Injection mold and injection molding device

Abstract

The utility model relates to the technical field of injection molding, and provides an injection mold and an injection device.The injection mold comprises a mold core and a pitched roof, the mold core forms a hot nozzle and a material well, and the material well communicates with the hot nozzle; the pitched roof comprises a first part, the first part and the mold core form a partial cavity wall of the mold cavity, the first part and the mold core jointly define a runner, the runner is communicated with the material well and the mold cavity, and a melt from the hot nozzle sequentially flows through the material well and the runner and then enters the mold cavity. The hot nozzle and the cavity are communicated through the material well and the flow channel, melt from the hot nozzle sequentially flows through the material well and the flow channel and then enters the cavity, the melt possibly having the risk of degradation or carbonization is left in the material well and the flow channel to form the first water gap and the second water gap respectively, and therefore the melt possibly having the risk of degradation or carbonization can be prevented from entering the cavity, and after demolding, the melt possibly having the risk of degradation or carbonization is prevented from entering the cavity. The first water gap and the second water gap can be removed, so that the first water gap and the second water gap are separated from the appearance product, and yellow lines and / or black lines at the pouring gate are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to an injection mold and an injection molding device. BACKGROUND

[0002] With the development of injection molding technology, the application of appearance injection products is more and more, for example, the front panel of an air conditioner indoor unit is usually an appearance product of injection molding. However, the appearance product of injection molding is prone to defects on the surface. The gate of the injection mold for feeding is usually on the back of the appearance product, and the gate of the appearance product is prone to defects such as black lines and / or yellow lines. SUMMARY

[0003] The embodiments of the present application provide an injection mold and an injection molding device. The hot nozzle and the cavity are communicated through the material well and the flow channel, which can block the melt with the risk of degradation or carbonization from entering the cavity, thereby reducing the yellow lines and / or black lines at the gate.

[0004] The technical scheme of the embodiments of the present application is implemented as follows:

[0005] The embodiments of the present application provide an injection mold, which comprises:

[0006] a mold core, which forms a hot nozzle and a material well, the material well being communicated with the hot nozzle;

[0007] an inclined ejector pin, which comprises a first part, the first part and the mold core constituting part of the cavity wall of a cavity, the first part and the mold core jointly defining a flow channel, the flow channel being communicated with the material well and the cavity, and the melt from the hot nozzle flowing through the material well and the flow channel in sequence and then entering the cavity.

[0008] In some embodiments, the cavity is located on a first side of the mold core in a first direction, the hot nozzle is located on a second side of the cavity in the first direction, the material well is located on a first side of the hot nozzle in the first direction, and the flow channel is located between the material well and the cavity, the first side and the second side being two sides opposite to each other in the first direction.

[0009] In some embodiments, a part of the flow channel extends along a second direction, and another part of the flow channel extends along the first direction, the second direction being perpendicular to the first direction.

[0010] In some embodiments, the flow channel comprises:

[0011] a first sub-section, which extends along a second direction, one end of the first sub-section in the second direction being communicated with the material well, the second direction being perpendicular to the first direction;

[0012] A second sub-section extending in the first direction, one end of the second sub-section being in communication with the one end of the first sub-section away from the well in the second direction, the other end of the second sub-section being in communication with the cavity.

[0013] In some embodiments, the first portion includes a first surface and a second surface, the first surface and the second surface being connected, the first surface facing a second side of the first direction, the second surface being perpendicular to the second direction, a portion of the first surface being recessed to form a first recess, a portion of the second surface being recessed to form a second recess, the first recess and the second recess each being co-defined with the core to define the runner, the second direction being perpendicular to the first direction.

[0014] In some embodiments, the well has a dimension in the first direction of H1, where 3mm≤H1≤5mm.

[0015] In some embodiments, the runner has a dimension in the first direction of H2, where 25mm≤H2≤35mm.

[0016] In some embodiments, the runner has a cross-sectional area of S, where 18mm2≤S≤75mm2.

[0017] In some embodiments, the well has a cross-sectional area that gradually increases in a direction away from the hot nozzle.

