Outer water cut core material, bright outer water cut and its manufacturing method

Abstract

The present application discloses an outer water cut core material, a bright outer water cut and a manufacturing method thereof. The outer water cut core material is characterized in that it includes an appearance section and a covering section which are connected by butt welding. The appearance section is made of a first steel strip, and the covering section is made of a second steel strip. One end of the appearance section connected to the covering section is provided with an arc angle, and a straight transition section is provided at the end of the arc angle. The covering section is connected to the straight transition section. The outer water cut core material of the present application is formed by butt welding the appearance section made of the first steel strip and the covering section made of the second steel strip, and it does not need to be entirely made of the high-cost first steel strip. While achieving no decline in appearance performance, it effectively reduces the cost of the outer water cut core material. The straight transition section is provided at the end of the arc angle of the appearance section for butt welding with the covering section, so that the butt welding seam is arranged in the straight transition section, avoiding the butt welding seam being located at the arc angle position and ensuring the connection strength between the appearance section and the covering section.

Description

Technical Field

[0001] This application relates to the technical field of exterior water deflectors, and particularly to an exterior water deflector core material, a bright exterior water deflector, and a manufacturing method thereof. Background Art

[0002] At present, stainless steel exterior water deflectors are installed on the flanges of the waistlines of the outer panels of most vehicle doors, which play the roles of sealing, decoration, and water scraping. In order to improve the appearance effect of the vehicle, bright stainless steel exterior water deflectors are adopted. For this reason, the exterior water deflector skeleton needs to be made of bright steel strips, and the cost of bright steel strips is significantly higher than that of ordinary steel strips, which increases the cost of the exterior water deflector to a certain extent. Summary of the Invention

[0003] The purpose of this application is to overcome the deficiency of the high cost of bright exterior water deflectors in the prior art, and provide an exterior water deflector core material, a bright exterior water deflector, and a manufacturing method thereof that can reduce costs.

[0004] The technical solution of this application provides an exterior water deflector core material, including an appearance section and a covering section connected by butt welding. The appearance section is made of a first steel strip, and the covering section is made of a second steel strip;

[0005] One end of the appearance section connected to the covering section is provided with an arc angle, and a straight transition section is provided at the end of the arc angle. The covering section is connected to the straight transition section.

[0006] Further, the length of the straight transition section is greater than or equal to the allowable tolerance length, and the allowable tolerance length is equal to the sum of half of the width of the heat affected zone of the weld, the rolling tolerance, the steel strip width tolerance, and the welding tolerance.

[0007] Further, the width of the heat affected zone of the weld is 1.2 mm, the rolling tolerance is 0.2 mm, the steel strip width tolerance is 0.1 mm, and the welding tolerance is 0.1 mm.

[0008] Further, a cut is provided on one side of a local area of the exterior water deflector core material where the arc angle is connected to the straight transition section;

[0009] If twice the allowable tolerance length is greater than or equal to the maximum remaining length from the arc angle to the cut, the length of the straight transition section is the sum of the allowable tolerance length and the maximum remaining length;

[0010] If twice the allowable tolerance length is less than or equal to the minimum remaining length from the arc angle to the cut, the length of the straight transition section is the allowable tolerance length.

[0011] The technical solution of the present application also provides a bright outer water cut-off, which includes an outer water cut-off skeleton and a rubber part wrapped around the outer water cut-off skeleton for forming a lip. The outer water cut-off skeleton is made of the outer water cut-off core material as described above, and the outer surface of the appearance section is exposed in the rubber part.

[0012] Further, the end cut of the outer water cut-off skeleton is coated with antirust oil.

[0013] The technical solution of the present application also provides a manufacturing method of the outer water cut-off core material as described above, including

[0014] Controlling the first steel strip and the second steel strip to be fed side by side at the same speed synchronously;

[0015] Controlling the clamping mechanism to press the first steel strip and the second steel strip from both sides and above;

[0016] Controlling the welding mechanism to perform splicing welding on the connection part of the first steel strip and the second steel strip, and at the same time controlling the air blowing mechanism to perform high-pressure air blowing on the welding part;

[0017] Controlling the winding mechanism to wind up the welded outer water cut-off core material.

