JPH11156447A - Method and device for deciding heating point and heating line in steel plate bending work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the method for deciding a heating point and a heating line in steel plate bending work by which the heating point and the heating line are decided without using a wooden pattern and which is useful for automatically deciding the heating point and the heating line. SOLUTION: This device has a heating point deciding means 11 by which a target shape data 12 given in a three dimensional coordinate data in a design data of a CAD data, etc., and a steel plate measurement data 13 measuring a surface shape of a steel plate of an object to be worked with laser beam measurement in a three dimensional coordinate data are read and a heating point is decided based on a contact point obtained by rolling a virtual target shape on a virtual steel plate, and a heating line deciding means 14 by which the heating points decided by the heating point deciding means 11 are grouped under a fixed condition and a heating line is decided by connecting the heating points for every group. The heating line data is obtained as a point line data on a steel plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate bending process.
Method and apparatus for determining heating points and heating lines,
Suitable for bending the shell outer plate into a predetermined shape by heating.
It is useful to use. [0002] 2. Description of the Related Art Hull hulls have an underwater
In order to navigate efficiently, complex non-developable curved surface
And a steel plate having a thickness of about 10 to 30 mm. This
In order to process curved outer skin, it is generally called linear heating.
Processing methods have been known for a long time. This is a gas burner
Locally heated the surface of the steel plate by using a method such as
Out-of-plane angular deformation and in-plane shrinkage deformation of steel sheet due to plastic strain
Skillfully utilize and combine to achieve the desired shape
It is a way to get it and is used in many shipyards. [0003] Fig. 13 shows bending of a steel plate serving as an outer plate of a hull.
FIG. 14 is an explanatory view conceptually showing a conventional technique according to a construction method, and FIG.
Shows the wood pattern used for the bending process installed on a steel plate
It is a front view. As shown in both figures, in the prior art
First, the frame line of the hull shell (the aggregate of the shell
Line along this aggregate at the mounting position;
Same. ) As target shapes (10 in the figure)
The wooden mold 1 is set on the steel plate 2. Next, each die 1 and steel plate 2
The operator compares the shapes of the two by visual observation and
Considering the gap between the wooden mold 1 and the steel plate 2, for example,
Consider if the position is heated, it will approach the target shape
Each heating position (heating point) is determined. Specifically, the vertical plane
14 (in the same plane as FIG. 14).
After rolling along the
The heating position and the like are determined more. Then, each heating point on each frame line is
How to tie the steel plate 2 to the target shape
The heating wire is determined in consideration of whether
Then, the determined heating wire 3 is placed on the surface of the steel plate 2 with a chalk or the like.
Mark and heat with a gas burner etc. along this heating line 3.
ing. [0005] SUMMARY OF THE INVENTION As described above, the prior art
The heating wire 3 was decided based on the intuition of the worker for many years.
It was fixed. The bending effect expected from the heating wire 3 is obtained.
Have about 5 years of experience to be able to determine
Are needed and the aging and shortage of skilled technicians
Is causing problems. Also, in the bending work
Includes the production, installation and removal of the wooden mold 1 for the steel plate 2
A lot of work time is taken for band work, and the whole work time is long
It becomes. [0006] As mentioned above, there is a problem of shortage of skilled technicians.
Workers need to go through
To make improvements while considering the know-how
It is necessary to clarify and automate the work. [0007] In view of the above prior art, the present invention uses a wooden mold.
Heating points and heating lines can be determined without
It can also contribute to automatic determination of heating points and heating lines.
Method for determining heating points and heating lines in steel plate bending and
It is intended to provide a device. [0008] [MEANS FOR SOLVING THE PROBLEMS]
Akira considers the work he is performing as a geometric problem.
Understand and process data using geometrical methods
It allows for more automated work and features the following:
Sign. [0009] 1) The target shape of the steel sheet accompanying the bending process
The virtual wood pattern formed with the target shape data
Temporary steel sheet shape measurement data obtained by actually measuring the surface shape
Placed on a imaginary steel plate,
From the reference position, the frame
Rolls along a specific line on a steel plate, such as
The contact points on the steel plate side when the plate contacts at two points are A and B.
And the contacts on the mold side are C and D.
Roll the steel plate in the opposite direction and return it to the reference position.
The contacts A and B after returning to the reference position.
A straight line U connecting the contact points C and D to the straight line U is obtained.
Determining the heating point based on the intersection of lines U and V. 2) The target shape of the steel sheet accompanying the bending process
The virtual wood pattern formed with the target shape data
Temporary steel sheet shape measurement data obtained by actually measuring the surface shape
Placed on a imaginary steel plate,
From the reference position, the frame
Rolls along a specific line on a steel plate, such as
The contact points on the steel plate side when the plate contacts at two points are A and B.
And the contacts on the mold side are C and D.
Roll the steel plate in the opposite direction and return it to the reference position.
The contacts A and B after returning to the reference position.
A straight line U connecting the contact points C and D to the straight line U is obtained.
The heating point is determined based on the intersection of the lines U and V, and
At this heating point based on the intersection angle of the straight lines U and V
To determine the bending angle of the steel plate. 3) A steel sheet bent as described in 1) or 2) above
In the method of determining the heating point in grinding, a certain reference point
After determining the heating point for, or the heating point and the bending angle,
The contacts A and C on the reference point side used in determining the heating point are
Perform the same operation as a new reference point while touching.
