KR102560913B1 - A Curvature Analysis Method for plate - Google Patents

Abstract

The present invention comprises the steps of preparing a target plate; Pressing the target plate member to form a first curved plate member; 3-dimensionally scanning the first curved board to generate a plurality of coordinate values for a predetermined position of the first curved board; Setting a maximum deformation line of the first curved plate member based on a plurality of coordinate values of the first curved plate member; Setting a heating direction reference line of the first curved plate member based on a maximum deformation line of the first curved plate member; And a method for measuring the curvature of a plate member comprising the step of measuring the curvature at any one point of the first curved plate member based on a plurality of coordinate values of the first curved plate member, the curvature of the plate member In measuring, it is possible to provide a method for measuring the curvature of a plate material that can consider only the minimum elements.

Description

Method for measuring the curvature of a plate {A Curvature Analysis Method for plate}

The present invention relates to a method for measuring the curvature of a plate material, and more particularly, to a method for measuring the curvature of a plate material in which a hot forming apparatus can automatically perform hot forming and in which only minimum elements can be considered in measuring the curvature of a plate material. it's about

The plate member of the outer plate constituting the outer circumferential surface of the ship forms an atypical curved surface to reduce the resistance caused by the fluid during the ship's navigation.

As a method of forming such an atypical curved surface, there is a method of cutting a flat plate into blocks when building a ship, processing the cut flat plate in block units into a curved plate, and welding the processed curved plates together.

In addition, as another method of forming an atypical curved surface, there is a method of processing a flat plate into a curved plate. At this time, in the process of processing the flat plate into a curved plate, a worker applies heat to the flat plate using a heat source such as a gas torch to shrink, A line heating process is used that expands, bends and transforms to be processed into a curved plate of a desired shape.

This uses a shape in which plastic deformation occurs when the surface of a flat plate, which is an object, is locally heated, resulting in out-of-plane angular deformation or in-plane contraction deformation. do it repeatedly.

On the other hand, during the heating operation, the worker measures the curvature using a template, a pre-made wooden measurer, to check whether the curvature of the heated workpiece plate fits the planned curvature, and the manufactured curved plate is the template The desired curved plate is considered to have been fabricated when it is in full contact with the

However, since the process of operating the workpiece plate according to the linear heating method is performed manually, the efficiency of the work is low, and in order to perform accurate curved surface processing, various factors such as accurate heating position, heating speed, cooling position, cooling speed, etc. It is necessary to know the processing information of eggplant, but this is often influenced by the proficiency of the operator, so the work result was not constant.

In addition, since the work of forming a curved plate by the linear heating method is a work that is continuously exposed to high heat and noise, it is known that it can cause various diseases that adversely affect the health of workers, and is considered to be a work to be avoided.

Therefore, it is a plate material that can be practically commercialized, which can produce work results of a certain level without being affected by the proficiency of workers, minimize health problems that may occur to workers, and increase work efficiency by enabling simultaneous work. The development of a hot forming system of is required.

In addition, when the hot forming apparatus automatically performs hot forming, it is necessary to determine whether the curvature of the curved sheet material is formed with a predetermined curvature. In measuring the curvature of such a sheet material, many factors must be considered. there is

Korean Patent Publication No. 1999-0074014

An object of the present invention is to provide a hot forming method of a plate material that can produce a certain level of work result without being affected by the skill level of the operator.

In addition, an object of the present invention is to provide a method for measuring the curvature of a plate material that can consider only minimum factors in measuring the curvature of a plate material.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above-mentioned problems, the present invention comprises the steps of preparing a target plate; Pressing the target plate member to form a first curved plate member; 3-dimensionally scanning the first curved board to generate a plurality of coordinate values for a predetermined position of the first curved board; Setting a maximum deformation line of the first curved plate member based on a plurality of coordinate values of the first curved plate member; Setting a heating direction reference line of the first curved plate member based on a maximum deformation line of the first curved plate member; and measuring the curvature at an arbitrary point of the first curved plate member based on the plurality of coordinate values of the first curved plate member.

In addition, in the present invention, the maximum deformation line of the first curved plate member is, based on the target plate member, among the edge regions including the vertices of the first curved plate member, among the deformed curved surfaces of the first curved plate member It provides a method for measuring the curvature of a plate material, characterized in that it is a virtual line connecting at least two points of maximum deformation.

In addition, the present invention, the first curved plate member, the first vertex (A); a second vertex (B) located in the X-axis direction of the first vertex (A); a third vertex (C) facing the first vertex (A) and located in the Y-axis direction of the second vertex (B); And a fourth vertex (D) located in the Y direction of the first vertex (A) and facing the second vertex (B). a first line segment connecting the vertex (A) and the second vertex (B); a second line segment connecting the second vertex (B) and the third vertex (C); a third line segment connecting the third vertex (C) and the fourth vertex (D); and a fourth line segment connecting the fourth vertex D and the first vertex A, wherein the maximum deformation line of the first curved plate member is a virtual line connecting the vertices of the first curved plate member. In this case, the heating direction reference line of the first curved plate member and the maximum strain line of the first curved plate member are the same, and the maximum strain line of the first curved plate member is a virtual line positioned along the line segment. In the case of a line, the heating direction reference line of the first curved plate member and the maximum strain line of the first curved plate member are perpendicular to each other.

