CN116533436A - Injection molding and coating integrated process for automotive interior parts - Google Patents
Injection molding and coating integrated process for automotive interior parts Download PDFInfo
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- CN116533436A CN116533436A CN202310769597.5A CN202310769597A CN116533436A CN 116533436 A CN116533436 A CN 116533436A CN 202310769597 A CN202310769597 A CN 202310769597A CN 116533436 A CN116533436 A CN 116533436A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 100
- 238000000576 coating method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011248 coating agent Substances 0.000 title claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000009966 trimming Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 11
- 229920001875 Ebonite Polymers 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 8
- 239000011265 semifinished product Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 239000011247 coating layer Substances 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 229920005906 polyester polyol Polymers 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 210000004243 sweat Anatomy 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- HSJKGGMUJITCBW-UHFFFAOYSA-N 3-hydroxybutanal Chemical compound CC(O)CC=O HSJKGGMUJITCBW-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004952 Polyamide Substances 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 229920001225 polyester resin Polymers 0.000 claims description 6
- 239000004645 polyester resin Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920001046 Nanocellulose Polymers 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000002075 anti-alcohol Effects 0.000 claims description 3
- 230000008033 biological extinction Effects 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 238000009960 carding Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 claims description 3
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000012798 spherical particle Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 3
- 238000007591 painting process Methods 0.000 claims 1
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 2
- 230000003670 easy-to-clean Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- 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
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
- B29C2045/0008—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements the fibres being oriented randomly
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C2045/0079—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping applying a coating or covering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/58—Upholstery or cushions, e.g. vehicle upholstery or interior padding
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding and coating integrated process for automotive upholstery, which comprises the following steps: s1, firstly, using ABS hard rubber to make a framework through injection molding, and trimming burrs; s2, spraying the frame with the trimmed flash, and then cooling for later use; s3, placing the sprayed and cooled framework into an injection molding grinding tool of the interior trim part, heating and melting the PPT soft rubber, injecting into a mold cavity, and performing pressure maintaining and cooling to form a soft coating layer on the framework to form a double-layer structure; s4, directly performing secondary spraying under the condition that the double-layer injection molding piece is not completely cooled, and then cooling to prepare a semi-finished product interior trim part; s5, trimming, correcting and detecting the semi-finished product of the interior trim part to prepare the automobile interior trim part. The invention completes the injection molding and the coating integrally, thereby simplifying the prior art; and secondly, fibrilia is added into the framework, so that the strength of the material after injection molding is improved, the durability is improved, the material is sun-proof, easy to clean, and has antibacterial and wear-resistant properties.
Description
Technical Field
The invention belongs to the field of automotive interior parts, and particularly relates to an injection molding and coating integrated process for automotive interior parts.
Background
With the continuous development of the automobile industry, the improvement of the quality of automobile interior trim has become an important point in automobile development. In the field of automobiles, a soft leather injection molding coating process belongs to a new process type, and the surface perceived quality of automobile interior trim can be improved by using the process;
the upper decorative plate of a certain automobile door plate is taken as a research object in the research of soft leather injection molding coating process of automotive upholstery, an upper decorative plate framework and a coating finite element model are established based on Moldflow software, the design of a simulation analysis scheme and the setting of main parameters are completed, the molding simulation analysis of the upper decorative plate framework and the coating is carried out, the molding of the upper decorative plate is analyzed according to the simulation result, and whether the product has molding defects such as short shot, sink mark, weld mark, shrinkage, warping and the like is checked. Then, aiming at the problems pointed out by the formability analysis results, based on a field mouth test design method and combined with Moldflow simulation analysis, the influence rules of melt temperature, mold temperature, injection time, pressure maintaining pressure and pressure maintaining time on the buckling deformation of the framework and the influence rules of melt temperature, injection time, V/P switching (% by volume), pressure maintaining pressure and pressure maintaining time on the volume shrinkage of the coating are researched, and the optimal technological parameter combination is obtained.
However, the above process cannot meet the increasingly advanced automobile industry, and meanwhile, the existing injection molding and coating of the automotive interior parts are separately finished, and the process is complex, so we propose an integrated injection molding and coating process of the automotive interior parts.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an integrated injection molding and coating process for automotive upholstery.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an integrated injection molding and coating process for automotive upholstery comprises the following steps:
s1, firstly, using ABS hard rubber to make a framework through injection molding, and trimming burrs;
s2, spraying the frame with the trimmed flash, and then cooling for later use;
s3, placing the sprayed and cooled framework into an injection molding grinding tool of the interior trim part, heating and melting the PPT soft rubber, injecting into a mold cavity, and performing pressure maintaining and cooling to form a soft coating layer on the framework to form a double-layer structure;
s4, directly performing secondary spraying under the condition that the double-layer injection molding piece is not completely cooled, and then cooling to prepare a semi-finished product interior trim part;
s5, trimming, correcting and detecting the semi-finished product of the interior trim part to prepare the automobile interior trim part.
