CN118269317B - High-pressure injection mold for complex curved surface - Google Patents
High-pressure injection mold for complex curved surface Download PDFInfo
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- CN118269317B CN118269317B CN202410542179.7A CN202410542179A CN118269317B CN 118269317 B CN118269317 B CN 118269317B CN 202410542179 A CN202410542179 A CN 202410542179A CN 118269317 B CN118269317 B CN 118269317B
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- 238000002347 injection Methods 0.000 title claims abstract description 58
- 239000007924 injection Substances 0.000 title claims abstract description 58
- 238000001746 injection moulding Methods 0.000 claims abstract description 82
- 238000001816 cooling Methods 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000000112 cooling gas Substances 0.000 claims abstract description 8
- 239000004033 plastic Substances 0.000 claims description 55
- 229920003023 plastic Polymers 0.000 claims description 55
- 239000012530 fluid Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 16
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7337—Heating or cooling of the mould using gas or steam
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a complex curved surface high-pressure injection mold, which relates to the technical field of high-pressure injection molding, wherein the device is provided with a mold plate with concave and convex mold forming surfaces and concave and convex mold temperature control surfaces which are the same in shape, and a temperature control cavity and a forming cavity are respectively arranged at two sides of the mold plate; the air inlet channel and the air outlet channel are connected with the temperature control cavity, and superheated steam or low-temperature cooling gas is circularly introduced to heat or cool the temperature control cavity; the thickness of the template of the female die is larger than that of the template of the male die; curved surfaces of the female die forming surface and the male die forming surface the position with severe variation is provided with an independent cooling cavity; the cooling cavity is enclosed in the temperature control cavity and communicated with the air inlet nozzle; the male die cover plate is connected to the microwave oscillating disc in a superposition manner; the injection nozzle high-temperature liquid pressurizing pump is communicated; the temperature control cavity is uniformly heated or cooled along with the forming cavity, the cooling cavity is rapidly cooled to form a connecting point and the pressurization of the high-temperature liquid pressurizing pump, so that the fluidity of high-density materials and the uniform distribution of forming internal stress can be improved, and the problems of the reduction of the forming quality and the product yield of injection molded parts are solved.
Description
Technical Field
The invention relates to the technical field of high-pressure injection molding, in particular to a complex curved surface high-pressure injection mold.
Background
The injection molding technique can be divided into a plurality of modes such as heating plastic raw materials and injecting the plastic raw materials into a mold for cooling molding, or adding the plastic raw materials into the mold, heating the mold, selecting the mold plastic, and cooling the mold plastic after the mold cavity is fully coated. Due to the development of the automobile industry, the appearance, the interior trim, the lamp housing assembly and the like of the automobile are matched with an injection molding machine when the parts are produced in batches, so that batch injection molding production is realized; however, the more complex the shape of these parts, the more curved surfaces are in shape design, which makes the injection mold and injection machine for producing such parts with many curved surfaces have process challenges; because of the complex curved surface parts, the product is mostly applied to the appearance, and is required to have a complex curved surface structure, high surface smoothness and general mechanical properties.
The part is provided with a very complex curved surface, a corresponding mold cavity of the mold also has a very complex forming cavity, the complex forming cavity has high requirements on the injection molding process, otherwise, the injection molded part has injection molding problems such as shrinkage cavity, shrinkage, unsaturated mold, burrs, weld marks, silver wires, scorching, buckling deformation, cracking/cracking, size out-of-tolerance and the like; to avoid these problems, it is necessary to control the temperature, pressure, speed and cooling, affecting the flow direction, orientation, adhesion and molecular/fiber connection of the plastic in the mold cavity, and thus controlling the process quality, the quality of the formed part.
In the prior art, when injection molding has a complex curved surface, a mold is usually manufactured to have a temperature control function, and the quality of a molded part is controlled from the control temperature. The plastic part is heated before injection molding and is rapidly cooled after injection molding, so that the plastic liquid fluidity of the plastic part during forming is reduced, and the problem caused by forming internal stress is solved. A machining method of drilling is usually used, a heating hole is drilled on a male die or a female die of a die, and then a heating rod is inserted into the heating hole, so that the die preheating function is realized; the rapid cooling is usually realized by connecting a stronger rapid cooling system, so that the uniform and rapid cooling of the temperature release is ensured; the temperature is controlled before and after injection molding, so that the heat of the mold can be obtained and the heat can be emitted uniformly, and high-quality injection molded parts can be obtained.
