CN114734562A - Systematic optimization design method for plastic part structure diagram - Google Patents
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a systematic optimization design method based on a plastic part structure diagram, which comprises the following steps of 1, running Moldflow to complete an analysis report of the plastic part; 2. evaluating a plastic part warping deformation parameter; 3. carrying out design optimization of a scheme aiming at the local warping part of the plastic part in three-dimensional software; 4. checking the maximum deformation warpage value of the plastic part, and customizing the tolerance size precision grade of the plastic part: high or general precision; step 5, comparing the optimal scheme of the fit clearance of the plastic part in the assembly drawing part, the maximum warping value of the plastic model scheme in an analysis report and the size tolerance selection grade of the plastic part in GB/T14486-2008; 6. and obtaining a structural design drawing of the optimal plastic part, an analysis report of the optimal plastic part, an optimal plastic runner system and an optimal plastic mold structure drawing. The invention can solve the problem of abnormal quality of plastic parts quickly, efficiently and systematically.
Description
Technical Field
The invention belongs to the field of industrial automation, and particularly relates to a systematic optimization design method for a plastic part structure diagram.
Background
Human Machine Interaction (HMI for short). A human-machine interface (also called user interface or user interface) is a medium for interaction and information exchange between a system and a user, and it enables conversion between an internal form of information and a human-acceptable form. Human-computer interfaces exist in all fields participating in human-computer information exchange. With the development of industrial automation, new products are continuously released from embedded, vertical and boom-type communication equipment to be applied to the field of automation. The quality of the whole machine is determined by the quality of the plastic rear cover of the key plastic part main control module and other key parts.
The plastic rear cover of the plastic part main control module can analyze and prejudge adverse factors of all stages of the whole machine assembly link in the part structure design stage, and systematically optimize and design the plastic part structure design drawing so as to meet the technical requirements of the plastic part size tolerance and the plastic part assembly drawing. The quality abnormality of the plastic part includes: shrinkage, material flow, flow lines, local buckling deformation of parts, welding marks and other defects cause abnormal quality factors of the plastic parts: whether the structural design of the plastic part is reasonable or not, whether the structural design drawing of the plastic part is analyzed through the special plastic mold flow analysis soft Moldflow or not and aiming at the detail problem of the structural design drawing of the plastic part, the technical requirements of the assembly of the parts of the dimensional tolerance and the assembly drawing of the plastic part are met. Meanwhile, the structure of the rear-end plastic mold needs to be designed, if the structural design of the rear-end plastic mold is not ideal, the whole system link is unfavorable, the quality defect of a new product at the front end can be caused, the development period is too long, the research and development input risk is increased, and if the structural design of the plastic mold is not ideal, uncertain factors such as repeated mold breaking, mold testing and plastic mold scrapping even under severe conditions can be caused at the rear end. Therefore, the systematic optimization design method of the plastic part structure diagram is a 'treasure' method for mastering the structural design of the front plastic part and the design success of the rear plastic mould by a structural design engineer.
Patent No. CN108549764A discloses a method for optimizing the structure of an automobile instrument based on the Moldflow analysis, but it has the following disadvantages:
1. the Moldflow does not provide the optimal pouring points of the plastic parts, does not provide the number of the optimal pouring points, does not provide the details related to the structure of the mold, and only provides the mold engineers and the mold adjusting engineers expected to be sent to the rear end, so that the quality of the plastic parts, particularly the quality of the complex plastic parts, cannot be ensured;
2. the control of the whole quality of the plastic part in the research and development of the mold structure and the product is limited, and even a rear-end plastic mold runner system structure, a plastic mold structure design scheme, the optimal pouring points of the plastic mold and the optimal pouring point number of the plastic mold are not mentioned;
3. the core technology part of the Moldflow simulation analysis software, namely the optimal pouring point and the optimal gate number of the plastic mold, is not mentioned, and not only relates to the mold structure, the mold structure simplicity degree, but also relates to the mold cost, and the quality of the Moldflow plastic part simulation analysis optimal accuracy report, and even when the Moldflow plastic part simulation analysis report of the invention is connected with a rear-end mold engineer, a mold structure designer can be misled, so that the defect hidden danger exists in the mold structure design.
The invention of the patent CN108549764A has essential technical defects and cannot solve substantial problems: i.e. how to avoid and reduce the defects of the plastic parts. If the rear end mold engineer refers to the data of the Moldflow analysis report of the plastic part, the hidden trouble is even brought to the mold structure design, and even the plastic part structure diagram in the invention patent is not the optimal structure design scheme.
