JP3117856B2 - Hot dimension measuring device for section steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a hot dimension of a section steel such as an H section steel or an I section steel.

[0002]

2. Description of the Related Art Conventionally, there has been a manual sampling inspection using calipers or the like as an inspection of the dimensions of a shaped steel. However, if the inspection is troublesome and a defective product is found, the inspection must be performed again. Was inefficient. Accordingly, a method for inspecting dimensions of H-shaped steels described in Japanese Patent Application Laid-Open No. Sho 54-70071 has been proposed. The shrinkage allowance was determined from the width and the thickness, and the shrinkage allowance was subtracted from the measured value at the time of hot operation to determine the dimension of the section steel at the time of cold, and it was determined whether the size was within the allowable value.

[0003]

However, in the above-described conventional method for inspecting the dimensions of H-shaped steels, for example, in the case of H-shaped steels, a predetermined measurement point on the flanges is used to measure the flanges of the shaped steels. Even if it is the same as the measuring point, the temperature of the measuring point may be different due to the influence of the surrounding environment and the like, and the shrinkage rate varies depending on the temperature distribution depending on the measuring point of the H-section steel, and the measurement accuracy is low. There was a point. The present invention has been made in view of such circumstances,
In the inspection of section steel, it is necessary to provide a hot dimension measurement device for section steel with high inspection accuracy by performing thermal expansion correction that reflects the difference in air cooling rate due to temperature distribution and plate thickness and the effect of forced water cooling, etc. Aim.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The hot-measuring device for a shaped steel according to the present invention comprises a two-axis stage mechanism arranged vertically above and below a stopped shaped steel, which moves in the horizontal and vertical directions, and is attached to the tip of the two-axis stage mechanism. Turning 180 degrees horizontally, and a laser displacement meter capable of detecting the cross-sectional position of the shaped steel in the horizontal and vertical directions, and a radiation thermometer capable of measuring the temperature of the shaped steel surface in the horizontal and vertical directions. And the hot dimension value of the shaped steel obtained from the position of the two-axis stage mechanism, the direction of the detecting head and the measured value of the laser displacement meter, and the surface of the shaped steel is divided into a number of sections. Each section, the internal average temperature in each section is obtained from the surface temperature of each section, and the difference in cooling rate depending on the temperature and plate thickness and the magnitude of the effect of forced water cooling, etc. It from elongation Calculates the length between Les interval cold, is constituted by a data processing means for converting cold dimension of section steel by the sum of said length.

[0005]

In the apparatus for measuring the hot dimension of a shaped steel according to the first aspect of the present invention, the biaxial stage mechanism is moved in a horizontal direction and a vertical direction sandwiching the upper and lower portions of the stopped hot steel by a specific control signal. The detection head attached to the tip of the two-axis stage mechanism moves vertically and horizontally, and the detection head turns. And the detection head has a laser displacement meter capable of detecting a cross-sectional position of the section steel in a horizontal direction and a vertical direction,
In addition, since a radiation thermometer capable of measuring the temperature of the section steel surface in the horizontal and vertical directions is built in, the surface position and the surface temperature of the section steel at a specific position can be measured. Therefore, the position of the biaxial stage mechanism, the direction of the detection head, and the measurement value of the laser displacement meter are input to data processing means to determine the hot dimension value of the section steel. That is, when obtaining the hot dimension measurement value, the laser displacement meter and the radiation thermometer measure the surface temperature of each section obtained by dividing the surface of the shaped steel into a number of sections. Then, the internal average temperature in each section is obtained from the surface temperature of each section of the section steel, and the shape of each section in consideration of the difference in the cooling rate depending on the internal average temperature and the sheet thickness and the magnitude of the effect of forced water cooling, etc. The cold length of each section is calculated from the elongation percentage of the steel, and the cold dimension value of the section steel is obtained from the sum of the lengths.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic front view of an apparatus for measuring the hot dimension of a section steel according to one embodiment of the present invention, FIG. 2 is a front view of a measuring instrument attached to a rotating mechanism, and FIG. 4 is a front sectional view of the measuring instrument, FIG. 5 is a partial sectional view of the same side, FIG. 6 is a schematic configuration diagram of a distance measurement device, FIG. 7 is a schematic configuration diagram of a radiation thermometer, and FIG.
FIG. 9 is a front view showing temperature measurement of the flange surface and the web surface of the section steel, FIG. 9 is an explanatory diagram of the temperature distribution outside the flange portion of the H-section steel hot, and FIG. FIG. 11 is a graph showing the relationship between steel temperature and elongation when the web thickness t1 is changed. FIG. 12 is a graph showing the internal temperature distribution of the flange quarter when the flange outer surface is forcibly water-cooled. FIG. 13 is a graph showing the relationship between the temperature and elongation of the steel material when the degree of forced water cooling of the flange outer surface is different, and FIG. 14 is an explanatory diagram showing the temperature distribution of the H-section steel. As shown in FIG. 1, an apparatus for measuring the hot dimension of a section steel according to one embodiment of the present invention includes first and second sections disposed above and below an H section steel 11 which is an example of a section steel. Two-axis stage mechanisms 13 and 14 and the first
Detection heads 15 and 15a provided at the tips of second two-axis stage mechanisms 13 and 14, and a C-type support base 12 to which the two-axis stage mechanisms 13 and 14 are attached.
And data processing means 16 for receiving the output signal. Hereinafter, these will be described in detail. The first and second biaxial stage mechanisms 13 and 14 are mounted on a support base 12 and wheels 12 a are provided on the bottom of the support base 12.
Is provided and can be moved. A space 18 is formed in an intermediate portion of the support base 12, and the upper and lower sides of the H-shaped steel 11 can be sandwiched between the first and second biaxial stage mechanisms 13 and 14 using the space 18. It has become. Hereinafter, the first and second biaxial stage mechanisms 13 and 14 will be described.

