JPH06102171A - Measuring instrument for parameter of coated - Google Patents

Abstract

PURPOSE:To obtain an instrument for measuring parameters of coated films which can accurately measure the bond strength and shear strength of a coated film. CONSTITUTION:The title instrument is provided with a displacement measuring means 34, etc., which measures the distance between the stripped-off end 6C of a coated film 6A stripped off when the film 6A is cut off with a cutting blade 8 and the front end of the blade 8, etc., and finds the vertical distance from the surface of a coated plate 6 to the point at which the blade 8 comes into contact with the stripped-off end 6C of the film 6A and the horizontal distance from the stripped-off end 6C to the above-mentioned point. The instrument finds the bond strength of the film 6A from the vertical and horizontal distances as a strain energy release ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film parameter measuring device for accurately measuring the adhesion strength and shear strength of a coating film as coating film parameters.

[0002]

2. Description of the Related Art FIG. 5 shows the conventional coating film adhesion strength and shear strength disclosed in Japanese Patent Application No. 3-67151 (invention title "coating adhesion strength and shear strength measuring device"). It is a front explanatory view showing a coating film parameter measuring device with a partial block diagram. In the figure, the abutment 36 is provided with a fixing member, that is, a magnet 58, and the coated plate 5 which is the subject.
7, the guide member, that is, the guide shaft 37 is fixed to the magnet 58 via the abutment 36. A pressure detector 39 and a guide shaft 40 are fixed to the moving member, that is, the sliding member 38, and a sliding member 41 is attached to the guide shaft 40.
Is mounted on one end of the sliding member 41.
A connecting member 67 and a threaded connecting rod 64 are fixed to the other end, and the receiving member 4 can be fixed to the connecting rod 64 at an arbitrary position.
3 is screwed in. A threaded rod 45 is screwed into the nut 44 connected to the sliding member 38, and one end thereof is connected to the motor 46. The sliding member 38 is linearly displaceable along the guide shaft 37 in parallel with the measurement surface of the coating plate 57 (that is, right and left in the drawing). When the sliding member 48 moves left and right in conjunction with the sliding member 38, the cutting blade 50 fixed to the cutting blade support 42 also moves left and right. By driving the motor 46, the pressure detector 39 fixed to the sliding member 38 moves linearly along the guide shaft 37.

The pressure detector 39 includes a pressure sensing member 39A.
Is provided so as to project, and the pressure sensing member 39A pushes the receiving tool 43 to the right toward the drawing. Since the receiver 43 is fixed to the sliding member 41 via the connecting rod 64, the sliding member 41 moves rightward in the drawing. The guide shaft 40 keeps the sliding member 41 parallel to the measurement surface of the coating plate 57, and at the same time, detects the horizontal component force generated in the cutting edge 50 by the pressure sensing member 39.
Play the role of telling A. That is, since the pressure detector 39 is fixed to the guide shaft 40 and the sliding member 38 and moves together, the sliding frictional force between the guide shaft 40 and the sliding member 41 is not applied, and only the horizontal component force of the cutting blade 50 is applied. It will be transmitted to the pressure sensing unit 39A. The force acting on the pressure sensing member 39A is detected by the pressure detector 39.

Next, regarding the movement of the cutting blade 50 perpendicular to the measuring surface of the coating plate 57, Japanese Patent Laid-Open No. 61-
Although described in Japanese Patent No. 169745, it will be briefly described. A guide shaft 49 is attached to the sliding member 48 so as to slide vertically. A cutting edge 50 is provided at one end of the guide shaft 49.
Is provided with a supporting body 42, and a threaded rod 52 into which an adjusting screw 51 with a knob that serves as a pressing force adjusting means is screwed is fixed to the other end. A guide shaft 53 is fixed to the end of the threaded rod 52, and a sliding member 54 is attached to the guide shaft 53. The pressure detector 56 supported by the pressure detector support base 55 fixed to the first connecting member 67 is a guide shaft 49,
The repulsive force generated in the cutting blade 50 via the threaded rod 52 and the guide shaft 53 in the direction perpendicular to the measurement surface of the coating plate 57 (that is, upward in the drawing) is detected. The pressing force of the cutting blade 50 against the measurement surface of the coating plate 57 is adjusted while observing the detected value. That is, the spring 63 is provided between the knob-adjusting screw 51 and the sliding member 54, and the knob-adjusting screw 5 is provided.
At 1, the pressing force of the coating plate 57 of the cutting blade 50 is adjusted and set.

A sliding member 4 connected to the guide shaft 49 is also provided.
A guide shaft 68 is rotatably mounted on the shaft 7, and a cutting blade support 42 is fixed to one end of the guide shaft 68.
The sliding member 47 and the guide shaft 68 form a pressing contact angle adjusting means, and the guide shaft 68 is rotated so that the tip of the cutting blade 50 is brought into close contact with the coating film surface of the coating plate 57.

A vertical displacement detector fixed to the pressure detector 56, that is, a differential transformer 65 detects the movement of a rod 66 connected to the end portion of the guide shaft 53, and the measurement surface of the coating plate 57 of the cutting blade 50 is detected. The amount of vertical displacement, that is, the displacement of the cutting edge 50 in the depth direction is detected.

The data measured by the pressure detector 39 and the differential transformer 65 are AD-converted by the AD converter 59, for example, arithmetically processed by the 16-bit CPU 60 and stored in the external storage device 61. The data stored in the external storage device 61 is input to a personal computer, the adhesive strength or shear strength is calculated by a calculation program, and the waveform processing is performed by a Fourier transform program, and a graph of a Fourier spectrum, a power spectrum, and an autocorrelation function is output. .

With the above construction, as the coating plate 57, for example, a pillar of an iron bridge coated on an iron column having a width of 30 cm and a length of 10 m is used, and the iron column is magnetized by the magnet 58 so that the cutting blade 50 is located at a part of the coating film. Fix on top. Blade width 4mm,
The cutting edge 50 having a rake angle of 20 ° is applied to the coating film surface of the coating plate 57, and the adjustment screw 51 with knob is pressed so that a force of 500 g is applied to the coating plate 57.

By the way, the relationship between the rake angle of the cutting edge 50 and the vector at zero load can be obtained from the following equation from the relationship of force balance.

F _c = λA ₀ (1 + cotφ) ... (1) F _r = λA ₀ (cotφ-1) ... (2)

Here, λ is the shear strength (Kg / cm) of the coating film.
² ), A ₀ is the cutting area (cm ² ) and φ is the shear angle.

When the load is zero, in equation (2), co
If tφ> 1, F _r > 0 and the cutting edge is pushed up, and if cotφ <1, F _r <0 and the cutting edge bites. Therefore, if cotφ = 1 is set (the value of φ changes depending on the rake angle α of the cutting edge), the cutting edge 50 does not move up and down during cutting and can be stopped at a predetermined depth. Since this relationship is slightly different depending on the material to be cut, it is necessary to adjust the pressing load to bring F _r to zero.

When the motor 46 is driven to move the cutting blade 50 at a speed of 100 μm / min while pressing the cutting blade 50 against the coating film surface with 500 g, the cutting blade 50 is cut into the coating film. If the pressing pressure load is adjusted during cutting, the cutting blade will not move up and down in balance at that position as described above. For example, if the load is adjusted at the position where the cutting edge reaches the interlayer part, the layer moves in a balanced manner, and if the load is adjusted at the position where the cutting edge reaches the interface part, the balance moves the interface part. Become. In the case of a multilayer film, the surface of the next layer appears by the measurement of the first layer, so it may be measured in the same manner as above, and the lower layers can be measured sequentially from the surface layer, so the physical properties of each layer in the multilayer coating film can be easily measured You can do it.

[0014]

However, since the conventional coating film parameter measuring device is configured as described above and uses the horizontal component force value as the value of the adhesion strength of the coating film, the same adhesion strength is obtained. However, there has been a problem that the measurement accuracy is deteriorated such that the measured values differ due to changes in film thickness and hardness.

Further, in the calculation of the shear strength, there is a problem that the shear angle becomes unclear and the accuracy becomes poor because the shear angle is not clear.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a coating film parameter measuring apparatus capable of accurately measuring the coating film adhesion strength and shear strength.

[0017]

A coating film parameter measuring device according to claim 1 of the present invention is a displacement for measuring a distance between a coating film peeled when a coating film is cut by a cutting blade and a tip of the cutting blade. A measuring means is provided, and based on the value measured by this displacement measuring means, the vertical height from the coating plate surface to the contact point where the peeled coating film contacts the cutting edge, and from the tip of the peeled coating film. The horizontal length to the contact point is obtained, and the coating film adhesion strength is obtained as a strain energy release rate from the vertical height and the horizontal length.

In the coating film parameter measuring device according to the second aspect of the present invention, when the coating film is cut by the cutting blade, the vertical distance from the peeled coating film surface to the rake face of the cutting blade is defined as the chip thickness. Provided with a chip thickness measuring means to measure as, cutting depth measuring means to measure the cutting depth of the cutting blade to the coating plate, to obtain the shear angle from these chip thickness and cutting depth, The shear strength is obtained from the shear angle.

[0019]

In the coating film parameter measuring device according to the first aspect of the present invention, the value of the adhesion strength can be obtained as the strain energy release rate by measuring the distance between the peeled coating film and the tip of the cutting edge.

In the coating film parameter measuring device according to the second aspect of the present invention, it is possible to obtain the shear angle by measuring the chip thickness.

[0021]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a coating film parameter measuring device (hereinafter, simply referred to as a device) according to the first embodiment. In FIG. 1, a guide shaft 2 is fixed to a support member 1, a slide member 3 is pivotally attached to the guide shaft 2, and a slide member 4 is attached to the slide member 3.
The sample mounting base 34 is fixed to the sliding member 4, and the coating plate 6 which is the subject of the coated material to be the sample is mounted on the sample mounting base 24. A threaded rod 27 is screwed into the nut 26 coupled to the sliding member 3, and one end of the threaded rod 27 is coupled to the motor 25. The sliding member 3 is horizontally displaceable along the guide shaft 2. The pressure detector 5 is fixed to the sliding member 3 and is attached to the pressure detector 5.
Fixture 69 fixed to the sliding member 4 by the detection part of
Press on.

The moving member 21 is fixed to the supporting member 1 via the connecting member 22, and can be moved up and down by the rotation of the knob 23. The sliding member 11 is mounted on a guide shaft 12 fixed to the moving member 21. The cutting blade support 10 is fixed to the sliding member 11. The cutting blade 8 is fixed to one end of the cutting blade support 10 and the pressure detector 9 is fixed to the other end. The guide shaft 16 is fixed to the connecting member 19 fixed to the moving member 21, and the sliding member 17 slides on the guide shaft 16. The nut 14 is fixed to the sliding member 17, and the threaded rod 15 is screwed in. The threaded rod 15 is connected to a stepping motor 20 fixed to the connecting member 19. Spring 1
A pressure detector 9 is attached to one end of the blade 3 and a nut 14 is attached to the other end of the blade 3 to adjust and set the pressing force of the cutting blade 8 against the coating plate 6.

The film thickness meter 18 is fixed to the moving member 21 and measures the amount of displacement of the cutting blade support 10. The film thickness meter 7 is fixed to the sliding member 4 and measures the amount of displacement of the coating plate 6. The differential transformer amplifier 28 amplifies the difference between the output signals of the film thickness meters 7 and 18. Further, 29 is a load cell amplifier connected to the load cell (see FIG. 4), and 30 is a stepping motor 20.
For controller, 31 is C as display
RTs and 32 are personal computers.

FIG. 2 is a front view for measuring the peeling length of the coating film. In FIG. 2, 6A is a coating film, 6B is a substrate, and 6C is a peeled coating film. The differential transformer 34 is fixed to the handle portion of the cutting blade 8 by the connecting rod 33. A contactor 35 is fixed to the tip of the differential transformer 34 so as to coincide with the tip of the cutting blade 8, and is set at an angle of 55 ° with the coating plate 6.

FIG. 3 is a contact point at which the peeled coating film comes in contact with the cutting blade from the surface of the coated plate, based on the distance between the coating film peeled when cutting the coating film with the cutting blade and the tip of the cutting blade. FIG. 4 is an explanatory diagram for obtaining a vertical height up to and a horizontal length from the tip of the peeled coating film to the contact point. In the figure, CD is the vertical height (a) from the surface of the coated plate to the contact point where the peeled coating comes into contact with the cutting edge, and BD is the peeling length from the tip of the peeled coating to the above. The horizontal length to the contact point (b), AX is the distance (h = h'-d) between the coating film peeled off when cutting the coating film with the cutting blade and the tip of the cutting blade.
(A)), and L = AO, α = 70
When β and β = 55 °, the following formula is established. Here, h'is a measured value of the differential transformer 34, and the tip of the cutting blade 8 is set as a zero point. d is the thickness of the adherend (coating film), and the difference between the film thickness meter 18 and the film thickness meter 7, that is, the cutting depth is used in consideration of the deformation of the coated plate. Further, the lower surface BC of the peeled coating film has an arc.

AB = Lcosβ, AD = (Lcosβ)
From cos α, BD = b = AB + AD = L cos β + L
cosβ cosα,

H = L-Lsinβ L = h / (1-sinβ) (B)

CD = a = ACsinα AC = cosβ × L = cosβh / (1-sinβ)

Then, the vertical height CD to the contact point where the coating film peeled from the surface of the coated plate comes into contact with the cutting edge.
(A) The peeling length, the horizontal length BD from the tip of the peeled coating film to the contact point, is the distance between the peeled coating film and the tip of the cutting blade when the coating film is cut by the cutting blade. The distance h is calculated from the measured values of h ′ and d by the equation (A), and is substituted into the equation (B) to obtain L, and this L is substituted into the equations (3) and (4).

BD = Lcosβ + Lcosβcosα (3) CD = sinαcosβh / (1-sinβ) (4)

By substituting the above values into the strain energy release rate equation (5), the adhesion energy can be obtained as the coating film adhesion strength.

G = 3ED ³ U ² / [8a ⁴ {1+ (0.64D / b)}] ⁴ (5) where E is the elastic modulus, D is the film thickness (thickness of the adherend) d, U
Is CD = a and b is BD.

In the measurement of the shear angle, the attachment angle of the differential transformer 34 with respect to the connecting rod 33 is changed to change the contact 3
The angle formed by the coating film surface is set to 20 ° so that 5 is perpendicular to the cutting edge rake surface. Then, the chip thickness t ₂ of the coating film 6 produced by cutting with the cutting blade 8 is measured, and the shear angle is calculated by the formula (6). The chip thickness t ₂ is a measured value of the differential transformer 34 with the mounting angle changed.

R _c = t ₁ / t ₂ (6) Here, t ₁ is the cutting depth (d).

Φ = tan ⁻¹ {r _c cos α / (1-r _c sin α)} (7) where φ is the shear angle and α is the rake angle of the cutting edge.

Thus, if the shear angle φ is obtained, the shear strength λ is

Λ = F _C / (2A ₀ cotφ) (8)

Is obtained as The cutting depth d of the coating film by the cutting blade is measured by the differential transformer 1 fixed to the moving member 21 that detects the displacement of the cutting blade support 10 as described above.
From the measured value of 8, the measured value of the differential transformer 7 fixed to the sliding member 4 for detecting the displacement of the coated material is amplified by the amplifier 28.
The cutting depth of the cutting blade 8 into the coating film can be obtained by subtracting with the differential transformer 7, 18 and the amplifier 28 constituting the cutting depth measuring means according to claim 2 and the cutting depth. Measuring means and differential transformer 34
Constitutes the displacement measuring means of claim 1. The differential transformer 34 constitutes the chip thickness measuring means of claim 2.

The pressure detector 9, the pressure detector 5, and the measurement data of the cutting depth are AD-converted by the AD converter 32 and input to the personal computer 31, and data analysis is performed by calculation processing.

Further, in the first embodiment, the balance load is automatically set by setting the depth of cut, that is, the displacement by the displacement setter 70 as shown in the mechanism in FIG. 4, and setting this signal by the displacement balance operation mode setting. Processing by the device 71, and based on the processed signal, the stepping motor controller 30
Drive the stepping motor 20 via the driver 73. The displacement balance operation mode setter 71 uses the signal from the load cell R75, the differential transformer amplifier 28,
Displacement sensor 7 obtained via displacement analog output device 78
The displacement signal from 6 is taken in, and these are set by the displacement setter 7
Compare with the set displacement signal from 0. The displacement sensor 76 is composed of the film thickness meters 7 and 18, as described above. With this mechanism, the pressing load is controlled so as not to deviate from the displacement set value. Then, by feeding back the cutting depth data to the stepping motor 20 which is a pushing pressure load adjusting motor through the control mechanism, the cutting edge 8 is automatically set to the set depth in the interface portion and the coating film. Can be controlled. The displacement setting device 70 and the displacement equilibrium operation mode setting device 71 are the CRT3.
1, PC32 and the like.

If an acoustic emission sensor (not shown) is fixed to the handle portion of the cutting blade 8 in order to detect the cracking state during cutting of the coating film, the cracking state of the coating film due to the cutting blade can be observed.

[0042]

As is apparent from the above description, according to the coating film parameter measuring device of the first aspect of the present invention,
Provided with a displacement measuring means for measuring the distance between the coating film peeled when cutting the coating film with the cutting blade and the tip of the cutting blade, based on the measurement value by this displacement measuring means, peeled from the coated plate surface The vertical height to the contact point where the coating film contacts the cutting edge and the horizontal length from the tip of the peeled coating film to the contact point are determined, and the vertical height and the horizontal length are used for coating. Since the film adhesion strength is obtained as the strain energy release rate, the adhesion strength can be obtained as the strain energy release rate, and the adhesion strength can be obtained accurately.

Further, according to the coating film parameter measuring apparatus of the second aspect of the present invention, when the coating film is cut by the cutting blade, the vertical distance from the peeled coating film surface to the rake face of the cutting blade is measured. A chip thickness measuring means for measuring the chip thickness and a cutting depth measuring means for measuring the cutting depth of the cutting blade into the coating plate are provided, and the shear angle is calculated from the chip thickness and the cutting depth. Since the shear strength is calculated from this shear angle, the shear strength can be accurately calculated.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing a first embodiment of the present invention.

FIG. 2 is a front view for explaining measurement of a coating film peeling length in Example 1.

FIG. 3 is an explanatory diagram for explaining calculation of a coating film peeling length in Example 1.

FIG. 4 is a diagram showing a balance load automatic setting mechanism according to the first embodiment.

FIG. 5 is a front view showing a conventional coating film parameter measuring device.

[Explanation of symbols]

 6 Coating plate 6A Coating film 7,18 Film thickness meter 8 Cutting edge 5 Pressure detector 18 Differential transformer 20,25 Motor 34 Differential transformer

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[Procedure amendment]

[Submission date] December 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

In the coating film parameter measuring device according to the second aspect of the present invention, when the coating film is cut by the cutting blade, the vertical distance from the cut coating film surface to the rake face of the cutting blade is defined as the chip thickness. Provided with a chip thickness measuring means to measure as, cutting depth measuring means to measure the cutting depth of the cutting blade to the coating plate, to obtain the shear angle from these chip thickness and cutting depth, The shear strength is obtained from the shear angle.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

[0021]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a coating film parameter measuring device (hereinafter, simply referred to as a device) according to the first embodiment. In FIG. 1, a guide shaft 2 is fixed to a support member 1, a slide member 3 is pivotally attached to the guide shaft 2, and a slide member 4 is attached to the slide member 3.
The sample mounting base 4 is fixed to the sliding member 4, and the coating plate 6 which is the subject of the coated material serving as the sample is mounted on the sample mounting base 4 . A threaded rod 27 is screwed into the nut 26 coupled to the sliding member 3, and one end of the threaded rod 27 is coupled to the motor 25. The sliding member 3 is horizontally displaceable along the guide shaft 2. The pressure detector 5 is fixed to the sliding member 3 and the fixture 69 fixed to the sliding member 4 is pressed by the detection portion of the pressure detector 5.

Claims (2)

[Claims] 1. A coating film parameter measuring device for measuring the adhesion strength of a coating film by cutting the coating film adhered to a coated plate with a cutting blade, wherein the coating film is peeled off when the coating film is cut with the cutting blade. Displacement measuring means for measuring the distance between the cutting edge and the tip of the cutting blade, based on the measured value by this displacement measuring means, the vertical to the contact point where the coating film peeled from the surface of the coating plate contacts the cutting edge The direction height and the horizontal length from the tip of the peeled coating film to the contact point are obtained, and the coating film adhesion strength is obtained as the strain energy release rate from these vertical height and horizontal length. A coating film parameter measuring device characterized by: 2. A coating film parameter measuring device for measuring the shear strength of a coating film by cutting the coating film adhered to a coated plate with a cutting blade, wherein the coating peeled off when cutting the coating film with the cutting blade. A chip thickness measuring means for measuring the vertical distance from the film surface to the rake face of the cutting edge as the chip thickness, and a cutting depth measuring means for measuring the cutting depth of the cutting blade on the coating plate. A coating film parameter measuring device, characterized in that a shear angle is determined from the chip thickness and the cutting depth, and the shear strength is determined from this shear angle.