Return each heating up to the edge of the steel plate along a specific line
Determining the point or each heating point and each bending angle. 4) With the target shape of the steel sheet accompanying the bending process
Steel obtained by actually measuring certain target shape data and the surface shape of steel plate
Reads actual plate shape measurement data and forms with target shape data
Of a virtual wooden mold that has been
Placed on a imaginary steel plate,
From the reference position, the frame
Rolls along a specific line on a steel plate, such as
The contact points on the steel plate side when the plate contacts at two points are A and B.
And the contacts on the mold side are C and D.
Roll the steel plate in the opposite direction and return it to the reference position.
The contacts A and B after returning to the reference position.
A straight line U connecting the contact points C and D to the straight line U is obtained.
Calculate the three-dimensional coordinates of the heating point based on the intersection of the lines U and V
Having heating point determination means. 5) The target shape of the steel sheet accompanying the bending process
Steel sheet obtained by actually measuring the target shape data and the surface shape of the steel sheet
Read the actual shape measurement data and form with the target shape data.
Virtual wooden molds formed from actual steel sheet shape measurement data
And place the above wooden form or steel plate on the specified base.
Frame line from the standard position in the plane including the cross section of the steel plate
Rolling along a specific line on the steel plate, such as the die and steel plate
A and B are the contacts on the steel plate side when and
At the same time, C and D are the contact points on the wooden side,
Rolls the steel sheet in the opposite direction and returns it to the reference position.
Then, connect the contacts A and B while returning to the reference position.
A straight line U and a straight line V connecting the contacts C and D are obtained, and both straight lines are obtained.
When calculating the three-dimensional coordinates of the heating point based on the intersection of U and V
Both are based on the intersection angle of the straight lines U and V at this time.
Heating point calculation that also calculates the bending angle of the steel sheet at the hot spot
Having a means for determining 6) A steel sheet bent as described in 4) or 5) above
In the device for determining the heating point in the grinding process, a certain reference point
After determining the heating point for, or the heating point and the bending angle,
The contacts A and C on the reference point side used in determining the heating point are
Repeat the same process as a new reference point in the contact state.
Return each heating up to the edge of the steel plate along a specific line
Calculate points, or each heating point and each bending angle. 7) Determined by the method described in 3) above
The starting point is a certain heating point on a certain line based on the
Draw a straight line for the heating point on the other line,
Adjust the parallelism between the wire and the roller wire during the primary bending of the steel sheet.
When the parallelism is within a predetermined range,
Group of each heating point on each line as the heating point of the loop
Make a straight line or curve between each heating point for each group.
To determine the heating wire. 8) Determined by the method described in 3) above
The starting point is a certain heating point on a certain line based on the
Draw a straight line for the heating point on the other line,
Adjust the parallelism between the wire and the roller wire during the primary bending of the steel sheet.
When the parallelism is within a predetermined range,
Group of each heating point on each line as the heating point of the loop
Make a straight line or curve between each heating point for each group.
Determine the heating line by connecting with
The amount of heating at this heating point is based on the bending angle of the plate.
That it is given as 9) Determined by the method described in 3) above
The starting point is a certain heating point on a certain line based on the
Draw a straight line for the heating point on the other line,
Adjust the parallelism between the wire and the roller wire during the primary bending of the steel sheet.
In the case where the parallelism is within a predetermined range,
And based on the bending angle of the steel sheet at the heating point
The same group if the heating amount at the heating point
Grouping of each heating point on each line
And connect each heating point of each group with a straight line or a curve.
To determine the heating line. 10) The heating point determination device described in 6) above
Read the data on the heating point calculated by
Generate a certain heating point on a certain line based on the heating point data.
Draw a straight line to the heating point on another line as a point
Between the straight line of the steel and the roller wire during the primary bending of the steel plate
And if this parallelism is within the specified range,
A group of heating points on each line as a group of heating points
And a straight line or a line between each heating point for each group.
It has a heating line determination unit that calculates the heating line by connecting with a curve
Device for determining heating wire in steel plate bending
Place. 11) The heating point determining device described in 6) above
Data on the heating point and bending angle calculated by
Read, and on a certain line based on the data of each heating point
To the heating point on another line starting from the heating point
Draw a line, and then use this straight line and the roller during the primary bending of the steel plate.
Check the parallelism with the line, and if this parallelism falls within the specified range
If there is a heating point in the same group,
Grouping of heating points is performed, and each heating point for each group is
Connect the lines with a straight line or curve to calculate the heating line and
Each heating based on the bending angle data of the steel sheet at the heating point
A heating line determining means for calculating a heating amount at a point;
When. 12) The heating wire determination device described in 6) above
Data on the heating point and bending angle calculated by
Read, certain based on data of each heating point and bending angle
Heating on another line starting from one heating point on the line
Draw a straight line to the point, primary bending of this straight line and steel plate
Check the parallelism with the roller wire at the time of
Steel at the heating point, if
Heating amount at the heating point determined based on the bending angle of the plate
Are equal to each other as the same group of heating points
Grouping of each heating point
A heating line that connects heating points with a straight line or curve to calculate a heating line
Having decision means. [0021] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described in detail based on FIG. FIG. 1 shows a steel plate bending according to an embodiment of the present invention.
Blocks showing devices for determining heating points and heating lines in machining
FIG. As shown in FIG.
Reads target shape data 12 and steel plate measurement data 13
The steel sheet is subjected to a predetermined process (detailed later)
2 (see FIG. 12, etc .; the same applies hereinafter).
