Injection mold for automobile door trim strip

Abstract

The utility model relates to an injection mold for an automobile door trim strip. The injection mold comprises an end plate, a bottom plate, a movable mold plate, a fixed mold plate, a mold core and an ejection mechanism, wherein the end plate and the bottom plate are respectively arranged front and back; the movable mold plate and the fixed mold plate are respectively fixed on the rear side of the end plate and the front side of the bottom plate and are matched with each other; a material melting plate is further fixed between the end plate and the movable mold plate, a material melting assembly is further arranged in the material melting plate, and the material melting assembly comprises a frame embedded in the material melting plate, a heat conduction block embedded in the frame and a plurality of material injection units sequentially arranged on the heat conduction block from top to bottom; a plurality of heating pipes which are sequentially arranged from top to bottom are fixed to the outer walls of the front side and the rear side of the heat conduction block. According to the utility model, the flowability of molten materials can be effectively ensured, so that the molten materials can be quickly and fully filled in the whole forming cavity, and the forming qualification rate is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of injection mould of automobile door trim. BACKGROUND

[0002] Door trim is installed in the inside of automobile door to protect the door from scratching and water erosion, improve the visual effect of automobile, and provide certain decoration and aesthetic effect of accessories, door trim is usually made of polyvinyl chloride material, and the production method is injection molding.

[0003] Since the length of door trim is longer, and the width is narrower, a forming cavity that cooperates with the length of door trim must be processed in the injection mold of door trim. However, the existing injection mold mostly lacks heat preservation function. After the molten material flows through the gate and the long and narrow forming cavity, the temperature gradually decreases, and the flowability gradually weakens, which causes the molten material to be unable to quickly and fully reach the end of the long and narrow forming cavity, thereby reducing the forming qualification rate, which needs to be further improved. SUMMARY

[0004] In view of the above status of the prior art, the technical problem to be solved by the utility model is to provide an injection mold for automobile door trim that effectively ensures the flowability of molten material, so that the molten material can quickly and fully fill the entire forming cavity, thereby improving the forming qualification rate.

[0005] The utility model solves the above technical problem by adopting the following technical scheme: an injection mold for automobile door trim, comprising end plates and a bottom plate arranged in front and back respectively, a movable mold plate and a fixed mold plate fixed on the rear side of the end plate and the front side of the bottom plate and cooperating with each other, a mold core embedded in the front side of the fixed mold plate, and an ejection mechanism arranged between the bottom plate and the fixed mold plate, characterized in that:

[0006] A molten material plate is further fixed between the end plate and the movable mold plate, and a molten material assembly is further arranged in the molten material plate. The molten material assembly comprises a frame embedded in the molten material plate, a heat conduction block embedded in the frame, and a plurality of injection units arranged on the heat conduction block in sequence from top to bottom.

[0007] A plurality of first counterbores distributed in sequence from top to bottom are formed on the rear side of the heat conduction block. Correspondingly, a plurality of second counterbores of the same number and distributed in sequence from top to bottom are formed on the front side of the heat conduction block. Each second counterbore is concentrically arranged with a corresponding first counterbore. The number of first counterbores is equal to the number of injection units. Each injection unit is arranged between a corresponding first counterbore and a second counterbore.

[0008] A second counterbore is arranged in the center of the bottom surface of each first counterbore, and a feeding hole is arranged between the right outer wall of the heat-conducting block and the inner wall of each second counterbore, and a through hole is arranged between the center of the bottom surface of each second counterbore and the center of the bottom surface of a corresponding second counterbore;

[0009] The feeding unit comprises a storage cylinder fixed in the movable mold plate, an opening and closing cylinder fixed on the front side of the heat-conducting block and located at the opening of the first counterbore, a telescopic rod movably and sealingly inserted into the through hole, a heating wire wound outside the storage cylinder, and a discharge nozzle sealingly inserted into the opening at the end of the storage cylinder.

[0010] The front end of the storage cylinder is sealingly fixed on the rear side of the heat-conducting block, the opening at the front end of the storage cylinder is in communication with the opening of the second counterbore, the interior of the discharge nozzle is in communication with the interior of the storage cylinder, the telescopic end of the opening and closing cylinder is arranged laterally rearward and concentrically fixed on the front end of the telescopic rod, and the rear end of the telescopic rod passes through the storage cylinder and is sealingly inserted into the opening at the end of the discharge nozzle.

