CN103942365A - Associated design method of aircraft assembly jig framework - Google Patents

Abstract

The invention discloses an associated design method of an aircraft assembly jig framework. The associated design method mainly comprises the following steps that firstly, an assembly part model is imported; secondly, a tool shafting is defined; thirdly, an assembly part bounding box is established; fourthly, a framework bounding box is established; fifthly, a framework form is judged; sixthly, a guiding face is obtained; seventhly, a section form is selected; eighthly, a guiding line chain is established; ninthly, a framework axis is established; tenthly, a framework structure is established. The associated design method of the aircraft assembly jig framework is applied, the size association between the framework structure and the assembly part three-dimensional model and the structure association of the uniform section form are established, on the basis of the assembly part bounding box, a space grid is submitted to be established and serve as an auxiliary tool for interactive design, so that the automation degree and the design efficiency of the tool framework design are improved, the design quality of an assembly jig is ensured, and the associated design method of the aircraft assembly jig framework is of great importance in the three-dimensional digital parallel design of the tool.

Description

A kind of Association design method of aircraft assembly fixture skeleton

Technical field

The present invention is a kind of Association design method of aircraft assembly fixture skeleton, belongs to aircraft manufacturing design of technological arrangement field.

Background technology

Skeleton, as the basal body structure of assembly jig, plays a part the operation element in fixing and support type frame and keeps its position accuracy and stability.At present, the specialized designing technique research of skeleton mainly concentrates on the aspects such as skeleton structure layout, skeleton structure moulding, skeleton joint processing.Research to skeleton structure moulding, skeleton joint processing is more, and has had ripe function to realize.But, aspect skeleton structure layout, still mainly complete alternately by the most basic function on CAD platform by designer, process is loaded down with trivial details, efficiency is low, and between final design result and aircraft assembly parts model, product data such as assembling attitude etc., do not have a direct correlation, skeleton self-adaptation change with the amendment of product data be can not support, thereby skeleton and the interstructural potential problems such as inharmonious of aircraft assembly parts caused.How to realize structure and size self-adaptation change with the amendment of product structure thereof of assembly jig, thereby the design efficiency and the designing quality of guaranteeing assembly jig that improve assembly jig are to improve one of the intellectuality of frame design and key issue of automaticity.

Summary of the invention

In order to solve the technical matters of above-mentioned existence, the present invention proposes a kind of type frame skeleton Association design method based on the three-dimensional bounding box of assembly parts, the method technology can be used for realizing structure and size self-adaptation change with the amendment of product structure thereof of assembly jig, thereby improves the design efficiency and the designing quality of guaranteeing assembly jig of assembly jig.

The object of the invention is to be achieved through the following technical solutions:

An Association design method for aircraft assembly fixture skeleton, is characterized in that: comprise the steps: 1) importing assembly parts model; 2) definition tooling shaft system; 3) create assembly parts bounding box; 4) create skeleton bounding box; 5) judge skeleton form; 6) obtain guide surface; 7) choose section form; 8) create guiding linear chain; 9) create skeleton axis; 10) create skeleton structure.

The method that described step 3) creates assembly parts bounding box is: create tooling shaft system according to the assembling attitude of assembly parts, and the design space of definition frock, and create therein assembly parts bounding box.

The method that described step 4) creates skeleton bounding box is: create skeleton bounding box according to the locating clip compact space size of mutual appointment.

Described step 5) judges that the method for skeleton structure form is: the version that judges and select skeleton according to the length of assembly parts bounding box (representing with length, width, height respectively).Its process is:

(1) value of length, width, height is by descending sort, and result makes length>width>height;

(2) calculate assembly parts flatness P _awith assembly parts size L _a:

P _a=height/length①

L _a=length②

(3) select skeleton structure form: if L _a<LENGTH or P _a>PLANE), be widget or planar structure, select plane form; Otherwise select three-dimensional form.Wherein: LENGTH and PLANE are respectively critical size and the critical flatness of assembly parts.

The method that described step 6) is obtained guide surface is: the direction of plane skeleton guide surface is consistent with the direction of the minor face of skeleton bounding box, and the direction of three-dimensional framework guide surface is consistent with the longest edge in skeleton bounding box surface level.

The method that described step 8) creates guiding linear chain is: according to the typical section form of choosing, create guiding linear chain on guide surface, by mutual designated ratio relation, thereby realize associated between the similar cross section of different size and bounding box.

The method that described step 9) creates skeleton axis is: for Planar Bone shelf structure form, its direct correlation structure only has a linear chain, by the eccentric throw of given plane skeleton, guiding linear chain is carried out to translation; For cubic cage form, the constructive process of its axis is:

(1) obtain the vector that stretches and interval stretches vectorial vector stretches direction consistent with guide surface direction, initial length is skeleton bounding box and parallel edge lengths.Vector stretches interval stretches vectorial and the pass between progression N is:

<1> is given

$N=[\stackrel{\&RightArrow;}{L_0}/\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}]$ ③

$\stackrel{\&RightArrow;}{L_1}=N\&CenterDot;\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}$ ④

The given N of <2>:

$\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}=\stackrel{\&RightArrow;}{L_0}/(N-1)$ ⑤

$\stackrel{\&RightArrow;}{L_1}=\stackrel{\&RightArrow;}{L_0}$ ⑥

(2) create horizontal linear chain: stretch by interval vectorial guiding linear chain is carried out to translation, can obtain one group of horizontal line linear chain;

(3) create longitudinal linear chain: obtain pilot point, obtain line element by the effect of the vectorial L that stretches, and then create one group of longitudinal linear chain;

(4) create skeleton axis: obtain as above laterally linear chain and longitudinally linear chain, create skeleton axis model.

The method that described step 10) creates skeleton structure is: specify section bar specification, position angle, scan center, generate frame element, automatically carry out joint processing according to different joint categories, obtain skeleton structure model.

Beneficial effect of the present invention: the invention provides a kind of type frame skeleton Association design method based on the three-dimensional bounding box of assembly parts, its beneficial effect is as follows: set up dimension relationship between skeleton structure and assembly parts three-dimensional model and the structure connection of uniform cross section form, on the basis of assembly parts bounding box, propose to create the aid of space lattice as interaction design, thereby automaticity and the design efficiency of frock frame design are improved, and guarantee the designing quality of assembly jig, significant to realizing the three-dimensional digital Parallel Design of frock.

Brief description of the drawings

Fig. 1 is the associated design flow diagram of aircraft assembly fixture skeleton structure.

Fig. 2 (a) is assembly parts.

Fig. 2 (b) is assembly parts bounding box.

Fig. 2 (c) is skeleton bounding box.

Fig. 3 (a) is plane skeleton guide surface.

Fig. 3 (b) is three-dimensional framework guide surface.

Fig. 4 is typical forms.

Fig. 5 is the definition of guiding linear chain.

Fig. 6 (a) is plane skeleton axis.

Fig. 6 (b) is spatial skeleton axis.

Embodiment

Below in conjunction with accompanying drawing, embodiments of the invention are described in detail; the present embodiment is to implement under taking invention technical scheme as prerequisite; provided detailed embodiment and concrete implementation procedure, but protection scope of the present invention is not limited to following embodiment.

Figure 1 shows that the aircraft assembly fixture skeleton Association design method flow process that the present invention proposes, its concrete implementation step is as follows:

Step 1) imports assembly parts model, as shown in Figure 2 (a) shows.

Step 2) definition tooling shaft system.

Step 3), as shown in Fig. 2 (b), creates tooling shaft system according to the assembling attitude of assembly parts, the design space of definition frock, and create therein assembly parts bounding box.

Step 4) as shown in Figure 2 (c), creates skeleton bounding box according to the locating clip compact space size of mutual appointment, and Δ A is locating clip compact space size.

Step 5) judges and selects the version of skeleton according to the length of assembly parts bounding box (representing with length, width, height respectively).Its process is:

(1) value of length, width, height is by descending sort, and result makes length>width>height;

(2) calculate assembly parts flatness P _awith assembly parts size L _a:

P _a=height/length①

L _a=length②

(3) select skeleton structure form: if L _a<LENGTH or P _a>PLANE), be widget or planar structure, select plane form; Otherwise select three-dimensional form.Wherein: LENGTH and PLANE are respectively critical size and the critical flatness of assembly parts.

Step 6) is as shown in Fig. 3 (a), and the direction of plane skeleton guide surface is consistent with the direction of the minor face of skeleton bounding box; As shown in Figure 3 (b), the direction of three-dimensional framework guide surface is consistent with the longest edge in skeleton bounding box surface level, and β represents the direction of guide surface.

Step 8), according to the typical section form as shown in Figure 4 of choosing, creates guiding linear chain on guide surface.As shown in Figure 5, set up following proportionate relationship: α=a ₁/ W, β=a ₂/ W, γ=a ₃/ L, by mutual appointment α, β and γ, thereby realizes associated between the similar cross section of different size and bounding box.