You. Here, the target shape data 12 is set as CAD data or the like.
Data as three-dimensional coordinate data
The shape measurement data 13 is a laser measurement of the surface shape of the steel plate 2.
Is given as three-dimensional coordinate data actually measured.
The heating line determining means 14 determines the heating line determined by the heating point determining means 11.
Predetermined processing (detailed later) is performed based on the information of the hot spot.
The heating wire 3 on the steel plate 2 (see FIG. 14;
Same. ). Heating determined by heating line determining means 14
The line 3 is sent to the output device 15 as point sequence data of three-dimensional coordinates.
Will be issued. Thus, the heating wire 3 via the output device 15
Information is obtained as point sequence data of three-dimensional coordinates. But
Therefore, based on the point sequence data of the heating wire 3,
Controlling the position of a heating means, for example, a high-frequency heating coil,
Automation of the steel sheet bending process can be realized. Also, output device
15 to the steel sheet 2 based on the point sequence data given through
Control the position of the marking device that marks the hot wire 3
With this configuration, the heating wire 3 is automatically marked on the steel plate 2.
Can be The display device 16 displays the heating point and the heating line.
Visualization of information associated with various processes of the
Function as an external input device for information necessary for processing.
You. FIG. 2 shows one example of the processing performed by the heating point determining means 11.
It is an explanatory view for explaining an example. In FIG. 2, 1 'is an explanation.
2 ′ is a similar virtual steel plate for
You. Here, “virtual” means that
Rather than displaying as electronic data or this
What exists as a figure visible and represented on the device 16
Say. Also, the processing of this example is conventionally performed by an operator.
In the same manner as described above, the contact with the steel plate 1 'is confirmed while rolling the wooden mold 2'.
This is to determine the heating point. So, this
This is referred to as “contact confirmation method”. As shown in FIG. 2A, the bending in this case is
The steel plate 2 'to be processed is a tune subjected to primary bending
It is assumed that the surface
The plate 2 'has a curved surface shape that changes smoothly when observed microscopically.
Instead of having a plane
It is considered a set. For example, as shown in FIG.
In this way, it is more constant than the M line which is the center line in the plate width direction
And a plane at a certain angle b.
It is bent to have a degree. On the other hand,
The target shape is given as shown in FIG. There
First, the wooden mold 1 'is moved from the initial position shown in FIG.
Roll along the beam line, as shown in FIG.
Next, the wooden mold 1 'is brought into contact with the steel plate 2'. Steel plate at this time
The contacts on 2 ′ are A and B, and the contacts on 2 ′ are C and D
And Next, the wooden mold 1 'is rolled in the opposite direction, and FIG.
As shown in FIG. 2C, the original initial state (shown in FIG.
State). The state where the wooden mold 1 'has been returned to the initial state as described above
A straight line U connecting the contacts A and B and a straight line V connecting the contacts C and D
Is obtained, and the intersection point P and the intersection angle θ are obtained. This
The heating point is determined based on the intersection P of
(3 ° in FIG. 2) is defined as the bending angle at the heating point.
Actually, the intersection point P is extended vertically upward in FIG.
The position is a heating position. This heating position is heated and the angle θ
FIG. 2 (e) shows a case in which only bending is performed. It is shown in the figure
As described above, the contact B of the steel plate 2 'is formed by the wooden shape due to the heating at this time.
1 'is in contact with the contact point D, and the shape of the steel plate 2' is the target shape.
(The shape of the wooden mold 1 '). Strictly
For example, there is a gap between the intersection P and the heating position based on this.
(The coordinates about the Z axis which is the vertical position are different.)
However, in the bending process, from the intersection P to the contacts B and D
Since the lengths of the straight lines U and V are sufficiently longer than the angle θ,
Processed assuming that P and the heating position based on this are the same position
However, there is no problem in practice. Next, the contact point C of the wooden mold 1 'is connected to the contact point A.
As the reference position corresponding to the initial position described above.
(The operations shown in FIGS. 2 (b) to 2 (d))
The heating point and the bending angle θ at the heating point.
You. This operation is repeated until the wooden form 1 'is extended to the end of the steel plate 2'.
Rolled to successive heating points and bending angles at the heating points
Degree θ is determined. FIG. 3 shows a heating point determined by the heating point determining means 11.
The display screen of the display device 16 when it is determined is conceptually
FIG. FIG. 5A shows the initial position, and FIG.
When the mold 1 'is moved by one rotation, and (c), the wooden mold 1' is
This is the case of rotating. FIG. 4 shows a processing object according to the present embodiment.
It is explanatory drawing which shows notionally the relationship of stripping of the steel plate. same
As shown in the drawing, in the present embodiment, one of the cylindrical surfaces having a radius R is set.
Consider a hypothetical steel plate 2 'whose part is taken out as shown in the figure.
To approximate this cylindrical surface by bending, use a circle
Fold along the center axis of the tube so that the cross section is polygonal
Just do it. That is, the target shape is roughly regarded as a cylindrical surface.
Roller reference as indicating the direction of the central axis when
Line 16 'is defined. In the case shown in FIG.
The M line, which is the center line, is the roller reference line 16 '
It is the case where it intersects. Roller reference line 16 '
And the M line are not always in such a relationship
No. For example, they form part of the hull shell
Of course, the roller reference line 16 'coincides with the M line
In some cases. FIG. 5 shows one example of the processing performed by the heating line determining means 14.
