CN102248648B - 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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- CN102248648B CN102248648B CN201110129646.6A CN201110129646A CN102248648B CN 102248648 B CN102248648 B CN 102248648B CN 201110129646 A CN201110129646 A CN 201110129646A CN 102248648 B CN102248648 B CN 102248648B
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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 a kind of method that synthetic resin produces the region of contraction on the surface of determining, this contraction can become takes out the bad reason of the distortion that occurs after resin forming product from mould; With the bad suppressing method of distortion for suppressing the distortion of the synthetic resin after taking out from mould bad.
Background technology
Synthetic resin does not have the cheap and feature of lightweight of the such burn into of metal, timber owing to having, and therefore, is used to various field.In addition, in order to save earth resource by recirculation, the major part of synthetic resin is formed by thermoplastic resin.Further, due to the various forming methods such as compression forming, transfer molding, injection moulding, extrusion molding, blow molding can be used, and the progress of forming machine and mould structure, thus make the synthetic resin of complicated shape also can be easily shaping.
Particularly by the manufacture of injection molding synthetic resin have productivity ratio good, can easily be shaped to the advantages such as the product of complicated shape, therefore, carry out to the scope of the broadness of sundry goods product from industrial products.
Just very high from the temperature of the synthetic resin of die for injection molding taking-up.Synthetic resin is cooled after taking-up, but due to from this condition of high temperature to the variations in temperature of low-temperature condition, synthetic resin deforms.The distortion of this synthetic resin is not that products formed entirety is as one man out of shape.Therefore, the problems such as buckling deformation (following, to be sometimes referred to as the problem that distortion is bad) can be produced in synthetic resin.
Bad and be molded with resin the deformation analysis of product in order to reduce this distortion.Specifically, according to the characteristic (physical property) etc. of the resin material of condition of molding, forming machine, use, analysis software is utilized to carry out analyzing (patent document 1) by the design shape model of resin forming component.
prior art document
patent document
Patent document 1: Japanese Unexamined Patent Publication 2007-71674 publication
Summary of the invention
the problem that invention will solve
Even if carry out the existing deformation analysis as recorded in patent document 1, the position that can become the bad reason of distortion also cannot be determined, the very time-consuming and time when determining the condition of molding be applicable to.
The present invention completes to solve the problem, its object is to, the method easily determining to produce the region of contraction on the surface at synthetic resin is provided, this contraction can become takes out the bad reason of the distortion after synthetic resin from mould, and provide and decide suitable condition of molding according to the Shrinkage behavior in determined region, thus the method suppressing distortion bad.
for the scheme of dealing with problems
The present inventor etc. conduct in-depth research repeatedly in order to overcome the above problems.It found that, as 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 from the synthetic resin surface after mould taking-up; With, according to the distribution of above-mentioned shrinkage factor, region large around shrinkage ratio is defined as the method that generation can become the operation in the region of the contraction of distortion poor prognostic cause, then solves the problems referred to above, thus complete the present invention.More particularly, the invention provides following technical scheme.
(1) be out of shape a defining method for poor prognostic cause, the method possesses: the operation deriving the distribution of shrinkage factor according to the distribution of the displacement from the synthetic resin surface after mould taking-up; With, according to the distribution of described shrinkage factor, region large around shrinkage ratio is defined as the operation that generation can become the region of the contraction of distortion poor prognostic cause.
(2) defining method of the distortion poor prognostic cause Gen Ju (1), wherein, the region that aforementioned shrinkage factor is large is the maximum region of shrinkage factor.
(3) the bad suppressing method of a kind of distortion, it is the bad suppressing method of distortion suppressing the distortion of the synthetic resin after taking out from mould bad, and the method possesses: the operation deriving the distribution of the shrinkage factor on the synthetic resin surface after taking out from mould; With, according to the distribution of aforementioned shrinkage factor, region large around shrinkage ratio is defined as the operation that generation can become the region of the contraction of distortion poor prognostic cause; With, determine the operation of the condition of molding of the shrinkage factor in the region that the described shrinkage factor of suppression is large.
