Injection molding method and system for doll toys

Abstract

The invention discloses an injection molding method and system for a figurine toy, comprising: filling: first closing the injection mold, and then squeezing a high-temperature melted plastic raw material into a mold cavity to fill the mold cavity; maintaining pressure: pressurizing the mold cavity and maintaining pressure; cooling: cooling the injection mold to cool and solidify the plastic product in the mold cavity; opening the mold: opening the injection mold to eject the molded figurine toy product. When the surface residual stress of the molded figurine toy does not meet the standard, the cooling water flow and the cooling water temperature can be quickly adjusted to adjust the injection molding to obtain a figurine toy with a surface residual stress value that meets the standard. The injection molding cooling time of the figurine toy is further calculated to obtain the injection molding cooling time of the figurine toy, thereby effectively ensuring the cooling efficiency and qualified rate of the figurine toy, so that the injection molding efficiency and quality of the figurine toy can meet the qualified standard.

Description

Technical Field

[0001] The invention relates to the technical field of toy injection molding, and in particular to an injection molding method and system for a figurine toy. Background Art

[0002] Doll toys are a common type of toy, usually referring to toys with cute and interesting shapes and appearances. There are many types of doll toys, ranging from simple plastic toys to complex collectibles, and their production processes are also varied.

[0003] Injection molding is a commonly used process in the manufacture of doll toys. Its principle is to put thermoplastic plastic particles into the injection molding machine, heat and melt them, inject them into the mold, and cool and solidify them to form the desired shape. The advantage of injection molding is that it can quickly and efficiently produce a large number of plastic products with complex shapes at a relatively low cost.

[0004] In the existing injection molding process, during the injection molding process of doll toys and during the cooling process of the doll toys, the cooling rate is different due to the different cooling water flow rates and temperatures. The cooling rate has a great influence on the surface stress of the molded doll toys, resulting in poor quality of some doll toys due to surface stress problems after the injection molding is completed. Therefore, ensuring the cooling water flow rate and temperature during the injection molding process and thus ensuring the cooling rate is an important part of the injection molding process. Therefore, we propose an injection molding method and system for doll toys. Summary of the invention

[0005] The object of the present invention is to provide a method and system for injection molding of a doll toy to solve the above-mentioned problems.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for injection molding a doll toy, comprising:

[0008] Step 1: Filling: First close the injection mold, then squeeze the high-temperature melted plastic raw material into the mold cavity and fill the mold cavity;

[0009] Step 2: Pressure holding: pressurize the mold cavity and hold the pressure;

[0010] Step 3: Cooling: Cooling the injection mold to cool and solidify the plastic product in the mold cavity; including:

[0011] S1: Obtain the residual stress value on the surface of the injection molded product, marked as ZPL;

[0012] S2: Compare the residual stress value ZPL on the surface of the injection molded product with the residual stress threshold ZPLy on the surface of the injection molded product;

[0013] If the residual stress value ZPL on the surface of the injection molded product is less than or equal to the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding qualified signal is generated;

[0014] If the residual stress value ZPL on the surface of the injection molded product is greater than the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding failure signal is generated;

[0015] S3: Based on the injection molding failure signal, the cooling water data in the cooling process and the mold temperature value in the mold cooling process are obtained, marked as MJ; the mold temperature change rate is first calculated and marked as MSL, and then the injection molding cooling stress model is calculated;

[0016] S4: Based on the injection cooling stress model, the cooling water data is adjusted to obtain an injection molded product with a qualified residual stress value on the surface of the injection molded product;

[0017] Step 4: Open the mold: Open the injection mold to eject the finished doll toy product.

[0018] As a further solution of the present invention: the cooling water data includes a cooling water flow value and a cooling water temperature value, which are marked as SLL and SWD respectively.

[0019] As a further solution of the present invention: the calculation method of the mold temperature change rate MSL is:

[0020] Obtain the initial temperature value Mcs and the final temperature value Mzz of the mold during the cooling process, and obtain the cooling time LQsc of the mold;

[0021] pass The mold temperature change rate MSL during the injection mold cooling process is calculated.