The method that step 9) creates skeleton axis is: for Planar Bone shelf structure form, its direct correlation structure only has a linear chain, by the eccentric throw of given plane skeleton, guiding linear chain is carried out to translation, as shown in Figure 6 (a); For cubic cage form, the constructive process of its axis is:

(1) obtain the vector that stretches and interval stretches vectorial vector stretches direction consistent with guide surface direction, initial length is skeleton bounding box and parallel edge lengths.Vector stretches interval stretches vectorial and the pass between progression N is:

<1> is given

$N=[\stackrel{\&RightArrow;}{L_0}/\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}]$ ③

$\stackrel{\&RightArrow;}{L_1}=N\&CenterDot;\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}$ ④

The given N of <2>:

$\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}=\stackrel{\&RightArrow;}{L_0}/(N-1)$ ⑤

$\stackrel{\&RightArrow;}{L_1}=\stackrel{\&RightArrow;}{L_0}$ ⑥

(2) create horizontal linear chain: stretch by interval vectorial guiding linear chain is carried out to translation, can obtain one group of horizontal line linear chain;

(3) create longitudinal linear chain: obtain pilot point, by the vector that stretches effect obtain line element, and then create one group of longitudinal linear chain;

(4) create skeleton axis: obtain as above laterally linear chain and longitudinally linear chain, create skeleton axis model, as shown in Figure 6 (b).

The method that step 10) creates skeleton structure is: specify section bar specification, position angle, scan center, generate frame element, automatically carry out joint processing according to different joint categories, obtain skeleton structure model.

Claims (1)

1. an Association design method for aircraft assembly fixture skeleton, is characterized in that: comprise the steps: 1) importing assembly parts model; 2) definition tooling shaft system; 3) create assembly parts bounding box; 4) create skeleton bounding box; 5) judge skeleton form; 6) obtain guide surface; 7) choose section form; 8) create guiding linear chain; 9) create skeleton axis; 10) create skeleton structure;

Wherein, the method that described step 3) creates assembly parts bounding box is: create tooling shaft system according to the assembling attitude of assembly parts, and the design space of definition frock, and create therein assembly parts bounding box;

Wherein, the method for described step 4) establishment skeleton bounding box is: create skeleton bounding box according to the locating clip compact space size of mutual appointment;

Wherein, described step 5) judges that the method for skeleton structure form is: the version that judges and select skeleton according to the length of assembly parts bounding box (representing with length, width, height respectively); Its process is:

(1) value of length, width, height is by descending sort, and result makes length>width>height;

(2) calculate assembly parts flatness P _awith assembly parts size L _a:

P _a=height/length①

L _a=length②

(3) select skeleton structure form: if L _a<LENGTH or P _a>PLANE), be widget or planar structure, select plane form; Otherwise select three-dimensional form; Wherein: LENGTH and PLANE are respectively critical size and the critical flatness of assembly parts;

Wherein, the method that described step 6) is obtained guide surface is: the direction of plane skeleton guide surface is consistent with the direction of the minor face of skeleton bounding box, and the direction of three-dimensional framework guide surface is consistent with the longest edge in skeleton bounding box surface level;

Wherein, the method that described step 8) creates guiding linear chain is: according to the typical section form of choosing, create guiding linear chain on guide surface, by mutual designated ratio relation, thereby realize associated between the similar cross section of different size and bounding box;

Wherein, the method that described step 9) creates skeleton axis is: for Planar Bone shelf structure form, its direct correlation structure only has a linear chain, by the eccentric throw of given plane skeleton, guiding linear chain is carried out to translation; For cubic cage form, the constructive process of its axis is:

(1) obtain the vector that stretches and interval stretches vectorial vector stretches direction consistent with guide surface direction, initial length is skeleton bounding box and parallel edge lengths; Vector stretches interval stretches vectorial and the pass between progression N is:

<1> is given

$N=[\stackrel{\&RightArrow;}{L_0}/\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}]$ ③

$\stackrel{\&RightArrow;}{L_1}=N\&CenterDot;\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}$ ④

The given N of <2>:

$\stackrel{\&RightArrow;}{\mathrm{\&Delta;L}}=\stackrel{\&RightArrow;}{L_0}/(N-1)$ ⑤

$\stackrel{\&RightArrow;}{L_1}=\stackrel{\&RightArrow;}{L_0}$ ⑥

(2) create horizontal linear chain: stretch by interval vectorial guiding linear chain is carried out to translation, can obtain one group of horizontal line linear chain;

(3) create longitudinal linear chain: obtain pilot point, by the vector that stretches effect obtain line element, and then create one group of longitudinal linear chain;

(4) create skeleton axis: obtain as above laterally linear chain and longitudinally linear chain, create skeleton axis model;

Wherein, the method that described step 10) creates skeleton structure is: specify section bar specification, position angle, scan center, generate frame element, automatically carry out joint processing according to different joint categories, obtain skeleton structure model.