[0018] Embodiments of the present application also provide an injection molding device, comprising:

[0019] The injection molding mold of any one of the above;

[0020] An injection molding machine, the injection molding machine comprising a nozzle, the nozzle being configured to be connected with the hot nozzle, the hot nozzle being configured to receive melt from the nozzle.

[0021] The injection mold provided by the embodiments of the present application has the following advantages. On the one hand, the hot nozzle and the cavity are communicated through the material well and the runner, the melt from the hot nozzle flows through the material well and the runner in turn, and then enters the cavity, the melt with the risk of degradation or carbonization is left in the material well and the runner to form the first sprue and the second sprue respectively, so that the melt with the risk of degradation or carbonization can be blocked from entering the cavity, and after demolding, the first sprue and the second sprue can be removed, so that the first sprue and the second sprue are separated from the appearance product, thereby reducing the yellow lines and / or black lines at the gate. On the other hand, in the process of moving the appearance product out of the mold by the inclined ejector, the core remains relatively static, the material well is formed by the core alone, and the material well does not move with the inclined ejector. In the initial stage of the movement of the inclined ejector, the first part is separated from the core and no longer cooperatively surrounds the runner, the force exerted by the core on the first sprue can be greater than the adhesion force generated by the inclined ejector on the second sprue, the first sprue and the second sprue are connected, the first sprue can play a role of fixing the second sprue, the second sprue does not move with the inclined ejector, and the separation of the first part from the second sprue is promoted. With the continuous movement of the inclined ejector to push the appearance product, the first sprue, the second sprue and the appearance product are sequentially connected to form an integral whole, the force between the first sprue, the second sprue and the appearance product is greater than the force exerted by the core on the first sprue, and the appearance product drives the first sprue and the second sprue out of the core. In this way, the problem of the second sprue adhering to the inclined ejector in the process of the inclined ejector pushing the appearance product out of the mold is avoided, thereby avoiding friction damage and impurities falling off, and indirectly reducing the generation of yellow lines and / or black lines. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0023] Figure 2 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 1 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0024] Figure 3 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 2 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0025] Figure 4 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 3 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0026] Figure 5 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 1 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0027] Figure 6 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 5 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0028] Figure 7 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure; Figure 6 The structure schematic diagram of the injection mold provided by some embodiments of the present application is shown in the figure;

[0029] Reference Signs List

[0030] 1, mold core; 1a, hot nozzle; 1b, sprue well; 1c, runner; 101c, first sub-section; 102c, second sub-section; 2, inclined top; 21, first part; 21a, first surface; 21b, second surface; 22, second part; X, first direction; X1, first side; X2, second side; Y, second direction; 100, appearance product; 10, first water gap; 20, second water gap. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0034] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that, in the case of no contradiction, any suitable way can be combined, for example, different specific technical features / embodiments can form different embodiments by combination. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature / embodiment in the present application are not described again.

[0035] It should be noted that in the present application, the plurality includes two and more than two.

[0036] In the related art, the injection mold is inverted, that is, the melt is directly injected on the back of the appearance product through the hot nozzle. However, when the hot runner is directly inverted and injected, the hot runner is prone to black and / or yellow defects, which is difficult to solve, and the product has a high failure rate.

[0037] Please refer to Figures 1 to 4The embodiment of the present application provides an injection mold, which comprises a mold core 1 and an inclined ejector pin 2, the mold core 1 forms a hot nozzle 1a and a hopper 1b, the hopper 1b is communicated with the hot nozzle 1a; the inclined ejector pin 2 comprises a first part 21, the first part 21 and the mold core 1 constitute part of a cavity wall of a cavity, the first part 21 and the mold core 1 jointly define a runner 1c, the runner 1c is communicated with the hopper 1b and the cavity, and melt from the hot nozzle 1a sequentially flows through the hopper 1b and the runner 1c and then enters the cavity.

[0038] The embodiment of the present application provides an injection device, which comprises the injection mold in any one of the embodiments of the present application and an injection machine. The injection machine comprises a nozzle, the nozzle is used for being connected with the hot nozzle 1a, and the hot nozzle 1a is used for receiving melt from the nozzle.

[0039] ‌The injection machine is a device used for injecting melt formed by heating and melting plastic raw materials into an injection mold for molding. The nozzle is a component used for outputting melt by the injection machine.

