CN103331873A - Low pressure injection mold and injection method - Google Patents
Low pressure injection mold and injection method Download PDFInfo
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- CN103331873A CN103331873A CN2013103127052A CN201310312705A CN103331873A CN 103331873 A CN103331873 A CN 103331873A CN 2013103127052 A CN2013103127052 A CN 2013103127052A CN 201310312705 A CN201310312705 A CN 201310312705A CN 103331873 A CN103331873 A CN 103331873A
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Abstract
The invention discloses a low pressure injection mold, which comprises a fixed mold and a moving mold, wherein the moving mold comprises a base plate, a cavity fixedly formed on the base plate, and a plurality of cloth hanging pins arranged at the periphery of the cavity; the outer sides of the cloth hanging pins are provided with blade structures, so that a fabric is cut apart when strained; the fixed mold comprises a panel, a hot runner plate fixedly connected with the panel, a core fixedly connected with the hot runner plate, an ejection mechanism and a hot nozzle; the periphery of a lug of the core is provided with through holes corresponding to the cloth hanging pins to avoid interference; and the periphery of the lug is provided with a plurality of cloth pressing mechanisms. The invention also discloses an injection method. The mold is inversely mounted, the cavity is taken as the moving mold, the core is taken as the fixed mold, and glue feed and ejection are carried out on the same fixed mold side of the mold; meanwhile, the locating pins are provided with blades, so that the fabric can be cut apart when strained, and cannot be deformed because the fabric is strained too much.
Description
Technical field
The present invention relates to the machine die technical field, particularly relate to a kind of mould and injection moulding process that can simultaneously fabric be connected with its injection moulding in the working of plastics injection mo(u)lding.
Background technology
Middle and high end, market car sales volume sustainable growth at home, high-quality high-end product demand will constantly increase, and the environment protection health theory is in fashion, the automotive trim product also begins leading green concept, the environment protection health series products will be a main trend of development of automobile, improve the room fit one's leisure and exercise demands design in the car, improve the comfortableness of taking, also widely adopted by medium-to-high grade car.
Traditional automobile A, B post formation process are, are to use the Mold Making moulding with A, B post plastic part at first, then by manually with coating viscosity glue on the working of plastics, bond with nonwoven and working of plastics again, at last unnecessary nonwoven is pruned away to finish this work.This process need carries out three step operations to be finished, the one, injection mo(u)lding, the 2nd, coating viscosity glue covers nonwoven, the 3rd, prune nonwoven, in this process, will use harmful toxic solvent, not only harmful to the operating personnel that are coated with coating viscosity glue, also exist problem such as air pollution to take place simultaneously, it is narrow and small to add the automobile interior space, cause the more serious of in-vehicle air pollution and peculiar smell, simultaneously, coating viscosity glue again behind plastic piece shaping makes nonwoven many with the operation that working of plastics is pasted together, need personnel also many, long processing time, and the quality instability of pasting form the expensive production model of low quality.Simultaneously, aforesaid operations is finished by artificial streamline, so each workman has just determined that to the qualification difference of working the quality of product is inconsistent.
For addressing the above problem, the someone has proposed fabric or the nonwoven theory that injection moulding is connected with working of plastics, and this just needs a kind of mould that can be in the process of plastic piece shaping fabric or nonwoven injection moulding be connected.Also need simultaneously to provide a kind of this mould that can utilize to realize the method that fabric is connected with the working of plastics injection moulding.
Summary of the invention
The objective of the invention is at the technological deficiency that exists in the prior art, and a kind of low-pressure injection molding mould and injection moulding process thereof that can simultaneously fabric be connected with its injection moulding in the working of plastics injection mo(u)lding is provided.
For realizing that the technical scheme that purpose of the present invention adopts is:
A kind of low-pressure injection molding mould, comprise fixed half and moving half, described dynamic model comprises base plate, is fixedly installed on the die cavity on the described base plate, and a plurality of dossal pins that are arranged on the die cavity periphery, the outside of described dossal pin is formed with edge structure in order to when fabric is subjected to tension force it is severed; Described cover half comprises panel, the hot runner manifold of fixedlying connected with described panel, the core of fixedlying connected with described hot runner manifold, and ejecting mechanism and Re Zui, be provided with described dossal in the periphery of described core projection and interfere avoiding at the through hole of answering, also be provided with a plurality of pressers at described projection periphery.
