CN110587909A - In-mold injection molding method for curved surface window - Google Patents
In-mold injection molding method for curved surface window Download PDFInfo
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- CN110587909A CN110587909A CN201910860690.0A CN201910860690A CN110587909A CN 110587909 A CN110587909 A CN 110587909A CN 201910860690 A CN201910860690 A CN 201910860690A CN 110587909 A CN110587909 A CN 110587909A
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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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
- B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
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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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
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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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
- B29C2037/0046—In-mould printing, in-mould transfer printing
Abstract
The application relates to an in-mold injection molding method of a curved surface window in the technical field of display window product processing, which comprises the following steps of firstly, performing mold flow analysis research and structure optimization by using Moldflow software; step two, designing a curved surface window IMR mould, step three, optimizing a curved surface window product test mould and a production process, testing the mould, and analyzing the processes of installing the mould and equipment, adjusting the machine and sampling. The curved surface window IMR process is reliable, the mold design is optimized reasonably, the IMR forming of the curved surface window product is successfully realized, the production efficiency is high, and beneficial experience can be provided for IMR process and mold design of large plastic products in the future.
Description
Technical Field
The invention relates to the technical field of display window product processing, in particular to an in-mold injection molding method of a curved surface window.
Background
The IMD technology is a general term for in-mold Insert Molding (IML), in-mold Insert Molding (IMF), and in-mold transfer printing (IMR). The IML technology is suitable for 2D plastic parts without stretching and with small curved surfaces; the IMF technology is suitable for 3D plastic parts with high stretching and large curved surfaces; the IMR technique is to peel off the plastic sheet from the decorative film, leaving only the ink on the surface of the plastic part. Because the IML technology is similar to the IMF technology, part of professionals divide the IMD into IML (intrinsic memory modeling) (IMF) and IMR (intrinsic memory modeling), the biggest difference between the IML technology and the IMF technology is that the plastic sheet is arranged on the surface of a plastic part to serve as a protective film, and the plastic sheet is only provided with an ink layer on the surface of the plastic part.
In the next half year of 2006, with the advent of HP notewood Notebook (whose upper cover adopts IMR molding technology), it was marked that the in-mold transfer technology has been successfully applied to large-size products. The principle of IMR (in-mold transfer) is to use a precise, high-speed, stable film feeder (positioning of high-speed transfer position) to feed an IMR film into a molding die when a plastic product is injection molded, and to perform injection molding of plastic grease after the die is closed. A technique of performing injection molding and thermal transfer printing in a mold by performing thermal transfer printing in a mold cavity by using the heat and pressure of a plastic resin itself at the time of injection molding to take out a molded product and finish three-dimensional decoration of an injection molded product is called mold transfer printing. In the IMR process, there are many factors and problems affecting the injection molding, whether the product structural design is reasonable or not, whether the design of the mold is good or bad, and whether the injection molding process parameters are reasonable or not all affect the injection molding of the IMR.
The above problems also restrict the development of the IMR technology for display window products, especially curved window products.
Disclosure of Invention
The invention provides an in-mold injection molding method of a curved surface window, which aims to solve the defects of poor mold design and unreasonable injection molding process parameter setting of the prior art in the production of curved surface window products by using IMR.
The invention provides an in-mold injection molding method of a curved surface window, which comprises the following steps of firstly, performing mold flow analysis research and structure optimization by using Moldflow software; the method comprises the following steps of a, modeling: establishing a three-dimensional model of a curved surface window by UG software, importing the established three-dimensional model of the curved surface window product into Moldflow software, and optimizing a mold structure; b. parameter analysis and determination: analyzing and researching the melt fluidity, pressure drop and formability of the material of the product under the conditions of different mold temperatures and different glue feeding positions by using Moldflow software, and determining the optimal glue feeding point of the curved surface window product; under the conditions, the filling time, the injection pressure, the mold locking force, the deformation of the product and the like of the product are subjected to simulation analysis;
step two, designing a curved surface window IMR mold: according to parameter data analyzed by Moldflow software, and in combination with a special mould structure of an IMR (in-mold labeling) process, UG (Unigraphics) software is used for designing and optimizing the arrangement position, the pouring system, the air suction channel, the film pressing mechanism and the cooling system of the mould;
step three, the optimization of the mould testing and production process of the curved surface window product: and (3) testing the mold, namely performing process adjustment by analyzing the installation, machine adjustment and sample process of the mold and equipment and taking parameter data analyzed by Moldflow software as an actual process basis, performing analysis test on the performance and appearance of a sample product, and finally determining the injection molding method.
Further, in the first step, the Moldflow theory process parameters are as follows: temperature of the die: 80 ℃, melt temperature: 220 ℃, injection pressure: 53.46Mpa, clamping force: 82.55T, fill time: 3.580sec, cooling time: 20sec, maximum shear rate: 12449/s.
Further, in the third step, the actual production process parameters are as follows: temperature of the die: 80 ℃, melt temperature: 210 ℃, injection pressure: 55Mpa, clamping force: 95T, filling time: 4sec, cooling time: 18sec, dwell pressure: 35 MPa. .
Furthermore, the pouring system is a flip-chip mold, and a mode that a lengthened hot nozzle directly penetrates into a male mold core from a panel and then a cold runner is adopted during pouring is adopted.
Further, when the pressure maintaining pressure in the third step is 35MPa, the pressure maintaining speed is 15cm3And/s, dwell time 2 seconds.
The invention has the working principle and beneficial effects.
1) Simulating different glue feeding points and glue feeding sizes by Moldflow software, and finally, analyzing and comparing a plurality of simulation results to finally determine reasonable glue feeding points and glue feeding sizes, so that the ink flushing phenomenon possibly caused by plastic melt to the film patterns is avoided; in addition, on the basis of solving the adhesion force problem of the product ink, a reasonable mold temperature, material temperature and injection pressure parameter is finally obtained through the simulation comparison of mold temperature, material temperature and injection pressure by Moldflow software and the adjustment of the parameters in the production process, so that the adhesion force requirement of the product can be met, and the molding cycle of the product is not influenced.
