CN106608022A - Gas-assisted injection molding process for automobile interior trim - Google Patents
Gas-assisted injection molding process for automobile interior trim Download PDFInfo
- Publication number
- CN106608022A CN106608022A CN201710001649.9A CN201710001649A CN106608022A CN 106608022 A CN106608022 A CN 106608022A CN 201710001649 A CN201710001649 A CN 201710001649A CN 106608022 A CN106608022 A CN 106608022A
- Authority
- CN
- China
- Prior art keywords
- gas
- air flue
- injection molding
- molding process
- pressure
- 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
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76732—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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76775—Fluids
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The invention discloses a gas-assisted injection molding process for an automobile interior trim. The gas-assisted injection molding process comprises injection molding pressure maintaining, product air passage formation by high-pressure air blowing, pressure maintaining for high-pressure gases in an air passage and pressure maintaining for normal-pressure gases in the air passage; during injection molding pressure maintaining, a die at one side of a product appearance surface is internally provided with a plurality of heating pipes at equal intervals along the axis of the air passage of a product, the axes of the heating pipes are arranged along the normal direction of the product appearance surface, and the distance from the end surface of each of the heating pipes to the product appearance surface is 20-25mm; and before rubber injection molding, the preheating temperature of each of the heating pipes is 1/2 of a rubber melting temperature, and the preheating temperature of the die is 30-35 DEG C. By using the injection molding process, the defect that whity bright marks are generated on a surface corresponding to the position of the air passage can be eliminated.
Description
Technical field
The present invention relates to a kind of gas-assisted injection molding process, more particularly to a kind of being applied to have gas path cross sections product big
And the automotive upholstery gas-assisted injection molding process of airway length length.
Background technology
The gas path cross sections product of orthodox car interior trim injecting products is oval or circular, and cross-sectional area is smaller,
And with air flue outer wall and inwall substantially into same or analogous shape.But part vehicle is in order to increase aesthetic feeling, air flue design
Sectional area it is very big, using traditional injection mould and technique can with air flue produce border blushing, affect product it is attractive in appearance,
Product percent of pass is low.
The content of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of automotive upholstery gas aided injection mould work
Skill, solves the problems, such as that product produces the bright print turned white on duct position correspondence surface.
The technical scheme is that such：A kind of automotive upholstery gas-assisted injection molding process, including Injection hold pressure,
High pressure blow-gas form product air flue, air flue inner high voltage gas pressurize, normal pressure gas pressurize in air flue, during the Injection hold pressure
Some heating tubes are equally spaced along product air flue axis in the mould of Surface Appearance side, the heating tube axis is in product
Product appearance normal direction arrangement, heating tube end face distance 20～25mm of Surface Appearance；Before sizing material injection, the heating tube is pre-
Hot temperature is the 1/2 of sizing material melt temperature, and the preheating temperature of the mould is 30～35 DEG C.
Preferably, the spacing of the heating tube is 20～25mm.
Further, normal pressure gas pressurize punctures air flue and is exhausted after starting by lancet in the air flue,
Continue to carry out pressurize with normal pressure gas while air flue is vented by punctured hole.
Further, it is described to puncture air flue in product flash position when puncturing air flue.
Further, described puncturing after air flue normal pressure gas pressurize in the air flue starts 1s is carried out.
Preferably, 135 ± 2Ba of gas pressure position, gassing time 1s during the high pressure blow-gas.
Preferably, 140 ± 2Ba of gas pressure, 15 ± 1s of dwell time during the air flue inner high voltage gas pressurize.
Preferably, 90 ± 2Ba of gas pressure, 10 ± 1s of dwell time during normal pressure gas pressurize in the air flue.
