CN114770890A - Thick-wall highlight transparent injection molding forming process - Google Patents
Thick-wall highlight transparent injection molding forming process Download PDFInfo
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- CN114770890A CN114770890A CN202210612721.2A CN202210612721A CN114770890A CN 114770890 A CN114770890 A CN 114770890A CN 202210612721 A CN202210612721 A CN 202210612721A CN 114770890 A CN114770890 A CN 114770890A
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- Prior art keywords
- injection molding
- pressure maintaining
- die
- mold
- pressure
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Classifications
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- 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
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
-
- 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
-
- 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
-
- 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
- B29C2945/76531—Temperature
-
- 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
- B29C2945/76822—Phase or stage of control
- B29C2945/76856—De-compression after injection
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a molding process of a thick-wall highlight transparent injection molding part, which relates to the technical field of injection molding processes and comprises the following steps of 1, preparing a mold, an injection molding machine and a mold temperature controller to be used; step 2, starting the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 120-122 ℃, and controlling the temperature range of the die of the movable die to be 125-128 ℃; step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine; step 4, pressure maintaining: and after the injection is finished, switching to a pressure maintaining state, and maintaining the pressure in four sections, wherein the action of each section of pressure maintaining is different, so that the shrinkage of the injection molding part is reduced. Step 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 80-85 s; step 6, demolding: opening the mold, taking out an injection molding product, and completing injection molding; the invention has the advantages of improving the injection molding productivity, improving the product quality and reducing the cost.
Description
Technical Field
The invention relates to the technical field of injection molding processes, in particular to the technical field of thick-wall highlight transparent injection molding processes.
Background
The injection molding part refers to various injection molding products produced by an injection molding machine, and is generally called as injection molding parts, including various packages, parts and the like. Is mainly prepared from polyethylene or polypropylene and various organic solvents. The choice of plastic part depends mainly on the type of plastic (thermoplastic or thermosetting), the starting morphology and the shape and dimensions of the product. Injection-molded parts are generally produced by molding, transfer molding or injection molding.
The injection molding process is a process for manufacturing a semi-finished product with a certain shape from a molten raw material. The injection molding process mainly comprises 4 stages of filling, pressure maintaining, cooling, demolding and the like, and the 4 stages directly determine the molding quality of the product.
The existing method has no standard process flow for molding a thick-wall highlight transparent injection molding part, and a targeted process flow is designed; firstly, in the filling process, the shorter the filling time is, the higher the forming efficiency is, but in practice, the forming time and the injection molding speed are limited by a plurality of conditions; secondly, a mold temperature controller is needed in the filling process, a temperature control system of the mold temperature controller is also the most important ring, the temperature of the mold temperature controller, which is a very important parameter, can be accurately controlled in a specified interval, the stability of product quality and the production rate can not be met, and the cost is increased; in addition, in the existing forming process, the control standards of pressure maintaining time and pressure maintaining times are not unified, so that shrinkage of an injection molding part is easily caused, and the product quality is influenced.
Disclosure of Invention
The invention aims to: in order to solve the technical problem, the invention provides a process for molding a thick-wall high-gloss transparent injection molding.
The invention specifically adopts the following technical scheme for realizing the purpose:
a thick-wall highlight transparent injection molding forming process comprises the following steps:
step 1, preparing a mold, an injection molding machine and a mold temperature controller for use;
step 2, opening the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 120-122 ℃, and controlling the temperature range of the die of the movable die to be 125-128 ℃;
step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine;
step 4, pressure maintaining: and after the injection is finished, switching to a pressure maintaining state, and maintaining the pressure in four sections, wherein the action of each section of pressure maintaining is different, so that the shrinkage of the injection molding part is reduced.
Step 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 80-85 s;
step 6, demolding: and opening the mold, taking out the injection molding product, and completing injection molding.