The first two-axis stage mechanism 13 has a horizontal axis mechanism 17 and a vertical axis mechanism 19, and the axis of the vertical axis mechanism 19 is perpendicular to the axis of the horizontal axis mechanism 17. The vertical axis mechanism 19 is moved along the horizontal axis mechanism 17 by the horizontal sliding of the slide member 21, and the vertical axis mechanism 19 itself is also moved up and down around the slide member 21. It goes up and down. The horizontal plate mechanism 17 has a support plate 2 connected to a front part and a rear part by a plurality of guides 24.
2, 23 are provided. A ball screw 25 is provided at the center of the support plates 22 and 23, and the tip thereof is
2 is rotatably fixed to the center portion, and the other end portion rotatably penetrates the center portion of the support plate 23.
Are connected to a motor 27 having Further, a sliding member 21 is mounted and screwed on the guide 24 and the ball screw 25, and by driving the motor 27, the vertical axis mechanism 19 can be moved in the axial direction of the horizontal axis mechanism 17. It has become.

The vertical axis mechanism 19 has support plates 28 and 29, a plurality of guides 30, a ball screw 32, a rotary encoder 34 and a motor 36, like the horizontal axis mechanism 17. The guide 30 and the ball screw 32 are provided on the sliding member 21 of the horizontal shaft mechanism 17 so as to be slidable in the vertical direction via a built-in female screw portion. Further, a bearing 38 for rotatably providing an end of the ball screw 32 is provided at the center of the upper surface of the support plate 28 as shown in FIG. A heat-resistant bellows 39 is attached outside the guide 30 and the ball screw 32. On the lower surface of the support plate 28, a rotation mechanism 40 and a measuring device 42 constituting the detection head 15 are attached. The measuring device 4
2 is rotatably connected to the rotation mechanism 40,
As shown in FIG. 2, the rotation mechanism 40 and the measuring device 42 are covered with a heat insulating material 44 except for a part thereof, so as to protect the measuring device 42 from high heat generated during the heating. The vertical axis mechanism 19
When the motor 36 rotates, the ball screw 32 rotates, the vertical axis mechanism 19 moves up and down, and the measuring instrument 42 can be arranged at a predetermined height. From the above, if the motor 27 of the horizontal axis mechanism 17 and the motor 36 of the vertical axis mechanism 19 are driven,
The ball screws 25 and 32 rotate, and the vertical axis mechanism 19 via the sliding member 21 moves in the axial direction of the horizontal axis mechanism 17 and moves up and down to provide the detection head 15 at an arbitrary position. The measuring device 42 is turned by the operation of the rotation mechanism 40.

Since the horizontal axis mechanism of the second two-axis stage mechanism 14 has the same configuration as the horizontal axis mechanism 17 of the first two-axis stage mechanism 13, its components are assigned the same numbers and assigned the same numbers. Description is omitted. The longitudinal axis mechanism 20 of the second biaxial stage mechanism 14 has the same mechanism as the longitudinal axis mechanism 19 of the first biaxial stage mechanism 13, but is manufactured with a short overall length. Therefore, for the sake of simplicity, the guide is denoted by 31 and the ball screw is denoted by 33. Also, the motor is denoted by 37, the rotary encoder is denoted by 35, the rotation mechanism of the detection head 15a is denoted by 41, and the measuring device is denoted by 43.

