Injection mold integrating multiple stations
By designing an array of mold cores and a hot runner system in a multi-station injection mold, combined with multiple venting channels and a sealing structure, the problems of trapped air and uneven material supply were solved, achieving efficient production and product consistency.
Patent Information
- Application Number
- CN202422860875.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Multi-station injection molds are prone to air entrapment during the filling process of molten plastic, which can lead to product defects and mold wear. In addition, traditional gating systems are difficult to achieve balanced material supply, affecting product consistency and mold life.
An array of mold cores and hot runner systems were designed, combined with multiple venting channels and sealing structures to ensure balanced feeding of molten plastic and smooth air discharge. The venting channels with a gradually expanding and arc-shaped transition structure are used to prevent melt leakage.
It improves product consistency and production efficiency, reduces waste and mold maintenance costs, and ensures smooth injection molding process and mold lifespan.
Smart Images
Figure CN223520082U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mould technical field, concretely is a kind of integrated multi-station injection mould. BACKGROUND
[0002] In modern injection molding industry, the production scale of plastic products is expanding and the structure is increasingly complex, and multi-station injection molding process emerges as the times require. Multi-station injection mold can complete molding operation in different stations in the same mold, which has significant advantages in improving production efficiency, reducing production cost and ensuring product consistency, so it has been widely used in many fields such as automobile parts, electronic appliances and medical devices.
[0003] However, with the application of multi-station injection mold, a series of technical challenges have also been brought. Among them, the gas trapping problem is particularly prominent. In the centralized layout of multi-station, the air in the mold cavity is difficult to discharge smoothly during the high-speed filling of molten plastic into each mold cavity. Due to the close arrangement of multi-station, the gas discharge path becomes complex and limited, and the traditional mold exhaust method cannot meet the needs of this complex working condition. Once the gas trapping phenomenon occurs, it will cause many adverse consequences. For example, gas trapping will cause bubbles, cavities and other defects in the product, which will seriously affect the mechanical properties and appearance quality of the product, and reduce the qualified rate of the product. Moreover, gas trapping will also cause unstable injection pressure, so that the mold is easy to wear when bearing uneven pressure, which shortens the service life of the mold, increases the maintenance cost and production downtime of the mold, and thus has a negative impact on the efficiency and economy of the whole production process.
[0004] In addition, the traditional multi-station injection mold also has certain limitations in the design of the gate system. The gate layout and runner design often cannot achieve precise and balanced feeding of multiple station mold cavities. Uneven feeding will cause differences in size accuracy, weight distribution and physical properties of products formed in different stations, which cannot meet the consistency requirements of high-quality products.
[0005] Therefore, it is necessary to propose an improved technical scheme to solve the above problems. UTILITY MODEL CONTENT
[0006] The utility model aims at providing a technical scheme that can solve the above problems.
[0007] A kind of integrated multi-station injection mold, including upper die and lower die, several array arrangement die cores are arranged between the upper die and lower die, the die core includes the upper die core that is connected to the upper die, and the lower die core that is connected to the lower die, multiple mold cavities for forming products are formed between the butt joint of the upper die core and the lower die core;
[0008] The upper die is connected with a hot runner plate away from one side of the lower die, a distribution runner plate is fixed on the hot runner plate, a main runner gate is arranged on the upper end face of the distribution runner plate, and a plurality of distribution hot nozzles in array arrangement are arranged on the lower end face of the distribution runner plate, the glue inlet of the plurality of distribution hot nozzles is communicated with the main runner gate through a runner, and the glue outlet of the plurality of distribution hot nozzles is in one-to-one abutting fit with a plurality of mold cores.
[0009] The first exhaust channel and the second exhaust channel are respectively formed in the length direction and the width direction of the plurality of lower die cores.
[0010] As a further scheme of the utility model, the first exhaust channel / second exhaust channel comprises a first exhaust groove located at one side edge of the parting surface of the lower die core, a second exhaust groove located at the other side edge of the parting surface of the lower die core, a third exhaust groove connected to the first exhaust groove and the second exhaust groove, and a gap groove between adjacent lower die cores.
[0011] The third exhaust groove is arranged on one side of the plurality of mold cavities.