Further, in step 4, the pressure maintaining parameters of the four-stage pressure maintaining are as follows:
first-stage pressure maintaining, pressure maintaining flow: v% 18, pressure (MP): p% 96, time/T: 2.5(s);
second-stage pressure maintaining, pressure maintaining flow: v% 25, pressure (MP): p% 115, time/T: 30(s);
and (3) third-stage pressure maintaining, wherein the pressure maintaining flow is as follows: v% 10, pressure (MP): p% 55, time/T: 5(s);
and (4) pressure maintaining in the fourth stage, wherein the pressure maintaining flow is as follows: v% 5, pressure (MP): p% 25, time/T: 2.5(s).
Further, in step 2, the set temperature: the temperature range of the die of the fixed die is controlled to be 120 ℃, and the temperature range of the die of the movable die is controlled to be 125 ℃.
Further, in step 2, the set temperature: the temperature range of the die of the fixed die is controlled to be 122 ℃, and the temperature range of the die of the movable die is controlled to be 128 ℃.
Further, in step 2, the set temperature: the temperature range of the die of the fixed die is controlled to be 121 ℃, and the temperature range of the die of the movable die is controlled to be 126 ℃.
The invention has the following beneficial effects:
1. the process of the invention is total, simple and reliable, the filling proportion at different times directly influences the quality of a product, and the qualified quality requirement can be finished by combining scientific injection molding and long-time work experience accumulation in the process: the injection time is a period of time from the start of the mold clamping stage to the time when mold clamping is performed after mold release; at present, the shorter the filling time is expected to be under market competition, the higher the forming efficiency is, for thick-wall injection products, the temperature of a mold temperature machine during filling is required to be accurately controlled within a specified range, so that the stability of quality can be met, the injection production rate can be improved, the cost is reduced, and the product quality is improved.
2. The pressure maintaining function is that the melt shrinks due to cooling in the injection molding process, and aims to make up for the requirements of various phenomena such as filling, compaction of plastics, prevention of recess, stable shrinkage of dimension and the like by continuously maintaining a certain forward thrust force of the screw after the injection action is finished. The invention adopts four-stage pressure maintaining, the action of each stage of pressure maintaining is different, and the set filling parameters of the injection molding part are different; the shrinkage of injection molding is reduced, and the product quality is improved.
3. The cooling is very important to the design of a cooling system of a mould in injection moulding, the design rule of the cooling system is that the designed cooling channel ensures that the cooling effect is uniform and rapid, and the design of the good cooling system can directly and greatly shorten the moulding time, improve the injection moulding productivity and reduce the cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Example 1
The embodiment provides a thick-wall high-gloss transparent injection molding process, which comprises the following steps:
step 1, preparing a mould, an injection molding machine and a mould temperature controller for use;
step 2, opening the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 120 ℃ and the temperature range of the die of the movable die to be 125 ℃;
step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine;
step 4, pressure maintaining: the injection finishes, switches to the pressurize state, adopts four sections pressurize, and every section pressurize effect is inequality, reduces the shrink of injection molding, and the pressurize parameter of four sections pressurize is as follows:
first-stage pressure maintaining, pressure maintaining flow: v% 18, pressure (MP): p% 96, time/T: 2.5(s);
second-stage pressure maintaining, pressure maintaining flow: v% 25, pressure (MP): p% 115, time/T: 30(s);
and third-stage pressure maintaining, pressure maintaining flow: v% 10, pressure (MP): p% 55, time/T: 5(s);
pressure maintaining in the fourth stage, pressure maintaining flow: v% 5, pressure (MP): p% 25, time/T: 2.5(s)
Step 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 80 s;
step 6, demolding: and opening the mold, taking out the injection molding product, and completing injection molding.
