CN111347632A - Totally closed cold runner of easy dismouting - Google Patents
Totally closed cold runner of easy dismouting Download PDFInfo
- Publication number
- CN111347632A CN111347632A CN201811579047.2A CN201811579047A CN111347632A CN 111347632 A CN111347632 A CN 111347632A CN 201811579047 A CN201811579047 A CN 201811579047A CN 111347632 A CN111347632 A CN 111347632A
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- CN
- China
- Prior art keywords
- needle
- cooling
- valve needle
- cold runner
- closed cold
- Prior art date
- 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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Links
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000001746 injection moulding Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 abstract description 30
- 229920003023 plastic Polymers 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
Images
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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C45/281—Drive means therefor
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an easily disassembled and totally closed cold runner which comprises a needle drawing mechanism, a cooling mechanism, a valve needle, a rubber sealing sleeve, a pressure bearing plate, a heat insulating part and a head insert, wherein the valve needle is connected with the needle drawing mechanism through a screw, the cooling mechanism comprises an outer cooling part, an inner cooling part and a rubber sealing plate, the inner cooling part is arranged in an inner hole of the outer cooling part and is sealed by the rubber sealing plate, the heat insulating part is sleeved outside the outer cooling part, the valve needle is arranged on the needle drawing mechanism and penetrates through a center hole of the rubber sealing sleeve and a center hole of the inner cooling part to be matched with the head insert, and the heat insulating part is made of a plastic material and also serves as a sealing part of the cooling mechanism. The beneficial effect of adopting above-mentioned technical scheme is: the valve needle is arranged to control the opening and closing of the flow passage, and the cooling system is arranged to control the temperature of the flow passage, so that the temperature of the flow passage is not too high and the plastic is not solidified.
Description
Technical Field
The invention relates to the technical field of molds, in particular to an easily-disassembled fully-closed cold runner.
Background
When the thermosetting material is manufactured, the material is fixedly molded at high temperature, and the whole set of die is in a high-temperature state, so that the raw material is not cured before entering a cavity. And the glue inlet is sealed after the glue is completely removed, so that the raw material is prevented from overflowing. Therefore, it is necessary to design and develop an easily detachable fully-enclosed cold runner.
Disclosure of Invention
The invention aims to provide an easily-disassembled fully-closed cold runner.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides an easy totally closed cold runner of disassembling, includes needle mechanism, cooling body, needle, seals gum cover, bearing plate, heat-insulating part, head mold insert, needle and needle mechanism screwed connection take out, cooling body includes outer cooling part, interior cooling part, seals the offset plate.
The inner cooling part is arranged in the inner hole of the outer cooling part and is sealed by a sealing glue plate.
The heat insulation piece is sleeved outside the outer cooling piece.
The valve needle is arranged on the needle drawing mechanism and penetrates through the center hole of the rubber sealing sleeve and the center hole of the internal cooling part to be matched with the head insert.
The clearance between the valve needle and the head insert is less than 0.05 mm.
The clearance between the valve needle and the pressure bearing plate is less than 0.05 mm.
The clearance between the valve needle and the rubber sealing sleeve is less than 0.05 mm.
The clearance between the valve needle and the head insert is less than 0.05 mm.
The heat insulation piece is made of plastic materials and is also used as a sealing piece of the cooling mechanism and the head insert.
The time period of withdrawing the valve needle is the filling time and the pressure maintaining time period of the injection molding process.
The beneficial effect of adopting above-mentioned technical scheme is: the valve needle is arranged to control the opening and closing of the flow passage, and the cooling system is arranged to control the temperature of the flow passage, so that the temperature of the flow passage is not too high and the plastic is not solidified.
Drawings
Fig. 1 is an exploded view of an easily disassembled fully-enclosed cold runner.
Fig. 2 is a plan view of an easily disassembled and fully closed cold runner.
In the figure, 1-a needle drawing mechanism, 2-a pressure bearing plate, 3-a rubber sealing sleeve, 4-a rubber sealing plate, 5-a heat insulation part, 6-a head insert, 7-an inner cooling part, 8-an outer cooling part and 9-a valve needle.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the fully-closed cold runner easy to disassemble comprises a needle drawing mechanism, a cooling mechanism, a valve needle, a rubber sealing sleeve, a pressure bearing plate, a heat insulation piece and a head insert, wherein the valve needle is in screw connection with the needle drawing mechanism, and the cooling mechanism comprises an outer cooling piece, an inner cooling piece and a rubber sealing plate.
The inner cooling part is arranged in the inner hole of the outer cooling part and is sealed by a sealing glue plate.
