CN101746018A - Injection molding method - Google Patents
Injection molding method Download PDFInfo
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- CN101746018A CN101746018A CN200810136443A CN200810136443A CN101746018A CN 101746018 A CN101746018 A CN 101746018A CN 200810136443 A CN200810136443 A CN 200810136443A CN 200810136443 A CN200810136443 A CN 200810136443A CN 101746018 A CN101746018 A CN 101746018A
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- melt
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- injected
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- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding method, which comprises the steps of melt injection, pressure maintaining, cooling and demolding. In the step of melt injection, a plurality of pairs of auxiliary injection gates are symmetrically arranged with the center of a main injection gate, firstly plastic melt is injected into a die cavity from the inside of the main injection gate, and the plastic melt is continuously injected from the auxiliary injection gates so that the plastic melt injected from different injection gates is connected and is gradually filled the whole die cavity. The method realizes good connection by controlling the time sequence that the plastic melt enters the die cavity so as to guarantee flowing continuity and avoid forming the flow mark, and is also matched with the control for the die flow channel and the mold temperature to realize the complete fusion of the melt so as to further improve the quality. The finished product molded by the method has excellent appearance and quality, has no flow mask, is free from spraying, has high smooth finish, and does not need to carry out secondary processing, thereby avoiding resource waste and pollution caused by the secondary processing and improving the economic benefit.
Description
Technical field
The present invention relates to a kind of injection molding forming method, more particularly, what this method adopted is hot runner mould.
Background technology
For the individual plastic parts of a certain large scale commercial product, adopt the method for injection mo(u)lding to make usually.So-called injection moulding is by molten plastic being expelled in the die cavity of mould, and the cooling back forms required product, reach eject temperature after opening mold and take out product, the plastic products quality that the method makes is higher, shape is more complicated also.Yet, if will will should use as complete parts through the product that injection mo(u)lding is produced, also must be through a series of secondary operations such as spraying decorations.In the process of secondary operations, can cause the wasting of resources and environmental pollution.
Summary of the invention
The object of the present invention is to provide a kind of injection molding forming method, the no current mark in injecting products surface that adopts this method to produce need not pass through secondary operations.
The technical solution used in the present invention is:
A kind of injection molding forming method comprises melt injection, pressurize, cooling, demoulding step.In described melt injecting step, with a main cast gate is the center, be provided with many symmetrically to dozzle, at first in described main cast gate, plastic melt is injected die cavity, when plastic melt flow to the position at described dozzle place, from this dozzle, continue the injected plastic melt, make the plastic melt that successively from different cast gates, injects be connected and also progressively be filled to whole die cavity.
The runner that is adopted is a hot flow path in the method.In described melt injection and described pressurize step, keep the cover half temperature higher 10～20 degrees centigrade than dynamic model temperature.
Have following advantage according to injection molding forming method of the invention process:
1, the time sequencing that enters die cavity by the control plastic melt realizes good linking, guarantee to flow continuously, avoid forming current mark;
2, cooperate the fusion fully that the control of mold temperature is realized melt, can further improve product property;
3, the finished product presentation quality excellence that adopts the method moulding to make, no current mark is exempted from spraying, and is highly polished, need not carry out secondary operations, and therefore the resource waste and pollution of having avoided secondary operations to cause has improved economic benefit.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described:
Embodiment 1:
The plastic front board of display.When being running gate system on its designing mould, at first a main cast gate is set on the center line top at its back side, be symmetrical centre then with the center line, left and right symmetrically is provided with many group dozzles.Like this, when carrying out the melt injection: at first plastic melt is injected die cavity from main cast gate; When plastic melt flow to the position at first pair of dozzle place, from this to continuing the injected plastic melt the dozzle and closing main cast gate; When plastic melt continues to be filled to down a pair of dozzle, open this, and close and close a pair of dozzle dozzle injected plastic melt.According to said method priority to injected plastic melt the dozzle, makes it keep molten condition can not solidify from each, and the plastic melt of each section injection is connected successively until progressively being pushed to the die cavity end.
And the running gate system that this method adopts is a TOP-TIP, so that control the temperature of each cast gate, guarantees to be connected smooth between the plastic melt that each section successively inject, can not stay defectives such as lapping defect.Main cast gate and dozzle all are arranged on the unshowy part of back side of panel, avoid influencing the outward appearance of product.
Aspect the control of mould temperature, in melt injection and pressurize step, must strictness control die cavity the molded surface temperature so that plastic melt can fuse fully.In the present embodiment, cover half, dynamic model respectively by two groups independently heating system carry out temperature control, make the cover half temperature remain on 90 degrees centigrade, the dynamic model temperature is 75 degrees centigrade, the cover half temperature is slightly high.
Every 25 millimeter one air discharge duct is set, the gas in the film chamber can be discharged smoothly with the injection process of melt.
Concrete parameter in injection moulding process should be determined according to the material of the structure of product, shape, plastics.At first need be at different plastic materials, by the temperature-controlling system of debugging mould, select suitable forming temperature, shape and the structure according to product is provided with rational gate location then, and selected each the best cast gate of test opens and closes the time, finally definite optimum process parameters.
As mentioned above, we are illustrated according to aim of the present invention fully, but the present invention is not limited to the foregoing description and implementation method.The practitioner of correlative technology field can carry out different variations and enforcement in the scope of technological thought permission of the present invention.
Claims (3)
1. injection molding forming method, comprise melt injection, pressurize, cooling, demoulding step, it is characterized in that: in described melt injecting step, with a main cast gate is the center, be provided with manyly symmetrically, at first in described main cast gate, plastic melt injected die cavity, when plastic melt flow to the position at described dozzle place dozzle, from this dozzle, continue the injected plastic melt, make the plastic melt that successively from different cast gates, injects be connected and also progressively be filled to whole die cavity.
2. a kind of injection molding forming method according to claim 1 is characterized in that: the runner that is adopted is a hot flow path in the method.
3. a kind of injection molding forming method according to claim 1 is characterized in that: in described melt injection and described pressurize step, keep the cover half temperature higher 10～20 degrees centigrade than dynamic model temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810136443A CN101746018A (en) | 2008-12-04 | 2008-12-04 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810136443A CN101746018A (en) | 2008-12-04 | 2008-12-04 | Injection molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101746018A true CN101746018A (en) | 2010-06-23 |
Family
ID=42473939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810136443A Pending CN101746018A (en) | 2008-12-04 | 2008-12-04 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101746018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623275A (en) * | 2012-03-22 | 2012-08-01 | 中国科学院化学研究所 | Method for manufacturing mass analyzer of mass spectrometer |
-
2008
- 2008-12-04 CN CN200810136443A patent/CN101746018A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623275A (en) * | 2012-03-22 | 2012-08-01 | 中国科学院化学研究所 | Method for manufacturing mass analyzer of mass spectrometer |
| CN102623275B (en) * | 2012-03-22 | 2015-01-28 | 中国科学院化学研究所 | Method for manufacturing mass analyzer of mass spectrometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100623 |