[0022] As a further solution of the present invention: the injection cooling stress model is obtained in the following manner:

[0023] V1: Obtain historical data during the cooling process of injection molds;

[0024] Including historical mold temperature change rate MSLs, historical cooling water flow value SLLs and historical cooling water temperature value SWDs; αβθγμ2

[0025] V2: Calculate the influence coefficients of cooling water flow and cooling water temperature on the mold temperature change rate, including flow influence coefficient α, temperature influence coefficient β and temperature change correction coefficient γ;

[0026] V3: Get the historical surface residual stress values ​​ZPLs of injection molded products;

[0027] V4: Calculate the residual stress influence coefficient θ and residual stress correction coefficient μ;

[0028] V5: Based on the flow influence coefficient α, temperature influence coefficient β, temperature change correction coefficient γ, residual stress influence coefficient θ and residual stress correction coefficient μ; the injection cooling model is obtained

[0029] As a further solution of the present invention: in V2, the historical mold temperature change rate MSLs, the historical cooling water flow value SLLs and the historical cooling water temperature value SWDs are simulated into The flow influence coefficient α, temperature influence coefficient β and temperature change correction coefficient γ are calculated.

[0030] As a further solution of the present invention: in V4, the historical injection molded product surface residual stress value ZPL and the historical mold temperature change rate MSLs are inserted into ZPLs=θ×MSLs+μ to calculate the residual stress influence coefficient θ and the residual stress correction coefficient μ.

[0031] As a further solution of the present invention: in S4, based on the injection molding cooling stress model, the cooling water flow value SLL and the cooling water temperature value SWD in the cooling process are adjusted so that the residual stress value ZPL on the surface of the injection molded product meets the qualified standard.

[0032] As a further solution of the present invention: in said S4, the adjusted cooling water flow adjustment value SLLx and cooling water temperature adjustment value SWDx are obtained;

[0033] pass Calculate and obtain the adjusted mold temperature change rate adjustment value MSLx;

[0034] pass The mold cooling time adjustment value LQscx after adjustment is calculated.

[0035] As a further solution of the present invention: in S4, the mold cooling time adjustment value LQscx is compared with the cooling time threshold value LQscy;

[0036] If the cooling time adjustment value LQscx of the mold is less than or equal to the cooling time threshold value LQscy, the surface residual stress of the injection molded product is adjusted to be qualified;

[0037] If the cooling time adjustment value LQscx of the mold is greater than the cooling time threshold LQscy, the residual stress adjustment on the surface of the injection molded product is unqualified; the system stops running and issues an alarm.

[0038] An injection molding system for a doll toy, comprising:

[0039] Filling module: The filling module is used to close the injection mold, squeeze the high-temperature melted plastic raw material into the mold cavity, and fill the mold cavity;

[0040] Pressure holding module: The pressure holding module is used to pressurize the mold cavity and maintain the pressure;

[0041] Cooling module: The cooling module is used to cool the injection mold to cool and solidify the plastic product in the mold cavity;

[0042] Mold opening module: The mold opening module is used to open the injection mold to eject the molded doll toy product.

[0043] Beneficial effects of the present invention:

[0044] (1) In the present invention, by fitting and calculating the historical mold temperature change rate, historical cooling water flow value, historical cooling water temperature value and historical injection molded product surface residual stress value, a formula for the influence of cooling water flow rate and cooling water temperature on the temperature change rate during mold cooling during the historical injection molding process can be obtained. Further, based on the surface residual stress value of the mold after injection molding and the mold temperature change, an injection molding cooling model can be obtained. When the surface residual stress of the molded toy does not meet the standard, the cooling water flow rate and cooling water temperature can be quickly adjusted to adjust the injection molding to obtain a molded toy with a surface residual stress value that meets the standard.

