JPH0643960B2 - Glossiness measuring device for steel wire and measuring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an apparatus and method for measuring glossiness for steel wire,
In particular, the present invention relates to an apparatus and method for accurately measuring the glossiness of stainless steel wires used for wire netting or the like so that there is no variation in the glossiness.

[Conventional background]

When a wire mesh or the like is made of stainless steel wire, using a wire material having a glossy surface brightens the wire mesh and improves aesthetics.

However, in this case, when a wire material having uneven surface glossiness (brightness) is used, there is a drawback in that when the wire mesh is viewed as a whole, the wire mesh has an uneven gloss and the aesthetic appearance is deteriorated.

On the other hand, even when the stainless steel wire is used alone, there is a problem that the brightness of the product may not be uniform if the one having different glossiness is used.

Therefore, the stainless steel wire is inspected for luster and steel wires with the same glossiness are aligned to make a product, but since this inspection is performed visually, the environment of the inspection site (for example, the light condition, Due to differences in inspection angle, position, etc., inspections will vary. Also, since it depends on human vision, there is a problem in reliability.

By the way, regarding the glossiness inspection of plate materials with a flat surface,
Although a gloss measuring device already exists and is used, it is not possible to measure the gloss of a steel wire using this gloss measuring device.

The reason will be described below with reference to FIGS. 6 to 8.

FIG. 6 is a principle diagram of the glossiness measuring device. In the figure,
Reference numeral 1 is an object to be measured, for example, a plate-like body such as a stainless steel plate having a glossy surface, and 2 is a light source. The light of the light source 2 is the first
The plate-like body 1 through the lens 3, the slit 4, and the second lens 5
The reflected light is incident on the light receiver 6 through the third lens 7 and the slit 8.

In the above structure, the light from the light source 2 is collimated by the second lens 5 and strikes the plate-shaped body 1. The line connecting the principal point of the first lens 3 and the center of the slit 4 is the direction of the incident light, and assuming that the incident angle is Φ, the angle α ₁ into the slit 4 from the principal point of the second lens 5 is the opening of the incident light. Out of the light reflected by the plate-shaped body 1 which becomes an angle, only the light flux in the angle α ₂ is extracted by the third lens 7 and the slit 8 into the light receiver 6.

The light received by the light receiver 6 is proportional to the gloss level. Generally, the glossiness of the standard surface is defined as a constant value.
The glossiness of the standard glass surface 11 having a refractive index n = 1.567 shown in the figure was set to 100 regardless of the incident angle, and the reflected light flux at the incident angle θ of this standard glass surface 11 was measured with Φgθ and the same optical system. When the regular reflection light flux of the plate-shaped body 1 shown in FIG. 8 is Φθ, the θ-degree glossiness G _s (θ) of the plate-shaped body 1 is Can be defined as

An optical glass surface having a known refractive index is used as an actual standard plate. The surface with high glossiness is G regardless of the incident angle.
_s is near 100, and the matte surface is 1-2. The glossiness value in the middle depends on the incident angle and the opening angle,
The glossiness of the coating film is 70 or more, the semi-glossy surface is 30 to 70, and the egg shell or matte is 30 or less at a glossiness G _s (60 °). Further, in many cases, G _s is 100 or more on the metallic glossy surface.

[Problems to be solved by the invention]

According to the glossiness measuring device, the glossiness of the plate-shaped body 1 having a flat surface can be measured, but the glossiness of a wire having a curved surface such as a stainless steel wire cannot be measured. . That is, since the surface of the wire to be measured is a curved surface, the incident light from the light source 2 is reflected and dispersed by the surface of the wire, and the reflected light having the intensity necessary for the measurement is taken into the light receiver 6. Therefore, it is impossible to accurately measure the glossiness of the surface of the wire with the conventional glossiness measuring device.

[Means for solving problems]

The present inventor examined the use of a conventionally known glossiness measuring device in order to quantitatively evaluate the glossiness of a wire material having gloss on the surface such as a stainless steel wire. Proved impossible. And to develop a device that can measure the glossiness of the wire surface,
Various studies have been repeated. As a result, according to the luminance meter used for measuring the luminance of LEDs, fluorescent lamps, furnaces, etc., paying attention to the fact that the side surface area of φ0.4 mm to φ0.5 mm can measure the brightness of light. We have developed a new device and method that can measure the glossiness of various steel wires such as stainless steel wires by incorporating a luminance meter into the steel wire moving device and light source.

