CN110341112A - Plastic cement transfer molding equipment and forming method - Google Patents
Plastic cement transfer molding equipment and forming method Download PDFInfo
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- CN110341112A CN110341112A CN201910561312.2A CN201910561312A CN110341112A CN 110341112 A CN110341112 A CN 110341112A CN 201910561312 A CN201910561312 A CN 201910561312A CN 110341112 A CN110341112 A CN 110341112A
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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
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
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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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/62—Barrels or cylinders
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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
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
- B29C2045/0008—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements the fibres being oriented randomly
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2071/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to plastic cement transfer molding equipment and forming methods, especially it is used for the molding equipment of special engineering plastics, the transfer molding molding equipment, including general control system, charging system, double screw extruder, storage tank, storage tank pressure injection system, press, mold platform, platform courses oil cylinder and mold；Double screw extruder one end is connect with charging system, and the other end is connect with storage tank, and installation mold, storage tank are fixed on cross-head position in mold platform below the storage tank pressure injection system.The present invention, it can be achieved that continuous production, and can adapt to the production of different size, kind by the combinations of various equipment；By the linkage control of control system, thick-walled product molding cycle is effectively reduced, quickly prepares the thick-walled product etc. of thickness 20-120mm.The problems such as prepared thick-walled product pore-free, shrinkage porosite.
Description
Technical field
The present invention relates to plastic molding equipment and forming method, especially a kind of transfer molding molding equipment and molding side
Method.
Background technique
The special engineering plastics conventional moulded forming methods such as similar PEEK, molding cycle is long, low efficiency；Injection molding is set
Standby limitation, cannot prepare heavy section casting product, even if injection molding thick-walled product, the defects of stomata, shrinkage porosite also easily occurs, influencing product makes
With requiring.
In the prior art, application No. is 200910247667.0 Chinese invention patent applications to disclose a kind of low-density tree
Rouge Transfer molding technique and its equipment that forms a complete production network, low-density resin transfer moulding process, first manufacture maceration extract,
It further include following steps；1) when stirring maceration extract, the foamed material substance that can be expanded rapidly after being heated is added, is uniformly mixed
Afterwards, spontaneous bubble maceration extract is formed；2) preforming fibre reinforced materials base is placed in mold；3) air in mold is extracted out；4)
By implanter, spontaneous bubble maceration extract is injected into mold；5) mold is heated, curing molding；6) mold is carried out
It is quickly cooled down；7) it demoulds, takes out product, clear up mold.Low-density resin transfer forming production device, including implanter,
Mold further includes the hybrid system for mixed foaming material and maceration extract, further includes one for providing foamed material substance hair
The temperature control system of the temperature environment of bubble.Application No. is 201110412331.2 Chinese invention patent applications to disclose one kind
Resin transfering moulding formation device and forming method, described device include: heating bucket, raw cylinder, servo electric jar, static mixing
Device, valve, temperature sensor, control system, wherein the heating bucket is connect with the raw cylinder；The servo electric jar and institute
State raw cylinder connection；The control system is connect with the heating bucket, the servo electric jar, the valve；The heating bucket, original
Material cylinder, servo electric jar, valve, temperature sensor form injecting unit；The control system controls the valve, the servo-electric
Cylinder, so that plurality of raw materials is mixed by multiple injecting units into the static mixer, it is compound needed for obtaining after cooling
Material.A kind of Transfer molding method is disclosed application No. is 201310101534.9 Chinese invention patent application and is set
It is standby.Plastics melt is directly squeezed into storage using extruder heating according to fusible plastic properties by the Transfer molding method
Material cylinder heat preservation, concrete technology flow process include: that ready plastic raw materials are heated extrusion plasticizing using extruder and melt plastics
Body directly squeezes into material storage jar heat preservation；After ready mold is put into baking oven heating, heat preservation, it is transferred to pressure injection position；Pass through pressure injection
System carries out mode locking, pressure injection and pressure maintaining；Product is taken out to the cooling mould that retreats of pressure maintaining, is put in storage after examining.The above-mentioned prior art,
It can be further improved.
Injection molding-compression forming is fused materials to be injected into, in mold filling mistake in the biggish die space of preparatory compression travel
In journey or mold filling complete when die closing, compressed with clamp force.This method is by mode locking power limit, although method is simple, Jin Jinshi
For the composite molding plastic products of the embedding lining fitting of the biggish thin-walled plastic product of projected area and skin material, thickness cannot be prepared
Wall product.
