CN109483818A - A kind of phone housing injection molded method - Google Patents
A kind of phone housing injection molded method Download PDFInfo
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- CN109483818A CN109483818A CN201811448146.7A CN201811448146A CN109483818A CN 109483818 A CN109483818 A CN 109483818A CN 201811448146 A CN201811448146 A CN 201811448146A CN 109483818 A CN109483818 A CN 109483818A
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- runner
- plastic
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- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229920003023 plastic Polymers 0.000 claims abstract description 35
- 239000004033 plastic Substances 0.000 claims abstract description 35
- 238000001746 injection moulding Methods 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000000047 product Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 15
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 3
- 239000013256 coordination polymer Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2756—Cold runner channels
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C2045/445—Removing or ejecting moulded articles for undercut articles using the movable undercut forming element for ejection of the moulded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3431—Telephones, Earphones
- B29L2031/3437—Cellular phones
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of phone housing injection molded methods, include the following steps: S1, three-dimensional modeling is carried out to Cellphone Accessories rear cover product using software, the quality of phone housing mold plastic and the calculating of injection volume are completed, determines injection molding machine model and mold cavity number；S2, the design for completing mold；S3, the pretreatment for completing raw material select zinc stearate as release agent, and complete the cleaning of injector barrel；S4, it fed, be plasticized through injection molding machine, being injected into mould, pressure stabilizing cooling and stripping operation, completing the injection moulding of phone housing mold plastic；S5, annealing is carried out 1~3 hour to mobile phone outer casing mold plastic.This invention ensures that the working life of mold.
Description
Technical field
The present invention relates to phone housing production fields, and in particular to a kind of phone housing injection molded method.
Background technique
Phone housing is that one kind is small in size, and the plastic part of shape, structure complexity is more demanding to mould design and manufacture.
Summary of the invention
The object of the present invention is to provide a kind of phone housing injection molded methods.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of phone housing injection molded method, it is characterised in that: include the following steps；
S1, three-dimensional modeling is carried out to Cellphone Accessories rear cover product using software, completes the quality of phone housing mold plastic
And the calculating of injection volume, determine injection molding machine model and mold cavity number；
S2, the design for completing mold；
S3, the pretreatment for completing raw material
(1) requirement according to injection moulding to material, examines the water content of material, appearance luster, particle situation is simultaneously tested
The indexs such as its thermal stability, mobility and shrinking percentage need to carry out preheating and drying appropriate to raw material when water content is exceeded,
2~4h can be dried at 70~80 DEG C；Select zinc stearate as release agent；
(2) cleaning of injector barrel is completed
S4, process of injection molding
It fed, be plasticized through injection molding machine, being injected into mould, pressure stabilizing cooling and stripping operation, completing the modeling of phone housing mold
The injection moulding of part；
The post-processing of S5, product
Annealing is carried out 1~3 hour to mobile phone outer casing mold plastic.
Further, the casting system of the mold includes four sprue, runner, cast gate and cold slug well parts, is somebody's turn to do
Sprue design is conical, and cone angle is 2 °~4 °；End diameter d is 0.5mm~1mm bigger than nozzle of injector diameter；Small end
Before be spherical surface, depth be 3mm~5mm, sprue spherical radius is 1mm~2mm bigger than nozzle spherical radius so that
The spherical surface of nozzle of injector is contacted and is bonded with mold in the position；The surface roughness value R of runneraIt is 0.08；Sprue
Sprue bush is manufactured using high-quality steel T8A material, heat-treatment quenching hardness 53HRC-57HRC.
Further, runner is the coupling part of sprue and cast gate, under conditions of guaranteeing injection molding technique, point
The sectional area of runner should be as small as possible, and length should be short as far as possible；
The end of longer runner should open up cold slug well, and cold burden and air enter die cavity when preventing injection；
When runner is provided with the side of cover half, and extends very long from cast gate, Yao Jiashe sprue puller, when convenient for die sinking
Cold burden is easily deviate from；
When runner is more, Ying Jiashe spreader avoids the plastics of melting from being directly entered die cavity and go out type chamber；
When designing runner, lesser size should be selected, first in order to be repaired according to the actual situation after die trial；Runner
Surface roughness requirements reach 1.6 μm.
