JPH0313848A - Apparatus and method for measuring glossiness of steel wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gloss measurement device and method for steel wire,
In particular, the present invention relates to an apparatus and method for accurately measuring the gloss of stainless steel wire used for wire mesh, etc., so that there is no variation in the gloss.

[Traditional background]

When manufacturing wire mesh or the like using stainless steel wire, using wire with a glossy surface will make the wire mesh brighter and improve its aesthetic appearance.

However, in this case, if wire rods with varying surface glossiness (brightness) are used, the wire mesh will give an impression of sparse gloss when viewed as a whole, resulting in a deterioration in aesthetic appearance.

On the other hand, even when stainless steel wires are used alone, there is a problem that if wires with different gloss levels are used, the brightness of the product will not be uniform.

For this reason, stainless steel wires are inspected for gloss, and products are manufactured by aligning steel wires with the same gloss level. However, since this inspection is done visually, the inspection site environment (e.g. lighting conditions, etc.) Differences in inspection angle, position, etc.) may cause variations in inspection. Furthermore, since it pays homage to human vision, there are problems with its credibility.

By the way, regarding the glossiness inspection of plate materials with flat surfaces,
Although glossiness measuring devices already exist and are in use, they cannot be used to measure the glossiness of steel wires.

The reason for this will be explained below with reference to FIGS. 6 to 8.

FIG. 6 is a diagram showing the principle of the glossiness measuring device. In the figure,
2 is an object to be measured, such as a plate-like plate such as a stainless steel plate with a glossy surface, and 2 is a light source. The light from the light source 2 passes through the lens 3, the slit 4, and the second lens 5, hits the plate-like member 1, and is reflected, and this reflected light passes through the third lens 7 and the slit 8, and enters the light receiver 6. .

In the above configuration, the light from the light source 2 becomes a parallel beam of light at the second lens 5, and hits the plate-shaped body 1. The line connecting the principal point of the second lens 3 and the center of the slit 4 is the direction of the incident light, and if the incident angle is Φ, then from the principal point of the second lens 5 to the slit 4
The angle α that includes the angle α is the aperture angle of the incident light, and out of the light reflected by the plate-shaped body 1, only the beam within the angle α2 is taken out in the Φ direction by the third lens 7 and the slit 8, and sent to the light receiver 6. Put it in.

The light received by the light receiver 6 is proportional to the gloss level.

Generally, the glossiness of a standard surface is defined as a constant value, and the standard glass surface 1 with a refractive index of n=1.567 shown in FIG.
1 is 100 regardless of the incident angle, the reflected light flux of this standard glass surface 11 at the incident angle θ is Φgθ, and the specularly reflected light flux of the plate-shaped body 1 shown in FIG. 8 measured with the same optical system is Φθ
Then, the θ-degree gloss Gs(θ) of the plate-shaped body 1 can be defined as Φθ Cps(θ”)=X100Φgθ.

Note that an optical glass surface with a well-known refractive index is used as the actual standard plate. A highly glossy surface has a G
, is nearly 100, and the matte surface is 1-2. The intermediate gloss value varies considerably depending on the incident angle and aperture angle, but it is 60
The degree of gloss G (60 degrees) is 70 or more for the gloss side of the coating, 30 to 7o for the semi-gloss side, and 30 or less for the elastomer or matte side. In addition, in many cases G
.

becomes 100 or more.

[Problem that the invention seeks to solve]

According to the glossiness measuring device, it is possible to measure the glossiness of the plate-like object 1 with a flat surface, but it is not possible to measure the glossiness of a wire rod with a curved surface, such as a stainless steel wire. . That is, since the surface of the wire rod that is the object to be measured is a curved surface, the incident light from the light source 2 is reflected and dispersed on the surface of the wire rod, and the reflected light with the intensity necessary for measurement is taken into the light receiver 6. Therefore, conventional gloss measuring devices could not accurately measure the gloss on the surface of the wire.

