CN220499776U - Liquid silica gel injection mold with reverse glue port - Google Patents
Liquid silica gel injection mold with reverse glue port Download PDFInfo
- Publication number
- CN220499776U CN220499776U CN202320473664.4U CN202320473664U CN220499776U CN 220499776 U CN220499776 U CN 220499776U CN 202320473664 U CN202320473664 U CN 202320473664U CN 220499776 U CN220499776 U CN 220499776U
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- glue
- reflecting
- cavity
- port
- upper die
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- 239000003292 glue Substances 0.000 title claims abstract description 150
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000000741 silica gel Substances 0.000 title claims abstract description 52
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 52
- 239000007788 liquid Substances 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 14
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000000499 gel Substances 0.000 description 7
- 238000004513 sizing Methods 0.000 description 6
- 229920002379 silicone rubber Polymers 0.000 description 4
- 238000010073 coating (rubber) Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004944 Liquid Silicone Rubber Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The utility model relates to a liquid silica gel injection mold with a reverse glue port, which comprises a mold body and a mold body, wherein the mold body is provided with a reverse glue port: a glue reflecting port is arranged at a set distance between the top of the upper die and the glue inlet; a glue-reflecting port runner penetrating through the inside of the upper die is arranged at the glue-reflecting port along the bottom direction of the upper die, and the glue-reflecting port is communicated with the top of the cavity through the glue-reflecting port runner; the aperture of the glue reflecting opening is smaller than that of the glue inlet. The beneficial effects of the utility model are as follows: in the die cavity of the utility model, a glue reflecting port is arranged at a preferable position on an upper die; the glue inlet pressure of the glue inlet is balanced, the flow speed of the liquid silica gel is controlled, and the phenomenon of glue overflow caused by the fact that the liquid silica gel in the cavity breaks through the glue sealing position due to overlarge pressure is avoided; the glue-reflecting opening can also discharge the air in the containing cavity; the aperture of the glue reflecting opening is a preferred value smaller than the aperture of the glue inlet, so that air pressure difference exists between the bottom end of the glue reflecting opening flow channel and the bottom end of the glue reflecting opening, and the phenomenon of glue shortage of the liquid silica gel injection molding product caused by air trapping is avoided.
Description
Technical Field
The utility model relates to the technical field of liquid silica gel injection molding, in particular to a liquid silica gel injection mold with a reverse gel port.
Background
Silica gel is a high-activity adsorption material, has good elasticity and stability, stable chemical property and high and low temperature resistance, and is widely applied to the food and medical industries.
LSR is fully named as injection molding liquid silicone rubber, and vulcanizing equipment is selected as an injection molding machine; in the process flow of the injection molding machine, the manual procedure before molding the silica gel is replaced by a machine, the A/B gel can be molded in a few seconds after being mixed at a certain temperature, so that the manual procedures of batching, mixing, cutting, arranging and the like in the high-temperature gel process are omitted, and only one worker is required to take the product; the method has the advantages of saving labor, electricity and materials, along with simple flow, high product accuracy and high yield; in addition, products produced by the high-temperature glue have various application ways; therefore, LSR is the mainstream of development of silica gel (silicone rubber) at present. Silica gel (silicone rubber) is processed into products of different shapes, such as a silica gel nipple, a silica gel key, and the like.
As shown in fig. 1, the process of the rubber coating piece is to inject liquid silica gel into a plastic piece mold to form the rubber coating piece; however, in the process of forming the encapsulation piece by silica gel injection molding, phenomena such as air trapping, gel shortage, gel overflow and the like often occur in the product. And the products of the rubber coating parts are required to have no bad phenomena such as bubbles, lack of glue, no glue overflow and the like.
The disclosure number CN202399476U is a mold structure for preventing glue overflow, and the bottom of the material injection plate and the upper surface of the lower template are respectively provided with a convex plane high-elasticity soft cushion, so that the gap between a metal filter screen and the material plate and between the metal filter screen and the lower template is eliminated, and the filter screen is sealed before rubber injection; the problem that the massive rubber in the material injection plate overflows into the filter screen placed between the material injection plate and the lower template is only avoided, and the problem of glue overflow in the process of preparing a formed product by injecting liquid silica gel into a plastic mold is not solved.
The injection processing mould of a sealing ring with the publication number of CN208305647U is provided with a runner cavity with a special structure, and if the structure is arranged, a sizing material overflows from a runner with a convex structure and a concave structure, the sizing material must turn upwards and then at two right angles in the left (right) direction, and the distance between the runner cavity with the special structure and the sizing material overflow gap is increased by the runner cavity with the special structure, so that the defect of glue overflow of the runner is overcome; however, the patent does not solve the problem that the liquid silica gel overflows between the upper mold and the middle mold after filling the mold, and the problems of shortage of the gel and recovery of the liquid silica gel, and still has certain defects.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a liquid silica gel injection mold with a reverse glue port.
