A molding process for one-piece chair legs

Abstract

A forming process for integrally forming chair legs, including a sheet material cutting process and a stamping forming process arranged in sequence; the sheet material cutting process, in which a sheet metal sheet is processed and cut by a sheet material cutting device to produce a first metal plate; the stamping forming process, the stamping forming process includes a chair leg stamping forming process, in which a stamping device is used to stamp and bend the first metal plate, and the first metal plate is stamped and bent to form a chair leg body, the chair leg body is composed of a fixed seat, a plurality of legs distributed on the outer periphery of the fixed seat, and an arc-shaped closing portion bent downward at the end of the leg, and the fixed seat, the plurality of legs and the arc-shaped closing portion are integrally formed. The present invention adopts an integral stamping forming process of stamping and bending a first metal plate to form a fixed seat and a plurality of legs, and has the advantages of high production efficiency, good production quality, low production cost, strong stability of the chair leg structure, etc., and is suitable for wide promotion.

Description

Technical Field

[0001] The invention relates to the technical field of chairs, and in particular to a molding process for integrally molding chair legs. Background Art

[0002] A swivel chair is a chair that allows office workers to move and rotate in a small range while working in the chair, which brings great convenience.

[0003] like Figure 8 As shown, the existing swivel chair generally includes a seat 1' and a leg, wherein the leg includes a mounting ring 2' and a plurality of legs 3' evenly distributed on the periphery of the mounting ring 2', the legs 3' are welded and fixed to the mounting ring 2', and the lower end of the gas rod or shaft rod 4' of the seat 1' is inserted into the hole of the mounting ring 2', thereby completing the connection between the seat 1' and the leg of the swivel chair. During production, since the support leg 3' and the mounting ring 2' are connected by welding, after the chair legs are welded, in order to ensure the beauty of the chair legs, it is usually necessary to manually polish the welding position of the support leg 3' and the mounting ring 2' to facilitate painting or electroplating, and then the surface of the mounting ring 2' is covered with a decorative cover 5', and the decorative cover 5' covers the mounting ring 2' and the connection between it and the support leg 3' as a whole to cover the weld at the connection between the mounting ring 2' and the bracket.

[0004] However, this method requires a lot of labor intensity when grinding the welding position, and the production efficiency is low. In addition, it is easy to grind too much during the grinding process, resulting in desoldering and cracking between the support leg 3' and the mounting ring 2', and the quality of the chair leg production is poor. In addition, the method of setting the decorative cover 5' also increases the production cost to a certain extent, which is not conducive to cost control. Therefore, in order to solve the technical problems caused by welding the support leg, this case proposes a molding process for producing an integrally molded chair leg. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a molding process for integrally molding a chair leg.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A molding process for integrally molding chair legs, characterized by comprising a plate cutting process and a stamping process arranged in sequence;

[0008] A sheet material cutting process is to process and cut the metal sheet by a sheet material cutting device to produce a first metal sheet;

[0009] The stamping and forming process includes a chair leg stamping and forming process, in which a stamping device is used to stamp and bend a first metal plate, and a chair leg body is formed after the first metal plate is stamped and bent. The chair leg body is composed of a fixed seat, a plurality of legs distributed on the outer periphery of the fixed seat, and an arc-shaped closing portion bent downward at the end of the legs. The fixed seat, the plurality of legs and the arc-shaped closing portion are integrally formed.

[0010] In the present invention, the first metal plate includes a fixed main board, a plurality of fixed folded edges extending circumferentially outward from the fixed main board, a plurality of fixed extension plates extending circumferentially outward from the fixed main board, a first folded edge integrally connected to the side edge of the fixed extension plate, and a closing extension plate integrally connected to the end of the fixed extension plate, and the two ends of the fixed folded edge are respectively connected to two circumferentially adjacent fixed extension plates.

[0011] In the present invention, the chair leg stamping process specifically includes the following steps:

[0012] Step 1, preliminarily stamping the first metal plate by a stamping device to form a chair foot body, wherein a plurality of fixed folded edges are bent relative to a fixed main board, and the fixed main board and the plurality of fixed folded edges form a fixed seat; the two side edges of the fixed extension plate are relatively bent to form a leg; the closing extension plate is bent downward in a direction away from the fixed seat, and the two side edges of the closing extension plate parallel to the length direction of the fixed extension plate are relatively bent to form an arc-shaped closing portion;

[0013] Step 2, punching and cutting the excess edges of the chair foot body by punching equipment;

[0014] Step 3, stamping and trimming the outer contour of the seat foot body by a stamping device, the purpose of which is to trim the edges of the fixed folded edge and the first folded edge that are bent outward to a vertical setting;

[0015] Step 4, performing preliminary stamping and folding of the seat foot body by a stamping device, the purpose of which is to press and bend the first folded edge inward to an inclined setting;

[0016] Step 5, the chair foot body is finally stamped and folded after the preliminary stamping and folding by stamping equipment, the purpose is to bend the first folded edge inward to form a first reinforcing rib located below the bending groove of the support foot to obtain the final chair foot body finished product.

