CN103692618A - Mold structure for polyimide material injection molding, and injection molding process - Google Patents
Mold structure for polyimide material injection molding, and injection molding process Download PDFInfo
- Publication number
- CN103692618A CN103692618A CN201310562751.8A CN201310562751A CN103692618A CN 103692618 A CN103692618 A CN 103692618A CN 201310562751 A CN201310562751 A CN 201310562751A CN 103692618 A CN103692618 A CN 103692618A
- Authority
- CN
- China
- Prior art keywords
- injection molding
- mold
- metal insert
- polyimide material
- product
- 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
- 239000000463 material Substances 0.000 title claims abstract description 45
- 239000004642 Polyimide Substances 0.000 title claims abstract description 24
- 238000001746 injection moulding Methods 0.000 title claims abstract description 24
- 229920001721 polyimide Polymers 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000000465 moulding Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000007822 coupling agent Substances 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 10
- 230000003746 surface roughness Effects 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000004576 sand Substances 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention provides a mold structure for polyimide material injection molding, and an injection molding process. According to the present invention, the designed mold is provided with a heating device and a thermal insulation layer so as to ensure thermal efficiency and mold temperature stability; the material adopted in the mold molding portion must select a material with a low high-temperature thermal expansion coefficient, and the molding portion material hardness is more than HRC55 so as to easily achieve smooth demolding of the product; the demolding inclination of the mold cavity is greater than 0.5 DEG so as to ensure smooth demolding of the product and no scratch on the surface; each position corresponding to the metal insert or the hole is provided with a gas exhaust groove so as to meet the purpose of weld line eliminating; when the large size product is provided with the metal insert, the metal insert must be subjected to a chemical corrosion treatment or surface sand blowing cleaning, and be coated with the high temperature coupling agent such as A-151 and the like; and after being processed, the product is required to directly enter an oven with a temperature of 200+/-5 DEG C to carry out a stabilization treatment so as to prevent product crack generation.
Description
Technical field
The invention belongs to Design of Dies and moulding process, be specifically related to a kind of polyimide material die for injection molding structure and injection molding technique.
Background technology
Owing to thering is very stable fragrant heterocycle structure in polyimide molecule, make it embody the incomparable excellent electrical insulating property of other macromolecular materials, wearability, high temperature resistance radiation and Physical Mechanical.Meanwhile, as the exsertile tip materials of a kind of property, polyimides has been widely used in the fields such as electromechanics, electric, instrument, petrochemical industry, metering, and becomes one of indispensable materials in hard-core technology field such as global rocket, aerospace.
Polyimides (PI) is heat-resistant polymer, 500 ℃ of energy short-terms, keeps main physical property, can be for a long time uses approaching under 300 ℃ of conditions.In resistant to elevated temperatures engineering plastics, it is one of kind of most worthy.
If this material adopts compression molding, multiple pressure is made section bar, and the method for rear employing machining guarantees shape of product and dimensional requirement; If employing injection moulding, need mould straight forming, but because this material flowability is poor, forming materials temperature is high, therefore its mold structure, molding and processing technology are different from general injection material, at this, with regard to this material injection mould structure design feature and moulding process, study.
Summary of the invention
The technical problem solving
For fear of the deficiencies in the prior art part, the present invention proposes a kind of polyimide material die for injection molding structure and injection molding technique.
Technical scheme
A polyimide material die for injection molding structure, is characterized in that: at mold cavity place, heating rod hole is set, hot pin is provided with heating rod in hole; Surrounding at mould is provided with thermal insulation layer; The draft angle of mold cavity is greater than 0.5 °; Enter cast gate and adopt direct feeding manner, the depth dimensions that enters cast gate need reach 2/3 of cast gate place wall thickness; Air discharge duct is offered in position in each corresponding metal insert or hole.
The material hardness of mould molding part is more than HRC55.
Mold core, mold cavity surface must carry out chromium plating processing.
