JP2927995B2 - Evaluation method of the opening inclination angle of the minute depression on the metal plate surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the angle of inclination of the side surface of an opening of a minute depression regularly arranged on the surface of a metal plate. It is suitable for quantitatively evaluating the shape in the depth direction by evaluating the inclination angle of the side surface of the opening of the annular groove for use (hereinafter referred to as a "dull groove").

[0002]

2. Description of the Related Art A steel plate for painting, particularly a steel plate for an automobile used for an automobile body, is emphasized for its sharpness and press workability after painting. This sharpness means that the irregular reflection of the painted surface is small and the gloss is excellent, and that the image distortion is small and the image quality is excellent. You can create a sense of luxury. For this reason, conventionally, the surface of the roll to which the coating steel sheet is finally subjected to temper rolling is subjected to a so-called dull finish in which the surface of the coating steel sheet is roughened by performing shot blasting or electric discharge machining. Lubricating oil for press working is stored in the valleys of the raised surface to improve the lubricity during pressing and prevent seizure, and the anchor effect of the coating film occurs on the slopes between the peaks and valleys At least, the coating film and the steel plate were firmly fixed.

However, the peaks and valleys of the surface of the steel sheet for coating formed by the conventional shot blasting method or electric discharge machining method are irregular, and the flat surface is small. Therefore, when the surface composed of the irregular peaks and valleys is painted, irregularities are likely to occur on the painted surface due to the influence of the base peaks and valleys, and there is a problem that the sharpness described above is inferior. For this reason, a medium sharpening operation for removing the unevenness is required.

[0004] In order to solve such a problem, the present applicant has previously developed and proposed a steel sheet for coating described on behalf of Japanese Patent Publication No. 3-38923. This coating steel sheet is formed on a surface of a finishing roll A used for temper rolling or the like by a regular circular concave portion B as shown in FIG. C are formed in a regular array, and as shown in FIG.
And the transferred annular groove is referred to as a dull groove E (FIG. 13).

According to the steel plate for coating, the shape of the groove can be arbitrarily set and the number of dents per unit area can be arbitrarily set. ) And the anchor effect of the coating film, while improving the flatness of the steel sheet per unit area and the depth of the dents at will, thereby improving the sharpness.

As an evaluation index of the coating steel sheet having a dull groove (hereinafter referred to as a laser dull steel sheet), a subscript L is a longitudinal direction of the steel sheet, C is a width direction, and as shown in FIG. , DC, dL, dC, dull groove shape: Δ
D, Δd, L1, L2, C1, C2, dull groove filling rate:
α, dull groove pitch: SmL, SmC, dull groove regularity: ΔS, flatness area ratio: η, dull groove depth distribution: H
n, the ditch groove side surface inclination angle distribution: θ, etc. are considered.

As a measuring method for measuring these evaluation indices quickly and with high accuracy, there is a method described in Japanese Patent Laid-Open Publication No. Hei 2-25707, which has been previously proposed by the present applicant, for measuring the surface unevenness pattern. This measurement method irradiates the surface of the measurement object with light from a high-intensity light source at two different irradiation angles,
An enlarged view of the light and dark pattern of the dull groove pattern generated on the surface is taken, and the light and dark image of this surface pattern is analyzed by an image storage processing device, and the two-dimensional positional relationship of the dull groove and the depth of each dull groove are analyzed. The distribution status is calculated and displayed.

According to this measuring method, there is an advantage that at least the two-dimensional positional relationship of the groove can be measured quickly and with high accuracy.

[0009]

However, in the above-mentioned conventional measuring method, various data are calculated by irradiating light and analyzing the light and dark patterns, so that the conditions of irradiating the light are slightly different. In such a case, there is a risk that the essential shape may be misidentified, and therefore, some errors may occur. Above all, there is a large error particularly in the depth distribution of the dovetail groove, and it is difficult to recognize an accurate shape of the dovetail groove in the depth direction. However, as described above, the shape in the depth direction greatly affects the inflow and storage of press lubricating oil and paint for coating, and thus greatly affects press workability and sharpness. Need data. For this reason, a method for quantitatively evaluating the shape of the groove in the depth direction has not been defined so far.

