CN111898265B - Method for determining injection molding process parameters of plastic products and method for establishing coefficient library of plastic products - Google Patents
Method for determining injection molding process parameters of plastic products and method for establishing coefficient library of plastic products Download PDFInfo
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 282
- 238000000034 method Methods 0.000 title claims abstract description 70
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- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- 238000005206 flow analysis Methods 0.000 description 6
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a method for determining injection molding process parameters of plastic products and a method for establishing a coefficient library thereof, wherein the method for establishing the coefficient library of the injection molding process parameters comprises the following steps: establishing a three-dimensional model for various plastic products and performing numerical simulation analysis for a plurality of times to obtain first theoretical injection molding process parameters of the various plastic products; performing multiple test on various plastic products based on the adjustment values of the first theoretical injection molding process parameters of the various plastic products, and determining the actual injection molding process parameters of the various plastic products; determining coefficients of injection molding process parameters of various plastic products according to actual injection molding process parameters and first theoretical injection molding process parameters of various plastic products; and forming a coefficient library of injection molding process parameters according to the coefficients of the injection molding process parameters of various plastic products. By implementing the invention, the waste of related mold testing resources can be reduced, the mold testing time before mass production is saved, the blindness is reduced, the effective utilization rate of injection molding equipment is improved, and the product with controllable quality is produced.
Description
Technical Field
The invention relates to the technical field of injection molding technology, in particular to a method for determining injection molding technology parameters of plastic products and a method for establishing a coefficient library thereof.
Background
The main theoretical basis of the existing injection molding process parameter determination method is a physical property table of plastic raw materials, and generally, a mold testing person performs multiple mold testing according to the process parameters in the physical property table of the materials, and then the determined injection molding process parameters are obtained. However, the technological parameters in the material physical property table are inconsistent with the recommended ranges of different materials, and the technological range is required to be verified in a segmented way for multiple times according to the recommended ranges in the material physical property table, so that related mold testing resources are wasted, and the mold testing period is long; in addition, the influence of artificial factors is obvious in the process of testing the mold, and the test personnel can test the mold by means of past experience or inexperienced probabilistic test, so that the test personnel lack of theoretical scientific basis, have larger blindness and have large product quality variability.
Disclosure of Invention
In view of the above, in order to overcome the defects in the determining method of injection molding process parameters in the prior art, the embodiment of the invention provides a determining method of injection molding process parameters of plastic products and a method for establishing a coefficient library thereof.
According to a first aspect, an embodiment of the present invention provides a method for establishing a coefficient library of injection molding process parameters, including: establishing a three-dimensional model for various plastic products and performing numerical simulation analysis for a plurality of times to obtain first theoretical injection molding process parameters of the various plastic products; performing multiple test on various plastic products based on the adjustment values of the first theoretical injection molding process parameters of the various plastic products, and determining the actual injection molding process parameters of the various plastic products; determining coefficients of injection molding process parameters of various plastic products according to actual injection molding process parameters and first theoretical injection molding process parameters of various plastic products; and forming a coefficient library of injection molding process parameters according to the coefficients of the injection molding process parameters of various plastic products.
Optionally, building a three-dimensional model for the plastic product and performing numerical simulation analysis for a plurality of times to obtain a first theoretical injection molding process parameter of the plastic product, including: calculating the volume quantity of the plastic product and the number of the cavities according to the three-dimensional model of the plastic product; determining a first injection speed during injection molding according to the volume, the number of cavities and the preset screw diameter of injection molding equipment; performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure maintaining pressure and the preset first pressure maintaining time to obtain the highest injection pressure and the gate freezing time during injection molding; performing simulation analysis on the three-dimensional model based on a second dwell pressure determined by the highest injection pressure of the first preset percentage, a second dwell time determined by the gate freezing time, a first injection speed, a preset first mold temperature and a preset first material temperature to obtain a second simulation result; respectively adjusting the first injection speed according to a first preset threshold value and a second preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, second dwell pressure, second dwell time, first die temperature and first material temperature to obtain a third simulation analysis result and a fourth simulation analysis result; respectively adjusting the second pressure maintaining pressure according to a third preset threshold value and a fourth preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted second pressure maintaining pressure, the first injection speed, the second pressure maintaining time, the first mold temperature and the first material temperature to obtain a fifth simulation analysis result and a sixth simulation analysis result; and determining the first theoretical injection speed, the dwell pressure, the dwell time, the die temperature and the material temperature of the plastic product according to the second simulation analysis result, the third simulation analysis result, the fourth simulation analysis result, the fifth simulation analysis result and the sixth simulation analysis result.
