CN111898265A - Method for determining injection molding process parameters of plastic product and method for establishing coefficient library thereof - Google Patents
Method for determining injection molding process parameters of plastic product and method for establishing coefficient library thereof Download PDFInfo
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- 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
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- 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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Abstract
The invention discloses a method for determining injection molding process parameters of plastic products and a method for establishing a coefficient library of the injection molding process parameters, 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 carrying out multiple times of numerical simulation analysis to obtain first theoretical injection molding process parameters of the various plastic products; performing multiple mold tests on various plastic products based on the adjustment value of the first theoretical injection molding process parameter of the various plastic products, and determining the actual injection molding process parameter of the various plastic products; determining the coefficients of the injection molding process parameters of the various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products; and forming a coefficient library of the 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 die testing resources can be reduced, the die testing time before mass production can be saved, the blindness can be reduced, the effective utilization rate of injection molding equipment can be improved, and the production quality of products can be controlled.
Description
Technical Field
The invention relates to the technical field of injection molding processes, in particular to a method for determining injection molding process parameters of a plastic product and a method for establishing a coefficient library of the plastic product.
Background
The main theoretical basis of the existing determination method of injection molding process parameters is a physical property table of plastic raw materials, and generally, a mold testing worker performs mold testing for many times according to process parameters in the physical property table of the materials to obtain the determined injection molding process parameters. However, the process parameters in the material property table are inconsistent with the recommended ranges of different materials, and the process range needs to be verified in a segmented manner for many times according to the recommended ranges in the material property table, so that related die testing resources are wasted, and the die testing period is long; and the influence of artificial factors in the process of testing the model is obvious, and the model testing personnel only need to carry out experience debugging or inexperienced probabilistic debugging, so that the method lacks theoretical scientific basis, and has high blindness and high product quality variability.
Disclosure of Invention
In view of this, in order to overcome the defects in the determination method of the injection molding process parameters in the prior art, embodiments of the present invention provide a determination method of injection molding process parameters of a plastic product 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 carrying out multiple times of numerical simulation analysis to obtain first theoretical injection molding process parameters of the various plastic products; performing multiple mold tests on various plastic products based on the adjustment value of the first theoretical injection molding process parameter of the various plastic products, and determining the actual injection molding process parameter of the various plastic products; determining the coefficients of the injection molding process parameters of the various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products; and forming a coefficient library of the injection molding process parameters according to the coefficients of the injection molding process parameters of various plastic products.
Optionally, the method for obtaining the first theoretical injection molding process parameter of the plastic product by establishing a three-dimensional model for the plastic product and performing multiple times of numerical simulation analysis includes: calculating the volume quantity 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 amount, the number of the cavities and the preset screw diameter of the injection molding equipment; performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure holding pressure and the preset first pressure holding 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 pressure maintaining pressure determined by the highest injection pressure of the first preset percentage, a second pressure maintaining time determined by the gate freezing time, the 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 and a second preset threshold, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, second pressure maintaining pressure, second pressure maintaining time, first mold 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 and a fourth preset threshold, 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 pressure maintaining pressure, the pressure maintaining time, the mold 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, pressure maintaining pressure, pressure maintaining time, mold temperature and material temperature; the method comprises the following steps of performing multiple mold tests on a plastic product based on an adjustment value of a first theoretical injection molding process parameter of the plastic product, and determining an actual injection molding process parameter of the plastic product, wherein the multiple mold tests comprise: preparing plastic products at different injection speeds; carrying out comparative analysis on the shape 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 pressure maintaining pressure, and preparing plastic products under different pressure maintaining pressures based on the optimal injection speed, the optimal mold temperature and the adjusted first theoretical pressure maintaining pressure; comparing and analyzing the shape parameters of the plastic product under different pressure maintaining pressures to determine the optimal pressure maintaining pressure; determining the optimal material temperature according to the range of the material temperature corresponding to the plastic product; adjusting the value of the first theoretical pressure maintaining time, and preparing plastic products under different pressure maintaining times based on the optimal injection speed, the optimal mold temperature, the optimal pressure maintaining pressure and the optimal material temperature; comparing and analyzing the weights of the plastic products under different pressure maintaining times to determine a third pressure maintaining time; determining the optimal pressure maintaining time according to the third pressure maintaining 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 pressure maintaining pressure, the optimal pressure maintaining time and the optimal material temperature.