2) The Moldflow die flow theory process parameters are as follows: the mold temperature is 80 ℃, the melt temperature is 220 ℃, the injection pressure is 53.46Mpa, the mold locking force is 82.55T, the filling time is 3.580sec, the cooling time is 20sec, and the maximum shear rate is 12449/s; the final actual production process parameters are as follows: the mold temperature is 80 ℃, the melt temperature is 210 ℃, the injection pressure is 55Mpa, the mold locking force is 95T, the filling time is 4sec, the cooling time is 18sec, and the pressure maintaining pressure is 35 Mpa. From the comparison of the data, it can be seen that the theoretical and actual process parameters are substantially identical. The key parameters of the die set by the curved surface window product are shown as follows: the diameter (small end) of the main sprue is 3.2mm, and the taper is 3 degrees; diameter phi of the bypass is 8 mm; the length of the gate is 15mm, and the width is 1.2 mm.
3) The adhesive force of the printed pattern is improved along with the increase of the mold temperature, the material temperature and the injection pressure; when the pressure maintaining pressure is 35MPa and the pressure maintaining speed is 15cm3The total deformation and all-directional deformation of the product are well controlled when the pressure maintaining time is 2 seconds; the marking blocks are processed and installed at the upper end and the lower end of the movable template of the die, so that the positioning precision of the die and the diaphragm can be obviously improved. The transfer film solves the technical problems of high-speed precision positioning of the transfer film in a die, insufficient transfer adhesive force of a printed pattern, product deformation and the like.
4) The curved surface window IMR forming process and the mould adopt an outsourcing film feeding machine and a customized diaphragm to be installed and used on an original injection molding machine besides the conventional mould flow analysis and structural design, and expand some special structures of the functions of the injection molding machine, so that the IMR process is realized. And an injection molding manipulator is matched, and reasonable process adjustment is carried out, so that the product is produced fully automatically, and qualified products are prepared.
5) The curved surface window IMR process is reliable, the mold design is optimized reasonably, the IMR forming of the curved surface window product is successfully realized, the production efficiency is high, and beneficial experience can be provided for IMR process and mold design of large plastic products in the future.
Drawings
FIG. 1 is a technical route of a curved window product;
FIG. 2 is a view of a gate analysis;
FIG. 3 is a diagram of a glue feeding scheme;
FIG. 4 is a die set diagram;
FIG. 5 is a cooling diagram of a movable mold with an annular water channel;
FIG. 6 is a cooling diagram of a tower waterway fixed die;
FIG. 7 is a top hole bitmap;
FIG. 8 is an appearance diagram of a non-defective product;
fig. 9 is a schematic view of the positioning scheme of the mold and the membrane.
Detailed Description
The following is further detailed by way of specific embodiments:
fig. 1 is a product technology route chart of the present invention, and the specific steps are as follows:
firstly, performing modular flow analysis research and structure optimization by using Moldflow software
1 Modular flow analysis Using Moldflow software
Firstly, a three-dimensional model of a curved surface window product is established by UG software, the established three-dimensional model of the curved surface window product is led into Moldflow software, a Fusion format is selected for grid division, and defects of grids are corrected.
TABLE 1 summary of product analysis data
Second, process parameter setting
Firstly, the mould temperature is 60 ℃ as a default value of software. Three temperatures of 60 ℃, 70 ℃ and 80 ℃ are respectively selected according to molding materials, different filling states are compared through simulation of the software under the condition of 3 mold temperatures, and finally, a proper mold temperature is determined to meet the IMR molding requirement (see the analysis of mold flow).
② the material temperature-the software default value is 245 ℃. Selecting the material to be 210 ℃ according to the molding material;
and forming period-software default value is 30 sec. Because the module flow analysis is adopted, the automatic calculation is adopted.
1) Flow analysis arrangement
Fill control-select default (automatic control);
the injection molding machine is automatically controlled from a speed control to pressure control switching point, namely a software default value;
pressure control of pressure maintaining, namely a curve control method with a software default value of pressure maintaining pressure and filling pressure of a V/P conversion point being associated;
selecting polymethyl methacrylate (PMMA) as an injection molding material;
fifthly, the model of the injection molding machine is defaulted by software;
sixthly, selecting 718H as mould material
Finally, as shown in the table 2,
TABLE 2 analysis of set data
2 run protocol analysis
Analysis of "best sprues": first, the "best gate" analysis is performed using the "unrestricted gate node", and as a result (see fig. 2), the best gate position should be the circled area in the middle of fig. 2. However, the material is transparent PMMA, and the surface is an appearance surface and a glue opening cannot be placed. Therefore, after the "gate node restriction" is performed on the middle area (fig. 2) of the product, the "best gate" analysis is performed, and as a result, it can be seen in fig. 2 that the flow resistance is the smallest at the middle position and the flow resistance is the largest at the two short side positions, so that the best gate is selected as the long side of the product.
And (3) feasibility analysis of different mold temperature schemes, namely setting three mold temperatures of 60 ℃, 70 ℃ and 80 ℃ respectively for comparing the influence of different mold temperatures on the melt filling state and the relationship among the different mold temperatures, analyzing and judging the melt flowability, the pressure drop and the formability of the material under the 3 mold temperature conditions through software, and finally determining a proper mold temperature to meet the IMR forming requirement.
According to the analysis result of the 'best gate', the best gate of the curved surface window product is selected to be the long side of the product. Therefore, glue feeding positions (two long sides and one short side) are selected at 3 positions of the product respectively, as shown in fig. 3.
The comparison of feasibility windows of three glue feeding schemes at three die temperatures of 60 ℃, 70 ℃ and 80 ℃ can be seen: the feasibility of the window forming of the product at three die temperatures is high; the feasibility of the three glue feeding schemes is relatively maximum when the mold temperature is 80 ℃, and the actual molding requirements are met.
Pressure drop comparison according to the three schemes; the higher the temperature of the die is, the lower the forming pressure of the product is, the forming pressure is compared with the internal stress of the product, the lower the forming pressure is, the lower the internal stress of the product is (PMMA belongs to brittle plastics and has lower resistance to the internal stress), the product belongs to the most main appearance surface and is transparent, and the increase of the die temperature greatly helps to improve the quality of the product.