Optionally, the injection molding process parameters include: injection speed, dwell pressure, dwell time, mold temperature, material temperature; performing multiple test on the plastic product based on the adjustment value of the first theoretical injection molding process parameter of the plastic product to determine the actual injection molding process parameter of the plastic product, including: preparing plastic products at different injection speeds; comparing and analyzing appearance parameters of plastic products at different injection speeds to determine the optimal injection speed; determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product; adjusting the value of the first theoretical holding pressure, and preparing plastic products under different holding pressures based on the optimal injection speed, the optimal mold temperature and the adjusted first theoretical holding pressure; comparing and analyzing appearance parameters of the plastic products under different pressure maintaining pressures to determine the optimal pressure maintaining pressure; determining the optimal material temperature according to the material temperature range corresponding to the plastic product; adjusting the value of the first theoretical dwell time, and preparing plastic products under different dwell times based on the optimal injection speed, the optimal mold temperature, the optimal dwell pressure and the optimal material temperature; comparing and analyzing the weights of the plastic products under different dwell times to determine a third dwell time; determining an optimal dwell time from the third dwell time; and determining the actual injection molding process parameters of the plastic product according to the optimal injection speed, the optimal mold temperature, the optimal dwell pressure, the optimal dwell time and the optimal material temperature.
Optionally, the difference between the upper limit and the lower limit of the mold temperature corresponding to the plastic product is less than or equal to 20 ℃, and determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product comprises: and determining the optimal mold temperature according to the intermediate value of the mold temperature corresponding to the plastic product.
Optionally, the difference between the upper limit and the lower limit of the mold temperature corresponding to the plastic product is greater than 20 ℃, and determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product comprises: preparing plastic products at different mold temperatures with preset temperature gradients according to the ranges of the mold temperatures corresponding to the plastic products; and comparing and analyzing the appearance parameters of the plastic products at different mold temperatures to determine the optimal mold temperature.
Optionally, after comparing and analyzing the appearance parameters of the plastic product at different injection speeds and determining the optimal injection speed, the method for establishing the coefficient library of the injection molding process parameters further comprises the following steps: respectively injecting short injection channels and products according to the optimal injection speed; analyzing pressure distribution in the injection molding process according to the short injection runner and the product; flowability during stream filling was verified from the pressure profile.
Optionally, before the multiple test molds are performed on the various plastic products based on the adjustment values of the first theoretical injection molding process parameters of the various plastic products, the method for establishing the coefficient library of the injection molding process parameters further comprises: preparing various plastic products according to first theoretical injection molding process parameters of the various plastic products; and verifying the rationality of the first theoretical injection molding process parameters of various plastic products according to the appearance parameters of the various plastic products.
Optionally, determining the coefficient of the injection molding process parameter of each plastic product according to the actual injection molding process parameter and the first theoretical injection molding process parameter of each plastic product includes: and determining coefficients of injection molding process parameters of various plastic products according to the ratio of the actual injection molding process parameters to the first theoretical injection molding process parameters of various plastic products.
According to a second aspect, an embodiment of the present invention provides a method for determining injection molding process parameters of a plastic product, including: acquiring a three-dimensional model and type information of a plastic product to be processed; performing multiple simulation analysis according to the three-dimensional model to obtain second theoretical injection molding process parameters; selecting the coefficient of the corresponding injection molding process parameter according to the type information and a coefficient library of the preset injection molding process parameter, wherein the coefficient library of the injection molding process parameter is established by the establishment method of the coefficient library of the injection molding process parameter in the first aspect or any implementation mode of the first aspect; and determining the injection molding process parameters of the plastic product to be processed according to the coefficients of the second theoretical injection molding process parameters and the injection molding process parameters.
Optionally, determining the injection molding process parameters of the plastic product to be processed according to the second theoretical injection molding process parameters and coefficients of the injection molding process parameters includes: and determining the injection molding process parameters of the plastic product to be processed according to the product of the coefficients of the second theoretical injection molding process parameters and the injection molding process parameters.
According to a third aspect, an embodiment of the present invention provides a device for determining an injection molding process parameter of a plastic product, including: the acquisition module is used for acquiring the three-dimensional model and type information of the plastic product to be processed; the simulation module is used for carrying out multiple simulation analysis according to the three-dimensional model to obtain second theoretical injection molding process parameters; the selection module is used for selecting the corresponding coefficient of the injection molding process parameter according to the type information and a coefficient library of the preset injection molding process parameter, and the coefficient library of the injection molding process parameter is established by the establishment method of the coefficient library of the injection molding process parameter in the first aspect or any implementation mode of the first aspect; the determining module is used for determining the injection molding process parameters of the plastic product to be processed according to the second theoretical injection molding process parameters and coefficients of the injection molding process parameters.
