CN105656265A - Multi-gate multi-direction injection molding of plastic product - Google Patents
Multi-gate multi-direction injection molding of plastic product Download PDFInfo
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- CN105656265A CN105656265A CN201410627316.3A CN201410627316A CN105656265A CN 105656265 A CN105656265 A CN 105656265A CN 201410627316 A CN201410627316 A CN 201410627316A CN 105656265 A CN105656265 A CN 105656265A
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Abstract
The invention relates to an injection molding method comprising the following steps: preparing an injection molding mold, wherein the injection molding mold contains a mold body and a mold cavity limited in the mold body, and through observation in six projection planes of an orthogonal space, the mold cavity is provided with gates formed in at least two mutually perpendicular projection planes; during injection molding, injecting molding plastic reinforced with glass fibers which are about 20-50% by weight percentage and are longer than 1mm into the gates simultaneously; and removing the mold after cooling, and taking out a plastic product. The invention further relates to an injection-molded product made by the method. The invention further relates to an automobile window motor assembly comprising a shell and a motor mounted inside the shell, wherein the shell is integrally injection-molded with molding plastic reinforced with glass fibers which are about 20-50% by weight percentage and are longer than 1mm, and through observation in six projection planes of an orthogonal space, the shell is provided with gate marks in at least two mutually perpendicular projection planes.
Description
Technical field
The present invention relates to the multi-direction injection molding forming method of many cast gates of plastics, device and the plastics being made up of described method, device, especially Car window electric machine housing.
Background technology
In current society, plastics are extensively for all trades and professions. In automobile manufacturing field, a large amount of employing relevant components and parts of plastic casing encapsulation. For Car window electric machine assembly, they motor and relevant control components and parts of comprising motor plastic casing and being installed on described electric machine casing.
Usually adopt injection molding mode to manufacture plastics, principle be the fusing point according to different sorts plastics first by plastic molting, by being injected in injection forming mold with certain speed after the pressurization of injection moulding machine, then cooling the demoulding. Also for Car window electric machine housing, the injecting forming material extensively adopted at present is PBT-GF30 (that is, the polybutylene terephthalate that 30% glass fibre is strengthened), and price is relatively costly. At present, industry field also extensively adopts another kind of plastics PP-GF40 (that is, the polypropylene that 40% glass fibre is strengthened) to manufacture injection-molded item.
PBT-GF30 is the plastics that a kind of short glass fiber is strengthened, and its glass fibre length is tens microns and weight percent is 30%. PP-GF40 is the plastics that a kind of long glass fibres is strengthened, and its glass fibre length is more than 1 millimeter and weight percent is 40%. Long glass fibres is compared with short glass fiber, and the strengthening effect of plastics is more excellent, but shortcoming is plastics is easy to warpage. In addition, compared with PBT-GF30, PP-GF40 is more cheap, facilitates batch production to reduce costs. But, according to the parts that PP-GF40 manufactures the thinner such as Car window electric machine housing of wall thickness, then warpage easily occurs, causes scrap rate to raise.
Summary of the invention
For above problem, the plastics that the present invention is intended to design the injection moulding method improved or device is strengthened to utilize price long glass fibres inexpensively manufacture injection-molded item. It is to be noted in the context of the present invention, long glass fibres refers to the glass fibre of length more than 1 millimeter.
According to an aspect of the present invention, it is proposed that a kind of injection molding forming method, comprising:
Preparing an injection forming mold, described injection forming mold comprises:
Die ontology; And
The die cavity limited in described die ontology, wherein, observes in six projection planes of orthogonal intersection space, and described die cavity is formed with cast gate at least two orthogonal projection planes;
When injection molding, it is that the moulding plastics of the glass fibre reinforcement of more than the 1 millimeter length of 20% to 50% is injected in described cast gate simultaneously by weight percent;
Demolding after cooling, takes out plastics.
Can selection of land, described cast gate quantity is at least two.
Can selection of land, described formed material be strengthen glass fibre weight percent be the polypropylene of 40% to 45%.
