CN1138125C - Method for measuring curvature radius of large dimension bent quenched rib - Google Patents

Abstract

The present invention relates to a method for measuring the curvature radius of large size bending and quenching ribs. The method comprises: the moving direction of a measuring roller is the same with the moving direction of a profiling roller; the present invention adopts a single-point contact manner, the measuring roller is in single-point contact with the lower edge of the bending and quenching ribs, a linear displacement sensor driven by the measuring roller measures the variable quantity X value of the bending and quenching ribs on the moving direction of the measuring roller, the curvature radius R value of the bending and quenching ribs is reckoned up by the geometric relationship of a bending and quenching device, and the computation formula is R = (M <2> + X<2>-2MXSin theta) /2XCos theta + r. The present invention can lighten the labor intensity of workers, and enhance the precision of measuring the curvature radius of the large size bending and quenching ribs.

Description

A kind of method of measuring curvature radius of large dimension bent quenched rib

Technical field

The present invention relates to shipbuilding industry, specifically is to build the i.e. amount calculation method of curved " rib " radius-of-curvature of quenching of submarine reinforcement.

Background technology

At present, in shipbuilding industry, promptly curved " rib " radius-of-curvature of quenching of reinforcement of building submarine requires from 1.25 meters～6 meters several specifications, wherein: determine the initial position of profile shell and angle theta between the moving direction of profile shell and the Y-axis according to the size that will process the rib radius.Long 9 meters of every root bone, except that in one meter length, allowing 5 millimeters tolerances, poor≤1 of the radius-of-curvature of remainder and theoretical radius millimeter.Dimension bent quenched rib carries out continuously, is about to be welded together one by one by the curved shaped steel of quenching, and cuts one by one after curved the quenching again.Obviously, make high-precision rib and must measure its radius-of-curvature accurately.General processing rib is that the workman constantly tests the curved rib of quenching with set " pattern ", adjusts the amount of feeding of profile shell again according to the result of each test, to obtain desired radius-of-curvature.This kind method not only working strength of workers is big, can not ensure the curved precision of quenching again.

Summary of the invention

In order to overcome above-mentioned deficiency, the purpose of this invention is to provide a kind of method that can alleviate labor strength, improve measurement curvature radius of large dimension bent quenched rib precision.

To achieve these goals, technical scheme of the present invention is: keep the moving direction of measuring roller identical with the moving direction of profile shell, adopt the single-point contact, be that the measuring roller single-point is contacted with the dimension bent quenched rib lower edge, measure the variable quantity X value of dimension bent quenched rib on the moving direction of measuring roller by the Linear displacement transducer that measuring roller drives, calculate the radius of curvature R value of dimension bent quenched rib again by the geometric relationship of the curved equipment of quenching;

Described Calculation of curvature radius R value mathematic(al) representation is:

R＝(M ²+X ²-2MXSinθ)/2XCosθ+r

Wherein M be the initial position in measuring roller axle center to curved distance between quenching a little, θ is the measured angular of formation after the extended line of moving direction and the axis, principal plane forward position of Medium frequency induction coil of measuring roller intersects, r is the measuring roller radius.

The present invention has simple, not limited by environmental baseline, both can alleviate working strength of workers, has guaranteed advantages such as measuring accuracy again, also can be widely used in the radius of curvature measurement of other large-scale workpiece.

Description of drawings

Fig. 1 is inventive principle figure.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further details.

The moving direction of maintenance measuring roller 3 of the present invention is identical with the moving direction of profile shell 4, measuring roller 3 single-points are contacted with dimension bent quenched rib 2, measure the variable quantity X value of dimension bent quenched rib 2 on the moving direction of measuring roller 3 by the Linear displacement transducer 5 that measuring roller 3 drives, again by the radius of curvature R value of the geometric relationship calculating of bending the equipment of quenching by dimension bent quenched rib 2;

Described Calculation of curvature radius R value mathematic(al) representation is:

R＝(M ²+X ²-2MXSinθ)/2XCosθ+r

Wherein M be the initial position in measuring roller 3 axle center to curved distance between quenching a little, θ is the measured angular of formation after the extended line of moving direction and the axis, principal plane forward position of Medium frequency induction coil 1 of measuring roller 3 intersects, r is measuring roller 3 radiuses.

