Preparation method of armored conductive part and obtained armored conductive part

Abstract

The present invention discloses a preparation method of an armored conductive part and the obtained armored conductive part. The preparation method of the armored conductive part includes the following processes: providing a core material; continuously extruding an armored material to obtain an armored extrusion material, the armored extrusion material is extruded from an extrusion cavity to form an armored layer extrusion material, the core material passes through a through hole and penetrates into the formed armored layer extrusion material to obtain a precursor of the armored conductive part. In the precursor of the armored conductive part, the core material is suspended in the armored layer extrusion material, and a first gap is provided between the core material and the armored layer extrusion material; providing a reducing die; reducing the diameter of the precursor of the armored conductive part through the reducing die to obtain the armored conductive part. The present invention uses an improved continuous extrusion coating method to form an armored layer on the surface of the insulating layer, making the surface of the armored layer smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of processing conductive components for new energy electric vehicles, and more specifically, to a preparation method of an armored conductive component and the obtained armored conductive component. Background Art

[0002] The conductive component is a component with a relatively large cost in the high-voltage connector wire harness of an electric vehicle. The armored insulated conductive component refers to a conductive component in which an insulating layer and an armored layer are sequentially formed outside the conductor. The main function of the insulating layer is insulation protection to prevent electric leakage, and the main function of the armored layer is electromagnetic shielding to prevent electromagnetic radiation leakage.

[0003] In the prior art, one preparation method of the armored layer is as follows: an armored sleeve and an insulated conductive component coated with an insulating layer are respectively prepared, the armored sleeve is sleeved outside the insulated conductive component, and through a drawing device, the armored sleeve is reduced in diameter to eliminate the gap between the armored sleeve and the insulated conductive component, so as to obtain an armored insulated conductive component. The disadvantages of the above preparation method are: First, the surface of the armored layer is likely to leave axial friction marks, which does not meet the product appearance quality requirements. Second, the armored layer sleeve and the insulated conductive component are prepared separately, and it is also necessary to separately make the armored layer closely adhere to the insulating layer through drawing. The entire preparation process cannot achieve continuous production, resulting in low production efficiency and high cost. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art, and provide a preparation method of an armored conductive component and the obtained armored conductive component, and form a smooth-surface armored layer outside the core material through a continuous extrusion method.

[0005] To achieve the above purpose, the first technical solution of the present invention is as follows:

[0006] A preparation method of an armored conductive component includes the following processes:

[0007] Provide a core material;

[0008] Continuously extrude the armored material to obtain an armored extruded material;

[0009] Provide an extrusion die, the extrusion die includes a die core and an outer die axially sleeved outside the die core, an annular extrusion cavity is provided between the outer die and the die core, and the die core is provided with a through hole along the axis;

[0010] The armored extruded material is extruded from the extrusion cavity to form an armored layer extruded material, the core material passes through the through hole, penetrates into the formed armored layer extruded material, and an armored conductive component precursor is obtained. In the armored conductive component precursor, the core material is suspended in the armored layer extruded material, and a first gap is provided between the core material and the armored layer extruded material;

[0011] A reducing-diameter die is provided. The reducing-diameter die is provided with an extrusion cavity. The inlet size of the extrusion cavity is larger than the outer contour size of the extruded material of the sheathing layer, and the outlet size of the extrusion cavity is smaller than the outer contour size of the extruded material of the sheathing layer.

[0012] The precursor of the armored conductive part is reduced in diameter through the reducing-diameter die. During the diameter reduction process, the outer contour size of the extruded material of the sheathing layer becomes smaller, the thickness of the extruded material of the sheathing layer becomes thicker, and the first gap is reduced to a second gap, obtaining the armored conductive part.

[0013] The second technical solution of the present invention is as follows:

[0014] An armored conductive part is obtained by the above preparation method.

[0015] Implementing the embodiments of the present invention will have the following beneficial effects:

[0016] In the embodiments of the present invention, an improved continuous extrusion coating method is used to form the sheathing layer. The existing continuous extrusion coating method directly coats the extruded material of the coating layer continuously extruded on the core body passing through the through hole of the die core. However, directly coating the high-temperature semi-molten extruded material on the insulating layer will burn the insulating layer. The present invention improves the existing continuous extrusion coating method to: keep a safe distance of a first gap between the core material and the closed annular extruded material of the sheathing layer formed by continuous extrusion, and gradually reduce the first gap to a second gap through a reducing-diameter die, so that the temperature of the extruded material of the sheathing layer gradually decreases, protecting the insulating layer.

