Extrusion vulcanization method and mold for double-material door opening strip with metal insert

Abstract

The invention discloses an extrusion forming method and a die for a double-material door opening strip with a metal insert, which are used for preparing a door opening sealing strip comprising an iron insert and a double-material rubber coating layer, and are characterized in that the door opening sealing strip consists of the metal insert, the rubber coating layer A and the rubber coating layer B; the door opening strip extrusion forming die is composed of a first unit template, a second unit template and a third unit template. The first unit template consists of a rubber inlet A, a rubber inlet B, a first rubber storage chamber and a metal insert guide pipe; the second unit template consists of a first coating die hole, a B rubber inlet, a second rubber storage chamber and a die core; and the third unit template consists of a second coating die hole and a knurling device. The extrusion vulcanization method comprises the following steps that a metal insert enters a first coating die hole of the second unit template through a metal insert guide pipe; softened rubber A firstly enters the first rubber storage chamber through the rubber A inlet, then flows into the first coating die hole and coats the surface of the metal insert, and forming is completed in the die hole; softened rubber B firstly enters the second rubber storage chamber through the rubber B inlet and then enters the second coating die hole, and the softened rubber B and the first-time coating workpiece are fused together after being formed; the coated and vulcanized workpiece enters a third unit template, and the knurling device rolls specific patterns on the surface of the rubber; and finally, performing high-temperature vulcanization, cooling and drying to finish the production. The double-material door opening strip with the metal insert can be extruded, formed and manufactured, and the production efficiency and the product quality are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rubber extrusion vulcanization, and more particularly to a method and apparatus for preparing dual-material rubber products with metal inserts. Background Technology

[0002] This invention relates to the field of rubber extrusion vulcanization, specifically to a dual-material door opening strip with a metal insert and its preparation method. Rubber sealing strips are widely used in automobiles, machinery, doors and windows, etc., serving functions such as dustproofing, insect prevention, waterproofing, fixing, sound insulation, shock absorption, and sealing.

[0003] In the production process of rubber sealing strips, extrusion vulcanization is a crucial step. Traditional rubber sealing strip extrusion dies are mostly single-material sealing strip forming channels. If dual-material sealing strips are to be produced, additional equipment is required, leading to a significant increase in costs.

[0004] Door opening strips are often injection molded from multiple rubber materials to enhance their stability and sealing performance. Ensuring a tight bond between these various rubber materials during the extrusion vulcanization process, and preventing defects such as bubbles and cracks, is a pressing issue that needs to be addressed.

[0005] An existing injection mold for the end of a door opening sealing strip (CN 220348914 U) discloses an injection mold for the end of a door opening sealing strip, including an injection production structure and a mating mold structure. The injection production structure and the mating mold structure are relatively limited. The injection production structure can be extended and adjusted to facilitate docking and injection with the mating mold structure. The mating mold structure can be internally extended and adjusted, and cooperates with the injection production structure to perform injection molding of the end of the door opening sealing strip. The injection production structure includes an injection pipe, a hydraulic seat, a hydraulic rod, a conical guide seat, a connecting pipe, a connecting tube, and a heater. The side end of the injection pipe is connected to the heater, the heater is connected to the conical guide seat through the connecting pipe, and the side end of the conical guide seat is connected to the connecting pipe. The conical guide seat is extended and retracted with the hydraulic seat through the hydraulic rod. However, this mold can only produce door opening sealing strips of a single material.

[0006] A current method for co-extruding lightweight automotive door opening sealing strip material (CN 106671759A) discloses a method for co-extruding lightweight automotive door opening sealing strip material, including a steel strip, micro-foaming, and interior trim material. The sponge tube is connected to one side of the micro-foaming, the steel strip is embedded in the inner cavity of the micro-foaming, and the interior trim material is disposed on the outer wall of the micro-foaming. A method for co-extruding surface-coated interior trim material includes the following steps: 1) processing the steel strip into a predetermined shape; 2) adding rubber according to the formula and extruded the product according to the product requirements; 3) vulcanizing the product and micro-foaming during the vulcanization process; 4) surface coating after vulcanization; 5) cooling and molding; 6) cutting to a fixed length. However, this method can only produce door opening sealing strips with single-hole sponge tubes, and the surface pattern is achieved through coating, which is inefficient and prone to peeling. Summary of the Invention

