An injection mold capable of eliminating surface flow lines on a plastic part

Abstract

The application discloses an injection mold capable of eliminating surface flow marks of plastic parts, comprising a movable mold and a fixed mold, the movable mold is connected with the fixed mold in an openable and closable mode, a product cavity is arranged at the connecting position of the movable mold and the fixed mold, a mold core is arranged in the fixed mold, the mold core can extend into the product cavity, a plurality of inserts are arranged in the mold core, an insert driving mechanism is arranged on the fixed mold, the insert driving mechanism is connected with all the inserts respectively, the insert driving mechanism can drive the inserts to slide in the mold core, and then the upper end faces of all the inserts can be flush with the upper end face of the mold core.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically to an injection mold capable of eliminating flow marks on the surface of plastic parts. Background Technology

[0002] Injection molding is the most common processing method in plastic parts manufacturing. In traditional plastic parts manufacturing, to improve the surface finish and aesthetics of the plastic products, a specific coating is usually sprayed onto the surface of the plastic parts after injection molding. This additional process inevitably increases production costs and reduces efficiency. To solve this problem, paint-free materials have emerged on the market. Using this material for injection molding allows the surface of the product to achieve the same effect as a sprayed coating.

[0003] Figure 1 and Figure 2 A charger casing for a household appliance is shown; the plastic part 100 is metallic in color and has a smooth surface. (Example) Figure 1 , 2 As shown, the upper surface of the plastic product 100 is smooth, and the inner cavity is provided with positioning pins 200 and screw pins 300. This means that when designing the injection mold of this product, corresponding slots must be designed on the product cavity inside the mold at the corresponding positions of the positioning pins 200 and screw pins 300.

[0004] like Figure 3 As shown, when processing this plastic part using an existing injection mold, after the injection molding machine injects liquid rubber into the product cavity, the rubber first fills the upper surface of the product. Then, the rubber flows into the slots corresponding to the locating pins 200 and screw pins 300. Once the slots of the locating pins 200 and screw pins 300 are filled, the rubber flows back to the upper surface of the product, causing the rubber to converge on the upper surface. Figure 3 The direction of the middle arrow indicates the flow trajectory of the adhesive within the product cavity. Because adhesives that do not require spraying generally have poor flowability, when two streams of adhesive with different flow rates converge on the upper surface of the product, flow marks will form on the upper surface, resulting in a poor product appearance. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides an injection mold capable of eliminating flow marks on the surface of plastic parts, comprising a moving mold and a fixed mold, wherein the moving mold and the fixed mold are closable, and a product cavity is provided at the connection between the fixed mold and the moving mold. A mold core is provided inside the fixed mold and can extend into the product cavity. Multiple inserts are provided inside the mold core, and an insert driving mechanism is provided on the fixed mold. The insert driving mechanism is connected to all the inserts respectively, and the insert driving mechanism can drive the inserts to slide within the mold core, thereby making the upper end face of all the inserts flush with the upper end face of the mold core.

[0006] As a further improvement of the present invention, the insert driving mechanism includes a driving member and an insert mounting plate. The driving member is connected to the rear mold, the output end of the driving member is connected to the insert mounting plate, and the inserts are respectively connected to the insert mounting plate.

[0007] As a further improvement of the present invention, the insert includes a first insert and a second insert, the first insert and the second insert being connected to the insert mounting plate respectively, the number of the first insert being the same as the number of positioning posts on the plastic product, and the number of the second insert being the same as the number of screw posts on the plastic product.

[0008] As a further improvement of the present invention, a limiting block is sleeved on the first insert, and a limiting groove is provided on the lower end surface of the insert mounting plate at the corresponding position of the first insert. The first insert can slide in the limiting groove. A limiting plate is provided on the lower end surface of the insert mounting plate, and the first insert can pass through the limiting plate. The limiting block can abut against the end faces of the limiting plate and the limiting groove respectively.

[0009] As a further improvement of the present invention, the moving mold is provided with a moving mold core, the product cavity is disposed on the lower end surface of the moving mold core, and a heating tube is disposed inside the moving mold core, the heating tube being distributed around the periphery of the product cavity.