Example 2
The embodiment provides a thick-wall high-gloss transparent injection molding forming process, which comprises the following steps:
step 1, preparing a mould, an injection molding machine and a mould temperature controller for use;
step 2, starting the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 122 ℃ and controlling the temperature range of the die of the movable die to be 128 ℃;
step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine;
step 4, pressure maintaining: the injection finishes, switches to the pressurize state, adopts four sections pressurize, and every section pressurize's effect is inequality, reduces the shrink of injection molding, and the pressurize parameter of four sections pressurize is as follows:
first-stage pressure maintaining, pressure maintaining flow: v% 18, pressure (MP): p% 96, time/T: 2.5(s);
second-stage pressure maintaining, pressure maintaining flow: v% 25, pressure (MP): p% 115, time/T: 30(s);
and (3) third-stage pressure maintaining, wherein the pressure maintaining flow is as follows: v% 10, pressure (MP): p% 55, time/T: 5(s);
pressure maintaining in the fourth stage, pressure maintaining flow: v% 5, pressure (MP): p% 25, time/T: 2.5(s)
And 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 85 s;
step 6, demolding: and opening the mold, taking out the injection molding product, and finishing injection molding.
Example 3
The embodiment provides a thick-wall high-gloss transparent injection molding process, which comprises the following steps:
step 1, preparing a mould, an injection molding machine and a mould temperature controller for use;
step 2, starting the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 121 ℃ and the temperature range of the die of the movable die to be 126 ℃;
step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine;
step 4, pressure maintaining: the injection finishes, switches to the pressurize state, adopts four sections pressurize, and every section pressurize's effect is inequality, reduces the shrink of injection molding, and the pressurize parameter of four sections pressurize is as follows:
first-stage pressure maintaining, pressure maintaining flow: v% 18, pressure (MP): p% 96, time/T: 2.5(s);
second-stage pressure maintaining, pressure maintaining flow: v% 25, pressure (MP): p% 115, time/T: 30(s);
and (3) third-stage pressure maintaining, wherein the pressure maintaining flow is as follows: v% 10, pressure (MP): p% 55, time/T: 5(s);
and (4) pressure maintaining in the fourth stage, wherein the pressure maintaining flow is as follows: v% 5, pressure (MP): p% 25, time/T: 2.5(s)
And 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 83 s;
step 6, demolding: and opening the mold, taking out the injection molding product, and completing injection molding.
In this embodiment, demolding is the last step in an injection molding cycle. Although the product is formed by cold setting, demoulding still has very important influence to the quality of product, and the improper mode of demoulding can lead to the product atress uneven when demoulding, arouse defects such as product deformation when ejecting. The demolding mode mainly comprises two modes: ejector pin drawing of patterns and stripper plate drawing of patterns. When the mold is designed, a proper demolding mode is selected according to the structural characteristics of the product so as to ensure the product quality.
Claims (5)
1. The molding process of the thick-wall high-gloss transparent injection molding part is characterized by comprising the following steps of:
step 1, preparing a mould, an injection molding machine and a mould temperature controller for use;
step 2, opening the injection molding machine, the mold and the mold temperature controller, setting the temperature control of the mold temperature controller, and setting the temperature: controlling the temperature range of the die of the fixed die to be 120-122 ℃, and controlling the temperature range of the die of the movable die to be 125-128 ℃;
step 3, filling: filling raw materials into the preheated mold through injection by the injection molding machine;
step 4, pressure maintaining: and after the injection is finished, switching to a pressure maintaining state, and maintaining the pressure in four sections, wherein the action of each section of pressure maintaining is different, so that the shrinkage of the injection molding part is reduced.
Step 5, cooling: after the pressure maintaining is finished, entering a cooling stage, wherein the cooling time is 80-85 s;
step 6, demolding: and opening the mold, taking out the injection molding product, and completing injection molding.