[0017] The present invention also includes a fitting welding process after the stamping process;

[0018] In the accessory welding process, a connecting seat is welded on the finished chair foot body to obtain a chair foot, the connecting seat is located in the bending groove of the fixing seat, and the connecting seat is provided with a center hole exposed from the top surface of the fixing seat.

[0019] In the present invention, in the accessory welding process, a roller seat and / or a reinforced support are also welded to the finished chair foot body; the roller seat is located in the bending groove of the arc-shaped closing portion; the reinforced support is located in the bending groove of the fixed seat, the reinforced support is sleeved outside the connecting seat, and the reinforced support is respectively welded to the fixed seat and the connecting seat.

[0020] The present invention further includes a rust prevention treatment process after the accessory welding process;

[0021] In the anti-rust treatment process, grinding equipment is used to grind away burrs and welding slag on the chair legs, and then an anti-rust protective layer is attached to the chair legs to obtain the finished chair legs.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention uses the same first metal plate to simultaneously stamp and bend the fixing seat and the plurality of legs, so that the fixing seat and the plurality of legs are integrally formed, thereby avoiding the disadvantages of welding the legs, effectively improving the production efficiency and quality of the chair legs, and achieving the purpose of reducing the production cost of the chair legs;

[0024] 2. The fixed seat and multiple legs are integrally formed, so there will be no desoldering or cracking between the fixed seat and the multiple legs, which effectively improves the structural stability of the chair legs;

[0025] 3. The connecting seat, roller seat and other accessories are welded in the bending grooves of the fixed seat and the arc-shaped closing part respectively. The welds of the connecting seat and the roller seat are all in the bending grooves, which effectively reduces the impact of the connecting seat, roller seat and other accessories on the quality of the outer surface of the chair legs after welding, thereby reducing the number of places on the chair legs that need to be polished;

[0026] 4. A reinforcing support is provided in the bending groove of the fixing seat, and the reinforcing support is welded to the fixing seat and the connecting seat respectively, which can improve the structural stability of the connecting seat. The reinforcing support is also located in the bending groove of the fixing seat, so it can also reduce the position of the chair legs that need to be polished.

[0027] In summary, the present invention adopts an integrated stamping and forming process of stamping and bending a first metal plate to form a fixed seat and multiple legs, which has the advantages of high production efficiency, good production quality, low production cost, and strong stability of the chair leg structure, and is suitable for wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 The three-dimensional Figure 1 ;

[0030] Figure 2is a schematic diagram of the first metal plate after being bent into a preliminary shape;

[0031] Figure 3 It is a schematic diagram of the changes in each step of the chair leg stamping process;

[0032] Figure 4 The three-dimensional Figure 2 ;

[0033] Figure 5 Schematic diagram of the internal structure of this embodiment;

[0034] Figure 6 is a schematic diagram of a second metal plate;

[0035] Figure 7 The structural diagram of the reinforced support is shown below;

[0036] Figure 8 It is a structural schematic diagram of an existing swivel chair. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Reference Figure 1-7 , a molding process for an integrally molded chair leg, comprising a plate cutting process, a stamping process, a fitting welding process, and an anti-rust treatment process arranged in sequence;

[0039] The sheet material cutting process is to process and cut the metal sheet by the sheet material cutting equipment to produce the first metal sheet and the second metal sheet. In this embodiment, the sheet material cutting process specifically includes the following steps:

[0040] Step 1, placing a metal sheet in a processing area of ​​a sheet material cutting device, wherein the sheet material cutting device may be a laser cutting device;

[0041] Step 2, start the sheet material cutting equipment, and let the sheet material cutting equipment cut the first metal plate and the second metal plate from the metal sheet according to the drawing.

