CN112172022A - Method for molding metal plastic part coated with silicon rubber - Google Patents
Method for molding metal plastic part coated with silicon rubber Download PDFInfo
- Publication number
- CN112172022A CN112172022A CN202011097218.5A CN202011097218A CN112172022A CN 112172022 A CN112172022 A CN 112172022A CN 202011097218 A CN202011097218 A CN 202011097218A CN 112172022 A CN112172022 A CN 112172022A
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- CN
- China
- Prior art keywords
- metal
- injection molding
- plastic part
- silicon rubber
- shot
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- 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.)
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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
- B29C45/14819—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 completely encapsulated
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression 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
- B29C45/14—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
- B29C45/14065—Positioning or centering articles in the mould
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
- B29C2043/181—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated
- B29C2043/182—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated completely
-
- 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
- B29C45/14065—Positioning or centering articles in the mould
- B29C2045/14131—Positioning or centering articles in the mould using positioning or centering means forming part of the insert
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a method for molding a metal plastic part coated with silicon rubber, wherein the metal plastic part comprises a metal part and plastic coated on the metal part, one end of the metal part is exposed and provided with a positioning hole, and the thickness of the plastic at the middle section of the metal plastic part is uneven and discontinuous, and the method comprises the following steps: an injection molding: through the positioning of the positioning holes and the plastic at the two ends, the middle section of the metal plastic part is coated by the silicon rubber in an oil pressure or injection molding mode, and the thickness of the middle section is uniform and is basically flush with the plastic at the two ends; two-shot molding: the upper half part of the metal plastic part is coated by the silicon rubber in an oil pressure or injection molding mode through the positioning holes and the plastic positioning at the two ends; and three-shot molding: the lower half part of the metal plastic part is coated by the silicon rubber in an oil pressure or injection molding mode through the positioning of the positioning hole and the silicon rubber formed by two-shot molding.
Description
Technical Field
The invention relates to the field of rubber coating forming, in particular to a method for forming a metal plastic part coated with silicon rubber.
Background
Fig. 1 shows a metal plastic part, which includes a metal part and a plastic wrapped on the metal part, wherein one end of the metal part is exposed and provided with a positioning hole, and the thickness of the plastic at the middle section of the metal plastic part is not uniform and discontinuous. The outer ring of the metal plastic part needs to be wrapped with silicone rubber to obtain a required product (requiring uniform upper and lower encapsulation), as shown in fig. 7. Because only one positioning hole of the metal piece is exposed, the metal piece cannot be completely positioned in the die cavity; meanwhile, the silicone rubber raw material is harder, the thickness of the sheet is thicker, and after the sheet is placed into a cavity, a plastic part is lifted, the positioning effect is lost, and the sheet is easy to extrude and deform, so that the uniform and in-place encapsulation of the periphery of a product cannot be ensured.
Disclosure of Invention
The invention aims to provide a method for molding a metal plastic part coated with silicon rubber, which aims to solve the problems. Therefore, the invention adopts the following specific technical scheme:
a metal plastic part is coated with the silicone rubber forming method, the metal plastic part includes the metal part and wraps up the plastic on the metal part, wherein one end of the metal part is exposed and equipped with a locating hole, the plastic thickness of the middle section of the metal plastic part is uneven and discontinuous, said method comprises the following step:
an injection molding: positioning the metal plastic part in an injection molding die through the positioning hole and the plastics at two ends, and coating the middle section of the metal plastic part with silicon rubber in an oil pressure or injection molding mode, wherein the middle section is uniform in thickness and is basically flush with the plastics at two ends;
two-shot molding: positioning a product subjected to injection molding in a two-injection molding die through a positioning hole and plastic at two ends, and coating the upper half part of the metal plastic part with silicon rubber by adopting an oil pressure or injection molding mode;
and three-shot molding: and positioning the product after the two-shot molding in a three-shot molding die through a positioning hole and the silicon rubber formed by the two-shot molding, and coating the lower half part of the metal plastic part by the silicon rubber in an oil pressure or injection molding mode.
Further, the method comprises the steps of: after the first injection molding, the product is demolded and then transferred to a second injection molding mold.
Further, after the two-shot molding, the upper die of the two-shot molding die carries the product as the lower die of the three-shot molding die.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the requirements of uniform rubber coating and incapability of positioning of metal plastic part products are met;
2. the plastic part is supported and protected without deformation;
3. the problem of product because of the uneven plastic thickness of self, sunken of silicon rubber shrink production is improved.
