CN1041183C - Method and system for injection molding with pressurized fluid assist in the mold - Google Patents
Method and system for injection molding with pressurized fluid assist in the mold Download PDFInfo
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- CN1041183C CN1041183C CN92115168A CN92115168A CN1041183C CN 1041183 C CN1041183 C CN 1041183C CN 92115168 A CN92115168 A CN 92115168A CN 92115168 A CN92115168 A CN 92115168A CN 1041183 C CN1041183 C CN 1041183C
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Abstract
The present invention relates to a method and a device for using pressure fluid to inject and form a plastic product with high surface quality. Pressure fluid is guided in a product which uses a cavity body of an injection mold or a transverse running channel as a boundary by a sealing bolt rod or a valve. The bolt rod or the valve is provided with a hole opening and can move between an opening position and a closing position so that gas is injected in an auxiliary flow channel of an injection mold. The method of the present invention comprises the steps: during or after resin injection, the pressure fluid enters a flow channel from the position of the hole opening to reach a mold cavity; the pressure fluid is distributed to molten plastics in the mold cavity; the fluid pressure is kept in the mold cavity until the product is formed, and then, the fluid is discharged.
Description
The present invention relates to utilize the method and apparatus of fluid pressure injection mo(u)lding, do as a wholely, it is replenishing the U. S. application U.S.NO.07/674997 on March 28th, 1991 (name be called " method and apparatus that utilizes fluid pressure and mechanism's injection-molded plastic goods ").
In the injection molding technology field, the working pressure fluid comes moulded plastic products, and this has been known technology, and this pressure fluid is typically nitrogen, and it is introduced in the die cavity with molten plastic.The example of this application is open in U.S. Pat 4101617.
Described pressure fluid is used for many purposes.At first, the inside that it makes the goods of moulding have hollow is with weight reduction with save material; Secondly, the pressure fluid in die cavity produces outside pressure, makes plastics lean against the surface of injection molding when goods solidify, and this is that to reduce the indenture of the thicker cross section of goods (as structural ribs) to greatest extent desirable with the raising surface quality.Other advantage comprises: reduce the distortion of stress and colour code; The closing line position can be controlled preferably; With the big parts of the press production of little tonnage; Shorten the hardening time of thick cross section part; Without hot flow path; Has good surface smoothness; Strengthened in the tubular section.
Yet, inject the equipment of the required increase of fluid and cost and the complexity that process control parameter has increased this injection mo(u)lding greatly.
Another problem is, when gas and plastics inject injection molding by same notes mouth, gas is blocked in to be annotated in the mouth zone, thereby the molten resin in the exhaust cycle chien shih should the zone bubbles, and this foamed plastics reinjects will cause the blemish of next product in the mould.
People are special, and what be concerned about is fluid filling component and fluid circuit, and they are used for being filling under repeatedly a large amount of necessary controlled times of production high-quality part and the pressure condition, injection and blowdown presssure fluid.Conventional device is by using complicated valve and seal to address the above problem, and these valves and seal costliness, is difficult to control and needs often safeguard and change that this problem can be more sharp-pointed when seal reduces its service life because of operation.
In U.S. Pat 4935181, US4555225, US4740150 and US4942006, given description with the come example of injection pressure fluid of plastics coupler branch.Usually, owing to wish introducing pressure fluid apart from the near as much as possible place of the die cavity that limits goods, to shorten the path of pressure fluid, so a problem of many this devices is exactly that the hole that pressure fluid is flowed through may be melted plastics and stop up by plastic resin; Another problem is, when pressure fluid was introduced in the goods in the injection molding through tightening latch, uncontrolled pressure fluid leaked around tightening latch.
U.S. Pat 4943407 discloses a kind of method, device and mechanism that utilizes pressure fluid (being generally nitrogen) injection-molded plastic goods, and wherein, described mechanism is used for preventing the gaseous contamination molten resin at the notes mouth.In an embodiment of this patent, in said mechanism, used a rotary valve, it is positioned at the down gate zone of injection molding, a position at valve, molten plastic therefrom flows through, and in another position of valve, valve then stops flowing of plastics and makes gas introduce down gate.
