CN102248648A - Determination method for deformation part of resin molded product and bad deformation suppression method - Google Patents
Determination method for deformation part of resin molded product and bad deformation suppression method Download PDFInfo
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- CN102248648A CN102248648A CN2011101296466A CN201110129646A CN102248648A CN 102248648 A CN102248648 A CN 102248648A CN 2011101296466 A CN2011101296466 A CN 2011101296466A CN 201110129646 A CN201110129646 A CN 201110129646A CN 102248648 A CN102248648 A CN 102248648A
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Abstract
The invention provides a determination method for the deformation part of a resin molded product and a bad deformation suppression method. According to the determination method, a shrinkage area on the surface of the resin molded product can be easily determined and the shrinkage can be the reason for the bad deformation of the resin molded product after being taken out of a die. According to the suppression method, a proper molding condition is determined according to the shrinkage condition of the area so as to suppress the bad deformation. The method comprises the steps of deriving the shrinkage distribution according to the displacement amount distribution on the surface of the resin molded product and setting the area with a larger shrinkage rate to be the area with a bad deformation according to the shrinkage distribution. By adopting the above method, the region wherein a bad deformation will occur can be determined.
Description
Technical field
The present invention relates to produce on a kind of definite synthetic resin surface the method in the zone of shrinking, this contraction can become from mould takes out the bad reason of distortion that takes place behind the resin forming product; Be used to suppress to take out from mould after the bad bad inhibition method of distortion of distortion of synthetic resin.
Background technology
Synthetic resin owing to have does not have the such burn into cheapness of metal, timber and the feature of lightweight, therefore, is used to various fields.In addition, in order to save earth resource by recirculation, the major part of synthetic resin is formed by thermoplastic resin.And, owing to can use various forming methods such as compression forming, transfer molding, injection moulding, extrusion molding, blow molding, and the progress of make-up machine and mould structure, thereby the also moulding easily of synthetic resin of complicated shape made.
Particularly the manufacturing by injection molding synthetic resin has the advantages such as product that productivity ratio is good, can be shaped to complicated shape easily, therefore, carries out in the scope of the broadness of product from industrial products to the sundry goods.
Just the temperature of the synthetic resin that takes out from die for injection molding is very high.Synthetic resin is cooled after taking-up, but because the variations in temperature from this condition of high temperature to low-temperature condition, synthetic resin deforms.The distortion of this synthetic resin is not to be that moulding product integral body as one man is out of shape.Therefore, can be in synthetic resin produce problems such as buckling deformation (below, be sometimes referred to as the bad problem of distortion).
Bad and carry out the deformation analysis of synthetic resin in order to reduce this distortion.Specifically, according to characteristic (rerum natura) of the resin material of condition of molding, make-up machine, use etc., utilize analysis software analysis (patent documentation 1) by the design shape model of resin forming portion product.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2007-71674 communique
Summary of the invention
The problem that invention will solve
Even if carry out existing deformation analysis, also can't determine to become the position of the bad reason of distortion, the very time-consuming and time when the condition of molding that decision is fit to as record in the patent documentation 1.
The present invention finishes in order to address the above problem, its purpose is, the method of determining to produce the zone of shrinking easily on the synthetic resin surface is provided, this contraction can become from mould takes out the bad reason of distortion behind the synthetic resin, and provide contraction behavior to decide suitable condition of molding, thereby suppress the bad method of distortion according to determined zone.
The scheme that is used to deal with problems
The inventor etc. further investigate repeatedly in order to overcome the above problems.It found that, so long as possess the method for following operation, that is: derives the operation of the distribution of shrinkage factor according to the distribution of the displacement on the synthetic resin surface after taking out from mould; With, according to the distribution of above-mentioned shrinkage factor, big zone around the shrinkage ratio is defined as the method for operation in zone that generation can become the contraction of distortion poor prognostic cause, then solve the problems referred to above, thereby finished the present invention.More particularly, the invention provides following technical scheme.
(1) a kind of definite method of being out of shape poor prognostic cause, this method possesses: the operation of the distribution of shrinkage factor is derived in the distribution according to the displacement on the synthetic resin surface after taking out from mould; With, according to the distribution of described shrinkage factor, big zone around the shrinkage ratio is defined as the operation that generation can become the zone of the contraction of being out of shape poor prognostic cause.
(2) according to definite method of (1) described distortion poor prognostic cause, wherein, the zone that aforementioned shrinkage factor is big is the zone of shrinkage factor maximum.
