JP5349859B2 - Molded product shape prediction method, molded product manufacturing method, molded product shape prediction program and storage medium thereof - Google Patents

Molded product shape prediction method, molded product manufacturing method, molded product shape prediction program and storage medium thereof Download PDF

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JP5349859B2
JP5349859B2 JP2008197804A JP2008197804A JP5349859B2 JP 5349859 B2 JP5349859 B2 JP 5349859B2 JP 2008197804 A JP2008197804 A JP 2008197804A JP 2008197804 A JP2008197804 A JP 2008197804A JP 5349859 B2 JP5349859 B2 JP 5349859B2
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弘明 山縣
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Canon Inc
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本発明は、成形品形状の予測方法、成形品の製造方法、成形品形状の予測プログラムとその記憶媒体に関するものである。 The present invention, the prediction method of a molded article shape, the method of manufacturing a molded article, it relates to a molded article shape prediction program and its storage medium.

射出成形品の変形形状を予測するソフトウエアとして、Ｍｏｌｄｆｌｏｗ Ｐｌａｓｔｉｃｓ Ｉｎｓｉｇｈｔ（登録商標）、３ＤＴＩＭＯＮ（登録商標）、Ｍｏｌｄｅｘ３Ｄ（登録商標）、等の樹脂流動解析ソフトウエアが市販されている。
これらのソフトウエアでは、樹脂物性を表すために近似モデルを用い、更に成形プロセスをシミュレートするため収縮挙動をモデル化して表現している。
そのため実際の現象とこれらのソフトウエアでモデル化された収縮挙動には差異がある。したがって、これらのソフトウエアを用いた場合、計算時間は短いものの実際のそり量、収縮量の予測値と実測値には差異が発生し、高精度な変形形状の予測には限界がある。 Resin flow analysis software such as Moldflow Plastics Insight (registered trademark), 3DTIMON (registered trademark), Moldex3D (registered trademark), and the like are commercially available as software for predicting the deformation shape of an injection molded product.
In these software, an approximate model is used to express the physical properties of the resin, and the shrinkage behavior is modeled and expressed to simulate the molding process.
Therefore, there is a difference between the actual phenomenon and the shrinkage behavior modeled by these software. Therefore, when these softwares are used, although the calculation time is short, there is a difference between the predicted value of the actual warpage amount and the contraction amount and the actual measurement value, and there is a limit to the prediction of the deformed shape with high accuracy.

このようなことから、従来において、樹脂の収縮挙動のモデル化精度を向上するため、樹脂の粘弾性特性を考慮した数値解析を用い成形品の形状を予測する方法が提案されている（特許文献１、特許文献２参照）。
また、特許文献３では、基本形状において得られた収縮データに基づいて変形解析を行うことによって、樹脂物性の近似誤差や収縮挙動をモデル化することで発生する収縮率の推定誤差、等の影響を抑制して変形形状を予測する物品の変形解析方法が提案されている。ここでは、収縮率データが、肉厚やゲートからの流動長、あるいは射出温度、金型温度、保圧、等による成形条件との関係において表わされるものとして扱われ、このような成形条件による収縮率データに基づいて、変形形状の予測をする方法が開示されている。
特開平１１−１３８６１０号公報 特開２００５−２８９７５７号公報 特開２００２−０４９６５０号公報 For this reason, conventionally, in order to improve the modeling accuracy of the shrinkage behavior of a resin, a method for predicting the shape of a molded product using numerical analysis in consideration of the viscoelastic characteristics of the resin has been proposed (Patent Literature). 1, see Patent Document 2).
Further, in Patent Document 3, by performing deformation analysis based on the shrinkage data obtained in the basic shape, the influence of the approximation error of the resin physical property, the estimation error of the shrinkage rate generated by modeling the shrinkage behavior, etc. There has been proposed a deformation analysis method for an article that predicts a deformed shape while suppressing the deformation. Here, shrinkage rate data is treated as being expressed in relation to molding conditions such as wall thickness, flow length from the gate, or injection temperature, mold temperature, holding pressure, etc., and shrinkage due to such molding conditions A method for predicting a deformed shape based on rate data is disclosed.
JP 11-138610 A JP 2005-289757 A JP 2002-049650 A

