JPH06288762A - Method for measuring straightness - Google Patents
Method for measuring straightnessInfo
- Publication number
- JPH06288762A JPH06288762A JP9491393A JP9491393A JPH06288762A JP H06288762 A JPH06288762 A JP H06288762A JP 9491393 A JP9491393 A JP 9491393A JP 9491393 A JP9491393 A JP 9491393A JP H06288762 A JPH06288762 A JP H06288762A
- Authority
- JP
- Japan
- Prior art keywords
- points
- measured
- straightness
- inspected
- distance
- 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.)
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- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、長尺被検査体の真直度
の測定方法に関し、特に合成樹脂製の模擬原子燃料棒被
覆管のような柔軟な長尺被検査体の真直度の測定方法に
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 measuring the straightness of a long test object, and more particularly to measuring the straightness of a flexible long test object such as a synthetic nuclear fuel rod cladding tube. It is about the method.
【０００２】[0002]
【従来の技術】図３は従来の長尺被検査体の真直度の測
定方法を示す説明図であり、図ａは平面図，図ｂは側面
図である。図に示す通り、通常、棒状の被検査体１の真
直度を評価する場合には、棒状の被検査体１を定盤２の
上に設置し、湾曲している部分があればその両端３，４
を定盤２に接触させて、湾曲部の頂点５と定盤２との距
離ｄを測定し、この距離ｄを以て真直度を評価する値と
する。2. Description of the Related Art FIGS. 3A and 3B are explanatory views showing a conventional method for measuring the straightness of a long inspection object, wherein FIG. 3A is a plan view and FIG. 3B is a side view. As shown in the figure, usually, when evaluating the straightness of the rod-shaped inspection object 1, the rod-shaped inspection object 1 is placed on the surface plate 2 and if there is a curved portion, both ends 3 thereof are provided. , 4
Is brought into contact with the surface plate 2, the distance d between the apex 5 of the curved portion and the surface plate 2 is measured, and the straightness is evaluated using this distance d.
【０００３】従来の測定方法を具体的に示すならば、以
下の通りになる。 (1) 被検査体１の長さに対して充分な大きさを持つ定盤
２を用意し、この上に被検査体１を設置する。 (2) 被検査体１を定盤２上で回転させ曲がりの有無を確
認する。 (3) 曲がりの部位が確認されれば曲がりの弦の頂点３，
４を定盤２と一致させ、曲がりの弓の部分を定盤２に対
して垂直に立て、弓の頂点５と定盤２との距離ｄを最大
にする。 (4) この弓の頂点５と定盤２との距離ｄを測定し、これ
を真直度を表す尺度とする。A concrete example of the conventional measuring method is as follows. (1) Prepare a surface plate 2 having a size sufficient for the length of the inspection object 1, and place the inspection object 1 on this. (2) Rotate the DUT 1 on the surface plate 2 and check if there is any bending. (3) If the bending part is confirmed, the apex of the bending string 3,
4 is aligned with the surface plate 2, the curved bow portion is erected perpendicularly to the surface plate 2, and the distance d between the apex 5 of the bow and the surface plate 2 is maximized. (4) The distance d between the apex 5 of this bow and the surface plate 2 is measured, and this is used as a scale representing straightness.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、その被
検査体が柔軟なものであれば、例え明らかに曲がってい
るものであっても、定盤上に載せた場合、定盤上から浮
き上がっている部分が自重で変形し定盤にほぼ接した状
態となり、その被検査体固有の曲がり（真直度）を評価
できなくなってしまう。However, if the object to be inspected is flexible, even if it is clearly curved, when it is placed on the surface plate, it rises from the surface plate. The part is deformed by its own weight and is almost in contact with the surface plate, and the bending (straightness) peculiar to the inspected object cannot be evaluated.
【０００５】本発明は上記の問題に鑑み、柔軟な素材の
真直度を適切に評価することのできる方法を得ることを
目的とし、真直度の測定の作業効率を向上させた真直度
の測定方法を得ることを目的とする。In view of the above problems, the present invention has an object to obtain a method capable of appropriately evaluating the straightness of a flexible material, and a straightness measuring method which improves the work efficiency of the straightness measurement. Aim to get.