Disclosed french patent document NO.P.V.8912991 (name be called " under pressure, gas is injected in the processing injection molding of plastic material of a single-piece; use a kind of like this injection molding and press of injector; and resulting plastic products ") a fixing air injector described, it stretches in the die cavity, and gas is through being injected in the die cavity in sheath body of injector and a very little gap of diameter between the one bar.
The method and apparatus that the purpose of this invention is to provide a kind of injection-molded plastic goods, its use one adjacent with the die cavity that limits goods or among the die cavity and the seal valve that can between unlatching and closing position, move, in order to introduce pressure fluid, prevent to pollute the molten resin in device notes mouth simultaneously.
For realizing above-mentioned purpose of the present invention and other purpose, the application provide a kind of in injection molding apparatus the method for injection-molded plastic goods.Injection molding apparatus comprises a resin coupler and an injection molding, injection molding have one in the upstream in order to receive hand-hole from the molten resin of annotating mouth, die cavity, one in the downstream between the upstream and downstream with so that the resin flow channel and a secondary channels that links to each other with resin flow channel that fluid circulates in hand-hole and die cavity.Method of the present invention comprises: to the exert pressure of fluid to be scheduled to of filling, inject molten plastic with specified injection pressure through hand-hole and runner by annotating mouth in die cavity then.This method also comprises: pressure fluid is guided to led to secondary channels and lead in the hole of the resin flow channel between the position, upstream and downstream in injection molding, and it is introduced runner by this hole, distribute to the molten plastic in the die cavity.This method also further comprises: stop the fluid of being introduced to be moved into through hand-hole by runner and annotate in the mouth, keep fluid pressure to form in die cavity up to goods in goods, then fluid is entered atmosphere.Injection molding comprises a cross gate and valve gear, this valve gear has away from the aperture of annotating mouth and can move with respect to cross gate between unlatching and closing position, the fluid that this valve gear allows in the enable possition to be filled passes the aperture transmission, and stops the fluid flow through orifice mouth of being filled to enter cross gate in the runner in closing position.The step of introducing fluid also comprises mobile described valve gear and aperture.Described runner does not extend in the valve.
In order to realize above-mentioned purpose of the present invention and other purpose, also provide a kind of injection molding apparatus that is used for the injection-molded plastic goods at this.This device comprises an injection moulding machine and an injection molding, injection moulding machine has a notes mouth that is used to introduce molten plastic, and injection molding has the resin flow channel that comprises cross gate and a secondary channels that links to each other with this runner that die cavity, that a resin hand-hole, that receives molten plastic at upstream position limits the moulding article shape at downstream position make hand-hole and fluid in the die cavity be communicated with between the position, upstream and downstream; This device also comprises fluid filling device and the fluid circuit device with the pressurization of predetermined pressure convection cell, fluid circuit is installed between the upstream and downstream position leading to the place, aperture that fluid is introduced the secondary channels of cross gate runner and fluid filling device is interconnected, the fluid of inserting is distributed to the molten plastic in the die cavity.The fluid circuit device further comprises valve gear, and it has away from the aperture of described notes mouth and can move with respect to cross gate between unlatching and closing position.Valve gear is introduced cross gate with the fluid of filling through the aperture in the enable possition, and stops the fluid of being filled to feed cross gate in closing position.Runner does not stretch in the valve gear.
Valve gear preferably can rotatablely move.
Valve gear preferably also comprise one can be between extended position and retrieving position with respect to the push rod of the remainder motion of valve gear.Method of the present invention also preferably further comprise open injection molding, then mobile push rod to its extended position from die cavity, to eject the step of goods.
Fluid intake or go into a little position in the downstream of annotating mouth and adjacent in order to limiting the die cavity of goods, or be among the die cavity, injection molding is relatively cool in this zone of injection molding.In many existing traditional structures, going into of fluid a little is to be in process to annotate in the zone of mouth.At this place, plastics are warm and be in its forming temperature quite.
Above-mentioned purpose of the present invention and other purpose, characteristics and advantage by with reference to the accompanying drawings to the detailed description of the optimised form that carries out an invention, will be more obvious.