Further, cast gate is the melt canal for connecting runner and type chamber, and the mold uses two chamber of a mould, selects side
Cast gate, side gate are semi-circular shape.
Further, the type chamber arrangement of mold uses symmetrical, and to prevent mold bears unbalance loading and generates flash, use is whole
Body formula type chamber, size are calculated by following steps:
The average shrinkage ratio of selected ABS material is 0.5%, just calculates the formula of mold forming component working size are as follows:
A=B+0.005B
The size of A- mold forming component at normal temperature in formula
B- plastic actual size at normal temperature
Mold manufacturing tolerance takes IT8 grades, and type core working size tolerance takes IT7 grades, and the minimum dimension of mold cavity is basic
Size, deviation are positive value；The full-size of mold cores is basic size, and deviation is negative value, and deviation of centre distance is bi-directional symmetrical
Distribution；
1. the radial dimension of calculating of type core:
By the radial dimension of average shrinkage ratio calculation type core:
The average shrinkage ratio for being looked into ABS known to " Design of Plastic Mould handbook " is 1.005, according to precision of plastic grade
(IT8), radial basic size is 125.62mm, then its floating is having a size of so its floating having a size of 125.62+
0.48 0
According to formula LM=[LS+SCP·LS+3 4Δ]-δ
LM=[125.62+125.62 × 1.005+3 4×0.48]- δ=Δ/3
LM=131.679-0.16
L in formulaMPart manufacturing radial dimension；
LSRadial basic size；
δ-is equal to Δ/3 for small parts (Δ is the tolerance value that product allows)；
2. the height of type core size calculates
Also carry out calculated value by shrinking percentage: at this moment providing that the nominal size HS of product hole depth is minimum dimension, deviation
Δ is overgauge, and the nominal size of type core height is that HM is full-size, and deviation is minus deviation, and its basic size is
10.55mm floats having a size of 10.55+0.92 0, ibid available type core height nominal size:
HM=[HS+SCP·HS+2 3 Δ]-δ
HM=10.55-0.3
3. the radial dimension of calculating of type chamber:
Its size is also calculated by average shrinkage ratio, it is known that average shrinkage ratio S under prescribed conditionsCP=
1.005, the nominal size of product type chamber is LM(minimum dimension), tolerance value are δ (overgauge), then the average-size of type chamber are as follows: LM
+δ2；In view of shrinkage and attrition value, its calculation formula is:
LM=[LS+LS·SCP-3 4 Δ]+δ
A. when basic size is 10.55mm, value as follows can be obtained:
LM=[10.55+10.55 × 1.005-3 4×0.56]+Δ/3
LM=10.55+0.18 0
So LM=10.55+0.18 0
B. when basic size is 24mm, value as follows can be obtained:
LM=[24+24 × 1.8%-3 4×0.92]+Δ/3
LM=23.74+0.26 0
So LM=23.94+0.26 0
C. when basic size is 30mm, value as follows can be obtained:
LM=[30+30 × 1.8%-3 4×0.92]+Δ/3
LM=29.85+0.26 0
So LM=29.85+0.26 0
4. the calculating of depth of cavity size:
By the depth dimensions of average shrinkage ratio calculation type chamber, it is specified that product height in the calculating of depth of cavity size
Nominal size HSFor full-size, tolerance is indicated with minus deviation；Depth of cavity nominal size HMFor minimum dimension, tolerance is with positively biased
Difference indicates that the bottom of type chamber or the end face of type core are parallel with die joint, wears very little abrasion loss during demoulding and does not just consider,
According to formula
HM=[HS+HS·SCP-2 3Δ]+δ
It can obtain
A. when depth dimensions are 2mm:
HM=[2+2 × 1.8%-2 3×0.32]+0.32/3
HM=1.82+0.1 0
B. when depth dimensions are 22mm:
HM=[22+22 × 1.8%-2 3×0.92]+0.92/3
HM=21.78+0.3 0.
Further, the mold is by the way of the exhaust of gap.
