CN1283440C - Dynamic pressure retaining device of injection moulding for hot runner - Google Patents
Dynamic pressure retaining device of injection moulding for hot runner Download PDFInfo
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- CN1283440C CN1283440C CN 02128023 CN02128023A CN1283440C CN 1283440 C CN1283440 C CN 1283440C CN 02128023 CN02128023 CN 02128023 CN 02128023 A CN02128023 A CN 02128023A CN 1283440 C CN1283440 C CN 1283440C
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- hot runner
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Abstract
The present invention relates to a dynamic pressure-retaining device of injection molding for a hot runner, which is composed of a dynamic pressure-retaining injection molding die, a hydraulic pump station and a computer control system, wherein the injection molding die mainly comprises a die cavity with double pouring heads, a die cavity plate, a fixed die plate, cooling water holes on the die cavity plate and the fixed die plate, a hot runner plate, material barrels on the hot runner plate, a heater, etc.; the hydraulic pump station mainly comprises an oil pump, a three-position four-way reversing valve, a regulating valve, etc.; and the computer control system is connected with the three-position four-way reversing valve. The present invention has the characteristic of less heat consumption as a result of small volume and little heating power, and can generate a shear stress field or a tensile stress field or a tensile-shear composite stress field in the die cavity at the pressure-retaining stage of the injection molding of high molecular materials so as to change the condensed structure and the performance of molding products. The present invention can be used for producing high-performance self-reinforcing products, and can also be used for studying the high molecular physics problems of condensed structure, performance variation, etc. in an external force field for the high molecular materials.
Description
One, technical field
The present invention relates to the macromolecular material injection molding technology, particularly relate to the dynamic pressure retaining device of injection moulding for hot runner that is used for the macromolecular material processing and forming.
Two, background technology
The normal injection forming technique is widely used in the macromolecular material processing and forming.But it exists some intrinsic shortcomings:
1, the crystalline region of macromolecular material generates spherocrystal during the normal injection moulding, and the big molecule of amorphous area is disorderly to be arranged, and product strength can not show the potential mechanical property of material no more than 1% of theoretical strength under this condensed state structure;
When 2, producing the heavy wall plastic, for the big plastics of shrinkage factor, be difficult to overcome surperficial shrink mark, internal shrinkage, the plastic poor dimensional precision;
3, when processing fiber and high molecule liquid crystal reinforced composite, fiber random distribution in the matrix can not fully represent the high-modulus and the high-intensity performance of fiber or high molecule liquid crystal.
In order to overcome above shortcoming, just some new special process methods and device arise at the historic moment,, push away-La injection moulding and the injection moulding of many running channels etc. as the vibration injection moulding.In these technology, many running channels injection molding technology of being developed by the Englishman is to have substituted traditional actionless static pressurize at packing stage with dynamic pressurize, and this technology is better than traditional injection molding technology when producing the heavy wall plastic.As the Multi-Live Feed Moulding by people such as Britain P.S.Allen and B.J.Bevis development in 1992 is the multiple feed molding apparatus, cries again and shears control orientation injection molding device.BP British Patene 2170-140-13.This multiple feed molding apparatus is independent of outside the mould, and its structure is complicated, and bulky, this device can only be installed between injection machine nozzle and the injection machine solid plate.In general the position in this space is smaller, and particularly small injecting machine can't be installed this device, and small injecting machine is the maximum type of experimental study polymer morphology employing just.In addition, said apparatus needs the bulky of heating part, so heat dissipation is many.
Three, summary of the invention
Purpose of the present invention is just at the existing defective of above-mentioned multiple feed molding apparatus, the dynamic pressure retaining device of injection moulding for hot runner of a kind of monotype chamber double teeming mouth is provided, this device can cause shear stress field or trending extensional tectonic stress field at the injection molding packing stage of macromolecular material in mold cavity, or tensile shear combined stress field, thereby change the condensed state structure of moulded products, and then change the physical and mechanical property of moulded products significantly, and this device volume is little, need the heating part volume also little, heating power is little, heat dissipation then less, energy savings.
The present invention adopts following technical proposals to realize: dynamic pressure retaining device of injection moulding for hot runner of the present invention is made up of oscillating packing injection molding mould, hydraulic-driven pumping plant and computer control system three parts.Wherein the oscillating packing injection molding mould mainly comprises parts such as mold cavity plate, mold cavity, solid plate, cast gate and flow channel, barrel, hydraulic jack and oil cylinder piston: the nozzle of injection machine closely contacts with sprue in the injecting molding die; Hydraulic power unit comprises parts such as three position four-way directional control valve, flow control valve, pressure-regulating valve, oil pump, fuel tank and cooler; Computer control system is connected with three position four-way directional control valve in the hydraulic power unit.Pressurize pattern and operation program by programming software control whole system.