Fig. 1 is a phantom, and it has represented method and apparatus of the present invention, and wherein, the notes mouth of device comprises a shutoff valve;
Fig. 2 is the cutaway view of an aeroembolism or valve, and it has a push rod that is positioned at cross gate one side of Fig. 1 injection molding, and has dotted the unlatching and the closing position of valve;
Fig. 3 is and the similar view of Fig. 2 that just air valve is positioned at cross gate and is in the close position;
Fig. 4 is and the similar view of Fig. 3 that air valve wherein is in its enable possition;
Fig. 5 is a phantom, and air valve wherein is in the enable possition;
Fig. 6 is a view similar to Fig. 2, has further represented the aperture in aeroembolism;
Fig. 7 is a phantom, has represented that gas is injected into the state of injection molding and air valve injection molding and plastic products after the cross gate deflection;
Fig. 8 is a phantom, represented the state of gas injection molding and plastic products after aeroembolism and a secondary channels are injected goods;
Fig. 9 is that wherein the gas bibcock is in the enable possition along the phantom of 9-9 line among Fig. 8;
Figure 10 is and the similar view of Fig. 9 that this moment, air valve was in the close position;
Figure 11 is and the similar view of Fig. 8 that this moment, gas was injected into the cross gate system, and did not enter goods.
Referring to Fig. 1, method of the present invention is used for the plastic products that moulding has hollow section, in the die cavity 10 that is limited by injection molding 12 in the product molding process pressure fluid is arranged.The existence of pressure fluid produces an outside pressure, and it minimizes indenture, and reduces the weight of material usage and moulded products.
At first, with a predetermined exert pressure, this pressure can be higher or lower than specified injection pressure to the fluid of filling.The best way and the device of convection cell pressurization are described in the above-mentioned common pending application.If inject fluid during injecting resin, the pressure that injects fluid can be lower than injection pressure, if introduce fluid after injecting resin, then fluid pressure can be higher or lower than injection pressure.
Then, molten plastic is annotated mouth 14 by one of common injection moulding machine inject die cavity 10 through a runner with specified injection pressure, the amount of molten plastic (being the plastics shots) is less than the required amount of plastic of common loading mould cavity.
Then, pressure fluid (preferably nitrogen) is connected and 16 introduced above-mentioned runner through an aperture from chamber, an aeroembolism or valve 18 are passed in hole 16.
In case injected plastic finishes substantially, with regard to controlled pressure fluid flow through orifice mouth 16, fluid enters runner and arrives die cavity always then.When plastics solidify and the fluid that keep-ups pressure in injection molding when determining the shape of moulded parts, at this moment, pressure fluid produces outside pressure, and this pressure forces plastics consistent with the thin portion structure on injection molding surface, make it to have good thin portion structure, and make indenture or other blemish minimum.
At last, before opening the smooth moulded parts of injection molding taking-up, fluid is discharged from die cavity.
Fig. 1 is the total schematic diagram that is used to realize the apparatus structure of injection molding forming method of the present invention.
Utilize an improved injection molding 12 to realize the control input of pressure fluid (being typically nitrogen).Injection molding 12 comprises aeroembolism or valve 18, and valve 18 is installed in rotation in the cross gate 20 of injection molding 12 Lower Halves, or adjacent with it installation.
An injection molding down gate 22 matches with the notes mouth 14 of a common injection moulding machine, and the notes mouth 14 of make-up machine matches with injection molding 12 lip-deep concave surfaces 24, thereby provides a continuous passage 26 for plastics flow into die cavity 10 from make-up machine through down gate 22.
Through aperture 16 pressure fluid is introduced in the runner.
Valve 18 is installed in rotation in the injection molding 12 by a lining 28, and lining 28 has a through hole 30, and it is aimed at an air flue 32 that passes injection molding 12 Lower Halves and extend.
Referring to Fig. 7, the air-flow in the air flue 32 is by intake valve 34 and air bleeding valve 36 controls, and intake valve 34 itself communicates with a device to valve 18 fillings and introducing pressure fluid or gas again, and this has made detailed description in above-mentioned application.
The bottom of valve 18 has a rack rails fixed thereon or transmitting gear 42, so that a rotating driver or other driver can transmitting gear 42 and whole valves 18.
