Flat wire coating die

Abstract

The invention discloses a flat wire coating die, which comprises an inner die and an outer die, wherein the inner die is formed with an inner die opening, and the contour of the inner die opening is set in a dumbbell shape; the outer die is set on the outer side of the inner die, and the outer die opening is provided at a position of the outer die corresponding to the inner die opening, and the contour of the outer die opening is set in a rectangular shape. The invention improves the structure of the flat wire coating die, improves the uniformity of the thickness of the coating layer of the flat wire, achieves a better coating effect, and improves the qualified rate of the finished product.

Description

Technical Field

[0001] The invention relates to the technical field of rubber coating moulds, and in particular to a flat wire coating mould. Background Art

[0002] At present, in some application scenarios, due to the mechanical, structural and functional requirements of the product, the shape of the core material will use a flat structure. For example, the core component of the wiping function of the boneless wiper system used in passenger cars or commercial vehicles - the plastic-coated reed, the outer layer of which is coated with PET, and the thickness of the coating layer is 0.05-0.1mm. The core material is a flat steel strip with a thickness of 0.5-1.2mm and a width of 5-15mm based on the functional requirements of strength, rigidity and supporting rubber parts; in addition, the hairpin insulated electromagnetic wire used in new energy drive motors has an increased energy density per unit volume (higher slot fill rate), electronic skin effect and surface heat dissipation requirements. The optimal choice for the copper conductor used for carrying current is a flat shape, and then the surface is painted with insulating material and high-performance insulating plastic material is extruded and coated to enhance insulation or directly extruded and coated.

[0003] The existing flat wire coating mold includes an inner mold and an outer mold, etc. The coating layer has defects such as uneven thickness in the angle area, the coating effect is general, and the product qualification rate is low. Summary of the invention

[0004] The main purpose of the present invention is to provide a flat wire coating die, aiming to improve the uniformity of the coating thickness of the flat wire, achieve a better coating effect, and improve the qualified rate of the finished product.

[0005] To achieve the above object, the present invention provides a flat wire coating die, the flat wire coating die comprising:

[0006] An inner mold is formed with an inner mold opening, wherein the contour of the inner mold opening is arranged in a dumbbell shape; and

[0007] The outer mold is arranged on the outer side of the inner mold. The outer mold is provided with an outer mold opening at a position corresponding to the inner mold opening. The outline of the outer mold opening is arranged in a rectangular shape.

[0008] Optionally, the contour of the inner die opening includes a first contour segment and a second contour segment which are symmetrically arranged, and the first contour segment and the second contour segment each include a parallel segment located in the middle thereof, two avoidance segments respectively connected to both ends of the parallel segment, and two transition segments respectively connected to the two avoidance segments;

[0009] Wherein, the avoidance section is extended along a direction away from a symmetry line of the first contour section and the second contour section to form the dumbbell-shaped inner die opening.

[0010] Optionally, the length of the parallel section is adapted to be greater than one third of the width of the flat wire and less than two thirds of the width of the flat wire.

[0011] Optionally, the maximum distance between the avoidance section of the first contour segment and the corresponding avoidance section on the second contour segment is 0.1 to 0.3 mm greater than the distance between the parallel section of the first contour segment and the parallel section of the second contour segment.

[0012] Optionally, the transition section is in an arc shape, and the radius of the fillet is 0.3-0.5 mm.

[0013] Optionally, the four corners of the outer die opening are arc-shaped, and the radius of the fillet is 0.3 to 0.5 mm.

[0014] Optionally, the outer peripheral wall of the inner mold forms a first rotation surface, and the first rotation surface is conical.

[0015] Optionally, the outer peripheral wall of the outer mold forms a second rotation surface, and the second rotation surface is cylindrical.

[0016] Optionally, the flat wire coating mold further comprises two body fixing blocks, which are arranged on both sides of the inner mold and the outer mold for fixing on the extruder head of the extrusion molding machine.

[0017] Optionally, the flat wire coating mold further includes a diverter, which is disposed between the two fuselage fixing blocks and is disposed around one end of the inner mold, and the diverter is connected to the inner mold.

[0018] In the technical solution of the present invention, the flat wire coating die includes an inner die and an outer die, the inner die is formed with an inner die opening, and the contour of the inner die opening is set in a dumbbell shape; the outer die is arranged on the outside of the inner die, and the outer die opening is provided at the position of the outer die corresponding to the inner die opening, and the contour of the outer die opening is set in a rectangular shape. Among them, the contour of the inner die opening is set in a dumbbell shape, which is conducive to improving the accuracy of the wire coating thickness and reducing the processing difficulty, and is conducive to avoiding the shape error or processing peaks or burrs at the corners when the core material passes through, especially for the core material that has a primary coating or plating, the corners are very likely to have coating or plating accumulation; moreover, the avoidance area at both ends and the space formed between the core material can realize the pressure in the opposite direction of the core material in the extrusion cavity, which is more conducive to the movement of the core material to bring out the extruded molten coating material to form a coating layer. Therefore, the flat wire coating die improves the uniformity of the coating thickness of the flat wire, achieves a better coating effect, and thus improves the qualified rate of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a flat wire coating die of the present invention;

[0021] Figure 2 for Figure 1 Side view of

[0022] Figure 3 It is a cross-sectional view of some parts of an embodiment of a flat wire coating die of the present invention;

[0023] Figure 4 It is a profile diagram of the inner die opening of the inner die in one embodiment of the flat wire coating die of the present invention;

[0024] Figure 5 FIG. 1 is a profile diagram of the outer die opening of the outer die in one embodiment of the flat wire coating die of the present invention.