As shown in FIGS. 2 and 3, a base is fixed to the support plate 28, and a connecting plate 45 is attached to the tip of the rotation mechanism 40, 41 of the detection head 15, 15a (same for 15a). Is provided with an outer cylinder 46 to which is fixed. A motor with an encoder is built in the outer cylinder 46. The driving of the motor can rotate the measuring device 42 by about 180 ° by controlling the rotation of the encoder. As shown in FIGS. 4 and 5, the measuring devices 42 and 43 (similarly, 43) include a ring-shaped rotating plate 47, a distance meter 48, and a radiation thermometer 4.
9 is provided. The rotating plate 47 is fitted inside the base of the storage container 50, and the distance meter 48 and the radiation thermometer 49 are disposed inside the storage container 50. The storage container 50 is
Each base consists of an outer container 51 and an inner container 53 that are open. The outer container 51 has a flange 52 at the base and a bulge 55 at one end of the tip.

The bulging portion 55 is provided with three circular holes 57 to 59 penetrating therethrough, and three long holes 60 and 61 juxtaposed to the circular holes 57 to 59. In FIG. 5, only two of the three long holes are shown, and the center circular hole 58 and the long hole 61 are not substantially used. Temperature measuring holes 62 and 63 are formed at the front and side portions of the outer container 51, and the H-shaped steel 11 which is hot using a radiation thermometer 49 is formed.
Temperature can be measured. The inner container 53 is provided so as to be joined to the inside of the outer container 51, a heat-resistant glass 65 is fitted into a portion of the outer container 51 located inside the bulging portion 55, and the bottom surface and side surfaces have the temperature of the outer container 51. The heat-resistant glass 6 is positioned at the measurement holes 62 and 63.
8 and 69 are provided, and the built-in radiation thermometer 49 can measure the temperature of the hot H-shaped steel 11.

A distance meter 48 and a radiation thermometer 49 built in the storage container 50 are disposed in a middle container 53.
The mounting plate 70 is fixed to the rotating plate 47.
The mounting plate 70 is reinforced by ribs 71. Measuring instrument 42
Is rotated by driving a motor with a rotary encoder in the rotation mechanism 40. The distance meter 48
Has laser displacement meters 72 and 73 for distance measurement in the horizontal direction A and the vertical direction B, as shown in FIG. Since the configurations and functions of the laser displacement meters 72 and 73 are the same, only the laser displacement meter 73 will be described. As shown in FIG. 6, the laser displacement meter 73 has a one-dimensional CCD 74 (CCD: Charge Co.)
an integrated device), a semiconductor laser 75 provided on one side in front of the one-dimensional CCD 74, a condenser lens 76 and a slit 77, and a mirror 78 provided on the other side of the one-dimensional CCD 74. It is configured to include a lens 79, an interference filter 80, and a prism 81. In addition, the interference filter 80 is provided in order to prevent the influence of red heat when measuring the red hot section steel. The laser displacement meter 73 uses a laser beam to determine the distance to the object to be measured by triangulation. Specifically, the semiconductor laser 75 oscillates laser light, and the laser light is
7, and passes through the heat-resistant glass 65 and strikes the object to be measured, and the reflected light enters the one-dimensional CCD 74 via the heat-resistant glass 65, the prism 81, the interference filter 80, the lens 79 and the mirror 78, and The distance to is calculated. Its accuracy is about 10μ
m.

As shown in FIG. 7, the radiation thermometer 49 includes a control unit 82, two light receiving elements 83 and a lens 84,
A light receiving element 85 and a lens 86 are provided. Light receiving element 8
Each of 3 and 85 measures the temperature of the surface of the H-beam 11 in the horizontal and vertical directions. The control unit 82 processes the temperature data from the light receiving elements 83 and 85 and the measurement data from the laser displacement meter 72 and transmits the data to the data processing unit 16. The rotation mechanism 4
The turning state of the detection heads 15 and 15a by 0 and 41 is detected by the rotary encoder and transmitted to the data processing means 16 together with data of the rotary encoder attached to another motor. That is, the data processing means 16
Is connected to the rotary encoders 26, 34, 35 of the first and second two-axis stage mechanisms 13, 14 and measuring instruments 42, 43 for measuring distance and temperature, receives data signals from these, and The hot dimension value of the section steel 11 is determined.

