CN109624202A - A kind of gas assistant injection molding method of handle of automobile roof - Google Patents
A kind of gas assistant injection molding method of handle of automobile roof Download PDFInfo
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- CN109624202A CN109624202A CN201811221700.8A CN201811221700A CN109624202A CN 109624202 A CN109624202 A CN 109624202A CN 201811221700 A CN201811221700 A CN 201811221700A CN 109624202 A CN109624202 A CN 109624202A
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- gas
- mold
- injection molding
- injection
- molding method
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N3/00—Arrangements or adaptations of other passenger fittings, not otherwise provided for
- B60N3/02—Arrangements or adaptations of other passenger fittings, not otherwise provided for of hand grips or straps
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
Abstract
The invention belongs to technical field of automobile parts, and in particular to a kind of gas assistant injection molding method of handle of automobile roof.The following steps are included: the plastics of (1) melting inject mold cavity, after mold injection is full, pressure maintaining by 2 or 2 or more cast gates；(2) molten plastic by 2 or 2 or more air inlets into mold cavity injects inert gas, and the inert gas pressure of injection is greater than injection molding stock pressure, and the partial melting plastics in mold cavity flow back into cast gate, form hollow state；(3) pressure maintaining, it is cooling, mold is opened, product is taken out.
Description
Technical field
The invention belongs to technical field of automobile parts, and in particular to a kind of gas aided injection mould of handle of automobile roof at
Type method.
Background technique
Air-auxiliary injection forming (hereinafter referred to as " gas assisted molding " or Polymer Processing GAIM) relatively new as one kind
Technology just obtains extensive industrial applications until last century Mo.Compared with regular injection forms (CIM), gas assisted molding has
It saves material, shortens molding cycle, reduces the advantages that clamp force and product good stability of the dimension.Usually in gas assisted molding mistake
Cheng Zhong needs to use high-pressure inert gas as gas is penetrated, pushes simultaneously comperession polymer melt, until melt is full of entire mould
Tool type chamber, melt gradually cools and solidifies under the pressure maintaining effect of gas later, after product temperature is down to calcining temperature, Ji Kekai
Mould takes out product.It is more more complicated than traditional injection moulding forming technique on gas assisted molding technological essence, on the one hand, gas assisted molding technology needs
Install gas injection equipment additional on traditional injection forming mold, die cost increases, and needs to consider gas when designing mold
Body spout is sized and located to；On the other hand, gas assisted molding needs to consider more procedure parameters: as gas delay time,
Gas injection pressure and gas injection time etc..
In following published automobile handle gas assisted molding method, such as Chinese patent application (CN 103802273A) public affairs
A kind of gas disclosed in a kind of truck top handle assisted injection molding techniques and Chinese patent application (CN 103434083A) opened
Auxiliary to blow handle process and its handle body, the method for use is that first molten resin is injected into mold cavity, so
It is molten that compressed gas (mainly nitrogen) is introduced by type chamber by the air tube in the special nozzle or mold that are mounted on machine barrel afterwards
In glue, after pressure maintaining and cooling, by gas quick drain.The technology being had disclosed using these is existed in production different degrees of
" gas refers to " defect of size: bubble passes through the thin-wall regions except product air flue, forms " referring to dress " branch.Serious " gas refers to " meeting
The intensity for reducing plastic products, causes the failure of gas assisted molding technology, or cannot play the advantage of gas assisted molding technology.This
Outside, if the technological parameter of Gas-assisted Injection Molding does not obtain Reasonable Regulation And Control, it is easy to produce molten trace, not only influences moulding appearance
Image, and mechanical property also will receive certain influence.
Summary of the invention
The present invention existing handle of automobile roof gas assisted molding technology there are aiming at the problem that, provide a kind of new gas it is auxiliary at
Type method fills melt uniformly by the way that multiple cast gates are arranged, and uses multiple air inlets, and opposite air inlet, reduction gas refers to scarce
The generation for falling into and being molded molten trace, effectively improves gas assisted molding quality of item.
