Armored conductive member preparation method and prepared armored conductive member

Abstract

The invention discloses a preparation method of an armored conductive part and the prepared armored conductive part. The preparation method of the armored conductive part comprises the following steps: providing a core material; the method comprises the following steps: continuously extruding an armoring material to obtain an armoring extruded material, extruding the armoring extruded material from an extrusion cavity to form an armoring layer extruded material, enabling a core material to pass through a through hole and penetrate into the formed armoring layer extruded material to obtain an armoring conductive part precursor, suspending the core material in the armoring conductive part precursor, and extruding the core material into the armoring layer extruded material to obtain the armoring conductive part. A first gap is formed between the core material and the armor layer extruded material; providing a reducing die; and reducing the diameter of the armored conductive part precursor through a diameter reducing mold to obtain the armored conductive part. The armor layer is formed on the surface of the insulating layer by adopting an improved continuous extrusion coating method, so that the surface of the armor layer is smoother.

Description

Technical Field

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

[0002] The conductive part is a component with a relatively large cost in the high-voltage connector wire harness of an electric vehicle. The armored insulated conductive part refers to a conductive part 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, a preparation method of the armored layer is as follows: an armored sleeve and an insulated conductive part coated with an insulating layer are respectively prepared, the armored sleeve is sleeved outside the insulated conductive part, and through a drawing device, the armored sleeve is reduced in diameter to eliminate the gap between the armored sleeve and the insulated conductive part, so as to obtain the armored insulated conductive part. 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 part are prepared separately, and making the armored layer closely adhere to the insulating layer through drawing also needs to be carried out separately, and 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 part and the obtained armored conductive part, 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: A preparation method of an armored conductive part includes the following processes: Provide a core material; Continuously extrude the armored material to obtain an armored extruded material; 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 arranged between the outer die and the die core, and the die core is provided with an axial through hole; 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 part precursor is obtained. In the armored conductive part precursor, the core material is suspended in the armored layer extruded material, and a first gap is arranged between the core material and the armored layer extruded material; Provide a reducing die, the reducing die is provided with an extrusion cavity, the inlet size of the extrusion cavity is larger than the outer contour size of the armored layer extruded material, and the outlet size of the extrusion cavity is smaller than the outer contour size of the armored layer extruded material; The precursor of the armored conductive part is reduced in diameter through the diameter-reducing die. During the diameter reduction process, the outer contour size of the armored layer extrusion material becomes smaller, the thickness of the armored layer extrusion material becomes thicker, and the first gap is reduced to the second gap, obtaining the armored conductive part.

[0006] The second technical solution of the present invention is as follows: An armored conductive part is obtained by the above preparation method.

[0007] Implementing the embodiments of the present invention will have the following beneficial effects: In the embodiments of the present invention, an armored layer is formed by an improved continuous extrusion coating method. The existing continuous extrusion coating method directly coats the extrusion material of the continuous extrusion coating layer on the core 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: maintain a safe distance of the first gap between the core material and the closed annular armored layer extrusion material formed by continuous extrusion, and gradually reduce the first gap to the second gap through the diameter-reducing die, so that the temperature of the armored layer extrusion material gradually decreases, protecting the insulating layer.

[0008] In the present invention, the diameter-reducing die 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 the thickness of the coating layer, 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.

[0009] The present invention adopts the continuous extrusion method to achieve continuous production, fully improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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 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, other drawings can be obtained based on these drawings without creative efforts.

[0011] Among them: Figure 1 is a schematic flow chart of the preparation method of the armored conductive part in a specific embodiment of the present invention.

[0012] Figure 2 is a schematic diagram of the preparation method of the armored conductive part in a specific embodiment of the present invention.

[0013] In the figure, 10 is a continuous extruder; 11 is an extrusion wheel; 12 is an extrusion wheel boot; 13 is a plug. 20 is an extrusion die; 30 is a reducing die; 40 is a cooling system; 100 is a core material; 200 is an armored material; 201 is an armored layer extrusion material; 202 is a first gap; 300 is an armored conductive part. Specific embodiments

[0014] 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 belong to the scope of protection of the present invention.

[0015] Reference Figure 1 and Figure 2 , the present invention discloses a preparation method for an armored conductive part 300, including the following processes: 1) Provide a core material 100.

[0016] 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. The extrusion wheel 11 is provided with an extrusion wheel groove, and a plug 13 is arranged 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.

[0017] 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 arranged between the outer die and the die core, and the die core is provided with a through hole along the axis.

[0018] 4) The armored extrusion material is extruded from the extrusion cavity to form an armored layer extrusion material 201, and the core material 100 passes through the through hole and penetrates into the formed armored layer extrusion material 201 to obtain a 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 arranged between the core material 100 and the armored layer extrusion material 201.

[0019] 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.

