CN222844616U - A mold structure and injection mold for preventing gas backflow during injection molding - Google Patents
A mold structure and injection mold for preventing gas backflow during injection molding Download PDFInfo
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- CN222844616U CN222844616U CN202420993962.0U CN202420993962U CN222844616U CN 222844616 U CN222844616 U CN 222844616U CN 202420993962 U CN202420993962 U CN 202420993962U CN 222844616 U CN222844616 U CN 222844616U
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Abstract
本实用新型公开了一种注塑过程中防止气体回流的模具结构及注塑模具，包括上模仁、下模仁和浇筑系统，所述上模仁与下模仁彼此对接，合围后形成注塑模具产品的型腔，所述浇筑系统用于向型腔内部注入熔融塑料，待其冷却后形成模具产品；所述上模仁设有第一凹槽，所述下模仁设有第二凹槽，所述第一凹槽与第二凹槽彼此对接，合围形成流道系统，从而供熔融塑料在流道系统中流动，进而注入到型腔中；所述流道系统内还设有吹气组件，所述吹气组件用于向未完全冷却的模具产品中进行吹气操作，使其形成内部中空的塑料产品。综上所述，使注塑过程中可以顺利的进行吹塑操作，从而在薄型塑料产品中形成内部中空的设计，从而节省注塑原料，降低生产成本。
The utility model discloses a mold structure and an injection mold for preventing gas backflow during the injection molding process, including an upper mold core, a lower mold core and a pouring system, wherein the upper mold core and the lower mold core are butted against each other to form a cavity of the injection mold product after enclosing, and the pouring system is used to inject molten plastic into the cavity to form a mold product after cooling; the upper mold core is provided with a first groove, and the lower mold core is provided with a second groove, and the first groove and the second groove are butted against each other to form a flow channel system, so that the molten plastic can flow in the flow channel system and then be injected into the cavity; a blowing component is also provided in the flow channel system, and the blowing component is used to perform a blowing operation on the mold product that has not been completely cooled, so that it forms a plastic product with a hollow interior. In summary, the blow molding operation can be carried out smoothly during the injection molding process, so that an internal hollow design is formed in a thin plastic product, thereby saving injection molding raw materials and reducing production costs.
Description
Technical Field
The utility model relates to the technical field of air blowing processes of injection molds, in particular to a mold structure for preventing gas backflow in an injection molding process and an injection mold.
Background
In the conventional injection blow molding, a parison with a closed bottom is molded by an injection molding machine, and then the parison is moved into a blow molding die and compressed air is blown into the blow molding die to mold the parison, thereby obtaining a product. The product produced by the method has accurate size, high precision and no need of trimming because the mouth part is injection molded, has good strength because the bottom part has no blank cutting mouth, and can obtain the bottle with excellent appearance. In addition, the material loss is little, and the method is suitable for mass production of the same product. But has high equipment cost and is suitable for manufacturing fine-mouth bottles, pharmaceutical factory mouth bottles and the like.
Injection molding is a process of heating and melting plastic particles, filling the melted plastic particles into a mold, and then solidifying and forming the plastic particles through cooling. Blow molding is performed by placing heated plastic pellets into a mold and then blowing with compressed air to form an air-tight cavity and maintaining it in a shape and size.
Injection molding also differs greatly from blow molding in terms of the principle and process. The injection molding can produce various shapes, not only can produce thin-wall vessels, but also can produce complex plastic products such as plastic gears, electrical appliance shells and the like. The products produced by blow molding are mainly thin-walled containers such as bottles, barrels, water taps and the like.
The Chinese patent document with the bulletin number of CN219748891U discloses a novel blow molding die, which comprises two molding dies, wherein one side of each molding die is provided with a molding cavity, the top of each molding die is provided with a cooling mechanism, each cooling mechanism comprises a cooling cavity, the cooling cavities are arranged in the molding die, the top of each molding die is fixedly connected with a liquid storage tank, one side of each liquid storage tank is fixedly communicated with a connecting pipe, and one end of each connecting pipe is fixedly communicated with a control valve. This novel blowing mould, through setting up cooling body, two forming die carry out the compound die, then blow molding, after the blowing is accomplished, open the control valve for in the coolant liquid in the liquid reserve tank got into the cooling chamber, forming die adopted heat conduction material to make, the coolant liquid can cool down the blowing piece this moment, thereby reached and carried out refrigerated effect to the blowing piece, increased the efficiency of processing.