This device is a monotype chamber double teeming mouth hot runner mould.Cast gate in the oscillating packing injection molding mould is the double teeming mouth that is arranged on symmetric arrangement on the solid plate, in injecting molding die, be provided with hot runner manifold, be processed with two barrels of symmetric arrangement on the hot runner manifold, plunger is arranged in the barrel, plunger is connected with piston rod by shaft coupling, piston places in the hydraulic jack, hydraulic jack is installed on the cylinder bracket, each hydraulic jack is provided with hydraulic oil and imports and exports, use seal ring seal between hydraulic jack and the piston rod, two barrel bottoms are connected with an end of double teeming mouth respectively by flow channel, the other end of two cast gates is connected with the mold cavity two ends respectively, mold cavity is provided with the push rod more than two, and all push rod is fixedly clamped with push rod fixed head and liftout plate, is used for ejecting the sample or the goods of forming.
On hot runner manifold, also be provided with heater, heater is evenly distributed in the hot runner manifold, and heated plastics are heated to more than the melt temperature of plastics, mould solid plate and mold cavity plate are provided with cooling water hole, cooling water hole is disposed therein equably, in order to the injection molding goods of cooling.In addition, the pressure sensor and the temperature sensor of material are installed apart from the about 5 millimeters places of cast gate in the injecting molding die die cavity, pressure sensor and temperature sensor show or write down the interior pressure of die cavity to change and variations in temperature by external pressure indicator and the control of temperature indicator.
This device by one independently hydraulic power unit drive, the piston in the hydraulic jack on the mould is reciprocating with different mode by setup program.Flow control valve is used for regulating the control flow in the hydraulic power unit, and pressure-regulating valve is in order to regulate controlled pressure.
Computer control system is controlled by computer or single-chip microcomputer, by the dynamic pressurize scheme of the predeterminable various dynamic pressurize patterns of programming, can be as required in the operation from a kind of dynamic pressurize mode conversion to the dynamic pressurize pattern of another kind.
The sample of the die cavity of oscillating packing injection molding mould institute moulding can be samples such as dumb-bell shape, strip, square, rectangle in this device, also can be the goods of other shape.
Dynamic pressure retaining device of injection moulding for hot runner of the present invention compared with prior art has following characteristics:
1, this dynamic pressure retaining device of injection moulding for hot runner volume is little, needs the volume of heating part also little, and heating power is little, so heat dissipation is few, energy savings.
2, this dynamic pressure retaining device of injection moulding for hot runner can be at the injection molding packing stage of macromolecular material, in mold cavity, cause shear stress field or trending extensional tectonic stress field or tensile shear combined stress field, thereby change the condensed state structure of molded article, and then change the physical and mechanical property of institute's moulded products significantly.
3, this dynamic pressure retaining device of injection moulding for hot runner has overcome the surperficial shrink mark that is difficult to overcome when producing the heavy wall product, the problem of internal shrinkage.
4, this dynamic pressure retaining device of injection moulding for hot runner both can be used for producing high performance self-reinforcing goods, also can be used for studying polymer Polymer Physics such as condensed state structure and performance variation problem in external force field.
Four, description of drawings
Fig. 1 is that injecting molding die and cuing open of contacting with the injection machine nozzle thereof are shown structural representation in the dynamic pressure retaining device of injection moulding for hot runner of the present invention.
Fig. 2 is a dynamic pressure retaining device of injection moulding for hot runner of the present invention system connection diagram.
Five, the specific embodiment
Below in conjunction with accompanying drawing by structure of the present invention, the course of work and embodiment are further described.
Dynamic pressure retaining device of injection moulding for hot runner of the present invention is made up of oscillating packing injection molding mould, hydraulic-driven pumping plant and computer control system three parts.
Among Fig. 1, this device is the hot runner mould of monotype chamber double teeming mouth.Sprue 1 in the nozzle of injection machine 22 and the injecting molding die on the hot runner manifold 7 closely contacts.The cast gate 9 of oscillating packing injection molding mould is for being arranged on the double teeming mouth of symmetric arrangement on the solid plate 15, in injecting molding die, be provided with hot runner manifold 7, be processed with two barrels 20 of symmetric arrangement on the hot runner manifold 7, in two barrels plunger 19 is arranged all, two plungers 19 are reciprocating in two barrels respectively, plunger 19 is connected with piston rod 17 by shaft coupling 18, two-piston 4 places respectively in two hydraulic jacks 3, hydraulic jack 3 is installed on the cylinder bracket 2, each hydraulic jack is provided with hydraulic oil and imports and exports 5, seals with sealing ring 6 between hydraulic jack 3 and the piston rod 17.The bottom of two barrels is connected with an end of two cast gates respectively by two flow channels 8, the other end of two cast gates joins with mold cavity 14 two ends respectively, mold cavity 14 is provided with two with upper ejector pin 11, and all push rod is fixedly clamped with push rod fixed head 13 and liftout plate 12.On hot runner manifold 7, also be provided with heater 21, heater 21 is distributed in the whole hot runner manifold equably, mold cavity plate 10 and mould solid plate 15 are provided with cooling water hole 16, and cooling water hole is evenly distributed in mold cavity plate and the mould solid plate, in order to the goods of cooling institute moulding.
