Manufacturing method of metal pipe profile

Abstract

The invention discloses a manufacturing method of a metal pipe sectional material, and relates to the technical field of sectional material machining. Comprising a wall surface groove nesting doll type profile group profile and a manufacturing method thereof. After base material acid pickling and phosphating treatment, base material heading, head rolling and cold drawing forming, annealing for residual stress elimination, size design derivation of the sleeve-doll-type profile set and assembly hole forming process treatment of the profile, the sleeve-doll-type profile set which is provided with a groove in the wall face, attractive in appearance, high in strength, stable in size, smooth and clean in surface, resistant to abrasion and corrosion can be obtained. And the requirements of the sectional material in different application scenes can be met through transverse, longitudinal, columnar and doll type connection. The screw head can be embedded in the groove, the sleeve doll type structure greatly facilitates self combination and connection with other parts, many traditional products formed through welding and polishing can be changed into a detachable mode, the packaging size is greatly reduced, the storage and transportation cost is greatly reduced, and the health of workers is protected; and meanwhile, a solution is provided for manufacturing super-long and super-wide products.

Description

Technical Field

[0001] The invention relates to the technical field of profile processing, in particular to a method for manufacturing a metal tube profile. Background Art

[0002] Profiles are objects with certain geometric shapes made of steel or nonferrous metals and materials with certain strength and toughness through rolling, extrusion, casting and other processes. This type of material has certain appearance dimensions, certain cross-section shapes, and certain mechanical and physical properties. Profiles can be used alone or further processed into other manufactured products, and are often used in building structures and manufacturing and installation. Mechanical engineers can select the specific shape, material, heat treatment state, mechanical properties and other parameters of the profile according to the design requirements, and then divide the profile according to the specific size and shape requirements, and then further process or heat treat it to achieve the design accuracy requirements.

[0003] However, the existing profile process is simple and the shape is single, and the connection between profiles or profiles and other parts is mostly fixed by welding. This assembly method requires the use of welding equipment on the assembly site, which is troublesome to assemble and the harm of welding odor to the human body includes the impact on the respiratory system, nervous system and skin, and there is also a certain pollution to the natural ecological environment, and the use effect is not ideal. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a method for manufacturing a metal tube profile, comprising the following steps:

[0005] S1. Pickling and phosphating of substrate: Use metal round tube as substrate for pickling and phosphating to remove surface rust impurities and form a dense phosphating film on the surface to obtain a clean, smooth, wear-resistant and corrosion-resistant surface;

[0006] S2, cold drawing and forming of round tube heading and rolling: the head of the metal round tube is headed or rolled to make the head of the metal round tube smaller so that the head to be clamped can pass through the cavity of the forming mold, and then the head is clamped by a chuck and pulled through the forming mold to form a concave profile with a groove on the wall;

[0007] S3, annealing to eliminate residual stress; heat the cold-drawn profile to 550℃-650℃, keep it for 2-4 hours and then cool it naturally to complete annealing. After eliminating residual stress, the profile is not easy to bend and deform;

[0008] S4, cold-drawn nesting doll-type profile group: according to the process of steps S1-S3, cold-draw multiple sets of profiles of different sizes, assemble them in a nesting doll-type manner, and reserve assembly gaps between profiles;

[0009] S5. Open assembly holes in the profile; open through holes and screw holes in the grooves on the wall of the profile where holes need to be opened. When the through holes need to be converted into screw holes, rivet nuts are pulled inside the through holes to convert the through holes into screw holes for use;

[0010] S6. Profile assembly: Use screws through through holes and screw holes to fix profiles to profiles or profiles to other parts, which can replace the welding process.

[0011] As a preferred technical solution of the present invention, in S1, the metal round tube is first immersed in a phosphoric acid pickling solution for pickling to remove rust and impurities from the surface, and the phosphoric acid pickling solution reacts with the oxide on the surface of the metal round tube to remove rust and impurities on the surface of the metal round tube, and then the metal round tube is cleaned with clean water.