The present invention has been developed in order to solve the above-mentioned problems, and is provided with a depression sampled by a stylus type roughness meter or a non-stylus type roughness meter (laser reflection distance type roughness meter). From the three-dimensional cross-sectional diagram, the shape of the depression in the depth direction can be accurately and easily recognized by creating the inclination angle distribution diagram, and by creating the inclination angle distribution diagram, It is an object of the present invention to provide an evaluation method capable of evaluating sharpness and press formability, which have been difficult to evaluate conventionally.

[0011]

SUMMARY OF THE INVENTION The method of the present invention for evaluating the inclination angle of the opening of a minute depression on the surface of a metal plate evaluates the inclination angle of the side surface of the opening of the minute depression regularly arranged on the surface of the metal plate. In the method, a three-dimensional cross-sectional diagram of a range including a micro recess is collected, and a depth value at a predetermined position suitable for evaluation of an inclination angle is searched from each of the collected three-dimensional cross-sectional diagrams, and each position is determined. Calculating the inclination angle of the position from the rate of change of the depth value in the above, creating an inclination angle distribution diagram from the position and the inclination angle, and evaluating the inclination angle in the inclination angle distribution diagram. Things.

[0012]

According to the method for evaluating the inclination angle of the opening of a minute depression on the surface of a metal plate according to the present invention, a three-dimensional sectional diagram of a range including the minute depression is collected, and the inclination angle is evaluated from each of the collected three-dimensional sectional diagrams. A suitable depth value at a predetermined position is searched for, an inclination angle of the position is calculated from a change rate of the depth value at each position, and an inclination angle distribution diagram is created from the position and the inclination angle. Therefore, for example, in order to evaluate the surface properties (surface shape) of the steel sheet for coating, it is measured and measured in advance using a stylus type roughness meter or a non-stylus type roughness meter (laser reflection distance type roughness meter). In the three-dimensional surface shape data of the orthogonal coordinate system three-dimensional sectional diagram, a depth coordinate at a predetermined measurement point on a predetermined measurement line is searched, and an inclination angle of the measurement point is calculated from a change rate of the depth coordinate. Then, by appropriately interpolating and connecting the inclination angles of those points, the inclination A distribution diagram can be created easily, the shape of the depressions Mino side from the inclined angle distribution diagram, i.e. a recess in the depth direction of the shape can be recognized accurately and easily.

[0013]

FIG. 1 is an example of an apparatus for measuring and evaluating the inclination angle distribution of a dull groove of a laser dull steel plate, which implements the method for evaluating the opening inclination angle of a minute depression on the surface of a metal plate according to the present invention .
This is a surface shape analyzer for evaluating the surface properties of a laser dull steel plate as shown in FIG.

This measuring and evaluating apparatus is roughly divided into a surface shape input unit 1 using a stylus type roughness meter 10 and the like,
A surface shape analysis unit (laser dull groove analysis unit) 2 for analyzing data from the computer and an analysis result display unit 3 for displaying data analyzed by the analysis unit 2. The surface shape input unit 1 includes a roughness meter amplifier 11 that appropriately processes and outputs a Z-axis signal of the stylus-type roughness meter 10, that is, an analog signal in the depth direction of the dull groove E, and And a roughness meter controller 12 for operating the meter 10. In the roughness meter amplifier 11, an A / D converter 13 for digitally converting the analog depth signal, a memory 14 for storing the digitally converted signal, and a D / A conversion for converting the analog signal into an analog signal and outputting the analog signal. A vessel 15 is provided. The scanning direction of the stylus type roughness meter 10 is an X axis,
The horizontal direction orthogonal to the X axis is set as the Y axis.