[0010] As a further improvement of the present invention, a heat insulation plate is sleeved around the periphery of the moving mold core, and the heat insulation plate abuts against the outer periphery and the upper end surface of the moving mold core respectively.

[0011] As a further improvement of the present invention, the outer side wall and the upper end surface of the moving mold core are respectively provided with hollow grooves, and the heat insulation plate is provided with protrusions at the corresponding positions of the hollow grooves. The protrusions are adapted to the shape of the corresponding hollow grooves, and the protrusions are inserted into the corresponding hollow grooves for limiting connection.

[0012] As a further improvement of the present invention, cooling water pipes are respectively provided in the moving mold and the fixed mold, and the cooling water pipes are respectively distributed around the mold core and the moving mold core. Water inlet connectors and water outlet connectors are respectively provided on the outer side walls of the moving mold and the fixed mold, and the water inlet connectors and water outlet connectors are respectively connected to the corresponding cooling water pipes.

[0013] As a further improvement of the present invention, the product cavity has two parts, and a flow channel is provided at the connection between the fixed mold and the moving mold, and the flow channel is respectively connected to the two product cavities.

[0014] As a further improvement of the present invention, the lower end surface of the moving mold is provided with a plurality of positioning grooves, and the fixed mold is provided with positioning blocks at corresponding positions to the positioning grooves, and the positioning blocks are detachably snapped into the corresponding positioning grooves.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention, by setting inserts and insert driving mechanisms within the fixed mold, enables the injection molding process to control the material to first fill the upper surface of the product, and then fill the slots corresponding to the positioning posts and screw posts. By injecting the material into the product cavity in two steps, it avoids the material from diverting and flowing back within the product cavity during the injection molding process, thereby preventing flow marks from forming on the surface of the plastic part, improving the yield rate of processing, and meeting the needs of high-quality, large-volume processing.

[0017] During injection molding, the inserts are first driven upwards within the mold core by an insert drive mechanism, aligning their upper surfaces with the upper surface of the mold core. This temporarily blocks the slots corresponding to the locating pins and screw posts. The product cavity is then a flat surface. When the product cavity is filled with resin, the resin flows across this flat surface without splitting or merging, thus preventing flow marks. Once the upper surface of the product is completely filled, the insert drive mechanism drives the inserts downwards, retracting them back into the mold core and exposing the slots corresponding to the locating pins and screw posts. The resin then continues to flow into these slots, filling them completely. Finally, cooling and molding completes the injection molding of one product. Attached Figure Description

[0018] To more clearly illustrate the solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the product structure processed according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the product processed according to another embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the flow process of the adhesive material in the product cavity in the prior art;

[0022] Figure 4 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the fixed mold in an embodiment of the present invention;

[0024] Figure 6 This is a top view of the fixed mold structure in an embodiment of the present invention;

[0025] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure of the middle AA section;

[0026] Figure 8 yes Figure 7 Enlarged structural diagram of section C;

[0027] Figure 9 yes Figure 7 Enlarged structural diagram of section D in the middle;

[0028] Figure 10 yes Figure 9 A schematic diagram showing the first insert in the mold core after it has risen and is flush with the upper surface of the mold core.

[0029] Figure 11 yes Figure 6 Schematic diagram of the cross-sectional structure of the middle BB section;

[0030] Figure 12 This is a schematic diagram of the three-dimensional structure of the moving mold in an embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram of the exploded structure of the moving mold core in an embodiment of the present invention. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order.

[0033] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] like Figure 4-13As shown, an injection mold capable of eliminating flow marks on the surface of a plastic part includes a moving mold 1 and a fixed mold 2. The moving mold 1 and the fixed mold 2 are closable. A product cavity 3 is provided at the connection between the moving mold 1 and the fixed mold 2. The product cavity 3 is respectively provided on the lower end face of the moving mold 1 and the upper end face of the fixed mold 2. A mold core 4 is provided on the fixed mold 2, and a moving mold core 5 is provided on the moving mold 1. The product cavity 3 is provided on the lower end face of the moving mold core 5. The mold core 4 can extend into the product cavity 3 inside the moving mold core 5. When the mold core 4 extends into the product cavity 3 of the moving mold core 5, a cavity adapted to the shape of the product is formed between the inner side wall of the moving mold core 5 and the side wall of the mold core 4.