In addition, the present invention, based on the plurality of coordinate values of the first curved plate member, the step of measuring the curvature at any one point of the first curved plate member, the plurality of coordinates of the first curved plate member Based on the values, selecting three random points among the first curved plates; And measuring an angle of an obtuse angle in an obtuse triangle constituted by the arbitrary three points, and selecting an arbitrary three points among the first curved sheet materials is to heat the first curved sheet material. Provided is a method for measuring the curvature of a plate material, characterized in that three points located in the same direction as the direction reference line are selected.

In addition, in the present invention, the arbitrary three points constitute three vertices of P1 (x1, y1, z1), P2 (x2, y2, z2), and P3 (x3, y3, z3), and the P1 (x1, Among the three arbitrary points of y1, z1), P2 (x2, y2, z2), and P3 (x3, y3, z3), P2 (x2, y2, z2) is used as the reference for the heating direction of the first curved plate Assuming that it is a midpoint located on the line, the length of the line segment from P1 (x1, y1, z1) to P2 (x2, y2, z2) is b, and from P2 (x2, y2, z2) to P3 (x3, y3) , z3) assuming c, the length of the line segment from P3 (x3, y3, z3) to P1 (x1, y1, z1) as a, Assuming that the interior angle is θ, the interior angle θ at P2 (x2, y2, z2) provides a method for measuring the curvature of a plate material, characterized in that Equation 1 below.

... Equation 1

In addition, in the present invention, the length b of the line segment from the P1 (x1, y1, z1) to the P2 (x2, y2, z2) is the P1 (x1, y1, z1) and the P2 (x2, y2, z2) ), and the length c of the line segment from P2 (x2, y2, z2) to P3 (x3, y3, z3) is the P2 (x2, The length of the line segment is measured based on the Z-axis coordinate values of y2, z2) and P3 (x3, y3, z3), and from P3 (x3, y3, z3) to P1 (x1, y1, z1) The length a of the line segment to is the curvature measuring method of the plate material, characterized in that the length of the line segment is measured based on the Z-axis coordinate values of the P3 (x3, y3, z3) and the P1 (x1, y1, z1) to provide.

According to the present invention as described above, it is possible to provide a hot forming method of a plate material capable of producing a certain level of work result without being affected by the skill level of the operator.

In addition, the present invention can provide a method for measuring the curvature of a plate material that can consider only minimum factors in measuring the curvature of the plate material.

In addition, in the present invention, in performing the hot forming, the heating of the first curved sheet material, which is set based on the maximum strain line of the first curved sheet material, rather than proceeding with the hot forming in an arbitrary non-directional direction By performing the hot forming through the directional reference line, the efficiency of the hot forming can be improved.

In addition, in the present invention, three random points located in the same direction as the heating direction reference line of the first curved plate material are selected, and the heating direction reference line of the first curved plate material is based on the Z-axis coordinate value Since the selection has been made, in measuring the curvature at any one point of the first curved plate, considering only one coordinate value, that is, the Z-axis coordinate value, any one point of the first curved plate curvature can be measured.

In addition, in the present invention, in setting the heating direction line for any one point at which the degree of curvature is poor, since the heating direction reference line of the first curved plate is set as a reference, the heating direction line By proceeding with hot forming along, it is possible to improve the efficiency of hot forming.

1 is a schematic diagram for explaining how a worker creates a plurality of lines on a plate material.
Figure 2 is a flow chart for explaining the hot forming method of the plate material according to the present invention.
Figure 3 is a flow chart for explaining the steps of preparing the target plate according to the present invention.
4A to 4C are schematic diagrams for explaining the generation of a plurality of coordinate values for a predetermined position of a first curved plate member according to the present invention.
5A and 5B are schematic diagrams for explaining setting the maximum deformation line of the primary curved plate member.
6A and 6B are schematic diagrams for explaining setting a heating direction reference line of a primary curved plate member.
Figure 7 is a schematic flow chart for explaining the step of measuring the curvature at any one point of the first curved plate member according to the present invention.
8 is a schematic diagram for explaining a step of selecting a degree of curved surface shaping at an arbitrary point.
9 is a schematic flowchart for explaining the step of selecting a heating direction line for one arbitrary point with a poor degree of curvature, and FIG. It is a schematic diagram for explaining the step of selecting the heating direction line.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings below, specific details for the practice of the present invention will be described in detail. Like reference numbers refer to like elements, regardless of drawing, and "and/or" includes each and every combination of one or more of the recited items.

Although first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

The spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe a component's correlation with other components. Spatially relative terms should be understood as including different orientations of elements in use or operation in addition to the orientations shown in the drawings. For example, if you flip a component that is shown in a drawing, a component described as "below" or "beneath" another component will be placed "above" the other component. can Thus, the exemplary term “below” may include directions of both below and above. Elements may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram for explaining how a worker creates a plurality of lines on a plate material.

