CN112497635A - Injection molding process for wheel decorative cover insert - Google Patents
Injection molding process for wheel decorative cover insert Download PDFInfo
- Publication number
- CN112497635A CN112497635A CN202011247579.3A CN202011247579A CN112497635A CN 112497635 A CN112497635 A CN 112497635A CN 202011247579 A CN202011247579 A CN 202011247579A CN 112497635 A CN112497635 A CN 112497635A
- Authority
- CN
- China
- Prior art keywords
- piece
- injection molding
- aluminum
- mold
- aluminum piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
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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
- B29C45/14—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
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
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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
- B29C45/14—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
- B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
-
- 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
- B29C45/72—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29K2705/02—Aluminium
-
- 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
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3002—Superstructures characterized by combining metal and plastics, i.e. hybrid parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a wheel decorative cover insert injection molding process, which comprises the following steps: placing the manufactured aluminum piece into an injection mold, closing the mold, and heating the aluminum piece through the mold temperature of the injection mold to expand the aluminum piece; injecting plastic particle flow into the injection mould to perform injection molding on the injection molding piece; after the injection molding piece is fixed and shaped, the aluminum piece is cooled to normal temperature, the thermal expansion coefficient of the aluminum piece is larger than that of the plastic piece, and the aluminum piece is integrally shrunk and coated on the injection molding piece to form the wheel decorative cover. The invention can avoid the condition that the wheel decorative cover obtained by combination has uneven vision along the circumferential direction due to the existence of the manufacturing tolerance of the aluminum part and the injection molding part, improve the visual aesthetic property of the wheel decorative cover, reduce the manufacturing precision requirement of the aluminum part and improve the combination strength between the aluminum part and the injection molding part.
Description
Technical Field
The invention belongs to the technical field of machining of wheel decorative covers, and particularly relates to an injection molding process of a wheel decorative cover insert.
Background
The wheel trim cover of the vehicle not only can play a role in decorating the appearance of the wheel, but also can play a role in preventing external environmental pollutants from entering the interior for sealing, as shown in figure 1. In the present day with the increasing physical life, the requirement of the wheel trim as an aesthetic function is also increasing, and especially the requirement of the uniformity of the 'step' (the position indicated by figure 2) between the wheel trim aluminum piece and the injection molding piece along the circumferential direction is higher.
The prior wheel decorative cover firstly molds an aluminum piece (such as stamping processing) during processing, then the aluminum piece is used as an insert and put into an insert injection mold for injection molding of the injection molding, and the aluminum piece and the insert injection mold are combined into the wheel decorative cover. Because the aluminum part and the injection molding part are respectively molded, the molding precision of the aluminum part is controlled by stamping, and the molding precision of the injection molding part is controlled by injection molding. The production of aluminium parts and the production of injection-moulded parts are inevitably subject to mechanical manufacturing tolerances of 0.02mm to 0.05mm, which are within normal tolerances for the individual components. When the aluminum part is combined with the injection molding part, the height difference of the step position along the circumferential direction is uneven due to the combination of the two phase tolerances, and as long as the step with the height being more than 0.02mm exists, the visual experience of uneven circumferential direction during close-range visual inspection can exist, so that the attractiveness of the wheel decorative cover is influenced. The technical problem which cannot be solved by the existing manufacturing process is solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an injection molding process for a wheel decorative cover insert, which avoids the condition that the vision of the combined wheel decorative cover is uneven along the circumferential direction due to the existence of respective manufacturing tolerance of an aluminum piece and an injection molding piece, and improves the visual attractiveness of the wheel decorative cover.
The technical scheme adopted by the invention for solving the technical problem is to provide an injection molding process for a wheel trim cover insert, which comprises the following steps:
(1) placing the manufactured aluminum piece into an injection mold, closing the mold, and heating the aluminum piece through the mold temperature of the injection mold to expand the aluminum piece;
(2) injecting plastic particle flow into the injection mould to perform injection molding on the injection molding piece;
(3) after the injection molding piece is fixed and shaped, the aluminum piece is cooled to normal temperature, the thermal expansion coefficient of the aluminum piece is larger than that of the plastic piece, and the aluminum piece is integrally shrunk and coated on the injection molding piece to form the wheel decorative cover.
