CN1257403C

CN1257403C - Method of fast detecting metal plate polargram by utilizing 2-D diffraction

Info

Publication number: CN1257403C
Application number: CNB2004100296539A
Authority: CN
Inventors: 毛卫民; 陈冷; 杨平; 冯惠平
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2004-03-30
Filing date: 2004-03-30
Publication date: 2006-05-24
Anticipated expiration: 2024-03-30
Also published as: CN1563960A

Abstract

The present invention relates to a method of fast detecting metal plate materials pole figures by using 2-D diffraction, which belongs to the technical field of X-ray detection. The method uses a ray 2-D detection system as a detection device to fast measure the ray diffraction data of metal plate materials by using a reflection method within the range of an alpha angle of 0 to 90 degrees in any pole figure, calculates the normal distribution function correspondingly showing texture components by engagement on the basis of the diffraction data and calculates the pole figures of the metal plate materials quantitatively. Under the condition that the detection device does not make any rotation, the method can complete the fast measurement of the diffraction data of the metal plate materials. Thus, the speed of the pole figures of the detection metal plate materials can be greatly increased, and the technique of fast detecting the pole figures of the metal plate materials is developed.

Description

Utilize two-dimentional diffraction to detect the method for sheet metal utmost point figure

Technical field

The invention belongs to X ray detection technique field.

Background technology

Most sheet metals all are polycrystal, and contain sheet material texture to some extent.Sheet material texture is to its performance, and especially anisotropy has very important influence.Therefore sheet metal production run in often need to detect the utmost point figure that expresses sheet material texture, to monitor production run, to guarantee plate property.The modernization large-scale industrial production not only needs the good engineering property of sheet material, but also requires the consistance and the stability of each position performance height of sheet material.Therefore in the production scene to sheet material do continuously, online detection has become the important means of guaranteeing homogeneity of product and stability apace.Though the difficulty of the on-the-spot detection technique of sheet metal texture is very big, production division is pressed for by related industries.Still there is not very effective correlation technique to be applied to commercial production at present.

Can record diagram data through for a long time by rays such as neutron, X ray or electron beams by the single-point logging mode in the laboratory, in order to analyze sheet metal texture.This method complexity, time-consuming can not be applied to the continuous detecting at commercial production scene.The key link that the production scene is detected is to obtain quickly and accurately a large amount of diagram datas.People such as B ttcher and Kopineck have developed a kind of technology [B ttcher of X ray on-line measurement deep drawing sheet steel diagram data, W., Kopineck, H.J., Stahl u.Eisen, 105 (1985), 509-516.Uber einR ntgentexturme β verfahren zur Zerstr mngfreien on-line-Bestimmung TechnologischerKennwerte von Kaltgewaltzten Stahlb  ndem.].The main points of this technology are traditional single-point recording mode of diagram data is modified into the eds detector recording mode of multiple spot.This method has improved the writing speed of diagram data to a certain extent, once tested German Thyssen Krupp iron company deep drawing sheet steel production line [Klinkenberg, C., Schmitz, H.-P., Tamler, H., the proc.12 of being used for ^ThInter.Conf.Texture of Materials, J.A.Szpunar, NRC Research Press, Canada, 1999, vol.1, p.475-480.Texturemeasurement in steel industry practice.].The result shows that the texture information that this method obtains is too simplified, thereby can not obtain high-precision utmost point figure information.Be that the sheet material texture detection technique of checkout equipment development research obtains to have obtained progress on the texture information quickly and accurately with two-dimentional ray detecting system in recent years.Propose among the Chinese patent application publication number CN1425913A " method for quick of stamped steel plate diagram data ", this detection technique needs detecting devices to do a small amount of the rotation obtaining enough data with respect to detected materials, thereby is more suitable in the step-by-step movement and the detection of producing product more continuously.Require the production greater than some high speed sheet metals of 5 meters of per seconds of lower slightly and speed of production for the texture accuracy of detection, then the detection speed of above-mentioned technology still shows fast inadequately.Therefore need development in 20 seconds, promptly can finish accurately and the fast new technology of detection.

Summary of the invention

The invention provides a kind of on two-dimentional ray detecting system basis the method for fast detecting sheet material feature diffraction information, utilize two-dimentional ray detecting system, measure the diffraction data of sheet metal fast with reflectometry, and serve as the normal distyribution function that basis engagement calculates corresponding expression texture component with these diffraction datas, last quantitative Analysis goes out the utmost point figure of sheet metal.The present invention does not do at detecting devices can finish the quick measurement of sheet metal diffraction data under the situation of any rotation, thereby can increase substantially the speed that detects sheet metal utmost point figure, the technology of development fast detecting sheet metal utmost point figure.

