JP2002373533A - 3-dimensional virtual assembling method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a design period. SOLUTION: A curve of wire harness or the like is divided into pieces of wires, and they are processed by polygon processing and displayed. Further, they are compared with a 3-dimensional form of the wire harness as the standard wiring data, which is displayed as a background picture. Compared with the case, where a trial product is made, processing efficiency increases sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a three-dimensional design in which a control means displays three-dimensional design data of a wire harness in a virtual three-dimensional space displayed on a display means, based on data input by data input means. The present invention relates to a virtual assembly system and related technologies.

[0002]

2. Description of the Related Art Generally, wire harnesses are used as electric wiring in automobiles and electric appliances. In manufacturing the wiring harness, first, for a wiring object such as an automobile or an electric appliance, a three-dimensional wiring design of the wiring harness was performed based on the mounting positions of various components in the wiring object. Then, based on the three-dimensional wiring design result, the drafting of the wire harness is designed on the two-dimensional design paper. Then, according to the design of the wire harness drawn in the drawing, a plurality of support jigs 2 are mounted on the drawing board 1 as shown in FIG. 14, and a plurality of electric wires are supported by the support jig 2 while being bundled. The wire harness 3 is produced by, for example, winding with resin tape.

[0003] The wire harness 3 thus created
Conventionally, when performing a completeness evaluation for a design in its production drawing, the target product and the wiring harness
There is a method in which a dimensional drawing is created and output by a design support system such as CAD, and the designer checks the drawing to extract problems.

In addition, a prototype of the wire harness 3 is manufactured, and the prototype is actually routed to a wiring object 4 such as an automobile or an electric appliance as shown in FIG. There is also a method of examining whether or not the design of the wire harness is appropriate by examining the suitability for the wiring object 4.

Reference numeral 5 in FIGS. 14 and 15 indicates a connector for connecting to various components.

[0006]

In a method in which a designer evaluates a problem by looking at a drawing, there is a problem that evaluation criteria differ depending on the skill level of the designer, and it is difficult to create a uniform evaluation standard.

On the other hand, a prototype 3 is actually produced,
The method of wiring the prototype 3 to the wiring object 4 is advantageous in that a three-dimensional problem can be extracted satisfactorily.

[0008] However, in general, the assembling (assembly) process of the wire harness mostly depends on manual work, and therefore, the work of producing a prototype requires human resource intensive work. It becomes necessary and the time spent is enormous.

[0009] If any problem such as insufficient dimension or excessive load on the mounting angle occurs when the prototype is attached to the wiring object, the design of the wire harness and the production of the prototype are required. You have to start over and over again. Therefore, it takes an enormous amount of labor and time to examine the suitability of the wiring of the wire harness designed for drafting in the past (wiring examination), and as a result, the development period until the design is completed is prolonged. There was a problem.

Accordingly, an object of the present invention is to provide a three-dimensional virtual assembly which can perform efficient wiring examination work by virtually examining the wiring when designing a wire harness. It is an object of the present invention to provide a system and related technologies.

[0011]

Means for Solving the Problems In order to solve the above problems,
According to the first aspect of the present invention, based on the data input by the data input means, the control means displays the three-dimensional design data of the wire harness in a virtual three-dimensional space displayed on the display means. A method of inputting a shape of the wire harness as reference routing data in which a wire harness is routed three-dimensionally to a predetermined wiring object by a predetermined data input means, and designing the wire harness for manufacturing. A data input step of inputting three-dimensional design data in which the wire harness is routed three-dimensionally by the data input means;
A reference plan data image display step of displaying a three-dimensional design data as a background image in a three-dimensional space, a three-dimensional design data display step of displaying the three-dimensional design data superimposed on the background image, A three-dimensional design data deforming step of changing and displaying the shape of the wire harness as three-dimensional design data.

According to a second aspect of the present invention, there is provided the three-dimensional virtual assembling method according to the first aspect, wherein the three-dimensional design data is arranged along a main plane of a drawing board used in manufacturing a wire harness. For two-dimensional data expressed two-dimensionally,
It is generated by adding coordinates in the normal direction of the main plane.

According to a third aspect of the present invention, there is provided the three-dimensional virtual assembly method according to the first or second aspect, wherein
The dimensional design data is divided into a plurality of line pieces.

According to a fourth aspect of the present invention, in the three-dimensional virtual assembling method according to the third aspect, when the shape of the wire harness is changed, the center lines of adjacent line pieces are continuously connected. And the vector information for each of the line pieces is changed.