The analog depth signal output from the roughness meter amplifier 11 is input to the personal computer 16 of the analysis result display unit 3, stored in the memory 18 from the A / D conversion circuit 17 in the personal computer 16, and further connected to the interface. Circuit 19
And is output to the surface shape analysis unit 2. The digital depth signal thus output is input to the surface shape analyzer 20 of the surface shape analyzer 2. This surface shape analyzer 20
In the internal ROM 21, a basic program for surface shape two-dimensional analysis, a basic program for surface shape three-dimensional analysis, a basic program for image analysis, a program for extracting stylus-type roughness meter 10 in the X and Y-axis directions, an interpolation program, etc. Have been. Further, the analyzer 20 includes external FDs 22 and 2 storing surface shape analysis software, laser dull groove analysis software, and the like.
3 is executed, and the three-dimensional surface shape data analyzed by executing the programs is converted into digital data by the interface circuit 1 of the personal computer.
7 is output. The surface shape analyzer 20 and the interface circuit 17 are controlled by mutual control commands.

In the personal computer 16 to which the surface shape three-dimensional digital data is input, an external FD storing surface shape analysis software for the personal computer, laser dull groove analysis software, and the like is stored.
A program is executed by 24 and 25, and the surface shape three-dimensional digital data is calculated and processed.
Or printed out on a printer (not shown). A keyboard 27 and a mouse 28 for inputting commands and messages are also connected to the personal computer 16.

In the program executed by the surface shape analyzing apparatus 20, for example, data processing shown in the flowchart of FIG. 2 is executed, and in the program executed by the personal computer 16, for example, the arithmetic processing shown in the flowchart of FIG. In the data processing shown in the flowchart of FIG. 2, first, in step S1, a control signal for collecting a three-dimensional sectional diagram at a predetermined pitch p shown in FIG. You. The stylus type roughness meter 10 is operated based on the control signal, and the roughness system 1 is operated.
Each data of the Z-axis in the depth direction, the Y-axis in the scanning direction, and the X-axis in the scanning position of the three-dimensional cross-sectional diagram collected by 0 is output.

Next, the process proceeds to step S2, where the digital data of the orthogonal coordinate system of the three-dimensional sectional diagram, which has been digitally converted, is read through the personal computer 16. Next, the process proceeds to step S3, where it is determined whether or not the number of orthogonal coordinate system digital data including at least one dull groove serving as an evaluation unit is n. If the number is n, the process proceeds to step S4. Otherwise, the process proceeds to step S1. This data number n is calculated by, for example, the product of the scanning direction data number s and the scanning position data number t as shown in FIG.

In step S4, as shown in FIG. 6, the center position O of the dull groove is determined from the presumed outer shape and inner shape of the dull groove to be measured. Next, step S
5, the two orthogonal axes C and L in a predetermined direction passing through the center position O are set as shown in FIG. In this embodiment, the C axis is set in the longitudinal direction of the laser dull steel sheet, and the L axis is set in the width direction.

Next, the process proceeds to step S6, where the two orthogonal axes C and L divide the two line segments C 'and L' relating to the dovetail E into ten equal parts as shown in FIG. Points C _i , C ′
_i , L _i , and L ′ _i are calculated as measurement points. Next, the process proceeds to step S7, where each of the measurement points C _i , C ′ _i ,
The depth values at L _i and L ′ _i are searched, and the inclination angles θ _Ci and θ _{Li of the} measurement points C _i , C ′ _i , L _i and L ′ _i are calculated from the rate of change of the depth values. You. The inclination angles θ _Ci and θ _Li are
For example, as shown in FIG. 5, the measurement pitch of the data of the three-dimensional sectional diagram is p, and the respective measurement points C _i , C ′ _i , L _i , L ′ _i
Are the coordinates of the depth values Z _Ci , Z _Li , and the coordinates of the depth values next to the measurement points taken from the three-dimensional sectional diagram are Z _{Ci + 1} , Z
_{If Li + 1} is used, it is calculated based on the following equations (1) and (2).

Θ _Ci = arctan ((Z _{Ci + 1} −Z _Ci ) / p) π · 180 (deg.) (1) θ _Li = arctan ((Z _{Li + 1} −Z _Li ) / p) π · 180 (deg.) (2) Next, the process proceeds to step S8, and the measurement points C _i , C ′ _i , and L are measured in a range including the dull groove and the flat portion inside thereof.
The relationship between _i , L ′ _i and the inclination angles θ _Ci , θ _Li is _plotted as an inclination angle distribution diagram as shown in FIG. In this case, points other than the flat portion and the measurement point are displayed in analog form by appropriately interpolating the three-dimensional digital data.