Described presser comprises several grooves that are arranged on the core periphery, can be contained in the briquetting of described inside grooves and be arranged on groove and briquetting between be used for when pressurized not, described briquetting outer end being ejected the ejector spring of groove.
Described dossal pin is the triangle cone structure.
A kind of injection moulding process that adopts low-pressure injection molding mould as claimed in claim 1 may further comprise the steps,
1) utilize manipulator cloth to be installed on the dossal pin of dynamic model;
2) injection machine matched moulds, cloth can touch the cover half core earlier, and cloth can and paste core and move along with the distortion of the present situation of core, and when mould was closed into preset distance, the presser that is fixed on the cover half side can be pushed down cloth earlier,
3) continue close die until the gap of die joint at 1/3rd to 1/2nd of fabric thickness;
4) carry out injection mo(u)lding and the demoulding and get material.
Moulding is A post or the B post of automobile, described fabric comprises the nonwoven layer that is connected with the working of plastics injection moulding and the tissue layer of fixedlying connected with described nonwoven layer, described fabric thickness is at 1.2-1.4mm, and described tissue layer thickness is at 0.4-0.6mm, and described nonwoven layer thickness is at 0.6-1mm, during injection moulding, clamp force is 600-800T, maximum injection pressure 2-4bar, and pressure switches to 2-4bar, injection time is 3-5s, and the dwell time is 13-16s.
Compared with prior art, the invention has the beneficial effects as follows:
Mould of the present invention adopts the upside-down mounting mode, and as dynamic model, core is as cover half with die cavity, advance glue and eject in the same cover half side of mould, simultaneously design blade in pilot pin, can sever fabric when realizing the fabric tension, guarantee that fabric can be because tightly not being out of shape by La Detai; Be placed in the mould in order to guarantee that fabric is unruffled, cover half is provided with uses presser, and behind setpoint distance, cloth can touch the cover half core earlier at the mould matched moulds, and cloth can and paste core and move along with the distortion of the present situation of core.When mould was closed into 15 millimeters, the bullet piece that is fixed on the cover half side can be pushed down cloth earlier, made the cloth can wrinkling close die; The injected plastic moulding guarantees product quality and outward appearance then.
Adopt injection moulding process of the present invention to prepare automotive upholstery, the direct injection moulding of working of plastics and fabric is connected, effectively avoided the too much use of glue, the operation that one-shot forming simultaneously is pasted together plastic cement and nonwoven, saved secondary processing process, beautiful, the environmental protection of the appearance of the automotive upholstery of made, and improved production efficiency greatly.
Description of drawings
Figure 1 shows that mould matched moulds pre-structure schematic diagram of the present invention;
Figure 2 shows that structural representation in the mould matched moulds of the present invention;
Figure 3 shows that structural representation behind the mould matched moulds of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
As Figure 1-3, of the present invention for the mould that simultaneously fabric is connected with its injection moulding in the working of plastics injection mo(u)lding, comprise dynamic model 1 and cover half 2, wherein said dynamic model comprises base plate 11, be fixedly installed on the die cavity 12 on the described base plate, and a plurality of dossal pins 14 that are arranged on the die cavity periphery, described die cavity center is provided with default cavity 13, described cavity is the profile of injection mo(u)lding, described dossal pin be arranged on cavity periphery in case with fabric is supported.Because fabric 3 time is flat hanging over outside the cavity on the side plane in beginning, fabric can be pressed in the cavity of die cavity when matched moulds, drawn too tight and be out of shape for fear of fabric, the outside of described dossal pin is formed with edge structure in order to when fabric is subjected to tension force it is severed, preferably, described dossal pin is the triangle cone structure, and the dossal pin of triangle taper can effectively guarantee dossal and cut carrying out smoothly of cloth action.
Described cover half 2 comprises panel 21, the hot runner manifold 22 of fixedlying connected with described panel, the core 23 of fixedlying connected with described hot runner manifold, and ejecting mechanism 24 and hot mouth 25, design and the prior art of described panel, hot runner manifold ejecting mechanism and hot mouth are similar, do not repeat them here.