The beneficial effect of technical scheme provided by the present invention is：The very big automotive upholstery product of sectional area of air passage is adopted
When existing Shooting Technique is produced, because sizing material of the gas with more than 200 ° is contacted, air flue inner wall surface is quickly cooled down, and is formed harder
Cooling layer, cause subsequent gases to support air flue inner wall shape and be expanded to and be consistent with outer wall.Therefore the equal shape of half
It is circular air flue into section so that the wall thickness variation of local is defined between air flue and Surface Appearance, and then in product table
Face forms the bright print of turning white of border.And technical solution of the present invention is adopted, by local heating, make the sizing material in air flue blow
It is constantly in journey and compares hot melt body state, slow down hardening by cooling process, allow sizing material to be easier to blow, makes the shape base of inwall
This is consistent with outer wall, reduces wall thickness variation and then reduces bright print generation.Positive normal pressure strength is made additionally by air flue is punctured
During body pressurize, the cooling of product duct position is strengthened in gas flowing in air flue, reduces the cooling cycle, on the one hand ensure that product air flue
Interior pressure is appropriate, on the other hand accelerates cooling to make product duct position rapid shaping, so as to being not likely to produce air flue explosion or caving in,
Improve product percent of pass, reduces cost.
Description of the drawings
Fig. 1 is automobile map bag structure schematic diagram.
Fig. 2 is the AA schematic cross-sections of Fig. 1.
Fig. 3 is the B regions partial schematic diagram of Fig. 2.
Fig. 4 is airway cross-section schematic diagram after the production of existing Shooting Technique.
Fig. 5 is heating tube and automobile map pocket product relative position schematic diagram.
Fig. 6 is airway cross-section schematic diagram after present invention process production.
Specific embodiment
With reference to embodiment, the invention will be further described, but not as a limitation of the invention.
By taking automobile map pocket as an example, incorporated by reference to Fig. 1 to Fig. 3, the product design is with the big and long gas of a sectional area
Road 1, the cross-sectional area 160mm of air flue 12, the total length 450mm of air flue 1.When being produced with existing Shooting Technique, easy air flue in the diagram
Wall thickness variation larger part 2 between Surface Appearance forms bright print defect.
The mould for producing the product can be set using technical scheme disclosed in Chinese patent CNCN104908258A on dynamic model
There are formed product chamber and flash groove, flash groove is connected with formed product chamber and communicating position is located at product air flue.In dynamic model
Air tube is set at upper and product duct position, is arranged at flash groove location and is punctured mechanism, puncturing mechanism includes puncturing oil cylinder and thorn
Broken pin.In addition incorporated by reference to shown in Fig. 5, a heating tube 2 is arranged at interval of 20～25mm along product air flue axis 3 on dynamic model,
The axis of heating tube 2 is in Surface Appearance normal direction arrangement, the end face distance 20～25mm of Surface Appearance of heating tube 2.
The concrete production method of the present invention is such, and by traditional handicraft injection production, the injection of plastic melt sizing material are carried out
Before, cover half mould temperature is heated to 35 DEG C, and dynamic model mould temperature is heated to 30 DEG C, and to 120 DEG C, material temperature is 240 DEG C to heating tube heating-up temperature.Glue
Material injection formed product chamber is pierced into plastic melt, using 135 ± 2Ba pressed gas high pressure after Injection hold pressure terminates by air tube
Air blowing 1s, produces hollow structure and forms product air flue in plastic melt, promotes plastic melt full of formed product chamber and is overflowing
Flash is formed in hopper.Then air flue inner high voltage gas pressurize is carried out with 140 ± 2Ba pressure, the dwell time is 15 ± 1s.Air flue
Inner high voltage gas pressurize reduces gas pressure to 90 ± 2Ba after terminating, carry out normal pressure gas pressurize in air flue, and pressurize starts
Afterwards 1s, punctures cylinder action, drives lancet to puncture the air flue of flash in flash groove, and air flue is held while exhaust by punctured hole
Continuous to carry out pressurize with normal pressure gas, the normal pressure gas dwell time is 10 ± 1s in whole air flue, last gas supply
Close, gas pressurize terminates lancet homing, and gas aided injection mould is completed.Product is taken out after the completion of die sinking, its air flue cuts
Face reduces the wall thickness between air flue and Surface Appearance as shown in fig. 6, the section approximate with product external surfaces shape can be formed
Difference, and then eliminate the generation of bright print defect.
Claims (8)
1. in a kind of automotive upholstery gas-assisted injection molding process, including Injection hold pressure, high pressure blow-gas formation product air flue, air flue
Normal pressure gas pressurize in gases at high pressure pressurize, air flue, it is characterised in that：In Surface Appearance side during the Injection hold pressure
Mould in be equally spaced some heating tubes along product air flue axis, the heating tube axis is in Surface Appearance normal direction
Arrangement, before sizing material injection, the heating tube preheating temperature is the 1/2 of sizing material melt temperature, and the preheating temperature of the mould is 30
～35 DEG C.