Next, the process proceeds to step S9, where the data signal calculated or analyzed as described above is output, and the program ends. In the arithmetic processing shown in the flowchart of FIG. 3, first, in step S10, the data signal output in step S9 is read. Next, the process proceeds to step S11, where the maximum tilt angle and its position are calculated for each of the two orthogonal axes from the tilt angle data.

Then, the process proceeds to step S12, where the minimum value of the tilt angle and its position are calculated for each of the two orthogonal axes from the tilt angle data. Next, the process proceeds to step S13, where it is determined whether or not the inclination angle maximum value and the minimum value calculated in steps S12 and S13 are each m, and if they are each m, the process proceeds to step S14. Otherwise, the process proceeds to step S10. In this embodiment, the required data number m is set to six.

In step S14, the average, maximum, and minimum values of the m maximum inclination angles are calculated. Next, the process proceeds to step S15, and the average, maximum, and minimum values of the m inclination angle minimum values are calculated. Next, the process proceeds to step S16, where a control signal for displaying the data calculated as described above on a CRT, a printer, or the like is output, and the program ends.

Next, the operation of the measurement and evaluation apparatus and the measurement and evaluation method processed by the program will be described. As shown in FIG. 4, the tongue groove E to be measured is apparently deep on the right side of the figure and shallow on the left side of the figure, and appears to have substantially the same depth in the vertical direction. First, the orthogonal two axes C and L passing through the center position O of the dull groove E determined in step S4 are determined in step S5 from the digital data of the orthogonal coordinate system three-dimensional sectional diagram read in steps S1 to S3. Set, step S
In S6 and S7, the inclination angles are calculated from the rate of change of the depth value at the predetermined measurement points on the orthogonal two axes C and L, and the inclination angles θ _Ci and θ _Li and the measurement points C _{0 to} C ₁₀ and C are calculated. _'0 ~C' _10, L
₀ and _{~L 10, L '0 ~L'} 10 is represented as the slope angle distribution diagram.

The digital data thus obtained is shown in Table 1 below, and the inclination angle distribution diagrams based on the analog data are shown in FIGS.

[0027]

[Table 1]

Therefore, for example, a target inclination angle distribution diagram of a dull groove having a desired shape in the depth direction is set in advance as shown in FIG. 7, and the target inclination angle distribution diagram and FIGS.
As described above, it is also possible to evaluate the shape of the dull groove in the depth direction by comparing with the inclination angle distribution diagram based on the actually obtained analog data. Next, in steps S11 to S15, the maximum inclination angle, the minimum inclination angle, and the average value A thereof calculated from the inclination angle distribution diagram of the six dull grooves.
Table 2 below shows ve, the maximum value Max, and the minimum value min.

[0029]

[Table 2]

As described above, according to the opening inclination angle evaluation method of the present invention, it is possible to obtain the inclination angle distribution of the individual dull grooves over the entire area of the dull grooves. Further, by digitizing the inclination angle data, the overall evaluation of the plurality of dull grooves can be performed, so that the laser dull steel plate can be evaluated as a product. In the above embodiment, only the case where the stylus-type roughness meter is used as the means for collecting the three-dimensional cross-sectional diagram has been described in detail. However, the collecting means may be other means, for example, recently developed. According to the laser reflection distance meter type roughness meter, more precise data can be collected.

In the above embodiment, the two orthogonal axes C and L divide the two line segments C ′ and L ′ relating to the dovetail groove E into ten equal parts.
Although the dividing points C _i , C ′ _i , L _i , and L ′ _i are set as the measurement points, the setting of the measurement points is not limited to this. In the above embodiment, the method of measuring the opening inclination angle according to the present invention was applied as the evaluation of the dull grooves formed in the steel plate for coating. However, in the same manner, for example, the height of the outer ring of the micro crater formed on the finishing roll was similarly measured. The present invention can also be applied to measurement, and there is no particular limitation on the application target.

