CN104227915A - Plastic shell manufacturing technique - Google Patents
Plastic shell manufacturing technique Download PDFInfo
- Publication number
- CN104227915A CN104227915A CN201410353154.9A CN201410353154A CN104227915A CN 104227915 A CN104227915 A CN 104227915A CN 201410353154 A CN201410353154 A CN 201410353154A CN 104227915 A CN104227915 A CN 104227915A
- Authority
- CN
- China
- Prior art keywords
- plastic
- die cavity
- temperature
- plastics
- screw rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
- B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
Abstract
The invention discloses a plastic shell manufacturing technique which is characterized in that plastic, a material barrel and a screw rod are adopted, wherein the plastic is heated in the material barrel to a flow state and the melt body of the plastic enters a die cavity under the pressure of the screw rod; as the temperature of the plastic melt body drops rapidly, the wall of the die cavity is cured and coagulated for 1-2 hours; as the screw rod begins to draw back, the pressure in the die cavity drops rapidly and humidification treatment is carried out after the inner cavity of the die is formed; the heating medium for humidification treatment is boiling water; the boiling point of the boiling water is 121 DEG C; the heating temperature is 100-121 DEG C; the heat preservation time is 2-9 hours. The plastic shell is fine in density; the die is favorable for easy exhausting and machining; the manufacturing cost of the die is low; the production benefit of injection molding is high and the manufacturing difficulty of the die is low.
Description
Technical field
The present invention relates to a kind of manufacturing process of housing, particularly a kind of manufacturing process of plastic casing, belong to the manufacturing technology field of housing.
Background technology
Engineering plastics refer to the industrial plastics being used as industrial part or sheathing material, are all excellent plastics of intensity, resistance to impact, heat resistance, hardness and ageing resistance.It is defined as by Japan's industry can as the high performance plastics constructing use and machine components, heat resistance is more than 100 DEG C, mainly be used in industrial, compare with general-purpose plastics, engineering plastics can reach higher requirement in mechanical performance, durability, corrosion resistance, heat resistance etc., and process more convenient and alternative metal material.Engineering plastics are widely used in electric, the industry such as automobile, building, office equipment, machinery, Aero-Space, to mould Dai Gang, to become international popular trend to mould Dai Muyi.Engineering plastics have become the field that in world today's plastics industry, growth rate is the fastest, and its development not only plays supporting role to national pillar industry and modern high technology industry, also promote the adjustment of Transform of Traditional Industrial Equipment and product structure simultaneously.
Due to China's automobile, the industry development such as electronics and building is rapid, current, China has become the fastest country of global project plastics demand growth, according to middle Output-input analysis of Nutrients, from now on, along with the development of domestic economy, the demand of engineering plastics will be increased further, China's engineering plastics industry development prospect is very wide, with household electric appliances, from now on only with refrigerator, refrigerator, washing machine, air-conditioning and the annual engineering plastics demand of all kinds of small household electrical appliance will reach about 600,000 tons, and for communications infrastructure construction and railway, the engineering plastics consumption of the aspects such as highway construction is then more surprising, estimate that in the following several years, aggregate demand will reach more than 4,500,000 tons, plastic formula design is the important step must carried out after process equipment and technological parameter are determined in plastic product forming processing, the height of design level is directly connected to the quality of the final utilization performance of plastic products, also be that applicating modern times technology carries out the process of modification to plastics, its technology content is high. and the generation of a successful formulation is years'experiences and the final result applying new and high technology. and plastics take high molecular polymer as main component, add a certain amount of additive and a kind of mixture formed, additive is the mixture added by some performance of a series of for a change plastics.
The importance of Making mold is mainly reflected in the demand in market, and only with automobile, the Die & Mould Market of motorcycle industry is example.Automobile, motorcycle industry is the maximum market of mould, in the country that industry is flourishing, about this market accounts for whole Die & Mould Market half.Auto industry is one of large pillar industry of Chinese national economy five, and auto industry emphasis is development parts, economy car and heavy-duty car, and automobile die, as development priority, has obtained clear and definite in Policies for Auto Industry.The basic vehicle of automobile constantly increases, and within 2005, will reach 170 kinds.The automobile of a model is die needed reaches several thousand pairs, is worth more than one hundred million unit.In order to adapt to the demand in market, automobile will constantly be remodeled, and about has the mould of 80% to need to change when automobile is remodeled.Chinese Motorcycle Development output occupies the first in the world, and according to statistics, Chinese Motorcycle Development has 14 kinds of discharge capacities more than 80 vehicle, more than 1000 model.Single motorcycle about has part 2000 kinds, and amount to more than 5000, wherein the mould that needs over half is produced.The motorcycle of a model is produced needs 1000 secondary moulds, total value more than 1,000 ten thousand yuan.Other industry, as electronics and communication, household electrical appliances, also there is huge Die & Mould Market in building etc.
