CN112721060A - Hot mouth heat insulation device of mould and injection mould - Google Patents
Hot mouth heat insulation device of mould and injection mould Download PDFInfo
- Publication number
- CN112721060A CN112721060A CN202011641697.2A CN202011641697A CN112721060A CN 112721060 A CN112721060 A CN 112721060A CN 202011641697 A CN202011641697 A CN 202011641697A CN 112721060 A CN112721060 A CN 112721060A
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- Prior art keywords
- mold
- heat insulation
- hot nozzle
- cooling
- insulation sleeve
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- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 64
- 238000002347 injection Methods 0.000 title claims abstract description 15
- 239000007924 injection Substances 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 239000000110 cooling liquid Substances 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005336 cracking Methods 0.000 abstract description 5
- 239000000498 cooling water Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000009826 distribution Methods 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007306 turnover Effects 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
-
- 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
-
- 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
- B29C2045/2743—Electrical heating element constructions
-
- 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
- B29C2045/2753—Heating means and cooling means, e.g. heating the runner nozzle and cooling the nozzle tip
-
- 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
- B29C2045/2766—Heat insulation between nozzle and mould
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a mold hot nozzle heat insulation device and an injection mold, which comprise a heat insulation sleeve and a circulating cooling system, wherein the heat insulation sleeve is fixed in the mold and is sleeved on the periphery of a hot nozzle, the circulating cooling system comprises a flow guide pipe and a cooling pipe, and the cooling pipe is arranged in the heat insulation sleeve and is communicated with an external cooling liquid circulating system through the flow guide pipe. The invention can reduce the heat conduction on the hot nozzle to the die, so as to reduce the phenomena of cracking and difficult demoulding of the die caused by thermal expansion, thereby improving the precision of the die.
Description
Technical Field
The invention relates to the technical field of molds, in particular to a mold hot nozzle heat insulation device and an injection mold.
Background
The hot runner ensures that the plastic of the runner and the sprue keeps a molten state by a heating method, the hot runner system generally comprises a hot nozzle, a flow distribution plate and the like, and because a heating rod and a heating ring are arranged near or in the center of the runner, the whole runner from the nozzle outlet of the injection molding machine to the sprue is in a high-temperature state, so that the plastic in the runner keeps a molten state, but the hot nozzle has higher temperature, so that the heat is transmitted to the template to cause the template to generate thermal expansion, thereby influencing the precision of the mold, causing the produced product to be unusable, and influencing the quality and the qualification rate of the product.
Because the hot nozzle form directly determines the selection of the hot runner system and the manufacture of the mold, in the prior art, the common hot runner system is only provided with a heat insulation sleeve at the head sleeve of the hot nozzle, however, the heat conduction generated by the hot nozzle cannot be reduced to the template by simply using the heat insulation sleeve, and therefore, a mold hot nozzle heat insulation device and an injection mold capable of reducing the heat conduction of the hot nozzle to the template are urgently needed to solve the technical problems in the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a hot nozzle heat insulation device of a mold and an injection mold, which can reduce the heat conduction on a hot nozzle to the mold so as to reduce the phenomena of cracking and difficult demolding of the mold caused by thermal expansion, thereby improving the precision of the mold.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a thermal insulation device for a hot nozzle of a mold, which comprises a thermal insulation sleeve and a circulating cooling system, wherein the thermal insulation sleeve is fixed in the mold and sleeved on the periphery of the hot nozzle, the circulating cooling system comprises a flow guide pipe and a cooling pipe, and the cooling pipe is arranged in the thermal insulation sleeve and is communicated with an external cooling liquid circulating system through the flow guide pipe.
In some embodiments, the heat insulation sleeve further comprises a pressing plate fixedly connected with the mold, a convex ring is arranged on the heat insulation sleeve, and the pressing plate is pressed on the convex ring to fixedly connect the heat insulation sleeve and the mold.
In some embodiments, the pressure plate is secured to the mold by screws.
In some embodiments, the caliber of the cooling pipe is gradually increased along the injection flow direction of the hot nozzle.
