JPH07296191A - Metallic mold draught verifying method for free curved surface - Google Patents
Metallic mold draught verifying method for free curved surfaceInfo
- Publication number
- JPH07296191A JPH07296191A JP6083096A JP8309694A JPH07296191A JP H07296191 A JPH07296191 A JP H07296191A JP 6083096 A JP6083096 A JP 6083096A JP 8309694 A JP8309694 A JP 8309694A JP H07296191 A JPH07296191 A JP H07296191A
- Authority
- JP
- Japan
- Prior art keywords
- plane
- value
- vector
- angle
- point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＣＡＤを用いた３次元
設計における成型品設計方法に関し、より詳細には３次
元的自由曲面上の金型抜き勾配の検証方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for designing a molded product in three-dimensional design using CAD, and more particularly to a method for verifying a die draft on a three-dimensional free-form surface.
【０００２】[0002]
【従来の技術】ＣＡＤを用い３次元設計における成型品
設計を行う際、成型品を金型から取り出しやすくするた
め、抜き勾配の値を考慮することが不可欠である。しか
し従来のＣＡＤ設計システムでは、平面形状に抜き勾配
を付加して形状作成を行うもの（特開 平４−３６１３
７８号）などしかなく、自由曲面上の抜き勾配の値を検
証しながら、より精度の高い成型品設計を行うための検
証手法がなかった。従って、従来は自由曲面上の抜き勾
配の検証を行うために、まず検証すべき形状を検証点か
らＹＺ平面でカット（切断）した断面形状をとり二次元
化した後、その点におけるＺ方向の抜き勾配角度をだ
し、次に同じ形状を同じ検証点からＸＹ平面でカットし
た断面形状をとり、二次元化した後、その点におけるＸ
方向の抜き勾配角度を出す。そして２つの値を比較する
ことによって自由曲面上の抜き勾配角度の 検証を行う
という手法をとっていた。2. Description of the Related Art When designing a molded product in a three-dimensional design using CAD, it is essential to consider the value of the draft in order to make it easier to remove the molded product from the mold. However, in a conventional CAD design system, a draft is added to a planar shape to create the shape (Japanese Patent Laid-Open No. 4-3613).
No. 78) and the like, and there was no verification method for designing a molded product with higher accuracy while verifying the value of the draft on the free-form surface. Therefore, in the past, in order to verify the draft on a free-form surface, first, a cross-sectional shape obtained by cutting (cutting) the verification point on the YZ plane from the verification point is made into a two-dimensional shape, and then the Z direction at that point is measured. Draw the draft angle, then take the same shape from the same verification point on the XY plane to obtain a cross-sectional shape, make it two-dimensional, and then X at that point.
Draw the draft angle of the direction. Then, the method of verifying the draft angle on the free-form surface by comparing the two values was used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の方法では非常に工数がかかる為、数箇所のみ
の大まかなチェックしかできず信頼性も低かったため、
より精度の高い抜き勾配の検証を行いながらの効率的な
３次元設計ができないという問題点を有していた。本発
明は上記課題を解決するもので、３次元的ベクトル値を
平面的に変換させることにより、断面形状をとらずに自
由曲面における勾配角度の検証を行うための、金型抜き
勾配検証方法を提供することを目的としている。However, since such a conventional method requires a great number of man-hours, only a rough check can be made at only a few places and the reliability is low.
There is a problem that an efficient three-dimensional design cannot be performed while verifying the draft with higher accuracy. The present invention solves the above problem, and provides a die drafting gradient verification method for verifying a gradient angle on a free-form surface without taking a cross-sectional shape by converting a three-dimensional vector value in a plane. It is intended to be provided.
【０００４】[0004]
【課題を解決するための手段】本発明は上記目的を達成
するために、３次元的自由曲面上の指示した点における
法線ベクトル値を、ＹＺ平面に投影させたベクトル値に
変換し、その値とＺ軸ベクトルとの内積よりＹＺ平面の
勾配角度を算出する第一段階と、指示した点における法
線ベクトル値を、ＸＹ平面に投影させたベクトル値に変
換し、その値とＸ軸ベクトルとの内積よりＸＹ平面の勾
配角度を算出する第二段階と、算出したそれぞれの値を
比較したうえで指示した点における、抜き勾配角度を求
める第三段階と、勾配角度の変化を識別するために、求
めた勾配角度値にあわせて５゜以下なら赤、１０゜以下
なら黄色．．．という具合に、色分けした円を検証位置
に作成することによって結果表示を行う第四段階からな
る構成としている。In order to achieve the above object, the present invention converts a normal vector value at a designated point on a three-dimensional free-form surface into a vector value projected on a YZ plane, The first step of calculating the gradient angle of the YZ plane from the inner product of the value and the Z axis vector, and converting the normal vector value at the designated point into a vector value projected on the XY plane, and the value and the X axis vector In order to identify the change in the gradient angle, the second step of calculating the gradient angle of the XY plane from the inner product of and, and the third step of calculating the draft angle at the indicated point after comparing the calculated values In accordance with the obtained gradient angle value, red is below 5 ° and yellow is below 10 °. ． ． In other words, the result is displayed by creating a color-coded circle at the verification position.
