CN110871555A - Injection molding method of thin-wall product - Google Patents
Injection molding method of thin-wall product Download PDFInfo
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- CN110871555A CN110871555A CN201911180508.3A CN201911180508A CN110871555A CN 110871555 A CN110871555 A CN 110871555A CN 201911180508 A CN201911180508 A CN 201911180508A CN 110871555 A CN110871555 A CN 110871555A
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- injection molding
- thin
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- pressure
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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
- B29C45/76—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
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding method of a thin-wall product, which comprises the following steps: in the injection molding process, leading in preset injection molding parameters, and controlling the pressure change rate at the valve gate position of the mold to be smaller than a preset rate; and detecting that the pressure change rate at the valve gate position of the mold is smaller than a preset rate, and performing feedback regulation when the pressure change rate is larger than the preset rate. According to the injection molding method of the thin-wall product, the rate of pressure change at the position of the valve gate of the mold is controlled to be smaller than the preset rate, so that the yield of the product can be improved.
Description
Technical Field
The invention relates to the field of plastic forming and injection molding, in particular to an injection molding method of a thin-wall product.
Background
The light weight of automobiles has become a new trend in the development of automobiles due to the need for energy saving. The light weight means that the total weight of the automobile is reduced as much as possible on the premise of ensuring the safety performance of the automobile, so that the energy consumption and the emission of the automobile are reduced on the premise of ensuring the power of the automobile.
For a large number of plastic parts in automobiles, the wall thickness of the parts can be reduced for the purpose of achieving light weight. For thin-wall parts, if a conventional injection molding scheme is adopted, a weld line and other problems can be caused by overlarge injection molding pressure, so that the injection molding yield of a product is low.
Disclosure of Invention
In view of the above, the present invention is directed to a method for injection molding of thin-walled products, which can improve the yield of the products.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of injection molding a thin-walled product, the method comprising the steps of:
in the injection molding process, leading in preset injection molding parameters, and controlling the pressure change rate at the valve gate position of the mold to be smaller than a preset rate;
and detecting that the pressure change rate at the valve gate position of the mold is smaller than a preset rate, and performing feedback regulation when the pressure change rate is larger than the preset rate.
Preferably, the method further comprises:
establishing an injection molding model for a thin-wall product;
and testing the injection molding model, and acquiring injection molding parameters of the injection molding model under the condition that the pressure change rate of the valve gate position is smaller than a preset rate.
Preferably, the method further comprises:
the preset speed is 15-25 MPa/s.
Preferably, the method further comprises:
the parameters of the injection molding method of the thin-walled product include the opening rate of the valve gate.
Preferably, the method further comprises:
the opening rate of the valve gate is achieved by controlling the speed of movement of the valve pin.
Preferably, the obtaining of the injection molding parameters of the injection mold under the condition that the pressure change rate of the injection mold at the valve gate position is smaller than a preset rate includes:
and acquiring displacement data of the valve needle corresponding to a plurality of time points in the simulated injection molding process, and fitting to obtain a relation curve of the displacement of the valve needle and time.
Preferably, the method further comprises:
the displacement versus time curve of the valve needle is: and S is 63.724t-50.326t +13.873t +0.5854, wherein S is the displacement of the valve pin, and t is the opening time of the valve gate.
Preferably, the method further comprises:
the parameters of the injection molding method of the thin-wall product further comprise at least one of mold temperature, injection molding material temperature, pressure holding pressure and pressure holding time.
Preferably, the method further comprises:
the mold temperature is 75-85 ℃, the injection molding material temperature is 230-240 ℃, the pressure maintaining time is 4-6s, and the pressure maintaining pressure is 60-80 MPa.
Preferably, the method further comprises:
the mold is provided with a plurality of valve gates, and the opening rate of each valve gate is controlled independently.
Through the technical scheme, the injection molding method of the thin-wall product comprises the following steps: in the injection molding process, leading in preset injection molding parameters, and controlling the pressure change rate at the valve gate position of the mold to be smaller than a preset rate; and detecting that the pressure change rate at the valve gate position of the mold is smaller than a preset rate, and performing feedback regulation when the pressure change rate is larger than the preset rate. According to the injection molding method of the thin-wall product, the rate of pressure change at the position of the valve gate of the mold is controlled to be smaller than the preset rate, so that the yield of the product can be improved.
Drawings
FIG. 1 is a first schematic flow chart of the injection molding method of the thin-walled product of the present invention;
FIG. 2 is a second schematic flow chart of the injection molding method of the thin-walled product of the present invention.
Detailed Description
The invention provides an injection molding method of a thin-wall product, which comprises the following steps as shown in figure 1:
step 101: in the injection molding process, leading in preset injection molding parameters, and controlling the pressure change rate at the valve gate position of the mold to be smaller than a preset rate;
step 102: and detecting that the pressure change rate at the valve gate position of the mold is smaller than a preset rate, and performing feedback regulation when the pressure change rate is larger than the preset rate.