Summary of the invention
In order to solve the above-mentioned technical problem, primary and foremost purpose of the present invention is to provide a kind of plastic cement transfer molding equipment, especially
For the molding equipment of special engineering plastics, the transfer molding molding equipment, including general control system, charging system, double spiral shells
Bar extruder, storage tank pressure injection system, storage tank, mold platform, platform courses oil cylinder and press；General control system and charging are
System connection, double screw extruder one end are connect with charging system, and the other end is connect with storage tank, and storage tank is fixed on extruder machine
Head position, is equipped with mold platform between the storage tank and press, platform courses oil cylinder is equipped with below mold platform, in storing
Installation mold in mold platform below tank.
Screw rod and gun barrel in transfer molding equipment of the present invention in double screw extruder use A grades of bimetallic alloy materials,
Storage tank discharge port nozzle can use various sizes of nozzle according to the difference of product glue consumption.Present invention is mainly used for polyarylethers
The processing of the special engineering plastics such as ketone, hot properties and fibre-adding modified characteristic due to special engineering plastics have abrasion to screw rod,
Therefore A grades of bimetallic alloy materials should be selected.Double screw extruder technical requirements and structural parameters determine according to actual needs.It is described
A grade dual alloy material (nickel, chromium, carbon tungsten, cobalt) containing tungsten carbide content 25%, 550 degree of high temperature resistant hereinafter, screw rod integral spray close
58 ° -60 ° of golden thickness 1.5-1.8mm, integral hardness HRC, 0.4 μm of surface roughness Ra.
Further, far-infrared heater is equipped with inside double screw extruder, the heating method of double screw extruder is adopted
With heating method inside far infrared, far infrared has certain penetration capacity, so that the inside of material and surface molecular are simultaneously
Radiation energy is absorbed, heating effect is produced from.Internal heating method, heating speed is fast, saves the energy.With traditional ceramic heat
Circle heating method is compared, and 30% is improved in production efficiency, economize on electricity 30%.It does not pollute the environment, electrothermal quartz tube safety
Height is small to human injury.
The characteristics of storage tank pressure injection system is to use bolt in the surrounding for being located at mold below storage tank pressure injection system
Confine, is an obturator in addition to cast gate.Which can simplify clamping system, and storage tank pressure injection system of the present invention uses oil pressure
Mode pressurize, by general control system control pressurize, can determine according to actual needs needed for pressurization numerical value.
The press is with the characteristics of mold platform: the mold that pressure injection is completed is moved on press by mold platform to carry out
Pressurization carries out later period sizing, provides power by platform courses oil cylinder, keeps mold platform mobile.
The characteristics of mold heating system is: mold requires heat to melt temperature, finally to pressurize, so that molding
Product does not have stomata or shrinkage porosite.Mold uses newest low frequency induction heating method in the present invention, can be carried out according to die size
Heating tube size dimension is designed, arranges that copper pipe is powered inside and outside mold, mold is quickly heated, substantially reduces molding week
Phase.
The structure of storage tank pressure injection system is all very crucial to entire design and processes effect.It should store twin-screw and squeeze
Out machine squeeze out melt and kept the temperature, it is necessary to can high-temperature condition guarantee leakproofness.The storage tank that the present invention uses
Material is ductile cast iron material, and deformation is minimum in the case of a high temperature, guarantees to be not in flash situation when injecting pressurized melt.
When high pressure is injected, there is counter-pressure to screw rod in plastic melt in order to prevent, in double screw extruder head and storage tank connection position
It sets and hydraulic control valve is installed.To the pressure of screw rod when avoiding pressure injection.After guaranteeing injection pressure, twin-screw extrusion function is negative without external force
Lotus is well on starting.
Transfer molding molding equipment of the invention can be used for forming 10-120mm thick-walled product, product be not in stomata,
The defects of shrinkage porosite.
Present invention simultaneously provides a kind of transfer molding molding equipment and forming methods, can be by utilizing existing simple general-purpose
The problems such as equipment, solution thick-walled product one-pass molding and stomata shrinkage porosite.