Preferably, the skeleton injection molding in the step S1 is performed by the following specific method:
1) Heating and melting injection molding raw materials;
2) Placing an insert in the mold cavity;
3) The melted injection molding raw material is injected into a mold cavity through injection molding equipment;
4) And (5) maintaining pressure, blowing nitrogen and cooling the die cavity.
Preferably, when the framework is made by using ABS hard rubber injection molding, the strength of the fibrilia reinforced framework is added in the ABS hard rubber injection molding, specifically:
carding and shearing fibrilia to obtain short fiber,
mixing ethyl orthosilicate, absolute ethyl alcohol, hydrochloric acid and deionized water at room temperature to obtain solution A, and mixing hydrochloric acid, absolute ethyl alcohol and deionized water according to a volume ratio to obtain solution B;
adding the liquid B into the liquid A while stirring, wherein the dripping speed is 1 drop for 4-6 seconds, stirring after the dripping is finished, adding nanocrystalline cellulose into the mixed solution, and stirring again;
adding fibrilia, stirring uniformly, filtering, drying in supercritical carbon dioxide environment, and repeatedly soaking until the mass percentage of fibrilia loaded substances is 10-15%, thus obtaining modified fibrilia;
and (3) uniformly mixing the modified fibrilia with ABS hard gum, and feeding the mixture into an injection molding machine for injection molding.
Preferably, the spraying is specifically:
when in use, the spray material is firstly placed in a solvent for cleaning and drying, so that no pollution is caused;
mixing the paint with a curing agent, and adjusting the viscosity to a proper state by using a solvent;
spraying the mixed paint on a casing of a cash dispenser, standing at 28 ℃ for 10 minutes to finish, and then standing the spraying material at 70 ℃ for 30 minutes to dry.
Preferably, the spray coating material used in the spraying comprises one or a mixture of a plurality of hydroxyl acrylic resin, polyester resin, organic matting powder and polyamide wax.
Preferably, the spray coating parameters are as follows:
the solid content of the coating is 36-40%, the viscosity is 63-67KU, and the specific gravity is 0.96-1.0g/cm; the adhesive force is more than 1 grade; the pencil hardness Mitsubishi pencil F/500 is pushed by 45 degrees under load, and no trace exists; anti-alcohol wiping 500g load, 80 back and forth; resistance to rubber friction, 500g load, 400 back and forth;
butanone wiping resistance, 50 times/500 g load; the artificial sweat is resisted, the artificial sweat is placed at 40 ℃ for 48 hours, the cross-hatch is not obviously changed, and the artificial sweat is not fallen off; the paper tape friction resistance and the load of 170gm are carried out for 5 times without bottom leakage; the ultraviolet light resistance is 500 hours, and the delta E is less than or equal to 4.0.
Preferably, the polyester resin is a solvent-free high viscosity slightly branched polyester polyol having a hydroxyl number of 4.3 and a viscosity of 2000mpa.s at 23 ℃ and an equivalent 388;
the organic extinction powder is approximately spherical particles of aldol condensate of urea formaldehyde, the density is 1.41g/cm, the thermal decomposition temperature is above 200 ℃, the refractive index is 1.607, the PH value is 8-9.5, and the solid content is above 83%;
the polyamide wax has a solids content of 20% ± 5% of a milky white paste.
Preferably, the trimming flash adopts an intelligent trimming flash system, and an injection molding flash area identification unit is arranged in the system, so that the intelligent trimming flash is injection molded.
Preferably, the injection molding flash region identification unit specifically comprises the following identification processes:
acquiring an injection molding image, and performing filtering treatment on the injection molding image to obtain an injection molding edge map; fitting the edge of the injection molding image into an injection molding edge curve based on the positions of edge pixel points, carrying out sectional processing on the injection molding edge curve, calculating the degree of abnormality of each section of edge curve, and determining whether each section of edge curve belongs to an abnormal edge according to the calculated degree of abnormality;
carrying out sectional processing on curves belonging to abnormal edges to obtain a plurality of convex areas, determining the pointing vector of each convex area, finding out the position of a trusted point corresponding to each convex area by utilizing the edge of each convex area and the pointing vector determined by each convex area, carrying out statistics on the trusted point on each design edge, and taking the design edge with the most trusted points as the real edge of the injection molding piece;
and determining a flash area of the injection molding piece according to the flash abnormal edge and the real edge of the injection molding piece.