Can selection of land, described cast gate is sprue or oblique cast gate.
Can selection of land, in the projection plane forming cast gate, cast gate quantity is at least two and separate each other.
According to another aspect of the present invention, it provides a kind of Car window electric machine assembly, it comprises
Housing; And
It is installed on the motor of described housing, wherein said housing is the housing of the moulding plastics integral injection molding of the glass fibre reinforcement of more than the 1 millimeter length utilizing weight percent to be 20% to 50%, wherein, observing in six projection planes of orthogonal intersection space, described housing has gate vestiges at least two orthogonal projection planes.
Can selection of land, the second section of transmission parts that described housing comprises the first part for installing described motor and is connected with described motor operation for installing, plane is projected from one, at least one gate vestiges is positioned on the outside surface of described first part, from another projection plane, at least another gate vestiges is positioned on the outside surface of described second section.
Can selection of land, position residing for described gate vestiges is the position that described housing wall thickness is relatively thick.
Can selection of land, described moulding plastics be strengthen glass fibre weight percent be the polypropylene of 40% to 45%.
According to another aspect of the present invention, additionally providing a kind of plastics, described plastics utilize aforesaid injection molding forming method to be obtained, wherein, observing in six projection planes of orthogonal intersection space, described plastics have gate vestiges at least two orthogonal projection planes.
Adopt the technical scheme of the present invention, plastics inexpensively, such as PP-GF40 can be utilized to manufacture Car window electric machine housing, reduce manufacturing cost, simultaneously not only provide higher physical strength for Car window electric machine housing but also avoid the incidence of warping phenomenon in injection molding as far as possible.
Accompanying drawing explanation
From detailed explanation described later and combine below accompanying drawing can more fully understand the aforementioned of the present invention and other side. It is noted that the ratio of each accompanying drawing is likely different for the object clearly demonstrated, but this can't affect the understanding of the present invention. In the accompanying drawings:
Fig. 1 carries out the schematic diagram of the plate product model of computer aided design (CAD) according to the present invention;
Fig. 2 is schematic perspective view, shows the moulded products of the embodiment that the multi-direction injection molding technology of the many cast gates according to the present invention manufactures;
Fig. 3 is schematic perspective view, shows the moulded products of another embodiment that the multi-direction injection molding technology of the many cast gates according to the present invention manufactures;
Fig. 4 is schematic perspective view, shows the Car window electric machine housing of another embodiment that the multi-direction injection molding technology of the many cast gates according to the present invention manufactures;And
Fig. 5 is schematic perspective view, shows the Car window electric machine housing of another embodiment that the multi-direction injection molding technology of the many cast gates according to the present invention manufactures.
Embodiment
In each accompanying drawing of the application, structure is identical or intimate feature is represented by identical Reference numeral.
In order to the process of injection molding of analyzing plastics goods, below introduce and utilize MoldflowMPI software that one flat board as shown in Figure 1 is carried out CAE (computer aided design (CAD)) modeling analysis.
For the ease of modeling, a kind of plastics PA66/GF that the plate product 1 shown in Fig. 1 is produced taking DuPont is as modeling material, and it is square, and length of side 200mm and thickness are 2.5mm.
Sprue for the injection forming mold of this plate product 1 is arranged on central point O place as shown in Figure 1. In CAE modeling analysis, be set to inject time 2.2 seconds, injection pressure be set to 70MPa, molding time be 35 seconds, the dwell time be 10 seconds, die sinking get the goods time be 5 seconds, dwell pressure be 56MPa.
Each angle point and Ge Bian mid point of flat plate model 1 arrange control point A respectively1��A2��A3��A4And B1��B2��B3��B4, detect the buckling deformation amount along Z direction of principal axis. The buckling deformation amount of plate product 1 arranges in following table 1.
Table 1: the buckling deformation result of plate product 1
Wherein: 1) 4 angle point A on Z direction of principal axisi(i=1,2,3,4) maximum buckling deformation amount;
2) Z direction of principal axis top mid point Bi(i=1,2,3,4) maximum buckling deformation amount;
3) the buckling deformation amount at cast gate O place on Z direction of principal axis;
4) the maximum relative buckling deformation amount on Z direction of principal axis.