[0018] Further, before the first steel strip is fed, it further includes

[0019] Controlling the film tearing mechanism to tear off the self-adhesive protective film on the first steel strip;

[0020] Before the control clamping mechanism presses the first steel strip and the second steel strip from both sides and above, it further includes

[0021] Controlling the film pasting mechanism to paste a welding protective film on the first steel strip, and the width of the welding protective film is smaller than the width of the self-adhesive protective film.

[0022] Further, the clamping mechanism includes splicing pressing parts arranged on both sides and a surface difference pressing part arranged above. Controlling the clamping mechanism to press the first steel strip and the second steel strip from both sides and above specifically includes

[0023] Controlling the splicing pressing parts to press from both sides of the first steel strip and the second steel strip;

[0024] Controlling the surface difference pressing part to press from above the first steel strip and the second steel strip.

[0025] The technical solution of the present application also provides a manufacturing method of the bright outer water cut-off as described above, at least including

[0026] Precision cutting the outer water cut-off core material into core material segments of a set length and then roll-pressing them into an outer water cut-off skeleton;

[0027] Controlling the oil coating mechanism to dip antirust oil and then coat it on the end cut of the outer water cut-off skeleton;

[0028] Cover a rubber part on the outer water cut framework.

[0029] After adopting the above technical solution, the following beneficial effects are achieved:

[0030] The outer water cut core material of the present application is formed by butt welding an appearance section made of a first steel strip and a covering section made of a second steel strip. It is not necessary to be entirely made of the high-cost first steel strip. The first steel strip can be a high-brightness steel strip with higher brightness according to the appearance requirements of the outer water cut, and the second steel strip can be a non-bright surface steel strip with qualified strength. While achieving no decline in appearance performance, the cost of the outer water cut core material is effectively reduced;

[0031] A straight transition section is provided at the end of the arc angle of the appearance section for butt welding with the covering section, so that the splicing weld seam is arranged in the straight transition section, avoiding the splicing weld seam being located at the arc angle position and ensuring the connection strength between the appearance section and the covering section. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Referring to the drawings, the disclosure of the present application will become easier to understand. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present application. In the drawings:

[0033] Figure 1 is a sectional view of a bright surface outer water cut in an embodiment of the present application;

[0034] Figure 2 is an enlarged view of the connection part between the appearance section and the covering section in a bright surface outer water cut in an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of a bright surface outer water cut in an embodiment of the present application;

[0036] Figure 4 is Figure 3 a sectional view taken along A-A in

[0037] Figure 5 is a flow chart of a method for manufacturing an outer water cut core material in an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of an assembly line for manufacturing an outer water cut core material;

[0039] Figure 7 is a top view of a pressing mechanism in an assembly line for manufacturing an outer water cut core material in an embodiment of the present application;

[0040] Figure 8 is a front sectional view of a pressing mechanism in an assembly line for manufacturing an outer water cut core material in an embodiment of the present application;

[0041] Figure 9It is a flowchart of the manufacturing method of the bright outer water cut in an embodiment of the present application;

[0042] Figure 10 It is a schematic structural diagram of the oiling mechanism in an embodiment of the present application.

[0043] List of reference numerals in the drawings:

[0044] Outer water cut core 1: appearance section 01, arc angle 11, straight transition section 12, incision 13, covering section 02;

[0045] Rubber part 2;

[0046] First steel strip coil 601, second steel strip coil 602, film tearing mechanism 603, film pasting mechanism 604, clamping mechanism 605, splicing pressing part 651, surface difference pressing part 652, welding mechanism 606, air blowing mechanism 607, winding mechanism 608, outer water cut core coil 609, rotary table frame 610, pressure sensor 611;

[0047] Mechanical gripper 101, oiling manipulator 102, oil box 103, outer water cut skeleton 104. Detailed implementation manners

[0048] The following further describes the detailed implementation manners of the present application with reference to the drawings.

[0049] It is easy to understand that according to the technical solution of the present application, under the condition of not changing the essence of the present application, those of ordinary skill in the art can use various structural forms and implementation manners that can be mutually replaced. Therefore, the following detailed implementation manners and the drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as all of the present application or as a limitation or restriction on the technical solution of the application.