(3) the bad inhibition method of a kind of distortion, it is the bad bad inhibition method of distortion of distortion of the synthetic resin after inhibition is taken out from mould, this method possesses: the operation of the distribution of the shrinkage factor on the synthetic resin surface after derivation is taken out from mould; With, according to the distribution of aforementioned shrinkage factor, big zone around the shrinkage ratio is defined as the operation that generation can become the zone of the contraction of being out of shape poor prognostic cause; With, the operation of the condition of molding of the shrinkage factor in the zone that the described shrinkage factor of decision inhibition is big.
(4) according to the bad inhibition method of (3) described distortion, wherein, the zone that aforementioned shrinkage factor is big is the zone of shrinkage factor maximum.
The invention effect
According to the present invention, can easily determine on the synthetic resin surface, to produce the zone of shrinking, described contraction can become from mould takes out the bad reason of distortion that takes place behind the synthetic resin.Owing to determining that so easily generation can become the position of the contraction of the bad reason of distortion, thereby inhibition can become such condition of molding that the amount of contraction in the zone of the bad reason of distortion changes and also can easily determine, can suppress to be out of shape bad thus easily.
Description of drawings
(a) of Fig. 1 is for illustrating the figure of the flaky resin moulding product with irregular spot pattern; (b) be the figure of the state in a plurality of zones for the surface segmentation that will have the synthetic resin of irregular spot pattern is shown; (c) be the figure of enlarged drawing of a part that a plurality of zones shown in (b) are shown.
(a) of Fig. 2 is for illustrating the figure of mode that measures the distortion of synthetic resin by filming apparatus; (b) for the figure of the synthetic resin after the distortion is shown; (c) for the figure of the enlarged drawing that is out of shape preceding synthetic resin is shown; (d) be the figure of enlarged drawing that the synthetic resin after the distortion is shown.
Fig. 3 is the figure that the synthetic resin that uses among the embodiment 1 is shown.
Fig. 4 is the figure of shrinkage factor distribution results that the synthetic resin of embodiment 1 is shown.
Fig. 5 is the figure of deformation state that the synthetic resin of embodiment 1 is shown.
Description of reference numerals
1,2: synthetic resin
11: the spot pattern
12: the zone
3: filming apparatus
The specific embodiment
Below, embodiments of the present invention are elaborated, but the present invention is not subjected to any restriction of following embodiment, can be in the scope of the object of the invention in addition suitably change implement.In addition, the repetition part is arranged, suitably omitted explanation sometimes, but be not that the purport of inventing is limited for explanation.
Definite method of distortion poor prognostic cause
Definite method of distortion poor prognostic cause of the present invention possesses: the operation (below, be sometimes referred to as " first operation ") that derives the distribution of shrinkage factor according to the distribution of the displacement on the synthetic resin surface after taking out from mould; With, according to the distribution of aforementioned shrinkage factor, big zone around the shrinkage ratio is defined as the operation (below, be sometimes referred to as " second operation ") in zone that generation can become the contraction of distortion poor prognostic cause.Below, each operation is described.
First operation
First operation is following operation: the surface of synthetic resin is divided into a plurality of zones, measures the operation that shrinkage factor distributes according to each regional displacement after taking out synthetic resin from mould.
The resin material that is used for the synthetic resin moulding is not particularly limited, can uses existing known resin material.In addition, the resin compound that the various kinds of resin material is mixed also belongs to above-mentioned resin material.And then, comprise that also adding additives such as pigment, antioxidant, stabilizing agent, plasticizer, lubricant, releasing agent and fire retardant such as nucleator, carbon black, inorganic sintered pigment to resin gives the resin material of desired characteristic.
Shape to synthetic resin also is not particularly limited, to all applicable the present invention of the synthetic resin of Any shape.In the present invention as the bad problem that becomes easily when the moulding product uneven thickness of the distortion such as buckling deformation that improve target.This is because in same moulding product, the moulding product of uneven thickness have heavy section and thinner wall section, the different deformational behavior of easy generation in heavy section and thinner wall section.The present invention is best suited for the distortion of the moulding product that improve this wall unevenness is bad.
Below, an example of the derivation that shrinkage factor is distributed describes.For example, the shrinkage factor Determination of distribution can be undertaken by following method.
The surface that possesses the synthetic resin of irregular pattern can be divided into a plurality of zones, and measure each interregional displacement as a style by the distortion of each regional style, and derive the shrinkage factor distribution according to this displacement with a zone.
As " irregular pattern ", can list irregular spot pattern, striated pattern, marble pattern, hide-like pattern etc.In addition, pattern can be any of plane pattern, 3 D pattern.In addition, the method for mark pattern is not particularly limited, can enumerates method by sprayer mark pattern etc.
By scheming to come " being divided into a plurality of zones " described.(a) of Fig. 1 shows the synthetic resin 1 of sheet, and this synthetic resin 1 has spot pattern 11.The surface that (b) of Fig. 1 shows the synthetic resin 1 of sheet is divided into a plurality of modes of regional 12.
" style in a zone " is meant: like that, the spot pattern 11 in each zone 12 is being considered as respectively under the situation of a style as a whole shown in Fig. 1 (c), divided each zone 12 all is recognized as different styles basically.That is, shown in Fig. 1 (c), refer to that the style of regional A is all different with the style of area B, C, D.
Then, the mensuration to displacement describes.As described below, can be by obtaining the distribution that displacement is derived displacement in a plurality of zones.And can be distributed by the displacement of being derived derives the shrinkage factor distribution.The mensuration of displacement can be by the derivation such as displacement of the displacement between the style of above-mentioned zone, style.Assay method to displacement is not particularly limited, preferably, make synthetic resin not with measure utensil etc. and measure contiguously.This is because make synthetic resin and mensuration utensil when contacting, because of the influence of the binding agent that is used to contact etc. can't accurately be measured deflection sometimes.
The method of measuring displacement non-contiguously is not particularly limited, and the (a) and (b) of Fig. 2 show an example of the method for measuring displacement non-contiguously.
(a) of Fig. 2 shows the mode of taking the synthetic resin 2 with irregular spot pattern by filming apparatus 3.Synthetic resin 2 shown in Fig. 2 (a) is just states from almost not shrinking after mould takes out.Filming apparatus 3 is the devices that are used to measure displacement, preferably, uses the method for filming apparatus mensuration displacements such as CCD camera like this.This be because, if use the method for filming apparatus such as CCD camera, then measure displacement easily exactly, and then, can easily measure big displacement by the shooting area that enlarges camera, in addition, by the coverage of amplifying camera, also can easily measure little displacement with the multiplying power of regulation.That is,, also can measure displacement several times, distribute thereby derive whole displacement easily and exactly by bust shot scope, branch even under the little situation of displacement.Its result also can be easily and obtain shrinkage factor exactly and distribute.
(b) of Fig. 2 shows from mould taking-up back owing to the synthetic resin 2 that cools off after shrinking.Shrink Δ X, shrink Δ Y along directions X as a whole along the Y direction.During the contraction basically identical of synthetic resin 2 integral body, the displacement of obtaining big zone like this gets final product, but in fact, in synthetic resin, displacement, deformation direction are that situation miscellaneous is very many.
(c) of Fig. 2 and the same figure of Fig. 1 (c) show the enlarged drawing that is out of shape preceding synthetic resin.That is, Fig. 2 (c) illustrates just from the state that does not almost shrink after mould takes out.(d) of Fig. 2 illustrate from mould take out the back because of cooling after shrinking, with the enlarged drawing of the synthetic resin of (c) same position of Fig. 2.
Shown in Fig. 2 (c), the distance of shrinking (between area B and the zone C) between preceding adjacent area is X
AShown in Fig. 2 (d), the distance of shrinking between the above-mentioned zone of back becomes X
A'.This moment, displacement was (X
A-X
A'), shrinkage factor is { (X
A-X
A')/X
A} * 100 (%).Each interregional shrinkage factor is also carried out same mensuration, can derive shrinkage factor thus and distribute.
In addition, when deriving the shrinkage factor distribution, be not limited to the method for the interregional distance of above-mentioned this use.In addition, being divided into above-mentioned this tiny zone is in order to measure local displacement, so long as measure the method for the displacement on local synthetic resin surface, just can preferably to adopt any method.
In addition, to the also applicable the present invention of the synthetic resin that does not have pattern.Do not have at synthetic resin under the situation of pattern, need be after moulding the mark pattern.Owing to after mould takes out, begin immediately to shrink, thus preferred in mould with moulding simultaneously the mark pattern method, from immediately synthetic resin being carried out the method for pattern mark after mould takes out.
In addition, if with the zone set for can the identification pattern pattern, just can analyze.Therefore, even if spot is bigger, as long as correspondingly the zone is set no problemly.Therefore, the size of optimal pattern changes according to the size in zone.That is, come setting regions according to the size of spot.In addition, the surface by cutting apart synthetic resin also is divided into a plurality of zones shortening interregional distance, thereby can measure more accurately.When filming apparatus such as using the CCD camera is measured, take, change to the camera of high pixel etc. by the bust shot zone, interregional distance can be shortened, thereby high-precision mensuration can be carried out.
The mark that above-mentioned this use CCD camera carries out the mensuration of deflection of spot pattern, for example can use Digital 3D-Correlation System VIC-3D (manufacturing of Correlated Solutions company) to carry out.
Second operation
In second operation, distribute, big zone around the shrinkage ratio is defined as the zone that generation can become the contraction of distortion poor prognostic cause according to the shrinkage factor that derives in above-mentioned first operation.When having bigger position, shrinkage factor part, this place becomes the bad reason of distortion.Its distortion of position that shrinkage factor is big may not be big, but according to first operation of the present invention, can easily determine to become the bigger position, shrinkage factor part of distortion poor prognostic cause.
In addition, shrinkage factor becomes maximum zone and becomes the bad bigger reason of distortion easily, and according to the present invention, also can easily determine the position of shrinkage factor maximum.
The bad inhibition method of＜distortion 〉
In the bad inhibition method of distortion of the present invention, the molding condition that shrink the big position of the local change of shrinkage factor that the meeting of derivation suppresses to be confirmed by above-mentioned shrinkage factor distribution.Decide condition of molding according to local position, the displacement that becomes big part of shrinkage factor.Here, condition of molding also comprises the condition of the shape of synthetic resin except general condition of molding such as imposing a condition of shaped device.
For example, under situation that will not have the synthetic resin that the potting resin forming materials forms, the shape of synthetic resin (position of heavy section, thinner wall section, the ratio of thinner wall section), the Temperature Distribution in mould, pressure distribution have considerable influence to the distortion such as warpage of synthetic resin.Therefore, particularly under the situation of no potting resin material, study, can suppress the distortion of synthetic resin by shape to synthetic resin.In addition, no potting resin material is meant: do not contain glass fibre etc. and strengthen resin material with inorganic filler.
In order to eliminate distortion such as the warpage that taken place in the synthetic resin that above-mentioned no potting resin forming materials is formed during the shape of research synthetic resin, as long as carry out the position that shrinkage factor is big become thin-walled more, position that shrinkage factor is big around become heavy wall more, the change of the molding conditions such as change the only cooling of mould strengthened in the big position of shrinkage factor, then have the bad tendency of the distortion eliminated.
In addition, it is bad can not eliminate distortion sometimes by condition of molding change once.This is because eliminate a bad reason of distortion under a lot of situations and can not be reacted to integral body.Therefore, by carrying out the change of condition of molding for several times, big position, the displacement of the local change of shrinkage factor investigated suitable condition of molding from each moulding product, thereby can easily determine not produce the bad condition of molding of distortion.
Embodiment
Below, enumerating embodiment and further describe the present invention, the present invention is not limited to these embodiment.
Resin material
There is not polyacetal resin: the Duracon M90-44 (Polyplastics Co., Ltd.'s manufacturing) of filling
Make such shape shown in Figure 3, the synthetic resin of size by injection moulding.After taking out above-mentioned synthetic resin in 5 seconds from mould, to synthetic resin spraying pigment inks, and to the irregular spot pattern of surface markers of synthetic resin.
Use Digital 3D-Correlation System VIC-3D (manufacturing of Correlated Solutions company), the synthetic resin surface is divided into a plurality of zones, and use the displacement of this a plurality of area tests part, derivation shrinkage factor to distribute.Minute is to take out behind the synthetic resin 5 minutes from mould.In addition, owing to can be divided into a plurality of zones the surperficial moment of synthetic resin, and can begin the mensuration of deflection when being divided into a plurality of zones, therefore, substantial minute is behind the mark pattern 5 minutes.
The shrinkage factor distribution that obtains as mentioned above is shown in Fig. 4 (a).And then will show (a) that be illustrated in Fig. 5 of actual deformation state.By the result of Fig. 4 (a) record as can be known, in flank, shrinkage factor average out to 1.5%, in base part, shrinkage factor average out to 0.77%, the bigger difference of existence between the shrinkage factor that confirms flank and the shrinkage factor of base part.Can infer that from this result the thickness of flank is thicker to be the bad reason of distortion.
The change 1 of condition of molding
Owing to the thickness of inferring flank becomes reason, to have produced distortion bad, therefore, change to following shape.