2. The process of claim 1, wherein in step 4, the four-stage pressure maintaining parameters are as follows:
first-stage pressure maintaining, pressure maintaining flow: v% 18, pressure (MP): p% 96, time/T: 2.5(s);
second-stage pressure maintaining, pressure maintaining flow: v% 25, pressure (MP): p% 115, time/T: 30(s);
and third-stage pressure maintaining, pressure maintaining flow: v% 10, pressure (MP): p% 55, time/T: 5(s);
and (4) pressure maintaining in the fourth stage, wherein the pressure maintaining flow is as follows: v% 5, pressure (MP): p% 25, time/T: 2.5(s).
3. A process for molding a thick-walled high-gloss transparent injection-molded part according to claim 1, wherein in step 2, the set temperature is: the temperature range of the die of the fixed die is controlled to be 120 ℃, and the temperature range of the die of the movable die is controlled to be 125 ℃.
4. The process for molding the thick-wall high-gloss transparent injection molding part according to claim 1, wherein in the step 2, the set temperature is as follows: the temperature range of the die of the fixed die is controlled to be 122 ℃, and the temperature range of the die of the movable die is controlled to be 128 ℃.
5. A process for molding a thick-walled high-gloss transparent injection-molded part according to claim 1, wherein in step 2, the set temperature is: the temperature range of the die of the fixed die is controlled to be 121 ℃, and the temperature range of the die of the movable die is controlled to be 126 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210612721.2A CN114770890A (en) | 2022-05-31 | 2022-05-31 | Thick-wall highlight transparent injection molding forming process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210612721.2A CN114770890A (en) | 2022-05-31 | 2022-05-31 | Thick-wall highlight transparent injection molding forming process |
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| Publication Number | Publication Date |
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| CN114770890A true CN114770890A (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210612721.2A Pending CN114770890A (en) | 2022-05-31 | 2022-05-31 | Thick-wall highlight transparent injection molding forming process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117301413A (en) * | 2023-11-28 | 2023-12-29 | 成都瀚德胜邦光学有限公司 | High-light transparent part thermal cycle injection molding device and molding method thereof |
| CN119458826A (en) * | 2024-11-23 | 2025-02-18 | 宁波创基机械股份有限公司 | Injection molding control method, system, storage medium and injection molding machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101439575A (en) * | 2008-12-26 | 2009-05-27 | 北京东明兴业科技有限公司 | Injection molding process of thin-wall plastic product |
| CN112277235A (en) * | 2020-09-18 | 2021-01-29 | 中国航发北京航空材料研究院 | A kind of injection molding method of super-sized polymer glass |
| CN112622218A (en) * | 2020-12-04 | 2021-04-09 | 无锡鑫巨宏智能科技有限公司 | Injection molding process of precise optical lens |
-
2022
- 2022-05-31 CN CN202210612721.2A patent/CN114770890A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101439575A (en) * | 2008-12-26 | 2009-05-27 | 北京东明兴业科技有限公司 | Injection molding process of thin-wall plastic product |
| CN112277235A (en) * | 2020-09-18 | 2021-01-29 | 中国航发北京航空材料研究院 | A kind of injection molding method of super-sized polymer glass |
| CN112622218A (en) * | 2020-12-04 | 2021-04-09 | 无锡鑫巨宏智能科技有限公司 | Injection molding process of precise optical lens |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117301413A (en) * | 2023-11-28 | 2023-12-29 | 成都瀚德胜邦光学有限公司 | High-light transparent part thermal cycle injection molding device and molding method thereof |
| CN117301413B (en) * | 2023-11-28 | 2024-02-20 | 成都瀚德胜邦光学有限公司 | High-light transparent part thermal cycle injection molding device and molding method thereof |
| CN119458826A (en) * | 2024-11-23 | 2025-02-18 | 宁波创基机械股份有限公司 | Injection molding control method, system, storage medium and injection molding machine |
| CN119458826B (en) * | 2024-11-23 | 2025-11-21 | 宁波创基机械股份有限公司 | Injection control method and system of injection molding machine, storage medium and injection molding machine |
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Application publication date: 20220722 |