[0050] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and therefore may change accordingly according to their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] Outer water cut core material:

[0053] The outer water cut core material 1 in the embodiment of the present application, as Figure 1 , 2 shown, includes an appearance section 01 and a covering section 02 connected by seam welding. The appearance section 01 is made of a first steel strip, and the covering section 02 is made of a second steel strip;

[0054] One end of the appearance section 01 connected to the covering section 02 is provided with an arc angle 11, and the end of the arc angle 11 is provided with a straight transition section 12, and the covering section 02 is connected to the straight transition section 12.

[0055] Figure 1 shows a cross-sectional view of the outer water cut, in which the skeleton is made of the outer water cut core material 1 in the embodiment of the present application, including an appearance section 01 and a covering section 02. The appearance section 01 is the part of the outer water cut structure exposed to the vehicle body appearance, made of a first steel strip. The first steel strip can use a high-brightness steel strip with higher brightness according to the appearance requirements of the outer water cut to ensure the appearance effect of the outer water cut structure; the covering section 02 is the part of the outer water cut structure hidden inside the vehicle body and covered by a rubber lip. This part is made of a second steel strip. The second steel strip can use an ordinary steel strip with qualified strength, which has a lower cost compared with the high-brightness steel strip. It can not only play a supporting role but also reduce the overall cost of the outer water cut core material 1.

[0056] The appearance section 01 and the covering section 02 are connected by seam welding to keep the thickness at the connection consistent.

[0057] As an example, the appearance section 01 is made of a first steel strip SUS 430MA, and the covering section 02 is made of a second steel strip SUS 430BA.

[0058] As Figure 2 shown, one end of the appearance section 01 connected to the covering section 02 is provided with an arc angle 11, and the end of the arc angle 11 is also connected with a straight transition section 12. The covering section 02 is seam-welded to the end of the straight transition section 12, so that the splicing weld can be located at the straight transition section 12, avoiding the splicing weld being located at the position of the arc angle, resulting in the fracture of the splicing weld during roll forming, thereby ensuring the overall strength of the outer water cut core material 1.

[0059] The external water-cut core material 1 in the embodiment of the present application is formed by welding two types of steel strips, which effectively reduces material costs. At the same time, the overall strength of the external water-cut core material is ensured by setting the position of the splicing weld.

[0060] Furthermore, the length of the straight transition section 12 is greater than or equal to the allowable tolerance length, wherein the allowable tolerance length is equal to the sum of 1 / 2 of the width of the weld heat affected zone, the rolling tolerance, the steel strip width tolerance, and the welding tolerance.

[0061] Specifically, through research and summary of the laser welding process, it was found that the width of the weld heat affected zone is 1.2mm, the rolling tolerance is 0.2mm, the steel strip width tolerance is 0.1mm, and the welding tolerance is 0.1mm. The allowable tolerance length is 1.2 / 2+0.2+0.1+0.1=1mm.

[0062] The weld heat affected zone diffuses from the weld toward both sides, and the straight transition section 12 is provided on one side of the weld. The width of the area actually affected by the weld heat is 1 / 2 of the weld heat affected zone.

[0063] In the embodiment of the present application, the length of the straight transition section 12 is set to be greater than or equal to the allowable tolerance length, and the allowable tolerance length includes the tolerances that may exist in various processes during the external water cutting production process, thereby ensuring that even when the errors of various processes are the largest, the splicing welds can be set on the straight transition section 12.

[0064] Furthermore, if Figure 3 、 4 As shown, a local area of the external water-cut core material 01 is provided with a cutout 13 on one side where the arc corner 11 is connected to the straight transition section 12;

[0065] If twice the allowable tolerance length is greater than or equal to the maximum retained length from the arc angle 11 to the cutout 13, the length of the straight transition section 12 is the sum of the allowable tolerance length and the maximum retained length;

[0066] If twice the allowable tolerance length is less than or equal to the minimum retained length from the arc corner 11 to the cutout 13 , the length of the straight transition section 12 is the allowable tolerance length.

