubes 4 usually need to have a certain curvature so that the central tube does not touch the ground, thereby ensuring that the swivel chair can move normally. The side tubes in the prior art usually adopt a splicing type, where parts of different shapes are formed separately and then welded together. This forming method requires more parts to be welded, resulting in low processing efficiency and high labor costs. At the same time, the pressure-bearing capacity of the spliced ​​chair legs is weak, resulting in a lower weight that the swivel chair can withstand. Therefore, an embodiment of the present application provides a method for processing the side tubes of chair legs, referring to Figure 1-3 The processing method includes cutting process, forming process, sealing process and polishing process in order, specifically including: S1, a cutting process, cutting the first raw material into a first metal tube 1.

[0029] Specifically, the first metal tube 1 has an opening 11 at the end, and the first raw material is a ladder-shaped tube. After the cutting process, the first metal tube 1 having the opening 11 of a special shape at the end is obtained.

[0030] S2, a forming step, stamping the first metal tube 1 into a second metal tube 2.

[0031] Specifically, the second metal tube 2 has a groove 21 in the middle, a bent portion 22 bent toward the opening 11 at the end, and a plurality of connection holes 23 at the end away from the opening 11. The bent portion 22 is used for subsequent connection to the universal wheel, and the connection holes 23 are used for subsequent connection to the center tube 5.

[0032] S3, a sealing process, punching the second raw material to form a sealing iron sheet 3, welding the sealing iron sheet 3 to the opening 11 of the second metal tube 2, and forming a processed side tube 4.

[0033] Specifically, the shape of the sealing iron sheet 3 is adapted to the opening 11 of the second metal tube 2 , and a mounting block 31 is provided on the lower surface of the sealing iron sheet 3 , and the mounting block 31 is used to mount a universal wheel or an anti-slip foot pad.

[0034] S4, grinding process, grinding the burrs and welding slag at the welding place of the second metal tube 2 and the sealing iron sheet 3 by grinding equipment.

[0035] Specifically, the burrs and welding slag at the welding point between the second metal tube 2 and the sealing iron sheet 3 are polished to ensure the smooth surface of the side tube 4, thereby improving the aesthetics of the side tube 4, and at the same time ensuring that the processed side tube 4 will not have burrs and welding slag to affect subsequent use. The implementation principle of the embodiment of the present application is: the first metal tube 1 is cut through a cutting process, the second metal tube 2 of the side tube 4 is stamped and formed through a forming process, so that the second metal tube 2 has a bent portion 22 bent toward the opening 11, and the straight tube portion and the bent portion 22 are integrally formed, and the side tube 4 is sealed through a sealing process, which simplifies the processing flow of the chair leg side tube 4, improves the processing efficiency of the chair leg side tube 4, and effectively improves the pressure-bearing capacity of the swivel chair leg.

[0036] like Figure 2 and Figure 4 As shown, the cutting process specifically includes the following steps: S11, preparing a first raw material.

[0037] Specifically, the first raw material is a trapezoidal metal tube, and the first raw material is cut to start the cutting process.

[0038] S12, cutting the end of the first raw material by a cutting device to form an opening 11, thereby obtaining a first metal tube 1.

[0039] Specifically, the cutting device can be a laser cutting machine, which cuts the end of the first raw material according to the required shape to form an opening 11 of a special shape, and obtains the first metal tube 1 for subsequent forming. The two sides of the opening 11 of the special shape are bent to adapt to the subsequent stretching and bending part 22. The specific cutting process is automatically performed according to the drawing preset in the cutting device.

[0040] like Figure 3 and Figure 5 As shown, the molding process specifically includes the following steps: S21 , punching the middle portion of the first metal tube 1 by using a punching device and a groove forming die to form a groove 21 .

[0041] Specifically, the groove after stamping can also be a convex groove. According to specific needs, different groove pressing dies are selected for stamping to obtain the groove 21 or the convex groove. The two sides of the groove 21 formed by stamping are smoother, which can make the side tube 4 more beautiful. Stamping processing is a production technology that uses the power of stamping equipment to directly subject the material to deformation force in the mold and deform it, thereby obtaining a product part with a certain shape, size and performance.

[0042] S211, expanding and flanging the opening 11 of the first metal tube 1 by using a stamping device and an expanding die.

[0043] Specifically, the opening 11 of the first metal tube 1 is expanded and flanging is performed to adapt to the subsequent sealing iron sheet 3, so as to ensure that the subsequent sealing process can be carried out normally.