According to a fourth aspect, an embodiment of the present invention provides a computer device comprising: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of determining a plastic product injection molding process parameter as in the second aspect or any embodiment of the second aspect.
According to a fifth aspect, an embodiment of the present invention provides a computer readable storage medium storing computer instructions for causing a computer to perform a method for determining parameters of an injection molding process of a plastic product as in the second aspect or any embodiment of the second aspect.
The method for determining the injection molding process parameters of the plastic products and the method for establishing the coefficient library thereof provided by the embodiment of the invention are that the first theoretical injection molding process parameters are obtained by carrying out the die flow analysis on the similar plastic products, then the actual injection molding process parameters are obtained by the verification of the actual die test process, and the coefficients of the injection molding process parameters of the similar plastic products are obtained by combining the first theoretical injection molding process parameters and the actual injection molding process parameters, so that the ratio between the actual injection molding process parameters and the theoretical injection molding process parameters of the similar plastic products can be obtained by a small amount of die test process, the injection molding process parameters of the similar other plastic products can be obtained according to the product of the theoretical injection molding process parameters obtained by the simulation of the other plastic products, the injection molding process parameters of the other plastic products are not obtained by the actual die test process, the waste of related die test resources can be reduced, the die test time before mass production is saved, the influence of human factors is reduced, the blindness is reduced, the effective utilization rate of injection molding equipment is improved, the product with controllable quality is produced, and a scientific basis is provided for the injection molding process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for creating a coefficient library of injection molding process parameters according to an embodiment of the present invention;
FIG. 2 is a flow chart showing a method for determining injection molding process parameters of a plastic product according to an embodiment of the present invention;
FIG. 3 shows a block diagram of a device for determining parameters of an injection molding process of a plastic product according to an embodiment of the invention;
fig. 4 shows a block diagram of a computer device according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention provides a method for establishing a coefficient library of injection molding process parameters, which is shown in fig. 1 and comprises the following steps:
s101, building a three-dimensional model for various plastic products and carrying out numerical simulation analysis for a plurality of times to obtain first theoretical injection molding process parameters of the various plastic products; specifically, the injection molding process parameters include: injection speed, dwell pressure, dwell time, mold temperature, material temperature, etc. The kinds of plastic products are classified by the raw materials of the plastic products. The three-dimensional model can be built for a plurality of different plastic products of each type respectively, the theoretical injection molding process parameters of the plurality of different plastic products of each type are obtained through setting different injection molding process parameter values for analog analysis, and the optimal theoretical injection molding process parameters of the plastic products of each type, namely the first theoretical injection molding process parameters, can be finally determined through integrating and analyzing the theoretical injection molding process parameters of the plurality of different plastic products of each type.
S102, performing multiple test on various plastic products based on adjustment values of first theoretical injection molding process parameters of the various plastic products, and determining actual injection molding process parameters of the various plastic products; specifically, on the basis of the first theoretical injection molding process parameters obtained by the die flow analysis, the values of the first theoretical injection molding process parameters can be properly adjusted, and the actual injection molding process parameters of various plastic products can be obtained by performing die testing according to the actual injection molding equipment and the adjusted first theoretical injection molding process parameters.
S103, determining coefficients of injection molding process parameters of various plastic products according to actual injection molding process parameters and first theoretical injection molding process parameters of various plastic products; specifically, if the actual injection molding process parameter/the first theoretical injection molding process parameter=a, a is a coefficient of the injection molding process parameter of the plastic product, for example, the actual holding pressure/the first theoretical holding pressure=a1, A1 is a coefficient of the holding pressure of the plastic product.
S104, forming a coefficient library of injection molding process parameters according to coefficients of the injection molding process parameters of various plastic products. Specifically, the coefficients of the injection molding process parameters of various plastic products are integrated to form coefficient sets of the injection molding process parameters of various plastic products, and the coefficient sets of the injection molding process parameters of various plastic products are integrated to form a coefficient library of the injection molding process parameters.
The method for establishing the coefficient library of the injection molding process parameters provided by the embodiment of the invention is to obtain the first theoretical injection molding process parameters by carrying out the die flow analysis on the similar plastic products, then to obtain the actual injection molding process parameters by the verification of the actual die test process, and to combine the first theoretical injection molding process parameters with the actual injection molding process parameters to obtain the coefficients of the injection molding process parameters of the similar plastic products, thereby obtaining the ratio between the actual injection molding process parameters and the theoretical injection molding process parameters of the similar plastic products through a small amount of die test process, obtaining the injection molding process parameters of the similar plastic products according to the product of the theoretical injection molding process parameters obtained by the simulation of the other plastic products and the ratio without obtaining the injection molding process parameters through the actual die test process, reducing the waste of related die test resources, saving the die test time before mass production, reducing the influence of human factors, reducing blindness, improving the effective utilization rate of injection equipment, producing products with controllable quality, and providing scientific basis for the injection molding process.