[0007] To address the aforementioned technical problems, the purpose of this invention is to provide a dual-material door opening strip with metal inserts and its preparation method. This invention develops a production mold and process for dual-material door opening strips, using a single mold to achieve multi-material rubber extrusion vulcanization, solving the problems of multiple processes and equipment, thereby improving product quality.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A mold for manufacturing door opening sealing strips is disclosed, used to prepare door opening sealing strips comprising an iron insert and a dual-material rubber coating layer. The door opening sealing strip comprises an iron insert and a dual-material rubber coating layer; the door opening strip extrusion molding mold consists of a first unit template, a second unit template, and a third unit template. The first unit template consists of an A rubber inlet, a B rubber inlet, a first rubber storage chamber, a metal insert conduit, and a flange; the second unit template consists of a first coating die hole, a B rubber inlet, a second rubber storage chamber, a first die core, a second die core, a first mold slot, and a second mold slot; the third unit template consists of a second coating die hole and a knurling device. The first unit template, the second unit template, and the third unit template are connected and fixed by pins and screws.

[0010] Preferably, the first unit template is a rectangular plate with a certain thickness. One side of the plate has a first guide post hole, a second guide post hole, an A rubber inlet, a B rubber inlet, an iron insert inlet, a machine mounting hole, and a flange mounting hole. The other side of the first unit template has a circular cavity that can accommodate a metal insert conduit. The A rubber inlet has two openings, one above the other, leading to the first storage chamber from the top and bottom respectively. The B rubber inlet passes through the first unit template from the right side and extends to the second storage chamber. The metal insert conduit is tapered, smaller at the front and larger at the back. The larger end connects to the first unit template, and the front end is only a guide sleeve that is one size larger than the iron insert and extends to the second unit template. The upper and lower sides have through holes for fixing to the flange, which are the first fixing hole and the second fixing hole, respectively. The middle of the metal insert conduit has a conveying hole for the iron insert to pass through, and the conveying hole has a certain taper.

[0011] Preferably, the flange is embedded in the internal cavity of the first unit template, and the metal insert conduit is connected to the first unit template through the flange; the metal insert conduit is smaller at the front and larger at the back, passing through the first unit template and the second unit template; the second unit template and the cavity of the first unit template cooperate to form the first glue storage chamber, and the second unit template and the cavity of the third unit template cooperate to form the second glue storage chamber; the roller is secured to the upper left side of the upper mold by the first roller fixing strip and the second roller fixing strip.

[0012] Preferably, the second unit template is a rectangular plate with a certain thickness, and is equipped with guide post holes at the corresponding positions of the first unit template. One side of the second unit template has a conical cavity larger than the metal insert guide tube and a B rubber inlet corresponding to the first unit template. The other side of the second unit template has a first covering mold hole with the same cross-sectional shape as the door opening strip but slightly larger in size, a pin hole for fixing to the third unit template, and a second glue storage chamber, which only covers the left side of the door opening strip. A first mold core cavity and a second mold core cavity are left on the left side of the second unit template for nesting the first mold core and the second mold core. A first through hole and a second through hole are left on the top of the second unit template to connect with the first mold core and the second mold core.

[0013] The third unit template is a rectangular plate with a certain thickness, which fits perfectly with the second unit template. The two are connected by a metal insert guide tube, a first mold core and a second mold core, and are equipped with the same guide post holes at corresponding positions. One end of the third unit template has a mold cavity with the same cross-sectional shape as the door opening strip, and the outline edge has a certain cone angle. The other end of the third unit template has a recessed rectangular first cavity, and the bottom of the first cavity has a second cavity for placing the knurling device.

[0014] Preferably, the first mold core and the second mold core are arranged side by side, passing through the second unit template, the second glue storage chamber, and the second unit template; the cross-sectional area of ​​the first mold core is larger than that of the second mold core, and the length of the second mold core is longer than that of the first mold core; the tails of both are connected to the first glue storage chamber of the second unit template, and the heads extend to the bottom of the rectangular cavity of the second unit template; each of the first mold core and the second mold core has a vent hole in the middle, which is perpendicularly connected to two through holes of the second unit template; the first mold core is fitted with the metal insert guide tube, and the second mold core is away from the metal insert guide tube.

[0015] Preferably, the first rubber storage chamber is composed of an irregularly shaped cavity of the first unit template and a conical cavity of the second unit template. A metal insert conduit is located in the center of each cavity, and the surfaces of all cavities are electroplated. The right rear side is connected to the upper and lower feed ports of rubber A, and the front part is connected to the second unit template. The second rubber storage chamber is composed of a concave cavity of the second unit template, and the surfaces of all cavities are electroplated. The rear side is connected to the rubber inlet of rubber B, and the cavity only covers the left side of the doorway strip structure.

