Integrated forming processing method of shielding case with multi-space plane special-shaped structure

Abstract

The invention belongs to the technical field of machining, and particularly relates to an integrated forming machining method of a multi-space plane special-shaped structure shielding case. The method comprises the following steps: expanding a multi-space plane special-shaped structure shielding case mid-difference three-dimensional model into a plane to obtain a plane expansion model of the multi-space plane special-shaped structure shielding case; cutting a plane maximum outline according to the plane expansion model to obtain a multi-space plane special-shaped structure shielding case blank; the V-shaped bending seams and the butt joint edges are machined through three-edge cutter numerical milling of different specifications; the middle of the special-shaped structure shielding case blank obtained after numerical milling is completed is completely attached to the upper surface of a welding tool in the alignment direction, a V-shaped groove faces one side of the welding tool, the welding tool is attached along a bending seam to bend all plane sheet bodies, a multi-space plane special-shaped structure shielding case prototype is formed, and the bent plane sheet bodies are pressed through screws and pressing plates; and when the top faces downwards, all butt joint edge welding seams are automatically welded, and then all bending seams are reinforced and welded.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an integrated forming processing method for a multi-space plane special-shaped structure shielding cover. Background Art

[0002] The function of the shielding cover is to shield the influence of external electromagnetic waves on the internal circuit and the electromagnetic waves generated inside from radiating outward. The material of the shielding cover for aviation is generally soft magnetic alloy. The shape of the traditional shielding cover is mostly square or circular structure. Figure 1a and Figure 1b As shown in the figure, it is assembled (assembled) and welded by multiple rectangular soft magnetic alloy sheets processed by wire cutting or laser cutting. In recent years, there is an urgent need for lightweight and miniaturized aviation products. Various newly developed shielding covers need to tightly envelop the components to be shielded, resulting in a complex structure of shielding covers with multi-space plane special-shaped structures such as Figure 2a and Figure 2b As shown. The soft magnetic alloy spatial plane sheets that make up the shielding cover are not only rectangular, but also include irregular polygons, such as pentagons and hexagons. It is very difficult to accurately prepare such soft magnetic alloy plane sheets; in addition, it is very difficult to accurately assemble these irregular polygonal soft magnetic alloy plane sheets in appropriate positions for sub-millimeter precision welding. It is necessary to reserve margins around the soft magnetic alloy plane sheets, which will bring difficulties to the accurate alignment and assembly of the edges of the soft magnetic alloy plane sheets. At the same time, after welding, a large amount of manual filing of the butt edges is required to remove the margins reserved around the soft magnetic alloy plane sheets. The cumulative error is large, the processing efficiency is low, the cost is high, and the accuracy and quality of the parts are difficult to guarantee. Therefore, the traditional processing methods of cutting soft magnetic alloy plane sheets, assembling, and welding cannot meet the production and manufacturing of multi-space plane special-shaped structure shielding covers. Summary of the invention

[0003] The purpose of the present invention is to provide an integrated molding and processing method for a multi-space planar special-shaped structure shielding cover, so as to realize high-quality, high-efficiency, low-cost and stable production and manufacturing of the multi-space planar special-shaped structure shielding cover.

[0004] Technical solution:

[0005] Provided is an integrated molding processing method for a multi-space plane special-shaped structure shielding cover, comprising:

[0006] The difference three-dimensional model of the multi-space plane special-shaped structure shielding cover is unfolded to the same plane to obtain the plane unfolding model of the multi-space plane special-shaped structure shielding cover; the plane unfolding model has a V-shaped bending seam and a butt joint edge with an inclined angle; the bending seam is a V-shaped groove, which is used for rotationally bending each plane sheet; the butt joint edge is used to realize the corresponding surfaces to be butt jointed and welded in pairs after bending;

[0007] According to the plane unfolding model, the maximum contour of the cutting plane is obtained to obtain the multi-space plane special-shaped structure shielding cover blank;

[0008] Use three-edged cutters of different specifications to mill V-shaped bending seams and butt edges;

[0009] The middle part of the special-shaped shielding cover blank processed by CNC milling is completely fitted with the upper surface of the welding fixture in the positive direction, with the V-shaped groove facing the side of the welding fixture, and each plane sheet is bent along the bending seam to fit the welding fixture to form a prototype of a multi-space plane special-shaped shielding cover, and the bent plane sheet is pressed with screws and pressing plates;

[0010] Automatically weld the butt edge welds from top to bottom, and then reinforce the welding of the bending seams.