In an alternative embodiment, a three-dimensional model is built for a plastic product and a plurality of numerical simulation analyses are performed to obtain a first theoretical injection molding process parameter of the plastic product, including: calculating the volume quantity of the plastic product and the number of the cavities according to the three-dimensional model of the plastic product; determining a first injection speed during injection molding according to the volume, the number of cavities and the preset screw diameter of injection molding equipment; performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure maintaining pressure and the preset first pressure maintaining time to obtain the highest injection pressure and the gate freezing time during injection molding; performing simulation analysis on the three-dimensional model based on a second dwell pressure determined by the highest injection pressure of the first preset percentage, a second dwell time determined by the gate freezing time, a first injection speed, a preset first mold temperature and a preset first material temperature to obtain a second simulation result; respectively adjusting the first injection speed according to a first preset threshold value and a second preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, second dwell pressure, second dwell time, first die temperature and first material temperature to obtain a third simulation analysis result and a fourth simulation analysis result; respectively adjusting the second pressure maintaining pressure according to a third preset threshold value and a fourth preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted second pressure maintaining pressure, the first injection speed, the second pressure maintaining time, the first mold temperature and the first material temperature to obtain a fifth simulation analysis result and a sixth simulation analysis result; and determining the first theoretical injection speed, the dwell pressure, the dwell time, the die temperature and the material temperature of the plastic product according to the second simulation analysis result, the third simulation analysis result, the fourth simulation analysis result, the fifth simulation analysis result and the sixth simulation analysis result.
In particular, the preset first holding pressure and the first preset dwell time may be determined according to the size and wall thickness of the plastic product. The first preset percentage may be set to 80%. The first mold temperature and the first material temperature may be set according to the recommended mold temperature and the range of the material temperature of the plastic product, the intermediate value of the recommended mold temperature may be set to the first mold temperature if the difference between the upper and lower limits of the recommended mold temperature does not exceed 20 ℃, and the intermediate value of the recommended material temperature may be set to the first material temperature if the difference between the upper and lower limits of the recommended material temperature does not exceed 20 ℃. If the difference between the upper limit and the lower limit of the recommended mold temperature exceeds 20 ℃, the mold temperature needs to be segmented, and a proper mold temperature needs to be selected from each segment as a first mold temperature for simulation analysis. If the difference between the upper limit and the lower limit of the recommended material temperature exceeds 20 ℃, the material temperature needs to be segmented, and a proper material temperature needs to be selected as a first material temperature in each segment for analog analysis. The filling time, the flow front temperature, the shear rate, the average volume shrinkage and the product deformation trend can be obtained in each simulation analysis, and the optimal theoretical injection molding process parameters can be obtained by comparing the filling time, the flow front temperature, the shear rate, the average volume shrinkage and the product deformation trend in the second simulation analysis result, the third simulation analysis result, the fourth simulation analysis result, the fifth simulation analysis result and the sixth simulation analysis result.
By changing the technological parameters of the plastic product to carry out the molding flow analysis on the plastic product, a group of optimal first theoretical injection molding technological parameters can be provided, theoretical basis can be provided for the subsequent mold testing process, the blindness of the mold testing process can be reduced, the verification period and times of the mold testing process can be shortened, the cost can be saved, and the efficiency can be improved.
In an alternative embodiment, the injection molding process parameters include: injection speed, dwell pressure, dwell time, mold temperature, material temperature; performing multiple test on the plastic product based on the adjustment value of the first theoretical injection molding process parameter of the plastic product to determine the actual injection molding process parameter of the plastic product, including: preparing plastic products at different injection speeds; comparing and analyzing appearance parameters of plastic products at different injection speeds to determine the optimal injection speed; determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product; adjusting the value of the first theoretical holding pressure, and preparing plastic products under different holding pressures based on the optimal injection speed, the optimal mold temperature and the adjusted first theoretical holding pressure; comparing and analyzing appearance parameters of the plastic products under different pressure maintaining pressures to determine the optimal pressure maintaining pressure; determining the optimal material temperature according to the material temperature range corresponding to the plastic product; adjusting the value of the first theoretical dwell time, and preparing plastic products under different dwell times based on the optimal injection speed, the optimal mold temperature, the optimal dwell pressure and the optimal material temperature; comparing and analyzing the weights of the plastic products under different dwell times to determine a third dwell time; determining an optimal dwell time from the third dwell time; and determining the actual injection molding process parameters of the plastic product according to the optimal injection speed, the optimal mold temperature, the optimal dwell pressure, the optimal dwell time and the optimal material temperature.