Valve 18 also comprises a push rod 44, and it is slidably mounted in the carriage of valve 18, moves between extended position and retrieving position.By retrieving position to extended position between moving period, push rod 44 can eject working of plastics from the injection molding of opening 12.
During the injection moulding stroke or after a while during this, valve 18 rotations, thereby make hole 16 go to its enable possition by its closing position, shown in Fig. 2～4, then, in case excite valve 34 (valve 36 closures this moment), just through runner 32 to fluid injecting hole mouth connection gas.The fluid pressure at 16 places has predetermined value in the hole.The fluid pressure value at 16 places can be determined by some artificial processs of the test with to the examination of the moulded parts surface quality produced in process of the test in the hole.
When injecting gas, gas moves along the route of resistance minimum in die cavity.Because molten plastic is from the inside cooling curing of its outer surface, so gas will enter the heat and the softer inside of plastics, common this improved plastics structural shape has thicker cross section (as structural ribs), and in this zone, the inside of plastics produces a cavity and plastics is outwards expanded with loading mould cavity.Gas in forming process injects the stage, can make gas pressure keep an effective constant, perhaps makes the pressure decay when gas expands in plastics.
Find that in operation the plastics that in a single day fluid that is injected contacts die cavity will run into an initial resistance, in case and gas enter plastics, resistance will obviously descend.Therefore, should make fluid keep a higher initial breakdown pressure, step by step or with other form fluid pressure be descended again afterwards, to avoid when plastic products form in die cavity at the unnecessary high fluid pressure of the inner generation of goods.Controlledly reduce pressure in plastic cool and before solidifying, can reduce the possibility that stress appears in goods, have the goods of stress outside injection molding, will produce distortion.
When plastic products fully cool off, structurally can self-supporting the time, (this advances valve 34 and closes) enters atmosphere with gas wherein through same hole 16 under the control of valve 36.Gas purging can only be finished by hole 16, perhaps with annotate motion that mouth 14 leaves injection molding 12 (being that down gate disconnects) and combine and finish.
Preferably metering or the discharging of adjustments of gas in atmosphere is to reduce liquid plastic taken out of or contaminated-fluid and therefore and danger such as the pollution of the convection cell passage that produces or obstruction.Then, injection molding can be opened and product be ejected with push rod 44.
Along with valve 18 from cross gate 20 deflections, gas will be tending towards towards down gate 22 motion (as shown in Figure 7), so, in annotating mouth 14, used a shutoff valve 46, to stop gas to enter geat 22, on the contrary, gas will be used for filling molten resin at the down gate 22 of injection molding 12.
When valve 18 is in fact in die cavity 10 or cross gate 20, prevented that pressed gas from polluting the plastics of annotating in the mouth 14, even under the situation of injecting gas on the direction identical, also be like this with plastic flow direction shown in Figure 4 there not being shutoff valve.
Obviously, the direction of plastic flow is never directly led in hole 16 along resin flow channel between upstream position and downstream position, thereby also just is different from former design, has the plastics coagulation problem in hole 16 hardly.
To Figure 10, provided an alternative embodiment of the invention at this referring to Fig. 8, wherein, one is installed in rotation in the injection molding 12 ' that has improved by the tightening latch of 18 ' expression or valve, and tightening latch 18 ' is sealed by a pair of lip ring 38 ' that separates and 40 '.
Pressed gas injects the cavity 10 ' in order to the qualification goods in the injection molding 12 ' through the secondary channels 52 of the low flat position 50 of via hole 16 ', tightening latch 18 ' and formation in injection molding 12 '.The secondary channels 52 between the seal 38 ' and 40 ' that separates is led in hole 16 '.Seal 38 ', 40 ' and the application of secondary channels 52 stoped the leakage of pressed gas along tightening latch 18 ' side, in other words, secondary channels 52 and seal 38 ', 40 ' make tightening latch 18 ' " hermetic seal ".The low flat portion 50 of tightening latch 18 ' makes the hole of secondary channels 52 needn't accurately aim at the hole 16 ' of tightening latch shown in Figure 9 18 ' enable possition.Figure 10 shows the tightening latch 18 ' that is in the close position.