That is, the gloss measuring apparatus for steel wire of the present invention is provided with a spiral shaft driven by a forward and reverse rotation motor on the base, above the moving table that horizontally moves along the spiral shaft, via the mounting frame, A support base is provided to support the steel wire of the DUT so that it is orthogonal to the horizontal direction, and a micrometer stand equipped with an upward facing micrometer head is provided on this moving base to support the tip of the spindle of this micrometer head. It is installed so that it can come into contact with the bottom surface of the table, and a straight fluorescent lamp is installed above this support table so that the axis of the fluorescent lamp is orthogonal to the axis of the steel wire of the DUT. A brightness meter for measuring the brightness of the reflected light is provided above the support table on which the light of the lamp is incident.

In addition, the measurement method is that the steel wire of the object to be measured is supported on a support table that is finely adjustable up and down on a moving table that horizontally moves along a spiral axis driven by a forward and reverse rotation motor on the base. While moving this steel wire in a direction orthogonal to the moving direction, with a straight fluorescent lamp arranged in a direction in which the axis of the steel wire and the axis of the fluorescent lamp are orthogonal to each other above this steel wire, of the horizontally moving steel wire. The outer peripheral surface is illuminated, and the luminance meter installed above the steel wire continuously measures the change in the brightness of the reflected light reflected from the outer peripheral surface of the steel wire as the steel wire moves. Moreover, the result is graphed, and the maximum measured value of the changing luminance is read as the glossiness of the steel wire.

[Action]

The steel wire placed on the support base is slowly moved horizontally while irradiating the light from the fluorescent lamp. At this time, the light reflected on the surface of the steel wire is incident on the luminance meter, and the glossiness of the surface of the steel wire can be measured by reading the maximum measured value. In addition, at this time, the irradiation light along the axis of the straight fluorescent lamp irradiates the steel wire in a concentrated manner, and even if the condensing means such as a condensing lens is not used, reflection of the brightness necessary for measurement is made in the luminance meter. Light is taken in and the gloss value of the steel wire is measured by reading the peak value of the reflected light.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a steel wire glossiness measuring device according to the present invention,
FIG. 2 is a front view of the same.

In each drawing, 12 is a base, 13 is a holding stand standing on the side edge of the base 12, 14 is a luminance meter attached to the holding stand 13, and 15 is a straight fluorescent lamp also attached to the holding stand 13 as a light source. , 16 are covers of the fluorescent lamp. The luminance meter 14 itself is already known (for example, trade name Minolta luminance meter LS-100, LS-110).

In the luminance meter 14, 17 is a support arm whose base end is fixed to the holding stand 13, 18 is a main body portion provided at the tip of the support arm 17, and 20 is a close-up arranged below the main body portion 18. Lens, 21 is its focus adjustment ring, 2
Reference numeral 2 is a finder provided on the upper portion of the main body portion 18. Furthermore, 23 is a power switch, 24 is a measurement button,
25 is a digital output terminal section. The 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 is a steel wire which is an object to be measured and is supported on a support base 27 below the close-up lens 20, for example, a stainless steel wire. The support base 27 supports the steel wire 26 and can move horizontally (left and right in FIG. 1), and is also supported so as to move slightly in the vertical direction.

The horizontal movement means of the support base 27 will be described in detail below.
28 is a forward / reverse rotation motor arranged on the base 12, 30 is a spiral shaft connected to a drive shaft 31 of the forward / reverse rotation motor 28 via a coupling, and 32 is a movement moving along the spiral shaft 30. It is a stand.

The moving table 32 has a U-shaped guide groove 33 on the lower surface, and the guide groove 33 is slidably fitted on a guide bar 34 installed on the base 12. Further, the spiral shaft 30 is arranged above the guide bar 34 in parallel with the support plate 35 fixed on the base 12, and the spiral shaft 30 is provided on the movable table 32. It is screwed into the screw hole 36. Reference numeral 37 is a connecting frame for firmly supporting the support plate 35.