The transfer molding forming method is changed according to special engineering plastics shaping characteristic using double screw extruder preparation
Property composite material and plastics melt is expressed into storage tank progress short time heat preservation, then plastics melt high pressure is injected into improvement
Molding die in, carry out the cooling and shaping of press secondary pressurized；Concrete technology flow process includes:
(1) ready special engineering plastics raw material, reinforcing agent etc. are subjected to high-speed mixer blending, it is spare；
(2) start double screw extruder, mixed material is added, melt blending squeezes out, can add in the side on extruder wall cylinder
Long fibre is added in fine mouth；
(3) mixed material squeezed out is expressed into the storage tank connecting with head, is kept the temperature；
(4) while extruder heats up, applicable mold is heated using low frequency induction, is carried out after reaching required temperature
Keep the temperature half an hour；Further, low frequency induction heating setpoint parameter area is 17-19HZ, heating temperature range 300-395
℃。
(5) mold is confined by bolt, be fixed；
(6) it being molded by pressure injection system, after the completion of injection molding, mold is moved quickly on press by mold platform,
Secondary pressurized is carried out to mold, recompresses material.
(7) pressure maintaining is carried out to mold to cool, reach suitable calcining temperature, generally 220 DEG C hereinafter, taken off
Mould.
Above-mentioned special engineering plastics raw material may be selected thermoplastic special engineering plastic in it is any one or several, as PPS,
PPSU, PES, PEI, PEEK or PEEK/PEI alloy, PEEK/PPS alloy etc..Carbon black etc. may be selected in reinforcing agent.
In the methods described above, the heating method of the double screw extruder uses Far-infrared Heating, and extruder temperature is set
Fixed to divide four sections of controls by extruder structure, preferred 300-320 DEG C of first segment, preferred 320-340 DEG C of second segment, third section is preferred
340-360 DEG C, the 4th section preferably 360-390 DEG C.
The transfer molding technique includes extruder and the setting of storage tank temperature, the setting of extruder screw speed, storage tank
Pressure injection default, press pressure setting, the control of material utilization amount automatic gauge.Preferred 375-390 DEG C of the storage tank temperature,
Preferred 370-390 DEG C of mold temperature.The transfer molding technique, the preferred 30-180r/min of screw extruder screw speed,
Charging system speed sets preferred 3-7r/min, the preferred 3-12MPa of storage tank pressure injection system pressure, and press pressure sets 5-
25Mpa, preferably 5-20MPa.Cooling velocity general control is in 2-5 DEG C/min.
In above-mentioned transfer molding moulding process, equipment is determined according to the viscosity of raw material, thermal stability and forming temperature
Processing temperature, viscosity is bigger, and temperature is higher；The material of stability difference, temperature are generally all lower.Viscosity is bigger, Pressure Casting and
Press moulding pressure is higher, and thermal coefficient lower material is longer cooling time.It is selected according to product structure and material utilization amount
Material mouth and setting Pressure Casting, press moulding pressure, cooling time.After formula for raw stock confirmation, analyzing influence transfer molding is answered
The factor of processing and forming: the 1. mobility of material, thermal stability, thermal decomposition temperature select correct processing temperature range；2. root
According to article construction form and size, reasonable Pressure Casting and moulding pressure, injecting glue amount and cooling time are set；3. according to product
Structure and size, design mould structure, the type of cooling and cooling velocity；4. determines according to actual conditions double screw extruder and feed
The technological parameters such as speed are added in material machine, fiber.
There are many molding product specifications type of transfer molding, and pressure injection amount is of different sizes, bring many difficulties to machine-shaping,
The present invention is solved using following methods:
1. the problem of stomata occurs in heavy wall interiors of products, transfer molding forms, heavy wall similar with traditional injection moulding moulding process
The king-sized composite material of stomata etc., especially viscosity is also easy to produce inside product.Solution be exactly by adjusting mold temperature,
Pressure injection speed improves material flowability, increases pressure, improves product compactness etc., and especially final step press progress is secondary
Pressurization, different from the one-time formed method of traditional injection moulding pressure maintaining, this method is pressurizeed in heating, by injection molding and compression molding
Collaboration uses, and solves injection molding heavy section casting and the problems such as stomata, shrinkage porosite occurs, guarantees the compactness of product.