Among Fig. 2, hydraulic-driven pumping plant part is made of three position four-way directional control valve 23, flow control valve 24, pressure-regulating valve 25, oil pump 26 and fuel tank 27, and it is connected with injecting molding die by pipeline.The hydraulic oil that the hydraulic-driven pumping plant pumps drives the piston in the hydraulic jack on the injecting molding die, makes it reciprocating with different pressurize patterns by setup program.The pressure sensor 31 and the temperature sensor 32 of material are installed apart from cast gate 9 about 5 millimeters places in injecting molding die die cavity 14, pressure sensor and temperature sensor show or write down the interior pressure of die cavity to change and variations in temperature by external pressure indicator 29 and 30 controls of temperature indicator.
This device is by computer control system 28 controls, and computer control system 28 is connected with three position four-way directional control valve 23 in the hydraulic-driven pumping plant.By the dynamic pressurize scheme of the predeterminable various dynamic pressurize patterns of programming, can be as required in the operation from a kind of dynamic pressurize mode conversion to the dynamic pressurize pattern of another kind.
Use this device, its course of work is to be introduced into sprue 1 on the hot runner manifold 7 of injecting molding die in the injection filling mould stage by the material that injection machine 22 is come in, be divided into then two branch roads respectively the openend of the barrel 20 of two symmetric arrangement from the hot runner manifold 7 enter, material under plunger 19 effects, enters the two ends of die cavity 14 respectively again from two flow channels 8 in two barrel bottoms in barrel.Therefore must one or two be extracted into the appropriate location simultaneously in two pistons by hydraulic jack in the mold filling stage, make fused materials from injection machine 22 nozzles, can enter die cavity 14 through a flow through barrel or two barrels of flowing through simultaneously of branch road, and make die cavity 14 be full of material, drive material by driver by hydraulic cylinder piston 4 then and do reciprocal shear flow or the release of pressure of exerting pressure motion, be frozen into goods or sample fully until material, open mould then, by push rod 11, push rod fixed head 13 and liftout plate 12 teamworks eject goods or sample outside the mould.Cooling water hole 16 on mould solid plate 15 and the mold cavity plate 10 is to be used for cooling off institute's moulded products, and cooling water hole 16 makes mold cavity be in low temperature, makes the material energy cooling curing that enters die cavity.And hot runner manifold 7 utilizes heater 21 heating, makes the material in runner and the barrel be in high temperature fused state, can unimpededly flow into mold cavity.
Dynamic determining of pressurize pattern: a kind of maximum basic dynamically pressurize pattern that adopts is arranged, i.e. the two-piston one-in-and-one-out dynamic pressurize pattern of scissoring vibration of moving repeatedly in numerous dynamic pressurize patterns.In addition, also have two-piston on the hot runner manifold to be pressed into simultaneously simultaneously and extract out, the low dynamic pressurize pattern of pressure vibration when high when causing the mold cavity internal pressure.
Use this device to carry out the processing of injection molded article, adopt the dynamic pressurize pattern of scissoring vibration, raw materials used is high density polyethylene (HDPE) (HDPE), cavity pressure 0～5MPa, 180 ℃ of melt temperatures, two plungers, 19 alternately one-in-and-one-outs on hot runner manifold 7, in the two-piston 4 one when material is pressed into barrel 20, material enters die cavity 14 from a runner cast gate 9, another piston is extracted barrel out, material enters barrel 20 from another runner cast gate by die cavity 14, two-piston begins counter motion simultaneously when reaching capacity the position, does not stop and so forth, and material comes and goes to flow in die cavity and forms shear stress field, if the cross dimensions of die cavity changes, also may form trending extensional tectonic stress field or tensile shear combined stress field.Mould is opened in piston side's stop motion when the material in the die cavity is frozen into cutout gradually, ejects sample or moulded products.When adopting high density polyethylene (HDPE) (HDPE) moulding dumbbell specimen, its hot strength is brought up to 93MPa from the 26MPa of common moulding, modulus is brought up to 5GPa from 1GPa, reach tangible self-reinforcing effect, the no shrink mark in surface during the thick article of moulding 10mm, inner no shrinkage cavity obviously is better than the normal injection moulding.