Drawings
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
FIG. 1 is a schematic view of a metal-plastic part;
FIG. 2 is a schematic view of an injection molding positioning of a metal plastic part;
FIG. 3 is a schematic view of an injection molded metal-plastic part;
FIG. 4 is a schematic view of a two-shot molding positioning of a metal plastic part;
FIG. 5 is a schematic view of a product after two-shot molding of a metal plastic part;
FIG. 6 is a schematic view of the positioning of the metal-plastic part in the three-shot molding process;
FIG. 7 is a schematic view of a three-shot molded metal plastic part;
fig. 8 is a flow chart of the method of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 8, a method for molding a metal plastic part coated with silicone rubber will be described. The present embodiment is described by taking an oil pressure molding method as an example, and the injection molding method has the same steps and is different only in the mold and the injection system. The method comprises the following steps:
100. an injection molding:
the purpose is to coat the middle section of the metal plastic part with silicon rubber, thereby improving the problem of uneven thickness of the original middle section. In an injection molding process, the metal plastic part is positioned in the mold through the positioning hole and the plastic at both ends, as shown in fig. 2. Specifically, the positioning holes are positioned by the insert pins, and the plastic is supported and positioned by the cavity of the male die. An injection molded product (as shown in fig. 3) needs to be removed from an injection mold and transferred to a two-shot mold.
200. Two-shot molding:
the purpose is to make the silicon rubber cover the upper half part of the metal plastic part. In the two-shot molding, the metal plastic part is positioned by the positioning hole and the plastic at both ends, as shown in fig. 4. Specifically, the positioning holes are positioned by the insert pins, and the plastic is supported and positioned by the cavity of the male die. After the second injection molding, the product (see fig. 5) is not demolded from the upper mold (female mold), the upper mold and the product are directly transferred to the third injection molding mold together to be used as the lower mold (female mold) of the third injection molding mold, as shown in fig. 6, on one hand, the demolding time can be saved, the working efficiency is improved, on the other hand, the product cannot be injured in the demolding process, and the yield is improved. It should be understood that after two-shot molding, the product may also be demolded and transferred to a three-shot mold.
300. Three-shot molding:
the purpose is to make the silicone rubber cover the lower half part of the metal plastic part to obtain the final product (as shown in fig. 7). In the three-shot molding, the positioning is carried out through the positioning hole and the silicon rubber of the two-shot molding. Specifically, the positioning holes are positioned by the pins of the male mold, and the two-shot molded silicone rubber is positioned by the female mold without being demolded, as shown in fig. 6.
In the embodiment, the metal plastic part is coated with silicone rubber (labeled as rubber in the drawings), but it should be understood that the invention can also be applied to solid silicone rubber, liquid silicone rubber, special rubber, etc.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A metal plastic part wraps up the silicone rubber forming method, the metal plastic part includes the metal part and wraps up the plastic on the metal part, wherein one end of the metal part is exposed and equipped with a locating hole, the plastic thickness of the middle section of the metal plastic part is uneven and discontinuous, characterized by that, said method comprises the following steps:
an injection molding: positioning the metal plastic part in an injection molding die through the positioning hole and the plastics at two ends, and coating the middle section of the metal plastic part with silicon rubber in an oil pressure or injection molding mode, wherein the middle section is uniform in thickness and is basically flush with the plastics at two ends;
two-shot molding: positioning a product subjected to injection molding in a two-injection molding die through a positioning hole and plastic at two ends, and coating the upper half part of the metal plastic part with silicon rubber by adopting an oil pressure or injection molding mode;
and three-shot molding: and positioning the product after the two-shot molding in a three-shot molding die through a positioning hole and the silicon rubber formed by the two-shot molding, and coating the lower half part of the metal plastic part by the silicon rubber in an oil pressure or injection molding mode.
2. The method of claim 1, further comprising the step of: after the first injection molding, the product is demolded and then transferred to a second injection molding die.
3. A method according to claim 1 or 2, wherein after the two-shot moulding, the upper mould of the two-shot mould carries the product as the lower mould of the three-shot mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097218.5A CN112172022A (en) | 2020-10-14 | 2020-10-14 | Method for molding metal plastic part coated with silicon rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097218.5A CN112172022A (en) | 2020-10-14 | 2020-10-14 | Method for molding metal plastic part coated with silicon rubber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112172022A true CN112172022A (en) | 2021-01-05 |
Family
ID=73950020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011097218.5A Pending CN112172022A (en) | 2020-10-14 | 2020-10-14 | Method for molding metal plastic part coated with silicon rubber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112172022A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120049409A1 (en) * | 2010-09-01 | 2012-03-01 | Max Seal, Inc. | Method for manufacturing a gasket with an encapsulated metal band |
| CN105773907A (en) * | 2016-05-13 | 2016-07-20 | 东莞铭普光磁股份有限公司 | Electronic tag plug of optical fiber connector and injection molding method of electronic tag plug |
| CN207359543U (en) * | 2017-10-31 | 2018-05-15 | 深圳市立品塑胶模具制品有限公司 | Stent injection mold with fixed metal insert |
-
2020
- 2020-10-14 CN CN202011097218.5A patent/CN112172022A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120049409A1 (en) * | 2010-09-01 | 2012-03-01 | Max Seal, Inc. | Method for manufacturing a gasket with an encapsulated metal band |
| CN105773907A (en) * | 2016-05-13 | 2016-07-20 | 东莞铭普光磁股份有限公司 | Electronic tag plug of optical fiber connector and injection molding method of electronic tag plug |
| CN207359543U (en) * | 2017-10-31 | 2018-05-15 | 深圳市立品塑胶模具制品有限公司 | Stent injection mold with fixed metal insert |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210105 |
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| RJ01 | Rejection of invention patent application after publication |