JPH0786449B2 - Automatic rank ford testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the Rankford value (r
Value) for an automatic Rankford tester.

[Prior Art] The Rankford value (r value) is used to determine the mechanical properties of a metal material such as a thin steel plate. This r value is calculated by the following equation.

However, L ₀ : Distance between gauge marks before pulling test piece L _r : Distance between gauge marks after pulling test piece W ₀ : Width of parallel part of specimen before pulling test piece W _r : Pulling test piece The width of the parallel part of the test piece after that As a test device for automatically measuring such an r value, there is, for example, one disclosed in Japanese Utility Model Publication No. 61-32350.

The outline of the device disclosed in this publication will be described with reference to FIG. 4. The device has a pair of chuck mechanisms 22a and 22b at the test piece pulling position in the main body. Then, the test strip 10 supplied from the test strip supply mechanism (not shown) is gripped at both longitudinal ends by the chuck mechanisms 22a and 22b, respectively.

The gauge length measuring mechanism 50 for the test piece has a chuck 52 at the tip.
Detection member 51 consisting of a pair of plate-shaped measuring pieces having a and 52b
It has a and 51b. Then, these detection members 51
The chuck portions 52a and 52b at the tips of a and 51b are adapted to respectively hold the test piece 10 supplied to the pulling position at the gauge point position.

When the test piece 10 gripped by the chuck mechanisms 22a and 22b is pulled by the driving of the pulling drive mechanism 21, the detection members 51a and 51b respectively fixed to the reference point positions of the test piece 10 also extend the distance between the reference points. According to the above, it is displaced as shown in FIG.

The displacements of the detection members 51a and 51b are transmitted to a pulse generator 53 provided in the gauge length measuring mechanism 50, for example, as shown in FIG. A pulse is generated according to the relative displacement of 51a and 51b. This pulse is counted by the counter 54, for example, and the detection member 51 is based on the count value of the counter 54.
The relative displacement amount between a and 51b, that is, the extension amount of the gauge length is determined.

The tension of the test piece 10 is stopped when the elongation amount of the gauge length required for determining the Rankford value r is obtained. That is, the time point is detected from the number of rotations of the screw feed mechanism of the tension mechanism 21, and at that time point, the tension drive mechanism is controlled through the control circuit 40.
21 is controlled to stop pulling the test piece 10. Then, from the count value of the counter 54 at that time, the extension amount 1 of the gauge length is determined.

The test piece width measuring mechanism 60 includes a pair of width measuring elements 61a and 61b facing each other. These width gauges 61a, 61b
Are movable relative to each other so as to change the distance between them, so that each width probe 61a, 61b abuts the parallel edge of the test piece 10 and the distance between them is measured. There is. For example, the width measuring mechanism 60 has a pulse generator that generates a pulse according to the relative movement of the width gauges 61a and 61b, and the width is measured by counting the pulses generated by this pulse generator. The relative amount of movement between the children 61a and 61b is detected, and the distance between the width measuring elements 61a and 61b, that is, the width dimension of the test piece 10 is determined based on the detected amount.

The width dimension measurement of the test piece 10 is performed before and after the test piece 10 is pulled.

In an actual device, the gauge length measuring mechanism 50 and the width measuring mechanism 60 are interlocked with each other, and when one measures, the other retracts to a non-measurement position. Therefore, as the measurement procedure, after the test piece 10 is gripped by the chuck mechanisms 22a and 22b in the tension position, the width measurement mechanism 60 first measures the pre-tension width value W _{0 of the} test piece 10, and then the reference point. The detection members 51a and 51b of the inter-distance measuring mechanism 50 are attached to the respective gauge points of the test piece 10, the test piece 10 is pulled by a predetermined amount, and thereafter, the detection members 51a and 51b of the gauge distance measuring mechanism 50. Is removed from the test piece 10, and the post-pull width value W _r of the test piece 10 is measured again by the width measuring mechanism 60.

In this measurement, the pre-tension gauge length L ₀ is treated as a fixed value, and the post-tension gauge length L _r is calculated from the pre-tension gauge length L ₀ and the gauge length elongation l. , L _r = L ₀ +1.