The analysis of the optimal glue feeding point is that a single-nozzle hot runner and a mold with two outlets are initially set in the Moldflow software, gate glue feeding is respectively arranged at the positions 1/2 and 1/4 of the long side surface of a product (scheme 1 and scheme 2 in the figure 3), and then a casting system model is established for mold flow analysis. Both the products of the scheme 1 are filled in balance, but the gate of the scheme 1 is too close to the wall thickness area, the melt filling can fill the easy filling area firstly and then fill the difficult filling area, so that the thin wall area can hardly obtain enough shear heat to resist the solidification of the melt, and the products of the scheme 1 are shot; the contour line of the local position of the product in the scheme 1 is too dense, which shows that the material flow has retention phenomenon at the position and is not preferable; in the scheme 2, the filling speed of the product is basically consistent, and the product is filled at a constant speed and smoothly, so that the smooth filling of the product is ensured and the higher appearance of the product is obtained; the temperature difference of the wavefront of the product is not more than +/-10 ℃ of the set temperature; in the scheme 1, the temperature drop of the thin-wall region of the side wall of the product is already as low as 103 ℃, the short shot risk exists, and the appearance can feel obvious difference when the material temperature difference is too large; scheme 2 the temperature drop of the product front edge is totally within 10 ℃, and high appearance quality can be obtained.
In conclusion, according to the scheme 1, the filling time of the product is about 2.99s, the product is retained and shot in a local position, the difference of the temperature difference of the front edge is large, the quality of the local position of the product is reduced, the service life of the product is severely limited after the product is assembled, and the scheme is not recommended; scheme 2 the filling time of the product is about 3.58s, the product is filled smoothly without obvious detention, the short shot area is formed, and the temperature difference of the front edge of the product is within a tolerance range, so the scheme is recommended to be adopted. Finally, the scheme 2 is determined as the "best glue inlet point". The scheme has stable filling, small impact on the diaphragm, can obtain IMR products with higher quality, and has excellent forming conditions.
3 product Modular flow analysis
The data is prepared by theoretically minimizing the internal stress and anisotropic mechanical properties of the thermoplastic at a shear rate γ of 5 × 102 to 5 × 103S-1, and the molecular weight, temperature, shear rate, shear stress, humidity, etc. of the melt have no significant effect on the viscosity and relaxation properties. The gate size was determined by substituting the above data into the empirical formula γ — 3.3Q/π R3 (where R is the equivalent radius and Q is the volumetric flow rate of the product): 15mm long by 1.2mm wide. In the same principle, the diameter of the hot runner is set to be phi 12, and the diameter of the branch runner is set to be phi 8.
TABLE 3 Runner and gating schemes
After the above data and parameters are set, the analog flow simulation process can be performed.
(1) The curved window product completed the entire melt fill in 3.580 s. Through software dynamic observation, the flowing condition of the plastic melt in the mold cavity can be clearly seen, and from the result of filling time, the flowing of the plastic melt of the product is smoother and more balanced, which indicates that the selection of the position of the pouring gate is more reasonable.
(2) And an injection pressure XY diagram expressing the change of the pressure at the pouring gate in the whole process of injection, pressure maintaining and cooling. The pressure of the curved surface window product is reduced from 53.46MPa to 80 percent, namely 42.77MPa, before and after the V/P conversion point, the pressure maintaining pressure is reasonably reflected and executed, and the pressure maintaining effect at each part of the product is good.
(3) The product filling contour line is uniform, the screw curve and speed are set reasonably, the filling is smooth, and no obvious detention and short shot region exist. The wavefront temperature of the product is basically controlled to be about 10 ℃, short shot cannot occur, and poor appearance and warping caused by temperature difference cannot occur; the projection area of the plastic part in the mold opening direction is 257.58cm2The mold clamping force required in the filling stage was 83T, and the mold clamping force increased with the increase in the holding pressure. Generally, the safety factor increased by about 20 percent is recommended to select a proper injection molding machine for production during production; therefore, the 120Ton injection molding machine meets the production requirements.
(4) The maximum shear rate of the material is 400001/S; the product gate position shear rate 124491/S is lower than the material decomposition value, and the gate size is designed reasonably.
(5) The appearance surface of the product basically has no weld line, the hole site characteristic cannot be avoided, the temperature of the front edge of the product is higher, the mold temperature is set to be 80 ℃, the weld line can be basically eliminated, and the appearance and the quality of the product are not influenced.
(6) The maximum deformation in the X direction of the article is about 0.59+ 0.59-180X 0.6% (length shrinkage of article) 0.1, about one side 0.05 MM. ② the maximum deformation of the product in the Y direction is about 0.26+0.26-72 x 0.6% (length shrinkage rate of the product) is 0.09, about one side is 0.045 MM. ③ about 0.11+0.21-3.6 x 0.6% of the maximum deformation of the article in the Z direction (shrinkage of the article length x 0.3, about one side 0.15 MM).
The above is based on the superior process warpage results. The analysis result provides a basis for further optimizing the product and performing deformation control and compensation in the mold design process, and the actual warping value is generally larger than that of analysis. The main reason for the influence of the curved surface window product on the warping deformation is molecular orientation, and pressure maintaining pressure and time adjustment should be added in the actual production.