[0044] S22 , stretching the end of the first metal tube 1 toward the opening 11 by means of a stamping device and a stretching die to form a bent portion 22 bent toward the opening 11 .

[0045] Specifically, the end of the first metal tube 1 is stretched downward by stamping to form a bent portion 22, and the straight tube portion and the bent portion 22 of the first metal tube 1 are integrally formed. Compared with the spliced ​​side tube 4, the integrally formed one has higher strength and better pressure resistance.

[0046] S221, cutting the excess part of the opening 11 of the first metal tube 1 after stretching by using a stamping device and a cutting die.

[0047] Specifically, after stretching, a portion of the opening 11 of the first metal tube 1 will protrude. In order to ensure that the subsequent sealing process can proceed normally, the redundant portion of the opening 11 of the first metal tube 1 needs to be cut.

[0048] S23 , punching the end of the first metal tube 1 away from the opening 11 by means of a stamping device and a punching die to form a plurality of connecting holes 23 , thereby obtaining a second metal tube 2 .

[0049] Specifically, the connection hole 23 is obtained by punching in the forming process, and the connection hole 23 is used to connect the central tube 5 during subsequent assembly.

[0050] In the specific implementation process, in the forming process, each step can be stamped using a stamping device with different stamping dies, or it can be implemented by replacing different dies on the same stamping device, depending on the actual situation.

[0051] like Figure 3 and Figure 6 As shown, the sealing process specifically includes the following steps: S31, preparing a second raw material.

[0052] Specifically, the second raw material is an iron sheet with a size matching the opening 11 of the second metal tube 2 .

[0053] S32, stamping the second raw material by means of a stamping device and a sealing die to obtain a sealing iron sheet 3 that matches the shape of the opening 11 of the second metal tube 2.

[0054] Specifically, due to the special shape of the bent portion 22 of the second metal tube 2 , it is necessary to correspondingly stamp and form the sealing iron sheet 3 so that the sealing iron sheet 3 is matched with the shape of the metal tube opening 11 .

[0055] S321, riveting the mounting block 31 to the lower surface of the sealing patch.

[0056] Specifically, the mounting block 31 is used to mount a universal wheel or an anti-skid foot pad, and can be clamped with the universal wheel. The riveting can be performed by a riveting machine, which can rivet the sealing iron sheet 3 and the mounting block 31 with rivets.

[0057] S33 , welding the sealing iron sheet 3 to the opening 11 of the second metal tube 2 .

[0058] Specifically, the sealing iron sheet 3 and the opening 11 of the second metal tube 2 are joined by heating, high temperature or high pressure to obtain the processed side tube 4, so that the side tube 4 of the embodiment of the present application only needs one welding to complete the processing.

[0059] In a preferred embodiment, the processing method of the side tube 4 of the embodiment of the present application may also include an anti-rust treatment process, wherein the burrs and welding slag on the surface of the chair leg are polished by a polishing device, and then the grease and stains on the surface of the side tube 4 are removed, such as performing a pre-plating treatment or a pre-painting treatment on the side tube 4. Then, an anti-rust protective layer is attached to the side tube 4, and the anti-rust protective layer can be formed by electroplating on the surface of the side tube 4, or by a protective coating formed on the surface of the side tube 4 by a powder spraying or painting process.

[0060] like Figure 3 and Figure 7 As shown, the embodiment of the present application also provides a combined chair leg, including a central tube 5 and five side tubes 4, the five side tubes 4 are all processed by a chair leg side tube 4 processing method provided by the embodiment of the present application, one end of the side tube 4 is connected to the central tube 5 through a mounting hole, and the end of the side tube 4 away from the central tube 5 is installed with a universal wheel through a mounting block 31. In the specific implementation process, the combined chair leg of the embodiment of the present application is a five-claw chair leg, and therefore includes five side tubes 4. When a three-claw or multi-claw chair leg is required, multiple side tubes 4 are correspondingly provided to be connected to the central tube 5.

[0061] like Figure 7 and Figure 8 As shown, the central tube 5 includes a central portion 51 and five connecting portions 52. The central portion 51 is a vertical tube. The five connecting portions 52 are evenly fixed to the outside of the central portion 51. The connecting portion 52 is used to insert one end of the side tube 4 and is fixed to the side tube 4 through the connecting hole 23. In the specific implementation process, the five connecting portions 52 are welded to the outside of the central portion 51. The bottom of the five connecting portions 52 is also provided with screw holes corresponding to the positions of the connecting holes 23. The screw holes of the connecting portions 52 and the connecting holes 23 of the side tube 4 are fixed by screws, so that the side tube 4 and the central tube 5 are detachably fixedly connected.