As shown in FIG. 1, the worker 12 draws the plurality of lines 11 on the plate 10 based on expert knowledge about the material of the plate, the thickness of the plate, and the amount of curvature to be deformed. Depending on the need for hot forming, it is appropriately produced.

That is, the position to be hot-formed in the plate 10, that is, the plurality of lines 11 (11a, 11b) is determined by expert knowledge about the material of the plate, the thickness of the plate, and the amount of curvature to be deformed. As such, since the variables of necessity of hot forming are diverse, generating the plurality of lines 11 corresponds to an area that cannot be automated until now.

Accordingly, it is difficult to automate the hot forming method of the plate material, and therefore, the present applicant has developed the following method in order to automate the hot forming method of the plate material.

Figure 2 is a flow chart for explaining the hot forming method of the plate material according to the present invention, Figures 4a to 4c is for explaining the generation of a plurality of coordinate values for a predetermined position of the first curved plate material according to the present invention It is a schematic drawing.

First, referring to FIGS. 2 and 4A , the method of hot forming a plate material according to the present invention includes preparing a target plate material 100 (S100).

In this case, the target plate is a plate for performing hot forming. Hereinafter, for convenience of description, the target plate for performing the hot forming will be defined as a target plate.

The target plate 100 is hot-formed and corresponds to an outer plate constituting the outer circumferential surface of a ship, and such a target plate must form an atypical curved surface in order to reduce resistance due to fluid during sailing of the ship.

However, the type of the target plate is not limited in the present invention.

At this time, the target plate may be defined as follows.

That is, the target plate according to the present invention, the longitudinal direction of the target plate (X direction in Fig. 4a); a width direction of the target plate member located on the same plane as the longitudinal direction of the target plate member (Y direction in FIG. 4A); And a height direction (Z direction in FIG. 4A) of the target plate material located on a vertical plane from the longitudinal direction of the target plate material and the width direction of the target plate material. At this time, the direction in which the target plate material extends long is the target plate material. can be defined in the longitudinal direction of

Meanwhile, preparing the target plate may include the following steps.

Figure 3 is a flow chart for explaining the steps of preparing the target plate according to the present invention.

First, referring to FIG. 3 , the step of preparing the target plate includes preparing a design surface drawing for hot forming the target plate (S101).

The design surface drawing is a drawing in which the hot-formed target plate, which is the final object, is programmed as a three-dimensional curved surface, and can be designed through a three-dimensional design program such as ANSYS, NASTRAN, CATIA or SOLID works. Since this corresponds to matters obvious in the art, a detailed description thereof will be omitted below.

Next, referring to FIG. 3 , the step of preparing the target plate includes preparing a design plane drawing by developing the design curved surface drawing into a plane (S102).

Developing the design curved surface drawing into a plane can be performed through the 3D design program as described above, and since this corresponds to an obvious matter in the art, a detailed description thereof will be omitted.

Next, referring to FIG. 3 , the step of preparing the target plate includes preparing the target plate by cutting the raw material plate according to the design plan drawing (S103).

That is, by cutting the raw material plate according to the design plan drawing, unnecessary regions can be cut out in hot forming the target plate.

By the above method, the target plate can be prepared.

Continuously referring to FIGS. 2 and 4B , the method of hot forming a plate material according to the present invention includes forming the first curved plate material 110 by pressing the target plate material (S110).

Pressing the target plate material to form the first curved plate material is to minimize the amount to be curved by the hot forming by preliminary pressing the target plate material before proceeding with the hot forming described later. am.

For example, pressing the target plate material to form the first curved plate material may be to form 70 to 80% of the amount to be finally formed into an atypical curved surface.

At this time, pressing the target plate may be pressed through a known pressing roller, which is obvious in the art, so detailed descriptions thereof will be omitted below.

However, the present invention does not limit the presence or absence of the step of forming a curved surface in the target plate through pressing.

On the other hand, the target plate may be defined as follows.

That is, the first curved plate member according to the present invention includes a longitudinal direction of the first curved plate member (X direction in FIG. 4B); a width direction of the first curved plate member located on the same plane as the longitudinal direction of the first curved plate member (Y direction in FIG. 4B); And a height direction (Z direction in FIG. 4B) of the first curved plate member located on a vertical plane from the longitudinal direction of the first curved plate member and the width direction of the first curved plate member. The direction in which the primary curved plate member extends may be defined as the longitudinal direction of the primary curved plate member.

Continuing to refer to FIGS. 2 and 4C , in the hot forming method of the plate material according to the present invention, the first curved plate material is three-dimensionally scanned, and a plurality of shapes are formed at a predetermined position of the first curved plate material 110. It includes generating coordinate values (S120).

That is, the position of the first curved plate may be subdivided by grid coordinates, for example, a1. You can set the location with coordinates such as a2, a3..., b1, b2, b3..., c1, c2, c3..., etc.

At this time, the coordinate values are divided into X-axis, Y-axis, and Z-axis values, and a predetermined position of the first curved plate can be set as a three-dimensional coordinate. For example, a1 (Xa1, Ya1, Za1) It can be set to coordinates, it can be set to the coordinates of b1 (Xb1, Yb1, Zb1), and it can be set to the coordinates of c1 (Xc1, Yc1, Zc1).