As can be seen from Table 1, the downward warpage of plate product 1 injection molding posterior border, but mid point BiDistortion be greater than angle point Ai; Center line B1B3Length be less than sideline A1A2. This illustrate the edge of goods 1 to while recessed also to contract, form a three-dimensional space curve. The upturned distortion in cast gate O place 6.602mm, limit mid point BiMaximum downward buckling deformation 3.540mm, thus its relative maximum buckling deformation amount is 10.142mm. This shows, buckling deformation amount during PA66 injection molding is sizable.
Injection moulded products occurs that the major cause of buckling deformation roughly has three: the even property of Contractive Nonuniformity, orientation ununiformity and inhomogeneous cooling. Utilize more than the cae analysis of MoldflowMPI software three kinds of reasons can obtain the respective sensitivity factor (see table 2) relevant to the appearance of warping phenomenon.
Table 2 produces the reason of buckling deformation
During injection molding, the mobility of PA66 is mainly subject to the impact of glass fibre bigger. Can significantly finding out from upper table 2, the sensitivity factor caused due to the flow orientation ununiformity of PA66 is owing to shrinking uneven caused 391 times, is due to even caused 2840 times of inhomogeneous cooling. At this, " flow orientation is uneven " refers to the direction non-uniform Distribution of the formed material of flowing when injection molding. The flow direction more non-homogeneous (disorderly and unsystematic or unordered) of formed material when if the uneven sensitivity factor height of orientation refers to injection molding, the probability that warpage occurs is more little. This shows, for the molded plastic article of PA66, the major determinant of the buckling deformation of its molded plastic article be glass fibre flow time orientation unreasonable caused by. That is, if fundamentally to be suppressed the buckling deformation of plastics, it should realize from the flow orientation changing glass fibre.
For PP-GF40 conventional in injection molding, its glass fibre is longer than the glass fibre of PA66/GF, and the impact that therefore mobility causes should be more obvious than PA66/GF.That is, the flow orientation of above-mentioned change glass fibre suppresses the conclusion of the buckling deformation of plastics will be more applicable for PP-GF40.
As can be seen from Table 2, in the sensitivity factor relevant to the appearance of warping phenomenon, orientation is uneven is topmost factor. The mobility orientation changing glass fibre mainly can realize in the following manner: optimizes injection technological parameter, changes the thickness of injection moulded products and improve cast gate. Although the such as optimization of the injection technological parameter of die temperature, melt temperature, pressurize mode and cooling conditions etc. is simple, economical and convenient, but often effect is not direct. The thickness of change goods often needs to change design process and the mould structure of goods, and some goods has strict requirement in shape, size, and thickness can not at will be changed, and therefore also has certain limitation.
Therefore, suppress the appearance of warping phenomenon will be a kind of effective measure by improving the design of cast gate. During in order to make injection molding, the flow direction of formed material can be more disorderly and more unsystematic or unordered, the present inventor expects the cast gate quantity increase of mould can being increased the cast gate along different directions simultaneously, like this by by formed material from different directions and multiple cast gate be injected in mould simultaneously, can effectively change the flow orientation of formed material, and then suppress the generation of warping phenomenon.
The multi-direction injection molding technology of many cast gates according to the present invention will be briefly introduced below. But, it should be noted that the basic ideas of technology are only described by the present invention, and not for any concrete mould. It should be apparent to those skilled in the art that after the process of injection molding having understood relevant injection moulded products, how to design corresponding injection forming mold.
Fig. 2 shows the injection moulded products 2 of the embodiment adopting the multi-direction injection molding technology of many cast gates according to the present invention to make. This injection moulded products 2 can be common upper plastic cover, is made up of PA-GF40 material injection molding. In fig. 2, refer to for the gate vestiges on injection molding goods 2 by Reference numeral 10a and 10b. In other words, Reference numeral 10a and 10b can also think the cast gate referred in the generation injection forming mold corresponding with goods 2. For the Reference numeral in other accompanying drawing finger for principle and this roughly the same.
