CN106180784A - The control method of lower wall panels drilling burr on a kind of aircraft - Google Patents

Abstract

The invention provides the control method of lower wall panels drilling burr on a kind of aircraft, the pressure loading being applied to wainscot during by controlling drilling controls the deflection of wainscot, the deformation that the lower wall panels compensating drilling axial force P that produced by drilling drilling of lower wall panels and cause produces, thus reach to control the gap between wallboard laminated material, and then the method controlling to produce burr between wallboard interlayer, it is possible to the burr effectively produced during suppression lamination aircraft target ship drilling.When the method can accurately calculate control drilling burr, the normal pressure that should apply.Carried out the regulation of the pressure loading being applied on upper plate by regulation pressure regulating mechanism, and then carry out the control of automatic punching burr.

Description

The control method of lower wall panels drilling burr on a kind of aircraft

Technical field

The invention belongs to airplane component Machining Technology field, lower wall panels drilling burr on a kind of aircraft Control method.

Background technology

In order to make reliably to connect accurately between airplane component, aircraft target ship needs employing to be spirally connected or rivets, at aircraft The critical process link connected during drilling on wallboard, drilling quality directly affects intensity and the life-span of aircraft.Assembly interface burr Production the same with outlet burr, do not process, even if part processing uses optimum technique to realize impulse-free robustness, drilling Time drill bit axial force it is also possible that assembly interface separate, it is impossible to ensure assembly interface impulse-free robustness.The system produced during drilling Hole bur can cause the stress on limit, hole to concentrate, the serious bonding strength and fatigue life being spirally connected or riveting that reduce, reduction aircraft Service life.

Generally use local to apply pressure in drilling and reduce the separation of laminate interface, it is possible to effectively control laminate interface Burr height.As patent CN102513508A invention a kind of can reduce aircraft assembling drilling time lamination burr device.Drilling Before, the first fixing vacuum absorption hold down gag of lamination burr when can reduce aircraft assembling drilling so that it is sucker suction in Product surface, then, is compressed by air cylinder driven pressure foot and compresses product with suitable thrust, finally by auto-feed Boring, the brill riveting set along pressure foot is holed.This patent gives the certain pressure of applying can effectively control drilling Burr between lamination in journey, but do not determine and execute stressed zone of reasonableness.The pressure applied is excessive, can make in aircraft assembling system During hole, product produces excessive deflection deformation, affects assembly precision.Patent CN 102357839A has invented a kind of one-way compression system Hole assay device, a kind of for obtaining the assay device at complex surface drilling parameter.This device is bolted to On workbench, during boring, end effector is moved to position to be processed, adds electro spindle and the pressure ensureing end effector man-hour Tight head is in the normal direction of workpiece, and the hold-down head on end effector is under the thrust of cylinder, and workpiece pressing, at motor Driving under promote electro spindle feeding, complete the processing of workpiece.This patent can effectively control one-way compression hole-making quality, but Do not provide suitable thrust algorithm, with conservative control drilling quality.

After during aircraft manufacturing, commonly used aircraft target ship drilling operation terminates at present, additional labor deburring operation. Artificial deburring efficiency comparison is low, takes time and effort, and is unfavorable for realizing the automatization of drilling.In automatization's drilling process In, typically use robot hole, be sometimes confined to the structure of aircraft target ship, uniaxial pressure can only be used to suppress laminated material The layering at interface.

Summary of the invention

In order to solve the problems referred to above, the invention provides the control method of lower wall panels drilling burr on a kind of aircraft, propose A kind of conservative control puts on the method that the pressure loading of wainscot reaches to suppress burr during drilling to produce.

The control method of lower wall panels drilling burr on a kind of aircraft, the pressure being applied to wainscot during by controlling drilling carries Lotus controls the deflection of wainscot, compensates drilling axial force P that lower wall panels produces by drilling drilling and the lower wall panels that causes is produced Raw deformation, thus reach to control the gap between wallboard laminated material, and then control the method producing burr between wallboard interlayer, Specifically comprise the following steps that

1) according to the drilling structure of wallboard, drilling axial force P during drilling is drawn by test

2) the suitable pressure loading P need to being applied on wainscot when calculating boring_c

2-1 sets up mechanics model according to wall panel structure and material properties, according to step 1) in the drilling that draws axial Power P, the buckling problem of thin plate in Elasticity the differential governing equation deriving elastic surface (includes geometric equation, physics side Journey, equilibrium equation), calculate amount of deflection ω

