CN107618160A - A kind of vacuum injection mould and its injection technique - Google Patents
A kind of vacuum injection mould and its injection technique Download PDFInfo
- Publication number
- CN107618160A CN107618160A CN201710068174.5A CN201710068174A CN107618160A CN 107618160 A CN107618160 A CN 107618160A CN 201710068174 A CN201710068174 A CN 201710068174A CN 107618160 A CN107618160 A CN 107618160A
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- Prior art keywords
- block
- baffle
- keying
- port
- air cleft
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Links
- 238000002347 injection Methods 0.000 title claims abstract description 24
- 239000007924 injection Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 5
- 239000012528 membrane Substances 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims description 18
- 239000004033 plastic Substances 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000004568 cement Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000826860 Trapezium Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of vacuum injection mould, including the dynamic model with core rod and the cover half with membrane cavity, the cover half is provided with concentric annular gas passage and sealing ring with respect to the surface of dynamic model, a bleed-off passage is additionally provided with the cover half, one end of the bleed-off passage connects with annular gas passage, other end break-through is in cover half side wall and forms a suction interface, some radial air clefts are additionally provided between the annular gas passage and membrane cavity, when the fixed half and moving half matched moulds, the air cleft is less than the second port towards annular gas passage one end towards the first port of membrane cavity one end, it is smooth to be molded by the product edge come, flash will not be formed, and due to vacuum injection, it is not in bubble in die cavity, product is avoided to burn, product quality after injection is high.
Description
Technical field
The present invention relates to injection molding field, more specifically, it relates to a kind of mould for being applicable vacuum injection.
Background technology
Metallic article is compared, and the production efficiency of plastic cement products is high, and in light weight, anti-corrosive properties are good, using than wide.Injection production
Product mainly carry out cooling by injecting the plastics of fusing in mould and moulded, high to the structural requirement of mould.
Injection mold is usually that cope plate and lower template form, and the core rod in cope plate and lower template is engaged and produced
The shape chamber of product, the plastics of fusing are injected shape chamber from cast gate and are filled.After the mold is closed, the core rod in cope plate and lower template
Form closed shape chamber, only communicated by cast gate with the external world, shape intracavitary remains with air, the plastics of fusing from cast gate inject when,
Cast gate is filled up by plastics, and the air of shape intracavitary can not escape, and produces certain influence to the filling effect of shape chamber, is particularly noting
When moulding thin wall deep cavity product, easily there is incompleteness, reduce product qualification rate.
The content of the invention
In view of the deficienciess of the prior art, the first object of the present invention is that providing one kind is applied to vacuum injection, prevents
Only die cavity air trapping and burn the mould of product.
To achieve the above object, the invention provides following technical scheme：A kind of vacuum injection mould, including with core rod
Dynamic model and cover half with membrane cavity, the cover half surface of dynamic model is provided with concentric annular gas passage and sealing
Enclose, be additionally provided with a bleed-off passage in the cover half, one end of the bleed-off passage connects with annular gas passage, other end break-through
In cover half side wall and a suction interface is formed, some radial gas are additionally provided between the annular gas passage and membrane cavity
Seam, when the fixed half and moving half matched moulds, the air cleft is less than towards annular gas passage towards the first port of membrane cavity one end
The second port of one end.
Further it is optimized for：On-off structure is provided with the first port of each air cleft, the on-off structure includes
The keying block of first port can be sealed, one end of the keying block is articulated with the mouth side of first port, and the other end is hinged with one and kept out
Block, the baffle is with opening and closing that block is at an angle and the other end of the relative keying block of baffle is resisted against on the slotted wall of air cleft；Institute
State to be provided with one between the slotted wall for opening and closing block and air cleft and drive and open and close the first elastic component that block rotates to membrane cavity, the baffle and
The second elastic component for driving baffle to be rotated to keying block is provided between keying block, and is provided between baffle and air cleft
Limited block, when baffle is limited in limited block, the baffle limitation opens and closes block and is rotated to membrane cavity and to open and close block just
Close the first port.