In order to reach above-mentioned purpose of the invention, using following technical scheme: a kind of gas auxiliary of handle of automobile roof
Injection molding forming method, comprising the following steps:
(1) plastics melted inject mold cavity, after mold injection is full, pressure maintaining by 2 or 2 or more cast gates；
(2) inert gas is injected by molten plastic of 2 or 2 or more the air inlets into mold cavity, injection it is lazy
Property gas pressure be greater than injection molding stock pressure, the partial melting plastics in mold cavity flow back into cast gate, form hollow state；
(3) pressure maintaining, it is cooling, mold is opened, product is taken out.
Preferably, the dwell time in step (1) is 1-5s.
Preferably, plastic melt temperature is 210-250 DEG C when injection molding, mold temperature is 50-70 DEG C.
Preferably, the air inlet is 2, it is separately positioned on the left and right ends of mold, vertical air inlet.
Preferably, the inert gas pressure of injection is 5-20MPa, temperature is lower than 25 DEG C, gas injection time 2-5s.
Preferably, the inert gas is the mixture of nitrogen or carbon dioxide or nitrogen and carbon dioxide.
Preferably, the dwell time in step (3) is 5-10s.
Preferably, it is described be cooled to be placed in it is cooling in -100~-180 DEG C of liquid nitrogen.
Compared with prior art, the present invention has the following advantages:
(1) present invention use 2 or 2 or more cast gates, improve injection efficiency, and keep melt flows direction disorderly and unsystematic or
It is unordered, and then inhibit the generation of plastic products warping phenomenon；
(2) present invention is by the opposite air inlet of multiple air inlets, eliminates multiple cast gate melts and mutually converges generated weld mark, and
Gas fingering defect is reduced, to improve the performance of product；
(3) in the present invention, inert gas pushes melt flows, and extra melt is back in cast gate, compares traditional gas
Shaping is conducive to eliminate weld mark, reduces melt internal stress；
(4) in the present invention, mold is quickly cooled down after being passed through gas pressure maintaining, can be reduced and be answered after product depanning in remnants
Power mitigates buckling deformation, improves product strength；
In general, novel gas assisted molding method provided by the invention advantageously reduces in handle of automobile roof moulding
Existing bad defect improves moulding image appearance, while enhancing the mechanical property of moulding.
Detailed description of the invention
Fig. 1 is air inlet and cast gate example in a gas assisted molding method of the invention.
Specific embodiment
Below by specific embodiments and the drawings the technical scheme of the present invention will be further described explanation.If without special
Illustrate, raw material employed in the embodiment of the present invention is raw material commonly used in the art, method employed in embodiment,
For the conventional method of this field.
In one embodiment of the present of invention, the gas assistant injection molding method of handle of automobile roof, comprising the following steps:
(1) plastics melted inject mold cavity, after mold injection is full, pressure maintaining by 2 or 2 or more cast gates；
(2) inert gas is injected by molten plastic of 2 or 2 or more the air inlets into mold cavity, injection it is lazy
Property gas pressure be greater than injection molding stock pressure, the partial melting plastics in mold cavity flow back into cast gate, form hollow state；
(3) pressure maintaining, it is cooling, mold is opened, product is taken out.
Current existing handle of automobile roof mold mostly uses single pouring gate structure and single layer pouring type, this to pour
Note mode speed is slower, and time of the melt full of type chamber is longer, and melt temperature reduces, and influences the stream of subsequent gases in the melt
It is dynamic；Moreover, the product of single cast gate injection molding is because melt flow time is too long, internal stress caused by flowing and contraction is larger, is easy to produce
Raw warping phenomenon.Using 2 or 2 or more cast gates, by increasing the cast gate quantity of mold, while increasing pouring along different directions
Mouthful, in this way by by molten plastic from different directions and multiple cast gates simultaneously be injected into mold, can effectively change
The flow orientation of molten plastic allows melt flows direction more disorderly and more unsystematic or unordered, and then inhibits warping phenomenon
It generates.But molten plastic enters mold cavity by multiple cast gates, a possibility that generating weld mark, greatly increases.Therefore multiple
The melt flow of cast gate needs rationally control, by debugging so that the melt of multiple cast gates is simultaneously filled with mold cavity, reduces molten
The generation of lapping defect.
By the opposite air inlet of multiple air inlets, inert gas pushes melt flows, it turned out that, this process can be eliminated multiple
Cast gate melt mutually converges generated weld mark, to improve the performance of product；And multiple inlet charges can shorten air inlet into
Journey reduces gas fingering defect.Inert gas pushes melt flows, and extra melt is back in cast gate, compare traditional gas it is auxiliary at
Type: melt fill part mold, remainder are full of by gas push melt, are conducive to eliminate weld mark, be reduced in melt
Stress.
Dwell time in step (1) is 1-5s.
For a period of time, the suitable dwell time can reduce the internal stress of product for first pressure maintaining after injection molding.With in step (1)
Dwell time increase, melt temperature is lower and lower, cooling layer thickness increase, thus increase gas transverse filling resistance, gas
Body follows resistance minimum principle along the longitudinal extension in air flue center, and gas refers to that effect is smaller and smaller.However, in gas-assistance injection molding technology
In, the time of Injection hold pressure again cannot be too long, and otherwise in product air flue after melt solidification, gas would become hard to inject, and gas is not achieved
The due effect of shaping.And long-time pressure maintaining will increase product internal stress instead.Melt cooling meat institute in pressure maintaining period
Molten gap is generated, melt flows can be pushed to fill by the inert gas being subsequently implanted into.
When injection molding, plastic melt temperature is 210-250 DEG C, and mold temperature is 50-70 DEG C.
Melt temperature and mold temperature have a certain impact to the generation tool of gas fingering defect in gas assisted molding, and melt temperature is too
Height, melt viscosity reduce, and gas enters thin-wall regions easily against melt resistance, generate gas and refer to；And mold temperature is too high, equally
Principle, be easy to produce gas and refer to phenomenon, and mold temperature is too low, temperature quickly reduces after melt injection mold, and inert gas is very
In melt difficult to get access.
The air inlet is 2, is separately positioned on the left and right ends of mold, vertical air inlet.
The left and right ends of mold are arranged in air inlet, and opposite air inlet pushes fluid to move toward one another, as described above, can be effective
It reduces multiple cast gate melts and mutually converges generated weld mark, reduce gas fingering defect.
The inert gas pressure of injection is 5-20MPa, and temperature is lower than 25 DEG C, gas injection time 2-5s.
Gas can increase with the raising of gas pressure toward the phenomenon that periphery Melt penetration, therefore gas pressure increases by one
As for the inert gas pressure that will increase gas fingering defect, but inject need to be higher than melt pressure, such gas could push
Melt flows, and gas pressure is greater than injection molding stock pressure, gas could push the part melt in mold to flow back into centre
Cast gate, melt composition hollow state.When air inlet is set as 2, and is separately positioned on the left and right ends of mold, left and right ends
Air inlet need according to the position control pressure and flow velocity of intermediate reflux cast gate so that during the melt of the right and left is back to simultaneously
Between in cast gate.
The inert gas temperature of injection is lower than 25 DEG C, and gas temperature is lower, and the melt cooling velocity on air flue and periphery is accelerated,
Air flue periphery forms cooling layer, and gas is inhibited to spread to depth direction, to play the role of reducing gas fingering defect.It is general and
Speech, the more inefficient fruit of temperature are better.
The inert gas is the mixture of nitrogen or carbon dioxide or nitrogen and carbon dioxide.
Dwell time in step (3) is 5-10s.Gas pressure maintaining 5-10s, to eliminate product internal stress.