Mold core, mold cavity surface roughness are Ra0.1.
The degree of depth minimum of described air discharge duct is 0.5mm.
When the plastics wall thickness around metal insert or hole is less than 1mm, increase herein wall thickness 2～3mm.
Adopt above-mentioned mould structure to carry out the injection molding technique of polyimide material, it is characterized in that step is as follows:
Step 1: material is dried to processing according to material drying process condition;
Step 2: metal insert is carried out to preheating, and preheat temperature is identical with mold temperature or higher than 10 ℃ of mold temperatures;
Step 3: mold heated temperature are controlled to 200～230 ℃, then inject polyimide material;
Step 4: the product after moulding is directly put into the baking oven of 200 ± 5 ℃, wait stablizing after the processing time finishes, cooling with case.
In step 2, as metal insert appearance and size > Φ 80 * 100, during plastics wall thickness≤2mm, before moulding, chemical attack processing or the processing of surperficial blast clean surface are carried out in the surface of metal insert and plastic bonding, then apply resistant to elevated temperatures coupling agent.
Described coupling agent is A-151.
In step 3, when goods appearance and size is greater than about Φ 60 * 80, and wall thickness is while being less than 2mm, and mold temperature need be brought up to 260 ℃.
Beneficial effect
A kind of polyimide material die for injection molding structure and injection molding technique that the present invention proposes, the mould of design arranges heater and thermal insulation layer, guarantees the stability of the thermal efficiency and mold temperature; Mould molding part material therefor must be selected the material that high temperature thermal coefficient of expansion is little, and moulding section material hardness need, more than HRC55, be convenient to the smooth demoulding of product; The draft angle of mold cavity should be greater than 0.5 °, and assurance product is deviate from smoothly, and does not pull on surface; Air discharge duct is offered in position in each corresponding metal insert or hole, meets the object of eliminating weld mark.When large product band metal insert, metal insert must carry out chemical attack processing or surperficial blast and clean, and is coated with high temperature coupling agent as A-151 etc.; In addition, after product processing, need directly to enter in 200 ± 5 ℃ of baking ovens and stablize processing, prevent that product from cracking.
Accompanying drawing explanation
The part overall schematic of Fig. 1: embodiment 1, the thin part L of wall is less than 1mm;
Fig. 2: to the thin part of part integral wall of embodiment 1, L increases by 2～3mm
Fig. 3: the local enlarged diagram that the thin part L of the part integral wall of embodiment 1 is increased to 2～3mm
The part overall schematic of Fig. 4: embodiment 2.
The specific embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Polyimide material die for injection molding structure for the embodiment of the present invention 1, is characterized in that: at mold cavity place, heating rod hole is set, hot pin is provided with heating rod in hole; Surrounding at mould is provided with thermal insulation layer; The heater that mould arranges, its heating power should be able to meet 260 ℃ of temperature requirements.With heating rod, heat to improve mold temperature.In order to guarantee the stability of the thermal efficiency and mold temperature, need to be at surrounding's increase thermal insulation layer of mould.
The draft angle of mold cavity is greater than 0.5 °, and to guarantee that product deviates from smoothly, does not pull on surface.
Enter cast gate and adopt direct feeding manner, the depth dimensions that enters cast gate need reach 2/3 of cast gate place wall thickness; Air discharge duct is offered in position in each corresponding metal insert or hole, and degree of depth minimum is 0.5mm.To guarantee product appearance quality and to melt commissure intensity.
Because the metal insert of the present embodiment or hole plastics wall thickness are around when thinner, as be less than 1mm, adopting increases air discharge duct and cannot meet the object of eliminating weld mark, need increase wall thickness 2～3mm being less than 1mm part, see Fig. 3.
The material hardness of mould molding part is more than HRC55, and mold core, mold cavity surface must carry out chromium plating processing, and mold core, mold cavity surface roughness are Ra0.1.Because this material, in forming process, polycondensation reaction can occur, there is low molecular weight volatile deposits yields, to mould, can cause corrosion, surface roughness is Ra0.1, is convenient to the smooth demoulding of product.