[0040] The injection machine and the nozzle can adopt existing structures, and the present application is not limited.

[0041] The melt is plastic raw materials in a molten state.

[0042] The hot nozzle 1a is used for injecting melt, that is, the hot nozzle 1a is used for feeding, and the hot nozzle 1a can keep the melt in a molten state, so that cold material can be avoided.

[0043] Exemplarily, the hot nozzle 1a comprises a feeding chamber and a heating element, the feeding chamber is used for carrying melt, and the heating element is used for providing heat to keep the melt in the feeding chamber in a molten state. In this way, the heating element maintains the hot nozzle 1a at a set temperature, preventing the melt from cooling in the feeding chamber.

[0044] The cavity is a closed space formed by the injection mold, the cavity is used for forming an appearance product 100, the shape and size of the cavity match the appearance product 100, and the cavity is a space in which the melt is filled, cooled and solidified under the action of injection pressure.

[0045] The appearance product 100 refers to a product having an appearance surface, and the appearance surface is an external surface exposed to the outside and directly observed by a person.

[0046] In the embodiment of the present application, please refer to Figure 1 and Figure 5 , Figure 5A part of structure and the inclined top 2 of the appearance product 100 are shown in FIG. 1, the appearance product 100 can be a front panel of an air conditioner indoor unit, the air conditioner indoor unit is a device for adjusting indoor temperature and / or humidity in the room, in the use scene, the air conditioner indoor unit can be hung on the wall, the front panel is arranged at the end of the shell of the air conditioner indoor unit away from the wall, that is, the front panel is arranged at the front end of the shell of the air conditioner indoor unit facing the user, the surface of the front panel away from the wall, that is, the forward surface is the appearance surface, the back surface of the front panel away from the appearance surface is located in the interior of the shell and basically cannot be directly observed by personnel. In the embodiment of the application, the appearance product 100 is taken as the front panel for example, the front panel is roughly in the form of a plate, one end surface of the front panel in the thickness direction is the appearance surface, the other end surface of the front panel away from the appearance surface is the back surface, and the gate can be arranged on the back surface of the front panel. The gate can be part of the runner 1c connected to the cavity, which is the entrance of the melt into the cavity.

[0047] The mold core 1 constitutes part of the cavity wall of the cavity, that is, the mold core 1 is used to surround and form the cavity.

[0048] The inclined top 2 can move relative to the mold core 1, the inclined top 2 is an inclined ejection mechanism for demolding the appearance product 100, and the inclined top 2 can eject the appearance product 100 from the cavity along the intersecting direction of the demolding direction of the appearance product 100.

[0049] The first part 21 constitutes part of the cavity wall of the cavity, that is, the first part 21 is used to surround and form the cavity.

[0050] The first part 21 and the mold core 1 jointly define the runner 1c, in other words, the first part 21 and the mold core 1 can constitute all the wall surfaces of the runner 1c.

[0051] The material well 1b and the runner 1c can have no heat preservation function, and the temperature of the melt in the material well 1b and the runner 1c can be lower than the temperature of the melt in the hot nozzle 1a.

[0052] For ease of description, please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 and Figure 6 For ease of clear display of the first gate 10 and the second gate 20, the mold core 1 is not shown, the waste material remaining in the material well 1b after injection molding is defined as the first gate 10, and the waste material remaining in the runner 1c after injection molding is defined as the second gate 20.

