CN106003539A - Injection molding process for bulk molding compound (BMC) material - Google Patents
Injection molding process for bulk molding compound (BMC) material Download PDFInfo
- Publication number
- CN106003539A CN106003539A CN201610323761.XA CN201610323761A CN106003539A CN 106003539 A CN106003539 A CN 106003539A CN 201610323761 A CN201610323761 A CN 201610323761A CN 106003539 A CN106003539 A CN 106003539A
- Authority
- CN
- China
- Prior art keywords
- bmc
- river
- mouth
- product
- injection molding
- 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.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 18
- 239000004412 Bulk moulding compound Substances 0.000 title abstract description 30
- 239000000463 material Substances 0.000 title abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 23
- 238000005485 electric heating Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 4
- 229920003023 plastic Polymers 0.000 abstract description 4
- 238000010923 batch production Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 239000003086 colorant Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000005406 washing Methods 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- 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
-
- 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
- B29C45/38—Cutting-off equipment for sprues or ingates
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to an injection molding process for a bulk molding compound (BMC) material. The injection molding process is used for conducting injection molding on a high-quality rectangular thin-wall BM product. According to the injection molding process for the BMC material, a BMC raw material is pressurized into a feeding inlet through a threaded rod, led to a drainage opening through a runner and injected into an inner cavity of a mold, the drainage opening is formed in one end of a rectangular mold cavity, the thickness of the drainage opening is equal to that of the injection product, the width of the drainage opening is 0.7-1 time of the width of the injection product, and the position of an exhaust outlet of the mold cavity and the position of the drainage opening are symmetrical; and electric heating bodies are longitudinally and uniformly distributed in an upper mold body and a lower mold body and directly heat an upper mold and a lower mold to the temperature that the BMC material can be melted, so that the BMC raw material flows into the mold cavity through the drainage opening and flows towards the exhaust outlet to fill the mold cavity, and the BM product is formed in an injection molding mode. The injection molding process for the BMC material has the advantages that the problems of deformation, serious shrinkage, difficult exhaustion and the like of a plastic product which is slender, thin in wall and high in quality and appearance requirement are solved, drainage opening cutting of the BMC product is convenient, the production efficiency is improved, and factory batch production is better adapted.
Description
Technical field
The present invention relates to injection molding field, particularly relate to a kind of BMC notePenetrateMoulding technique.
Background technology
During the thermoplastic injection mo(u)ldings such as traditional PP, ABS, elongated running into, thin-walled, during the highest product of appearance requirement, often cannot solve elongated shape, the deformation of products that shrink material is caused, surface is shunk serious, and product is stranded the quality problems such as gas.Even and if increase follow-up setting tooling all be difficult to solve the problems referred to above.Thermoplastic material product product variable colors in use for some time such as the most traditional PP, ABS or fade.
BMC is i.e.: Bulk
Molding Compound bulk moulding material, is a kind of thermosetting plastics, is wherein mixed with various inert filler, fibre reinforced materials, catalyst, stabilizer and pigment, forms a kind of gluing " putty-like " composite for compression moulding or injection.According to different final applications, it is good that the composite of preparation is accurately controlled size, anti-flammability and tracking resistance, has the highest dielectric strength, corrosion resistance and resistance to soiling, and mechanical performance is remarkable, and contractility is low and color stability.BMC BMC) flow behavior and insulation and anti-flammability fabulous, various application accurate for details and dimensional requirement are the most applicable.Material has 75 kinds of colors available, can support by powder spraying or water paint.Mostly what the molding of industry BMC used is die cast, and it is also a big difficult point that product glue-feeder processes, and because its glue-feeder is more much larger than thermoplastic glue-feeders such as traditional PP, ABS, causes the product after production to be difficult to hands and breaks mouth of cutting off the water supply, it is necessary to by instruments such as saws.
Summary of the invention
It is an object of the invention to provide a kind of BMC injection molding technique, factory's batch production can be more suitable for, and elongated, the plastics product quality of thin-walled, high-quality apperance requirement can be promoted.
The technical solution of the present invention is to be formed the rectangle thin-walled BM product of high-quality apperance by injection molding manner, in upper mold, lower mold, cutting knife top board, mouth of a river ejector retainner plate, thimble, cutting knife, on the basis of electric heating element, being characterized in that BMC raw material enters charging aperture by screw pressurizing and is injected into dies cavity through the logical firmly mouth of a river of runner, the mouth of a river is arranged on one end of rectangle die cavity, and the thickness at the mouth of a river is the thickness of injecting products, width is the width of 0.7～1 times of injecting products, and the vent position of die cavity is symmetrical with the position at the mouth of a river；In the die body of upper die and lower die, longitudinal average mark is furnished with electric heating element, and upper die and lower die heating directly is reached to melt BMC by electric heating element, makes BMC raw material fill die cavity injection to the flowing of air vent direction in the mouth of a river flows into die cavity and forms BM product.