Optionally, a difference between an upper limit and a 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 includes: 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 the optimal mold temperature is determined according to the range of the mold temperature corresponding to the plastic product, including: preparing plastic products with preset temperature gradients at different mold temperatures according to the range of the mold temperature corresponding to the plastic products; and comparing and analyzing the shape parameters of the plastic product at different mold temperatures to determine the optimal mold temperature.
Optionally, after comparing and analyzing the profile parameters of the plastic product at different injection speeds to determine an optimal injection speed, the method for establishing the coefficient library of the injection molding process parameters further includes: respectively injecting a short injection runner and a product according to the optimal injection speed; analyzing pressure distribution in the injection molding process according to the short jet flow channel and the product; flow during filling of the stream was verified based on the pressure profile.
Optionally, before performing multiple mold tests on various plastic products based on the adjustment value of the first theoretical injection molding process parameter of the various plastic products and determining the actual injection molding process parameter of the various plastic products, the method for establishing the coefficient library of the injection molding process parameter further includes: preparing various plastic products according to the 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 coefficients of the injection molding process parameters of the various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products includes: and determining the coefficient of the injection molding process parameters of the various plastic products according to the ratio of the actual injection molding process parameters of the various plastic products to the first theoretical injection molding process parameters.
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 simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter; selecting a corresponding coefficient of the injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, wherein the coefficient library of the injection molding process parameter is established by the establishing method of the coefficient library of the injection molding process parameter in the first aspect or any embodiment of the first aspect; 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.
Optionally, determining the injection molding process parameter of the plastic product to be processed according to the second theoretical injection molding process parameter and the coefficient of the injection molding process parameter, including: and determining the injection molding process parameters of the plastic product to be processed according to the product of the second theoretical injection molding process parameters and the coefficients of the injection molding process parameters.
According to a third aspect, an embodiment of the present invention provides an apparatus for determining injection molding process parameters of a plastic product, including: the acquisition module is used for acquiring a three-dimensional model and type information of a plastic product to be processed; the simulation module is used for carrying out simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter; a selecting module, configured to select a corresponding coefficient of the injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, where the coefficient library of the injection molding process parameter is established by a method for establishing the coefficient library of the injection molding process parameter as in the first aspect or any embodiment of the first aspect; 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.
According to a fourth aspect, an embodiment of the present invention provides a computer device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the processor, and the instructions are executed by the at least one processor to cause the at least one processor to execute the method for determining the injection molding process parameters of the plastic product according to 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, which stores computer instructions for causing a computer to execute the method for determining the injection molding process parameters of the plastic product according to 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 parameter is obtained by carrying out the mold flow analysis on the similar plastic products, the actual injection molding process parameter is obtained by verifying the actual mold testing process, and the coefficient of the injection molding process parameter of the similar plastic products is obtained by combining the first theoretical injection molding process parameter and the actual injection molding process parameter, so that the ratio between the actual injection molding process parameter and the theoretical injection molding process parameter of the similar plastic products can be obtained through a small number of mold testing processes, and 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 parameter obtained by simulating the other plastic products and the ratio without being obtained through the actual mold testing process, the waste of related mold testing resources can be reduced, the mold testing 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, products with controllable production quality are produced, and 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 used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a flow chart of a method of establishing a coefficient library of injection molding process parameters according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for determining injection molding process parameters of a plastic product according to an embodiment of the present invention;
FIG. 3 is a block diagram of an apparatus for determining injection molding process parameters of a plastic product according to an embodiment of the present invention;
fig. 4 shows a block diagram of a computer apparatus of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for establishing a coefficient library of injection molding process parameters, which comprises the following steps of:
s101, establishing a three-dimensional model for various plastic products and carrying out multiple times of numerical simulation analysis 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 types of plastic products are classified by the raw materials of the plastic products. The method comprises the steps of establishing a three-dimensional model for each type of different plastic products, setting different injection molding process parameter values for simulation analysis to obtain theoretical injection molding process parameters of each type of different plastic products, and integrating and analyzing the theoretical injection molding process parameters of each type of different plastic products to finally determine the optimal theoretical injection molding process parameter, namely the first theoretical injection molding process parameter, of each type of plastic product.
S102, performing multiple mold testing 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; specifically, the first theoretical injection molding process parameter value can be properly adjusted on the basis of the first theoretical injection molding process parameter obtained by analyzing the mold flow, and the actual injection molding process parameters of various plastic products can be obtained by performing mold testing according to the actual injection molding equipment and the adjusted first theoretical injection molding process parameter.