[0036] During processing, the moving mold 1 and the fixed mold 2 are respectively installed on the injection molding machine. The injection molding machine can drive the moving mold 1 to move closer to or away from the fixed mold 2, thereby making the moving mold 1 and the fixed mold 2 seal and connect or separate, realizing the mold closing and mold opening actions. After the injection molding machine drives the mold to close, the feeding mechanism injects the rubber material into the product cavity 3. After cooling and molding, the plastic part product conforming to the predetermined shape is processed.

[0037] In this embodiment, the product cavity 3 is two, enabling the injection mold to simultaneously mold two plastic parts after one mold closing and opening, thus improving processing efficiency. In other embodiments, the number of product cavities 3 can be arbitrary.

[0038] The mold core 4 and the moving mold core 5 are respectively provided with runners 6, which are connected to the two product cavities 3. The upper surface of the moving mold 1 is provided with a sprue 101, which is connected to the feeding mechanism of the injection molding machine and is connected to the runners 6. During processing, the feeding mechanism of the injection molding machine injects liquid material into the moving mold 1 through the sprue 101. The liquid material then flows into the runners 6 and then into the two product cavities 3 for injection molding.

[0039] The core 4 contains multiple inserts, each of which is respectively connected to... Figure 2The positioning pins 200 and screw pins 300 in the mold are one-to-one. The fixed mold 2 is equipped with an insert driving mechanism, which is connected to all the inserts. The insert driving mechanism can drive all the inserts to slide within the mold core 4, so that the upper surface of all the inserts can be flush with the upper surface of the mold core 4. When the injection mold is processed, before injecting the plastic material, the inserts are driven upward by the insert driving mechanism, so that the upper surface of all the inserts is flush with the upper surface of the mold core 4. At this time, it is equivalent to the inserts sealing the slots corresponding to the positioning pins 200 and screw pins 300 on the product. The product cavity 3 is a plane. When liquid plastic material is injected into the product cavity 3 by the injection molding machine, the plastic material will not split or merge when flowing through the plane, and thus no flow marks will be generated. After the upper surface of the product is completely filled, the insert is driven downward by the insert drive mechanism, causing the insert to retract into the mold core 4, exposing the slots corresponding to the positioning pins 200 and screw pins 300. The plastic material will continue to flow into the slots corresponding to the positioning pins 200 and screw pins 300, filling the positioning pins 200 and screw pins 300. Finally, cooling and molding are performed to complete the injection molding of a product.

[0040] During the injection molding process, the liquid adhesive fills the product cavity 3 in two steps: first, the upper surface of the product is filled, and then the positioning posts 200 and screw posts 300 are filled. This avoids the formation of flow marks in the product cavity 3 due to the splitting and merging of the adhesive during the injection process, thus improving the yield rate of injection molding.

[0041] like Figure 7-11 As shown, specifically, the insert driving mechanism includes a driving component 7 and an insert mounting plate 8. The driving component 7 is fixedly mounted on the fixed mold 2, and its output end is fixedly connected to the insert mounting plate 8. The inserts include a first insert 9 and a second insert 10, which are respectively connected to the insert mounting plate 8. The number of first inserts 9 is the same as the number of positioning pins 200 on the plastic product, and the number of second inserts 10 is the same as the number of screw pins 300 on the plastic product. In this embodiment, there are two mold cores 4, and each mold core 4 corresponds one-to-one with the product cavity 3. Each mold core 4 contains 7 first inserts 9 and 4 second inserts 10. During operation, the driving component 7 drives the insert mounting plate 8 to move up and down within the fixed mold 2, thereby causing the first inserts 9 and second inserts 10 to move up and down together.

[0042] like Figure 2 As shown, the positioning post 200 and the screw post 300 in the product have different heights. In order to drive the first insert 9 and the second insert 10 to be flush with the upper end face of the mold core 4 at the same time, the distance of the first insert 9 rising and returning to its original position must be less than the distance of the second insert 10 rising and returning to its original position during actual processing.