【０００６】[0006]
【課題を解決するための手段】本請求項１に記載の発明
に係る真直度測定方法では、柔軟な長尺被検査体の真直
度の測定方法であって、前記柔軟な長尺被検査体の上端
を固定して吊下げ、該吊下げられた長尺被検査体の側方
からの正射影長尺被検査体輪郭の長手線上の３カ所以上
の点の座標を測定し、該測定された長手線上の３カ所以
上の点の最上部の点と最下部の点とを結ぶ直線と、他の
点との距離の最大値を求める方法である。A straightness measuring method according to the present invention is a straightness measuring method for a flexible long inspected object, wherein the flexible long inspected object is measured. The upper end of is fixed and hung, the orthogonal projection from the side of the suspended long inspected object is measured, and the coordinates of three or more points on the longitudinal line of the contour of the long inspected object are measured. It is a method of obtaining the maximum value of the distance between the straight line connecting the uppermost point and the lowermost point of three or more points on the longitudinal line and the other points.
【０００７】本請求項２に記載の発明に係る真直度測定
方法では、請求項１に記載の真直度測定方法において、
前記吊下げられた長尺被検査体の側方から平行光を当て
て影を側方平面上に投影して、該影の輪郭の長手線上の
３カ所以上の点の座標を測定し、該測定された長手線上
の３カ所以上の点の最上部の点と最下部の点とを結ぶ直
線と、他の点との距離の最大値を求める方法である。In the straightness measuring method according to the invention described in claim 2, in the straightness measuring method according to claim 1,
Parallel light is applied from the side of the suspended long inspection object to project a shadow on a lateral plane, and the coordinates of three or more points on the longitudinal line of the outline of the shadow are measured, This is a method of obtaining the maximum value of the distance between the straight line connecting the uppermost point and the lowermost point of three or more points measured on the longitudinal line and the other points.
【０００８】[0008]
【作用】本発明においては、柔軟な長尺被検査体の上端
を固定して吊下げ、該吊下げられた長尺被検査体の側方
からの正射影長尺被検査体輪郭の長手線上の３カ所以上
の点の座標を測定し、該測定された長手線上の３カ所以
上の点の最上部の点と最下部の点とを結ぶ直線と、他の
点との距離の最大値を求める方法である。In the present invention, the upper end of a flexible long inspected object is fixed and suspended, and the orthogonal projection from the side of the suspended long inspected object is on the longitudinal line of the contour of the long inspected object. The coordinates of three or more points in the above are measured, and the maximum value of the distance between the straight line connecting the uppermost point and the lowermost point of the three or more points on the measured longitudinal line and the other points is determined. It is a method of seeking.
【０００９】即ち、被検査体の上端を固定して吊下げ、
他端は自由端として吊下げるため、今まで測定が難く、
測定できたとしてもその値の信頼性は低かった柔軟な被
検査体であっても、真直度が測定が可能となる。That is, the upper end of the inspection object is fixed and suspended,
Since the other end is hung as a free end, it has been difficult to measure until now,
Even if it is possible to measure, the straightness can be measured even with a flexible object to be inspected, whose reliability is low.
【００１０】また、具体的な真直度の測定として、吊下
げられた長尺被検査体の側方からの正射影長尺被検査体
輪郭の長手線上の３カ所以上の点の座標を測定し、該測
定された長手線上の３カ所以上の点の最上部の点と最下
部の点とを結ぶ直線と、他の点との距離の最大値（即
ち、真直度）を求めるため、測定操作が煩雑とならな
い。Further, as a specific measurement of straightness, the coordinates of three or more points on the longitudinal line of the orthographic projection of the suspended long inspected object from the side are measured. In order to obtain the maximum value (that is, straightness) of the distance between the straight line connecting the uppermost point and the lowermost point of the three or more points on the measured longitudinal line and the other point, the measurement operation is performed. Is not complicated.
【００１１】即ち、吊下げられた長尺被検査体の側方か
らの正射影長尺被検査体の輪郭の長手線上の任意の点の
座標を光学的操作を用いて測定して、最上部の点と最下
部の点とを結ぶ直線と、他の点との距離の最大値（即
ち、真直度）を測定する。例えば、側方に基準となる座
標軸を設けた平面を設け、真直側方から見た長尺被検査
体の輪郭が基準となる座標軸とどの程度相違するかを測
定してもよい。That is, the orthogonal projection of the suspended long inspection object from the side is measured by an optical operation to determine the coordinates of an arbitrary point on the longitudinal line of the contour of the long inspection object, and the uppermost portion is measured. The maximum value (that is, straightness) of the distance between the straight line connecting the point and the bottom point and the other points is measured. For example, a plane provided with a reference coordinate axis may be provided on the side, and how much the contour of the long inspection object viewed from the straight side differs from the reference coordinate axis may be measured.