[0011] A plurality of heating pipes are fixed on the front and rear outer walls of the heat-conducting block and arranged sequentially from top to bottom.

[0012] Preferably, a forming concave cavity is arranged on the rear side of the movable mold plate, and a forming convex block is formed on the front side of the mold core and outwardly matched with the forming concave cavity.

[0013] Preferably, a first forming inclined cavity is formed on the left and right inner walls of the forming concave cavity and arranged symmetrically, and a second forming inclined cavity is formed on the left and right side edges of the end of the forming convex block and arranged symmetrically, and the two second forming inclined cavities are matched with the two first forming inclined cavities, respectively.

[0014] Preferably, a plurality of cross-shaped material guiding grooves are arranged on the end outer wall of the forming convex block and distributed sequentially from top to bottom, and a same number of pressure cavities are arranged on the bottom surface of the forming concave cavity and distributed sequentially from top to bottom, the number of the cross-shaped material guiding grooves is equal to the number of the feeding units, and the end opening of the discharge nozzle in each feeding unit is in communication with the interior of a corresponding cross-shaped material guiding groove.

[0015] Preferably, a discharge groove is arranged on the left and right side edges of the opening of each pressure cavity, and the two discharge grooves are matched with the left and right ends of a corresponding cross-shaped material guiding groove, respectively.

[0016] Preferably, a distribution groove is formed outwardly on the left and right side edges of the end opening of each discharge groove, and a plurality of flow-through grooves are arranged between the outer edge of the opening of each distribution groove and the inner edge of a same first forming inclined cavity.

[0017] Preferably, each of the cross-shaped material guiding groove is outwardly formed with a diversion groove at left and right ends, and each of the diversion groove is outwardly formed with a shunt cavity at one end.

[0018] Preferably, the material injection unit further comprises a heat insulation cylinder fixedly sleeved outside the material storage cylinder, and the heating wire is arranged inside the heat insulation cylinder.

[0019] Preferably, the end opening of the material storage cylinder is further sealingly plugged with an air outlet nozzle, the material outlet nozzle is concentrically inserted inside the air outlet nozzle, and the rear end of the telescopic rod is sealingly and penetratingly arranged inside the end opening of the air outlet nozzle.

[0020] Compared with the prior art, the utility model has the advantages that: the utility model can first heat the molten material flowing through the runner by the heat conduction block and the plurality of heating pipes fixed on the heat conduction block to restore the initial temperature, and then secondly heat the molten material about to enter the molding cavity by the plurality of heating wires in the material injection unit, thereby effectively ensuring the fluidity of the molten material, so that the molten material can quickly and fully fill the entire molding cavity, thereby improving the molding qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is the exploded structure diagram of the left front side of the utility model;

[0022] Fig. 2 It is the exploded structure diagram of the right rear side of the utility model;

[0023] Fig. 3 It is the left view cross-sectional structure diagram of the material injection unit of the utility model;

[0024] Fig. 4 It is the right rear side structure diagram of the heat conduction block of the utility model;

[0025] Fig. 5 It is the left front side structure diagram of the heat conduction block of the utility model;

[0026] Fig. 6 It is the local enlarged structure diagram of the utility model at A. DETAILED DESCRIPTION

[0027] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meaning as understood by a person of ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "comprise", "comprising", and similar terms mean that the elements or objects before the word encompass the elements or objects listed after the word, and equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "coupled" and similar terms do not mean only physical or mechanical connections or couplings, but can include electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and when the absolute positions of the described objects change, the relative positions can also change accordingly.

[0028] In order to keep the following description of the embodiments of the present application clear and concise, detailed descriptions of known functions and known components are omitted.