S103, determining coefficients of injection molding process parameters of various plastic products according to actual injection molding process parameters of the various plastic products and first theoretical injection molding process parameters; specifically, if the actual injection molding process parameter/the first theoretical injection molding process parameter is 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 is 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 the coefficients of the injection molding process parameters of various plastic products. Specifically, the coefficient sets of the injection molding process parameters of various plastic products are collected to form the 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 collected to form the 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 perform mold flow analysis on the similar plastic products to obtain the first theoretical injection molding process parameters, verify the actual injection molding process parameters through the actual mold testing process to obtain the actual injection molding process parameters, and combine the first theoretical injection molding process parameters and the actual injection molding process parameters to obtain the coefficients of the injection molding process parameters of the similar plastic products, 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 through a small number of mold testing processes, and therefore, 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 by simulating the other plastic products and the ratio, and the actual mold testing process is not needed, so that the waste of related mold testing resources can be reduced, the mould testing 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 production quality of products is controllable, and a scientific basis is provided for the injection molding process.
In an optional embodiment, the establishing a three-dimensional model of the plastic product and performing multiple times of numerical simulation analysis to obtain a first theoretical injection molding process parameter of the plastic product includes: calculating the volume quantity 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 amount, the number of the cavities and the preset screw diameter of the injection molding equipment; performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure holding pressure and the preset first pressure holding 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 pressure maintaining pressure determined by the highest injection pressure of the first preset percentage, a second pressure maintaining time determined by the gate freezing time, the 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 and a second preset threshold, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, second pressure maintaining pressure, second pressure maintaining time, first mold 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 and a fourth preset threshold, 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 pressure maintaining pressure, the pressure maintaining time, the mold 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.
Specifically, the preset first holding pressure and the first preset holding time may be determined according to the size and the wall thickness of the plastic product. The first preset percentage may be set to 80%. The first mold temperature and the first material temperature can be set according to the recommended mold temperature and the recommended material range of the plastic product, if the difference between the upper limit and the lower limit of the recommended mold temperature is not more than 20 ℃, the middle value of the recommended mold temperature can be set as the first mold temperature, and if the difference between the upper limit and the lower limit of the recommended material temperature is not more than 20 ℃, the middle value of the recommended material temperature can be set as the first material temperature. 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 in each segment as the first mold temperature for simulation analysis respectively. 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 in each segment as a first material temperature for simulation analysis respectively. And each time of simulation analysis can obtain filling time, flow front temperature, shearing rate, average volume shrinkage and product deformation trend, and a group of optimal theoretical injection molding process parameters can be obtained by comparing the filling time, the flow front temperature, the shearing 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.
The plastic product is subjected to mold flow analysis by changing various process parameters of the plastic product, so that a set of optimal first theoretical injection molding process parameters can be used, theoretical basis can be provided for a subsequent mold testing process, blindness of the mold testing process can be reduced, verification period and times of the mold testing process are shortened, cost is saved, and efficiency is improved.
In an alternative embodiment, the injection molding process parameters include: injection speed, pressure maintaining pressure, pressure maintaining time, mold temperature and material temperature; the method comprises the following steps of performing multiple mold tests on a plastic product based on an adjustment value of a first theoretical injection molding process parameter of the plastic product, and determining an actual injection molding process parameter of the plastic product, wherein the multiple mold tests comprise: preparing plastic products at different injection speeds; carrying out comparative analysis on the shape 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 pressure maintaining pressure, and preparing plastic products under different pressure maintaining pressures based on the optimal injection speed, the optimal mold temperature and the adjusted first theoretical pressure maintaining pressure; comparing and analyzing the shape parameters of the plastic product under different pressure maintaining pressures to determine the optimal pressure maintaining pressure; determining the optimal material temperature according to the range of the material temperature corresponding to the plastic product; adjusting the value of the first theoretical pressure maintaining time, and preparing plastic products under different pressure maintaining times based on the optimal injection speed, the optimal mold temperature, the optimal pressure maintaining pressure and the optimal material temperature; comparing and analyzing the weights of the plastic products under different pressure maintaining times to determine a third pressure maintaining time; determining the optimal pressure maintaining time according to the third pressure maintaining 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 pressure maintaining pressure, the optimal pressure maintaining time and the optimal material temperature.