[0012] As a further scheme of the utility model, the upper die core is provided with an annular sealing protrusion corresponding to the abutting position of the third exhaust groove and the mold cavity, and the sealing protrusion is in close contact with the lower die core when the mold cavity is closed.
[0013] As a further scheme of the utility model, the inner walls of the first exhaust groove, the second exhaust groove and the third exhaust groove are all provided with an anti-sticking coating.
[0014] As a further scheme of the utility model, the abutting area of the third exhaust groove and the mold cavity is in a gradually expanding structure, and the opening area of the end close to the mold cavity is larger than the opening area of the end away from the mold cavity.
[0015] As a further scheme of the utility model, the abutting area of the third exhaust groove and the mold cavity is in a semicircular arc transition structure.
[0016] Compared with the prior art, the utility model has the beneficial effects as follows:
[0017] By setting the array arrangement of the mold core between the upper mold and the lower mold, the upper mold core and the lower mold core are connected to form a plurality of mold cavities, the mold space is fully utilized to realize multi-station simultaneous molding, the product consistency is ensured, and the production efficiency is improved; the hot runner plate is connected with the distribution runner plate, the main flow gate is introduced into the molten plastic, the distribution hot nozzle is communicated with the array arrangement of the flow channel and the mold core, and the hot runner plate (system) keeps the plastic molten, reduces waste, and realizes balanced feeding of the mold cavity through the precise layout of the distribution hot nozzle, overcoming the shortcomings of the traditional gate system; the first exhaust channel and the second exhaust channel are arranged in the length and width directions of the lower mold core, respectively, to form an exhaust network, provide an effective exhaust path for the air in the multi-station concentrated layout of the lower mold cavity, and solve the problem of air trapping.
[0018] The additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0020] Figure 1 is a structural schematic diagram of the present application;
[0021] Figure 2 is a structural schematic diagram of the present application distribution runner plate and mold core cooperation;
[0022] Figure 3 is a structural schematic diagram of the mold core of the present application;
[0023] Figure 4 is Figure 3 is an enlarged structural schematic diagram of A in the present application;
[0024] Figure 5 is a structural schematic diagram of the upper mold core of the present application.
[0025] The reference signs and names in the drawings are as follows:
[0026] 1, upper mold; 2, lower mold; 3, upper mold core; 4, lower mold core; 5, mold cavity; 6, hot runner plate; 7, distribution runner plate; 8, main flow gate; 9, distribution hot nozzle; 10, first exhaust channel; 11, second exhaust channel; 12, first exhaust groove; 13, second exhaust groove; 14, third exhaust groove; 15, gap groove; 16, annular sealing protrusion; 17, arc-shaped transition structure. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0028] Please refer to Figures 1-5 In the embodiments of the utility model, an integrated multi-station injection mold comprises an upper mold 1 and a lower mold 2, a plurality of mold cores arranged in an array are arranged between the upper mold 1 and the lower mold 2, the mold cores comprise upper mold cores 3 connected to the upper mold 1 and lower mold cores 4 connected to the lower mold 2, a plurality of mold cavities 5 for forming products are formed between the butt joints of the upper mold cores 3 and the lower mold cores 4.
[0029] The side of the upper mold 1 away from the lower mold 2 is connected with a hot runner plate 6, the hot runner plate 6 is fixed with a distribution runner plate 7, the upper end face of the distribution runner plate 7 is provided with a main runner gate 8, the lower end face of the distribution runner plate 7 is provided with a plurality of distribution hot nozzles 9 arranged in an array, the glue inlet of the plurality of distribution hot nozzles 9 is communicated with the main runner gate 8 through a runner, and the glue outlet of the plurality of distribution hot nozzles 9 is in one-to-one butt joint with the plurality of mold cores.
[0030] The plurality of lower mold cores 4 are in close cooperation with each other, and a first exhaust passage 10 and a second exhaust passage 11 in communication are respectively formed along the length direction and the width direction of the plurality of lower mold cores 4.