Disclosure of Invention
The invention aims to provide a systematic optimization design method of a plastic part structure diagram, which aims to solve the technical problems of high cost, low production efficiency and abnormal quality of plastic parts of upstream research and development innovative enterprises and downstream manufacturing enterprises caused by the fact that the conventional upstream research and development innovative enterprise product structure design engineers, downstream manufacturing enterprise mold maintenance engineers and mold test engineers design, manufacture and produce plastic parts by experience and lack of a systematic integrated control method.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
a systematic optimization design method based on a plastic part structure diagram is characterized by comprising the following steps:
and 6, carrying out structural design on the plastic mold according to the optimal structural design drawing scheme of the plastic part and the optimal gate of the Moldflow of the optimal structural design drawing scheme of the plastic part, and obtaining the mold structural design drawing of the optimal plastic part.
Further, the step 1 specifically includes the following steps:
step 1.1, establishing a first scheme of a three-dimensional structure design drawing of the plastic part through three-dimensional software;
step 1.2, importing the established three-dimensional structure design drawing scheme I of the plastic part into Moldflow software for diagnosis;
step 1.3, repairing the first scheme of the three-dimensional structure design drawing of the plastic part according to the diagnosis result obtained in the step 1.2, and exporting a Moldflow studio file when the error information of the main menu is displayed as 0;
step 1.4, importing the Moldflow studio file exported in the step 1.3 into newly-built Moldflow software, and automatically establishing a plastic part simulation system by the Moldflow software;
step 1.5: creating a grid in the plastic part simulation system in the step 1.4 to obtain a generated grid window;
step 1.6: setting a global side length parameter in the generated grid window, customizing grid matching and calculating the thickness of the double-layer grid, and immediately dividing the grid;
step 1.7: after the grid division is finished, carrying out double-layer grid statistics, and carrying out grid restoration according to the grid division result;
step 1.8: clicking repeatedly in a system engineering task, clicking a newly generated task system, clicking filling, setting an analysis sequence, and selecting a pouring gate position; the system automatically generates a pouring gate position;
step 1.9: performing process setting, performing double-click process setting to enter gate position setting, selecting a gate area positioner, and clicking a high-grade option to complete process setting;
step 1.10: clicking to start analysis to generate an optimal sprue position result;
step 1.11: clicking repeatedly to generate a new system item based on the generated optimal sprue position item; selecting a newly generated item, selecting a gate position, and setting an analysis number: filling, pressure maintaining and warping;
step 1.12: arranging plastic materials to complete the material arrangement of the plastic parts;
step 1.13: performing process setting, performing double-click process setting to enter gate position setting, selecting a gate area positioner, and clicking a high-grade option to complete the process setting;
step 1.14: the system automatically judges whether the settings are correct or not; if the setting is abnormal, adjusting the setting parameters; if the setting is normal, starting analysis;
step 1.15: after the analysis is completed, focusing on the mold locking force parameter in the abnormal quality result of the plastic part;
step 1.16: selecting GB/T14486-2008 high-precision MT2a as 1.1, b as 1.2, and a as a dimensional tolerance value which is not influenced by a movable part of the mold according to the maximum length size of the plastic part of 439 mm; b is the dimensional tolerance value affected by the movable part of the mold; and judging whether the warping parameters in the Moldflow analysis report of the plastic part are consistent with the precision of the custom tolerance level.
Further, the value of the global side length array in the step 1.6 is set to be 60% of the average thickness of the plastic part.
Further, step 2, comparing the warping deformation in the plastic part simulation result with the high precision of GB/T14486-2008 to obtain a plastic part size tolerance parameter range, namely obtaining a plastic part warping value parameter range; and if the warping deformation is slightly large, performing model optimization on the plastic part by using SOLidworks software to obtain a second scheme of the three-dimensional structure design drawing of the plastic part.
Further, step 6, the mold structure diagram of the plastic part is distributed by UG software, and the mold structure diagram comprises a plastic mold exhaust system, a plastic mold waterway system and a plastic mold sprue runner system, so that an optimal plastic mold structure diagram of the two-plate mold cold runner is obtained.