According to a fifth aspect of the present invention, there is provided the three-dimensional virtual assembling method according to the third or fourth aspect, wherein a phase difference (twist angle) in a direction between adjacent line pieces is determined. Data is provided for each line segment.

According to a sixth aspect of the present invention, in the three-dimensional virtual assembling method according to any one of the first to fifth aspects, the outer periphery of the wire harness is changed before changing the shape of the wire harness. A virtual surface straight line parallel to the central axis is drawn, and the surface straight line is twisted according to the twist angle of the wire harness and displayed on the display means.

According to a seventh aspect of the present invention, in the three-dimensional virtual assembly system according to any one of the third to fifth aspects, when a part of the wire harness is covered by an exterior part, Instead of the three-dimensional design data of the line piece, the three-dimensional design data of the exterior part is used for each line piece.

According to an eighth aspect of the present invention, there is provided a program for causing a computer to execute each of the steps in order to implement the three-dimensional virtual assembly method according to any one of the first to seventh aspects on the computer. It is.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A three-dimensional virtual assembly system according to one embodiment of the present invention creates a designed wire harness shape with three-dimensional digital data (hereinafter referred to as "three-dimensional design data"). At the same time, a three-dimensional digital data (hereinafter referred to as “reference routing data”) of the wiring harness routing route of the product (wiring target) on which the wiring harness is installed is displayed as an image, and the reference routing displayed on the image is displayed. By performing virtual matching by performing positioning and deformation such as bending of the three-dimensional design data so that the three-dimensional design data is superimposed on the data, a mismatch point (a mismatch point) of the designed wire harness is performed. Content) can be detected.

<Overall Configuration of Three-Dimensional Virtual Assembly System> FIG. 1 is a diagram showing a three-dimensional virtual assembly system according to one embodiment of the present invention. The three-dimensional virtual assembly system includes a display device (display means) 11 such as a CRT display and a keyboard 1 as hardware resources, as shown in FIG.
2 and an input device 14 such as a mouse 13, a storage device 15 such as a hard disk drive, and a computer main body (control means) 16 including a CPU and a main memory. The storage device 15 stores a software program that defines a processing procedure when the CPU of the computer main body 16 performs arithmetic processing using various data in the storage device 15 based on an input operation from the input device 14. I have.

Although not shown, the data input means for inputting data includes, in addition to the input device 14, a medium reading device for reading a recording medium such as a magnetic disk, a LAN (local area network), or the like. And a communication device that receives data by communication via the communication path of.

By using these hardware resources 11 to 16 in combination, each step of the three-dimensional virtual assembly method shown in the flowchart of FIG. 2 is sequentially realized. Each of these steps is governed by a software program stored in the storage device 15 in advance.

<Three-dimensional virtual assembly method>
The reference plan data is input to the computer main body 16.

The reference arrangement data referred to here is three-dimensional wiring data (three-dimensional electronic data) of a wire harness in a three-dimensional space in which a wiring object is modeled. For example, for a wiring object such as an automobile or an electric appliance, a three-dimensional wiring design of a wire harness is performed in advance based on mounting positions of various parts in the wiring object, and the three-dimensional wiring at that time is determined. The coordinate information of the shape of the wire harness in the space, the coordinate information of various parts attached to the wire harness, and the like are converted into three-dimensional drawings using a design support software program such as CAD.
It is created as three-dimensional electronic data, and the three-dimensional electronic data is input to the computer main body 16 and stored in the storage device 15 (see FIG. 1). As the CAD software program used here, the same device as that in the computer main body 16 may be used. In this case, the input device 14 is used as input data relating to the shape of the wire harness 3.
Although it may be manually input by using a computer, three-dimensional electronic data created by another CAD system is transmitted to the computer main body 1 through communication or a predetermined recording medium such as a magnetic disk.
6 may be transferred.

[Step S1] Three-dimensional design data input step The three-dimensional design data referred to here is two-dimensional electronic data (two-dimensional electronic data) when manufacturing on a two-dimensional planar drawing board 1. This refers to electronic data displayed in three-dimensional coordinates.

First, in step S1 in FIG. 2, based on the above three-dimensional drawing, each size such as the length dimension from branch to branch of the wire harness 3 and the position of connector attachment is designed. A two-dimensional drawing (drafting) of the wire harness 3 in consideration of manufacturing the wire harness 3 on the drawing board 1 as shown in FIG. 14 is created as two-dimensional electronic data using a design support software program such as CAD. The two-dimensional electronic data is input to the computer body 16 in advance.

