CN110103411A - A kind of multiple injection molding die and the injection moulding method using the mold - Google Patents
A kind of multiple injection molding die and the injection moulding method using the mold Download PDFInfo
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- CN110103411A CN110103411A CN201910336647.4A CN201910336647A CN110103411A CN 110103411 A CN110103411 A CN 110103411A CN 201910336647 A CN201910336647 A CN 201910336647A CN 110103411 A CN110103411 A CN 110103411A
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- Prior art keywords
- injection
- mold
- molding die
- injection molding
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Classifications
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- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- 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
- B29C45/2602—Mould construction elements
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 is a kind of multiple injection molding die and the injection moulding method using the mold, the mold is not the quantity by expanding dynamic model mold core or injection flow passage, but the gear set of external hydraulic motor driving mold is used strictly to press certain gear ratio rotation, it drives the ejector half mold core (4) in movable model chamber (3) to realize by lead screw (10) again to move forward or back, indirectly control mold cavity size, i.e. mold realizes the quantitative control to dynamic mould core (4) displacement by the turnning circle of gear drive adjustment gear group, therefore the injection moulding of ultra-thick product can be decomposed into the injection moulding for the thin-walled blank that any number of thickness accurately control, to the ununiform shrinkage for avoiding one injection from generating when forming heavy wall product, warpage, the defects of vacuum bubbles and big residual stress.
Description
Technical field
The present invention is a kind of multiple injection molding die and the injection moulding method using the mold, belongs to injection moulding skill
Art field.
Background technique
The application field of ultra-thick (50~300mm) plastic items is more and more extensive, leads from traditional petrochemical industry
Domain such as pressure piping, gradually expands to the fields such as aerospace, deep-sea detecting, such as ultra-thick observation window etc..But often
Rule injection molding technology is generally only suitable for the plastic products of 1~6mm of molding, according to the manufacture heavy wall modeling of regular injection forming technique
When expecting components, since the plastic melt surface contacted when molding with mold and core have very big temperature gradient, easily produce
The open defects such as raw ununiform shrinkage, warpage, current mark, vacuum bubbles, at the same will lead to that residual stress is big and mechanical property it is each to
The disadvantages of anisotropic, can not mold the components of high quality.Furthermore the injection moulding period is long, higher cost, so using conventional
Injecting method is difficult to form ultra-thick product.
The development of multiple injection forming technique in recent years provides one kind for the manufacture of this ultra-thick plastic items
Completely new thinking.The core of multiple injection forming technique is that a system is formed using process of injection molding twice or more than twice
Product, the above one injection moulded blank is injection moulded as substrate when injecting each time, is combined as a whole by heat fusing,
To convert the injection moulding of thick-wall part to the injection moulding of multiple thin wall parts.Multiple injection molding die is to realize to be somebody's turn to do
The key of technology.Multiple injection molding often need to be just able to achieve by multiple injection molding machine with the mold with special construction.
Currently, multiple injection forming die structure is complicated, and multiple injecting units is needed just to be able to achieve.Typical mold knot
Structure is to determine model cavity in same set of mould bases for one and correspond to multiple and different movable model chambers, the product cavity injected each time
Product need to be greater than last mold cavity volume, and mold is furnished with rotatable or other convertible dynamic model positions mechanism, multiple to complete
Injection.
Patent CN101422951B discloses a kind of injecting molding die of plastic double-layer product, and mold is on moving template
Two sets dynamic model mold cores and a linear type sliding rail be set, the cavity dimension that two sets of dynamic model mold cores are wherein a set of and cover half cooperatively forms
Greater than the cavity dimension that another set of dynamic model and cover half cooperatively form, moving template may make to do on the slide rail back and forth by driving device
Movement successively realizes that Double colour double-deck is injected with cover half molding.The mold can realize that double injection forms in one set of die, system
Produce the product with double-layer structure, but can not form the number of plies is more, frequency injection more than dynamic model mold core quantity, thickness it is bigger
Product.
Patent CN105345996A discloses a kind of more molding molds of melt multiple injection, and mold is by being located at cover half
It is combined into first time injection flow passage, second of injection flow passage, second of injecting systems positioning plate and the mold cavity component of dynamic model side
More melt multiple injection molding dies, the process of plastic melt successively sequential injection can be completed without the use of double-shot moulding
Machine.But the mold carries out double injection molding indeed through two injection flow passages, and per injection is respectively filled with the one of type chamber
Half or a part of, it cannot achieve product that frequency injection is more than injection flow passage number, that thickness is bigger.