Further, demould plastic part smoothly using push plate plus push rod ejecting mechanism；Push rod ejecting mechanism is using department
Cylinder needle ejects BOSS column position, and back-off position uses 10 lifter ejections, in addition increases by two straight tops, these push rods and straight top are equal
Even is distributed at product edges, keeps launch force suffered by product balanced；Push rod uses the circular cross-section push rod of shoulder form, pushes away
Rod end plane should not have axial float, push rod and push-rod hole to overflow with H8/f8 or H9/f9, fit clearance is combined into no more than used
Expect gap, in order to avoid generating overlap, the flash gap of ABS plastic is 0.04~0.06mm.
Further, the oblique top angle of mold is 5 °, and oblique top bottom is fixed on ejector retainner plate, is moved simultaneously with ejector retainner plate,
For ejecting product, core pulling is completed.
Further, the model of the mould bases of the mold are as follows: LKM CI-3540-A60-B70-C100.
The present invention sets the running gate system, the structure of moulding section, demoulding mechanism of mold from specific mould structure
The selection and check of meter, cooling system, injector, the structure being designed in this way out can ensure that mold before normal operation
It puts, ensure that the working life of mold.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment
A kind of phone housing injection molded method, includes the following steps；
S1, three-dimensional modeling is carried out to Cellphone Accessories rear cover product using software, completes the quality of phone housing mold plastic
And the calculating of injection volume, determine injection molding machine model and mold cavity number；It is specific: to be analyzed by three-dimensional software Modeling and Design
The volume and quality of plastic
The volume of plastic: v1=6.7cm3
It calculates the quality of plastic: being ρ=1.05g/cm according to the density that design manual can check in ABS3
Plastic part quality: m=v1·ρ (2-1)
The total volume of the plastics of primary injection mold cavity are as follows:
V=v1(1+0.2) x2=6.7 × 1.2 × 2cm3=16.08cm3
V/0.8=16.08/0.8=20.1
Using the mould structure of a mould two pieces, consider its outer dimension, when injection molding required pressure and factory's existing equipment etc.
Situation, it is preliminary to select injection molding machine sea day SA1200/410U type.
ABS material is used in the present embodiment；The main performance index of ABS is specifically shown in such as table 1, molding proces s parameters such as table 2.
1 ABS main performance index of table
The molding proces s parameters of 2 ABS of table
S2, the design for completing mold；
S3, the pretreatment for completing raw material
(1) requirement according to injection moulding to material, examines the water content of material, appearance luster, particle situation is simultaneously tested
The indexs such as its thermal stability, mobility and shrinking percentage need to carry out preheating and drying appropriate to raw material when water content is exceeded,
2~4h can be dried at 70~80 DEG C；Select zinc stearate as release agent；
(2) cleaning of injector barrel is completed
S4, process of injection molding
It fed, be plasticized through injection molding machine, being injected into mould, pressure stabilizing cooling and stripping operation, completing the modeling of phone housing mold
The injection moulding of part；
The post-processing of S5, product
Annealing is carried out 1~3 hour to mobile phone outer casing mold plastic.
Further, the casting system of the mold includes four sprue, runner, cast gate and cold slug well parts, is somebody's turn to do
Sprue design is conical, and cone angle is 2 °~4 °；End diameter d is 0.5mm~1mm bigger than nozzle of injector diameter；Small end
Before be spherical surface, depth be 3mm~5mm, sprue spherical radius is 1mm~2mm bigger than nozzle spherical radius so that
The spherical surface of nozzle of injector is contacted and is bonded with mold in the position；The surface roughness value R of runneraIt is 0.08；Sprue
Sprue bush is manufactured using high-quality steel T8A material, heat-treatment quenching hardness 53HRC-57HRC.
Further, runner is the coupling part of sprue and cast gate, under conditions of guaranteeing injection molding technique, point
The sectional area of runner should be as small as possible, and length should be short as far as possible；
The end of longer runner should open up cold slug well, and cold burden and air enter die cavity when preventing injection；
When runner is provided with the side of cover half, and extends very long from cast gate, Yao Jiashe sprue puller, when convenient for die sinking
Cold burden is easily deviate from；
When runner is more, Ying Jiashe spreader avoids the plastics of melting from being directly entered die cavity and go out type chamber；
When designing runner, lesser size should be selected, first in order to be repaired according to the actual situation after die trial；Runner
Surface roughness requirements reach 1.6 μm.