The injection molding process is directly carried out in the blow molding operation, so that an injection molding product with a hollow design inside is produced, which is one key point of research in the industry at present, but the injection molding process is directly carried out in the injection molding cavity, so that molten plastic is easily blown back into a nozzle or a barrel of a pouring system, and the subsequent injection molding operation is influenced.
Disclosure of utility model
The utility model aims to overcome the defects of the prior art and provides a technical scheme capable of solving the problems.
The utility model provides a mold structure for preventing gas backflow in an injection molding process, which comprises an upper mold core, a lower mold core and a pouring system, wherein the upper mold core and the lower mold core are in butt joint with each other, a cavity of an injection mold product is formed after the upper mold core and the lower mold core are surrounded, the pouring system is used for injecting molten plastic into the cavity to form the mold product after the molten plastic is cooled, the upper mold core is provided with a first groove, the lower mold core is provided with a second groove, the first groove and the second groove are in butt joint with each other, a runner system is formed after the first groove and the second groove are surrounded, so that the molten plastic flows in the runner system and is further injected into the cavity, and a blowing assembly is further arranged in the runner system and is used for blowing air into the mold product which is not cooled completely, so that the plastic product with hollow inside is formed.
As a further scheme of the utility model, an auxiliary structure is arranged in the runner system, the auxiliary structure is positioned in the runner between the blowing component and the pouring system, and the auxiliary structure is used for reducing the cross section area of the runner system, so that the wall thickness of molten plastic at the auxiliary structure is reduced, the molten plastic can be rapidly cooled, and a plastic blocking part for blocking gas is formed.
The auxiliary structure is further provided with a first lug and a second lug, wherein the first lug is fixedly connected inside the first groove, the second lug is fixedly connected inside the second groove, and when the first groove and the second groove are mutually abutted to form a runner system, the first lug and the second lug are mutually abutted synchronously to form the auxiliary structure with a certain clearance space.
The auxiliary structure is provided with a first structure and a second structure, the first structure is positioned in the first branch channel so as to block gas in the first branch channel, and the second structure is positioned in the second branch channel so as to block gas in the second branch channel.
The runner system is further provided with a first runner and a second runner, the first runner and the second runner are respectively positioned at one end of an injection molding cavity communicated with the first runner and the second runner and used for injecting molten plastics into the cavity, the blowing assembly is provided with a first air needle and a second air needle, the first air needle is positioned at a position, close to the first runner, in the first runner, so that gas is injected into an uncooled plastic product through the first runner to form an internally hollow plastic product, and the second air needle is positioned at a position, close to the second runner, in the second runner to inject gas into the uncooled plastic product through the second runner to form the internally hollow plastic product.
As a further scheme of the utility model, the first pouring gate and the second pouring gate are respectively positioned at the middle part of the thickness direction of the injection molding cavity, and blow air from the middle part of the thickness direction of the mold product to form the plastic product with hollow inside.
As a further scheme of the utility model, the runner system is also provided with a first cold material hole and a second cold material hole, wherein the first cold material hole is positioned at the tail end of the first sub runner, and the second cold material hole is positioned at the tail end of the second sub runner.
The utility model also provides an injection mold, which comprises the mold structure for preventing gas backflow in the injection molding process, and further comprises a mold frame system, a cooling system and an ejection system.
Compared with the prior art, the utility model has the beneficial effects that:
1. The blowing component is directly arranged in the runner system, so that the mold product which is not completely cooled is blown, the hollow plastic product in the interior can be smoothly formed, the relatively thin plastic product can be subjected to injection molding production, meanwhile, the structure of the injection molding cavity is optimized, the mold cavity can adapt to different shapes, and the problem that the production of the thin-wall container can only be carried out in the blow molding production is solved.
2. The auxiliary structure is further arranged in the runner system, so that the runner system between the blowing assembly and the pouring system is arranged in an auxiliary mode, the cross section area of the runner is reduced, molten plastic can be cooled rapidly, a plastic blocking part for blocking gas is formed, and therefore the phenomenon that the molten plastic flows back into the nozzle or the barrel due to backflow of the gas in the blowing process to influence the subsequent injection molding operation can be avoided.