Next, in the computer main body 16,
A normal coordinate axis (z axis) is added to the coordinate plane (xy plane) of the input two-dimensional electronic data, and the two-dimensional electronic data is stored in the storage device 15 as three-dimensional design data. . As a method for inputting the two-dimensional electronic data to the computer main body 16, the input may be manually performed using the input device 14, but the three-dimensional electronic data created by another CAD system may be transmitted to a communication or magnetic disk. Alternatively, the data may be transferred to the computer main body 16 through a predetermined recording medium such as.

Here, the information input as the two-dimensional data includes, as shown in FIG. 3, two nodes n01 to n20 for specifying the shape of each wire constituting the wire harness 3 on the drawing board 1. Dimensional coordinate information, each node n01 to n
Link information of wires indicating that the wires 20 are connected to each other, diameters r01 to r of wires connected between nodes n01 to n20
14 and others.

Further, in a later-described three-dimensional design data deformation step, in order to enable a realistic deformation of each wire of the wire harness 3, the length of the wire 21 having a center line 21a as shown in FIG. 5, each wire piece 22 is divided into a plurality of wire pieces 22 having a short length a as shown in FIG. The length a of 22 is input. The length a is desirably about 10 mm. The length of each line piece 22 may be equal or separately set as different values. The electric wire 21 having the length L is finely divided by the plurality of wire pieces 22.

Further, weighting data of each of the plurality of electric wires constituting the wire harness 3 is input (described later). The weighting data is a parameter that indicates the difficulty of deformation of each wire in a three-dimensional design data deformation process described later, and the larger the value of the weighting data, the more difficult it is to move during deformation, and As for the bending deformation of the wire, the larger the value of the weighting data, the more the wire is bent over the entire wire instead of only the deformation point. Such weighting data is data empirically obtained according to various factors such as the diameter of each electric wire.

[Step S2] Step of Displaying Reference Policy Data Image In the following step S2, the reference policy data input in advance is plotted in a virtual three-dimensional space and displayed three-dimensionally on the display device 11. In this virtual three-dimensional space, it is possible to perform a virtual viewpoint change in the virtual three-dimensional space based on an operation on the input device 14 such as the mouse 13, for example.

The reference plan data is used as a background image when displaying the three-dimensional design data as described later, and is used to identify the three-dimensional design data. The specified three-dimensional figure display of the virtual wire harness 3 is displayed in achromatic color, for example.

[Step S3] Three-dimensional design data display step Next, in step S3, the three-dimensional design data input in step S1 is stored in the three-dimensional space of the reference plan data already displayed in step S2. Display them in layers.

Here, in the shape expression using general three-dimensional design data, for example, when expressing each electric wire 21 or each wire piece 22 of an aggregate of a plurality of electric wires (wire bundle), FIG.
6 to be expressed using a columnar shape.

Specifically, as shown in FIG. 6, a vector S having a length in a direction passing through the center of the cylinder is defined for the data of the line piece 22 having the length a. The vector S is x
From the reference point based on the torsion angle (rotation angle about the line axis) θ between the direction information and the length information in the three-dimensional space composed of the axis, the y-axis, and the z-axis, and another continuous line piece. By specifying the rotation angle information, only the absolute position and the degree of twist can be specified and set.

Then, each independent line segment 22 data is
It is displayed as being continuously connected to each other (continuous connection). Here, as a method of continuous connection, as shown in FIG.
When connecting the line piece 22a and the line piece 22b, the coordinates of the end points of the center axes 23a and 23b are made to coincide with each other.

Then, the entire three-dimensional design data is moved in the virtual three-dimensional space using the input device 14 such as the mouse 13, and the overall positional relationship between the three-dimensional design data and the reference plan data is adjusted. Then, when the three-dimensional design data is adjusted (positioned) to a position that the operator considers desirable, step S3 is ended.

[Step S4] Three-Dimensional Design Data Deformation Step In step S4, using the input device 14 such as the mouse 13, the shape of the electric wire 21 based on the three-dimensional design data is displayed in a reference layout displayed as a background image. The operator manually deforms the image using the input device 14 so as to match the plan data image.

Although it is not impossible to express and process the flexibility of the line piece 22 by data using the function of a normal three-dimensional simulation system, the operation is extremely complicated, and the result of the operation is It is not always the operator's intention.