Adopt mould structure to carry out the injection molding technique of polyimide material, it is characterized in that step is as follows:
Step 1: material is dried to processing according to material drying process condition;
Step 2: metal insert is carried out to preheating, and preheat temperature is identical with mold temperature or higher than 10 ℃ of mold temperatures;
Step 3: mold heated temperature are controlled to 200～230 ℃, then inject polyimide material; When goods appearance and size is greater than about Φ 60 * 80, and wall thickness is while being less than 2mm, and mold temperature need be brought up to 260 ℃.
Step 4: the product after moulding is directly put into the baking oven of 200 ± 5 ℃, wait stablizing after the processing time finishes, cooling with case.
For the about Φ 80 * 100 of metal insert appearance and size >, during plastics wall thickness≤2mm, in order to guarantee the bonding of metal insert and plastics, the crackle that minimizing causes because of material after-contraction or come off, before moulding, need the surface of metal insert and plastic bonding to carry out chemical attack processing or the processing of surperficial blast clean surface, the resistant to elevated temperatures coupling agent of rear coating is as A-151.
Claims (10)
1. a polyimide material die for injection molding structure, is characterized in that: at mold cavity place, heating rod hole is set, hot pin is provided with heating rod in hole; Surrounding at mould is provided with thermal insulation layer; The draft angle of mold cavity is greater than 0.5 °; Enter cast gate and adopt direct feeding manner, the depth dimensions that enters cast gate need reach 2/3 of cast gate place wall thickness; Air discharge duct is offered in position in each corresponding metal insert or hole.
2. polyimide material die for injection molding structure according to claim 1, is characterized in that: the material hardness of mould molding part is more than HRC55.
3. according to polyimide material die for injection molding structure described in claim 1 or 2, it is characterized in that: mould molding inner surface must carry out chromium plating processing.
4. polyimide material die for injection molding structure according to claim 1, is characterized in that: the inside surface roughness of mould is Ra0.1.
5. polyimide material die for injection molding structure according to claim 1, is characterized in that: the degree of depth of described air discharge duct is minimum is 0.5mm.
6. polyimide material die for injection molding structure according to claim 1, is characterized in that: when metal insert or hole plastics wall thickness are around less than 1mm, increase herein wall thickness 2～3mm.
7. described in employing claim 1～6, any one mould structure carries out the injection molding technique of polyimide material, it is characterized in that step is as follows:
Step 1: material is dried to processing according to material drying process condition;
Step 2: metal insert is carried out to preheating, and preheat temperature is identical with mold temperature or higher than 10 ℃ of mold temperatures;
Step 3: mold heated temperature are controlled to 200～230 ℃, then inject polyimide material;
Step 4: the product after moulding is directly put into the baking oven of 200 ± 5 ℃, wait stablizing after the processing time finishes, cooling with case.
8. technique according to claim 7, it is characterized in that: in step 2, as metal insert appearance and size > Φ 80 * 100, during plastics wall thickness≤2mm, before moulding, chemical attack processing or the processing of surperficial blast clean surface are carried out in the surface of metal insert and plastic bonding, then apply resistant to elevated temperatures coupling agent.
9. technique according to claim 8, is characterized in that: described coupling agent is A-151.