[0067] Specifically, when the external water cut is installed on the vehicle, the end area of the external water cut needs to cut off part of the structure at the rear end of the arc angle to avoid the vehicle body structure, leaving a cut 13. At different positions of the cut on the same external water cut, the retained length L from the end of the arc angle 11 to the cut 13 is not completely consistent, and fluctuates between the minimum retained length and the maximum retained length.

[0068] In order to prevent the incision 13 from staggering the joint weld, the length of the straight transition section 12 can be set according to the retained length from the end of the arc corner 11 to the incision 13.

[0069] Twice the allowable tolerance length is the area where the weld may exist. When twice the allowable tolerance length is greater than or equal to the maximum retention length, it indicates that the cut 13 may coincide with the weld, and then the length of the straight transition section 12 needs to be set to the sum of the allowable tolerance length and the maximum retention length.

[0070] When twice the allowable tolerance length is less than or equal to the minimum retention length, it indicates that the cut 13 cannot coincide with the weld, and the length of the straight transition section 12 is set to the allowable tolerance length, which can avoid the cut 13 from coinciding with the weld.

[0071] The outer water cut core material 1 in the embodiment of the present application effectively reduces the material cost. At the same time, by setting the length of the straight transition section 12, the influence of the splicing weld on the overall strength is avoided, and the structural stability of the outer water cut core material 1 is ensured.

[0072] Bright surface outer water cut:

[0073] The bright surface outer water cut in the embodiment of the present application, as Figure 1 shown, includes an outer water cut skeleton and a rubber part 2 wrapped outside the outer water cut skeleton for forming a lip. The outer water cut skeleton is made of the outer water cut core material 1 described in the foregoing embodiment, and the outer surface of the appearance section 01 is exposed in the rubber part 2.

[0074] The bright surface outer water cut forms a lip by arranging the rubber part 2 on the outer water cut skeleton for realizing the connection and sealing with the vehicle body. The outer surface of the appearance section 01 is a bright surface, and at least part of the bright surface is not covered by the rubber part 2 and is exposed on the surface of the bright surface outer water cut.

[0075] Further, the end cut of the outer water cut skeleton is coated with antirust oil. Specifically, after the outer water cut core material is cut into a set length, it is roll-formed to form the outer water cut skeleton. In order to prevent the end cut of the outer water cut skeleton from rusting, antirust oil is coated on the end cut.

[0076] The bright surface outer water cut in the embodiment of the present application includes the outer water cut core material provided in the foregoing embodiment. Since the bright surface outer water cut in the embodiment of the present application has the same advantages as the outer water cut core material provided in the foregoing embodiment, it will not be elaborated here.

[0077] Manufacturing method of the outer water cut core material:

[0078] The technical solution of the present application also provides a manufacturing method of the outer water cut core material as described above, as Figure 5 shown, including

[0079] Step S501: Control the film tearing mechanism to tear off the self-adhesive protective film on the first steel strip;

[0080] Step S502: Control the first steel strip and the second steel strip to be fed side by side at the same speed synchronously;

[0081] Step S503: Control the film pasting mechanism to paste a welding protective film on the first steel strip, and the width of the welding protective film is smaller than the width of the self - carried protective film;

[0082] Step S504: Control the clamping mechanism to press the first steel strip and the second steel strip tightly from both sides and above;

[0083] Step S505: Control the welding mechanism to perform splicing welding on the connection of the first steel strip and the second steel strip, and at the same time control the air - blowing mechanism to blow high - pressure air at the welding part;

[0084] Step S506: Control the winding mechanism to wind up the welded outer water cut core material.

[0085] The production line of the outer water cut core material is as Figure 6 shown. The first steel strip coil 601 and the second steel strip coil 602 are arranged at the front end of the production line. Among them, the second steel strip coil 602 is directly sent into the conveyor belt by the feeding mechanism, and the first steel strip coil 601 enters the conveyor belt after the self - carried protective film is torn off by the film - tearing mechanism 603. The feeding mechanism includes a rotary table frame 610 and a pressure sensor 611 for driving the first steel strip coil 601 and the second steel strip coil 602 to unwind and feed. The pressure sensor 611 is used to sense the feeding speed of the two coils and feedback to the rotary table frame 610 to adjust the feeding speed of the two coils, so that the two coils can feed synchronously at the same speed.

