CN219768995U - Injection mold - Google Patents
Injection mold Download PDFInfo
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- CN219768995U CN219768995U CN202321369774.2U CN202321369774U CN219768995U CN 219768995 U CN219768995 U CN 219768995U CN 202321369774 U CN202321369774 U CN 202321369774U CN 219768995 U CN219768995 U CN 219768995U
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- injection
- runner
- injection molding
- cavity
- die
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- 238000002347 injection Methods 0.000 title claims abstract description 68
- 239000007924 injection Substances 0.000 title claims abstract description 68
- 238000001746 injection moulding Methods 0.000 claims abstract description 69
- 229920003023 plastic Polymers 0.000 claims abstract description 13
- 239000004033 plastic Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The utility model relates to the field of injection molds and discloses an injection mold, which comprises a movable mold, a fixed mold and an injection molding system, wherein a cavity is arranged between the movable mold and the fixed mold and comprises a back cavity, the back cavity is provided with an injection port, and the injection molding system injects plastic into the cavity through the injection port. After injection molding is finished, the injection molding part does not need to be trimmed, so that the processing efficiency of the injection molding part is improved.
Description
Technical Field
The utility model relates to the field of injection molds, in particular to an injection mold.
Background
With the rapid development of the automobile industry, especially the urgent need for the expansion of the domestic small automobile market, each big host factory requires to improve the production efficiency of the product. The plastic part is applied to different fields by the characteristics of light weight and changeable shape and structure, and is widely applied to the automotive interior shell, but due to the requirements of the automotive interior shell on use and installation, the injection molding part used for the automotive interior shell has high requirements on appearance, but the injection molding process inevitably leaves a water gap.
In the prior art, the technical scheme for solving the problem of the water gap of the injection part is generally to change a needle valve type runner, but because part of injection part has a complex structure, as shown in fig. 5 and 6, the surface of the injection part has a step-type height difference, and the basic principle is based on the design of a die: 1. the rows of the combined cavities are arranged as balanced as possible so that the molten plastic can fill each cavity in a balanced manner; 2. the arrangement of the cavity and the set position of the pouring gate enable the mold to be stressed uniformly in the injection molding process as much as possible, so the injection nozzle is generally arranged on the same plane, but due to the fact that the stepped height difference exists on the surface of the part, a certain height difference is necessarily formed between the injection nozzle of the needle valve type runner and the low position of the part, a convex column is formed on the surface of the part after injection molding, the appearance of a product is seriously influenced, the convex column is needed to be sheared off in a manual or mechanical mode, and the production efficiency of the injection molded part is influenced.
Disclosure of Invention
The utility model aims to provide an injection mold for improving the production efficiency of injection molded parts.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the injection mold comprises a movable mold, a fixed mold and an injection molding system, wherein a cavity is arranged between the movable mold and the fixed mold and comprises a back cavity, the back cavity is provided with an injection molding opening, and the injection molding system injects plastic into the cavity through the injection molding opening.
The beneficial effect of this scheme is: for injection molding parts, the water gap is generally left at the position of the injection molding opening during injection molding, which results in influencing the appearance of the injection molding parts, the traditional solution for solving the problem that the water gap on the surface of the injection molding parts is influenced by the appearance of the parts is to increase a needle valve on the basis of a hot runner, free opening and closing of a nozzle are realized by means of the needle valve, the trace of a valve gate on a part is smooth and is only equivalent to the trace left by an ejector pin, but when the injection molding parts are excessively complex in structure, particularly when the surface of the parts is stepped, even if the needle valve type runner is used, the surface of the parts is provided with the height difference, the stress of the injection molding parts is uniform in the injection molding process, the heights of a plurality of injection molding nozzles are always equal, and a certain distance is reserved between the injection molding nozzles and the surface of the stepped low position of the parts, so that even if the needle valve type runner is used, the problem that the protruding column appears on the surface of the injection molding parts cannot be solved.
Further, back die cavity and cover half fixed connection, injection molding system set up in the cover half, and injection molding system includes heating element and injection molding unit, and heating element includes hot runner board, is provided with the heater strip in the hot runner board, and the die cavity still includes positive die cavity, and positive die cavity and movable mould fixed connection are provided with hydraulic drive unit below the movable mould, and hydraulic drive unit drives the movable mould up-and-down motion.
The beneficial effects are that: the hot runner plate is used for heating the runner, so that the temperature of plastics in the runner is guaranteed, the injection molding pressure is reduced, if 200 tons of pressure is needed for injection molding during injection molding of the cold runner, the hot runner injection molding can be realized only by 90-120 tons, energy is saved, meanwhile, the injection molding system is arranged in the fixed mold, and when the injection molding system is used, the fixed mold cannot move, and the damage to a pipeline caused by repeated pulling of a feeding pipeline of the injection molding system during repeated mold opening and closing can be prevented, so that leakage occurs during the pressurizing process.