10. technique according to claim 8, is characterized in that: in step 3, when goods appearance and size is greater than about Φ 60 * 80, and wall thickness is while being less than 2mm, and mold temperature need be brought up to 260 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310562751.8A CN103692618A (en) | 2013-11-12 | 2013-11-12 | Mold structure for polyimide material injection molding, and injection molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310562751.8A CN103692618A (en) | 2013-11-12 | 2013-11-12 | Mold structure for polyimide material injection molding, and injection molding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103692618A true CN103692618A (en) | 2014-04-02 |
Family
ID=50354363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310562751.8A Pending CN103692618A (en) | 2013-11-12 | 2013-11-12 | Mold structure for polyimide material injection molding, and injection molding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103692618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113320091A (en) * | 2021-05-31 | 2021-08-31 | 福建泉州市嘉隆模具有限公司 | Shoe mold convenient for demolding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5840504B2 (en) * | 1979-02-15 | 1983-09-06 | 旭化成株式会社 | Injection molding method |
| CN1154086A (en) * | 1994-06-22 | 1997-07-09 | 旭化成工业株式会社 | Delustered injection molded product of synthetic resin and molding method for the same |
| CN101249714A (en) * | 2008-04-02 | 2008-08-27 | 许南旭 | Instant heating/cooling device for injection mold and mold temperature control method thereof |
-
2013
- 2013-11-12 CN CN201310562751.8A patent/CN103692618A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5840504B2 (en) * | 1979-02-15 | 1983-09-06 | 旭化成株式会社 | Injection molding method |
| CN1154086A (en) * | 1994-06-22 | 1997-07-09 | 旭化成工业株式会社 | Delustered injection molded product of synthetic resin and molding method for the same |
| CN101249714A (en) * | 2008-04-02 | 2008-08-27 | 许南旭 | Instant heating/cooling device for injection mold and mold temperature control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王澜: "《高分子材料》", 31 January 2009, article "聚亚酰胺", pages: 179 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113320091A (en) * | 2021-05-31 | 2021-08-31 | 福建泉州市嘉隆模具有限公司 | Shoe mold convenient for demolding |
| CN113320091B (en) * | 2021-05-31 | 2023-08-22 | 福建泉州市嘉隆模具有限公司 | Shoe mold convenient for demolding |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104723510A (en) | Rapid heating-cycle molding set based on graphene coating | |
| CN103692618A (en) | Mold structure for polyimide material injection molding, and injection molding process | |
| CN113942172A (en) | Injection molding method of composite material | |
| CN201236196Y (en) | HDPE hollow wall winding tube external surface heat treating equipment | |
| CN111055465B (en) | Mold temperature and pressure control injection molding process and control system for highlight injection molding part | |
| CN209046907U (en) | A kind of liner of microwave-heating stove | |
| Murata et al. | Development of heating and cooling injection mold with far-infrared radiation heater | |
| CN101633767B (en) | Centrifugal manufacturing method of PFA inside lining and PFA inside lining steel pipe | |
| CN203994474U (en) | A kind of thermosetting die with heating plate | |
| CN107914373A (en) | A kind of lined with fluoroplastic valve hot-die Shooting Technique | |
| CN107139435A (en) | A kind of briquetting process of DMC composites | |
| CN102990881A (en) | Water-assisted injection molding process method | |
| CN105000870A (en) | Microwave drying method of corundum composite ceramic material | |
| CN104260288A (en) | Heat conduction copper-clad steel core for high glass fibers | |
| CN204894441U (en) | Hot mouth aluminium of hot runner mould cover heater | |
| CN204136342U (en) | A kind of high glass conduction copper Baogang fuse | |
| CN106273093B (en) | A kind of High Efficiency Thermal exchange molding die and its application method | |
| CN104320869A (en) | Paraboloid reflection type heating device | |
| CN204076731U (en) | Fan leaf electrical bar formula band cooling injection moulding patrix | |
| CN203957247U (en) | A kind of mould that is beneficial to rotomoulded articles moulding | |
| CN204136369U (en) | For the injection moulding patrix that the band of fan leaf cools | |
| CN211599787U (en) | Tooth mouth type self-carrying heat preservation type thin-wall stainless steel water pipe | |
| CN205871052U (en) | Abrasionproof decreases high rigidity formula injection mold | |
| CN106017083A (en) | Graphite crucible for solar metallurgy and solar metallurgical device | |
| CN2849629Y (en) | Internal heat type electro thermicpipe heat superconducting heat exchanger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140402 |