In addition, generating a plurality of coordinate values for a predetermined position of the first surface of the first curved plate 110 may use a method of generating a general three-dimensional coordinate value, for example, the present applicant Referring to Korean Registered Patent No. 10-1920610 filed and registered, a plurality of coordinate values for a predetermined position of the first surface of the first curved plate member 110 may be generated.

At this time, generating a plurality of coordinate values for a predetermined position of the first surface of the first curved plate 110 is, for example, a coordinate value is generated through a computer program, and the coordinate value is displayed through a known display. Since it is possible to display, which corresponds to a general matter, a detailed description thereof will be omitted.

Meanwhile, in the present invention, in the step of generating a plurality of coordinate values for a predetermined position of the first curved plate 110, the coordinate values of the edge region including the vertex of the first curved plate and the first Coordinate values of the inner region of the secondary curved plate can be created.

Continuing to refer to FIG. 2 , in the hot forming method of the sheet material according to the present invention, based on a plurality of coordinate values of the first curved sheet material 110, the maximum deformation line of the first curved sheet material is set. It includes the step of doing (S130).

At this time, in the present invention, the term "maximum deformation line of the first curved plate material" refers to the deformation of the first curved plate material among the edge regions including the vertices of the first curved plate material based on the target plate material. It means an imaginary line that connects at least two maximally deformed points among curved surfaces.

More specifically, the imaginary line connecting at least two points that are most deformed among the deformed curved surfaces of the first curved plate member is the Z-axis coordinate value of the target plate member and the Z-axis of the first curved plate member. It can be based on coordinate values.

For example, assuming that the Z-axis coordinate value of the target plate before the forming of the curved surface is "0", in the case of the first curved plate, since the forming of the curved surface has proceeded, the first curved surface The Z-axis value of the plate has various values.

At this time, at least having the largest Z-axis coordinate value among the edge regions including the vertices of the first curved plate, using an arbitrary point where the Z-axis coordinate value of the first curved plate is “0” as a reference point. It is possible to select two points and set the maximum strain line of the first curved plate through a virtual line connecting the at least two points.

5A and 5B are schematic diagrams for explaining setting the maximum deformation line of the primary curved plate member.

First, referring to Figure 5a, the first curved plate member, the first vertex (A); a second vertex (B) located in the X-axis direction of the first vertex (A); a third vertex (C) facing the first vertex (A) and located in the Y-axis direction of the second vertex (B); and a fourth vertex D located in the Y direction of the first vertex A and facing the second vertex B.

At this time, in FIG. 5A, the largest Z-axis coordinate of the edge region including the vertex of the first curved plate, using an arbitrary point where the Z-axis coordinate value of the first curved plate is “0” as a reference point Assuming that at least two points having values are the first vertex A and the third vertex C, a virtual line connecting the first vertex A and the third vertex C is the first vertex A and the third vertex C. It corresponds to the maximum deformation line of the second curved plate.

However, the Z-axis value at the first vertex (A) and the Z-axis value at the third vertex (C) may be the same maximum value. Alternatively, the Z-axis value at the first vertex (A) is the maximum value, and the Z-axis value at the third vertex (C) may correspond to the subsequent maximum value of the Z-axis value at the first vertex (A).

Through this, it is possible to select at least two points having the largest Z-axis coordinate value among the edge regions including the vertices of the first curved plate. At this time, in the present invention, at least two points having the largest Z-axis coordinate value As described above, two points may be understood as a concept including not only the case where the at least two points have the same maximum value, but also the case where the maximum value and subsequent maximum values are included.

Next, referring to Figure 5b, the first curved plate member, the first vertex (A); a second vertex (B) located in the X-axis direction of the first vertex (A); a third vertex (C) facing the first vertex (A) and located in the Y-axis direction of the second vertex (B); and a fourth vertex D located in the Y direction of the first vertex A and facing the second vertex B.

In addition, the first curved plate member, the first line segment connecting the first vertex (A) and the second vertex (B); a second line segment connecting the second vertex (B) and the third vertex (C); a third line segment connecting the third vertex (C) and the fourth vertex (D); and a fourth line segment connecting the fourth vertex D and the first vertex A.

At this time, in FIG. 5B, the largest Z-axis coordinate of the edge region including the vertex of the first curved plate, using an arbitrary point where the Z-axis coordinate value of the first curved plate is “0” as a reference point At least two points having a value are along a first line segment connecting the first vertex A and the second vertex B and a third line segment connecting the third vertex C and the fourth vertex D. At this time, the line of the first line and the line of the third line correspond to the maximum deformation line of the first curved plate.

However, the Z-axis value in the line of the first line segment and the Z-axis value in the third line segment may be the same maximum value. Unlike this, the Z-axis value in the line of the first line segment is the maximum value, The Z-axis value in the third line segment may correspond to the next maximum value of the Z-axis value in the line of the first line segment.

