CN204414468U - Thermoplastic resin hollow tube goods injection molding system - Google Patents
Thermoplastic resin hollow tube goods injection molding system Download PDFInfo
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- CN204414468U CN204414468U CN201520067363.7U CN201520067363U CN204414468U CN 204414468 U CN204414468 U CN 204414468U CN 201520067363 U CN201520067363 U CN 201520067363U CN 204414468 U CN204414468 U CN 204414468U
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Abstract
The utility model is a kind of thermoplastic resin hollow tube goods injection molding system, relates to the device of polymer material molding technical field, specifically a kind of water aided injection forming system.Primarily of injection machine (100), current injection control device (200), mould (1), be arranged on the water needle device (3) in mould (1), and connect the pipeline composition of current injection device (200) and water needle device (3), the utility model has the advantages that, application the technical solution of the utility model, not only can eliminate the risk solving liquid drugs injection blocking, and loose/shrinkage cavity defect risk in goods can be eliminated to the control of melten gel pressure in product molding process die cavity, the energy consumption in manufacture process and scrap piece loss can also be reduced, and obtain evenly hollow tube latus rectum.
Description
Technical field
The utility model relates to the device of polymer material molding technical field, specifically a kind of water aided injection forming system.
Background technology
Water-assisted Injection Molding, is a kind of control fluid (water), is injected into the specific melt region of product to form hollow technology.Utilize liquid drugs injection to its core injection water after injection molten thermoplastic melt, the forward position of water acts on the molten core of product, and the changeover portion from the forward position of water to melt have cured the plastic foil that one deck is very thin, promote polymer melt, filling mold cavity is to obtain hollow product.Compared with gas assisted Injection Molding Technology, the advantages such as water aided injection forming has cool time and molding cycle is shorter, production efficiency increase.
But be also very easy in the resin cross section of the hollow product of water shaping at discovery shrinkage cavity or shrinkage defect, and the incomplete defect of goods filling in die cavity.This is mainly because the difference of the physical characteristic of foaming with gas medium (being generally high pressure nitrogen) used and water aided injection forming medium (water) used causes, such as when gas assistant injection molding, when high pressure nitrogen promotes melten gel formation hollow because the thermal capacity of nitrogen is low, the inwall of hollow can not solidify immediately, but cool from the goods outer wall contacted with mold cavity wall to hollow wall, simultaneously because nitrogen has compressibility, namely nitrogen has the bulbs of pressure to promote melten gel to mould to die cavity wall motion complementary contraction with fully fill die cavity, even if adopt the defects such as high pressure nitrogen pressurize operation also can eliminate shrinkage porosite and cavity filling is incomplete after completing hollow molding, and when adopting water shaping, thermal conductivity due to water is 40 times of nitrogen, the thermal capacity of water is 4 times of nitrogen, the inwall of ducted body can form hard cured layer rapidly, the outer wall meanwhile contacted with mold cavity wall also forms hard cured layer rapidly under the cooling of mould, but glassware for drinking water has Incoercibility, in injection process, do not have enough resistances just can not form enough hydraulic pressure to act on resinite if meaned, after coagulation part between two-layer hard cured layer is so just caused to produce the defect such as shrinkage cavity or shrinkage porosite, and can not promote not solidify the thin-wall construction in the complete filling die cavity of melten gel.
For the incomplete defect of goods filling in die cavity, when melten gel fills die cavity, adopting known screw rod pressurize and material overflow cavity process first mold cavity fully to be filled molten thermoplastic resin, then with water, not solidified for core molten thermoplastic resin to be pushed material overflow cavity be a kind of feasible method; But adopt the risk that still there are two aspects when manufacturing in this way, one of them is that water filling liquid drugs injection is easily blocked by melten gel when starting water filling, thus impact manufactures efficiency; Another one risk is in flash process in material overflow cavity, and melten gel insufficient pressure in die cavity, can not solve the shrinkage porosite/Shrinkage Problem produced in goods wall in forming process completely; Simultaneously this method also can produce a large amount of flashes, causes that power consumption of polymer processing is higher or material consumption is too many.