In particular, the appearance parameters of the plastic product include appearance and size. When the plastic products with different injection speeds are prepared, the injection speed of the injection molding equipment can be adjusted to be gradually decreased from the limit speed. According to the feedback condition of the injection molding equipment pressure and the appearance of the product under different speed states, the optimal injection speed and the corresponding optimal material flow filling speed can be determined. When the optimal pressure is determined, the value of the first theoretical pressure can be adjusted, the injection can be performed for a plurality of times according to the set increment or decrement difference value of actual conditions, 3 mould products are injected each time, and the appearance and the size of the products are analyzed on site to obtain the optimal pressure. When the optimal dwell time is determined, the value of the first theoretical dwell time can be adjusted, 1s is added or 1s is subtracted, 3-mould products are respectively injected, the weight of the products is weighed, the third dwell time is obtained, and a preset value is added on the basis of the third dwell time to obtain the optimal dwell time. The preset value may be 0.5s.
The plastic product is subjected to multiple mold testing based on the adjustment value of the first theoretical injection molding process parameter of the plastic product, so that the frequency of mold testing can be reduced, and the plastic product is subjected to mold testing by changing the first theoretical injection molding process parameter of the plastic product, so that a group of optimal actual injection molding process parameters can be obtained, and the actual injection molding process parameters can be provided for the subsequent combination of the first theoretical injection molding process parameter and the actual injection molding process parameter.
In an alternative embodiment, the difference between the upper and lower limits of the mold temperature corresponding to the plastic product is less than or equal to 20 ℃, and the optimal mold temperature is determined according to the range of the mold temperature corresponding to the plastic product, including: and determining the optimal mold temperature according to the intermediate value of the mold temperature corresponding to the plastic product.
Specifically, when the optimal mold temperature is determined according to the intermediate value of the mold temperature corresponding to the plastic product, the 3-mold product can be actually injection molded, and the rationality of the optimal mold temperature is verified through the appearance and size analysis of the product.
In an alternative embodiment, the difference between the upper and lower limits of the mold temperature corresponding to the plastic product is greater than 20 ℃, and determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product includes: preparing plastic products at different mold temperatures with preset temperature gradients according to the ranges of the mold temperatures corresponding to the plastic products; and comparing and analyzing the appearance parameters of the plastic products at different mold temperatures to determine the optimal mold temperature.
Specifically, the preset temperature gradient may be 10 ℃. The temperature of the mold can be increased by 10 ℃ according to the lower limit value of the recommended mold temperature, the temperature reaches the upper limit value of the recommended mold temperature, 3 mold products are respectively molded, and the appearance and the size of the products are analyzed on site to obtain the optimal mold temperature.
In an alternative embodiment, after comparing and analyzing the appearance parameters of the plastic product at different injection speeds to determine the optimal injection speed, the method for establishing the coefficient library of the injection molding process parameters further includes: respectively injecting short injection channels and products according to the optimal injection speed; analyzing pressure distribution in the injection molding process according to the short injection runner and the product; flowability during stream filling was verified from the pressure profile.
After the optimal injection speed is determined, the injection short jet channel and the pressure distribution in the product analysis injection process are used for verifying the flowability in the material flow filling process, so that the mold of the test mold can be verified, the continuous test of the mold under the condition that the mold is unsuitable is prevented, and the inaccuracy of the obtained actual injection technological parameters due to the influence of the mold can be prevented.
In an alternative embodiment, before the multiple test molds are performed on the various plastic products based on the adjustment values of the first theoretical injection molding process parameters of the various plastic products, the method for establishing the coefficient library of the injection molding process parameters further comprises: preparing various plastic products according to first theoretical injection molding process parameters of the various plastic products; and verifying the rationality of the first theoretical injection molding process parameters of various plastic products according to the appearance parameters of the various plastic products.
Specifically, with reference to each type of first theoretical injection molding process parameters, each type of plastic products can be molded into 3 molds, and the appearance and the size of the products are analyzed on site to judge the rationality of the first theoretical injection molding process.
By verifying the rationality of various first theoretical injection molding process parameters before the mold test, the mold test can be prevented under the condition that the first theoretical injection molding process parameters are unreasonable, so that the actual injection molding process parameters obtained by the mold test are unreasonable, and related mold test resources are wasted.