Therefore, through the improvement, the utility model can provide the mold structure and the injection mold for preventing the gas from flowing back in the injection molding process, so that the blow molding operation can be smoothly performed in the injection molding process, thereby forming the hollow design in the thin plastic product, further saving the injection molding raw material and reducing the production cost.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the upper and lower mold cores of the present utility model;
FIG. 2 is a schematic diagram of the upper mold core of the present utility model;
FIG. 3 is a schematic diagram of the lower mold core of the present utility model;
FIG. 4 is a schematic view of the flow channel system and auxiliary structure of the present utility model;
FIG. 5 is a schematic view of the structure of the interstitial spaces of the present utility model;
fig. 6 is a schematic structural view of the plastic stopper of the present utility model.
Reference numerals and names in the drawings are as follows:
10 upper mold core, 11 first groove, 20 lower mold core, 21 second groove, 30 runner system, 31 first runner, 32 second runner, 33 first runner, 34 second runner, 35 first cold material hole, 36 second cold material hole, 40 auxiliary structure, 41 gap space, 42 first bump, 43 second bump, 50 blowing component, 51 first air needle, 52 second air needle, 60 casting system, 61 nozzle, 70 plastic product, 71 hollow inside, 72 plastic blocking part, 73 water gap piece.
Detailed Description
The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 6, in an embodiment of the present utility model, a mold structure for preventing gas backflow in an injection molding process includes an upper mold core 10, a lower mold core 20, and a pouring system 60, wherein the upper mold core 10 and the lower mold core 20 are abutted to each other, a cavity of an injection mold product is formed after surrounding, the pouring system 60 is used for injecting molten plastic into the cavity, forming a mold product after cooling, the upper mold core 10 is provided with a first groove 11, the lower mold core 20 is provided with a second groove 21, the first groove 11 and the second groove 21 are abutted to each other, a runner system 30 is formed for molten plastic to flow in the runner system 30 and then be injected into the cavity, and an air blowing assembly 50 is further provided in the runner system 30, and the air blowing assembly 50 is used for blowing air into the mold product which is not completely cooled, so as to form a plastic product 70 with a hollow interior 71.
Specifically, the improved mold structure of the utility model can be used in injection molds, including mold structures, and also including a mold frame system, a cooling system and an ejection system. In order to form the injection cavity, the upper mold core 10 and the lower mold core 20 are matched, so that a closed injection space can be formed by surrounding the upper mold core and the lower mold core when the mold is closed. The plastic product 70 is formed by pouring the corresponding molten liquid into the injection space by the pouring system 60 and cooling by the cooling system. The upper mold core 10 and the lower mold core 20 may be connected to a mold frame system, and perform mold opening or closing operations. The ejection system may perform an ejection operation on the cooled plastic product 70, allowing the injection cavity to be used for the next injection operation.
Secondly, in order to finish the manufacture of the hollow 71 inside the mold product, a blowing component 50 can be further arranged, and high-pressure nitrogen is injected into the cavity by using the blowing component 50, so that a hollow space is formed inside the mold product which is not completely cooled and shaped, and the actual production of the corresponding designed product is realized. It is understood that the blowing system can be connected to an external high-pressure nitrogen supply device through the die carrier system, so that high-pressure nitrogen is blown into the die cavity.
As shown in fig. 2, 3 and 6, it is preferable that an auxiliary structure 40 is further provided in the runner system 30, the auxiliary structure 40 is located in the runner between the blowing assembly 50 and the pouring system 60, and the auxiliary structure 40 is used to reduce the cross-sectional area of the runner system 30, so as to reduce the wall thickness of the molten plastic at the auxiliary structure 40, and make it possible to cool rapidly, so as to form a plastic blocking portion 72 for blocking the gas.
Specifically, the auxiliary structure 40 is fixedly connected to the inside of the runner system 30, preferably to the side wall of the runner, and is used for reducing the cross-sectional area of the runner, so that the cross-sectional area of the nozzle 73 formed in the injection molding process can be correspondingly reduced, the thinner area of the nozzle can be cooled in advance, the nozzle can be cooled to form a solid plastic blocking part 72, and the high-pressure nitrogen blown by the blowing assembly 50 is blocked, so that the high-pressure gas is prevented from blowing the molten plastic which is not completely cooled and shaped back to the inside of the nozzle 61 of the pouring system 60, and the problem that the nozzle 61 is blocked to affect production is avoided.
As shown in fig. 3 to 5, the auxiliary structure 40 is preferably provided with a first bump 42 and a second bump 43, wherein the first bump 42 is fixedly connected inside the first groove 11, the second bump 43 is fixedly connected inside the second groove 21, and when the first groove 11 and the second groove 21 are mutually jointed to form the runner system 30, the first bump 42 and the second bump 43 are mutually synchronously jointed to form the auxiliary structure 40 with a certain clearance space 41.