Next, a description will be given of a method of using the apparatus 10 for measuring the hot dimension of a section steel according to one embodiment of the present invention. The hot dimension measuring device 10 is previously arranged at a predetermined position in the middle of the roller table. As shown in FIG. 1, when using the hot dimension measuring device 10 for a shaped steel, a calibration sample 87 is required in advance. , The respective laser displacement meters 72, 7
3. Check the operation and measure the reference position. Next, the red hot H-shaped steel 11 immediately after being manufactured is transported by the roller table, and its measurement position is moved to a position where the first and second biaxial stage mechanisms are located. H-section steel 11
The method of measuring the flange portions 90 and 91 and the method of measuring the web portion 92 of the first and second biaxial stage mechanisms 1
A detailed description will be given together with a method of arranging the measuring devices 42 and 43 of the devices 3 and 14, respectively.

First, as shown in FIG. 8A, the first and second two-axis stage mechanisms 13 and 14 are operated by a previously input program, and the upper and lower measuring devices 42 and 43 are made of H-shaped material. The calibration sample 87 is moved into the upper and lower grooves, respectively, and the distance of the sample 87 is measured using the laser displacement meters 72 and 73 for measuring the vertical and horizontal distances. Thus, the current positions of the measuring devices 42 and 43 are confirmed. Then, as shown in FIG. 8 (A), the two-axis stage mechanisms 13 and 14 are driven to measure the width and height of the H-shaped steel 11 to be measured first, and the schematic dimensions (that is,
Standard dimensions). Next, as shown in FIG. 8 (B), the upper and lower measuring instruments 42 and 43 are moved while keeping an interval of about 40 mm from the H-shaped steel 11 to measure the laser displacement meters 72 and 73 for measuring the horizontal and vertical distances. Distances, output values of rotary encoders 26, 34, 35 attached to respective motors 27, 36, 37, and measuring instruments 42, 43
The hot outer dimensions of the H-shaped steel 11 are measured from the output values of a rotary encoder attached to a motor for driving the H-shaped steel 11.

However, when the H-section steel 11 is in a red-hot state, the whole expands and is measured to be considerably larger than a dimension value when the H-type steel 11 is cooled and does not match the cold value. . Therefore, a radiation thermometer 49 is provided inside each of the measuring devices 42 and 43. The distance is measured by the laser displacement meters 72 and 73, and at the same time, the temperature of the portion is measured.
A more accurate cold dimension value is calculated. Hereinafter, these will be described in detail.

The temperature of the inner quota portion and the outer surface of the flange portion 90 are measured by the first and second biaxial stage mechanisms 13,
8 and 9, the upper inner quota portion of the flange portion 90 and the upper half of the outer surface 93 are measured using the lower inner quota, as shown in FIGS. The case where the part and the lower half of the outer surface are measured using the measuring device 43 will be described. First, measurement of the inner quota of the flange will be described. The measuring devices 42 and 43 are arranged inside the flange portion 90, and the motor 36,
By driving the 37, the measuring device 42 is raised and the measuring device 43 is lowered, and the respective measuring devices 42 and 43 are arranged at the height of the quota portion along the inner surface of the flange portion 90. Next, the rotation mechanisms 40, 41 of the longitudinal axis mechanisms 19, 20
Is operated so that the axes of the circular holes 57 and the temperature measuring holes 63 of the measuring devices 42 and 43 are perpendicular to the flange surface 93.

Next, the motor 27 of the horizontal axis mechanism 17 of each of the first and second biaxial stage mechanisms 13 and 14 is operated to rotate the respective ball screw 25, and the measuring instruments 42 and 43 are connected to the flange 90. It is arranged at a predetermined distance (about 40 mm) from the inner surface. The distance between the measuring devices 42 and 43 and the inner surface of the flange portion 90 is measured using a laser displacement meter 73 built in the measuring devices 42 and 43. Specifically, FIG.
As shown in FIG. 6, the semiconductor laser 75 is operated to emit a laser beam, and the laser beam is transmitted through the condenser lens 76, the slit 77, the heat-resistant glass 65, the bulging portion 55, and the circular hole 57 according to the principle of three-point measurement. Distance measurement is performed by generating reflected laser light from a point. Further, the reflected laser light is applied to the prism 8.
1 and is transmitted through the interference filter 80.
The light is reflected by the mirror 78 via the lens 79 and is incident on the one-dimensional CCD 74 to measure the distance. Since the laser displacement gauge 72 has the same configuration as the laser displacement gauge 73, the flange portions 90, 9 of the H-section steel 11 are formed in the same manner.
1 is used for measuring the distance of the web portion 92. Next, the motors 36 and 37 of the longitudinal axis mechanisms 19 and 20 are operated, and the measuring devices 42 and 43 are moved up and down to measure the temperature of the inner quota of the flange using the radiation thermometer 49.