It is an explanatory view for explaining an example. Of the heating wire in this case
The determination is made by temporarily determining the heating points determined by the heating point determination means 11.
Imaginary straight line, and draw this straight line on the virtual steel plate 2 '.
Check the parallelism with the virtual roller line 16 "
Groups with parallelism of
It is divided into two groups and is based on the roller line 16 "
Grouping is performed for the middle upper side and the lower side. What
Contact, F in FIG.₁~ F₇Is a virtual frame line
And the suffix added to the code F
This is the frame line number. In addition, each frame line F₁~
F₇A number of points that are short and perpendicular to the heating points are heating points. As shown in FIG. 5A, first, a starting point 1 is determined.
From the starting point 1 of the mushroom to each frame line F₁~ F₇Heating on
A virtual straight line (shown by a dotted line in FIG. 5) is drawn toward the point.
Good. Here, the starting point is the one with the lower frame line number, and
From the roller roller 16 ". Next, as described above, each frame line is started from the starting point 1.
In F₁~ F₇Virtual straight line drawn toward the upper heating point
Of the roller line 16 ″.
As a result, when the parallel or intersection angle is
Grouping is performed as one group of heating points. FIG.
(A) relates to the parallelism in this case based on the starting point 1
Heating points of the same group that satisfy the conditions are frame lines
F_Three, F_FourRepresents that there was. Based on starting point 1
When the grouping as described above is completed, FIG.
As shown, in the same procedure, the group based on the starting point 2
Divide. FIG. 5B shows a group based on the starting point 1.
The heating point belonging to 1 is determined, and the heating point based on the starting point 2
Is being confirmed. At this time,
Regarding the grouped heating points,
Not subject to grouping. Roller in this way
Grouping the heating points below line 16 ".
After the grouping is completed, as shown in FIG.
And a straight line (or curve) from the heating point sequence for each group
Is calculated as a virtual heating line 3 '. Heating wire 3 '
If this is a straight line, use the least squares method, etc.
In the case of a line, it is obtained by spline interpolation or the like. FIG. 6 shows a case where a heating point is obtained by the contact confirmation method.
Specific procedure (implementation)
It is a flowchart which shows an example). In this embodiment, the frame
The heating point is found on the m-line, but of course it is not limited to this.
Not something. However, the frame line attaches the aggregate
Since the line corresponds to the position
Is provided as design data, and
There is an advantage that can be. Based on FIG.
explain. 1) Read design data such as CAD data
The target shape of the steel sheet as three-dimensional data.
(Step S₁reference). 2) Measure the shape of the steel plate to be processed
To obtain the three-dimensional coordinate data (step S_Tworeference).
This is the image of the image taken by laser measurement or camera
Processing by any of the existing measurement methods.
obtain. 3) Step for each frame line
S_FourTo step S₁₄(Step S_Threethree
See). Here, step S_ThreeAs described in the block
The "... loop" is the step (in this case,
Is Step S_Three) Consider the later processing as one loop
Processing belonging to the loop, for example, as in the case of this example,
This means that it repeats sequentially for each frame line.
Same below. ). Step S _ThreeSo first, the frame line number
The next step S with the number i set to “1”_FourMove to processing
You. "FLMAX" is the maximum frame line number.
(The same shall apply hereinafter). 4) Since there is no heating point at first,
J = 0 is set as the initial value of the hot spot number (step S
_Fourreference). 5) Record the position and orientation of the target shape
(Step S_Fivereference). Specifically, for example,
Reference point (curve indicating the target shape of the frame line and outlook
Intersection of lines, that is, a point indicating an M-line of a virtual wooden mold)
Mark and inclination of line of sight (inclination with respect to horizontal or vertical)
Angle). The condition at this time is
In the work to be used, the part along the target shape of the wooden
Place the midpoint of the minute on the M line of the steel plate and set the line of sight vertically
Corresponds to the retained initial state. 6) Rotate the target shape along the steel plate
Tep S₆), Until this reaches the end of the steel plate
(Step S₇Along with that rolling)
Is detected at two points (step S₈
See “Principle of contact confirmation method” above.
To calculate the coordinates of the intersection P and the angle θ
(Step S₉, Step S_Ten, Step S₁₁And
Tep S₁₂reference). 7) Add "1" to the heating point number and specify
The data of each heating point in the frame line of
(Step S₁₃And step S₁₄reference). At this time
Heating point data is for each frame line number and each heating point number
Given as three-dimensional coordinate and angle data
You. 8) Step S₇In the judgment process of
If it is detected that the
Frame line number is the frame line that performs the heating point determination process.
Whether the number is larger than the maximum value (FLMAX)
If frame line number i <FLMAX, then
Step S for the frame line with the number_Four~ Step
S₁₄Is repeated. Here, step S_FourBack to
Each time, "1" is added to the frame line number i. this
As a result, when the frame line number i ≧ FLMAX,
Processing for finding a predetermined heating point for all frame lines
The heating point determination process
(Step S_FifteenAnd step S ₁₆reference). 9) Step S₈Contacted at 2 points
If not detected, step S_FiveReturn to processing
Step S_Five~ Step S₇Is repeated. sand
That is, the target shape is rotated by a certain angle in one process, and two points
Step S until contact is detected at_Five~ Step S₇
Is repeated. Therefore, the frame to find the heating point
If the shape of the steel sheet along the
Step S without asking₇Reached the end in the processing of
Detected and a heating point exists for the frame line
Proceed to the next frame line
You. Two points of contact detected for all frame lines
Not applicable, that is, when the entire steel plate is flat,
The heating point cannot be determined by the "contact confirmation method".
