JPS63212839A - Apparatus for measuring young's modulus of plate material - Google Patents

Abstract

PURPOSE:To accurately measure the Young's modulus of a plate material without being affected by the initial strain thereof, by applying predetermined low and high loads to the plate material and catching the load and bending quantity between both of them to measure the Young's modulus of the plate material. CONSTITUTION:A control part 20 reads preset low and high load values W1, W2 from a load setting means 23 and a pressurizing apparatus 13 is driven by a pressurization order means 21 to start the bending loading of a plate material 11. Then, the lower rank load value of bending load W is inputted and, when said value reaches a low load value W1, the load value W1 and bending quantity Y1 of the plate material 11 at this time are stored in a memory means 27. Subsequently, the higher tank load value of the bending load W is inputted and, when said value reaches the high load value W2, the load value W2 and bending quantity Y2 of the plate material 11 are stored in the memory means 27. When said load values W1, W2 and bending quantities Y1, Y2 are stored, Young's modulus E is calculated by formula I wherein l is the spaced-apart distance between supports 12, 12, (h) is the thickness of the plate material 11 and (b) is the width of the plate material 11 in the short side direction thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a measuring device for measuring Young's modulus of a board material such as a wooden board.

(Conventional technology) As a conventional technique, there is a technique shown in FIG.

That is, the plate material 1 is placed between two supports 2 and 2 spaced apart from each other.
A pressurizing device 3. is placed on the center of each support 2. Place the weight meter 4 and the deflection meter 5, and first place the plate 1 on each support 2.
・The deflection meter 5 is set to O in the no-load state placed between the two, and then the pressure bag v! 13, a bending load is applied to the plate material 1 until the total weight 4 reaches a predetermined value (W).

In this state, read the value (Y) of the deflection meter 5.

These values (W) and (Y) are expressed as Young's modulus (E) (
7), the Young's modulus of the plate material was obtained by substituting it into the equation rE=WQ3/4bh3YJ.

However, distance: distance between supports 2 and 2 (span) h: plate material 1
Thickness b: Width of the plate material 1 in the short direction (problem to be solved by the invention) In the above conventional method, the value of the amount of deflection (Y) of the plate material 1 is placed on each support 2 and 21tfl. The no-load state is set as 0 point,
Deflection f when a predetermined bending load is applied using this as a base point
Since fi (Y) was obtained by measuring, if the plate 1 has undergone initial deformation such as twisting, the plate 1
may hit the supports 2 and 2 unevenly, and the amount of deflection (Y) against the load (W) becomes inaccurate, and the Young's modulus (E
) had the disadvantage that it could not be measured accurately.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a novel Young's modulus measuring device for plate materials that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is constructed as follows.

That is, a driving means for driving a pressurizing device that applies a bending load to a plate material according to a command from a pressurizing command means, a load measuring means and a deflection measuring means that measure the pressing force of the pressurizing device and the amount of deflection of the plate material. , a weight setting means for setting a low weight value and a high weight value, a comparison means for emitting a storage command signal every time the weight value of the weight measurement means and the weight value of the weight setting means match, and a comparison means for generating a storage signal. a storage means for storing the values of the weight measurement means and the deflection measurement means at each time of each input; a determination means for emitting a calculation signal when the number of times the storage means has stored a predetermined value; and a determination means for inputting the calculation signal. and Young's modulus calculation means for calculating Young's modulus based on the stored value in the storage means.

(Function) Since the present invention has the above configuration, when a bending load is applied to the plate material by the operation of the pressurizing device, this load is applied to the predetermined low weight value and high weight value set in the weight setting means. When the value is reached, the load applied to each plate material and the amount of deflection of the plate material at that time are stored in the storage means.

Then, when the number of times of storage reaches a predetermined value, the Young's modulus calculation means calculates the Young's modulus of the plate material based on the stored value in the storage means.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First of all, in the drawings, Fig. 1 is a block diagram of the measuring device according to the present invention, Fig. 2 is a flowchart thereof, and Fig. 3 is the relationship between the weight value given to the plate material and the amount of deflection when the Young's modulus is calculated. This is a graph showing.