Further, cast gate is the melt canal for connecting runner and type chamber, and the mold uses two chamber of a mould, selects side
Cast gate, side gate are semi-circular shape.
Further, the type chamber arrangement of mold uses symmetrical, and to prevent mold bears unbalance loading and generates flash, use is whole
Body formula type chamber, size are calculated by following steps:
The average shrinkage ratio of selected ABS material is 0.5%, just calculates the formula of mold forming component working size are as follows:
A=B+0.005B
The size of A- mold forming component at normal temperature in formula
B- plastic actual size at normal temperature
Mold manufacturing tolerance takes IT8 grades, and type core working size tolerance takes IT7 grades, and the minimum dimension of mold cavity is basic
Size, deviation are positive value；The full-size of mold cores is basic size, and deviation is negative value, and deviation of centre distance is bi-directional symmetrical
Distribution；
1. the radial dimension of calculating of type core:
By the radial dimension of average shrinkage ratio calculation type core:
The average shrinkage ratio for being looked into ABS known to " Design of Plastic Mould handbook " is 1.005, according to precision of plastic grade
(IT8), radial basic size is 125.62mm, then its floating is having a size of so its floating having a size of 125.62+
0.48 0
According to formula LM=[LS+SCP·LS+3 4Δ]-δ
LM=[125.62+125.62 × 1.005+3 4×0.48]- δ=Δ/3
LM=131.679-0.16
L in formulaMPart manufacturing radial dimension；
LSRadial basic size；
δ-is equal to Δ/3 for small parts (Δ is the tolerance value that product allows)；
2. the height of type core size calculates
Also carry out calculated value by shrinking percentage: at this moment providing that the nominal size HS of product hole depth is minimum dimension, deviation
Δ is overgauge, and the nominal size of type core height is that HM is full-size, and deviation is minus deviation, and its basic size is
10.55mm floats having a size of 10.55+0.920, ibid available type core height nominal size:
HM=[HS+SCP·HS+2 3 Δ]-δ
HM=10.55-0.3
3. the radial dimension of calculating of type chamber:
Its size is also calculated by average shrinkage ratio, it is known that average shrinkage ratio S under prescribed conditionsCP=
1.005, the nominal size of product type chamber is LM(minimum dimension), tolerance value are δ (overgauge), then the average-size of type chamber are as follows: LM
+δ2；In view of shrinkage and attrition value, its calculation formula is:
LM=[LS+LS·SCP-3 4 Δ]+δ
A. when basic size is 10.55mm, value as follows can be obtained:
LM=[10.55+10.55 × 1.005-3 4×0.56]+Δ/3
LM=10.55+0.18 0
So LM=10.55+0.18 0
B. when basic size is 24mm, value as follows can be obtained:
LM=[24+24 × 1.8%-3 4×0.92]+Δ/3
LM=23.74+0.26 0
So LM=23.94+0.26 0
C. when basic size is 30mm, value as follows can be obtained:
LM=[30+30 × 1.8%-3 4×0.92]+Δ/3
LM=29.85+0.26 0
So LM=29.85+0.26 0
4. the calculating of depth of cavity size:
By the depth dimensions of average shrinkage ratio calculation type chamber, it is specified that product height in the calculating of depth of cavity size
Nominal size HSFor full-size, tolerance is indicated with minus deviation；Depth of cavity nominal size HMFor minimum dimension, tolerance is with positively biased
Difference indicates that the bottom of type chamber or the end face of type core are parallel with die joint, wears very little abrasion loss during demoulding and does not just consider,
According to formula
HM=[HS+HS·SCP-2 3Δ]+δ
It can obtain
A. when depth dimensions are 2mm:
HM=[2+2 × 1.8%-2 3×0.32]+0.32/3
HM=1.82+0.1 0
B. when depth dimensions are 22mm:
HM=[22+22 × 1.8%-2 3×0.92]+0.92/3
HM=21.78+0.3 0.