[0043] In this embodiment, a limiting block 11 is sleeved on the outer side of the first insert 9. A limiting groove 81 is provided on the upper end of the insert mounting plate 8 at the corresponding position of the first insert 9. The limiting groove 81 is adapted to the limiting block 11, and the first insert 9 can slide in the limiting groove 81. A limiting plate 12 is provided on the lower end surface of the insert mounting plate 8. The limiting plate 12 is fixedly connected to the insert mounting plate 8 by screws. The first insert 9 can pass through the limiting plate 12, and the limiting block 11 can abut against the end faces of the limiting plate 12 and the limiting groove 81 respectively.

[0044] In the initial state, the limiting block 11 abuts against the end face of the limiting groove 81. During processing, the driving component 7 drives the insert mounting plate 8 to move upward, and the insert mounting plate 8 drives the second insert 10 to rise synchronously, so that the second insert 10 extends into the slot corresponding to the screw post 300 in the product cavity 3, sealing it, until the upper end face of the second insert 10 is flush with the upper end face of the mold core 4. During the upward movement of the insert mounting plate 8, the limiting plate 12 moves synchronously. In the initial stage of the upward movement, the first insert 9 will not move upward, and the limiting block 11 will remain in the limiting groove 81. The material slides inward until the end face of the limiting block 11 abuts against the limiting plate 12. Then, as the insert mounting plate 8 continues to move upward, the limiting plate 12 will drive the first insert 9 to move upward together, so that the first insert 9 extends into the slot corresponding to the positioning post 200 in the product cavity 3 and seals it. When the upper end face of the second insert 10 is flush with the upper end face of the mold core 4, the upper end face of the first insert 9 is also flush with the upper end face of the mold core 4, so that the product cavity 3 becomes a plane. Then, the glue is injected into the product cavity 3 to form the upper surface of the product. After the upper surface of the product is filled with adhesive, the drive component 7 drives the insert mounting plate 8 to move downward. The insert mounting plate 8 drives the second insert 10 to descend synchronously, causing the second insert 10 to retract into the mold core 4, exposing the slot in the product cavity 3 corresponding to the screw post 300. In the initial stage of the insert mounting plate 8 moving downward, the first insert 9 will not move, and the limiting block 11 will slide in the limiting groove 81 until the end face of the limiting block 11 abuts against the end face of the limiting groove 81. Then, as the insert mounting plate 8 continues to move downward, it will drive the first insert 9 to move downward together, causing the first insert 9 to retract into the mold core 4, exposing the slot in the product cavity 3 corresponding to the positioning post 200. After the slots corresponding to the positioning post 200 and the screw post 300 are exposed, the liquid adhesive will flow into the slots by itself, filling them completely, thus completing the adhesive filling of the entire product cavity 3.

[0045] The injection mold, through the cooperation of the limiting groove 81, the limiting block 11 and the limiting plate 12, enables the driving component 7 to drive the insert mounting plate 8 to move, which in turn drives the first insert 9 and the second insert 10 to move, and enables the first insert 9 and the second insert 10 to be flush with the upper end surface of the mold core 4 at the same time; by using a few driving components 7 to asynchronously drive the movement of multiple inserts, the number of driving components 7 is reduced, and the manufacturing cost of the mold is reduced.

[0046] In this example, the driving component 7 is a cylinder, and there are four driving components 7 arranged in a rectangular shape within the fixed mold 2. In other embodiments, a driving component 7 can be connected to each of the first insert 9 and the second insert 10, and the corresponding first insert 9 and the second insert 10 can be moved by each driving component 7. This eliminates the need for structures such as the insert mounting plate 8, the limiting block 11, and the limiting plate 12.

[0047] like Figure 12 , 13 As shown, a heating element 13 is installed inside the moving mold core 5. The heating element 13 is used to heat the moving mold core 5 by connecting an external heat source. The heating element 13 is located around the product cavity 3, surrounding and above the product cavity 3. During processing, the heating element 13 is connected to the heating mechanism of the injection molding machine. The injection molding machine controls the heating element 13 to heat up, thereby heating the moving mold core 5 to achieve the function of heated injection molding. The heating element 13 can heat the moving mold core 5 to 150-160℃, while in traditional injection molding, the molding temperature of the mold is generally only 40-80℃. In this embodiment, heating the moving mold core 5 can improve the fluidity of the liquid rubber in the product cavity 3, thereby further reducing the possibility of flow marks on the product surface and improving the molding yield of paint-free plastic parts.

