CN104732036A - Method for fast marking oblique angle value of flanging part - Google Patents

Abstract

The invention provides a method for fast marking the oblique angle value of a flanging part. According to a part design model, the type of the oblique angle value is judged, the vector of the oblique angle value is calculated, the 0-degree oblique angle value is marked, and the oblique angle value is screened according to needs and marked. According to the method, secondary development can be carried out on UG, PROE, CATIA and other various kinds of CAD software, and the type of the oblique angle value is judged. According to the size of the part, the proper equal diversion point number is selected. The 0-degree oblique angle value is checked and marked. The screening method is optimized, and a screening result meets project application needs. According to the method, the reliability and high efficiency of oblique angle value marking can be greatly improved, and meanwhile the design period of a subsequent relevant mould line template is greatly shortened.

Description

A kind of crimp part bevel angle value Fast Labeling

Technical field

The present invention relates to aircraft sample plate design field, be specifically related to a kind of Fast Labeling of crimp part bevel angle value.

Technical background

Aircaft configuration exist the crimp parts such as a large amount of section bar, architrave, due to the restriction that domestic air mail industry manufacture view digital control processing and processing technology are accustomed to, the employing sample plate of long period will control its physical dimension, ensure the mutual coordination of technological equipment and part.

According to " aeronautical manufacture engineering handbook " aircraft sample plate fascicle, in the sample plate design of crimp part, there is following regulation to bevel angle value:

1. bevel angle value is divided into secant oblique angle and tangent line oblique angle, and bevel angle value precision is 10'.

2. when the distance between part crimp termination to tangent line is greater than 0.5mm, use secant oblique angle, otherwise use tangent line oblique angle.

3. when the crimp profile of part is bending disturb angle value be greater than 0.5mm time; Part crimp shape can not use bevel angle value to represent.

4. bevel angle value definition in, with the open bevel of part be on the occasion of, closing oblique angle is negative value.When bevel angle value has positive and negative change, 0 ° of bevel angle value position should be outpoured.

In traditional sample plate design, designer first will determine oblique angle type, then chooses tangent plane on part, measure angle, if bevel angle value has positive and negative change, also need repeatedly to choose tangent plane at constant interval and measure angle until find 0 ° of position, finally screen by certain angle gap (being generally 0.5 ° or 1 °), wherein, the conveniently use of model, except 0 ° of bevel angle value, part two ends bevel angle value also must retain, this makes whole process very loaded down with trivial details, inefficiency.There are some at present based on the solution of secondary development, but these schemes are generally first cook tangent plane by fixing Along ent to measure, if the angular clearances that the angle value in screening process between tangent plane is greater than regulation increases Along ent more betwixt, this scheme process overlength part and bevel angle value non-monotonic change time, there is obvious limitation; And the judgement of bevel angle value type in these schemes, could not be realized, the angle of measurement is secant oblique angle; Do not use Vector operation based on length computation bevel angle value, the positive and negative of bevel angle value cannot be judged; And 0 ° of oblique angle could not be marked in scheme, cause follow-uply still there is larger workload.

Summary of the invention

In order to avoid the deficiencies in the prior art part, the invention provides a kind of crimp part bevel angle value Fast Labeling, designing a model according to part, realize bevel angle value type and judge, bevel angle value Vector operation, marks 0 ° of bevel angle value, screens bevel angle value as required and marks.This method can utilize carries out secondary development realization to all kinds of CAD software such as UG, PROE, CATIA, and its technical scheme is as follows:

Step 1: judge bevel angle value type

Extract the profile intersection of part, profile intersection is got a point at random, cross the normal plane that this point does profile intersection

By normal plane and crimp surface intersection, obtain crimp trim line, measure crimp trim line degree of disturbing, if be greater than 0.5mm, then bevel angle value can not be used to represent, if be less than 0.5mm, then the starting point crossing crimp trim line does crimp trim line tangent line

Measure the distance of part crimp end points to crimp trim line tangent line, if be greater than 0.5mm, use secant oblique angle, if be less than 0.5mm, use tangent line oblique angle;

Step 2: bevel angle value Vector operation

Measure profile intersection length L _outward, calculate Along ent quantity N=[L _outward/ 5]-1

Profile intersection is made Along ent P _i, the length of each Along ent on profile intersection is L _i