Through this, it is possible to select at least two points having the largest Z-axis coordinate value among the edge regions including the vertices of the first curved plate. At this time, in the present invention, at least two points having the largest Z-axis coordinate value As described above, two points may be understood as a concept including not only the case where the at least two points have the same maximum value, but also the case where the maximum value and subsequent maximum values are included.

Continuing to refer to FIG. 2 , the method of hot forming a sheet material according to the present invention includes the step of setting a heating direction reference line of the first curved sheet material based on the maximum strain line of the first curved sheet material. Includes (S140).

In this case, in the present invention, the term "reference line in the heating direction of the first curved plate material" corresponds to a reference line indicating a direction in which the hot forming is performed during hot forming of the first curved plate material.

That is, in the present invention, in proceeding with hot forming, rather than proceeding with hot forming in any non-directional direction, as described above, set based on the maximum strain line of the first curved sheet material, the first By performing the hot forming through the reference line in the heating direction of the primary curved plate member, the efficiency of the hot forming can be improved.

6A and 6B are schematic diagrams for explaining setting a heating direction reference line of a primary curved plate member.

First, referring to Figure 6a, as in the above-described Figure 5a, the first curved plate member, the first vertex (A); a second vertex (B) located in the X-axis direction of the first vertex (A); a third vertex (C) facing the first vertex (A) and located in the Y-axis direction of the second vertex (B); and a fourth vertex (D) located in the Y direction of the first vertex (A) and facing the second vertex (B), wherein the first vertex (A) and the third vertex (D) are located. An imaginary line connecting the vertices C corresponds to the maximum strain line of the primary curved plate.

At this time, when the maximum strain line of the first curved plate is a virtual line connecting the vertices of the first curved plate, the heating direction reference line of the first curved plate according to the present invention is the first curved surface. The maximum strain line of the plate material may be set as a reference line in the heating direction of the first curved plate material.

That is, in the present invention, when the maximum strain line of the first curved plate is a virtual line connecting the vertices of the first curved plate, the heating direction reference line of the first curved plate and the first curved plate The maximum strain line of is the same.

Next, referring to Figure 6b, as in the above-described Figure 5b, the first curved plate member, the first line segment connecting the first vertex (A) and the second vertex (B); a second line segment connecting the second vertex (B) and the third vertex (C); a third line segment connecting the third vertex (C) and the fourth vertex (D); And a fourth line segment connecting the fourth vertex D and the first vertex A, wherein the line of the first segment and the line of the third segment are at the maximum deformation line of the first curved plate. applicable

At this time, when the maximum strain line of the first curved plate is a virtual line located along the line segment, the heating direction reference line of the first curved plate according to the present invention is the maximum of the first curved plate A line perpendicular to the deformation line may be set as a reference line in the heating direction of the primary curved plate.

That is, in the present invention, when the maximum strain line of the first curved sheet material is a virtual line located along a line segment, the reference line in the heating direction of the first curved sheet material and the maximum strain line of the first curved sheet material The deformation line is positioned in a vertical state.

Continuing to refer to FIG. 2 , in the hot forming method of a plate material according to the present invention, the curvature at any one point of the first curved plate material is determined based on a plurality of coordinate values of the first curved plate material. It includes the step of measuring (S150).

Figure 7 is a schematic flow chart for explaining the step of measuring the curvature at any one point of the first curved plate member according to the present invention.

7, in the step of measuring the curvature at any one point of the first curved plate according to the present invention, based on a plurality of coordinate values of the first curved plate, the first curved plate Among them, a step of selecting 3 random points is included (S151).

At this time, in the present invention, selecting random 3 points among the first curved sheet materials is characterized by selecting random 3 points located in the same direction as the heating direction reference line of the first curved sheet material do.

In addition, the arbitrary three points form a triangle, and in the case of the triangle, P1 (x1, y1, z1), P2 (x2, y2, z2), P3 (x3, y3, z3) constituting three vertices will do

At this time, it is preferable to configure arbitrary three points so that any one of the interior angles at the three vertices at any three points can be an obtuse angle, so that the triangle formed by the arbitrary three points becomes an obtuse triangle. desirable.

Next, referring to FIG. 7, in the step of measuring the curvature at one arbitrary point of the first curved plate member according to the present invention, the angle of the obtuse angle in the obtuse triangle formed by the arbitrary three points is measured. It includes the step of doing (S152).

As described above, in the present invention, it is preferable to configure arbitrary three points so that a triangle formed by the arbitrary three points becomes an obtuse triangle. At this time, the P1 (x1, y1, z1), P2 (x2 , y2, z2), P3 (x3, y3, z3), the P2 (x2, y2, z2) of any three points, the middle point located on the reference line in the heating direction of the primary curved plate material Assuming, the interior angle of P2 (x2, y2, z2) constitutes an obtuse angle, and the interior angle at P2 (x2, y2, z2) can be derived by the second law of cosines.

For example, b is the length of the line segment from P1 (x1, y1, z1) to P2 (x2, y2, z2), and the length of the line segment from P2 (x2, y2, z2) to P3 (x3, y3, z3) is Assuming that the length is c, the length of the line segment from P3 (x3, y3, z3) to P1 (x1, y1, z1) is a, and the interior angle at P2 (x2, y2, z2) is θ, The interior angle θ at P2 (x2, y2, z2) can be derived as in Equation 1 below.