Further, the mold is by the way of the exhaust of gap.
Further, demould plastic part smoothly using push plate plus push rod ejecting mechanism；Push rod ejecting mechanism is using department
Cylinder needle ejects BOSS column position, and back-off position uses 10 lifter ejections, in addition increases by two straight tops, these push rods and straight top are equal
Even is distributed at product edges, keeps launch force suffered by product balanced；Push rod uses the circular cross-section push rod of shoulder form, pushes away
Rod end plane should not have axial float, push rod and push-rod hole to overflow with H8/f8 or H9/f9, fit clearance is combined into no more than used
Expect gap, in order to avoid generating overlap, the flash gap of ABS plastic is 0.04~0.06mm.Casing product contains there are three BOSS column,
BOSS is using the identical ejector pin ejection of three sizes, and specification size is identical as pillar size: φ 1.3x φ 3x200x150.
Further, the oblique top angle of mold is 5 °, and oblique top bottom is fixed on ejector retainner plate, is moved simultaneously with ejector retainner plate,
For ejecting product, core pulling is completed.
Further, according to the comprehensive analysis to plastic, determine that the mold is the mold of single die joint, by GB/
The mould bases of CI type may be selected in T12556.1-12556.2-1990 " the middle-size and small-size mould bases of injection molding ".
CI type stationary mould for mould uses two pieces of templates, and dynamic model uses one piece of template, is called two template dies, and style big water gap mould bases is suitble to
Spot pouring mouth, sub-marine gate, using the injection moulding mold of side core and slant-top core-pulling etc..
The thickness of corresponding template and the outer profile size of mold can be selected according to the basic model of selected mould bases,
By calculating it is known that the mold is the mold of two chamber of a mould:
Type chamber, which is arranged in two chamber of a mould, can measure a length of 250mm, width 200mm；
Diameter+screw diameter of the long L=250+ release link of mould bases+cavity wall thickness ≈ 400mm；
The diameter of the wide W=200+ release link of mould bases+cavity wall thickness ≈ 350mm.
According to the size of interior mode, after the length and width of mould bases have been calculated, it is also necessary to consider the parts such as other screw guide posts
Influence to mould bases size, avoids interference in the design.
So just take the mould bases of B × L=350x400, plastic with a thickness of 4mm, most glue position of plastic all stays in fixed
Mould part, the mold cavity structure is simple, and the fixation of type core, type chamber is fixed total height plus 30-50mm, and the thickness of B plate takes
70mm meets intensity requirement, and A plate is 60mm, and C plate is that (whether the release distance that the selection of C is considered as ejecting mechanism is full by 100mm
The height released enough).
Using the CI3540 standard die set of dragon note in the present embodiment, the height of standard support block is 100mm, fully meets top
It requires out.
The model of selected mould bases in summary are as follows: LKM CI-3540-A60-B70-C100.
(1) size of selected mould bases is checked according to selected injector
Mold dynamic model cover half fixed pan size 350x400 < 410mmx410mm (pull rod spacing), it is qualified to check.
(2) mold height size
Mold closure height must satisfy following formula
Hmin< H < Hmax
H in formulamin-- the maximum norm that injector allows is thick
Hmax-- the minimum modulus that injector allows is thick
Mold is closed height 290mm, 290mm < 355mm < 450mm (minimum thickness of mold, the maximum gauge of mold),
It is qualified to check.
(3) mold opening stroke
For horizontal injection press, opening stroke is related with mold thickness, should have for multiple parting lines injection mold:
Smax>=S=H1+H2+(5-10)mm (6-2)
H in formula1-- release distance
H2-- the plastic height including gating system of material
S=H1+H2+ (5~10) < of mm=140~150 500 (opening stroke), it is qualified to check.