Further, the unit of moulding plastics includes runner and injection molding portion, and the runner includes sprue and reposition of redundant personnel runner, and the sprue transversely sets up on the hot runner board and runs through the hot runner board, and injection molding portion includes a plurality of notes mouth and runner, notes mouth and runner one-to-one, and the runner setting is on annotating the mouth, and the sprue includes at least one export, reposition of redundant personnel runner intercommunication export and runner.
The beneficial effects are that: through the arrangement of the multiple outlets of the main runner, a plurality of parts can be molded at one time.
Further, the fixed die and the movable die are internally provided with ejection units which are in sliding connection with the die cavity.
The beneficial effects are that: the back cavity is fixedly connected with the fixed die in a sliding manner, the front cavity is fixedly connected with the movable die, the movable die and the fixed die are opened and closed together with the movable die and the fixed die when the movable die and the fixed die are opened and closed, the step of opening and closing the cavity independently is saved, and meanwhile, the injection molded part after injection molding is ejected through the ejection unit when the die is opened, so that the production efficiency is accelerated.
Further, the heating unit still includes hot plate and heated board, and the hot plate setting is in the outside of annotating the mouth, heated board parcel hot plate.
The beneficial effects are that: the heating plate and the heat-insulating plate are arranged on the injection nozzle, so that the temperature reduction of the plastic in the injection nozzle is avoided, the temperature and the fluidity of the molten plastic before the molten plastic is injected into the cavity are ensured, and the injection molding quality is improved.
Further, the runner is a needle valve runner, and the injection molding system further comprises a pressure generating unit, wherein the pressure generating unit drives a needle valve of the needle valve runner to move up and down to open and close the needle valve runner.
The beneficial effects are that: after injection molding is finished, the nozzle can be shortened through the needle valve of the needle valve type runner, and the attractiveness of injection molded parts is further improved.
Further, the flow channel is an open flow channel.
The beneficial effects are that: because the die feed inlet is positioned at the back of the part, the water gap generated by the open runner injection molding process is also positioned at the back of the part, on one hand, the water gap can be used as a connecting piece with other parts, and on the other hand, the space for arranging the needle valve and a driving piece for driving the needle valve in the die is omitted, so that the volume of the die can be further compressed, the volume of the die is reduced, and the production cost and the later maintenance cost of the die are reduced.
Drawings
FIG. 1 is an exploded view of example 1 of the present utility model;
FIG. 2 is an exploded view of the case with the stationary mold removed in accordance with embodiment 1 of the present utility model;
FIG. 3 is an exploded view of example 2 of the present utility model;
FIG. 4 is an exploded view of the case with the stationary mold removed in accordance with embodiment 2 of the present utility model;
FIG. 5 is a three-dimensional comparison of an injection molded part obtained in accordance with an embodiment of the present utility model with an injection molded part obtained in accordance with conventional injection molding;
FIG. 6 is a three-dimensional comparison of an injection molded part assembly according to an embodiment of the present utility model with an injection molded part assembly obtained by conventional injection molding.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the injection molding machine comprises a fixed mold 1, a hydraulic cylinder 11, a heating unit 13, a feed port 14, a movable mold 2, a front cavity 31, a back cavity 32, an injection port 321, a front injection part 41, a back injection part 42, an injection part main body 43, a front injection part assembly 411, a back injection part assembly 421, a boss 44 and an injection nozzle 5.
Example 1
Embodiment 1 is basically as shown in fig. 1-2, and an injection mold as shown in fig. 1-2 comprises a fixed mold 1 and a movable mold 2, wherein a cavity is arranged between the movable mold 2 and the fixed mold 1, and the movable mold 2, the cavity and the fixed mold 1 are sequentially arranged from bottom to top.
The fixed die 1 is internally provided with an injection molding system, as shown in fig. 2, the injection molding system comprises a heating unit 13, an injection molding unit and a pressurizing unit, the heating unit 13 comprises a hot runner plate, a heating plate and a heat insulation plate, the injection molding unit comprises a runner and two groups of injection molding parts, the runner comprises a main runner and two groups of sub runners, the main runner comprises two outlets, the main runner is transversely arranged and penetrates through the hot runner plate, the sub runners are communicated with the outlets of the main runner, each group of injection molding parts comprises four injection nozzles 5, needle valves are arranged in each injection nozzle 5, the sub runners are communicated with the outlets and the injection nozzles 5, the heating plate wraps the injection nozzles 5, the heating plate and the heating plate are internally provided with heating pipes, the heat insulation plate wraps the hot runner plate and the heating plate, so that the temperature control of molten plastics is further improved, the fluidity of plastics is improved, the pressurizing unit comprises a hydraulic part and two groups of hydraulic cylinders 11, and the hydraulic cylinders 11 are in one-to-one correspondence with the injection molding parts and control the opening and closing of the needle valves.
As shown in fig. 1-2, the cavity comprises a front cavity 31 and a back cavity 32, the back cavity 32 is fixedly connected with the fixed die 1 through a bolt, the front cavity 31 is fixedly connected with the movable die 2 through a bolt, an injection molding opening 321 is formed in the upper surface of the back cavity 32, and the injection molding opening 321 is matched with the injection nozzle 5.