[0017] In the present invention, the reducing-diameter die still extrudes semi-molten extruded material. The extruded material follows the law of mass conservation or area conservation on the cross-section during the diameter reduction process. Therefore, the reduction of the outer contour size of the coating layer is converted into an increase in the thickness of the coating layer, gradually eliminating the gap between the coated sheathing layer and the insulating layer, completing the coating of the sheathing layer, and obtaining a smooth surface of the sheathing layer. The present invention does not, as in the prior art, reduce the cross-sectional area and increase the length of the solid sheathing layer by drawing, so friction marks can be avoided on the sheathing layer.

[0018] The present invention adopts a continuous extrusion method, which can realize continuous production and fully improve production efficiency. Description of the Drawings

[0019] 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 description in 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, other drawings can be obtained based on these drawings without creative efforts.

[0020] Among them:

[0021] Figure 1 It is a schematic flow chart of the preparation method of the armored conductive part according to a specific embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the preparation method of the armored conductive part according to a specific embodiment of the present invention.

[0023] In the figure, 10 is a continuous extruder; 11 is an extrusion wheel; 12 is an extrusion wheel boot; 13 is a plug.

[0024] 20 is an extrusion die; 30 is a reducing die; 40 is a cooling system;

[0025] 100 is a core material;

[0026] 200 is an armored material; 201 is an armored layer extrusion material; 202 is a first gap;

[0027] 300 is an armored conductive part. Specific embodiments

[0028] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Refer to Figure 1 and Figure 2 , the present invention discloses a preparation method of an armored conductive part 300, including the following processes:

[0030] 1) Provide a core material 100.

[0031] 2) Continuously extrude the armored material 200 to obtain an armored extrusion material. Specifically, the armored material 200 is continuously extruded through a continuous extruder 10. The continuous extruder 10 includes an extrusion wheel 11 and an extrusion wheel boot 12. An extrusion wheel groove is provided on the extrusion wheel 11, and a plug 13 is provided at a position corresponding to the extrusion wheel groove on the extrusion wheel boot 12. The extrusion wheel groove, the plug 13 and the extrusion wheel boot 12 form an extrusion cavity, and the extrusion cavity is provided with a die orifice. The armored material 200 enters the extrusion wheel groove and is continuously extruded in the extrusion cavity to form an armored extrusion material, and the armored extrusion material is extruded from the die orifice.

[0032] 3) Provide an extrusion die 20. The extrusion die 20 includes a die core and an outer die axially sleeved outside the die core. An annular extrusion cavity is provided between the outer die and the die core, and the die core is provided with a through hole along the axis.

[0033] 4) The armored extrusion material is extruded from the extrusion cavity to form the armored layer extrusion material 201. The core material 100 passes through the through hole and penetrates into the formed armored layer extrusion material 201 to obtain the precursor of the armored conductive part. In the precursor of the armored conductive part, the core material 100 is suspended in the armored layer extrusion material 201, and a first gap 202 is provided between the core material 100 and the armored layer extrusion material 201.

[0034] 5) Provide a reducing die 30. The reducing die 30 is provided with an extrusion cavity. The inlet size of the extrusion cavity is larger than the outer contour size of the armored layer extrusion material 201, and the outlet size of the extrusion cavity is smaller than the outer contour size of the armored layer extrusion material 201.

[0035] 6) The precursor of the armored conductive part is reduced in diameter through the reducing die 30. During the diameter reduction process, the outer contour size of the armored layer extrusion material 201 becomes smaller, the thickness of the armored layer extrusion material 201 becomes thicker, and the first gap 202 is reduced to a second gap to obtain the armored conductive part 300.