Described core 23 middle parts are formed with the projection 26 with described die cavity coupling, and the space behind the projection insertion cavity namely constitutes the face shaping of moulding after injection moulding.The design consideration different product specification of cavity and projection and having nothing in common with each other is no longer launched to describe at this.Be provided with described dossal in the periphery of described core projection and interfere avoiding at the through hole of answering or groove, simultaneously in order to improve the control to fabric, also be provided with a plurality of pressers at described projection periphery, described presser comprises the groove 27 that is arranged on the core, can be contained in the briquetting 28 of described inside grooves and be arranged on groove and briquetting between be used for when pressurized not, described briquetting outer end being ejected the ejector spring 29 of groove.When matched moulds arrives preset distance, briquetting can hold the cavity periphery of die cavity with its acting in conjunction clamping cloth, what fabric was severed when the briquetting that utilizes flexible power to support can guarantee matched moulds is stable, namely maintains predetermined tension force and can not be out of shape again, guarantees that fabric is fitted on the core.
Mould of the present invention adopts the upside-down mounting mode, and as dynamic model, core is as cover half with die cavity, advance glue and eject in the same cover half side of mould, simultaneously design blade in pilot pin, can sever fabric when realizing the fabric tension, guarantee that fabric can be because tightly not being out of shape by La Detai; Be placed in the mould in order to guarantee that fabric is unruffled, cover half is provided with uses presser, and behind setpoint distance, cloth can touch the cover half core earlier at the mould matched moulds, and cloth can and paste core and move along with the distortion of the present situation of core.When mould was closed into 15 millimeters, the bullet piece that is fixed on the cover half side can be pushed down cloth earlier, made the cloth can wrinkling close die; The injected plastic moulding guarantees product quality and outward appearance then.
Adopt the mould one-shot forming demoulding of the present invention smooth and easy, and adopt low-pressure injection molding technology in the working of plastics injection mo(u)lding, it to be connected with the fabric injection moulding in the lump, finish moulding and the combination of fabric and plasthetics at mould inside, thereby improved the input that production efficiency has reduced human cost greatly, and because be mould production, so each Products Quality is the same; Low-pressure injection molding technology has lacked the application to glue simultaneously, so the pollution of goods environment is zero.Specifically, plastic cement and nonwoven adopt low pressure injection formaing technology, be that plastics are adhered to each other by mold injection and nonwoven, the product adhesive force that produces is very strong, will never come off and ftracture in the use, and nonwoven is a decorative layer on automobile product surface, also has good surface abrasion resistance simultaneously.Because not needing to add any alite paste by being injected into after the plastics high temperature melting behind the mold cavity in the speed cooling and the bonding process of nonwoven, can stop the alite paste smell and produce workshop environmental issue and the environmental issue of automotive trim when producing.
The A post or the B post that with the moulding are automobile below further specify injection moulding process of the present invention: described fabric comprises the nonwoven layer that is connected with the working of plastics injection moulding and the tissue layer of fixedlying connected with described nonwoven layer, described fabric thickness is at 1.2mm, described tissue layer thickness is at 0.5mm, described nonwoven layer thickness is at 0.7mm
May further comprise the steps,
1) utilize manipulator cloth to be installed on the dossal pin of dynamic model;
2) injection machine matched moulds, cloth can touch the cover half core earlier, and cloth can and paste core and move along with the distortion of the present situation of core, and when mould was closed into 15mm, the presser that is fixed on the cover half side can be pushed down cloth earlier,
3) continue close die until the gap of die joint at 0.4mm; The die joint of common die needs tight the cooperation, and low head injection mould of the present invention, can not tightly cooperate so die joint needs design gaps because fabric being arranged on mould.Gap length is very much problem, has stayed and has produced batch peak, stays to have lacked and damages fabric by pressure, is advisable with 0.4mm for present embodiment.
4) carry out injection mo(u)lding and the demoulding and get material, wherein, clamp force is 700T, maximum injection pressure 3bar; Pressure switches 3bar, injection time 4s, dwell time 15s.
Adopt mould of the present invention to make automotive upholstery by low pressure injection formaing technology, injection moulding is connected with fabric with working of plastics, effectively avoided the too much use of glue, the operation that one-shot forming simultaneously is pasted together plastic cement and nonwoven, saved secondary processing process, beautiful, the environmental protection of the appearance of the automotive upholstery of made, and improved production efficiency greatly.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. low-pressure injection molding mould, it is characterized in that, comprise fixed half and moving half, described dynamic model comprises base plate, be fixedly installed on the die cavity on the described base plate, and a plurality of dossal pins that are arranged on the die cavity periphery, the outside of described dossal pin is formed with edge structure in order to when fabric is subjected to tension force it is severed; Described cover half comprises panel, the hot runner manifold of fixedlying connected with described panel, the core of fixedlying connected with described hot runner manifold, and ejecting mechanism and Re Zui, be provided with described dossal in the periphery of described core projection and interfere avoiding at the through hole of answering, also be provided with a plurality of pressers at described projection periphery.
