Manufacturing method of shell part

Abstract

The invention relates to the technical field of part manufacturing, in particular to a shell part manufacturing method which comprises the following steps: S1, determining the unfolded shape of a part: dividing the part by taking edges at two ends of the part as dividing lines, and then unfolding the part to obtain the unfolded shape of the part; s2, blanking is conducted, specifically, blanking is conducted in a laser cutting mode according to the unfolding shape determined in the step S1, and during blanking, laser cuts through holes in the left side wall and the bottom wall of the part and cuts a U-shaped groove in the rear side wall of the part; s3, bending forming is conducted, specifically, bending forming is conducted on the plate obtained in the step S2; s4, a welding program is determined, specifically, a welding curve is designed in the program, and welding parameters are determined; s5, laser welding is conducted, specifically, laser welding is conducted on the butt joint portion of the two adjacent side walls according to the welding procedure; s6, a bench worker repairs and files welding scars; and S7, plating, packaging and warehousing. According to the manufacturing method, the machining procedures are greatly simplified, and the defects existing in a stamping and stretching forming method in the prior art are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of parts manufacturing, and in particular to a method for manufacturing a shell part. Background Art

[0002] Combination Figure 1 The schematic diagram of the structure of the shell part is shown in FIG. The part is in the shape of an open thin-walled box, and the material is aluminum alloy 5A06 with a thickness of 0.8 mm. The traditional processing and manufacturing process adopts sheet metal stamping and stretching.

[0003] However, the traditional stamping and stretching forming method has the following problems:

[0004] (1) It is necessary to design a special mold for stamping, the mold structure is complex, and the mold manufacturing cost is high.

[0005] (2) There are multiple through holes on the left side wall and bottom wall of the part, and a U-shaped notch is also provided on the rear side wall of the part. If the traditional processing method is used, the through holes on the bottom wall need to be punched out, which makes the mold structure complicated. Moreover, the through holes on the left side wall and the U-shaped notch on the rear side wall cannot be punched out after stretching, and it is necessary to separately add the drilling process of the left side wall and the process of milling the U-shaped notch on the rear side wall.

[0006] (4) During stamping and stretching, the edges at both ends ( Figure 1 Wrinkles are likely to form at point E in the middle, causing parts to fail. Summary of the invention

[0007] The main purpose of the present invention is to provide a method for manufacturing a housing part, aiming to solve the above technical problems.

[0008] To achieve the above object, the present invention provides a method for manufacturing a housing part, comprising the following steps:

[0009] S1. Determine the unfolded shape of the part: Use the edges at both ends of the part as dividing lines, split the part and unfold it to obtain the unfolded shape of the part;

[0010] S2, blanking: according to the unfolded shape determined in step S1, blanking is performed by laser cutting. When blanking, the laser cuts through holes on the left side wall and the bottom wall of the part, and cuts a U-shaped groove on the rear side wall of the part;

[0011] S3, bending and forming: bending and forming the sheet material obtained in step S2;

[0012] S4. Determine welding procedure: design welding curve and determine welding parameters in the procedure;

[0013] S5. Laser welding: Laser-weld the butt joints of adjacent side walls according to the welding procedure.

[0014] S6. Fitter filing and repairing welding scars.

[0015] S7. Plating, encapsulating and warehousing.

[0016] Preferably, the welding curve includes a start-end extension section, a welding section, and an end-end extension section; the welding section is used to weld the butt joints of adjacent side walls on the part; the start-end extension section and the end-end extension section on the welding curve are used to keep the welding torch running empty.

[0017] Preferably, the length of the start-end extension section is not less than 15 mm, and the length of the end-end extension section is not less than 20 mm.

[0018] Preferably, in the step S4, the welding parameters are: welding power is 310 W - 350 W, and welding speed is 4 mm / s - 12 mm / s.

[0019] Preferably, in the welding curve, the welding parameters corresponding to the start-end extension section are: welding power 350 W, welding speed 4 mm / s; the welding parameters corresponding to the welding section are: welding power 330 W, welding speed 8 mm / s; the welding parameters corresponding to the end-end extension section are: welding power 310 W, welding speed 12 mm / s.

[0020] Preferably, in the step 5, when performing laser welding, the angle between the laser and the weld seam is 45° - 50°.

[0021] Preferably, in the step 5, when performing laser welding, argon is introduced for gas protection.

[0022] Preferably, in the step 5, before performing laser welding, pickling should be carried out first to remove the oxide film and oil stain at the welding part.

[0023] Preferably, in the step S7, EP·(Ni)b10 is used for plating.

[0024] Preferably, in the step S7, when encapsulating and warehousing, the parts are individually encapsulated with EPE.

[0025] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0026] (1) By adopting the manufacturing method provided by the present invention, laser cutting is used for blanking. While blanking, through holes on the left side wall and bottom wall of the part are cut out, and a U-shaped groove on the rear side wall of the part is cut out, and then it is bent and formed and welded. This manufacturing method greatly simplifies the processing procedure and overcomes the deficiencies existing in the prior art using the stamping and stretching forming method.