... Equation 1

At this time, in the present invention, the length b of the line segment from P1 (x1, y1, z1) to P2 (x2, y2, z2) is the P1 (x1, y1, z1) and P2 (x2, y2, z2) The length of the line segment can be measured based on the Z-axis coordinate value of, and the length c of the line segment from P2 (x2, y2, z2) to P3 (x3, y3, z3) is the P2 (x2, y2 , z2) and the length of the line segment based on the Z coordinate values of P3 (x3, y3, z3), and also from P3 (x3, y3, z3) to P1 (x1, y1, z1) The length a of the line segment may be measured based on the Z-axis coordinate values of P3 (x3, y3, z3) and P1 (x1, y1, z1).

In the present invention, the lengths a, b, and c of the line segments can be measured based on the Z-axis coordinate value, that is, it is not necessary to consider the X-axis coordinate value and the Y-axis coordinate value. Arbitrary 3 points are selected among the curved plate materials because 3 points located in the same direction as the heating direction reference line of the first curved plate material are selected.

That is, in the present invention, as described above, since the heating direction reference line of the first curved plate material is selected based on the Z-axis coordinate value, in the same direction as the heating direction reference line of the first curved plate material It is possible to measure the lengths a, b, and c of the line segments at three arbitrary points located on the basis of the Z-axis coordinate value without considering the X-axis coordinate value and the Y-axis coordinate value.

As a result, in the present invention, three random points located in the same direction as the heating direction reference line of the first curved plate material are selected, and the heating direction reference line of the first curved plate material is based on the Z-axis coordinate value Since the selection has been made, in measuring the curvature at any one point of the first curved plate, considering only one coordinate value, that is, the Z-axis coordinate value, any one point of the first curved plate curvature can be measured.

As described above, in the present invention, in measuring the curvature at any one point of the first curved plate material according to the present invention, three random points are selected among the first curved plate materials, and the arbitrary three points are selected. Arbitrary 3 points are constructed so that any one of the interior angles at the three vertices at a point can be an obtuse angle, so that a triangle formed by the arbitrary 3 points is an obtuse triangle, and the arbitrary 3 points are formed. By measuring the angle of the obtuse angle in the obtuse triangle constituted by, it is possible to measure the curvature of any one point of the first curved board according to the present invention, that is, the point corresponding to the obtuse angle among any three points. there is.

Continuing to refer to FIG. 2, in the hot forming method of the plate material according to the present invention, the curvature value at any one point measured of the first curved plate material corresponds to the arbitrary one point in the design curved surface drawing. and comparing the curvature values of the points to be (S160).

That is, the curvature value at any one point measured by the above-described step S150 and the curvature of a point corresponding to the arbitrary one point in the design curve drawing for hot forming the target plate By comparing the values, the degree of completion of the curved forming of the first curved plate member is determined.

Continuing to refer to FIG. 2, in the hot forming method of the plate material according to the present invention, the curvature value at any one point measured of the first curved plate material corresponds to the arbitrary one point in the design curved surface drawing. Comparing the curvature values of the points to be formed, and selecting the degree of curvature shaping at the arbitrary point (S170).

For example, the curvature value at any one point measured of the primary curved plate member and the curvature value of a point corresponding to the arbitrary one point in the design curved surface drawing are the same, or the primary curved surface If the curvature value at any one point measured of the plate and the curvature value at the point corresponding to the arbitrary one point on the design surface drawing are within the tolerance range, the level of curvature forming at the arbitrary one point The degree may be selected as good, and, on the other hand, the curvature value at any one point measured of the first curved plate and the curvature value at the point corresponding to the arbitrary one point in the design curved surface drawing are allowed If it exceeds the range, the level of the curved surface molding may be selected as defective.

8 is a schematic diagram for explaining a step of selecting a degree of curved surface shaping at an arbitrary point.

As shown in FIG. 8, by comparing the curvature value at any one point measured of the first curved plate and the curvature value of a point corresponding to the arbitrary one point in the design curve drawing, the first If the curvature value at any 1 point measured on the car curved plate and the curvature value at the point corresponding to the arbitrary 1 point on the design surface drawing are the same and are within the tolerance range, it is selected as good (green) , otherwise, if it exceeds the tolerance range, it can be selected as defective (blue).

Continuing to refer to FIG. 2, in the hot forming method of the plate material according to the present invention, the heating direction line for any one point of which the degree of curved forming is defective among any one point of the first curved plate material. It includes the step of selecting (S180).

Hereinafter, the step of selecting the heating direction line according to the present invention will be described in more detail.

9 is a schematic flowchart for explaining the step of selecting a heating direction line for one arbitrary point with a poor degree of curvature, and FIG. It is a schematic diagram for explaining the step of selecting the heating direction line.

9 and 10, in the step of selecting a heating direction line for any one point at which the degree of curvature is poor, the degree of curvature of any one point of the first curved plate is One random point that is defective is selected (S171).

Since this is the same as the step S160 described above, a detailed description thereof will be omitted.