For the existing automobile appearance parts, besides better ornamental value of the local complex curved surface shape, the appearance parts applied to the outside of the cabin are required to have good mechanical properties, so that the automobile is provided with the properties of cushioning, buffering or deformation resistance; it is desirable to use high density materials in the manufacture of such parts. In injection molding production, most of injection molding materials are common materials, when the high-density materials are encountered, the high-density materials mean heavier materials, the fluidity in a mold cavity of a mold is poorer than that of the common materials, if the common injection molding method and the common injection mold are still used, the injection molding materials cannot be well molded in a molding cavity, so that the reject ratio of products is greatly improved, the quality of injection molded parts is also reduced, and the injection molding effect is not ideal.
Therefore, when the high-density material is used for injection molding to manufacture the complex curved surface part, the control can be performed from the two directions of injection molding temperature and injection molding pressure.
In summary, the present inventors have found that at least the following technical problems exist in the prior art:
the existing complex curved surface injection mold has the problems of reduced molding quality and reduced product yield of injection molded parts when high-density materials are used for injection molding.
Disclosure of Invention
The invention aims to provide a complex curved surface high-pressure injection mold, which solves the problems of reduced molding quality and reduced product yield of injection molded parts when the existing complex curved surface injection mold is used for injection molding by using high-density materials.
The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to solve the technical problems, the invention provides the following technical scheme:
The invention provides a complex curved surface high-pressure injection mold which comprises a female mold, a female mold cover plate, a male mold cover plate, a microwave oscillating disc, an injection nozzle and a high-temperature liquid pressurizing pump, wherein the female mold cover plate is arranged on the female mold; the die comprises a die plate, a die forming surface, a die temperature control surface, a die plate and a die, wherein the opposite two surfaces of the die plate of the die are respectively attached with the die forming surface and the die temperature control surface, and the die forming surface and the die temperature control surface are the same; the opposite sides of the template of the male die are respectively attached with a male die forming surface and a male die temperature control surface, and the male die forming surface and the male die temperature control surface are the same; the female die cover plate is detachably connected with the back surface of the female die to cover the female die temperature control surface, and the male die cover plate is detachably connected with the back surface of the male die to cover the male die temperature control surface to form respective temperature control cavities; the two opposite ends of the temperature control cavity are provided with an air inlet channel and an air outlet channel, and the air inlet channel and the air outlet channel circularly pass through superheated steam or low-temperature cooling gas for heating or cooling the temperature control cavity; the female die and the male die are clamped to form a forming cavity, and the forming cavity comprises a female die forming surface and a male die forming surface; the thickness of the template of the female die is larger than that of the template of the male die; the cooling cavity which is close to the female die forming surface or the male die forming surface from the temperature control cavity is arranged at the position of the female die forming surface and the male die forming surface with severe curved surface change; the female die cover plate and the male die cover plate are respectively provided with an air inlet nozzle, and the cooling cavity is enclosed in the temperature control cavity and is communicated with the air inlet nozzles; the male die cover plate is connected to the microwave oscillation disc in a superposition manner; one end of the injection molding nozzle penetrates through the female die cover plate to be communicated with an injection molding channel of the female die, and the other end of the injection molding nozzle is communicated with the high-temperature liquid pressurizing pump.
In one embodiment, the microwave oscillating disc vibrates the plastic fluid in the forming cavity to remove bubbles wrapped by the plastic fluid in the forming cavity.
In one embodiment, the high-temperature liquid pressurizing pump is a double-screw fluid pressurizing pump and is used for pressurizing and outputting plastic fluid.
In one embodiment, the air inlet channel and the air outlet channel are connected with three-way connectors; one interface of the three-way joint of the air inlet channel is a hot flow inlet, and the other interface is a cold flow inlet; one interface of the three-way joint of the air outlet channel is a hot flow outlet, and the other interface is a cold flow outlet; the air inlet nozzle is provided with an air inlet pipe and an air outlet pipe, and the air inlet pipe and the air outlet pipe are used for circularly exchanging cold flow gas which is introduced into the cooling cavity.
In one embodiment, a mold cavity temperature sensor is arranged in the forming cavity, and the mold cavity temperature sensor is arranged on one side of the female mold or the male mold and is used for detecting the temperature in the forming cavity; the temperature control cavity on one side of the female die and the temperature control cavity on one side of the male die are respectively provided with a temperature control sensor for detecting the temperature in the temperature control cavity.