上記従来例における特許文献１、特許文献２においては、粘弾性特性を考慮した数値解析を行うと、成形プロセス中の刻々の温度、応力の状態を数値計算によって計算する必要があるため、計算量が多くなり計算時間が長くなるという問題がある。
これに対し、上記した特許文献３では、成形プロセス中の刻々の温度、応力を計算せず一回の計算で形状を予測できるため短時間で計算が可能となる。
しかし、特許文献３においては、実際には基本形状と成形条件だけでは表すことの出来ない成形品形状への影響等について考慮されていない。
例えば、樹脂圧により金型が変形することでキャビティ形状が変わることに起因する成形品形状への影響、成形時の温調により金型内に温度差が発生し金型が変形することに起因する成形品形状への影響、等について考慮されていない。
高精度な成形品形状の予測を行うにはこれらの影響を無視することはできないものである。 In Patent Document 1 and Patent Document 2 in the above-described conventional example, if numerical analysis is performed in consideration of viscoelastic characteristics, it is necessary to calculate the state of temperature and stress every moment during the molding process by numerical calculation. There is a problem that the calculation time becomes longer due to the increase of.
On the other hand, in Patent Document 3 described above, since the shape can be predicted by a single calculation without calculating the temperature and stress every moment during the molding process, the calculation can be performed in a short time.
However, in Patent Document 3, no consideration is given to the influence on the shape of a molded product that cannot be represented by only the basic shape and molding conditions.
For example, the effect on the shape of the molded product due to the change in the cavity shape due to the deformation of the mold due to the resin pressure, the temperature difference during molding causes a temperature difference in the mold and the deformation of the mold The influence on the shape of the molded product is not considered.
These effects cannot be ignored to predict the shape of a molded product with high accuracy.

本発明は、上記課題に鑑み、短時間で精度の高い形状の予測が可能となる成形品形状の予測方法、成形品の製造方法、成形品形状の予測プログラムとその記憶媒体を提供することを目的とするものである。 In view of the above problems, the prediction method of a molded article shape becomes possible short time with high accuracy shape prediction method of manufacturing a molded article, the molded article shape prediction programs and to provide the storage medium It is intended.

本発明は、つぎのように構成した成形品形状の予測方法、成形品の製造方法、成形品形状の予測プログラムとその記憶媒体を提供するものである。
本発明の成形品形状の予測方法は、
成形品形状データ、金型形状データ、成形条件データ、収縮率データを予め求めておく工程と、
前記成形品形状データ及び収縮率データから、予測の対象とされる成形品の収縮量を算出する工程と、
前記金型形状データ及び前記成形条件データから、室温と温調状態での金型の温度の差を前記金型各部の熱荷重として前記金型の弾性解析を行なうことで前記金型の熱変形量を算出する工程と、
前記金型形状データ及び前記成形条件データから、前記金型キャビティ表面にゲートシール時の内圧を荷重として与え、弾性解析を行なうことで前記内圧による前記金型の変形量を算出する工程と、
前記成形品の収縮量と前記金型の熱変形量と前記内圧による金型の変形量とを用いて、前記成形品の形状を予測する工程と、
を有することを特徴とする。
また、本発明の成形品形状又はキャビティ形状の予測プログラムは、上記した成形品形状の予測方法を、コンピュータに実行させることを特徴とする。
また、本発明のコンピュータが読み取り可能の記憶媒体は、上記した成形品形状の予測プログラムを記憶したことを特徴とする。
また、本発明の成形品の製造方法は、
成形品形状データ、金型形状データ、成形条件データ、収縮率データを予め求めておく工程と、
前記成形品形状データ及び収縮率データから、予測の対象とされる成形品の収縮量を算出する工程と、
前記金型形状データ及び前記成形条件データから、室温と温調状態での金型の温度の差を前記金型各部の熱荷重として前記金型の弾性解析を行なうことで前記金型の熱変形量を算出する工程と、
前記金型形状データ及び前記成形条件データから、前記金型キャビティ表面にゲートシール時の内圧を荷重として与え、弾性解析を行なうことで内圧による前記金型の変形量を算出する工程と、
前記成形品の収縮量と前記金型の熱変形量と前記内圧による金型の変形量とを用いて、前記金型の補正形状を得る工程と、
前記得られた金型の補正形状によって金型を作成する工程と、
前記作成した金型によって成形品を製造する工程と、
を有することを特徴とする。 The present invention provides method for predicting structure molded article shape as follows, the method of manufacturing a molded article, the molded article shape prediction program and its storage medium.
The method for predicting the shape of a molded article of the present invention is as follows.
A step of obtaining molded product shape data, mold shape data, molding condition data, shrinkage rate data in advance;
From the molded article shape data and the shrinkage ratio data, a step of calculating the amount of shrinkage of the molded article which is predicted for the subject,
From the mold shape data and the molding condition data, thermal deformation of the mold is performed by performing an elastic analysis of the mold using a difference in temperature of the mold between room temperature and a temperature-controlled state as a thermal load of each part of the mold. Calculating the amount;
From the mold shape data and the molding condition data, applying an internal pressure at the time of gate sealing to the mold cavity surface as a load, and calculating an amount of deformation of the mold due to the internal pressure by performing an elastic analysis;
Predicting the shape of the molded article using the amount of shrinkage of the molded article, the amount of thermal deformation of the mold and the amount of deformation of the mold due to the internal pressure ;
It is characterized by having .
Also, prediction program of the molded article shape or cavity shape of the present invention, a prediction how the molded article shape described above, is characterized by causing a computer to execute.
The computer readable storage medium of the present invention is characterized by storing a molded article shape prediction programs described above.
In addition, the method for producing a molded product of the present invention includes:
A step of obtaining molded product shape data, mold shape data, molding condition data, shrinkage rate data in advance;
A step of calculating a shrinkage amount of a molded product to be predicted from the molded product shape data and shrinkage rate data;
From the mold shape data and the molding condition data, thermal deformation of the mold is performed by performing an elastic analysis of the mold using a difference in temperature of the mold between room temperature and a temperature-controlled state as a thermal load of each part of the mold. Calculating the amount;
From the mold shape data and the molding condition data, applying an internal pressure at the time of gate sealing to the mold cavity surface as a load, and calculating an amount of deformation of the mold due to the internal pressure by performing an elastic analysis ;
Using the amount of shrinkage of the molded product, the amount of thermal deformation of the mold and the amount of deformation of the mold due to the internal pressure, to obtain a corrected shape of the mold;
Creating a mold with the corrected shape of the obtained mold;
A step of producing a molded article by the created mold,
It is characterized by having.