Cross each Along ent P _ibe the normal plane PL on profile intersection respectively _i, normal plane PL _icrossingly with bottom edge line obtain an A _iif use secant oblique angle in step 1, then normal plane PL _icrossingly with crimp edge line obtain a B _iif use tangent line oblique angle in step 1, then normal plane PL _icrimp trim line L is obtained with crimp surface intersection _{curved i}, cross crimp trim line L _{curved i}starting point be crimp trim line tangent line L _{cut i}, get crimp trim line tangent line L _{cut i}terminal for some a B _i, measurement point A respectively _i, B _i, P _ithe volume coordinate at place, calculates P _ithe bevel angle value θ at place _ifor:

Step 3: mark 0 ° of bevel angle value

To all θ _icarry out adjacent comparison, if there is θ _i>0 °, and θ _i+1<0 °, then at interval [L _i, L _i+1] there is 0 ° of bevel angle value point P ₀, carry out iterative, order

θ _i＝f(L _i)

0°＝f(L ₀)

L ₀≈L

Suppose θ _i=f (L _i) at interval [L _i, L _i+1]be linear change, then have,

$L=g(L_i,L_{i+1})=L_i+(L_{i+1}-L_i)\&times;\frac{f\left(L_i\right)}{f\left(L_i\right)-f\left(L_{i+1}\right)}$

If f (L) < 0 °, by L=g (L _i, L) and iteration, if f (L) > 0 °, by L=g (L, L _i+1) iteration

If arrange accuracy value §=0.00001

|θ _i|≤§

Then L ₀=L

Calculate complete, contrary, when there is θ _i<0 °, and θ _i+1during >0 °, if f (L) < 0 °, by L=g (L, L _i+1) iteration, if f (L) > 0 °, by L=g (L _i, L) and iteration, all the other steps are the same

Cross some P ₀do the vertical line of profile intersection, and mark bevel angle value 0 ° on part feature tree;

Step 4: screening bevel angle value also marks

If there is 0 ° of bevel angle value point P in step 3 ₀, first, calculation level P ₀and the bevel angle value changing value between neighbouring point | P ₀-θ _i|, if | P ₀-θ _i| be less than the angular clearances of input, then delete θ _iand the P of correspondence _i, secondly, calculation level P _nand the bevel angle value changing value between neighbouring point | P _n-θ _i|, if | P _n-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, finally, calculate all remaining θ _iadjacent bevel angle value changing value | θ _i+1-θ _i|, if | θ _i+1-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i; If there is not 0 ° of bevel angle value point P in step 3 ₀, first, calculation level P _nand the bevel angle value changing value between neighbouring point | P _n-θ _i|, if | P _n-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, finally, calculate all remaining θ _iadjacent bevel angle value changing value | θ _i+1-θ _i|, if | θ _i+1-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i

Cross the rear remaining some P of screening respectively _ido the vertical line of profile intersection, and with the bevel angle value θ that " degree divides ", form (precision is 10') mark was corresponding on part feature tree _i.

Put forward the methods of the present invention contrasts existing technical scheme tool and has the following advantages: achieve the judgement to bevel angle value type; According to the size of part, select suitable Along ent quantity; Search and mark 0 ° of bevel angle value; Optimize screening technique, the selection result meets engineer applied demand.This method will improve reliability and the high efficiency of bevel angle value mark greatly, it also greatly reduce the design cycle of follow-up relevant sample plate simultaneously.

Accompanying drawing explanation

Fig. 1 is aircraft crimp section bar example

Fig. 2 is bevel angle value calculation flow chart

Fig. 3 is the element inputted in example

Fig. 4 judges bevel angle value type in part section

Fig. 5 obtains the point calculated needed for bevel angle value

Fig. 6 is mark 0 ° of bevel angle value position

Fig. 7 is all bevel angle value after label screening

Number description: 1-crimp edge line, 2-crimp curved surface, 3-profile intersection, 4-bottom edge line, 5-crimp trim line tangent line, 6-crimp trim line.

Embodiment

For the aircraft crimp section bar shown in Fig. 1, this section bar and aircraft skin are fitted, and crimp line curvature is complicated, and bevel angle value change is violent, is typical crimp class part.This method is suitable for and various CAD software.This example develops realization based on the CATIA software of Da Suo company by VB, and by reference to the accompanying drawings, the method for crimp part bevel angle value Fast Labeling is described, specific implementation process is as follows:

Program circuit as shown in Figure 2.Extract the correlation parameter of crimp part by Fig. 3, angular clearances is set as 0.5 °.

Step 1: judge bevel angle value type

Any point on the profile intersection 3 extracting part, makes this normal plane on profile intersection 3 with AddNewPlaneNormal function.

As shown in Figure 4, with AddNewIntersection function make normal plane crossing with crimp curved surface 2 after the crimp trim line 6 that obtains, the degree of disturbing of crimp trim line 6 is measured with AddNewExtremum function, the angle value L that disturbs of this example is 0.032mm, disturb angle value and be less than 0.5mm, this crimp shape can use bevel angle value to represent.The starting point crossing crimp trim line 6 with AddNewLineTangencyOnSupport function does crimp trim line tangent line 5.

As in Fig. 4, obtain part crimp termination points A with AddNewPointOnCurveFromPercent function, then measure the distance of part crimp termination points A to crimp trim line tangent line 5 with GetMinimumDistance function, distance S is 0.134mm.Distance value is less than 0.5mm, and therefore, export dialog box with Msgbox function, prompting uses tangent line oblique angle.The bevel angle value size at this place is M.

Step 2: bevel angle value Vector operation

Profile intersection 3 length L is obtained with length function _outward=849.614228mm, substitutes into N=[L _outward/ 5]-1, after calculating, Along ent quantity N is 168.

The Along ent P on profile intersection 3 is made with AddNewPointOnCurveFromDistance function _i, the length of each Along ent on External Shape intersection 3 is L _i.

This example uses tangent line oblique angle, as shown in Figure 5, crosses each Along ent P _ibe the normal plane PL on profile intersection 3 respectively _i, normal plane PL _icrossingly with bottom edge line 4 obtain an A _i, normal plane PL _icrossingly with crimp curved surface 2 obtain crimp trim line L _{curved i}, cross crimp trim line L _{curved i}starting point be crimp trim line tangent line L _{cut i}, get its terminal for a B _i.With GetPoint function measurement point A respectively _i, B _i, P _ithe volume coordinate at place, is respectively (A _iX, A _iY, A _iZ), (B _iX, B _iY, B _iZ), (P _iX, P _iY, P _iZ).Arctan function can only be used, therefore P in VB _ithe bevel angle value θ at place _ifor:

$\begin{array}{c}X=\frac{P_i{A}_i\&CenterDot;P_i{B}_i}{\left|P_i{A}_i\right|\left|P_i{B}_i\right|}\\ =\frac{(A_{\mathrm{iX}}-P_{\mathrm{iX}})(B_{\mathrm{iX}}-P_{\mathrm{iX}})+(A_{\mathrm{iY}}-P_{\mathrm{iY}})(B_{\mathrm{iY}}-P_{\mathrm{iY}})+(A_{\mathrm{iZ}}-P_{\mathrm{iZ}})(B_{\mathrm{iZ}}-P_{\mathrm{iZ}})}{\sqrt{{(A_{\mathrm{iX}}-P_{\mathrm{iX}})}^2+{(A_{\mathrm{iY}}-P_{\mathrm{iY}})}^2+{(A_{\mathrm{iZ}}-P_{\mathrm{iZ}})}^2}\&times;\sqrt{{(B_{\mathrm{iX}}-P_{\mathrm{iX}})}^2+{(B_{\mathrm{iY}}-P_{\mathrm{iY}})}^2+{(B_{\mathrm{iZ}}-P_{\mathrm{iZ}})}^2}}\end{array}$

θ _i＝0° X＝0

Step 3: mark 0 ° of bevel angle value

To all θ _icarry out adjacent comparison, when there is θ _i>0 °, and θ _i+1during <0 °, then at interval [L _i, L _i+1] there is 0 ° of bevel angle value point P ₀, carry out iterative, order

θ _i＝f(L _i)

0°＝f(L ₀)

L ₀≈L

Suppose θ _i=f (L _i) at interval [L _i, L _i+1] be linear change, then have,

$L=g(L_i,L_{i+1})=L_i+(L_{i+1}-L_i)\&times;\frac{f\left(L_i\right)}{f\left(L_i\right)-f\left(L_{i+1}\right)}$

If f (L) < 0 °, by L=g (L _i, L) and iteration, if f (L) > 0 °, by L=g (L, L _i+1) iteration.

If accuracy value §=0.00001

|θ|≤§

Then L ₀=L

Calculate complete.Contrary, when there is θ _i<0 °, and θ _i+1during >0 °, if f (L) < 0 °, by L=g (L, L _i+1) iteration, if f (L) > 0 °, by L=g (L _i, L) and iteration, all the other steps are the same.As calculated, this example one has 0 °, two place bevel angle value.

As Fig. 6, cross some P respectively with AddNewLinePtDir function ₀do the vertical line of profile intersection 3, length is 15mm, subsequently in part geometry characteristics tree using vertical line RNTO " bevel angle value 0 ° " as mark.