[0011] Furthermore, the difference 3D model of the multi-space plane special-shaped structure shielding cover is unfolded to the same plane, including:

[0012] Through the combined planes between the spatial planes, the various special-shaped planes are split into separate plane slices.

[0013] The plane sheet is rotated by a certain angle with the corresponding bending seam edge on the outer side of the plane sheet as the rotation axis to unfold the plane sheet;

[0014] All plane sheets of the multi-space planar special-shaped structure shielding cover are split and unfolded one by one to form a plane unfolding model of the multi-space planar special-shaped structure shielding cover.

[0015] Furthermore, the triangular knife is composed of three planes, and the intersection of the three planes forms a cutting edge; the cutting edge is a negative rake angle; and the tip of the knife is ground into a plane with a diameter of φ0.14 mm.

[0016] Furthermore, the V-groove angle is 45 degrees, and the tip angle of the triangular knife for processing the bending seam is 60 degrees.

[0017] Furthermore, the butt joint edge forms an inclined surface at a certain angle with the upper and lower surfaces of the planar unfolded model, and the triangular cutter for processing the butt joint edge is designed according to the angle of the inclined surface.

[0018] Furthermore, after the V-groove is processed, the minimum wall thickness at the bottom of the groove is 0.06 mm.

[0019] Further, the aluminum circular tooling includes: an aluminum circular jig, a steel screw, a pressure plate, a positioning table, screws and a circular strong magnet;

[0020] A steel screw is fixed on the center of the aluminum circular mold slightly below the upper surface, and screw holes corresponding to the positions and numbers of the plane sheets are arranged along the circumference of the upper surface of the aluminum circular mold; the positioning holes and positioning platform of the multi-space planar special-shaped structure shielding cover blank cooperate to achieve positioning, and the multi-space planar special-shaped structure shielding cover blank is pressed on the upper surface of the aluminum circular mold by the suction force between the steel screw and the circular strong magnet; the outer periphery of the multi-space planar special-shaped structure shielding cover blank is pressed against the upper surface of the aluminum circular mold by screws and screw holes.

[0021] Furthermore, the multi-space plane special-shaped structure shielding cover blank is cut by wire cutting or laser cutting.

[0022] Beneficial effect: The invention improves the traditional square or round structure shielding cover processing method that is completed by assembling (shaping) and welding rectangular soft magnetic alloy sheets into an integrated forming and welding processing method for multi-space planar special-shaped structure shielding covers. Through tools, tooling, equipment, and CNC machining, the shielding cover is automatically manufactured and formed, manual operations are reduced, and the influence of human factors is reduced, thereby realizing high-quality, efficient, low-cost, and stable production of multi-space planar special-shaped structure shielding covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1a It is a schematic diagram of a traditional square structure shielding cover of the present invention.

[0024] Figure 1b It is a schematic diagram of a traditional circular structure shielding cover of the present invention.

[0025] Figure 2a It is a schematic diagram of the multi-space plane special-shaped structure shielding cover of the present invention.

[0026] Figure 2b It is a schematic diagram of the multi-space plane special-shaped structure shielding cover of the present invention.

[0027] Figure 3a It is a schematic diagram of the disassembly of the plane sheet of the multi-space plane special-shaped structure shielding cover of the present invention.

[0028] Figure 3b It is a schematic diagram of the expansion of the plane sheet of the multi-space plane special-shaped structure shielding cover of the present invention.

[0029] Figure 4 It is a schematic diagram of the overall plane unfolding model of the multi-space plane special-shaped structure shielding cover of the present invention.

[0030] Figure 5a It is a self-made triangular knife schematic diagram 1 of the present invention.

[0031] Figure 5b It is a self-made triangular knife schematic diagram 2 of the present invention.