No. Therefore, the heating point is determined by this method.
Steel sheets are not primarily bent by bending rolls, etc.
Is required. The above step S₆Processing in the target form
Shape was rotated along the steel plate, but this
It is the same even if it turns along. In short, the point of contact between the two
Rotate one relative to the other to obtain
Good. Also, the purpose of finding the heating point as described above is necessary.
Heating position and heating intensity to give shape change
To obtain the amount of heat). Between heating intensity and angle θ
Have a certain relevance, which must be determined experimentally.
Can be. Therefore, when the angle θ is determined,
Degree (of course, angle θ
If recorded, it can be converted later when needed
Noh. ). Therefore, the process for finding the heating point is directly
There is no relation, but step S₁₄At the angle θ
And the heating intensity for the angle θ
May be. FIGS. 7 to 10 show plots based on the determined heating points.
Specific example of the heating line determining means 14 for obtaining a heating line
9 is a flowchart showing a simple procedure (example). these
The procedure will be described with reference to FIG. The following processing is performed as shown in FIG. 1) Input heating point data (step S)_{twenty one}three
See). Specifically, step S in FIG.₁₄Each frame obtained in
3D coordinates and angle data of each heating point
Input data. 2) Initially, a predetermined group has not been formed
Therefore, set g = 0 as the initial value of the group number g.
(Step S_{twenty two}reference). 3) Step for each frame line
S_{twenty four}~ Step S₅₄(Step S_{twenty three}three
See). 4) Upper heating point of frame line number i
It is determined whether or not the number HPU (i)> 0 (step
S_{twenty four}). Here, the “upper heating point HPU” is a roller
Of the upper heating point when the upper and lower sides are determined based on the line 16 "
Number, for example, each frame line and roller line 1
The one having a larger Y coordinate than the intersection with 6 ″ is defined as the upper side.
Thus, if there is an upper heating point, HPU (i)
> 0, in which case step S_{twenty five}Move to processing
You. 5) Each upper module on frame line number i
Step S for hot spot₂₆~ Step S₃₈Perform the processing of
(Step S_{twenty five}reference). That is, the heating point number j = 1 to H
A similar process is performed for each heating point of PU (i) to
Make a split. 6) Check whether grouping has been completed
Judgment (Step S₂₆reference). Specifically,
The group number g is assigned to the target heating point.
Is determined. 7) Step S₂₆As a result of the judgment of
If the target heating points are not grouped
In this case, “1” is added to the group number g (step S₂₇
reference). Since the initial value of the group number g is “0”,
Action for first heating point for first frame line
For example, a group number g = 1 is assigned. 8) The heating point to be treated
Tep S₂₇Assign the group number g assigned in (Step
Top S₂₈reference). 9) The number of heating points belonging to the group
"1" (step S₂₉reference). 10) Step S above₂₇~ Step S₂₉
To determine the starting point. 11) After the frame line number i
Step S for each frame line ₃₁~ Step S₃₇
(Step S₃₀reference). The frame at this time
Let the line number be k = (i + 1) to FLMAX. 12) Each upper line of frame line number k
Step S for hot spot₃₂~ Step S₃₆Perform the processing of
(Step S₃₁reference). 13) Frame of frame line number k
Are certain heating points on the line grouped?
Is determined (step S₃₂reference). Specifically,
A group number g is assigned to the heating point to be judged.
It is determined whether or not it has been performed. 14) Step S₃₂Judgment result
Heating points are not grouped
In this case, the position parallel to the roller line 16 "when viewed from the starting point
Is determined (step S₃₃reference). With one example
And the heating point that is the starting point
Connect the hot spot with a straight line and make a pair with this straight roller line 16 ".
Is detected, and when this angle is smaller than a predetermined value.
Is determined to be in a parallel position. In addition, both straight lines
Measure the distance between the roller line 16 "at the end and
To detect if it is within a certain range
The same determination can be made even when the above is performed. 15) Step S₃₃Judgment result
Heating point is parallel to the roller line 16 "
If it is determined that the position is at the position,
A similar group number g is assigned (step S₃₄three
See). 16) Step S₃₄Group granted in
Add “1” to the number of heating points belonging to number g (step
S₃₅reference). 17) Step S₃₅When processing of is completed
If step S₃₂Of the heating point that was determined in the processing of
If grouping is completed or step S₃₃Processing
If it is detected that does not have the predetermined parallelism in
Is determined as belonging to the frame line number k.
Is the maximum value of the heating point number 1
Step S until it becomes larger than HPU (k)₃₂~ St
Top S₃₅Is repeated (step S₃₆reference). here
Then, step S₃₆To step S₃₂Heating point number every time
"1" is added to the number. Thus a specific frame line
A grouping of the heating points on the channel is performed. 18) Step S₃₆In the processing of
Group of all upper heating points on the frame line with in number k
If it is detected that the loop division has been completed,
Step S₃₁~ Step S₃₆Processing of the frame
Until the number k becomes larger than the maximum value FLMAX
Repeat (Step S₃₇reference). Here, step S₃₇
To step S₃₁"1" is added to the frame number k every time
Is added. Thus, when the frame line number is i
Grouping of upper heating points for frame line
Will be 19) Step S₂₆In the processing of
In-number i is subject to judgment on the frame line
Or if the heating points have been grouped
S₃₇All frames with frame line number i and subsequent
The grouping of upper heating points for the line has been completed.