[0016] The flange is a concentric circular thin sheet, which is embedded in the circular cavity of the first unit template. It has through holes on its upper and lower sides for fixed connection with the guide sleeve and the first unit template, namely the first flange fixing hole and the second flange fixing hole. The upper parts of the first and second roller fixing strips respectively have a first circular hole and a second circular hole for connection with the second unit template; the first roller fixing strip and the second roller arched liner are respectively connected to the first and second convex rings of the roller shaft.

[0017] A method for preparing a door opening sealing strip, characterized by comprising the following steps:

[0018] S1: The entire molding die set, including the first unit mold 1, the second unit mold 4, and the third unit mold 7, is preheated to a specific temperature and pressure range (65℃, 40MPa) to ensure that the rubber is heated rapidly and uniformly after being injected into the die. The metal insert enters the die from the metal insert conduit at a speed of 2mm / s. The softened A rubber first enters the first rubber storage chamber 103 through the A rubber inlet 106, then flows into the first covering die hole 406 and covers the surface of the metal insert, completing the forming within the die hole to form the left main body of the door opening sealing strip.

[0019] S2: The softened B rubber first enters the second rubber storage chamber 401 through the B rubber inlet 105, and then enters the second coating mold hole 701. After forming, it is integrated with the first coated workpiece to form a double hollow tube structure.

[0020] S3: While the left side of the door opening sealing strip is initially formed but not yet fully hardened, a patterned roller 10 embedded in the third unit template 7 is used for printing. The roller 10 rolls under appropriate pressure to imprint the predetermined pattern onto the upper surface of the door opening strip.

[0021] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0022] This method developed a mold and process for producing dual-material door opening strips, enabling adjustable glue output and solving the problem of poor bonding between metal inserts and rubber materials, thereby improving product quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall assembly of the vulcanization extrusion die for the door opening strip;

[0024] Figure 2 This is an exploded view of the vulcanization extrusion die for the door opening strip;

[0025] Figure 3 This is a schematic diagram of the first unit template structure of the vulcanization extrusion die for the door opening strip;

[0026] Figure 4 This is a schematic diagram of the second unit template structure of the vulcanization extrusion die for the door opening strip;

[0027] Figure 5 This is a schematic diagram of the third unit template structure of the vulcanization extrusion die for the door opening strip;

[0028] Figure 6 This is a schematic diagram of the bottom die structure of a vulcanization extrusion die for a door opening strip;

[0029] Figure 7 This is a schematic diagram of the upper plate structure of the vulcanization extrusion die for the door opening strip;

[0030] Figure 8 This is a schematic diagram of the lower plate structure of the vulcanization extrusion die for the door opening strip;

[0031] Figure 9 This is a schematic diagram of the core structure of a vulcanization extrusion die for a door opening strip;

[0032] Figure 10 This is a schematic diagram of the metal insert conduit structure of the vulcanization extrusion die for the door opening strip;

[0033] Figure 11 This is a schematic diagram of the roller structure of a vulcanization extrusion die for a door opening strip;

[0034] Figure 12 This is a schematic diagram of the roller fixing strip structure of the vulcanization extrusion die for the door opening strip;

[0035] Figure 13This is a schematic diagram of the flange structure of the vulcanization extrusion die for the door opening strip;

[0036] Figure 14 This is a cross-sectional view of the door opening strip product; Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the embodiments and accompanying drawings.

[0038] like Figure 2 As shown, a mold for preparing door opening sealing strips is used to prepare door opening sealing strips. The door opening sealing strip includes an iron insert and a dual-material rubber coating layer. The door opening strip extrusion molding mold consists of a first unit template 1, a second unit template 4, and a third unit template 7. The first unit template consists of an A rubber inlet 105, a B rubber inlet 106, a first rubber storage chamber 103, a metal insert conduit 2, and a flange 3. The second unit template 4 consists of a first coating die hole 406, a B rubber inlet 106, a second rubber storage chamber 401, a first die core 6, a second die core 5, a first mold slot 407, and a second mold slot 408. The third unit template 7 consists of a second coating die hole 701 and a knurling device 10. The first unit template 1, the second unit template 4, and the third unit template 7 are connected and fixed by pins and screws.

