JPH05280962A - Plate material thickness measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a plate material thickness measuring apparatus which can correctly measure thickness continuously and stably without contacting the plate material even if there is irregular unevenness on a surface of the plate material and resistivity of the plate material is not constant. CONSTITUTION:A pair of a movable head 2 and a fixed head 3 are placed oppositely so that their respective end faces 21, 31 face each other. The fixed head 3 is fixed to a frame 1, while the movable head 2 is supported by the frame 1 so that it can freely slide in the above mentioned facing direction. Compressed fluid jet ports 22, 32 are opened on the respective end faces of the fixed head 3 and the movable head 2, while a compressed fluid supply means 4 is connected to the jet ports 22, 32 and a slide distance detector 5 of the movable head 2 is provided on the frame 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate material thickness measuring device, and more particularly to irregular surface irregularities (surface roughness).
The present invention relates to an apparatus particularly suitable for measuring the thickness of a certain material, for example, a sheet material provided with a fluffy coating 91.

[0002]

2. Description of the Related Art Conventionally, the following means has been known as a means for measuring the thickness of a plate without contacting it.

First, as shown in FIG. 5, there is a method of arranging a pair of eddy current sensors A so as to face each other in the plate thickness method for measurement. However, this measuring method allows accurate measurement only when the plate material 9 has a uniform resistivity and is a conductor. Therefore, on the body of the plate material 9 which is a conductor, a film 91 (especially an insulator) having a non-uniform thickness
The thickness of the entire plate material 9 cannot be accurately measured when the plate material 9 is applied or when the entire plate material 9 is made of an insulator. In particular, it is difficult to adopt it for continuously measuring the materials provided with various coatings 91.

Secondly, as shown in FIG. 6, there is a method in which the upper and lower sides of the plate member 9 are sandwiched by the laser sensor B and measured. According to this method, unlike the case of using the eddy current sensor A, the thickness can be measured with high accuracy regardless of the resistivity of the plate member 9. However, according to this method, not only is the apparatus as a whole expensive, but also the measurement is performed in spots. Therefore, if the surface of the plate material 9 has irregular irregularities (surface roughness), it may vary depending on the measurement position. Is the peak of the surface of the plate 9 (the uppermost point on the surface of the plate 9) and the peak (the plate 9
The distance between the bottom (the lowermost point on the back surface of the plate material 9) and the valley (the lowermost point on the surface of the plate material 9) and the valley (the uppermost point on the back surface of the plate material 9) There is a drawback in that the measured values are likely to vary because of being measured.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to contact a plate material with continuous and stable thickness measurement even if the surface of the plate material has irregular irregularities and the resistivity of the plate material is not constant. The point is to provide a device that can be accurately performed without performing.

[0006]

In order to achieve the above object, the present invention provides a plate material thickness measuring apparatus, which comprises a pair of fixed head and movable head which are provided so as to face each other so that their end faces face each other. The fixed head is fixed to a frame body, the movable head is slidably supported in the opposite direction by the frame body, and the fixed head and the movable head each have a corresponding fluid on their end surfaces. The jet port is opened, the compressed fluid supply means is connected to the jet port, and the frame is provided with a sliding distance detector of the movable head.

[0007]

First, the movable head is slid to the opposite side of the fixed head, and a block gauge (not shown) (preferably having a thickness substantially equal to the plate material to be measured) is fixed to the end surface of the movable head. Insert it in the gap between the head end face,
The movable head is gently moved without supplying compressed fluid to bring the both end surfaces into contact with the block gauge. Then, the measured distance conversion value X0 of the sliding distance detector output at this time is used as a basic value.

Secondly, as in the above, an actual plate member is inserted between the both end faces, and the movable head is gently moved without supplying a compressed fluid to bring the both end faces into contact with the plate member. Then, the measured distance conversion value X of the output of the sliding distance detector at this time
Ask for 1.