[Means for solving problems]

The present inventor considered the use of a conventionally known glossiness measuring device in order to quantitatively evaluate the glossiness of a wire rod with a glossy surface, such as a stainless steel wire. Measurement proved impossible. In order to develop a device that can measure the glossiness of the wire surface,
Various researches were conducted. As a result, we focused on the fact that, according to the luminance meter used to measure the luminance of LEDs, fluorescent lights, furnaces, etc., those with a minimum side surface area of φ0.4 aum to φ0.5 mm can measure the brightness of light. By incorporating a luminance meter into a steel wire moving device and a light source, we have developed a new device and method that can measure the glossiness of various steel wires, including stainless steel wires.

That is, in the steel wire gloss measuring device of the present invention, a luminance meter and a fluorescent lamp are provided in a predetermined arrangement, and a support is installed below the fluorescent lamp so as to be horizontally movable by a moving device. The steel wire is arranged so that its axis is perpendicular to the axis of the fluorescent lamp, and the light from the fluorescent lamp reflected on the surface of the steel wire is focused inside the finder of the luminance meter. This is a characteristic feature.

In addition, the gloss measurement method for steel wire involves moving the steel wire horizontally under a luminance meter and a fluorescent lamp installed in a predetermined arrangement, and measuring the brightness of the fluorescent lamp light reflected on the surface of the steel wire. The method is characterized in that the measurement is carried out using a meter, the results are graphed, and the maximum measured value, which is evaluated as glossiness, is read from the graph.

[For production]

While irradiating the steel wire placed on the support with fluorescent light, the support is slowly moved horizontally.

At this time, the light reflected on the surface of the steel wire is incident on the luminance meter, and by reading the maximum measured value, the glossiness of the surface of the steel wire can be measured.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a steel wire gloss measuring device according to the present invention;
FIG. 2 is a front view of the same as above.

In each figure, 12 is a base, 13 is a holding stand installed at the side end of the base 12, 14 is a luminance meter attached to the holding stand 13, 15 is a straight fluorescent lamp as a light source, which is also attached to the holding stand 13, 16 is a cover for the fluorescent lamp. The luminance meter 14 itself is already known (eg, Minolta luminance meter LS-100, LS-110).

In this luminance meter 14, 17 is a support arm whose base end is fixed to the holding stand 13, 18 is a main body provided at the tip of the support arm 17, and 20 is a close-up image provided below the main body 18. lens, 21 its focusing ring, 2
2 is a finder provided at the top of the main body. Furthermore, 23 is a power switch, 24 is a measurement button,
25 is a digital output terminal section. This digital output terminal section 25 is connected to a computer 29 that operates according to a predetermined program. 39 is a position sensor.

Reference numeral 26 denotes a steel wire, such as a stainless steel wire, which is an object to be measured and is supported on a support stand 27 below the close-up lens 20. The support stand 27 supports the steel wire 26 and can move horizontally (left and right in FIG. 1), and is also supported so that it can move a certain amount in the vertical direction.

Here, the means for horizontally moving the support stand 27 will be explained in detail.
28 is a forward and reverse rotation motor installed on the base 12, 30 is a helical shaft connected to the drive shaft 31 of the forward and reverse rotation motor 28 via a coupling, and 32 is a motor that moves along the helical shaft 30. It is a stand.

The movable table 32 has a U-shaped guide groove 33 on its lower surface, and this guide groove 33 is slidably fitted onto a guide bar 34 installed on the base 12. Further, the helical shaft 30 is connected to a plurality of support plates 3 fixed on the base 12.
5 is disposed above and parallel to the guide bar 34, and the helical shaft 30 is screwed into a screw hole 36 provided in the movable table 32. 37 is a connection frame for firmly supporting the support plate 35.

