CN109514795A - The control method and application of a kind of cambered surface product and its angularity - Google Patents
The control method and application of a kind of cambered surface product and its angularity Download PDFInfo
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- CN109514795A CN109514795A CN201811517337.4A CN201811517337A CN109514795A CN 109514795 A CN109514795 A CN 109514795A CN 201811517337 A CN201811517337 A CN 201811517337A CN 109514795 A CN109514795 A CN 109514795A
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- cambered surface
- surface product
- continuous fiber
- angularity
- sheet material
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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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention discloses the control method and application of a kind of cambered surface product and its angularity, the control method of the cambered surface product angularity, comprising: step 1: it is flat injection mold bottom that continuous fiber reinforced thermoplastic composite material sheet material, which is placed in type chamber,；Step 2: injection molding material being injected into injection mold, obtains cambered surface product through natural cooling after injection molding；The overall thickness of cambered surface product is 2~4mm, and continuous fiber reinforced thermoplastic composite material sheet material accounts for the 10%~50% of cambered surface product overall thickness.The control that the present invention is realized by being formulated design to cambered surface product angularity reduces production process, improves production efficiency without borrowing ancillary equipment to correct warpage.And the product being prepared has excellent mechanical property.
Description
Technical field
The present invention relates to the manufacturing field of cambered surface product more particularly to the control methods of a kind of cambered surface product and its angularity
With application.
Background technique
Continuous fiber reinforced thermoplastic composite material (CFRT) is using thermoplastic resin as matrix, and continuity fiber is enhancing
Material, high intensity, the high rigidity, high tenacity, recyclable novel thermoplastic formed by techniques such as resin melting dipping, extruding
Composite material.Because the fiber in CFRT is continuous, and resin is to impregnating ratio conventional thermoplastic's composite wood of fibre single thread
Expect (such as GMT, LFT) more sufficiently.Therefore its mechanical property is especially stretched and is bent, impact property is also much higher than above-mentioned routine
Thermoplastic composite.
CFRT conventional molding process specifically includes that one, hand pasting forming, the disadvantage is that quality is loose, density is low, product strength
It is not high, and artificial, unstable quality is depended on, production efficiency is very low；Two, injection molding has in terms of working efficiency
A degree of raising, but still can not meet mass production, to manufacture the transition of body of a motor car, hull, bathtub, storage tank
Layer；Three, laminated into type, have the characteristics that mechanization and high degree of automation, stable product quality, but equipment one-time investment
Greatly；Four, Wrapping formed, article construction is single, is only used for manufacture cylindrical body, sphere and certain positive camber revolving bodies or tubular fiber
Product；Five, pultrusion, the technique are suitable for producing the profile of various cross sectional shapes, such as I-shaped, angle-style, groove profile, special-shaped section
The compound section profile of facial canal material and above-mentioned section constitution；Six, liquid forming, the application of this technique, it is necessary to accurate
Based on pipeline and metering and temperature, pressure automatically control, belong to the friendship of high molecular material and modern age high-and-new science and technology
Scope is pitched, current application is not also very wide；Seven, it is pressed and molded, the manufacture of mold early period is complicated, and investment is high, and product size is pressurized
The limitation of machine size.
The relatively above conventional molding process, for CFRT, injection molding is a kind of novel forming technology, this molding work
Skill is that first its semi-finished blank is put into injection mold, using glass fiber-reinforced thermoplastic material injection molding, production
Using reinjection technique.CFRT can be made sufficiently to be combined with discontinuous fiber reinforced plastics, the simple part of structure is with prepreg tape
Sheet material is main body support frame, and by the way of injection molding, this forming method compensates for conventional moulded molding for complicated part
Technique is unable to the drawbacks of molding structure complexity product, and has haved the function that local reinforcement.This moulding process, external product are answered
With very extensive, Lanxess also has many application cases on auto parts and components.In recent years, domestic automobile industry is to lightweight
Requirement it is higher and higher, emerged one after another with moulding the product of Dai Gang, CFRT has the excellent characteristics such as high intensity, high rigidity, high tenacity,
By favor.In addition, injection molding greatly reduces whole production process, whole cycle is reduced, environmental protection is even more enhanced
Mobility adds personalized designs, and safety is also improved, and is integrated lightweight, high stiffness, endurance, energy suction
Receive the application being integrated with function.The compound injection molding of CFRT and discontinuous fiber reinforced plastics is a main trend, can be significantly
Extend the application market of CFRT.