In some embodiments, the end of the cooling tube is provided with an inclined portion.
In some embodiments, a sealing ring for preventing the liquid leakage of the flow guide pipe is arranged at the joint of the heat insulation sleeve and the mold.
In another aspect, the invention also provides an injection mold, which comprises the mold hot nozzle heat insulation device.
In some embodiments, the hot nozzle is a flow passage structure with a heating wire arranged inside.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a mold hot nozzle heat insulation device which comprises a heat insulation sleeve and a circulating cooling system, wherein the heat insulation sleeve is fixed in a mold and sleeved on the periphery of a hot nozzle, the circulating cooling system comprises a flow guide pipe and a cooling pipe, and the cooling pipe is arranged in the heat insulation sleeve and communicated with an external cooling liquid circulating system through the flow guide pipe. According to the invention, by injecting cooling water into the flow guide pipe and the cooling pipe, the cooling water can take away heat on the hot nozzle, so that the heat generated on the hot nozzle is prevented from being transferred to the die, thereby reducing the phenomena of cracking and difficult demoulding of the die caused by thermal expansion and improving the precision of the die.
2. According to the heat insulation device for the hot nozzle of the mold, the caliber of the cooling pipe is gradually increased along the injection flow direction of the hot nozzle, the inclined part is arranged at the tail end of the cooling pipe, so that the resistance difference of the cooling pipe inside the heat insulation sleeve can be formed by utilizing the distance difference between the inclined part and the opening end of the cooling pipe, and cold water can automatically circulate in the cooling pipe.
3. The invention provides an injection mold which comprises a mold hot nozzle heat insulation device, wherein the hot nozzle is of a runner structure, and heating wires are distributed in the hot nozzle. According to the injection mold provided by the invention, the heat insulation sleeve and the circulating cooling system are arranged on the outer side of the hot nozzle, so that the heat on the hot nozzle can be taken away, the heat generated on the hot nozzle is prevented from being conducted to the mold, the phenomena of cracking and difficult demolding of the mold due to thermal expansion can be reduced, and the service life of the mold is prolonged.
Drawings
FIG. 1 is a cross-sectional view of a mold hot nozzle insulation apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a mold hot nozzle heat insulation device according to an embodiment of the present invention;
FIG. 3 is an enlarged view at A in FIG. 1;
FIG. 4 is a schematic structural diagram of an insulating jacket and a circulating cooling system of a hot nozzle insulating device of a mold according to an embodiment of the present invention;
in the figure: 1. a mold; 11. a cylinder plate; 12. a flow distribution plate; 13. a master template; 14. a hot runner system; 2. a hot nozzle; 3. a heat insulating sleeve; 4. a circulating cooling system; 41. a flow guide pipe; 42. a cooling tube; 5. pressing a plate; 6. a convex ring; 7. a screw; 8. a seal ring; 9. and (5) producing the product.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The first embodiment is as follows:
the invention provides a heat insulation device comprising a hot nozzle of a mold, and referring to fig. 1-4, the heat insulation device comprises a heat insulation sleeve 3 and a circulating cooling system 4, the heat insulation sleeve 3 is fixed in the mold 1, the mold 1 comprises a cylinder plate 11, a flow distribution plate 12 and a mother template 13 which are sequentially arranged from top to bottom, a hot runner system 14 is arranged on the flow distribution plate 12, and the hot runner system 14 is used for heating the hot nozzle 2. The height of the heat insulation sleeve 3 is lower than that of the hot nozzle 2 so as to increase the area of heat exchange between cooling water and the hot nozzle 2, meanwhile, the heat insulation sleeve 3 does not obstruct the hot nozzle 2 to normally work, and the heat insulation sleeve 3 is sleeved on the periphery of the hot nozzle 2. The circulating cooling system 4 comprises a guide pipe 41 and a cooling pipe 42, the cooling pipe 42 is arranged in the heat insulation sleeve 3, and the cooling pipe 42 is communicated with an external cooling liquid circulating system through the guide pipe 41. The flow guide pipe 41 comprises a water inlet flow guide pipe and a water outlet flow guide pipe, and the water inlet flow guide pipe and the water outlet flow guide pipe are respectively arranged on two sides of the hot nozzle 2.