Utility model content
The utility model object is the weak point according to above-mentioned existing water shaping hollow product, proposes a kind of thermoplastic resin hollow tube goods injection molding system.
The utility model primarily of injection machine 100, current injection control device 200, mould 1, be arranged on water needle device 3 in mould 1 and connect the pipeline composition of current injection device 200 and water needle device 3, wherein said mould 1 comprise closed after die cavity 2, hot-runner device 4, controlled flash cylinder assembly 5, the check valve 6 between controlled flash cylinder assembly 5 and hot-runner device, the first switch valve 8 between controlled flash cylinder assembly 5 and die cavity 2, the second switch valve 9 between hot-runner device 4 and die cavity 2 of shaping hollow tube goods 10 that are formed, wherein, controlled flash cylinder assembly 5 comprises heating and temperature control assembly 5a, piston 5b, flash cylinder 5d, drive and controlling organization 5c, flash cylinder 5d sets by driving and controlling organization 5c and controls minimum storing volume V0 and maximum storing volume V1, flash cylinder 5d is connected to receive the molten thermoplastic resin of overflowing from die cavity 2 until maximum storing volume V1 with die cavity 2 by the first switch valve 8, flash cylinder 5d is connected in die cavity 2, to inject stored molten thermoplastic resin until minimum storing volume V0 by hot-runner device 4 and second switch valve 9 by check valve 6 with hot-runner device 4, wherein, water needle device 3 comprises water passage 3a, current output 3b and liquid drugs injection cap 3c, one end of described water passage 3a is connected with current injection control device 200 by pipeline, the other end of water passage 3a is positioned at current output 3b, liquid drugs injection cap 3c and current output 3b is for removably connecting, before injection current are exported by current output 3b, described current output 3b and liquid drugs injection cap 3c is arranged in die cavity 2, liquid drugs injection cap 3c to be fixed on current output 3b and to cover the delivery port of current output 3b, when the current injected are exported by current output 3b, described liquid drugs injection cap 3c departs from current output 3b under the effect of injecting current, wherein, in the flash cylinder 5d of controlled flash cylinder assembly, the pressure of molten thermoplastic resin is by drive and controlling organization 5c sets and controls.
The utility model has the advantages that, application the technical solution of the utility model, not only can eliminate the risk solving liquid drugs injection blocking, and loose/shrinkage cavity defect risk in goods can be eliminated to the control of melten gel pressure in product molding process die cavity, the energy consumption in manufacture process and scrap piece loss can also be reduced, and obtain evenly hollow tube latus rectum.
Accompanying drawing explanation
Fig. 1 the utility model formation system structural representation;
Step schematic diagram when Fig. 2 the utility model system is shaping;
Water needle device schematic diagram in Fig. 3 the utility model;
Flash cylinder assembly schematic diagram in Fig. 4 the utility model;
Step schematic diagram when Fig. 5 the utility model system is shaping;
Step schematic diagram when Fig. 6 the utility model system is shaping;
Step schematic diagram when Fig. 7 the utility model system is shaping.
Detailed description of the invention
Below in conjunction with accompanying drawing by specific embodiments, technical characteristic of the present utility model and the special spy of correlation technique thereof are further elaborated:
As accompanying drawing 1-7 illustrates, label in figure represents respectively: 1 – mould, 2 – mold cavities, 3 – water needle devices, 3a – water passage, 3b – current output, 3c – liquid drugs injection cap, 4 – hot-runner devices, the controlled flash cylinder assembly of 5 –, 5a – temperature control assembly, 5b – piston, 5c – drives and controlling organization, 5d – flash cylinder, 6 – check valves, 7 – resinites, 8 – first switch valves, 9 – second switch valves, 10 – hollow tube goods, 10a – goods external connecting structure, 10b – technique clout, 100 – injection machines, 101 – plastify injecting unit, 200 – current injection control devices.