The systematic optimization design method of the plastic part structure diagram has the following advantages that:
1. the invention provides a quick, efficient and systematic solution for plastic part quality defects in the overall planning of upstream innovative enterprises and downstream die industries. And sequentially deducing an optimal plastic part structure diagram, an optimal Moldflow mold flow analysis report of the optimal plastic part, an optimal runner system of the plastic part and an optimal plastic mold structure diagram, wherein the plastic part structure design diagram scheme (1 side gate) warpage value: 2.354mm, optimizing and improving the warpage value of the plastic part structural design drawing scheme (1 side gate): 0.9986 mm; the warping rate is reduced by about 135%; the cost of the mold structure of the optimal two-plate mold cold runner is reduced by about 50 percent compared with that of a mold with a hot runner; the cost of the plastic part shaping jig after the plastic part is molded and demoulded is reduced. Meanwhile, the plastic part quality risks from the upstream structural design stage to the plastic part mold manufacturing, processing and part production links are avoided, the mold structural design risks are avoided, the plastic part structural design risks are avoided, the plastic mold maintenance risks are avoided, and the repeated mold testing risks of plastic mold debugging and mold testing engineers are avoided.
2. The method for rapidly, efficiently and systematically solving the quality abnormity problem of the plastic part is recommended to be guided by an upstream innovative enterprise structure engineer, and changes the application and cooperation modes of the current upstream innovative enterprise and a downstream mold design, manufacture and generation enterprise; a technical communication bridge is set up for an upstream research and development enterprise product structure engineer, a downstream manufacturing enterprise mold design engineer, a downstream manufacturing enterprise mold maintenance engineer and a downstream manufacturing enterprise mold test engineer. The method establishes a new beneficial, efficient and virtuous-circle communication and cooperation system for the enterprises creating innovation and creativity of upstream and downstream and breaks the technical barriers.
3. The invention reduces the technical thresholds of analyzing and solving the quality problem of the plastic parts by an upstream innovative enterprise plastic structure engineer, a downstream manufacturing enterprise mold design engineer, a downstream manufacturing enterprise mold maintenance engineer and a downstream manufacturing enterprise mold test engineer, because of the characteristics of the invention: the quick, efficient and systematic assistance not only solves the problem of plastic quality defects, but also reduces the design cost, communication cost and management cost of plastic parts.
4. The invention realizes that the plastic part meets the high-precision grade corresponding to GB/T14468-2008, thereby meeting the requirements of the appearance, the warping size tolerance, the whole machine assembly of the plastic part and the function of the plastic part based on the whole machine. Avoid plastic part design risk, plastic mould structural design risk, plastic mould dimension guarantor risk, plastic part quality abnormal risk. The auxiliary force is provided for solving the technical problem of 'neck clamping' in the manufacturing industry, infinite possibility is created for promoting national 'intelligent manufacturing 2025', and meanwhile, the product quality and the enterprise competitiveness are improved.
Drawings
FIG. 1 is a schematic diagram of a vertical, boom, embedded human-machine interface assembly structure of the present invention;
FIG. 2 is a schematic structural diagram of a universal main control module, a human-machine interface main control module soft rubber sleeve and a human-machine interface boom of a vertical, boom-type and embedded human-machine interface final assembly of the present invention;
FIG. 3 is a Moldflow simulation analysis report of an optimal gate location in a plastic mold for a plastic part structural design of the present invention;
FIG. 4 is a schematic illustration of plastic warpage in a Moldflow simulation analysis report of an optimal gate location in a plastic mold according to the plastic part structural design of the present invention;
FIG. 5 is a schematic diagram of a Moldflow simulation analysis showing the plastic weld line in a report of an optimal gate location in a plastic mold according to the present invention;
FIG. 6 is a schematic illustration of plastic sink estimation in Moldflow simulation analysis report of an optimal gate location in a plastic mold according to the plastic part design of the present invention;
FIG. 7 is a schematic illustration of warpage in a Moldflow simulation analysis report of two optimal gate locations in a plastic mold according to a second embodiment of the present invention;
FIG. 8 is a Moldflow simulation analysis report of an optimal gate location in a plastic mold according to a second embodiment of the present invention;
FIG. 9 is a schematic illustration of warpage in a Moldflow simulation analysis report of an optimal gate location in a plastic mold for a plastic part structural design embodiment of the present invention;
FIG. 10 is a Moldflow simulation analysis report of an optimal gate location in a plastic mold for a third embodiment of the present invention;
FIG. 11 is a schematic illustration of a Moldflow simulation analysis report for warpage in a plastic mold for a third embodiment of the present invention;
FIG. 12 is a schematic view of a Moldflow simulation analysis report indicating sink mark estimation for an optimal gate position in a plastic mold according to a third embodiment of the present invention;
FIG. 13 is a schematic view of a Moldflow simulation analysis report weld line at an optimal gate location in a plastic mold according to a third embodiment of the present invention;
FIG. 14 is a schematic diagram of a plastic part structural design plan according to the present invention showing dimensions before optimization;
FIG. 15 is a schematic view of the plastic part before structural design drawing scheme of the present invention is optimized;