The end face 54 of tightening latch 18 ' limits resin flow channel at least in part in the die cavity 10 ' that limits goods, and the cylindrical side 56 of tightening latch 18 ' is not except joining with resin the zone of secondary channels 52.
Figure 11 has represented at the improved injection molding 12 of another kind " in rotation tightening latch 18 ', the tightening latch 18 ' that different is among Figure 11 is arranged in injection molding 12 " the cross gate system.Pressed gas injects mould 12 " secondary channels 52 " but do not enter injection molding 12 " down gate 22 " in, on the contrary, by secondary channels 52 " gas that comes out flows into (not shown) in the cavity that limits goods.At injection molding 12 " in, the end face of tightening latch 18 ' 54 helps to constitute injection moldings 12 " parting line 60.
See Fig. 8 again to Figure 10, seal 38 ' and 40 ' is with secondary channels 52 " application prevented pressed gas from the side leakage of tightening latch 18 ' (that is, the gas path of getting the resistance minimum enters secondary channels 52 one by one " in resin in).
Though it is rotatable tightening latch that each tightening latch 18,18 ' all is described to, thus be to use one can straight-line tightening latch and a sleeve pipe with holes come injecting gas by the secondary channels of injection molding, this also can realize one aspect of the present invention at least.
Describe in detail implement best mode of the present invention after, the personnel that are familiar with field of the present invention can draw various designs and structure realizes the invention that dependent claims limits.
Claims (14)
1. the method for injection-molded plastic goods in injection molding apparatus, this device comprises a resin notes mouth and an injection molding, this injection molding has one and is used for from annotating resin flow channel and secondary channels that communicates with resin flow channel that hand-hole that mouth receives molten resin, die cavity at downstream position, one be used to make hand-hole and die cavity between the position, upstream and downstream fluid is connected at upstream position, it is characterized in that this method comprises the following steps:
With the predetermined pressurized with fluid of pressure to filling;
To die cavity in inject molten plastic by annotating mouth through hand-hole and runner with specified injection pressure;
The pressure fluid of filling guided to lead to secondary channels, also lead to the place, an aperture of the resin flow channel between the position, upstream and downstream in injection molding;
The fluid of filling is introduced in the runner from described aperture, distributed to the molten plastic that is arranged in die cavity;
Prevent that the fluid of being introduced from being reached in the notes mouth through hand-hole by runner;
In goods, keep fluid pressure, in die cavity, form until goods;
Fluid is drained into atmosphere;
Wherein injection molding comprises a cross gate and valve gear, this valve gear has away from the aperture of annotating mouth and can move with respect to cross gate between unlatching and closing position, valve gear allows the fluid filled to enter secondary channels through above-mentioned aperture and enters cross gate in the runner then in the enable possition, then stop the fluid flow through orifice mouth in closing position, in addition, the step of described introducing fluid comprises mobile above-mentioned valve gear and aperture, and described runner does not extend in the valve gear.
2. the method for claim 1, it is characterized in that, wherein said, injection molding comprises valve gear, this valve has away from the aperture of annotating mouth and can the other parts with respect to injection molding rotatablely move between unlatching and closing position, the fluid that valve gear allows in the enable possition to be filled transmits in the runner of going forward side by side through the aperture, then stop the fluid of being filled to flow in closing position and enter runner through the aperture, the step of described introducing fluid comprises rotating valve device and aperture, and described runner does not extend in the above-mentioned valve gear.
3. method as claimed in claim 1 or 2 is characterized in that, described fluid is a kind of gas.
4. method as claimed in claim 1 or 2 is characterized in that, fluid is to discharge from goods through identical same aperture, aperture used when introducing fluid.
5. method as claimed in claim 1 or 2, it is characterized in that, described valve gear comprise one can be at extended position and retrieving position push rod with respect to the remainder motion of valve gear, described method further comprises opens injection molding, promotes push rod ejects goods from die cavity to its extended position step then.
6. method as claimed in claim 1 or 2 is characterized in that, described aperture towards the direction that is basically parallel to resin flow channel.
7. method as claimed in claim 1 or 2 is characterized in that, the aperture towards the direction that is approximately perpendicular to resin flow channel, and annotate mouth and comprise a shutoff valve.