Being cooled to be placed in -100~-180 DEG C of liquid nitrogen in step (3) is cooling.Mold is set after being passed through gas pressure maintaining
Cooling in -100~-180 DEG C of liquid nitrogen, the rapid cooling of mold can reduce residualinternal stress after product depanning, and mitigation is stuck up
Song deformation, improves product strength；The bad defect such as weld mark existing for Injection moulded part surface, dent, current mark, ripple is eliminated,
The glossiness and finish on Injection moulded part surface are improved, so that Injection moulded part quality is more perfect.
Carry out the gas assisted molding method of the present invention will be described in detail handle of automobile roof below with reference to Fig. 1 example.1,2 and in figure
3 represent 3 cast gates, and the left end in knob mold near normal face and horizontal plane intersection is arranged in cast gate 2, certainly, are arranged in right end
It can also be with.Cast gate 1 and cast gate 3 use moon shape cast gate, and moon shape cast gate is a kind of structure type of arc-shaped sub-marine gate,
Molten plastic is directly injected into die joint, and the molten plastic of injection is upwards and bottom horizontal flow sheet.Cast gate 2 uses down gate, melting modeling
Material is directly entered mold cavity, the big speed flowing of the molten plastic of injection by the big end of sprue.The melt flow of 3 cast gates needs
It rationally to control, the runner of cast gate 1 and cast gate 3 is small, and flow velocity is slightly slow.The runner of cast gate 2 is big, and flow velocity is very fast, by controlling cast gate
Melt flow makes the melt of 3 cast gates be simultaneously filled with mold cavity, reduces the generation of weld mark.
4 and 5 in figure represent 2 air inlets, and air inlet 4 and air inlet 5 are separately positioned on the left and right ends of knob mold,
Vertical air inlet.
Molten plastic is injected in mold cavity by cast gate 1, cast gate 2 and cast gate 3, after mold injection is full, pressure maintaining 1-5s.
Cast gate 1 and cast gate 3 are closed, air inlet 4 and air inlet 5 are then opened, inert gas passes through 5 injection type of air inlet 4 and air inlet
In chamber melt, fluid flowing is pushed, extra fluid is back to adapted to injection system from cast gate 2, during the plastic melt in mold is formed
Then mold is placed in -100~-180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by dummy status, pressure maintaining 5-10s.
In following embodiment, the plastics used is acrylic resins, trade mark K8303.
Embodiment 1
3 cast gates and 2 air inlets of the present embodiment setting are as shown in Figure 1, melt polypropylene passes through cast gate 1,2 and of cast gate
Cast gate 3 injects in mold cavity, and melt temperature is 230 DEG C, and mold temperature is 60 DEG C, after mold injection is full, pressure maintaining 2s.It closes
Then cast gate 1 and cast gate 3 open air inlet 4 and air inlet 5, nitrogen passes through in 5 injection type chamber melt of air inlet 4 and air inlet,
Adjusting the nitrogen pressure in air inlet 5 is 8MPa, and the nitrogen pressure of air inlet 4 is 5MPa, and the nitrogen temperature of two air inlets is 0
DEG C, gas injection time 3s, nitrogen pushes fluid flowing, and extra fluid is back to adapted to injection system from cast gate 2, the plastics in mold
Then mold is placed in -180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by melt composition hollow state, pressure maintaining 6s.
Embodiment 2
3 cast gates and 2 air inlets of the present embodiment setting are as shown in Figure 1, melt polypropylene passes through cast gate 1,2 and of cast gate
Cast gate 3 injects in mold cavity, and melt temperature is 230 DEG C, and mold temperature is 60 DEG C, after mold injection is full, pressure maintaining 6s.It closes
Then cast gate 1 and cast gate 3 open air inlet 4 and air inlet 5, nitrogen passes through in 5 injection type chamber melt of air inlet 4 and air inlet,
Adjusting the nitrogen pressure in air inlet 5 is 8MPa, and the nitrogen pressure of air inlet 4 is 5MPa, and the nitrogen temperature of two air inlets is 0
DEG C, gas injection time 3s, nitrogen pushes fluid flowing, and extra fluid is back to adapted to injection system from cast gate 2, the plastics in mold
Then mold is placed in -180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by melt composition hollow state, pressure maintaining 6s.
Embodiment 3
3 cast gates and 2 air inlets of the present embodiment setting are as shown in Figure 1, melt polypropylene passes through cast gate 1,2 and of cast gate
Cast gate 3 injects in mold cavity, and melt temperature is 230 DEG C, and mold temperature is 60 DEG C, after mold injection is full, pressure maintaining 2s.It closes
Then cast gate 1 and cast gate 3 open air inlet 4 and air inlet 5, nitrogen passes through in 5 injection type chamber melt of air inlet 4 and air inlet,
Adjusting the nitrogen pressure in air inlet 5 is 8MPa, and the nitrogen pressure of air inlet 4 is 5MPa, and the nitrogen temperature of two air inlets is
30 DEG C, gas injection time 3s, nitrogen pushes fluid flowing, and extra fluid is back to adapted to injection system from cast gate 2, the modeling in mold
Expect then mold is placed in -180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by melt composition hollow state, pressure maintaining 6s.
Embodiment 4
3 cast gates and 2 air inlets of the present embodiment setting are as shown in Figure 1, melt polypropylene passes through cast gate 1,2 and of cast gate
Cast gate 3 injects in mold cavity, and melt temperature is 210 DEG C, and mold temperature is 50 DEG C, after mold injection is full, pressure maintaining 3s.It closes
Then cast gate 1 and cast gate 3 open air inlet 4 and air inlet 5, nitrogen passes through in 5 injection type chamber melt of air inlet 4 and air inlet,
Adjusting the nitrogen pressure in air inlet 5 is 9MPa, and the nitrogen pressure of air inlet 4 is 6MPa, and the nitrogen temperature of two air inlets is
10 DEG C, gas injection time 2s, nitrogen pushes fluid flowing, and extra fluid is back to adapted to injection system from cast gate 2, the modeling in mold
Expect then mold is placed in -180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by melt composition hollow state, pressure maintaining 7s.
Embodiment 5
3 cast gates and 2 air inlets of the present embodiment setting are as shown in Figure 1, melt polypropylene passes through cast gate 1,2 and of cast gate
Cast gate 3 injects in mold cavity, and melt temperature is 240 DEG C, and mold temperature is 70 DEG C, after mold injection is full, pressure maintaining 2s.It closes
Then cast gate 1 and cast gate 3 open air inlet 4 and air inlet 5, nitrogen passes through in 5 injection type chamber melt of air inlet 4 and air inlet,
Adjusting the nitrogen pressure in air inlet 5 is 10MPa, and the nitrogen pressure of air inlet 4 is 7MPa, and the nitrogen temperature of two air inlets is
2 DEG C, gas injection time 3s, nitrogen pushes fluid flowing, and extra fluid is back to adapted to injection system from cast gate 2, the modeling in mold
Expect then mold is placed in -180 DEG C of liquid nitrogen cooling, opening mold, taking-up product by melt composition hollow state, pressure maintaining 8s.
Comparative example 1
Comparative example 1 the difference from embodiment 1 is that, only one cast gate 2 of comparative example 1 is not provided with cast gate 1 and cast gate 3,
It is other same as Example 1.
Comparative example 2
Comparative example 2 the difference from embodiment 1 is that, only one air inlet 4 of comparative example 2, without air inlet 5, cast gate 2 is set
It sets in the position of former air inlet 5, extra melt is back to adapted to injection system by new cast gate 2, other same as Example 1.
Comparative example 3
Comparative example 3 the difference from embodiment 1 is that, the mold of comparative example 3 be placed under 0 DEG C of cold wind it is cooling, it is other with implement
Example 1 is identical.
The knob of embodiment 1-5 and comparative example 1-2 refer to size and most atmosphere fingerbreadth degree by calculating most atmosphere to characterize system
Gas fingering defect in product；And the notch impact strength and tensile strength of embodiment 1-5 and comparative example 1-2 knob are detected, as a result it is detailed in
Table 1.