Therefore, in this three-dimensional virtual assembly system, the following processing is performed in order to enable flexible characteristic expression as desired by the operator.

As described above, the recognition of each line piece 22 in the computer main body 16 is based on the vector S in the three-dimensional space.
This is performed using a vector variable (x, y, z, θ). Note that the variable θ is, as shown in FIG.
It means the twist angle generated between b. In FIG. 8, for simplicity, the z-axis is omitted and is shown on the x, y plane, but it goes without saying that the same applies to three-dimensional coordinates with the z-axis added.

For example, in FIG. 8, it is assumed that the vector S of the five line pieces 22 has the following values.

Vector S1 = (X1, Y1, Z, θ) Vector S2 = (X2, Y2, Z, θ) Vector S3 = (X3, Y2, Z, θ) Vector S4 = (X4, Y1, Z, θ) Vector S5 = (X5, 0, Z, θ) Vector setting is performed in this manner, and the state where the end point of each line piece 22 is specified by the input device 14 such as the mouse 13 is referred to as dragging the mouse 13. By a special operation, the end point of the line piece 22 is moved in the three-dimensional space.

Also in this case, at the connection point 24 between the line pieces 22a and 22b, for example, as shown in FIG. 7, since the pair of line pieces 22a and 22b on both sides are kept continuous, the end point of each line piece 22 is maintained. Is performed, the result of the continuous connection expresses the curvature of the wire harness 3. That is, the line segments 22 that are continuous with each other move so that when one is tensioned, the other is dragged, and the movement vector of the other line segment at that time is one line segment. Is set by a predetermined arithmetic expression based on an empirical rule so as to depend on a variation vector of a continuous connection point with the above. With this processing, the wire harness 3 can be deformed without losing information on the continuity of all electric wires.

However, for example, when the position of the point (X5, 0) in FIG. 8 is moved and changed by the input device 14 such as the mouse 13, the degree of the influence on other connection points is different. . That is, the amount of movement with respect to another connection point close to the point moved by the input device 14 such as the mouse 13 is larger than the amount of movement with respect to another connection point that is farther. Here, it is assumed that the value after the position change of each connection point is as follows.

Vector S1 = (X1, Y1, Z, θ1) Vector S2 = (X2, Y2, Z, θ2) Vector S3 = (X3, Y2, Z, θ3) Vector S4 = (X4, Y1, Z, θ4) ) Vector S5 = (X5, 0, Z, θ5) In this case, θ1 <θ2 <θ3 <θ4 <θ5. This allows the curved shape of the wire harness 3 to be expressed both in terms of absolute coordinates and relative degrees of twist, and also allows other flexible expressions, such as flexure, to be made freely. Note that the relational expressions from θ1 to θ5 are set in advance based on empirical rules and the like, and are defined in advance as software programs that govern the operation of the three-dimensional virtual assembly system.

In the wire harness 3, regarding the influence between different electric wires, a weighting parameter which means that each electric wire is hardly deformed is considered. That is, using a predetermined arithmetic expression, the larger the value of the weighted data, the smaller the amount of movement in the deformation, the larger the value of the weighting data, and also the larger the value of the weighted data, the larger the value of the weighted data for the bending deformation of the wire.
Instead of deforming only at the deformation point, the wire is gently bent over the entire wire.

By the way, the wire harness 3 is not only an assembly of electric wires, but also various exterior parts (for example, vinyl tubes, corrugated tubes, various tape windings, etc.) 26
Are often attached around the electric wire 21. Therefore, these exterior parts 26 also need to be expressed in shape in conjunction with the shape data of the electric wire 21.

Therefore, for example, the data structure similar to that of the electric wire 21 for each of the exterior components 26, that is, the information on the length dimension and the diameter is also created for the exterior components 26, and the exterior components 26 are The data of the line piece 22 in the attachment range is deleted, and the data of the exterior component 26 is inserted therein.
According to such a method, the diameter, design, dimensional shape, and the like of the exterior component 26 can be arbitrarily created by a process independent of the electric wire 21, and a three-dimensional wire harness shape equivalent to the actual product can be expressed.