Next, referring to FIGS. 9 and 10, in the step of selecting a heating direction line for any one point at which the degree of curved surface forming is poor, based on the maximum deformation line of the first curved plate material, the A heating direction reference line of the primary curved plate is set (S172).

Since this is the same as the step S140 described above, a detailed description thereof will be omitted.

That is, the steps S171 and S172 are selected or set by the previous step.

Next, referring to FIGS. 9 and 10, in the step of selecting a heating direction line for any one point at which the degree of curved surface forming is poor, based on the heating direction reference line of the first curved plate, A step of setting a heating direction line for one arbitrary point at which the level of curvature is poor (S173).

That is, in the present invention, in setting the heating direction line for any one point where the degree of curvature is poor, it is characterized in that the heating direction reference line of the first curved plate is set as a reference.

More specifically, in setting the heating direction line for any one point where the degree of curvature is poor based on the heating direction reference line of the first curved board, the heating direction line for any one point And the heating direction reference line of the first curved plate is set to be parallel, or, the angle formed by the heating direction line for the arbitrary one point and the heating direction reference line of the first curved plate is within the allowable angle It is possible to set a heating direction line for one arbitrary point where the degree of the curved surface forming level is poor.

Meanwhile, in the present invention, the acceptable angle may be less than 30 degrees, preferably less than 15 degrees.

If the allowable angle exceeds 30 degrees, since the heating direction line for any one point is not set based on the heating direction reference line of the first curved sheet material, in the present invention, the allowable angle is 30 degrees It is preferable to be less than

In FIG. 10, line L corresponds to the reference line in the heating direction of the first curved plate, and lines A, B, and C correspond to heating direction lines for any one point where the degree of curvature is defective. .

At this time, in the case of line A, a state is shown in which the heating direction line for one arbitrary point and the heating direction reference line of the first curved plate are set to be parallel, and in the case of line B and line C, the arbitrary It shows a state in which the angle formed by the heating direction line for one point of and the reference line in the heating direction of the first curved plate is set to be within the allowable angle.

On the other hand, in the present invention, in setting the heating direction line for one arbitrary point, not only can it be set based on one arbitrary point where the degree of curved surface molding is defective, but also, as shown in the drawing, at least A heating direction line for the arbitrary one point may be set by connecting two or more arbitrary points having a poor degree of curvature with a virtual line.

In addition, in the present invention, in setting the heating direction line for one arbitrary point, among one arbitrary point of the first curved plate material, one arbitrary point having a good level of curvature is set to be avoided. It is desirable to do

More specifically, in the present invention, hot forming is performed according to the heating direction line for one arbitrary point by the steps described later, and the degree of curved forming level on the heating direction line for the arbitrary one point. If is included in any one point of good, hot forming proceeds at any one point having a good degree of curvature, and the degree of curvature of any one point having a good degree of curvature is changed. Therefore, in the present invention, in setting the heating direction line for any one point, avoid any one point having a good degree of curvature among any one point of the first curved plate material. It is preferable to set

By the above method, it is possible to select a heating direction line for one arbitrary point where the degree of curvature is poor.

As described above, in the present invention, in setting the heating direction line for any one point at which the degree of curvature is poor, since the heating direction reference line of the first curved plate is set as a reference, the heating By performing the hot forming along the direction line, the efficiency of the hot forming can be improved.

Continuing to refer to FIG. 2 , the method of hot forming a sheet material according to the present invention includes performing hot forming based on the heating direction line of the first curved sheet material (S190).

Since the step of performing such hot forming corresponds to obvious matters in the art, detailed descriptions thereof will be omitted below, and reference may be made to Korean Registered Patent No. 10-1920610 filed and registered by the present applicant.

Through the above steps, the hot forming method of the sheet material according to the present invention can be performed.

On the other hand, although not shown in the drawing, after the hot forming of the plate material, the following steps may be additionally included.

More specifically, the method of hot forming a plate material according to the present invention includes comparing the curved state of the hot-formed primary curved plate material and the curved state in a design curved surface drawing for hot forming the target plate material.

This is compared in the same way as the step of comparing the curvature value at any one point measured of the first curved plate in step S160 and the curvature value of a point corresponding to the arbitrary one point in the design curved surface drawing. Therefore, a detailed description thereof will be omitted.

Next, in the hot forming method of the plate material according to the present invention, the curved state of the hot-formed first curved plate material and the curved surface state in the design curve drawing for hot forming the target plate material are compared, and the hot-formed first curved plate material is compared. When the curved state of the primary curved plate member and the curved state in the design curved drawing for hot forming the target plate member do not match, setting a maximum strain line of the hot-formed primary curved plate member.

Since this can be set in the same way as the step of setting the maximum deformation line of the first curved plate based on the plurality of coordinate values of the first curved plate in step S130 described above, a detailed description thereof will be omitted below. do.

The method of hot forming a sheet material according to the present invention includes the steps of setting a heating direction reference line of the maximum strain line of the hot-formed primary curved sheet material based on the maximum strain line of the hot-formed primary curved sheet material. includes

Since this can be set in the same way as the step of setting the heating direction reference line of the first curved sheet material based on the maximum strain line of the first curved sheet material in step S140 described above, a detailed description thereof will be omitted below. do.