Patent CN107738409A discloses a kind of precision die of single melt multiple injection.Mold uses external drive
The mold insert guide rail completion of mold indirectly controls mold cavity change in size, while can cut off single melt equipped with cast gate device for excising
The cold cast gate of body single injection, to guarantee that runner is unimpeded when injecting next time.But the position of the mold insert adjustable plate of the mold is difficult
Accurately to control, therefore injection moulding amount and thickness can not be precisely controlled each time；The length limitation stroke of guide rail simultaneously, most
Big thickness is restricted；This pouring basin device for excising is easy to appear excision not to the plastic material (such as polycarbonate) of good toughness
Smooth problem.
Above-mentioned patent or the quantity for being suitble to dynamic model mold core or injection flow passage by increasing, carry out that number is limited to be injected into
Type is limited by the structure space of mold, can not carry out the injection moulding of more numbers, can not meet ultra-thick plastic items
Requirement；Or the driving mechanism of mold cavity size is adjusted, it is unable to accurately control injection volume each time, plastic items are most
Big thickness is also restrained.
Summary of the invention
The present invention is exactly directed to above-mentioned problems of the prior art and designs and provide a kind of multiple injection shaping mould
The injection moulding method of tool and the application mold, the purpose is to realize that heavy wall is the shaped article of the multiple injection of 50~300mm.
The present invention is achieved by the following technical solutions:
Technical solution of the present invention provides a kind of multiple injection molding die, it is characterised in that: in the mold, is located at cover half
The movable model chamber 3 of 2 lower sections is constituted by dynamic mould core 4 and positioned at the wedge shaped baffle 5 of 4 surrounding of dynamic mould core, the bottom of dynamic mould core 4
It is supported by a supporting mechanism, the bottom plate 8 of the supporting mechanism is connected to the top for the lead screw 10 being disposed vertically, which passes through
Gear set drive rotation axially upwards or is moved downward along it to drive dynamic mould core 4 to transport upward or downward in movable model chamber 3
It is dynamic；
The two sides of cover half 2 are provided with oil cylinder 11, piston is connected with push plate 12, and push plate 12 is connected with four vertically downward
Push rod 15, push rod 15 passes through 2 shell of cover half intracavitary and be located at and determine four angular positions of model cavity, the oil cylinder 11 that protrudes into cover half type
It supplies power to push plate 12 and push rod 15 is driven to push down on injection moulding blank.The range of push rod 15 is not less than movable model
The range of core.
Further, in order to protect dynamic mould core not deform in forward or backward moving process, the supporting mechanism packet
Support plate 6, support column 7 and bottom plate 8 are included, enclosure space is surrounded by support plate 6 between bottom plate 8 and dynamic mould core 4, the enclosure space
Inside is equipped with support column 7 and is supported between bottom plate 8 and dynamic mould core 4, and support plate 6 and support column 7 are fixed on bottom by bolt
On plate 8.
Further, the gear set for driving lead screw 10 to rotate is external gear pump group 9, drives the motor 1 of external gear pump group 9
To can be achieved to rotate forward the hydraulic motor of reversion.Lead screw 10 and the inner ring of the gear wheel in external gear pump group 9 are threadedly engaged, motor
1 is threadedly engaged with the inner ring of the pinion gear in external gear pump group 9.
Further, it is connected between push plate 12 and push rod 15 by one piece of mounting plate 13.
Further, push plate 12 is slided along guide post 14, and guide post 14 is mounted on the top of cover half 2.
The function of push rod 15 is that last injection molding idiosome moving model core 4 is pushed to be retreated together to injecting next time
Preceding setting position, realization is directly entered in the case where mold is not opened injects next time.