[0042] The first metal plate includes a fixed main plate 101, a plurality of fixed folded edges 102 extending outwardly from the fixed main plate 101 in the circumferential direction and bendable relative to the fixed main plate 101, a plurality of fixed extension plates 103 extending outwardly from the fixed main plate 101 in the circumferential direction and having two sides that can be relatively bent to form legs 2, a first folded edge 104 integrally connected to the side of the fixed extension plate 103 that can be bent into a first reinforcing rib 5, and a closing extension plate 105 integrally connected to the end of the fixed extension plate 103 that can be bent into an arc-shaped closing portion 3, the first through hole 100 is provided on the fixed main plate 101, the two ends of the fixed folded edge 102 are respectively connected to two circumferentially adjacent fixed extension plates 103, and the bent fixed folded edge 102 and the fixed main plate 101 form a fixed seat 1;

[0043] The second metal plate includes a reinforced main board 201, a plurality of branch extension plates 202 extending outward from the periphery of the reinforced main board 201, and a plurality of second folded edges 203 that can be bent relative to the reinforced main board 201 and the branch extension plates 202. The number of the branch extension plates 202 and the second folded edges 203 is the same, and the second folded edges 203 are arranged in a "U" shape. Each second folded edge 203 simultaneously connects the reinforced main board 201 and one side of two adjacent branch extension plates 202. In addition, it should be specifically noted that the first metal plate and the second metal plate can be opened from the same metal plate or from different metal plates. Specifically, the setting can be selected during production according to the layout method of the first metal plate and the second metal plate during laser cutting.

[0044] The stamping forming process includes a chair leg stamping forming process and a support stamping forming process. The chair leg stamping forming process uses a stamping equipment to stamp and bend the first metal plate. The first metal plate is stamped and bent to form a chair leg body. The chair leg body is composed of a fixed seat 1, a plurality of support legs 2 distributed on the outer periphery of the fixed seat 1, and an arc-shaped closing portion 3 bent downward at the end of the support leg 2. The fixed seat 1, the plurality of support legs 2 and the arc-shaped closing portion 3 are integrally formed.

[0045] In this embodiment, the chair leg stamping process specifically includes the following steps:

[0046] Step 1, a first metal plate is preliminarily stamped by a stamping device to form a chair foot body, wherein a plurality of fixed folded edges 102 are bent relative to a fixed main board 101, and the fixed main board 101 and the plurality of fixed folded edges 102 form a fixed seat 1; the two side edges of the fixed extension plate 103 are relatively bent to form a leg 2 with a cross-sectional shape of "∩"; the closing extension plate 105 is bent downward in a direction away from the fixed seat 1, and the closing extension plate 105 is relatively bent parallel to the two side edges of the length direction of the fixed extension plate 103 to form an arc-shaped closing portion 3;

[0047] Step 2, since the first metal plate is deformed and the tensile deformation of the plate increases when the first metal plate is initially stamped to form the chair foot body, in this step, the excess edges of the chair foot body are stamped and cut by a stamping device, and the stamping and cutting positions include the edges of the fixed hem 102 and the first hem 104 and the middle position of the fixed main board 101, wherein the edges of the fixed hem 102 and the first hem 104 are stamped and cut to remove the excess edges of the fixed hem 102 and the first hem 104, and the middle position of the fixed main board 101 is stamped and cut to form a first through hole;

[0048] Step 3, stamping and trimming the outer contour of the seat foot body by a stamping device, the purpose of which is to trim the outwardly bent edges of the fixed folded edge 102 and the first folded edge 104 to a vertical setting, wherein the stamping and trimming of the fixed folded edge 102 is to avoid the outer periphery of the fixed seat 1 having an outward convex edge to ensure the beauty of the fixed folded edge; the stamping and trimming of the first folded edge 104 is to facilitate the first folded edge 104 to bend inward in the next step;

[0049] Step 4, the seat foot body is preliminarily stamped and folded by a stamping device, the purpose of which is to press the first folded edge 104 inwardly into an inclined setting, so as to facilitate the gradual bending and deformation of the first folded edge 104;

[0050] Step 5, the chair foot body is finally stamped and folded by stamping equipment after the preliminary stamping and folding, the purpose is to bend the first folded edge 104 inward to be horizontally set to form a first reinforcing rib 5 located below the bending groove of the support leg 2, so as to obtain the final finished chair foot body; the first reinforcing rib 5 is located below the bending groove of the support leg 2, so that the first reinforcing rib 5 does not protrude outward to avoid affecting the appearance of the chair leg, and the first reinforcing rib 5 is used to enhance the structural strength of the support leg 2 and improve stability.

[0051] The support stamping and forming process is used to stamp and bend the second metal plate to form a reinforced support 7 after stamping and bending, wherein the second folded edge 203 connects the part of the reinforced main board 201 and forms a reinforced bracket 71 of the reinforced support 7 with the reinforced main board 201, and the second folded edge 203 connects the part of the branch extension plate 202 and forms a reinforced support arm 72 of the reinforced support 7 with the branch extension plate 202.