Hollow tube goods 10 as shown in Figure 7 are a kind of coolant hoses, comprise external connecting structure 10a, and material is 30% glass fiber enhanced nylon
66(PA66 GF30), resin density is 1.35g/cm
3, wherein, this water pipe external diameter is Φ 20mm, expects that internal diameter is Φ 15 mm ± 0.5mm.
Be the injection molding system according to technical solutions of the utility model structure and mould structure layout as depicted in figs. 1 and 2.Injection machine 100 is wherein injection machine common in commodity market, current injection control device 200 is that the utility model people makes by oneself, and PLC technology injects the volume flow rate of water and each cumulative volume injected, and provides output supercharging power, mould 1 is wherein arranged on injection machine 100, the plasticizing injecting unit 101 of injection machine is connected with the hot-runner device entrance in mould 1, the die cavity 2 of moulded products is had after mould closes, when hot-runner device 4 in mould 1 to be connected with mold cavity 2 to control to inject molten thermoplastic resin and prevent water filling in die cavity 2 by second switch valve 9, melten gel or water enter glue end from die cavity and turn back to hot flow path, and the flash cylinder 5d in controlled flash cylinder assembly is connected break-make from die cavity 2 to the molten thermoplastic resin that flash cylinder 5d overflows that control to flow from die cavity 2 by the first switch valve 8, wherein the first switch valve 8 and second switch valve 9 can be needle-valve type hot nozzles common in commodity market, for realizing technical purpose of the present utility model, controlled flash cylinder assembly 5 adopts a kind of piston cylinder structure, comprises driving and controlling organization 5c, piston 5b and temperature control assembly 5a and the flash cylinder 5d that formed by piston 5b and cylinder body, as shown in Figure 4, can set the position with control piston 5b by driving and controlling organization 5c, form the minimum storing volume V0 of flash cylinder 5d and maximum storing volume V1, wherein minimum storing volume V0 can be 0, the flash cylinder 5d of controlled flash cylinder assembly 5 is connected with hot-runner device by a check valve 6, drive and controlling organization 5c driving under, the molten thermoplastic resin stored in permission flash cylinder 5d exports in hot-runner device 4 until the minimum storing volume V0 that sets, and when opening the first switch valve 8, allow the molten thermoplastic resin of overflowing from die cavity 2 to overflow under a certain pressure flash cylinder 5d until return to the maximum storing volume V1 of setting, temperature control assembly 5a wherein makes the connecting path between the connecting path between the flash cylinder of flash cylinder assembly 5, the first switch valve 8 to flash cylinder 5d and flash cylinder 5d to hot-runner device 4 remain on the temperature of setting, and ensures that resin is wherein molten condition, in this specific embodiment, for eliminating the risk that water needle device is blocked by colloidal sol, adopt a kind of water needle device of particular design, have water passage 3a, current output 3b and liquid drugs injection cap 3c, structure as shown in Figure 3, one end of the water passage 3a of water needle device is connected by the delivery outlet of pipeline with current injection control device, and the other end of aquaporin 3a is positioned at the top of current output, and delivery port is in the center of current output 3b, water needle device is fixed on mould 1, and current output 3b is wherein arranged in the die cavity 2 of mould, and liquid drugs injection cap 3c and current output 3b is for removably connecting, before matched moulds, liquid drugs injection cap 3c to be placed on current output 3b and to cover the delivery port of current output 3b, after matched moulds, liquid drugs injection cap 3c and liquid drugs injection output 3b is arranged in die cavity 2 in the lump, and completely coated by the molten thermoplastic resin of follow-up injection, with one end of the common shaping hollow tube goods 10 of mold cavity wall, when the current injected are exported by current output 3b, liquid drugs injection cap 3c departs from current output 3b under the effect of injection current, and under the effect of follow-up current, promotes the not solidified molten thermoplastic resin of resinite 7 core in die cavity overflow in flash cylinder, for the processing capacity that the hollow space of complete shaping hollow tube goods 10 is follow-up with minimizing, in die cavity, the current injected need to arrive and exceed the other end of hollow tube, one section of boot segment is set in the mold cavity 2 of the shaping hollow tube goods other end for this reason, namely the technique clout section 10b shown in shaping Fig. 7, to receive current and to be pushed away the liquid drugs injection cap 3c come by current, and be connected with aforesaid first switch valve 8 at the end of boot segment, for improving shaping efficiency and being convenient to reclaim, liquid drugs injection cap used in this specific embodiment is disposable liquid drugs injection cap, and its material is identical with the material of shaping