[0086] The first steel strip coil 601 and the second steel strip coil 602 are conveyed by the conveyor belt to the film pasting mechanism 604. The film pasting mechanism 604 is used to paste a welding protective film on the first steel strip. The welding protective film is used to protect the non - welded area of the first steel strip to avoid scratching it in the subsequent manufacturing steps. The width of the welding protective film is smaller than the width of the self - carried protective film to expose the welding heat - affected zone and prevent the protective film from melting into the weld during welding and affecting the welding strength.

[0087] After film pasting, the first steel strip coil 601 and the second steel strip coil 602 continue to be conveyed to the clamping mechanism 605. As Figure 7 、 8 shown, the clamping mechanism 605 includes splicing pressing parts 651 arranged on both sides of the conveyor belt and surface difference pressing parts 652 arranged above the conveyor belt. Among them, the splicing pressing parts 651 include a number of steel balls installed on both sides of the conveyor belt through elastic parts. The steel balls squeeze the coils on the conveyor belt towards the middle under the elastic force of the elastic parts to eliminate the gap at the splicing of the first steel strip and the second steel strip; the surface difference pressing parts 652 are composed of copper blocks with sponges covered on the lower surface. The copper blocks are installed above the conveyor belt through elastic parts and are pressed on the upper surfaces of the first steel strip coil 601 and the second steel strip coil 602 to ensure zero surface difference between the first steel strip and the second steel strip during welding.

[0088] The welding mechanism 606 is arranged behind the clamping mechanism 605, and laser welding is performed on the splicing part of the first steel strip and the second steel strip at the position output after the clamping mechanism 605 clamps the first steel strip and the second steel strip. At the same time, the air blowing mechanism 607 blows high-pressure air on the welding part to prevent welding slag from splashing and damaging the appearance quality of the core material.

[0089] The welded outer water cut core material is conveyed by a conveyor belt to the winding mechanism 608 and wound up to form an outer water cut core material coil 609.

[0090] The embodiment of the present application provides a manufacturing method for an outer water cut core material formed by welding two materials. For the welding process, steps such as pressing and welding are set, and considering the protection of the surface of the first steel strip and the welding strength, the steps of first tearing the film and then pasting the film are set, ensuring the structural strength and appearance effect of the outer water cut core material.

[0091] Manufacturing method of bright surface outer water cut:

[0092] Figure 9 The flowchart showing the manufacturing method of the bright surface outer water cut in the foregoing embodiment includes at least

[0093] Step S901: Precision cut the outer water cut core material into core material segments of a set length and then roll them into an outer water cut skeleton;

[0094] Step S902: Control the oil coating mechanism to dip in anti-rust oil and then coat it on the end cut of the outer water cut skeleton;

[0095] Step S903: Coating a rubber part on the outer water cut skeleton.

[0096] First, the outer water cut core material in the foregoing embodiment is precision cut into core material segments of a set length, and then rolled into an outer water cut skeleton. The outer water cut skeleton is grabbed by the oil coating mechanism, and the oil coating mechanism is controlled to dip in anti-rust oil and then coat the anti-rust oil on the end cut of the outer water cut skeleton, and then the subsequent steps of coating a rubber part on the outer water cut skeleton are performed.

[0097] As Figure 10 shown, the oil coating mechanism includes a mechanical gripper 101, an oil coating manipulator 102, and an oil box 103. The mechanical gripper 101 is used to grab the outer water cut skeleton 1104 and transport it to a specified position. Then, the oil coating manipulator 102 moves into the oil box 103 to dip in anti-rust oil and then moves to the end position of the outer water cut skeleton, and controls the oil coating manipulator 102 to move along a set trajectory to coat the end cut of the outer water cut skeleton 104.

[0098] Among them, a liquid level sensor is provided in the oil box 103. When the liquid level sensor detects that the oil liquid level is lower than the preset oil liquid threshold, an oil liquid replenishment signal is sent to avoid missing coating caused by the oil liquid running out and affecting the overall quality of the outer water cut.