[0048] A heat insulation plate 14 is fitted around the moving mold core 5, and the heat insulation plate 14 abuts against the outer walls and upper surface of the moving mold core 5. The heat insulation plate 14 is made of calcium carbonate composite material. The titanium alloy material has good heat insulation performance, which can reduce the heat loss from the moving mold core 5, thereby reducing the energy consumption for heating, which is in line with the current mainstream trend of environmental protection. By setting the heat insulation plate 14 on the moving mold core 5, the injection mold can reduce the heat loss of the moving mold core 5, thereby reducing the energy consumption for heating the moving mold 1; moreover, heating only the moving mold core 5 will also shorten the cooling and molding time and improve the efficiency of injection molding.

[0049] To further reduce heating energy consumption, in this embodiment, multiple hollow slots 51 are provided on the outer side wall of the moving mold core 5. The hollow slots 51 are distributed on the four sides of the moving mold core 5 and on the end face of the moving mold core 5 away from the fixed mold 2. Protrusions 15 are provided on the heat insulation plate 14 at corresponding positions to the hollow slots 51, and the shape of the protrusions 15 matches the shape of the corresponding hollow slots 51. When the heat insulation plate 14 is installed on the moving mold core 5, the protrusions 15 engage and limit the connection with the corresponding hollow slots 51. By providing multiple hollow slots 51 on the moving mold core 5, the volume of the moving mold core 5 can be reduced. Reducing the volume of the moving mold core 5 naturally reduces the energy consumption for heating the moving mold core 5 to the predetermined temperature, thereby reducing the overall energy consumption of the injection mold.

[0050] Cooling water pipes 16 are respectively installed inside the moving mold 1 and the fixed mold 2. The cooling water pipes 16 are distributed around the mold core 4 and the moving mold core 5. Water inlet connectors 21 and water outlet connectors 22 are respectively installed on the outer walls of the moving mold 1 and the fixed mold 2, and the water inlet connectors 21 and 22 are connected to the corresponding cooling water pipes 16. During operation, the water inlet connectors 21 and 22 are connected to the cooling system of the injection molding machine. The cooling water can flow from the water inlet connector 21 into the cooling water pipes 16 through the cooling water pipes 16, then flow through the cooling water pipes 16 to the water outlet connector 22, and then flow back into the cooling system of the injection molding machine, realizing the water circulation of cooling water. After the product in the product cavity 3 is formed, the injection molding machine controls the cooling system to work. The cooling water pipe 16 contacts the moving mold core 5 and the mold core 4 respectively. The cooling water in the cooling water pipe 16 will exchange heat with the moving mold core 5 and the mold core 4, thereby carrying away the heat of the moving mold core 5 and the mold core 4, so as to cool down the moving mold core 5 and the mold core 4, so that the product in the product cavity 3 can be cooled and formed quickly.

[0051] Four positioning grooves 102 are provided on the lower end face of the moving mold 1, two of which are distributed horizontally and the other two are distributed vertically. Positioning blocks 23 are provided on the fixed mold 2 at corresponding positions to the positioning grooves 102, and the positioning blocks 23 are detachably engaged with the positioning grooves 102. During the mold closing process, the positioning blocks 23 can be engaged into the corresponding positioning grooves 102. Through the cooperation between the positioning grooves 102 and the positioning blocks 23, the moving mold 1 and the fixed mold 2 can be sealed together, improving the accuracy of the mold closing transmission and preventing misalignment of the moving mold 1 and the fixed mold 2 during processing.