2. automotive upholstery gas-assisted injection molding process according to claim 1, it is characterised in that：Between the heating tube
Away from for 20～25mm.
3. automotive upholstery gas-assisted injection molding process according to claim 1, it is characterised in that：It is normal in the air flue
Pressed gas pressurize punctures air flue and is exhausted after starting by lancet, continues with just while air flue is vented by punctured hole
Often pressed gas carry out pressurize.
4. automotive upholstery gas-assisted injection molding process according to claim 3, it is characterised in that：It is described when puncturing air flue
Air flue is punctured in product flash position.
5. automotive upholstery gas-assisted injection molding process according to claim 3, it is characterised in that：The air flue that punctures exists
The normal pressure gas pressurize starts to be carried out after 1s.
6. automotive upholstery gas-assisted injection molding process according to claim 1, it is characterised in that：During the high pressure blow-gas
135 ± 2Ba of gas pressure position, gassing time 1s.
7. automotive upholstery gas-assisted injection molding process according to claim 1, it is characterised in that：The air flue inner high voltage
140 ± 2Ba of gas pressure during gas pressurize, 15 ± 1s of dwell time.
8. automotive upholstery gas-assisted injection molding process according to claim 1, it is characterised in that：It is normal in the air flue
90 ± 2Ba of gas pressure during pressed gas pressurize, 10 ± 1s of dwell time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710001649.9A CN106608022A (en) | 2017-01-03 | 2017-01-03 | Gas-assisted injection molding process for automobile interior trim |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710001649.9A CN106608022A (en) | 2017-01-03 | 2017-01-03 | Gas-assisted injection molding process for automobile interior trim |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106608022A true CN106608022A (en) | 2017-05-03 |
Family
ID=58636937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710001649.9A Pending CN106608022A (en) | 2017-01-03 | 2017-01-03 | Gas-assisted injection molding process for automobile interior trim |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106608022A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107444291A (en) * | 2017-09-18 | 2017-12-08 | 长春汽富晟长泰汽车塑料制品有限公司 | Window trim strip and its processing method after full insertion gas spoke |
| CN108127866A (en) * | 2017-12-19 | 2018-06-08 | 长春富维安道拓汽车饰件系统有限公司 | The integrated auxiliary automobile door plate forming method with loudspeaker net pore structure of gas |
| CN114056254A (en) * | 2021-12-21 | 2022-02-18 | 上汽通用汽车有限公司 | Cladding decoration strip with multi-dimensional characteristics and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203254538U (en) * | 2013-03-25 | 2013-10-30 | 成都锦汇科技有限公司 | Rapid heating die |
| CN104908258A (en) * | 2015-06-24 | 2015-09-16 | 常熟市汽车饰件股份有限公司 | Long-air-passage air assisted injection molding process |
-
2017
- 2017-01-03 CN CN201710001649.9A patent/CN106608022A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203254538U (en) * | 2013-03-25 | 2013-10-30 | 成都锦汇科技有限公司 | Rapid heating die |
| CN104908258A (en) * | 2015-06-24 | 2015-09-16 | 常熟市汽车饰件股份有限公司 | Long-air-passage air assisted injection molding process |
Non-Patent Citations (1)
| Title |
|---|
| 郭建明，申开智: "《气体辅助注射成型制品常见缺陷及其改进措施》", 《现代塑料加工应用》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107444291A (en) * | 2017-09-18 | 2017-12-08 | 长春汽富晟长泰汽车塑料制品有限公司 | Window trim strip and its processing method after full insertion gas spoke |
| CN108127866A (en) * | 2017-12-19 | 2018-06-08 | 长春富维安道拓汽车饰件系统有限公司 | The integrated auxiliary automobile door plate forming method with loudspeaker net pore structure of gas |
| CN108127866B (en) * | 2017-12-19 | 2021-07-02 | 长春富维安道拓汽车饰件系统有限公司 | Automobile door plate forming method integrating air assistance and loudspeaker mesh structure |
| CN114056254A (en) * | 2021-12-21 | 2022-02-18 | 上汽通用汽车有限公司 | Cladding decoration strip with multi-dimensional characteristics and manufacturing method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170503 |