A semi-cylindrical corner metal decorative profile and its cold bending manufacturing process

Abstract

The present invention belongs to the field of cold bending manufacturing technology, and specifically discloses a semi-cylindrical corner metal decorative profile and its cold bending manufacturing process; it comprises a profile body, the profile body comprises a semi-circular decorative surface, the back of the semi-circular decorative surface is provided with a connecting component, the connecting component comprises a first bending opening, a second bending opening and a third bending opening processed by cold bending; a cold bending manufacturing process of a semi-cylindrical corner metal decorative profile, comprising the following steps: S1, cold bending manufacturing process of the profile; S2, bending process of the bending opening of the profile; S3, welding and docking the third bending opening; S4, welding seam cooling process; S5, gap inspection; S6, auxiliary heat treatment; S7, shaping and sizing the profile; the present invention enables the semi-cylindrical corner metal decorative profile to form a semi-circular decorative profile; auxiliary heat treatment is performed on the semi-cylindrical corner metal decorative profile to improve the strength and hardness of the semi-cylindrical corner metal decorative profile.

Description

Technical Field

[0001] The invention belongs to the technical field of cold-bending production, and in particular relates to a semi-cylindrical corner metal decorative profile and a cold-bending production process thereof. Background Art

[0002] Cold roll forming is a plastic processing technology that uses multiple forming rollers arranged in sequence to continuously bend metal sheets such as coils and strips horizontally to form profiles with specific cross-sections.

[0003] Cold roll forming is a new process and technology for metal sheet forming that is material-saving, energy-saving and highly efficient. Using this process, not only can high-quality steel products be produced, but also the product development cycle can be shortened, production efficiency can be improved, and thus the market competitiveness of enterprises can be enhanced.

[0004] Roll forming has developed into the most efficient sheet metal forming technology. 35%-45% of rolled strip steel is processed into products by roll forming, which is more than the steel used in the automotive industry.

[0005] In recent years, cold-formed steel products have been widely used as important structural parts in many fields such as construction, automobile manufacturing, shipbuilding, electronics industry and machinery manufacturing. Its products range from ordinary guide rails, doors and windows and other structural parts to some special profiles made for special purposes, and the types are extremely wide. The cross-sectional performance per unit weight of cold-formed steel is better than that of hot-rolled steel products, and it has very high surface finish and dimensional accuracy. Therefore, cold-formed steel can replace hot-rolled steel to achieve the dual effects of saving steel and energy, so people attach great importance to the development of cold-formed steel. It is the users' constant desire for the variety, specifications, quality and other aspects of cold-formed steel products that has prompted the rapid development of cold-formed forming technology.

[0006] Corner metal decorative profiles have the functions of decorative beauty and safety protection. In order to improve the production of profiles, corners and bends are prepared through cold bending. However, there are still various problems in the cold bending of various decorative profiles on the market.

[0007] For example, a cold-bending manufacturing method for a single-wave beam guardrail disclosed in the authorization announcement number CN103286198A has greatly improved the rigidity of the product and ensured that the mechanical properties of the cross section can be fully utilized; this manufacturing process has played a good system forming role in controlling the cold-bending energy storage quality of the single-wave beam guardrail, improving the inner circle closing accuracy of the energy-gathering ring, and the connection strength. This manufacturing method has a reasonable structure, convenient operation, and high operating efficiency, but it does not solve the problem that the strength of the existing metal decorative profile is low after cold bending, and the strength and willfulness of the profile cannot be improved, which easily causes the metal decorative profile to break, and it is not easy to install after bending. For this reason, we propose a semi-cylindrical corner metal decorative profile and its cold-bending manufacturing process. Summary of the invention

[0008] The object of the present invention is to provide a semi-cylindrical corner metal decorative profile and a cold-bending manufacturing process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: a semi-cylindrical corner metal decorative profile, comprising a profile body, the profile body comprising a semi-circular decorative surface, both sides of the semi-circular decorative surface are provided with connecting components, the connecting components include a first bending opening processed by cold bending, the first bending opening is used for installing and clamping the semi-cylindrical corner metal decorative profile, a second bending opening is provided on one side of the first bending opening, a third bending opening is provided on one side of the second bending opening, the third bending opening is used for welding both sides of the profile, so that the middle part forms a supporting surface;

[0010] The semicircular decorative surface is subjected to arc-shaped cold bending processing so that the semicircular decorative surface can form a semicircular arc surface;