8. method as claimed in claim 1 or 2 is characterized in that, the aperture in die cavity towards resin flow channel.
9. the injection molding apparatus of injection-molded plastic goods, it comprises:
An injection moulding machine, it has a notes mouth that is used to introduce molten plastic;
An injection molding, this injection molding have one and be used for the resin flow channel that comprises cross gate and a secondary channels that communicates with this runner that hand-hole and die cavity and fluid are connected at upstream position in order to the resin hand-hole that receives molten plastic, one at downstream position in order to the die cavity that limits the moulding article shape, one between the positions, upstream and downstream;
Be used for adding the fluid filling device that presses fit into fluid with a predetermined pressure;
It is characterized in that,
The fluid circuit device, it is in last, runner and fluid are filled out the stream device interconnect leading to the aperture place that fluid is introduced the secondary channels of cross gate between the downstream position, the fluid that is charged into is distributed to the molten plastic in the die cavity, wherein, this fluid circuit device comprises valve gear, this valve has away from the aperture of described notes mouth and can move with respect to cross gate between unlatching and closing position, described valve gear is introduced cross gate with the fluid of described filling through aperture and secondary channels in the enable possition, then stop fluid to feed cross gate in closing position, wherein, described runner does not extend in the valve gear.
10. device as claimed in claim 9 is characterized in that, described valve gear have one can be between extended position and retrieving position with respect to the push rod of the remainder motion of valve gear, it is ejecting goods to its extended position between moving period from horizontal chamber.
11. device as claimed in claim 9, it is characterized in that, valve gear is to be sealed by a pair of seal of being separated by in injection molding, and towards secondary channels, this a pair of seal and secondary channels have stoped fluid to leak between valve gear and injection molding between two seals in the aperture.
12. device as claimed in claim 9 is characterized in that, valve gear has an end face and a side, and end face limits resin flow channel at least in part, and described aperture is passed above-mentioned side and stretched out.
13. device as claimed in claim 9 is characterized in that, valve gear is rotatable.
14. device as claimed in claim 9, it is characterized in that, wherein the fluid circuit device comprises valve gear, it has away from the aperture of described notes mouth and can the other parts with respect to injection molding rotate between unlatching and closing position, described valve gear is introduced runner with the fluid of filling through the aperture in the enable possition, then stop the fluid of being filled to feed runner in closing position, described runner does not extend in the said apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92115168A CN1041183C (en) | 1992-12-05 | 1992-12-05 | Method and system for injection molding with pressurized fluid assist in the mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92115168A CN1041183C (en) | 1992-12-05 | 1992-12-05 | Method and system for injection molding with pressurized fluid assist in the mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1087855A CN1087855A (en) | 1994-06-15 |
| CN1041183C true CN1041183C (en) | 1998-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92115168A Expired - Fee Related CN1041183C (en) | 1992-12-05 | 1992-12-05 | Method and system for injection molding with pressurized fluid assist in the mold |
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| CN (1) | CN1041183C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20021710A1 (en) * | 2002-07-31 | 2004-02-01 | John Palmer Corp | INJECTION MOLDING APPARATUS AND PROCEDURE OF |
| CN102173033B (en) * | 2011-02-18 | 2013-07-10 | 华瀚科技有限公司 | Die for strips of winding pipes |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942006A (en) * | 1988-12-01 | 1990-07-17 | Michael Ladney | Method of and apparatus for injection molding with pressurized-fluid assist |
| US4943407A (en) * | 1987-09-21 | 1990-07-24 | Michael Ladney | Method of and apparatus for injection molding with pressurized fluid assist |
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1992
- 1992-12-05 CN CN92115168A patent/CN1041183C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943407A (en) * | 1987-09-21 | 1990-07-24 | Michael Ladney | Method of and apparatus for injection molding with pressurized fluid assist |
| US4942006A (en) * | 1988-12-01 | 1990-07-17 | Michael Ladney | Method of and apparatus for injection molding with pressurized-fluid assist |
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| Publication number | Publication date |
|---|---|
| CN1087855A (en) | 1994-06-15 |
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