【０００５】[0005]
【作用】本発明は上記した構成により、抜き勾配の検証
を行いながら３次元設計を行うことにより、設計精度の
向上および、効率化を図ることができる。According to the present invention, with the above-described structure, it is possible to improve the design accuracy and efficiency by performing the three-dimensional design while verifying the draft.
【０００６】[0006]
【実施例】以下、本発明の一実施例の自由曲面における
金型抜き勾配検証方法について図１〜図７を参照しなが
ら説明する。図１は自由曲面における金型抜き勾配検証
方法の全体処理を示すフローチャ−トである。図１で示
すように、本発明によれば検証点Ａをピック（選択）
し、ＹＺ平面，ＸＹ平面それぞれの勾配角度を自動算出
することにより、検証点の抜き勾配角度を即座に表示さ
せることが可能である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for verifying a die draft on a free-form surface according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a flow chart showing the overall processing of the method for verifying the draft of a mold on a free-form surface. According to the present invention, as shown in FIG. 1, the verification point A is picked.
However, it is possible to immediately display the draft angle of the verification point by automatically calculating the gradient angle of each of the YZ plane and the XY plane.
【０００７】図２のフローチャートと図３〜図６を参照
しながら、第一段階および第二段階からなる勾配角度算
出方法の詳細を説明する。まず第一段階としてＹＺ平面
の勾配角度を算出するため点Ａにおける法線ベクトルＢ
の値を出す。そして図３に示すように、その値をＸ成分
がゼロとなるベクトルに変換する。その結果、ベクトル
ＢをＹＺ平面に投影した二次元的ベクトルに置き換え
る。さらに、その値を単位ベクトル化したＣベクトルを
求める。そしてＺ軸に平行でかつ、単位ベクトルとなる
Ｄベクトルの値を出し、図４に示すようにベクトルの内
積よりＣベクトルとＤベクトルのなす角θ１を求め、そ
の角度より検証点Ａの勾 配角度となるθ２を求める。The details of the gradient angle calculating method including the first step and the second step will be described with reference to the flowchart of FIG. 2 and FIGS. First, as a first step, the normal vector B at the point A for calculating the gradient angle of the YZ plane
Give the value of. Then, as shown in FIG. 3, the value is converted into a vector in which the X component is zero. As a result, the vector B is replaced with a two-dimensional vector projected on the YZ plane. Further, a C vector obtained by converting the value into a unit vector is obtained. Then, the value of the D vector that is parallel to the Z axis and becomes the unit vector is obtained, and the angle θ1 formed by the C vector and the D vector is obtained from the inner product of the vectors as shown in FIG. Find the angle θ2.
【０００８】次に同様の手順で、第二段階では、ＸＹ平
面の勾配角度を求める。そして第三段階として、算出さ
れた値を比較したうえで指示した点における抜き勾配角
度を求め、第四段階として図７に示すように勾配角度の
変化を識別するために、求めた勾配角度値にあわせて５
゜以下なら赤１０゜以下なら黄色・・という具合に、色
分けした円１０を検証位置に作成することで検証結果を
わかりやすく表している。以上４段階の構成により、従
来の方法よりもはるかに効率的でかつ、精度の高い自由
曲面における金型抜き勾配角度の検証が行えるようなっ
た。Next, in the second step, the gradient angle of the XY plane is obtained by the same procedure. Then, as a third step, the draft angle at the indicated point is obtained after comparing the calculated values, and as a fourth step, the gradient angle value obtained in order to identify the change in the gradient angle as shown in FIG. To 5
If the degree is less than or equal to 10 degrees, the red is less than 10 degrees, the color is yellow, and so on. With the above four-stage configuration, it has become possible to verify the die draft angle on a free-form surface, which is much more efficient and more accurate than the conventional method.
【０００９】[0009]
【発明の効果】以上の実施例から明らかなように、従来
の方法では工数がかかりすぎて大まかなチェックしかで
きなかった自由曲面における抜き勾配の検証が、本発明
によれば瞬時にＺＹ方向および、ＸＹ方向それぞれから
の角度測定がおこなえるようになったため、常に十分な
検証ができ、確実に自由曲面上の金型抜き勾配の測定を
行いながら３次元設計が出来る手法を提供できるように
なった。As is apparent from the above embodiments, according to the present invention, it is possible to verify the draft in the ZY direction instantaneously by using the conventional method, which requires too many man-hours and can only roughly check. Since the angle measurement from each of the X and Y directions can now be performed, it is possible to always perform sufficient verification, and to provide a method that can reliably perform three-dimensional design while measuring the mold draft on a free-form surface. .