By the way, in this embodiment, as described above, the parameter of the relative twist angle φ (corresponding to the above θ) around the center axis of each line piece is provided. Is displayed on the display device 11 even if
If the state of the twist cannot be recognized when looking at the dimensional shape, it becomes difficult for the operator to handle. That is, in order to effectively perform the actual three-dimensional simulation, it is desirable to visually represent the “twist characteristic” on the display device 11. Therefore, in the initial stage of creating the data of the line piece 22, a straight line is added in the length direction of the outer peripheral surface of the line piece 22. In this case, a description will be given of a three-dimensional model of the electric wire 21 in FIG. The twist angle φ, which is a parameter of the vector S, is
It shall be set to any fixed value.

First, the shape of each line piece 22 is displayed as a columnar shape. Apart from the center axis of each line piece 22, a straight line (hereinafter, referred to as a line) is formed on the outer peripheral surface of each columnar line piece 22 along the length direction. "Surface straight line") is added. Initially,
In each electric wire 21, the surface straight lines of all the wire pieces 22 are set in a straight line.

Here, when the twist angles φ of all the line pieces 22 data are the same in the continuously connected line pieces 22, the straight line in the length direction of the outer peripheral surface of all the cylinders is a continuous straight line. It is an expression that can realize a visual expression without "twisting".

On the other hand, when the twist angle φ is changed in some line pieces 22, the surface straight line drawn on the outer periphery of each line piece 22 is displayed as twisted as shown in FIG. 11 according to the degree of the change. Is done. That is, when a certain line piece 22 is twisted due to, for example, movement of a branch line, the adjacent line piece is displayed as if twisting occurred with the twist angle φ reduced by a predetermined rule. By simply drawing a surface straight line on the outer periphery of the columnar line piece 22 as described above, the “twist characteristic” can be visually expressed.

[Step S5] The results of the transformation of the three-dimensional design data of the electric wires 21 are displayed on the display device 11 so as to be superimposed on the image of the reference arrangement data displayed as the background image, and the degree of coincidence / inconsistency thereof is To see

For example, as shown in FIG. 12, when the slack of the image 29 of the three-dimensional design data is much larger than the image 28 of the reference policy data as the background image, the design dimension of the electric wire is excessively large. It means that it is long.

As shown in FIG. 13, the branch line 29a in the three-dimensional design data is drawn out in the opposite direction to the trunk lines 28 and 29 with respect to the branch line 28a in the reference plan data as the background image. If so, a design change is made to change the forming direction of the branch line 29a with respect to the trunk wire 29.

In addition, when the electric wire is excessively short,
In the case where the twist is excessively generated, the user can easily visually recognize the twist based on the display result on the display device 11.

According to the above-described three-dimensional virtual assembly method, when designing a wire harness, it is possible to virtually investigate wiring with respect to the design result without actually producing a prototype, thereby improving efficiency. Good wiring work can be done.

Therefore, the labor and time involved in the design can be greatly reduced as compared with the related art, and the development period up to the completion of the design can be drastically shortened.

Further, not only the coordinate information but also the examination of the twist of each electric wire 21 can be performed together, which is useful for practical design examination.

[0061]

According to the first, second, and eighth aspects of the present invention, when designing a wire harness, a virtual product can be virtually created without actually producing a prototype. By efficiently conducting the wiring examination, efficient wiring examination work can be performed.

Therefore, as compared with the related art, the labor and time involved in the design can be greatly reduced, and the development period until the completion of the design can be drastically shortened.

According to the third and eighth aspects of the present invention, since the curve and the like of the wire harness can be divided into line pieces and processed and displayed on a polygon, it is assumed that the wire harness is actually curved as physical data. The calculation load on the control means can be reduced as compared with the case of performing calculation processing.

According to the fourth and eighth aspects of the present invention, when the wire harness is divided into a plurality of wire pieces,
The continuous state of the line pieces can be maintained before and after the deformation.
Therefore, it is possible to perform a wire harness deformation process similar to the actual wire harness bending operation.

According to the fifth and eighth aspects of the present invention, since data on the phase difference (twist angle) in the direction between adjacent line pieces is given to each line piece, the change in the phase difference Is displayed on the display means, it is possible to easily visually recognize whether or not there is an excessive twist.

According to the present invention, before changing the shape of the wire harness, a straight surface straight line parallel to the central axis is virtually drawn on the outer periphery of the wire harness. Every. Since the surface straight line is twisted and displayed on the display means according to the twist angle of the wire harness, the twist of the wire harness can be examined together, which is useful for practical design study.

According to the seventh aspect of the present invention, when a part of the wire harness is covered with the exterior part, the three-piece
Since the three-dimensional design data of the exterior component is substituted for each line piece instead of the three-dimensional design data, there is an effect that a three-dimensional wire harness shape equivalent to the actual thing can be expressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a hardware configuration of a three-dimensional virtual assembly system according to one embodiment of the present invention.

FIG. 2 is a flowchart showing a three-dimensional virtual assembly method according to one embodiment of the present invention.

FIG. 3 is a diagram showing an image of two-dimensional data.

FIG. 4 is a diagram showing a model of an electric wire in a three-dimensional space.

FIG. 5 is a diagram showing a state where an electric wire is divided into a plurality of wire pieces.

FIG. 6 is a diagram showing vector information of a line segment.

FIG. 7 is a diagram showing a state in which wire pieces are continuously connected.

FIG. 8 is a diagram showing a state in which the electric wire is curved and changed.

FIG. 9 is a diagram showing a state in which an exterior component is applied instead of a wire piece.

FIG. 10 is a diagram illustrating a state in which a surface straight line is drawn on the outer periphery of each line piece.

FIG. 11 is a diagram showing a state in which the electric wire is twisted in a state where a surface straight line is drawn on the outer periphery of each wire piece.

FIG. 12 is a diagram in a case where it is determined that the length is excessively long.

FIG. 13 is a diagram when a branch line is found to be in the opposite direction.

FIG. 14 is a diagram showing an operation of producing a wire harness on a drawing board.

FIG. 15 is a view virtually illustrating a state in which a wire harness is routed three-dimensionally on a wiring target.

[Explanation of symbols]

 Reference Signs List 11 display device 14 input device 15 storage device 16 computer body

Continued on the front page (72) Inventor Tsutomu Nakamura 1-114, Nishisuehiro-cho, Yokkaichi-shi, Mie F-term (reference) in Sumitomo Wiring Systems Co., Ltd. 5B046 AA04 AA07 FA04 FA12 FA16 5E501 AC09 AC15 BA03 FA14 FA27 FA44 FB22 FB24 FB45 5G311 CA05 CF06

Claims (8)

[Claims] 1. A three-dimensional virtual assembling method in which a control means displays three-dimensional design data of a wire harness in a virtual three-dimensional space displayed on a display means based on data input by the data input means. While inputting the shape of the wire harness as reference routing data in which the wire harness is routed three-dimensionally to a predetermined wiring object by predetermined data input means, the wire harness designed for manufacturing is A data input step of inputting three-dimensionally arranged three-dimensional design data by the data input means; and a reference policy data image displaying step of displaying an image of the reference policy data as a background image in a virtual three-dimensional space. A three-dimensional design data displaying step of displaying the three-dimensional design data superimposed on the background image; 3D virtual assembling method and a three-dimensional design data deforming step said as 3D design data by changing the shape of the wire harness is displayed. 2. The three-dimensional virtual assembling method according to claim 1, wherein the three-dimensional design data is represented two-dimensionally along a main plane of a drawing plate used in manufacturing a wire harness. 2
A three-dimensional virtual assembling method, wherein the three-dimensional virtual assembly method is generated by adding coordinates of a normal direction of the main plane to dimensional data. 3. The three-dimensional virtual assembly method according to claim 1, wherein the three-dimensional design data is divided into a plurality of line pieces, and at least vector information indicating coordinates of each line piece is set. Three-dimensional virtual assembly method. 4. The three-dimensional virtual assembling method according to claim 3, wherein when changing the shape of the wire harness, the center lines of adjacent line pieces are assumed to be continuous. A three-dimensional virtual assembly method characterized by changing vector information for each piece. 5. The three-dimensional virtual assembling method according to claim 3, wherein data on a phase difference in a direction between adjacent line pieces is given to each line piece. Characteristic three-dimensional virtual assembly method. 6. The three-dimensional virtual assembling method according to claim 1, wherein a straight line parallel to a central axis is formed on an outer periphery of the wire harness before changing a shape of the wire harness. A three-dimensional virtual assembling method, wherein the surface straight line is virtually drawn, and the surface straight line is twisted according to the twist angle of the wire harness and displayed on the display means. 7. The three-dimensional virtual assembling method according to claim 3, wherein, when a part of the wire harness is covered with an exterior part, the three-dimensional design data of the line piece. A three-dimensional virtual assembling method, wherein the three-dimensional design data of the exterior component is substituted for each of the line pieces. 8. A program for causing a computer to execute each of the steps in order to implement the three-dimensional virtual assembly method according to claim 1 on the computer.