The respective values L ₀ , L _r , W ₀ , W _r determined as described above are substituted into the equation (1) in the arithmetic circuit 70, and the Rankford value r is calculated there.

[Problems to be Solved by the Invention]

However, the above-mentioned conventional device has the following problems.

That is, after measuring one test piece, the detection members 51a and 51b of the gauge length measuring mechanism 50 are respectively returned to their original positions, that is, initial positions, for measurement of the next test piece. In some cases, the detection members 51a and 51b may not be accurately returned to their original positions. The Rankford value r requires accuracy control of about 5 to 10 μm, and a slight error is not allowed in its measurement. However, as described above, if the detection members 51a and 51b of the gauge length measuring mechanism 50 do not accurately return to their original positions, the pre-tension gauge length L ₀ treated as a fixed value and the actual tension gauge. An error occurs between the point distance and, therefore, a similar error also occurs in the value of the gauge length after pulling L _r . Then, the Rankford value r calculated using these incorrect values will be different from the actual one.

Therefore, an object of the present invention is to accurately measure the control member even when the detection member such as the measuring piece of the gauge length measuring means does not return to the original position accurately as described above. It is to provide such an automatic Rank Ford testing machine.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, for example, as shown in FIG. 1, a pulling means 2 for pulling a plate-shaped test piece in its longitudinal direction, and the plate before and after the plate-shaped test piece is pulled. Width dimension measuring means 6 for measuring the width dimension of the plate-shaped test piece, and the plate by the tensioning means 2 for measuring the distance between the gauge marks of the plate-shaped test piece before and after the pulling of the plate-shaped test piece. -Shaped test piece that moves from the initial position according to the displacement of the gauge point during pulling, and returns after the pulling is completed (for example, the above-mentioned detecting members 51a and 51b) and the plate-like test Gauge distance measuring means 5 equipped with a counter 55 for measuring the amount of movement of the detection member when the piece is pulled, and each measured value measured by the width dimension measuring means 6 and the gauge distance measuring means 5. Calculate Rank Ford value based on In the automatic Rankford tester having the calculating means 7 for operating the counter 55, the counter 55 is composed of a reversible counter, and the reversible counter is counted in the direction opposite to that when the plate-shaped test piece is pulled when the detecting member is returned. Based on the count value of the reversible counter 55 at the time when the backward movement operation of the detection member is completed, and the storage unit 8 that stores the measured value of the gauge length before pulling, The measured value stored in the storage means 8 is corrected, and the corrected measured value is used as the measured value of the gauge length before pulling in the next test.
And the reversible counter 55 is reset after the correction of the measured value by the correction unit 100.

[Action]

In the automatic Rankford tester of the present invention, when the detecting member of the gauge length measuring means 5 is moved back after the measurement operation of one plate-shaped test piece is completed, the reversible counter 55 at the time when the return operation is completed. Based on the count value of, the measured value of the pre-tension gauge point distance stored in the storage means 8 in the previous measurement is corrected. Therefore, even if the detection member of the gauge length measuring means 5 does not accurately return to the original initial position, the measured value of the pre-tension gauge distance used for the measurement becomes the count value of the reversible counter 55. Since it is accurately corrected based on the above, the correct Rank Ford value can always be obtained by the same measurement operation as in the other cases.

〔Example〕

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

FIG. 1 is a block diagram of an automatic Rankford tester according to an embodiment of the present invention. The automatic Rankford tester according to the present embodiment includes a test piece supply mechanism 1 that sequentially and automatically supplies a plate-shaped test piece to its tensile position, and a test piece tensioning mechanism 2 that pulls and drives the plate-shaped test piece at the tensile position. And a test piece collecting mechanism 3 for collecting the plate-shaped test piece after the test. The test piece supply mechanism 1, the test piece pulling mechanism 2 and the test piece collecting mechanism 3 are the same as those described above.
Since the structure can be substantially the same as that disclosed in Japanese Patent Laid-Open No. 0, the detailed description thereof will be omitted here. In the figure, indicates the flow of the plate-shaped test piece. The operation timing of each of these mechanisms is controlled by a control signal from the control circuit 4.