[0045] (2) In the present invention, by measuring and judging the surface residual stress value of the doll toy after injection molding, when the surface residual stress value of the doll toy does not meet the standard, the cooling water flow rate and the cooling water temperature can be quickly adjusted to adjust the injection molding to obtain a doll toy with a surface residual stress value that meets the standard; at the same time, after adjusting the cooling data so that the residual stress on the surface of the doll toy meets the standard, the injection molding cooling time of the doll toy is further calculated to obtain the injection molding cooling time of the doll toy, and based on the production efficiency of the doll toy, it is judged whether the adjusted cooling time meets the injection molding cooling time standard. If the cooling time still meets the requirement after adjusting the cooling data so that the surface residual stress of the doll toy meets the standard, the cooling efficiency and qualified rate of the doll toy can be effectively guaranteed, so that the injection molding efficiency and quality of the doll toy can meet the qualified standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] Figure 1 It is a schematic flow chart of the injection molding method of the present invention;

[0048] Figure 2 It is a system structure block diagram of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Embodiment 1

[0051] See also Figure 1 As shown, the present invention is an injection molding method for a doll toy, comprising:

[0052] Step 1: Filling: First close the injection mold, then squeeze the high-temperature melted plastic raw material into the mold cavity and fill the mold cavity;

[0053] Step 2: Pressure holding: pressurize the mold cavity and hold the pressure;

[0054] Step 3: Cooling: Cool the injection mold to cool and solidify the plastic product in the mold cavity;

[0055] Step 4: Open the mold: Open the injection mold to eject the finished doll toy product.

[0056] Embodiment 2

[0057] Based on the above embodiment, in this embodiment, data monitoring is performed on the cooling process of the injection mold;

[0058] include:

[0059] S1: Obtain the residual stress value on the surface of the injection molded product, marked as ZPL;

[0060] S2: Compare the residual stress value ZPL on the surface of the injection molded product with the residual stress threshold ZPLy on the surface of the injection molded product;

[0061] If the residual stress value ZPL on the surface of the injection molded product is less than or equal to the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding qualified signal is generated;

[0062] If the residual stress value ZPL on the surface of the injection molded product is greater than the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding failure signal is generated;

[0063] S3: based on the injection molding failure signal, the cooling water data in the cooling process and the mold temperature value in the mold cooling process are obtained, which are marked as MJ; wherein the cooling water data includes the cooling water flow value and the cooling water temperature value, which are marked as SLL and SWD respectively;

[0064] First, calculate the mold temperature change rate and mark it as MSL. The calculation method of the mold temperature change rate MSL is:

[0065] Obtain the initial temperature value Mcs and the final temperature value Mzz of the mold during the cooling process, and obtain the cooling time LQsc of the mold;

[0066] pass Calculate and obtain the mold temperature change rate MSL during the cooling process of the injection mold;

[0067] Then calculate and obtain the injection cooling stress model;

[0068] S4: Based on the injection cooling stress model, the cooling water data is adjusted to obtain an injection molded product with a qualified residual stress value on the surface of the injection molded product;

[0069] Specifically, the cooling water flow value SLL and the cooling water temperature value SWD during the cooling process are adjusted so that the residual stress value ZPL on the surface of the injection molded product meets the qualified standard;

[0070] Obtaining the adjusted cooling water flow adjustment value SLLx and cooling water temperature adjustment value SWDx;

[0071] pass Calculate and obtain the adjusted mold temperature change rate adjustment value MSLx;

[0072] pass Calculate and obtain the mold cooling time adjustment value LQscx after adjustment;

[0073] Compare the mold cooling time adjustment value LQscx with the cooling time threshold LQscy;

[0074] If the cooling time adjustment value LQscx of the mold is less than or equal to the cooling time threshold value LQscy, the surface residual stress of the injection molded product is adjusted to be qualified;

[0075] If the cooling time adjustment value LQscx of the mold is greater than the cooling time threshold LQscy, the residual stress adjustment on the surface of the injection molded product is unqualified; the system stops running and issues an alarm;