$D(\frac{{\∂}^2}{\∂r^2}+\frac{1}{r}\frac{\∂}{r}+\frac{1}{r^2}\frac{{\∂}^2}{{\mathrm{\θ}}^2})(\frac{{\∂}^2\mathrm{\ω}}{\∂r^2}+\frac{1}{r}\frac{\∂\mathrm{\ω}}{r}+\frac{1}{r^2}\frac{{\∂}^2\mathrm{\ω}}{{\mathrm{\θ}}^2})=q$

In formula: amount of deflection ω and transverse load q (i.e. drilling axial force P) are the functions of polar coordinate r and θ, and D is wallboard material Bending stiffness

2-2, according to the amount of deflection ω value calculated in step 2-1, sets up the wallboard laminated material mechanical model when drilling:

Upper lower wall panels uses the fixing support of periphery, during drilling cutters drilling lower wall panels, by applying pressure on wainscot Load p_c, compensate the gap between the upper lower wall panels that lower wall panels causes due to flexural deformation that drilling axial force P produces, make upper and lower Wallboard gap value in drilling process is minimum, namely the maximum defluxion deflection of wainscot and lower wall panels is equal, thus controls Burr is produced between wallboard laminated material interface；Calculated respectively by the polar form of the differential governing equation of thin plate elastic curved surface Go out the upper lower wall panels drill center maximum defluxion deflection by concentrfated load and concentric circular load；Concentrfated load in this mechanical model For drilling thrust P during drilling, concentric circular load is the pressure loading P being applied to wainscot_c

Sag general formula is:

Draw according to sag formula above:

Wainscot sag:

Lower wall panels sag:

2-3 calculates suitable pressure loading P_c

Suitably pressure loading P_cEven if also up and down wallboard can not produce excessive deformation, can not gap value excessive,

Drill thrust P causes the maximum deflection amount of deflection of lower wall panels:

${\mathrm{\ω}}_{1\max }={\mathrm{\ω}}_1(r=0)=\frac{{\mathrm{Pa}}^2}{16{\mathrm{\πD}}_2}$

It is applied to the pressure loading P of wainscot_cThe maximum deflection amount of deflection of the wainscot caused:

${\mathrm{\ω}}_{2\max }={\mathrm{\ω}}_{22}(r=0)=\frac{P_c}{8{\mathrm{\πD}}_1}(\frac{a^2-b^2}{2}+b^2\ln \frac{b}{a})$

For making the gap between upper lower wall panels minimum, order: ω_1max=ω_2max

Obtain

I.e. being derived as controlling laminated material interface during upper lower wall panels drilling and produce burr, need to be applied on wainscot is suitable Pressure loading P_c；

3), during drilling, by pressure regulating mechanism, the pressure loading on wainscot is adjusted to the suitable pressure calculated Load p_c, it is achieved the control of burr between upper lower wall panels interlayer during automatic punching.

The present invention has the advantage that as follows:

(1) burr produced during can effectively suppressing lamination aircraft target ship drilling.

(2) when the method can accurately calculate control drilling burr, the normal pressure that should apply.

(3) the method carries out the regulation of the pressure loading being applied on upper plate by regulation pressure regulating mechanism, and then comes Carry out the control of automatic punching burr.

Accompanying drawing explanation

The physical model of Fig. 1 lamination drilling

Fig. 2 is by the mechanical model of concentrfated load upper and lower plates

The physical model of Fig. 3 upper and lower plates drilling stand under load deformation

Numbering explanation in figure: 1, drilling cutters；2, wainscot；3, lower wall panels；The list that Pc, monolateral pressure regulating mechanism apply Limit pressure；P, drilling axial force.

Detailed description of the invention

Describe the present invention the most further.As shown in Figure 1-Figure 3 by radius a=100, thickness Two pieces of aluminium alloy wallboard material laminates of degree d=3 are holed, and apply uniform load P in the position of radius b=10_ch.Real Testing material is 2014Alloy, elastic modulus E=7.30E10, Poisson's ratio μ=0.330.The requirement in hole: Φ 8 ± 0.05.

