CN101716810A - Induction heating and molding process - Google Patents
Induction heating and molding process Download PDFInfo
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- CN101716810A CN101716810A CN200910212551A CN200910212551A CN101716810A CN 101716810 A CN101716810 A CN 101716810A CN 200910212551 A CN200910212551 A CN 200910212551A CN 200910212551 A CN200910212551 A CN 200910212551A CN 101716810 A CN101716810 A CN 101716810A
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Abstract
The invention discloses an induction heating and molding process which comprises the following steps of: (a) heating the surface of a die to above the temperature capable of hot smelting plastics by using a heating device at a die opening phase; (b) closing the die; (c) injecting the plastics and maintaining the pressure; (d) cooling so that the temperature of the die is reduced below the thermal deformation temperature of the plastics; (e) opening the die and taking the product out. In the scheme, the surface of the die is heated when the die is opened so that the injected plastics can be more favorably molded in the die.
Description
Technical field
The present invention relates to a kind of injection molding process, particularly a kind of injection molding process of realizing with eddy-current heating.
Background technology
Injection molding process generally is to inject die cavity by the material that melts that will be heated by high pressure, makes the material that is heated after melting behind cooling curing, obtains the method for formed product.This method is applicable to the batch process of complex-shaped parts, is one of important processing method.Finishing the required time of shot moulding process claims molding cycle, also claim moulding cyclc, the injection moulding periodic process is broadly divided into following 6 stages: matched moulds, injection, pressurize, cooling, die sinking, goods take out, and above-mentioned technology is carried out repeatedly, just can continuously produce goods.
In present injection molding process,,, adopt highlighted face mould tool to carry out injection mo(u)lding mostly as the product of LCD, phone housing to some quality requirement high product.In order to guarantee the quality of shaped article, often all can carry out strict protection when using highlighted face mould tool to mould, as after die frame is to the machine can not with thing go to the surface of wiping die die cavity clean so that guarantee the mold cavity the inside; Take in the process of goods and will avoid glue spare, hand etc. are run into mould, cannot splash liquid such as water on the die face of heat.Though adopted above-mentioned these salvos, the product that adopts the injection mo(u)lding of this highlighted face mould tool to produce still has following shortcoming: 1, the surface is in conjunction with stria, and weak 2, the product internal stress trace of impact strength is a little less than the lustre lacking uniformity impact strength; 3, raw material includes the plastic cement of glass fibre, and product surface is floating fine; 4, highlighted product can float the damp uneven phenomenon of colour developing.This shows that the highlighted face mould tool of just simple employing carries out the quality requirement that injection mo(u)lding is difficult to reach product, also can produce a large amount of waste products, increase the cost of making even can reach the quality requirement of product.
Summary of the invention
At above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention provides a kind of new injection molding process, and this new injection molding process can effectively overcome the deficiency of existing injection molding process.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of induction heating and molding process, it comprises the steps:
A) die surface is heated to more than the temperature that can make plastic hot melt in the die sinking stage with heater;
B) matched moulds;
C) injection moulding, pressurize;
D) cooling is reduced to below the plastic hot deformation temperature mold temperature;
E) product is taken out in die sinking.
Preferably, employed heater is an electromagnetic induction heater in step a).
Technique scheme has following beneficial effect: in such scheme, during die sinking die surface is heated, make that the plastics after the injection moulding can be better at in-mold molding.The injection molding product that uses this technology to finish has following advantage: 1) improve in conjunction with stria, promote the intensity of joint line; 2) for the plastic that contains glass fibre, improve surface floating fiber; 3) exempt from the surface quality that application can reach high brightness, 4) reduce and penetrate pressure and locked mode pressure, be suitable for ultra-thin moulding; 5) the decorative pattern definition of raising plastic rubber member surface; 6) product that improves highlighted can float the damp uneven phenomenon of colour developing, can reach the color and luster unanimity; 7) reduce residual stress in the product, promote impact strength.
The specific embodiment
Below the preferred embodiments of the present invention are described in detail.