As shown in FIGS. 4 and 7, the temperature of the inner quota of the flange portion 90 of the H-section steel 11 is measured by the radiation thermometer 49 receiving radiation heat from the inner surface of the flange portion 90. . Specifically, the radiant heat from the H-section steel 11 is transferred from the heat-resistant glass 69 to the lens 8 inside the measuring instrument 42.
The control unit 82 receives the temperature data together with the position information of the temperature measurement point through the data processing unit 16.
This is done by sending to Next, measurement of the outer surface of the flange will be described. The motor 27 of the horizontal axis mechanism 17 and the motors 36 and 37 of the vertical axis mechanisms 19 and 20 of both the first and second biaxial stage mechanisms 13 and 14 are operated so that the respective measuring devices 42 and Arrange 43,
Furthermore, the motors 36 and 37 are driven to lower the measuring device 42 and the measuring device 43 is raised, and the respective measuring devices 42 and 43 are arranged at a predetermined height along the flange surface 93. Next, the rotation mechanism 4 of the vertical axis mechanisms 19 and 20
0 and 41 are actuated to rotate the circular holes 57 and the temperature measuring holes 63 of the measuring devices 42 and 43 so that the axes thereof are perpendicular to the flange surface 93.

Next, the motors 27 of the horizontal axis mechanisms 17 of the first and second biaxial stage mechanisms 13 and 14 are operated to rotate the respective ball screws 25 and the measuring instruments 42 and 43 are moved from the flange surface 93 to the flanges 93. Predetermined distance (about 40m
m). The distance between the measuring devices 42 and 43 and the flange surface 93 is measured using a laser displacement meter 73 built in the measuring devices 42 and 43. Next, the motors 36 and 37 of the longitudinal axis mechanisms 19 and 20 are operated, the measuring devices 42 and 43 are moved up and down, and the temperature of the flange surface 93 is measured using the radiation thermometer 49.

As shown in FIGS. 4 and 7, the temperature of the upper half of the flange surface 93 of the H-section steel 11 is measured by the radiation thermometer 49 receiving radiant heat from the flange surface 93. The temperature of the lower half of the flange surface 93 is similarly measured using the radiation thermometer 49 of the measuring device 43.

A method of correcting the coldness of the H-section steel 11 using the data processing means 16 will be described below. The data processing means 16 includes first and second two-axis stage mechanisms 1
Data signals from the rotary encoders 26, 34, 35 and the control unit 82 are received from the control units 3 and 14, and the operation is performed by a program for determining a cold dimension value of the H-section steel 11. The program is obtained by programming mathematical formulas, and its basic configuration will be described below. First, the cold correction of the flange portion 90 of the H-section steel 11 will be described. As shown in FIG. 9, a plurality of measurement points are defined as X _i (where i = 1, 2,..., N) on the flange surface 93, and upper and lower ends of the flange surface 93 are respectively measured by the measuring devices 42 and 43. Are determined as b1 and b2 from the measurement of the distance meter 48, and the upper and lower ends of the flange surface 94 of the flange portion 91 shown in FIG. The data processing unit 16 stores the position of the measurement points X _i and b1, b2, further radiation thermometer 4
9 stores the measured surface temperature T _i of the flange surface 93. Therefore, (X _i , T _i ), i = 1, 2, 3,.
.., N values are stored. Similarly, the temperatures T ₂ ", T ₁ " inside and outside the flange quota portion are obtained. Flange outer surface is sometimes forced water cooling to reduce the temperature difference between the flange portion and web portion, if there are remaining this effect, T ₂ "> T _1" becomes as shown in FIG. 12 (a) If not water-cooled, T ₂ ″ and T ₁ ″ become substantially equal as shown in FIG. Next, from the measurement position of the flange surface 93, an intermediate point P _i of each temperature data collection position is calculated, and P _{1 to} P _N−1
Ask for. Here, when obtaining the P _i as i = 1,2,3 ···· N-1 as shown in equation (1).