The pressure loading P of wainscot 2 it is applied to during by controlling drilling_cControl the deflection of wainscot 2, compensate lower wall Drilling axial force P that plate 3 is produced by drilling drilling and deformation that the lower wall panels 3 that causes produces, thus reach to control wallboard lamination The gap of storeroom, and then control the method producing burr between wallboard interlayer, specifically comprise the following steps that

1) according to the drilling structure of wallboard, drilling axial force P during drilling is drawn by test

Drilling axial force P=800N in boring procedure is learnt by test

2) the suitable pressure loading P need to being applied on wainscot 2 when calculating boring_c

2-1 sets up mechanics model according to wall panel structure and material properties, according to step 1) in the drilling that draws axial Power P, the buckling problem of thin plate in Elasticity the differential governing equation deriving elastic surface (includes geometric equation, physics side Journey, equilibrium equation), calculate amount of deflection ω

$D(\frac{{\∂}^2}{\∂r^2}+\frac{1}{r}\frac{\∂}{r}+\frac{1}{r^2}\frac{{\∂}^2}{{\mathrm{\θ}}^2})(\frac{{\∂}^2\mathrm{\ω}}{\∂r^2}+\frac{1}{r}\frac{\∂\mathrm{\ω}}{r}+\frac{1}{r^2}\frac{{\∂}^2\mathrm{\ω}}{{\mathrm{\θ}}^2})=q$

In formula: amount of deflection ω and transverse load q (i.e. drilling axial force P) are the functions of polar coordinate r and θ, and D is wallboard material Bending stiffness

2-2, according to the amount of deflection ω value calculated in step 2-1, sets up the wallboard laminated material mechanical model when drilling:

Upper lower wall panels uses the fixing support of periphery, during drilling cutters 1 drilling lower wall panels, by applying pressure on wainscot 2 Power load p_c, compensate the gap between the upper lower wall panels that lower wall panels 3 causes due to flexural deformation that drilling axial force P produces, make Upper lower wall panels gap value in drilling process is minimum, namely the maximum defluxion deflection of wainscot 2 and lower wall panels 3 is equal, from And control to produce between wallboard laminated material interface burr；Divided by the polar form of the differential governing equation of thin plate elastic curved surface Do not calculate the lower wall panels drill center maximum defluxion deflection by concentrfated load and concentric circular load；This mechanical model collects Middle load is drilling thrust P during drilling, and concentric circular load is the pressure loading P being applied to wainscot_c

Sag general formula is:

Draw according to sag formula above:

Wainscot sag:

Lower wall panels sag:

Bring concrete numerical value into draw

2-3 calculates suitable pressure loading P_c

Suitably pressure loading P_cEven if also up and down wallboard can not produce excessive deformation, can not gap value excessive,

Drill thrust P causes the maximum deflection amount of deflection of lower wall panels 3:

${\mathrm{\ω}}_{1\max }={\mathrm{\ω}}_1(r=0)=\frac{{\mathrm{Pa}}^2}{16{\mathrm{\πD}}_2}$

It is applied to the pressure loading P of wainscot 2_cThe maximum deflection amount of deflection of the wainscot 2 caused:

${\mathrm{\ω}}_{2\max }={\mathrm{\ω}}_{22}(r=0)=\frac{P_c}{8{\mathrm{\πD}}_1}(\frac{a^2-b^2}{2}+b^2\ln \frac{b}{a})$

For making the gap between upper lower wall panels minimum, order: ω_1max=ω_2max

Obtain

I.e. it is derived as controlling laminated material interface during upper lower wall panels drilling and produces burr, need to be applied to

Suitable pressure loading P on wainscot 2_c；

Above procedure brings concrete numerical value into when calculating:

(1) the maximum deflection deflection deformation amount of lower floor's aluminium alloy wallboard is calculated by the buckling problem of thin plate.

$D_2=\frac{{\mathrm{Eh}}^3}{12(1-{\mathrm{\μ}}^2)}=\frac{7.03E^{10}\×{0.003}^3}{12\×(1-0.330)}=2.36E^2$

${\mathrm{\ω}}_1\left(r\right)=\frac{{\mathrm{Pr}}^2}{8{\mathrm{\πD}}_2}\ln \frac{r}{a}+\frac{P}{16{\mathrm{\πD}}_2}(a^2-r^2)=\frac{800r^2}{8\mathrm{\π}\×2.36E^2}\ln \frac{r}{0.1}+\frac{800}{16\mathrm{\π}\×2.36E^2}({0.1}^2-r^2)$

${\mathrm{\ω}}_{1\max }={\mathrm{\ω}}_1(r=0)=\frac{800\×0.01}{16\×3.14\×236}=0.674mm$

(2) by the maximum deflection deflection deformation amount of lower wall panels 3, when calculating laminate interface gap minimum, should apply Pressure loading P_c。

$D_1=\frac{{\mathrm{Eh}}^3}{12(1-{\mathrm{\μ}}^2)}=\frac{7.03E^{10}\×{0.003}^3}{12\×(1-0.330)}=2.36E^2$

${\mathrm{\ω}}_{2\max }={\mathrm{\ω}}_{22}(r=0)=\frac{P_c}{8{\mathrm{\πD}}_1}(\frac{a^2-b^2}{2}+b^2\ln \frac{b}{a})=\frac{P_c}{8\mathrm{\π}\×2.36E^2}(\frac{{0.1}^2-{0.01}^2}{2}+{0.01}^2\×\ln \frac{0.01}{0.1})$

By ω_1max=ω_2max?