When the hot nozzle 2 needs to be cooled, only the cooling water is injected into the water inlet flow guide pipe, and accordingly the cooling water flowing into the water inlet flow guide pipe flows to the water outlet flow guide pipe through the cooling pipe 42, and the heat generated by the hot nozzle 2 can be taken away. That is to say, after cooling water poured into cooling tube 42, cooling water surrounded hot nozzle 2 wholly, then cooling water discharged the cooling water that has the heat degree through going out the water honeycomb duct and discharged outside coolant circulation system in for hot nozzle 2 cooling effect is obvious, avoids on conducting the mould 1 with the heat that produces on hot nozzle 2, thereby can reduce mould 1 and lead to the phenomenon of fracture and drawing of patterns difficulty because of the thermal expansion, improves the accuracy of mould 1.
Preferably, the caliber of the cooling pipe 42 is gradually increased along the injection molding flow direction of the hot nozzle 2, that is, the upper caliber of the cooling pipe 42 is smaller than the lower caliber of the cooling pipe 42, in addition, the end of the cooling pipe 42 is provided with an inclined part, the cooling pipe 42 can form a resistance difference inside the heat insulation sleeve 3 by utilizing the distance difference between the inclined part and the opening end of the cooling pipe 42, so that the upper resistance inside the cooling pipe 42 is larger than the lower resistance of the cooling pipe 42, thereby the cooling water can automatically circulate and flow in the cooling pipe 42 to take away the heat on the hot nozzle 2, the heat generated on the hot nozzle 2 is prevented from being conducted to the mold 1, the phenomena of thermal expansion cracking and demolding difficulty of the mold 1 can be reduced, and the service life of the mold 1 is prolonged. However, it should be understood that the shape of the cooling tube 42 according to the present invention is not limited thereto, for example, the sizes of the upper and lower apertures of the cooling tube 42 may be consistent, and the size of the upper aperture of the cooling tube 42 may be larger than the size of the lower aperture of the cooling tube 42, as long as the cooling water can circulate in the cooling tube 42 to take away the heat generated by the hot nozzle 2.
In order to firmly connect the heat insulation sleeve 3 to the mold 1, the heat insulation device with the hot nozzle 2 of the mold 1 further comprises a pressing plate 5 fixedly connected with the mold 1, a convex ring 6 is arranged on the heat insulation sleeve 3, the size of the convex ring 6 can be distributed according to the size of the heat insulation sleeve 3, the pressing plate 5 is pressed on the convex ring 6, and the pressing plate 5 fixedly connects the convex ring 6 with the mold 1 through a screw 7 so as to realize the fixed connection of the heat insulation sleeve 3 and the mold 1. Of course, the person skilled in the art can also fixedly attach the insulating sleeve 3 to the mould 1 in other ways, for example by gluing the insulating sleeve 3 to the mould 1 with an adhesive glue. In order to prevent the liquid leakage of the flow guide pipe 41, a sealing ring 8 is further arranged at the joint of the heat insulation sleeve 3 and the mold 1, and the size and the thickness of the sealing ring 8 can be set according to the size of the flow guide pipe 41. It should be noted that the sealing ring 8 is a high temperature resistant sealing ring 8, and the minimum heat resistant temperature of the sealing ring 8 is 250 ℃.
Example two:
the invention also provides an injection mold 1, which comprises the mold hot nozzle heat insulation device in the first embodiment, referring to fig. 1 and fig. 2. It should be noted that the runner structure of heater strip is laid for inside to hot mouth 2, specifically, the inside heater strip that is covered with of hot mouth 2, when hot runner system 14 carries out heat treatment to hot mouth 2, hot mouth 2 can rapid heating up, and hot mouth 2 after the heating can melt plastic particle for the plastic liquid after melting can flow to cavity die benevolence through hot mouth 2 bottom, finally makes product 9.