A hydraulic lifting unit is arranged in the movable die 2, and the hydraulic lifting unit drives the movable die 2 to move up and down.
The specific implementation process is as follows:
when the injection molding part is used, 1. The front surface of the injection molding part main body 43 is downward and is fixedly connected with the front surface cavity 31, the front surface cavity 31 is fixedly connected with the movable die 2, the back surface cavity 32 is fixedly connected with the fixed die 1, and the heating unit 13 is started to preheat the hot runner plate and the heating plate;
2. starting a hydraulic lifting unit of the movable die 2 to enable the movable die 2 to be matched with the fixed die 1;
3. starting a hydraulic cylinder 11 of an injection molding system, and opening a needle valve through the hydraulic cylinder 11;
4. starting a pressurizing part of the injection molding system, wherein the pressurizing part applies pressure (90-120T) to an internal runner of the injection molding system, molten plastic enters an injection mold from a feed port 14 and sequentially passes through a main runner, a shunt runner and a gate to enter a cavity to form a back injection part assembly 421;
5. after injection molding is completed, starting an injection molding system hydraulic cylinder 11, and closing a needle valve through the hydraulic cylinder 11;
6. and cooling and demolding to obtain the back injection molded part 42.
As shown in fig. 5-6, when injection molding is performed on an injection molded part with a relatively complex structure, the injection molded part is generally split into an injection molded part main body 43 and an injection molded part assembly, and compared with a front injection molded part assembly 411 of a front injection molded part 41 obtained by injection molding operation from the front of the injection molded part main body 43, the surface of the back injection molded part 42 has no protruding post 44, so that the surface is more attractive, the structural strength and the installation of the injection molded part are not affected, the subsequent trimming is not needed, and the processing efficiency of the injection molded part is accelerated.
Example 2
The embodiment 2 is basically shown in fig. 3-4, and is different from the embodiment 1 in that the embodiment is an open hot runner, no needle valve is arranged in the injection nozzle 5, and two groups of hydraulic cylinders 11 matched with the needle valve are removed, so that the volume of an injection mold is further reduced, the mold cost is reduced, the quality and the appearance of injection molded parts are not affected, and meanwhile, a water gap formed by the open runner can be used as a connecting positioning column for other parts, so that the cost is saved, and the production efficiency is accelerated.
The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that the technical means for solving the problems in the above-mentioned embodiments of the present utility model may be combined to solve a plurality of technical problems at the same time, and it is also possible for those skilled in the art to make several modifications and improvements without departing from the technical solution of the present utility model, which should also be regarded as the protection scope of the present utility model, and these should not affect the implementation effect of the present utility model and the practical applicability of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. The utility model provides an injection mold, includes movable mould, cover half and injection molding system, is provided with die cavity, its characterized in that between movable mould and the cover half: the cavity comprises a back cavity, the back cavity is provided with an injection port, and the injection system injects plastic into the cavity through the injection port.
2. An injection mold according to claim 1, wherein: the back cavity is fixedly connected with the fixed die, the injection molding system is arranged in the fixed die and comprises a heating unit and an injection molding unit, the heating unit comprises a hot runner plate, a heating wire is arranged in the hot runner plate, the cavity further comprises a front cavity, the front cavity is fixedly connected with the movable die, a hydraulic transmission unit is arranged below the movable die, and the hydraulic transmission unit drives the movable die to move up and down.
3. An injection mold according to claim 2, wherein: the injection molding unit comprises a runner and an injection molding part, the runner comprises a main runner and a diversion runner, the main runner is transversely arranged on the hot runner plate and penetrates through the hot runner plate, the injection molding part comprises a plurality of injection nozzles and pouring gates, the injection nozzles and the pouring gates are in one-to-one correspondence, the pouring gates are arranged on the injection nozzles, the main runner comprises at least one outlet, and the diversion runner is communicated with the outlet and the pouring gates.
4. An injection mold according to claim 3, wherein: ejection units are arranged in the fixed die and the movable die, and are in sliding connection with the die cavity.
5. An injection mold according to claim 4, wherein: the heating unit also comprises a heating plate and an insulation plate, the heating plate is arranged on the outer side of the injection nozzle, and the insulation plate wraps the heating plate.
6. An injection mold as claimed in claim 5, wherein: the runner is a needle valve runner, and the injection molding system further comprises a pressure generating unit, wherein the pressure generating unit drives the needle valve of the needle valve runner to move so as to open or close the needle valve runner.
7. An injection mold according to any one of claims 2-5, wherein: the flow channel is an open flow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321369774.2U CN219768995U (en) | 2023-05-31 | 2023-05-31 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321369774.2U CN219768995U (en) | 2023-05-31 | 2023-05-31 | Injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219768995U true CN219768995U (en) | 2023-09-29 |
Family
ID=88108415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321369774.2U Active CN219768995U (en) | 2023-05-31 | 2023-05-31 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219768995U (en) |
-
2023
- 2023-05-31 CN CN202321369774.2U patent/CN219768995U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |