CN110001011B - Multi-layer porous external air auxiliary injection mould - Google Patents
Multi-layer porous external air auxiliary injection mould Download PDFInfo
- Publication number
- CN110001011B CN110001011B CN201910305492.8A CN201910305492A CN110001011B CN 110001011 B CN110001011 B CN 110001011B CN 201910305492 A CN201910305492 A CN 201910305492A CN 110001011 B CN110001011 B CN 110001011B
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- die
- movable
- movable mould
- thin plates
- mould
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002347 injection Methods 0.000 title claims abstract description 20
- 239000007924 injection Substances 0.000 title claims abstract description 20
- 238000005485 electric heating Methods 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 229920000642 polymer Polymers 0.000 abstract description 17
- 239000003292 glue Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
-
- 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
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
- B29C45/345—Moulds having venting means using a porous mould wall or a part thereof, e.g. made of sintered metal
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76006—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76177—Location of measurement
- B29C2945/76254—Mould
- B29C2945/76257—Mould cavity
Abstract
The invention discloses a multi-layer porous external gas auxiliary injection mold, which realizes that high-pressure gas presents large flow, high pressure and no pressure gradient when reaching the back of a polymer product, thereby ensuring the smoothness and precision of the back of the product, and comprises a mold body with a main cavity inside; the die comprises a die body, wherein a plurality of layers of thin plates with a plurality of air holes are arranged in the die body above the main cavity, the thin plates are arranged at intervals up and down, an air inlet is formed in the top of the die body, and glue injection holes are formed in the bottom of the die body.
Description
Technical Field
The invention relates to the field of polymer injection molds, in particular to a multi-layer porous external air auxiliary injection mold.
Background
Gas-assisted injection molding is an emerging injection molding process that includes internal and external gas-assisted injection molding. The former is to inject high-pressure gas into the melt to form a hollow product, and the latter is to inject high-pressure gas between the melt and the mold wall to form a pressure maintaining film for reducing or eliminating defects such as warping, dent and the like of the product.
And (3) performing external air assisted injection molding, wherein the shrinkage characteristic of the polymer is compensated on the back of the polymer product by using high-pressure air, so that the defects such as warpage, dent and the like on the back of the polymer product are reduced or eliminated. In this process, the injection mold must be in a sealed state where the high pressure gas passes through.
At present, the common external air auxiliary injection mold at home and abroad is to directly inject high-pressure air into a space between a melt and a mold wall in a single or multiple hole mode to form a pressure maintaining film. However, this way of gas introduction results in large flows, high pressures and significant pressure gradients, and direct contact with the polymer melt leads to the occurrence of gas marks. This phenomenon directly affects the smoothness and precision of the back side of the polymer product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to the actual needs, and provide a multilayer porous external gas auxiliary injection mould, so that high-pressure gas can present large flow, high pressure and no pressure gradient when reaching the back of a polymer product, thereby ensuring the smoothness and precision of the back of the product.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
designing a multi-layer porous external air auxiliary injection mold, which comprises a mold body with a main cavity inside; the die body above the main cavity is internally provided with a plurality of layers of thin plates with a plurality of air holes, the thin plates are arranged at intervals up and down, and the top of the die body is provided with an air inlet hole.
The die body comprises a top die, a movable die and a bottom die, the movable die is positioned on the bottom die, the main cavity is positioned between the movable die and the bottom die, the top die is positioned on the movable die, and the multilayer thin plate is positioned on the movable die; the air inlets are positioned at the left side and the right side of the top die and are symmetrically arranged.
The movable mould comprises a first movable mould and a second movable mould, the first movable mould is in a dustpan shape, the left side wall and the right side wall of the first movable mould are respectively provided with sliding grooves with the same number as the thin plates, the end parts of the sliding grooves penetrate through the front end of the first movable mould, the thin plates are inserted into the sliding grooves on the left side and the right side of the first movable mould in a one-to-one correspondence manner, the end parts of the thin plates protrude to the front of the first movable mould, the second movable mould is a side plate, the side wall of the second movable mould is provided with notches with the same number as the thin plates, the second movable mould is fixed at the front end of the first movable mould, and the notches are clamped at the front end of the thin plates in a one-to-one correspondence manner; the bottom of the first movable mould is provided with a plurality of round holes which are arranged in a matrix.
The bottom die is provided with a concave die which is concave downwards, the bottom of the first movable die is provided with a convex die, a round hole penetrates through the convex die, and when the movable die is fixed on the bottom die, the convex die is located in the concave die.
The air holes on the thin plate are arranged in a matrix, the pore diameters of the air holes on the same thin plate are the same, and the air holes on the thin plate are gradually reduced from top to bottom.
The air holes on the upper and lower adjacent thin plates are no longer on the same axis.
The pore diameter of the air hole is 1mm-2.5mm.
The air holes are micron-sized holes made in a sintering mode.
Pressure measuring holes are respectively formed in the side wall of the movable die and the side wall of the bottom die, and pressure sensors are connected to the pressure measuring holes.
And a high-temperature-resistant sealant layer is coated between the connecting surfaces of the top die and the movable die and between the connecting surfaces of the movable die and the bottom die.
And an electric heating ring or an electric heating strip is arranged on the thin plate.
The invention has the beneficial effects that:
1. different from the original external gas auxiliary injection mold air inlet, the design is provided with the air inlet in the opposite direction at the same time, and the high-pressure gas enters from the opposite direction at the same time, so that the pressure gradient difference of the high-pressure gas is relieved or reduced.
2. The high-pressure gas enters the air holes on the multi-layer thin plate, so that the pressure gradient difference of the high-pressure gas is further relieved or even eliminated, the gas is guaranteed to realize a pressure maintaining film with high pressure, high flow and no pressure gradient difference on the back of the product, and the smoothness and precision of the back of the product are guaranteed.
Drawings
FIG. 1 is a schematic diagram of the combined structure of the various parts of the present design;
FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;
FIG. 3 is a schematic diagram of the main structure of the top mold, the movable mold and the bottom mold in the present design;
FIG. 4 is a schematic view of the main structure of the split state of each part in the present design;
FIG. 5 is a schematic view of the bottom structure of the first movable mold in the present design in a three-dimensional state;
FIG. 6 is a schematic view of the main structure of the present design in a sectional state;
fig. 7 is a schematic diagram of the pressure regulating balance principle.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
example 1: a multi-layer porous external air-assisted injection mold, see fig. 1-7;
the die comprises a die body, wherein a main cavity 17 is formed in the die body, and particularly the die body comprises a top die 1, a movable die and a bottom die 4, wherein the movable die is positioned on the bottom die 4, the main cavity is positioned between the movable die and the bottom die, and the top die 1 is positioned on the movable die.
The design is characterized in that a plurality of thin plates 9 with a plurality of specific air holes 10 are arranged in a movable die above a main cavity, the thin plates 9 are arranged at intervals up and down, and the thin plates are positioned on the movable die; the air inlets are positioned at the left side and the right side of the top die and are symmetrically arranged. Meanwhile, the top of the top die 1 is provided with air inlets 5, the bottom die is provided with glue injection holes 8, and six air inlets 5 are symmetrically arranged on the side walls of the left side and the right side of the top die respectively.
Specifically, the movable mold comprises a first movable mold 2 and a second movable mold 3, the first movable mold 2 is in a dustpan shape, the front end of the first movable mold 2 is provided with notches, the left side wall and the right side wall of the first movable mold 2 are respectively provided with sliding grooves 12 with the same number as that of the thin plates, the end parts of the sliding grooves 12 penetrate through the front end of the first movable mold 2, the thin plates 9 are inserted into the sliding grooves 12 on the left side and the right side of the first movable mold 2 in a one-to-one correspondence manner, the end parts of the thin plates 9 protrude to the front of the first movable mold, the second movable mold 3 is a side plate, the side wall of the second movable mold 3 is provided with notches 15 with the same number as that of the thin plates, the second movable mold 3 is fixed at the front end of the first movable mold 2, and the notches 15 are blocked at the front end of the thin plates 9 in a one-to-one correspondence manner; meanwhile, the bottom 13 of the first movable mold is provided with a plurality of circular holes 14 which are arranged in a matrix.
Further, a concave die 11 recessed downwards is formed on the bottom die 4, a convex die 16 is arranged at the bottom of the first movable die, a round hole penetrates through the convex die, and when the movable die is fixed on the bottom die, the convex die is located in the concave die.
In this design, the fixed connection between the top mold 1 and the first moving mold, the second moving mold, the first moving mold, the second moving mold and the bottom mold 4 adopts a bolt connection mode, and in order to ensure the tightness between the connection surfaces and prevent the air leakage of each part, the flatness and roughness of the mutually assembled surfaces must be ensured when the fixed mold, the moving mold and the top mold are required to be processed, if not ensured, a high temperature resistant sealant layer can be coated between the connection surfaces of the top mold and the moving mold and between the connection surfaces of the moving mold and the bottom mold.
Furthermore, the air holes on the thin plates in the design are arranged in a matrix, the pore diameters of the air holes on the same thin plate are the same, the air holes on the thin plates are gradually reduced from top to bottom, the air holes on the upper and lower adjacent thin plates are no longer on the same axis, namely, any air hole on any thin plate is no longer on the same axis as any air hole on the adjacent thin plate, thus the high-enterprise air can be buffered and uniformly distributed,
the pore sizes of the pores on each sheet in the present design are distributed between 1mm and 2.5mm, and in principle the pore sizes on the same sheet are the same. In addition, the air holes can be micro-scale holes made by sintering.
In order to prevent polymer melt from being retained in the air holes of the cavity in the movable mould in the process of injecting glue, an electric heating ring or an electric heating strip is arranged around the inner wall of the movable mould, or the electric heating ring or the electric heating strip is arranged on the thin plate for heating so as to prevent the polymer melt retained in the air holes from solidifying and blocking the air holes.
The side wall of the movable mould and the side wall of the bottom mould are respectively provided with pressure measuring holes 6 and 7, the pressure measuring holes are respectively connected with a gas pressure sensor and a polymer melt pressure sensor, the pressure sensors arranged on the side wall of the bottom mould and the side wall of the movable mould can be respectively used for detecting the melt pressure of the main cavity, the pressure sensor of the movable mould is used for detecting the pressure of the high-pressure gas pressure maintaining film, the pressure of the movable mould and the pressure sensor of the movable mould can be jointly conveyed into a differential pressure controller in specific implementation, and the pressure of the movable mould and the pressure sensor can be regulated by the differential pressure controller to regulate the pressure of the high-pressure gas regulating switch so as to realize pressure balance of the movable mould and the side wall of the movable mould, and a schematic diagram of the movable mould is shown in figure 7.
The multi-layer porous external air auxiliary injection mould of this design is in the implementation process:
firstly, injecting polymer melt into the injection mould from a glue injection hole on a bottom mould, at the moment, heating by an electric heating ring or an electric heating strip to prevent the polymer melt from flowing into a thin plate air hole and remaining in the air hole to influence the pressure uniformity of high-pressure gas on the back surface of the product, and heating by the electric heating ring or the electric heating strip to enable the temperature to be higher than the melting point temperature of the polymer by 5 ℃, so that the polymer melt is in a fluid state when the high-pressure gas is injected into the thin plate.
After that, high-pressure gas is injected into the injection mold through six air inlets, and reaches the back surface of the polymer melt through the air holes on the layer-by-layer thin plate, so that the pressure maintaining film with high pressure, large flow and no pressure gradient difference is realized; when high-pressure gas starts to be injected, the electric heating ring or the electric heating strip stops heating, and finally the polymer melt is cooled and maintained under the action of the back gas pressure maintaining film, so that the smoothness and precision of the back surface of the product are ensured.
In conclusion, this design is different with original external gas auxiliary injection mold air inlet, and this design is equipped with the air inlet simultaneously in opposite direction, and high-pressure gas gets into simultaneously from opposite direction, alleviates or has reduced the pressure gradient difference of high-pressure gas, and the high-pressure gas gets into the gas pocket on the multilayer sheet, further alleviates even eliminates the pressure gradient difference of high-pressure gas to guarantee that gas realizes the pressurize membrane of high pressure, large-traffic and no pressure gradient difference in the work in process back, thereby guarantee the smoothness and the precision in work in process back.