Is detected, the frame line number i
Of the heating points that are subject to the determination as belonging to
The heating point number j becomes larger than the maximum value HPU (i).
Until step S₂₆~ Step S₃₈Repeat the process
(Step S₃₈reference). Here, step S₃₈From
Top S₂₆"1" is added to the heating point number each time the process returns to.
Thus, for the upper heating point on frame line number i
Grouping is performed. The following processing is performed as shown in FIG. 20) Step S_{twenty four}Of the frame line number i
The absence of an upper heating point for the frame line
If detected or step S₃₈Origin belongs to the process of
Group for all upper heating points of the flame line
If it is detected that the
For the lower heating point on the in
Perform grouping. That is, step S_{twenty four}~ Step
S₃₈Step S corresponding to each process of₃₉~ Step S₅₃
Is performed for the lower heating point. Step S₃₉In "below
Side heating point HPL "is the upper
Heating point that has the opposite relationship to the upper heating point when determining the lower
It is. That is, the heating point below the roller wire 16 "
Means, for example, each frame line and roller line 1
The one having a smaller Y coordinate than the intersection with 6 ″ is defined as the lower part. 21) Step S₃₉In the processing of
There is a lower heating point for the frame line with IN number i
If no is detected or step S₅₃In the process of
For all lower heating points of the frame line to which the origin belongs
If it is detected that the grouping has ended,
Determine whether the frame line number is greater than FLMAX
If smaller, step on each frame line.
S_{twenty four}~ Step S₅₃Repeat the process of
When the process is completed for the
Grouping of all heating points belonging to the
If so, the process proceeds to the next process (step S₅₄reference). The following processing is performed as shown in FIG. 22) For each group of heating points
For each group, connect the heating points in a straight line
Straight line by the least squares method or spline interpolation from the coordinates of the hot spot
Alternatively, a heating line is derived by calculating a curve (step S₅₅Passing
And step S₅₆reference). Step S₅₅At
"G_NOIs the maximum number of groups. 23) Group number ≧ G_NO  In a relationship
Is detected, that is,
If it is detected that the heating wire 3 has been found,
Ends the processing (step S₅₇And step S₅₈reference). FIG. 10 shows each heating point during the processing shown in FIG.
Taking into account the heating intensity (determined by the bending angle θ)
And the information of this heating intensity was also included in the information of the heating wire.
This is an example. As shown in FIG.
S₅₆In the next process, the heating intensity
The cloth is calculated (step S₅₉reference). In this case,
Thermal intensity is directly calculated separately based on the bending angle θ at the heating point.
Information about the bend angle θ given or at the heating point
Derived based on the information. According to this embodiment, each heating point on each heating wire 3
Can be heated with the most appropriate amount of heat. This is an example
For example, in the case of bending by high-frequency heating, use a high-frequency coil.
The amount of heat input to the steel plate 2 is controlled by controlling the supplied current.
This is easily realized by FIG. 11 is a flowchart of the processing shown in FIG. 7 and FIG.
The heating intensity at each heating point (determined by the bending angle θ)
You. ), And this heating intensity is also the
This is an embodiment taken as an example. As shown in the figure,
In this embodiment, step S₃₃Or step S₄₈Next
In the process, the same heating intensity as the starting point (within the predetermined tolerance)
Including ) Is determined.
(Step S₆₀reference). Then, as a result of this determination,
If it is not, remove it from the group.
Manage. In other words, the condition is that the heating intensity is the same.
Then, the same group number as the starting point is assigned. According to this embodiment, each heating point on each heating wire 3
Can be heated with the same amount of heat. This allows
For example, in the case of bending by high-frequency heating, one heating
For line 3, the current supplied to the high-frequency coil is kept constant.
The most appropriate heat input to the steel plate
be able to. Note that, in the above-described embodiment, “virtual”
The "target" is not a real thing but an electronic
And visualize it on the display device 16
Is defined as something that exists as a figure
In the technical idea according to the present invention, it is necessary to add such a limitation.
No need. It is a wooden form and a steel plate that exist as reality.
If available, for example, wooden molds and steel
A board is also included in the concept of "virtual" here. [0072] The present invention has been described in detail with the embodiments.
According to the invention described in [Claim 1],
The deviation of the surface shape of the steel sheet from the target shape
Can be solved as a geometry problem based on the contact points
Anyone can easily set the appropriate heating wire without skill
Can be determined. [Claim 2]
According to this, not only the heating wire but also the bending angle (heating amount) is the same.
Can be determined at times. [Claim 3]
According to Ming, all heating points on a particular line of steel sheet are determined.
Can be specified. [Claim 4] to [Claim 6]
According to the described invention a heating point or a heating point and a bending angle
Can be automatically determined. According to the invention described in [Claim 7],
A person can easily determine an appropriate heating wire.
According to the invention described in [Claim 8], an appropriate heating wire and
Even if the heating amount on the heating wire is different,
The data of the heating line in consideration of the change in the amount of heat can be created.
According to the invention described in [Claim 9], on one heating wire
Are grouped so that the amount of heating is the same
With a heating wire that can improve the efficiency of the heating work
Can be easily provided. [Claim 10] to [Claim 11]
According to the invention described in (1), an appropriate heating wire is automatically created
can do. Based on this heating wire data,
For example, to control the position of heating means such as a high-frequency heating device
Automatic bending of predetermined steel plates can be performed.