[0099] After the fine blanking and roll pressing of the outer water cut skeleton in the embodiment of the present application and before covering with a rubber part, applying an anti-rust oil to the end cut can ensure that the end cut is completely covered by the anti-rust oil to ensure its anti-rust effect.

[0100] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0101] The above are only the principles and preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, the embodiments obtained by appropriately combining the technical solutions separately disclosed in different embodiments are also included in the technical scope of the present invention. Based on the principle of the present application, several other variations can also be made, which should also be regarded as the protection scope of the present application.

Claims

1. An outer water cut core material, characterized in that, It includes a cosmetic section and a covering section connected by laser welding. The cosmetic section is made of a first steel strip, and the covering section is made of a second steel strip; One end of the cosmetic section connected to the covering section is provided with a rounded corner, and a straight transition section is provided at the end of the rounded corner. The covering section is connected to the straight transition section; The length of the straight transition section is greater than or equal to the allowable tolerance length, and the allowable tolerance length is equal to the sum of half of the width of the heat affected zone of the weld, the roll forming tolerance, the steel strip width tolerance, and the welding tolerance; A cut is provided on a local area of the outer water deflector core material on the side where the rounded corner is connected to the straight transition section; If twice the allowable tolerance length is greater than or equal to the maximum remaining length from the rounded corner to the cut, the length of the straight transition section is the sum of the allowable tolerance length and the maximum remaining length; If twice the allowable tolerance length is less than or equal to the minimum remaining length from the rounded corner to the cut, the length of the straight transition section is the allowable tolerance length.

2. The outer water cut core material according to claim 1, characterized in that, The width of the heat affected zone of the weld is 1.2 mm, the roll forming tolerance is 0.2 mm, the steel strip width tolerance is 0.1 mm, and the welding tolerance is 0.1 mm.

3. A bright exterior water cut-off, characterized in that, It includes an outer water deflector skeleton and a rubber part wrapped outside the outer water deflector skeleton for forming a lip. The outer water deflector skeleton is made of the outer water deflector core material as described in any one of claims 1-2, and the outer surface of the cosmetic section is exposed in the rubber part.

4. The bright outer water cut according to claim 3, characterized in that, The end cut of the outer water deflector skeleton is coated with rust preventive oil.

5. A method for manufacturing the outer water cut core material according to any one of claims 1-2, characterized in that, It includes Controlling the first steel strip and the second steel strip to be fed side by side at the same speed synchronously; Controlling the clamping mechanism to press the first steel strip and the second steel strip tightly from both sides and above; Controlling the welding mechanism to perform butt welding on the connection of the first steel strip and the second steel strip, and at the same time controlling the air blowing mechanism to blow high-pressure air on the welding part; Controlling the winding mechanism to wind up the welded outer water deflector core material.

6. The manufacturing method of the outer water cut core material according to claim 5, characterized in that, Before the first steel strip is fed, it further includes Controlling the film tearing mechanism to tear off the self-adhesive protective film on the first steel strip; Before the control clamping mechanism presses the first steel strip and the second steel strip tightly from both sides and above, it further includes Controlling the film pasting mechanism to paste a welding protective film on the first steel strip, and the width of the welding protective film is less than the width of the self-adhesive protective film.

7. The manufacturing method of the outer water cut core material according to claim 6, characterized in that, The clamping mechanism includes splicing pressing parts arranged on both sides and a surface difference pressing part arranged above. The control clamping mechanism presses the first steel strip and the second steel strip tightly from both sides and above, specifically including Controlling the splicing pressing parts to press from both sides of the first steel strip and the second steel strip; Controlling the surface difference pressing part to press from above the first steel strip and the second steel strip.

8. A manufacturing method of the bright outer water cut as claimed in claim 3 or 4, characterized in that, It at least includes Precision cutting the outer water deflector core material into core material segments of a set length and then roll forming them into an outer water deflector skeleton; Controlling the oil coating mechanism to dip in rust preventive oil and then coat it on the end cut of the outer water deflector skeleton; Wrapping a rubber part on the outer water deflector skeleton.

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