[0032] Figure 6It is a schematic diagram of the aluminum circular numerical milling tooling of the present invention.

[0033] Figure 7 It is a schematic diagram of the positioning and clamping of the multi-space plane special-shaped structure shielding cover blank according to the present invention.

[0034] Figure 8 It is a schematic diagram of the welding forming tooling of the present invention.

[0035] Fig. 9 It is a schematic diagram of the alignment and fitting of the middle sheet of the shielding cover blank and the upper surface of the welding tooling of the present invention.

[0036] Fig.10 It is a schematic diagram of positioning and clamping the multi-space plane special-shaped structure shielding cover of the present invention on the welding tool. DETAILED DESCRIPTION

[0037] The present invention provides an integrated forming processing method for a multi-space plane special-shaped structure shielding cover, comprising:

[0038] 1. Expand the multi-space plane special-shaped structure shielding cover into an overall plane model for the preparation of blanks. Figure 3a , Figure 3b and Figure 4 As shown, the unfolding method is: using the difference three-dimensional model of the multi-space plane special-shaped structure shielding cover, each special-shaped plane is split into separate plane sheets by combining the planes between the space planes, and then the plane sheet is rotated by a certain angle with the corresponding edge (bending seam edge) on the outer side of the plane sheet as the rotation axis, and the plane sheet is unfolded, and the splitting and unfolding of all the plane sheets of the multi-space plane special-shaped structure shielding cover are completed one by one to form the overall plane unfolding model of the multi-space plane special-shaped structure shielding cover.

[0039] 2. Use wire cutting or laser cutting to complete the plane shape processing of the multi-space plane special-shaped structure shielding cover blank contour according to the maximum plane contour of the plane unfolded model.

[0040] 3. There are bending seams and butt joints on the plane unfolding model of the multi-space plane special-shaped structure shielding cover. The bending seam is a V-shaped groove, which is used to rotate and bend each plane sheet, and the butt joint is used to realize the corresponding surfaces to be butt jointed and welded after bending.

[0041] 4. According to the angles of the bending seam and the butt edge, design a homemade triangular cutter for milling the bending seam and the butt edge. Figure 5a and Figure 5bAs shown in the figure, the homemade triangular knife is composed of three planes, and the intersection of the three planes forms the cutting edge. The homemade triangular knife has a simple structure, the cutting edge is a negative rake angle, it is not easy to break during processing, the tool has good strength and is not easy to break, it is easy to sharpen after wear, the tool cost is very low, and the tool angle can be freely designed in a large range. In order to improve the durability of the homemade triangular knife, improve the cutting performance of the tip, and avoid tip collapse, the tip is ground to a plane with a diameter of φ0.14mm.

[0042] 5. During the CNC milling process, position the bottom surface of the cut multi-space plane special-shaped shielding cover blank on the aluminum circular tooling ( Figure 6-10 ) surface, two oblong grooves cooperate with the oblong bosses on the tooling for angular positioning, and eight pressure plates press the eight protruding edges respectively. A steel screw is fixed slightly below the upper surface of the tooling center, and a strong circular magnet is adsorbed on the middle of the upper surface of the blank. The magnetic attraction between the magnet and the steel screw presses the center of the blank to ensure that the center of the bottom surface of the blank fits tightly with the upper surface of the tooling during processing.

[0043] 6. The angle of the V-groove of the bending seam is 45°. After processing, the minimum wall thickness of the bottom of the groove is 0.06mm, which is used to connect the plane sheets and accurately maintain the relative positions between the plane sheets. A homemade 60° triangular cutter is used to process a 45° V-shaped bending seam to reduce the interference of the plane sheets when bending along the bending seam. The NC processing program of the bending seam is driven by the bottom line of the V-groove. The butt joint edge is an inclined surface that forms a certain angle with the upper and lower surfaces of the plane unfolding model of the multi-space plane special-shaped structure shielding cover. According to the inclination angle, a homemade triangular cutter is designed to process the butt joint edge, and the NC processing program of the butt joint edge is driven by each inclined surface.