[0076] By measuring and judging the surface residual stress value of the injection-molded figurine toy, when the surface residual stress value of the figurine toy does not meet the standard, the cooling water flow and the cooling water temperature can be quickly adjusted to adjust the injection molding to obtain a figurine toy with a surface residual stress value that meets the standard; at the same time, after adjusting the cooling data so that the residual stress on the surface of the figurine toy meets the standard, the injection molding cooling time of the figurine toy is further calculated to obtain the cooling time of the injection molding of the figurine toy, and based on the production efficiency of the figurine toy, it is judged whether the adjusted cooling time meets the standard of the injection molding cooling time. If the cooling time still meets the requirements after adjusting the cooling data so that the surface residual stress of the figurine toy meets the standard, the cooling efficiency and the qualified rate of the figurine toy can be effectively guaranteed, so that the injection molding efficiency and quality of the figurine toy can meet the qualified standards.

[0077] Embodiment 3

[0078] Based on the above embodiment, this embodiment provides the following solution for obtaining the injection molding cooling stress model: including:

[0079] V1: Obtain historical data during the cooling process of injection molds;

[0080] Including historical mold temperature change rate MSLs, historical cooling water flow value SLLs and historical cooling water temperature value SWDs;

[0081] V2: The historical mold temperature change rate MSLs, historical cooling water flow value SLLs and historical cooling water temperature value SWDs are simulated into In the process, the influence coefficients of cooling water flow rate and cooling water temperature on the mold temperature change rate are calculated, including flow influence coefficient α, temperature influence coefficient β and temperature change correction coefficient γ;

[0082] V3: Get the historical surface residual stress values ​​ZPLs of injection molded products;

[0083] V4: The historical surface residual stress value ZPL of the injection molded product and the historical mold temperature change rate MSLs are inserted into ZPLs=θ×MSLs+μ to calculate the residual stress influence coefficient θ and the residual stress correction coefficient μ;

[0084] V5: Based on the flow influence coefficient α, temperature influence coefficient β, temperature change correction coefficient γ, residual stress influence coefficient θ and residual stress correction coefficient μ; the injection cooling model is obtained

[0085] By fitting and calculating the historical mold temperature change rate MSLs, the historical cooling water flow value SLLs, the historical cooling water temperature value SWDs and the historical injection molded product surface residual stress value ZPLs, we can obtain the influence formula of the cooling water flow rate and cooling water temperature on the temperature change rate in the mold cooling process during the historical injection molding process. Furthermore, based on the surface residual stress value of the injection molded doll mold and the mold temperature change, we can obtain the injection molding cooling model. When the surface residual stress of the injection molded doll toy does not meet the standard, the cooling water flow rate and cooling water temperature can be quickly adjusted to adjust the injection molding to obtain a doll toy with a surface residual stress value that meets the standard.

[0086] Embodiment 4

[0087] Reference Figure 2 As shown, an injection molding system for a doll toy includes:

[0088] Filling module: The filling module is used to close the injection mold, squeeze the high-temperature melted plastic raw material into the mold cavity, and fill the mold cavity;

[0089] Pressure holding module: The pressure holding module is used to pressurize the mold cavity and maintain the pressure;

[0090] Cooling module: The cooling module is used to cool the injection mold to cool and solidify the plastic product in the mold cavity;

[0091] Mold opening module: The mold opening module is used to open the injection mold to eject the molded doll toy product.