When hot mouth 2 high temperature, on the heat conduction of hot mouth 2 was easily done mould 1, caused mould 1 to produce the thermal expansion, and then made mould 1 thermal expansion fracture, phenomenons such as the drawing of patterns difficulty also appear easily in the product 9 that makes. Therefore, in the mold 1 requiring the hot runner system 14, the precision of the mold 1 is affected in order to reduce the heat conduction from the hot nozzle 2 to the mold 1.
According to the invention, the heat insulation sleeve 3 is sleeved on the periphery of the hot nozzle 2, the heat insulation sleeve 3 and the circulating cooling system 4 are arranged on the outer side of the hot nozzle 2, so that heat on the hot nozzle 2 can be taken away, meanwhile, the pressing plate 5 fixedly connected with the female die plate 13 presses the convex ring 6 of the heat insulation sleeve 3, correspondingly, the pressing plate 5 of the heat insulation sleeve 3 is fixed on the flow distribution plate 12 by the screw 7, namely, the pressing plate 5 fixedly connected with the female die plate 13 is fixedly connected with the die 1 by the screw 7, so that the heat insulation sleeve 3 is fixedly connected with the die 1. Through design honeycomb duct 41 that can business turn over water on flow distribution plate 12, pour into the cooling tube 42 in the radiation shield 3 with cooling water, make cooling water can be at cooling tube 42 internal circulation flow, take away the heat on hot mouth 2, avoid with the heat conduction that produces on the hot mouth 2 to mould 1 on to can reduce mould 1 because of the phenomenon that the thermal expansion leads to fracture and drawing of patterns difficulty, improve mould 1's life.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A mold hot nozzle heat insulation device is characterized by comprising a heat insulation sleeve and a circulating cooling system, wherein the heat insulation sleeve is fixed in a mold and sleeved on the periphery of a hot nozzle; the circulating cooling system comprises a flow guide pipe and a cooling pipe; the cooling pipe is arranged in the heat insulation sleeve and is communicated with an external cooling liquid circulating system through a guide pipe.
2. The mold hot nozzle heat insulation device according to claim 1, further comprising a pressing plate fixedly connected with the mold, wherein the heat insulation sleeve is provided with a convex ring, and the pressing plate is pressed on the convex ring to fixedly connect the heat insulation sleeve and the mold.
3. The mold hot nozzle insulation apparatus of claim 2, wherein the pressure plate is secured to the mold by screws.
4. The mold hot nozzle insulation device of claim 1, wherein the cooling tube has a diameter that gradually increases in the direction of injection flow of the hot nozzle.
5. The mold hot nozzle insulation as in claim 4, wherein said cooling tube terminates in an inclined portion.
6. The mold hot nozzle heat insulation device as claimed in claim 1, wherein a sealing ring for preventing liquid leakage of the flow guide pipe is provided at the joint of the heat insulation sleeve and the mold.
7. An injection mold comprising the mold hot nozzle insulation of any one of claims 1 to 6.
8. An injection mold as claimed in claim 7, wherein the hot nozzle is a runner structure having a heating wire disposed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641697.2A CN112721060A (en) | 2020-12-31 | 2020-12-31 | Hot mouth heat insulation device of mould and injection mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641697.2A CN112721060A (en) | 2020-12-31 | 2020-12-31 | Hot mouth heat insulation device of mould and injection mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112721060A true CN112721060A (en) | 2021-04-30 |
Family
ID=75609331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011641697.2A Pending CN112721060A (en) | 2020-12-31 | 2020-12-31 | Hot mouth heat insulation device of mould and injection mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112721060A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589895A (en) * | 2022-05-10 | 2022-06-07 | 扬昕科技(苏州)有限公司 | Mold cooling device |
-
2020
- 2020-12-31 CN CN202011641697.2A patent/CN112721060A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589895A (en) * | 2022-05-10 | 2022-06-07 | 扬昕科技(苏州)有限公司 | Mold cooling device |
| CN114589895B (en) * | 2022-05-10 | 2022-09-09 | 扬昕科技(苏州)有限公司 | Mold cooling device |
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