According to the injection molding method of the thin-wall product, the rate of pressure change at the position of the valve gate of the mold is controlled to be smaller than the preset rate, so that the yield of the product can be improved.
In the present invention, the method further comprises:
establishing an injection molding model for a thin-wall product;
and testing the injection molding model, and acquiring injection molding parameters of the injection molding model under the condition that the pressure change rate of the valve gate position is smaller than a preset rate. Through the injection molding model, the influence of injection molding parameters on the injection molding quality can be tested more comprehensively, and the method is a better embodiment.
In the present invention, the method further comprises:
the preset speed is 15-25 MPa/s. Thus, the range of variation is stable and is a more preferred embodiment.
In the present invention, the method further comprises:
the parameters of the injection molding method of the thin-walled product include the opening rate of the valve gate.
In the present invention, the method further comprises:
the opening rate of the valve gate is achieved by controlling the speed of movement of the valve pin.
In the invention, the obtaining of the injection molding parameters of the injection molding model under the condition that the pressure change rate of the valve gate position is smaller than the preset rate comprises:
and acquiring displacement data of the valve needle corresponding to a plurality of time points in the simulated injection molding process, and fitting to obtain a relation curve of the displacement of the valve needle and time.
In the present invention, the method further comprises:
the displacement versus time curve of the valve needle is: and S is 63.724t-50.326t +13.873t +0.5854, wherein S is the displacement of the valve pin, and t is the opening time of the valve gate.
In the present invention, the method further comprises:
the parameters of the injection molding method of the thin-wall product further comprise at least one of mold temperature, injection molding material temperature, pressure holding pressure and pressure holding time.
In the present invention, the method further comprises:
the mold temperature is 75-85 ℃, the injection molding material temperature is 230-240 ℃, the pressure maintaining time is 4-6s, and the pressure maintaining pressure is 60-80 MPa.
In the present invention, the method further comprises:
the mold is provided with a plurality of valve gates, and the opening rate of each valve gate is controlled independently.
So that the manner in which the features and aspects of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
As shown in fig. 2, the present embodiment provides an injection molding method for thin-walled products, which can be used for injection molding of thin-walled products. In order to avoid the problems that the injection pressure is too large or a welding line is easy to generate in the injection molding process of thin-wall products, the thin-wall products can adopt the following steps: the multi-valve gate delayed injection molding process can reduce the requirement on injection molding pressure and avoid the generation of a weld line. For convenience of introduction, in the invention, the thin-wall product is described by taking a thin-wall lens in an automobile as an example.
The thin-wall lens is characterized in that: the length can reach more than 1000mm, and the thickness is only 2-3 mm. However, due to the characteristics of thin thickness and large length of the thin-wall lens, the injection molding runner is very long, and in order to flow to the farthest position, large injection molding pressure is needed, but the pressure is too large, so that many other problems occur. Therefore, in injection molding, more than five valve gates are required to overcome the problem of too long flow channels. However, the large number of valve gates causes: when the valve gate is opened, a large pressure is instantaneously generated at the gate position. Thereby causing a significant stagnation at the valve gate position and eventually causing the surface of the molded product to become wavy and the appearance quality of the product to be poor. In addition, the pressure fluctuation at the valve gate position is large, the pressure forms a gradient, and the uneven distribution of the contour line of the product flow is also caused. Therefore, the problems of uneven shrinkage of the product, warping deformation of the product, local stress concentration and the like are caused, and the subsequent cracking of the product is easy to occur.
In order to solve the problems, the injection molding method of the thin-wall product provided by the invention is characterized in that a thin-wall injection molding model is established before the thin-wall product is injected. The thin-wall injection molding model is used for simulating the injection molding condition of thin-wall products. And adjusting and optimizing parameters of the injection molding method of the thin-wall product by ensuring that the pressure change rate at the position of a valve gate of the mold is smaller than a preset rate, and storing the parameters according to the optimized parameters of the injection molding method of the thin-wall product for controlling the actual injection molding process. Therefore, the pressure fluctuation at the valve gate position is small in the actual injection molding process. The stable change of the pressure can avoid generating stagnation flow, thereby avoiding the surface of the product from generating ripples after molding and improving the appearance quality of the product. In addition, the pressure at the position of the gate of the control valve is stably changed, so that the flow contour lines in the product are uniformly distributed, the product is uniformly contracted, and the surface warping or stress concentration of the product is avoided.
As shown in fig. 2, the process of simulation analysis of the thin-wall lens by means of the injection molding simulation tool molflow software in the present invention is as follows:
step 201: and establishing an injection molding model. And establishing an injection molding model for the thin-wall product.