[0092] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for injection molding a doll toy, characterized in that: include: Step 1: Filling: First close the injection mold, then squeeze the high-temperature melted plastic raw material into the mold cavity and fill the mold cavity; Step 2: Pressure holding: pressurize the mold cavity and hold the pressure; Step 3: Cooling: Cooling the injection mold to cool and solidify the plastic product in the mold cavity; including: S1: Obtain the residual stress value on the surface of the injection molded product, marked as ZPL; S2: Compare the residual stress value ZPL on the surface of the injection molded product with the residual stress threshold ZPLy on the surface of the injection molded product; If the residual stress value ZPL on the surface of the injection molded product is less than or equal to the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding qualified signal is generated; If the residual stress value ZPL on the surface of the injection molded product is greater than the residual stress threshold ZPLy on the surface of the injection molded product, an injection molding failure signal is generated; S3: Based on the injection molding failure signal, the cooling water data in the cooling process and the mold temperature value in the mold cooling process are obtained, marked as MJ; the mold temperature change rate is first calculated and marked as MSL, and then the injection molding cooling stress model is calculated; S4: Based on the injection cooling stress model, the cooling water data is adjusted to obtain an injection molded product with a qualified residual stress value on the surface of the injection molded product; Step 4: Open the mold: open the injection mold to eject the finished doll toy product; The injection cooling stress model is obtained as follows: V1: Obtain historical data during the cooling process of injection molds; Including historical mold temperature change rate MSLs, historical cooling water flow value SLLs and historical cooling water temperature value SWDs; V2: Calculate the influence coefficients of cooling water flow and cooling water temperature on the mold temperature change rate, including flow influence coefficient α, temperature influence coefficient β and temperature change correction coefficient γ; V3: Get the historical surface residual stress values ​​ZPLs of injection molded products; V4: Calculate the residual stress influence coefficient θ and residual stress correction coefficient μ; V5: Based on the flow influence coefficient α, temperature influence coefficient β, temperature change correction coefficient γ, residual stress influence coefficient θ and residual stress correction coefficient μ; the injection cooling model is obtained In V2, the historical mold temperature change rate MSLs, the historical cooling water flow value SLLs and the historical cooling water temperature value SWDs are simulated into The flow influence coefficient α, temperature influence coefficient β and temperature change correction coefficient γ are calculated.

2. The method for injection molding a doll toy according to claim 1, characterized in that: The cooling water data includes a cooling water flow value and a cooling water temperature value, which are marked as SLL and SWD respectively.

3. The method for injection molding a doll toy according to claim 1, characterized in that: The calculation method of the mold temperature change rate MSL is: Obtain the initial temperature value Mcs and the final temperature value Mzz of the mold during the cooling process, and obtain the cooling time LQsc of the mold; pass The mold temperature change rate MSL during the injection mold cooling process is calculated.

4. The method for injection molding a figurine toy according to claim 3, characterized in that: In V4, the historical surface residual stress value ZPL of the injection molded product and the historical mold temperature change rate MSLs are inserted into ZPLs=θ×MSLs+μ to calculate the residual stress influence coefficient θ and the residual stress correction coefficient μ.

5. The method for injection molding a doll toy according to claim 1, characterized in that: In S4, based on the injection molding cooling stress model, the cooling water flow value SLL and the cooling water temperature value SWD in the cooling process are adjusted so that the residual stress value ZPL on the surface of the injection molding product meets the qualified standard.

6. The method for injection molding a figurine toy according to claim 5, characterized in that: In said S4, the adjusted cooling water flow adjustment value SLLx and cooling water temperature adjustment value SWDx are obtained; pass Calculate and obtain the adjusted mold temperature change rate adjustment value MSLx; pass The mold cooling time adjustment value LQscx after adjustment is calculated.

7. The method for injection molding a figurine toy according to claim 6, characterized in that: In the above S4, the mold cooling time adjustment value LQscx is compared with the cooling time threshold value LQscy; If the cooling time adjustment value LQscx of the mold is less than or equal to the cooling time threshold value LQscy, the surface residual stress of the injection molded product is adjusted to be qualified; If the cooling time adjustment value LQscx of the mold is greater than the cooling time threshold LQscy, the residual stress adjustment on the surface of the injection molded product is unqualified; the system stops running and issues an alarm.

8. An injection molding system for doll toys, the system implementing the method according to claim 1, characterized in that: include: Filling module: The filling module is used to close the injection mold, squeeze the high-temperature melted plastic raw material into the mold cavity, and fill the mold cavity; Pressure holding module: The pressure holding module is used to pressurize the mold cavity and maintain the pressure; Cooling module: The cooling module is used to cool the injection mold to cool and solidify the plastic product in the mold cavity; Mold opening module: The mold opening module is used to open the injection mold to eject the finished doll toy product.

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