A mounting frame 38 stands up from the side of the movable table 32, and the support base 27 for the steel wire 26 is attached to this mounting frame 38. Further, this support stand 27 is made of a metal plate having spring properties. Further, the movable table 32 is provided with a micrometer stand 40, and a micrometer head 41 having a spindle 42 facing upward is mounted on the stand 40. The tip of the spindle 42 is provided so as to be able to come into contact with the lower surface of the support base 27, and the support base 27, on which the steel wire 26 is placed while being pushed by the spindle 42, can be moved up and down while being finely adjusted. The focus adjustment range by the focus adjustment ring 21 of the luminance meter 14 is expanded. Further, the steel wire 26 supported on the support stand 27 is arranged so that its axis is perpendicular to the axis of the fluorescent lamp 15.

Here, the reason why the straight fluorescent lamp 15 is used as a light source and arranged so that its axis is orthogonal to the axis of the steel wire 26 is as follows. That is, in this embodiment, in order to avoid complicating the device, the light from the light source is directly irradiated onto the steel wire 26 without using a condenser lens, and the reflected light is sent to the luminance meter 14.
The research was conducted on the premise that it would be measured. In this case, we considered using light bulbs and fluorescent lights as the most easily available and inexpensive light sources.

However, although a test was conducted using a light bulb as a light source, the light from the light bulb was dispersed in all directions, making it impossible to irradiate the steel wire 26 in a concentrated manner, resulting in an insufficient amount of light entering the luminance meter 14, making it impossible to perform the desired measurement. I couldn't do it. Therefore, a straight fluorescent lamp 15 was used. The light of the fluorescent lamp 15 has the property of emitting light along its axis, and especially when the axis is arranged at right angles to the axis of the steel wire 26, the fluorescent lamp 1
It has been experimentally confirmed that the light along the axis of 5 intensively irradiates the steel wire 26 in the diametrical direction, and therefore, the reflected light with the brightness necessary for measurement can be taken into the luminance meter 14. .

For the above reasons, in the embodiment, a straight fluorescent lamp 15 is used as a light source, and its axis is arranged perpendicular to the axis of the steel wire 26.

Next, a measurement method using the luminance meter 14 will be explained with reference to FIGS. 3 and 4. In the case of this luminance meter 14 (manufactured by Minolta, trade name LSI10), by attaching a close-up lens 20 to the tip, the minimum φ0.4sn to φ0.
Measurement within a measuring circle of 5 mm is possible. When applying this value to the steel wire 26, such as stainless steel, which is the object to be measured,
It has been experimentally confirmed that it is possible to measure the glossiness of the surface of a steel wire 26 whose diameter is at least φ1ffff1 at a minimum and up to φ7 mm at a maximum.

To explain further, in order to measure the glossiness of the surface of the steel wire 26, when looking inside the finder 22 of the luminance meter 14, the field of view shown in FIG. 3 appears.

In the same figure, 43 is a spot (measurement circle) of φ0.4 to φ0.5 mm located at the center of the viewfinder field of view;
5 indicates the width of light emitted from the fluorescent lamp 15 and reflected on the surface of the steel wire 26, and 46 indicates the width (diameter) of the copper wire 26.

In the above, the width 45 of the reflected light from the steel vA 26 shines brightly, and the brightness within the spot 43 located at the center of the width (diameter) 46 of the steel wire is measured. Since the brightness within this spot 43 is displayed digitally, the brightness can be read numerically.

Therefore, the brightness of the reflected light that is reflected on the surface of the steel wire 26 and enters the lens of the brightness meter 14 varies slightly depending on the positional relationship between the fluorescent lamp 15 that is the light source and the steel wire 26 with respect to the brightness meter 14. . In particular, a large number of thin wires 26 to be measured continuously
(This has been cut to an appropriate size) It is difficult to place it at a predetermined location on the support base 27 without any dimensional error.

In the present invention, this problem is solved by horizontally moving the steel wire 26 together with the support stand 27 in a direction perpendicular to its axis. That is, by horizontally moving the steel wire 26 in a direction perpendicular to the axis, the brightness within the spot 43 changes. At this time, by reading the maximum value, it is possible to determine the brightness of each of the steel wires 26 of multiple types with different gloss levels. Glossiness can be measured using the same standard, increasing the reliability of glossiness. Further, these measured values are sequentially input into the computer 29 and analyzed, so that measurement results can be obtained quickly.