[0036] The above technical solution forms the armored layer through an improved continuous extrusion coating method. The existing continuous extrusion coating method directly coats the continuously extruded coating layer extrusion material on the core body passing through the through hole of the die core. However, directly coating the high-temperature semi-molten extrusion material on the insulating layer will burn the insulating layer. The present invention improves the existing continuous extrusion coating method to: keep a safe distance of the first gap 202 between the core material 100 and the closed annular armored layer extrusion material 201 formed by continuous extrusion, and gradually reduce the first gap 202 to the second gap through the reducing die 30, so that the temperature of the armored layer extrusion material 201 gradually decreases to protect the insulating layer.

[0037] In the above technical solution, the reducing die 30 still extrudes the semi-molten extrusion material. The extrusion material follows the law of mass conservation or area conservation on the cross-section during the diameter reduction process. Therefore, the reduction of the outer contour size of the coating layer is converted into the increase of its thickness, gradually eliminating the gap between the coated armored layer and the insulating layer, completing the coating of the armored layer, and obtaining a smooth surface of the armored layer. The present invention does not, as in the prior art, reduce the cross-sectional area and increase the length of the solid armored layer by drawing, so friction marks can be avoided on the armored layer.

[0038] The above technical solution can realize continuous production by adopting the continuous extrusion method, fully improving the production efficiency.

[0039] In the above technical solution, the purpose of setting the second gap is not only to minimize the burning of the insulating layer by the high-temperature semi-melt as much as possible, but also to facilitate the subsequent bending of the armored conductive part 300 and avoid excessive extrusion of the insulating layer at the bending part of the armored layer.

[0040] In the above technical solution, the diameter reduction of the present invention is thermal diameter reduction. The temperature of the sheathed layer extrusion material 201 entering the diameter reduction die 30 for diameter reduction is at least 40°C, and the maximum temperature of the sheathed layer extrusion material 201 is determined according to the heat resistance that the core material 100 can withstand, and specifically can be 200°C to 300°C.

[0041] In a specific embodiment, the core material 100 includes a conductive core and an insulating layer coated on the surface of the conductive core; the conductive core is a metal conductor material. In other embodiments, the coating layer is not limited to one layer, and may also include two or more coating layers, and the material of the coating layer can be any material, such as an insulating layer, a conductor layer, etc. The core material 100 may also be two or more insulated conductor cores, where the insulated conductor core includes a conductive core and an insulating layer coating the conductive core.

[0042] In a specific embodiment, the material of the sheathed layer is aluminum material, which is light in weight, specifically pure aluminum or aluminum alloy, and the aluminum alloy of the sheathed layer is preferably 1-series or 3-series aluminum alloy.

[0043] In a specific embodiment, the conductive core is aluminum material, which is light in weight, preferably 6-series aluminum alloy, and has excellent electrical conductivity.

[0044] In a specific embodiment, the armored conductive part 300 includes an aluminum conductive core, an insulating layer coated outside the aluminum conductive core, and an aluminum sheathed layer coated outside the insulating layer.

[0045] In a specific embodiment, the armored conductive part 300 includes two or more insulated conductor cores and an aluminum sheathed layer coating all the insulated conductor cores, and the insulated conductor core includes an aluminum conductive core and an insulating layer coated outside the aluminum conductive core.

[0046] Of course, the material of the sheathed layer is not limited to aluminum, and may also be other materials such as copper, and the material of the conductive core is not limited to aluminum, and may also be other materials such as copper, copper-aluminum composite material, etc.

[0047] The width of the second gap can be less than or equal to 1.2 mm, or can also be 0. The width of the second gap is related to the shape and size of the product. The larger the size of the product, the larger the gap to be reserved when bending. Specifically, for products with a size of 5 - 15 mm, the gap is less than 0.5 mm; for products with a size of 15 - 25 mm, the gap is less than 0.8 mm; for products with a size of 25 - 35 mm, the gap is less than 1.2 mm, etc.

[0048] The size of the first gap is preferably 10 mm to 1 mm, and the minimum value of the first gap can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc.

[0049] Further preferably, the extruded material 201 of the armor layer follows the law of mass conservation or area conservation in the cross-section during the diameter reduction process. Therefore, the cross-sectional area of the extruded material 201 of the armor layer at the outlet of the extrusion cavity is equal to the cross-sectional area of the extruded material 201 of the armor layer at the outlet of the extrusion cavity.