4 modular flow analysis results
The process parameter setting in the Moldflow software includes all relevant equipment such as a mold and an injection molding machine, and process parameters such as cooling, pressure maintaining, mold opening and closing, the process parameter setting in the Moldflow software actually theorizes the actual manufacturing process and equipment, then applies the Moldflow analysis of the Moldflow software, considers the flow result, optimizes and adjusts the preset process parameters, then applies the Moldflow analysis of the Moldflow software, and finally selects the theoretical process parameters as shown in table 4:
TABLE 4 Moldflow die Structure and Process parameter Table
To sum up
1) The product filling time is 3.58s, the product filling is smooth, the speed is uniform, no obvious retention and short shot region exists, the filling is balanced, and the parts can be guaranteed to be fed after being sequentially frozen from the pouring gate to the filling tail end; (ii) a
2) The injection pressure is 53.46Mpa, and the maximum mold locking force is about 82.55T; the mold locking force is increased along with the increase of the pressure maintaining pressure, the safety factor increased by about 20 percent is recommended to select a proper injection molding machine for production, and the injection molding machine 120T meets the requirement of product filling;
3) the temperature of the front edge of the appearance surface of the product is reduced to be within 10 ℃, and the quality defect and short shot risk of the appearance surface caused by temperature difference are avoided;
4) the deformation of the product is mainly caused by uneven volume shrinkage, and the subsequent die test is improved by optimizing a forming process, adjusting the water temperature before and after the adjustment, and the like;
5) the maximum shear rate is 12449/s, the maximum shear rate of the material is not exceeded;
6) a curved surface window mould single-nozzle hot runner and a first mould outlet are arranged, and a pouring gate is arranged at the position 1/4 of the long side surface of a product for glue feeding; the diameter (small end) of the main sprue is 3.2mm, and the taper is 3 degrees; diameter phi of the bypass is 8 mm; the length of the gate is 15mm, and the width is 1.2 mm.
Product structure analysis with curved surface window
1 analysis of curved surface window product structure
1) The product material is as follows: PMMA has better fluidity and can be better filled and formed;
2) and (3) wall thickness of a product: 1.5 mm-3.6 mm meets the requirement that the minimum thickness of an in-mold transfer product is required to be more than 1.0 mm;
3) P.L side (1): when the film is pressed and fixed by a die during molding, if the P.L surface is changed rapidly, the film is easy to crack and wrinkle, so that P.L is better as close to a plane as possible, and a rapid height difference is avoided as much as possible. The whole appearance of the display window product is smoother, and the transfer printing film covering surface is a plane, so that the P.L surface is a plane, and has no sharp height drop, and the film can be better prevented from cracking or wrinkling.
4) Designing the height and the outer side wall: since the P.L side of the product was substantially the same as the transfer film side, the product was not coated on its side edges. Therefore, the product height and the side wall structure size of the product do not influence the transfer.
5) Designing inner holes and hole distances.
6) And (5) designing a corner.
7) The product has no protruding rib thickness difference, and can prevent shrinkage mark on appearance surface.
2 Process of manufacture
According to the technological requirement of in-mold transfer printing (IMR) and the above structural analysis to the curved surface window product, the curved surface window product has better in-mold transfer printing (IMR) manufacturability, to sum up, the research scheme of the curved surface window product is:
1) developing an in-mold transfer printing technology mold for a display window product;
2) purchasing a set of film feeding equipment (used for inserting a transfer film into a mold and implementing high-speed positioning of a transfer position), and finally determining that a manufacturer is Shanghai Yuyang equipment Co., Ltd.;
3) customizing auxiliary materials such as transfer printing films and the like, wherein the final diaphragm manufacturer is Shanghai Yuhui material company Limited after being searched;
4) selecting the model of the injection molding machine according to the size of the product and the size of the film feeding machine; HTF200W1/J5
5) And (4) carrying out equipment installation and debugging, process adjustment and trial production on the injection molding machine bed.
3 mold design
The mould structure of the curved surface window product has the main structure (two-plate mould, one mould with two cavities, forming mould core adopting insert embedding mode, etc.) of the traditional mould and the mould structure special for IMR process.
The curved surface window mold utilizes UG software to carry out mold structure design, and the designed injection mold structure is shown in figure 4 and table 5.
TABLE 5 mould list
(1) Ranking position
According to the dynamic observation of the process of the Moldflow mold flow analysis software, the flowing condition of the plastic melt in the mold cavity can be seen, in order to ensure the smooth and balanced flowing of the plastic melt of the product and control the warping deformation of the product, two products are arranged at the middle symmetrical position during the arrangement, and are arranged in the middle according to the shape of the product in the symmetrical direction, so that the flowing orientation of molecules is conformed and the uniformity of glue feeding is ensured. Therefore, in the design, the 3D model of the product is introduced into UG software, multiplied by the shrinkage rate, and then the mold cavity is determined to be 1 multiplied by 2 according to the size and the structure of the product.
(2) Pouring system
The runner system generally consists of a main runner, a sub-runner and a pouring gate. The movable mould of the transfer mould with the curved surface window is provided with a film feeding mechanism, a film pressing mechanism and the like. Conventionally, if the mold feeds glue from a fixed mold, film feeding and pressing are difficult to realize, so the whole mold structure needs to be designed into a flip mold during design. The mold ejection mechanism is arranged on the fixed mold, and the mold foot pad is empty, so that the curved surface window mold is designed in a mode that the lengthened hot nozzle directly penetrates into the male mold core from the panel and then the runner is rotated.
1) Main runner
Because the fixed die of the curved surface window die adopts a mechanism for ejecting by two groups of oil cylinders, a main runner of the die adopts a single-point lengthened hot nozzle to directly penetrate into a core of a male die from a panel to enter a die core, and then the runner is divided. In order to ensure better fluidity and smaller pressure drop, the hot runner adopts phi 12 diameter to achieve better filling effect according to Moldflow mold flow analysis.
2) Flow-dividing channel
Generally, the shape of the branch flow channel is circular, trapezoidal and the like, and in order to reduce the loss of pressure and heat, the circular flow channel is the optimal flow channel shape. When the parting surface is a plane or a curved surface, a circular flow passage is mostly adopted. When a runner with multiple cavities is arranged, the uniformity of pouring is fully considered, and the pouring is balanced as much as possible. In addition, when the size of the runner is designed, the factors such as the size of a product, the wall thickness, the material flowability and the like are fully considered, the runner of a material with poor flowability is correspondingly enlarged, the section size of the runner is necessarily larger than the wall thickness of the product, and meanwhile, the proper length of the runner is designed.
In order to ensure that the plastic has better fluidity and reduce pressure loss, the curved surface window mould adopts S-shaped arrangement. In the Moldflow modular analysis, the ideal effect can be achieved by using a phi 8 runner. In addition, in order to facilitate the demoulding of the stub bar, the phi 8 runner adopts the design and processing of the combination of the movable mould and the fixed mould.