【００１２】具体的な真直度の測定操作としては、前記
吊下げられた長尺被検査体の側方から平行光を当てて影
を側方平面上に投影して、該影の輪郭の長手線上の３カ
所以上の点の座標を測定し、該測定された長手線上の３
カ所以上の点の最上部の点と最下部の点とを結ぶ直線
と、他の点との距離の最大値（即ち、真直度）を求める
方法がある。As a specific straightness measuring operation, parallel light is applied from the side of the suspended long inspection object to project a shadow on a lateral plane, and the length of the contour of the shadow is increased. The coordinates of three or more points on the line are measured, and the three points on the measured longitudinal line are measured.
There is a method of obtaining the maximum value (that is, straightness) of the distance between the straight line connecting the uppermost point and the lowermost point of the above points and the other points.
【００１３】[0013]
【実施例】長さ約４ｍ，外径約１０ｍｍ，内径約８ｍｍ
の樹脂製の模擬原子燃料棒用の管材の曲がりを測定し
た。図１は本発明の一実施例の測定方法を示す説明図で
あり、図ａは正面図，図ｂは上面図，図ｃは下端部分を
拡大した正面図である。本発明による測定方法の具体的
な操作は次の通りである。[Example] Length of about 4 m, outer diameter of about 10 mm, inner diameter of about 8 mm
The bending of the pipe material for the simulated nuclear fuel rod made of the above resin was measured. FIG. 1 is an explanatory view showing a measuring method of an embodiment of the present invention, FIG. A is a front view, FIG. B is a top view, and FIG. C is an enlarged front view of a lower end portion. The specific operation of the measuring method according to the present invention is as follows.
【００１４】(1) 被検査体１１の片端１２を治具１３に
挟み保持する。他端１４は自由端として吊下げる。 (2) 被検査体１１の長さ方向に等間隔に基準面からの距
離を測定する。 (3) 座標変換し、被検査体１１両端を結ぶ直線を算出
し、これと被検査体１１の距離を求め、これの最大のも
のをその被検査体の真直度とする。(1) One end 12 of the device under test 11 is sandwiched and held by a jig 13. The other end 14 is suspended as a free end. (2) Measure the distance from the reference plane at equal intervals in the length direction of the DUT 11. (3) Coordinate conversion is performed to calculate a straight line connecting both ends of the object to be inspected 11, the distance between this and the object to be inspected 11 is calculated, and the maximum value of these is taken as the straightness of the object to be inspected.
【００１５】尚、基準面からの距離の測定は、通常直尺
等で行うが、この場合被検査体の揺れや人手による直尺
の保持が困難であると、精度が悪くなるおそれがあり、
また、作業効率が悪い等の不都合が生じる。このため、
次のような対策をとり、この不都合を改善した。The distance from the reference plane is usually measured with a straight scale, but in this case, if the shaking of the object to be inspected or it is difficult to hold the straight scale manually, the accuracy may deteriorate.
In addition, inconvenience such as poor work efficiency occurs. For this reason,
The following measures were taken to improve this inconvenience.
【００１６】(1) 被検査体側面より平行光を当てて影を
側方の基準面に投影する。 (2) この影の位置を測定することによって基準面との位
置を決める。 (1) ３次元空間上に曲線が存在する (2) 曲線上の点Ａ0 ，Ａ1 ，…Ａe までの３次元座標を
測定する。 (3) Ａ0 とＡe とを通る直線を算出し、これと各点との
距離を求める。 (4) このうち最大の距離を、この曲線の真直度とする。(1) A parallel light is applied from the side surface of the object to be inspected and a shadow is projected on a side reference surface. (2) The position with respect to the reference plane is determined by measuring the position of this shadow. (1) A curve exists in a three-dimensional space. (2) Three-dimensional coordinates up to points A 0 , A 1 , ... A e on the curve are measured. (3) A straight line passing through A 0 and A e is calculated, and the distance between this line and each point is calculated. (4) The maximum distance among these is the straightness of this curve.
【００１７】また、図２は測定して得られた座標軸情報
により真直度を測定する計算を模式的に示した説明図で
ある。ｘ，ｙ面との距離は、測定し易いように、影の輪
郭（ｘ，ｙ面から各々遠い方の）で測定するようにし
た。こうしてＰ1 （ｘ1 ，ｙ1，ｚ1 ），…Ｐe （ｘ
e ，ｙe ，ｚe ）座標を求め、点Ｐ1 とＰe を通る直線
との距離が最大の値を曲がりとする。FIG. 2 is an explanatory view schematically showing the calculation for measuring the straightness based on the coordinate axis information obtained by the measurement. The distance to the x and y planes was measured by the contour of the shadow (the one farther from the x and y planes) so as to facilitate the measurement. Thus P 1 (x 1 , y 1 , z 1 ), ... Pe (x
e , y e , z e ) coordinates are obtained, and the curve having the maximum distance between the point P 1 and the straight line passing through P e is taken as the bend.