[0052] In addition, in the process of stamping the chair legs, each step can be performed by using stamping equipment with different stamping dies, or by replacing different stamping dies on the same stamping equipment, depending on actual conditions.

[0053] In the accessories welding process, the connecting seat 4, the roller seat 6 and the reinforcing support 7 are welded on the finished chair foot body to obtain the chair foot, wherein the connecting seat 4 is located in the bending groove of the fixed seat 1, and the connecting seat 4 is provided with a center hole 41 exposed from the top surface of the fixed seat 1; the roller seat 6 is located in the bending groove of the arc-shaped closing portion 3; the reinforcing support 7 is located in the bending groove of the fixed seat 1, and the reinforcing support 7 is sleeved outside the connecting seat 4, and the reinforcing support 7 is welded to the fixed seat 1 and the connecting seat 4 respectively. In addition, it should be specially noted that during the welding process, the connecting seat 4, the roller seat 6 and the reinforcing support 7 can be in no particular order, and the connecting seat 4, the roller seat 6 and the reinforcing support 7 only need to be welded to the chair foot body.

[0054] In the rust prevention treatment process, the burrs and welding slag on the surface of the chair legs are polished by a polishing device, and then the grease and stains on the surface of the chair legs are removed, such as the chair legs are pre-treated by electroplating or pre-painting; then an anti-rust protective layer is attached to the chair legs to obtain a finished chair leg. The anti-rust protective layer can be an electroplating layer formed on the surface of the chair legs by electroplating, or a protective coating formed on the surface of the chair legs by powder spraying or painting. In this embodiment, it is preferred to pre-treat the chair legs by electroplating, and then form an electroplating layer on the surface of the chair legs by electroplating.

[0055] Reference Figure 1-7 The present embodiment also provides an integrally formed chair leg produced by the above-mentioned forming process, the chair leg comprising a chair leg body, the chair leg body consisting of a fixed seat 1 and a plurality of legs 2 formed by integrally stamping and bending the same first metal plate, the plurality of legs 2 being distributed on the outer periphery of the fixed seat 1, the leg 2 having an arc-shaped closing portion 3 bent at one end away from the fixed seat 1, the cross-sectional shape of the arc-shaped closing portion 3 being a "∩" shape, the arc-shaped closing portion 3 being used to cover the gap at one end of the leg 2 away from the fixed seat 1, thereby achieving the purpose of improving the beauty of the chair leg body.

[0056] Furthermore, the interior of the fixing seat 1, the supporting leg 2 and the arc-shaped closing portion 3 are all bent grooves with openings at the bottom, and a connecting seat 4 is provided in the bent groove of the fixing seat 1. The connecting seat 4 is provided with a center hole 41 exposed from the top surface of the fixing seat 1, and the connecting seat 4 is connected to the fixing seat 1 by welding. The connecting seat 4 is used to install the seat of the swivel chair, and the lower end of the gas rod or shaft rod of the seat is inserted into the center hole 41 of the connecting seat 4, thereby completing the connection between the seat of the swivel chair and the chair leg.

[0057] Furthermore, the roller seat 6 is connected to the arc-shaped closing portion 3 or / the first reinforcing rib 5 by welding, and a connecting hole is provided at the bottom of the roller seat 6, and the bolt of the rolling pulley can be threadedly connected in the connecting hole, thereby realizing the connection between the rolling pulley and the roller seat 6.

[0058] As a preferred embodiment, the fixing seat 1 is provided with a first through hole 100 from top to bottom, and the connecting seat 4 is tubular, and the connecting seat 4 is inserted into the first through hole 100 .

[0059] As a preferred embodiment, the reinforcing support 7 is used to enhance the structural stability between the fixing seat 1 and the connecting seat 4. The reinforcing support 7 includes a reinforcing bracket 71 and a plurality of reinforcing arms 72 formed by bending the same second metal plate as a whole, wherein the reinforcing bracket 71 is sleeved outside the connecting seat 4 and connected to the connecting seat 4; and the plurality of reinforcing arms 72 are evenly distributed on the outer circumference of the reinforcing bracket 71 and connected to the inner wall of the fixing seat 1.