Note that the above measurements were performed using the blackout curtain 47 shown by the two-dot chain line in FIG.
This is done by covering the entire device and blocking light from the outside.

Next, specific measurement operations will be explained with reference to FIGS. 1 and 2. In the measurement, first, a black standard plate serving as a measurement standard is set on the support stand 27, and thereby the value of the reference reflected light is read into the computer 29. Next, steel wire 2 to be measured
6 is set on the support stand 27, the forward/reverse rotation motor 28 is driven, the spiral shaft 30 is rotated, and the support stand 27 is moved, thereby measuring the gloss level while moving the steel wire 26 over the measurement point. I do. The measurement results are processed by two computers and shown in a graph as shown in FIG.

This figure is a graph showing the glossiness of a single steel wire, with the vertical axis representing the magnification of the reference reflected light and the horizontal axis representing each measurement point during horizontal movement of the steel wire 26. The maximum value shown is evaluated as the glossiness of the steel wire.

Further, when there is variation in gloss in the circumferential direction of the steel wire 26, measurement is performed at four points by rotating the steel wire 26 by 90 degrees, or measurement is performed at two points by rotating the steel wire 26 by 180 degrees. Furthermore, by rotating the steel wire 26 at a position exhibiting maximum gloss, the gloss that varies in the circumferential direction may be evaluated. In addition, the present invention is applicable to φ1.0~
φ7. It can be used to measure gloss variations in electropolishing wires as well as stainless steel wires for θ theory.

[Effects of the Invention] According to the present invention, it is possible to quantitatively measure the glossiness of a wire surface, which was previously considered impossible, by using a device in which a luminance meter is incorporated into a steel wire moving device and a light source. This made it possible.

Moreover, since the measurement is carried out while horizontally moving the steel wire, which is the object to be measured, and the maximum measured value of reflected light is evaluated as the glossiness of the steel wire, there is no possibility of errors occurring in the measured values of each steel wire. be able to.

Further, the measurement does not require any special skill, and anyone can easily perform the measurement. Furthermore, the glossiness measurement of a large number of steel wires can be quickly processed, and the workability is significantly improved. As described above, according to the present invention, it is possible to eliminate the variation in inspection by visual judgment when measuring the glossiness of steel wire,
It can greatly contribute to quality control.

[Brief explanation of drawings]

FIG. 1 is a side view of a steel wire gloss measuring device according to an embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is an explanatory diagram of the measurement field of view.
Figure 4 is a diagram of the measurement principle of a luminance meter, Figure 5 is a graph showing the measurement results of the glossiness of steel wire, Figure 6 is a diagram of the measurement principle of a conventional gloss meter, Figures 7 and 8. is also a diagram of the measurement principle. 14... Luminance meter 15... Fluorescent light 26... Cable wire 27... Support stand 28... Forward/reverse rotation motor 30
...Spiral axis 32...Moving table 43...Spot.

Claims (2)

[Claims] (1) In addition to installing a luminance meter and a fluorescent lamp in a predetermined arrangement, a support stand is installed below the fluorescent lamp so that it can be horizontally moved by a moving device, and the axis of the support stand is aligned with the axis of the fluorescent lamp. A glossiness measuring device for a steel wire, characterized in that the steel wires are arranged so as to be orthogonal to each other, and light from a fluorescent lamp reflected on the surface of the steel wires is focused inside a finder of a luminance meter. (2) Move the steel wire horizontally below the luminance meter and fluorescent lamp installed in a predetermined arrangement, measure the brightness of the fluorescent lamp light reflected on the surface of the steel wire with the luminance meter, and measure the results. A method for measuring glossiness for steel wire, characterized in that the measured maximum value evaluated as glossiness is read from the graph.