The above-described mouth of a river is arranged on the one end in rectangle cavity length direction, and cutting knife is arranged in lower mold and mouth of a river position corresponding, first ejects cutting knife when cutting knife top board ejects, and cutting knife is spacing after being cut off at the mouth of a river no longer to be raised, back center product is ejected.
The present invention be directed to the process that BMC injection mo(u)lding provides, reduce product washing shrinkage, mould inner nozzle cutting-off method, length direction arranges big glue-feeder, length direction is not disconnected arranges exhaust position, reach to improve elongated, thin-walled, the plastic product deformation of high-quality apperance requirement, the problem such as the serious and exhaust problem of shrinking, facilitate BMC water port of product to cut off.
The invention have the advantage that the plastic product deformation solving elongated, thin-walled, high-quality apperance requirement, the problem such as the serious and exhaust problem of shrinking, facilitate BMC water port of product to cut off, injection molding technique raising production efficiency is more suitable for factory and produces in batches.
Accompanying drawing explanation
Fig. 1 is the injection structure schematic diagram of the present invention；
Fig. 2 is the injection structure decomposing schematic representation of the present invention.
Detailed description of the invention
Embodiment 1
According to Fig. 1, shown in Fig. 2, the present invention is to be formed the rectangle thin-walled BM product 001 of high-quality apperance by injection molding manner, in upper mold 002, lower mold 004, cutting knife top board 005, mouth of a river ejector retainner plate 006, thimble 007, cutting knife 008, on the basis of electric heating element 011, it is characterized in that BMC raw material enters charging aperture 003 by screw pressurizing and is injected into dies cavity through logical firmly product glue-feeder 010 water inlet 009 of runner, one end being arranged on upper mold 002 rectangle die cavity, 009, the mouth of a river, the thickness at the mouth of a river 009 is the thickness of injecting products, width is the width of 0.7 times of injecting products, air vent 012 position of die cavity is symmetrical with the position at the mouth of a river 009；In the die body of upper mold 002 and lower mold 004, longitudinal average mark is furnished with electric heating element 011, electric heating element 011 directly reaches thawing BMC to upper mold 002 and lower mold 004 heating, makes BMC raw material fill die cavity to the flowing of air vent direction in the mouth of a river flows into die cavity and is molded formation BM product 001.The described mouth of a river 009 is arranged on the one end in rectangle cavity length direction, cutting knife 008 is arranged in lower mold 004 and the mouth of a river 009 position corresponding, first ejecting cutting knife 008 when cutting knife top board 005 ejects, cutting knife 008 is spacing after being cut off at the mouth of a river 009 no longer to be raised, back center 007 product is ejected.
Original product uses PP material injection molding, but is because thin-walled, elongated shape, deforms very serious, and rigidity is inadequate after formed product, and surface is also unable to reach high light requirement.Use BMC die cast, still result in surface and be unable to reach high light requirement, and mouth of a river cut-out efficiency is the lowest.Use BMC injection molding technique, and use mould inner nozzle shearing device, make product reach rigidity, flatness and surface height light requirement, and disposably solve water dividing gap problem, be greatly improved product quality and production efficiency.
BMC raw material enters charging aperture 003 by screw pressurizing injection and arrives mould product inner chamber, is directly heated mould by electric heating element 011, makes product 001 reach to melt and molding purpose.After reaching the molding time, cutting knife top board 005 jack-up, the mouth of a river cut off by cutting knife 008 by force, and upper mould 003 is opened subsequently, and cutting knife top board 005, again by mouth of a river ejector retainner plate 006 jack-up, by the mouth of a river 009 ejection die, takes off product 001 by hand.
For solving product flatness and high finish surface effect, die cavity must polish, and the mouth of a river 009 i.e. product enters glue point position and is necessarily placed at length direction one end, for solving tired gas and improving surface quality, it is necessary to air vent 012 position to be arranged on the other end in product length direction.
Embodiment 2
With embodiment 1, its different place is: position, the mouth of a river is arranged on one end of rectangle die cavity, and the thickness at the mouth of a river is the thickness of injecting products, and width is the width of 0.85 times of injecting products.