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various extensions and modifications can be made without departing from the spirit of the present invention.
Claims (1)
1. A multi-layer porous external gas auxiliary injection mold comprises a mold body with a main cavity inside; the method is characterized in that: a plurality of layers of thin plates with a plurality of air holes are arranged in the die body above the main cavity, the thin plates are arranged at intervals up and down, the top of the die body is provided with an air inlet hole, and the bottom of the die body is provided with an adhesive injection hole;
the die body comprises a top die, a movable die and a bottom die, the movable die is positioned on the bottom die, the main cavity is positioned between the movable die and the bottom die, the top die is positioned on the movable die, and the multilayer thin plate is positioned on the movable die; the air inlets are positioned at the left side and the right side of the top die and are symmetrically arranged;
the movable mould comprises a first movable mould and a second movable mould, the first movable mould is in a dustpan shape, the left side wall and the right side wall of the first movable mould are respectively provided with sliding grooves with the same number as the thin plates, the end parts of the sliding grooves penetrate through the front end of the first movable mould, the thin plates are inserted into the sliding grooves on the left side and the right side of the first movable mould in a one-to-one correspondence manner, the end parts of the thin plates protrude to the front of the first movable mould, the second movable mould is a side plate, the side wall of the second movable mould is provided with notches with the same number as the thin plates, the second movable mould is fixed at the front end of the first movable mould, and the notches are clamped at the front end of the thin plates in a one-to-one correspondence manner; the bottom of the first movable die is provided with a plurality of round holes which are arranged in a matrix;
the bottom die is provided with a concave die which is concave downwards, the bottom of the first movable die is provided with a convex die, a round hole penetrates through the convex die, and when the movable die is fixed on the bottom die, the convex die is positioned in the concave die;
the air holes on the thin plate are arranged in a matrix, the pore diameters of the air holes on the same thin plate are the same, and the air holes on the thin plate are gradually reduced from top to bottom;
the air holes on the upper and lower adjacent thin plates are not on the same axis;
the aperture of the air hole is 1mm-2.5mm; or the air holes are micron-sized holes made in a sintering mode;
a high-temperature-resistant sealant layer is coated between the connecting surfaces of the top die and the movable die and between the connecting surfaces of the movable die and the bottom die;
and an electric heating ring or an electric heating strip is arranged on the thin plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305492.8A CN110001011B (en) | 2019-04-16 | 2019-04-16 | Multi-layer porous external air auxiliary injection mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305492.8A CN110001011B (en) | 2019-04-16 | 2019-04-16 | Multi-layer porous external air auxiliary injection mould |
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| Publication Number | Publication Date |
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| CN110001011A CN110001011A (en) | 2019-07-12 |
| CN110001011B true CN110001011B (en) | 2024-03-08 |
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| CN201910305492.8A Active CN110001011B (en) | 2019-04-16 | 2019-04-16 | Multi-layer porous external air auxiliary injection mould |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111002600B (en) * | 2019-12-18 | 2021-06-25 | 香港中文大学（深圳） | Suspension closed hole array structure, preparation method, application and preparation device thereof |
| TWI782267B (en) * | 2020-04-01 | 2022-11-01 | 瑞皇精密工業股份有限公司 | Improved mold structure |
| CN113232243B (en) * | 2021-01-16 | 2022-12-06 | 温州南冠机械有限公司 | SCR denitration catalyst production mold and production method thereof |
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| CN211194793U (en) * | 2019-04-16 | 2020-08-07 | 上饶师范学院 | Multi-layer porous external gas auxiliary injection mold |
-
2019
- 2019-04-16 CN CN201910305492.8A patent/CN110001011B/en active Active
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|---|---|---|---|---|
| JPH07314483A (en) * | 1994-05-20 | 1995-12-05 | Idemitsu Petrochem Co Ltd | Method and mold for gas-injection molding |
| JP2012066384A (en) * | 2010-09-21 | 2012-04-05 | Ube Machinery Corporation Ltd | Gas-assist molding mold and gas-assist molding method |
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| Publication number | Publication date |
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| CN110001011A (en) | 2019-07-12 |
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