Summary of the invention
Goal of the invention: in order to overcome problems of the prior art, the invention provides a kind of manufacturing process of plastic casing.
Technical scheme: for achieving the above object, the invention provides a kind of manufacturing process of plastic casing, comprise plastics, barrel, screw rod, after described plastics reach flow regime after heating in barrel, described plastics described plastic melting under the pressure of screw rod is known from experience described plastic melt in inflow die cavity and is constantly declined by temperature, die cavity wall is solidified, condensation 1 ~ 2h, described screw rod starts to retreat, pressure in described die cavity declines rapidly, because the Deformation Flow at temperature and pressure of plastic melt in forming process is very complicated, after plastifying uneven and mold filling before adding flowing, cooling velocity is different, often uneven crystallization is there is in product, orientation and contraction, cause producing corresponding crystallization in product, orientation and shrinkage stress, after the demoulding except causing secular distortion, also can make the mechanical property of product, optical property and apparent mass degenerate, can ftracture time serious, therefore some plastics need to carry out post processing, described dies cavity carries out conditioning after being shaped, described conditioning heat medium used is boiling water, the boiling point of described boiling water is 121 DEG C, heating-up temperature is 100 ~ 121 DEG C, temperature retention time 2 ~ 9 hours, density of the present invention is meticulous, mould be conducive to exhaust and easy to process, die manufacturing cost is low, the productivity effect of injection mo(u)lding is high, Making mold difficulty is low.
Pressure 0.5 ~ 0.9pa in described die cavity, keeping away like this can in order to avoid produces overlap, and packing pressure is desirable a little less than injection pressure.
Flowing in described die cavity can be divided into injection, pressurize, flows backwards and cooling four-stage, be generally 3 ~ 5 seconds inject time, the dwell time is generally 20 ~ 120 seconds, is generally 30 ~ 120 seconds cool time, the quality of the quality that can determine like this, the quality better then corresponding time is longer.
Beneficial effect: prior art of the present invention is compared tool and had the following advantages:
1, density of the present invention is meticulous, mould be conducive to exhaust and easy to process, die manufacturing cost is low, and the productivity effect of injection mo(u)lding is high, and Making mold difficulty is low;
2, by the change of controlled pressure, packing pressure is desirable a little less than injection pressure, and keeping away like this can in order to avoid produces overlap.
Detailed description of the invention
Below by way of specific embodiment, the present invention is further elaborated, be noted that for those skilled in the art, under the premise without departing from the principles of the invention, the application's claims limited range is all fallen within to the amendment of the various equivalent form of value of the present invention.
Embodiment 1:
A kind of manufacturing process of plastic casing, comprise plastics, barrel, screw rod, after described plastics reach flow regime after heating in barrel, described plastics described plastic melting under the pressure of screw rod is known from experience described plastic melt in inflow die cavity and is constantly declined by temperature, die cavity wall is solidified, condensation 1h, described screw rod starts to retreat, pressure in described die cavity declines rapidly, because the Deformation Flow at temperature and pressure of plastic melt in forming process is very complicated, after plastifying uneven and mold filling before adding flowing, cooling velocity is different, often uneven crystallization is there is in product, orientation and contraction, cause producing corresponding crystallization in product, orientation and shrinkage stress, after the demoulding except causing secular distortion, also can make the mechanical property of product, optical property and apparent mass degenerate, can ftracture time serious, therefore some plastics need to carry out post processing, described dies cavity carries out conditioning after being shaped, described conditioning heat medium used is boiling water, the boiling point of described boiling water is 121 DEG C, heating-up temperature is 100 DEG C, temperature retention time 4 hours, density of the present invention is meticulous, mould be conducive to exhaust and easy to process, die manufacturing cost is low, the productivity effect of injection mo(u)lding is high, Making mold difficulty is low, pressure 0.5pa in described die cavity, keeping away like this can in order to avoid produces overlap, and packing pressure is desirable a little less than injection pressure, flowing in described die cavity can be divided into injection, pressurize, flows backwards and cooling four-stage, be generally 3 ~ 5 seconds inject time, the dwell time is generally 30 seconds, is generally 40 seconds cool time, the quality of the quality that can determine like this, the quality better then corresponding time is longer.