[0023]

(Equation 1)

Next, for i = 2 to N-1, the thermal expansion of the minute section [P _i-1 , P _i ] is corrected. In this method, the coefficient α (≧ 1) is applied to the outer surface temperature in consideration of the temperature difference between the temperature data T _i of the flange surface 93 and the central portion, and ΔT / 2 is added in consideration of the temperature difference in the inner and outer surfaces of the flange. internal average 'When, T _i' temperature T _i was equation seeking is as follows. T _i ′ = α × T _i + ΔT / 2 (2) FIG. 14 shows an example in which the internal temperature distribution of an H-shaped steel having a specific size is obtained by simulation. It is estimated that the internal temperature distribution is as shown in FIG. When the steel is water-cooled during transformation, its thermal elongation shifts to a lower temperature as shown in FIG. The degree of supercooling depends on the material temperature during cooling and the strength of water cooling, but the temperature of the material when it reaches the water-cooling device is substantially the same as long as the H-section steel has the same size. Therefore, the degree of the supercooling is ultimately determined by the strength. Therefore, the cooling intensity is set by stratifying roughly two levels from a setting device (not shown), and the thermal elongation shifted to the lower temperature side is applied based on this information in consideration of the fluctuation of the thermal elongation. The elongation with respect to the internal average temperature T _{S is} obtained from the table of the elongation rate ε _x (FIG. 13), and is linearly interpolated as necessary to obtain the following equation. (P _i −P _i−1 ) / (1 + ε _x (T _i ′)) (3) where i = 2 to N−1 Further, a minute section [b2, P ₁ ] at i = 1 i =
The thermal expansion of the minute section [P _N−1, b1] in _{N is} corrected. The formula is shown in the following (4) and (5). i = 1
In the case of (P ₁ −b 2) / (1 + ε _x (T ₁ ′)) (4) When i = N, (b ₁ −P _N−1 ) / (1 + ε _x (T _N ′)) (5) Using the above equations (1) to (5), the other flange portion 91
, The cold correction is performed by performing the same processing.

Therefore, the cold correction value of the width of each of the flange portions 90 and 91 is expressed by the following equation (6), where BDr is the width of the flange portion 90. Further, for the cold correction of the flange portion 91, the rotation mechanisms 40 and 41 of the first and second biaxial stage mechanisms 13 and 14 are operated, and the circular holes 57 and the temperature measurement holes of the measuring instruments 42 and 43, respectively. 63 so that the axial center of the steel 63 is perpendicular to the flange surface 94,
0, and the width of the flange portion 91 is set to BF.
When r is obtained, the equation (7) is obtained. However, in Equations (6) and (7), the position data and temperature data on the flange portions 90 and 91 are data collected at each location.

[0026]

(Equation 2)

[0027]

(Equation 3)

As shown in FIG. 10, the web height H
The temperature of the center S ₀ of the flange surface 93 of the flange portion 90 and the temperature of the center S _N of the flange surface 94 of the flange portion 91 are measured by the measuring device 42 or the measuring device 43. The measured value and T _N is at a point T _0, S _N is at the position of S _0.

The cold correction of the web height H will be described. As shown in FIG. 1, the respective motors 27 of the horizontal axis mechanism 17 of the first and second biaxial stage mechanisms 13 and 14 and the motors 36 and 37 of the vertical axis mechanisms 19 and 20 are driven, and as shown in FIG. As shown, the measuring device 42 above the web surface 95 of the H-section steel 11 and the measuring device 4 below the web surface 96.
3 and the measuring instruments 4 from the web surfaces 95, 96 using the laser displacement meter 72 of the respective measuring instruments 42, 43.
While measuring the distance to 2, 43, the vertical axis mechanism 19, 2
0 motors 36, 37 are activated to drive the web surfaces 95, 96
The measuring instruments 42 and 43 are arranged at a predetermined distance (about 40 mm) from. Then, the first and second biaxial stage mechanisms 1
By operating the motor 27 of the horizontal shaft mechanism 17 of each of the third and the fourth, the measuring instruments 42 and 43 are moved along the web surfaces 95 and 96 to measure the distance, and the web surfaces 95 and 96 are measured.
Measure the surface temperature. The measurement points on the web surfaces 95 and 96 are stored in advance in the data processing means 16 as a program. As shown in FIG. 10, the measurement points are x _i, and the measurement temperature at each measurement point x _i is t
and _i, obtain the relationship between (x _i, t _i). Where i =
.., N−1. Then, x ₁
The intermediate point Si between .about.x _N-1 is calculated by the following equation (8).