At first in the die sinking stage, by electromagnetic induction heater die surface is heated, the temperature of the heating plastic hot melt temperature of injection moulding as required determines that the temperature of heating should be higher than the plastic hot melt temperature.Carry out matched moulds when mold heated later on to the temperature of regulation, the plastics behind the hot melt are expelled in the mould, the mould-filling time in inject time directly is inversely proportional to mold filling speed, and mould-filling time generally is about 3-5 second in the production.Dwell time in inject time is exactly the pressure time to plastics in the die cavity, and shared large percentage in whole inject time generally is about 20-120 second (special thick product can up to 5-10 minute).Injection is carried out pressurize after finishing, and what of dwell time can be influential to the product size accuracy, and the dwell time generally depends on material temperature, the size of Mo Wen and sprue and cast gate.After pressurize a period of time, use cold water that the temperature of mould is reduced to below the plastic hot deformation temperature at short notice, last opening takes out product, can finish a mold cycle like this, repeats above-mentioned steps, can carry out production in batches to product.
In such scheme, during die sinking die surface is heated, make that the plastics after the injection moulding can be better at in-mold molding.The injection molding product that uses this technology to finish has following advantage: 1) improve in conjunction with stria, promote the intensity of joint line; 2) for the plastic that contains glass fibre, improve surface floating fiber; 3) exempt from the surface quality that application can reach high brightness, 4) reduce and penetrate pressure and locked mode pressure, be suitable for ultra-thin moulding; 5) the decorative pattern definition of raising plastic rubber member surface; 6) product that improves highlighted can float the damp uneven phenomenon of colour developing, can reach the color and luster unanimity; 7) reduce residual stress in the product, promote impact strength.
More than a kind of induction heating and molding process that the embodiment of the invention provided is described in detail; for one of ordinary skill in the art; thought according to the embodiment of the invention; part in specific embodiments and applications all can change; in sum; this description should not be construed as limitation of the present invention, and all any changes of making according to design philosophy of the present invention are all within protection scope of the present invention.
Claims (2)
1. an induction heating and molding process is characterized in that it comprises the steps:
A) die surface is heated to more than the temperature that can make plastic hot melt in the die sinking stage with heater;
B) matched moulds;
C) injection moulding, pressurize;
D) cooling is reduced to below the plastic hot deformation temperature mold temperature;
E) product is taken out in die sinking.
2. induction heating and molding process according to claim 1 is characterized in that: employed heater is an electromagnetic induction heater in step a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910212551A CN101716810A (en) | 2009-11-12 | 2009-11-12 | Induction heating and molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910212551A CN101716810A (en) | 2009-11-12 | 2009-11-12 | Induction heating and molding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101716810A true CN101716810A (en) | 2010-06-02 |
Family
ID=42431490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910212551A Pending CN101716810A (en) | 2009-11-12 | 2009-11-12 | Induction heating and molding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101716810A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102152438A (en) * | 2010-11-30 | 2011-08-17 | 常州市依斯特互感器有限公司 | Sleeve seat injection molding process |
| CN107415123A (en) * | 2017-08-31 | 2017-12-01 | 吴江市金鑫塑料厂 | A kind of plastic products cleaning treatment die casting mechanism |
| CN111002548A (en) * | 2019-12-25 | 2020-04-14 | 上海创功通讯技术有限公司 | Injection molding machine and injection molding method |
| CN111070610A (en) * | 2020-01-02 | 2020-04-28 | 华域视觉科技(上海)有限公司 | Thick-wall part forming control system and method |
| CN113878827A (en) * | 2020-07-01 | 2022-01-04 | Oppo广东移动通信有限公司 | Injection mold, injection molding machine, and injection molding method |
-
2009
- 2009-11-12 CN CN200910212551A patent/CN101716810A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102152438A (en) * | 2010-11-30 | 2011-08-17 | 常州市依斯特互感器有限公司 | Sleeve seat injection molding process |
| CN107415123A (en) * | 2017-08-31 | 2017-12-01 | 吴江市金鑫塑料厂 | A kind of plastic products cleaning treatment die casting mechanism |
| CN111002548A (en) * | 2019-12-25 | 2020-04-14 | 上海创功通讯技术有限公司 | Injection molding machine and injection molding method |
| CN111070610A (en) * | 2020-01-02 | 2020-04-28 | 华域视觉科技(上海)有限公司 | Thick-wall part forming control system and method |
| CN113878827A (en) * | 2020-07-01 | 2022-01-04 | Oppo广东移动通信有限公司 | Injection mold, injection molding machine, and injection molding method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100602 |