In injection molding process, the temperature of mould directly has influence on quality and the production efficiency of plastic parts moulding, because the performance of various plastics requires different with moulding process, the temperature requirement of mould is also different, the plastics of poor fluidity are as PC, POM etc., requirement mold temperature is high, the too low flowing that can affect plastics of temperature, increase Osima jacoti, Osima excavata, plastic internal stress is increased, there is cold flow trace, filamentary silver, the defects such as note is discontented, the water that common mould passes into normal temperature cools, by the temperature regulating the flow of water just can regulate mould, in order to shorten molding cycle, pass into again in mould after the water of normal temperature can also being reduced temperature, shaping efficiency can be improved, for high-melting-point, the plastics of poor fluidity, the product that flow distance is long, in order to prevent lack of fill, sometimes in water pipe, warm water is also passed into mold heated, forming temperature is 170 DEG C, mold temperature is 20 ~ 70 DEG C.
Embodiment 2:
A kind of manufacturing process of plastic casing, comprise plastics, barrel, screw rod, after described plastics reach flow regime after heating in barrel, described plastics described plastic melting under the pressure of screw rod is known from experience described plastic melt in inflow die cavity and is constantly declined by temperature, die cavity wall is solidified, condensation 1.5h, described screw rod starts to retreat, pressure in described die cavity declines rapidly, because the Deformation Flow at temperature and pressure of plastic melt in forming process is very complicated, after plastifying uneven and mold filling before adding flowing, cooling velocity is different, often uneven crystallization is there is in product, orientation and contraction, cause producing corresponding crystallization in product, orientation and shrinkage stress, after the demoulding except causing secular distortion, also can make the mechanical property of product, optical property and apparent mass degenerate, can ftracture time serious, therefore some plastics need to carry out post processing, described dies cavity carries out conditioning after being shaped, described conditioning heat medium used is boiling water, the boiling point of described boiling water is 121 DEG C, heating-up temperature is 111 DEG C, temperature retention time 7 hours, density of the present invention is meticulous, mould be conducive to exhaust and easy to process, die manufacturing cost is low, the productivity effect of injection mo(u)lding is high, Making mold difficulty is low, pressure 0.7pa in described die cavity, keeping away like this can in order to avoid produces overlap, and packing pressure is desirable a little less than injection pressure, flowing in described die cavity can be divided into injection, pressurize, flows backwards and cooling four-stage, be generally 3 ~ 5 seconds inject time, the dwell time is generally 70 seconds, is generally 90 seconds cool time, the quality of the quality that can determine like this, the quality better then corresponding time is longer.
In injection molding process, the temperature of mould directly has influence on quality and the production efficiency of plastic parts moulding, because the performance of various plastics requires different with moulding process, the temperature requirement of mould is also different, the plastics of poor fluidity are as PC, POM etc., requirement mold temperature is high, the too low flowing that can affect plastics of temperature, increase Osima jacoti, Osima excavata, plastic internal stress is increased, there is cold flow trace, filamentary silver, the defects such as note is discontented, the water that common mould passes into normal temperature cools, by the temperature regulating the flow of water just can regulate mould, in order to shorten molding cycle, pass into again in mould after the water of normal temperature can also being reduced temperature, shaping efficiency can be improved, for high-melting-point, the plastics of poor fluidity, the product that flow distance is long, in order to prevent lack of fill, sometimes in water pipe, warm water is also passed into mold heated, forming temperature is 220 DEG C, mold temperature is 50 DEG C.
Embodiment 3:
A kind of manufacturing process of plastic casing, comprise plastics, barrel, screw rod, after described plastics reach flow regime after heating in barrel, described plastics described plastic melting under the pressure of screw rod is known from experience described plastic melt in inflow die cavity and is constantly declined by temperature, die cavity wall is solidified, condensation 2h, described screw rod starts to retreat, pressure in described die cavity declines rapidly, because the Deformation Flow at temperature and pressure of plastic melt in forming process is very complicated, after plastifying uneven and mold filling before adding flowing, cooling velocity is different, often uneven crystallization is there is in product, orientation and contraction, cause producing corresponding crystallization in product, orientation and shrinkage stress, after the demoulding except causing secular distortion, also can make the mechanical property of product, optical property and apparent mass degenerate, can ftracture time serious, therefore some plastics need to carry out post processing, described dies cavity carries out conditioning after being shaped, described conditioning heat medium used is boiling water, the boiling point of described boiling water is 121 DEG C, heating-up temperature is 121 DEG C, temperature retention time 9 hours, density of the present invention is meticulous, mould be conducive to exhaust and easy to process, die manufacturing cost is low, the productivity effect of injection mo(u)lding is high, Making mold difficulty is low, pressure 0.9pa in described die cavity, keeping away like this can in order to avoid produces overlap, and packing pressure is desirable a little less than injection pressure, flowing in described die cavity can be divided into injection, pressurize, flows backwards and cooling four-stage, be generally 5 seconds inject time, the dwell time is generally 120 seconds, is generally 110 seconds cool time, the quality of the quality that can determine like this, the quality better then corresponding time is longer.