For moulding, buckling deformation is important one of quality index, it not only influences Product Assembly and service performance,
And influence product appearance quality.Since the shrinking percentage of CFRT and discontinuous fiber reinforced plastics has very big difference, to temperature
Susceptibility is also different, leads to meeting buckling deformation after product injection molding, directly affects product qualification rate.
Therefore, in existing research and application, it is the defect that buckling deformation is considered as to plastic products, needs as far as possible
It avoids, or is improved.This cognition is similarly present in the preparation process of cambered surface product.Cambered surface product, such as curved surface mobile phone
Shell, curved surface LED display rear cover etc., when producing it may first have to design the mold of a secondary arc shape type chamber, next is directed to
Warpage issues after molding, it is also necessary to which correction adjustment buckling deformation not only increases many mold processing to obtain qualified products in this way
Expense, and the expenses such as auxiliary modular system, artificial are increased, even more elongate the production cycle.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of control methods of cambered surface product angularity, are set by formula
Meter realizes the control to cambered surface product angularity, without borrowing ancillary equipment to correct warpage, reduces production process, improves
Production efficiency.And the product being prepared has excellent mechanical property.
Specific technical solution is as follows:
A kind of control method of cambered surface product angularity, comprising:
Step 1: it is flat injection mold bottom that continuous fiber reinforced thermoplastic composite material sheet material, which is placed in type chamber,；
Step 2: injection molding material being injected into injection mold, obtains cambered surface product through natural cooling after injection molding；
The overall thickness of the cambered surface product is 2~4mm, and continuous fiber reinforced thermoplastic composite material sheet material accounts for cambered surface product
The 10%~50% of overall thickness.
The present invention overcomes the technology prejudice for the defect that " warpage " is considered as to plastic products in the prior art, pass through
Continuous fiber reinforced thermoplastic composite material is compound with fiber-reinforced thermoplastic, and pass through regulation continuous fiber reinforcement heat
The thickness range of plastic composites regulates and controls the angularity of cambered surface product, and buckling deformation is used.The technical solution
Advantage is: different angularity products only need one group of plane mould can be realized, i.e., without designing camber, without according to not
Angularity with cambered surface product requires to be respectively designed to the different mold of radian；It is compound by control continuous fiber reinforced thermoplastic
The thickness of material can be obtained the cambered surface product of certain angularity, i.e., from formula material, without borrowing ancillary equipment to correct
Warpage further reduces production process, improves production efficiency.
Preferably, the type chamber of the shape and injection mold of the continuous fiber reinforced thermoplastic composite material sheet material
Shape is adapted.It is so-called " adaptable ", refer to the shape and injection mold type of continuous fiber reinforced thermoplastic composite material sheet material
The shape of chamber is identical, is sheet.But the size outline of continuous fiber reinforced thermoplastic composite material sheet material is less than injection mold
The size of type chamber, the space that edge reserves, one can be prevented from continuous fiber reinforced thermoplastic composite material sheet material in high temperature
It is lower expansion and be deformed, be subject to second is that injection molding material can be allowed to be coated on continuous fiber reinforced thermoplastic composite material sheet edge
Modification, the appearance for the final cambered surface product for being are more beautiful.Preferably, the continuous fiber reinforced thermoplastic composite material sheet material
The corresponding injection mold of Edge Distance edge be 5~10mm.
Preferably, the substrate of the continuous fiber reinforced thermoplastic composite material sheet material is selected from polypropylene, continuous fiber choosing
From continuous glass fibre, in terms of raw material gross weight, the weight percent content of continuous fiber is 50~70%.Further preferably
60%.
Continuous fiber reinforced thermoplastic composite material sheet material is prepared through molding, mould pressing process are as follows:
Sheet material → Lay up design → heating → compression molding.
Preferably, the injection mold is two board molds, to surround flat type chamber.
Preferably, positioning column, the continuous fiber reinforced thermoplastic composite material piece are equipped in the molding mold cavity
Material is equipped with location hole, and the positioning column matches with the positioning pore size, is used for the continuous fiber reinforced thermoplastic
Composite material sheet is fixed on the injection mold bottom.Further preferably, the quantity of the positioning column is two.
Preferably, the injection molding material is long glass fiber reinforced polypropylene material, in terms of raw material gross weight, long glass fibres
Weight percent content be 20~40%, further preferably 30%.