Specifically, the gap space 41 may enable the molten plastic to pass through the auxiliary structure 40 so as to enter the injection molding cavity, and when cooling, the molten plastic in the gap space 41 is relatively thin, so that the molten plastic can be cooled rapidly, and a solid plastic blocking portion 72 is formed after cooling, so that a runner at the position of the auxiliary structure 40 is blocked, and the gas blown by the blowing assembly 50 can be blocked, so that the molten plastic is prevented from flowing back into the nozzle 61 or the barrel due to gas backflow in the blowing process. The first and second protrusions 42 and 43 may be protrusions disposed in the runner of the upper and lower mold cores 10 and 20 in advance, or may be protrusions fixedly connected to the runner system 30 in a replaceable manner.
As shown in fig. 4, the runner system 30 is preferably provided with a first runner 31 and a second runner 32, the first runner 31 and the second runner 32 injecting molten plastic into the cavity from both ends, respectively, the auxiliary structure 40 is provided with a first structure and a second structure, the first structure is positioned inside the first runner 31 to block gas in the first runner 31, and the second structure is positioned inside the second runner 32 to block gas in the second runner 32.
In particular, in the present embodiment, since the mold product exhibits a relatively long shape, it is preferable to perform injection of molten plastic from both sides, respectively, so that both left and right sub-runners can be provided. Similarly, the auxiliary structure 40 needs to be provided with a first structure and a second structure, so that the two left and right flow paths are respectively blocked in an auxiliary manner, high-pressure gas cannot enter from the two flow paths, and the completely shaped molten plastic is blown back into the nozzle 61 of the pouring system 60, so that the nozzle 61 is prevented from being blocked. It will be appreciated that in other embodiments, or in the production of other mold products, where multiple sub-runners are required, multiple auxiliary structures 40 are also required, so that the auxiliary structures 40 assist in blocking each sub-runner to prevent clogging caused by high pressure gas blowing molten plastic into the retroreflective nozzle 61.
As shown in fig. 4, the runner system 30 is preferably further provided with a first runner 33 and a second runner 34, the first runner 33 and the second runner 34 are respectively positioned at one end of the first runner 31 and the second runner 32, which are communicated with the injection molding cavity, for injecting molten plastic into the cavity, the air blowing assembly 50 is provided with a first air needle 51 and a second air needle 52, the first air needle 51 is positioned near the first runner 33 in the first runner 31, so that air is injected into the plastic product 70 which is not completely cooled through the first runner 33 to form the plastic product 70 which is not completely cooled, and the second air needle 52 is positioned near the second runner 34 in the second runner 32, so that air is injected into the plastic product 70 which is not completely cooled through the second runner 34 to form the plastic product 70 which is not completely cooled.
Specifically, when the runner system 30 is provided with two runners, that is, when a plurality of runners are present, a plurality of air pins are also required to be provided, so that air is blown into the runners of the runners, respectively, so that the mold product which is not completely cooled and shaped in each runner can be blown out of the structure of the hollow interior 71 by high-pressure nitrogen. In order to enhance the blowing effect of the air pin, it is preferable to dispose the air pin at a position closer to the gate.
In addition, it is preferable that the first gate 33 and the second gate 34 are respectively located at the middle part in the thickness direction of the injection cavity, and blow air from the middle part in the thickness direction of the mold product to form the plastic product 70 having the hollow interior 71. In particular, in order to achieve relatively uniform blowing inside the mold product, particularly to ensure that the side walls of the hollow 71 portion inside the mold product have relatively the same wall thickness, it is preferable to set the gate in the middle position in the thickness direction of the mold product, thereby facilitating injection of the molten plastic and simultaneously facilitating blowing operation of the air needle inside the mold product through the gate.
The runner system 30 is further provided with a first cold material cavity 35 and a second cold material cavity 36, the first cold material cavity 35 is located at the end of the first runner 31, and the second cold material cavity 36 is located at the end of the second runner 32.