[0050] When the extruded material 201 of the armor layer follows the law of mass conservation or area conservation in the cross-section during the diameter reduction process, the following equivalent relationship exists between the cross-sectional dimensions of the extruded material 201 of the armor layer at the outlet of the extrusion cavity and the cross-sectional dimensions of the extruded material 201 of the armor layer at the outlet of the extrusion cavity:

[0051] When the cross-sections of both the extruded material 201 of the armor layer and the core material 100 are square,

[0052]

[0053] When the cross-sections of both the extruded material 201 of the armor layer and the core material 100 are circular,

[0054]

[0055] Wherein, and are respectively the lengths of two adjacent sides of the outer contour of the square cross-section of the extruded material 201 of the armor layer at the outlet of the extrusion cavity, and are respectively the lengths of two adjacent sides of the outer contour of the square cross-section of the extruded material 201 of the armor layer at the outlet of the extrusion cavity, is the thickness of the extruded material 201 of the armor layer at the outlet of the extrusion cavity, is the thickness of the extruded material 201 of the armor layer at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the extruded material 201 of the armor layer at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the extruded material 201 of the armor layer at the outlet of the extrusion cavity.

[0056] When the cross-sections of both the extruded material 201 of the armor layer and the core material 100 are square, is equal to .

[0057] In the above equation, , , , are the dimensions of the finished armored conductive part 300 finally obtained, which are known quantities. According to the above equation, the dimensions of the extruded material 201 of the armor layer at the outlet of the extrusion cavity can be obtained, that is, the dimensions of the sizing belt at the outlet of the extrusion cavity are obtained.

[0058] In the above technical solution, the force of the sheathed layer extrudate 201 passing through the reducing die 30 can all come from the forward extrusion force of the sheathed layer extrudate 201 during the extrusion process, or a tensile force can be applied to the sheathed layer extrudate 201 at the outlet end of the reducing die 30 to compensate for the frictional loss of the extrusion force.

[0059] When the cross-section of the core material 100 is square or circular and the sheathed layer has a uniform thickness, a tensile force can be uniformly applied to the sheathed layer extrudate 201.

[0060] When the cross-section of the core material 100 is rectangular and the sheathed layer has a uniform thickness, tensile forces are respectively applied to the four sides of the sheathed layer extrudate 201, and the tensile force applied to the short side of the sheathed layer extrudate 201 is greater than the tensile force applied to the long side of the sheathed layer extrudate 201, so as to avoid different thicknesses of the short side and the long side.

[0061] In a specific embodiment, a cooling system 40 is arranged between the outlet of the extrusion cavity and the outlet of the extrusion chamber to cool the sheathed layer extrudate 201, further avoiding the insulation layer being burned by the high-temperature semi-melt.

[0062] The number of reducing dies 30 is at least 1. In a specific embodiment, the number of reducing dies 30 is more than two, specifically, it can be 2, 3, 4, 5, etc. Each reducing die 30 sequentially reduces the diameter of the sheathed conductive part precursor. Arranging multiple reducing dies 30 for multi-pass diameter reduction can not only reduce the single deformation amount, reduce surface scratches or cracks, and improve the surface finish, but also is beneficial to preparing a special-shaped sheathed layer structure. By gradually correcting the local deformation error, the dimensional control accuracy of areas such as the corners and grooves of the special-shaped structure is improved, thereby improving the overall dimensional accuracy of the product outer contour.

[0063] In a specific embodiment, the preparation method of the sheathed conductive part 300 further includes the following process:

[0064] Cool the sheathed conductive part 300 online to obtain a cooled sheathed conductive part; and

[0065] Segmentally saw and collect or wind and collect the cooled sheathed conductive part.

[0066] The above technical solution can realize the continuous extrusion production and collection of the sheathed conductive part, with high automation, saving labor costs and high production efficiency.

[0067] In a specific embodiment, the armored extruded material is obtained by continuously extruding two or more armored materials 200 simultaneously, further improving the production efficiency. Specifically, two or more extrusion wheel grooves are arranged in parallel on the extrusion wheel 11, and each armored material 200 is respectively conveyed to each extrusion wheel groove for simultaneous continuous extrusion. Plugs 13 are respectively arranged at positions corresponding to each extrusion wheel groove on the extrusion wheel boot 12. Each extrusion wheel groove corresponds to an independent extrusion cavity and a die orifice, and the armored layer extruded materials 201 extruded from each die orifice converge into an annular extrusion cavity.