As can be seen from Figure 2, it is respectively arranged with cast gate 10b and 10a along Y-direction and Z-direction for these goods 2, the PA-GF40 of the melting when injection molding is injected in the die cavity of forming mould along orthogonal Z and Y-direction like this, the flowing of the injection material in these two directions can change the flow orientation of mould inside, thus suppresses the generation of warping phenomenon.
In order to increase the effect that the flow orientation on injection material affects, Fig. 3 shows the injection moulded products 3 of another embodiment adopting the multi-direction injection molding technology of many cast gates according to the present invention to make. With Fig. 2 the difference is that, the injection forming mold relevant to this injection moulded products 3 has set up in X direction a cast gate 10c. Like this, when injection molding, the PA-GF40 of melting can be injected in the die cavity of injection forming mold along three direction X, Y and Z vertical each other, the flow orientation of mould inside can be changed more efficiently, that is injecting forming material can be caused to flow more disorderly at mould inside, suppress the generation of warping phenomenon with this.
It should be appreciated that be only provided with a cast gate along direction X, Y or a Z in the embodiment of Fig. 2 and Fig. 3. But, in order to strengthen the effect of injecting forming material in the unordered flowing of mould inside, in each direction or one or two optional direction can arrange the two or more cast gates being spaced apart from each other, can improve like this and strengthen injecting forming material at the unordered flow effect of mould inside, strengthen the impact of injection molding orientation ununiformity.
Fig. 4 shows the Car window electric machine housing 4 of another embodiment adopting the multi-direction injection molding technology of many cast gates according to the present invention to make. Car window electric machine housing 4 comprises first part and second section substantially, the former is for the motor of Car window electric machine assembly unshowned in installation plan, the latter is used for unshowned and described motor operation is connected in installation plan transmission parts, such as worm gear-endless screw assembly, the worm screw that the output shaft of wherein said motor is connected in described worm gear-endless screw assembly, and drive it to rotate as required. Usually, the cast gate of this kind of electric machine casing is arranged on 11b place, is namely arranged on the outside surface of second section. But, different from tradition, according to present invention employs two cast gate 11a and 11b along a Z-direction setting and cast gate 11c along Y-direction setting. As shown in Figure 4, described two cast gate 11a and 11b are positioned on the second section of Car window electric machine housing 4, are especially positioned on the outside surface of second section, and described cast gate 11c is positioned in the first part of Car window electric machine housing 4, is especially positioned on the sidewall of first part. Like this, cast gate 11a and 11c that Z and Y-direction respectively set up will booster shots shaping time injecting forming material unordered flowing, change orientation ununiformity. Preferably, position residing for cast gate is the position that the wall thickness of Car window electric machine housing 4 is relatively thick.
Fig. 5 shows the Car window electric machine housing 5 of another embodiment adopting the multi-direction injection molding technology of many cast gates according to the present invention to make. This Car window electric machine housing 5 also comprises first part and second section substantially. Described first and second parts are identical with the first and second partial actions of above-mentioned Car window electric machine housing 4. With Fig. 4 the difference is that, a cast gate 11d set up in the X direction by the forming mould corresponding with this electric machine casing 5. This cast gate 11d is positioned on the end face of the sidewall in another direction of the first part of Car window electric machine housing 4. Like this, all there is formed material to be expelled in mould inside during injection molding in three different directions, strengthen the unordered flowing of formed material further with this, increase the impact that injection molding is caused by orientation ununiformity, suppress the appearance of warping phenomenon.
Although above-described embodiment describes the die design adding cast gate along three vertical each other directions, but it should be apparent to those skilled in the art that, depending on that structure design restriction and the flow orientation of concrete injection moulded products change the other factorses such as requirement, cast gate can also be set up along the direction of mutual non-vertical. In addition, it should be clear that although the ununiformity that cast gate quantity arranges more flow orientation at most in one direction will be more obvious, but this also can increase the design difficulty of mould, it is thus desirable to according to the shape of concrete injection moulded products and require direction and the quantity of determining cast gate. In addition, cast gate mentioned by the present invention can be sprue or oblique cast gate.