In FIG. 1, numeral 10 indicates a measuring mechanism section, which is constructed as follows.

That is, reference numerals 12 and 12 denote a pair of supports made of rollers spaced apart in the left-right direction, and these supports 12 and 12 support the plate material 11 made of a wooden board, which is a non-measurement object, at both ends thereof.

A pressurizing device 1113 consisting of an air cylinder is suspended and supported by the frame 16, located above the center of each of the supports 12, 12. This pressure device! ! 13 applies pressure to the central portion of the plate material 11 in the longitudinal direction from above.

The above pressure equipment! ! A weight meter 14 is attached to the lower end of 13. This pressure device 14 is a pressure device! The pressurizing device is pressed against the plate material 11 via the pressurizing device 13! ! 13, a signal corresponding to the pressing force or weight is emitted.

Further, a deflection gauge 15 is suspended and supported on the frame 16,
The measuring element 15a on the lower side is still brought into contact with the upper surface of the bracket 14a projecting laterally from the weight meter 14. This deflection meter 15 emits a signal corresponding to the amount of vertical movement of the weight meter 14.

Reference numeral 20 denotes a control section that controls the measurement mechanism section 10, and is configured as follows.

That is, 21 is a pressurization command means, which issues a drive command to the drive means 22 that drives the pressurization device 13 when a start switch (not shown) is turned on.

The drive means 22 is composed of an air pump or a valve provided in the discharge path of the air pump, and when a signal from the pressurization command means 21 is input, it supplies working air to the drive device 13 to cause it to extend and apply pressure. A bending load is applied to the plate material 11 via a total of 14.

23 is a weight setting means for inputting and setting a low weight value W0 and a high weight value W2;

The high weight value W2 is set in advance by the operator in accordance with the bending rigidity due to the plate pressure, width, etc. of the plate material 11. In particular, the low weight value W1 is a load for correcting initial distortion such as twisting of the plate material 11. Set above.

The bending weight value W of the plate material 11 applied by the drive device 13 and the amount of deflection Y of the plate material 11 due to this are detected by the weight measuring means 24 and the deflection measuring means 25 by inputting the signals of the weight meter 14 and the deflection meter 15. do.

Then, the bending weight value W detected by the weight measuring means 24 is
is sent to the comparing means 26 and the storage means 27, and the deflection ff1Y detected by the deflection measuring means 25 is sent to the storage means 27.

The comparison means 26 determines that the weight value W is the weight setting means 23.
A storage command signal is sent to the storage means 27 each time the weight value matches the low weight value W1 and the high weight value W2.

Further, the storage means 27 stores the weight measurement means 24 and the deflection measurement means 25 at that time every time the storage signal is inputted.
, that is, as shown in FIG.
Remember 2.

The number of times stored in the storage means 27 is determined by the determining means 28, and when the number of times stored reaches a predetermined value, the determining means 28 sends a calculation signal to the Young's modulus calculating means 29, and also sends a calculation signal to the canceling means 30. Sends a release signal.

The Young's modulus calculation means inputs the calculation signal and calculates the Young's modulus based on the values stored in the storage means 27, that is, the low weight W The ratio (E) is calculated using the following formula.

"E== (w2 w engineering) A"/4bh' (Y2-Y
(Y)" However, Q: Separation distance (span) between the supports 12, 12 h: Thickness of the plate material 11 b: Width of the plate material 11 in the short direction Further, the above-mentioned release means 30 inputs the above-mentioned release signal and applies pressure. A stop signal is sent to the command means 21, and thereby the pressurization command means 21 sends a release signal to the drive means 22 to release the pressurization operation of the drive device 13.

Next, a flowchart for executing the control section 20 will be explained with reference to FIG. Note that 40 to 51 indicate each step of the flowchart.

If you start at 40, at 41 the low weight value W1 and high weight value W
2 is read, and the pressurizing device 13 is driven at 42 to press the plate material 1.
1 pressure (bending load) is started.

Then, in step 43, input the lower weight value of the bending weight W, and
This weight value is the low weight value W set by the weight setting means 23.
When it becomes □, the weight value W1 and the amount of deflection Y of the plate material 11 at this time are stored in 44 and 45.

Next, in step 44, the upper weight value of the bending weight W is inputted, and this weight value becomes the high weight value W2 set by the weight setting means 23.
Then, in 47 and 48, the weight value W2 and the amount of deflection Y2 of the plate material 11 at this time are stored.

After storing each of the above-mentioned weight values W, W and each deflection amount, Y1 and Y3, the Young's modulus is calculated at 49, the pressure on the plate material 11 by the pressurizing device 13 is released at 50, and each step progresses at 51. complete.

Note that the measuring mechanism section 10 according to the present invention may have a structure shown in FIG. 5.

That is, each of the above-mentioned supports 12, 12 is made into a rotatable rolling roller 12a, 12a, and a pressure roller 17 with an eccentric rotation axis 17a is rotatably connected to the lower part of the weight meter 14.
This pressure roller 17 is brought into contact with the upper surface 11a of the plate material 11.

Further, a deflection meter 15 is disposed below the pressure roller 17, and a measuring roller 15b is rotatably connected to the upper end of the deflection meter 15 and brought into contact with the lower surface 11b of the plate material 11.

Then, the pressure bag [13 is lowered and the pressure roller 17 is
is pressed against the upper surface 11a of the plate material 11 with a predetermined force, for example, a force sufficient to eliminate the initial twist of the plate material 11, and in this state, the plate material 11 is moved to the left as shown in FIG.

In this way, as the plate material 11 is moved as described above, the pressure roller 17 rolls on the upper surface 11a of the plate material 11, and a pressing force corresponding to the eccentricity of the pressure roller 17 is periodically applied as shown in FIG. It will be applied to the plate material 11.

Then, the low weight value W1 of the weight setting means 23 of the control unit 20
and the high weight value W2 are applied to the plate material 1 by the pressure roller 17.
The minimum bending load W of 1 is set to be between the maximum bending load W of 1 and the maximum bending load W of 1.

If the measuring mechanism section 10 is configured as described above, the long plate material 11
The Young's modulus of the plate material 11 can be measured continuously in its longitudinal direction, and the Young's modulus of the plate material 11 can be measured over a wide range.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, predetermined low and high loads are applied to the plate material, and the Young's modulus is measured by capturing the load between these two and the amount of deflection thereof. So,
This has the effect that the Young's modulus of the plate can be accurately measured without being affected by the initial strain of the plate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a measuring device according to the present invention. FIG. 2 is a flowchart, FIG. 3 is a graph showing the relationship between the weight applied to the plate material and the amount of deflection when the Young's modulus is calculated, and FIG. 4 shows another embodiment of the present invention. FIG. 5 is a schematic front view of the measuring mechanism, FIG. 5 is a graph showing the relationship between the load and deflection, and FIG. 6 is an explanatory diagram showing a conventional example. 10: m foot mechanism part, 11: plate material, 12: support body, 13:
Pressure device, 14: Weighted needle, 15: Deflection meter. 20: control unit, 21: pressurization command means, 22: drive means,
23: weight setting means, 24: weight measurement means, 25: deflection measurement means, 26: comparison means, 27: storage means, 28: determination means, 29: Young's modulus calculation means, 30: cancellation means. Application agent: Hisada Matsumoto Figure 3 “W2 411th (W) No. 6
Diagram - Between Ichigamine

Claims (1)

[Claims] 1. A driving means for driving a pressurizing device that applies a bending load to a plate material according to a command from a pressurizing command means; a load measuring means and a deflection measuring means that measure the pressing force of the pressurizing device and the amount of deflection of the plate material; A weight setting means for setting a low weight value and a high weight value, a comparison means for issuing a memory command signal every time the weight value of the weight measuring means and the weight value of the weight setting means match, and inputting a memory signal. a storage means for storing the values of the weight measurement means and the deflection measurement means at that time each time the storage means stores the values, a determination means for emitting a calculation signal when the number of times the storage means has stored a predetermined value; and a determination means for inputting the calculation signal. A Young's modulus measuring device for a plate material, comprising: Young's modulus calculating means for calculating Young's modulus based on a stored value in a storing means.