PP is enhanced using continuous glass-fiber, because it possesses higher specific stiffness and specific strength, excellent combination property；Roving glass fiber increases
Strong PP specific gravity is small, easily molded, and injecting products have good presentation quality.The two is used in combination, and can reach product high-performance
It is required that appearance requirement, is also easy to uniformly recycle, and reuse ratio is high.
The injection molding machine is horizontal injection press, and using the injection mold, the injection molding includes molding, is filled, and is protected
Pressure, it is cooling, it is opened five processes.Preferably, the injection molding process are as follows:
Melt temperature is 200~220 DEG C, and injection speed is 20~40mm/s, and injection pressure is 30~50MPa, when cooling
Between be 8~12s.
After product takes out, natural cooling is carried out, the temperature range of natural cooling condition is 20~26 DEG C.
Further preferably, the overall thickness of the cambered surface product is 3mm, and continuous fiber reinforced thermoplastic composite material sheet material accounts for
The 10%~50% of cambered surface product overall thickness.
The invention also discloses the cambered surface product being prepared according to the above method, the adjustable range of angularity is 0.015
~0.035.
The invention also discloses above-mentioned cambered surface products to prepare answering in curved surface mobile phone shell, curved surface LED display rear cover etc.
With.
Compared with prior art, the beneficial effects of the present invention are:
The present invention overcomes the technology prejudice of plastic products, and " warpage " as defect is used, by will be continuous
Fiber reinforced thermolplastic composite material is compound with fiber-reinforced thermoplastic, and multiple by regulation continuous fiber reinforced thermoplastic
The thickness range of condensation material regulates and controls the angularity of cambered surface product, and buckling deformation is used.The advantage of the technical solution exists
In: different angularity products only need one group of plane mould can be realized, i.e., without designing camber, without according to different cambered surfaces
The angularity of product requires to be respectively designed to the different mold of radian；Pass through control continuous fiber reinforced thermoplastic composite material
Thickness can be obtained the cambered surface product of certain angularity, i.e., from formula material, without borrowing ancillary equipment to correct warpage, into
One step reduces production process, improves production efficiency.
Detailed description of the invention
Fig. 1 is the schematic diagram of preparation cambered surface product of the invention；
In figure, 1- injection mold, 2- positioning column, 3-CFRT sheet material, 4- injection molding sheet material.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.
Use identical injection mold 1 in following embodiment and comparative example, type chamber is tabular, length 210mm, wide
Degree is 140mm, and going back symmetric design with a thickness of 3mm, in type chamber, there are two positioning columns 2, is detailed in attached drawing.
The raw material composition of the CFRT sheet material and injection molding material that are respectively adopted in each embodiment and comparative example is as follows:
The raw material of CFRT sheet material forms are as follows:
The raw material of injection molding material forms are as follows:
The testing standard used in each embodiment and comparative example is as follows:
The test reference ISO 527-4 standard of tensile strength；
14125 standard of test reference ISO of bending strength；
14125 standard of test reference ISO of bending modulus；
The calculation formula of angularity are as follows:
Wherein, h is amount of warpage, and l is the projected length of evaluation goal in particular directions.
Embodiment 1
Step 1 is molded the obtained CFRT sheet material 3 with a thickness of 0.3mm using the composition of raw materials of above-mentioned CFRT sheet material；
Two location holes are cut in step 2, the position being adapted on CFRT sheet material with positioning column in injection mold, then will
It is placed in injection mold；
Step 3 mixes each raw material of injection molding material, injects in injection mold after melting, in CFRT piece after cooling and solidifying
Product is obtained after 3 upper surface of material covering injection molding sheet material 4, melt temperature is 210 DEG C, injection speed 30mm/s, and injection pressure is
40MPa, cooling time 10s；
Again through natural cooling after step 4, product taking-up, final cambered surface product is obtained.
The various performance parameters of cambered surface product manufactured in the present embodiment are listed in the table below in 1.
Embodiment 2
Step 1 is molded the obtained CFRT sheet material with a thickness of 0.5mm using the composition of raw materials of above-mentioned CFRT sheet material；
Two location holes are cut in step 2, the position being adapted on CFRT sheet material with positioning column in injection mold, then will
It is placed in injection mold；
Step 3 mixes each raw material of injection molding material, injects in injection mold after melting, product is obtained after cooling and solidifying,
Melt temperature be 210 DEG C, injection speed 30mm/s, injection pressure 40MPa, cooling time 10s；
Again through natural cooling after step 4, product taking-up, final cambered surface product is obtained.