hollow tube goods 10, is the nylon66 fiber of 30% fiberglass reinforced, can be shaping by injection molding, and pass through shape and the size of choose reasonable liquid drugs injection cap, the uniformity of the very all even height of internal diameter size of shaping hollow tube goods.Be connected to form complete injection molding system in the manner described above, and injection machine plastified hot-runner device in injecting unit, mould according to the physical characteristic of processed resin (30% glass fiber enhanced nylon 66) and controlled flash cylinder assembly temperature is set in a suitable processing temperature (such as 300 DEG C) keeping thermoplastic resin to be in molten condition, and the maximum storing volume of flash cylinder and minimum storing volume are set, the temperature of die ontology is set in applicable shaping temperature (such as 90 DEG C).When first application injection forming mold of the present utility model, can in flash cylinder, set up storing by following manner and determine maximum storing volume V1, and relevant parameter is adjusted: liquid drugs injection cap 3c is placed at the current output 3b top of water needle device 3, close die, close the first switch valve 8, open the second open pipe valve 9; Use the plasticizing injecting unit 101 of injection machine to inject enough molten resins in die cavity 2, make to fill up molten resin completely in die cavity 2; Then close second switch valve 9, open the first switch valve 8, current injection control device 200 injects water by water needle device by a water velocity set and water filling volume in the molten resin body 7 in die cavity 2; Liquid drugs injection cap 3c departs from current output 3b under the promotion of injecting water, and under the promotion of follow-up injection current, the melten gel that do not solidify of die cavity 2 resinite is pushed into flash cylinder assembly 5, thus sets up storing in flash cylinder 5d; The storing set up in flash cylinder can be injected into mold cavity when next mould injection mo(u)lding with plastifying from injection machine together with molten resin that injecting unit injects again; By checking that the state of hollow tube goods 10 is as the diameter of hollow hole, the packing of goods wall and intensity etc., and the final stop position of liquid drugs injection cap 3c, the suitable pressure of melten gel in flash cylinder when determining maximum storing volume and the flash of flash cylinder, and melten gel pressure when the maximum storing volume (or position of piston) of flash cylinder and flash is set, the parameter such as waterflood injection rate, water filling cumulative volume of current injection control device 200 is determined and set simultaneously.Because the volume of mold cavity 2 is determined, when after the maximum storing volume by said method determination flash cylinder, the injecting glue amount that injection machine plasticizing injecting unit is each can be determined.After completing and setting up storing and determine maximum storing volume and minimum storing volume in flash cylinder 5d, can according to the forming method comprised the following steps shaping hollow tube goods:
1) the liquid drugs injection cap 3c of water needle device to be placed on current output 3b and to cover the delivery port of the 3b of current output, then close die; Now, the water passage 3a of water needle device 3 is in closed condition, the first switch valve 8 and second switch valve 9 all in the closed position, flash cylinder 5d has maximum storing volume V1;
2) second switch valve 9 is opened, the plasticizing injecting unit 101 of injection machine 100 and controlled flash cylinder assembly 5 inject molten thermoplastic resin jointly in die cavity 2 makes die cavity 2 fully fill, and it is completely coated that the current output 3b of water needle device and liquid drugs injection cap 3c is melted resin; After die cavity 2 is filled, flash cylinder 5d reaches the minimum storing volume V0 preset;
3) second switch valve 9 is closed, open the water passage 3a of the first switch valve 8 and water needle device 3, current injection control device 200 injects water by the current output 3b of water needle device according to the waterflood injection rate preset and volume in the molten resin body in die cavity 2, the liquid drugs injection cap 3c of water needle device departs from current output 3b and promotes not solidified molten resin in resinite and spills in flash cylinder 5d by the first switch valve 8 under the thrust of water, forms the inwall of hollow tube goods; In the process, the molten thermoplastic resin in flash cylinder 5d is by driving the pressure controlling with controlling organization 5c to preset at one;
4) after completing the water injecting predetermined, stop water filling and close the first switch valve 8; Now, flash cylinder 5d returns to the maximum volume V1 preset;
5) water being injected into hollow tube goods hollow space is discharged by conducting oneself with dignity or vaporizing from the water passage 3a of water needle device; Then the water passage 3a of water needle device is closed;
6) die sinking pickup, removes technique clout and the liquid drugs injection cap 3c be included in wherein obtains hollow tube goods 10.