3) Pouring gate
The design of the gate is directly related to the flow of the melt in the cavity of the mold, the orientation of the plastic polymer molecules and the deformation and warpage of the product after molding, and further the product quality is influenced. Therefore, a reasonable gate size is very important in plastic mold design. Generally, the design of the gate needs to ensure the balance of the flow of the melt; less surface defects; better product strength; the temperature distribution is uniform in the injection molding process.
Because the parting surface of the curved surface window mold is a plane, the side surface of a product is allowed to have glue feeding traces, so that glue is fed by adopting a side gate, when the position of the gate is selected, the appearance requirement of the product is considered, phenomenon of the product is prevented from being left, glue is fed from a thick place and the end surface, the gate is prevented from being over against a mold core and colliding through positions, and the deformation of the mold core due to impact is prevented.
In the previous Moldflow die flow analysis, the optimum glue injection point of the product is about 1/4 points on the long side of the product through the analysis of an "optimum gate", and the gate size is 15mm in length and 1.2mm in width. The melt filling process is stable, and the deformation size under the pressure keeping pressure is controlled in a small range.
(4) Mold core structure
In injection molding tools, the plastic melt fills the cavity at high pressure during the injection process. Under this pressure, the mold cavity gradually expands and deforms. The amount of deformation of the mold cavity increases with increasing cavity pressure and cavity size. Generally, the wall thickness of the cavity core is calculated based on the maximum pressure of the cavity. The main technical requirements of the curved surface window product are the requirements of dimensional accuracy and surface accuracy, therefore, the rigidity condition of the side wall of the cavity of the product is obtained by taking the dimensional tolerance value of the plastic part as the allowable deformation value and by an empirical formula or table lookup.
The structural design of the mold core is mainly convenient for processing, assembling, using and maintaining the mold on the premise of ensuring the quality requirement of the plastic part.
The cavity is a mold part for molding the outline of a product, and the structure of the cavity is related to the shape, the size, the use requirement, the production batch, the processing method of the mold and the like of the product. The curved surface window mold adopts an embedded type cavity, and is characterized by simple structure, firmness, reliability and difficult deformation, no splicing trace on the surface of a molded product, and contribution to reducing the overall structural size of the whole mold. Numerical control machining is mainly adopted. In addition, the core structure is comparatively simple in this design, and the degree of depth is not big, also adopts embedded core. The mold core is convenient to process and maintain. The matching of the mold core and the mold plate is H7/p 6.
The main factors influencing the size precision of the plastic part include the shrinkage rate of the plastic part, the manufacturing error of the mold forming part, the abrasion of the mold forming part and the error in the aspect of mold installation and matching. Generally, the working size and the precision grade of a molded part are determined according to the size and the precision grade of a plastic part, the working size of the mold part is calculated only by considering the shrinkage rate of plastic when a mold is designed, and the manufacturing tolerance of the mold and the maximum abrasion loss of the mold molded part in use are empirically estimated.
The calculation formula of the working size of the die forming part is as follows:
A＝(1+&)B
wherein A is the size of the mould forming part at normal temperature
B-actual size of plastic part at normal temperature
Average shrinkage of & -plastic part material
The existing mold design adopts a design mode of introducing a 3D model of a product into UG software, releasing shrinkage (shrinkage rate) and then performing mold splitting.
The tolerance value of the working dimension of the molded part is 1/3-1/4 of the tolerance of a plastic part, or IT 7-8 grade is taken as the manufacturing tolerance of a mold. The minimum size of the die cavity is the basic size, and the deviation is a positive value; the maximum size of the mold core is the basic size, the deviation is a negative value, the center distance deviation is in bidirectional symmetrical distribution, and the numerical control equipment is used for programming control.
(4) Cooling system
The mold temperature directly affects the filling, pressure maintaining and cooling of the plastic, the shape of the plastic part and the precision of the product. The main factors influencing the cooling effect of the mold are as follows: the material of the mold, the distribution of the cooling circuit, the temperature and state of the cooling liquid, the molding material, the thickness of the workpiece, the temperature of the mold, etc. The cooling time is generally determined based on the thickness of the part, the molding material, and then the diameter and length of the cooling circuit is determined based on the cooling time required.
The molding material of the curved window product is PMMA, the surface requirement is higher, water transportation is arranged in the direction of large product shrinkage, on the premise of ensuring the strength of the mold material, the cooling water holes are as close to the cavity or the surface of the mold core as possible (the minimum size of the cooling water holes and the surface of the cavity of the mold is 24mm), and the molding product is arranged uniformly and the diameter of the molding product is equal toAnd the diameter of the water channel in the whole waterway is kept the same, thereby avoiding the influence on the cooling effect due to uneven flow velocity.
The die moving die adopts that each cavity is independently provided with an annular water channel (see figure 5), and the distance between the water channels is 35 mm. In addition, the fixed die of the die adopts a tower-type waterway (see figure 6), and the diameter of the water towerDepth 25 mm.
(5) Ejection mechanism
The process of ejecting the plastic part from the mold is called ejection, and the mechanism for ejecting the plastic part from the molded part is called a mold-releasing mechanism. The demoulding mechanism mainly comprises an ejector rod, an ejector rod fixing plate and a push plate (comprising a guiding part and a resetting part).
For the demoulding mechanism, the selection principle is as follows: the plastic part does not deform when being demoulded; the thrust distribution is reasonably arranged according to the size of the demoulding resistance; the strength and rigidity of the push rod are enough, the stress of the push rod cannot be too large, and the push rod does not generate elastic deformation when pushed out; the push rod position mark does not influence the appearance of the plastic part.
The ejection mechanism is divided into a mechanical ejection mechanism, a hydraulic ejection mechanism and a pneumatic ejection mechanism according to the power source of the ejection action. The pushing mechanism can be further divided into a push rod pushing mechanism, a sleeve pushing mechanism, a push plate pushing mechanism, a push block pushing mechanism, a pushing mechanism utilizing molded parts, a multi-element comprehensive pushing mechanism and the like according to the types of the pushed parts.
The mold is designed to be of a flip-chip mold structure, and the ejection mechanism adopts an oil cylinder to drive an ejector rod to eject.