According to above technical solution, the achievable molding mold of multiple injection proposed by the present invention, with announced its
His mold art solutions are different, and inventive die by expanding the quantity of dynamic model mold core or injection flow passage, is not adopted
Certain gear ratio rotation is strictly pressed with the gear set of external hydraulic motor driving mold, then movable model chamber 3 is driven by lead screw 10
Interior ejector half mold core 4, which is realized, to be moved forward or back, and mold cavity size is indirectly controlled, i.e. mold passes through gear drive adjusting tooth
The turnning circle of wheel group, therefore being injected into ultra-thick product to realize the quantitative control being displaced to dynamic mould core 4
Type is decomposed into the injection moulding for the thin-walled blank that any number of thickness accurately control, so that one injection molding heavy wall be avoided to produce
The defects of ununiform shrinkage for being generated when product, warpage, big vacuum bubbles and residual stress；The oil cylinder 11 of mold is located at 2 side of cover half
Face is designed and is injected into glue in conjunction with existing mould gate design and Hot runner Technology at present, such as product edge side gate
Runner uses needle valve type hot runner, then is injection moulded after the completion of the period each time, does not need taking-up injection moulding blank excision and pours
Mouthful, but band side gate is directly ejected using push rod 15 and is injection moulded blank, so that after moulded blank is with dynamic model mold core 4
It moves back as injection molding substrate next time, this avoid injection moulding blanks to be exposed to outside, is conducive to double injection molding
Fusion between blank, while excision cast gate process is eliminated, save cost.
Furthermore the quantity of inventive die dynamic model mold core 4 and injection flow passage is identical as normal injection mold, and entire injection
Dynamic model and cover half have been at molding state in forming process, therefore use common single screw rod injection forming equipment, are not required to
Want the special molding equipment with multiple injecting units.Therefore multiple injection molding die proposed by the present invention and injection are used
The performance of product can be improved in method, reduces the cost of product, mold and equipment.
Detailed description of the invention
Fig. 1 is the overall structure diagram of multiple injection molding die of the present invention；
Fig. 2 is the structure sectional view of supporting mechanism in Fig. 1；
Fig. 3 is the structural schematic diagram of Fig. 1 middle gear transmission；
Fig. 4 is the structural schematic diagram of pusher portion in Fig. 1.
In figure: 1, hydraulic motor；2, cover half；3, dynamic model；4, dynamic mould core；5, wedge shaped baffle；6, support plate；7, it supports
Column；8, bottom plate；9, external gear pump group；10, lead screw；11, oil cylinder；12, push plate；13, fixed plate；14, guide post；15, push rod.
Specific embodiment
1~Fig. 4 and the present invention is further elaborated by specific embodiment with reference to the accompanying drawing, wherein embodiment has
Characteristic is described, is not restrictive, this does not limit the scope of protection of the present invention.
Fig. 1 is a kind of overall structure diagram of multiple injection molding die of the invention, shows gear drive in figure
Motor 1 in mechanism, cover half 2, dynamic model and actuation are in the phase position of the oil cylinder 11 of push rod 15.
Fig. 2-4 is type chamber (containing supporting mechanism), gear drive and the push rod of multiple injection molding die of the invention
The schematic diagram of mechanism, furthermore the present embodiment pays close attention to the part of the realization of melt multiple injection function involved in inventive die,
It is omitted and is associated with untight other parts with the present invention.As shown, type chamber includes cover half 2 and movable model chamber 3, wherein cover half
2 are made of fixed mold, and movable model chamber 3 is made of dynamic mould core 4 and wedge shaped baffle 5, and wedge shaped baffle 5 is located at dynamic mould core 4
Surrounding.4 bottom surface of dynamic mould core is connected through a screw thread with support plate 6 and support column 7, and support plate 6 and support column 7 are fixed on bottom plate 8
On.Bottom plate 8 is connected with the lead screw 10 in gear drive.The gear big with the number of teeth in external gear pump group 9 of lead screw 10
Inner ring be threadedly engaged, the pinion gear in external gear pump group 9 is connect with hydraulic motor 1.Determine on model cavity 2 equipped with push rod machine
Structure, transfer bar mechanism supply power to push plate 12 by oil cylinder 11, and push plate 12 is connect with push rod 15 by mounting plate 13, and push rod 15 has 4,
It is located at the quadrangle for determining model cavity 2.Entire transfer bar mechanism can be slided along guide post 14.
Multiple injection molding die of the invention, the process of injection molding in injector are achieved in that
Mold is mounted on injection (mo(u)lding) machine first.Select the normal injection machine with single injecting unit that can meet
Product molding requirement.Cover half equipped with transfer bar mechanism is mounted on the fixed form of injector, directly with the nozzle of injector or
Sprue bush contact；Dynamic model equipped with gear drive and cavities bear mechanism, is mounted on the moving die plate of injector
Before injection moulding, according to the thickness d of product, the thickness d for designing frequency injection n, being injection moulded green body each timeiWith
And corresponding dynamic model mold core moving distance si, according to the thread parameter of gear ratio and screw rod between external gear pump group gear,
The revolution of per injection period corresponding gear revolution and hydraulic motor is calculated, see Table 1 for details；
Table 1
Cover half 2 and movable model chamber 3 mold, and start to be injection moulded.Start hydraulic motor 1, it is ensured that gear set 9 is rotated up to pre-
Fixed circle number, lead screw 8 drive dynamic model mold core 4 to reach preset position, start to inject for the first time, pressure maintaining and a cooling timing
Between, the oil cylinder 11 on cover half 2 provides powered push plate 12 and the ejection injection idiosome of push rod 15, so that molding idiosome is servo-actuated mould mould
Core 4 retreats together, and push rod 15 retracts to original position before molding next time starts, and the injection moulding period completes for the first time.