[0053] In the injection mold production process, the melt from the hot nozzle 1a flows through the material well 1b and the runner 1c in turn, and then enters the cavity. After the melt solidifies in the cavity to produce the appearance product 100, the melt in the hot nozzle 1a stops feeding, the waste material remaining in the material well 1b is cooled and shaped to form the first water gate 10, and the waste material remaining in the runner 1c is cooled and shaped to form the second water gate 20. The inclined top 2 moves relative to the mold core 1 to eject the appearance product 100 from the cavity. Because the first part 21 is the structure of the inclined top 2, the first part 21 constitutes part of the wall of the runner 1c, so the inclined top 2 will generate a force on the second water gate 20 during movement. However, in this application, the mold core 1 remains relatively static during the process of the inclined top 2 pushing the appearance product 100 to move and demold, the material well 1b is formed by the mold core 1 alone, and the material well 1b does not move with the inclined top 2. In the initial stage of the movement of the inclined top 2, the first part 21 is separated from the mold core 1 and no longer cooperatively surrounds the runner 1c. The force exerted by the mold core 1 on the first water gate 10 can be greater than the adhesion force generated by the inclined top 2 on the second water gate 20. The first water gate 10 and the second water gate 20 are connected, the first water gate 10 can play a role in fixing the second water gate 20, the second water gate 20 does not move with the inclined top 2, and the separation of the first part 21 and the second water gate 20 is promoted; as the inclined top 2 continues to move to push the appearance product 100 to move, the first water gate 10, the second water gate 20 and the appearance product 100 are connected in turn to form a whole, the force between the first water gate 10, the second water gate 20 and the appearance product 100 is greater than the force exerted by the mold core 1 on the first water gate 10, and the appearance product 100 drives the first water gate 10 and the second water gate 20 to come out of the mold core 1. In this way, the problem of the second water gate 20 adhering to the inclined top 2 during the process of the inclined top 2 ejecting the appearance product 100 is avoided. If there is no material well 1b, there is no first water gate 10 to fix the second water gate 20, the inclined top 2 adheres to the second water gate 20, and the second water gate 20 is easily pulled during the movement of the inclined top 2; the carbonized material that may remain in the second water gate 20 is scraped off during adhesion, and these impurities enter the cavity with the subsequent melt, which has the risk of forming yellow lines and / or black lines. The material well 1b of the present application forms the first water gate 10, thereby limiting the position of the second water gate 20 by the first water gate 10, ensuring smooth separation of the second water gate 20 from the inclined top 2, avoiding the above friction damage and impurity falling, and indirectly reducing the generation of yellow lines and / or black lines.

[0054] The injection mold provided by the embodiments of the present application has the following advantages. On the one hand, the hot nozzle 1a and the cavity are communicated through the material well 1b and the flow channel 1c. The melt from the hot nozzle 1a flows through the material well 1b and the flow channel 1c in sequence and then enters the cavity. The melt that may have degradation or carbonization risks is likely to stay in the material well 1b and the flow channel 1c to form the first sprue 10 and the second sprue 20, respectively. In this way, the melt that may have degradation or carbonization risks is blocked from entering the cavity. After demolding, the first sprue 10 and the second sprue 20 can be removed, so that the first sprue 10 and the second sprue 20 are separated from the appearance product 100, thereby reducing the yellow marks and / or black marks at the gate. On the other hand, in the process of pushing the appearance product 100 to move for demolding by the inclined ejector pin 2, the core 1 remains relatively static. The material well 1b is formed by the core 1 alone and does not move with the inclined ejector pin 2. In the initial stage of the movement of the inclined ejector pin 2, the first part 21 is separated from the core 1 and no longer cooperatively surrounds the flow channel 1c. The force exerted by the core 1 on the first sprue 10 can be greater than the adhesion force generated by the inclined ejector pin 2 on the second sprue 20. The first sprue 10 and the second sprue 20 are connected, and the first sprue 10 can function to fix the second sprue 20, so that the second sprue 20 does not move with the inclined ejector pin 2, promoting the separation of the first part 21 and the second sprue 20. As the inclined ejector pin 2 continues to move to push the appearance product 100 to move, the first sprue 10, the second sprue 20 and the appearance product 100 are sequentially connected to form an integral whole. The force between the first sprue 10, the second sprue 20 and the appearance product 100 is greater than the force exerted by the core 1 on the first sprue 10. The appearance product 100 drives the first sprue 10 and the second sprue 20 to move out of the core 1. In this way, the problem of the second sprue 20 adhering to the inclined ejector pin 2 in the process of the inclined ejector pin 2 ejecting the appearance product 100 is avoided, thereby avoiding frictional damage and impurities falling off and indirectly reducing the generation of yellow marks and / or black marks.