Table 1
Refer to that size and most atmosphere fingerbreadth degree refer to degree to characterize gas by most atmosphere, as shown in table 1, the gas of embodiment 1 refers to
Defect is minimum, followed by embodiment 5 and embodiment 4, and comparative example 1-3 is because lacking the necessary technical characteristic of the present invention, gas fingering defect
It is larger.Corresponding with gas fingering defect is the reduction of plastic products performance, therefore the notch impact strength and stretching of comparative example 1-3
Intensity is substantially less than embodiment.
In addition, claimed midpoint of technical range be not exhaustive and in embodiment technical solution it is right
The same replacement of single or multiple technical characteristics is formed by new technical solution, equally all in claimed model
In enclosing；Simultaneously the present invention program it is all enumerate or unlisted embodiment in, parameters in the same embodiment are only
Indicate an example of its technical solution.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, but simultaneously
Spirit or beyond the scope defined by the appended claims of the invention is not deviated by.
Claims (8)
1. a kind of gas assistant injection molding method of handle of automobile roof, which comprises the following steps:
(1) plastics melted inject mold cavity, after mold injection is full, pressure maintaining by 2 or 2 or more cast gates；
(2) molten plastic by 2 or 2 or more air inlets into mold cavity injects inert gas, the indifferent gas of injection
Body pressure is greater than injection molding stock pressure, and the partial melting plastics in mold cavity flow back into cast gate, form hollow state；
(3) pressure maintaining, it is cooling, mold is opened, product is taken out.
2. gas assistant injection molding method according to claim 1, which is characterized in that the dwell time in step (1)
For 1-5s.
3. gas assistant injection molding method according to claim 1, which is characterized in that when injection molding, plastic melt temperature
It is 210-250 DEG C, mold temperature is 50-70 DEG C.
4. gas assistant injection molding method according to claim 1, which is characterized in that the air inlet is 2, respectively
The left and right ends of mold, vertical air inlet are set.
5. gas assistant injection molding method according to claim 1, which is characterized in that the inert gas pressure of injection is
5-20MPa, temperature are lower than 25 DEG C, gas injection time 2-5s.
6. gas assistant injection molding method according to claim 1 or 5, which is characterized in that the inert gas is
The mixture of nitrogen or carbon dioxide or nitrogen and carbon dioxide.
7. gas assistant injection molding method according to claim 1, which is characterized in that the dwell time in step (3)
For 5-10s.
8. gas assistant injection molding method according to claim 1, which is characterized in that described to be cooled to be placed in -100
It is cooling in~-180 DEG C of liquid nitrogen.
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| CN201811221700.8A CN109624202B (en) | 2018-10-19 | 2018-10-19 | Gas-assisted injection molding method for automobile roof handle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811221700.8A CN109624202B (en) | 2018-10-19 | 2018-10-19 | Gas-assisted injection molding method for automobile roof handle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111300727A (en) * | 2020-02-25 | 2020-06-19 | 金发科技股份有限公司 | Injection molding method and system for polymer |
| CN111452301A (en) * | 2020-04-15 | 2020-07-28 | 重庆贻晨兴工业设计有限责任公司 | Double-color injection mold and injection method |
| CN112936743A (en) * | 2021-03-30 | 2021-06-11 | 宁波方正汽车模具股份有限公司 | Air assisting mechanism and air blowing method |
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| CN111452301A (en) * | 2020-04-15 | 2020-07-28 | 重庆贻晨兴工业设计有限责任公司 | Double-color injection mold and injection method |
| CN112936743A (en) * | 2021-03-30 | 2021-06-11 | 宁波方正汽车模具股份有限公司 | Air assisting mechanism and air blowing method |
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| CN109624202B (en) | 2021-06-01 |
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Application publication date: 20190416 Assignee: Ningbo yako vehicle parts Co.,Ltd. Assignor: Ningbo Shuaitelong Group Co.,Ltd. Contract record no.: X2021330000245 Denomination of invention: Gas assisted injection molding method for automobile ceiling handle Granted publication date: 20210601 License type: Common License Record date: 20210904 |
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