[0025] Description of Figure Numbers:

[0026] 10. Inner mold; 20. Outer mold; 10a. Inner mold opening; 10b. Positioning notch; 20a. Outer mold opening; 21. Outer mold sleeve; 22. Axial pressure block; 101. Parallel section; 102. Avoidance section; 103. Transition section; 111. First rotating surface; 211. Second rotating surface; 201. Positioning pin; 30. Diverter.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides a flat wire coating die, which is suitable for coating flat metal wires, especially flat steel strips or flat copper strips, etc., which are not specifically limited here.

[0032] Reference Figures 1 to 5 In one embodiment of the present invention, the flat wire coating mold includes an inner mold 10 and an outer mold 20, and the inner mold 10 is formed with an inner mold opening 10a. Figure 4 As shown, the contour of the inner die opening 10a is set in a dumbbell shape; the outer die 20 is set on the outer side of the inner die 10, and the outer die opening 20a is set at the position of the outer die 20 corresponding to the inner die opening 10a, as shown in FIG. Figure 5 As shown, the outer die opening 20a has a rectangular outline.

[0033] In this embodiment, the inner mold 10 can be at least partially inserted into the outer mold 20, and the inner mold opening 10a and the outer mold opening 20a are connected by a fluid flow channel. The inner mold opening 10a and the outer mold opening 20a can be coaxially arranged, that is, the two can be arranged opposite to each other to facilitate the flow of glue and ensure that the product processing size meets the standard.

[0034] Main references Figure 1 and Figure 3 In this embodiment, in order to facilitate positioning so that the inner die opening 10a is aligned with the outer die opening 20a, a positioning notch 10b connected to other parts of the mold can be provided at the end of the inner mold 10 facing away from the outer mold 20, and a positioning pin 201 connected to the outer mold sleeve 21 or other parts of the mold can be provided on the outer mold 20. An axial pressure block 22 can be inserted between the outer end circumferential wall of the outer mold 20 and the outer mold sleeve 21 to fix the axial direction of the outer mold 20.

[0035] In the technical solution of the present invention, the flat wire coating die includes an inner die 10 and an outer die 20. The inner die 10 is formed with an inner die opening 10a, and the outline of the inner die opening 10a is set in a dumbbell shape; the outer die 20 is arranged on the outer side of the inner die 10, and the outer die opening 20a is arranged at the position corresponding to the inner die opening 10a of the outer die 20, and the outline of the outer die opening 20a is set in a rectangular shape. Among them, the outline of the inner die opening 10a is set in a dumbbell shape, which is conducive to improving the accuracy of the wire coating thickness and reducing the processing difficulty, and is conducive to avoiding the shape error or processing peaks or burrs of the corners when the core material passes through, especially the core material that has a primary coating or plating, and the corners are very likely to have coating or plating accumulation; moreover, the avoidance area at both ends and the space formed by the core material can realize the pressure in the opposite direction of the core material in the extrusion cavity, which is more conducive to the movement of the core material to bring out the extruded molten coating material to form a coating layer. Therefore, the flat wire coating die improves the uniformity of the coating thickness of the flat wire, achieves a better coating effect, and thus improves the qualified rate of the finished product.

[0036] Please refer to Figure 4 In order to improve the processing accuracy of the flat wire coating die and further improve the coating effect of the wire, in one embodiment, the contour of the inner die opening 10a includes a first contour segment and a second contour segment that are symmetrically arranged, and the first contour segment and the second contour segment both include a parallel segment 101 located in the middle, two avoidance segments 102 respectively connected to the two ends of the parallel segment 101, and two transition segments 103 respectively connected to the two avoidance segments 102; wherein the avoidance segment 102 is extended along the direction away from the symmetry line of the first contour segment and the second contour segment to form a dumbbell-shaped inner die opening 10a.

[0037] In this embodiment, the inner die opening 10a is provided with upper and lower positioning parallel sections 101 with shortened middle parts, which is conducive to improving the thickness accuracy of the wire passing through and reducing the processing difficulty. In addition, the avoidance sections 102 with outward eight-shaped corners at both ends of the inner die opening 10a are conducive to avoiding the shape errors or processing peaks or burrs at the corners when the core material passes through, especially for the core material that has already had a primary coating or plating, and there is a high possibility of coating or plating accumulation at the corners. At the same time, the avoidance areas at both ends and the space formed between the core material passing through can realize the pressure in the opposite direction of the core material in the extrusion cavity, which is more conducive to the movement of the core material to bring out the extruded molten coating material to form a coating layer.