Step 4: screening bevel angle value also marks

First, calculation level P ₀and the bevel angle value changing value between neighbouring point | P ₀-θ _i|, if | P ₀-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, secondly, calculation level P _nand the bevel angle value changing value between neighbouring point | P _n-θ _i|, if | P _n-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, finally, calculate all remaining θ _iadjacent bevel angle value changing value | θ _i+1-θ _i|, if | θ _i+1-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i.This example deletes altogether 137 points and bevel angle value, remains 31 satisfactory points and bevel angle value.

As Fig. 7, cross remaining some P respectively _ido the vertical line of profile intersection 3, length is 5mm, and exports " degree divides " form (precision is 10') with Format function on part feature tree, and the bevel angle value θ that mark is corresponding _i.

Claims (1)

1. a crimp part bevel angle value Fast Labeling, it is characterized in that, concrete steps are as follows:

Step 1: judge bevel angle value type

Extract the profile intersection of part, profile intersection is got a point at random, cross the normal plane that this point does profile intersection

By normal plane and crimp surface intersection, obtain crimp trim line, measure crimp trim line degree of disturbing, if be greater than 0.5mm, then bevel angle value can not be used to represent, if be less than 0.5mm, then the starting point crossing crimp trim line does crimp trim line tangent line

Measure the distance of part crimp end points to crimp trim line tangent line, if be greater than 0.5mm, use secant oblique angle, if be less than 0.5mm, use tangent line oblique angle;

Step 2: bevel angle value Vector operation

Measure profile intersection length L _outward, calculate Along ent quantity N=[L _outward/ 5]-1

Profile intersection is made Along ent P _i, the length of each Along ent on profile intersection is L _i

Cross each Along ent P _ibe the normal plane PL on profile intersection respectively _i, normal plane PL _icrossingly with bottom edge line obtain an A _iif use secant oblique angle in step 1, then normal plane PL _icrossingly with crimp edge line obtain a B _iif use tangent line oblique angle in step 1, then normal plane PL _icrimp trim line is obtained with crimp surface intersection cross crimp trim line starting point do crimp trim line tangent line get crimp trim line tangent line terminal for some a B _i, measurement point A respectively _i, B _i, P _ithe volume coordinate at place, calculates P _ithe bevel angle value θ at place _ifor:

Step 3: mark 0 ° of bevel angle value

To all θ _icarry out adjacent comparison, if there is θ _i>0 °, and θ _i+1<0 °, then at interval [L _i, L _i+1]there is 0 ° of bevel angle value point P ₀, carry out iterative, order

θ _i＝f(L _i)

0°＝f(L ₀)

L ₀≈L

Suppose θ _i=f (L _i) at interval [L _i, L _i+1] be linear change, then have,

$L=g(L_i,L_{i+1})=L_i+(L_{i+1}-L_i)\&times;\frac{f\left(L_i\right)}{f\left(L_i\right)-f\left(L_{i+1}\right)}$

If f (L) < 0 °, by L=g (L _i, L) and iteration, if f (L) > 0 °, by L=g (L, L _i+1if) iteration arranges accuracy value §=0.00001

|θ _i|≤§

Then L ₀=L

Calculate complete, contrary, when there is θ _i<0 °, and θ _i+1during >0 °, if f (L) < 0 °, by L=g (L, L _i+1) iteration, if f (L) > 0 °, by L=g (L _i, L) and iteration, all the other steps are the same

Cross some P ₀do the vertical line of profile intersection, and mark bevel angle value 0 ° on part feature tree;

Step 4: screening bevel angle value also marks

If there is 0 ° of bevel angle value point P in step 3 ₀, first, calculation level P ₀and the bevel angle value changing value between neighbouring point | P ₀-θ _i|, if | P ₀-θ _i| be less than the angular clearances of input, then delete θ _iand the P of correspondence _i, secondly, calculation level P _nand the bevel angle value changing value between neighbouring point | P _n-θ _i|, if | P _n-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, finally, calculate all remaining θ _iadjacent bevel angle value changing value | θ _i+1-θ _i|, if | θ _i+1-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i; If there is not 0 ° of bevel angle value point P in step 3 ₀, first, calculation level P _nand the bevel angle value changing value between neighbouring point | P _n-θ _i|, if | P _n-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i, finally, calculate all remaining θ _iadjacent bevel angle value changing value | θ _i+1-θ _i|, if | θ _i+1-θ _i| be less than the angular clearances of input, delete θ _iand the P of correspondence _i

Cross remaining some P respectively _ido the vertical line of profile intersection, and with the bevel angle value θ that " degree divides ", form (precision is 10') mark was corresponding on part feature tree _i.