In this design adoptThe distribution of the large push rods and the small push rods is shown in FIG. 7, and the push rods are uniformly distributed on the periphery of the product and have holes; the end plane of the ejector rod should not axially move during design. The fit clearance between the ejector rod and the ejector rod hole is not larger than the used flash clearance, and is generally H8/f8 fit, so that flash is avoided.
(6) Flip-chip mold structure
The transfer printing film is arranged on the parting surface of the curved surface window product, the transfer printing film is punched out by directly feeding glue, the transfer printing film is punched and wrinkled, and the pattern is also punched, so that the curved surface window mold is not suitable for adopting a direct glue feeding mode and combining with a mold flow analysis result of Moldflow software, and the curved surface window mold adopts a fan-shaped glue feeding mode. In addition, the mold structurally adopts an inverted mold, namely a male mold part of the mold is arranged on a fixed mold plate surface of an injection molding machine, a female mold part of the mold is arranged on a movable mold plate surface of the injection molding machine (the structure is opposite to that of a common mold), a lengthened hot nozzle penetrates through a panel, mold feet, a top plate and an ejector rod fixing plate to rotate a fan-shaped sprue on a male mold insert for glue injection in a fixed mold (male mold) part of a curved surface window mold, the ejection of a product and the resetting of the ejector rod are controlled by the injection molding machine through an external oil cylinder in the fixed mold (male mold) part when the product is ejected (see figure 4), the outer diameter of the lengthened hot.
(7) Suction channel design
In order to ensure that the position of the transfer film is fixed in a cavity during injection molding of the transfer film and the phenomenon that the transfer film is extruded by plastic materials to move does not occur, the transfer film is firmly adsorbed in the cavity by adopting a vacuum air suction mode, therefore, the curved surface window mold is designed and arranged in the cavity of the mold and is provided with 2 multiplied by 23 air suction holes with the diameter of 2mm, the air suction holes are connected into an air suction channel by processing a ring groove, an external vacuum pump and a change-over valve are adopted, when the transfer film is conveyed in place, the vacuum pump is started to suck air, the transfer film is firmly adsorbed in the cavity through an air suction channel and an air suction channel under the joint cooperation of a film pressing mechanism, and the position of the transfer film in.
When in design, the distance from the appearance of the product to the center of the transverse air suction groove is 8 mm; the shape and size of the transverse air suction groove are 2.3 wide, 4.0 deep and R1.0 at the inlet; the center of the transverse air suction groove at the female die side is provided with a phi 2 air suction hole. In addition, an air suction groove is designed and processed on the back of the female die, and the shape and the size of the air suction groove are 4mm in width and 2mm in depth; for the convenience of air suction, the processing air storage cylinder is designed and has the size of (15 multiplied by 25 multiplied by 6).
(8) Design of film pressing mechanism
In order to realize the compression and adsorption of the transfer film and ensure the position fixation of the transfer film in a mold cavity, the transfer film does not move during injection molding, and a set of film pressing mechanism is designed and manufactured on the movable mold (female mold) part of the curved surface window mold and is linked with a machine tool. The film pressing mechanism is formed by buckling and connecting four pressing blocks subjected to heat treatment quenching into a rectangular frame, in order to ensure the flatness of the bottom surface of the pressing frame and ensure that air does not leak during film pressing, the whole bottom surface is ground, and two rings of whole sealing rings (ensuring that the width of the O-shaped groove from the end surface of a film to the center of the O-shaped groove is more than 9mm, and the width of the O-shaped groove at the back of the film pressing plate is 3.7 and the depth of the O-shaped groove is 3.2) are processed and installed at the position of a. The film pressing mechanism is connected with the push rod of the movable mold through four overlapping blocks. In order to ensure the stability of the film pressing mechanism during film pressing, the movable mold push rod and the movable mold plate are processed by matching H7/g6, and a guide pillar and a guide sleeve are processed and assembled on the movable mold bottom plate, so that the stable movement of the movable mold bottom plate is ensured, and the stable movement of the film pressing mechanism is further ensured.
The film pressing mechanism is provided with four pressure springs. When the ejector rod of the injection molding machine is ejected, a movable mold bottom plate (compressing four pressure springs) is pushed to move, and a film pressing mechanism is driven to be separated from a diaphragm; when a film is required to be pressed, the ejector rod of the injection molding machine returns, the four pressure springs return, the film pressing frame is driven by the pressure of the four pressure springs, the film is compacted on the sealing ring, and the sealing effect is achieved.
(9) Sprue cooling design
The mold temperature directly influences the filling, pressure maintaining and cooling of the melt, the shape and precision of the plastic part and the like, the plastic has different varieties and different requirements on the mold temperature, and whether the mold temperature is properly designed directly relates to the production cost and the economic benefit. In general, when the cooling of the mold is considered in the design of the mold, the whole body or surface of the mold is usually considered on the punch, die or insert slide of the mold. For the in-mold transfer mold, the balance requirement for cooling of the entire mold is higher due to the particularity of IMR. For a curved surface window mold, as a hot nozzle rotating fan-shaped gate glue feeding mode is adopted, the heat of the gate position is large, the heat of the cavity surface of the mold is uneven, and transfer color difference can occur. Therefore, in order to eliminate the defect, the cooling water holes with the diameter of 16 are designed on the female die side below the glue opening, the distance from the front ends of the water holes to the female die surface is 8 +/-0.5, and a good temperature balancing effect is achieved.
(10) Mold base design
Through the design, the outline dimension of the curved surface window die is 550x540x421, and different from the design of a conventional die, because a transfer printing film passes through between the concave-convex die, the parting surface gap needs to be ensured to be 0.07mm of the thickness of the diaphragm. In order to meet the requirement, the clearance between the movable mould and the fixed mould is adjusted by an adjusting block, so that the molding surface cannot escape when the mould is closed, and the transfer printing film cannot be crushed; of course, in addition to parting, the template should be designed to process the film through the slots. The transfer printing film can move smoothly, and in addition, because the size of the film pressing mechanism is higher than that of the movable mold, the space avoidance treatment is carried out on the fixed mold part;
the film feeding machine is selected according to the size of a curved surface window product, and the thickness of the side die of the moving die of the curved surface window die is controlled below 230mm due to the limitation of the sizes of the film feeding and winding arms of the film feeding machine, so that the correct installation and use of the die can be ensured.