According to the corresponding thickness d i of per injection and corresponding dynamic model mold core moving distance si, the above one injection idiosome is made
For substrate, above step is repeated, until completing scheduled frequency injection n.
In above-mentioned n times process of injection molding, cover half 2 and dynamic model 3 have been at closed state, until frequency injection is all complete
Cheng Hou, cover half 2 and dynamic model 3 are opened, and opposite direction starts hydraulic motor 1, and dynamic model mold core 4 advances, and eject shaped article.
Basic structure and working principle of the invention has been shown and described above.Need exist for it is clear that, although
To the present invention have been described in detail, but it is directed to the relevant staff of this field, that makes on the basis of the present invention is any
Similar modification all should belong to protection scope of the present invention.
Claims (8)
1. a kind of multiple injection molding die, it is characterised in that: in the mold, be located at cover half (2) below movable model chamber (3) by
Dynamic mould core (4) and the wedge shaped baffle (5) for being located at dynamic mould core (4) surrounding are constituted, and the bottom of dynamic mould core (4) is supported by one
Mechanism supports, the bottom plate (8) of the supporting mechanism are connected to the top for the lead screw (10) being disposed vertically, which passes through gear
Group drive rotation axially upwards or is moved downward along it to drive dynamic mould core (4) to transport upward or downward in movable model chamber (3)
It is dynamic；
The two sides of cover half (2) are provided with oil cylinder (11), piston is connected with push plate (12), and push plate (12) is connected with four vertically
Downward push rod (15), push rod (15) passes through cover half (2) shell, and to protrude into cover half type intracavitary and be located at four angles for determine model cavity
Place is set, oil cylinder (11) supplies power to push plate (12) and push rod (15) is driven to push down on injection moulding blank.
2. multiple injection molding die according to claim 1, it is characterised in that: the supporting mechanism includes support plate
(6), support column (7) and bottom plate (8), surround enclosure space by support plate (6) between bottom plate (8) and dynamic mould core (4), the closing
Space interior is equipped with support column (7) and is supported between bottom plate (8) and dynamic mould core (4), and support plate (6) and support column (7) are equal
It is bolted on bottom plate (8).
3. multiple injection molding die according to claim 1, it is characterised in that: drive the gear set of lead screw (10) rotation
For external gear pump group (9), driving the motor (1) of external gear pump group (9) is the hydraulic motor that can be achieved to rotate forward reversion.
4. multiple injection molding die according to claim 3, it is characterised in that: lead screw (10) and external gear pump group
(9) inner ring of the gear wheel in is threadedly engaged, and motor (1) and the inner ring of the pinion gear in external gear pump group (9) are threadedly engaged.
5. multiple injection molding die according to claim 1, it is characterised in that: lead between push plate (12) and push rod (15)
Cross one piece of mounting plate (13) connection.
6. multiple injection molding die according to claim 1, it is characterised in that: push plate (12) is slided along guide post (14),
Guide post (14) is mounted on the top of cover half (2).
7. carrying out the molding method of multiple injection using multiple injection molding die described in claim 1, it is characterised in that: should
The step of method, is as follows:
Step 1: determine the frequency injection needed according to the thickness of shaped article and be injection moulded the thickness of blank each time,
Calculate the turnning circle of the revolution of the corresponding lead screw of injection cycle (10) and corresponding motor (1) each time；
Step 2: dynamic model and cover half are molded；
Step 3: starting hydraulic motor, determines that the revolution of lead screw (10) reaches scheduled circle number, lead screw (10) drives dynamic model mold core
(4) after reaching preset position, start to inject for the first time, after pressure maintaining and cooling, start oil cylinder (11), push rod (15) ejection
Injection moulding blank is moved downward with dynamic model mold core (4) along movable model chamber (3), so that top is reserved next injection space, is then pushed away
Bar (15) retreats to original position, completes to be injection moulded for the first time；
Step 4: repeating the content of step 3, the above one injection moulded blank conduct according to corresponding thickness is injected next time
Substrate repeats step 3, until completing scheduled frequency injection.