The plastics that the multi-direction injection molding technology of cast gate more than this kind of the present invention is applicable to utilize any long glass fibres to strengthen are to manufacture injection molded article, and plastic type is not limited to PP, and the plastics of other kind also may be used.In addition, in the application documents of the present invention, long glass fibres refers to the glass fibre of length more than 1 millimeter; The weight percent of glass fibre can be between 20% and 50%.
Above-mentioned thinking according to the present invention can propose a kind of injection forming mold, comprising:
Die ontology; And
The die cavity limited in described die ontology, wherein, six projection planes of orthogonal intersection space are observed, described die cavity is formed with cast gate at least two orthogonal projection planes, when injection molding, it is that the moulding plastics of the glass fibre reinforcement of more than the 1 millimeter length of 20% to 50% is injected in described cast gate simultaneously by weight percent.
In the context of the present invention, six projection planes of above-mentioned orthogonal intersection space refer to the projection plane relative to+X ,-X ,+Y ,-Y ,+Z and-Z orthogonal directions respectively as shown in Fig. 2 to 5. Just in other words, also from the projection plane observed by front and back, left and right, up and down direction.
Again such as, it is proposed according to the present invention to a kind of injection molding forming method, comprising:
Prepare above-mentioned injection forming mold;
By weight percent be 20% to 50% more than 1 millimeter length glass fibre strengthen moulding plastics fusing pressurization be injected in the cast gate of injection forming mold; And
Demolding after cooling, takes out plastics.
Finally, the present invention proposes the plastics that the moulding plastics of the glass fibre reinforcement of more than the 1 millimeter length by weight percent being 20% to 50% adopts above-mentioned injection molding forming method to obtain, wherein, observing in six projection planes of orthogonal intersection space, described plastics have gate vestiges at least two orthogonal projection planes.
Specifically, more such as, the present invention proposes a kind of Car window electric machine assembly, comprising:
Housing; And
The motor installed in described housing, wherein, the moulding plastics that described housing is the glass fibre reinforcement of more than the 1 millimeter length of 20% to 50% by weight percent adopts above-mentioned injection molding forming method to obtain.
Technical scheme according to the present invention, become there is cast gate at least two projection planes by injection molding die design, when injection molding, formed material can flow more disorderly at mould inside like this, add the impact that orientation ununiformity causes, thus inhibit the appearance of warping phenomenon in injection molding finished product. Therefore, the goods adopting the relatively cheap plastics of price to manufacture can have the similar low warping characteristic of goods that the plastics relatively costly with adopting price manufacture. Specifically for the injection molding of Car window electric machine housing, adopt relatively cheap PP-GF40 can substitute PBT-GF30 and manufacture the product that intensity is higher and warpage occurrence rate is lower, significantly reduce the manufacturing cost of manufacturing enterprise.
The main advantage of the technical scheme of the present invention is, by injection molding mould to be added as required the innovative approach of the cast gate of different amts at multiple different directions, the mobility of formed material in injection forming mold when can improve injection molding significantly, the appearance of warping phenomenon is suppressed, for injection molding die design proposes new design improved though with this.
Although describing the particular implementation of the present invention here in detail, but the object that they are only used to explain provides, and should not think that the scope of the present invention is construed as limiting by they. Without departing from the spirit and scope of the present invention, various replacement, change and transformation can be conceived out.
Claims (10)
1. an injection molding forming method, comprising:
Preparing an injection forming mold, described injection forming mold comprises:
Die ontology;And
The die cavity limited in described die ontology, wherein, observes in six projection planes of orthogonal intersection space, and described die cavity is formed with cast gate at least two orthogonal projection planes;
When injection molding, it is that the moulding plastics of the glass fibre reinforcement of more than the 1 millimeter length of 20% to 50% is injected in described cast gate simultaneously by weight percent;
Demolding after cooling, takes out plastics.