Third, optimization of test mould and production process of curved surface window product
1. In the early stage of product development, according to the process:
ordering a set of film feeding equipment (for inserting a transfer film into a mold and performing high-speed positioning of a transfer position), and finally determining that a manufacturer is Shanghai Yuyang equipment Co., Ltd.;
customizing auxiliary materials such as transfer printing films: the final film manufacturer is searched for "Shanghai Yuhui Material Co., Ltd";
one injection molding machine is ordered according to the size of the product and the size of the film feeding machine. The model is as follows; HTF200W 1/J5.
2. Die mounting
1) Before the die is installed, the left upper electric eye is checked, whether the die installation is influenced by the upper and lower optical fiber extending devices, and if the die installation is influenced, the fastening screws of the upper and lower optical fiber extending devices are loosened for adjustment;
2) after the mold is well assembled and leveled, the mold is firmly fastened and locked.
3. Packaging transfer film
1) Turning the injection molding machine to manual and turning off the injection molding machine motor;
2) threading a transfer printing film;
3) the positions of the upper left optical fiber, the upper optical fiber and the lower optical fiber are well adjusted, so that the positions of the upper left optical fiber, the upper optical fiber and the lower optical fiber are closest to the mold, and errors caused by shaking of the transfer printing film are reduced.
4. Machine adjusting
1) The mould is slowly opened at low speed and low pressure, and the opening and closing positions of the mould are adjusted until the ejector pin of the fixed mould of the mould is opened to a proper position, namely the maximum opening and closing position of the mould.
2) Adjusting the position of a thimble of the movable mould, and slowly ejecting the thimble at a low speed and a low pressure until a movable mould pressing frame is ejected to a proper position;
3) opening the material temperature, connecting a water pipe and an air pipe of the mold and opening the mold temperature;
4) connecting with a temperature controller, and heating the hot nozzle of the mold.
5) And after the temperature reaches the set temperature, adjusting the parameters of the injection molding process.
5. Trial production
1) Entering a film feeder page under the condition of approximately aligning and centering through a single action mode, and clicking an automatic operation button to perform trial production of a first die;
2) after the first die comes out, whether the pattern position has the conditions of upward deviation, downward deviation, leftward deviation, rightward deviation and the like is checked, if so, the positions of the three optical fibers are continuously adjusted, the next die is continuously produced until the pattern position is centered, and then the forming process parameters are adjusted until the size and the appearance of the product meet the requirements of a drawing.
6. Process parameters
Generally, the Moldflow software provides a target trend for the product process performance through main injection molding processing parameters such as melt temperature, mold temperature, injection time and the like, thereby helping injection molding to determine the correct values of all processing parameters and determine the variable ranges thereof, and obtaining a stable molding process condition. At this time, when a curved surface window product is tested, a section of numerical value of each injection molding process parameter is determined according to the process parameter obtained by Moldflow simulation, and then two sections, three sections and a termination numerical value of each process parameter are set by combining actual experience.
For example, injection pressure: the parameter obtained by simulation is 53.46Mpa, which is set as a value of 55Mpa (taking an integer) for a first section of injection pressure, and then a second section of value is set as 60Mpa and a third section of value is set as 35Mpa according to experience. (ii) a And for the injection molding position, the injection molding position is distributed according to the weight of the product and the length of a screw of the injection molding machine and the pressure conversion ratio, wherein one section is set to be 43mm, the other section is 28mm, and the other section is 35 mm. Similarly, the values of opening and closing the mold, the temperatures of the molten rubber and the charging barrel and the like can be set.
Therefore, in the production process of the product, the actual process parameters and the theoretical process parameters have adjustment and optimization differences, and finally the table 6 shows the production process parameters of the curved surface window product, and the picture 8 shows the qualified product.
7. Product detection
The product detection of the curved surface window product has two parts of performance test and appearance inspection. In the stage of sampling, after the mould testing process is stable, 10 samples of 5 moulds are extracted at intervals for detection. In the performance test, through the detection of 8 items, the curved surface window in-mold transfer printing product is qualified and meets the IMR performance requirement.
TABLE 7 Performance test
And (3) appearance detection conclusion:
1. aiming at the problems of offset of printing patterns and inaccurate positioning of a mould and a membrane,
1) processing the whole appearance of the die by taking the movable die plate of the die as a reference, and calibrating the die level by using a level gauge during production;
2) processing and installing marking blocks at the upper end and the lower end of a movable template of the die, and positioning the die and the diaphragm;
it can be seen that, by adopting the above method, the offset value is obviously reduced, the manual adjustment times are reduced, the production efficiency is obviously improved, and the positioning precision is further ensured.
2. Aiming at the problem of printing pattern adhesion, the industry adopts a method for detecting unqualified product printing adhesion, which comprises the following steps: in a certain pattern area range, a 3M adhesive tape is stuck to a printing part, the part is kept for 60S +/-30S, then the adhesive tape is quickly pulled up in the direction of 45 degrees, and the test is carried out for three times continuously. If the area of the coating which is stuck and thrown by the adhesive tape accounts for ≧ 20% of the area of the printed pattern, the adhesive force of the product is judged to be unqualified. And if the area of the coating which is pasted and thrown by the adhesive tape accounts for ≧ 10% of the area of the printed pattern, judging that the adhesive force of the product is unqualified secondarily. If the area of the coating layer spun by the adhesive tape accounts for less than or equal to 5% of the area of the printing pattern, the adhesive force of the product is judged to be qualified.
When a curved surface window product is tested by the method at the beginning of die testing and proofing, the coating area which is adhered and thrown by the adhesive tape accounts for not less than 20% of the area of the printed pattern, and the white adhesive force of the product which is stripped by the deviation correcting line is unqualified. Therefore, in the trial mold, the adhesion capability of the product is improved by adjusting the injection molding process parameters. Generally, the adhesion of the product is mainly related to the parameters of mold temperature, material temperature and injection pressure. But the parameters can not be improved without limit, and too much improvement can influence the cooling and shaping of the product, thereby increasing the product shaping period and reducing the production efficiency. And adjusting process parameters, wherein when the mold temperature, the material temperature and the injection pressure are increased, the ink sticking and throwing area is gradually reduced. When the temperature of the die is 70 ℃, the material temperature is 220 ℃, and the injection pressure is 43MPa, the sticking area is reduced to 5 percent, the product is qualified, and the adhesive force of the product pattern meets the requirement.