The automatic Rankford tester has a gauge length measuring means 5 for measuring the gauge distance of the plate test piece.
This gauge length measuring means 5 is the same as the above-mentioned actual public Sho 61-3235.
The gauge length measuring mechanism 50 disclosed in Japanese Patent Laid-Open Publication No. 0 may have substantially the same configuration. However, in this embodiment, the counter that measures the amount of movement of the detection member fixed to each reference point of the plate-shaped test piece is the same as the conventional one that generates a pulse according to the relative displacement of the detection member. It is composed of a reversible counter 55 that counts the pulses from the pulse generator 53 in the counting direction according to the moving direction of the detection member. That is, the reversible counter 55 counts in the up direction when the plate-shaped test piece is pulled and the detection member moves in the direction in which the gauge length extends, and counts in the down direction when the detection member returns. .

The width dimension measuring means 6 of the automatic Rankford tester may have substantially the same structure as the width measuring mechanism 60 disclosed in Japanese Utility Model Publication No. 61-32350.

In the present embodiment, the measured values obtained from the gauge length measuring means 5 and the width dimension measuring means 6, that is, the pre-tension gauge distance L ₀ , the post-tension gauge distance L _r , and the pre-tension width dimension. W ₀ and the post-pull width dimension W _r are temporarily stored in the memory 8 attached to the arithmetic circuit 7, and then read from this memory 8 to calculate the Rankford value r in the arithmetic circuit 7.

As shown in the figure, in the automatic Rankford tester of the present embodiment, after the measurement of one plate-shaped test piece is finished, it is stored in the memory 8 before the measurement of the next plate-shaped test piece is started. Correction means 100 for correcting the measured value of the pre-tension gauge length L ₀ is provided. Then, as will be described later, the measured value of the pre-tension gauge length L ₀ in the memory 8 is updated by the value corrected by the correction means 100. After the update, the reversible counter 55 is reset to zero by the control circuit 4.

The measuring operation of the automatic Rankford tester configured as above will be described with reference to FIG.

FIG. 2 is a flowchart showing the measurement procedure of this automatic Rankford tester. First, for the first test piece, the pre-tension gauge length L ₀ is manually and accurately measured. Then, the measured value is input to the arithmetic circuit 7 and stored in the memory 8.

Then, the test piece is supplied to the pulling position and held by the chuck mechanism of the test piece pulling mechanism 2. After that, the width dimension measuring means 6 measures the pre-tension width dimension W ₀ of the test piece, which is input to the arithmetic circuit 7 and stored in the memory 8.

Next, the detecting member of the gauge length measuring means 5 is fixed to each gauge of the test piece, the reversible counter 55 is reset to zero, and then the pulling of the test piece is started.

At this time, the reversible counter 55 counts the pulses generated from the pulse generator 53 in the up direction by the movement of the detection member which is displaced according to the extension of the gauge length between the test pieces.
Then, as described above, when the elongation required for determining the Rankford value r is obtained, the control circuit 4 sends a control signal to the tension mechanism 2 to stop the tension of the test piece. At this time, the gauge length of the test piece is extended by a predetermined amount 1 corresponding to the count value of the reversible counter 55. Therefore, the post-tension gauge length L _r is calculated from L _r = L ₀ +1 and this value is input to the arithmetic circuit 7 and stored in the memory 8.

Then, the detection member of the gauge length measuring means 5 is removed from the test piece, and the width dimension measuring means 6 measures the post-pull width dimension W _r of the test piece again. Then, the measured value is calculated by the arithmetic circuit 7.
To be stored in the memory 8.

The arithmetic circuit 7 uses the respective measurement values L ₀ , obtained as described above,
L _r , W ₀ and W _r are read from the memory 8 and the Rankford value r is calculated.

When the measurement is completed, the test piece tensioning mechanism 2 is returned to the state before the test piece was pulled, and at the same time, the detection member of the gauge length measuring means 5 is also returned to its initial position. At this time, the reversible counter 55 of the gauge length measuring means 5 counts the pulses generated from the pulse generator 53 by the backward movement of the detecting member in the down direction. That is, the count value at the end of pulling the test piece is subtracted.

Thereafter, the test piece collecting mechanism 3 collects the first test piece from the pulled position.