In one embodiment, a pressure sensor is provided in the injection channel of the female die for detecting the pressure of the plastic fluid flowing into the forming cavity.
In one embodiment, a pressure sensor is arranged in the forming cavity, and the pressure sensor is arranged on one side of the female die or the male die and is used for detecting the pressure of plastic fluid flowing into the forming cavity.
In one embodiment, a high-temperature-resistant sealing strip is embedded in the periphery of one side of the male die, and moves along with the male die; the sealing strip is connected with an exhaust pipe; the sealing strip is used for surrounding the die closing boundary line of the female die and the male die during die closing; the sealing strip surrounds the male die and the outer wall of the female die to form an air cavity, and the exhaust pipe is communicated with the air cavity.
The invention also provides automatic control equipment, which comprises an injection molding machine, a heat flow generator, a water inlet device, a refrigerator, an air extractor and an industrial personal computer; a plastic fluid discharge port of the injection molding machine is communicated with a high-temperature liquid pressurizing pump; the heat flow inlet is communicated with the air outlet of the heat flow generator; the heat flow outlet is communicated with the heat recovery unit of the heat flow generator and is used for heat recovery and utilization; the water inlet of the heat flow generator is communicated with the water outlet of the water inlet device; the cold flow inlet and the air inlet pipe are communicated with the air outlet of the refrigerator; the cold flow outlet and the air outlet pipe are communicated with a cold flow recovery unit of the refrigerator and are used for recovering and utilizing cold flow; the air inlet of the air extractor is communicated with the exhaust pipe and is used for extracting air overflowed from the forming cavity; the industrial personal computer is electrically connected with the air extractor, the injection molding machine, the heat flow generator, the refrigerator, the pressure sensor, the mold cavity temperature sensor, the temperature control sensor and the microwave oscillating disc; the high-temperature liquid pressurizing pump is electrically connected with the injection molding machine and used for controlling the pressurizing feeding of the high-temperature liquid pressurizing pump.
In one embodiment, the heat flow generator is an electrothermal steam generator, and outputs superheated steam to form heat flow.
The beneficial effects of the invention are as follows:
the complex curved surface high-pressure injection mold is provided with a die plate with concave and convex die forming surfaces and concave and convex die temperature control surfaces which are the same in shape, and a temperature control cavity and a forming cavity are respectively arranged on two sides of the complex curved surface high-pressure injection mold.
(1) The air inlet channel and the air outlet channel are connected with the temperature control cavity, and superheated steam or low-temperature cooling gas is circularly introduced to heat or cool the temperature control cavity; the independent cooling cavities are arranged at the positions of the concave die forming surface and the convex die forming surface, which have severe curved surface changes; the structure that the independent cooling cavity is abutted to the female die forming surface or the male die forming surface from the temperature control cavity is utilized, firstly, cooling air flow is introduced to rapidly cool the position with severe curved surface change in the injection molding piece, vertical connecting points or connecting columns in the thickness direction are formed in the microstructure, then plastic fluid around the vertical connecting points is continuously cooled in the temperature control cavity through the cooling air flow, the plastic fluid is uniformly cooled and overlapped around the vertical connecting points, and a mutually-adhered transverse laminated structure similar to the laminated structure of carbon fiber plates is formed; the injection molding part with the complex curved surface reduces the forming internal stress at the position with severe change of the curved surface in the forming process, the integral lamination adhesion plastic particles of the injection molding part are orderly arranged, the injection molding part with the complex curved surface has higher mechanical property after being formed, and the injection molding part has tighter molecular structure and stronger toughness due to the orderly arrangement of the plastic particles; thereby reducing the cracking probability of the injection molding piece and improving the yield of the injection molding piece with the complex curved surface.
(2) The surface of the injection molding piece, which is positioned on the female die, is usually an appearance surface with high smoothness and fine structure, and the surface of the injection molding piece, which is positioned on the male die, is an inner surface with low precision; the thickness of the template of the female die is larger than that of the template of the male die, so that the cooling speed of the female die side is slower than that of the male die side when the female die is cooled through the temperature control cavity, the forming structure of the injection molding piece positioned on the female die side is finer, the internal stress is smaller, and the structural strength is higher; the forming structure of the injection molding piece positioned on the male die side is rough, and the structural support is better; the whole strength and the forming precision of the injection molding piece are ensured while the injection molding piece obtains a faster cooling speed.