3. Aiming at the decolorization of the product surface and the washing of the printing ink
In the production process of the prior period, the phenomenon that the printing ink of the membrane is washed and the appearance defect of the product occurs. Generally, the surface of a product is decolored because a membrane cannot normally cover the surface of a plastic part or the membrane is washed by ink, and if a gate is small in size and faces a cavity with large width and thickness in the design of a mold, when high-speed plastic melt passes through the gate, the melt fracture phenomenon can be generated because of high shearing stress. Sometimes, the plastic melt is jetted from one end of the cavity to the other end of the cavity to cause defects such as corrugation of the product, and the jetting also causes the gas in the cavity to be difficult to discharge, thereby forming bubbles in the product or burning the plastic product. Therefore, attention and inspection are required in the injection molding process and mold:
1) whether the design of the water gap is reasonable or not and whether the film punching phenomenon is caused by pressure concentration or not
2) Whether the surface of the die and the part are greasy or not
3) Whether the material temperature and the front mold temperature are low or not
4) Whether the injection molding parameters of the injection molding machine are set reasonably
Because the product is in a flat plate shape, the sprue directly faces the large surface of the cavity during early design, and the phenomena of ink scouring and product surface decoloring appear in the product during injection molding. In order to solve the problem, a boss with the length of 15, the width of 1.5 and the height of 0.3 is additionally arranged at the front end of the gate rubber inlet, so that high-speed melting material impacts the boss, the flow rate is reduced, the plastic flow direction is changed, the defect is overcome, the product performance and the qualification rate are improved, and the product can be produced in batch.
4. For product cracks
The curved window product has 23-phi 1.8 small holes which are distributed unevenly on the product. In the initial stage of the die design, the influence of the packing force on the ejection is not large due to the consideration of the small holes of 23-phi 1.8, so that the ejector rod arrangement is arranged as shown in FIG. 7 in the die design.
When the mold is tested and sampled, after the mold is demoulded, the hole of the product is easy to crack, and the defect can be relieved by using the demoulding agent in the production of the test mold. Through the analysis to the cracked product, because this curved surface window product molding material is PMMA, the material fragility and this product shape are the flat form, and the shaping has more aperture, arranges little ejector pin and carries out ejecting. If the hole packing force and the product ejection force are not uniform or ejection imbalance occurs in manufacturing and assembly, the product is easy to crack after demoulding. The mould ejection mechanism is rearranged and processed with high difficulty, so that the whole mould is possibly scrapped, the problem is solved, the demoulding inclination of the small hole at the position where the product is easy to crack is further increased, the included angle between the hole demoulding direction and the product demoulding direction during small hole demoulding is reduced, and cracks caused by the influence of unbalanced ejection of the small hole are reduced. The results of the test of the draft angle and the number of the cracked holes are shown in Table 8.
TABLE 8 draft angle and crack hole analysis data
Through the modification, the small-hole demoulding inclination is increased to 2 degrees from the original conventionally set 0.5 degree, the cracking problem of the maintenance mould is solved, and the production of products in each batch is not carried out by using a demoulding agent any more.
5. For product deformation
TABLE 9 product Process parameter adjustment
Finally, the pressure maintaining pressure is set to be 35MPa, the pressure maintaining speed is set to be 15cm3/S, the pressure maintaining time is 2S, and the total deformation and all-directional deformation of the display window product are well controlled.
Claims (5)
1. An in-mold injection molding method of a curved surface window is characterized in that: the method comprises the following steps of firstly, performing modular flow analysis research and structure optimization by using Moldflow software; the method comprises the following steps of a, modeling: establishing a three-dimensional model of a curved surface window by UG software, importing the established three-dimensional model of the curved surface window product into Moldflow software, and optimizing a mold structure; b. parameter analysis and determination: analyzing and researching the melt fluidity, pressure drop and formability of the material of the product under the conditions of different mold temperatures and different glue feeding positions by using Moldflow software, and determining the optimal glue feeding point of the curved surface window product; under the conditions, the filling time, the injection pressure, the mold locking force, the deformation of the product and the like of the product are subjected to simulation analysis;
step two, designing a curved surface window IMR mold: according to parameter data analyzed by Moldflow software, and in combination with a special mould structure of an IMR (in-mold labeling) process, UG (Unigraphics) software is used for designing and optimizing the arrangement position, the pouring system, the air suction channel, the film pressing mechanism and the cooling system of the mould;
step three, the optimization of the mould testing and production process of the curved surface window product: and (3) testing the mold, namely performing process adjustment by analyzing the installation, machine adjustment and sample process of the mold and equipment and taking parameter data analyzed by Moldflow software as an actual process basis, performing analysis test on the performance and appearance of a sample product, and finally determining the injection molding method.
2. The method of claim 1, wherein the method comprises: in the first step, the Moldflow die flow theory process parameters are as follows: and (3) mold temperature: 80 ℃, melt temperature: 220 ℃, injection pressure: 53.46
Mpa, clamping force: 82.55T, fill time: 3.580sec, cooling time: 20sec, maximum shear rate: 12449/s.
3. The method of claim 1, wherein the method comprises: in the third step, the actual production process parameters are as follows: temperature of the die: 80 ℃, melt temperature: 210 ℃, injection pressure: 55Mpa, clamping force: 95T, filling time: 4sec, cooling time: 18sec, dwell pressure: 35 MPa.
4. The in-mold injection molding method for the curved window according to any one of claims 1 to 3, wherein: the pouring system is a flip-chip mold, and the pouring is carried out in a mode that a lengthened hot nozzle directly penetrates into a male mold core from a panel and then a cold runner is carried out.
5. The method of claim 4, wherein the method comprises: when the pressure maintaining pressure in the third step is 35MPa, the pressure maintaining speed is 15cm3And/s, dwell time 2 seconds.
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