[0044] 7. Design welding forming tooling based on the inner surface of the differential three-dimensional model of the multi-space plane special-shaped structure shielding cover, and completely fit the middle plane sheet of the special-shaped structure shielding cover blank processed by CNC milling with the upper surface of the welding tooling in the positive direction, with the V-shaped groove facing the side of the welding tooling, and bend each plane sheet along the bending seam to fit the welding tooling to form the prototype of the multi-space plane special-shaped structure shielding cover, and press each plane sheet with screws and pressure plates. Design the welding procedure, first automatically weld the welds of each butt joint from top to bottom, and then reinforce and weld each bending seam.

[0045] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An integrated molding method for a multi-space plane special-shaped structure shielding cover, characterized in that: include: The difference three-dimensional model of the multi-space plane special-shaped structure shielding cover is unfolded to the same plane to obtain the plane unfolding model of the multi-space plane special-shaped structure shielding cover; the plane unfolding model has a V-shaped bending seam and a butt joint edge with an inclined angle; the bending seam is a V-shaped groove, which is used for rotationally bending each plane sheet; the butt joint edge is used to realize the corresponding surfaces to be butt jointed and welded in pairs after bending; According to the plane unfolding model, the maximum contour of the cutting plane is obtained to obtain the multi-space plane special-shaped structure shielding cover blank; Use three-edged cutters of different specifications to mill V-shaped bending seams and butt edges; The middle part of the special-shaped shielding cover blank processed by CNC milling is completely fitted with the upper surface of the welding fixture in the positive direction, with the V-shaped groove facing the side of the welding fixture, and each plane sheet is bent along the bending seam to fit the welding fixture to form a prototype of a multi-space plane special-shaped shielding cover, and the bent plane sheet is pressed with screws and pressing plates; Automatically weld the butt edge welds from top to bottom, and then reinforce the welding of the bending seams.

2. The method according to claim 1, characterized in that Expand the difference 3D model of the multi-space plane special-shaped structure shielding cover to the same plane, including: Through the combined planes between the spatial planes, the various special-shaped planes are split into separate plane slices. The plane sheet is rotated by a certain angle with the corresponding bending seam edge on the outer side of the plane sheet as the rotation axis to unfold the plane sheet; All plane sheets of the multi-space planar special-shaped structure shielding cover are split and unfolded one by one to form a plane unfolding model of the multi-space planar special-shaped structure shielding cover.

3. The method according to claim 2, characterized in that The triangular knife is composed of three planes, and the intersection of the three planes forms the cutting edge; the cutting edge is a negative rake angle; the tip of the knife is ground to a plane with a diameter of φ0.14mm.

4. The method according to claim 3, characterized in that The V-groove angle is 45°, and the tip angle of the triangular knife for processing the bending seam is 60 degrees.

5. The method according to claim 3, characterized in that: The butt joint edge is an inclined surface at a certain angle to the upper and lower surfaces of the flat unfolded model, and the triangular cutter for processing the butt joint edge is designed according to the angle of the inclined surface.

6. The method according to claim 4, characterized in that After the V-groove is processed, the minimum wall thickness at the bottom of the groove is 0.06mm.

7. The method according to claim 1, characterized in that The aluminum circular tooling comprises: an aluminum circular mold (3), a steel screw (4), a pressure plate (5), a positioning table (6), a screw (7) and a circular strong magnet (9); A steel screw (4) is fixed to the center of the aluminum circular jig (3) slightly below the upper surface, and screw holes corresponding to the positions and numbers of the plane sheets are arranged along the circumference of the upper surface of the aluminum circular jig (3); the positioning holes of the blank of the multi-space plane special-shaped structure shielding cover cooperate with the positioning platform (6) to achieve positioning, and the blank of the multi-space plane special-shaped structure shielding cover is pressed on the upper surface of the aluminum circular jig (3) by the suction force between the steel screw (4) and the circular strong magnet (9); the outer periphery of the blank of the multi-space plane special-shaped structure shielding cover is pressed on the upper surface of the aluminum circular jig (3) by the screw (7) and the screw hole.

8. The method according to claim 1, characterized in that The multi-space plane special-shaped structure shielding cover blank is cut by wire cutting or laser cutting.

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