(3) The male die cover plate is connected to the microwave oscillation disc in a superposition mode, so that after plastic fluid enters the forming cavity, the plastic fluid can be fully injected into complex parts of the structure, the fluidity of high-density materials is improved, air bubbles in the plastic fluid can be vibrated out, and cracking of an injection molding part due to the air bubbles and reduction of structural strength are reduced.
(4) The high-temperature liquid pressurizing pump of the injection nozzle is communicated, so that the pressure of the plastic fluid entering the forming cavity can be improved, the fluidity of the high-density material is further improved, and the forming cavity is better filled with the plastic fluid.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional structure of a complex curved surface high-pressure injection mold of the present invention;
FIG. 2 is a schematic diagram of a closed cross-section structure of a complex curved surface high-pressure injection mold of the invention;
FIG. 3 is a control schematic of the automatic control apparatus of the present invention;
Fig. 4 is a schematic view of a microscopic cross-sectional structure of a position of a complex curved surface in which a curved surface is severely changed in an injection molded article injection molded by the complex curved surface high-pressure injection mold of the present invention.
Wherein, the reference numerals are as follows:
1. a female die; 11. forming a female die forming surface; 12. a temperature control surface of the female die; 13. a female die cover plate;
2. A male die; 21. a male molding surface; 22. a male die temperature control surface; 23. a male die cover plate;
3. A microwave oscillating disc;
4. a high-temperature liquid pressurizing pump; 41. an injection nozzle;
5. a temperature control cavity; 51. an air inlet channel; 511. a heat flow inlet; 512. a cold flow inlet; 52. an air outlet channel; 521. a heat flow outlet; 522. a cold flow outlet;
6. A forming cavity;
7. a cooling chamber; 71. an air inlet nozzle; 711. an air inlet pipe; 712. an air outlet pipe;
8. A sealing strip; 81. an exhaust pipe;
91. A junction point; 92. and (5) laminating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
The embodiment provides a complex curved surface high-pressure injection mold so as to effectively solve the problems of reduced molding quality and reduced product yield of injection molded parts when the existing complex curved surface injection mold is used for injection molding by using high-density materials.
Hereinafter, embodiments will be described with reference to the drawings. The whole contents of the constitution shown in the following examples are not limited to the solution of the invention described in the claims.
A first embodiment of a complex curved surface high-pressure injection mold is shown in fig. 1 and 2, and comprises a female die 1, a female die cover plate 13, a male die 2, a male die cover plate 23, a microwave oscillating disc 3, an injection nozzle 41 and a high-temperature liquid pressurizing pump 4; the opposite two surfaces of the template of the female die 1 are respectively attached with a female die forming surface 11 and a female die temperature control surface 12, and the female die forming surface 11 and the female die temperature control surface 12 have the same shape; the two opposite sides of the template of the male die 2 are respectively attached with a male die forming surface 21 and a male die temperature control surface 22, and the male die forming surface 21 and the male die temperature control surface 22 have the same shape; the die cover plate 13 is detachably connected with the back surface of the die 1 to cover the die temperature control surface 12, and the die cover plate 23 is detachably connected with the back surface of the die 2 to cover the die temperature control surface 22 to form respective temperature control cavities 5; the opposite ends of the temperature control cavity 5 are provided with an air inlet channel 51 and an air outlet channel 52, and the air inlet channel 51 and the air outlet channel 52 are circularly used for introducing superheated steam or low-temperature cooling gas for heating or cooling the temperature control cavity 5; the female die 1 and the male die 2 are clamped to form a forming cavity 6, and the forming cavity 6 comprises a female die forming surface 11 and a male die forming surface 21; the thickness of the template of the female die 1 is larger than that of the template of the male die 2; a cooling cavity 7 which is abutted against the female die forming surface 11 or the male die forming surface 21 from the temperature control cavity 5 is arranged at the position of the female die forming surface 11 and the male die forming surface 21 with severe curved surface change; the female die cover plate 13 and the male die cover plate 23 are respectively provided with an air inlet nozzle 71, and the cooling cavity 7 is enclosed in the temperature control cavity 5 and is communicated with the air inlet nozzles 71; the male die cover plate 23 is connected to the microwave oscillation disc 3 in a superposition manner; one end of the injection nozzle 41 passes through the die cover plate 13 to be communicated with an injection channel of the die 1, and the other end of the injection nozzle 41 is communicated with the high-temperature liquid pressurizing pump 4.
Because the complex curved surface high-pressure injection mold is provided with templates with the same shape of the concave and convex mold forming surface 21 and the concave and convex mold temperature control surface 22, the two sides are respectively provided with the temperature control cavity 5 and the forming cavity 6.