In an alternative embodiment, determining coefficients of injection molding process parameters of various plastic products according to actual injection molding process parameters and first theoretical injection molding process parameters of various plastic products includes: and determining coefficients of injection molding process parameters of various plastic products according to the ratio of the actual injection molding process parameters to the first theoretical injection molding process parameters of various plastic products.
The ratio of the actual injection molding process parameter to the first theoretical injection molding process parameter is determined as the coefficient of the injection molding process parameter of the plastic product, so that the theoretical injection molding process parameter of other plastic products is directly multiplied by the coefficient when the injection molding process parameters of other plastic products of the same kind are determined, and the injection molding process parameters of other plastic products can be obtained, and the calculation is simple.
The embodiment of the invention also provides a method for determining the injection molding process parameters of the plastic product, as shown in fig. 2, comprising the following steps:
s201, acquiring a three-dimensional model and type information of a plastic product to be processed; specifically, the type information is determined according to the material of the plastic product to be processed.
S202, performing multiple simulation analysis according to the three-dimensional model to obtain second theoretical injection molding process parameters; specifically, the specific implementation of the simulation analysis may refer to the steps of the simulation analysis in the method for establishing the coefficient library of the injection molding process parameters, which are not described herein.
S203, selecting corresponding coefficients of injection molding process parameters according to type information and a coefficient library of preset injection molding process parameters, wherein the coefficient library of the injection molding process parameters is established by the establishment method of the coefficient library of the injection molding process parameters in any embodiment; specifically, the coefficients of the corresponding injection molding process parameters can be found according to the type information.
S204, determining injection molding process parameters of the plastic product to be processed according to coefficients of the second theoretical injection molding process parameters and the injection molding process parameters. Specifically, the injection molding process parameters of the plastic product to be processed can be determined according to the product of the second theoretical injection molding process parameters and the coefficients of the injection molding process parameters.
The method for determining the injection molding process parameters of the plastic products provided by the embodiment of the invention is that the first theoretical injection molding process parameters are obtained by carrying out the die flow analysis on the similar plastic products, then the actual injection molding process parameters are obtained by the verification of the actual die test process, and the coefficients of the injection molding process parameters of the similar plastic products are obtained by combining the first theoretical injection molding process parameters and the actual injection molding process parameters, so that the ratio between the actual injection molding process parameters and the theoretical injection molding process parameters of the similar plastic products can be obtained by the small amount of die test process, and the injection molding process parameters of the similar plastic products can be obtained according to the product of the theoretical injection molding process parameters obtained by the simulation of the other plastic products and the ratio without the actual die test process, thereby reducing the waste of related die test resources, saving the die test time before mass production, reducing the influence of human factors, improving the effective utilization rate of injection molding equipment, producing products with controllable quality, and providing scientific basis for the injection molding process.
The embodiment of the invention also provides a device for determining the injection molding process parameters of the plastic product, as shown in fig. 3, comprising: the obtaining module 301 is configured to obtain three-dimensional model and type information of a plastic product to be processed; the simulation module 302 is configured to perform multiple simulation analysis according to the three-dimensional model, so as to obtain a second theoretical injection molding process parameter; the selecting module 303 is configured to select a coefficient of a corresponding injection molding process parameter according to the type information and a coefficient library of a preset injection molding process parameter, where the coefficient library of the injection molding process parameter is established by an establishing method of the coefficient library of the injection molding process parameter in any embodiment; the determining module 304 is configured to determine an injection molding process parameter of the plastic product to be processed according to the second theoretical injection molding process parameter and a coefficient of the injection molding process parameter.
The determining device for the injection molding process parameters of the plastic products provided by the embodiment of the invention obtains the first theoretical injection molding process parameters through carrying out the die flow analysis on the similar plastic products, then verifies the actual injection molding process parameters through the actual die test process to obtain the actual injection molding process parameters, combines the first theoretical injection molding process parameters with the actual injection molding process parameters to obtain the coefficients of the injection molding process parameters of the similar plastic products, and can obtain the ratio between the actual injection molding process parameters and the theoretical injection molding process parameters of the similar plastic products through a small amount of die test processes, so that when the injection molding process parameters of the similar other plastic products are determined, the injection molding process parameters of the other plastic products can be obtained according to the product of the theoretical injection molding process parameters obtained through the simulation of the other plastic products and the ratio, without obtaining the injection molding process parameters through the actual die test process, the waste of related die test resources can be reduced, the die test time before mass production is saved, the influence of human factors is reduced, the blindness is reduced, the effective utilization rate of injection molding equipment is improved, the product with controllable production quality is produced, and a scientific basis is provided for the injection molding process.