【図１】本発明の一実施例の自由曲面における金型抜き
勾配検証方法の全体処理フローチャ−トFIG. 1 is an overall process flow chart of a method for verifying a die draft on a free-form surface according to an embodiment of the present invention.
【図２】本発明における勾配角度算出方法のフローチャ
ート図FIG. 2 is a flowchart of a gradient angle calculation method according to the present invention.
【図３】検証点の法線ベクトルＢをＹＺ平面に投影させ
た斜視図FIG. 3 is a perspective view in which a normal vector B of a verification point is projected on a YZ plane.
【図４】ベクトルの内積よりＹＺ平面の勾配角度を算出
した側面図FIG. 4 is a side view in which the gradient angle of the YZ plane is calculated from the inner product of vectors.
【図５】検証点の法線ベクトルＢをＸＹ平面に投影させ
た斜視図FIG. 5 is a perspective view in which a normal vector B of a verification point is projected on an XY plane.
【図６】ベクトルの内積よりＸＹ平面の勾配角度を算出
した側面図FIG. 6 is a side view in which the gradient angle of the XY plane is calculated from the inner product of vectors.
【図７】勾配角度の変化を識別するため色分けした結果
表示を表す斜視図FIG. 7 is a perspective view showing a result display that is color-coded to identify a change in gradient angle.
Ａ 検証点 Ｂ，Ｃ，Ｄ，Ｅ，Ｆ ベクトル １０ 色分けした円 A Verification points B, C, D, E, F vectors 10 circles with different colors
Claims (1)
クトル値を、ＹＺ平面に投影させたベクトル値に変換
し、その値とＺ軸ベクトルとの内積よりＹＺ平面の勾配
角度を算出する第一段階と、指示した点における法線ベ
クトル値を、ＸＹ平面に投影させたベクトル値に変換
し、その値とＸ軸ベクトルとの内積よりＸＹ平面の勾配
角度を算出する第二段階と、算出したそれぞれの平面に
おける勾配角度を比較したうえで、指示した点における
勾配角度を求める第三段階と、勾配角度の変化を識別す
るために求めた角度にあわせ色分けした円を検証位置に
作成することによって結果表示を行う第四段階とからな
ることを特徴とする自由曲面における金型抜き勾配検証
方法。1. A method of converting a normal vector value at a designated point on a free-form surface into a vector value projected on a YZ plane, and calculating a gradient angle of the YZ plane from an inner product of the value and the Z axis vector. One step, and a second step of converting the normal vector value at the designated point into a vector value projected on the XY plane and calculating the gradient angle of the XY plane from the inner product of that value and the X axis vector. Comparing the slope angles on each of the above planes, create the third stage to calculate the slope angle at the specified point, and create a color-coded circle at the verification position according to the angle obtained to identify the change in the slope angle. A method for verifying the draft of a metal mold on a free-form surface, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6083096A JPH07296191A (en) | 1994-04-21 | 1994-04-21 | Metallic mold draught verifying method for free curved surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6083096A JPH07296191A (en) | 1994-04-21 | 1994-04-21 | Metallic mold draught verifying method for free curved surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07296191A true JPH07296191A (en) | 1995-11-10 |
Family
ID=13792662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6083096A Pending JPH07296191A (en) | 1994-04-21 | 1994-04-21 | Metallic mold draught verifying method for free curved surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07296191A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000006362A1 (en) * | 1998-07-28 | 2000-02-10 | Fujitsu Limited | Mold design system and computer-readable recording medium having mold design program recorded therein |
| CN103111529A (en) * | 2013-03-20 | 2013-05-22 | 沈阳飞机工业（集团）有限公司 | Machining method of U-shaped sheet metal part resilience mould tire |
-
1994
- 1994-04-21 JP JP6083096A patent/JPH07296191A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000006362A1 (en) * | 1998-07-28 | 2000-02-10 | Fujitsu Limited | Mold design system and computer-readable recording medium having mold design program recorded therein |
| US6917905B2 (en) | 1998-07-28 | 2005-07-12 | Fujitsu Limited | Mold design system and computer-readable recording medium storing mold design program |
| CN103111529A (en) * | 2013-03-20 | 2013-05-22 | 沈阳飞机工业（集团）有限公司 | Machining method of U-shaped sheet metal part resilience mould tire |
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