The liquid silica gel injection mold with the reverse glue port is characterized in that a cavity is formed in a lower mold, a plastic part mold with a matched shape is placed in the cavity, and the cavity clamps the plastic part mold in the lower mold; the lower die is provided with a guide post, the upper die is provided with a guide sleeve corresponding to the guide post in position, the guide sleeve is sleeved on the guide post, and the upper die is closely attached to the lower die; the outer edge of the contact surface of the upper die and the lower die is provided with a circle of sealing piece to form a sealing glue position; a cavity is formed among the upper die, the lower die, the cavity and the plastic part die; the edge of the top of the upper die is provided with a glue inlet, and the glue inlet penetrates through the upper die and is communicated with the top of the cavity through a glue inlet runner;
a glue reflecting port is arranged at a set distance between the top of the upper die and the glue inlet; a glue-reflecting port runner penetrating through the inside of the upper die is arranged at the glue-reflecting port along the bottom direction of the upper die, and the glue-reflecting port is communicated with the top of the cavity through the glue-reflecting port runner; the aperture of the glue reflecting opening is smaller than that of the glue inlet.
Preferably, the minimum aperture of the glue reflecting opening is phi 0.4mm, and the maximum aperture of the glue reflecting opening is less than or equal to half of the aperture of the glue inlet.
Preferably, the diameter of the glue inlet runner is the same as the aperture of the glue inlet, and the diameter of the glue return runner is the same as the aperture of the glue return; the glue-reversing opening is used for balancing the glue-feeding pressure of the glue-feeding opening; the glue reflecting port is also used for exhausting the air in the containing cavity.
Preferably, the glue reversing port is arranged at the top of the upper die and is axially symmetrical to the glue inlet.
Preferably, the position of the glue reflecting opening is a position range where the liquid silica gel is injected into the containing cavity from the glue inlet through the glue inlet runner until the containing cavity is filled up quickly, and the liquid silica gel extrudes air in the containing cavity to an air converging position at the bottom of the upper die.
The beneficial effects of the utility model are as follows:
in the die cavity of the utility model, a glue reflecting port is arranged at a preferable position on an upper die; the glue inlet pressure of the glue inlet is balanced, the flow speed of the liquid silica gel is controlled, and the phenomenon of glue overflow caused by the fact that the liquid silica gel in the cavity breaks through the glue sealing position due to overlarge pressure is avoided; the glue-reflecting opening can also discharge the air in the containing cavity; the aperture of the glue reflecting opening is a preferred value smaller than the aperture of the glue inlet, so that air pressure difference exists between the bottom end of the glue reflecting opening flow channel and the bottom end of the glue reflecting opening, and the phenomenon of glue shortage of the liquid silica gel injection molding product caused by air trapping is avoided. In conclusion, the utility model can solve the problems of air trapping, glue shortage, glue overflow and the like in the injection molding process of the liquid silica gel silicone rubber, and produce qualified products.
Drawings
FIG. 1 is a schematic view of a prior art overmold;
FIG. 2 is a schematic view of a liquid silicone injection mold prior to modification;
FIG. 3-1 is a schematic view of the glue inlet and the glue return opening of the present utility model;
FIG. 3-2 is a schematic view of section D-D of FIG. 3-1;
FIG. 4 is a side view in elevation of the present utility model during a silicone injection flow process;
fig. 5 is a top view of the present utility model during a silica gel injection flow process.
Reference numerals illustrate: the plastic part mold 1, liquid silica gel 2, a sealing part 3, a pouring gate 4, an upper mold 5, a lower mold 6, a glue inlet 7, a glue reflecting opening 8, a plastic part 9, a cavity 10, a glue reflecting opening runner 11 and a glue inlet runner 12.