[0012] As a preferred technical solution of the present invention, in S1, the metal round tube that has been cleaned with clean water is quickly placed in a phosphating solution. The phosphoric acid in the phosphating solution can react with the metal ions on the surface of the metal round tube to form a dense, stable and non-oxidizable phosphating film, thereby improving the corrosion resistance and wear resistance of the metal round tube.

[0013] As a preferred technical solution of the present invention, in S1, a surface conditioning agent is added to the phosphating solution, and the surface conditioning agent performs a surface passivation treatment on the surface of the metal round tube to form a dense oxide film on the metal surface.

[0014] As a preferred technical solution of the present invention, in S2, the heading of the metal round tube is performed by an air hammer, and the pressing head of the metal round tube is performed by a mold, so that the head of the metal round tube becomes smaller so that the head to be clamped can pass through the molding mold cavity, which is convenient for the clamping tube to be pulled out on the other side.

[0015] As a preferred technical solution of the present invention, in S2, the metal round tube slowly passes through the forming die to form the metal round tube into a concave profile with grooves on the wall. The cold drawing forming operation needs to be performed two or three times to make the profile size more precise and the rounded corners more in place.

[0016] As a preferred technical solution of the present invention, in S6, the combination of profiles can generate new profiles or connectors.

[0017] As a preferred technical solution of the present invention, in S4, the outer length and width of the small profile is slightly smaller than the inner length and width of the large profile, and the slightly smaller part is the reserved assembly gap.

[0018] As a preferred technical solution of the present invention, in S5, the groove on the wall of the profile can bury the screw head of the screw, and can also bury the part joint connected to the profile, and the profile has four faces, and the four faces of the profile can be opened with through holes or screw holes of different shapes and sizes.

[0019] As a preferred technical solution of the present invention, in S6, when connecting profiles to profiles or connecting profiles to other parts, screws are passed through the through holes on the profiles and then screwed into the screw holes on another profile or other parts, thereby completing the horizontal and vertical connection between profiles or between profiles and other parts, thereby achieving welding-free connection.

[0020] Compared with the prior art, the present invention provides a method for manufacturing a metal tube profile, which has the following advantages:

[0021] Beneficial effects:

[0022] The manufacturing method of the metal tube profile is that after the profile is subjected to the processes of pickling and phosphating of the base material, cold drawing of the round tube heading and rolling, and annealing to eliminate residual stress, the overall strength, corrosion resistance, and wear resistance of the profile are greatly improved. The design of the grooves on the four sides of the profile allows multiple groups of profiles of different sizes to be connected in a nesting doll-like, horizontal, vertical, and columnar manner, meeting the assembly requirements of the profile in different application scenarios. The welding-free and grinding-free design changes the traditional welded products into detachable products, greatly reducing the packaging volume and greatly reducing the storage and transportation costs. At the same time, it provides solutions for extra-long and extra-wide products. There is no need to use welding equipment on the construction site, and the working environment is healthier. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a manufacturing method of a metal tube profile proposed by the present invention;

[0024] Figure 2 A schematic diagram of a profile structure of a method for manufacturing a metal tube profile proposed by the present invention;

[0025] Figure 3 A schematic diagram of a nesting doll-type connection assembly of a metal tube profile in a method for manufacturing the metal tube profile proposed by the present invention;

[0026] Figure 4 A schematic diagram of longitudinal connection and assembly of a metal tube profile in a method for manufacturing the metal tube profile proposed by the present invention;

[0027] Figure 5 A schematic diagram of the transverse connection and assembly of a metal tube profile in a method for manufacturing the metal tube profile proposed by the present invention;

[0028] Figure 6 The present invention provides a schematic diagram of a profile columnar connection assembly method for a metal tube profile.