2. low-pressure injection molding mould as claimed in claim 1, it is characterized in that, described presser comprises several grooves that are arranged on the core periphery, can be contained in the briquetting of described inside grooves and be arranged on groove and briquetting between be used for when pressurized not, described briquetting outer end being ejected the ejector spring of groove.
3. low-pressure injection molding mould as claimed in claim 1 or 2 is characterized in that, described dossal pin is the triangle cone structure.
4. an injection moulding process that adopts low-pressure injection molding mould as claimed in claim 1 is characterized in that, may further comprise the steps,
1) utilize manipulator cloth to be installed on the dossal pin of dynamic model;
2) injection machine matched moulds, cloth can touch the cover half core earlier, and cloth can and paste core and move along with the distortion of the present situation of core, and when mould was closed into preset distance, the presser that is fixed on the cover half side can be pushed down cloth earlier,
3) continue close die until the gap of die joint at 1/3rd to 1/2nd of fabric thickness;
4) carry out injection mo(u)lding and the demoulding and get material.
5. injection moulding process as claimed in claim 4, it is characterized in that, moulding is A post or the B post of automobile, described fabric comprises the nonwoven layer that is connected with the working of plastics injection moulding and the tissue layer of fixedlying connected with described nonwoven layer, described fabric thickness is at 1.2-1.4mm, described tissue layer thickness is at 0.4-0.6mm, described nonwoven layer thickness is at 0.6-1mm, during injection moulding, clamp force is 600-800T, maximum injection pressure 2-4bar, and pressure switches to 2-4bar, injection time is 3-5s, and the dwell time is 13-16s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310312705.2A CN103331873B (en) | 2013-07-23 | 2013-07-23 | Low pressure injection mould and injection moulding process |
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| CN201310312705.2A CN103331873B (en) | 2013-07-23 | 2013-07-23 | Low pressure injection mould and injection moulding process |
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| CN103331873A true CN103331873A (en) | 2013-10-02 |
| CN103331873B CN103331873B (en) | 2015-10-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106426743A (en) * | 2016-10-07 | 2017-02-22 | 吉林省华翼汽车零部件有限公司 | Low-pressure injection molding backrest protecting plate |
| CN106671349A (en) * | 2017-01-03 | 2017-05-17 | 陆宇 | Thermoplastic elastomer in-die cloth patching one-time injection molding process and plastic product |
| CN106808646A (en) * | 2015-12-02 | 2017-06-09 | 佛山市顺德区美的电热电器制造有限公司 | Perforated plastic part and its forming method and cooking appliance |
| CN107415140A (en) * | 2017-09-07 | 2017-12-01 | 全兴工装设备（南京）有限公司 | Automobile rear-compartment plaque composite molding die and its forming method |
| CN108000826A (en) * | 2018-01-15 | 2018-05-08 | 青岛海泰科模具有限公司 | Side is buckled to low pressure injection mould |
| CN108297339A (en) * | 2018-01-19 | 2018-07-20 | 宁波方正汽车模具股份有限公司 | A kind of dossal mechanism that anti-spring is stuck |
| CN113021771A (en) * | 2021-02-25 | 2021-06-25 | 东风延锋汽车饰件系统有限公司 | Low-pressure injection molding skin cutting mold structure and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106671349A (en) * | 2017-01-03 | 2017-05-17 | 陆宇 | Thermoplastic elastomer in-die cloth patching one-time injection molding process and plastic product |
| CN107415140A (en) * | 2017-09-07 | 2017-12-01 | 全兴工装设备（南京）有限公司 | Automobile rear-compartment plaque composite molding die and its forming method |
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| CN113021771A (en) * | 2021-02-25 | 2021-06-25 | 东风延锋汽车饰件系统有限公司 | Low-pressure injection molding skin cutting mold structure and using method thereof |
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|---|---|
| CN103331873B (en) | 2015-10-28 |
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Address after: 300457 Tianjin Binhai New Area Economic and Technological Development Zone thirteenth Avenue 46 Patentee after: TIANJIN YINBAOSHAN NEW TECHNOLOGY CO., LTD. Address before: 300457 Tianjin Binhai New Area Tianjin economic and Technological Development Zone thirteenth Avenue 46 Patentee before: Tianjin Guofeng Mold Co., Ltd. |
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