Thirdly, from this state, the compressed fluid supply means is operated to inject the compressed fluid of a constant pressure toward the plate material through the compressed fluid ejection ports of the movable head and the fixed head. In this way, the plate member receives the force of the compressed fluid and is separated from the fixed head end face by a small gap as shown in FIG. 3, and the plate member and the fixed head end face are not in contact with each other. On the other hand, similarly, the compressed fluid having a constant pressure ejected from the movable head tries to push the plate material toward the fixed head. At the same time, the movable head is separated from the plate material by a slight gap due to the reaction of the force exerted by the compressed fluid on the plate material, and the plate material and the end surface of the movable head are also not in contact with each other. In these two non-contact states, the plate material has less frictional resistance in the feeding direction than when it is placed on the material guide, and therefore can move more freely. Here, the measured distance conversion value X2 of the output of the sliding distance detector in the both non-contact state is obtained,
The difference d = (X2-X1) is calculated. This difference d is nothing but the total of the gaps generated on both sides of the plate material by injecting the compressed fluid into the plate material from both sides thereof. And this difference d
Is always constant if the material of the plate and the pressure of the compressed fluid are constant.

Fourth, while maintaining the both non-contact states,
The plate material is actually moved in the feed direction to obtain the measured distance conversion value Xt of the output of the sliding distance detector, the value L = (Xt-d) is continuously calculated, and this value L is used as the plate material thickness. Is.
Moreover, in the above both non-contact state, when the plate material has fine unevenness, the compressed fluid enters the concave portion and is pushed out from the convex portion, so that there is an effect of averaging the thickness of the plate material to some extent as a whole, It is possible to perform stable thickness measurement without variation without setting the distance between the peaks of the material surface or the distance between the valleys of the material surface as the thickness of the plate material as in the above-mentioned conventional technique. ..

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the frame 1 includes a lower frame 1b having a pair of material guides 14 and 14 on the upper surface, which are oriented in the feeding direction of the plate material 9 (direction perpendicular to the paper surface of FIG. 2). The lower frame 1b is composed of a gate-shaped upper frame 1a whose lower ends are fixed on both sides. The cylindrical fixed head 3 is inserted and fixed in the fixed head insertion hole 1c provided in the center of the lower frame 1b.
In this state, the upper surface of the material guide 14 and the fixed head end surface 31 are flush with each other, or the upper surfaces of the material guides 14, 14 are located below the fixed head end surface 31. This material guide 14 may be formed by fixing two long plate members in parallel to the lower frame 1b, or by forming a wide material guide 14 with a hole that does not come into contact with the fixed head end surface 31. You may. A pipe line 33 is provided in the axial direction of the fixed head 3 (vertical direction in FIG. 2), and the upper end portion of the pipe line 33 has the pipe line 33.
The nozzle has a diameter smaller than 3, and the tip thereof serves as the compressed fluid ejection port 32. Further, the lower end of the pipe line 33 is connected to the compressed fluid supply pipe 41 by a connection plug 42, so that the compressed fluid can be supplied from the compressed fluid supply means 4 (not shown) to the compressed fluid ejection port 32. Note that, in FIG. 2, the arrow indicates the compressed fluid supply direction. Compressed air is usually suitable as the compressed fluid. Incidentally, according to an experiment by the present inventor, a 0.5 mm thick diatom steel sheet (0.470-
There is a deviation of about 0.520 mm) and the plate material 9 is 4 kg.
When compressed air of f / cm ² was supplied to the apparatus shown in FIG. 1, the total d of the gaps generated on both sides of the plate material 9 was 0.
It became about 07 mm. Further, in this example, the pressure of the compressed fluid supplied to the movable head 2 side and the fixed head 3 side is the same, but the pressure of the compressed fluid supplied to the fixed head 3 side is slightly increased, for example. There is no problem even if the pressures of the compressed fluids supplied to the side and the fixed head 3 side are made different.

A bearing insertion hole 1d is formed coaxially with the fixed head 3 in the upper frame 1a, and a bearing 11 is fitted in the bearing insertion hole 1d. And the bearing 11
The middle part of the movable head 2 having a substantially cylindrical shape is slidably fitted into the. The lower end of the movable head 2 is a movable head end surface 21 that is formed so as to overlap the fixed head end surface 31. The movable head end surface 21 has a compressed fluid ejection port 32 when the movable head 2 is fitted in the bearing 11. A matching compressed fluid jet 22 is provided. The movable head end surface 21 and the fixed head end surface 31 have high flatness and are finished smoothly. As in the case of the fixed head 3, the pipe 23, the connection plug 42, and the compressed fluid supply pipe 41 are connected in this order above the compressed fluid ejection port 22 via a small-diameter nozzle, and the compressed fluid is supplied from the compressed fluid supply means 4. The compressed fluid ejection port 22 is formed so that it can be supplied. In addition, the movable head 2
A collar portion 24 is fixed coaxially with the pipe line 23 above the pipe 23, and a horizontal position holding rod 7 is inserted into an insertion hole 242 provided on the outer peripheral side of the collar portion 24. The lower surface of 71 contacts the upper surface of the collar portion 24. The lower part of the horizontal position holding rod 7 is the bearing 12 fitted to the upper frame 1a.
Is slidably inserted into the. Therefore, the movable head 2
Can move up and down with respect to the frame 1 and the fixed head 3, but the collar portion 24 and the movable head 2 do not rotate in a horizontal plane.