[0039] Preferably, the first unit template 1 is a rectangular plate with a certain thickness. One side of the plate has a first guide post hole 101, a second guide post hole 102, an A rubber inlet 105, a B rubber inlet 106, an iron insert inlet 104, a machine base fixing hole 108, and a flange fixing hole 201. The other side of the first unit template 1 has a circular cavity that can accommodate the metal insert conduit 2. The A rubber inlet 105 is divided into upper and lower openings, which lead to the first rubber storage chamber 103 from the upper and lower directions respectively. The B rubber inlet 106 passes through the first unit template 1 from the right side and extends to the second rubber storage chamber 401. The metal insert conduit 2 is tapered, smaller at the front and larger at the back. The larger end is connected to the first unit template 1, and the front end is only a guide sleeve that is one size larger than the iron insert and extends to the second unit template 4. There are through holes on the upper and lower sides for fixing to the flange 3, namely the first fixing hole 202 and the second fixing hole 203, respectively. There is a conveying hole 201 in the middle of the metal insert conduit 2 for the iron insert 13 to pass through. The conveying hole 201 has a certain taper.

[0040] Preferably, the second unit template 4 is a rectangular plate with a certain thickness, and is equipped with guide post holes 410 at the corresponding positions of the first unit template 1. One side of the second unit template 4 has a conical cavity larger than the metal insert guide tube 2 and a B rubber inlet 402 corresponding to the first unit template 1. The other side of the second unit template 4 has a first covering mold hole 406 with the same cross-sectional shape as the door opening strip but slightly larger in size, a pin hole 409 for fixing to the third unit template, and a second glue storage chamber 401, which only covers the left side of the door opening strip. A first mold core cavity 407 and a second mold core cavity 406 are left on the left side of the second unit template for nesting the first mold core 6 and the second mold core 5. A first through hole 405 and a second through hole 404 are left on the top of the second unit template to connect with the first mold core vent hole 601 and the second mold core vent hole 501.

[0041] Preferably, the third unit template 7 is a rectangular plate with a certain thickness, which is completely fitted with the second unit template 4. The two are connected by a metal insert guide tube, a first mold core 6 and a second mold core 5, and are equipped with the same guide post holes at corresponding positions. One end of the third unit template 7 has a second covering mold hole 701 with the same cross-sectional shape as the door opening strip, and the outline edge has a certain cone angle. The other end of the third unit template 7 has a rectangular first cavity 702 recessed, and the bottom of the first cavity has a second cavity 703 for placing the knurling device.

[0042] Preferably, the knurling device consists of a roller 10, a roller shaft 9, a first roller fixing strip 11, and a second roller fixing strip 8. The roller 10 is fixed in the rectangular cavity of the second unit template through the first roller fixing strip 11 and the second roller fixing strip 8. The roller 10 is arranged at an overall angle, and the outer contour shape of the roller 10 is the same as the shape of the upper surface of the right side structure of the door opening strip, and the surface has a certain shape of raised patterns. The roller shaft 9 has two convex rings, namely the first convex ring 902 and the second convex ring 901, for limiting the movement of the roller 10 by locking the first convex ring 901 and the second convex ring 902 of the roller shaft. The upper part of the first roller fixing strip 11 and the second roller fixing strip 8 are respectively provided with through holes 111 and 801 to connect with the second unit template 7.

[0043] Preferably, the first mold core 6 and the second mold core 5 are arranged side by side, passing through the second unit template 4, the second glue storage chamber 401, and the third unit template 7; the cross-sectional area of ​​the first mold core 6 is larger than that of the second mold core 5, and the length of the second mold core 5 is longer than that of the first mold core 6; their tails are connected to the first glue storage chamber 103 of the second unit template 4, and their heads extend to the bottom of the rectangular cavity of the second unit template 7; the first mold core 6 and the second mold core 5 each have a through hole (601 and 501) in the middle, which are perpendicularly connected to the two vent holes 405 and 404 of the second unit template 4; the first mold core 6 is fitted with the metal insert conduit 2, and the second mold core 5 is away from the metal insert conduit.

[0044] Preferably, the first rubber storage chamber 103 is composed of an irregularly shaped cavity of the first unit template 1 and a conical cavity of the second unit template 4. A metal insert conduit 2 is located in the center of the cavity, and the surfaces of the cavities are electroplated. The right rear side is connected to the upper and lower feed ports 105 of rubber A, and the front part is connected to the second unit template 4. The second rubber storage chamber 401 is composed of a concave cavity of the second unit template 4, and the surfaces of the cavities are electroplated. The rear side is connected to the rubber inlet 402 of rubber B, and the cavity only covers the left side of the doorway strip structure.