According to the forming method comprising above-mentioned steps, continuous seepage 50 mould, do not find the situation that water needle device is blocked by melten gel, the abundant copy mold die cavity of goods, by dissecting goods and sampling on made goods, do not find have loose and shrinkage cavity defect in goods wall, the indexs such as intensity meet design requirement, the internal diameter of hollow hole is better than design tolerance within Φ 15 mm ± 0.2mm, and the technique clout amount simultaneously produced greatly reduces.
Although below done to elaborate to the design according to the utility model object with reference to accompanying drawing; but those skilled in the art will recognize that; under the precondition not departing from claim limited range; still can make various improvement and conversion to the utility model, and this improvement and conversion still should belong to protection domain of the present utility model.
Claims (1)
1. a thermoplastic resin hollow tube goods injection molding system, it is characterized in that, primarily of injection machine (100), current injection control device (200), mould (1), be arranged on the water needle device (3) in mould (1), and connect the pipeline composition of current injection device (200) and water needle device (3), wherein said mould (1) comprises the die cavity (2) of the closed rear shaping hollow tube goods (10) formed, hot-runner device (4), controlled flash cylinder assembly (5), check valve (6) between controlled flash cylinder assembly (5) and hot-runner device, the first switch valve (8) between controlled flash cylinder assembly (5) and die cavity (2), second switch valve (9) between hot-runner device (4) and die cavity (2), wherein, controlled flash cylinder assembly (5) comprises heating and temperature control assembly (5a), piston (5b), flash cylinder (5d), drive and controlling organization (5c), flash cylinder (5d) sets and controls minimum storing volume V0 and maximum storing volume V1 by driving and controlling organization (5c), flash cylinder (5d) is connected to receive the molten thermoplastic resin of overflowing from die cavity (2) until maximum storing volume V1 by the first switch valve (8) with die cavity (2), flash cylinder (5d) by check valve (6) to be connected with hot-runner device (4) with by hot-runner device (4) and second switch valve (9) to die cavity (2) is middle inject stored by molten thermoplastic resin until minimum storing volume V0, wherein, water needle device (3) comprises water passage (3a), current output (3b) and liquid drugs injection cap (3c), one end of water passage (3a) is connected with current injection control device (200) by pipeline, the other end of water passage (3a) is positioned at current output (3b), liquid drugs injection cap (3c) and current output (3b) are for removably connecting, before the current injected are exported by current output (3b), current output (3b) and liquid drugs injection cap (3c) are arranged in die cavity (2), liquid drugs injection cap (3c) is fixed on current output (3b) and goes up and cover the delivery port of current output (3b), when the current injected are exported by current output (3b), described liquid drugs injection cap (3c) departs from current output (3b) under the effect of injecting current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520067363.7U CN204414468U (en) | 2015-01-31 | 2015-01-31 | Thermoplastic resin hollow tube goods injection molding system |
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| CN201520067363.7U CN204414468U (en) | 2015-01-31 | 2015-01-31 | Thermoplastic resin hollow tube goods injection molding system |
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| CN204414468U true CN204414468U (en) | 2015-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104552745A (en) * | 2015-01-31 | 2015-04-29 | 长春中拓模塑科技有限公司 | Injection molding system for thermoplastic resin hollow tube products |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104552745A (en) * | 2015-01-31 | 2015-04-29 | 长春中拓模塑科技有限公司 | Injection molding system for thermoplastic resin hollow tube products |
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