The pressure loading P being applied on wainscot 2_cFor

$P_c=\frac{{\mathrm{Pa}}^2{D}_1}{2D_2(\frac{a^2-b^2}{2}+b^2\ln \frac{b}{a})}=\frac{800\×{0.1}^2\×236}{2\×236\×(\frac{{0.1}^2-{0.01}^2}{2}+{0.01}^2\ln \frac{0.01}{0.1})}=939N$

3), during drilling, by pressure regulating mechanism, the pressure loading on wainscot 2 is adjusted to the suitable pressure calculated Power load p_c, it is achieved the control of burr between upper lower wall panels interlayer during automatic punching.

Claims (1)

1. the control method of lower wall panels drilling burr on an aircraft, it is characterised in that be applied to wainscot during by controlling drilling Pressure loading control the deflection of wainscot, compensate drilling axial force P that lower wall panels produces by drilling drilling and cause The deformation that lower wall panels produces, thus reach to control the gap between wallboard laminated material, and then control to produce between wallboard interlayer hair The method of thorn, specifically comprises the following steps that

1) according to the drilling structure of wallboard, drilling axial force P during drilling is drawn by test

2) the suitable pressure loading P need to being applied on wainscot when calculating boring_c

2-1 sets up mechanics model according to wall panel structure and material properties, according to step 1) in drilling axial force P that draws, The differential governing equation being derived elastic surface by the buckling problem of thin plate in Elasticity (includes geometric equation, physical equation, puts down Weighing apparatus equation), calculate amount of deflection ω

In formula: amount of deflection ω and transverse load q (i.e. drilling axial force P) are the functions of polar coordinate r and θ, and D is the bending of wallboard material Rigidity

2-2, according to the amount of deflection ω value calculated in step 2-1, sets up the wallboard laminated material mechanical model when drilling:

Upper lower wall panels uses the fixing support of periphery, during drilling cutters drilling lower wall panels, by applying pressure loading on wainscot P_c, compensate the gap between the upper lower wall panels that lower wall panels causes due to flexural deformation that drilling axial force P produces, make lower wall panels Gap value in drilling process is minimum, namely the maximum defluxion deflection of wainscot and lower wall panels is equal, thus controls wallboard Burr is produced between laminated material interface；Calculated respectively by the polar form of the differential governing equation of thin plate elastic curved surface Lower wall panels drill center is by the maximum defluxion deflection of concentrfated load and concentric circular load；In this mechanical model, concentrfated load is for boring Drilling thrust P when cutting, concentric circular load is the pressure loading P being applied to wainscot_c

Sag general formula is:

Draw according to sag formula above:

Wainscot sag:

Lower wall panels sag:

2-3 calculates suitable pressure loading P_c

Suitably pressure loading P_cEven if also up and down wallboard can not produce excessive deformation, can not gap value excessive,

Drill thrust P causes the maximum deflection amount of deflection of lower wall panels:

${\mathrm{\ω}}_{1\max }={\mathrm{\ω}}_1(r=0)=\frac{{\mathrm{Pa}}^2}{16{\mathrm{\πD}}_2}$

It is applied to the pressure loading P of wainscot_cThe maximum deflection amount of deflection of the wainscot caused:

${\mathrm{\ω}}_{2\max }={\mathrm{\ω}}_{22}(r=0)=\frac{P_c}{8{\mathrm{\πD}}_1}(\frac{a^2-b^2}{2}+b^2\ln \frac{b}{a})$

For making the gap between upper lower wall panels minimum, order: ω_1max=ω_2max

Obtain

I.e. it is derived as controlling laminated material interface during upper lower wall panels drilling and produces burr, the suitable pressure need to being applied on wainscot Power load p_c；

3), during drilling, by pressure regulating mechanism, the pressure loading on wainscot is adjusted to the suitable pressure loading calculated P_c, it is achieved the control of burr between upper lower wall panels interlayer during automatic punching.