You. FIG. 12 is a diagram showing the heating line determined according to the present invention.
Steel plate shape before and after heating
Are displayed as contour lines. FIG. 12A shows the state before heating.
In contour display, the difference between the steel plate shape and the target shape is determined by the color difference.
Is displayed. The blue part in the center is the target shape
Is 5mm, and the red part at the end of the steel plate is 50mm.
The deviation from the target shape goes from the center to the end.
This indicates that the size has increased. In contrast,
FIG. 12 (b) shows the heating of the steel sheet along the heating wire of the present invention.
In the display when you see, there are many blue parts
This indicates that the target shape is remarkably approached. sand
That is, it is sufficiently useful without using the wooden mold according to the prior art.
The heating line can be determined.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an apparatus for determining a heating point and a heating line in steel sheet bending according to an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating an example of a process performed by a heating point determining unit 11 of FIG. FIG. 3 is an explanatory diagram showing a display example of a display device 16 accompanying processing performed by a heating point determining unit 11 of FIG. 1; FIG. 4 is an explanatory view conceptually showing the relationship of stripping of a steel plate 2 to be processed according to the present embodiment. FIG. 5 is an explanatory diagram for explaining an example of a process performed by a heating line determining unit 14 in FIG. 1; FIG. 6 is a flowchart showing an embodiment for determining a heating point. FIG. 7 is a flowchart (part 1) showing a first embodiment for determining a heating line. FIG. 8 is a flowchart showing a first embodiment for determining a heating line (part 2). FIG. 9 is a flowchart (part 3) showing a first embodiment for determining a heating line. FIG. 10 is a flowchart showing a part of a second embodiment for determining a heating line. FIG. 11 is a flowchart showing a part of a third embodiment for determining a heating line. FIG. 12 is a schematic diagram showing contours of the shape of a steel sheet to show experimental results for confirming the effects of the present invention. FIG. 13 is an explanatory view conceptually showing a conventional technique relating to a method of bending a steel plate serving as an outer plate of a hull. FIG. 14 is a front view showing a state in which a wooden pattern used for bending a steel sheet according to the related art is installed on the steel sheet. FIG. 15 is a perspective view showing a state in which a heating wire determined in the related art is attached to a steel plate. [DESCRIPTION OF REFERENCE NUMERALS] 11 heating point determining unit 12 the target shape data 13 steel shape measurement data 14 heating line determining unit 16 "roller lines A, B, C, D contacts P intersection U, V linear F ₁ to F ₇ frameline θ Bending angle

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Eiji Koiwa             No. 1-1 Akunouracho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             In Nagasaki Shipyard Co., Ltd. (72) Inventor Fukumi Hamaya             No. 1-1 Akunouracho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             In Nagasaki Shipyard Co., Ltd. (72) Inventor Shoji Kawano             8-20 Asahicho, Nagasaki-shi, Nagasaki PAL Corporation             In the structure (72) Inventor Takeshi Nakahama             8-20 Asahicho, Nagasaki-shi, Nagasaki PAL Corporation             In the structure

Claims (1)

Claims: 1. A virtual wooden mold formed by target shape data which is a target shape of a steel plate associated with a bending process is formed by steel plate shape measurement data obtained by actually measuring the surface shape of the steel plate. Placed on a virtual steel plate, the wooden mold or the steel plate rolls along a specific line on the steel plate such as a frame line in a plane including a cross section of the steel plate from a predetermined reference position, and When the steel plate contacts the steel plate at two points, the contacts on the steel plate are A and B, and the contacts on the wooden die are C and D. Then, the wooden die or the steel plate is rolled in the opposite direction and returned to the reference position. In this manner, a straight line U connecting the contacts A and B and a straight line V connecting the contacts C and D are obtained in the state of returning to the reference position, and a heating point is determined based on an intersection of the straight lines U and V. A method for determining a heating point in steel sheet bending. 2. A virtual wooden mold formed by target shape data, which is a target shape of a steel sheet accompanying bending, is placed on a virtual steel sheet formed by steel sheet shape measurement data obtained by actually measuring the surface shape of the steel sheet. Placed, the die or steel plate rolls along a specific line on the steel plate, such as a frame line, in a plane including the cross section of the steel plate from a predetermined reference position, and the die and the steel plate are fixed at two points. The contacts on the steel plate side in case of contact are A and B, and the contacts on the wooden mold side are C and D. Then, the wooden mold or the steel plate is rolled in the opposite direction and returned to the reference position. In the state returned to the position, a straight line U connecting the contacts A and B and a straight line V connecting the contacts C and D are determined, and a heating point is determined based on the intersection of the straight lines U and V. Determine the bending angle of the steel sheet at this heating point based on the intersection angle of V A method for determining a heating point in steel sheet bending. 3. The method for determining a heating point in steel sheet bending according to [1] or [2], wherein after determining a heating point with respect to a certain reference point, or a heating point and a bending angle, The same operation is repeated as a new reference point with the contact points A and C on the reference point side used in determining the heating point in contact with each other, and each heating point until reaching the end of the steel sheet along a specific line. Or a method for determining a heating point in steel plate bending, wherein each heating point and each bending angle are determined. 4. A virtual wooden form formed by the target shape data is read by reading target shape data, which is a target shape of the steel plate accompanying the bending process, and steel plate shape measurement data obtained by actually measuring the surface shape of the steel plate. It is placed on a virtual steel plate formed by shape measurement data, and the wooden mold or steel plate is rolled from a predetermined reference position along a specific line on the steel plate, such as a frame line, in a plane including the cross section of the steel plate. When the die and the steel plate contact at two points, the contacts on the steel plate side are A and B, and the contacts on the wooden shape side are C and D, and then the die or steel plate is rolled in the opposite direction. To return to the reference position, a straight line U connecting the contacts A and B and a straight line V connecting the contacts C and D are obtained in the state returned to the reference position, and based on the intersection of the two straight lines U and V, A heating point determining means for calculating three-dimensional coordinates of the heating point; A device for determining a heating point in steel plate bending. 5. A virtual wooden form formed by the target shape data is read by reading target shape data, which is a target shape of the steel plate associated with the bending process, and steel plate shape measurement data obtained by actually measuring the surface shape of the steel plate. Placed on a virtual steel plate formed by shape measurement data, the wooden pattern or the steel plate from a predetermined reference position in a plane including a cross section of the steel plate, etc.,