The heat insulation piece is sleeved outside the outer cooling piece.
The valve needle is arranged on the needle drawing mechanism and penetrates through the central hole of the inner cooling part to be matched with the head insert.
The clearance between the valve needle and the head insert is less than 0.05 mm.
The clearance between the valve needle and the pressure bearing plate is less than 0.05 mm.
The clearance between the valve needle and the rubber sealing sleeve is less than 0.05 mm.
The clearance between the valve needle and the head insert is less than 0.05 mm.
The inner cooling piece and the outer cooling piece are bushings made of stainless steel materials.
The heat insulation piece is made of plastic materials and is also used as a sealing piece of the cooling mechanism and the head insert.
The needle drawing mechanism is generally made into pneumatic, namely, a cylinder is used for connecting the valve needle, or the needle drawing mechanism is made into electric, and an electromagnetic valve is used for connecting the valve needle, so that the needle drawing mechanism can be made into hydraulic.
Thermosetting plastics can soften and flow when heated for the first time, and heat to a certain temperature to generate a chemical reaction-a cross-linking reaction to solidify and harden, and the change is irreversible, and then can not soften and flow again when heated again. It is with this characteristic that the molding process is carried out, and the mold cavity is filled under pressure by utilizing the plastic flow at the first heating, and is further solidified into a product of a certain shape and size. The mould is designed according to the principle, the temperature is not too high when the mould is heated for the first time, the plastic can flow and the cross-linking chemical reaction can not occur, the temperature is lower than the temperature of the second heating, when the plastic is heated for the second time, the temperature of the plastic is very high, the auxiliary agent in the plastic plays a role, the plastic is enabled to have the chemical reaction, the reaction is irreversible, and the plastic can not be heated and softened any more. Therefore, the temperature of the runner needs to be kept constant, the temperature of the mold cavity needs to be kept stable, and the temperature difference between the runner and the mold cavity is large, so that the cooling mechanism and the heat insulation piece are arranged in the runner, and the heat transfer from the high temperature of the mold cavity to the low temperature of the runner is prevented by the arrangement of the cooling mechanism and the heat insulation piece. The valve needle is used for opening and closing the flow channel to enter the cavity, if the valve needle is not arranged, the plastic in the flow channel can automatically flow to the cavity after the product is demoulded, and the plastic can be cross-linked and hardened at the edge of the glue inlet to block the flow channel, so that the subsequent production is influenced.
Thermosetting plastics are characterized by that after a certain time of heating, pressurizing or adding hardening agent, they are chemically reacted and hardened at a certain temp. The hardened plastic has changed chemical structure, hard texture, insolubility in solvent, no softening after heating, and decomposition after high temperature. The molecular chains of the resin in the thermoplastic plastic are all in a linear or branched structure, no chemical bonds are generated among the molecular chains, and the process of softening, flowing and hardening is physical change when being heated and cooled. The design of the mold is that the plastic only changes physically in the runner and only changes from solid state to liquid state, and when the plastic changes chemically in the cavity, the plastic is crosslinked into macromolecules by micromolecules and then becomes the shape of a product in the mold. This is the purpose of this mold.
The external cooling part is provided with a cooling water interface and an external water pipe, so the external cooling part is provided with a thread connected with the water pipe connecting piece.
It can be seen that this mold has the following features:
and 1, pushing the valve needle to open and close by using a cylinder assembly (or other hydraulic propellers).
And 2, isolating the external temperature of the mold by using a high-temperature-resistant heat-insulating material, so that the temperature of the runner is not influenced by the outside and is kept in a cooling state all the time.
And 3, cooling the flow channel system by using cooling water or cooling liquid, so that the flow channel is always in a low-temperature state.
And 4, using a replaceable insert at the glue inlet part, and adjusting the shape of the insert according to the shape of the product.
5, the whole structure is in a sealed state to ensure that the raw materials cannot overflow.
6, the die gap in the area through which the plastic flows is less than 0.05 mm.
The temperature of the cold runner is kept below the temperature at which the plastic crosslinks. The mould also has sealing elements, such as sealing rubber rings in the mould gap and sealing rubber rings in the cooling oil, etc., which are not shown.
The injection molding process is divided into six stages: the method comprises a mold closing stage, a filling stage, a pressure maintaining stage, a cooling stage, a mold opening stage and an ejection stage.
And a mold closing stage, namely, the front mold and the rear mold of the mold are closed together, wherein the mold closing is divided into low-pressure mold closing and high-pressure mold closing.