[0031] In the technical solutions of the utility model, a plurality of mold cores arranged in an array are arranged between the upper mold 1 and the lower mold 2, the upper mold cores 3 and the lower mold cores 4 are precisely butt jointed, and a plurality of mold cavities 5 for forming products are constructed, the array type layout fully utilizes the space utilization efficiency of the mold, the molding operation of a plurality of products or multi-station products can be simultaneously carried out in the same injection molding cycle, the production efficiency is greatly improved, and since each mold cavity 5 is simultaneously formed in the same mold, the process conditions (such as temperature, pressure, injection speed, etc.) are basically consistent, the consistency of products is effectively ensured, and it has extremely important significance for industries (such as automobile parts, electronic appliances, etc.) with high requirements for product precision and consistency.
[0032] The hot runner plate 6, as a key supporting component of the whole sprue system, is closely connected with the runner plate 7, and the main runner 8 arranged on the upper end face of the runner plate 7 serves as the inlet of the molten plastic into the mold, receiving the high-temperature molten plastic from the injection molding machine, and the array of the distribution hot nozzles 9 arranged on the lower end face of the runner plate 7 is responsible for accurately distributing the molten plastic to each mold cavity 5. The inlet of the distribution hot nozzles 9 is communicated with the main runner 8 through the flow channel designed in the runner plate 7, and the outlet of the distribution hot nozzles 9 can correspond to the mold core one by one, ensuring that each mold cavity 5 can receive the molten plastic at the right time, with the right pressure and flow rate. The use of the hot runner system makes the plastic maintain a molten state throughout the injection molding process, avoiding the problem of solidified plastic waste in the flow channel of the traditional cold runner system, reducing the waste of raw materials, shortening the waste cleaning time in the injection molding cycle, and further improving the production efficiency. At the same time, this highly integrated and accurately designed sprue system can effectively overcome the defects of the traditional multi-station injection mold sprue layout and flow channel design, which is difficult to achieve accurate and balanced feeding of multiple station mold cavities 5, making the filling process of different station mold cavities 5 more stable and uniform, thereby ensuring that the product meets higher quality standards in terms of dimensional accuracy, weight distribution, and physical properties.
[0033] Considering the problem of complex and limited air exhaust path in the mold cavity 5 caused by the multi-station centralized layout, the first exhaust channel 10 and the second exhaust channel 11 are innovatively constructed in communication along the length direction and the width direction of the lower mold core 4 based on the structure of the lower mold core 4 closely matched with each other. The first exhaust channel 10 is arranged along the length direction of the lower mold core 4, which can collect the gas in each mold cavity 5 in this direction and guide it to the main pipe or the collection area of the exhaust system or exhaust to the outside. The second exhaust channel 11 is arranged along the width direction and interweaves with the first exhaust channel 10, forming an exhaust network covering the entire lower mold core 4 area of the mold. During the injection molding process, when the molten plastic fills each mold cavity 5 at high speed, the air in the mold cavity 5 will be squeezed and quickly exhausted along these exhaust channels. Since the layout of the exhaust channels is closely adapted to the distribution of the mold cavities 5 and is in communication with each other to form an efficient exhaust path, the gas can be exhausted from the mold cavity 5 at the shortest distance and the fastest speed, effectively avoiding the occurrence of air trapping. Specifically, the first exhaust channel 10 formed along the length direction of the lower mold core 4 is in communication with each other, and the second exhaust channel 11 formed along the width direction is also in communication with each other, forming a whole exhaust network system, so that the gas in each mold cavity 5 of the lower mold core 4 can be exhausted through this connected exhaust channel network, solving the problem of complex and limited air exhaust path under the multi-station centralized layout, and ensuring the smoothness and effectiveness of the exhaust of the whole mold during the injection molding process.
[0034] The first exhaust channel 10 / second exhaust channel 11 comprises a first exhaust groove 12 located at one side edge of the parting surface of the lower mold core 4, a second exhaust groove 13 located at the other side edge of the parting surface of the lower mold core 4, a third exhaust groove 14 connected to the first exhaust groove 12 and the second exhaust groove 13, and a gap groove 15 between adjacent lower mold cores 4.
[0035] The third exhaust groove 14 is arranged on one side of the plurality of mold cavities 5.
[0036] In the injection molding process, when the molten plastic fills the mold cavities 5, the air in the mold cavities 5 is extruded outward from the inside (the area near the center of the mold cavities 5 where the third exhaust groove 14 is located). The first exhaust groove 12 and the second exhaust groove 13 are located on the two side edges of the parting surface of the lower mold core 4, and their positions determine that they can receive the air extruded from the inside of the mold cavities 5. When the air flows from the third exhaust groove 14 to both sides, the first exhaust groove 12 and the second exhaust groove 13 act as two “collection pipes” to collect the air from different mold cavities 5 and the third exhaust groove 14. The entire exhaust process is a coordinated process. The third exhaust groove 14 mainly guides the air to be discharged outward from the inside of the mold cavities 5. It is arranged on one side of the plurality of mold cavities 5 to guide the air in each mold cavity 5 to be discharged. The first exhaust groove 12 and the second exhaust groove 13 collect and aggregate the air discharged from the third exhaust groove 14 on this basis. The gap groove 15 between adjacent lower mold cores 4 also plays a role in this process. It can balance the air pressure between different mold cavities 5 to ensure that the air can smoothly pass through the third exhaust groove 14 from the inside of the mold cavities 5, and then be collected into the first exhaust groove 12 and the second exhaust groove 13. For example, in some complex mold structures, there may be some mold cavities 5 that are difficult to exhaust. The gap groove 15 can make the air flow between adjacent mold cores, so that the air can be more evenly distributed and eventually collected into the exhaust grooves on the edge. Furthermore, the air collected in the first exhaust groove 12 and the second exhaust groove 13 will eventually be discharged through the external exhaust channel connected to them or directly discharged into the atmospheric environment outside the mold, thereby completing the entire exhaust process, effectively avoiding the air trapping phenomenon, and ensuring the smooth progress of the injection molding process and the product quality.
[0037] In the embodiment of the utility model, the upper mold core 3 is provided with an annular sealing protrusion 16 corresponding to the joint of the third exhaust groove 14 and the mold cavity 5. When the mold cavity 5 is closed, the sealing protrusion is in close contact with the lower mold core 4.
[0038] For the exhaust passage, the first exhaust groove 12, the second exhaust groove 13, the third exhaust groove 14 and the gap groove 15 between the adjacent lower mold core 4 cooperate to exhaust, wherein the upper mold core 3 is provided with an annular sealing protrusion 16 at the joint of the third exhaust groove 14 and the mold cavity 5, and in the closed mold state, due to the high pressure in the mold cavity 5 during the injection molding process, the plastic melt may leak along the exhaust passage, and the annular sealing protrusion 16 is in close contact with the lower mold core 4, which can effectively prevent the plastic melt from entering the exhaust passage, and the design is based on the sealing principle, that is, the annular sealing protrusion 16 is closely attached to the surface of the lower mold core 4 to form a physical barrier, and considering the annular shape of the annular sealing protrusion 16, the joint area of the exhaust passage and the mold cavity 5 can be surrounded in all directions to ensure that the melt leakage is prevented in all directions.
[0039] In the embodiment of the utility model, the inner wall of the first exhaust groove 12, the second exhaust groove 13 and the third exhaust groove 14 is provided with an anti-adhesion coating.
[0040] For the exhaust passage system, the first exhaust groove 12, the second exhaust groove 13 and the third exhaust groove 14 constitute the main exhaust path, and in the injection molding process, the air in the mold cavity 5 is discharged through these exhaust grooves, and since a small amount of molten plastic may contact the inner wall of the exhaust groove (the first exhaust groove 12, the second exhaust groove 13 and the third exhaust groove 14) during the exhaust process, the anti-adhesion coating is provided to prevent the plastic melt from adhering to the inner wall of the exhaust groove, and the material of the anti-adhesion coating usually has the characteristics of low surface energy, which can reduce the adhesion between the plastic melt and the inner wall of the exhaust groove, for example, some fluorine-containing polymer coating, the fluorine atom in the molecular structure can effectively prevent the plastic molecules from closely combining, so that the plastic melt contacting the inner wall of the exhaust groove is difficult to adhere to it.
[0041] In one embodiment of the utility model embodiment, the joint area of the third exhaust groove 14 and the mold cavity 5 is in a gradually expanding structure, and the opening area of the end close to the mold cavity 5 is larger than that of the end away from the mold cavity 5.