Rolls along a specific line on the steel plate, and when the wooden mold and the steel plate contact at two points, the contacts on the steel plate side are A and B, and the contacts on the wooden mold side are C and D. The mold or the steel plate is rolled in the opposite direction and returned to the reference position, and in this state returned to the reference position, a straight line U connecting the contacts A and B and a straight line V connecting the contacts C and D are obtained. , Both straight lines U,
A heating point determining means for calculating the three-dimensional coordinates of the heating point based on the intersection point of V, and also calculating the bending angle of the steel sheet at this heating point based on the intersection angle of the straight lines U and V at this time; Device for determining the heating point in steel sheet bending. 6. A device for determining a heating point in steel plate bending according to [4] or [5], wherein after determining a heating point with respect to a certain reference point, or a heating point and a bending angle, The same process is repeated as a new reference point with the contact points A and C on the reference point side used in determining the heating point in contact with each other, and each heating point until reaching the end of the steel sheet along a specific line. Or a heating point determining apparatus in a steel sheet bending process, wherein each heating point and each bending angle are calculated. 7. A straight line is drawn from a heating point on a certain line as a starting point to a heating point on another line based on the heating point determined by the method described in [3]. Examine the parallelism with the roller wire at the time of the primary bending of the steel sheet, and when this parallelism falls within a predetermined range, group the heating points on each line as heating points of the same group, and A method of determining a heating line in a steel sheet bending process, wherein a heating line is determined by connecting each heating point with a straight line or a curve. 8. A straight line is drawn from a heating point on a certain line to a heating point on another line based on the heating point determined by the method described in [3]. Examine the parallelism with the roller wire at the time of the primary bending of the steel sheet, and when this parallelism falls within a predetermined range, group the heating points on each line as heating points of the same group, and A steel sheet bending characterized in that a heating line is determined by connecting each heating point with a straight line or a curve and a heating amount at this heating point is given as data based on a bending angle of the steel sheet at each heating point. How to determine the heating wire in processing. 9. A straight line is drawn from a heating point on a certain line to a heating point on another line based on the heating point determined by the method described in [3]. The degree of parallelism with the roller wire during the primary bending of the steel sheet is examined, and the amount of heating at the heating point when the parallelism is within a predetermined range and is determined based on the bending angle of the steel sheet at the heating point. When the heating points are the same, the heating points on each line are grouped as heating points of the same group, and the heating lines are determined by connecting the heating points of each group with a straight line or a curve to determine the heating line. How to determine the heating wire in processing. 10. A data relating to a heating point calculated by the heating point determining device according to [6] is read, and a certain heating point on a certain line is used as a starting point on another line based on the data of each heating point. Draw a straight line for the heating point, and examine the parallelism between this straight line and the roller wire at the time of primary bending of the steel sheet. If this parallelism is within a predetermined range, each line is regarded as a heating point of the same group. The above-mentioned heating points are grouped, and the heating lines in the steel sheet bending process are characterized by having heating line determining means for calculating a heating line by connecting the heating points of each group with a straight line or a curve. apparatus. 11. Data relating to a heating point and a bending angle calculated by the heating point determining apparatus according to [6] is read, and a certain heating point on a certain line is set as a starting point based on the data of each heating point. Draw a straight line for the heating point on the line, and examine the parallelism between this straight line and the roller wire at the time of primary bending of the steel sheet. If this parallelism is within a predetermined range, the heating point of the same group The heating points on each line are divided into groups, and the heating points are calculated by connecting the heating points of each group with a straight line or a curve, and based on the bending angle data of the steel sheet at each heating point. A heating line determining means for calculating a heating amount in the step (b), wherein the heating line is determined in a steel sheet bending process. 12. A data relating to a heating point and a bending angle calculated by the heating line determination device described in [6] is read, and a certain heating point on a certain line is determined based on the data of each heating point and the bending angle. A straight line is drawn for a heating point on another line as a starting point, and the parallelism between the straight line and the roller wire at the time of the primary bending of the steel sheet is examined.If the parallelism is within a predetermined range, And, when the heating amount at the heating point determined based on the bending angle of the steel sheet at the heating point is equal, the heating points on each line are grouped as the same group of heating points, and between the heating points of each group. A heating line determining means for calculating a heating line by connecting the lines with a straight line or a curve.