The invention has the technical effects and advantages that: compared with the prior art, the injection molding and coating integrated process for the automotive interior trim part provided by the invention is completed integrally, and the existing process is simplified;
secondly, the fibrilia is added into the framework, so that the strength of the material after injection molding is improved, the durability is improved, the material is sun-proof, easy to clean, and has antibacterial and wear-resistant properties;
in addition, the gas-assisted injection molding is performed in a nitrogen blowing mode, so that the efficiency is high, and the product qualification rate can be remarkably improved by gas-assisted injection molding, so that the generation of waste is reduced.
Drawings
FIG. 1 is a flow chart of an injection molding and painting integrated process of an automotive interior part according to the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an injection molding and coating integrated process of an automotive interior part as shown in fig. 1, wherein the injection molding and coating integrated process is completed, and the existing process is simplified.
The method comprises the following steps:
s1, firstly, using ABS hard rubber to make a framework through injection molding, and trimming burrs;
as a possible scheme adopted in this embodiment, the skeleton injection molding in step S1 is specifically as follows:
1) Heating and melting injection molding raw materials;
2) Placing an insert in the mold cavity;
3) The melted injection molding raw material is injected into a mold cavity through injection molding equipment;
4) Maintaining pressure, blowing nitrogen and cooling the die cavity;
further, when the framework is made by using ABS hard rubber injection molding, the strength of the fibrilia reinforced framework is added in the ABS hard rubber injection molding, specifically:
carding and shearing fibrilia to obtain short fiber,
mixing ethyl orthosilicate, absolute ethyl alcohol, hydrochloric acid and deionized water at room temperature to obtain solution A, and mixing hydrochloric acid, absolute ethyl alcohol and deionized water according to a volume ratio to obtain solution B;
adding the liquid B into the liquid A while stirring, wherein the dripping speed is 1 drop for 4-6 seconds, stirring after the dripping is finished, adding nanocrystalline cellulose into the mixed solution, and stirring again;
adding fibrilia, stirring uniformly, filtering, drying in supercritical carbon dioxide environment, and repeatedly soaking until the mass percentage of fibrilia loaded substances is 10-15%, thus obtaining modified fibrilia;
uniformly mixing the modified fibrilia with ABS hard gum, and feeding the mixture into an injection molding machine for injection molding;
s2, spraying the frame with the trimmed flash, and then cooling for later use;
s3, placing the sprayed and cooled framework into an injection molding grinding tool of the interior trim part, heating and melting the PPT soft rubber, injecting into a mold cavity, and performing pressure maintaining and cooling to form a soft coating layer on the framework to form a double-layer structure;
s4, directly performing secondary spraying under the condition that the double-layer injection molding piece is not completely cooled, and then cooling to prepare a semi-finished product interior trim part;
s5, trimming, correcting and detecting the semi-finished product of the interior trim part to prepare the automobile interior trim part.
The spraying method adopts the following modes:
specifically, the spraying of the (c) is as follows:
when in use, the spray material is firstly placed in a solvent for cleaning and drying, so that no pollution is caused;
mixing the paint with a curing agent, and adjusting the viscosity to a proper state by using a solvent;
spraying the mixed paint on a casing of a cash dispenser, standing at 28 ℃ for 10 minutes to finish, and then standing the spraying material at 70 ℃ for 30 minutes to dry.
The spray coating used in the spraying comprises one or a mixture of a plurality of hydroxyl acrylic resin, polyester resin, organic matting powder and polyamide wax.
Further, the spray coating parameters are as follows:
the solid content of the coating is 36-40%, the viscosity is 63-67KU, and the specific gravity is 0.96-1.0g/cm; the adhesive force is more than 1 grade; the pencil hardness Mitsubishi pencil F/500 is pushed by 45 degrees under load, and no trace exists; anti-alcohol wiping 500g load, 80 back and forth; resistance to rubber friction, 500g load, 400 back and forth;
butanone wiping resistance, 50 times/500 g load; the artificial sweat is resisted, the artificial sweat is placed at 40 ℃ for 48 hours, the cross-hatch is not obviously changed, and the artificial sweat is not fallen off; the paper tape friction resistance and the load of 170gm are carried out for 5 times without bottom leakage; the ultraviolet light resistance is 500 hours, and the delta E is less than or equal to 4.0.