Further it is optimized for：The keying block of the on-off structure is provided with symmetrical two pieces at first port, two pieces of institutes
The keying block stated mutually from one end and the slotted wall of air cleft be hinged, two pieces described to open and close the relative one end of block and is hinged with one and keep out
Block, the baffle is with opening and closing that block is at an angle and the other end of the relative keying block of baffle is resisted against on the slotted wall of air cleft；Institute
State to be provided with one between the slotted wall for opening and closing block and air cleft and drive and open and close the first elastic component that block rotates to membrane cavity, the baffle and
The second elastic component for driving baffle to be rotated to keying block is provided between keying block, and is provided between baffle and air cleft
Limited block, when baffle is limited in limited block, the baffle limitation opens and closes block and is rotated to membrane cavity and to open described in two pieces
Close block and just close the first port.
Further it is optimized for：The angle opened and closed between block and baffle is 30-45 degree.
The second object of the present invention is to provide a kind of injection technique that at least can solve the problem that above-mentioned technical problem.
To achieve the above object, the invention provides following technical scheme：A kind of vacuum using in above-mentioned technical proposal
The injection technique of injection molding, comprises the following steps：
A, fixed half and moving half carries out matched moulds, while sealing ring is compacted so that formed between membrane cavity and core rod one with it is outer
The product die cavity that boundary is fully sealed；
B, suction interface is connected by air-extractor so that the air in die cavity is extracted out to form vacuum by air cleft；
C, inject, the plastics of melting inject from cast gate, and due to the vacuum environment in product cavity, the plastics of melting will
Directly it is full of whole die cavity.
Compared with prior art, the advantage of the invention is that：When being vacuumized, negative pressure acts on from bleed-off passage
In annular gas passage, then it is applied directly on baffle, one end that baffle is resisted against on air cleft slotted wall is pulled by negative pressure,
So that baffle and the angle change opened and closed between block are big, the rotation fortune away from die cavity is done so as to which the second elastic component hauls keying block
Dynamic, while the first elastic component is compressed, and now, is opened and closed block and is opened the first port of air cleft, the air in die cavity will be by
Sucking-off forms vacuum, and once after die cavity forms vacuum, the pressure between air cleft and die cavity reaches balance, the first elastic component
Keying block will be driven to do the motion turned to die cavity, while baffle also does what is rotated to keying block in the presence of the second elastic component
Motion, until when baffle is limited on limited block, opening and closing block and just sealing first port；When injecting glue, plastics fill this
After individual product die cavity, the plastics of melting will be acted on the first port of air cleft, the bore set due to first port
Small, according to F=P*S, the power that plastic cement is acted at first port is very small, and due to the on-off structure of setting, when plastic cement is made
With when opening and closing on block, the power opened and closed on block will be passed to baffle, because the other end of baffle is resisted against the slotted wall of air cleft
On, and the volume angle between baffle and keying block is 30-45 °, so as to which the angle between baffle and slotted wall will be in 45-60 °
Acute angle, when baffle receives the power from opening and closing element, baffle will be to be applied to slotted wall with slotted wall in 45-60 ° of power
On, a locked angle is formed, avoids keying block from reversely being promoted by the plastic cement in die cavity, so that being molded by the product edge come
It is smooth, flash will not be formed, and due to vacuum injection, be not in bubble in die cavity, avoid product from burning, the production after being molded
Quality is high.
Brief description of the drawings
Fig. 1 is the sectional view under the mould matched moulds state in the present embodiment；
State diagram when Fig. 2 is the cover half on-off structure closure in the present embodiment；
Fig. 3 is Fig. 2 A portions enlarged drawing；
Fig. 4 is the state diagram when cover half on-off structure in the present embodiment is opened；
Fig. 5 is Fig. 4 B portions enlarged drawing.
In figure, 1, dynamic model；11st, core rod；12nd, gum-injecting port；2nd, cover half；21st, hot flow path；22nd, bleed-off passage；23rd, membrane cavity；3、
Sealing ring；4th, annular gas passage；5th, air cleft；61st, block is opened and closed；62nd, baffle；7th, limited block；81st, the first elastic component；82nd,
Two elastic components.
Embodiment
It is described in further detail below in conjunction with the accompanying drawings and by specific embodiment to invention, following examples are descriptive
, it is not limited protection scope of the present invention.