Further, in the above embodiment, the measurement of the annular dull groove has been described in detail. However, the present invention can be applied to any depression such as a rectangular annular groove. Furthermore, in the above-described embodiment, the three-dimensional surface shape analysis is processed by a program in a personal computer and a surface shape analysis device. However, the three-dimensional surface shape analysis may be executed by a combination of a theoretical circuit having the same processing function.

[0033]

As described above, according to the depth distribution measuring method of the present invention, a three-dimensional sectional view of a range including a minute depression is collected, and the inclination angle of each of the collected three-dimensional sectional views is determined. Searching for a depth value at a predetermined position suitable for evaluation, calculating an inclination angle of the position from the rate of change of the depth value at each position, and creating an inclination angle distribution diagram from the position and the inclination angle Therefore, the inclination angle distribution state of the side surface forming the depression can be recognized accurately and at a glance. In addition, the shape of the depression in the depth direction can be evaluated from the inclination angle distribution state. Furthermore, the shape of the surface of the metal plate can be evaluated by numerically expressing the state of the inclination angle distribution and simultaneously evaluating a plurality of depressions.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of a tilt angle measurement and evaluation apparatus that implements a method for evaluating the opening tilt angle of a minute depression according to the present invention.

FIG. 2 is a flowchart illustrating a data processing program used in the measurement evaluation method of FIG. 1;

FIG. 3 is a flowchart illustrating an arithmetic processing program used in the measurement evaluation method of FIG. 1;

FIGS. 4A and 4B show an example of a dull groove actually measured in the embodiment, in which FIG. 4A is a plan view, FIG. 4B is an RR cross-sectional view of FIG. 4A, and FIG. It is SS sectional drawing.

FIG. 5 is an explanatory diagram of depth coordinates of a three-dimensional cross-sectional diagram obtained by the method for evaluating an opening inclination angle of a micro recess according to the present invention.

FIG. 6 is an explanatory diagram of orthogonal coordinate system data of a three-dimensional cross-sectional diagram collected by the method for evaluating the opening inclination angle of a minute depression according to the present invention.

FIG. 7 is an explanatory diagram showing a correlation between a micro pit and a tilt angle distribution diagram which are plotted by the method for evaluating the opening tilt angle of a micro pit according to the present invention.

FIG. 8 is an example of a tilt angle distribution diagram plotted in the embodiment.

FIG. 9 is another example of a tilt angle distribution diagram plotted in the embodiment.

FIGS. 10A and 10B are explanatory diagrams of a dovetail groove and an evaluation criterion of a steel plate in which the dovetail groove is formed, wherein FIG. 10A is a plan view, FIG. 10B is a detailed plan view of one dovetail groove, and FIG. It is TT sectional drawing of (b).

11A and 11B show a micro crater formed on a roll surface, where FIG. 11A is a longitudinal sectional view and FIG. 11B is a plan view.

FIG. 12 is a vertical cross-sectional view illustrating a transfer state of a dovetail groove by a micro crater.

FIGS. 13A and 13B are views showing dull grooves transferred to the surface of the steel sheet, wherein FIG. 13A is a plan view and FIG. 13B is a longitudinal sectional view.

[Explanation of symbols]

 1 is a surface shape input unit 2 is a surface shape analysis unit 3 is an analysis result display unit

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-64-35308 (JP, A) JP-A-58-169010 (JP, A) JP-A-62-230402 (JP, A) JP-A-63-63 50488 (JP, A) JP-A-63-303607 (JP, A) JP-A-3-161103 (JP, A) JP-A-64-35308 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 11/00-11/30 G01B 21/00-21/30 G01B 7/00-7/34

Claims (1)

(57) [Claims] 1. A method for evaluating an inclination angle of a side surface of an opening of a minute depression regularly arranged on a surface of a metal plate,
A three-dimensional cross-sectional diagram of a range including a micro recess is collected, and a depth value at a predetermined position suitable for evaluation of an inclination angle is searched for from each of the collected three-dimensional cross-sectional diagrams, and a depth value at each position is determined. The inclination angle of the position is calculated from the change rate, an inclination angle distribution diagram is created from the position and the inclination angle, and the inclination angle is evaluated in the inclination angle distribution diagram. Evaluation method of the inclination angle of the opening of the depression.