CN208452191U - It is a kind of passively to move back type core type layering injection molding - Google Patents
It is a kind of passively to move back type core type layering injection molding Download PDFInfo
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- CN208452191U CN208452191U CN201820962444.7U CN201820962444U CN208452191U CN 208452191 U CN208452191 U CN 208452191U CN 201820962444 U CN201820962444 U CN 201820962444U CN 208452191 U CN208452191 U CN 208452191U
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- piston
- atmospheric pressure
- pressure pole
- mold cavity
- injection molding
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 32
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 229920003023 plastic Polymers 0.000 description 10
- 239000004033 plastic Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000000465 moulding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 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
- 125000003003 spiro group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Type core type layering injection molding is passively moved back the utility model proposes a kind of, piston is formed by dynamic model, cover half, piston, atmospheric pressure pole and is placed in inside mold cavity, be connected by atmospheric pressure pole with cover half, atmospheric pressure pole provides resistance, i.e. back pressure to the setback of piston.Piston is divided into outer piston and inner piston, and each piston connects an atmospheric pressure pole, i.e., outer atmospheric pressure pole and interior atmospheric pressure pole, and outer atmospheric pressure pole and interior atmospheric pressure pole can control different air pressures, thus realize layering injection.Piston is added in the utility model injection molding inside mold cavity, pushes piston motion using material, provides back pressure by piston, solve the problems, such as to short in injection moulding process；The problem of originally being closed by piston inside mold cavity, blocking when material enters mold cavity by piston, avoiding the injection of injection initial stage material；Material needs to push piston motion when flowing in mold cavity, because piston has back pressure, forces material to move along piston motion direction, ensure that steady flow of the material in mold cavity.
Description
Technical field
The present invention relates to mold manufactures, are suitable for large scale cross-section plastic part injection molding technique, belong to industrial design
Field.
Background technique
In recent years, with plastic shaping industrial expansion, the demand of large scale plastic part product is more and more vigorous, and injection is made
For a kind of efficient plastics molding process, it is widely used.Injection process is mainly injector spiro rod plasticizing fusant
Expect and by material injection into mold cavity and then the process of curing molding.During injection moulding, inject different material with
And when the different sizes of injection moulding, product of different shapes, the requirement to mold also differs widely.Such as in molding large scale light
When learning plastic products, in order to realize its optical property, needing to solve product, internal stress is big in forming process and is unevenly distributed, is cold
The problems such as shrinking big, internal flow confusion, shorting.The presence of these problems restricts the hair of injection moulding large scale plastic products
Exhibition.
In order to solve these problems, domestic and foreign scholars probe into out some solutions.(big vast little Ying is thick by the Hong little Ying in China
Injection technique control technology [J] New Technologies that wall optical articles zero are shunk, 2014 (9): 80-83.) by repeatedly trying
The cure shrinkage line for drawing out product is tested, zero contraction of large scale thick-walled product is realized by way of compensating material.It is German sub-
Ch.Hopmann (Ch.Hopmann, Neuss A, Weber M, et the al.Multilayer injection of treasure polytechnical university
moulding of thick-walled optical plastics parts[C].International Conference
of the Polymer-processing-society.American Institute of Physics,2014:146-
Et al. 149.) devise the mode of multi-player injection to solve the problems, such as that heavy wall is injected, multi-player injection be improve it is traditional double-colored
Injection, layering injection, preformed layer and rear shape layer are produced using identical material.Since multilayer plastic articles are gradually to divide
Layer is injection molding, and each layer of thickness is thinner much than final molding product, and this injection molding can shorten
It the total production cycle for injecting finished product, promotes the surface quality of product, reduces warpage, the problems such as internal stress is uneven.
Above two scheme can realize the injection moulding of large scale plastic products, but all have the defects that certain.