Embodiment one
Referring to accompanying drawing 1, for vacuum injection mould in matched moulds, the sealing ring 3 for being arranged on outmost turns will be in cover half 2 and dynamic model 1
Pressure under cause product die cavity that core rod 11 and membrane cavity 23 cooperatively form to form the space of a sealing, then air-extractor leads to
Cross suction interface, bleed-off passage 22 acts on annular gas passage 4 so that annular gas passage 4 produces suction function in air cleft
5, a plurality of atmosphere will bear directly against die cavity, and the air in die cavity is extracted out.It can be seen that air cleft 5 set when, section
It is arranged to right-angled trapezium, and the second port of close annular gas passage 4 is more than the first port close to die cavity, this set side
Formula, when the negative-pressure sucking of annular gas passage 4 is the same, negative pressure can be bigger than second port caused by first port.
Referring to accompanying drawing 3-4, during to vacuumize state, the on-off structure state diagram that is arranged at the first port of air cleft 5, herein
When, the negative pressure to come at annular gas passage 4 is acted directly on the baffle 62 of air cleft 5, the free end of baffle 62,
That is, baffle 62 is connected to that one end of the slotted wall of air cleft 5 and will pulled by negative pressure so that baffle 62 and opens and closes the angle between block 61
Degree becomes big, does the rotational motion away from die cavity so as to which the second elastic component 82 hauls keying block 61, while the first elastic component 81 is pressed
The first port of air cleft 5 is opened in contracting, now, two keying blocks 61 for being arranged on first port, and the air in die cavity will
It is sucked out to form vacuum, and once after die cavity forms vacuum, the pressure between air cleft 5 and die cavity reaches balance, the first bullet
Property part 81 will drive open and close block 61 do to die cavity turn motion, while baffle 62 also done in the presence of the second elastic component 82 to
The motion that block 61 rotates is opened and closed, until when baffle 62 is limited on limited block 7, opening and closing block 61 and just sealing first port.
Referring then to accompanying drawing 2-3, now for injecting glue state when state diagram, after die cavity is evacuated, be arranged on
Melt plastic cement in the hot flow path 21 at the position of cover half 2 flows through gum-injecting port 12 and is injected into die cavity, due to the sky before injection in die cavity
Gas has been evacuated state, and air can not possibly be trapped in product by injection moulding process, and product can be normally molded, and avoid product
Burn.After die cavity is filled shape completely, in order to ensure the structural mechanical property of product, it is necessary to continue to die cavity pressurization and pressurize,
Now die cavity will apply pressure to the first port of air cleft 5, and being arranged on the keying block 61 at first port will be stressed directly, due to
The first port of air cleft 5 is set small, and according to F=P*S, the power that plastic cement is acted at first port is very small, that is, every piece is opened
It is also very small to close the pressure that block 61 receives, and when plastic cement is acted on and opened and closed on block 61, the power opened and closed on block 61 will be passed to
Baffle 62, it is resisted against due to the other end of baffle 62 on the slotted wall of air cleft 5, and the volume between baffle 62 and keying block 61
Angle is 30-45 °, so as to which the angle between baffle 62 and slotted wall is by 45-60 ° of acute angle, is come when baffle 62 receives
From the power of opening and closing element when, baffle 62 will to be applied to slotted wall in 45-60 ° of power on slotted wall, as long as meet baffle 62 with
Frictional force between slotted wall is more than horizontal component of the baffle 62 on slotted wall, can be achieved with a locked angle, that is, meets, F*
Tan α * μ ＞ F*cos α, α here are 45-60 °, so tan α ＞ cos α, and μ is it is known that be less than 1 coefficient, from
The condition at locked angle can be realized from the point of view of above-mentioned condition, and can see when α about can about realize the bar at locked angle close to 60 °
Part, in actual applications, μ can be arranged to 0.9, α and be arranged to 50-60 °, when the pressure in die cavity act on open and close block 61 when
Wait, baffle 62 will form locked angle with slotted wall, avoid keying block 61 from reversely being promoted by the plastic cement in die cavity, so that injection
Product edge out is smooth, will not form flash.