The polyester resin is solvent-free high-viscosity slightly branched polyester polyol, the hydroxyl value of the polyester polyol is 4.3, and the viscosity of the polyester polyol is 2000mPa.s at 23 ℃ and the equivalent of the polyester polyol is 388;
the organic extinction powder is approximately spherical particles of aldol condensate of urea formaldehyde, the density is 1.41g/cm, the thermal decomposition temperature is above 200 ℃, the refractive index is 1.607, the PH value is 8-9.5, and the solid content is above 83%;
the polyamide wax has a solids content of 20% + -5% as a milky white paste.
The embodiment also needs to explain that the trimming flash adopts an intelligent trimming system, an injection molding flash area identification unit is arranged in the system, and the intelligent trimming is injection molding flash; the injection molding flash region identification unit specifically comprises the following identification processes:
acquiring an injection molding image, and performing filtering treatment on the injection molding image to obtain an injection molding edge map;
fitting the edge of the injection molding image into an injection molding edge curve based on the positions of edge pixel points, carrying out sectional processing on the injection molding edge curve, calculating the degree of abnormality of each section of edge curve, and determining whether each section of edge curve belongs to an abnormal edge according to the calculated degree of abnormality;
carrying out sectional processing on curves belonging to abnormal edges to obtain a plurality of convex areas, determining the pointing vector of each convex area, finding out the position of a trusted point corresponding to each convex area by utilizing the edge of each convex area and the pointing vector determined by each convex area, carrying out statistics on the trusted point on each design edge, and taking the design edge with the most trusted points as the real edge of the injection molding piece;
the method for determining the pointing vector is as follows: traversing each convex area from two ends to the middle, determining normals on pixel point positions of two edge curves selected each time, and determining a pointing vector according to the obtained normals; the method comprises the following steps: the pointing vector includes: if the obtained normals are parallel, pointing to the inner side of the injection molding piece along the normal direction by taking the selected two edge pixel points as starting points, and generating a pointing vector;
if the obtained normals intersect: marking intersection points of all intersecting normals, and obtaining density center points of all normal intersection points by using a density clustering algorithm;
acquiring the length of the convex region edge curve, traversing the convex region edge curve to determine a division point, and determining a starting point of the pointing vector according to the division ratio of the length of the convex region edge curve before the division point and the length of the convex region edge curve after the division point;
the method comprises the steps of starting from a division point with a division ratio of 1, pointing to the inner side of an injection molding piece along a straight line determined by the division point and a density center point, and generating a pointing vector.
And determining a flash area of the injection molding piece according to the flash abnormal edge and the real edge of the injection molding piece.
In addition, the method for determining the trusted point location is as follows: determining a ray by taking the starting point of the pointing vector as a starting point and taking the pointing vector as a direction vector, and solving the directional derivative of the gray scale of each pixel point on the emergent line in the direction of the pointing vector;
taking the absolute value of the directional derivative of the gray level of the pixel point as a vertical axis, the starting point of the pointing vector as an origin, and the determined ray as a horizontal axis, establishing a directional derivative curve, and deriving the directional derivative curve to obtain a directional derivative curve;
and comparing the set threshold value with the derivative of the absolute value of the directional derivative of each pixel point, marking the pixel points with the derivative of the absolute value of the directional derivative of the pixel points larger than the set threshold value, and extracting the minimum pixel point of the abscissa in the marked pixel points, wherein the pixel points are trusted points.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. An integrated injection molding and coating process for automotive upholstery is characterized by comprising the following steps:
s1, firstly, using ABS hard rubber to make a framework through injection molding, and trimming burrs;
s2, spraying the frame with the trimmed flash, and then cooling for later use;
s3, placing the sprayed and cooled framework into an injection molding grinding tool of the interior trim part, heating and melting the PPT soft rubber, injecting into a mold cavity, and performing pressure maintaining and cooling to form a soft coating layer on the framework to form a double-layer structure;
s4, directly performing secondary spraying under the condition that the double-layer injection molding piece is not completely cooled, and then cooling to prepare a semi-finished product interior trim part;
s5, trimming, correcting and detecting the semi-finished product of the interior trim part to prepare the automobile interior trim part.
2. The integrated injection molding and coating process for automotive upholstery according to claim 1, wherein: the skeleton injection molding in the step S1 comprises the following specific steps:
1) Heating and melting injection molding raw materials;
2) Placing an insert in the mold cavity;
3) The melted injection molding raw material is injected into a mold cavity through injection molding equipment;
4) And (5) maintaining pressure, blowing nitrogen and cooling the die cavity.