【００１８】以上のように、本方法は真直度の測定とし
ては近似法であるが被検査体のように通常方法では全く
曲がりを測れないものでも設計要求に応えられる指標を
与えられるという意味において極めて重要な測定方法で
ある。As described above, this method is an approximate method for measuring straightness, but in the sense that an index that can meet the design requirements can be given even if the bending cannot be measured by the normal method, such as the object to be inspected. This is a very important measurement method.
【００１９】また、本実施例では、側方の基準面に平行
光からの影を投影してその影の輪郭の長手線上の点を測
定したが、他の光学的操作を用いて測定してもよい。例
えば、側方に基準となる座標軸を設けた平面を設け、真
直側方から見た長尺被検査体の輪郭が基準となる座標軸
とどの程度相違するかを測定してもよい。また、レーザ
ー光を用いてその反射によって任意の点の座標を求める
等の操作を行ってもよい。Further, in the present embodiment, the shadow from the parallel light is projected on the side reference surface and the point on the longitudinal line of the contour of the shadow is measured, but it is measured by using other optical operation. Good. For example, a plane provided with a reference coordinate axis may be provided on the side, and how much the contour of the long inspection object viewed from the straight side differs from the reference coordinate axis may be measured. Further, an operation such as obtaining the coordinates of an arbitrary point by reflecting the laser light may be performed.
【００２０】[0020]
【発明の効果】本発明は以上説明したとおり、柔軟な長
尺被検査体の上端を固定して吊下げ、該吊下げられた長
尺被検査体の側方からの正射影長尺被検査体輪郭の長手
線上の３カ所以上の点の座標を測定し、該測定された長
手線上の３カ所以上の点の最上部の点と最下部の点とを
結ぶ直線と、他の点との距離の最大値を求める方法であ
る。As described above, the present invention fixes the upper end of a flexible long inspected object and suspends it, and projects the suspended long inspected object from the side by orthogonal projection. The coordinates of three or more points on the longitudinal line of the body contour are measured, and a straight line connecting the uppermost point and the lowermost point of the three or more points on the measured longitudinal line and other points. This is a method of obtaining the maximum value of the distance.
【００２１】即ち、被検査体の上端を固定して吊下げ、
他端は自由端として吊下げるため、今まで測定が難く、
測定できたとしてもその値の信頼性は低かった柔軟な被
検査体であっても、真直度が測定が可能となる。That is, the upper end of the inspection object is fixed and suspended,
Since the other end is hung as a free end, it has been difficult to measure until now,
Even if it is possible to measure, the straightness can be measured even with a flexible object to be inspected, whose reliability is low.
【００２２】また、具体的な真直度の測定として、吊下
げられた長尺被検査体の側方からの正射影長尺被検査体
輪郭の長手線上の３カ所以上の点の座標を測定し、該測
定された長手線上の３カ所以上の点の最上部の点と最下
部の点とを結ぶ直線と、他の点との距離の最大値（即
ち、真直度）を求めるため、測定操作が煩雑とならない
という効果がある。Further, as specific straightness measurement, the coordinates of three or more points on the longitudinal line of the orthographic projection of the long inspected object from the side of the suspended long inspected object are measured. In order to obtain the maximum value (that is, straightness) of the distance between the straight line connecting the uppermost point and the lowermost point of the three or more points on the measured longitudinal line and the other point, the measurement operation is performed. There is an effect that is not complicated.
【図１】本発明の一実施例の測定方法を示す説明図であ
り、図ａは正面図，図ｂは上面図，図ｃは下端部分を拡
大した正面図である。FIG. 1 is an explanatory view showing a measuring method according to an embodiment of the present invention, FIG. A is a front view, FIG. B is a top view, and FIG. C is an enlarged front view of a lower end portion.
【図２】測定して得られた座標軸の情報により真直度を
測定する計算を模式的に示した説明図である。FIG. 2 is an explanatory diagram schematically showing a calculation for measuring straightness based on coordinate axis information obtained by measurement.
【図３】従来の長尺被検査体の真直度の測定方法を示す
説明図であり、図ａは平面図，図ｂは側面図である。3A and 3B are explanatory views showing a conventional method for measuring the straightness of a long inspected object, wherein FIG. 3A is a plan view and FIG. 3B is a side view.