[0029] In the figure: 1, profile; 2, groove; 3, through hole; 4, rivet nut; 5, screw; 6, screw hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-6 A method for manufacturing a metal tube profile comprises the following steps:

[0032] S1. Pickling and phosphating of substrate: Use metal round tube as substrate for pickling and phosphating to remove surface rust impurities and form a dense phosphating film on the surface to obtain a clean, smooth, wear-resistant and corrosion-resistant surface;

[0033] S2, cold drawing and forming of round tube heading and rolling; the head of the metal round tube is headed or rolled to make the head of the metal round tube smaller so that the head to be clamped can pass through the cavity of the forming mold, and then the head is clamped by a chuck and pulled through the forming mold to form a concave profile 1 with a groove 2 on the wall;

[0034] S3, annealing to eliminate residual stress; the cold-drawn profile 1 is heated to 550°C-650°C, kept for 2-4 hours and then naturally cooled to complete annealing. After the residual stress is eliminated, the profile 1 is not easy to bend and deform;

[0035] S4, a group of cold-drawn nesting doll-type profiles 1; according to the process of steps S1-S3, multiple sets of profiles 1 of different sizes are cold-drawn, and the profiles 1 are assembled in a nesting doll-type manner, and an assembly gap is reserved between the profiles 1;

[0036] S5, the profile 1 is provided with an assembly hole; a through hole 3 and a screw hole 6 are provided at the groove 2 on the wall of the profile 1 where a hole needs to be opened. When the through hole 3 needs to be converted into a screw hole 6, a rivet nut 4 is drawn inside the through hole 3 to convert the through hole 3 into a screw hole 6 for use;

[0037] S6, assembling the profile 1; fixing the profile 1 to the profile 1 or the profile 1 to other parts together with the screw 5 through the through hole 3 and the screw hole 6, which can replace the welding process.

[0038] As a specific technical solution of this embodiment, in S1, the metal round tube is first immersed in a phosphoric acid pickling solution for pickling to remove rust and impurities from the surface. The phosphoric acid pickling solution reacts with the oxide on the surface of the metal round tube to remove rust and impurities on the surface of the metal round tube, and then the metal round tube is cleaned with clean water. Phosphoric acid pickling can remove oxides, rust and dirt on the metal surface, making the surface clean and smooth, thereby improving the brightness of the surface, and can remove oxides on the metal surface, making the metal surface more active, thereby improving the adhesion of subsequent coatings or adhesives, and ensuring that the coatings or adhesives can be firmly attached to the metal surface.

[0039] As a specific technical solution of this embodiment, in S1, the metal round tube that has been cleaned with clean water is quickly placed in the phosphating solution. The phosphoric acid in the phosphating solution can react with the metal ions on the surface of the metal round tube to form a dense, stable and non-oxidizable phosphating film, thereby improving the corrosion resistance and wear resistance of the metal round tube. The phosphating treatment can form a protective film on the metal surface, which can effectively isolate the metal from direct contact with the external environment, thereby preventing the metal from being corroded and extending its service life. The phosphating layer can play a lubricating role, reduce the friction and wear of the metal during use, and improve the processing efficiency and product quality. The metal surface after phosphating treatment is usually smoother and more uniform, and the appearance quality is improved, which increases the aesthetics of the product.

[0040] As a specific technical solution of this embodiment, in S1, a surface adjuster is added to the phosphating solution, and the surface adjuster performs surface passivation treatment on the surface of the metal round tube to form a dense oxide film on the metal surface. The surface adjuster can eliminate impurities that may be brought in during the pretreatment of the metal surface, so that the phosphating film can be crystallized in a favorable direction, thereby reducing the consumption of the phosphating solution and the consumption of the accelerator. In the surface adjustment process before phosphating, the surface adjuster is adsorbed on the metal surface in the form of particles to form a layer of evenly distributed and large number of phosphating crystal nuclei. These crystal nuclei can limit the growth of large crystals, promote the fine and uniform crystallization of the phosphating film, improve the quality of the phosphating film, eliminate the effect of surface coarsening, and improve the uniformity of surface activity, so that the metal surface is more suitable for subsequent coating treatment. Phosphoric acid pickling solution, phosphating solution and surface adjuster are all common metal treatment materials on the market.

[0041] As a specific technical solution of this embodiment, in S2, the heading of the metal round tube is performed by an air hammer, and the pressing head of the metal round tube is performed by a mold, so that the head of the metal round tube becomes smaller so that the head to be clamped can pass through the molding mold cavity, which is convenient for the clamping tube to be pulled out on the other side.