FIG. 16 is a schematic diagram of the plastic part according to the present invention after optimization of the design drawing;
FIG. 17 is a schematic view of the plastic part according to the present invention after the structural design drawing scheme is optimized;
FIG. 18 is a schematic diagram of a system control method for the stage from structural design to injection molding of a plastic part according to the present invention;
FIG. 19 is a schematic diagram of a system control method for the stage from structural design to injection molding of a plastic part according to the present invention;
FIG. 20 is a schematic view of a two-plate mold cold runner system and gates for designing a mold according to a fourth embodiment of the present invention;
FIG. 21 is a fixed mold (front mold) of a two-plate mold cold runner system for mold design according to the fourth embodiment of the present invention;
FIG. 22 is a moving mold (back mold) of a two-plate mold cold runner system for mold design according to the fourth embodiment of the present invention;
FIG. 23 is a schematic diagram of mold clamping force of a fixed mold (front mold) and a movable mold (rear mold) of a two-plate mold cold runner system for mold design according to the present invention in a Moldflow simulation report;
the notation in the figure is: 1. boom man-machine interface system equipment; 2. a man-machine interface main control module aluminum alloy panel; 3. a support plate in the human-computer interface main control module; 4. a plastic rear cover of the human-computer interface main control module; 5. a human-computer interface main control module soft rubber sleeve; 6. human-computer interface davit.
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the following describes a method for systematic optimization design of a plastic part structure diagram according to the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, the vertical, boom and embedded human-machine interface operation interface system is composed of a human-machine interface main control module of a general assembly and other components, the human-machine interface main control module and a human-machine interface boom 6 are combined into a boom human-machine interface system 1, wherein the human-machine interface main control module is a general component.
As shown in fig. 2, the human-computer interface main control module is composed of a human-computer interface main control module aluminum alloy panel 2, a human-computer interface main control module inner support plate 3, a human-computer interface main control module plastic rear cover 4 and a human-computer interface main control module soft rubber sleeve 5.
As shown in fig. 18 and 19, the present invention includes the steps of:
The method specifically comprises the following steps:
step 1.1, establishing a first three-dimensional structure design drawing scheme of the plastic part through three-dimensional software, as shown in fig. 3, setting the number of gates to be 1 in the first three-dimensional structure design drawing scheme of the plastic part of the plastic rear cover 4 of the human-computer interface main control module in Moldflow software, and analyzing the position of the 1 optimal gate in the mold structure of the plastic part.
Step 1.2, importing the established three-dimensional structure design drawing scheme I of the plastic part into Moldflow software for diagnosis;
step 1.3, repairing the first scheme of the three-dimensional structure design drawing of the plastic part according to the diagnosis result obtained in the step 1.2, and exporting a Moldflow studio file when the error information of the main menu is displayed as 0;
step 1.4, importing the Moldflow Study file exported in the step 1.3 into newly-built Moldflow software, and automatically establishing a plastic part simulation system by the Moldflow software;
step 1.5: creating a grid in the plastic part simulation system in the step 1.4 to obtain a generated grid window;
step 1.6: setting a global side length parameter in the generated grid window, customizing grid matching and calculating the thickness of the double-layer grid, and immediately dividing the grid;
step 1.7: after the grid division is finished, carrying out double-layer grid statistics, and judging whether grid restoration is needed according to the grid division result;
step 1.8: clicking repeatedly in the system engineering task, clicking a newly generated task system, clicking to fill, setting an analysis sequence, and selecting a pouring gate position; the system automatically generates a pouring gate position;
step 1.9: performing process setting, performing double-click process setting to enter gate position setting, selecting a gate area positioner, and clicking a high-grade option to complete process setting;
step 1.10: clicking to start analysis, and generating an optimal sprue position result;
step 1.11: clicking repeatedly to generate a new system item based on the generated optimal sprue position item; selecting a newly generated item, selecting a gate position, and setting an analysis number: filling, pressure maintaining and warping;
step 1.12: setting the material of the plastic part to complete the material setting;
step 1.13: carrying out process setting, carrying out double-click process setting to enter gate position setting, selecting a gate area positioner, clicking a high-grade option, and customizing a related option to carry out parameter setting to finish process setting;
step 1.14: the system automatically judges whether the settings are correct or not; if the setting is abnormal, adjusting the setting parameters; if the setting is normal, starting analysis;
step 1.15: after the analysis is completed, the mold locking force parameter is focused in the abnormal quality result of the plastic part, as shown in fig. 23, and the parameter is suitable for the tonnage of a machine for injection molding of the downstream plastic part at the connection selection position;
step 1.16: selecting GB/T14486-2008 high-precision MT2a as 1.1, b as 1.2, and a as a dimensional tolerance value which is not influenced by a movable part of the mold according to the maximum length size of the plastic part of 439 mm; b is the dimensional tolerance value affected by the movable part of the mold; and judging whether the warping parameters in the Moldflow analysis report of the plastic part are consistent with the precision of the user-defined level.