(4) the bad suppressing method of the distortion Gen Ju (3), wherein, the region that aforementioned shrinkage factor is large is the maximum region of shrinkage factor.
invention effect
According to the present invention, easily can determine the region producing contraction at synthetic resin on the surface, described contraction can become takes out the bad reason of the distortion that occurs after synthetic resin from mould.Owing to easily determining that generation can become the position of the contraction of the bad reason of distortion like this, such condition of molding that the amount of contraction that thus suppression can become the region of the bad reason of distortion changes also can easily determine, can easily suppress distortion bad thus.
Accompanying drawing explanation
(a) of Fig. 1 is for illustrating the figure of the flaky resin products formed with irregular spot pattern; B () is for illustrating that the surface segmentation of the synthetic resin by having irregular spot pattern is the figure of the state in multiple region; C () is for illustrating the figure of the enlarged drawing of the part in the multiple regions shown in (b).
(a) of Fig. 2 is for illustrating the figure of the mode being measured the distortion of synthetic resin by filming apparatus; B () is for illustrating the figure of the synthetic resin after distortion; C () is for illustrating the figure of the enlarged drawing of the synthetic resin before distortion; D () is for illustrating the figure of the enlarged drawing of the synthetic resin after distortion.
Fig. 3 is the figure that the synthetic resin used in embodiment 1 is shown.
Fig. 4 is the figure of the shrinkage factor distribution results of the synthetic resin that embodiment 1 is shown.
Fig. 5 is the figure of the deformation state of the synthetic resin that embodiment 1 is shown.
description of reference numerals
1,2: synthetic resin
11: spot pattern
12: region
3: filming apparatus
Detailed description of the invention
Below, embodiments of the present invention are described in detail, but the present invention is by any restriction of following embodiment, can in the scope of the object of the invention in addition suitably change implement.In addition, there is repetition part for explanation, sometimes suitably eliminate explanation, but not the purport of invention is limited.
the defining method of distortion poor prognostic cause
The defining method of distortion poor prognostic cause of the present invention possesses: the operation (following, to be sometimes referred to as " the first operation ") deriving the distribution of shrinkage factor according to the distribution of the displacement from the synthetic resin surface after mould taking-up; With, according to the distribution of aforementioned shrinkage factor, region large around shrinkage ratio is defined as the operation (following, to be sometimes referred to as " the second operation ") that generation can become the region of 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 multiple region, measures the operation of shrinkage factor distribution according to the displacement in each region after mould taking-up synthetic resin.
The resin material shaping for synthetic resin is not particularly limited, existing known resin material can be used.In addition, the resin compound that various kinds of resin material mixes also is belonged to above-mentioned resin material.And then, also comprise and add the additives such as pigment, antioxidant, stabilizing agent, plasticizer, lubricant, releasing agent and fire retardant such as nucleator, carbon black, inorganic sintered pigment to give the resin material of desired characteristic to resin.
The shape of synthetic resin is also not particularly limited, to all applicable the present invention of the synthetic resin of any shape.Easily problem is become when products formed uneven thickness in the present invention as the distortion such as buckling deformation improving target is bad.This is because in same products formed, the products formed of uneven thickness has heavy section and thinner wall section, in heavy section with thinner wall section, easily there is different deformational behaviors.The present invention is best suited for the distortion of products formed that improves this wall unevenness is bad.
Below, an example of the derivation of shrinkage factor distribution is described.Such as, the mensuration of shrinkage factor distribution is undertaken by following method.
The surface of the synthetic resin possessing irregular pattern can be divided into multiple region, and measure each interregional displacement as a style by the distortion of the style in each region using a region, and derive shrinkage factor distribution according to this displacement.
As " irregular pattern ", irregular spot pattern, striated pattern, marble pattern, hide-like pattern etc. can be listed.In addition, pattern can be any one of plane pattern, 3 D pattern.In addition, the method for mark pattern is not particularly limited, the method etc. by sprayer mark pattern can be enumerated.
By scheming to be described " being divided into multiple region ".(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 the mode in multiple region 12.
" one, a region style " refers to: as shown in (c) of Fig. 1, when the spot pattern 11 in each region 12 is considered as a style as entirety, divided each region 12 is all recognized as different styles substantially.That is, as shown in (c) of Fig. 1, refer to that the style of region A is all different from the style of region B, C, D.
