CN106003539B - A kind of BMC injection molding technique - Google Patents
A kind of BMC injection molding technique Download PDFInfo
- Publication number
- CN106003539B CN106003539B CN201610323761.XA CN201610323761A CN106003539B CN 106003539 B CN106003539 B CN 106003539B CN 201610323761 A CN201610323761 A CN 201610323761A CN 106003539 B CN106003539 B CN 106003539B
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- CN
- China
- Prior art keywords
- river
- mouth
- bmc
- die
- cutting knife
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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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
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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
- B29C45/17—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
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- 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 present invention relates to a kind of BMC injection molding technique, for being molded the rectangle thin-walled BM products of high-quality apperance, it disclose BMC raw material by screw pressurizing enter charging aperture through runner it is logical live the mouth of a river be injected into dies cavity, 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, width is the width of 0.7~1 times of injecting products, and the vent position of die cavity and the position at the mouth of a river are symmetrical；Longitudinal average mark is furnished with electric heating element in the die body of upper die and lower die, and electric heating element directly reaches thawing BMC to upper die and lower die heating, BMC raw material is flowed into through the mouth of a river in die cavity and is molded to form BM products to exhaust outlet direction flowing filling die cavity.It is an advantage of the invention that：Solve elongated, thin-walled, the plastic product deformation of high-quality apperance requirement, shrink seriously and the problems such as exhaust problem, facilitate BMC water port of product to cut off, injection molding technique, which improves production efficiency and is more suitable for factory, to be produced in batches.
Description
Technical field
The present invention relates to injection molding field, more particularly to a kind of BMC injection molding techniques method.
Background technology
During the thermoplastic injection molding such as traditional PP, ABS, thin-walled elongated running into, appearance requirement is very high
During product, can not often solve elongated shape, the deformation of products caused by shrink material, surface is shunk seriously, and product is stranded
The quality problems such as gas.And all it is difficult to solve the above problems even if increasing follow-up setting tooling.Traditional heat such as PP, ABS in addition
The product discoloration in use for some time of plastic material product is faded.
BMC is：Bulk Molding Compound bulk moulding materials, are a kind of thermosetting plasticses, wherein mixing
Various inert fillers, fibre reinforced materials, catalyst, stabilizer and pigment, formed a kind of for the gluing of compression moulding or injection
" putty-like " composite.According to different final application fields, the composite of preparation accurately controls size, anti-flammability and
Tracking resistance is good, has very high dielectric strength, corrosion resistance and a resistance to soiling, and mechanical performance is remarkable, and shrinkage is low and color and luster
It is stable.BMC BMC) flow behavior and insulation and anti-flammability it is fabulous, it is accurate various for details and size requirement
Using very applicable.Material has that 75 kinds of colors are available, can support by pulvis spraying or water paint.Industry BMC shapings use
It is mostly be die cast, the processing of product glue-feeder and a big difficult point, because its glue-feeder is than thermoplastics such as traditional PP, ABS
Glue-feeder is much larger, causes the product after production to be difficult to break mouth of cutting off the water supply with hand, it is necessary to by instruments such as saws.
The content of the invention
It is an object of the invention to provide a kind of BMC injection molding techniques, can be more suitable for factory's batch production, and can be lifted
Elongated, thin-walled, the plastics product quality of high-quality apperance requirement.
The technical solution of the present invention is that the rectangle thin-walled BMC products of high-quality apperance are formed by injection molding manner,
In upper mould, lower mould, cutting knife top plate, mouth of a river ejector retainner plate, thimble, cutting knife, on the basis of electric heating element, it is characterized in that BMC raw material lead to
Cross screw pressurizing enter charging aperture through runner it is logical live the mouth of a river be injected into dies cavity, the mouth of a river is arranged on one end of rectangle die cavity, water
The thickness of mouth is the thickness of injecting products, and width is the width of 0.7~1 times of injecting products, the vent position of die cavity and the mouth of a river
Position it is symmetrical；Longitudinal average mark is furnished with electric heating element in the die body of upper die and lower die, and electric heating element is directly to upper die and lower die
Heating reaches thawing BMC, BMC raw material is flowed into through the mouth of a river in die cavity and flows filling die cavity injection shape to exhaust outlet direction
Into BMC products.
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 mould and mouth of a river position
Put corresponding position, cutting knife top plate first ejects cutting knife when ejecting, and cutting knife is spacing after the mouth of a river is cut off no longer to be raised, back center
Product is ejected.
The present invention be directed to the process that BMC injection molding provides, and reduces product washing shrinkage, mould inner nozzle is cut
Disconnected method, length direction set big glue-feeder, and length direction latter end sets exhaust position, and reaching improves elongated, thin-walled, high-quality
The plastic product deformation of apperance requirement, shrinks seriously and the problems such as exhaust problem, facilitates the cut-out of BMC water port of product.
It is an advantage of the invention that：Solve elongated, thin-walled, high-quality apperance requirement plastic product deformation, shrink seriously and
The problems such as exhaust problem, BMC water port of product is facilitated to cut off, injection molding technique improves production efficiency and is more suitable for factory's batch life
Production.