Step 202: and importing the injection model into MOLDFLOW software.
Step 203: the grid is divided and a casting and cooling system is established. And setting parameters of an injection molding method of the thin-wall product.
Step 204: the opening rate of the valve gate is optimized.
Step 205: a rate of change of pressure at the valve gate position is detected. Whether the rate of change of pressure is less than a preset rate. If the pressure is lower than the preset rate, the pressure change at the position of the valve gate is stable, the fluctuation is small, the generation of stagnant flow can be avoided, and the injection molding method parameters of thin-wall products are reasonable and available. If the pressure change rate at the valve gate position is greater than the preset rate, the pressure fluctuation at the valve gate position is large, stagnation is easily generated, and the injection molding method parameters of the thin-wall product need to be further optimized until whether the pressure change rate at the valve gate position is less than the preset rate. The specific value of the preset rate can be set according to the specific formed product, the thin-wall lens is taken as an example, and the preset rate can be 15-25MPa/s, such as 15MPa/s, 18MPa/s, 20MPa/s, 23MPa/s and 25 MPa/s. In the embodiment, the preset speed is selected to be 20MPa/s, namely, the pressure change at the position of the inner valve gate at the adjacent moment is smaller than 20MPa by optimizing the parameters of the injection molding method of the thin-wall product.
Step 206: and obtaining the optimized valve gate opening rate.
In the invention, the optimized injection molding method parameters of the thin-wall products also comprise the opening rate of the valve gate. The valve gate comprises a gate arranged on the mould and a valve pin matched with the gate, and the valve pin can block the gate. When injection molding, the valve pin moves to the outside of the mold so that the valve pin gradually separates from the gate to open the gate. The control of the opening rate of the valve gate can be achieved by controlling the moving speed of the valve pin.
Further, in the software simulation process, the displacement of the valve needle corresponding to a plurality of time points can be obtained. Through a plurality of groups of data, a valve needle movement curve, namely a relationship curve of the displacement of the valve needle and the time can be obtained through fitting. The obtained relation curve is applied to the injection molding method of the actual thin-wall product, so that the injection molding process of the product can be optimized, the problems of stagnation, warping deformation, cracking and the like are avoided, and the injection molding quality of the product is improved.
In the invention, the optimized process parameters further comprise at least one of mold temperature, injection molding material temperature, holding pressure and holding time. The optimization method of the process parameters is the same as the opening rate of the valve gate, a group of process parameters is selected firstly in the simulation injection molding process, one or more of the process parameters are adjusted by detecting the pressure change at the position of the valve gate in the molding process, and the pressure change condition at the position of the valve gate is controlled by matching a plurality of process parameters.
Wherein the mold temperature can be 75-85 deg.C, such as 75 deg.C, 78 deg.C, 80 deg.C, 82 deg.C, 85 deg.C; the temperature of the injection molding material can be 230-240 ℃, such as 230 ℃, 232 ℃, 234 ℃, 236 ℃, 238 ℃ and 240 ℃; dwell times of 4-6s, e.g., 4s, 5s, 6 s; the holding pressure may be 60 to 80MPa, for example 60MPa, 65MPa, 70MPa, 75MPa, 80 MPa.
Because a plurality of valve gates are arranged on the mold, the positions of the valve gates are different, and the opening speeds of the valve gates can also be different. In order to control the opening rate of the valve gate appropriately according to the position of the valve gate, the opening rate of each valve gate may be controlled individually.
In the invention, a thin-wall injection molding model is established by taking a thin-wall lens with the length of 1400mm and the thickness of 2.5mm as an example, and is introduced into MOLDFLOW software for simulation analysis. When the conventional injection molding method of thin-wall products is adopted for molding, the pressure gradient at the position of a gate of a mold valve is large, and the pressure fluctuation at adjacent moments is large. The flow contour lines in the product are not uniformly distributed, and the phenomenon of stagnation exists during the mold testing.
When the injection molding method of the thin-wall product provided by the invention is used for molding, a plurality of groups of data of time increment and displacement increment in the opening process of the valve gate are obtained through simulation, a relation curve between the opening time and the displacement of the valve rod can be obtained through fitting the data, and the curve formed through fitting the plurality of groups of data is a common technical means and is not detailed in the invention.
According to the injection molding method of the thin-wall product, the pressure fluctuation at the position of the valve gate in adjacent moments is small, the flow contour lines in the product are uniformly distributed, and the stagnation phenomenon does not exist at the position of the valve gate.