[0020] 6) Subject the precursor of the armored conductive member to diameter reduction through the diameter reduction die 30. During the diameter reduction process, the outer contour size of the extruded material 201 of the armored layer becomes smaller, the thickness of the extruded material 201 of the armored layer becomes thicker, and the first gap 202 shrinks to the second gap, obtaining the armored conductive member 300.

[0021] The above technical solution forms the armored layer through an improved continuous extrusion coating method. The existing continuous extrusion coating method directly coats the extruded material of the continuous extrusion coating layer on the core 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: maintain a safe distance of the first gap 202 between the core material 100 and the closed annular extruded material 201 of the armored layer formed by continuous extrusion, and gradually reduce the first gap 202 to the second gap through the diameter reduction die 30, so as to gradually lower the temperature of the extruded material 201 of the armored layer and protect the insulating layer.

[0022] In the above technical solution, the diameter reduction die 30 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 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.

[0023] The above technical solution can achieve continuous production by using the continuous extrusion method, fully improving production efficiency.

[0024] 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, but also to facilitate subsequent bending of the armored conductive member 300 and avoid excessive extrusion of the insulating layer at the bending position of the armored layer.

[0025] In the above technical solution, the diameter reduction of the present invention is thermal diameter reduction. The temperature of the extruded material 201 of the armored layer entering the diameter reduction die 30 for diameter reduction is at least 40°C, and the maximum temperature of the extruded material 201 of the armored layer is determined according to the heat resistance that the core material 100 can withstand, and can specifically be 200°C to 300°C.

[0026] 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 can 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 can 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.

[0027] In a specific embodiment, the material of the armor layer is aluminum material, which is light in weight. Specifically, it can be pure aluminum or aluminum alloy. The aluminum alloy of the armor layer is preferably 1 series or 3 series aluminum alloy.

[0028] In a specific embodiment, the conductive core is made of aluminum material, which is light in weight. Preferably, it can be 6 series aluminum alloy, which has excellent electrical conductivity.

[0029] In a specific embodiment, the armored conductive member 300 includes an aluminum conductive core, an insulating layer wrapped around the aluminum conductive core, and an aluminum armor layer wrapped around the insulating layer.

[0030] In a specific embodiment, the armored conductive member 300 includes two or more insulating conductive cores and an aluminum armor layer covering all the insulating conductive cores. The insulating conductive core includes an aluminum conductive core and an insulating layer wrapped around the aluminum conductive core.

[0031] Of course, the material of the armor layer is not limited to aluminum, and other materials such as copper can also be used. The material of the conductive core is not limited to aluminum either, and other materials such as copper and copper-aluminum composite materials can also be used.

[0032] The width of the second gap can be less than or equal to 1.2 mm, or it can 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 that needs to be reserved during 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, and so on.

[0033] 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.

[0034] Further preferably, the armor layer extrudate 201 follows the law of mass conservation or area conservation in the cross-section during the necking process. Therefore, the cross-sectional area of the armor layer extrudate 201 at the exit of the extrusion cavity is equal to the cross-sectional area of the armor layer extrudate 201 at the exit of the extrusion chamber.

[0035] When the armor layer extrudate 201 follows the law of mass conservation or area conservation in the cross-section during the necking process, the following equivalent relationship exists between the cross-sectional dimensions of the armor layer extrudate 201 at the exit of the extrusion cavity and the cross-sectional dimensions of the armor layer extrudate 201 at the exit of the extrusion chamber: When the cross-section of the armor layer extrudate 201 and the cross-section of the core material 100 are both square, When the cross-sections of both the sheathing extrudate 201 and the core material 100 are circular, wherein, and are respectively the lengths of two adjacent sides of the outer contour of the square cross-section of the sheathing extrudate 201 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 sheathing extrudate 201 at the outlet of the extrusion cavity, is the thickness of the sheathing extrudate 201 at the outlet of the extrusion cavity, is the thickness of the sheathing extrudate 201 at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the sheathing extrudate 201 at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross-section of the sheathing extrudate 201 at the outlet of the extrusion cavity.

[0036] When the cross-sections of both the sheathing extrudate 201 and the core material 100 are square, is equal to .

[0037] In the above equation, , , , are the dimensions of the finished armored conductive part 300, which are known quantities. According to the above equation, the dimensions of the sheathing extrudate 201 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.

[0038] In the above technical solution, the force on the sheathing extrudate 201 by the reducing die 30 can all come from the forward extrusion force of the sheathing extrudate 201 during the extrusion process, or a pulling force can be applied to the sheathing extrudate 201 at the outlet end of the reducing die 30 to compensate for the frictional loss of the extrusion force.

[0039] When the cross-section of the core material 100 is square or circular and the sheathing layer is of equal thickness, a pulling force can be uniformly applied to the sheathing extrudate 201.