[0029] As shown in Figs. 1-6 An injection mold for an automobile door trim strip, comprising end plates 1 and bottom plates 5 arranged front and back respectively, movable mold plates 3 and fixed mold plates 6 fixed on the rear side of the end plates 1 and the front side of the bottom plates 5 respectively and cooperating with each other, mold cores 4 embedded in the front side of the fixed mold plates 6, and ejection mechanisms 7 arranged between the bottom plates 5 and the fixed mold plates 6;

[0030] The rear side of the movable mold plates 3 is provided with a forming concave cavity 31, and the front side of the mold cores 4 is correspondingly provided with a forming convex block 41 cooperating with the forming concave cavity 31;

[0031] The left and right inner walls of the forming concave cavity 31 are each provided with a first forming inclined cavity 32 arranged symmetrically, and the left and right edges of the end of the forming convex block 41 are each provided with a second forming inclined cavity 42 arranged symmetrically, and the two second forming inclined cavities 42 cooperate with the two first forming inclined cavities 32 respectively;

[0032] The end plates 1 and the movable mold plates 3 are further fixed with a melting plate 2, and the melting plate 2 is further provided with a melting assembly 8, which comprises a frame 81 embedded in the melting plate 2, a heat-conducting block 82 embedded in the frame 81, and a plurality of injection units 83 arranged on the heat-conducting block 82 from top to bottom;

[0033] The rear side of the heat-conducting block 82 is provided with a plurality of first counterbores 821 distributed sequentially from top to bottom, and the front side of the heat-conducting block 82 is provided with a same number of second counterbores 825 distributed sequentially from top to bottom, each second counterbore 825 is concentrically arranged with a corresponding first counterbore 821, the number of first counterbores 821 is equal to the number of injection units 83, and each injection unit 83 is arranged between a corresponding first counterbore 821 and a second counterbore 825;

[0034] The center of the bottom surface of each first counterbore 821 is provided with a second counterbore 822, and a feeding hole 823 is provided between the right outer wall of the heat-conducting block 82 and the inner wall of each second counterbore 822, and a through hole 824 is provided between the center of the bottom surface of each second counterbore 822 and the center of the bottom surface of a corresponding second counterbore 825;

[0035] The injection unit 83 comprises a storage cylinder 831 transversely and fixedly inserted in the movable mold plate 3, an opening and closing cylinder 834 fixedly arranged on the front side of the heat-conducting block 82 and located at the opening of the first counterbore 821, a telescopic rod 835 movably and sealingly inserted in the through hole 824, a heating wire 832 wound outside the storage cylinder 831, and a discharge nozzle 833 sealingly inserted in the opening of the storage cylinder 831.

[0036] The front end of the storage cylinder 831 is sealingly fixed to the rear side of the heat-conducting block 82, the opening of the front end of the storage cylinder 831 is in communication with the opening of the second counterbore 825, the inside of the discharge nozzle 833 is in communication with the inside of the storage cylinder 831, the telescopic end of the opening and closing cylinder 834 is transversely arranged at the front end of the telescopic rod 835, and the rear end of the telescopic rod 835 is sealingly inserted in the opening of the discharge nozzle 833.

[0037] A plurality of heating pipes 84 are fixedly arranged on the front and rear outer walls of the heat-conducting block 82.

[0038] A plurality of cross-shaped material guide grooves 44 are arranged on the end outer wall of the forming protrusion 41, and a same number of pressure cavities 33 are arranged on the bottom surface of the forming cavity 31, the number of cross-shaped material guide grooves 44 is equal to the number of injection units 83, and the opening of the discharge nozzle 833 in each injection unit 83 is in communication with the inside of a corresponding cross-shaped material guide groove 44.

[0039] An outlet groove 35 is arranged on the left and right side edges of the opening of each pressure cavity 33, and the left and right ends of each cross-shaped material guide groove 44 are respectively matched with a corresponding outlet groove 35.

[0040] The upper and lower edges of the end opening of each discharge slot 35 are outwardly formed with a distribution slot 36, and the outer edge of the opening of each distribution slot 36 is connected with the inner edge of the opening of a first forming inclined cavity 32 on the same side.

[0041] The left and right ends of each cross-shaped guide slot 44 are outwardly formed with a turning slot 45, and one end of each turning slot 45 is outwardly formed with a distribution cavity 46.

[0042] The injection unit 83 further comprises a heat insulation cylinder 836 fixedly sleeved on the storage cylinder 831, and the heating wire 832 is arranged in the heat insulation cylinder 836.