[0042] As a specific technical solution of this embodiment, in S2, the metal round tube slowly passes through the forming die to form the metal round tube into a concave profile 1 with a groove 2 on the wall. The cold drawing forming operation needs to be performed two or three times to make the profile 1 more accurate in size and more rounded. When the metal round tube is cold drawn, in order to make the size more accurate and the rounded corners more in place, two or three cold drawing shaping operations are required to obtain a profile 1 with clear edges and corners and accurate size.

[0043] As a specific technical solution of this embodiment, in S6, the combination of profile 1 and profile 1 can generate a new profile or connecting piece.

[0044] As a specific technical solution of this embodiment, in S4, the outer length and width of the small profile 1 is slightly smaller than the inner length and width of the large profile 1, and the slightly smaller part is the reserved assembly gap, for example, the inner diameter-outer diameter: 22mm-33mm, 34mm-50mm, 51mm-80mm, 81mm-120mm, etc.; two, three or more groups of profiles 1 can be pulled out as needed, see Figure 3-6 , multiple groups of profiles 1 of different sizes can be connected in nesting doll style, horizontal, vertical, and columnar forms.

[0045] As a specific technical solution of the present embodiment, in the S5, the groove 2 on the wall of the profile 1 can bury the screw head of the screw 5, and can also bury the part joint connected to the profile 1, and the profile 1 has four faces, and the four faces of the profile 1 can open through holes 3 or screw holes 6 of different shapes and sizes. The sizes of the through holes 3 are different, and the actual size of the through holes 3 can be determined according to the specifications of the selected screws 5 or other fasteners. The rivet nut 4 is riveted inside the through hole 3, and the screw 5 can be screwed into the rivet nut 4 to fix the screw 5. At the same time, the screw head of the screw 5 is completely sunk into the inside of the groove 2 after being installed in place, and does not protrude from the wall of the profile 1. It is not easy to be scratched, and it is not easy to be loosened by collision, and the stability is further improved.

[0046] As a specific technical solution of this embodiment, in S6, when connecting profile 1 to profile 1 or connecting profile 1 to other parts, a screw 5 is passed through the through hole 3 on the profile 1 and then screwed to the screw hole 6 on another profile 1 or other parts, so as to complete the horizontal and vertical connection between profile 1 and profile 1 or profile 1 and other parts, and realize welding-free connection. When profile 1 is connected to other parts, such as when profile 1 is used as the four corner columns of a cabinet, the side panels and door panels of the cabinet are installed between two adjacent profiles 1, and the ends of the side panels or door panels can be embedded in the groove 2 and fixed by screws 5, so that the appearance of the assembled cabinet is more beautiful and the structural strength is greatly improved.

[0047] At the same time, the anti-pry function of the side panels or door panel ends has been added, which makes it safer to use. In this way, various cabinets, wardrobes, shelves, tables, houses, guardrails and stands can be quickly assembled without welding or grinding; modern workshop structures, military and disaster relief bridges and roads, tents with high support strength, home appliances, auto parts and other products; it can meet the needs of various DIY homemade assembly of various products.

[0048] At the same time, it can replace wooden products, increase strength and fire resistance; it is convenient to change traditional welded products into detachable products, greatly reduce packaging volume, greatly reduce storage and transportation costs, and provide solutions for extra-long and extra-wide products. This welding-free and grinding-free process protects the health of workers and the environment.

[0049] To sum up, the manufacturing method of the metal tube profile 1, after the profile 1 is treated by pickling and phosphating of the base material, cold drawing of the round tube heading and rolling, and annealing to eliminate residual stress, the overall strength, corrosion resistance and wear resistance of the profile 1 are greatly improved. The design of the grooves 2 on the four sides of the profile 1 allows multiple groups of profiles 1 of different sizes to be connected in a nesting, horizontal, vertical and columnar manner, meeting the assembly requirements of the profile 1 in different application scenarios. The welding-free and grinding-free design changes the traditional welded products into detachable products, greatly reducing the packaging volume and greatly reducing the storage and transportation costs. At the same time, it provides solutions for extra-long and extra-wide products. There is no need to use welding equipment on the construction site, and the working environment is healthier.