[0055] In some embodiments, referring to Figures 1 to 4 , the cavity is located on the first side X1 of the core 1 in the first direction X, the hot nozzle 1a is located on the second side X2 of the cavity in the first direction X, the material well 1b is located on the first side X1 of the hot nozzle 1a in the first direction X, the flow channel 1c is located between the material well 1b and the cavity, and the first side X1 and the second side X2 are two opposite sides in the first direction.

[0056] In this embodiment, the first side X1 and the second side X2 are two opposite sides of the first direction X, the cavity is located at the first side X1 of the mold core 1 in the first direction X, the melt from the hot nozzle 1a flows in a direction generally close to the first side X1 of the first direction X, sequentially flows through the well 1b and the runner 1c, and gradually fills the cavity. The direction in which the first side X1 of the first direction X is located is the demolding direction of the appearance product 100. During the demolding process, the appearance product 100 moves toward the first side X1 of the first direction X, and the inclined ejector pin 2 ejects the appearance product 100 toward the first side X1 of the first direction X. The inclined ejector pin 2 can move toward the first side X1 of the first direction X and simultaneously move laterally toward a side perpendicular to the first direction X, so that the inclined ejector pin 2 can separate from the second nozzle 20 while ejecting the appearance product 100.

[0057] In some embodiments, referring to Figure 4 , a portion of the runner 1c extends along the second direction Y, and another portion of the runner 1c extends along the first direction X, and the second direction Y is perpendicular to the first direction X.

[0058] In this embodiment, the runner 1c is generally a curved runner 1c with one bending region, which can play a buffering role, so that the melt can flow more stably. When the melt enters the cavity through the runner 1c, it basically maintains a laminar flow state, reduces turbulence and vortex, and reduces the risk of air bubbles being rolled in to cause air marks at the gate.

[0059] In some embodiments, referring to Figure 4 and Figure 5 , the runner 1c includes a first sub-section 101c and a second sub-section 102c. The first sub-section 101c extends along the second direction Y, and one end of the first sub-section 101c in the second direction Y is connected to the well 1b. The second sub-section 102c extends along the first direction X, one end of the second sub-section 102c is connected to one end of the first sub-section 101c in the second direction Y away from the well 1b, and the other end of the second sub-section 102c is connected to the cavity.

[0060] Exemplarily, the first sub-section 101c is generally a linear channel extending along the second direction Y.

[0061] Exemplarily, the second sub-section 102c is generally a linear channel extending along the first direction X.

[0062] In this embodiment, the well 1b and the second sub-section 102c are connected to opposite ends of the first sub-section 101c in the second direction Y, and the first sub-section 101c and the cavity are connected to opposite ends of the second sub-section 102c in the first direction X. The melt from the hot nozzle 1a sequentially flows through the well 1b, the first sub-section 101c, and the second sub-section 102c, and then enters the cavity. In this way, the melt in the runner 1c first flows along the second direction Y and then flows along the first direction X, which plays a buffering role and enables the melt to flow more stably.

[0063] In some embodiments, referring to Figures 4 to 7 , the first part 21 comprises a first surface 21a and a second surface 21b, the first surface 21a and the second surface 21b are connected, the first surface 21a faces the second side X2 of the first direction X, the second surface 21b is perpendicular to the second direction Y, part of the first surface 21a is recessed to form a first groove, part of the second surface 21b is recessed to form a second groove, the first groove and the second groove jointly define the flow channel 1c with the mold core 1, and the second direction Y is perpendicular to the first direction X.

[0064] Exemplarily, the first groove and the mold core 1 enclose to form a first sub-section 101c. Part of the first end face of the first surface 21a towards the mold core 1 can abut the first surface 21a, and another part of the first end face can jointly enclose a space with the first groove to form the first sub-section 101c. Here, the other part of the first end face and the groove wall surface of the first groove are both wall surfaces of the first sub-section 101c.

[0065] Exemplarily, the second groove and the mold core 1 enclose to form a second sub-section 102c. Part of the second end face of the second surface 21b towards the mold core 1 can abut the second surface 21b, and another part of the second end face can jointly enclose a space with the second groove to form the second sub-section 102c. Here, the other part of the second end face and the groove wall surface of the second groove are both wall surfaces of the second sub-section 102c.