本発明によれば、短時間で精度の高い形状の予測が可能となる成形品形状の予測方法、成形品の製造方法、成形品形状の予測プログラムとその記憶媒体を実現することができる。 According to the present invention can be implemented prediction method of a molded article shape becomes possible short time with high accuracy shape prediction method of manufacturing a molded article, the molded article shape prediction program and its storage medium.

つぎに、本発明の実施の形態について説明する。
本実施形態における成形品形状の予測方法は、予測の対象とされる成形品に対して、つぎのような工程により実施される。
まず、成形品形状データ、金型形状データ、成形条件データ、収縮率データを予め求めておく。
次に、成形品の収縮量を算出する工程において、前記成形品形状データ及び収縮率データから、前記予測の対象とされる成形品の収縮量を算出する。
一方、金型の熱変形量を算出する工程において、前記金型形状データ及び前記成形条件データから、室温と温調状態での金型の温度の差を前記金型各部の熱荷重として前記金型の弾性解析を行なうことで前記金型の熱変形量を算出する。
また、内圧による金型の変形量を算出する工程において、前記金型形状データ及び前記成形条件データから、前記金型キャビティ表面にゲートシール時の内圧を荷重として与え、弾性解析を行なうことで前記内圧による前記金型の変形量を算出する。
そして、成形品の形状を予測する工程において、前記成形品の収縮量と前記金型の熱変形量と前記内圧による金型の変形量とを用いて、前記成形品の形状を予測する。
このような成形品形状の予測方法によれば、成形品設計形状をもとに成形後の仕上がりの成形品形状を予測することが可能となる。
したがって、成形品設計形状と仕上がりの成形品形状の差がわかるので、その差を無くすように成形品設計形状を修正することで、設計値通りの成形品形状になるような金型形状を得ることができる。
また、金型のキャビティ形状の予測方法を実施するに際しては、上記した成形品の形状の予測方法で算出された前記成形品の収縮量とキャビティの変形量を用いることで、金型のキャビティ形状を予測することができる。
このような成形品形状のキャビティ形状の予測方法によれば、仕上がりの成形品形状が成形品設計形状になるような金型形状を直接に得ることが可能となる。
したがって、得られた金型形状にて金型を作成することで設計値通りの成形品形状を仕上げることができ、金型を補正する必要を無くすことができる。 Next, an embodiment of the present invention will be described.
The method for predicting the shape of a molded product in the present embodiment is performed on the molded product to be predicted by the following steps.
First, molded product shape data, mold shape data, molding condition data, and shrinkage rate data are obtained in advance.
Next, in the step of calculating the shrinkage amount of the molded product, the shrinkage amount of the molded product to be predicted is calculated from the molded product shape data and the shrinkage rate data.
On the other hand, in the step of calculating the amount of thermal deformation of the mold , from the mold shape data and the molding condition data, the difference in the temperature of the mold between the room temperature and the temperature-controlled state is used as the thermal load of each part of the mold. The amount of thermal deformation of the mold is calculated by performing elastic analysis of the mold.
Further, in the step of calculating the deformation amount of the mold due to the internal pressure, from the mold shape data and the molding condition data, the internal pressure at the time of gate sealing is applied to the mold cavity surface as a load, and the elastic analysis is performed. The deformation amount of the mold due to the internal pressure is calculated.
Then, in the step of predicting the shape of the molded product, the shape of the molded product is predicted using the shrinkage amount of the molded product, the thermal deformation amount of the mold, and the deformation amount of the mold due to the internal pressure .
According to such a molded product shape prediction method, it is possible to predict the finished molded product shape after molding based on the molded product design shape.
Therefore, since the difference between the molded product design shape and the finished molded product shape can be known, by correcting the molded product design shape so as to eliminate the difference, a mold shape that achieves the molded product shape as designed is obtained. be able to.
Further, when performing the method for predicting the cavity shape of the mold, the cavity shape of the mold is obtained by using the shrinkage amount of the molded product and the deformation amount of the cavity calculated by the above-described prediction method of the shape of the molded product. Can be predicted.
According to such a method for predicting a cavity shape of a molded product shape, it is possible to directly obtain a mold shape such that the finished molded product shape becomes the molded product design shape.
Therefore, by creating a mold with the obtained mold shape, a molded product shape as designed can be finished, and the need for correcting the mold can be eliminated.

また、以上の予測方法は、これをコンピュータに実行させるようにした成形品形状又はキャビティ形状の予測プログラムを構成することができる。
また、このような予測プログラムを記憶するようにしたコンピュータが読み取り可能の記憶媒体を構成することができる。
また、つぎのような成形品形状及び金型のキャビティ形状の予測装置を構成することができる。
すなわち、予測の対象とされる成形品の形状データをもとにし、与えられた成形条件と該成形条件との関係において予め算出された収縮率に基づいて算出された収縮率データによって、前記予測の対象とされる成形品の収縮量を算出する成形品収縮量算出部と、
前記予測の対象とされる成形品に用いられる金型に対して与えられた金型の調温及び／又は金型の成形圧による成形条件によって変形する前記金型のキャビティの変形量を算出する金型変形量算出部と、
前記成形品収縮量算出部で算出された成形品の収縮量に基づいて、前記成形品の変形形状を算出する成形品変形形状算出部と、
前記金型変形量算出部で算出されたキャビティの変形量に基づいて、前記金型の補正形状を算出する金型補正形状算出部と、
を備えた、成形品形状と金型のキャビティ形状を予測することができる装置を構成することができる。
また、これらの予測方法及び装置は、特に、射出成形加工用金型の設計を行う際、キャビティ等の形状を決定するための設計支援に好適に適用することができる。 Further, the above prediction method can constitute a prediction program for a molded product shape or a cavity shape, which is executed by a computer.
Further, it is possible to configure a computer-readable storage medium that stores such a prediction program.
Moreover, the following prediction apparatus of the shape of a molded article and the cavity shape of a metal mold | die can be comprised.
That is, based on the shape data of the molded article to be predicted, the prediction is performed by the shrinkage rate data calculated based on the shrinkage rate calculated in advance in relation to the given molding conditions and the molding conditions. A molded product shrinkage amount calculation unit for calculating a shrinkage amount of a molded product to be subjected to,
The amount of deformation of the cavity of the mold that is deformed according to the mold temperature control and / or the molding conditions by the molding pressure of the mold is calculated for the mold used for the molded product to be predicted. A mold deformation amount calculation unit;
Based on the shrinkage amount of the molded product calculated by the molded product shrinkage amount calculation unit, a molded product deformation shape calculation unit that calculates a deformed shape of the molded product,
A mold correction shape calculation unit that calculates a correction shape of the mold based on the deformation amount of the cavity calculated by the mold deformation amount calculation unit;
The apparatus which can predict the shape of a molded article and the cavity shape of a metal mold | die provided with can be comprised.
In addition, these prediction methods and apparatuses can be suitably applied to design support for determining the shape of a cavity or the like, particularly when designing an injection mold.

以下に、本発明の実施例について説明する。
図１に、本実施例における成形品の形状予測装置及び形状予測方法について説明するためのブロック図を示す。
図１において、１はコンピュータ、２は補助記憶装置、３は出力装置、４は解析モデル、５は解析モデル読み込み部、６は演算部、７は出力部である。
１３は金型温調による金型変形量算出部（金型変形量予測部）、１４は成形圧による金型変形量算出部（内圧による金型変形量予測部）、１５は成形品収縮量算出部（成形品収縮
量予測部）である。
１６は成形品形状出力部（成形品変形形状算出部）、１７は金型補正形状出力部（金型補正形状算出部）である。 Examples of the present invention will be described below.
In FIG. 1, the block diagram for demonstrating the shape prediction apparatus and shape prediction method of the molded article in a present Example is shown.
In FIG. 1, 1 is a computer, 2 is an auxiliary storage device, 3 is an output device, 4 is an analysis model, 5 is an analysis model reading unit, 6 is a calculation unit, and 7 is an output unit.
13 is a mold deformation amount calculation unit (mold deformation amount prediction unit) based on mold temperature control, 14 is a mold deformation amount calculation unit based on molding pressure (mold deformation amount prediction unit based on internal pressure), and 15 is a contraction amount of the molded product. It is a calculation part (molded article shrinkage amount prediction part).
Reference numeral 16 denotes a molded product shape output unit (molded product deformed shape calculation unit), and 17 denotes a mold correction shape output unit (mold correction shape calculation unit).

本実施例の成形品の形状予測装置は、コンピュータ１と補助記憶装置２を備えている。本実施例において、コンピュータ１は、解析モデル読み込み部５、演算部６、出力部７を備え、成形品の形状予測方法に用いられるプログラムは、コンピュータ１に読み込まれ、演算部６で演算処理が行われれる。
なお、上記プログラムは補助記憶装置２に解析モデル４が予め作成されていることが前提とされる。
この解析モデル４は、成形品形状データ９、金型形状データ１０、成形条件データ１１、収縮率データ１２からなり、本実施例のプログラムの解析モデル読み込み部５によりコンピュータのメモリ上に読み込まれる。
演算部６は、金型温調による金型変形量算出部１３、成形圧による金型変形量算出部１４、成形品収縮量算出部１５からなり、読み込まれた解析モデル４を元に金型もしくは成形品の変形量を算出する。 The molded product shape prediction apparatus of the present embodiment includes a computer 1 and an auxiliary storage device 2. In this embodiment, the computer 1 includes an analysis model reading unit 5, a calculation unit 6, and an output unit 7, and a program used for the molded product shape prediction method is read into the computer 1, and calculation processing is performed by the calculation unit 6. Done.
The program is premised on the analysis model 4 being created in advance in the auxiliary storage device 2.
The analysis model 4 includes molded product shape data 9, mold shape data 10, molding condition data 11, and shrinkage rate data 12, and is read into the memory of the computer by the analysis model reading unit 5 of the program of this embodiment.
The calculation unit 6 includes a mold deformation amount calculation unit 13 based on mold temperature control, a mold deformation amount calculation unit 14 based on molding pressure, and a molded product shrinkage amount calculation unit 15, and the mold is based on the read analysis model 4. Alternatively, the deformation amount of the molded product is calculated.

また、出力部７は、成形品形状出力部１６および金型補正形状出力部１７からなり、補助記憶装置２に解析結果８を出力する。
解析結果８は、成形品変形形状データ１８および金型補正形状データ１９からなる。
出力装置３は、ディスプレや、出力用紙を出力する手段を含む装置からなり、出力部７の結果は出力装置３へも出力されるように構成される。
成形品形状出力部１６は、成形品形状に上記の金型変形量算出部１３、金型変形量算出部１４、成形品収縮量算出部１５において計算された金型もしくは成形品の変形量を加えて成形品形状を算出し、成形品変形形状データ１８を出力する。
また、金型補正形状出力部１７は、つぎのように金型補正形状データ１９を出力する。
成形品形状に上記の金型変形量算出部１３、金型変形量算出部１４、成形品収縮量算出部１５において計算された金型もしくは成形品の変形量における正の変位量を反転させた同量の負の変位量を加えて金型キャビティ形状を算出する。そして金型補正形状データ１９を出力する。 The output unit 7 includes a molded product shape output unit 16 and a mold correction shape output unit 17, and outputs an analysis result 8 to the auxiliary storage device 2.
The analysis result 8 includes a deformed product shape data 18 and mold correction shape data 19.
The output device 3 includes a device including a display and a means for outputting output paper, and the result of the output unit 7 is configured to be output to the output device 3 as well.
The molded product shape output unit 16 adds the deformation amount of the mold or the molded product calculated by the mold deformation amount calculation unit 13, the mold deformation amount calculation unit 14, and the molded product shrinkage amount calculation unit 15 to the molded product shape. In addition, the molded product shape is calculated, and the molded product deformed shape data 18 is output.
The mold correction shape output unit 17 outputs the mold correction shape data 19 as follows.
The positive displacement amount in the deformation amount of the mold or the molded product calculated in the mold deformation amount calculation unit 13, the mold deformation amount calculation unit 14, and the molded product shrinkage amount calculation unit 15 is inverted to the shape of the molded product. The mold cavity shape is calculated by adding the same amount of negative displacement. Then, mold correction shape data 19 is output.

つぎに、本実施例における上記した成形品の形状予測装置を用いて形状予測をする方法について説明する。
図２に、本実施例における成形品の形状予測方法を説明するためのフローチャートを示す。
本実施例においては、まず、前提条件として収縮率ＤＢ Ｓ４には板厚、成形条件と収縮率の関係がＤＢとして蓄えられており、成形品モデルＳ１、金型モデルＳ２、成形条件Ｓ３が定義されているものとする。
図３に成形品モデル、図４に金型モデル、図５に収縮率ＤＢに登録されている樹脂収縮率モデルの、それぞれの１例を示す。
なお、図５に示した収縮率モデルは、ｘ、ｙ、ｚ各方向の収縮率は最大板厚、偏肉比、型温、内圧の関数として表している。
収縮率モデルは必ずしも関数である必要はなく、最大板厚、偏肉比、型温、内圧をパラメータとしたテーブルデータでも良い。 Next, a method for predicting the shape using the above-described molded product shape prediction apparatus in the present embodiment will be described.
FIG. 2 shows a flowchart for explaining a method for predicting the shape of a molded product in this embodiment.
In the present embodiment, first, as a precondition, the shrinkage rate DB S4 stores the relation between the plate thickness, the molding condition and the shrinkage rate as DB, and the molded product model S1, the mold model S2, and the molding condition S3 are defined. It is assumed that
FIG. 3 shows an example of a molded product model, FIG. 4 shows a mold model, and FIG. 5 shows an example of a resin shrinkage rate model registered in the shrinkage rate DB.
In the shrinkage rate model shown in FIG. 5, the shrinkage rates in the x, y, and z directions are expressed as a function of the maximum plate thickness, thickness deviation ratio, mold temperature, and internal pressure.
The shrinkage rate model does not necessarily need to be a function, and may be table data using the maximum thickness, thickness deviation ratio, mold temperature, and internal pressure as parameters.

成形品の形状予測に際して、最初にＳ４の収縮率ＤＢ、Ｓ１の成形品モデル、Ｓ３の成形条件をもとに、収縮率算出部Ｐ１により成形品各部の収縮率データＭ１を計算する。
その際、Ｐ１の収縮率算出部はＳ１の成形品モデルの形状をもとに各部の板厚を算出し、与えられた成形条件である金型温度、成形圧力及びＳ４の収縮率ＤＢをもとに、成形品各部の収縮率データＭ１の算出を行なう。
図５に示した収縮率モデルの場合には、成形品の板厚、成形条件として型温、内圧がわかれば収縮率ＤＢに登録された係数を用い収縮率を算出することができる。
また、板厚は図３に示した成形品モデルから図６に示すように計算することができる。
次に、Ｐ２の成形品収縮量算出部１５において、Ｓ１の成形品モデルを解析対象とし、成形品各部に収縮率データＭ１を与えて成形品収縮量Ｍ２を計算する。
図７に成形品各部に収縮率データを与え、成形品形状を計算した例を示す。 In predicting the shape of the molded product, first, based on the shrinkage rate DB of S4, the molded product model of S1, and the molding conditions of S3, shrinkage rate data M1 of each part of the molded product is calculated by the shrinkage rate calculation unit P1.
At that time, the shrinkage rate calculation unit of P1 calculates the plate thickness of each part based on the shape of the molded product model of S1, and provides the mold temperature, the molding pressure, and the shrinkage rate DB of S4 which are given molding conditions. In addition, the shrinkage rate data M1 of each part of the molded product is calculated.
In the case of the shrinkage rate model shown in FIG. 5, the shrinkage rate can be calculated using the coefficient registered in the shrinkage rate DB if the thickness of the molded product and the mold temperature and the internal pressure are known as the molding conditions.
Further, the plate thickness can be calculated from the molded product model shown in FIG. 3 as shown in FIG.
Next, in the molded product shrinkage amount calculation unit 15 of P2, the molded product model of S1 is set as an analysis target, and shrinkage rate data M1 is given to each part of the molded product to calculate the molded product shrinkage amount M2.
FIG. 7 shows an example in which shrinkage ratio data is given to each part of the molded product and the shape of the molded product is calculated.

次に、Ｓ２の金型モデルを解析対象としてＳ３の成形条件を与え、Ｐ３の金型温調による金型変形量算出部１３において、金型のキャビティ変形量Ｍ３を算出する。
その際、金型モデルは冷却管を含んだモデルが用いられ、Ｓ３の成形条件として冷媒温度、冷媒流量を与え、温調状態での金型温度分布を算出する。
その後、室温と温調状態での金型温度の差を金型各部の熱荷重として金型の弾性解析を行うことで金型の熱変形量の予測を行なう。
図８に、金型モデルと温調状態の金型温度分布を予測するための各条件の例を示す。
また、図９に温調による金型の熱変形を予測するための条件の例を示す。 Next, the molding condition of S3 is given with the mold model of S2 as an analysis target, and the mold deformation amount calculation unit 13 by the mold temperature control of P3 calculates the mold cavity deformation amount M3.
At that time, a model including a cooling pipe is used as the mold model, and the coolant temperature and the coolant flow rate are given as the molding conditions in S3, and the mold temperature distribution in the temperature controlled state is calculated.
Thereafter, the amount of thermal deformation of the mold is predicted by performing an elastic analysis of the mold using the difference in mold temperature between the room temperature and the temperature controlled state as the thermal load of each part of the mold.
FIG. 8 shows an example of each condition for predicting the mold model and the mold temperature distribution in the temperature controlled state.
Moreover, the example of the conditions for estimating the thermal deformation of the metal mold | die by temperature control in FIG. 9 is shown.

次に、Ｓ２の金型モデルを解析対象としてＳ３の成形条件を与え、Ｐ４の内圧による金型変形量予測部１４において、成形中の金型キャビティ変形量Ｍ４を算出する。
その際、解析対象は金型で金型キャビティ表面に成形条件として指定されたゲートシール時の成形品内圧を荷重として与え、弾性解析を行うことで内圧による金型の変形量を予測する。
図１０に成形品内圧による金型変形の計算例を示す。 Next, the molding condition of S3 is given with the mold model of S2 as an analysis target, and the mold cavity deformation amount M4 during molding is calculated in the mold deformation amount prediction unit 14 by the internal pressure of P4.
At that time, the object of analysis is a mold, and the internal pressure of the molded product at the time of gate sealing specified as a molding condition is applied to the surface of the mold cavity as a load, and the deformation amount of the mold due to the internal pressure is predicted by performing an elastic analysis.
FIG. 10 shows a calculation example of mold deformation due to the internal pressure of the molded product.

次に、Ｐ５の成形品変形形状算出部１６において、成形品収縮量Ｍ２、金型キャビティ変形量Ｍ３、金型キャビティ変形量Ｍ４を、成形品形状に加えることで成形品変形形状Ｏ１を算出する。
図１１に成形品形状に成形品収縮量と金型キャビティ面の変形量を加え、成形品変形形状を算出した例を示す。
同時に、Ｐ６の金型補正形状算出部１７によって成形品収縮量Ｍ２、金型キャビティ変形量Ｍ３、金型キャビティ変形量Ｍ４における正の変位量を反転させた負の変位量を加えて金型キャビティ形状を算出し、金型補正形状データを出力する。 Next, in the molded product deformation shape calculation unit 16 of P5, the molded product deformation shape O1 is calculated by adding the molded product shrinkage amount M2, the mold cavity deformation amount M3, and the mold cavity deformation amount M4 to the molded product shape. .
FIG. 11 shows an example in which the molded product deformation shape is calculated by adding the molded product shrinkage and the mold cavity surface deformation to the molded product shape.
At the same time, the mold correction shape calculation unit 17 of P6 adds a negative displacement amount obtained by inverting the positive displacement amount in the molded product shrinkage amount M2, the mold cavity deformation amount M3, and the mold cavity deformation amount M4, thereby obtaining the mold cavity. The shape is calculated and the die correction shape data is output.

本発明の実施例における成形品の形状予測装置及び形状予測方法について説明するためのブロック図である。It is a block diagram for demonstrating the shape prediction apparatus and shape prediction method of the molded article in the Example of this invention. 本発明の実施例における成形品の形状予測方法を説明するためのフローチャートである。It is a flowchart for demonstrating the shape prediction method of the molded article in the Example of this invention. 本発明の実施例におけるメッシュ分割された成形品モデルの一例を示す図である。It is a figure which shows an example of the molded article model by which the mesh division | segmentation in the Example of this invention was carried out. 本発明の実施例における金型モデルの一例を示す図である。It is a figure which shows an example of the metal mold | die model in the Example of this invention. 本発明の実施例における樹脂の収縮率モデルの一例を示す図である。It is a figure which shows an example of the shrinkage | contraction rate model of resin in the Example of this invention. 本発明の実施例における板厚算出の一例を示す図である。濃淡が板厚のレベルを示している。It is a figure which shows an example of plate | board thickness calculation in the Example of this invention. The shading indicates the level of thickness. 本発明の実施例における樹脂収縮による変形形状の算出例を示す図である。It is a figure which shows the example of calculation of the deformation | transformation shape by resin shrinkage | contraction in the Example of this invention. 本発明の実施例における温調時の金型温度を予測するための温度解析のための熱境界条件の例を示す図である。It is a figure which shows the example of the thermal boundary condition for the temperature analysis for estimating the metal mold | die temperature at the time of the temperature control in the Example of this invention. 本発明の実施例における温調時の金型膨張による熱変形を予測するための金型変形予測の解析条件例を示す図である。It is a figure which shows the example of analysis conditions of the metal mold | die deformation | transformation prediction for estimating the heat deformation by the metal mold | die expansion at the time of the temperature control in the Example of this invention. 本発明の実施例における内圧による金型の変形量予測例を示す図である。It is a figure which shows the deformation | transformation amount prediction example of the metal mold | die by the internal pressure in the Example of this invention. 本発明の実施例における金型の変形と成形品収縮分を合わせ成形品変形形状を予測した図である。It is the figure which predicted the deformation | transformation shape of a molded product combining the deformation | transformation of a metal mold | die and the shrinkage | contraction of a molded product in the Example of this invention.

符号の説明Explanation of symbols

１：コンピュータ
２：補助記憶装置
３：出力装置
４：解析モデル
５：解析モデル読み込み部
６：演算部
７：出力部
８：解析結果
９：成形品形状データ
１０：金型形状データ
１１：成形品条件データ
１２：収縮率データ
１３：金型温調による金型変形量算出部（金型変形量予測部）
１４：成形圧による金型変形量算出部（内圧による金型変形量予測部）
１５：成形品収縮量算出部（成形品収縮量予測部）
１６：成形品形状出力部（成形品変形形状算出部）
１７：金型補正形状出力部（金型補正形状算出部）
１８：成形品変形形状データ
１９：金型補正形状データ 1: computer 2: auxiliary storage device 3: output device 4: analysis model 5: analysis model reading unit 6: calculation unit 7: output unit 8: analysis result 9: molded product shape data 10: mold shape data 11: molded product Condition data 12: Shrinkage rate data 13: Mold deformation amount calculation unit by mold temperature control (mold deformation amount prediction unit)
14: Mold deformation amount calculation unit based on molding pressure (mold deformation amount prediction unit based on internal pressure)
15: Molded product shrinkage calculation unit (molded product shrinkage prediction unit)
16: Molded product shape output unit (molded product deformed shape calculation unit)
17: Mold correction shape output unit (mold correction shape calculation unit)
18: Deformed product shape data 19: Mold correction shape data

Claims (4)

成形品形状データ、金型形状データ、成形条件データ、収縮率データを予め求めておく工程と、
前記成形品形状データ及び収縮率データから、予測の対象とされる成形品の収縮量を算出する工程と、
前記金型形状データ及び前記成形条件データから、室温と温調状態での金型の温度の差を前記金型各部の熱荷重として前記金型の弾性解析を行なうことで前記金型の熱変形量を算出する工程と、
前記金型形状データ及び前記成形条件データから、前記金型キャビティ表面にゲートシール時の内圧を荷重として与え、弾性解析を行なうことで前記内圧による前記金型の変形量を算出する工程と、
前記成形品の収縮量と前記金型の熱変形量と前記内圧による金型の変形量とを用いて、前記成形品の形状を予測する工程と、
を有することを特徴とする成形品形状の予測方法。 A step of obtaining molded product shape data, mold shape data, molding condition data, shrinkage rate data in advance;
From the molded article shape data and the shrinkage ratio data, a step of calculating the amount of shrinkage of the molded article which is predicted for the subject,
From the mold shape data and the molding condition data, thermal deformation of the mold is performed by performing an elastic analysis of the mold using a difference in temperature of the mold between room temperature and a temperature-controlled state as a thermal load of each part of the mold. Calculating the amount;
From the mold shape data and the molding condition data, applying an internal pressure at the time of gate sealing to the mold cavity surface as a load, and calculating an amount of deformation of the mold due to the internal pressure by performing an elastic analysis;
Predicting the shape of the molded article using the amount of shrinkage of the molded article, the amount of thermal deformation of the mold and the amount of deformation of the mold due to the internal pressure ;
A method for predicting the shape of a molded product, comprising: 請求項１に記載の成形品形状の予測方法を、コンピュータに実行させることを特徴とする成形品形状の予測プログラム。 A prediction how the molded article shape according to claim 1, the molded article shape prediction program characterized by causing a computer to execute. 請求項２に記載の成形品形状の予測プログラムを記憶したことを特徴とするコンピュータが読み取り可能の記憶媒体。 Moldings shape prediction program storage medium readable computer characterized by storing the claim 2. 成形品形状データ、金型形状データ、成形条件データ、収縮率データを予め求めておく工程と、A step of obtaining molded product shape data, mold shape data, molding condition data, shrinkage rate data in advance;
前記成形品形状データ及び収縮率データから、予測の対象とされる成形品の収縮量を算出する工程と、A step of calculating a shrinkage amount of a molded product to be predicted from the molded product shape data and shrinkage rate data;
前記金型形状データ及び前記成形条件データから、室温と温調状態での金型の温度の差を前記金型各部の熱荷重として前記金型の弾性解析を行なうことで前記金型の熱変形量を算出する工程と、From the mold shape data and the molding condition data, thermal deformation of the mold is performed by performing an elastic analysis of the mold using a difference in temperature of the mold between room temperature and a temperature-controlled state as a thermal load of each part of the mold. Calculating the amount;
前記金型形状データ及び前記成形条件データから、前記金型キャビティ表面にゲートシール時の内圧を荷重として与え、弾性解析を行なうことで内圧による前記金型の変形量を算出する工程と、From the mold shape data and the molding condition data, applying an internal pressure at the time of gate sealing to the mold cavity surface as a load, and calculating an amount of deformation of the mold due to the internal pressure by performing an elastic analysis;
前記成形品の収縮量と前記金型の熱変形量と前記内圧による金型の変形量とを用いて、前記金型の補正形状を得る工程と、Using the amount of shrinkage of the molded product, the amount of thermal deformation of the mold and the amount of deformation of the mold due to the internal pressure, to obtain a corrected shape of the mold;
前記得られた金型の補正形状によって金型を作成する工程と、Creating a mold with the corrected shape of the obtained mold;
前記作成した金型によって成形品を製造する工程と、A step of producing a molded article by the created mold,
を有することを特徴とする成形品の製造方法。  The manufacturing method of the molded article characterized by having.
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