The fill phase is the first step in the overall injection cycle, from the time the mold is closed to start injection until the mold cavity is filled to about 95%. Theoretically, the shorter the filling time, the higher the molding efficiency; however, in actual production, the molding time (or injection molding speed) is limited by many conditions. The filling stage is divided into high-speed filling and low-speed filling.
The effect of the dwell phase is to continuously apply pressure to compact the melt and increase the density of the plastic (densification) to compensate for the shrinkage behaviour of the plastic. During the dwell process, the back pressure is high because the mold cavity is already filled with plastic. During the pressure-maintaining compaction process, the screw of the injection molding machine can only slightly move forward slowly, the flow speed of the plastic is slow, and the flow is called pressure-maintaining flow. In the pressure maintaining stage, the cooling and solidification of the plastic mold wall is accelerated, and the viscosity of the melt is increased quickly, so that the resistance in the mold cavity is high. In the later stage of pressure maintaining, the material density is continuously increased, the plastic part is gradually formed, the pressure maintaining stage is continued until the sprue is solidified and sealed, and the pressure of the mold cavity in the pressure maintaining stage reaches the highest value.
In injection molding molds, the design of the cooling system is very important. The reason is that the formed plastic product can not be deformed due to external force after being demoulded until the formed plastic product is cooled and solidified to certain rigidity. The cooling time accounts for about 70-80% of the whole molding cycle, so that the well designed cooling system can greatly shorten the molding time, improve the injection molding productivity and reduce the cost. An improperly designed cooling system can prolong the forming time and increase the cost; uneven cooling further causes warpage of the plastic article.
And a mold opening stage, namely opening the mold to eject the product.
Demolding is the last step in an injection molding cycle. Although the product is formed by cold setting, demoulding still has important influence on the quality of the product, and improper demoulding mode can cause the defects of uneven stress of the product during demoulding, deformation of the product during ejection and the like. The demolding mode mainly comprises two modes, namely ejector rod demolding and stripper plate demolding. When the mold is designed, a proper demolding mode is selected according to the structural characteristics of the product so as to ensure the product quality.
From the above process, it can be seen that the cold runner system can be configured to withdraw the valve pin during the filling time + pressure holding time of the injection molding process, so as to allow the plastic to flow through, and during the cooling time + mold opening time + mold releasing time + mold closing time in the injection molding process, the valve pin and the head insert are together, so that the material flow cannot flow.
The period of withdrawing the valve needle is the filling time and the pressure maintaining period of the injection molding process, and the rest of the period is closing of the valve needle and the head insert. Therefore, the needle drawing mechanism is connected to a control circuit of the injection molding machine so as to facilitate the synchronization of the valve needle and the injection molding process. The electromagnetic valve of the needle drawing mechanism is connected with a controller circuit of the injection molding machine.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. The utility model provides an easy totally closed cold runner of disassembling which characterized in that: the needle drawing mechanism comprises a needle drawing mechanism, a cooling mechanism, a needle, a rubber sealing sleeve, a bearing plate, a heat insulation part and a head insert, wherein the needle is in screw connection with the needle drawing mechanism, and the cooling mechanism comprises an outer cooling part, an inner cooling part and a rubber sealing plate.
2. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the inner cooling part is arranged in the inner hole of the outer cooling part and is sealed by a sealing glue plate.
3. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the valve needle is arranged on the needle drawing mechanism and penetrates through the center hole of the rubber sealing sleeve and the center hole of the internal cooling part to be matched with the head insert.
4. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the clearance between the valve needle and the head insert is less than 0.05 mm.
5. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the clearance between the valve needle and the pressure bearing plate is less than 0.05 mm.
6. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the clearance between the valve needle and the rubber sealing sleeve is less than 0.05 mm.
7. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the clearance between the valve needle and the head insert is less than 0.05 mm.
8. The easy-to-disassemble fully-closed cold runner as claimed in claim 1, wherein: the time period of withdrawing the valve needle is the filling time and the pressure maintaining time period of the injection molding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579047.2A CN111347632A (en) | 2018-12-24 | 2018-12-24 | Totally closed cold runner of easy dismouting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579047.2A CN111347632A (en) | 2018-12-24 | 2018-12-24 | Totally closed cold runner of easy dismouting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111347632A true CN111347632A (en) | 2020-06-30 |
Family
ID=71195208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811579047.2A Withdrawn CN111347632A (en) | 2018-12-24 | 2018-12-24 | Totally closed cold runner of easy dismouting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111347632A (en) |
-
2018
- 2018-12-24 CN CN201811579047.2A patent/CN111347632A/en not_active Withdrawn
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200630 |
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| WW01 | Invention patent application withdrawn after publication |