(1) The temperature control cavity 5 is connected through the air inlet channel 51 and the air outlet channel 52, and superheated steam or low-temperature cooling gas is circularly introduced for heating or cooling the temperature control cavity 5; and an independent cooling cavity 7 is arranged at the position of the concave die forming surface 11 and the convex die forming surface 21, wherein the curved surface of the position is changed severely; by utilizing the structure of the independent cooling cavity 7, which is close to the female die forming surface 11 or the male die forming surface 21 from the temperature control cavity 5, firstly, cooling the position with severe curved surface change in the injection molding part by introducing cooling air flow, referring to fig. 4, forming a vertical connecting point 91 or connecting column in the thickness direction in the microstructure, subsequently continuously cooling plastic fluid around the vertical connecting point 91 in the temperature control cavity 5 by using the cooling air flow, uniformly cooling and overlapping the plastic fluid around the vertical connecting point 91 to form a mutually-adhered transverse laminated structure similar to the laminated structure of a carbon fiber plate; the injection molding part with the complex curved surface reduces the forming internal stress at the position with severe change of the curved surface in the forming process, the integral lamination adhesion plastic particles of the injection molding part are orderly arranged, the injection molding part with the complex curved surface has higher mechanical property after being formed, and the injection molding part has tighter molecular structure and stronger toughness due to the orderly arrangement of the plastic particles; thereby reducing the cracking probability of the injection molding piece and improving the yield of the injection molding piece with the complex curved surface.
(2) The surface of the injection molding part, which is positioned on the female die 1, is usually an appearance surface with high smoothness and fine structure, and the surface of the injection molding part, which is positioned on the male die 2, is an inner surface with low precision; thanks to the fact that the thickness of the template of the female die 1 is larger than that of the template of the male die 2, when the female die 1 is cooled through the temperature control cavity 5, the cooling speed of the female die 1 side is slower than that of the male die 2 side, the forming structure of the injection molding piece on the female die 1 side is finer, the internal stress is smaller, and the structural strength is higher; the injection molding part is positioned on the side of the male die 2, so that the forming structure is rough, and the structural support is better; the whole strength and the forming precision of the injection molding piece are ensured while the injection molding piece obtains a faster cooling speed.
(3) The male die cover plate 23 is connected to the microwave oscillating plate 3 in a superposition manner, so that after plastic fluid enters the forming cavity 6, the fluidity of high-density materials can be improved at the complex part of the fully injected structure, and meanwhile, bubbles in the plastic fluid can be vibrated out, and the cracking of an injection molding part due to the bubbles and the reduction of structural strength are reduced.
(4) Thanks to the communication of the high-temperature liquid pressurizing pump 4 of the injection nozzle 41, the pressure of the plastic fluid entering the forming cavity 6 can be increased, the fluidity of the high-density material is further improved, and the forming cavity 6 is better filled with the plastic fluid.
As an alternative to one of these embodiments,
Regarding the function of the microwave oscillating disc 3 applied to the complex curved surface high-pressure injection mold, as shown in fig. 1 and 2, the microwave oscillating disc 3 vibrates the plastic fluid in the forming cavity 6 to remove the bubbles wrapped by the plastic fluid in the forming cavity 6.
Regarding the specific type of the above-described high-temperature liquid pressurizing pump 4, this embodiment is shown in fig. 1 and 2, and the high-temperature liquid pressurizing pump 4 is a twin-screw fluid pressurizing pump for pressurizing output of plastic fluid.
Regarding the air inlet and outlet structure of the temperature control chamber 5 and the cooling chamber 7, in this embodiment, as shown in fig. 1 and 2, three-way connectors are connected to the air inlet channel 51 and the air outlet channel 52; one interface of the three-way joint of the air inlet channel 51 is a hot flow inlet 511, and the other interface is a cold flow inlet 512; one interface of the three-way joint of the air outlet channel 52 is a hot flow outlet 521, and the other interface is a cold flow outlet 522; the air inlet nozzle 71 is provided with an air inlet pipe 711 and an air outlet pipe 712, and the air inlet pipe 711 and the air outlet pipe 712 are used for circularly exchanging cold flow gas introduced into the cooling cavity 7.