The embodiment of the invention also provides a computer device, as shown in fig. 4, including: a processor 31 and a memory 32, wherein the processor 31 and the memory 32 may be connected by a bus or otherwise, for example by a bus connection in fig. 4.
The processor 31 may be a central processing unit (Central Processing Unit, CPU). The processor 31 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory 32 is used as a non-transitory computer readable storage medium for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the method for determining injection molding process parameters of plastic products in the embodiments of the present invention. The processor 31 executes the non-transitory software programs, instructions and modules stored in the memory 32 to perform various functional applications and data processing of the processor, i.e., to implement the method for determining parameters of the injection molding process of plastic products in the above-described method embodiments.
The memory 32 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created by the processor 31, etc. In addition, the memory 32 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 32 may optionally include memory located remotely from processor 31, which may be connected to processor 31 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more of the modules described above are stored in the memory 32 and when executed by the processor 31 perform the method of determining parameters of a plastic product injection molding process in the embodiment shown in fig. 2.
The details of the above computer device may be understood correspondingly with respect to the relevant descriptions and effects corresponding to the embodiment shown in fig. 2, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (10)
1. The method for establishing the coefficient library of the injection molding process parameters is characterized by comprising the following steps of:
establishing a three-dimensional model for various plastic products and performing numerical simulation analysis for a plurality of times to obtain first theoretical injection molding process parameters of various plastic products, wherein the types of the plastic products are classified by raw materials of the plastic products;
performing multiple test on each type of plastic products based on the adjustment value of the first theoretical injection molding process parameter of each type of plastic products to determine the actual injection molding process parameter of each type of plastic products;
determining coefficients of injection molding process parameters of various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products, wherein the coefficients of the injection molding process parameters of the plastic products are ratios of the actual injection molding process parameters to the first theoretical injection molding process parameters;
the injection molding process parameters include: injection speed, dwell pressure, dwell time, mold temperature, material temperature; performing multiple mold testing on the plastic product based on the adjustment value of the first theoretical injection molding process parameter of the plastic product, and determining the actual injection molding process parameter of the plastic product comprises the following steps:
preparing plastic products at different injection speeds; comparing and analyzing appearance parameters of the plastic products at different injection speeds to determine the optimal injection speed; determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product; adjusting the value of the first theoretical holding pressure, and preparing plastic products under different holding pressures based on the optimal injection speed, the optimal mold temperature and the adjusted first theoretical holding pressure; comparing and analyzing the appearance parameters of the plastic products under different pressure maintaining pressures to determine the optimal pressure maintaining pressure; determining the optimal material temperature according to the material temperature range corresponding to the plastic product; adjusting the value of the first theoretical dwell time, and preparing plastic products under different dwell times based on the optimal injection speed, the optimal mold temperature, the optimal dwell pressure and the optimal material temperature; comparing and analyzing the weight of the plastic product under different dwell times to determine a third dwell time; determining an optimal dwell time from the third dwell time; determining actual injection molding process parameters of the plastic product according to the optimal injection speed, the optimal mold temperature, the optimal dwell pressure, the optimal dwell time and the optimal material temperature;
the difference between the upper limit and the lower limit of the mold temperature corresponding to the plastic product is less than or equal to 20 ℃, and the optimal mold temperature is determined according to the range of the mold temperature corresponding to the plastic product, and the method comprises the following steps: determining the optimal mold temperature according to the intermediate value of the mold temperature corresponding to the plastic product;
the difference between the upper limit and the lower limit of the mold temperature corresponding to the plastic product is more than 20 ℃, and the optimal mold temperature is determined according to the range of the mold temperature corresponding to the plastic product, comprising the following steps: preparing plastic products at different mold temperatures with preset temperature gradients according to the ranges of the mold temperatures corresponding to the plastic products; comparing and analyzing appearance parameters of the plastic products at different mold temperatures to determine the optimal mold temperature;
and forming a coefficient library of injection molding process parameters according to the coefficients of the injection molding process parameters of the plastic products.