And 3, if the local warping parameter of the plastic part is large, carrying out design optimization of a third scheme in the three-dimensional software aiming at the local warping part of the plastic part, analyzing the improved three-dimensional structure design drawing scheme of the plastic part by the method in the step 1, and paying attention to the warping deformation value of the plastic part.
and 6, carrying out plastic mold structure design according to the optimal plastic part structure design drawing scheme and the optimal gate of Moldflow of the optimal plastic part structure design drawing scheme to obtain the optimal plastic part mold structure design drawing.
As shown in fig. 3, a plastic part structure diagram scheme of the HMI master control module plastic rear cover 4 is that a model is set with 1 gate in the Moldflow software, 1 optimal gate position in the plastic part mold structure is analyzed, the welding line of the HMI master control module plastic rear cover 4 is analyzed, and the welding line is found to affect the appearance of the plastic part, as shown in fig. 5. As shown in fig. 3, a plastic part structure diagram scheme of the HMI main control module plastic rear cover 4 is that a model is set with 1 gate in the Moldflow software, 1 optimal gate position in the plastic part mold structure is analyzed, and a parameter of the maximum value of the indentation estimation of the HMI main control module plastic rear cover 4 is analyzed: 0.0524mm, as shown in FIG. 6;
as shown in fig. 4, a first scheme of the three-dimensional structure design of the plastic rear cover 4 of the human-computer interface main control module is implemented in Moldflow software by establishing an optimal gate position and setting plastic materials: ABS, manufacturer: chi mei Corporation, brand No.: polylac PA-746H, clicking to determine the setting of the finished material; finishing the simulation analysis result of the injection position setting, the process setting and the three-dimensional structure design drawing scheme I of the plastic part, and mainly cutting the warping deformation parameters of the plastic part: the local maximum deformation dimension is 2.354 mm. Inquiring the ABS material of the part, wherein the shrinkage rate is 0.5 percent, and selecting high-precision MT2 according to the shrinkage characteristics of GB/T14486-; then the maximum size 438.4mm of the plastic part corresponds to the size tolerance table of the molding part, and the size tolerance table of the plastic part is searched to obtain the value a and the value b corresponding to the high-precision MT 2; a is the dimensional tolerance value not affected by the movable part of the mold, and b is the dimensional tolerance value affected by the movable part of the mold. Deriving a high-precision tolerance size range of the maximum size of the plastic part of 438.4 mm: 1.1mm to 1.2mm, it is obvious that the simulated maximum warpage deformation value of the first three-dimensional structure design drawing scheme of the plastic part is 2.354mm as shown in fig. 4, and therefore it is determined that the first three-dimensional structure design drawing scheme of the plastic part is unqualified and needs to be optimized, and the second three-dimensional structure design drawing scheme of the optimized plastic part is as shown in fig. 6.