Then, the mensuration of displacement is described.As described below, by obtaining displacement in multiple region to derive the distribution of displacement.Further, shrinkage factor can be derived by the distribution of derived displacement to distribute.The mensuration of displacement can by derivation such as the displacements of the displacement between the style of above-mentioned zone, style.The assay method of displacement is not particularly limited, preferably, synthetic resin is not measured contiguously with measuring instrument etc.This is because, when synthetic resin is contacted with measuring instrument, sometimes cannot Accurate Determining deflection because of the impact of the binding agent for contacting etc.
Be not particularly limited the method measuring displacement non-contiguously, (a), (b) of Fig. 2 shows an example of the method measuring displacement non-contiguously.
(a) display of Fig. 2 has the mode of the synthetic resin 2 of irregular spot pattern by filming apparatus 3 shooting.Synthetic resin 2 shown in (a) of Fig. 2 is the states of just almost not shrinking after mould taking-up.Filming apparatus 3 is the devices for measuring displacement, preferably, uses the filming apparatus such as CCD camera to measure the method for displacement like this.This is because, if use the method for the filming apparatus such as CCD camera, then easily measure displacement exactly, and then, large displacement can be easily measured by the shooting area expanding camera, in addition, by amplifying the coverage of camera with the multiplying power of regulation, also little displacement can easily be measured.That is, even if when displacement is little, also by bust shot scope, point measure displacement several times, thus easily and derive overall displacement distribution exactly.Its result, also easily and exactly can obtain shrinkage factor distribution.
(b) of Fig. 2 shows the synthetic resin 2 after shrinking due to cooling after mould taking-up.Shrink Δ X as a whole in X direction, shrink Δ Y along Y-direction.When the contraction of synthetic resin 2 entirety is basically identical, obtain the displacement compared with large regions like this, but in fact, in synthetic resin, displacement, deformation direction are situations miscellaneous is very many.
The figure that (c) of Fig. 2 is same with Fig. 1 (c), shows the enlarged drawing of the synthetic resin before distortion.That is, (c) of Fig. 2 illustrates the state of just almost not shrinking after mould taking-up.(d) of Fig. 2 illustrate from after shrinking because of cooling after mould takes out, with the enlarged drawing of the synthetic resin of (c) same position of Fig. 2.
As shown in (c) of Fig. 2, before shrinking, between adjacent area, the distance of (between region B and region C) is X
a.As shown in (d) of Fig. 2, the distance after shrinking between above-mentioned zone becomes X
a'.Now displacement is (X
a-X
a'), shrinkage factor is { (X
a-X
a')/X
a} × 100 (%).Also same mensuration is carried out to each interregional shrinkage factor, shrinkage factor distribution can be derived thus.
In addition, when deriving shrinkage factor distribution, the method for the interregional distance of above-mentioned this use is not limited to.In addition, being divided into above-mentioned this discreet region to be to measure displacement locally, as long as measure the method for the displacement on the synthetic resin surface of local, just can preferably adopting any method.
In addition, to the synthetic resin also applicable the present invention without pattern.When synthetic resin does not have pattern, need to mark pattern after shaping.Due to after taking out from mould immediately shrink, thus preferred in mould, mark pattern with shaping simultaneously method, take out from mould after immediately synthetic resin is carried out to the method for pattern mark.
In addition, can the pattern of identification pattern as long as region is set to, just can analyze.Therefore, even if spot is comparatively large, as long as correspondingly region is set comparatively large just no problem.Therefore, the size of optimal pattern changes according to the size in region.That is, setting regions is carried out according to the size of spot.In addition, by splitting the surface of synthetic resin and being divided into multiple region to shorten interregional distance, thus can more precisely measure.When filming apparatus such as using CCD camera measures, carried out the camera etc. taking, change to high pixel by bust shot region, interregional distance can be shortened, thus can high-precision mensuration be carried out.