In the scheme of Hong little Ying, product cure shrinkage curve is drawn using test of many times, it is solid to be only able to solve large scale plastic part
Change and shrink big problem, and test of many times also increases the formed product period, improves production cost.Ch.Hopmann's
In multi-player injection scheme, interface cohesion is the largest problem, this requires to have in injection process accurately technological parameter want
It asks, and very high to the required precision of injector and mold, it is difficult to realize large-scale industrialization at production.
Simple flow, shortening forming time, reducing production cost is always what industrialized production was pursued, by being optimized to
Type technique, the existing equipment of improvement carry out cost of implementation optimization.
Summary of the invention
In view of the above problems, the present invention proposes that a kind of novel core type of passively moving back is layered injection molding, propose in mold
The intracavitary addition piston of type and atmospheric pressure pole.Piston initially closes the type chamber of mold, and in injection process, material fills mould type
Chamber, resistance of the material by piston form back pressure, force material filling completely and steady flow.It is possible thereby to greatly avoid
The generation shorted.And be layered by piston, the atmospheric pressure pole of different model is connected, the function of layering injection may be implemented.Piston
Back pressure is provided by atmospheric pressure pole.Piston, atmospheric pressure pole are detachable, and total can be according to different materials, different injection items
Part is adjusted.Such as atmospheric pressure pole air pressure numerical values recited and whether be that constant force can be adjusted.Piston can with multi-tier arrangement,
Different back pressures is provided by different model atmospheric pressure pole, to realize layering injection.
To realize above-mentioned function, The technical solution adopted by the invention is as follows: a kind of core type layering injection mold of passively moving back is signed an undertaking
Structure is formed piston and is placed in inside mold cavity by dynamic model, cover half, piston, atmospheric pressure pole, is connected by atmospheric pressure pole with cover half, air pressure
Bar provides resistance, i.e. back pressure to the setback of piston.Piston is divided into outer piston and inner piston, and each piston connects an air pressure
Bar, i.e., outer atmospheric pressure pole and interior atmospheric pressure pole, outer atmospheric pressure pole and interior atmospheric pressure pole can control different air pressures, thus realize layering note
It penetrates.
Dynamic model and cover half are made by mould steel, mould steel selection carbon tool steel, and carbon tool steel carbon content 0.65%~
1.35%, have many advantages, such as it is cheap, be easy to forge, machinability it is good.Piston is made of brass, and brassiness is soft, can be with
It avoids that type cavity wall is caused to damage.Atmospheric pressure pole is customization part, plays the role of slowly ejecting product when providing back pressure and die sinking.
A kind of core type of passively moving back of the present invention is layered injection molding, and piston can be made into multilayer, each layer of company
An atmospheric pressure pole is connect, the back pressure that atmospheric pressure pole provides is different, thus multilayer layering injection may be implemented.Since piston is in atmospheric pressure pole
Back pressure effect under move, thus be referred to as passively move back core type layering injection.
A kind of core type of passively moving back of the present invention is layered injection molding, and the atmospheric pressure pole is one kind using gas as work
The elastic element of medium, internal filled with high pressure nitrogen, elastic force can be straight by the way that different nitrogen pressure or difference is arranged
The piston rod of diameter is adjusted, the elastic curve with near-linear.
A kind of core type of passively moving back of the invention is layered injection molding, advantage and effect are as follows:
(1) piston is added inside mold cavity, pushes piston motion using material, piston provides back pressure, solves note
The problem of being shorted during modeling.
(2) it is originally closed by piston inside mold cavity, blocking when material enters mold cavity by piston,
The problem of avoiding the injection of injection initial stage material.
(3) it needs to push piston motion when material flows in mold cavity, piston provides back pressure, forces material along piston
Direction of motion movement, ensure that steady flow of the material in mold cavity.The air pressure rod structure of use is simple, and replacement is convenient,
Seriation easy to accomplish.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for passively moving back core type layering injection molding of the invention.
In figure: 1- cover half, 2- dynamic model, 3- outer layer piston, 4- internal layer piston, the outer atmospheric pressure pole of 5-, atmospheric pressure pole in 6-.
Specific embodiment
As shown in Figure 1, a kind of passively move back core type layering injection mould structure, by cover half 1, dynamic model 2, outer layer piston 3, internal layer
Piston 4, outer atmospheric pressure pole 5 and interior atmospheric pressure pole 6 are constituted, and outer layer piston 3 and internal layer piston 4 are placed in inside mold cavity, rely on respectively
Outer atmospheric pressure pole 5 is connected with interior atmospheric pressure pole 6 with cover half 1, and outer atmospheric pressure pole 5 and interior atmospheric pressure pole 6 are respectively to outer layer piston 3 and internal layer piston
4 setback provides resistance.
The gap in outer layer piston 3 and internal layer piston 4 and the intracavitary portion of type is less than the flash value of material, to avoid injecting
The spilling of material in the process.
In injection process, initial stage cover half 1 and dynamic model 2 are molded, and outer layer piston 3 and internal layer piston 4 rely on outer air pressure respectively
The elastic force that bar 5 and interior atmospheric pressure pole 6 provide moves to type chamber front, at this time piston with cavity wall will there are certain intervals, in this way
Material could be made further to push second layer piston motion.When the pressure value of interior atmospheric pressure pole 6 is less than outer atmospheric pressure pole 5, material
Internal layer piston 4 will be pushed to move backward first, due to atmospheric pressure pole 6 in connecting after internal layer piston 4, so internal layer piston 4 can be given
Material provides certain back pressure.Material by back pressure, avoid material spray, short, insufficient fill the problems such as, and material by
To 4 back pressure of internal layer piston, the flowing of material is stabilized.When internal layer piston 4 is pushed to end of travel by material, then material starts
Outer layer piston 3 is pushed, stops injection until outer layer piston 3 is pushed to end of travel, then carries out pressure maintaining, opened after material solidification
Mould is completed entirely to move back core layering injection process.
Claims (4)
1. a kind of passively move back type core type layering injection molding, it is characterised in that: it is made of dynamic model, cover half, piston, atmospheric pressure pole, it is living
It plugs inside mold cavity, is connected by atmospheric pressure pole with cover half, atmospheric pressure pole provides resistance, piston point to the setback of piston
For outer piston and inner piston, outer piston and inner piston are separately connected outer atmospheric pressure pole and interior atmospheric pressure pole, outer atmospheric pressure pole and interior atmospheric pressure pole
It can control different air pressures, thus realize layering injection.
A kind of passively move back type core type layering injection molding 2. according to claim 1, it is characterised in that: dynamic model and cover half by
Mould steel production, piston are made of brass.
3. a kind of type core type of passively moving back according to claim 1 is layered injection molding, it is characterised in that: piston can divide multilayer
Production, every layer of piston are all connect with different model atmospheric pressure pole.
4. a kind of type core type of passively moving back according to claim 1 is layered injection molding, it is characterised in that: atmospheric pressure pole is a kind of
Using gas as the elastic element of working media, internal filled with high pressure nitrogen, elastic force can be by being arranged different nitrogen pressures
The piston rod of power or different-diameter is adjusted, the elastic curve with near-linear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820962444.7U CN208452191U (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back type core type layering injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820962444.7U CN208452191U (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back type core type layering injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208452191U true CN208452191U (en) | 2019-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820962444.7U Expired - Fee Related CN208452191U (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back type core type layering injection molding |
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| CN (1) | CN208452191U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108673844A (en) * | 2018-06-22 | 2018-10-19 | 北京化工大学 | It is a kind of passively to move back core formula layering injection molding |
-
2018
- 2018-06-22 CN CN201820962444.7U patent/CN208452191U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108673844A (en) * | 2018-06-22 | 2018-10-19 | 北京化工大学 | It is a kind of passively to move back core formula layering injection molding |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190201 |