Regarding the temperature control of the temperature control chamber 5, the cooling chamber 7 and the forming chamber 6, as shown in fig. 3, a cavity temperature sensor is provided in the forming chamber 6, and the cavity temperature sensor is provided at one side of the female die 1 or the male die 2 for detecting the temperature in the forming chamber 6; the temperature control cavity 5 on one side of the female die 1 and the temperature control cavity 5 on one side of the male die 2 are respectively provided with a temperature control sensor for detecting the temperature in the temperature control cavity 5.
When the temperature control device is applied, the temperature information of the temperature control cavity 5 and the forming cavity 6 is fed back to the industrial personal computer by using the set temperature sensor, and the industrial personal computer controls the working states of the heat flow generator and the refrigerator, so that the temperatures of the temperature control cavity 5, the cooling cavity 7 and the forming cavity 6 are controlled, and the heating or cooling of the forming cavity 6 is controlled.
Regarding the above-described injection pressure control in the forming chamber 6, in this embodiment, as shown in fig. 3, a pressure sensor is provided in the injection passage of the female die 1 for detecting the pressure of the plastic fluid flowing into the forming chamber 6.
When the pressure sensor is used, the pressure information in the forming cavity 6 is fed back to the industrial personal computer, and the pressure of the high-temperature liquid pressure pump 4 is controlled by the industrial personal computer, so that the pressure in the forming cavity 6 is controlled.
A second embodiment of a complex curved high-pressure injection mold is shown in fig. 3, which differs from the first embodiment in that a pressure sensor is provided in the forming chamber 6, the pressure sensor being provided on one side of the female mold 1 or the male mold 2 for detecting the pressure of the plastic fluid flowing into the forming chamber 6.
When the pressure sensor is used, the pressure information in the forming cavity 6 is fed back to the industrial personal computer, and the pressure of the high-temperature liquid pressure pump 4 is controlled by the industrial personal computer, so that the pressure in the forming cavity 6 is controlled.
A third embodiment of the complex curved surface high pressure injection mold is shown in fig. 2, which is different from the first embodiment in that a high temperature resistant sealing strip 8 is embedded at the periphery of one side of the male mold 2, and the sealing strip 8 moves along with the male mold 2; the sealing strip 8 is connected with an exhaust pipe 81; the sealing strip 8 is used for surrounding the die closing boundary line of the female die 1 and the male die 2 during die closing; the sealing strip 8 surrounds the male die 2 the outer wall of the female die 1 forms an air cavity, the exhaust pipe 81 opens the air chamber.
When the plastic fluid injection molding device is applied, the pressure sensor is used for detecting, the industrial personal computer controls the air extractor to start discharging part of air in the molding cavity 6 after the die is closed, and when the plastic fluid is injected into the molding cavity 6, the air is sucked out, the internal air bubbles are broken, the high-temperature liquid pressurizing pump 4 is matched with the control, and the plastic fluid is filled in the molding cavity 6, so that the high-pressure injection molding is realized.
One embodiment of an automatic control device matched with the complex curved surface high-pressure injection mold is shown in fig. 1 to 3, and comprises an injection molding machine, a heat flow generator, a water inlet device, a refrigerator, an air extractor and an industrial personal computer; a plastic fluid discharge port of the injection molding machine is communicated with a high-temperature liquid pressurizing pump 4; the heat flow inlet 511 is communicated with the air outlet of the heat flow generator; the heat flow outlet 521 is communicated with a heat recovery unit of the heat flow generator and is used for heat recovery and utilization; the water inlet of the heat flow generator is communicated with the water outlet of the water inlet device; the cold flow inlet 512 and the air inlet pipe 711 are communicated with the air outlet of the refrigerator; the cold flow outlet 522 and the air outlet pipe 712 are communicated with a cold flow recovery unit of the refrigerator for cold flow recovery and utilization; the air inlet of the air extractor is communicated with the exhaust pipe 81 and is used for extracting the air overflowed from the forming cavity 6; the industrial personal computer is electrically connected with the air extractor, the injection molding machine, the heat flow generator, the refrigerator, the pressure sensor, the mold cavity temperature sensor, the temperature control sensor and the microwave oscillating disc 3; the high-temperature liquid pressurizing pump 4 is electrically connected with the injection molding machine and used for controlling the high-temperature liquid pressurizing pump 4 to pressurize and feed.
As an alternative embodiment, the heat flow generator is an electrothermal steam generator, and outputs superheated steam to form heat flow.
In the application, the superheated steam should be dry steam of 100 degrees or more.