Specifically, the shape parameters of the plastic product include appearance and size. When plastic products at different injection speeds are prepared, the injection speed of the injection molding equipment can be adjusted to be gradually reduced from the limit speed. According to the feedback condition of the pressure of the injection molding equipment under different speed states and the appearance of the product, the optimal injection speed and the corresponding optimal material flow filling speed can be determined. When the optimal pressure maintaining pressure is determined, the value of the first theoretical pressure maintaining pressure can be adjusted, the difference value can be increased or decreased gradually according to the set actual situation, the injection molding is carried out for a plurality of times, 3-mold products are injected each time, the appearance and the size of the products are analyzed on site, and the optimal pressure maintaining pressure is obtained. When the optimal pressure holding time is determined, the value of the first theoretical pressure holding time can be adjusted, 1s is added or 1s is subtracted, 3-mold products are injected respectively, the weight of the products is weighed to obtain a third pressure holding time, and a preset value is added on the basis of the third pressure holding time to obtain the optimal pressure holding time. The preset value may be 0.5 s.
The method has the advantages that the plastic product is subjected to mold testing for many times through the adjusting value based on the first theoretical injection molding process parameter of the plastic product, the number of times of mold testing can be reduced, the plastic product is subjected to mold testing through changing the first theoretical injection molding process parameter of the plastic product, a set of optimal actual injection molding process parameters can be obtained, and the actual injection molding process parameters can be provided for subsequent combination of the first theoretical injection molding process parameter and the actual injection molding process parameters.
In an alternative embodiment, 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, 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 analysis of the appearance and the size of the product.
In an alternative embodiment, the difference between the upper limit and the lower limit of the mold temperature corresponding to the plastic product is greater than 20 ℃, and the optimal mold temperature is determined according to the range of the mold temperature corresponding to the plastic product, which includes: preparing plastic products with preset temperature gradients at different mold temperatures according to the range of the mold temperature corresponding to the plastic products; and comparing and analyzing the shape parameters of the plastic product at different mold temperatures to determine the optimal mold temperature.
Specifically, the preset temperature gradient may be 10 ℃. The temperature of the recommended mold can be gradually increased by 10 ℃ according to the lower limit value of the recommended mold temperature to reach the upper limit value of the recommended mold temperature, 3-mold products are injected respectively, the appearance and the size of the products are analyzed on site, and the optimal mold temperature is obtained.
In an alternative embodiment, after comparing and analyzing the profile 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: respectively injecting a short injection runner and a product according to the optimal injection speed; analyzing pressure distribution in the injection molding process according to the short jet flow channel and the product; flow during filling of the stream was verified based on the pressure profile.
After the optimal injection speed is determined, the injection molding short jet flow channel and the pressure distribution in the injection molding process are analyzed by a product, the flowability in the material flow filling process is verified, the mold of the test mold can be tested, the mold is prevented from being tested continuously under the condition that the mold is not proper, and the inaccuracy of the obtained actual injection molding process parameters caused by the influence of the mold can be prevented.
In an optional embodiment, before performing multiple mold tests on various plastic products based on the adjustment value of the first theoretical injection molding process parameter of the various plastic products and determining the actual injection molding process parameter of the various plastic products, the method for establishing the coefficient library of the injection molding process parameter further includes: preparing various plastic products according to the 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, referring to each type of first theoretical injection molding process parameters, each type of plastic products can be subjected to injection molding by 3 molds, the appearance and the size of the products are analyzed on site, and the rationality of the first theoretical injection molding process is judged.
By verifying the rationality of various first theoretical injection molding process parameters before mold testing, mold testing under the condition that the first theoretical injection molding process parameters are unreasonable can be prevented, so that actual injection molding process parameters obtained by mold testing are unreasonable, and related mold testing resources are wasted.
In an alternative embodiment, determining the coefficients of the injection molding process parameters of the various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products includes: and determining the coefficient of the injection molding process parameters of the various plastic products according to the ratio of the actual injection molding process parameters of the various plastic products to the first theoretical injection molding process parameters.
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 when the injection molding process parameters of other similar plastic products are determined, the theoretical injection molding process parameters of the other plastic products are directly multiplied by the coefficient, the injection molding process parameters of the other plastic products can be obtained, and the calculation is simple.
The embodiment of the invention also provides a method for determining injection molding process parameters of a 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 simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter; specifically, the specific implementation of the simulation analysis may refer to the step of the simulation analysis in the method for establishing the coefficient library of the injection molding process parameters, and is not described herein again.
S203, selecting a corresponding coefficient of the injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, wherein the coefficient library of the injection molding process parameter is established by the establishing method of the coefficient library of the injection molding process parameter in any embodiment; specifically, the coefficients of the corresponding injection molding process parameters can be found according to the type information.