[0066] In this embodiment, the first groove and the second groove jointly define the flow channel 1c with the mold core 1, and by machining the first part 21 to form the first groove and the second groove, the manufacturing difficulty can be reduced.

[0067] In some embodiments, referring to Figures 5 to 7 , the inclined roof 2 comprises a second part 22, and the second part 22 extends from the first part 21 towards the second side X2 of the first direction X.

[0068] In this embodiment, the first part 21 and the second part 22 substantially constitute an L-shaped structure.

[0069] The connection mode of the first part 21 and the second part 22 is not limited, and exemplarily, the first part 21 and the second part 22 can be detachably connected, non-detachably connected, or integrally formed.

[0070] It should be noted that, unless otherwise stated, in this application, detachable connection includes but is not limited to screw connection, bolt connection, and / or clamping, etc. Non-detachable connection includes but is not limited to welding, bonding, and / or riveting, etc. Integrally formed means a structure formed by an integrally formed manufacturing process.

[0071] In some embodiments, the surface of the first part 21 facing the first side X1 of the first direction X is a part of the cavity wall surface of the cavity.

[0072] In some embodiments, the surface of the mold core 1 facing the first side X1 of the first direction X is a part of the cavity wall surface of the cavity.

[0073] In some embodiments, referring to Figure 4 , the size of the material well 1b in the first direction X is H1, wherein 3mm≤H1≤5mm.

[0074] Exemplarily, the size H1 of the material well 1b in the first direction X can be any value or a value between any two values among 3mm, 3.1mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm and 5mm.

[0075] In this embodiment, the size of the material well 1b in the first direction X is between 3mm and 5mm, the travel of the melt in the material well 1b is moderate, which can form a first nozzle 10 with moderate volume, thereby playing a good positioning role on the second nozzle 20, and is also conducive to the smooth exit of the first nozzle 10 from the material well 1b.

[0076] It should be noted that the unit "mm" is millimeter.

[0077] In the related art, if a vertical injection mold is used, the runner is introduced from the parting surface to the inside of the appearance product by using a slanted ejection pin, but such a runner is relatively long, has problems such as large pressure loss, difficult pressure retention during injection molding, small injection molding process range, often causes shrinkage defects of the appearance product, and has a high waste rate of the runner.

[0078] In some embodiments, referring to Figure 4 , the size of the runner 1c in the first direction X is H2, wherein 25mm≤H2≤35mm.

[0079] Exemplarily, the size H2 of the runner 1c in the first direction X can be any value or a value between any two values among 25mm, 26mm, 28mm, 30mm, 31mm, 32mm, 33mm, 34mm and 35mm.

[0080] In this embodiment, the size H2 of the runner 1c in the first direction X is between 25mm and 35mm, on the one hand, it can to some extent avoid the problems of large pressure loss and difficult pressure retention caused by the runner 1c being too long, and to some extent avoid causing the appearance product 100 to shrink; on the other hand, the melt has sufficient time to complete impurity settlement in the runner 1c, and at the same time, the residence time of the melt is moderate, the temperature gradient is small, so that the impurities are left in the runner 1c, thereby reducing the yellow and / or black lines at the gate.

[0081] In some embodiments, the flow passage 1c has a cross-sectional area S, wherein 18mm 2 ≤ S ≤ 75mm 2 .

[0082] Exemplarily, the flow passage 1c has a cross-sectional area S of any one of or between 18mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 50mm 2 , 60mm 2 , 65mm 2 , 70mm 2 , 73mm 2 and 75mm 2 .

[0083] In some embodiments, the flow passage 1c has a cross-sectional area S of any one of or between 18mm 2 and 75mm 2 . The flow rate of the melt flowing through the flow passage 1c is moderate, which can meet the requirements of cavity filling, and can control the shear heat and flow efficiency in a reasonable range to reduce the risk of black and yellow lines.

[0084] It should be noted that the unit "mm 2 " is square millimeter. The cross-sectional area perpendicular to the flow line cluster is the cross section orthogonal to all flow lines of the element flow or total flow. The cross-sectional area of the flow passage 1c is the cross-sectional area of the flow passage 1c perpendicular to the melt in the flow passage 1c.