Next, in the hot forming method of the plate material according to the present invention, the curvature at any one point of the hot-formed first curved plate material based on the plurality of coordinate values of the hot-formed first curved plate material Comprising the step of measuring, and also comparing the curvature value at any one point measured of the hot-formed primary curved plate with the curvature value of a point corresponding to the arbitrary one point in the design surface drawing In addition, by comparing the curvature value at any one point measured of the hot-formed primary curved plate with the curvature value of a point corresponding to the arbitrary one point in the design curve drawing, Including the step of selecting the degree of the level of curvature at any one point, and furthermore, among any one point of the hot-formed primary curved plate material, the degree of the degree of curvature is defective at any one point and selecting a heating direction line for the hot-formed first curved plate material, and performing secondary hot forming based on the heating direction line of the first hot-formed curved sheet material.

Since each of these steps can be performed in the same way as steps S150 to S190, a detailed description thereof will be omitted.

Since the step of performing the secondary hot forming is obvious in the art, a detailed description thereof will be omitted below, and reference may be made to Korean Registered Patent No. 10-1920610 filed and registered by the present applicant.

On the other hand, it is natural to repeat the above-described steps again by comparing the curved state of the secondary hot-formed first curved plate material with the curved state in the design curved surface drawing for hot forming the target plate material.

In the above way, the hot-formed sheet material according to the present invention can be manufactured.

As described above, in the present invention, in performing hot forming, the first curved plate material, which is set based on the maximum deformation line of the first curved plate material, rather than proceeding with hot forming in an arbitrary non-directional direction. By performing the hot forming through the reference line in the heating direction of the hot forming, it is possible to improve the efficiency of the hot forming.

In addition, in the present invention, three random points located in the same direction as the heating direction reference line of the first curved plate material are selected, and the heating direction reference line of the first curved plate material is based on the Z-axis coordinate value Since the selection has been made, in measuring the curvature at any one point of the first curved plate, considering only one coordinate value, that is, the Z-axis coordinate value, any one point of the first curved plate curvature can be measured.

In addition, in the present invention, in setting the heating direction line for any one point at which the degree of curvature is poor, since the heating direction reference line of the first curved plate is set as a reference, the heating direction line By proceeding with hot forming along, it is possible to improve the efficiency of hot forming.

Although the embodiments of the present invention have been described with reference to the above and accompanying drawings, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

Claims (2)

Preparing a target plate;
Pressing the target plate member to form a first curved plate member;
3-dimensionally scanning the first curved plate member to generate a plurality of coordinate values for a predetermined position of the first curved plate member;
Setting a maximum deformation line of the first curved plate member based on a plurality of coordinate values of the first curved plate member;
Setting a heating direction reference line of the first curved plate member based on a maximum deformation line of the first curved plate member; and
Measuring the curvature at any one point of the first curved board based on the plurality of coordinate values of the first curved board,
The step of measuring the curvature at any one point of the first curved plate member based on the plurality of coordinate values of the first curved plate member,
Selecting three random points among the first curved plate materials based on a plurality of coordinate values of the first curved plate material; And measuring an angle of an obtuse angle in an obtuse triangle formed by the arbitrary three points,
Selecting 3 random points among the first curved sheet materials is characterized by selecting 3 random points located in the same direction as the heating direction reference line of the first curved sheet material,
The three arbitrary points constitute three vertices of P1 (x1, y1, z1), P2 (x2, y2, z2), and P3 (x3, y3, z3),
Among the three arbitrary points of P1 (x1, y1, z1), P2 (x2, y2, z2), and P3 (x3, y3, z3), the P2 (x2, y2, z2) is the first order surface Assuming that it is the midpoint located on the reference line in the heating direction of the plate, the length of the line segment from P1 (x1, y1, z1) to P2 (x2, y2, z2) is b, from P2 (x2, y2, z2) Assume that the length of the line segment from P3 (x3, y3, z3) is c, the length of the line segment from P3 (x3, y3, z3) to P1 (x1, y1, z1) is a, and the P2 (x2, y2 , z2) assuming that the interior angle is θ, the interior angle θ at P2 (x2, y2, z2) is a method for measuring curvature of a plate material, characterized in that the following equation (1).
... Equation 1 According to claim 1,
The length b of the line segment from P1 (x1, y1, z1) to P2 (x2, y2, z2) is the Z-axis coordinate of P1 (x1, y1, z1) and P2 (x2, y2, z2) The length of the line segment is measured based on the value, and the length c of the line segment from P2 (x2, y2, z2) to P3 (x3, y3, z3) is the P2 (x2, y2, z2) and The length of the line segment is measured based on the Z-axis coordinate value of P3 (x3, y3, z3), and the length of the line segment from P3 (x3, y3, z3) to P1 (x1, y1, z1) a is a method for measuring the curvature of a plate material, characterized in that for measuring the length of the line segment based on the Z-axis coordinate values of the P3 (x3, y3, z3) and the P1 (x1, y1, z1).