Brief description of the drawings
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.
Embodiment
Embodiment 1
According to Fig. 1, Fig. 2, the present invention is that the rectangle thin-walled BMC products of high-quality apperance are formed by injection molding manner
001, in upper mould 002, lower mould 004, cutting knife top plate 005, mouth of a river ejector retainner plate 006, thimble 007, cutting knife 008, the base of electric heating element 011
On plinth, it is characterized in that BMC raw material enter charging aperture 003 through the logical firmly water inlet 009 of product glue-feeder 010 of runner by screw pressurizing
Dies cavity is injected into, 009, the mouth of a river is arranged on one end of the rectangle die cavity of mould 002, and the thickness at the mouth of a river 009 is injecting products
Thickness, width is the width of 0.7 times of injecting products, and the position of the position of exhaust outlet 012 and the mouth of a river 009 of die cavity is symmetrical；
Longitudinal average mark is furnished with electric heating element 011 in the die body of upper mould 002 and lower mould 004, and electric heating element 011 is directly to upper mould 002 and lower mould
004 heating reaches thawing BMC, BMC raw material is flowed into through the mouth of a river in die cavity and flows filling die cavity note to exhaust outlet direction
It is moulding into BMC products 001.The described mouth of a river 009 is arranged on the one end in rectangle cavity length direction, and cutting knife 008 is arranged on down
Cutting knife 008 is first ejected when ejecting with the position corresponding of the mouth of a river 009, cutting knife top plate 005 in mould 004, and cutting knife 008 is by the mouth of a river
009 cut-out after it is spacing no longer raise, back center 007 product is ejected.
Original product is molded using PP material injections, but because thin-walled, elongated shape, is deformed after formed product very tight
Weight, and it is rigid inadequate, and surface is also unable to reach bloom requirement.Using BMC die cast, still resulting in surface can not
Reach bloom requirement, and mouth of a river cut-out efficiency is very low.Using BMC injection molding technique, and using mould inner nozzle
Shearing device, product has been reached rigidity, flatness and the requirement of surface bloom, and disposably solve the problems, such as water dividing gap, significantly
Improve product quality and production efficiency.
BMC raw material are injected into charging aperture 003 by screw pressurizing and arrive mould product inner chamber, straight by electric heating element 011
Connect and mould is heated, product 001 is reached thawing and shaping purpose.After reaching the molding time, cutting knife top plate 005 jacks up,
Cutting knife 008 by force cuts the mouth of a river, and subsequent upper mould 003 is opened, and cutting knife top plate 005 again jacks up mouth of a river ejector retainner plate 006, will
The ejection die of the mouth of a river 009, removes product 001 by hand.
It must be polished to solve product flatness and high finish surface effect, die cavity, and the mouth of a river 009 is that product enters glue point position
Put and be necessarily placed at length direction one end, to solve trapped gas and improving surface quality, it is necessary to which the position of exhaust outlet 012 is arranged on into production
The other end of product length direction.
Embodiment 2
With embodiment 1, its different place is：Mouth of a river position is arranged on one end of rectangle die cavity, and the thickness at the mouth of a river is note
The thickness of molding product, width are the width of 0.85 times of injecting products.
Embodiment 3
With embodiment 1, its different place is：Mouth of a river position is arranged on one end of rectangle die cavity, and the thickness at the mouth of a river is note
The thickness of molding product, width are the width of 1 times of injecting products.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (2)
1. a kind of BMC injection molding technique, it includes upper mould, lower mould, cutting knife top plate, mouth of a river ejector retainner plate, thimble, cutting knife,
Electric heating element, it is characterized in that BMC raw material enter charging aperture by screw pressurizing is injected into dies cavity, the mouth of a river through the logical firmly mouth of a river of runner
One end of rectangle die cavity is arranged on, 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
Degree, the vent position of die cavity and the position at the mouth of a river are symmetrical；Mould inner nozzle cutting-off method, length direction set big glue-feeder,
Length direction latter end sets exhaust position；Longitudinal average mark is furnished with electric heating element in the die body of upper die and lower die, and electric heating element is direct
Thawing BMC is reached to upper die and lower die heating, BMC raw material is flowed into through the mouth of a river in die cavity and is filled out to the flowing of exhaust outlet direction
Mold filling chamber is molded to form BMC products.
A kind of 2. BMC injection molding technique according to claim 1, it is characterized in that the described mouth of a river is arranged on rectangle
The one end in cavity length direction, cutting knife is arranged in lower mould first to be pushed up with mouth of a river position corresponding, cutting knife top plate when ejecting
Go out cutting knife, cutting knife is spacing after the mouth of a river is cut off no longer to be raised, 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 CN106003539A (en) | 2016-10-12 |
| CN106003539B true CN106003539B (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610323761.XA Active CN106003539B (en) | 2016-05-17 | 2016-05-17 | A kind of BMC injection molding technique |
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| CN (1) | CN106003539B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ295450B6 (en) * | 2000-09-29 | 2005-08-17 | Menzolit Fibron Gmbh | Process 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 |
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| Publication number | Publication date |
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| CN106003539A (en) | 2016-10-12 |
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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. |