And S204, 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. 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 coefficient 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, obtains the first theoretical injection molding process parameters by performing mold flow analysis on the similar plastic products, obtains the actual injection molding process parameters by verifying the actual mold testing process, and combines the first theoretical injection molding process parameters and the actual injection molding process parameters to obtain the coefficients of the injection molding process parameters of the similar plastic products, 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 through a small number of mold testing processes, and thus when determining the injection molding process parameters of the similar other plastic products, 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 by simulating the other plastic products and the ratio, and the actual mold testing process is not needed, so that the waste of related mold testing resources can be reduced, the mould testing 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 production quality of products is controllable, and a scientific basis is provided for the injection molding process.
The embodiment of the present invention further provides a device for determining injection molding process parameters of a plastic product, as shown in fig. 3, including: the acquiring module 301 is configured to acquire a three-dimensional model and type information of a plastic product to be processed; the simulation module 302 is used for performing simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter; a selecting module 303, configured to select a corresponding coefficient of the injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, where the coefficient library of the injection molding process parameter is established by the establishing method of the coefficient library of the injection molding process parameter in any of the above embodiments; and the determining module 304 is configured to determine the injection molding process parameter of the plastic product to be processed according to the second theoretical injection molding process parameter and the coefficient of the injection molding process parameter.
The device for determining the injection molding process parameters of the plastic products, provided by the embodiment of the invention, obtains the first theoretical injection molding process parameters by carrying out mold flow analysis on the similar plastic products, obtains the actual injection molding process parameters by verifying the actual mold testing process, and combines the first theoretical injection molding process parameters and the actual injection molding process parameters to obtain the coefficients of the injection molding process parameters of the similar plastic products, 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 through a small number of mold testing processes, and therefore, 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 by simulating the other plastic products and the ratio, and the waste of related mold testing resources can be reduced without obtaining through the actual mold testing process, the mould testing 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 production quality of products is controllable, and a scientific basis is provided for the injection molding process.
An embodiment of the present invention further 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 other means, and fig. 4 illustrates the connection by the bus as an example.
The processor 31 may be a Central Processing Unit (CPU). The Processor 31 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 32 is a non-transitory computer readable storage medium, and can be used to store 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 a plastic product according to the embodiment of the present invention. The processor 31 executes the non-transitory software programs, instructions and modules stored in the memory 32 to execute various functional applications and data processing of the processor, that is, to implement the method for determining the injection molding process parameters of the plastic product in the above method embodiment.
The memory 32 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 31, and the like. Further, 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, the memory 32 may optionally include memory located remotely from the processor 31, and these remote memories may be connected to the 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 for determining the injection molding process parameters of the plastic product in the embodiment shown in fig. 2.
The details of the computer device can be understood by referring to the corresponding related description and effects in the embodiment shown in fig. 2, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (13)
1. A method for establishing a coefficient library of injection molding process parameters is characterized by comprising the following steps:
establishing a three-dimensional model for each type of plastic product and carrying out multiple times of numerical simulation analysis to obtain first theoretical injection molding process parameters of each type of plastic product;
performing multiple mold tests 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 the coefficients of the injection molding process parameters of the various plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of the various plastic products;
and forming a coefficient library of injection molding process parameters according to the coefficients of the injection molding process parameters of the various plastic products.
2. The method for establishing a coefficient library of injection molding process parameters according to claim 1, wherein establishing a three-dimensional model for a plastic product and performing a plurality of numerical simulation analyses to obtain a first theoretical injection molding process parameter of the plastic product comprises:
calculating the volume quantity 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 amount, the number of the cavities and the preset screw diameter of the injection molding equipment;
performing simulation analysis on the three-dimensional model based on the first injection speed, the preset first pressure holding pressure and the preset first pressure holding 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 pressure maintaining pressure determined by the highest injection pressure of a first preset percentage, a second pressure maintaining time determined by the gate freezing time, the 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 and a second preset threshold, and performing simulation analysis on the three-dimensional model based on the adjusted first injection speed, the adjusted second pressure maintaining pressure, the adjusted second pressure maintaining time, the adjusted first mold temperature and the adjusted 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 and a fourth preset threshold, and performing simulation analysis on the three-dimensional model based on the adjusted second pressure maintaining pressure, the adjusted first injection speed, the adjusted second pressure maintaining time, the adjusted first mold temperature and the adjusted first material temperature to obtain a fifth simulation analysis result and a sixth simulation analysis result;
and determining the first theoretical injection speed, the pressure-maintaining pressure, the pressure-maintaining time, the mold 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. A method of establishing a coefficient library of injection molding process parameters according to claim 1, wherein the injection molding process parameters comprise: injection speed, pressure maintaining pressure, pressure maintaining time, mold temperature and material temperature;
performing multiple mold tests 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, wherein the steps comprise:
preparing plastic products at different injection speeds;
carrying out comparative analysis on the shape parameters of the plastic product 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 a 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;
carrying out comparative analysis on the shape parameters of the plastic product under different pressure maintaining pressures to determine the optimal pressure maintaining pressure;
determining the optimal material temperature according to the range of the material temperature corresponding to the plastic product;
adjusting the value of a first theoretical pressure holding time, and preparing plastic products under different pressure holding times based on the optimal injection speed, the optimal mold temperature, the optimal pressure holding pressure and the optimal material temperature;
comparing and analyzing the weights of the plastic products under different pressure maintaining times to determine a third pressure maintaining time;
determining the optimal dwell time according to 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 pressure maintaining pressure, the optimal pressure maintaining time and the optimal material temperature.