[0043] The end opening of the storage cylinder 831 is further sealingly connected with an air outlet nozzle 837, the discharge nozzle 833 is concentrically inserted into the air outlet nozzle 837, and the rear end of the telescopic rod 835 is sealingly and penetratingly arranged in the end opening of the air outlet nozzle 837.

[0044] The second forming inclined cavity 42 is further formed with a plurality of buckle forming cavities 43 arranged in sequence from top to bottom.

[0045] Working principle:

[0046] The end plate 1 is fixed together with the movable die plate 3, the melting plate 2 and the plurality of injection units 83 on the moving mechanism of the injection molding machine, the bottom plate 5 is fixed together with the fixed die plate 6 and the ejection mechanism 7 on the positioning base of the injection molding machine, the moving mechanism drives the end plate 1 to move towards the bottom plate 5 until the movable die plate 3 and the fixed die plate 6 are matched with each other, at this time, the forming concave cavity 31 and the forming protrusion 41 are matched with each other to make the opening of each second forming inclined cavity 42 respectively communicated with the openings of two first forming inclined cavities 32, and the above structure and principle are all prior art.

[0047] The molten material is simultaneously introduced into the feed hole 823 on each heat conduction block 82 through the runner arranged in the end plate 1, then the molten material is introduced into the storage cylinder 831 in the injection unit 83 through the second counterbore 822, in the initial state, the rear end of the telescopic rod 835 is sealingly and penetratingly arranged in the end opening of the discharge nozzle 833 and the air outlet nozzle 837, and the molten material in the storage cylinder 831 cannot be output; when the telescopic end of the on-off cylinder 834 is inwardly contracted, the telescopic rod 835 is driven to move forward, and then the rear end of the telescopic rod 835 is out of the end opening of the discharge nozzle 833 and the air outlet nozzle 837 and is retracted into the storage cylinder 831, so that the molten material can be outputted outwardly; in the above process, each heating pipe 84 and each heating wire 832 are all electrified to generate heat, the heat generated by the heating pipe 84 is transmitted to the molten material through the heat conduction block 82, and the heat generated by the heating wire 832 is transmitted to the molten material through the storage cylinder 831, so that the molten material can always maintain a molten state in the flowing process.

[0048] Thus, the molten material flowing out of each discharge nozzle 833 will flow into a corresponding cross-shaped guide channel 44, and then, with the cooperation of the compression cavity 33, enter the distribution cavity 46 via the turning groove 45, while part of the molten material will enter each distribution groove 36 via each discharge groove 35; finally, the molten material in the distribution cavity 46 and in each flow-through groove 34 will enter between each first forming inclined cavity 32 and a second forming inclined cavity 42 on the same side, and after cooling, two door trim strips 9 will be formed; when compressed air is introduced between the outer wall of the discharge nozzle 833 and the inner wall of the discharge nozzle 837, the compressed air will push the molten material to accelerate and pressurize the output.

[0049] After the molding is completed, the moving end plate 1 is driven away from the bottom plate 5 by the movement mechanism to separate the movable die plate 3 and the fixed die plate 6, and then the molding concave cavity 31 and the molding protrusion 41 are separated from each other, and finally the two door trim strips 9 are pushed forward by the ejection mechanism 7. The above structure and principle are also prior art.

[0050] The utility model discloses can first heating to restore the initial temperature of the molten material flowing through the runner with the heat conduction block 82 in the molten material component 8 and a plurality of heating pipes 84 fixed on the heat conduction block 82, and then the molten material about to enter the molding cavity is heated for the second time with the heating wire 832 in a plurality of injection units 83, and then the flowability of the molten material is effectively ensured, so that the molten material can quickly and fully fill the entire molding cavity, and the molding qualification rate is improved.

[0051] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model embodiments.