2. The method for creating the coefficient library of the injection molding process parameters according to claim 1, wherein the creating a three-dimensional model of the plastic product and performing a plurality of numerical simulation analyses to obtain the first theoretical injection molding process parameters of the plastic product comprises:
calculating the volume and the number of cavities of the plastic product according to the three-dimensional model of the plastic product;
determining a first injection speed during injection molding according to the volume, the number of cavities and the screw diameter of preset injection molding equipment;
performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure maintaining pressure and the preset first pressure maintaining time to obtain the highest injection pressure and the gate freezing time during injection molding;
the first injection speed, the preset first mold temperature and the first material temperature are subjected to simulation analysis to the three-dimensional model, and a second simulation result is obtained;
respectively adjusting the first injection speed according to a first preset threshold value and a second preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, the second dwell pressure, the second dwell time, the first die temperature and the first material temperature to obtain a third simulation analysis result and a fourth simulation analysis result;
respectively adjusting the second holding pressure according to a third preset threshold value and a fourth preset threshold value, and performing simulation analysis on the three-dimensional model based on the adjusted second holding pressure, the first injection speed, the second holding time, the first mold temperature and the first material temperature to obtain a fifth simulation analysis result and a sixth simulation analysis result;
and determining the first theoretical injection speed, the dwell pressure, the dwell time, the die temperature and the material temperature of the plastic product according to the second simulation analysis result, the third simulation analysis result, the fourth simulation analysis result, the fifth simulation analysis result and the sixth simulation analysis result.
3. The method for creating a coefficient library of injection molding process parameters according to claim 1, wherein after said comparing the profile parameters of said plastic product at different injection speeds, determining an optimal injection speed, further comprising:
respectively injecting short injection channels and products according to the optimal injection speed;
analyzing pressure distribution in the injection molding process according to the short injection channel and the product;
and verifying the flowability of the stream during filling according to the pressure distribution.
4. The method of claim 1, wherein, before the performing multiple test on each of the plastic products based on the adjustment value of the first theoretical injection molding process parameter of each of the plastic products, determining the actual injection molding process parameter of each of the plastic products, further comprises:
preparing various plastic products according to the first theoretical injection molding process parameters of the plastic products;
verifying the rationality of the first theoretical injection molding process parameters of the plastic products according to the appearance parameters of the plastic products.
5. The method according to claim 1, wherein determining coefficients of injection molding process parameters of the plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the plastic products comprises:
and determining coefficients of injection molding process parameters of various plastic products according to the ratio of the actual injection molding process parameters to the first theoretical injection molding process parameters of the various plastic products.
6. The method for determining the injection molding process parameters of the plastic product is characterized by comprising the following steps of:
acquiring a three-dimensional model and type information of a plastic product to be processed;
performing multiple simulation analysis according to the three-dimensional model to obtain second theoretical injection molding process parameters;
selecting the coefficient of the corresponding injection molding process parameter according to the type information and a coefficient library of the preset injection molding process parameter, wherein the coefficient library of the injection molding process parameter is established by the establishment method of the coefficient library of the injection molding process parameter according to any one of claims 1-5;
and determining the injection molding process parameters of the plastic product to be processed according to the second theoretical injection molding process parameters and the coefficients of the injection molding process parameters.
7. The method of claim 6, wherein determining the injection molding process parameters of the plastic product to be processed based on the second theoretical injection molding process parameters and coefficients of the injection molding process parameters comprises:
and determining the injection molding process parameters of the plastic product to be processed according to the product of the coefficients of the second theoretical injection molding process parameters and the injection molding process parameters.
8. The device for determining the injection molding process parameters of the plastic product is characterized by comprising the following components:
the acquisition module is used for acquiring the three-dimensional model and type information of the plastic product to be processed;
the simulation module is used for carrying out multiple simulation analysis according to the three-dimensional model to obtain second theoretical injection molding process parameters;
a selecting module, configured to select coefficients of corresponding injection molding process parameters according to the type information and a coefficient library of preset injection molding process parameters, where the coefficient library of injection molding process parameters is established by the establishing method of the coefficient library of injection molding process parameters according to any one of claims 1-5;
and the determining module is used for determining the injection molding process parameters of the plastic product to be processed according to the second theoretical injection molding process parameters and the coefficients of the injection molding process parameters.
9. A computer device, comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the method of determining the injection molding process parameters of the plastic product of any of claims 6-7.
10. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of determining the injection molding process parameters of a plastic product according to any one of claims 6-7.
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| CN112330233B (en) * | 2021-01-05 | 2021-06-01 | 广州中和互联网技术有限公司 | Injection molding product quality detection method based on data model |
| CN114074397A (en) * | 2021-11-17 | 2022-02-22 | 无锡隆盛科技股份有限公司 | High-pressure injection molding process of HFI nozzle |
| CN114379043B (en) * | 2021-12-29 | 2024-06-04 | 江苏博云塑业股份有限公司 | Turbine die flow analysis method, turbine injection molding method and turbine |
| CN114311573B (en) * | 2021-12-30 | 2024-06-04 | 江苏博云塑业股份有限公司 | Model-based injection molding performance improvement method, device and computer storage medium |
| CN114986833B (en) * | 2022-06-06 | 2023-03-31 | 健大电业制品（昆山）有限公司 | Dynamically regulated injection molding method, system, device and medium |
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