2. the processing of thick-walled product problem of Cracking.Hypocrystalline special engineering plastics product is in forming process, often slightly
Careless then easy generation product cracking and other issues, solution: 1. controlling cooling velocity and cooling time, reduces product and sends out
Raw stress concentration phenomenon.2. evading the structures such as right angle in die design process as far as possible, increase transition.3. after being carried out to heavy wall product
Internal stress is eliminated in processing, can get without cracking product.
The present invention passes through extruder extrusion plastic melt into storage tank, by storage tank pressure injection system pressure injection to mold
In, it can be achieved that continuously run, adapt to the production of different product, significantly improve compression molding efficiency so that compression molding realize from
It is dynamic to be turned into industry.
The present invention is kneaded material, is obtained composite material raw material, passed through by high speed blender double screw extruder
Side feed inlet be added fiber, carry out enhancing modification, by the method for pressure injection by material injection into mold, and by press into
Then row secondary pressurized is cooled down to the briquetting pressure of plasthetics, can be readily available thick-walled product, product is through examining
It tests, the defects of pore-free, shrinkage porosite.
Compared with prior art, fusion plastification blending effectively can be carried out to mixed material by double screw extruder, also
Fibrous material can be added from side spout, to enhance material；By the combination of various equipment, it can be achieved that continuous
Metaplasia produces, and can adapt to the production of different size, kind；By the linkage control of control system, thickness is effectively reduced
The wall product molding period quickly prepares the thick-walled product etc. of thickness 20-120mm.Prepared thick-walled product pore-free, shrinkage porosite etc.
Problem.The temperature-fall period that is rapidly heated may be implemented using induction heating and infrared heating in the present invention, greatly shortens plastic cement system
The molding cycle of product；And by secondary pressurized, compressing force needed for reaching product molding, moulded products are closely knit, and performance is good.
Detailed description of the invention
Fig. 1 is forming method flow chart of the present invention；
Fig. 2 is apparatus of the present invention structure chart.Wherein, 1, general control system, 2, charging system, 3, double screw extruder, 4,
Hydraulic control valve, 5, storage tank pressure injection system, 6, storage tank, 7, mold, 8, mold platform, 9, platform courses oil cylinder, 10, pressure
Machine.
Fig. 3 is inventive article internal porosity detection figure.
Specific embodiment
The present invention is described in detail below by specific embodiment, but is not limited the scope of the invention.Unless otherwise specified, originally
Experimental method used by inventing is conventional method, and experiment equipment used, material, reagent etc. commercially obtain.
Embodiment 1
A. 8kg PEEK, 0.01kg carbon black are taken, progress high speed blending, gained mixture in high-speed mixer is added to and exists
It is dried 3 hours at 150 DEG C.
Start double screw extruder, the material being baked is added to charging system 2,3 temperature of double screw extruder is set as
320 DEG C of first segment, 340 DEG C of second segment, 360 DEG C of third section, the 4th section 385 DEG C；380 DEG C of 6 temperature of storage tank, mold 7
385 DEG C of temperature；Long carbon fiber is added in side plus fine mouth, is squeezed out, sets screw speed as 100r/min, charging rate is
5.0r/min；
The material of blending is passed through into 3 extrusion plasticizing of double screw extruder and is expressed into storage tank 6, is kept the temperature；
It heats in extruder and mold 7 is heated simultaneously, low frequency induction heating setpoint parameter area is 17HZ, heating temperature
Spending range is 380 DEG C.
Then mold 7 is fixed below discharge port in mold platform 8, is confined by bolt, start pressure injection, pressure is
6MPa, whole pressure injections are into mold 7.
After the completion of pressure injection, mold 7 by platform courses oil cylinder 9 is controlled mold platform 8, and to be quickly transferred to press 10 enterprising
Row secondary pressurized, pressure are maintained at 20MPa, recompress material.
It keeps briquetting pressure to cool down, cools to 220 DEG C or so, product is taken out after cooling, resulting product is wall
Thickness is 30mm, is highly the tubing of 65mm, through after the assay was approved, being put in storage.Product is detected, testing result such as Fig. 3
It is shown, do not occur wave crest in Fig. 3 between 59-147mm, it was demonstrated that interiors of products pore-free or shrinkage porosite.
The preferable specific embodiment of the above, only the invention, but the protection scope of the invention is not
It is confined to this, anyone skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection scope it
It is interior.
Claims (10)
1. plastic cement transfer molding equipment, which is characterized in that including general control system (1), charging system (2), double screw extruder
(3), storage tank pressure injection system (5), storage tank (6), mold platform (8), platform courses oil cylinder (9) and press (10)；Master control
System (1) is connect with charging system (2), and double screw extruder (3) one end is connect with charging system (2), the other end and storage tank
(6) it connects, storage tank (6) is fixed on cross-head position, and mold platform is equipped between the storage tank (6) and press (10)
(8), platform courses oil cylinder (9) are equipped with below mold platform (8), mould is installed in the mold platform (8) below storage tank (6)
Have (7).
2. equipment according to claim 1, which is characterized in that double screw extruder (3) head and storage tank (6) connection position
It sets and hydraulic control valve (4) is installed.
3. equipment according to claim 1, which is characterized in that the screw rod and gun barrel being located in double screw extruder (3) are adopted
With A grades of bimetallic alloy materials.
4. equipment according to claim 1, which is characterized in that be equipped with Far-infrared Heating inside double screw extruder (3)
Device.
5. equipment according to claim 1, which is characterized in that be located at mold platform (8) upper mold below storage tank (6)
(7) surrounding uses bolt to confine to form an only cast gate as the obturator of opening.
6. equipment according to claim 1, which is characterized in that mold (7) uses low frequency induction heating method, in mold
(7) inside and outside arrangement copper pipe is powered.
7. equipment according to claim 1, which is characterized in that the material of storage tank (6) is ductile cast iron material.
8. using the forming method of plastic cement transfer molding equipment described in claim 1, which comprises the following steps:
(1) ready special engineering plastics raw material, reinforcing agent etc. are subjected to high-speed mixer blending, it is spare；
(2) start double screw extruder, mixed material is added, melt blending squeezes out, and can add fine mouth in the side on extruder wall cylinder
Long fibre is added；Extruder temperature setting divides four sections of controls by extruder structure, and 300-320 DEG C of first segment, second segment 320-340
DEG C, 340-360 DEG C of third section, the 4th section 360-390 DEG C；Screw extruder screw speed 30-180r/min, charging system speed
Set 3-7r/min；
(3) mixed material squeezed out is expressed into the storage tank connecting with head, carries out 375-390 DEG C of heat preservation；
(4) while extruder heats up, applicable mold is heated using low frequency induction, is kept the temperature after reaching required temperature
Half an hour；
(5) confine mold by bolt to be fixed in mold platform；
(6) it is molded by pressure injection system, after the completion of injection molding, mold is moved quickly on press, carries out secondary add to mold
Pressure, recompresses material；
(7) mold is cooled down, reaches suitable calcining temperature, is demoulded.
9. forming method according to claim 8, which is characterized in that special engineering plastics raw material can be thermoplasticity spy
It is any one or several in kind engineering plastics, such as PPS, PPSU, PES, PEI, PEEK；Carbon black may be selected in reinforcing agent.
10. forming method according to claim 8, which is characterized in that low frequency induction heating setpoint parameter area is 17-
19HZ, heating temperature range are 300-395 DEG C；370-390 DEG C of mold temperature；Storage tank pressure injection system pressure 3-12MPa, press
Pressure sets 5-25Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910561312.2A CN110341112A (en) | 2019-06-26 | 2019-06-26 | Plastic cement transfer molding equipment and forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910561312.2A CN110341112A (en) | 2019-06-26 | 2019-06-26 | Plastic cement transfer molding equipment and forming method |
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| CN201910561312.2A Pending CN110341112A (en) | 2019-06-26 | 2019-06-26 | Plastic cement transfer molding equipment and forming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571969A (en) * | 2020-05-25 | 2020-08-25 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | Substrate for green body printing of MLCC wet process and preparation method thereof |
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| CN103231486A (en) * | 2013-03-27 | 2013-08-07 | 株洲宏大高分子材料有限公司 | Transfer moulding forming method and apparatus thereof |
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2019
- 2019-06-26 CN CN201910561312.2A patent/CN110341112A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103231486A (en) * | 2013-03-27 | 2013-08-07 | 株洲宏大高分子材料有限公司 | Transfer moulding forming method and apparatus thereof |
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| 张玉龙: "《橡塑压制成型制品配方设计与加工实例》", 31 January 2006, 国防工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571969A (en) * | 2020-05-25 | 2020-08-25 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | Substrate for green body printing of MLCC wet process and preparation method thereof |
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