Embodiment 1

As shown in Figure 1, the principal plane forward position axis EE ' of wherein said Medium frequency induction coil 1 is with perpendicular by the lower edge straight line BC of the shaped steel initial position of dimension bent quenched rib 2, measuring roller 3 single-points are contacted with dimension bent quenched rib 2 lower edges, intersecting intersection point with the extended line of the moving direction of fixing the Linear displacement transducer 5 on it and EE ' is O, the angle of cut is θ, claim that herein the θ angle is a measured angular, convenience for quantitative Analysis, foundation is that origin of coordinate, EE ' direction are that Y-axis and BC direction are the rectangular coordinate system (XOY) of X-axis with the O point, and measuring roller 3 shaft core positions are O _o, with the point of contact of BC straight line be D _oSo, $\stackrel{\&OverBar;}{O_o{D}_o}=r$ Be the radius of measuring roller 3, $\stackrel{\&OverBar;}{O_{o}F}=M$ Initial position O for measuring roller 3 axle center _oTo curved distance of quenching between the F, O ₁Be the curvature circle-center of dimension bent quenched rib, to the center of circle O of different curvature radius ₁Position on Y-axis is different, establishes Linear displacement transducer 5 and measures the variable quantity of dimension bent quenched rib 2 on the moving direction of measuring roller 3 and be $\stackrel{\&OverBar;}{O_o{O}_X}=X,$ Be the displacement (changing value of radius-of-curvature) in measuring roller 3 axle center, dimension bent quenched rib 2 radius-of-curvature $\stackrel{\&OverBar;}{O_1{D}_o}=R,$ Wherein measured angular is θ, and parameters such as radius of curvature R are constant.

At right-angle triangle AO _xO ₁In, because $\stackrel{\&OverBar;}{{\mathrm{<figure-callout\; id="1"\; label="O\; X\; O"\; filenames="C9911301900061.png"\; state="\{\{state\}\}">O</figure-callout>}}_X{O}_{}^{}{}_1^2}={(R-r)}^2,$

(R-r) ²＝[(R-r)-XCosθ] ²+[M-XSinθ] ²

＝[(R-r) ²+(XCosθ) ²-2(R-r)(XCosθ)]+

M ²+(XSinθ) ²-2MXSinθ

So (R-r)=M ²+ X ²-2MXSin θ/2XCos θ

R＝(M ²+X ²-2MXSinθ)/2XCosθ+r

Embodiment 2

Difference from Example 1 is:

At arbitrary triangle Δ O _xO ₁Among the O: establish $\stackrel{\&OverBar;}{\mathrm{<figure-callout\; id="1"\; label="O\; O"\; filenames="C9911301900061.png"\; state="\{\{state\}\}">O</figure-callout>}{O}_{}{}_1}=a,\stackrel{\&OverBar;}{O{O}_X}=b,\stackrel{\&OverBar;}{O_1{O}_X}=c,$ Ask the formula of the c length of side with arbitrary triangle both sides a, b and angle ∠ C:

c ²＝a ²+b ²-2abCosC

Again at right-angle triangle Δ O _oAmong the FO: establish $\stackrel{\&OverBar;}{O_{o}O}=L,\stackrel{\&OverBar;}{O_{o}F}=M,$ OF=N; Angle is θ.

A=N-(R-r) then, b=L-X, c=R-r; CosC=Cos θ.

Because of N=LCos θ, M=LSin θ, X are that Linear displacement transducer 5 (adopting the grating chi here) is measured length again.

So (R-r) ²=[N-(R-r) ²+ (L-X) ²-2[N-(R-r)] (L-X) Cos θ

Draw (R-r)=(M through derivation ²+ X ²-2XMSin θ)/2XCos θ

So R=(M ²+ X ²-2XMSin θ)/2XCos θ+r

The used device of the present invention is a prior art, and wherein the Linear displacement transducer 5 of measuring roller 3 drives can be the grating chi of band vernier, also can be current potential bucket, LVDT and incremental encoder, can be the micropulse displacement transducer especially.

Claims (1)

1. method of measuring curvature radius of large dimension bent quenched rib, it is characterized in that: keep the moving direction of measuring roller (3) identical with the moving direction of profile shell (4), adopt the single-point contact, be that the measuring roller single-point is contacted with dimension bent quenched rib (2) lower edge, measure the variable quantity X value of dimension bent quenched rib (2) on the moving direction of measuring roller (3) by the Linear displacement transducer (5) that described measuring roller (3) drives, by what relation of youngster of the curved equipment of quenching calculate the radius of curvature R value of dimension bent quenched rib (2) again;

Described Calculation of curvature radius R value mathematic(al) representation is:

R＝(M ²+X ²-2MXSinθ)/2XCosθ+r

Wherein M be the initial position in measuring roller (3) axle center to curved distance between quenching a little, θ is the measured angular of formation after the extended line of moving direction and the axis, principal plane forward position of Medium frequency induction coil (1) of measuring roller (3) intersects, r is measuring roller (a 3) radius.

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