[0040] When the cross-section of the core material 100 is rectangular and the sheathing layer is of equal thickness, pulling forces are respectively applied to the four sides of the sheathing extrudate 201, and the pulling force applied to the short side of the sheathing extrudate 201 is greater than the pulling force applied to the long side of the sheathing extrudate 201 to avoid different thicknesses of the short side and the long side.

[0041] 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 extruded material 201 of the armored layer, further preventing the high-temperature semi-melt from burning the insulating layer.

[0042] The number of reducing dies 30 is at least one. 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 successively reduces the diameter of the armored 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 armored 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.

[0043] In a specific embodiment, the preparation method of the armored conductive part 300 further includes the following processes: Cooling the armored conductive part 300 online to obtain a cooled armored conductive part; and Segmentally sawing and collecting or winding and collecting the cooled armored conductive part.

[0044] The above technical solution can realize the continuous extrusion production and collection of the armored conductive part, with high automation, saving labor costs and high production efficiency.

[0045] In a specific embodiment, the armored extruded material is obtained by continuously extruding two or more armored materials 200 at the same time, further improving the production efficiency. Specifically, two or more extrusion wheel grooves are arranged side by side on the extrusion wheel 11. Each armored material 200 is respectively conveyed to each extrusion wheel groove for continuous extrusion at the same time. 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. The armored layer extruded materials 201 extruded from each die orifice converge into an annular extrusion cavity.

[0046] In summary, the preparation method of the present invention can realize continuous production, improve production automation and production efficiency.

[0047] The present invention also provides an armored conductive part 300 obtained by the above preparation method, which can obtain an armored layer with a smooth surface.

[0048] 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 deformations 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 method for preparing an armored conductive member, characterized in that: The process includes: Provide core materials; The armor material is continuously extruded to obtain an armor extrudate; An extrusion die is provided, the extrusion die comprising 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 an axial through hole; The armor extrusion material is extruded from the extrusion cavity to form an armor layer extrusion material, and the core material passes through the through hole and penetrates into the molded armor layer extrusion material to obtain an armor conductive member precursor, in which the core material is suspended in the armor layer extrusion material, and a first gap is provided between the core material and the armor layer extrusion material; Providing a diameter reduction die, wherein the diameter reduction die is provided with an extrusion cavity, the inlet size of the extrusion cavity is larger than the outer contour size of the armor layer extrusion material, and the outlet size of the extrusion cavity is smaller than the outer contour size of the armor layer extrusion material; The armored conductive component precursor is reduced in diameter by passing through the reduction die. During the reduction process, the outer contour size of the armor layer extrusion material becomes smaller, the thickness of the armor layer extrusion material becomes thicker, and the first gap is reduced to a second gap, thereby obtaining the armored conductive component.

2. The method for preparing an armored conductive member according to claim 1, characterized in that: The cross-sectional dimension of the armor layer extrusion material at the outlet of the extrusion cavity and the cross-sectional dimension of the armor layer extrusion material at the outlet of the extrusion cavity have the following equivalent relationship: When the cross-section of the armor layer extrusion material and the cross-section of the core material are both square, When the cross-section of the armor layer extrusion material and the cross-section of the core material are both circular, in, and are respectively the lengths of two adjacent sides of the outer contour of the square cross section of the armor layer extrusion material 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 armor layer extrusion material at the outlet of the extrusion chamber, is the thickness of the armor layer extrusion material at the outlet of the extrusion cavity, is the thickness of the armor layer extrusion material at the outlet of the extrusion cavity, is the diameter of the outer contour of the circular cross section of the armor layer extrusion material at the outlet of the extrusion cavity, It is the diameter of the outer contour of the circular cross-section of the armor layer extrusion material at the outlet of the extrusion cavity.

3. The method for preparing an armored conductive member according to claim 1, characterized in that: A tensile force is applied to the armor layer extrudate at the outlet end of the diameter reduction die.

4. The method for preparing an armored conductive member according to claim 3, characterized in that: When the cross section of the core material is rectangular and the armor layer is of equal thickness, tension is applied to the four sides of the armor layer extrusion material respectively, and the tension applied to the short side of the armor layer extrusion material is greater than the tension applied to the long side of the armor layer extrusion material.

5. The method for preparing an armored conductive member 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 down the armor layer extrusion material.

6. The method for preparing an armored conductive member according to claim 1, characterized in that: The armor extrudate is obtained by simultaneously and continuously extruding two or more of the armor materials.

7. The method for preparing an armored conductive member 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 method for preparing an armored conductive member according to claim 1, characterized in that: The number of the diameter-reducing dies is more than two, and each of the diameter-reducing dies reduces the diameter of the armored conductive component precursor in turn.

9. The method for preparing an armored conductive member according to any one of claims 1 to 8, characterized in that: The following processes are also included: The armored conductive member is subjected to online water cooling to obtain a cooled armored conductive member.

10. An armored conductive member, characterized in that: Prepared by the preparation method described in any one of claims 1 to 9.

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