[0085] In some embodiments, referring to Figure 4 , the flow passage 1c has a cross-sectional area of a rectangular shape, wherein the flow passage 1c has a short side with a size H3, wherein 3mm ≤ H3 ≤ 5mm.

[0086] The short side of the cross-sectional area of the flow passage 1c refers to the relatively shorter side of the rectangular shape.

[0087] Exemplarily, the short side of the cross-sectional area of the flow passage 1c has a size H3 of any one of or between 3mm, 3.1mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm and 5mm.

[0088] In some embodiments, the short side of the cross-sectional area of the flow passage 1c has a size H3 of any one of or between 3mm and 5mm, which can reduce the flow resistance of the melt, reduce friction and shear heat to avoid yellow lines, and can also make the melt flow uniformly and not easily stagnate to reduce black lines.

[0089] In some embodiments, the flow passage 1c has an elongated cross section, and the length of the flow passage 1c is H4, wherein 6mm≤H4≤15mm.

[0090] The length of the flow passage 1c refers to the longer side of the elongated cross section.

[0091] Exemplarily, the length of the flow passage 1c can be any value selected from 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm and 15mm, or any value between any two of the values.

[0092] In this embodiment, the length of the flow passage 1c is between 6mm and 15mm, which can reduce the melt flow resistance, reduce the friction and shear heat to avoid yellow lines, and make the melt flow uniformly to avoid black lines.

[0093] In some embodiments, the cross section of the material well 1b gradually increases in the direction away from the hot nozzle 1a.

[0094] Exemplarily, in the first direction X, the cross section of the material well 1b gradually increases from the second side X2 to the first side X1.

[0095] The cross section of the material well 1b refers to the cross section perpendicular to the melt in the material well 1b.

[0096] In this embodiment, during the demolding process, the appearance product 100 drives the second nozzle 20 and the first nozzle 10 to move away from the hot nozzle 1a, and the cross section of the material well 1b gradually increases in the direction away from the hot nozzle 1a, so that the cross section of the first nozzle 10 gradually increases in the direction away from the hot nozzle 1a, which is beneficial to the smooth demolding of the first nozzle 10 from the material well 1b.

[0097] The shape of the material well 1b is not limited, and exemplarily, the material well 1b can also be a hollow cylindrical shape or a prismatic shape, etc. Thus, the shape of the cross section of the material well 1b can be circular, elliptical or polygonal, etc., which is not limited in the present application.

[0098] In some embodiments, please refer to Figure 4 and Figure 5 The material well 1b is in the shape of a truncated cone.

[0099] In some embodiments, the hot nozzle 1a comprises a first body and a second body, the second body connecting the first body and the well 1b. The first body and the second body jointly define the feeding chamber. The first body has a communicating port at an end thereof facing away from the second body, the communicating port being in communication with the feeding chamber. The first body is configured to be connected to the nozzle, and the communicating port is configured to be in communication with the nozzle. The melt from the nozzle enters the feeding chamber through the communicating port.

[0100] The shape of the first body is not limited, and the first body may, for example, be substantially hollow cylindrical or prismatic, etc.

[0101] The shape of the second body is not limited, and the second body may, for example, be substantially conical with an open tip. That is, the cross-sectional area of the second body gradually decreases in a direction away from the first body.

[0102] In a specific embodiment, the core 1 forms the hot nozzle 1a and the well 1b, the well 1b being in communication with the hot nozzle 1a, the first part 21 and the core 1 jointly forming part of the cavity wall of the cavity, the first part 21 and the core 1 jointly defining the runner 1c, the runner 1c being in communication with the well 1b and the cavity, the melt from the hot nozzle 1a sequentially flowing through the well 1b and the runner 1c, and then entering the cavity. The cavity is located at a first side X1 of the core 1 in the first direction X, the hot nozzle 1a is located at a second side X2 of the cavity in the first direction X, the well 1b is located at a first side X1 of the hot nozzle 1a in the first direction X, the runner 1c is located between the well 1b and the cavity, the dimension H1 of the well 1b in the first direction X is between 3 mm and 5 mm, and the dimension H2 of the runner 1c in the first direction X is between 25 mm and 35 mm.