Claims

1. An injection mold for an automobile door trim strip, comprising an end plate and a bottom plate arranged in front and back respectively, a movable mold plate and a fixed mold plate fixed on the rear side of the end plate and the front side of the bottom plate respectively and cooperating with each other, a mold core embedded in the front side of the fixed mold plate, and an ejection mechanism arranged between the bottom plate and the fixed mold plate, characterized in that: a melt plate is further fixed between the end plate and the movable mold plate, and a melt assembly is further arranged in the melt plate, the melt assembly comprising a frame embedded in the melt plate, a heat-conducting block embedded in the frame, and a plurality of injection units arranged on the heat-conducting block in sequence from top to bottom. The rear side of the heat-conducting block is provided with a plurality of first counterbores arranged in sequence from top to bottom, and the front side of the heat-conducting block is provided with a same number of second counterbores arranged in sequence from top to bottom, each of the second counterbores is arranged concentrically with a corresponding first counterbore, the number of the first counterbores is equal to the number of the injection units, and each of the injection units is arranged between a corresponding first counterbore and a second counterbore. The center of the bottom surface of each of the first counterbores is provided with a second counterbore, and a feed hole is further provided between the right outer wall of the heat-conducting block and the inner wall of each of the second counterbores, and a through hole is further provided between the center of the bottom surface of each of the second counterbores and the center of the bottom surface of a corresponding second counterbore. The injection unit comprises a storage cylinder transversely and penetratingly fixed in the movable mold plate, an opening and closing cylinder fixed on the front side of the heat-conducting block and located at the opening of the first counterbore, a telescopic rod movably and sealingly penetratingly connected in the through hole, a heating wire wound outside the storage cylinder, and a discharge nozzle sealingly inserted in the internal part of the opening at the end of the storage cylinder. The front end of the storage cylinder is sealingly fixed on the rear side of the heat-conducting block, the opening at the front end of the storage cylinder and the opening of the second counterbore are in communication with each other, the internal part of the discharge nozzle and the internal part of the storage cylinder are in communication with each other, the telescopic end of the opening and closing cylinder is transversely arranged backward and concentrically fixed on the front end of the telescopic rod, and the rear end of the telescopic rod penetrates through the storage cylinder and is sealingly penetratingly arranged in the internal part of the opening at the end of the discharge nozzle. A plurality of heating pipes are further fixed on the outer walls of the front and rear sides of the heat-conducting block and arranged in sequence from top to bottom. The rear side of the movable mold plate is provided with a forming concave cavity, and the front side of the mold core is outwardly formed with a forming convex block cooperating with the forming concave cavity.

2. The injection mold for an automobile door trim according to claim 1, wherein The left and right inner walls of the forming concave cavity are each formed with a first forming inclined cavity arranged symmetrically, and the end of the forming convex block is formed with a second forming inclined cavity arranged symmetrically, and the two second forming inclined cavities cooperate with the two first forming inclined cavities respectively.

3. The injection mold for an automobile door trim according to claim 2, wherein The end outer wall of the forming convex block is further provided with a plurality of cross-shaped guide grooves arranged in sequence from top to bottom, and the bottom surface of the forming concave cavity is provided with a same number of pressing cavities arranged in sequence from top to bottom, and the number of the cross-shaped guide grooves is equal to the number of the injection units, and the end opening of the discharge nozzle in each of the injection units is in communication with the internal part of a corresponding cross-shaped guide groove.

4. The injection mold for an automobile door trim according to claim 3, wherein ​ 5. The injection mold for an automobile door trim according to claim 4, wherein The left and right side edges of the opening of each pressing cavity are provided with a discharging groove, and the two discharging grooves are respectively matched with the left and right ends of a corresponding cross-shaped guide groove.

6. The injection mold for an automobile door trim according to claim 5, wherein The upper and lower side edges of the end opening of each discharging groove are outwardly formed with a distribution groove, and the outer edge of the opening of each distribution groove is provided with a plurality of flow-through grooves between the inner side edge of the opening of a first forming inclined cavity on the same side.

7. The injection mold for an automobile door trim according to claim 4, wherein The left and right ends of each cross-shaped guide groove are outwardly formed with a turning groove, and one end of each turning groove is further outwardly formed with a distribution cavity.

8. The injection mold for an automobile door trim according to claim 1, wherein The injection unit further comprises a heat insulation cylinder fixed on the outside of the storage cylinder, and the heating wire is arranged in the inside of the heat insulation cylinder.

9. The injection mold for an automobile door trim according to claim 1, wherein The end opening of the storage cylinder is further sealed and connected with an air outlet nozzle, the discharging nozzle is concentrically inserted into the inside of the air outlet nozzle, and the rear end of the telescopic rod is sealingly and penetratingly arranged in the inside of the end opening of the air outlet nozzle.

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