[0045] Preferably, the flange 3 is a concentric circular thin sheet, which is embedded in the circular cavity of the first unit template 1. Through holes are provided on the upper and lower sides for fixed connection with the guide sleeve head 2 and the first unit template 1, namely the first flange fixing hole 301 and the second flange fixing hole 302, respectively. The upper parts of the first roller fixing strip 11 and the second roller fixing strip 8 are respectively provided with a first circular hole 111 and a second circular hole 801 for connection with the third unit template; the arched bushings 112 and 802 of the first roller fixing strip 11 and the second roller 8 are respectively connected to the first convex ring 902 and the second convex ring 901 of the roller shaft.

[0046] A method for preparing a door opening sealing strip, characterized by comprising the following steps:

[0047] S1: The entire molding die set, including the first unit mold 1, the second unit mold 4, and the third unit mold 7, is preheated to a specific temperature and pressure range (65℃, 40MPa) to ensure that the rubber is heated quickly and evenly after being injected into the die. The metal insert 13 enters the die from the metal insert conduit 2 at a speed of 2mm / s. The softened A rubber first enters the first rubber storage chamber 103 through the A rubber inlet 106, then flows into the first covering die hole 406 and covers the surface of the metal insert, completing the forming within the die hole to form the left main body of the door opening sealing strip.

[0048] S2: The softened B rubber first enters the second rubber storage chamber 401 through the B rubber inlet 105, and then enters the second coating mold hole 701. After forming, it is integrated with the first coated workpiece to form a double hollow tube structure.

[0049] S3: While the left side of the door opening sealing strip is initially formed but not yet fully hardened, a patterned roller 10 embedded in the third unit template 7 is used for printing. The roller 10 rolls under appropriate pressure to imprint the predetermined pattern onto the upper surface of the door opening strip.

[0050] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A die for extruding a door opening strip with a metal insert and two materials, used to prepare a door opening sealing strip comprising an iron insert and a dual-material rubber coating layer, characterized in that, The door opening sealing strip includes an iron insert and a dual-material rubber coating layer; the door opening strip extrusion molding die consists of a first unit template, a second unit template, and a third unit template. The first unit template consists of an A rubber inlet, a B rubber inlet, a first rubber storage chamber, a metal insert guide tube, and a flange; the second unit template consists of a first coating die hole, a B rubber inlet, a second rubber storage chamber, a first die core, a second die core, a first pry die groove, and a second pry die groove; the third unit template consists of a second coating die hole and a knurling device. The first unit template, the second unit template, and the third unit template are connected and fixed by pins and screws.

2. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 1, characterized in that, The first unit template is a rectangular plate of a certain thickness. One side of the plate has a first guide post hole, a second guide post hole, an A rubber inlet, a B rubber inlet, a metal insert inlet, a machine mounting hole, and a flange mounting hole. The other side of the first unit template has a circular cavity that can accommodate a metal insert conduit. The A rubber inlet has two openings, one above the other, leading to the first storage chamber from the top and bottom respectively. The B rubber inlet passes through the first unit template from the right side and extends to the second storage chamber. The metal insert conduit is tapered, smaller at the front and larger at the back. The larger end connects to the first unit template, and the front end is only a guide sleeve that is larger than the metal insert and extends to the second unit template. The upper and lower sides have through holes for fixing to the flange, which are the first and second fixing holes respectively. The middle of the metal insert conduit has a conveying hole for the metal insert to pass through, and the conveying hole has a certain taper.

3. The extrusion molding die for a dual-material door opening strip with a metal insert as described in claim 3, wherein the flange is embedded in the internal cavity of the first unit template, and the metal insert conduit is connected to the first unit template through the flange; the metal insert conduit is smaller at the front and larger at the back, passing through the first unit template and the second unit template; the second unit template and the cavity of the first unit template cooperate to form a first glue storage chamber, and the second unit template and the cavity of the third unit template cooperate to form a second glue storage chamber; the roller is secured to the upper left side of the upper die through the first roller fixing strip and the second roller fixing strip.

4. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 4, characterized in that, The second unit template is a rectangular plate with a certain thickness. It is equipped with guide post holes at the corresponding positions of the first unit template. One side of the second unit template has a conical cavity larger than the metal insert guide tube and a B rubber inlet corresponding to the first unit template. The other side of the second unit template has a first covering mold hole with the same cross-sectional shape as the door opening strip but slightly larger in size, a pin hole for fixing to the third unit template, and a second glue storage chamber, which only covers the left side of the door opening strip. A first mold core cavity and a second mold core cavity are left on the left side of the second unit template for nesting the first mold core and the second mold core. A first through hole and a second through hole are left on the top of the second unit template to connect with the first mold core and the second mold core.

5. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 5, characterized in that, The third unit template is a rectangular plate with a certain thickness, which fits completely with the second unit template. The two are connected by a metal insert guide tube, the first mold core and the second mold core, and the corresponding positions are equipped with the same guide post holes. The third unit template has a second covering mold hole at one end with the same cross-sectional shape as the first mold core and the second mold core, and the outline edge has a certain taper angle; The other end of the third unit template has a recessed rectangular first cavity, and the bottom of the first cavity has a second cavity for placing the knurling device.

6. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 6, characterized in that, The knurling device consists of a roller, a roller shaft, a first roller fixing strip, and a second roller fixing strip. The roller is fixed in the rectangular cavity of the second unit template by the first and second roller fixing strips. The roller is arranged at an angle, and the outer contour of the roller is the same as the shape of the upper surface of the right side of the door opening strip. The surface has a certain shape of raised patterns. The roller shaft has two convex rings, namely the first convex ring and the second convex ring, for limiting. The first and second roller fixing strips restrict the movement of the roller by locking the first and second convex rings of the roller shaft.

7. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 7, characterized in that, The first mold core and the second mold core are arranged side by side, passing through the second unit template, the second glue storage chamber, and the third unit template; the cross-sectional area of ​​the first mold core is larger than that of the second mold core, and the length of the second mold core is longer than that of the first mold core; the tails of both are connected to the first glue storage chamber of the second unit template, and the heads extend to the bottom of the rectangular cavity of the second unit template; each of the first mold core and the second mold core has a vent hole in the middle, which is perpendicularly connected to two through holes of the second unit template; the first mold core is fitted with the metal insert guide tube, and the second mold core is away from the metal insert guide tube.

8. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 8, characterized in that, The first rubber storage chamber consists of an irregularly shaped cavity in the first unit template and a conical cavity in the second unit template. A metal insert conduit is located in the center of each cavity, and all cavity surfaces are electroplated. The right rear side connects to the upper and lower feed ports of rubber A, and the front side connects to the second unit template. The second rubber storage chamber consists of a concave cavity in the second unit template, and all cavity surfaces are electroplated. The rear side connects to the rubber inlet of rubber B, and the cavity only covers the left side of the doorway strip structure.

9. The extrusion die for a dual-material door opening strip with a metal insert as described in claim 10, characterized in that, The flange is a concentric circular thin sheet, which is embedded in the circular cavity of the first unit template. It has through holes on its upper and lower sides for fixed connection with the guide sleeve and the first unit template, namely the first flange fixing hole and the second flange fixing hole. The upper parts of the first and second roller fixing strips respectively have a first circular hole and a second circular hole for connection with the third unit template; the first roller fixing strip and the second roller arched liner are respectively connected to the first and second convex rings of the roller shaft.

10. The method for preparing a dual-material door opening strip with metal insert as described in claim 12, characterized in that, Includes the following steps: S1: The entire molding die set, including the first unit mold 1, the second unit mold 4, and the third unit mold 7, is preheated to a specific temperature and pressure range (65℃, 40MPa) to ensure that the rubber is heated rapidly and uniformly after being injected into the die. The metal insert enters the die from the metal insert conduit at a speed of 2mm / s. The softened A rubber first enters the first rubber storage chamber 103 through the A rubber inlet 106, then flows into the first covering die hole 406 and covers the surface of the metal insert, completing the forming within the die hole to form the left main body of the door opening sealing strip. S2: The softened B rubber first enters the second rubber storage chamber 401 through the B rubber inlet 105, and then enters the second coating mold hole 701. After forming, it is integrated with the first coated workpiece to form a double hollow tube structure. S3: While the left side of the door opening sealing strip is initially formed but not yet fully hardened, a patterned roller 10 embedded in the third unit template 7 is used for printing. The roller 10 rolls under appropriate pressure to imprint the predetermined pattern onto the upper surface of the door opening strip.

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