[0052] The above-described specific embodiments are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes but is not limited to the specific embodiments described herein. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. An injection mold capable of eliminating flow marks on the surface of plastic parts, characterized in that: The device includes a moving mold and a fixed mold, which are closable. A product cavity is provided at the connection between the fixed mold and the moving mold. A mold core is provided inside the fixed mold and can extend into the product cavity. Multiple inserts are provided inside the mold core. An insert driving mechanism is provided on the fixed mold and is connected to all the inserts. The insert driving mechanism can drive the inserts to slide inside the mold core, so that the upper surface of all the inserts can be flush with the upper surface of the mold core. The insert driving mechanism includes a driving component and an insert mounting plate. The driving component is connected to the fixed mold, and the output end of the driving component is connected to the insert mounting plate. The inserts are respectively connected to the insert mounting plate. The insert includes a first insert and a second insert, which are respectively connected to the insert mounting plate. The number of the first inserts is the same as the number of positioning posts on the plastic product, and the number of the second inserts is the same as the number of screw posts on the plastic product. A limiting block is fitted onto the first insert. A limiting groove is provided on the lower end face of the insert mounting plate at the corresponding position of the first insert. The first insert can slide in the limiting groove. A limiting plate is provided on the lower end face of the insert mounting plate. The first insert can pass through the limiting plate. The limiting block can abut against the end faces of the limiting plate and the limiting groove respectively. Initially, the limiting block abuts against the end face of the limiting groove. During processing, the driving component drives the insert mounting plate to move, and the insert mounting plate drives the second insert and the limiting plate to move synchronously. The second insert extends into the product cavity until its upper end face is flush with the upper end face of the mold core. At the same time, the limiting block slides in the limiting groove. When the end face of the limiting block abuts against the limiting plate, the limiting plate drives the first insert to move together, so that the first insert extends into the product cavity. When the upper end face of the second insert is flush with the upper end face of the mold core, the upper end face of the first insert is also flush with the upper end face of the mold core. After the upper surface of the product is filled with adhesive, the drive unit drives the insert mounting plate to move the second insert synchronously until the second insert retracts into the mold core, exposing the slot corresponding to the screw post in the product cavity. At the same time, the limit block slides in the limit groove. When the end face of the limit block abuts against the end face of the limit groove, the limit plate drives the first insert to move until the first insert retracts into the mold core, exposing the slot corresponding to the positioning post in the product cavity. After the slots corresponding to the positioning post and screw post are exposed, the liquid adhesive will flow into the slots by itself, filling them completely, thus completing the adhesive filling of the entire product cavity.

2. The injection mold capable of eliminating flow marks on the surface of plastic parts according to claim 1, characterized in that: The moving mold is provided with a moving mold core, the product cavity is located on the lower end surface of the moving mold core, and a heating tube is provided inside the moving mold core, with the heating tubes distributed around the periphery of the product cavity.

3. The injection mold capable of eliminating flow marks on the surface of plastic parts according to claim 2, characterized in that: The moving mold core is surrounded by a heat insulation plate, which abuts against the outer walls and the upper surface of the moving mold core.

4. The injection mold capable of eliminating flow marks on the surface of plastic parts according to claim 3, characterized in that: The outer wall and upper surface of the moving mold core are respectively provided with hollow grooves. The heat insulation plate is provided with protrusions at the corresponding positions of the hollow grooves. The protrusions are adapted to the shape of the corresponding hollow grooves and are inserted into the corresponding hollow grooves for limiting connection.

5. The injection mold capable of eliminating flow marks on the surface of plastic parts according to claim 2, characterized in that: Cooling water pipes are provided in the moving mold and the fixed mold respectively. The cooling water pipes are distributed around the mold core and the moving mold core. Water inlet connectors and water outlet connectors are provided on the outer side walls of the moving mold and the fixed mold respectively. The water inlet connectors and water outlet connectors are respectively connected to the corresponding cooling water pipes.

6. The injection mold capable of eliminating flow lines on the surface of a plastic part according to any one of claims 1-5, characterized in that: The product has two cavities, and a flow channel is provided at the connection between the fixed mold and the moving mold. The flow channel is connected to the two product cavities respectively.

7. The injection mold capable of eliminating flow marks on the surface of plastic parts according to claim 6, characterized in that: The lower end face of the moving mold is provided with multiple positioning grooves, and the fixed mold is provided with positioning blocks at corresponding positions of the positioning grooves. The positioning blocks are detachably snapped into the corresponding positioning grooves.

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