The various performance parameters of cambered surface product manufactured in the present embodiment are listed in the table below in 1.
Embodiment 3
Step 1 is molded the obtained CFRT sheet material with a thickness of 0.8mm using the composition of raw materials of above-mentioned CFRT sheet material；
Two location holes are cut in step 2, the position being adapted on CFRT sheet material with positioning column in injection mold, then will
It is placed in injection mold；
Step 3 mixes each raw material of injection molding material, injects in injection mold after melting, product is obtained after cooling and solidifying,
Melt temperature be 210 DEG C, injection speed 30mm/s, injection pressure 40MPa, cooling time 10s；
Again through natural cooling after step 4, product taking-up, final cambered surface product is obtained.
The various performance parameters of cambered surface product manufactured in the present embodiment are listed in the table below in 1.
Embodiment 4
Step 1 is molded the obtained CFRT sheet material with a thickness of 1.2mm using the composition of raw materials of above-mentioned CFRT sheet material；
Two location holes are cut in step 2, the position being adapted on CFRT sheet material with positioning column in injection mold, then will
It is placed in injection mold；
Step 3 mixes each raw material of injection molding material, injects in injection mold after melting, product is obtained after cooling and solidifying,
Melt temperature be 210 DEG C, injection speed 30mm/s, injection pressure 40MPa, cooling time 10s；
Again through natural cooling after step 4, product taking-up, final cambered surface product is obtained.
The various performance parameters of cambered surface product manufactured in the present embodiment are listed in the table below in 1.
Embodiment 5
Step 1 is molded the obtained CFRT sheet material with a thickness of 1.5mm using the composition of raw materials of above-mentioned CFRT sheet material；
Two location holes are cut in step 2, the position being adapted on CFRT sheet material with positioning column in injection mold, then will
It is placed in injection mold；
Step 3 mixes each raw material of injection molding material, injects in injection mold after melting, product is obtained after cooling and solidifying,
Melt temperature be 210 DEG C, injection speed 30mm/s, injection pressure 40MPa, cooling time 10s；
Again through natural cooling after step 4, product taking-up, final cambered surface product is obtained.
The various performance parameters of cambered surface product manufactured in the present embodiment are listed in the table below in 1.
Comparative example 1
Step 1 mixes each raw material of injection molding material, injects in injection mold after melting, product is obtained after cooling and solidifying,
Melt temperature be 210 DEG C, injection speed 30mm/s, injection pressure 40MPa, cooling time 10s；
Again through natural cooling after step 2, product taking-up.
The various performance parameters of the cambered surface product of this comparative example preparation are listed in the table below in 1.
Table 1
By analysis above embodiments and comparative example data it is not difficult to find that using method of the invention, Examples 1 to 5 system
The variation of certain rule is presented in the angularity of standby cambered surface product, and different CFRT sheet thickness obtain different cambered surface product,
It can control its thickness and obtain the cambered surface product of specific angularity, for different product structure, select the prepreg tape of different-thickness
Sheet material be molded it is compound, can achieve local strengthening and also can use buckling deformation as a result, angularity in the present invention
Controlled range is 0.015~0.035.
Comparative example 5 and comparative example 1, the CFRT sheet thickness in embodiment 5 is 1.5mm, and is not had in comparative example 1
CFRT sheet material, tensile strength, bending strength, the bending modulus of embodiment 5 are substantially better than comparative example 1.
Comparative example 5 and embodiment 1, CFRT sheet thickness is only 0.3mm in embodiment 1, and tensile strength, bending are strong
Degree, bending modulus are more lower than embodiment 5, and the angularity of deformation is big.According to different application to intensity and product shape
The different of shape require, and suitable CFRT sheet thickness may be selected, to reach the requirement of product.
And equipment used in the method announced of the present invention is simple, easy to implement and operation reduces production process, significantly
Production efficiency is improved, has wide application prospect.
Claims (9)
1. a kind of control method of cambered surface product angularity characterized by comprising
Step 1: it is flat injection mold bottom that continuous fiber reinforced thermoplastic composite material sheet material, which is placed in type chamber,；
Step 2: injection molding material being injected into injection mold, obtains cambered surface product through natural cooling after injection molding；
The overall thickness of the cambered surface product is 2~4mm, and continuous fiber reinforced thermoplastic composite material sheet material accounts for cambered surface product total thickness
The 10%~50% of degree.