[0050] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a metal tube profile, characterized in that: The following steps are involved: S1. Pickling and phosphating of substrate: Use metal round tube as substrate for pickling and phosphating to remove surface rust impurities and form a dense phosphating film on the surface to obtain a clean, smooth, wear-resistant and corrosion-resistant surface; S2, cold drawing and forming of the round tube by punching and rolling the head; punching or rolling the head of the metal round tube to make the head of the metal round tube smaller so that the head to be clamped can pass through the cavity of the forming mold, and then clamping the head with a chuck and drawing it through the forming mold to form a concave profile (1) with a groove (2) on the wall; S3, annealing to eliminate residual stress; the cold-drawn profile (1) is heated to 550°C-650°C, kept for 2-4 hours and then naturally cooled to complete annealing. After the residual stress is eliminated, the profile (1) is not easy to bend and deform; S4, cold-drawn nesting doll-type profile (1) group; according to the process of steps S1-S3, cold-draw multiple sets of profiles (1) of different sizes, adopt nesting doll-type assembly, and reserve assembly gaps between profiles (1) and profiles (1); S5, the profile (1) is provided with an assembly hole; a through hole (3) and a screw hole (6) are provided at the groove (2) on the wall of the profile (1) where a hole is required to be provided, and when the through hole (3) needs to be converted into a screw hole (6), a rivet nut (4) is inserted inside the through hole (3), so that the through hole (3) can be converted into a screw hole (6) for use; S6, assembling the profile (1); fixing the profile (1) to the profile (1) or the profile (1) to other parts by screws (5) through the through holes (3) and the screw holes (6), which can replace the welding process.

2. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In S1, the metal round tube is first immersed in a phosphoric acid pickling solution for pickling to remove rust and impurities from the surface. The phosphoric acid pickling solution reacts with the oxide on the surface of the metal round tube to remove rust and impurities on the surface of the metal round tube, and then the metal round tube is cleaned with clean water.

3. The method for manufacturing a metal tube profile according to claim 2, characterized in that: In S1, the metal round tube that has been cleaned with clean water is quickly placed in a phosphating solution. The phosphoric acid in the phosphating solution can react with the metal ions on the surface of the metal round tube to form a dense, stable and non-oxidizable phosphating film, thereby improving the corrosion resistance and wear resistance of the metal round tube.

4. The method for manufacturing a metal tube profile according to claim 3, characterized in that: In S1, a surface conditioning agent is added to the phosphating solution, and the surface conditioning agent performs a surface passivation treatment on the surface of the metal round tube to form a dense oxide film on the metal surface.

5. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In S2, the metal round tube is headed by an air hammer, and the pressing head of the metal round tube is pressed by a mold, so that the head of the metal round tube becomes smaller so that the head to be clamped can pass through the molding mold cavity, which is convenient for the clamping tube on the other side to be pulled out.

6. The method for manufacturing a metal tube profile according to claim 5, characterized in that: In S2, the metal round tube slowly passes through the forming die to form the metal round tube into a concave profile (1) with a groove (2) on the wall. The cold drawing forming operation needs to be performed two or three times to make the profile (1) more accurate in size and more rounded.

7. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In S6, the combination of the profile (1) and the profile (1) can generate a new profile or a connecting piece.

8. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In S4, the outer length and width of the small profile (1) are slightly smaller than the inner length and width of the large profile (1), and the slightly smaller part is the reserved assembly gap.

9. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In the above-mentioned S5, the groove (2) on the wall surface of the profile (1) can bury the screw head of the screw (5) or the part joint connected to the profile (1), and the profile (1) has four faces, and the four faces of the profile (1) can be provided with through holes (3) or screw holes (6) of different shapes and sizes.

10. The method for manufacturing a metal tube profile according to claim 1, characterized in that: In S6, when the profiles (1) are connected to each other or the profiles (1) are connected to other parts, the screws (5) are passed through the through holes (3) on the profiles (1) and then screwed to the screw holes (6) on another profile (1) or other parts, so that the profiles (1) can be connected to each other in the horizontal or vertical direction or the vertical direction or the vertical direction, thereby realizing a welding-free connection.

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