Detailed Description
The utility model is further described below with reference to examples. The following examples are presented only to aid in the understanding of the utility model. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present utility model without departing from the principles of the utility model, and such modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
As an embodiment, as shown in fig. 3-1, 3-2, 4 and 5, a liquid silica gel injection mold with a reverse glue port is provided, a cavity 10 is arranged in a lower mold 6, a plastic mold 1 with a shape matching with that of the cavity 10 is placed in the cavity 10, and the cavity 10 clamps the plastic mold 1 in the lower mold 6; the lower die 6 is provided with a guide post, the upper die 5 is provided with a guide sleeve corresponding to the guide post in position, the guide sleeve is sleeved on the guide post, and the upper die 5 is placed close to the lower die 6; the outer edge of the contact surface of the upper die 5 and the lower die 6 is provided with a circle of sealing piece to form a sealing glue position 3; a cavity is formed among the upper die 5, the lower die 6, the cavity 10 and the plastic part die 1; the edge of the top of the upper die 5 is provided with a glue inlet 7, the glue inlet 7 penetrates through the upper die 5 and is communicated with the top of the cavity through a glue inlet runner 12, and the diameter of the glue inlet runner 12 is the same as the aperture of the glue inlet 7;
when liquid silica gel is injected into the containing cavity from the glue inlet 7 through the glue inlet runner 12 until the containing cavity is filled up quickly, the liquid silica gel extrudes air in the containing cavity, and a glue reflecting opening 8 is arranged in a position range where air at the bottom of the upper die 5 is converged, which is the final glue collecting position after the glue injection process is finished; a glue-reflecting port runner 11 penetrating through the inside of the upper die 5 is arranged at the glue-reflecting port 8 along the bottom direction of the upper die 5, and the glue-reflecting port 8 is communicated with the top of the cavity through the glue-reflecting port runner 11; the diameter of the glue-reflecting mouth flow channel 11 is the same as the aperture of the glue-reflecting mouth 8; the glue return opening 8 is used for balancing the glue inlet pressure of the glue inlet 7, controlling the flow velocity of the liquid silica gel, and avoiding glue overflow phenomenon caused by that the liquid silica gel in the cavity breaks the glue sealing position due to overlarge pressure; the glue reflecting port 8 is also used for discharging air in the containing cavity;
if the pore diameter of the glue reflecting port 8 is too small, the following is easy to cause: 1. the glue inlet pressure of the cavity 10 is difficult to release, the air in the cavity is difficult to discharge, and the improvement on the prior art is not obvious; 2. the liquid silica gel overflowed from the glue reversing port 8 is too little, and waste glue is difficult to take out in the later stage, so that the production efficiency is reduced;
if the pore diameter of the glue reflecting port 8 is too large, the following is easy to cause: 1. the glue feeding pressure of the cavity 10 is released at extremely high speed, the glue injection flow speed of the liquid silica gel is reduced, the glue in the cavity 10 is not filled fully, and the injection molded silica gel product is easy to be lacked and is unqualified; 2. too much liquid silica gel overflows from the reverse glue port 8, so that waste of liquid silica gel raw materials is caused;
to sum up, in the embodiment, the minimum aperture of the glue reflecting opening 8 is Φ0.4mm, and the maximum aperture of the glue reflecting opening 8 is less than or equal to half of the aperture of the glue inlet 7, so that an air pressure difference exists between the bottom end of the glue reflecting opening runner and the bottom end of the glue reflecting opening, and the phenomenon of glue shortage of the liquid silicone injection molding product caused by air trapping is avoided.
When the liquid silica gel injection mold with the reverse gel port of the embodiment is used for liquid silica gel injection:
after the liquid silica gel injection mould with the glue reflecting opening is closed, the injection machine starts to inject glue into the cavity 10 through the glue inlet 7, and parameters such as injection quantity, closing force, injection speed and the like of the injection machine are set; the cavity 10 is filled with silicone.
When the cavity 10 starts to be injected with glue, the glue inlet 7 is injected with the silica gel to fill the cavity 10; at this time, the silica gel is pressed out of the original air in the cavity 10 under the injection pressure, and finally fills the cavity 10.
When the cavity 10 is filled, the liquid silica gel extrudes air in the cavity to the position of the glue reflecting opening 8 at the air converging position at the bottom of the upper die 5; the injection machine continues to inject the glue, and all air in the cavity 10 is discharged out of the cavity 10 under the pressure release effect of the glue reversing port 8.
At the end of the injection process, the glue return port 8 functions as a "pressure relief". At the moment, the pressure release is carried out to discharge the air and the redundant sizing material of the cavity out of the cavity, so that the problem of air trapping in the cavity is reasonably solved.
Otherwise, if the pressure relief effect of the glue reflecting opening is not achieved, air in the cavity cannot be discharged, glue stock and the air in the cavity can form a vortex shape under the action of injection pressure, so that the glue is lacked in the product, and the yield is reduced. If the pressure is continuously applied, the sealing part can fail, and the sealing part can have the phenomenon of glue overflow.
Comparative example
As shown in fig. 2, the conventional liquid silicone injection mold without a reverse glue port is used for silicone injection:
firstly, placing a plastic part mould into a cavity of a lower mould, and fixing the plastic part mould in the lower mould; the guide posts and the guide sleeves respectively arranged in the upper die and the lower die are utilized to nest the guide sleeves in the guide posts, so that the upper die and the lower die can be accurately placed on the lower die in the die assembly process; a circle of sealing material is added at the edge of the contact part of the upper die and the lower die to form a sealing part (the length is 0.3mm, the width is 0.1 mm), and the sealing part is in a knife edge shape pressed into the plastic part die; at this time, the upper die, the lower die, the cavity and the plastic part die form a closed space together.
Then, starting to feed glue from a glue feeding port on the upper die, wherein air is arranged in a space (die cavity) formed by the upper die, the lower die, the die cavity and the plastic part die, and the air can form glue feeding resistance; the air in the die cavity cannot be discharged due to the structural structure, and the sizing material cannot be injected into the die cavity due to air blocking, so that bad phenomena such as air trapping and sizing shortage are caused.
If the pressure of the glue entering from the glue inlet is increased for smooth glue feeding, the pressure can break through the sealing material added at the edge of the contact part of the upper die and the lower die, so that the glue overflows along the plastic part die towards the glue sealing part.
In summary, compared with the existing liquid silica gel injection mold, the embodiment can balance the glue inlet pressure of the glue inlet, control the flow rate of the liquid silica gel, and avoid the glue overflow phenomenon caused by the fact that the liquid silica gel inside the cavity breaks the glue sealing position due to overlarge pressure; air in the containing cavity can be discharged, and the phenomenon of glue shortage of liquid silica gel injection molding products caused by trapped air can be avoided.
Claims (5)
1. A liquid silica gel injection mold with a reverse glue port, wherein a cavity (10) is arranged in a lower mold (6), a plastic part mold (1) with a matched shape is arranged in the cavity (10), and the cavity (10) clamps the plastic part mold (1) in the lower mold (6); the lower die (6) is provided with a guide post, the upper die (5) is provided with a guide sleeve corresponding to the guide post in position, the guide sleeve is sleeved on the guide post, and the upper die (5) is closely attached to the lower die (6); the outer edge of the contact surface of the upper die (5) and the lower die (6) is provided with a circle of sealing piece to form a sealing glue position (3); a cavity is formed among the upper die (5), the lower die (6), the cavity (10) and the plastic part die (1); the edge of the top of the upper die (5) is provided with a glue inlet (7), and the glue inlet (7) penetrates through the upper die (5) and is communicated with the top of the cavity through a glue inlet runner (12); the method is characterized in that:
a glue reflecting opening (8) is arranged at a set distance between the top of the upper die (5) and the glue inlet (7); a glue-reflecting port runner (11) penetrating through the inside of the upper die (5) is arranged at the glue-reflecting port (8) along the bottom direction of the upper die (5), and the glue-reflecting port (8) is communicated with the top of the cavity through the glue-reflecting port runner (11);
the aperture of the glue reflecting opening (8) is smaller than the aperture of the glue inlet (7).
2. The liquid silicone injection mold with a reverse glue port according to claim 1, wherein: the minimum aperture of the glue reflecting opening (8) is phi 0.4mm, and the maximum aperture of the glue reflecting opening (8) is less than or equal to half of the aperture of the glue inlet (7).
3. The liquid silicone injection mold with a reverse glue port according to claim 2, wherein: the diameter of the glue inlet runner (12) is the same as the aperture of the glue inlet (7), and the diameter of the glue return runner (11) is the same as the aperture of the glue return (8); the glue-reflecting opening (8) is used for balancing the glue-feeding pressure of the glue-feeding opening (7); the glue reflecting port (8) is also used for discharging air in the containing cavity.
4. The liquid silicone injection mold with a reverse glue port according to claim 1, wherein: the glue-reflecting opening (8) is arranged at the axisymmetric position of the glue inlet (7) on the top of the upper die (5).
5. The liquid silicone injection mold with a reverse glue port according to claim 1, wherein: the position of the reverse glue port (8) is the position range where the liquid silica gel is injected into the containing cavity from the glue inlet (7) through the glue inlet runner (12) until the containing cavity is filled up quickly, and the liquid silica gel extrudes the air in the containing cavity to the air converging position at the bottom of the upper die (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320473664.4U CN220499776U (en) | 2023-03-14 | 2023-03-14 | Liquid silica gel injection mold with reverse glue port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320473664.4U CN220499776U (en) | 2023-03-14 | 2023-03-14 | Liquid silica gel injection mold with reverse glue port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220499776U true CN220499776U (en) | 2024-02-20 |
Family
ID=89871716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320473664.4U Active CN220499776U (en) | 2023-03-14 | 2023-03-14 | Liquid silica gel injection mold with reverse glue port |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220499776U (en) |
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2023
- 2023-03-14 CN CN202320473664.4U patent/CN220499776U/en active Active
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