2. the control method of cambered surface product angularity according to claim 1, which is characterized in that the continuous fiber reinforcement
The shape of the type chamber of the shape of thermoplastic composite sheet material and the injection mold is adapted, the continuous fiber reinforcement thermoplastic
Property composite material sheet the corresponding injection mold of Edge Distance edge be 5~10mm.
3. the control method of cambered surface product angularity according to claim 1, which is characterized in that the continuous fiber reinforcement
The substrate of thermoplastic composite sheet material is selected from polypropylene, and continuous fiber is selected from continuous glass fibre, in terms of raw material gross weight, even
The weight percent content of continuous fiber is 50~70%.
4. the control method of cambered surface product angularity according to claim 1, which is characterized in that the molding mold cavity
It is interior be equipped with positioning column, the continuous fiber reinforced thermoplastic composite material sheet material be equipped with location hole, the positioning column with it is described
Positioning pore size matches, for the continuous fiber reinforced thermoplastic composite material sheet material to be fixed on the injection mold bottom
Portion.
5. the control method of cambered surface product angularity according to claim 1, which is characterized in that the injection molding material is long glass
Glass fiber reinforced polypropylene material, in terms of raw material gross weight, the weight percent content of long glass fibres is 20~40%.
6. the control method of cambered surface product angularity according to claim 1, which is characterized in that the injection molding process
Are as follows:
Melt temperature is 200~220 DEG C, and injection speed is 20~40mm/s, and injection pressure is 30~50MPa, cooling time 8
~12s.
7. the control method of any cambered surface product angularity according to claim 1~6, which is characterized in that the cambered surface
The overall thickness of product is 3mm, and continuous fiber reinforced thermoplastic composite material sheet material accounts for the 10%~50% of cambered surface product overall thickness.
8. a kind of cambered surface product that the method any according to claim 1~7 is prepared, which is characterized in that angularity
Adjustable range be 0.015~0.035.
9. a kind of cambered surface product according to claim 8 prepare curved surface mobile phone shell, answering in curved surface LED display rear cover
With.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811517337.4A CN109514795B (en) | 2018-12-12 | 2018-12-12 | Cambered surface workpiece and control method and application of warping degree thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811517337.4A CN109514795B (en) | 2018-12-12 | 2018-12-12 | Cambered surface workpiece and control method and application of warping degree thereof |
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| CN109514795A true CN109514795A (en) | 2019-03-26 |
| CN109514795B CN109514795B (en) | 2020-10-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03278921A (en) * | 1990-03-29 | 1991-12-10 | Nec Home Electron Ltd | Injection molding method |
| JPH0760785A (en) * | 1993-08-25 | 1995-03-07 | Mitsubishi Gas Chem Co Inc | Synthetic resin molded product and its manufacture |
| JPH07299840A (en) * | 1994-05-09 | 1995-11-14 | Tokuyama Corp | Production of thin-walled molded product |
| CN107118437A (en) * | 2017-05-18 | 2017-09-01 | 中广核俊尔新材料有限公司 | Lower shrinkage, Long Glass Fiber Reinforced PP Composite of low warpage and its preparation method and application |
| CN107567375A (en) * | 2015-05-08 | 2018-01-09 | 乐金华奥斯有限公司 | Using fibre reinforced composites insert injection molding method and utilize its injection-molded article |
-
2018
- 2018-12-12 CN CN201811517337.4A patent/CN109514795B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03278921A (en) * | 1990-03-29 | 1991-12-10 | Nec Home Electron Ltd | Injection molding method |
| JPH0760785A (en) * | 1993-08-25 | 1995-03-07 | Mitsubishi Gas Chem Co Inc | Synthetic resin molded product and its manufacture |
| JPH07299840A (en) * | 1994-05-09 | 1995-11-14 | Tokuyama Corp | Production of thin-walled molded product |
| CN107567375A (en) * | 2015-05-08 | 2018-01-09 | 乐金华奥斯有限公司 | Using fibre reinforced composites insert injection molding method and utilize its injection-molded article |
| CN107118437A (en) * | 2017-05-18 | 2017-09-01 | 中广核俊尔新材料有限公司 | Lower shrinkage, Long Glass Fiber Reinforced PP Composite of low warpage and its preparation method and application |
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