In particular, the cold pocket is mainly used in a plastic injection molding die for storing cold stubs generated during an injection interval. And a structure for preventing cold material from entering the cavity to affect the quality of the plastic part and enabling molten plastic to smoothly fill the cavity. The cold charge pocket is a prior art structure provided at the end of the main channel or the split channel for temporary storage of the front cold charge in the stream.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. The mold structure for preventing gas backflow in the injection molding process is characterized by comprising an upper mold core (10), a lower mold core (20) and a pouring system (60), wherein the upper mold core (10) and the lower mold core (20) are in butt joint with each other and form a cavity of an injection mold product after surrounding, the pouring system (60) is used for injecting molten plastic into the cavity to form the mold product after cooling, the upper mold core (10) is provided with a first groove (11), the lower mold core (20) is provided with a second groove (21), the first groove (11) and the second groove (21) are in butt joint with each other and form a runner system (30) for molten plastic to flow in the runner system (30) and then be injected into the cavity, and the runner system (30) is internally provided with an air blowing assembly (50) which is used for blowing air into the mold product which is not cooled completely to form a plastic product (70) with a hollow interior (71).
2. A mould structure for preventing gas backflow in an injection moulding process according to claim 1, characterized in that an auxiliary structure (40) is further provided in the runner system (30), the auxiliary structure (40) being located in the runner between the blowing assembly (50) and the casting system (60), the auxiliary structure (40) being arranged to reduce the cross-sectional area of the runner system (30) so as to reduce the wall thickness of the molten plastic at the auxiliary structure (40) so that it can be cooled down rapidly, forming a plastic plug (72) for blocking the gas.
3. The mold structure for preventing gas backflow in an injection molding process according to claim 2, wherein the auxiliary structure (40) is provided with a first bump (42) and a second bump (43), the first bump (42) is fixedly connected inside the first groove (11), the second bump (43) is fixedly connected inside the second groove (21), and when the first groove (11) and the second groove (21) are mutually abutted to form a runner system (30), the first bump (42) and the second bump (43) are mutually abutted synchronously to form the auxiliary structure (40) with a certain clearance space (41).
4. The mold structure for preventing gas backflow in an injection molding process according to claim 2, wherein the runner system (30) is provided with a first runner (31) and a second runner (32), molten plastic is injected into the cavity from two ends of the first runner (31) and the second runner (32), the auxiliary structure (40) is provided with a first structure and a second structure, the first structure is located inside the first runner (31) so as to block gas in the first runner (31), and the second structure is located inside the second runner (32) so as to block gas in the second runner (32).
5. The mold structure for preventing gas backflow in an injection molding process according to claim 4, wherein the runner system (30) is further provided with a first runner (33) and a second runner (34), the first runner (33) and the second runner (34) are respectively positioned at one end of the first runner (31) and the second runner (32) which are communicated with the injection molding cavity for injecting molten plastic into the cavity, the blowing assembly (50) is provided with a first gas needle (51) and a second gas needle (52), the first gas needle (51) is positioned near the first runner (33) in the first runner (31) so as to inject gas into the plastic product (70) which is not completely cooled through the first runner (33) to form the plastic product (70) which is hollow inside, and the second gas needle (52) is positioned in the second runner (32) at a position which is close to the second runner (34) to inject gas into the plastic product (70) which is not completely cooled to form the plastic product (70) which is hollow inside.
6. A mold structure for preventing back flow of gas in injection molding according to claim 5, wherein the first gate (33) and the second gate (34) are respectively located at the middle part in the thickness direction of the injection molding cavity, and blow air from the middle part in the thickness direction of the mold product to form a plastic product (70) having a hollow interior (71).
7. A mould structure for preventing gas backflow in an injection moulding process according to claim 4, characterized in that the runner system (30) is further provided with a first cold material cavity (35) and a second cold material cavity (36), the first cold material cavity (35) being located at the end of the first sub-runner (31) and the second cold material cavity (36) being located at the end of the second sub-runner (32).
8. An injection mold, comprising a mold structure for preventing gas backflow in an injection molding process according to any one of claims 1 to 7, and further comprising a mold frame system, a cooling system, and an ejection system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420993962.0U CN222844616U (en) | 2024-05-09 | 2024-05-09 | A mold structure and injection mold for preventing gas backflow during injection molding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420993962.0U CN222844616U (en) | 2024-05-09 | 2024-05-09 | A mold structure and injection mold for preventing gas backflow during injection molding |
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| CN222844616U true CN222844616U (en) | 2025-05-09 |
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| CN202420993962.0U Active CN222844616U (en) | 2024-05-09 | 2024-05-09 | A mold structure and injection mold for preventing gas backflow during injection molding |
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