The mensuration that marked the deflection of spot pattern that above-mentioned this use CCD camera is carried out, such as, can use Digital 3D-Correlation System VIC-3D (manufacture of Correlated Solutions company) to carry out.
second operation
In second operation, according to the shrinkage factor distribution of deriving in above-mentioned first operation, region large around shrinkage ratio is defined as the region that generation can become the contraction of distortion poor prognostic cause.When having larger position, shrinkage factor local, this place becomes the bad reason of distortion.Its distortion of position that shrinkage factor is large may not be large, but according to the first operation of the present invention, easily can determine to become the position that the shrinkage factor local of distortion poor prognostic cause is larger.
In addition, shrinkage factor becomes maximum region and easily becomes the bad larger reason of distortion, and according to the present invention, also easily can determine the position that shrinkage factor is maximum.
< is out of shape bad suppressing method >
In the bad suppressing method of distortion of the present invention, derivation can suppress the shrinkage factor local confirmed by above-mentioned shrinkage factor distribution to become the molding condition shunk large position.Become the position of large part according to shrinkage factor local, displacement decides condition of molding.Here, condition of molding, except the general condition of molding such as to impose a condition of shaped device, also comprises the condition of the shape of synthetic resin.
Such as, when by synthetic resin without potting resin forming materials, the shape (position of heavy section, thinner wall section, the ratio of thinner wall section) of synthetic resin, the Temperature Distribution in mould, pressure distribution have considerable influence to distortion such as the warpages of synthetic resin.Therefore, particularly when without potting resin material, by studying the shape of synthetic resin, the distortion of synthetic resin can be suppressed.In addition, refer to without potting resin material: not containing the resin material of the strengthening inorganic fillers such as glass fibre.
When the shape of synthetic resin is studied in the distortion such as the warpage occurred in the above-mentioned synthetic resin without potting resin forming materials in order to eliminate, as long as the change of the molding conditions such as the change carry out position large for shrinkage factor to become more thin-walled, the surrounding of position that shrinkage factor is large becomes more heavy wall, only strengthened in the cooling of position to mould that shrinkage factor is large, then have and eliminate the bad tendency of distortion.
In addition, distortion can not sometimes be eliminated by condition of molding change once bad.This is because, eliminate a bad reason of distortion in a lot of situation and can not be reacted to entirety.Therefore, by carrying out the change of for several times condition of molding, from each products formed, shrinkage factor local becomes large position, displacement to investigate suitable condition of molding, thus can easily determine not produce the bad condition of molding of distortion.
embodiment
Below, enumerate embodiment and further describe the present invention, the present invention is not limited to these embodiment.
resin material
Without filling polyacetal resin: Duracon M90-44 (Polyplastics Co., Ltd.'s manufacture)
embodiment 1
By the synthetic resin of shape such shown in injection moulding construction drawing 3, size.After taking out above-mentioned synthetic resin from mould within 5 seconds, to synthetic resin spraying pigment inks, and to the irregular spot pattern of the surface markers of synthetic resin.
Use Digital 3D-Correlation System VIC-3D (manufacture of CorrelatedSolutions company), synthetic resin surface is divided into multiple region, and use displacement, the distribution of derivation shrinkage factor of the plurality of area test local.Minute is to take out after synthetic resin 5 minutes from mould.In addition, owing to the surface of synthetic resin can being divided into multiple region instantaneously and the mensuration of deflection can be started while being divided into multiple region, therefore, substantial minute is after mark pattern 5 minutes.
The shrinkage factor obtained as mentioned above distribution is shown in (a) of Fig. 4.And then by (a) that be illustrated in Fig. 5 of deformation state actual for display.The result recorded from (a) of Fig. 4, in flank, shrinkage factor average out to 1.5%, in base part, shrinkage factor average out to 0.77%, confirms between the shrinkage factor of flank and the shrinkage factor of base part and there is larger difference.Can infer from this result, the thickness of flank is thicker is be out of shape bad reason.
the change 1 of condition of molding
Owing to inferring that the thickness of flank becomes reason, to create distortion bad, therefore, change to following shape.