The present invention is at first according to the texture characteristic of sheet material to be measured, finds the position of the diffraction data that can obtain to represent the texture principal character in the angle of latitude α of any utmost point figure is the scope of 0～π/4, promptly determines the numerical value of longitude angle β shown in Figure 1; Then the two-dimensional detection default what found, can obtain the position, β angle of texture characteristic diffraction data, and the detection of diffracted data, change the data that obtain one group of diffracted intensity count value with the α angle; Subsequently, the normal state engagement is done in the distribution of the diffracted intensity count value that records along the α angle calculated, obtain the counting peak value that each normal distyribution function meshes out, the position, α angle at peak value place, and intensitometer numerical value is reduced to the e of peak value ^-1The data of the α angular distance of place and peak; Calculate at last the utmost point figure of sheet material by the corresponding crystallographic symmetry of counting the peak of these data and institute thereof.In arbitrary diffraction data scope, mesh the counting peak of 1 to 10 kind of diverse location simultaneously.

Characteristics of the present invention are can be according to the texture characteristics of detected materials, in the scope of utmost point figure angle of latitude α angle 0～π/4, determine a detection position, β angle that can capture a small amount of most critical diffraction information of reflection sheet material texture, do not do under the situation of any rotation thereby make at detecting devices, 20 seconds with the interior testing process of finishing fast.

Description of drawings

The regional domestic demand of the angle of angle of latitude α that Fig. 1 sets in spherical coordinate system for the present invention or pole span angle and longitude angle β is obtained the scope of diagram data, and grey area is to obtain the measurement range of diagram data.

Fig. 2 is the annealing aluminium sheet that records in the ray two-dimensional detection system { plane distribution of the diffracted intensity of α angle from 0 to π/6 on the 200} utmost point figure.

Fig. 3 is along diffraction camber line shown in Figure 2, i.e. the distribution of the diffracted intensity count value that records along the α angle, and solid line is the diffracted intensity count value, dotted line is the normal distribution pitch curve.

{ 200} utmost point figure, heavy line is the α angle from 0 to π/6 measuring position to Fig. 4 among the figure, to obtain diffracted ray shown in Figure 2 for the annealing aluminium sheet that records by the laboratory conventional method.

Fig. 5 is annealing aluminium sheet { the 200} utmost point figure that obtains fast by the technology of the present invention.

Embodiment

Select the annealing pure aluminum plate for use, { 200} utmost point figure as shown in Figure 4 to utilize laboratory conventional sense technology to record it.Solid line among Fig. 4 is exactly { the determined position that can represent the diffraction data of texture principal character in the scope of α angle 0～π/4 of 200} utmost point figure, the β angle of determining this position is 25 °, and the testing result of the X ray two-dimensional detection that obtains on this position as shown in Figure 2.Obtain two normal distributions counting peaks through normal state mesh analysis shown in Figure 3 and calculating.Its peak value is respectively: 112 and 26, and the position, α angle at peak value place is respectively: 0 ° and 36 °, intensitometer numerical value is reduced to the e of peak value ^-1In time, be respectively apart from the α angular distance of peak: 5 ° and 2 °.Calculate thus 200} utmost point figure as shown in Figure 5, with Fig. 4 coincide very good.Detection time is 15 seconds only, and detection speed obviously improves.

Claims

1, a kind of method of utilizing two-dimentional diffraction to detect sheet metal utmost point figure, with two-dimentional ray detecting system is checkout equipment, quantitative Analysis sheet metal utmost point figure is characterized by: the position of determining to represent the diffraction data longitude angle β of texture principal character in the angle of latitude α of any utmost point figure is the scope of 0～π/4; In position, β angle, and detection of diffracted data change the data that obtain one group of diffracted intensity count value with the α angle the two-dimensional detection default; The normal state engagement is done in the distribution of the diffracted intensity count value that records along the α angle calculated, obtain the counting peak value that each normal distyribution function meshes out, the position, α angle at peak value place, and intensitometer numerical value is reduced to the e of peak value ^-1The data of the α angular distance of place and peak.

2, the two-dimentional diffraction of utilization as claimed in claim 1 detects the method for sheet metal utmost point figure, it is characterized by: the counting peak that meshes 1 to 10 kind of diverse location in arbitrary diffraction data scope simultaneously.