[0103] Here, the applicant has produced the above injection mold for about 100,000 mold times, and the injection mold has been produced smoothly without any jamming problem. It has been proved that the above injection mold can effectively reduce the risk of generating yellow and / or black lines at the gate.

[0104] In some embodiments, the injection mold comprises a fixed mold and a movable mold, the fixed mold and the movable mold being arranged along the first direction X, the fixed mold forming the first core slot, the movable mold forming the second core slot, the injection mold having an injection position and a demolding position. In the injection position, the movable mold is combined with the fixed mold, and the second core slot and the first core slot jointly form the core cavity. The core 1 and the first part 21 are both located in the core cavity. In the demolding position, the movable mold is separated from the fixed mold along the first direction X.

[0105] Specifically, the core 1, the first part 21, and the cavity wall of the core cavity jointly form the cavity. That is, the cavity wall of the core cavity constitutes part of the cavity wall of the cavity.

[0106] That is, in the demolding position, the movable mold moves relative to the fixed mold towards the first side X1 and separates from the fixed mold along the first direction X, and the appearance product 100 that has been injection molded can be taken out. In the injection molding position, the movable mold moves relative to the fixed mold towards the second side X2 until abutting against the fixed mold, and the movable mold and the fixed mold are closed to perform injection molding. The mold core cavity is formed by the second mold core groove and the first mold core groove, and in the state that the movable mold and the fixed mold are separated, the mold core 1 and the first part 21 can be partially installed into the second mold core groove or the first mold core groove, and after the movable mold and the fixed mold are closed, the mold core 1 and the first part 21 are completely embedded into the mold core cavity.

[0107] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. An injection mold characterized in that, The injection mold comprises: a mold core, the mold core forming a hot nozzle and a sprue well, the sprue well being in communication with the hot nozzle; a draft, the draft comprising a first part, the first part and the mold core constituting part of a cavity wall of a cavity, the first part and the mold core jointly defining a runner, the runner being in communication with the sprue well and the cavity, melt from the hot nozzle flowing through the sprue well and the runner in sequence and then into the cavity.

2. The injection mold of claim 1, wherein The cavity is located on a first side of the mold core in a first direction, the hot nozzle is located on a second side of the cavity in the first direction, the sprue well is located on a first side of the hot nozzle in the first direction, and the runner is located between the sprue well and the cavity, the first side and the second side being opposite sides in the first direction.

3. The injection mold of claim 2, wherein, A part of the runner extends along a second direction, and another part of the runner extends along the first direction, the second direction being perpendicular to the first direction.

4. The injection mold of claim 2, wherein, The runner comprises: a first sub-section, the first sub-section extending along the second direction, one end of the first sub-section in the second direction being in communication with the sprue well, the second direction being perpendicular to the first direction; a second sub-section, the second sub-section extending along the first direction, one end of the second sub-section being in communication with the end of the first sub-section in the second direction away from the sprue well, and the other end of the second sub-section being in communication with the cavity.

5. The injection mold of claim 2, wherein, The first part comprises a first surface and a second surface, the first surface and the second surface being connected, the first surface facing the second side of the first direction, and the second surface being perpendicular to the second direction, part of the first surface being recessed to form a first groove, and part of the second surface being recessed to form a second groove, the first groove and the second groove jointly defining the runner with the mold core, the second direction being perpendicular to the first direction.

6. The injection mold of claim 2, wherein, The sprue well has a dimension H1 in the first direction, wherein 3mm≤H1≤5mm.

7. The injection mold of claim 2, wherein The runner has a dimension H2 in the first direction, wherein 25mm≤H2≤35mm.

8. The injection mold of claim 2, wherein, The flow passage has a flow cross-section area S, where 18mm 2 ≤ S ≤ 75mm 2 .

9. The injection mold of claim 1, wherein, The area of the flow cross section of the sprue well gradually increases in a direction away from the hot nozzle.

10. An injection molding apparatus characterized by comprising: The injection mold comprises: The injection mold according to any one of claims 1 to 9; The injection molding machine comprises a nozzle, the nozzle being used to be connected with the hot nozzle, and the hot nozzle being used to receive melt from the nozzle.

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