CN201037762Y - Tool for measuring arc height - Google Patents

Abstract

The utility model relates to a flection measurement tool, in particular to a measurement tool for measuring preflection when pre-stress short peen is formed. The utility model comprises a scale, a dial indicator and movable support legs, and is characterized in that the dial indicator is vertically arranged in the middle of the scale, and two movable support legs are sleeved on two sides of the scale, and can move and be fixed on the scale.

Description

A kind of camber survey instrument

Technical field

The application relates to the measuring equipment field, further is a kind of instrument of measuring flexibility, the measurement of pre-bending amount when being used in particular for prestress peen forming.

Technical background

Prestress peen forming is to adopt prestress clamp that plate is carried out elasticity pre-bending, reaches the expection shape requirement with ball blasting method then.During pre stress shot peen, being sprayed the surface is to accept projectile impact under tensile stress state, compare with free shot-peening, this kind tension helps to be sprayed the extension of skin-material, deepened the degree of depth of compressive stress layer simultaneously, strengthened the mean value of residual compressive stress in the compressive stress layer, so prestress peen forming enlarges the ability of contour peening, be specially adapted to the shaping of the thick skinpiston of large aircraft complicated double-curvature.

The prestress size that applies during prestress peen forming can be evaluated by the pre-bending value, and the precision of pre-bending directly has influence on the effect of wallboard contour peening, therefore must measure accurately the pre-bending amount, to reach the purpose of effective control.Measurement to the pre-bending amount is generally represented with bending radius, and bending radius can be calculated by the camber value of measuring on the specific chord length, and formula is $R=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{8H}+\frac{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">H</figure-callout>}}{2},$ In the formula, L is a chord length, and H is the camber value, the present invention proposes a kind of instrument that is used to measure camber value on the specific chord length, the problems of measurement of pre-bending amount during with the solution prestress peen forming.

Summary of the invention

A kind of survey instrument contains scale, dial gauge and movable leg, it is characterized in that described dial gauge is vertically fixed on the centre position of scale, and two movable legs are socketed in the both sides of scale and can fix at the scale superior displacement.

Above-mentioned survey instrument, the center line of dial gauge and the centerline of movable leg are in same plane.During use,, measure corresponding camber H by dial gauge by the tape measure chord length L between two movable legs, according to $R=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{8H}+\frac{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">H</figure-callout>}}{2},$ Calculate the value of the radius of curvature R of tested curved surface.Below in conjunction with the embodiment accompanying drawing this application is described in further detail.

Description of drawings

Fig. 1 is the structural representation of camber measuring instrument of the present invention

Fig. 2 be among Fig. 1 A to sectional view

Fig. 3 be among Fig. 1 B to sectional view

Fig. 4 is the user mode signal of camber measuring instrument of the present invention

Number description: 1 housing screw, 2 movable legs, 3 scales, 4 dial gauges, 5[type breach, 6 taper tiptoes, 7 movable contacts, 8 trip bolts, 9 wallboards

Specific embodiment

Referring to accompanying drawing, the body of camber measuring instrument is a scale 3 that the length groove is arranged, and the length groove is benchmark " a 0 " numerical value with the centre position of scale 3, increases to both sides successively.Dial gauge 4 is vertically fixed on the centre position of scale 3 by trip bolt 8, and as shown in Figure 2, the center of the movable contact 7 of dial gauge overlaps with length groove benchmark " 0 " numerical value of scale; Cover is followed a movable leg 2 respectively on the scale 3 of dial gauge 4 both sides, the body of movable leg 2 is one and has [the shaped as frame structure of type breach 5, this frame type structure is socketed on the scale, as shown in Figure 3, the downside of shaped as frame structure is a taper tiptoe 6, the upside of shaped as frame structure has housing screw 1, during loosening pressed screw 1, movable leg 2 is slided along scale 3, tighten housing screw 1, movable leg 2 can be fixed on the precalculated position of scale 3, emphasize here be movable leg body [central lines of the taper tiptoe 6 of the sideline of type breach 5 and downside is so that by [data of movable leg on scale are read in the sideline of type breach 5.

Using method utilizes camber measuring instrument of the present invention to measure the pre-bending amount of wallboard 9 as shown in Figure 4, and its detailed using method is as follows:

1) a given chord length L adjusts two movable legs 2 " 0 " groove both sides to scale 3 respectively The position is fixed movable leg 2 by housing screw 1;

2) horizontality of maintenance scale 3, and the movable contact 7 that makes the taper tiptoe 6 of two movable legs 2 and dial gauge 5 is at same surface level, the band groove table that rotates dial gauge 5 covers, and the Long pointer of dial gauge 5 is overlapped with " 0 " groove, the little dial plate pointer indication initial number H in the record dial gauge 5 ₁

3) the taper tiptoe 6 of the movable leg 2 of camber measuring instrument and the movable contact 7 of dial gauge 5 are contacted with tested wallboard 9, read dial gauge 5 numerical value H ₂4) with H ₁, H ₂, and L substitution formula $R=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{8|H_2-{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">H</figure-callout>}}_1|}+\frac{|H_2-{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="Y20072000332200061.png,Y20072000332200071.png"\; state="\{\{state\}\}">H</figure-callout>}}_1|}{2},$ Can calculate the radius of curvature R of tested wallboard 9.

Claims (4)

1. a camber survey instrument contains scale, dial gauge and movable leg, it is characterized in that described dial gauge is vertically fixed on the centre position of scale, and two movable legs are socketed in the both sides of scale and can fix at the scale superior displacement.

2. camber survey instrument as claimed in claim 1, the centerline that it is characterized in that the center line of described dial gauge and movable leg is in same plane.

3. camber survey instrument as claimed in claim 1, the body that it is characterized in that described movable leg is one and has [the shaped as frame structure of type breach, the downside of shaped as frame structure is the taper leg, and the upside of shaped as frame structure is provided with housing screw, and this frame type structure is socketed on the scale.

4. camber survey instrument as claimed in claim 1 is characterized in that described scale is provided with length groove and numerical value, and the length groove is benchmark 0 numerical value with the centre position of scale, increases to both sides successively.

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