Next, the second test piece is supplied to the pulling position by the test piece supply mechanism 1, and is held by the chuck mechanism of the test piece pulling mechanism 2. Then, the width dimension measuring means 6 measures the pre-tension width dimension W ₀ of the test piece and inputs it to the arithmetic circuit 7. This measured value is stored in the memory 8 in place of the previous pre-tension width dimension W ₀ .

Next, the count value of the reversible counter 55 of the gauge length measuring means 5 is read by the correcting means 100. The reversible counter 55 counts down the backward movement operation of the detection member described above and holds the count value when the backward movement operation of the detection member is completed. The detecting member of the gauge length measuring means 5 does not always return to the original initial position accurately by the returning operation, and may be slightly displaced from the original initial position when the returning operation is completed. I don't know. However, in that case, the count value of the reversible counter 55 is not 0, but has a certain value other than 0. Therefore, by knowing that value, the amount of deviation of the detection member from the original initial position can be known. Therefore, in the present embodiment, the correction means 10
By 0, the count value of the reversible counter 55 when the backward movement of the detection member is completed is read, and the pre-tension gauge length L ₀ of the test piece is corrected by the deviation amount ΔL corresponding to the count value. There is. That is, the correction unit 100 reads the value of the tensile pre-gauge distance L ₀ stored in the memory 8 at that time from the memory 8, by adding the amount of deviation ΔL in the value, new resulting value It is stored in the memory 8 as a measured value of the pre-tension gauge length L ₀ . That is, L ₀ = L ₀ + ΔL. As a result, it is possible to obtain the pre-tension gauge length distance L ₀ at which the detection member is actually located at that time.

After updating the value of the pre-tension gauge length distance L ₀ stored in the memory 8 as described above, the detecting member of the gauge length measuring means 5 is fixed to each gauge point of the test piece, and reversible. The counter 55 is reset to zero.

Then, the pulling of the test piece is started, and the same procedure is repeated thereafter to measure the second, third, ... Test pieces.

According to the above procedure, in the first sheet of the test piece, using a material obtained by measuring the tensile between the leading gauge length L ₀ precisely, for the second and subsequent test strips, the previous measurement measured using the actual shift amount ΔL tensile ago gauge length L ₀ that is properly corrected by the correction means 100 and the inter-tensile pre gauge length L ₀ by the detection member from the distance L ₀ between the tensile before gauge using Is done.
Therefore, the accurate pre-tension gauge length L ₀
Therefore, the accurate Rankford value r can always be obtained.

It is desirable to provide this type of tensile tester with means for detecting breakage of the test piece. The breakage detecting means generally used conventionally is to energize the test piece. However, this energization method requires a relatively large-scale energization device, and has a safety problem such as electric leakage and electric shock.

Therefore, in this embodiment, the breakage of the plate-shaped test piece can be detected.

That is, as shown by the chain line in FIG. 1, in the automatic Rankford tester of this embodiment, the time is measured based on the clock pulse used in the control circuit 4, and the arithmetic circuit 7 measures the measured time. Based on this, the rate of change in elongation of the test piece per unit time when the test piece is pulled by the test piece tensioning mechanism 2 is calculated. That is, the arithmetic circuit 7 determines the fixed time Δt based on the count value of the pulse sent from the counter 55 of the gauge length measuring means 5.
The amount of elongation of the gauge length between test pieces for each test piece is calculated, and the time Δ
From the elongation Δl of the gauge length between t and the change rate Δ at that time
Calculate X = Δl / Δt.

FIG. 3 shows the change in the gauge length 1 during tension of the test piece with time. As is clear from FIG. 3, the gauge distance 1 is such that the rate of change ΔX increases with time. Change. Therefore, if the rate of change ΔX becomes larger than the value of the rate of change immediately before breakage, which has been confirmed and set in advance by another test, it can be considered that the test piece is broken, and in fact there is no problem.

Therefore, in this embodiment, the value of the rate of change ΔX calculated by the arithmetic circuit 7 is compared with the set value in the comparator circuit 9, and when the value of the rate of change ΔX exceeds the set value, the output signal from the comparator circuit 9 is output. I am trying to get it. Then, when the output signal is obtained from the comparison circuit 9, the test piece is considered to be broken, and the test for the test piece is stopped in response to a command from the control circuit 4. In this case, an alarm or the like may be further issued based on the output signal from the comparison circuit 9.