3. The integrated injection molding and coating process for automotive upholstery according to claim 1, wherein: when the ABS hard rubber is used for injection molding to prepare the framework, the strength of the fibrilia reinforced framework is added in the ABS hard rubber injection molding, and the method specifically comprises the following steps:
carding and shearing fibrilia to obtain short fiber,
mixing ethyl orthosilicate, absolute ethyl alcohol, hydrochloric acid and deionized water at room temperature to obtain solution A, and mixing hydrochloric acid, absolute ethyl alcohol and deionized water according to a volume ratio to obtain solution B;
adding the liquid B into the liquid A while stirring, wherein the dripping speed is 1 drop for 4-6 seconds, stirring after the dripping is finished, adding nanocrystalline cellulose into the mixed solution, and stirring again;
adding fibrilia, stirring uniformly, filtering, drying in supercritical carbon dioxide environment, and repeatedly soaking until the mass percentage of fibrilia loaded substances is 10-15%, thus obtaining modified fibrilia;
and (3) uniformly mixing the modified fibrilia with ABS hard gum, and feeding the mixture into an injection molding machine for injection molding.
4. The integrated injection molding and coating process for automotive upholstery according to claim 1, wherein: the spraying is specifically as follows:
when in use, the spray material is firstly placed in a solvent for cleaning and drying, so that no pollution is caused;
mixing the paint with a curing agent, and adjusting the viscosity to a proper state by using a solvent;
spraying the mixed paint on a casing of a cash dispenser, standing at 28 ℃ for 10 minutes to finish, and then standing the spraying material at 70 ℃ for 30 minutes to dry.
5. The integrated injection molding and coating process for automotive upholstery according to claim 4, wherein: the spray coating adopted in the spraying comprises one or a mixture of a plurality of hydroxyl acrylic resin, polyester resin, organic matting powder and polyamide wax.
6. The integrated injection molding and coating process for automotive upholstery according to claim 5, wherein: the parameters of the spray coating are as follows:
the solid content of the coating is 36-40%, the viscosity is 63-67KU, and the specific gravity is 0.96-1.0g/cm; the adhesive force is more than 1 grade; the pencil hardness Mitsubishi pencil F/500 is pushed by 45 degrees under load, and no trace exists; anti-alcohol wiping 500g load, 80 back and forth; resistance to rubber friction, 500g load, 400 back and forth;
butanone wiping resistance, 50 times/500 g load; the artificial sweat is resisted, the artificial sweat is placed at 40 ℃ for 48 hours, the cross-hatch is not obviously changed, and the artificial sweat is not fallen off; the paper tape friction resistance and the load of 170gm are carried out for 5 times without bottom leakage; the ultraviolet light resistance is 500 hours, and the delta E is less than or equal to 4.0.
7. The integrated injection molding and painting process for automotive upholstery according to any one of claims 4-6, wherein: the polyester resin is solvent-free high-viscosity slightly branched polyester polyol, the hydroxyl value of the polyester polyol is 4.3, and the viscosity of the polyester polyol is 2000mPa.s at 23 ℃ and the equivalent of the polyester polyol is 388;
the organic extinction powder is approximately spherical particles of aldol condensate of urea formaldehyde, the density is 1.41g/cm, the thermal decomposition temperature is above 200 ℃, the refractive index is 1.607, the PH value is 8-9.5, and the solid content is above 83%;
the polyamide wax has a solids content of 20% ± 5% of a milky white paste.
8. The integrated injection molding and coating process for automotive upholstery according to claim 1, wherein: the trimming flash adopts an intelligent flash cleaning system, an injection molding flash area identification unit is arranged in the system, and the intelligent flash is injection molded.
9. The integrated injection molding and coating process for automotive upholstery according to claim 8, wherein: the injection molding flash region identification unit specifically comprises the following identification processes:
acquiring an injection molding image, and performing filtering treatment on the injection molding image to obtain an injection molding edge map;
fitting the edge of the injection molding image into an injection molding edge curve based on the positions of edge pixel points, carrying out sectional processing on the injection molding edge curve, calculating the degree of abnormality of each section of edge curve, and determining whether each section of edge curve belongs to an abnormal edge according to the calculated degree of abnormality;
carrying out sectional processing on curves belonging to abnormal edges to obtain a plurality of convex areas, determining the pointing vector of each convex area, finding out the position of a trusted point corresponding to each convex area by utilizing the edge of each convex area and the pointing vector determined by each convex area, carrying out statistics on the trusted point on each design edge, and taking the design edge with the most trusted points as the real edge of the injection molding piece;
and determining a flash area of the injection molding piece according to the flash abnormal edge and the real edge of the injection molding piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310769597.5A CN116533436A (en) | 2023-06-28 | 2023-06-28 | Injection molding and coating integrated process for automotive interior parts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310769597.5A CN116533436A (en) | 2023-06-28 | 2023-06-28 | Injection molding and coating integrated process for automotive interior parts |
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