[0038] In order to further improve the processing accuracy, in one embodiment, reference Figure 4 The length of the parallel section 101 is suitable to be greater than one third of the width of the flat wire and less than two thirds of the width of the flat wire.

[0039] Based on the above embodiment, the maximum distance between the avoidance section 102 of the first contour section and the avoidance section 102 on the second contour section is 0.1 to 0.3 mm greater than the distance between the parallel section 101 of the first contour section and the parallel section 101 of the second contour section. In this way, the dimensional accuracy of the rubber coating layer of the flat wire coating mold can be further improved.

[0040] Furthermore, the transition section 103 may be in an arc shape, and the radius of the fillet may be 0.3-0.5 mm.

[0041] In this embodiment, the four corners of the outer die opening 20a may be arc-shaped, and the radius of the fillet may be 0.3-0.5 mm.

[0042] Experimental tests have shown that when the shapes and sizes of the inner die opening 10a and the outer die opening 20a are limited within the above range, the four-corner covering effect of the flat wire can reach a better state, which can greatly improve the product yield.

[0043] Furthermore, in some embodiments, Figure 3 As shown, the outer peripheral wall of the inner mold 10 forms a first revolution surface 111, and the first revolution surface 111 is conical.

[0044] refer to Figure 3 In this embodiment, the outer peripheral wall of the outer mold 20 forms a second rotating surface 211, and the second rotating surface 211 is cylindrical.

[0045] It can be understood that by circular positioning of the rotating surface of the mold outer contour combined with angle adjustment, the two-dimensional positioning accuracy complexity of the thickness and width of the flat wire can be simplified to the one-dimensional accuracy adjustability of the angle, and equipped with suitable guides or positioning gauges, the installation difficulty can be simplified, the accuracy of the installation and positioning of the inner mold 10 and the outer mold 20 can be improved, and the processing accuracy can be improved.

[0046] In order to facilitate the installation of the inner mold 10 and the outer mold 20, in some embodiments, the flat wire coating mold may also include two body fixing blocks (not shown in the figure), which are arranged on both sides of the inner mold 10 and the outer mold 20 for fixing on the extruder head of the extrusion molding machine.

[0047] Furthermore, in order to achieve diversion to improve the efficiency and effect of encapsulation, in one embodiment, the flat wire coating mold also includes a diverter 30, which is arranged between the two fuselage fixing blocks and around one end of the inner mold 10, and the diverter 30 is connected to the inner mold 10.

[0048] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A flat wire coating die, characterized in that: The flat wire coating die comprises: An inner die is formed with an inner die opening, the contour of the inner die opening is set in a dumbbell shape, the contour of the inner die opening includes a first contour segment and a second contour segment that are symmetrically arranged, the first contour segment and the second contour segment each include a parallel segment located in the middle, two avoidance segments respectively connected to both ends of the parallel segment, and two transition segments respectively connected to the two avoidance segments; wherein the avoidance segment is extended in a direction away from a symmetry line of the first contour segment and the second contour segment to form the dumbbell-shaped inner die opening; and The outer mold is arranged on the outer side of the inner mold. The outer mold is provided with an outer mold opening at a position corresponding to the inner mold opening. The outline of the outer mold opening is arranged in a rectangular shape. The inner mold opening and the outer mold opening are arranged coaxially.

2. The flat wire coating die according to claim 1, characterized in that: The length of the parallel section is adapted to be greater than one third of the width of the flat wire and less than two thirds of the width of the flat wire.

3. The flat wire coating die according to claim 2, characterized in that: The maximum distance between the avoidance section of the first contour segment and the corresponding avoidance section on the second contour segment is 0.1 to 0.3 mm greater than the distance between the parallel section of the first contour segment and the parallel section of the second contour segment.

4. The flat wire coating die according to claim 3, characterized in that: The transition section is in an arc shape, and the radius of the fillet is 0.3-0.5 mm.

5. The flat wire coating die according to claim 1, characterized in that: The four corners of the outer die opening are arc-shaped, and the radius of the fillet is 0.3-0.5 mm.

6. The flat wire coating die according to claim 1, characterized in that: The outer peripheral wall of the inner mold forms a first revolution surface, and the first revolution surface is conical.

7. The flat wire coating die according to claim 6, characterized in that: The outer peripheral wall of the outer mold forms a second rotation surface, and the second rotation surface is cylindrical.

8. The flat wire coating die according to claim 7, characterized in that: The flat wire coating die also includes two fuselage fixing blocks, which are arranged on both sides of the inner die and the outer die to be fixed on the extruder head of the extrusion molding machine.

9. The flat wire coating die according to claim 8, characterized in that: The flat wire coating mold further comprises a flow divider, which is arranged between the two fuselage fixing blocks and surrounds one end of the inner mold, and the flow divider is communicated with the inner mold.

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