Claims (2)
であって、 前記柔軟な長尺被検査体の上端を固定して吊下げ、 該吊下げられた長尺被検査体の側方からの正射影長尺被
検査体輪郭の長手線上の３カ所以上の点の座標を測定
し、 該測定された長手線上の３カ所以上の点の最上部の点と
最下部の点とを結ぶ直線と、他の点との距離の最大値を
求めることを特徴とする真直度測定方法。1. A method for measuring the straightness of a flexible long inspected object, wherein the flexible long inspected object is hung while fixing the upper end of the flexible long inspected object. Orthogonal projection from the side The coordinates of three or more points on the longitudinal line of the long inspected object contour are measured, and the uppermost point and the lowermost point of the three or more points on the measured longitudinal line are measured. A straightness measuring method characterized by obtaining a maximum value of a distance between a straight line connecting the points and another point.
て、 前記吊下げられた長尺被検査体の側方から平行光を当て
て影を側方平面上に投影して、該影の輪郭の長手線上の
３カ所以上の点の座標を測定し、 該測定された長手線上の３カ所以上の点の最上部の点と
最下部の点とを結ぶ直線と、他の点との距離の最大値を
求めることを特徴とする真直度の測定方法。2. The straightness measuring method according to claim 1, wherein parallel light is applied from a side of the suspended long object to be inspected to project a shadow on a lateral plane, and The coordinates of three or more points on the longitudinal line of the contour are measured, and the distance between the straight line connecting the uppermost point and the lowermost point of the three or more points on the measured longitudinal line and other points A straightness measuring method characterized by finding the maximum value of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9491393A JPH06288762A (en) | 1993-03-31 | 1993-03-31 | Method for measuring straightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9491393A JPH06288762A (en) | 1993-03-31 | 1993-03-31 | Method for measuring straightness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06288762A true JPH06288762A (en) | 1994-10-18 |
Family
ID=14123250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9491393A Pending JPH06288762A (en) | 1993-03-31 | 1993-03-31 | Method for measuring straightness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06288762A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292663A (en) * | 2006-04-26 | 2007-11-08 | Fujifilm Corp | Device and method for measuring straightness, and application method |
| JP2008268229A (en) * | 2008-06-06 | 2008-11-06 | Kao Corp | Fiber shape evaluation method |
| US9864367B2 (en) | 2014-03-25 | 2018-01-09 | Hyundai Motor Company | Straightness management system and control method thereof for mounting pin |
| CN113804147A (en) * | 2021-08-19 | 2021-12-17 | 东风柳州汽车有限公司 | Automatic detection device for straightness of automobile longitudinal beam plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61128112A (en) * | 1984-11-27 | 1986-06-16 | Mitsubishi Rayon Co Ltd | Straightness measurement of pipe and rod |
| JPS61239112A (en) * | 1985-04-16 | 1986-10-24 | Kobe Steel Ltd | Fuel channel measuring instrument |
| JPH04204008A (en) * | 1990-11-30 | 1992-07-24 | Nkk Corp | Method for measuring flatness of steel plate |
-
1993
- 1993-03-31 JP JP9491393A patent/JPH06288762A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61128112A (en) * | 1984-11-27 | 1986-06-16 | Mitsubishi Rayon Co Ltd | Straightness measurement of pipe and rod |
| JPS61239112A (en) * | 1985-04-16 | 1986-10-24 | Kobe Steel Ltd | Fuel channel measuring instrument |
| JPH04204008A (en) * | 1990-11-30 | 1992-07-24 | Nkk Corp | Method for measuring flatness of steel plate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292663A (en) * | 2006-04-26 | 2007-11-08 | Fujifilm Corp | Device and method for measuring straightness, and application method |
| JP2008268229A (en) * | 2008-06-06 | 2008-11-06 | Kao Corp | Fiber shape evaluation method |
| US9864367B2 (en) | 2014-03-25 | 2018-01-09 | Hyundai Motor Company | Straightness management system and control method thereof for mounting pin |
| DE102014219411B4 (en) | 2014-03-25 | 2024-03-07 | Hyundai Motor Company | STRAIGHTNESS MANAGEMENT SYSTEM AND CONTROL METHOD THEREOF FOR MOUNTING PIN |
| CN113804147A (en) * | 2021-08-19 | 2021-12-17 | 东风柳州汽车有限公司 | Automatic detection device for straightness of automobile longitudinal beam plate |
| CN113804147B (en) * | 2021-08-19 | 2024-05-03 | 东风柳州汽车有限公司 | Automatic straightness detection device for automobile longitudinal beam plate |
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