The injection molding method for the thin-wall product provided by the invention is adopted to produce the thin-wall lens, and the stagnation phenomenon at the valve gate position can be eliminated, so that the pressure distribution at the valve gate position is uniform, the product shrinkage is uniform, the warping deformation is reduced, the appearance quality of the product is improved, and the cracking risk is eliminated. The optimized injection molding method parameters of the thin-wall products can be completed by utilizing MOLDFLOW software, the operation is simple, and the optimized injection molding method of the thin-wall products can further reduce the thickness of the products and the weight of the vehicle body.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of injection molding a thin-walled product, the method comprising the steps of:
in the injection molding process, leading in preset injection molding parameters, and controlling the pressure change rate at the valve gate position of the mold to be smaller than a preset rate;
and detecting that the pressure change rate at the valve gate position of the mold is smaller than a preset rate, and performing feedback regulation when the pressure change rate is larger than the preset rate.
2. A method of injection molding a thin-walled product according to claim 1, further comprising:
establishing an injection molding model for a thin-wall product;
and testing the injection molding model, and acquiring injection molding parameters of the injection molding model under the condition that the pressure change rate of the valve gate position is smaller than a preset rate.
3. A method of injection molding a thin-walled product according to claim 2, further comprising:
the preset speed is 15-25 MPa/s.
4. A method of injection molding a thin-walled product according to claim 3, further comprising:
the parameters of the injection molding method of the thin-walled product include the opening rate of the valve gate.
5. A method of injection molding a thin-walled product according to claim 4, wherein the method further comprises:
the opening rate of the valve gate is achieved by controlling the speed of movement of the valve pin.
6. The method of injection molding a thin-walled product according to claim 5, wherein said obtaining injection molding parameters for which a rate of change of pressure at a valve gate position of the injection mold is less than a preset rate comprises:
and acquiring displacement data of the valve needle corresponding to a plurality of time points in the simulated injection molding process, and fitting to obtain a relation curve of the displacement of the valve needle and time.
7. A method of injection molding a thin-walled product according to claim 6, further comprising:
the displacement versus time curve of the valve needle is: and S is 63.724t-50.326t +13.873t +0.5854, wherein S is the displacement of the valve pin, and t is the opening time of the valve gate.
8. A method of injection molding a thin-walled product according to claim 4, wherein the method further comprises:
the parameters of the injection molding method of the thin-wall product further comprise at least one of mold temperature, injection molding material temperature, pressure holding pressure and pressure holding time.
9. A method of injection molding a thin-walled product as claimed in claim 8, wherein the method further comprises:
the mold temperature is 75-85 ℃, the injection molding material temperature is 230-240 ℃, the pressure maintaining time is 4-6s, and the pressure maintaining pressure is 60-80 MPa.
10. A method of injection moulding a thin-walled product according to any of claims 4 to 9, characterized in that the method further comprises:
the mold is provided with a plurality of valve gates, and the opening rate of each valve gate is controlled independently.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911180508.3A CN110871555A (en) | 2019-11-27 | 2019-11-27 | Injection molding method of thin-wall product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911180508.3A CN110871555A (en) | 2019-11-27 | 2019-11-27 | Injection molding method of thin-wall product |
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| CN110871555A true CN110871555A (en) | 2020-03-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180141252A1 (en) * | 2016-11-18 | 2018-05-24 | iMFLUX Inc. | Method for Controlling Valve Gates Using One or More Strain Gauges |
| CN108527781A (en) * | 2013-06-24 | 2018-09-14 | 圣万提注塑工业（苏州）有限公司 | Injection molding flow control apparatus and method |
| CN108943637A (en) * | 2018-08-09 | 2018-12-07 | 华域视觉科技(上海)有限公司 | A kind of Shooting Technique |
| CN109878045A (en) * | 2019-01-31 | 2019-06-14 | 贵州省材料产业技术研究院 | Intelligence adjusts the control device that mold cavity pressure is constant and is precisely controlled |
| CN110366484A (en) * | 2017-03-20 | 2019-10-22 | 圣万提注塑工业（苏州）有限公司 | Valve pin position and speed control method and device |
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2019
- 2019-11-27 CN CN201911180508.3A patent/CN110871555A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108527781A (en) * | 2013-06-24 | 2018-09-14 | 圣万提注塑工业（苏州）有限公司 | Injection molding flow control apparatus and method |
| US20180141252A1 (en) * | 2016-11-18 | 2018-05-24 | iMFLUX Inc. | Method for Controlling Valve Gates Using One or More Strain Gauges |
| CN110366484A (en) * | 2017-03-20 | 2019-10-22 | 圣万提注塑工业（苏州）有限公司 | Valve pin position and speed control method and device |
| CN108943637A (en) * | 2018-08-09 | 2018-12-07 | 华域视觉科技(上海)有限公司 | A kind of Shooting Technique |
| CN109878045A (en) * | 2019-01-31 | 2019-06-14 | 贵州省材料产业技术研究院 | Intelligence adjusts the control device that mold cavity pressure is constant and is precisely controlled |
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