The mold temperature in the step (1) is controlled to be between 65 and 90 DEG C
In the step (1), the aluminum piece can be heated and expanded by an external heating device, then placed into an injection mold and closed, and the heating temperature is controlled to be 65-90 DEG C
The aluminum piece may also be another insert having a higher coefficient of thermal expansion than the plastic piece.
The aluminum piece is manufactured by stamping.
Advantageous effects
Firstly, the aluminum part is subjected to heating expansion treatment in the insert injection molding process, after the size of the aluminum part is temporarily adjusted to be increased, the temperature is recovered to normal temperature after the aluminum part is placed statically for a period of time after the injection molding is finished, the natural cold shrinkage of the aluminum part is larger than the shrinkage of the plastic part because the aluminum part has a larger thermal expansion coefficient than the plastic part, and the aluminum part insert can tightly wrap the plastic part after being reduced relative to the plastic part, so that the aluminum part is completely attached to the plastic part. The injection molding process of the injection molding piece is also the re-molding process of the aluminum piece, so that the aluminum piece does not have the tolerance existing in the original manufacturing process, the size of the plastic piece is matched, the wheel decorative cover is more uniform along the circumferential steps, and the visual attractiveness of the wheel decorative cover is improved.
Secondly, the invention can reduce the requirement on the manufacturing precision of the aluminum piece as the insert, can adjust the size of the aluminum piece or other inserts through later-stage heating expansion treatment, achieves the matching of high-level precision, reduces the modification times of the matching injection mold of the aluminum piece or other inserts, and directly fixes the aluminum piece or other inserts into the required size through the insert injection molding process after the size is adjusted through temperature.
Thirdly, the invention can improve the pull-off force of the insert in the insert process, and because the aluminum piece or other inserts generate internal deformation stress after the insert injection molding process is finished, the aluminum piece or other inserts are more strongly coated or inserted on the injection molding plastic body, so that the insert can be better prevented from falling off.
Drawings
Fig. 1 is a schematic structural view of a wheel hub with a wheel cover mounted thereon.
Fig. 2 is a schematic plan view of the wheel cover.
Fig. 3 is a schematic sectional structure view of a-a in fig. 2.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A wheel trim cover insert injection molding process comprises the following steps:
(1) placing the aluminum piece manufactured by stamping into an injection mold, closing the mold, heating the aluminum piece by the mold temperature of the injection mold to expand the aluminum piece, wherein the mold temperature is controlled to be 75 DEG C
(2) And injecting plastic particle flow into the injection mold through an injection molding machine, and performing injection molding on the injection molding piece.
(3) After the injection molding piece is fixed and shaped, the aluminum piece is cooled to normal temperature, the thermal expansion coefficient of the aluminum piece is larger than that of the plastic piece,
the aluminum part is integrally shrunk and coated on the injection molding part to form the wheel decorative cover.
In the step (1), the aluminum piece can be heated and expanded by an external heating device, then placed into an injection mold and closed, and the heating temperature is controlled to be 75 DEG C
According to the invention, the aluminum part is subjected to heating expansion treatment in the insert injection molding process, after the size of the aluminum part is temporarily adjusted to be increased, the temperature is recovered to normal temperature after the injection molding is finished and the aluminum part is placed for a period of time, because the aluminum part has a larger thermal expansion coefficient than the plastic part, the natural shrinkage of the aluminum part is larger than the shrinkage of the plastic part, and the aluminum part insert can tightly coat the plastic part after being reduced relative to the plastic part, so that the aluminum part is completely attached to the plastic part. The injection molding process of the injection molding piece is also the re-molding process of the aluminum piece, so that the aluminum piece does not have the tolerance existing in the original manufacturing process, the size of the plastic piece is matched, the wheel decorative cover is more uniform along the circumferential steps, and the visual attractiveness of the wheel decorative cover is improved.
In addition, it should be noted that, not only the aluminum piece as the insert may be processed by the process for the wheel cover, but also other inserts with thermal expansion coefficient larger than that of the plastic piece may be processed by the process for the wheel cover, and the invention should also be regarded as the scope of the claimed invention.
