CN108673844A - It is a kind of passively to move back core formula layering injection molding - Google Patents
It is a kind of passively to move back core formula layering injection molding Download PDFInfo
- Publication number
- CN108673844A CN108673844A CN201810646944.4A CN201810646944A CN108673844A CN 108673844 A CN108673844 A CN 108673844A CN 201810646944 A CN201810646944 A CN 201810646944A CN 108673844 A CN108673844 A CN 108673844A
- Authority
- CN
- China
- Prior art keywords
- piston
- atmospheric pressure
- pressure pole
- mold cavity
- injection molding
- 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.)
- Pending
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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
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
- B29C45/332—Mountings or guides therefor; Drives 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/563—Enlarging the mould cavity during injection
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention proposes that a kind of core formula of passively moving back is layered injection molding, is formed piston by dynamic model, cover half, piston, atmospheric pressure pole and is placed in inside mold cavity, is connected with cover half by atmospheric pressure pole, atmospheric pressure pole provides resistance, i.e. back pressure to the setback of piston.Piston is divided into outer piston and inner carrier, 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 injection molding of the present invention inside mold cavity, pushes piston motion using material, provides back pressure by piston, solve the problems, such as to short in injection moulding process；It is originally closed by piston inside mold cavity, material is stopped when entering mold cavity by piston, and the problem of injection initial stage material sprays is avoided；Material needs to push piston motion when flowing in mold cavity, because piston has back pressure, forces material to be moved along piston motion direction, ensure that steady flow of the material in mold cavity.
Description
Technical field
The present invention relates to mold manufacturings, are suitable for large scale cross-section plastic part injection molding technique, belong to industrial design
Field.
Background technology
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 the process by material injection into mold cavity and then curing molding.During injection moulding, injection 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 solution 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 are 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 aftershaping 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 there is certain defect.
In the scheme of Hong little Ying, product cure shrinkage curve is drawn using test of many times, it is solid can only 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, it is always what industrialized production was pursued to reduce production cost, by being optimized to
Type technique, the existing equipment of improvement carry out cost of implementation optimization.
Invention content
In view of the above problems, the present invention proposes that a kind of novel passive core type of moving back is layered injection molding, propose in mold
Piston and atmospheric pressure pole are added in cavity.Piston initially closes the cavity of mold, and in injection process, material fills mould type
Chamber, material are formed back pressure by the resistance of piston, 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 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 that above-mentioned function, the technical solution adopted by the present invention are as follows：One kind passively moving back core type layering injection mold and signs an undertaking
Structure is formed piston and is placed in inside mold cavity by dynamic model, cover half, piston, atmospheric pressure pole, is connected with cover half by atmospheric pressure pole, air pressure
Bar provides resistance, i.e. back pressure to the setback of piston.Piston is divided into outer piston and inner carrier, 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 forging, machinability it is good.Piston is made of brass, and brassiness is soft, can be with
It avoids that cavity inner 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 pressures or difference is arranged
The piston rod of diameter is adjusted, the elastic curve with near-linear.
It is of the invention a kind of passively to move back core type layering injection molding, it advantage and act as：
(1) piston is added inside mold cavity, pushes piston motion, piston to provide back pressure, solve note using material
The problem of being shorted during modeling.
(2) it is originally closed by piston inside mold cavity, material is stopped when entering mold cavity by piston,
The problem of avoiding the injection of injection initial stage material.
(3) it needs that piston motion, piston is pushed to provide back pressure, force material along piston when material flows in mold cavity
The direction of motion moves, and ensure that steady flow of the material in mold cavity.The atmospheric pressure pole of use is simple in structure, and it is convenient to replace,
Seriation easy to implement.
Description of the drawings
Fig. 1 is a kind of passive structural schematic diagram for moving back core type layering injection molding of the present invention.
In figure：1- cover half, 2- dynamic models, 3- outer layer pistons, 4- internal layer pistons, the outer atmospheric pressure poles of 5-, atmospheric pressure pole in 6-.
Specific implementation mode
As shown in Figure 1, a kind of passively moving 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.
Outer layer piston 3 and internal layer piston 4 are less than the flash value of material with the gap inside cavity, to avoid injecting
The spilling of material in the process.
In injection process, initial stage cover half 1 is molded with dynamic model 2, 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 cavity 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 being connected 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 pressurize, opened after material solidification
Mould is completed entirely to move back core layering injection process.
Claims (4)
1. a kind of passively moving back core formula 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 with cover half by atmospheric pressure pole, atmospheric pressure pole provides resistance, piston point to the setback of piston
For outer piston and inner carrier, outer piston and inner carrier are separately connected outer atmospheric pressure pole and interior atmospheric pressure pole, outer atmospheric pressure pole and interior atmospheric pressure pole
Different air pressures can be controlled, thus realizes layering injection.
2. a kind of core formula of passively moving back according to claim 1 is layered injection molding, it is characterised in that：Dynamic model and cover half by
Mould steel makes, and piston is made of brass.
3. a kind of core formula of passively moving back according to claim 1 is layered injection molding, it is characterised in that：Piston can divide multilayer
It makes, every layer of piston is all connect with different model atmospheric pressure pole.
4. a kind of core formula 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 |
|---|---|---|---|
| CN201810646944.4A CN108673844A (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back core formula layering injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810646944.4A CN108673844A (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back core formula layering injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108673844A true CN108673844A (en) | 2018-10-19 |
Family
ID=63811975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810646944.4A Pending CN108673844A (en) | 2018-06-22 | 2018-06-22 | It is a kind of passively to move back core formula layering injection molding |
Country Status (1)
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|---|---|
| CN (1) | CN108673844A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807059A (en) * | 2005-01-17 | 2006-07-26 | 北京中拓机械有限责任公司 | Forming method of hollow plastic product and related apparatus |
| CN201833563U (en) * | 2010-07-09 | 2011-05-18 | 华南理工大学 | Screwless plastic disk-type rotary injection device |
| CN202439178U (en) * | 2012-02-15 | 2012-09-19 | 河北华强科技开发有限公司 | Plastic modified device |
| CN208452191U (en) * | 2018-06-22 | 2019-02-01 | 北京化工大学 | It is a kind of passively to move back type core type layering injection molding |
-
2018
- 2018-06-22 CN CN201810646944.4A patent/CN108673844A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807059A (en) * | 2005-01-17 | 2006-07-26 | 北京中拓机械有限责任公司 | Forming method of hollow plastic product and related apparatus |
| CN201833563U (en) * | 2010-07-09 | 2011-05-18 | 华南理工大学 | Screwless plastic disk-type rotary injection device |
| CN202439178U (en) * | 2012-02-15 | 2012-09-19 | 河北华强科技开发有限公司 | Plastic modified device |
| CN208452191U (en) * | 2018-06-22 | 2019-02-01 | 北京化工大学 | It is a kind of passively to move back type core type layering injection molding |
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