As shown in fig. 7, a plastic part is optimized by using Solidworks software based on a Moldflow warping deformation part, that is, 2 optimal gate positions are calculated by using a plastic part structure diagram scheme and Moldflow, a Moldflow process parameter is set, and a plastic part maximum warping deformation parameter is inquired after analysis is completed: 2.055mm, and the ABS of the part is inquired in the figures 15 and 16, the shrinkage rate is 0.5%, and the high-precision MT2 is selected according to the shrinkage characteristic of GB/T14486-2008 plastic material and the dimensional tolerance grade of the common material molding; then the maximum size 438.4mm of the plastic part corresponds to that in FIG. 14, the numerical value a and the numerical value b corresponding to the high-precision MT2 are found by searching a plastic part size tolerance table; a is the dimensional tolerance value not affected by the movable part of the mold, and b is the dimensional tolerance value affected by the movable part of the mold. Deriving a high-precision tolerance size range of the maximum size of the plastic part of 438.4 mm: 1.1mm to 1.2mm, obviously, the simulated warpage value of the first plastic part structure diagram scheme is 2.354mm, as shown in fig. 4, the simulated warpage value of the second plastic part structure diagram scheme is 1.398mm, so it is determined that the first and second plastic part structure diagrams are unqualified and need to be optimized, and the optimized third plastic part structure diagram scheme is as shown in fig. 10. Comparing two different plastic mold structures with 1 gate and 2 gates set in fig. 3 to 7, the trend of the plastic part structure design and the plastic part mold structure is evaluated based on the Moldflow analysis result, which is helpful for the plastic part structure engineer to improve the plastic part structure diagram scheme three as shown in fig. 10.
As shown in fig. 9, the plastic part is optimized by using a warping deformation part of a first three-dimensional structure design drawing scheme of the plastic part analyzed by solid works software based on Moldflow, that is, 1 optimal gate position is calculated by using a second three-dimensional structure design drawing scheme of the plastic part and Moldflow, and according to the first three-dimensional structure design drawing scheme of the plastic part of the plastic rear cover 4 of the human-computer interface main control module shown in fig. 4, in the Moldflow software, by establishing the optimal gate position and setting a plastic material: ABS, manufacturer: chi mei Corporation, brand No.: polylac PA-746H, clicking to determine the setting of the finished material; finishing the setting of the injection position, the process setting and the setting of the simulation analysis result content of the three-dimensional structure design drawing scheme II of the plastic part, and inquiring the maximum warping deformation parameter value of the plastic part after the analysis is finished: 1.398 mm. Inquiring the ABS of the part material according to GB/T14486 plus 2008, wherein the shrinkage rate is 0.5 percent, and selecting high-precision MT2 according to the shrinkage characteristic of GB/T14486 plus 2008 plastic material and the dimensional tolerance grade of a common material molding part; then the maximum size 438.4mm of the plastic part corresponds to the size tolerance table of the molding part, and the size tolerance table of the plastic part is searched to obtain a numerical value a and a numerical value b corresponding to the high-precision MT 2; a is the dimensional tolerance value not affected by the movable part of the mold, and b is the dimensional tolerance value affected by the movable part of the mold. Deriving a high-precision tolerance size range of the maximum size of the plastic part of 438.4 mm: 1.1mm to 1.2mm, obviously, the simulated warpage value of the first three-dimensional structure design drawing scheme of the plastic part is 1.398mm, as shown in fig. 4, so that the second three-dimensional structure design drawing scheme of the plastic part is judged to be unqualified and needs to be optimized, and the third three-dimensional structure design drawing scheme of the optimized plastic part is judged.
As shown in fig. 10, a three-dimensional design drawing scheme of a plastic part optimized by using solid works software is shown, and a gate position area optimal for 1 gate state is calculated by using Moldflow.
As shown in fig. 11, according to the third scheme of the plastic part structure diagram optimized by using Solidworks software, the maximum warpage deformation of the third scheme of the structural design diagram of the HMI main control module plastic rear cover 4 in a 1-gate state is calculated to be 0.9986mm by using Moldflow. Inquiring ABS of a part material in GB/T14486-2008, wherein the shrinkage rate is 0.5%, and selecting high-precision MT2 according to the shrinkage characteristic of GB/T14486-2008 plastic materials and the dimensional tolerance grade of common material molding parts; then the maximum size 438.4mm of the plastic part corresponds to FIG. 14, and the numerical value a and the numerical value b corresponding to the high-precision MT2 are obtained by searching a plastic part size tolerance table; a is the dimensional tolerance value not affected by the movable part of the mold, and b is the dimensional tolerance value affected by the movable part of the mold. Deriving a high-precision tolerance size range of the maximum size of the plastic part of 438.4 mm: 1.1mm to 1.2mm, obviously the simulated warpage value of the third scheme of the plastic part structure diagram is 0.9986mm, as shown in fig. 10, therefore, the structural design diagram of the third scheme of the plastic part structure diagram is determined to be qualified, and a trend determination direction is provided for the structural optimization design of the plastic part and the structural design of the plastic part mold.