As described above, in this example, the rate of change in elongation of the test piece per unit time is monitored, and when the value of the rate of change exceeds the set value, the test piece is considered to be broken and the test is stopped. I am trying. Therefore, it is possible to detect the breakage of the test piece fairly accurately without using a conventional energizing device or the like.

〔The invention's effect〕

According to the present invention, when the Rankford test of a plate-shaped test piece such as a thin steel plate is automatically and continuously performed, after one test is completed, the detection member of the gauge length measuring means is precisely the original one. even if it does not return to the initial position, since the value between tensile pre gauge length L ₀ by the amount of deviation of the initial position of the detection member is accurately corrected, between tensile pre gauge used in the subsequent test distance L ₀ An exact value can always be used as the value. Therefore, when the pre-tension gauge length L ₀ is different from the actual pre-tension gauge length L ₀ , as in the conventional device that treated the pre-tension gauge length L ₀ as a fixed value. But I measure it as it is,
As a result, it is possible to eliminate the inconvenience of obtaining a Rank Ford value that is different from the actual value. That is, according to the present invention, an accurate Rank Ford value can be always obtained in a continuous test of Rank Ford value.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an automatic Rankford tester according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a flow of measurement operation of an automatic Rankford tester according to an embodiment of the present invention. Fig. 4 is a graph showing the relationship between the elongation of the gauge length of the test piece and the pulling time. Fig. 4 is a schematic diagram showing the outline of a conventional automatic Rankford tester. Fig. 5 is the mark when pulling the test piece. It is a figure which shows typically operation | movement of each detection member of the distance measuring means. In the reference numerals used in the drawings, 1 ... Test piece supply mechanism 2 ... Test piece tension mechanism 3 ... Test piece collection mechanism 4 ... Control circuit 5 ... Gauge distance measuring means 6 ... Width measurement Means 7 ... Arithmetic circuit 8 ... Memory 10 ... Test piece 51 ... Detection member 53 ... Pulse generator 55 ... Reversible counter 100 ... Compensation means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takami Koishikawa, 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. inside the Kimitsu Works (72) Inventor, Tatsuo Ishimaru, Kimitsu 1, Chiba New Nippon Steel Co., Ltd. Inside the Kimitsu Works (72) Hideo Masuse, Inventor Hideo Masuse, No. 1 Shino Nishigoshita-cho, Kita-ku, Kyoto-shi, Shimadzu Corporation (72) Inventor Takeshi Daishi No. 1 Shino-nishitatacho, Kita-ku, Kyoto Shimadzu Corporation (72) Inventor Akio Ueda, No. 1 Shino Nishi Goshotacho, Kita-ku, Kyoto City, Kyoto Prefecture Shimadzu Corporation (56) References Japanese Patent Publication Sho 56-19905 (JP, B2)

Claims (1)

[Claims] 1. A pulling means for pulling a plate-shaped test piece in a longitudinal direction thereof, and a width dimension measuring means for measuring a width dimension of the plate-shaped test piece before and after pulling the plate-shaped test piece.
In order to measure the gauge length of the plate test piece before and after pulling the plate test piece, from the initial position according to the displacement of the gauge point during the pulling of the plate test piece by the pulling means. Gauge distance measuring means having a detecting member configured to move and return after the completion of pulling and a counter for measuring the amount of movement of the detecting member during pulling of the plate test piece, and the width dimension In an automatic Rankford tester having a measuring means and a calculating means for calculating a Rankford value based on each measurement value measured by the gauge length measuring means, the counter is constituted by a reversible counter, and the detection is performed. This reversible counter is configured to count in the direction opposite to that when the plate test piece is pulled when the member returns, and the measured value of the gauge length before pulling is stored. The storage means and the measurement value stored in the storage means are corrected based on the count value of the reversible counter at the time when the backward movement operation of the detection member is completed, and the corrected measurement value is A correction means for storing in the storage means a measured value of the gauge length before pulling in the test is provided, and the reversible counter is reset after the correction of the measured value by the correction means. Automatic Rank Ford Testing Machine.