Embodiment 3
With embodiment 1, its different place is: position, the mouth of a river is arranged on one end of rectangle die cavity, and the thickness at the mouth of a river is the thickness of injecting products, and width is the width of 1 times of injecting products.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (2)
1. a BMC injection molding technique, it is the rectangle thin-walled BM product being formed high-quality apperance by injection molding manner, including upper mold, lower mold, cutting knife top board, mouth of a river ejector retainner plate, thimble, cutting knife, electric heating element, it is characterized in that BMC raw material enters charging aperture by screw pressurizing and is injected into dies cavity through the logical firmly mouth of a river of runner, the mouth of a river is arranged on one end of rectangle die cavity, the thickness at the mouth of a river is the thickness of injecting products, and width is the width of 0.7～1 times of injecting products, and the vent position of die cavity is symmetrical with the position at the mouth of a river；In the die body of upper die and lower die, longitudinal average mark is furnished with electric heating element, and upper die and lower die heating directly is reached to melt BMC by electric heating element, makes BMC raw material fill die cavity injection to the flowing of air vent direction in the mouth of a river flows into die cavity and forms BM product.
A kind of BMC injection molding technique, it is characterized in that the described mouth of a river is arranged on the one end in rectangle cavity length direction, cutting knife is arranged in lower mold and mouth of a river position corresponding, cutting knife is first ejected when cutting knife top board ejects, cutting knife spacing no longer raises after being cut off at the mouth of a river, back center product is ejected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323761.XA CN106003539B (en) | 2016-05-17 | 2016-05-17 | A kind of BMC injection molding technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323761.XA CN106003539B (en) | 2016-05-17 | 2016-05-17 | A kind of BMC injection molding technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106003539A true CN106003539A (en) | 2016-10-12 |
| CN106003539B CN106003539B (en) | 2018-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610323761.XA Active CN106003539B (en) | 2016-05-17 | 2016-05-17 | A kind of BMC injection molding technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106003539B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846680B (en) * | 2021-02-20 | 2023-08-29 | 洛阳佳会机械科技有限公司 | Manufacturing method of foam plastic molding variable multipurpose mold and foam plastic molding process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040035657A1 (en) * | 2000-09-29 | 2004-02-26 | Gerd Ehnert | Method for producing ceramic brake disks from bmc |
| CN203460393U (en) * | 2013-06-19 | 2014-03-05 | 深圳康佳精密模具制造有限公司 | High-gloss injection forming mold |
| CN204249260U (en) * | 2014-11-15 | 2015-04-08 | 江苏星科精密模具有限公司 | With the BMC reflector mould of vacuum device |
| CN205112276U (en) * | 2015-08-14 | 2016-03-30 | 航天材料及工艺研究所 | Thin -walled special -shaped piece's injection moulding mould |
-
2016
- 2016-05-17 CN CN201610323761.XA patent/CN106003539B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040035657A1 (en) * | 2000-09-29 | 2004-02-26 | Gerd Ehnert | Method for producing ceramic brake disks from bmc |
| CN203460393U (en) * | 2013-06-19 | 2014-03-05 | 深圳康佳精密模具制造有限公司 | High-gloss injection forming mold |
| CN204249260U (en) * | 2014-11-15 | 2015-04-08 | 江苏星科精密模具有限公司 | With the BMC reflector mould of vacuum device |
| CN205112276U (en) * | 2015-08-14 | 2016-03-30 | 航天材料及工艺研究所 | Thin -walled special -shaped piece's injection moulding mould |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846680B (en) * | 2021-02-20 | 2023-08-29 | 洛阳佳会机械科技有限公司 | Manufacturing method of foam plastic molding variable multipurpose mold and foam plastic molding process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106003539B (en) | 2018-02-09 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 528308 No.15, Shilong Road, committee of Yange village, Lunjiao, Shunde District, Foshan City, Guangdong Province Patentee after: GUANGDONG SAIPU APPLIANCES MANUFACTURING Co.,Ltd. Address before: 528300, No. 12 South Road, Huang Yong Industrial Zone, Beijiao Town, Shunde District, Guangdong, Foshan Patentee before: GUANGDONG SAIPU APPLIANCES MANUFACTURING Co.,Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CP03 | Change of name, title or address |
Address after: No. 2 Diamond Road, Yang'e Village, Lunjiao Street, Shunde District, Foshan City, Guangdong Province 528308 Patentee after: Guangdong Saipu Intelligent Manufacturing Co.,Ltd. Country or region after: China Address before: No. 15, Shilong Road, Lunjiao Yange village committee, Shunde District, Foshan City, Guangdong Province, 528308 Patentee before: GUANGDONG SAIPU APPLIANCES MANUFACTURING CO.,LTD. Country or region before: China |
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| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240826 Address after: 528000 No. 1, Songhua Road, Textile Industry Base, Xiqiao Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Jinli Electric Appliance Manufacturing Co.,Ltd. Country or region after: China Address before: No. 2 Diamond Road, Yang'e Village, Lunjiao Street, Shunde District, Foshan City, Guangdong Province 528308 Patentee before: Guangdong Saipu Intelligent Manufacturing Co.,Ltd. Country or region before: China |
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| TR01 | Transfer of patent right |