JPS62100646A - Method and apparatus for evaluating surface-treated plate - Google Patents

Abstract

PURPOSE:To enable accurate measurement of light transmissivity continuously in a short time, by employing infrared rays as transmission light while a filter circuit is attached to allow only the passage of electrical signals corresponding to the modulation frequency on the side of a light receiving section. CONSTITUTION:A molded material 5 to be inspected is adhered to a sticky transparent tape 10 and powder falling from the material 5 being inspected attaches to the tape 10. The tape 10 is carried until the powder-attached part thereof is positioned on a tape-holding plate 9 and a modulation infrared rays are projected through a lens 6a from an infrared-ray emitting diode 6b. A photoelectric element 7a senses light transmitted through the tape 10 and after the photoelectric conversion thereof, a bandpass filter 7b transmits only a signal component corresponding to the modulation frequency. Then, based on the quantity of light passing through the filter 7b, a light transmissivity measuring device 7c in which the quantity of light transmitted through a tape having no powder attached is preset determines light transmissivity by a specified formula. In addition, an attachment value converter 7d calculates the amount of missed powder by a specified conversion method from the resultant light transmissivity.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention aims to reduce the degree of shedding of powder on the surface (powdering) during forming and pressurizing a metal plate that has been surface-treated. Fallen pine cover M' attached to adhesive transparent tape
By optically measuring 9 of A (powder),
This relates to a quantitative evaluation method and W position.

[Prior art]

When forming a surface-treated metal plate (hereinafter referred to as a surface-treated plate), the coating on the surface-treated plate can follow the deformation of the substrate against elongation deformation such as in stretch molding, but it also includes shrinkage deformation. In drawing forming, it is important to evaluate the degree of collapse or peeling of the coating because it tends to occur. Therefore, various methods of optically measuring the amount of powder adhering to a transparent tape have been conventionally used to evaluate the degree of powdering during surface treatment temporary molding.

FIG. 6 is a schematic diagram of an apparatus for carrying out the conventional evaluation method, in which 41 is a condenser lens, 42 is a filter, and 43 is a transparent plastic plate. A transparent tape 45a is attached to the transparent plastic plate 43, and the condenser lens 41. The light passed through the filter 42 is irradiated onto the transparent plastic plate 43 to which the transparent tape 45a is attached, and the transmitted light itAa is measured by the light receiving section 44, and the transmittance 1o in this case is set as 100%. Next, a transparent tape 45b of the same type as the transparent tape 45a is adhered to the measurement site of the molded material to be inspected, and it is peeled off and affixed to the transparent plastic plate 43, and the amount of transmitted light A is measured in the same manner as described above. Total 7. Calculate the transmittance r by lJ f =
□X100), the difference between cough transmission O premature ■ and the transmittance 1G (=100) is determined as a concrete rate (blackening rate (%) -100-1). In this case, the degree of powdering can be evaluated by calculating the blackening rate, since the more fallen matter adheres to the tape, the higher the solidification rate becomes.

In addition to the method described above, a spectrophotometer is used to simultaneously irradiate light of the same wavelength to the removable transparent tape that was adhered to the molded material to be inspected and then removed, and to the unused transparent tape. When the transmittance of the transparent tape used is 100
There is also a method of measuring the transmittance of the 11!1iIl transparent tape and evaluating the degree of powdering based on the measured value.

[Problem that the invention seeks to solve]

In the conventional method described above, it is possible to evaluate the degree of powdering because there is a correlation between the amount of powdered valleys on the tape and the amount of X3 excess light, but the measuring device is large due to the power supply of the light projecting part. Therefore, it is difficult to use as a portaple type at production sites, and for accurate measurements, a shielding material is required to block environmental light such as electric light, fluorescent light, sunlight, etc. However, when a material is used, it has the disadvantage that it is difficult to confirm the measurement area with the naked eye.

In addition, in the conventional method, a tape is closely attached to a specific part of the molded material to be inspected, and then the tape is peeled off to obtain the powder-coated tape as a measurement sample. It is practically impossible to keep the adhesion of the tape to the inspected molded material and the peeling force of the tape constant, making accurate evaluation impossible, and it takes a lot of effort and time to measure manually. The problem was that it required

[Means for solving problems]

The present invention has been made in view of the above circumstances, and its purpose is to change the luminous intensity at an appropriate frequency.
Infrared light subjected to M is used as transmitted light, a filter circuit is added on the light receiving part side to pass only the electrical signal according to the modulation frequency, and the tape is further configured to be automatically bonded and peeled off. The surface-treated plate allows the measuring device to be small and does not require any special light-shielding material, allowing the measurement area to be confirmed with the naked eye, and making it possible to measure light transmittance continuously in a short time. The purpose of the present invention is to provide an evaluation method and apparatus for

The method for evaluating a surface-treated board according to the present invention involves adhesively pressing a surface-treated transparent tape with adhesive strength, peeling off the transparent tape, and shining light onto the transparent tape to which the surface-treated IFJ powder has adhered. In this method, by measuring the light transmittance of the light transmittance, the state of powdery shedding of the surface coating during temporary surface treatment molding processing is evaluated. It is characterized by transmitting external light and measuring the infrared light transmittance.

〔Example〕

The present invention will be specifically described below based on drawings showing its implementation state. FIG. 1 is a schematic diagram of the evaluation 1i11i device according to the present invention, in which 1 is an adhesive transparent tape rewinding reel, 2 is an adhesive transparent tape rewinding reel;
is a sticky tape take-up reel. An adhesive transparent tape 10 is unwound from an adhesive transparent tape rewind reel 1, and a tape pressure bonding roll 3 installed between the 21 and 21 reels. Guide[]-le4. Tape holding plate 9 and guide roll 41
The tape is generally fed through the tape in the direction indicated by the arrow in the figure, and is wound onto a take-up reel 2 of the adhesive transparent tape.

Here, since the adhesive surface of the adhesive transparent tape 10 is upward in the figure, both tape pressure rollers 3 and 3 are provided on the lower side. Guide roll 4. It is not adhered to the tape holding plate 9.

On the opposite side of the tape pressure roll 3 sandwiching the adhesive transparent tape 10, there is a test object 1.45 (
(a perspective view is also shown in FIG. 1) is supported by a roll (not shown), and when the adhesive tape 10 is IM-fed between the material to be inspected 5 and the tape pressure roll 3, It is pressed against the tape pressure roll 3 and rotates in conjunction with it, and the pressure of the tape pressure roll 3 causes it to become sticky. 7) The fallen pieces of the VC test material 5 are attached to the transparent tape 10. In addition, the inspected transparent tape 10 is designed so that it is removed from the roll (not shown) when it starts adhering to the adhesive transparent tape 10 and rotates for the number of rotations. Samples are taken from the entire circumferential surface of the material to be inspected 5 without overlapping or overlapping by a rotational speed of Ω.The tape holding plate 9 is a transparent plate, and an adhesive transparent tape is used to prevent the tape from wrinkling at the inspection site. 10 is supported.

Between the guide rolls 4, 4, there is an infrared light emitter 6 and an infrared light receiver 7. ,! : are installed at positions facing each other with the adhesive transparent tape 10 in between. The infrared light projecting section 6 is a lens 6
a + infrared light emitting diode 6I] 1 light emitting diode, equipped with an iode modulation device 6c, and a light emitting diode modulation device 6c.
For example, it is connected to a power source 8, which is a dry battery. Then, as a result of the light emitting diode modulation device 6c, the infrared light modulated at an appropriate frequency is projected from the infrared light emitting diode 6b onto the bonded transparent tape 10 through the lens 6a. ing.

On the other hand, the infrared light receiving section 7 includes a light receiving element 7a whose light receiving frequency band is infrared light, a bandpass filter 7b, a light transmission measurement device 7c, and a coating amount converter 7d.

Then, the infrared light emitted from the infrared light emitting diode 6b is projected onto the adhesive transparent tape 10 that is generally fed on the tape holding plate 9.
The transmitted light is sensed by the light receiving element 7a and converted into an electrical signal. The converted electrical signal is passed through a bandpass filter 7b in which only components in a certain frequency band centered around the variable SIM frequency of the light emitting diode modulator 6C are passed, and the light transmittance is measured by a light transmission measurement device 7C. ,Additionally,?
? The amount converter 7d converts the light transmittance measured by the light transmittance measuring device 7C into the amount of powder deposited (falling off amount) based on a method described later.

Next, a specific procedure for measuring the amount of powder falling off will be explained. First, the adhesive transparent tape 10 is conveyed from the adhesive transparent tape unwinding reel 1 to the adhesive transparent tape take-up reel 2, and during this conveyance, the molded inspected material 5 is transferred to the adhesive transparent tape by the pressing force of the tape pressure roll 3. The powder adhering to the adhesive transparent tape 10 and falling off from the inspected material 5 is
Attach to 0.

The adhesive transparent tape 10 is conveyed until the part to which the powder has adhered is placed on the tape holding plate 9-1, and the modulated infrared light is emitted.
It is projected onto the adhesive transparent tape 10 (the part to which the powder is attached). Then, the photoelectric element 7a senses the light that has passed through the adhesive transparent tape 1O, and performs photoelectric conversion (the multi-bandpass filter 7b transmits only the signal component corresponding to the modulation frequency.Then, the amount of light passing through the bandpass filter 7b is changed to Based on this, the light transmittance meter 7c, which has previously set the amount of light passing through the tape to which no powder is attached, calculates the light transmittance using the following equation (1).

X100 ... (+1) Adhesion amount (9 calculator 7d is the light 1 calculated using the above formula (1)
Based on the pass rate, convert it into the amount of powder falling off using the method described in 1ζ below [).

Figure 2 shows the square root value of powder shedding amount (ti (axis: eye position y/H (H /
cm) is a graph showing the relationship between bs, same-l! For the surface treatment plate on the cheek, use a camphor tree like the one shown in Figure 2 in advance. If the data is set in the adhesion amount converter 7d, it can be converted to the amount of powder deposit by comparing the light transmittance with the calibration data.

Next, the action of the bandpass filter 7h will be explained. , FIG. 3 is a graph showing a signal frequency spectrum when an infrared light source is pulse-driven and modulated at an appropriate frequency, where the horizontal axis shows the frequency and the vertical axis shows the output (spectral amount). In addition, +a+ in the figure is an infrared light emitting diode 6b,
(bl represents the spectral frequency of the light receiving element 7a of the infrared light receiving section 7, and fcl represents the spectral frequency of the band pass filter 7b.In the present invention, the light receiving element 7a emits infrared light and has a light receiving frequency band in the infrared region. Since the infrared light is received by the infrared light, there is no influence of light other than infrared light.Furthermore, only the signal component corresponding to the variable 1!it frequency of the infrared light emitting diode 6b is filtered by the bandpass filter 7b. , direct current components originating from sunlight, and low-frequency noise components from fluorescent lamps [Figure 3 (A), (B), and (T)] can be removed.

Therefore, the light transmittance of the adhesive transparent tape 10 to which the powder is attached can be accurately detected without being interfered with by environmental light. Therefore, in the present invention, by filtering the transmitted light with the bandpass filter 7b, it is possible to accurately measure the light transmittance even under various environmental lights without providing a special light shielding material.

Next, the wavelength of the infrared light irradiated onto the adhesive transparent tape 10 will be explained. FIG. 4 is a graph showing the wavelength dependence of light transmittance, where the horizontal axis shows the transmitted light wavelength (+@ nm) and the vertical axis shows the light transmittance (unit: %).

In addition, the graph in the figure (al represents the light transmittance of the unused transparent tape to the air, fbl represents the light transmittance of the powder-adhesive tape to the air, and (e) represents the light transmittance of the powder-adhesive tape to the unused transparent tape, respectively. There is.

As can be understood from Figure 4, graph F
Since the light transmittance of C+ is approximately constant, even if infrared light is used as a light beam for projection, the light transmittance can be measured in the same way as visible light.

Figure 5 shows the wavelength (horizontal axis: unit: nm) and intensity (vertical axis: unit: p w/c++t-nm) of the spectrum of direct sunlight.
As understood from FIG. 5, the spectrum has a maximum near 500 nm, but the intensity decreases as the wavelength becomes longer.

If sunlight is considered as interference light during measurement, its high intensity may cause an error, so it is better not to use light in the visible light range with a wavelength of 400 to 700 nm.

On the other hand, as the wavelength becomes longer (2500 r+m or more), the intensity of sunlight decreases, but a phenomenon occurs in which the adhesive transparent tape itself absorbs most of the light, making accurate measurement impossible. Therefore, the wavelength of the infrared light to be irradiated is 700 to 2500 nm.
Make it. The above-mentioned reasons are the reasons for limiting the numerical value of the infrared light wavelength.

〔effect〕

Under three types of environmental light (sunlight, fluorescent light, incandescent light),
The average value and standard deviation of the light transmittance (measured 20 times each) when using the conventional spectrophotometer and the device of the present invention are shown in Table 1 below. However, with conventional spectrophotometric needles, measurement results are shown for cases in which a light shielding material is used and cases in which a light shielding material is not used.

Table 1 The device of the present invention can obtain an average value of light transmittance that is approximately the same as that of a spectrophotometer using a light shielding material under any environmental light. In other words, the device of the present invention can accurately measure light transmittance without being affected by environmental light.

Further, the standard deviation serving as a reference for measurement accuracy is within 2%, which is sufficient for practical use.

Next, using the device of the present invention, the measurement time required per 1 (M) sample to be inspected is compared with the conventional manual labor time as shown in Table 2 below.
Shown below.

(Leaving space below) Table 2 As can be seen from Table 2 above, when using the device of the present invention, it is possible to perform measurements in 176 hours compared to conventional manual work, and when the measurement is performed multiple times (with 5rZiJ), the measurement time is less than /9. Reno XJL is remarkable.

The total mass of the prototype device of the present invention is 4.0 kg, making it portable.

As described in detail above, the device according to the present invention is compact, and can automatically measure while confirming the measurement area of the sample tape without using a light shielding material even under various environmental light conditions. It is possible to evaluate the degree of powdering at the production site more easily than before.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the evaluation device according to the present invention, Fig. 2 is a graph showing the relationship between light transmittance and amount of powder falling off, Fig. 3 is a graph showing the frequency spectrum of another patent, and Fig. 4 is a graph showing the relationship between the wavelength and the amount of powder falling off. A graph showing the relationship between light transmittance and Figure 5 is a graph showing the relationship between the wavelength and intensity of the spectrum of direct sunlight.
The figure is a schematic diagram of a conventional evaluation device. l... Adhesive transparent tape unwinding reel 2... Adhesive transparent tape take-up reel 3... Tape pressure bonding roll 5... Material to be inspected 6...
Infrared light emitter 6a... Lens 6h... Infrared light emitting diode 7... Infrared light receiver 7a... Light receiving element 9... Tape holding plate 1o... Adhesive transparent tape patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Noboru Kono Light transmission speed (Z) Calculation 211m 26 Ribhi attack 1 Calculation 3 Kutake mushroom 4 diagram Photo 52 Fuki 6 diagram

Claims (1)

[Claims] 1. After adhesively pressing a transparent tape with adhesive force onto a surface-treated plate that has been subjected to a molding process, the transparent tape is peeled off, and light is transmitted through the transparent tape to which the surface coating powder has adhered. In the method of evaluating the state of surface coating powder flakes during the molding process of surface-treated plates by measuring light transmittance, infrared light whose emission intensity is modulated at a constant period is transmitted. and measuring the infrared light transmittance. 2. The method for evaluating a surface treated plate according to claim 1, wherein the wavelength of the infrared light is 700 to 2500 nm. 3. In an apparatus for evaluating the state of surface coating powder falling off during molding of a surface-treated board, a reel supplies a transparent tape with adhesive strength, a reel winds up the transparent tape, and a molding process is performed between the reels. A press machine that presses and adheres the transparent tape to the processed test material, and a projection that irradiates the transparent tape with infrared light whose emission intensity is modulated at a constant cycle on the downstream side of the press machine. a light section; a measuring device that measures the transmittance of the infrared light to the transparent tape;
1. An evaluation device for a surface-treated board, comprising: an evaluation device for evaluating the state of powder falling off based on the measured value of the measuring device. 4. The evaluation device for a surface treated plate according to claim 3, wherein the wavelength of the infrared light is 700 to 2500 nm.