As shown in FIG. 1, which is a front view of FIG. 2, a detection surface 241 is formed on the lower surface on the outer peripheral side of the collar portion 24. The detection surface 241 is the movable head end surface 21 and the fixed head end surface 3
Finish as in 1. Then, the sliding distance detector 5 is fixed to the upper frame 1a so as to face the detection surface 241. Suitable examples of the sliding distance detector 5 include an eddy current sensor and a laser sensor, but the sliding distance detector 5 is not limited to these, and other known distance sensors may be used. It doesn't matter. Here, when an eddy current sensor is adopted as the sliding distance detector 5, the detection surface 241 is made of a material having a known and uniform resistivity such as SS41. On the other hand, when a laser sensor is used as the sliding distance detector 5, it is not necessary to pay attention to the resistivity. The signal of the sliding distance detector 5 is taken into an AD converter and a computer (not shown) and a computer electrically connected to the signal via a signal line 51 to be processed. The air cylinder 13 fixed to the upper frame 1a is used when the movable head 2 as a whole is separated from the upper frame 1a.

FIG. 4 shows a state in which the plate thickness measuring device is applied to a press machine. Uncoiler 81 to plate 9
The plate material thickness measuring device is positioned in the middle of supplying the sheet material to the press machine 84, and the guides 83, 83 and the material confirmation sensor 8 are arranged in front of and behind the plate material 9 in the feeding direction of the measuring device.
2, 82 are arranged.

In the above-described embodiment, the fixed head 3 and the movable head 2 are provided so as to face each other in the vertical direction. However, the plate thickness direction of the plate material 9 is oriented in the horizontal direction and the fixed head 3 and the movable head 2 are arranged. The respective axes may be opposed to each other in the left-right direction. When the movable head 2 is moved in the left-right direction as described above, the self-weight of the movable head 2 does not act in the direction of canceling the force of the compressed fluid. Therefore, a means for pressing the movable head 2 toward the fixed head 3 side, for example, a spring (not shown) is provided. good. In the figure, reference numeral 15 is a roller bearing, 16 is a shaft, 17 is a connecting rod, and 91 is a film.

Of course, the present invention is not limited to the above-mentioned embodiments, but various modifications can be made as necessary without departing from the scope of the invention.

[0018]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, continuous and stable thickness measurement can be performed on a plate material even if the surface of the plate material has irregular irregularities and the resistivity of the plate material is not constant. There is an effect that it is possible to obtain a device that can be accurately performed without contact.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a plate material thickness measuring device according to an embodiment of the present invention.

2 is a partially cutaway front view of FIG. 1. FIG.

FIG. 3 is an enlarged vertical sectional view showing a state where a plate member is sandwiched between a movable head and a fixed head.

FIG. 4 is a schematic view showing a state where the plate material thickness measuring device of the present invention is applied to a press working machine.

FIG. 5 is a schematic view showing a conventional plate thickness measuring method using an eddy current sensor.

FIG. 6 is a schematic view showing a conventional plate thickness measuring method using a laser sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Movable head 21 Movable head end face 22 Compressed fluid ejection port 3 Fixed head 31 Fixed head end face 32 Compressed fluid ejection port 4 Compressed fluid supply means 5 Sliding distance detector

Claims (1)

[Claims] 1. A pair of fixed heads and a movable head are provided so as to face each other so that their end surfaces face each other, the fixed head is fixed to a frame, and the movable head is slid in the facing direction. Compliantly supported by the frame body, at the end faces of the fixed head and the movable head, corresponding compressed fluid injection ports are opened, and compressed fluid supply means is connected to the injection ports. A plate material thickness measuring device characterized in that a frame is provided with a sliding distance detector of the movable head.