In injection molding process, the temperature of mould directly has influence on quality and the production efficiency of plastic parts moulding, because the performance of various plastics requires different with moulding process, the temperature requirement of mould is also different, the plastics of poor fluidity are as PC, POM etc., requirement mold temperature is high, the too low flowing that can affect plastics of temperature, increase Osima jacoti, Osima excavata, plastic internal stress is increased, there is cold flow trace, filamentary silver, the defects such as note is discontented, the water that common mould passes into normal temperature cools, by the temperature regulating the flow of water just can regulate mould, in order to shorten molding cycle, pass into again in mould after the water of normal temperature can also being reduced temperature, shaping efficiency can be improved, for high-melting-point, the plastics of poor fluidity, the product that flow distance is long, in order to prevent lack of fill, sometimes in water pipe, warm water is also passed into mold heated, forming temperature is 280 DEG C, mold temperature is 70 DEG C.
Claims (3)
1. the manufacturing process of a plastic casing, it is characterized in that: comprise plastics, barrel, screw rod, after described plastics reach flow regime after heating in barrel, described plastics described plastic melting under the pressure of screw rod is known from experience described plastic melt in inflow die cavity and is constantly declined by temperature, die cavity wall is solidified, condensation 1 ~ 2h, described screw rod starts to retreat, pressure in described die cavity declines rapidly, described dies cavity carries out conditioning after being shaped, described. conditioning heat medium used is boiling water, the boiling point of described boiling water is 121 DEG C, heating-up temperature is 100 ~ 121 DEG C, temperature retention time 2 ~ 9 hours.
2. a kind of manufacturing process of plastic casing according to claims 1, is characterized in that: the pressure 0.5 ~ 0.9pa in described die cavity.
3. a kind of manufacturing process of plastic casing according to claims 1, is characterized in that: the flowing in described die cavity can be divided into injection, pressurize, flow backwards and cooling four-stage, be generally 3 ~ 5 seconds inject time, the dwell time is generally 20 ~ 120 seconds, is generally 30 ~ 120 seconds cool time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410353154.9A CN104227915A (en) | 2014-07-24 | 2014-07-24 | Plastic shell manufacturing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410353154.9A CN104227915A (en) | 2014-07-24 | 2014-07-24 | Plastic shell manufacturing technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104227915A true CN104227915A (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410353154.9A Pending CN104227915A (en) | 2014-07-24 | 2014-07-24 | Plastic shell manufacturing technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113146927A (en) * | 2020-11-23 | 2021-07-23 | 太仓丹妮尔模塑汽配有限公司 | Pressurizing rapid injection molding process for anti-static household appliance structural part |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173026A (en) * | 2010-12-16 | 2011-09-07 | 施汉林 | Novel heat conducting composite material and LED (light emitting diode) shell composite injection molding process |
| CN103496125A (en) * | 2013-09-14 | 2014-01-08 | 新乡学院 | Mold opening method of three-way pipe mold |
-
2014
- 2014-07-24 CN CN201410353154.9A patent/CN104227915A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173026A (en) * | 2010-12-16 | 2011-09-07 | 施汉林 | Novel heat conducting composite material and LED (light emitting diode) shell composite injection molding process |
| CN103496125A (en) * | 2013-09-14 | 2014-01-08 | 新乡学院 | Mold opening method of three-way pipe mold |
Non-Patent Citations (3)
| Title |
|---|
| 张甲敏: "《注塑技术及典型工艺实例》", 31 July 2010, article ""注塑技术及典型工艺实例"，张甲敏，第14-18页，化学工业出版社", pages: 14-18 * |
| 张维合 等: "《注射成型实用技术》", 31 October 2012, article ""注射成型实用技术"，张维合 刘志扬，第320页，化学工业出版社", pages: 320 * |
| 王加龙: "《塑料成型工艺》", 30 June 2009, article ""塑料成型工艺"，王加龙，第125-127页，印刷工业出版社", pages: 125-127 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113146927A (en) * | 2020-11-23 | 2021-07-23 | 太仓丹妮尔模塑汽配有限公司 | Pressurizing rapid injection molding process for anti-static household appliance structural part |
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Application publication date: 20141224 |