[0068] In summary, the preparation method of the present invention can achieve continuous production, improve production automation and production efficiency.

[0069] The present invention also provides an armored conductive part 300, which is obtained by the above preparation method and can obtain an armored layer with a smooth surface.

[0070] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A preparation method of an armored conductive part, characterized in that Including the following processes: Providing a core material; Continuously extruding the sheathing material to obtain a sheathing extrusion; Providing an extrusion die, the extrusion die including a die core and an outer die axially sleeved outside the die core, an annular extrusion cavity being provided between the outer die and the die core, and the die core being provided with a through hole along the axis; The sheathing extrusion is extruded from the extrusion cavity to form a sheathing layer extrusion, the core material passes through the through hole and penetrates into the formed sheathing layer extrusion to obtain a precursor of a sheathed conductive part, in the precursor of the sheathed conductive part, the core material is suspended in the sheathing layer extrusion, and a first gap is provided between the core material and the sheathing layer extrusion; Providing a reducing die, the reducing die being provided with an extrusion cavity, the inlet size of the extrusion cavity being larger than the outer contour size of the sheathing layer extrusion, and the outlet size of the extrusion cavity being smaller than the outer contour size of the sheathing layer extrusion; Subjecting the precursor of the sheathed conductive part to diameter reduction through the reducing die. During the diameter reduction process, the outer contour size of the sheathing layer extrusion becomes smaller, the thickness of the sheathing layer extrusion becomes thicker, and the first gap is reduced to a second gap to obtain the sheathed conductive part.

2. The preparation method of the armored conductive part according to claim 1, characterized in that, The following equivalent relationship exists between the cross-sectional size of the sheathing layer extrusion at the outlet of the extrusion cavity and the cross-sectional size of the sheathing layer extrusion at the outlet of the extrusion cavity: When the cross-sections of both the sheathing layer extrusion and the core material are square, When the cross-sections of both the sheathing layer extrusion and the core material are circular, Wherein, and are respectively the lengths of two adjacent sides of the outer contour of the square cross-section of the armored layer extrudate at the outlet of the extrusion cavity, and are respectively the lengths of two adjacent sides of the outer contour of the square cross-section of the armored layer extrudate at the outlet of the extrusion cavity, is the thickness of the armored layer extrudate at the outlet of the extrusion cavity, is the thickness of the armored layer extrudate at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the armored layer extrudate at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the armored layer extrudate at the outlet of the extrusion cavity.

3. The preparation method of the armored conductive part according to claim 1, characterized in that, Applying a tensile force to the sheathing layer extrusion at the outlet end of the reducing die.

4. The preparation method of the armored conductive part according to claim 3, characterized in that, When the cross-section of the core material is rectangular and the sheathing layer is of equal thickness, tensile forces are respectively applied to the four sides of the sheathing layer extrusion, and the tensile force applied to the short side of the sheathing layer extrusion is greater than the tensile force applied to the long side of the sheathing layer extrusion.

5. The preparation method of the armored conductive part according to claim 1, characterized in that, A cooling system is provided between the outlet of the extrusion cavity and the outlet of the extrusion cavity, and the cooling system cools the sheathing layer extrusion.

6. The preparation method of the armored conductive part according to claim 1, characterized in that, The sheathing extrusion is obtained by continuously extruding two or more of the above-mentioned sheathing materials simultaneously.

7. The manufacturing method of the armored conductive part according to claim 1, characterized in that, The size of the second gap is less than 1.2 mm; The size of the first gap is 1 mm to 10 mm.

8. The preparation method of the armored conductive part according to claim 1, characterized in that, The number of the reducing dies is two or more, and each reducing die successively subjects the precursor of the sheathed conductive part to diameter reduction.

9. The preparation method of the armored conductive part according to any one of claims 1 to 8, characterized in that It further includes the following process: Online water-cooling the sheathed conductive part to obtain a cooled sheathed conductive part.

10. An armored conductive component, characterized in that, Obtained by the preparation method according to any one of claims 1 to 9.

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