[0060] In this embodiment, a second through hole 73 is provided in the middle of the reinforcing bracket 71, and the connecting seat 4 passes through the second through hole 73. The reinforcing bracket 71 and the connecting seat 4 are fixedly connected by welding, so that the reinforcing bracket 71 improves the structural stability of the connecting seat 4. Furthermore, a reinforcing extension plate 204 is provided on the second folded edge 203, and the reinforcing extension plate 204 is located on the reinforcing support arm 72. The second folded edge 203 and the reinforcing extension plate 204 are both welded to the inner wall of the bending groove of the fixing seat 1, so as to achieve the purpose of enhancing the connection stability.

[0061] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means belongs to the protection scope of the present invention.

Claims

1. A molding process for an integrally molded chair leg, characterized in that: It includes the sheet material cutting process and the stamping process arranged in sequence; A sheet material cutting process is to process and cut the metal sheet by a sheet material cutting device to produce a first metal sheet; A stamping and forming process, the stamping and forming process includes a chair leg stamping and forming process, wherein a stamping device is used to stamp and bend a first metal plate, and the first metal plate is stamped and bent to form a chair leg body, wherein the chair leg body is composed of a fixed seat (1), a plurality of legs (2) distributed on the periphery of the fixed seat (1), and an arc-shaped closing portion (3) bent downward at the end of the legs (2), wherein the fixed seat (1), the plurality of legs (2) and the arc-shaped closing portion (3) are integrally formed; The first metal plate comprises a fixed main plate (101), a plurality of fixed folded edges (102) extending outwardly from the fixed main plate (101) in a circumferential direction, a plurality of fixed extension plates (103) extending outwardly from the fixed main plate (101) in a circumferential direction, a first folded edge (104) integrally connected to the side of the fixed extension plate (103), and a closing extension plate (105) integrally connected to the end of the fixed extension plate (103), wherein the two ends of the fixed folded edge (102) are respectively connected to two circumferentially adjacent fixed extension plates (103); The chair leg stamping process specifically includes the following steps: Step 1, preliminarily stamping the first metal plate by a stamping device to form a chair foot body; Step 2, punching and cutting the excess edges of the chair foot body by punching equipment; Step 3, stamping and trimming the outer contour of the seat foot body by a stamping device; Step 4, using a stamping device to perform preliminary stamping and folding on the seat foot body; Step 5, performing final stamping and folding on the chair foot body after preliminary stamping and folding by means of stamping equipment.

2. The molding process of the one-piece chair leg according to claim 1, characterized in that: In step 1, a first metal plate is preliminarily stamped by a stamping device to form a chair foot body, wherein a plurality of fixed folded edges (102) are bent relative to a fixed main board (101), and the fixed main board (101) and the plurality of fixed folded edges (102) form a fixed seat (1); two side edges of the fixed extension plate (103) are bent relative to each other to form a support leg (2); the closing extension plate (105) is bent downward in a direction away from the fixed seat (1), and two side edges of the closing extension plate (105) parallel to the length direction of the fixed extension plate (103) are bent relative to each other to form an arc-shaped closing portion (3); The purpose of step 3 is to trim the outwardly bent edges of the fixed folded edge (102) and the first folded edge (104) to be vertically arranged; The purpose of step 4 is to bend the first folded edge (104) inwardly to an inclined position; The purpose of step 5 is to bend the first folded edge (104) inwardly to form a first reinforcing rib (5) which is horizontally arranged and located below the bending groove of the support leg (2), thereby obtaining a final finished chair leg body.

3. The molding process of the one-piece chair leg according to claim 1, characterized in that: It also includes the accessory welding process located after the stamping and forming process; In the accessory welding step, a connecting seat (4) is welded on the finished chair foot body to obtain a chair foot, wherein the connecting seat (4) is located in the bending groove of the fixing seat (1), and the connecting seat (4) is provided with a center hole (41) exposed from the top surface of the fixing seat (1).

4. The molding process of the one-piece chair leg according to claim 3, characterized in that: In the accessory welding process, a roller seat (6) and / or a reinforcing support seat (7) are also welded to the finished seat foot body; the roller seat (6) is located in the bending groove of the arc-shaped closing portion (3); the reinforcing support seat (7) is located in the bending groove of the fixed seat (1), the reinforcing support seat (7) is sleeved outside the connecting seat (4), and the reinforcing support seat (7) is welded to the fixed seat (1) and the connecting seat (4) respectively.

5. The molding process of the one-piece chair leg according to claim 3, characterized in that: It also includes the anti-rust treatment process after the accessories welding process; In the anti-rust treatment process, grinding equipment is used to grind away burrs and welding slag on the chair legs, and then an anti-rust protective layer is attached to the chair legs to obtain the finished chair legs.

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