[0030]

(Equation 4)

However, in the equation (8), i = 1, 2,.
..., N-1. Then, i = 3 to N-1
, The thermal expansion of the minute section [S _i−1 , S _i ] is corrected. The temperature obtained by multiplying the outer surface temperature by the coefficient β (≧ 1) in consideration of the temperature difference between the temperature data t _i of the web surface 95 and the central portion is defined as the central temperature t _S. t _S is represented by equation (9). t _S = β × t _i ··· (9) Although the thermal elongation in the transformation zone of steel changes depending on the cooling rate of the material, the cooling rate mainly depends on the web thickness because the web surface is air-cooled. The determination will be apparent from various experiments by the inventors. As the cooling rate increases, the thermal elongation shifts to a lower temperature. Therefore, the thermal elongation change curve is changed according to the measured web thickness. Here, the range of the thickness of the web is 6 to 20 mm, so that the web is divided into 3 to 6-1.
0, 11 to 15, and 16 to 20 mm are applied and three types of elongation rates are applied. The elongation rate ε _x with respect to the internal average temperature ts is obtained by linearly interpolating the table (FIG. 11), and the elongation of the minute portion is given by the following equation. (S _i −S _i−1 ) / (1 + ε _x (βt _S )) (10) where i = 3 to N−1.

Next, [S ₀ , S ₂ ], [S _N−1 , S _N ]
In the section (2), the thermal expansion is corrected by complementing the temperature with a straight line. Then, in the section of [S ₀ , S ₂ ], the temperatures are set as t ₀ , t
Perform linear interpolation between ₁ Further, the temperature function obtained as described above is defined as t (s). The correction coefficient γ for the internal average temperature value inside the web portion 92 is introduced to change the average temperature distribution in the web to t ′.
Equation (11) is shown as (s). t ′ (s) = γ × t (s) (11) The elongation ε (t ′) corresponding to the temperature t ′ (s) is obtained from the table. At this time, the elongation rate corresponding to the thickest t1 is applied. Distance S of section [S ₀ , S ₁ ]
The cold correction values of _{1 to} S ₀ are obtained by equation (12).

[0033]

(Equation 5)

Similarly, the cold correction value in the section [S _N−1 , S _N ] is obtained by equation (13).

[0035]

(Equation 6)

The cold correction value of the web height H is given by the following equation (14).
Ask by

[0037]

(Equation 7)

As described above, the apparatus for measuring the hot dimension of a section steel 1
If 0 is used for the cold correction of the H-section steel 11, the data processing means 16 is used to determine the internal average temperature for each predetermined section of the divided H-section steel 11, and further calculate the average temperature of the H-section steel 11 for each section. The length of each section in the cold state is calculated in consideration of the elongation rate, and the dimension value of the H-section steel 11 in the cold state is obtained from the sum of the lengths. Interpolation correction can be realized. In particular, the elongation percentage of a steel product does not necessarily increase with an increase in temperature. As shown in FIGS. 11 and 13, a phase transformation may occur in a steel material at around 700 ° C. to 820 ° C. Therefore, it is possible to improve the accuracy of the H-section steel 11 by dividing the surface thereof and performing cold correction in consideration of the effect of forced water cooling on the flange portion and the effect of the cooling rate on the web surface on the web surface. It is a necessary condition for obtaining the hot-rolling correction, and as a result, the apparatus for measuring a hot dimension of a section steel can be said to be a very excellent apparatus. 11 and 13, the horizontal axis represents the temperature of the steel material, and the vertical axis represents the elongation.

[0039]

According to the first aspect of the present invention, the apparatus for measuring the hot dimension of a section steel is provided with a two-axis stage mechanism, a detection head containing a laser displacement gauge and a radiation thermometer, and data processing means. The hot dimension value of the section steel is obtained from the position of the biaxial stage mechanism, the direction of the detection head, and the measurement value of the laser displacement meter, and the data processing means calculates the hot dimension value from the surface temperature of each section of the section of the section steel section. The internal average temperature in each section is determined, the length of each section in the cold state is calculated in consideration of the elongation of the section steel in each section at the internal average temperature, and the section steel is calculated from the sum of the lengths. Since the cold dimension value is obtained, the inspection accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an apparatus for measuring a hot dimension of a section steel according to one embodiment of the present invention.