4. A method for establishing a library of injection molding process parameters according to claim 3, wherein 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 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.
5. A method for establishing a library of injection molding process parameters according to claim 3, wherein the difference between the upper and lower limits of the mold temperature corresponding to the plastic product is greater than 20 ℃, and the determining the optimal mold temperature according to the range of the mold temperature corresponding to the plastic product comprises:
preparing plastic products with preset temperature gradients at different mold temperatures according to the range of the mold temperature corresponding to the plastic products;
and comparing and analyzing the shape parameters of the plastic product at different mold temperatures to determine the optimal mold temperature.
6. The method for creating a coefficient library of injection molding process parameters according to claim 3, wherein after the comparing and analyzing the profile parameters of the plastic product at different injection speeds to determine the optimal injection speed, the method further comprises:
respectively injecting a short injection runner and a product according to the optimal injection speed;
analyzing pressure distribution in the injection molding process according to the short jet flow channel and the product;
flow during filling of the stream is verified based on the pressure profile.
7. The method for establishing a coefficient library of injection molding process parameters according to claim 1, wherein before performing multiple mold tests on each type of plastic product based on the adjustment value of the first theoretical injection molding process parameter of each type of plastic product to determine the actual injection molding process parameter of each type of plastic product, the method further comprises:
preparing various plastic products according to the first theoretical injection molding process parameters of the various plastic products;
and verifying the rationality of the first theoretical injection molding process parameters of the various plastic products according to the appearance parameters of the various plastic products.
8. The method for establishing an injection molding process parameter coefficient library according to claim 1, wherein the determining the coefficients of the injection molding process parameters of each type of the plastic products according to the actual injection molding process parameters and the first theoretical injection molding process parameters of each type of the plastic products comprises:
and determining the coefficients of the injection molding process parameters of the various plastic products according to the ratio of the actual injection molding process parameters of the various plastic products to the first theoretical injection molding process parameters.
9. A method for determining injection molding process parameters of a plastic product is characterized by comprising the following steps:
acquiring a three-dimensional model and type information of a plastic product to be processed;
performing simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter;
selecting a corresponding coefficient of the injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, wherein the coefficient library of the injection molding process parameter is established by the establishing method of the coefficient library of the injection molding process parameter according to any one of claims 1 to 8;
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.
10. The method for determining the injection molding process parameters of a plastic product according to claim 9, wherein the determining the injection molding process parameters of the plastic product to be processed according to the second theoretical injection molding process parameter and the 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 second theoretical injection molding process parameters and the coefficients of the injection molding process parameters.
11. A device for determining injection molding process parameters of plastic products is characterized by comprising:
the acquisition module is used for acquiring a three-dimensional model and type information of a plastic product to be processed;
the simulation module is used for carrying out simulation analysis for multiple times according to the three-dimensional model to obtain a second theoretical injection molding process parameter;
a selecting module, configured to select a corresponding coefficient of an injection molding process parameter according to the type information and a preset coefficient library of the injection molding process parameter, where the coefficient library of the injection molding process parameter is established by the establishing method of the coefficient library of the injection molding process parameter according to any one of claims 1 to 8;
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.
12. 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 processor, and the instructions are executed by the at least one processor to cause the at least one processor to execute the method for determining the injection molding process parameters of the plastic product according to any one of claims 9 to 10.
13. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions for causing the computer to execute the method for determining the injection molding process parameters of the plastic product according to any one of claims 9-10.
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