The process flow of applying the complex curved surface high-pressure injection mold, as shown in fig. 3, comprises the following steps:
S1: the industrial personal computer controls the die 1 and the male die 2 of the complex curved surface high-pressure injection mold arranged on the injection molding machine to be matched; monitoring the temperature of the temperature control cavity 5 and the forming cavity 6, and monitoring the pressure of the forming cavity 6;
S2: the industrial personal computer controls and starts the heat flow generator, and the forming cavity 6 is preheated by entering superheated steam into the temperature control cavity 5; in combination with temperature monitoring, the temperature in the forming cavity 6 reaches or approaches the injection temperature of the high-density plastic fluid;
S3: the industrial personal computer controls and starts the air extractor to extract other heating expansion materials in the forming cavity 6 and stabilize the pressure in the forming cavity 6;
S4: the industrial personal computer controls the injection molding machine and the high-temperature liquid pressurizing pump 4, starts the injection molding machine to output plastic fluid, and pressurizes and injects the plastic fluid into the forming cavity 6 through the high-temperature liquid pressurizing pump 4; starting a microwave oscillating disc 3 and an air extractor, wherein the microwave oscillating disc 3 oscillates out air bubbles in plastic fluid, the air extractor extracts redundant air in a forming cavity 6, monitors the pressure in the forming cavity 6, and controls the pressurizing pressure of a high-temperature liquid pressurizing pump 4 and the negative pressure of the air extractor;
S5: after the injection of the plastic fluid is completed, the industrial personal computer controls the injection molding machine to stop outputting, controls the high-temperature liquid pressurizing pump 4 to keep the forming cavity 6 at high and stable pressure, and the air extractor and the microwave oscillating disc 3 stop working; so that the plastic fluid in the forming chamber 6 can be cooled and formed under high pressure;
s6: the industrial personal computer controls the refrigerator to start, and the heat flow generator stops; the refrigerator outputs a cryogenically cooled gas.
S7: firstly, low-temperature cooling gas is introduced into the cooling cavity 7, and the position with severe curved surface change in the injection molding piece is cooled, so that a connecting point 91 is formed in the injection molding piece at first; and then low-temperature cooling gas is introduced into the temperature control cavity 5 to cool the temperature control cavity 5, so that the whole injection molding part in the forming cavity 6 is uniformly cooled.
In application, as shown in fig. 4, cooling is performed twice on the female die 1 and the male die 2, and the injection molding part is positioned at the position of the cooling cavity 7, so that a connecting point 91 or a connecting column with a laminated shape and formed inwards on two sides is formed, forming internal stress at a position with a severe curved surface change in the molding part can be reduced, and a support is formed for a surrounding structure formed subsequently; the subsequent cooling that lasts is carried out temperature control chamber 5, can evenly cool off shaping chamber 6, makes the plastics in the shaping chamber 6 form stromatolite 92 and with the tie point 91 or the spliced pole adhesion around with range upon range of form plastic layer adhesion about, can improve the overall structure intensity and the toughness of injection molding for the injection molding that possesses complicated curved surface structure is not fragile, improves the recoverable deformation performance of injection molding.
The technical features of the above embodiments may be arbitrarily combined, and for brevity, all of the possible combinations of the technical features of the above embodiments are not described.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A complex curved surface high-pressure injection mold is characterized in that,
The device comprises a female die, a female die cover plate, a male die cover plate, a microwave oscillating disc, an injection nozzle and a high-temperature liquid pressurizing pump;
The die comprises a die plate, a die forming surface, a die temperature control surface, a die plate and a die, wherein the opposite two surfaces of the die plate of the die are respectively attached with the die forming surface and the die temperature control surface, and the die forming surface and the die temperature control surface are the same; the opposite sides of the template of the male die are respectively attached with a male die forming surface and a male die temperature control surface, and the male die forming surface and the male die temperature control surface are the same;
The female die cover plate is detachably connected with the back surface of the female die to cover the female die temperature control surface, and the male die cover plate is detachably connected with the back surface of the male die to cover the male die temperature control surface to form respective temperature control cavities; the two opposite ends of the temperature control cavity are provided with an air inlet channel and an air outlet channel, and the air inlet channel and the air outlet channel circularly pass through superheated steam or low-temperature cooling gas for heating or cooling the temperature control cavity;
The female die and the male die are clamped to form a forming cavity, and the forming cavity comprises a female die forming surface and a male die forming surface; the thickness of the template of the female die is larger than that of the template of the male die;
The cooling cavity which is close to the female die forming surface or the male die forming surface from the temperature control cavity is arranged at the position of the female die forming surface and the male die forming surface with severe curved surface change;
The female die cover plate and the male die cover plate are respectively provided with an air inlet nozzle, and the cooling cavity is enclosed in the temperature control cavity and is communicated with the air inlet nozzles;
The male die cover plate is connected to the microwave oscillation disc in a superposition manner; one end of the injection molding nozzle penetrates through the female die cover plate to be communicated with an injection molding channel of the female die, and the other end of the injection molding nozzle is communicated with the high-temperature liquid pressurizing pump;
a die cavity temperature sensor is arranged in the forming cavity, and the die cavity temperature sensor is arranged on one side of the female die or the male die and is used for detecting the temperature in the forming cavity;
the temperature control cavity on one side of the female die and the temperature control cavity on one side of the male die are respectively provided with a temperature control sensor for detecting the temperature in the temperature control cavity;
And feeding back temperature information of the temperature control cavity and the forming cavity to the industrial personal computer by using the set temperature sensor, wherein the industrial personal computer controls the working states of the heat flow generator and the refrigerator, thereby controlling the temperatures of the temperature control cavity, the cooling cavity and the forming cavity, and further controlling the heating or cooling of the forming cavity.