2. injection molding forming method according to claim 1, it is characterised in that, described cast gate quantity is at least two.
3. injection molding forming method according to claim 1 and 2, it is characterised in that, described formed material is reinforcement glass fibre weight percent is the polypropylene of 40% to 45%.
4. injection molding forming method according to claim 1 and 2, it is characterised in that, described cast gate is sprue or oblique cast gate.
5. injection molding forming method according to claim 1 and 2, it is characterised in that, in the projection plane forming cast gate, cast gate quantity is at least two and separates each other.
6. a Car window electric machine assembly, it comprises
Housing; And
It is installed on the motor of described housing, wherein said housing is the housing of the moulding plastics integral injection molding of the glass fibre reinforcement of more than the 1 millimeter length utilizing weight percent to be 20% to 50%, wherein, observing in six projection planes of orthogonal intersection space, described housing has gate vestiges at least two orthogonal projection planes.
7. Car window electric machine assembly according to claim 6, it is characterized in that, the second section of transmission parts that described housing comprises the first part for installing described motor and is connected with described motor operation for installing, plane is projected from one, at least one gate vestiges is positioned on the outside surface of described first part, from another projection plane, at least another gate vestiges is positioned on the outside surface of described second section.
8. Car window electric machine assembly according to claim 7, it is characterised in that, position residing for described gate vestiges is the position that described housing wall thickness is relatively thick.
9. Car window electric machine assembly according to claim 6 or 7, it is characterised in that, described moulding plastics is that to strengthen glass fibre weight percent be the polypropylene of 40% to 45%.
10. plastics, described plastics utilize the arbitrary described injection molding forming method of claim 1 to 5 to be obtained, wherein, observing in six projection planes of orthogonal intersection space, described plastics have gate vestiges at least two orthogonal projection planes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410627316.3A CN105656265A (en) | 2014-11-10 | 2014-11-10 | Multi-gate multi-direction injection molding of plastic product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410627316.3A CN105656265A (en) | 2014-11-10 | 2014-11-10 | Multi-gate multi-direction injection molding of plastic product |
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| CN105656265A true CN105656265A (en) | 2016-06-08 |
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| CN201410627316.3A Pending CN105656265A (en) | 2014-11-10 | 2014-11-10 | Multi-gate multi-direction injection molding of plastic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704196A (en) * | 2017-01-23 | 2017-05-24 | 世特科汽车工程产品（常州）有限公司 | Vacuum pump blade and manufacturing method and device |
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| CN1734138A (en) * | 2004-08-02 | 2006-02-15 | 张昆 | Pressure container, method and apparatus for processing fiber reinforced polymer for composing the pressure container |
| CN101768360A (en) * | 2009-12-30 | 2010-07-07 | 四川得阳化学有限公司 | Technique for manufacturing pneumatic wing plate for bridge |
| CN102731912A (en) * | 2012-07-13 | 2012-10-17 | 北京汽车股份有限公司 | Preparation method of foglight shell of passenger car |
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- 2014-11-10 CN CN201410627316.3A patent/CN105656265A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426347A (en) * | 2000-02-24 | 2003-06-25 | 东丽株式会社 | FRP molded article and method of producing same |
| CN1734138A (en) * | 2004-08-02 | 2006-02-15 | 张昆 | Pressure container, method and apparatus for processing fiber reinforced polymer for composing the pressure container |
| CN101768360A (en) * | 2009-12-30 | 2010-07-07 | 四川得阳化学有限公司 | Technique for manufacturing pneumatic wing plate for bridge |
| CN102731912A (en) * | 2012-07-13 | 2012-10-17 | 北京汽车股份有限公司 | Preparation method of foglight shell of passenger car |
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| CN106704196A (en) * | 2017-01-23 | 2017-05-24 | 世特科汽车工程产品（常州）有限公司 | Vacuum pump blade and manufacturing method and device |
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Application publication date: 20160608 |