As shown in fig. 12, plastic part structure diagram scheme three as shown in fig. 10, 1 optimal gate position is set in the Moldflow software to obtain the maximum parameter for estimating sink mark: 0.0388mm, relating to the appearance of the plastic part molded part in the plastic mould molding scheme shown in the third scheme of figure 10.
As shown in fig. 13, the third plastic part structure plan is that 1 optimal gate position is set in the Moldflow software of fig. 10 to obtain the weld line: the third scheme relates to the appearance of the plastic part molded by the plastic mold shown in the figure 10.
Based on plastic part dimension tolerance table GB/T14486 and 2008, the scheme of the plastic part structure diagram of the rear cover 4 of the main control module of the optimal plastic structure part HMI is related to based on Moldflow.
As shown in FIG. 15, the plastic part structure of the HMI main control module rear cover 4 is shown as a first assembly.
As shown in fig. 16, a plastic part structure diagram scheme of the HMI main control module rear cover 4 is as shown in fig. 19, a warpage deformation amount of the third plastic model structure diagram in Moldflow is 0.9986mm, and meanwhile, the main control module soft rubber sleeve 5 is made of a soft rubber part, and it is only required to define that an assembling interference amount of the two parts of the HMI main control module rear cover 4 and the main control module soft rubber sleeve 5 is about 0.2mm, so that an assembling gap between the two parts of the HMI main control module rear cover 4 and the main control module soft rubber sleeve 5 can be defined to be 0.8mm, that is, the plastic part structure diagram scheme is an optimal plastic part structure diagram.
As shown in fig. 17, a fourth scheme of the optimal structural model diagram of the rear cover 4 of the HMI main control module is shown in fig. 16, namely, the warpage deformation of the rear cover 4 of the HMI main control module influences the improvement of the total assembly size of 3.8mm to 3mm, and the requirement of the total assembly size tolerance of the plastic part complete machine is met.
As shown in FIG. 20, the mold injection molding map of the plastic part is derived from the optimized HMI master control module rear cover 4 plastic part structure map scheme four and the Moldflow analysis data.
As shown in fig. 21, the mold structure diagram of the second plate mold cold runner cover half part of the optimal HMI master control module rear cover 4 plastic part structure diagram scheme four is designed rapidly from the optimal HMI master control module rear cover 4 plastic part structure diagram scheme four and 1 optimal side glue inlet gate position.
As shown in fig. 22, the mold structure diagram of the second plate mold cold runner moving mold part of the optimal HMI master control module back cover 4 plastic part structure diagram scheme is designed rapidly from the optimal HMI master control module back cover 4 plastic part structure diagram scheme iv and 1 optimal side glue inlet gate position.
Namely: by a systematic optimization design method of the plastic part structure diagram, an optimal plastic mold flow analysis diagram, an optimal plastic mold structure diagram and an optimal plastic part assembly diagram can be obtained.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A systematic optimization design method based on a plastic part structure diagram is characterized by comprising the following steps:
step 1, establishing a first scheme of a three-dimensional structure design diagram of the plastic part, operating Moldflow to finish an analysis report of the plastic part, and paying attention to a warping deformation value of the plastic part;
step 2, evaluating the warping deformation parameters of the plastic part, and comparing the plastic part general assembly diagram to analyze whether local structural optimization needs to be carried out on the plastic part, namely whether local optimization improvement needs to be carried out on the structural design diagram of the plastic part; if improvement is needed, the improved three-dimensional structure design drawing scheme II of the plastic part is analyzed by the method in the step 1, and the warpage deformation value of the plastic part is concerned;
step 3, if the local warping parameter of the plastic part is large, carrying out design optimization of a third scheme in the three-dimensional software aiming at the local warping part of the plastic part, analyzing the improved three-dimensional structure design drawing scheme of the plastic part by the method in the step 1, and paying attention to the warping deformation value of the plastic part;
step 4, checking the maximum deformation warpage value of the plastic part according to the size tolerance GB/T14486-2008 of the plastic part, and customizing the selection grade of the tolerance grade of the plastic module by combining the selected material of the plastic part, namely selecting high precision or common precision; according to the requirement of the fit tolerance precision of the plastic part assembly drawing and the tolerance grade in the plastic part dimension tolerance table, judging whether the improved three-dimensional model is the optimal structure drawing optimization scheme or not, and simultaneously judging whether the maximum warping parameter of the plastic part in the Moldflow analysis report of the improved three-dimensional model reaches the tolerance grade selected by the plastic part dimension tolerance GB/T14486-2008 or not;
step 5, comparing the optimization scheme of the three-dimensional model of the plastic part, the maximum warping value of the plastic model scheme in a Moldflow analysis report and the selection grade of the size tolerance of the plastic part in GB/T14486-2008 to obtain the optimal plastic part optimal structure design drawing scheme and the optimal size tolerance grade selection scheme of the plastic part, and defining the tolerance grade of the plastic mold according to GB/T14486-2008;
and 6, carrying out plastic mold structure design according to the optimal plastic part structure design drawing scheme and the optimal gate of Moldflow of the optimal plastic part structure design drawing scheme to obtain the optimal plastic part mold structure design drawing.