[0011] The first bending opening, the second bending opening and the third bending opening are subjected to cold bending manufacturing processing simultaneously with the semicircular decorative surface, and during the cold bending processing, the plate is subjected to corner bending processing so that the decorative profile can form a corner;

[0012] When the first bending opening, the second bending opening and the third bending opening are initially cold-bent, they are all bent outwards, and the first bending opening, the second bending opening and the third bending opening are formed at the same time, and the first bending opening, the second bending opening and the third bending opening are kept at the same level;

[0013] The first bending opening, the second bending opening and the third bending opening are bent at the connection between the first bending opening and the semicircular decorative surface, and between the first bending opening and the second bending opening through an arc-shaped cold bending processing mechanism, so that the first bending opening, the second bending opening and the third bending opening can be bent and arranged on the rear side of the semicircular decorative surface.

[0014] Preferably, the ends of the third bending openings on both sides are welded to form welds, that is, the end faces of the third bending openings on both sides are in contact, and the contacting end faces are welded to form welds, thereby maintaining the stability of the connection of the third bending openings on both sides, as well as the flushness and support of the third bending openings on both sides.

[0015] A cold bending manufacturing process for a semi-cylindrical corner metal decorative profile, used for manufacturing the semi-cylindrical corner metal decorative profile, comprises the following steps:

[0016] S1. Cold-bending the profile: cold-bending the profile through a cold-bending mechanism to form a semicircular decorative surface, a first bending opening, a second bending opening, and a third bending opening, and simultaneously performing corner bending on the profile to form a corner metal decorative profile;

[0017] S2. Bending the bend of the profile: bending the first bend and the semicircular decorative surface, and bending the second bend and the third bend, so that the first bend, the second bend and the third bend can be bent and arranged at the rear side of the semicircular decorative surface;

[0018] S3, welding and docking the third bending opening: welding the contact surface of the third bending opening by high-frequency welding to maintain the flushness and support of the third bending opening on both sides for easy support;

[0019] S4, welding seam cooling treatment: cooling the welding end surface of the third bending mouth, and cleaning the welding residue after the welding gap cools to room temperature;

[0020] S5. Gap inspection: Use high-definition industrial cameras to monitor welds and cold bends to detect whether the welding is complete and whether there are damages or gaps in the cold bends;

[0021] S6, auxiliary heat treatment: heat the semi-cylindrical corner metal decorative profile by heating the profile, and perform furnace cooling after heating to cool the semi-cylindrical corner metal decorative profile to room temperature;

[0022] S7. Shaping and sizing the profile: After the semi-cylindrical corner metal decorative profile is heat-treated, it is shaped to improve the appearance of the profile, and the semi-cylindrical corner metal decorative profile is cut according to the required size. Finally, the semi-cylindrical corner metal decorative profile is deburred and electroplated or painted.

[0023] Preferably, the bending process in S2 is performed using a bending device, that is, the bending angle of the bending device is the same as that of the semicircular decorative surface, so as to facilitate bending of the first bending opening and the semicircular decorative surface, the second bending opening and the third bending opening.

[0024] Preferably, the auxiliary heat treatment of S6 is to heat the semi-cylindrical corner metal decorative profile after the cold bending treatment, so as to eliminate the change of metal stress and the fracture of the connection force between the grains of the semi-cylindrical corner metal decorative profile after the cold bending treatment. By heat treating the semi-cylindrical corner metal decorative profile, the semi-cylindrical corner metal decorative profile can eliminate the stress unevenness and the connection fracture between the metal grains, thereby improving the strength and hardness of the semi-cylindrical corner metal decorative profile;

[0025] The furnace is cooled by introducing high-purity Ar into the furnace, and the Ar pressure is 60-80MPa; specifically, the furnace is cooled to room temperature rapidly at a cooling rate of 5-10°C / s.

[0026] Preferably, the steps of removing burrs and electroplating or painting in S7 are as follows:

[0027] S701, cutting the semi-cylindrical corner metal decorative profile to a certain size to obtain a semi-cylindrical corner metal decorative profile of a corresponding size;

[0028] S702, grinding the edges of the semi-cylindrical corner metal decorative profile and grinding the welds to make the end faces and welds of the semi-cylindrical corner metal decorative profiles smoother;

[0029] S703, cleaning the semi-cylindrical corner metal decorative profile, firstly, washing the surface of the semi-cylindrical corner metal decorative profile with clean water to remove dust on the surface of the semi-cylindrical corner metal decorative profile, then washing the semi-cylindrical corner metal decorative profile with alkaline solution to remove oil stains on the surface of the semi-cylindrical corner metal decorative profile, and finally, washing the semi-cylindrical corner metal decorative profile with distilled water to clean the alkaline solution on the surface of the semi-cylindrical corner metal decorative profile;

[0030] S704. Electroplating or painting the semi-cylindrical corner metal decorative profile. According to the process requirements of the semi-cylindrical corner metal decorative profile, selectively electroplate the surface of the semi-cylindrical corner metal decorative profile, or paint the inside and outside of the semi-cylindrical corner metal decorative profile to protect the semi-cylindrical corner metal decorative profile.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] When the present invention is used, the semi-cylindrical corner metal decorative profile is processed, that is, the semi-cylindrical corner metal decorative profile can be formed into a semicircular decorative profile, and can be bent, which is convenient for forming the semi-cylindrical corner metal decorative profile, and the rear end is supported and installed by bending and cold bending, that is, the semi-cylindrical corner metal decorative profile is installed and connected through the first bending opening, the clamping installation of the semi-cylindrical corner metal decorative profile is improved, and the installation of the semi-cylindrical corner metal decorative profile is conveniently supported and the strength is improved by setting the third bending opening, and the welds are formed by welding between the third bending openings, which is convenient for improving the connectivity of the two sides of the third bending opening and improving the strength of the support;

[0033] The semi-cylindrical corner metal decorative profile is subjected to cold bending and folding treatment so that the semi-cylindrical corner metal decorative profile can form a curved and semi-cylindrical surface, and after the treatment, the semi-cylindrical corner metal decorative profile is subjected to auxiliary heat treatment. By heating the semi-cylindrical corner metal decorative profile, the change of metal stress and the fracture of the connection force between the grains of the semi-cylindrical corner metal decorative profile after the cold bending treatment are eliminated, that is, the semi-cylindrical corner metal decorative profile is subjected to heat treatment so that the semi-cylindrical corner metal decorative profile can eliminate the stress unevenness and the connection fracture between the metal grains, thereby improving the strength and hardness of the semi-cylindrical corner metal decorative profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the right structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the left structure of the present invention;

[0036] Figure 3 It is a schematic diagram of the steps of the present invention.

[0037] In the figure: 1. Semicircular decorative surface; 2. First bending opening; 3. Second bending opening; 4. Third bending opening; 5. Welding seam. DETAILED DESCRIPTION

[0038] 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.

[0039] See also Figure 1-Figure 2 The present invention provides a technical solution: a semi-cylindrical corner metal decorative profile, comprising a profile body, the profile body including a semi-circular decorative surface 1, both sides of the semi-circular decorative surface 1 are provided with connecting components, the connecting component includes a first bending mouth 2 processed by cold bending, the first bending mouth 2 is used for installing and snap-fitting the semi-cylindrical corner metal decorative profile, a second bending mouth 3 is provided on one side of the first bending mouth 2, a third bending mouth 4 is provided on one side of the second bending mouth 3, the third bending mouth 4 is used for welding both sides of the profile to form a supporting surface in the middle.

[0040] In order to realize the cold bending treatment of the semi-cylindrical corner metal decorative profile and form an arc surface, in the present embodiment, preferably, the semi-circular decorative surface 1 is subjected to arc cold bending treatment so that the semi-circular decorative surface 1 can form a semi-circular arc surface.

[0041] In order to realize the corner setting of the semi-cylindrical corner metal decorative profile, the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 can be located on the rear side of the semi-circular decorative surface 1 for easy installation. In this embodiment, preferably, the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are cold-bent and manufactured synchronously with the semi-circular decorative surface 1, and when the cold bending process is performed, the plate is bent so that the decorative profile can form a corner.

[0042] In order to facilitate the bending process of the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4, in the present embodiment, preferably, the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are bent outwards during the initial cold bending process, and the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are formed at the same time, and the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are kept at the same level.

[0043] In order to realize that the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are on the rear side to facilitate the installation connection, in this embodiment, preferably, the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 are bent at the connection between the first bending mouth 2 and the semicircular decorative surface 1 through an arc-shaped cold bending processing mechanism, and the first bending mouth 2 and the second bending mouth 3 are bent, so that the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4 can be bent and arranged on the rear side of the semicircular decorative surface 1.

[0044] In order to realize welding of the third bending opening 4 and maintain the stability of the support, in the present embodiment, preferably, the ends of the third bending opening 4 on both sides are welded to form a weld 5, that is, the end faces of the third bending opening 4 on both sides are in contact, and the contacting end faces are welded to form a weld 5, so as to maintain the stability connection of the third bending opening 4 on both sides, and the flushness and support of the third bending opening 4 on both sides.

[0045] refer to Figure 3 A cold bending process for producing a semi-cylindrical corner metal decorative profile comprises the following steps:

[0046] S1. Cold-bending the profile: cold-bending the profile through a cold-bending mechanism to form a semicircular decorative surface 1, a first bending opening 2, a second bending opening 3 and a third bending opening 4, and simultaneously performing a corner bending process on the profile to form a corner metal decorative profile;

[0047] S2. Bend the bend of the profile: bend the first bend 2 and the semicircular decorative surface 1, and bend the second bend 3 and the third bend 4, so that the first bend 2, the second bend 3 and the third bend 4 can process the rear side of the semicircular decorative surface 1;

[0048] S3, welding and docking the third bending opening 4: welding the contact surface of the third bending opening 4 by high-frequency welding to maintain the flushness and support of the third bending opening 4 on both sides for easy support;

[0049] S4, welding seam cooling treatment: cooling the welding end surface of the third bending opening 4, and cleaning the welding residue after the welding gap 5 cools to room temperature;

[0050] S5, gap inspection: use high-definition industrial cameras to monitor the weld 5 and cold bends to detect whether the welding is complete and whether there are damages or gaps in the cold bends;

[0051] S6, auxiliary heat treatment: heat the semi-cylindrical corner metal decorative profile by heating the profile, and perform furnace cooling after heating to cool the semi-cylindrical corner metal decorative profile to room temperature;

[0052] S7. Shaping and sizing the profile: After the semi-cylindrical corner metal decorative profile is heat-treated, it is shaped to improve the appearance of the profile, and the semi-cylindrical corner metal decorative profile is cut according to the required size. Finally, the semi-cylindrical corner metal decorative profile is deburred and electroplated or painted.

[0053] In order to facilitate the bending of the first bending mouth 2, the second bending mouth 3 and the third bending mouth 4, so as to facilitate them to be located on the rear side of the semicircular decorative surface 1 and improve the connectivity of the installation, in this embodiment, preferably, the bending process in S2 is performed using a bending device, that is, the bending angle of the bending device is the same as that of the semicircular decorative surface 1, so as to facilitate the bending of the first bending mouth 2 and the semicircular decorative surface 1, the second bending mouth 3 and the third bending mouth 4.

[0054] In order to eliminate the stress and grain connection of the semi-cylindrical corner metal decorative profile after bending and improve the strength of the semi-cylindrical corner metal decorative profile, in this embodiment, preferably, the auxiliary heat treatment of S6 is to heat the semi-cylindrical corner metal decorative profile after cold bending treatment, so as to eliminate the change of metal stress and the break of the connection force between the grains of the semi-cylindrical corner metal decorative profile after cold bending treatment. By heat treating the semi-cylindrical corner metal decorative profile, the semi-cylindrical corner metal decorative profile can eliminate the stress unevenness and the connection break between the metal grains, thereby improving the strength and hardness of the semi-cylindrical corner metal decorative profile;

[0055] The furnace is cooled by introducing high-purity Ar into the furnace, and the Ar pressure is 60-80MPa; specifically, the furnace is cooled to room temperature rapidly at a cooling rate of 5-10°C / s.

[0056] In order to process the semi-cylindrical corner metal decorative profile and improve its protection, in this embodiment, preferably, the steps of removing burrs and electroplating or painting in S7 are as follows:

[0057] S701, cutting the semi-cylindrical corner metal decorative profile to a certain size to obtain a semi-cylindrical corner metal decorative profile of a corresponding size;

[0058] S702, grinding the edges of the semi-cylindrical corner metal decorative profile and grinding the weld to make the end surface and weld 5 of the semi-cylindrical corner metal decorative profile smoother;

[0059] S703, cleaning the semi-cylindrical corner metal decorative profile, firstly, washing the surface of the semi-cylindrical corner metal decorative profile with clean water to remove dust on the surface of the semi-cylindrical corner metal decorative profile, then washing the semi-cylindrical corner metal decorative profile with alkaline solution to remove oil stains on the surface of the semi-cylindrical corner metal decorative profile, and finally, washing the semi-cylindrical corner metal decorative profile with distilled water to clean the alkaline solution on the surface of the semi-cylindrical corner metal decorative profile;

[0060] S704. Electroplating or painting the semi-cylindrical corner metal decorative profile. According to the process requirements of the semi-cylindrical corner metal decorative profile, selectively electroplate the surface of the semi-cylindrical corner metal decorative profile, or paint the inside and outside of the semi-cylindrical corner metal decorative profile to protect the semi-cylindrical corner metal decorative profile.

[0061] The working principle and use process of the present invention:

[0062] Step 1: cold-bending the profile: cold-bending the profile through a cold-bending mechanism to form a semicircular decorative surface 1, a first bending opening 2, a second bending opening 3 and a third bending opening 4, and simultaneously performing a corner bending process on the profile to form a corner metal decorative profile;

[0063] Step 2, bend the bend of the profile: bend the first bend 2 and the semicircular decorative surface 1, and bend the second bend 3 and the third bend 4, so that the first bend 2, the second bend 3 and the third bend 4 can process the rear side of the semicircular decorative surface 1;

[0064] Step 3: Welding and docking the third bending opening 4: welding the contact surface of the third bending opening 4 by high-frequency welding to maintain the flushness and support of the third bending opening 4 on both sides for easy support;

[0065] Step 4: Cooling the weld: Cooling the weld end surface of the third bending opening 4, and cleaning the welding residue after the welding gap 5 cools to room temperature;

[0066] Step 5, gap 5 inspection: use a high-definition industrial camera to monitor the weld 5 and the cold bend to detect whether the welding is complete and whether there is damage or gap at the cold bend;

[0067] Step 6, auxiliary heat treatment: heat the semi-cylindrical corner metal decorative profile by heating the profile, and perform furnace cooling after heating to cool the semi-cylindrical corner metal decorative profile to room temperature;

[0068] Step 7: Shape and size the profile: After the semi-cylindrical corner metal decorative profile is heat treated, it is shaped to improve the appearance of the profile, and the semi-cylindrical corner metal decorative profile is cut according to the required size. Finally, the semi-cylindrical corner metal decorative profile is deburred and electroplated or painted.

[0069] 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 semi-cylindrical corner metal decorative profile, characterized in that: The invention comprises a profile body, wherein the profile body comprises a semicircular decorative surface (1), and connecting components are provided on both sides of the semicircular decorative surface (1), wherein the connecting components comprise a first bending opening (2) processed by cold bending, wherein the first bending opening (2) is used for installing and snap-fitting a semi-cylindrical corner metal decorative profile, wherein a second bending opening (3) is provided on one side of the first bending opening (2), and a third bending opening (4) is provided on one side of the second bending opening (3), wherein the third bending opening (4) is used for welding two sides of the profile so that a support surface is formed in the middle; The semicircular decorative surface (1) is subjected to arc-shaped cold bending processing, so that the semicircular decorative surface (1) can form a semicircular arc surface; The first bending opening (2), the second bending opening (3) and the third bending opening (4) are subjected to a cold bending manufacturing process simultaneously with the semicircular decorative surface (1), and during the cold bending process, the plate is subjected to an angle bending process so that the decorative profile can form a corner; When the first bending opening (2), the second bending opening (3) and the third bending opening (4) are initially subjected to cold bending treatment, they are all bent outwards, and the first bending opening (2), the second bending opening (3) and the third bending opening (4) are formed simultaneously, and the first bending opening (2), the second bending opening (3) and the third bending opening (4) are kept at the same level; The first bending opening (2), the second bending opening (3) and the third bending opening (4) are subjected to a bending process at the connection between the first bending opening (2) and the semicircular decorative surface (1), and a bending process is performed between the first bending opening (2) and the second bending opening (3), so that the first bending opening (2), the second bending opening (3) and the third bending opening (4) can be bent and arranged at the rear side of the semicircular decorative surface (1).

2. A semi-cylindrical corner metal decorative profile according to claim 1, characterized in that: The ends of the third bending openings (4) on both sides are welded to form welds (5), that is, the end faces of the third bending openings (4) on both sides are in contact, and the contacting end faces are welded to form welds (5), thereby maintaining the stability of the connection of the third bending openings (4) on both sides, and the flushness and support of the third bending openings (4) on both sides.

