Aluminum material forming method capable of preventing oxidation color difference

Abstract

The application discloses an aluminum material forming method capable of preventing color difference caused by oxidation, and relates to the technical field of aluminum material production and manufacturing. The method comprises the following steps: S200, synchronous extrusion and punching forming, putting an initial blank into an upper forming die and a lower forming die, the upper forming die and the lower forming die are provided with a model cavity and a plurality of convex points which are uniformly arranged on the side of the model cavity; the convex points are protruded towards the direction of the lower forming die; the initial blank in the upper forming die and the lower forming die is extruded to form a preset protruding part on the surface of the initial blank, and the initial blank is punched to form a plurality of concave pits which are uniformly arranged on the surface of the initial blank and on the side of the preset protruding part, thereby obtaining a forming blank. The method has the advantages of high consistency of the density of the final product, no color difference caused by oxidation, and high appearance quality of the final product.

Description

Technical Field

[0001] This invention relates to the field of aluminum material production and manufacturing technology, and specifically to an aluminum material forming method that prevents oxidation and color difference. Background Technology

[0002] Aluminum extrusion molding (or aluminum die forming) is an aluminum processing method in which aluminum billets are placed in a die cavity (or extrusion cylinder) and subjected to strong pressure, forcing the aluminum billets to undergo directional plastic deformation and be extruded from the die (or extrusion cylinder) to obtain parts or semi-finished products with specific cross-sectional shapes (i.e., specific protrusions on the surface) and dimensions. This process primarily utilizes the fluidity of aluminum. However, during extrusion molding, the area near the specific protrusions on the aluminum surface may experience a higher density than other parts of the aluminum surface due to the greater pressure applied during extrusion. This results in uneven density on the aluminum surface after extrusion molding, leading to noticeable color differences on the aluminum surface during anodizing and affecting the quality of the final product. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing an aluminum forming method that prevents oxidation and color difference, which has the advantages of high density consistency of the final product, no color difference after oxidation, and high appearance quality of the final product.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a method for forming aluminum material to prevent oxidation and color difference, comprising the following steps:

[0005] S200. The initial blank is placed into the upper forming mold and the lower forming mold. The upper forming mold has a mold cavity and a plurality of protrusions evenly arranged around the mold cavity on one side that mates with the lower forming mold. The protrusions protrude toward the lower forming mold.

[0006] The blank located in the upper forming mold and the lower forming mold is extruded to form a preset protrusion on the surface of the blank. At the same time, the blank is stamped to stamp a plurality of uniformly arranged pits on the surface of the blank and around the preset protrusion, thereby obtaining a formed blank.

[0007] In a further embodiment of the present invention, in step S200, the stamping pressure is set to be greater than 250t.

[0008] In a further embodiment of the present invention, in step S200, the time for the extrusion and stamping to be performed simultaneously is set to 15s-60s.

[0009] The present invention further includes the following steps before step S200: S100, preparing the initial blank and performing a preliminary treatment on the initial blank.

[0010] The present invention further includes step S100, which comprises the following steps:

[0011] S110. Cut the aluminum material into the initial blank;

[0012] S120. Perform a surface treatment on the initial blank;

[0013] S130. The initial blank after one surface treatment is heated.

[0014] The present invention further includes the following step in step S120:

[0015] S121. Degreasing: The initial blank is placed in an alkaline degreasing solution or a neutral surfactant for degreasing.

[0016] S122. Peeling: Immerse the degreased blank in an acidic solution to remove the surface oxide scale.

[0017] S123. Place the peeled blank into a water tank containing pure water for ultrasonic cleaning.

[0018] S124. The initial blank after ultrasonic cleaning is washed with water at least three more times.

[0019] In a further embodiment of the present invention, in step S110, a machining allowance of 2-5 mm is reserved on the surface, bottom surface and side surface of the initial blank.

[0020] In a further embodiment of the present invention, the aluminum material is 1050-O state aluminum.

[0021] The present invention further includes the following steps after step S200:

[0022] S300, Cooling and shaping: The molded blank is cooled by air cooling, water cooling or air cooling.

[0023] S400, fine machining, uses CNC machining to finely process the cooled and formed blank to remove burrs and pits, thereby obtaining the formed aluminum material;

[0024] S500, anodizing of shaped aluminum materials.

[0025] The present invention further includes step S500, which includes the following steps:

[0026] S510. Perform secondary surface treatment on the shaped aluminum material;

[0027] S520, Anodizing, to generate an oxide layer with micropores on the surface of the formed aluminum material. The beneficial effects of this invention after adopting the above technical solution are as follows: In this invention, during extrusion molding, the mold cavity forces the initial blank to form a preset protrusion. Due to the obstruction of material flow around the preset protrusion, local pressure concentration and increased density occur. This aluminum material forming method for preventing oxidation color difference uses an upper forming mold to simultaneously press the periphery of the preset protrusion, causing multiple points of pressure on the surface of the initial blank. During pressing, multiple uniformly arranged pits are formed around the periphery of the preset protrusion, forcing the aluminum material in the preset protrusion to flow around the pits, avoiding the generation of ripples on the surface of the initial blank. This makes the density around the preset protrusion and other areas of the aluminum material surface tend to be consistent, resulting in high density consistency in the final product. This further ensures a consistent rate of oxide layer formation during subsequent anodizing, ultimately ensuring no color difference after oxidation and a high-quality appearance for the final product. Furthermore, the simultaneous extrusion and pressing of the initial blank avoids secondary density differences that may result from step-by-step processing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart illustrating the aluminum forming method for preventing oxidation and color difference.

[0030] Figure 2 This is a schematic diagram of the structure of the formed blank.

[0031] Explanation of reference numerals in the attached drawings: 100, forming blank; 110, pre-set protrusion; 120, pit. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0034] This embodiment relates to a method for forming aluminum materials to prevent oxidation and color difference, referring to... Figures 1-2 This includes the following steps:

[0035] S200, extrusion and stamping are performed simultaneously. The blank is placed into the upper forming mold and the lower forming mold. The upper forming mold and the lower forming mold have a mold cavity and multiple protrusions that are evenly arranged around the mold cavity on one side. The protrusions protrude towards the lower forming mold. The blank in the upper forming mold and the lower forming mold are extruded to form specific protrusions on the surface of the blank. At the same time, the blank is stamped to stamp multiple evenly arranged pits 120 on the surface of the blank and around the protrusions, thereby obtaining the formed blank 100. Specifically, during extrusion molding, the mold cavity forces the billet to form a pre-set protrusion 110. Due to the obstruction of material flow around the pre-set protrusion 110, local pressure concentration and increased density occur. This aluminum forming method for preventing oxidation color difference uses an upper forming die to simultaneously stamp the periphery of the pre-set protrusion 110, causing multiple points of pressure on the surface of the billet. During stamping, multiple evenly distributed pits 120 are formed around the pre-set protrusion 110, forcing the aluminum material in the pre-set protrusion 110 to flow around the pits 120, avoiding the generation of ripples on the surface of the billet. This makes the density around the pre-set protrusion 110 tend to be consistent with other areas of the aluminum surface, resulting in high density consistency in the final product. This further ensures a consistent rate of oxide layer formation during subsequent anodizing, ultimately guaranteeing no color difference after oxidation and ensuring a high-quality appearance for the final product. In addition, the simultaneous extrusion and stamping of the billet avoids secondary density differences that may result from step-by-step processing. In this embodiment, an extruder is used to extrude the billet, and the pre-set protrusion 110 can be a stud. In some embodiments, the pre-set protrusion 110 can also be a conical boss.

[0036] Further, in step S200, the stamping pressure is set to be greater than 250t to ensure that uniformly distributed pits 120 are stamped on the surface of the blank. In this embodiment, it is sufficient that the stamping pressure is greater than 250t; no specific limitation is imposed. Further, in step S200, the time for simultaneous extrusion and stamping is set to 15s-60s. In this embodiment, the time for simultaneous extrusion and stamping is set to 15s. In some embodiments, the time for simultaneous extrusion and stamping is set to 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s, or 60s. It is sufficient that the time for simultaneous extrusion and stamping is within the range of 15s-60s; no specific limitation is imposed.

[0037] Furthermore, prior to step S200, the following steps are included: S100, preparing a preliminary billet and performing preliminary treatment on the billet to ensure the quality of subsequent processing of the billet. Specifically, step S100 includes the following steps:

[0038] S110. Cut the aluminum material into the initial blank;

[0039] S120. Perform a surface treatment on the initial blank;

[0040] S130. The initial blank after one surface treatment is heated.

[0041] Specifically, in step S110, a machining allowance of 2-5mm is reserved on the surface, bottom surface, and sides of the blank for subsequent fine machining removal. In this embodiment, a 2mm allowance can be reserved on the surface, bottom surface, and sides of the blank. In some embodiments, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm can be reserved on the surface, bottom surface, and sides of the blank. It is sufficient that the machining allowance reserved on the surface, bottom surface, and sides of the blank is within the range of 2-5mm; no specific limitation is imposed here.

[0042] Step S120 further includes the following steps:

[0043] S121. Degreasing: Place the initial blank in an alkaline degreasing solution or a neutral surfactant for degreasing.

[0044] S122. Peeling: Soak the degreased blank in an acidic solution to remove the surface oxide scale.

[0045] S123. Place the peeled blank into a water tank containing pure water for ultrasonic cleaning.

[0046] S124. Wash the preform with water at least three more times after ultrasonic cleaning.

[0047] Specifically, in step S121, the alkaline degreasing solution can be a strongly alkaline degreasing solution containing sodium hydroxide, a sodium carbonate-based degreasing solution, etc. The neutral surfactant can be an imidazoline surfactant, a fatty alcohol polyoxyethylene ether, etc. In step S121, the initial billet is degreased using an alkaline degreasing solution or a neutral surfactant to remove rolling oil and dust. In step S122, an acidic solution such as 10% dilute hydrochloric acid is used to remove the oxide scale from the surface of the initial billet after degreasing. After removing the grease and oxide scale from the surface of the initial billet, it is then cleaned in steps S123 and S124 to avoid acid and alkali residue and to further remove impurities from the surface of the initial billet.

[0048] In this embodiment, the aluminum material is 1050-O temper aluminum. 1050 aluminum refers to industrial pure aluminum with an aluminum content greater than 99.5%, which has advantages such as low density, good corrosion resistance, and good ductility. O temper refers to the state of the aluminum alloy after complete annealing. 1050-O temper aluminum exhibits excellent formability and machinability.

[0049] Furthermore, referring to Figure 1 The steps following step S200 include the following steps:

[0050] S300 Cooling and shaping: The molded blank 100 is cooled by air cooling, water cooling or air cooling.

[0051] S400, fine machining: the cooled blank 100 is finely machined by CNC machining to remove burrs and pits 120, thereby obtaining the shaped aluminum material.

[0052] S500, anodizing of shaped aluminum materials.

[0053] Specifically, in this embodiment, in step S300, the forming blank 100 is cooled by air cooling. For example, cooling fans are installed around the upper and lower forming molds to blow air onto the forming blank 100 for cooling. In some embodiments, in step S300, water cooling or air cooling (i.e., natural cooling) can also be used to cool the forming blank 100. In step S400, burrs and pits 120 on the surface of the cooled forming blank 100 are removed by CNC machining, i.e., numerical control machining technology, to ensure that the surface of the finely processed aluminum material is flat, providing a uniform and clean substrate for anodizing, and ensuring strong adhesion and uniform thickness of the oxide film.

[0054] Further, step S500 includes the following steps:

[0055] S510. Perform secondary surface treatment on the shaped aluminum material;

[0056] S520, Anodizing, generates an oxide layer with micropores on the surface of the formed aluminum material. After fine processing, the surface of the formed aluminum material is covered with grease and impurities. In step S510, an alkaline degreasing solution or neutral surfactant is used to remove the grease from the surface of the formed aluminum material, followed by the removal of the oxide scale using an acidic solution (e.g., low-concentration phosphoric acid (5%-10%) or a sulfuric acid-hydrofluoric acid mixture). Finally, the material is rinsed three times with water to ensure no acid or alkaline solution residue remains. During anodizing in step S520, a positive pulse is used to reduce edge effects.

[0057] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An aluminum material forming method for preventing oxidation color difference, characterized by, Includes the following steps: S200, extrusion and stamping are performed simultaneously. The blank is placed into the upper forming mold and the lower forming mold. The upper forming mold and the lower forming mold have a mold cavity and multiple protrusions that are evenly arranged around the mold cavity on one side. The protrusions protrude toward the lower forming mold; The blank located in the upper forming mold and the lower forming mold is extruded to form a preset protrusion (110) on the surface of the blank. At the same time, the blank is stamped to stamp out a plurality of uniformly arranged pits (120) on the surface of the blank and on the periphery of the preset protrusion (110), thereby obtaining a formed blank (100).

2. The method of claim 1, wherein In step S200, the stamping pressure is set to be greater than 250t.

3. The aluminum forming method for preventing oxidation and color difference according to claim 1, characterized in that, In step S200, the time for simultaneous extrusion and stamping is set to 15s-60s.

4. The method of claim 1 to 3, wherein Before step S200, the following steps are also included: S100, preparing the initial blank and performing initial treatment on the initial blank.

5. The method of claim 4, wherein Step S100 includes the following steps: S110. Cut the aluminum material into the initial blank; S120. Perform a surface treatment on the initial blank; S130. The initial blank after one surface treatment is heated.

6. The method of claim 5, wherein the aluminum material is formed into a shape. Step S120 further includes the following steps: S121. Degreasing: The initial blank is placed in an alkaline degreasing solution or a neutral surfactant for degreasing. S122. Peeling: Immerse the degreased blank in an acidic solution to remove the surface oxide scale. S123. Place the peeled blank into a water tank containing pure water for ultrasonic cleaning. S124. The initial blank after ultrasonic cleaning is washed with water at least three more times.

7. The method of claim 5, wherein the aluminum material is formed by a process selected from the group consisting of extrusion, rolling, drawing, and bending. In step S110, a machining allowance of 2-5 mm is reserved on the surface of the initial blank.

8. The aluminum forming method for preventing oxidation and color difference according to claim 5, characterized in that, The aluminum material is 1050-O state aluminum.

9. The aluminum forming method for preventing oxidation and color difference according to claim 1, characterized in that, Step S200 is followed by the following steps: S300, Cooling and shaping: The molded blank (100) is cooled by air cooling, water cooling or air cooling. S400, fine machining: the cooled blank (100) is finely machined by CNC machining to remove burrs and pits (120) and thus obtain the shaped aluminum material. S500, anodizing of shaped aluminum materials.

10. The method of claim 9, wherein the method is a method of forming an aluminum material into a shape, and the method is a method of forming an aluminum material into a shape while preventing oxidation color difference. Step S500 includes the following steps: S510. Perform secondary surface treatment on the shaped aluminum material; S520, Anodizing, forming an oxide layer with micropores on the surface of the shaped aluminum material.

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