Except the thickness of rib is changed to 2mmt, the thickness of substrate changes to except 4mmt, by the method same with above-mentioned synthetic resin, obtains shrinkage factor distribution.The distribution of gained shrinkage factor is shown in (b) of Fig. 4.In addition, will illustrate (b) that be illustrated in Fig. 5 of actual deformation state.The result recorded from (b) of Fig. 4, the shrinkage factor of average out to 0.48% in flank, in base part, shrinkage factor average out to 1.03%, confirms between the shrinkage factor of flank and the shrinkage factor of base part and there is larger difference.Can infer from this result, the thickness of base part is thicker is be out of shape bad reason.
the change 2 of condition of molding
Bad owing to inferring that base part thickness can produce distortion time thicker, thus change to following shape.Except the thickness of rib is changed to 2mmt, the thickness of substrate changes to except continually varying thickness, by the method same with above-mentioned synthetic resin, obtains shrinkage factor distribution.Consecutive variations refers to, is changed to 6mmt (being 2mmt during Y=0) along Y-direction thickness from 2mmt.The distribution of gained shrinkage factor is shown in (c) of Fig. 4.In addition, will illustrate (c) that be illustrated in Fig. 5 of actual deformation state.From the result that (c) of Fig. 4 records, be the base part of about 2mmt at thickness, shrinkage factor average out to 0.52%, be the base part of about 6mmt at thickness, shrinkage factor average out to 1.32%, confirms and there is larger difference between the shrinkage factor of the thinner wall section of base part and the shrinkage factor of the heavy section of base part.Can infer from this result, the consecutive variations of base part heavy wall is out of shape bad reason.
the change 3 of condition of molding
Judge according to above result, the thickness of rib is changed to 2mmt, the thickness of substrate changes to 2mmt.The making of synthetic resin and thereafter operation obtain shrinkage factor distribution all as described above.The distribution of gained shrinkage factor is shown in (d) of Fig. 4.In addition, will illustrate (d) that be illustrated in Fig. 5 of actual deformation state.From the result that (d) of Fig. 4 records, at flank, shrinkage factor average out to 0.62%, in base part, shrinkage factor average out to 0.56%, confirms between the shrinkage factor of flank and the shrinkage factor of base part and does not almost have difference.As shown in (d) of Fig. 5, synthetic resin is not almost out of shape.
Claims (4)
1. be out of shape a defining method for poor prognostic cause, the method possesses:
Irregular pattern is given to the synthetic resin surface after taking out from mould, the surface of the synthetic resin possessing described irregular pattern is divided into multiple region, and measure each interregional displacement as a style by the distortion of the style in each region using a region, the operation of the distribution of shrinkage factor is derived according to the distribution of described displacement; With,
According to the distribution of described shrinkage factor, be defined as region large around shrinkage ratio to produce the operation causing the region being out of shape bad contraction.
2. the defining method of distortion poor prognostic cause according to claim 1, wherein, the region that described shrinkage factor is large is the maximum region of shrinkage factor.
3. be out of shape a bad suppressing method, it is the bad suppressing method of distortion suppressing the distortion of the synthetic resin after taking out from mould bad, and the method possesses:
Irregular pattern is given to the synthetic resin surface after taking out from mould, the surface of the synthetic resin possessing described irregular pattern is divided into multiple region, and measure each interregional displacement as a style by the distortion of the style in each region using a region, the operation of the distribution of shrinkage factor is derived according to the distribution of described displacement; With,
According to the distribution of described shrinkage factor, be defined as region large around shrinkage ratio to produce the operation causing the region being out of shape bad contraction; With,
Determine the operation of the condition of molding of the shrinkage factor in the region that the described shrinkage factor of suppression is large.
4. the bad suppressing method of distortion according to claim 3, wherein, the region that described shrinkage factor is large is the maximum region of shrinkage factor.
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 CN102248648A (en) | 2011-11-23 |
| CN102248648B true CN102248648B (en) | 2015-04-22 |
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| JP (1) | JP5525912B2 (en) |
| CN (1) | CN102248648B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4144685B2 (en) * | 2000-11-14 | 2008-09-03 | 関東自動車工業株式会社 | Thermal deformation analysis method for injection molded products |
| 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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| CN102248648A (en) | 2011-11-23 |
| JP2011242369A (en) | 2011-12-01 |
| JP5525912B2 (en) | 2014-06-18 |
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