2. The complex curved surface high pressure injection mold according to claim 1, wherein,
And the microwave oscillating disc vibrates the plastic fluid in the forming cavity to remove bubbles wrapped by the plastic fluid in the forming cavity.
3. The complex curved surface high pressure injection mold according to claim 2, wherein,
The high-temperature liquid pressurizing pump is a double-screw fluid pressurizing pump and is used for pressurizing and outputting plastic fluid.
4. The complex curved surface high pressure injection mold according to claim 3, wherein,
Three-way connectors are connected to the air inlet channel and the air outlet channel; one interface of the three-way joint of the air inlet channel is a hot flow inlet, and the other interface is a cold flow inlet; one interface of the three-way joint of the air outlet channel is a hot flow outlet, and the other interface is a cold flow outlet;
the air inlet nozzle is provided with an air inlet pipe and an air outlet pipe, and the air inlet pipe and the air outlet pipe are used for circularly exchanging cold flow gas which is introduced into the cooling cavity.
5. The complex curved surface high pressure injection mold according to claim 4, wherein,
And a pressure sensor is arranged in the injection molding channel of the female die and used for detecting the pressure of plastic fluid flowing into the forming cavity.
6. The complex curved surface high pressure injection mold according to claim 4, wherein,
The forming cavity is internally provided with a pressure sensor which is arranged on one side of the female die or the male die and used for detecting the pressure of plastic fluid flowing into the forming cavity.
7. The complex curved surface high pressure injection mold according to claim 6, wherein,
A high-temperature-resistant sealing strip is embedded on the periphery of one side of the male die, and moves along with the male die;
the sealing strip is connected with an exhaust pipe;
the sealing strip is used for surrounding the die closing boundary line of the female die and the male die during die closing;
The sealing strip surrounds the male die and the outer wall of the female die to form an air cavity, and the exhaust pipe is communicated with the air cavity.
8. An automatic control apparatus for a complex curved surface high pressure injection mold according to any one of claims 5 to 7, characterized in that,
Comprises an injection molding machine, a heat flow generator, a water inlet device, a refrigerator, an air pump and an industrial personal computer;
A plastic fluid discharge port of the injection molding machine is communicated with a high-temperature liquid pressurizing pump;
the heat flow inlet is communicated with the air outlet of the heat flow generator; the heat flow outlet is communicated with the heat recovery unit of the heat flow generator and is used for heat recovery and utilization; the water inlet of the heat flow generator is communicated with the water outlet of the water inlet device;
the cold flow inlet and the air inlet pipe are communicated with the air outlet of the refrigerator; the cold flow outlet and the air outlet pipe are communicated with a cold flow recovery unit of the refrigerator and are used for recovering and utilizing cold flow;
the air inlet of the air extractor is communicated with the exhaust pipe and is used for extracting air overflowed from the forming cavity;
The industrial personal computer is electrically connected with the air extractor, the injection molding machine, the heat flow generator, the refrigerator, the pressure sensor, the mold cavity temperature sensor, the temperature control sensor and the microwave oscillating disc;
The high-temperature liquid pressurizing pump is electrically connected with the injection molding machine and used for controlling the pressurizing feeding of the high-temperature liquid pressurizing pump.
9. The automatic control device according to claim 8, wherein,
The heat flow generator is an electrothermal steam generator, and outputs superheated steam to form heat flow.
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