Embodiment two
Not shown in figure, it is with the difference of embodiment one, at each first port, opens and closes block 61 and set one
Block, this set, when being vacuumized, the side of 61 opening first ports of block is opened and closed, is taken out very although can also realize
Empty effect, but had a great influence for the overall service life of on-off structure, preferred embodiment one.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of vacuum injection mould, including the dynamic model (1) with core rod (11) and the cover half (2) with membrane cavity (23), described
Cover half (2) is provided with concentric annular gas passage (4) and sealing ring (3) with respect to the surface of dynamic model (1), and the cover half (2) is interior
Be additionally provided with a bleed-off passage (22), one end of the bleed-off passage (22) connects with annular gas passage (4), other end break-through in
Cover half (2) side wall simultaneously forms a suction interface, it is characterised in that is also set between the annular gas passage (4) and membrane cavity (23)
Some radial air clefts (5) are equipped with, when the cover half (2) and dynamic model (1) matched moulds, the air cleft (5) is towards membrane cavity
(23) first port of one end is less than the second port towards annular gas passage (4) one end.
2. vacuum injection mould according to claim 1, it is characterised in that equal at the first port of each air cleft (5)
On-off structure is provided with, the on-off structure includes the keying block (61) that can seal first port, one end of the keying block (61)
The mouth side of first port is articulated with, the other end is hinged with a baffle (62), and the baffle (62) is in one with opening and closing block (61)
The other end of angle and the relative keying block (61) of baffle (62) is resisted against on the slotted wall of air cleft (5)；It is described keying block (61) with
First elastic component (81) for driving keying block (61) to be rotated to membrane cavity (23) is provided between the slotted wall of air cleft (5), it is described to support
The second elastic component (82) for driving baffle (62) to be rotated to keying block (61) is provided between block (62) and keying block (61),
And limited block (7) is provided between baffle (62) and air cleft (5), it is described when baffle (62) is limited in limited block (7)
Baffle (62) limitation opens and closes block (61) and is rotated to membrane cavity (23) and make it that opening and closing block (61) just closes the first port.
3. vacuum injection mould according to claim 2, it is characterised in that the keying block (61) of the on-off structure is in
Symmetrical two pieces are provided with Single port, the keying block (61) described in two pieces mutually from one end and the slotted wall of air cleft (5) be hinged, two
The relative one end of block (61) is opened and closed described in block and is hinged with a baffle (62), the baffle (62) is in one with opening and closing block (61)
The other end of angle and the relative keying block (61) of baffle (62) is resisted against on the slotted wall of air cleft (5)；It is described keying block (61) with
First elastic component (81) for driving keying block (61) to be rotated to membrane cavity (23) is provided between the slotted wall of air cleft (5), it is described to support
The second elastic component (82) for driving baffle (62) to be rotated to keying block (61) is provided between block (62) and keying block (61),
And limited block (7) is provided between baffle (62) and air cleft (5), it is described when baffle (62) is limited in limited block (7)
Baffle (62) limitation opens and closes block (61) and is rotated to membrane cavity (23) and cause two pieces of blocks (61) that open and close just to close described the
Single port.
4. the vacuum injection mould according to Claims 2 or 3, it is characterised in that the keying block (61) and baffle
(62) angle between is 30-45 degree.
5. a kind of injection technique using vacuum injection mould as claimed in claim 2, it is characterised in that including following step
Suddenly：
A, cover half (2) and dynamic model (1) carry out matched moulds, while sealing ring (3) is compacted so that between membrane cavity (23) and core rod (11)
Form a product die cavity being fully sealed with the external world；
B, suction interface is connected by air-extractor so that the air in die cavity is extracted out by air cleft (5) forms vacuum；
C, inject, the plastics of melting inject from cast gate, and due to the vacuum environment in product cavity, the plastics of melting will be direct
Full of whole die cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068174.5A CN107618160A (en) | 2017-02-07 | 2017-02-07 | A kind of vacuum injection mould and its injection technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068174.5A CN107618160A (en) | 2017-02-07 | 2017-02-07 | A kind of vacuum injection mould and its injection technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107618160A true CN107618160A (en) | 2018-01-23 |
Family
ID=61087925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710068174.5A Pending CN107618160A (en) | 2017-02-07 | 2017-02-07 | A kind of vacuum injection mould and its injection technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107618160A (en) |
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| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201225 Address after: Room 606, building 4, science and Technology Plaza, high tech Zone, Ningbo, Zhejiang 315000 Applicant after: Chen Bin Address before: 315000 Qiu'ai Zhen Ning Chuan Lu Nan, Yinzhou District, Ningbo City, Zhejiang Province Applicant before: NINGBO SANSHUN MACHINERY & TECHNOLOGY Co.,Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180123 |
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| WD01 | Invention patent application deemed withdrawn after publication |