CN101195265A - Injection molding method for high-accuracy plastics optics parts - Google Patents
Injection molding method for high-accuracy plastics optics parts Download PDFInfo
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- CN101195265A CN101195265A CNA2007101923235A CN200710192323A CN101195265A CN 101195265 A CN101195265 A CN 101195265A CN A2007101923235 A CNA2007101923235 A CN A2007101923235A CN 200710192323 A CN200710192323 A CN 200710192323A CN 101195265 A CN101195265 A CN 101195265A
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Abstract
The invention provides a method of injection molding of plastic optical elements, which comprises a die and resin and relates to the molding method that molten resin is injected in a metal mold which is heated to the temperature higher than that of resin conversion (the injection volume is the volume that the pressure of the resin in the closure of opening the die is just the atmospheric pressure), a gate is rapidly sealed by employing the design of globule sealing, after the temperature and the pressure are uniform, the resin is slowly cooled to the temperature lower than the heat distortion temperature under the condition that the relative volume is certain and the temperature and the pressure are uniform, and then the die is opened and forming products are taken out. After the injection of the resin is finished, the gate is sealed by employing the globule, thereby the pressure maintaining, a compressing mechanism and the work thereof are not needed and the metal die which is injected with the resin is easy to be taken off from molding machines and is cooled for a long time via the means of the monomer separation from forming machines, thereby largely increasing the work efficiency of the molding machines and simultaneously increasing the production efficiency per unit time. The method is applicable to the machine-shaping of the plastic optical elements, the focal length accuracy of the injection molded plastic optical elements of the invention can be controlled to 0.5-1%, the surface form accuracy is higher than lambada/4, the length tolerance reaches 0.0076 millimeters, and the thickness reaches 0.012 millimeters.
Description
Technical field
The present invention relates to the injection molding method of a kind of optical element, the injection molding method of especially a kind of plastics optics parts.
Background technology
Injection moulding is that the quantitative optical plastic that will be heated into fluid is injected in the stainless steel mould, at heating pressurized conditions compacted under, opens mould behind the cooling curing, just can obtain needed optical plastic part.
Summary of the invention
The present invention is directed to the defective of prior art, provide a kind of plastics optics parts injection molding method.
To achieve these goals, the present invention takes following measure to realize:
The injection molding method of a kind of plastics optics parts, comprise mould, resin, it is characterized in that in the metal pattern more than being heated to the resin conversion temperature that (injection volume should be for the resin of injection fusion, the pressure of resin just was the amount of the pressure of atmosphere when cooling finished to open mould), adopt a kind of bead to seal design sealing cast gate rapidly, equitemperature, pressure evenly after, under, the temperature and pressure homogeneous condition certain at relative volume, slowly be cooled to the heat distortion temperature of resin following after, open mould and take out the forming method of pressing the shape product.
The present invention has following effect with respect to prior art: the present invention carries out gate seal with bead after resin injection, thereby do not need pressurize and compressing mechanism and work thereof, so having injected the metal die behind the resin is easy to take off from make-up machine, the form that breaks away from the moulding fuselage with the metal die monomer is cooled off for a long time, this has not only improved the operating efficiency of make-up machine greatly, has also improved the production efficiency of unit interval simultaneously.
The specific embodiment
The gate seal molding procedure divides 4 step operations to carry out:
(1) heating process, heating is conducted in outside by metal die, till being heated to uniform temperature more than the Tg (conversion temperature of resin-be the temperature that mould is heated and need be reached) from the taking-up temperature of moulding product, heat up with the very short time, make temperature accomplish homogenising.
(2) molding procedure, the resin of injection fusion in mould makes bead with after the mould gate sealing, accomplishes homogenising for making temperature, pressure, and metal pattern is incubated.
(3) slow cooling operation is utilized to keep the mechanism of mold clamping force voluntarily, Yi Bian keep the matched moulds state, take off press-moulding die from forming press on one side, the monomer casted die mould that takes off adopts the natural air cooling or forces air cooled mode, lowers the temperature gradually with the speed of 1～2 ℃ of per minute.
(4) take out operation, from press-moulding die, take out formed products,,, just can open pattern and take out formed products as long as at this moment take off the mechanism that keeps mold clamping force voluntarily because casted die mould takes off from forming press.In formed products taking-up process, because the pressure of resin is equivalent to the pressure of atmosphere, so do not need ejecting device, as long as open the part of outstanding die joint, formed products just can be from mould.
The key issue of the gate seal method of forming is, be expelled to the molten resin of 300 ℃ of left and right sides high temperature in the mould, pressure as 130MPa how is dead with gate seal, its way is, before the moulding injection, earlier a bead is put into the gate part of metal die, when injecting molten resin in mould, bead is subjected to the extruding of resin will be from cast gate near die cavity one side shifting, at this moment, the gap will appear in the place that leads to die cavity at gate part, molten resin can flow into the die cavity from this gap, and when injection (mo(u)lding) machine stopped to mould inner high voltage injecting resin, because pressure reduction, resin adverse current phenomenon took place in moment, bead then by the resin of this adverse current again near a thruster of die cavity cast gate to mould, at this moment, bead relies on the extruding force that resin took place of high pressure that mould gate is blocked, and finishes gate seal work.
In the reality, the present invention is applied to the machine-shaping of optical plastic part, and the focal length precision of its injection molding optical plastic part can control to 0.5～1%, and surface figure accuracy is higher than λ/4, and length tolerance reaches 0.0076mm, and thickness deviation reaches 0.012mm.
Claims (3)
1. injection molding method of plastics optics parts, comprise mould, resin, it is characterized in that in the metal pattern more than being heated to the resin conversion temperature that (injection volume should be for the resin of injection fusion, the pressure of resin just was the amount of the pressure of atmosphere when cooling finished to open mould), adopt a kind of bead to seal design sealing cast gate rapidly, equitemperature, pressure evenly after, under, the temperature and pressure homogeneous condition certain at relative volume, slowly be cooled to the heat distortion temperature of resin following after, open mould and take out the forming method of pressing the shape product.
2. according to claim 1, it is characterized in that utilizing the mechanism that keeps mold clamping force voluntarily, keep the matched moulds state on one side, take off press-moulding die from forming press on one side, the monomer casted die mould that takes off, adopt the natural air cooling or force air cooled mode, lower the temperature gradually with the speed of 1～2 ℃ of per minute.
3. according to claim 1, it is characterized in that before the moulding injection, earlier a bead is put into the gate part of metal die, when injecting molten resin in mould, bead is subjected to the extruding of resin will be from cast gate near die cavity one side shifting, at this moment, the gap will appear in the place that leads to die cavity at gate part, molten resin can flow into the die cavity from this gap, and when injection (mo(u)lding) machine stops to mould inner high voltage injecting resin, reason owing to pressure reduction, resin adverse current phenomenon takes place in moment, bead then by the resin of this adverse current again near a thruster of die cavity cast gate, at this moment to mould, bead relies on the extruding force that resin took place of high pressure that mould gate is blocked, and finishes gate seal work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101923235A CN101195265A (en) | 2007-12-24 | 2007-12-24 | Injection molding method for high-accuracy plastics optics parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101923235A CN101195265A (en) | 2007-12-24 | 2007-12-24 | Injection molding method for high-accuracy plastics optics parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101195265A true CN101195265A (en) | 2008-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101923235A Pending CN101195265A (en) | 2007-12-24 | 2007-12-24 | Injection molding method for high-accuracy plastics optics parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101195265A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108215086A (en) * | 2016-12-01 | 2018-06-29 | 赫斯基注塑系统有限公司 | A kind of hot-runner nozzle |
-
2007
- 2007-12-24 CN CNA2007101923235A patent/CN101195265A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108215086A (en) * | 2016-12-01 | 2018-06-29 | 赫斯基注塑系统有限公司 | A kind of hot-runner nozzle |
| CN108215086B (en) * | 2016-12-01 | 2020-06-30 | 赫斯基注塑系统有限公司 | Hot runner nozzle |
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|---|---|---|---|
| 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: 20080611 |