Step 5: dynamic model and cover half are opened, opposite direction starts hydraulic motor (1), and dynamic model mold core (4) moves upwards, ejection molding
Product.
8. according to claim 7 carry out the molding method of multiple injection using the multiple injection molding die,
Be characterized in that: shaped article with a thickness of 50~300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336647.4A CN110103411A (en) | 2019-04-24 | 2019-04-24 | A kind of multiple injection molding die and the injection moulding method using the mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336647.4A CN110103411A (en) | 2019-04-24 | 2019-04-24 | A kind of multiple injection molding die and the injection moulding method using the mold |
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| CN110103411A true CN110103411A (en) | 2019-08-09 |
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| CN201910336647.4A Pending CN110103411A (en) | 2019-04-24 | 2019-04-24 | A kind of multiple injection molding die and the injection moulding method using the mold |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110587933A (en) * | 2019-11-14 | 2019-12-20 | 常源科技（天津）有限公司 | Oil cylinder core-pulling type micro-mold-opening foaming device |
| CN112976465A (en) * | 2021-02-09 | 2021-06-18 | 珠海格力电器股份有限公司 | Injection molding method of track base plate, injection molding structure and process flow thereof |
| CN115609876A (en) * | 2022-10-26 | 2023-01-17 | 北京化工大学 | Mould capable of stepless adjusting cavity volume |
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| EP0419953A2 (en) * | 1989-09-26 | 1991-04-03 | BASF Magnetics GmbH | Apparatus for two-layered injection moulding |
| CN1860013A (en) * | 2003-09-30 | 2006-11-08 | 日本瑞翁株式会社 | Thick flat-plate molded product and method of producing the same |
| JP2011025472A (en) * | 2009-07-23 | 2011-02-10 | Panasonic Electric Works Co Ltd | Foamed molding, method of manufacturing the same, and mold for manufacturing the same |
| ES2387905A1 (en) * | 2012-08-06 | 2012-10-03 | Composites Aragón, S.L. | Mold for composite elements with variable thickness (Machine-translation by Google Translate, not legally binding) |
| CN203019627U (en) * | 2013-01-07 | 2013-06-26 | 象山星旗电器科技有限公司 | Injection molding die |
| CN207841941U (en) * | 2018-01-31 | 2018-09-11 | 许勇 | A kind of injection mold that cavity depth is controllable |
| CN109159369A (en) * | 2018-07-11 | 2019-01-08 | 刘福芳 | A kind of automobile plate injection mold convenient for depanning |
| CN109551710A (en) * | 2018-09-21 | 2019-04-02 | 上海安费诺永亿通讯电子有限公司 | A kind of multi-layer injection molding molding die for super thick material block |
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2019
- 2019-04-24 CN CN201910336647.4A patent/CN110103411A/en active Pending
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| EP0419953A2 (en) * | 1989-09-26 | 1991-04-03 | BASF Magnetics GmbH | Apparatus for two-layered injection moulding |
| CN1860013A (en) * | 2003-09-30 | 2006-11-08 | 日本瑞翁株式会社 | Thick flat-plate molded product and method of producing the same |
| JP2011025472A (en) * | 2009-07-23 | 2011-02-10 | Panasonic Electric Works Co Ltd | Foamed molding, method of manufacturing the same, and mold for manufacturing the same |
| ES2387905A1 (en) * | 2012-08-06 | 2012-10-03 | Composites Aragón, S.L. | Mold for composite elements with variable thickness (Machine-translation by Google Translate, not legally binding) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110587933A (en) * | 2019-11-14 | 2019-12-20 | 常源科技（天津）有限公司 | Oil cylinder core-pulling type micro-mold-opening foaming device |
| CN112976465A (en) * | 2021-02-09 | 2021-06-18 | 珠海格力电器股份有限公司 | Injection molding method of track base plate, injection molding structure and process flow thereof |
| CN112976465B (en) * | 2021-02-09 | 2022-05-27 | 珠海格力电器股份有限公司 | Injection molding method of track base plate, injection molding structure and process flow thereof |
| CN115609876A (en) * | 2022-10-26 | 2023-01-17 | 北京化工大学 | Mould capable of stepless adjusting cavity volume |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190809 |
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| RJ01 | Rejection of invention patent application after publication |