[0027] (2) In the present invention, when laser welding is performed, the angle between the laser and the weld seam is 45° to 50°, effectively reducing the reflectivity of the weld seam to the laser, increasing the absorptivity of the weld seam to the laser, ensuring good fusion of the weld seam, and thus ensuring the continuity of the weld seam.

[0028] (3) In the present invention, the welding curve includes a start-end extension section, a welding section, and an end-end extension section. The start-end extension section and the end-end extension section are used to keep the welding torch running empty. In addition, different welding parameters are adopted for the three sections on the welding curve. By coordinating the welding power and the welding speed, as the welding energy increases, the welding power is reduced and the welding speed is increased, thereby ensuring the continuity of the weld seam, the uniformity of the weld bead, the firmness of the weld seam, avoiding the cracking phenomenon of the weld seam at the opening part, and being beneficial to ensuring that the inner weld seam is flush with the inner cavity side wall and the outer weld seam is flush with the outer side wall.

[0029] (4) In the present invention, the welding power is 310 - 350W, which not only ensures sufficient fusion of the weld seam and small deformation, but also ensures the welding strength, thereby reducing the large labor intensity of subsequent benchwork for filing the weld bead and improving the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is a schematic structural diagram of a housing part;

[0032] Figure 2 It is a flowchart of the manufacturing method of the housing part provided by the present invention;

[0033] Figure 3 It is a schematic diagram of a sheet material obtained by laser cutting and blanking;

[0034] Figure 4 It is a schematic diagram of the welding curve in the present invention;

[0035] Figure 5 It is a schematic diagram of the welding effect without using a three-stage welding curve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0038] Combined with Figure 1 Shown is a schematic structural diagram of a housing part. The part is in the shape of an open thin-walled box, made of aluminum alloy 5A06, and has a thickness of 0.8 mm.

[0039] Combined with Figures 2 to 4 Shown is a specific embodiment of a manufacturing method for a housing part provided by the present invention. The manufacturing method includes the following steps:

[0040] S1. Determine the unfolded shape of the part: Use the edges at both ends of the part as the dividing lines, divide the part and then unfold it to obtain the unfolded shape of the part. That is, divide and unfold along the edge where point E is located in Figure 1 to obtain the unfolded shape diagram of the part.

[0041] S2. Blanking: According to the unfolded shape determined in step S1, use laser cutting for blanking. When blanking, laser cut the through holes on the left side wall and the bottom wall of the part, and cut out the U-shaped groove on the rear side wall of the part; the obtained sheet material after blanking is as shown in Figure 3 shown.

[0042] S3. Bending and forming: Bend and form the sheet material obtained in step S2;

[0043] S4. Determine the welding procedure: Design the welding curve and determine the welding parameters in the program;

[0044] S5. Laser welding: According to the welding procedure, perform laser welding on the butt joints of adjacent side walls;

[0045] S6. Fitter file the welding scars;

[0046] S7. Plating, encapsulation and warehousing.

[0047] Before laser welding, pickling should be carried out first to remove the oxide film and oil stain at the welding part, which is beneficial to improving the weld quality.

[0048] In the step S7, plating is carried out using EP·(Ni)b10. When encapsulating and warehousing in the step S7, the parts are individually encapsulated using pearl cotton.

[0049] Combined with Figure 4 As shown, in this embodiment, the welding curve includes a starting end extension section, a welding section, and an ending end extension section; the welding section is used to weld the butt joint parts of adjacent two side walls of the part; the starting end extension section and the ending end extension section on the welding curve are used to keep the welding torch running empty. Specifically, the length of the starting end extension section is not less than 15 mm, and the length of the ending end extension section is not less than 20 mm. In Figure 4 it, the DC section represents the starting end extension section; point C represents the starting point of welding; point B represents the ending point of welding; the CB section represents the welding section; the BA section represents the ending end extension section. Specifically, the length of the DC section is 15 mm, and the length of the BA section is 20 mm. The CB section represents the welding section. When welding, it corresponds to Figure 1 the edge shown as cb on the part in

[0050] In this embodiment, in the step S4, the welding parameters are: the welding power is 310 W to 350 W, and the welding speed is 4 mm / s to 12 mm / s. Specifically, in the welding curve, the welding parameters corresponding to the starting end extension section (DC section) are: the welding power is 350 W, and the welding speed is 4 mm / s; the welding parameters corresponding to the welding section (CB section) are: the welding power is 330 W, and the welding speed is 8 mm / s; the welding parameters corresponding to the ending end extension section (BA) are: the welding power is 310 W, and the welding speed is 12 mm / s.

[0051] Combined with Figure 5 As shown, if the welding curve does not adopt a three-section curve structure, that is, when directly welding the welding gun to the part to be welded without running empty before and after welding, problems are likely to occur such as uneven weld beads, the weld beads increasing from the starting point to the ending point of welding, resulting in high labor intensity and low efficiency for subsequent fitters to file the weld beads, and it is not easy to ensure that the inner weld is flush with the inner cavity side wall and the outer weld is flush with the outer side wall. The reason is that the reflectivity of aluminum alloy laser welding is high and the absorption rate is low, resulting in low welding energy. On the other hand, due to the low starting energy and low starting temperature of welding, the weld fusion force at the starting end of the welding curve is poor and the weld beads are very small; as the welding energy gradually increases and the welding temperature rises, the weld fusion force is enhanced, resulting in the largest weld beads at the ending end of the curve. This is likely to lead to uneven weld beads, the smallest at the starting end and the largest at the ending end; the welding strength at the starting end is low and not firm, and the weld at the ending end is prone to cracking; it is not easy to ensure that the inner weld is flush with the inner cavity side wall and the outer weld is flush with the outer side wall.

[0052] To solve the above problems, in this embodiment, when performing laser welding, the angle between the laser and the weld seam is 45° to 50°. This can effectively reduce the reflectivity of the weld seam to the laser, increase the absorptivity of the weld seam to the laser, ensure good fusion of the weld seam, and make the weld seam continuous. In addition, when performing laser welding, argon gas is introduced for gas protection.

[0053] By designing the welding curve into a three-segment structure, that is, extension segments are provided at both the beginning and the end of the welding segment. Figure 1 As shown, when welding the welding part represented by the cb segment on the part, the welding torch first moves according to the DC segment on the welding curve at a welding power of 350 W and a welding speed of 4 mm / s and moves towards point c on the part. When the welding torch moves to point c on the part, it moves according to the welding segment (CB segment) on the welding curve at a welding power of 330 W and a welding speed of 8 mm / s and moves towards point d on the part. When it moves to point d on the part, the CB segment on the welding curve is completed. Then, it moves according to the BA segment on the welding curve at a welding power of 310 W and a welding speed of 12 mm / s and leaves the part, and thus a weld seam can be completed. Different welding parameters are adopted for the three segments on the welding curve. By coordinating the welding power and the welding speed, as the welding energy increases, the welding power is reduced and the welding speed is increased, so as to ensure that the weld seam is continuous, the weld scar is uniform, the weld seam is firm, avoid the phenomenon of weld cracking at the opening part, and is beneficial to ensuring that the inner weld seam is flush with the inner cavity side wall and the outer weld seam is flush with the outer side wall.

[0054] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for manufacturing a housing part, characterized in that: The steps include: S1. Determine the unfolded shape of the part: Use the edges at both ends of the part as dividing lines, split the part and unfold it to obtain the unfolded shape of the part; S2, blanking: according to the unfolded shape determined in step S1, blanking is performed by laser cutting. When blanking, the laser cuts through holes on the left side wall and the bottom wall of the part, and cuts a U-shaped groove on the rear side wall of the part; S3, bending and forming: bending and forming the sheet material obtained in step S2; S4. Determine welding procedure: design welding curve and determine welding parameters in the procedure; S5. Laser welding: laser welding is performed on the butt joints of the adjacent two side walls according to the welding procedure; S6. Fitter repairs and files weld scars; S7, plating, packaging and storage.

2. A method for manufacturing a housing part according to claim 1, characterized in that: In step 4, the welding curve includes a starting extension section, a welding section, and a terminal extension section; the welding section is used to weld the adjacent two side wall butt joints on the parts; the starting extension section and the terminal extension section on the welding curve are used to keep the welding gun idling.

3. A method for manufacturing a housing part according to claim 2, characterized in that: The length of the starting extension section is not less than 15 mm, and the length of the terminal extension section is not less than 20 mm.

4. A method for manufacturing a housing part according to claim 2, characterized in that: In step S4, the welding parameters are: welding power is 310W to 350W, and welding speed is 4mm / s to 12mm / s.

5. A method for manufacturing a housing part according to claim 4, characterized in that: In the welding curve, the welding parameters corresponding to the starting extension section are: welding power 350W, welding speed 4mm / s; The welding parameters corresponding to the welding section are: welding power 330W, welding speed 8mm / s; The welding parameters corresponding to the end extension section are: welding power 310W, welding speed 12mm / s.

6. A method for manufacturing a housing part according to claim 1, characterized in that: In step 5, during laser welding, the angle between the laser and the weld is 45° to 50°.

7. A method for manufacturing a housing part according to claim 1, characterized in that: In step 5, argon gas is introduced for gas protection during laser welding.

8. A method for manufacturing a housing part according to claim 1, characterized in that: In step 5, before laser welding, pickling is performed to remove the oxide film and oil stains on the welding part.

9. A method for manufacturing a housing part according to claim 1, characterized in that: In the step S7, EP·(Ni)b10 is used for plating.

10. A method for manufacturing a housing part according to claim 1, characterized in that: In step S7, when packaging and warehousing, the parts are individually packaged with pearl cotton.

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