[0062] In the specific implementation process, the processing method of the center tube 5 is as follows: blanking a round tube, chamfering the edge of the round tube, and then punching the round tube to form a taper to obtain the center part 51 of the center tube 5; blanking a square tube, stamping the top of the square tube to form an arc, cutting a screw hole for installing the side tube 4 at the bottom to obtain the connection part 52 of the center tube 5, and finally welding and fixing the center part 51 and the connection part 52 to obtain the completed center tube 5.

[0063] The implementation principle of the embodiment of the present application is: a combined chair leg is formed by connecting an integrally formed side tube 4 and a center tube 5 to support the swivel chair and install universal wheels. Compared with the spliced ​​side tube 4, the pressure-bearing capacity is stronger, thereby improving the pressure-bearing capacity of the swivel chair leg.

[0064] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A chair leg edge tube processing method, characterized in that: The processing sequence includes cutting process, forming process and sealing process; A cutting step, cutting the first raw material into a first metal tube (1), wherein the first metal tube (1) has an opening (11) at the end thereof; A forming step, wherein the first metal tube (1) is stamped to form a second metal tube (2), wherein the second metal tube (2) has a groove (21) or a convex groove in the middle, the end of the second metal tube (2) has a bent portion (22) bent toward the opening (11), and the end of the second metal tube (2) away from the opening (11) has a plurality of connection holes (23); In the sealing step, the second raw material is punched to form a sealing iron sheet (3), the lower surface of the sealing iron sheet (3) is provided with a mounting block (31), and the sealing iron sheet (3) is welded to the opening (11) of the second metal tube (2) to form a processed side tube (4).

2. A chair leg edge tube processing method according to claim 1, characterized in that: The cutting process specifically comprises the following steps: S11, preparing a first raw material; S12, cutting the end of the first raw material by a cutting device to form an opening (11), thereby obtaining a first metal tube (1).

3. A chair leg edge tube processing method according to claim 2, characterized in that: The molding process specifically includes the following steps: S21, punching and forming the middle part of the first metal tube (1) by using a punching device and a groove pressing die to form a groove (21) or a convex groove; S22, stretching the end of the first metal tube (1) toward the opening (11) by means of a stamping device and a stretching die, thereby forming a bent portion (22) that bends toward the opening (11); S23, punching the end of the first metal tube (1) away from the opening (11) by means of a punching device and a punching die to form a plurality of connecting holes (23), thereby obtaining a second metal tube (2).

4. A chair leg edge tube processing method according to claim 3, characterized in that: Between step S21 and step S22, the following steps are also included: S211, expanding and flanging the opening (11) of the first metal tube (1) using a stamping device and an expanding die.

5. A chair leg edge tube processing method according to claim 4, characterized in that: Between step S22 and step S23, the following steps are also included: S221, cutting the excess part of the opening (11) of the first metal tube (1) after stretching by using a stamping device and a cutting die.

6. A chair leg edge tube processing method according to claim 5, characterized in that: The sealing process specifically comprises the following steps: S31, preparing the second raw material; S32, stamping the second raw material by means of a stamping device and a sealing die to obtain a sealing iron sheet (3) that matches the shape of the opening (11) of the second metal tube (2); S33, welding the sealing iron sheet (3) to the opening (11) of the second metal tube (2).

7. A chair leg edge tube processing method according to claim 6, characterized in that: Between step S32 and step S33, the following steps are also included: S321, riveting the mounting block (31) to the lower surface of the sealing patch, wherein the mounting block (31) is used to mount a universal wheel or an anti-slip foot pad.

8. A chair leg edge tube processing method according to any one of claims 1 to 7, characterized in that: It also includes the polishing process after the sealing process; In the grinding process, burrs and welding slags at the welding point between the second metal tube (2) and the sealing iron sheet (3) are ground by means of a grinding device.

9. A combined chair leg, characterized in that: It comprises a central tube (5) and five side tubes (4), wherein the side tubes (4) are processed by a chair leg side tube processing method as described in any one of claims 1 to 8, one end of the side tube (4) is connected to the central tube (5), and the end of the side tube (4) away from the central tube (5) is used for installing a universal wheel or an anti-slip foot pad.

10. The combined chair leg according to claim 9, characterized in that: The central tube (5) comprises a central portion (51) and five connecting portions (52); the central portion (51) is in the shape of a vertical tube; the five connecting portions (52) are evenly fixed outside the central portion (51); the connecting portion (52) is used to be inserted into one end of the side tube (4) and fixed to the side tube (4) through the connecting hole (23).

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