Claims (5)
1. A wheel trim cover insert injection molding process comprises the following steps:
(1) placing the manufactured aluminum piece into an injection mold, closing the mold, and heating the aluminum piece through the mold temperature of the injection mold to expand the aluminum piece;
(2) injecting plastic particle flow into the injection mould to perform injection molding on the injection molding piece;
(3) after the injection molding piece is fixed and shaped, the aluminum piece is cooled to normal temperature, the thermal expansion coefficient of the aluminum piece is larger than that of the plastic piece, and the aluminum piece is integrally shrunk and coated on the injection molding piece to form the wheel decorative cover.
2. The wheel trim cover insert injection molding process according to claim 1, wherein: the mold temperature in the step (1) is controlled to be 65-90 ℃.
3. The wheel trim cover insert injection molding process according to claim 1, wherein: in the step (1), the aluminum piece can be heated and expanded by an external heating device, then placed into an injection mold and closed, and the heating temperature is controlled to be 65-90 ℃.
4. The wheel trim cover insert injection molding process according to claim 1, wherein: the aluminum piece may also be another insert having a higher coefficient of thermal expansion than the plastic piece.
5. The wheel trim cover insert injection molding process according to claim 1, wherein: the aluminum piece is manufactured by stamping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247579.3A CN112497635A (en) | 2020-11-10 | 2020-11-10 | Injection molding process for wheel decorative cover insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247579.3A CN112497635A (en) | 2020-11-10 | 2020-11-10 | Injection molding process for wheel decorative cover insert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112497635A true CN112497635A (en) | 2021-03-16 |
Family
ID=74957478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011247579.3A Pending CN112497635A (en) | 2020-11-10 | 2020-11-10 | Injection molding process for wheel decorative cover insert |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112497635A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012024832A1 (en) * | 2010-08-24 | 2012-03-01 | 深圳庆和胶粘制品有限公司 | Product with metallic component and plastic component and shaping method thereof |
| CN102717474A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 12 and metal insert |
| CN102729402A (en) * | 2012-06-28 | 2012-10-17 | 金发科技股份有限公司 | Molding process for combination of nylon resin and metal insert |
| CN103862621A (en) * | 2014-03-28 | 2014-06-18 | 上海幸福摩托车有限公司 | Production method of fuel pump plastic part with metal insert |
| CN104842504A (en) * | 2015-05-12 | 2015-08-19 | 苏州万隆汽车零部件股份有限公司 | Insert injection molding process of automobile running board |
| CN207607042U (en) * | 2017-12-01 | 2018-07-13 | 刘维锋 | A kind of preparation facilities of mobile phone metal plastic part |
| CN110561704A (en) * | 2019-10-22 | 2019-12-13 | 河源市豪业塑胶五金制品有限公司 | Double-injection molding process of plastic product |
| CN210651640U (en) * | 2019-06-25 | 2020-06-02 | 昆山世硕精密模具有限公司 | Injection mold with preheat function |
| CN111605132A (en) * | 2020-06-23 | 2020-09-01 | 广东美的厨房电器制造有限公司 | Manufacturing method of appearance piece and appearance piece |
-
2020
- 2020-11-10 CN CN202011247579.3A patent/CN112497635A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012024832A1 (en) * | 2010-08-24 | 2012-03-01 | 深圳庆和胶粘制品有限公司 | Product with metallic component and plastic component and shaping method thereof |
| CN102717474A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 12 and metal insert |
| CN102729402A (en) * | 2012-06-28 | 2012-10-17 | 金发科技股份有限公司 | Molding process for combination of nylon resin and metal insert |
| CN103862621A (en) * | 2014-03-28 | 2014-06-18 | 上海幸福摩托车有限公司 | Production method of fuel pump plastic part with metal insert |
| CN104842504A (en) * | 2015-05-12 | 2015-08-19 | 苏州万隆汽车零部件股份有限公司 | Insert injection molding process of automobile running board |
| CN207607042U (en) * | 2017-12-01 | 2018-07-13 | 刘维锋 | A kind of preparation facilities of mobile phone metal plastic part |
| CN210651640U (en) * | 2019-06-25 | 2020-06-02 | 昆山世硕精密模具有限公司 | Injection mold with preheat function |
| CN110561704A (en) * | 2019-10-22 | 2019-12-13 | 河源市豪业塑胶五金制品有限公司 | Double-injection molding process of plastic product |
| CN111605132A (en) * | 2020-06-23 | 2020-09-01 | 广东美的厨房电器制造有限公司 | Manufacturing method of appearance piece and appearance piece |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |