CN111368352A

CN111368352A - Method for constructing parameterized bias skirt prototype based on AutoCAD software

Info

Publication number: CN111368352A
Application number: CN201910825793.3A
Authority: CN
Inventors: 张皋鹏; 华启耀; 陈咪
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-07-03

Abstract

The invention discloses a method for constructing a parameterized bias skirt prototype based on AutoCAD software. By means of the AutoCAD parameterization function, a parameterized bias-cut skirt prototype is constructed, and the personalized bias-cut skirt paper pattern can be quickly and accurately generated by adjusting key parameters such as the bias-cut angle, the number of bias-cut pieces or the waistline, the hip circumference, the skirt length and the like. The parameterized bias-cut skirt prototype built by the method does not need to be put in order, and can generate an individualized bias-cut skirt paper pattern only by adjusting the key size, and the bias-cut angle of the parameterized bias-cut skirt prototype can be adjusted at will between 45 degrees and 90 degrees; the number of the slashes of the parameterized slashed skirt prototype can be adjusted at will. The invention solves the problems of low efficiency, complex manual operation and the like of the traditional oblique-cut dress paper pattern production, greatly improves the generation efficiency of the oblique-cut skirt paper pattern, shortens the production period of the oblique-cut skirt, reduces the production cost of enterprises and has good application value.

Description

Method for constructing parameterized bias skirt prototype based on AutoCAD software

Technical Field

The invention relates to the technical field of garment structures, in particular to a method for constructing a parameterized inclined cut skirt prototype.

Background

The oblique cutting is a cutting method for forming an included angle between the fabric warp direction and the garment droop line, and the skirt made by oblique cutting has elegant and smooth appearance, can naturally wrap the body, shows the body curve beauty, and can leave enough loose amount and space for the body movement.

Most of the manufacturing of the bias-cut paper patterns is manually or singly drawn by CAD software, and the drawn bias-cut paper patterns cannot obtain templates with different specifications and sizes by a coding technology; the angle and the number of the inclined cutting sheets of the inclined cutting paper pattern cannot be changed conveniently and rapidly; these disadvantages bring a lot of repetitive and inefficient labor to the clothing platemakers, limit the repeated utilization of the bias-cut paper patterns to a certain extent, and limit the development of the bias-cut clothing market.

AutoCAD software since 2010 edition has provided parameterization tools that include two types of constraints: geometric constraints and dimensional constraints.

Geometric constraints are used to define relationships between objects of a graphic. The user can ensure an accurate positional relationship between the graphic objects through geometric constraints. The constraint types include: coincident, collinear, parallel, perpendicular, concentric, tangential, etc.

The labeling constraint is used for constraining the distance, the angle, the radius and the diameter, the labeling constraint can lock the object and keep the fixed size of the object, and the size of the constrained object can be changed by modifying parameters and expressions.

Geometric constraints and size constraints are added between the graphic objects by the parameterization tool of the AutoCAD software. By defining parameters and establishing a functional relation, association constraint is generated between the graphic objects, and a parameterized model is constructed.

The user may enforce various designs and modifications using geometric constraints and annotation constraints. And the original graph can be driven to automatically generate a new graph by modifying the parameters and the functional relation.

Disclosure of Invention

The invention aims to provide a plate making method for efficiently and accurately generating a bias-cut skirt prototype, aiming at quickly and accurately generating an individualized bias-cut skirt paper pattern, reducing repetitive labor of a platemaker and reducing the production cost and the production period of an enterprise.

In order to achieve the aim, the invention discloses a method for constructing a parameterized bias skirt prototype based on AutoCAD software, which is characterized by comprising the following steps of: step 1, constructing a digital bias-cut skirt prototype. Taking model 160/68A as an example, a digital straight skirt prototype cut in slant is drawn by using AutoCAD software and stored in DWG format.

And 2, constructing a parameterized tailored skirt prototype. And (3) importing the digital skirt prototype saved in the step (1) into AutoCAD software, carrying out geometric constraint and labeling constraint by using a parameterization tool of the skirt prototype, and generating association constraint between lines of the skirt prototype by defining parameters and establishing a functional relational expression.

And 3, carrying out parametric adjustment on the skirt prototype in the bias cut mode. And related parameters are adjusted through a parameterized panel of the AutoCAD software, so that the generation of the parameter fast-driven template is realized.

Drawings

Fig. 1 shows a frame of a mitre skirt.

Fig. 2 shows a schematic representation of a prototype of a mitre skirt.

Fig. 3 shows a schematic diagram of a parameterized sanction skirt prototype.

Fig. 4 parameterized bias skirt prototype constraint markup.

Fig. 5 parameterizes the slashing skirt prototype geometric constraint map.

FIG. 6 is a comparative graph of the specification sizing.

Fig. 7 is a comparison diagram of the cutting angle adjustment.

Fig. 8 is a virtual fitting effect diagram of the bias cutting angle.

FIG. 9 shows the adjustment of the number of slices in a diagonal direction.

Fig. 10 is a view showing the virtual fitting effect of the number of slantwise cut pieces.

Detailed Description

The invention aims to provide a plate making method for efficiently and accurately generating a bias-cut skirt prototype.

In order to achieve the aim, the invention discloses a method for constructing a parameterized bias skirt prototype based on AutoCAD software.

In order to make the present invention more comprehensible, a preferred embodiment is described below with reference to the accompanying drawings.

Step 1, constructing a digital bias-cut skirt prototype.

Skirt prototypes are generally drawn by taking a straight skirt in plane cutting as a sample, wherein the model 160/68A is taken as an example, and AutoCAD 2020 software is taken as a platform.

Waist length = W =680mm, hip length = H =900mm, skirt length =600mm, number of panels = n =4, and bias cut angle = α =45 °.

First, a straight skirt prototype frame diagram is drawn. The AutoCAD 2020 is turned on, the drawing environment is set up with the skirt length long and H/n =225mm wide, the waist line and skirt length line are drawn with the "rectangle" command, and the rectangle is broken up into four straight lines with the "break up" command.

The hip line was drawn by shifting the waist line vertically downward by a distance 180mm from the hip length with the "shift" command.

The side seam reference line is drawn with the "offset" command to offset the back skirt centerline to the right by H/n-10=215 mm. And finishing drawing the straight skirt prototype frame line.

The structure diagram of the skirt prototype is shown in figure 1, the front skirt piece and the rear skirt piece are respectively provided with two dart paths, the dart paths are respectively 10cm and 11cm in length, the drawing of the skirt prototype frame line is referred, and the structure diagram of the straight cutting prototype skirt is drawn by using related tools.

And (3) continuously drawing the bias-cut skirt paper pattern on the basis of the skirt prototype paper pattern in the figure 1. By the "stretch" command, the horizontal waistline, hip-line and skirt-line are extended to the left.

Respectively selecting the center line of a back skirt piece, the front and back side stitches, the intersection point of the center line of the front skirt piece and the horizontal waist line as a slash datum point, drawing 3 slashes with an angle of α through a 'straight line' command towards the left lower side, extending the slashes to be intersected with the long line of the skirt, drawing the left slash, the center slash and the right slash of a slash skirt prototype, finishing the drawing of the frame line of the slash skirt prototype, and referring to a figure 1.

And (3) acquiring the hip and waist difference value of the straight front skirt piece by using a measuring tool, setting the hip and waist difference value = △ = S1S2, vertically determining a point S4 by taking S3 as a reference point, ensuring S1S2= S3S4, connecting the points S6S2S4S5 in sequence by using a straight line tool, and finishing the drawing of the oblique front skirt piece.

Similarly, the mitre back skirt piece can be drawn to complete the figure shown in fig. 2.

And storing the drawn digital slashing prototype skirt into a DWG format, and naming the file as the slashing prototype skirt.

And 2, constructing a parameterized tailored skirt prototype.

And (4) importing the digital bias cutting prototype skirt drawn in the step (1) and setting a drawing environment.

And (3) simplifying the bias cutting prototype drawn in the step (1) because each piece of the bias cutting skirt has the same size, and only reserving the bias cutting paper pattern of the front skirt piece to construct a parameterized bias cutting paper pattern prototype so as to enable the invention to be clearer and easier to understand.

Fig. 3 shows a schematic diagram of a prototype of a parametric bias cut pattern, where H is hip circumference, W is waist circumference, n is the number of bias cuts, α is bias cut angle, △ is transfer amount, and the value satisfies the relation of △ = (H-W)/n.

When the parameterized bias skirt prototype is constructed, specific values of △ do not need to be solved, and only the geometric relationship among objects needs to be constrained through geometric constraint.

And constraining the bias cutting prototype skirt by a constraint marking function in the parameterization toolbar. As "vertical" in the single click linear constraint, the first is designated S1, the second point is S2, and the dimension line position value is designated 180 mm. The labeling constraint on the line segment S1S2 is completed.

The same holds for other line segments of the mitre skirt prototype, see fig. 4.

The bias-cut prototype skirt is constrained by a geometric constraint function in the parameterization toolbar. The parameterized bias skirt prototype geometric constraint map is shown in fig. 5. And (3) completing the construction of a parameterized slashing skirt prototype, wherein the constraint data of the parameterized slashing skirt prototype are shown in the following table 1.

。

Once the parameterized oblique cutting skirt prototype is constructed, the key size parameters such as the length of the skirt, the hip circumference, the waist circumference and the like can be adjusted, thereby generating oblique cutting skirt paper patterns with different specifications and sizes, and the oblique cutting angle parameter α (between 45 degrees and less) can be adjustedαLess than 90 deg. to adjust the angle of bias cut; can be adjustedAnd (4) adjusting the number of the squints by using the parameter n of the number of the squints.

And 3, carrying out parameterization adjustment on the bias-cut skirt prototype.

Once the parameterized slashing skirt prototype is established, key parameters can be adjusted so as to generate an individualized slashing skirt prototype meeting the requirements.

The parameterized adjustment of the tailor skirt prototype is explained by adopting 3 methods, and the specific scheme is as follows.

Adjustment scheme 1: keeping the angle of the bias cutting and the number of the bias cutting pieces unchanged, and only adjusting the specification and the size of the waistline, the hip circumference, the skirt length and the like, thereby quickly generating the bias cutting skirt templates with different specification and size. The parametric adjustment contrast graph is shown in fig. 6, and the parametric adjustment data is shown in table 2 below.

The adjustment scheme 2 is that the specification size and the number of pieces of the skirt suit are kept unchanged, only the bias cutting angle α is adjusted, the range is controlled to be equal to or less than 45 degrees and less than α degrees and less than 90 degrees, so that the bias cutting skirt paper patterns with different bias cutting angles are quickly generated, the bias cutting angles of 45 degrees, 50 degrees and 55 degrees are taken as examples, a parameterization adjustment contrast diagram is shown in fig. 7, the virtual fitting is carried out by using CLO3D _ Modelist _ x64 software, the height size of the model is 168cm, the waist size is 68cm, the hip size is 90cm, and a virtual fitting effect diagram is shown in fig. 8.

Adjustment scheme 3: keeping the specification size and the angle of the inclined cutting unchanged, and only adjusting the number of the inclined cutting pieces, thereby quickly generating the inclined cutting skirt templates with different numbers of the inclined cutting pieces. The parametric alignment chart is shown in fig. 9, taking 4, 6 and 8 diagonal cuts as an example. The virtual fitting effect is shown in fig. 10.

Claims

1. The invention discloses a method for constructing a parameterized bias-cut skirt prototype based on AutoCAD software, which is characterized by comprising the following steps of: step 1, constructing a digital bias-cut skirt prototype, taking model 160/68A as an example, drawing the digital bias-cut straight skirt prototype by using AutoCAD software, and storing the digital bias-cut straight skirt prototype in a DWG format.

2. The method of claim 1, further comprising the step of 2: and (3) constructing a parameterized slashed skirt prototype, importing the digitalized slashed skirt prototype stored in the step (1) into AutoCAD software, performing geometric constraint and labeling constraint by using a parameterization tool of the slashed skirt prototype, and generating association constraint between lines of the slashed skirt prototype by defining parameters and establishing a functional relational expression.

3. A method of constructing a prototype of a dress skirt according to claims 1 and 2, further comprising: and 3, carrying out parametric adjustment on the skirt prototype in the inclined cutting mode, and adjusting related parameters through a parametric panel of AutoCAD software to realize the generation of the parameter rapid driving template.