FIG. 2 is a front view of a measuring instrument attached to a rotating mechanism.

FIG. 3 is a side view of the same.

FIG. 4 is a front sectional view of the measuring instrument.

FIG. 5 is a partial sectional view of the same side.

FIG. 6 is a schematic configuration diagram of a distance meter.

FIG. 7 is a schematic configuration diagram of a radiation thermometer.

FIG. 8 is a front view showing temperature measurement of a flange surface and a web surface of the H-section steel.

FIG. 9 is an explanatory diagram of a temperature distribution on the outside of the flange portion of the H-section steel in a hot state.

FIG. 10 is an explanatory diagram of a temperature distribution outside the web portion of the H-section steel during hot working.

FIG. 11 is a graph showing the relationship between steel temperature and elongation when the web thickness t1 is changed.

FIG. 12 is a schematic diagram of an internal temperature distribution of a flange quota portion when a flange outer surface is forcibly water-cooled.

FIG. 13 is a graph showing the relationship between the temperature and the elongation of the steel material when the degree of forced water cooling of the flange outer surface is different.

FIG. 14 is an explanatory diagram showing a temperature distribution of an H-section steel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hot dimension measuring device of section steel 11 H section steel 12 Support stand 13 1st 2 axis stage mechanism 14 2nd axis axis mechanism 15 Detecting head 15a Detecting head 16 Data processing means 17 Horizontal axis mechanism 18 Space 19 Vertical Shaft mechanism 20 Vertical axis mechanism 21 Sliding member 22 Support plate 23 Support plate 24 Guide guide 25 Ball screw 26 Rotary encoder 27 Motor 28 Support plate 29 Support plate 30 Guide guide 31 Guide guide 32 Ball screw 33 Ball screw 34 Rotary encoder 35 Rotary encoder 36 Motor Reference Signs List 37 motor 38 bearing 39 heat-resistant bellows 40 rotating mechanism 41 rotating mechanism 42 measuring device 43 measuring device 44 heat insulating material 45 connecting plate 46 outer cylinder 47 rotating plate 48 distance measuring meter 49 radiation thermometer 50 storage container 51 outer container 52 flange portion 53 middle Container 55 Swelling part 57 circular hole 58 circular hole 59 circular hole 60 long hole 61 long hole 62 temperature measurement hole 63 temperature measurement hole 65 heat resistant glass 68 heat resistant glass 69 heat resistant glass 70 mounting plate 71 rib 72 laser displacement meter 73 laser displacement meter 74 primary Original CCD 75 Semiconductor laser 76 Condenser lens 77 Slit 78 Mirror 79 Lens 80 Interference filter 81 Prism 82 Control unit 83 Light receiving element 84 Lens 85 Light receiving element 86 Lens 87 Calibration sample 89 Pass line 90 Flange part 91 Flange part 92 Web part 93 Flange Surface 94 Flange surface 95 Web surface 96 Web surface

Continued on the front page (72) Inventor Mitsui Sato 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Akinori Ogasawara 1-3-10, Shirogane, Kokurakita-ku, Kitakyushu-shi, Fukuoka Stock (56) References JP-A-2-254304 (JP, A) JP-A-5-99636 (JP, A) JP-B-53-36338 (JP, B1) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G01B 11/00-11/30 102 B21C 51/00 G01B 21/00-21/32

Claims (1)

(57) [Claims] 1. A two-axis stage mechanism which is disposed above and below a stationary steel section and which moves in the horizontal and vertical directions, and is attached to the tip of the two-axis stage mechanism and pivots 180 degrees horizontally. A laser displacement gauge capable of detecting the cross-sectional position of the shaped steel in the horizontal and vertical directions, and a detection head incorporating a radiation thermometer capable of measuring the temperature of the shaped steel surface in the horizontal and vertical directions, The position of the biaxial stage mechanism, the direction of the detection head, and the hot dimensional value of the shaped steel obtained from the measured value of the laser displacement meter, the surface of the shaped steel is divided into a number of sections, The internal average temperature in each section is determined from the surface temperature of each section, and the difference in the cooling rate depending on the temperature and the sheet thickness and the elongation of the section steel in each section in consideration of the magnitude of the effect of the forced water cooling, etc. In the cold Kicking calculates the length, hot dimension measuring device in the form steel, characterized in that said data processing means is converted into cold dimension of section steel by the sum of said length.