[0042] In the injection molding process, when the air in the mold cavity 5 is extruded, this gradually expanding structure is like a horn mouth, which provides a gradually expanding flow space for the air, according to the principle of fluid mechanics, when the fluid (here is air) enters a larger channel from a smaller channel, the flow rate of the fluid will decrease, and the pressure will also decrease accordingly, this structure design is to make the air in the mold cavity 5 more easily enter the third exhaust groove 14, reduce the resistance of the air entering the exhaust groove, because the air pressure in the mold cavity 5 will gradually increase with the filling of the plastic melt during the injection molding, the gradually expanding structure can better adapt to the pressure change, guide the air to smoothly enter the first exhaust passage 10 / second exhaust passage 11 from the mold cavity 5.
[0043] In one embodiment of the utility model embodiment, the third exhaust groove 14 and the butt joint area of the mold cavity 5 are semicircular arc transition structures 17.
[0044] From the perspective of fluid mechanics, this arc transition structure 17 can reduce the resistance of air flow, when the air in the mold cavity 5 is extruded to the third exhaust groove 14, the air flow direction can be smoothly changed when passing through the arc transition area, compared with the right angle or acute angle transition, the arc transition will not make the air flow produce violent vortex and turbulence, because in the process of fluid flow, sharp corners will cause energy loss and pressure drop, and the semicircular arc transition can guide the air to enter the third exhaust groove 14 along a smooth path, so that the air flow is more smooth and efficient, at the same time, this arc structure also considers the mechanical strength and manufacturing process of the mold, the semicircular arc is relatively simple and regular, which is easier to process in the mold manufacturing process, and can avoid stress concentration, in the injection molding process, the connecting area between the mold cavity 5 and the third exhaust groove 14 will bear a certain pressure and the erosion of plastic melt, the semicircular arc transition structure 17 can make the stress distribution of this area more uniform, reduce the risk of mold damage caused by stress concentration.
[0045] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.
Claims
1. An integrated multi-station injection mold, characterized in that, The upper die and the lower die are provided with a plurality of mold cores arranged in an array, the mold cores comprise upper mold cores connected to the upper die and lower mold cores connected to the lower die, and a plurality of mold cavities for forming products are formed between the abutting surfaces of the upper mold cores and the lower mold cores; The hot runner plate is connected to the side of the upper die away from the lower die, the hot runner plate is fixed with a distribution runner plate, the upper end surface of the distribution runner plate is provided with a main runner gate, and the lower end surface of the distribution runner plate is provided with a plurality of distribution hot nozzles arranged in an array, the glue inlet of the plurality of distribution hot nozzles is communicated with the main runner gate through a runner, and the glue outlet of the plurality of distribution hot nozzles is in one-to-one abutting cooperation with the plurality of mold cores; The plurality of lower mold cores are in close cooperation with each other, and a first exhaust channel and a second exhaust channel are formed in the length direction and the width direction of the plurality of lower mold cores, respectively.
2. The integrated multi-station injection mold of claim 1, wherein, The first exhaust channel / second exhaust channel comprises a first exhaust groove located at one side edge of the parting surface of the lower mold core, a second exhaust groove located at the other side edge of the parting surface of the lower mold core, a third exhaust groove connected to the first exhaust groove and the second exhaust groove, and a gap groove between adjacent lower mold cores. The third exhaust groove is arranged on one side of the plurality of mold cavities.
3. An integrated multi-station injection mold according to claim 2, wherein, The upper mold core is provided with an annular sealing protrusion corresponding to the abutting position of the third exhaust groove and the mold cavity, and the sealing protrusion is in close contact with the lower mold core when the mold cavity is closed.
4. The integrated multi-station injection mold of claim 2, wherein, The inner walls of the first exhaust groove, the second exhaust groove and the third exhaust groove are provided with an anti-sticking coating.
5. The integrated multi-station injection mold of claim 2, wherein, The abutting area of the third exhaust groove and the mold cavity is in a gradually expanding structure, and the opening area of the end close to the mold cavity is larger than the opening area of the end away from the mold cavity.
6. The integrated multi-station injection mold of claim 2, wherein, The abutting area of the third exhaust groove and the mold cavity is in a semicircular arc transition structure.