2. The method as claimed in claim 1, wherein the step 1 comprises the following steps:
step 1.1, establishing a first scheme of a three-dimensional structure design drawing of the plastic part through three-dimensional software;
step 1.2, importing the established three-dimensional structure design drawing scheme I of the plastic part into Moldflow software for diagnosis;
step 1.3, repairing the first scheme of the three-dimensional structure design drawing of the plastic part according to the diagnosis result obtained in the step 1.2, and exporting a Moldflow studio file when the error information of the main menu is displayed as 0;
step 1.4, importing the Moldflow studio file exported in the step 1.3 into newly-built Moldflow software, and automatically establishing a plastic part simulation system by the Moldflow software;
step 1.5: creating a grid in the plastic part simulation system in the step 1.4 to obtain a generated grid window;
step 1.6: setting a global side length parameter in the generated grid window, customizing grid matching and calculating the thickness of the double-layer grid, and immediately dividing the grid;
step 1.7: after the grid division is finished, carrying out double-layer grid statistics, and carrying out grid restoration according to the grid division result;
step 1.8: clicking repeatedly in a system engineering task, clicking a newly generated task system, clicking filling, setting an analysis sequence, and selecting a pouring gate position; the system automatically generates a pouring gate position;
step 1.9: performing process setting, performing double-click process setting to enter gate position setting, selecting a gate area positioner, and clicking a high-grade option to complete process setting;
step 1.10: clicking to start analysis to generate an optimal sprue position result;
step 1.11: based on the generated optimal gate position item, clicking to repeat to generate a new system item; selecting a newly generated item, selecting a gate position, and setting an analysis number: filling, pressure maintaining and warping;
step 1.12: arranging plastic materials to complete the material arrangement of the plastic parts;
step 1.13: performing process setting, performing double-click process setting to enter gate position setting, selecting a gate area positioner, and clicking a high-grade option to complete the process setting;
step 1.14: the system automatically judges whether the settings are correct or not; if the setting is abnormal, adjusting the setting parameters; if the setting is normal, starting analysis;
step 1.15: after the analysis is completed, focusing on the mold locking force parameter in the abnormal quality result of the plastic part;
step 1.16: selecting GB/T14486-2008 high-precision MT2a as 1.1, b as 1.2, and a as a dimensional tolerance value which is not influenced by a movable part of the mold according to the maximum length size of the plastic part of 439 mm; b is the dimensional tolerance value affected by the movable part of the mold; and judging whether the warping parameters in the Moldflow analysis report of the plastic part are consistent with the precision of the custom tolerance level.
3. The method as claimed in claim 2, wherein the value of the global side length array in step 1.6 is set to 60% of the average thickness of the plastic part.
4. The method for systematic optimization design of a plastic part structure diagram according to claim 2, wherein step 2 compares the warpage deformation in the plastic part simulation result with the high precision of GB/T14486-2008 to obtain a plastic part dimensional tolerance parameter range, that is, to obtain a plastic part warpage value parameter range; and if the warping deformation is slightly large, performing model optimization on the plastic part by using SOLidworks software to obtain a second scheme of the three-dimensional structure design drawing of the plastic part.
5. The method as claimed in claim 2, wherein the step 6 uses UG software to layout the mold structure diagram of the plastic part, including the exhaust system of the plastic mold, the waterway system of the plastic mold, and the sprue runner system of the plastic mold, so as to obtain the optimal structure diagram of the two-plate mold cold runner plastic mold.
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