A mounting frame 38 stands up from the side portion of the moving base 32, and the supporting base 27 of the steel wire 26 is mounted on the mounting frame 38. The support 27 is made of a metal plate having a spring property. Further, a micrometer stand 40 is provided on the moving table 32, 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 come into contact with the lower surface of the support base 27, and the steel wire 26 is pushed by the spindle 42.
The support base 27, on which is mounted, can move up and down while being finely adjusted, and expands the focus adjustment range by the focus adjustment ring 21 of the luminance meter 14. Further, the steel wire 26 supported on the support base 27 is arranged so that its axis line is perpendicular to the axis line of the fluorescent lamp 15.

Here, the straight fluorescent lamp 15 is used as a light source and is arranged so that its axis is orthogonal to the axis of the steel wire 26 for the following reason. That is, in this embodiment, in order not to complicate the apparatus, the light from the light source is directly applied to the steel wire 26 without using a condenser lens, and the reflected light is reflected by the luminance meter 14
The research was conducted on the premise that the measurement was performed at. In this case, we considered using a light bulb and a fluorescent lamp as the light source that is most easily available and inexpensive.

However, although the light bulb was used as a light source for the test, the light of the light bulb was scattered in all directions, and the steel wire 26 could not be intensively irradiated, and the amount of light entering the luminance meter 14 was insufficient. Could not be done. Therefore, the straight fluorescent lamp 15 was used. The light of the fluorescent lamp 15 has a property of irradiating the light along its axis, and particularly when the fluorescent lamp 15 is arranged so that its axis is perpendicular to the axis of the steel wire 26, the fluorescent lamp 1
It was experimentally confirmed that the light along the axis of 5 irradiates the steel wire 26 intensively in the diameter direction, and therefore, the reflected light having the brightness necessary for the measurement can be incorporated into the luminance meter 14. .

For the above reason, in the embodiment, the straight fluorescent lamp 15 is used as the light source and is arranged so that its axis is orthogonal to the axis of the steel wire 26.

Next, a measuring method in the luminance meter 14 will be described with reference to FIGS. 3 and 4. In the case of this luminance meter 14 (product name LS110, manufactured by Minolta Co., Ltd.), a minimum diameter of 0.4 mm to 0.5 mm can be obtained by attaching a close-up lens 20 to the tip.
It is possible to measure within the measurement circle. When this value is applied to the steel wire 26 such as stainless steel which is the object to be measured, it has been experimentally confirmed that the surface glossiness of the steel wire 26 having a diameter of φ1 mm or more and a maximum diameter of 7 mm can be measured.

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

In the figure, 43 is a spot (measurement circle) of φ0.4 mm to φ0.5 mm located at the center of the viewfinder field, 45
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 steel wire 26.

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

Then, the brightness of the reflected light which is reflected on the surface of the steel wire 26 and is incident on the lens of the brightness meter 14 is the fluorescent light 15 which is the light source.
And the positional relationship between the steel wire 26 and the luminance meter 14 causes a slight difference. Particularly, a large number of steel wires 2 that are continuously measured
6 (which is cut to an appropriate size) with a support 27
It is difficult to place it in the predetermined place without any error.

In the present invention, this problem is solved by moving the steel wire 26 along with the support 27 horizontally in the direction perpendicular to the axis thereof. That is, by horizontally moving the steel wire 26 in the direction perpendicular to the axis, the brightness in the spot 43 changes, but at this time, by reading the maximum value, each of the plurality of types of steel wires 26 having different glossinesses is read. The glossiness can be measured with the same standard, and the reliability of the glossiness can be improved. Further, these measured values are sequentially input to the computer 29 for analysis, and the measurement results can be quickly obtained.

In addition, the above-mentioned measurement is performed by the dark screen 47 shown by a two-dot chain line in FIG.
The entire device is covered by the above, and the light from the outside is blocked.

Next, a specific measuring operation will be described with reference to FIGS. At the time of measurement, first, a black standard plate serving as a measurement reference is set on the support base 27, and the value of the reference reflected light is read into the computer 29. Next, the steel wire 2 to be measured
6 is set on the support base 27, the forward / reverse rotation motor 28 is driven, the spiral shaft 30 is rotated, and the support base 27 is moved to measure the glossiness while moving the steel wire 26 on the measurement point. I do. The measurement result is processed by the computer 29 and is displayed in a graph as shown in FIG.

The same figure is a graph showing the glossiness of a certain steel wire. The vertical axis is the magnification with respect to the reference reflected light, and the horizontal axis is each measurement point during horizontal movement of the steel wire 26. The maximum value shown in B is evaluated as the glossiness of the steel wire.

Further, when there is a variation in gloss in the circumferential direction of the steel wire 26, four-point measurement is performed by rotating the steel wire 26 by 90 ° or two-point measurement by rotating it by 180 °. Furthermore, by rotating the steel wire 26 at the position where the maximum glossiness is exhibited, the glossiness with variations in the circumferential direction may be evaluated. The present invention is φ1.0 mm
In addition to φ7.0 mm stainless steel wire, it can be used for measuring the gloss variation of electrolytic polishing wire.

〔The invention's effect〕

According to the present invention, it is possible to quantitatively measure the glossiness of the surface of a steel wire, which has heretofore been impossible, by using a device in which a luminance meter is incorporated in a steel wire moving device and a light source. is there.

In other words, the present invention combines the luminance measuring function of the luminance meter with the horizontal movement of the steel wire having a circular outer circumference, and reads the maximum measurement value (peak value) when the luminance changes due to the movement. Since the glossiness of the steel wire is measured, it is possible to eliminate the risk of an error in the measured value of each steel wire.

Moreover, according to the present invention, no special skill is required for the measurement, anyone can easily perform the measurement, and the glossiness measurement of a large number of steel wires can be quickly processed, and the workability is also improved. Remarkably improved. As described above, according to the present invention, it is possible to eliminate the variation in the inspection due to the visual judgment of the gloss measurement of the steel wire, and it is possible to greatly contribute to the quality control.

[Brief description of drawings]

FIG. 1 is a side view of a steel wire glossiness measuring device according to an embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is an explanatory view of a measurement field of view.
FIG. 4 is a measurement principle diagram of a luminance meter, FIG. 5 is a diagram showing a measurement result of a glossiness of a steel wire, and FIG. 6 is a measurement principle diagram of a conventional glossiness meter, FIG. 7, and FIG. Is also a measurement principle diagram. 14 ... Luminance meter, 15 ... Fluorescent lamp, 26 ... Steel wire, 27 ... Support stand, 28 ... Forward / reverse rotation motor, 30 ... Helical shaft, 32 ... Moving stand, 43 ... Spot.

Claims (2)

[Claims] 1. A spiral shaft driven by a forward / reverse rotation motor is provided on a base, and a steel wire of an object to be measured is set horizontally through a mounting frame above a moving table which horizontally moves along the spiral shaft. In addition to providing a support base for supporting in a perpendicular direction, a micrometer stand equipped with an upward micrometer head is provided on this moving base, and the tip of the spindle of this micrometer head is provided so as to be able to abut on the lower surface of the support base. Further, a straight fluorescent lamp is installed above the support so that the axis of the fluorescent lamp is orthogonal to the axis of the steel wire of the DUT, and the light of the fluorescent lamp reflected by this steel wire is incident on the support. In the upper position,
A luster measuring device for steel wire, comprising a luminance meter for measuring the luminance of this reflected light. 2. A supporting base, which is provided on a base that is horizontally movable along a spiral axis driven by a forward-reverse rotation motor on a base and is capable of finely adjusting up and down, while supporting a steel wire of an object to be measured, This steel wire is moved in a direction orthogonal to the moving direction, and a straight fluorescent lamp arranged above the steel wire in a direction in which the axis of the steel wire and the axis of the fluorescent lamp are orthogonal to each other, the outer peripheral surface of the horizontally moving steel wire. And further measuring the change in the brightness of the reflected light reflected from the outer peripheral surface of the steel wire with the movement of the steel wire by the brightness meter arranged above the steel wire, and A method for measuring the glossiness for steel wire, wherein the results are graphed and the maximum measured value of the changing brightness is read as the glossiness of the steel wire.