3. A cold bending manufacturing process for semi-cylindrical corner metal decorative profiles, used for manufacturing the semi-cylindrical corner metal decorative profiles according to any one of claims 1-2, characterized in that: The following steps are included: S1. Cold-bending the profile: cold-bending the profile through a cold-bending mechanism to form a semicircular decorative surface (1), a first bending opening (2), a second bending opening (3) and a third bending opening (4), and simultaneously performing a corner bending process on the profile to form a corner metal decorative profile; S2, performing a bending process on the bent opening of the profile: performing a bending process on the first bending opening (2) and the semicircular decorative surface (1), and performing a bending process on the second bending opening (3) and the third bending opening (4), so that the first bending opening (2), the second bending opening (3) and the third bending opening (4) can be bent and arranged on the rear side of the semicircular decorative surface (1); S3, welding and docking the third bending opening (4): welding the contact surface of the third bending opening (4) by high-frequency welding, so as to maintain the flushness and support of the third bending opening (4) on both sides, so as to facilitate support; S4, welding seam cooling treatment: cooling the welding end surface of the third bending opening (4), and cleaning the welding residue after the welding seam is cooled to room temperature; S5. Gap inspection: Use a high-definition industrial camera to monitor the weld (5) and the cold bend to check whether the weld is complete and whether there is damage or gap at the cold bend; S6, auxiliary heat treatment: heat the semi-cylindrical corner metal decorative profile by heating the profile, and perform furnace cooling after heating to cool the semi-cylindrical corner metal decorative profile to room temperature; S7. Shaping and sizing the profile: After the semi-cylindrical corner metal decorative profile is heat-treated, it is shaped to improve the appearance of the profile, and the semi-cylindrical corner metal decorative profile is cut according to the required size. Finally, the semi-cylindrical corner metal decorative profile is deburred and electroplated or painted.

4. The cold-bending manufacturing process of a semi-cylindrical corner metal decorative profile according to claim 3 is characterized in that: The bending process in S2 is performed by using a bending device, i.e. the bending device has the same bending angle as the semicircular decorative surface (1), so as to facilitate the bending process of the first bending opening (2) and the semicircular decorative surface (1), the second bending opening (3) and the third bending opening (4).

5. The cold-bending manufacturing process of a semi-cylindrical corner metal decorative profile according to claim 4 is characterized in that: The auxiliary heat treatment of S6 is to heat the semi-cylindrical corner metal decorative profile after the cold bending treatment, so as to eliminate the change of metal stress and the fracture of the connection force between the grains of the semi-cylindrical corner metal decorative profile after the cold bending treatment. By heat treating the semi-cylindrical corner metal decorative profile, the semi-cylindrical corner metal decorative profile can eliminate the stress unevenness and the connection fracture between the metal grains, thereby improving the strength and hardness of the semi-cylindrical corner metal decorative profile; The furnace is cooled by introducing high-purity Ar into the furnace, and the Ar pressure is 60-80MPa; specifically, the furnace is cooled to room temperature rapidly at a cooling rate of 5-10°C / s.

6. The cold-bending manufacturing process of a semi-cylindrical corner metal decorative profile according to claim 5 is characterized in that: The steps of removing burrs and electroplating or painting in S7 are as follows: S701, cutting the semi-cylindrical corner metal decorative profile to a certain size to obtain a semi-cylindrical corner metal decorative profile of a corresponding size; S702, grinding the edge of the semi-cylindrical corner metal decorative profile and grinding the weld (5) to make the end surface and weld (5) of the semi-cylindrical corner metal decorative profile smoother; S703, cleaning the semi-cylindrical corner metal decorative profile, firstly, washing the surface of the semi-cylindrical corner metal decorative profile with clean water to remove dust on the surface of the semi-cylindrical corner metal decorative profile, then washing the semi-cylindrical corner metal decorative profile with alkaline solution to remove oil stains on the surface of the semi-cylindrical corner metal decorative profile, and finally, washing the semi-cylindrical corner metal decorative profile with distilled water to clean the alkaline solution on the surface of the semi-cylindrical corner metal decorative profile; S704. Electroplating or painting the semi-cylindrical corner metal decorative profile. According to the process requirements of the semi-cylindrical corner metal decorative profile, selectively electroplate the surface of the semi-cylindrical corner metal decorative profile, or paint the inside and outside of the semi-cylindrical corner metal decorative profile to protect the semi-cylindrical corner metal decorative profile.

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