The cooling of mold mainly uses circulating water mode, and the heating of mold is passed through hot water, steam, hot oil and resistance
Silk heating etc..Cooling duct be preferably provided be in convex module and female die block, in general, the cooling duct of punching block and die surface,
The distance of die cavity or the mould heart should be maintained 1~2 times of cooling channel diameter, the spacing between cooling duct should maintain 3~5 times it is straight
Diameter.Cooling channel diameter is usually 6~12mm (7/16~9/16 inch), takes 6mm herein.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. a kind of phone housing injection molded method, it is characterised in that: include the following steps；
S1, using software to Cellphone Accessories rear cover product carry out three-dimensional modeling, complete phone housing mold plastic quality and
The calculating of injection volume determines injection molding machine model and mold cavity number；
S2, the design for completing mold；
S3, the pretreatment for completing raw material
(1) requirement according to injection moulding to material, examines the water content of material, appearance luster, and particle situation simultaneously tests its heat
The indexs such as stability, mobility and shrinking percentage need to carry out preheating and drying appropriate to raw material when water content is exceeded, can be
Dry 2~4h at 70~80 DEG C；Select zinc stearate as release agent；
(2) cleaning of injector barrel is completed
S4, process of injection molding
It fed, be plasticized through injection molding machine, being injected into mould, pressure stabilizing cooling and stripping operation, completing phone housing mold plastic
Injection moulding；
The post-processing of S5, product
Annealing is carried out 1~3 hour to mobile phone outer casing mold plastic.
2. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: the mold pours
System includes four sprue, runner, cast gate and cold slug well parts, and sprue design is conical, and cone angle is 2 °~
4°；End diameter d is 0.5mm~1mm bigger than nozzle of injector diameter；It is spherical surface before small end, depth is 3mm~5mm, main
Runner spherical radius is 1mm~2mm bigger than nozzle spherical radius, so that the spherical surface of nozzle of injector connects with mold in the position
It touches and is bonded；The surface roughness value R of runneraIt is 0.08；Sprue sprue bush is manufactured using high-quality steel T8A material, at heat
Manage quenching hardness 53HRC-57HRC.
3. a kind of phone housing injection molded method as claimed in claim 2, it is characterised in that: runner is sprue
With the coupling part of cast gate, under conditions of guaranteeing injection molding technique, the sectional area of runner be should be as small as possible, and length should be as far as possible
It is short；
The end of longer runner should open up cold slug well, and cold burden and air enter die cavity when preventing injection；
When runner is provided with the side of cover half, and extends very long from cast gate, Yao Jiashe sprue puller, convenient for cold burden when die sinking
Easily abjection；
When runner is more, Ying Jiashe spreader avoids the plastics of melting from being directly entered die cavity and go out type chamber；
When designing runner, lesser size should be selected, first in order to be repaired according to the actual situation after die trial；Runner surface
Roughness requirements reach 1.6 μm.
4. a kind of phone housing injection molded method as claimed in claim 2, it is characterised in that: cast gate is that connection shunts
The melt canal in road and type chamber, the mold use two chamber of a mould, select side gate, side gate is semi-circular shape.
5. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: the type chamber of mold is arranged
Using symmetrical, to prevent mold bears unbalance loading and generates flash, using monoblock type type chamber, size passes through following steps meter
It calculates:
The average shrinkage ratio of selected ABS material is 0.5%, just calculates the formula of mold forming component working size are as follows:
A=B+0.005B
The size of A- mold forming component at normal temperature in formula
B- plastic actual size at normal temperature
Mold manufacturing tolerance takes IT8 grades, and type core working size tolerance takes IT7 grades, and the minimum dimension of mold cavity is basic size,
Deviation is positive value；The full-size of mold cores is basic size, and deviation is negative value, and deviation of centre distance is bi-directional symmetrical distribution；
1. the radial dimension of calculating of type core:
By the radial dimension of average shrinkage ratio calculation type core:
The average shrinkage ratio for being looked into ABS known to " Design of Plastic Mould handbook " is 1.005, according to precision of plastic grade (IT8),
Radial basic size is 125.62mm, then its floating is having a size of so its floating having a size of 125.62+0.48 0
According to formula LM=[LS+SCP·LS+3 4Δ]-δ
LM=[125.62+125.62 × 1.005+3 4×0.48]- δ=Δ/3
LM=131.679-0.16
L in formulaMPart manufacturing radial dimension；
LSRadial basic size；
δ-is equal to Δ/3 for small parts, and Δ is the tolerance value that product allows；
2. the height of type core size calculates
Also carry out calculated value by shrinking percentage: at this moment providing that the nominal size HS of product hole depth is minimum dimension, deviation delta is
Overgauge, the nominal size of type core height are that HM is full-size, and deviation is minus deviation, and its basic size is 10.55mm, are floated
It is dynamic having a size of 10.55+0.92 0, ibid available type core height nominal size:
HM=[HS+SCP·HS+2 3Δ]-δ
HM=10.55-0.3
3. the radial dimension of calculating of type chamber:
Its size is also calculated by average shrinkage ratio, it is known that average shrinkage ratio S under prescribed conditionsCP=1.005, system
The nominal size of part type chamber is LM, tolerance value δ, then the average-size of type chamber are as follows: LM+δ2；In view of shrinkage and attrition value,
Its calculation formula is:
LM=[LS+LS·SCP-3 4Δ]+δ
A. when basic size is 10.55mm, value as follows can be obtained:
LM=[10.55+10.55 × 1.005-3 4×0.56]+Δ/3
LM=10.55+0.18 0
So LM=10.55+0.18 0
B. when basic size is 24mm, value as follows can be obtained:
LM=[24+24 × 1.8%-3 4×0.92]+Δ/3
LM=23.74+0.26 0
So LM=23.94+0.26 0
C. when basic size is 30mm, value as follows can be obtained:
LM=[30+30 × 1.8%-3 4×0.92]+Δ/3
LM=29.85+0.26 0
So LM=29.85+0.26 0
4. the calculating of depth of cavity size:
By the depth dimensions of average shrinkage ratio calculation type chamber, it is specified that the name of product height in the calculating of depth of cavity size
Size HSFor full-size, tolerance is indicated with minus deviation；Depth of cavity nominal size HMFor minimum dimension, tolerance is with overgauge table
Show, the bottom of type chamber or the end face of type core are parallel with die joint, wear very little abrasion loss during demoulding and just do not consider, according to public affairs
Formula
HM=[HS+HS·SCP-2 3Δ]+δ
It can obtain
A. when depth dimensions are 2mm:
HM=[2+2 × 1.8%-2 3×0.32]+0.32/3
HM=1.82+0.1 0
B. when depth dimensions are 22mm:
HM=[22+22 × 1.8%-2 3×0.92]+0.92/3
HM=21.78+0.3 0.
6. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: between the mold uses
The mode of gap exhaust.
7. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: add push rod using push plate
Ejecting mechanism demoulds plastic part smoothly；Push rod ejecting mechanism ejects BOSS column position using ejector pin, and back-off position uses
In addition 10 lifter ejections increase by two straight tops, these push rods and Zhi Ding are evenly distributed at product edges, make suffered by product
Launch force it is balanced；Push rod uses the circular cross-section push rod of shoulder form, and push rod transverse plane should not have an axial float, push rod with push away
Rod aperture is not more than flash gap used with H8/f8 or H9/f9, fit clearance is combined into, in order to avoid generating overlap, ABS plastic overflows
Material gap is 0.04~0.06mm.
8. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: the oblique top angle of mold
It is 5 °, oblique top bottom is fixed on ejector retainner plate, is moved simultaneously with ejector retainner plate, and ejecting product is used for, and completes core pulling.
9. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: the mould bases of the mold
Model are as follows: LKM CI-3540-A60-B70-C100.
10. a kind of phone housing injection molded method as described in claim 1, it is characterised in that: mold is using circulation
Water cooling mode, cooling duct setting be in convex module and female die block, cooling duct and die surface, die cavity or the mould heart away from
From that should be maintained 1~2 times of cooling channel diameter, the spacing between cooling duct should maintain 3~5 times of diameters.
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| CN113456267A (en) * | 2021-07-09 | 2021-10-01 | 上海驻净电子科技有限公司 | Flip cover structure for water adding cover of tooth flushing device and manufacturing method thereof |
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