This device both can be used to produce high performance self-reinforcing goods, also can be used for studying polymer Polymer Physics such as condensed state structure and performance variation problem in external force field.
Claims (4)
1. dynamic pressure retaining device of injection moulding for hot runner, be made up of oscillating packing injection molding mould, hydraulic power unit and computer control system three parts, wherein the oscillating packing injection molding mould comprises mold cavity plate (10), mold cavity (14), solid plate (15), cast gate and flow channel (8), barrel, hydraulic jack (3) and oil cylinder piston (4); Injection machine (22) nozzle closely contacts with sprue (1) in the injecting molding die; Hydraulic power unit comprises three position four-way directional control valve (23), flow control valve (24), pressure-regulating valve (25), oil pump (26), fuel tank (27) and cooler; Computer control system (28) is connected with three position four-way directional control valve in the hydraulic power unit, it is characterized in that the cast gate in the described injecting molding die is the double teeming mouth (9) that is arranged on symmetric arrangement on the solid plate (15), hot runner manifold (7) is set in the injecting molding die, two barrels (20) of symmetric arrangement are set on the hot runner manifold, the plunger (19) that is provided with in the barrel is connected with piston rod (17) by shaft coupling (18), two barrel bottoms are connected with an end of double teeming mouth respectively by runner (8), the double teeming mouth other end is connected with mold cavity (14) two ends respectively, push rod (11) more than two is set on the mold cavity, and push rod is fixedly clamped with fixed head (13) and liftout plate (12).
2. according to the described device of claim 1, it is characterized in that being provided with in the described hot runner manifold (7) equally distributed heater (21).
3. according to the described device of claim 1, it is characterized in that being provided with equally distributed cooling water hole (16) in described cavity plate (10) and the solid plate (15).
4. according to the described device of claim 1, it is characterized in that in mold cavity (14), locate to install material pressure sensor (31) and temperature sensor (32) apart from arbitrary double teeming mouth (9) about 5 millimeters, show by external pressure indicator (29) and temperature indicator (30), and with pressure signal and temperature signal input computer control system, control goods external morphology change procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128023 CN1283440C (en) | 2002-12-13 | 2002-12-13 | Dynamic pressure retaining device of injection moulding for hot runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128023 CN1283440C (en) | 2002-12-13 | 2002-12-13 | Dynamic pressure retaining device of injection moulding for hot runner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1507999A CN1507999A (en) | 2004-06-30 |
| CN1283440C true CN1283440C (en) | 2006-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02128023 Expired - Fee Related CN1283440C (en) | 2002-12-13 | 2002-12-13 | Dynamic pressure retaining device of injection moulding for hot runner |
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| Country | Link |
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| CN (1) | CN1283440C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264654B (en) * | 2007-08-06 | 2010-05-19 | 广东工业大学 | Inner vibration sequence injection molding die device and injection molding technique thereof |
| CN102107488A (en) * | 2010-11-23 | 2011-06-29 | 武汉市今晨实业有限公司 | Method for producing toothbrush handle by injection molding for twice |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107487A (en) * | 2010-11-23 | 2011-06-29 | 武汉市今晨实业有限公司 | Method for producing brush holder of tooth brush |
| CN103264480A (en) * | 2013-05-29 | 2013-08-28 | 昆山市润苏物资有限公司 | Porous cooling water inlet hole injection mould |
| CN103552225B (en) * | 2013-10-28 | 2015-11-25 | 郑州大学 | Transparent article injection compression molding process internal stress distribution real-time detection method |
| CN106965398B (en) * | 2017-04-16 | 2018-03-13 | 鹰星精密工业（深圳）有限公司 | A kind of plastic mould for being used to produce mobile phone and power supply adaptor |
| WO2023092247A1 (en) * | 2021-11-23 | 2023-06-01 | 朱建伟 | Pressurization-type injection molding machine having external oil cylinder |
-
2002
- 2002-12-13 CN CN 02128023 patent/CN1283440C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264654B (en) * | 2007-08-06 | 2010-05-19 | 广东工业大学 | Inner vibration sequence injection molding die device and injection molding technique thereof |
| CN102107488A (en) * | 2010-11-23 | 2011-06-29 | 武汉市今晨实业有限公司 | Method for producing toothbrush handle by injection molding for twice |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1507999A (en) | 2004-06-30 |
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Granted publication date: 20061108 Termination date: 20111213 |