The thickness that changes to 2mmt, substrate except the thickness with rib changes to the 4mmt, by the method same with above-mentioned synthetic resin, obtains shrinkage factor and distributes.The gained shrinkage factor distributes and is shown in Fig. 4 (b).In addition, will (b) that be illustrated in Fig. 5 of actual deformation state be shown.By the result of Fig. 4 (b) record as can be known, the shrinkage factor of average out to 0.48% in flank, in base part, shrinkage factor average out to 1.03%, the bigger difference of existence between the shrinkage factor that confirms flank and the shrinkage factor of base part.Can infer that from this result the thickness of base part is thicker to be the bad reason of distortion.
The change 2 of condition of molding
Because supposition base part thickness can produce distortion when thicker bad, thereby change to following shape.The thickness that changes to 2mmt, substrate except the thickness with rib changes to the continually varying thickness, by the method same with above-mentioned synthetic resin, obtains shrinkage factor and distributes.Change being meant continuously, be changed to 6mmt (being 2mmt during Y=0) along Y direction thickness from 2mmt.The gained shrinkage factor distributes and is shown in Fig. 4 (c).In addition, will (c) that be illustrated in Fig. 5 of actual deformation state be shown.From the result of Fig. 4 (c) record as can be known, at thickness is base part about 2mmt, shrinkage factor average out to 0.52%, at thickness is base part about 6mmt, shrinkage factor average out to 1.32% confirms between the shrinkage factor of the heavy section of the shrinkage factor of the thinner wall section of base part and base part and has bigger difference.Can infer that from this result the continuous variation of base part heavy wall is the bad reason of distortion.
The change 3 of condition of molding
Judge that according to above result the thickness that the thickness of rib is changed to 2mmt, substrate changes to 2mmt.The making of synthetic resin reaches thereafter, and operation all distributes with the above-mentioned shrinkage factor of obtaining equally.The gained shrinkage factor distributes and is shown in Fig. 4 (d).In addition, will (d) that be illustrated in Fig. 5 of actual deformation state be shown.From the result of Fig. 4 (d) record as can be known, at flank, shrinkage factor average out to 0.62%, in base part, shrinkage factor average out to 0.56%, confirming between the shrinkage factor of the shrinkage factor of flank and base part does not almost have difference.Shown in Fig. 5 (d), synthetic resin is not distortion almost.
Claims (4)
1. definite method of being out of shape poor prognostic cause, this method possesses:
The operation of the distribution of shrinkage factor is derived in distribution according to the displacement on the synthetic resin surface after taking out from mould; With,
According to the distribution of described shrinkage factor, big zone around the shrinkage ratio is defined as the operation that generation can become the zone of the contraction of being out of shape poor prognostic cause.
2. definite method of distortion poor prognostic cause according to claim 1, wherein, the zone that described shrinkage factor is big is the zone of shrinkage factor maximum.
3. one kind is out of shape bad inhibition method, and it is the bad bad inhibition method of distortion of distortion of the synthetic resin after inhibition is taken out from mould, and this method possesses:
The operation of the distribution of the shrinkage factor on the synthetic resin surface after derivation is taken out from mould; With,
According to the distribution of described shrinkage factor, big zone around the shrinkage ratio is defined as the operation that generation can become the zone of the contraction of being out of shape poor prognostic cause; With,
The operation of the condition of molding of the shrinkage factor in the zone that the described shrinkage factor of decision inhibition is big.
4. the bad inhibition method of distortion according to claim 3, wherein, the zone that described shrinkage factor is big is the zone of shrinkage factor maximum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010117273A JP5525912B2 (en) | 2010-05-21 | 2010-05-21 | Method for identifying deformation cause part of resin molded product and method for suppressing deformation defect |
| JP2010-117273 | 2010-05-21 |
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| CN102248648A true CN102248648A (en) | 2011-11-23 |
| CN102248648B CN102248648B (en) | 2015-04-22 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148232A (en) * | 2000-11-14 | 2002-05-22 | Kanto Auto Works Ltd | Analytical method for thermal deformation of injection- molded article |
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| JP4281091B2 (en) * | 2005-09-06 | 2009-06-17 | 関東自動車工業株式会社 | Deformation analysis method for resin molded parts |
| JP4781068B2 (en) * | 2005-09-27 | 2011-09-28 | 株式会社ブリヂストン | Inspection method of resin sheet and evaluation method of resin sheet for solar cell encapsulant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148232A (en) * | 2000-11-14 | 2002-05-22 | Kanto Auto Works Ltd | Analytical method for thermal deformation of injection- molded article |
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| JP2011242369A (en) | 2011-12-01 |
| CN102248648B (en) | 2015-04-22 |
| JP5525912B2 (en) | 2014-06-18 |
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