JP7694552B2 - Surface roughness measuring device and surface roughness measuring method - Google Patents

Description

The present invention relates to a surface roughness measuring device and a surface roughness measuring method for detecting the surface roughness of roll surfaces of rolling rolls such as hot rolling rolls.

Conventional surface inspection of rolling rolls involves a method known as ultrasonic testing. In ultrasonic testing, an ultrasonic probe is held at a fixed distance from the surface of the object, and ultrasonic waves are transmitted from the ultrasonic probe to the object via an acoustic coupling medium to detect defects present on the surface or just below the surface of the object (see, for example, Patent Document 1).

In addition, there is a method in which a roll surface defect detection device has a linear sensor or area sensor that irradiates a single light source and detects the reflected or diffused light, and detects surface defects on the inspected roll by processing the sensor output (see, for example, Patent Document 2).

JP 2012-103033 A JP 2010-014515 A

However, the conventional technology has the following problems.
In the techniques disclosed in Patent Documents 1 and 2, it was not possible to directly measure the roll using a large sensor capable of measuring surface roughness due to the load-bearing capacity and weight. Therefore, the rolling roll surface was molded to create a replica, and the roughness of the unevenness copied onto the replica was measured. There was a problem in creating the replica because it took time for the softened resin to harden.

The present invention has been made in consideration of the above circumstances, and aims to provide a surface roughness measuring device and a surface roughness measuring method that can directly measure the surface roughness of a rolling roll after rolling and can measure surface roughness with high accuracy in a short time.

The surface roughness measuring device according to the present invention, which advantageously solves the above problems, is a surface roughness measuring device for measuring the surface roughness of a rolling roll, and is characterized by comprising a displacement sensor whose detection unit faces the surface of the rolling roll and measures the distance to the roll surface of the rolling roll, a controller for the displacement sensor, a housing that houses the displacement sensor and the controller, a support beam that supports the housing, a shuttle table to which the housing is fixed and which can move back and forth on the support beam parallel to the axial direction of the rolling roll, a fixing jig that fixes the support beam to a chock that fixes the rolling roll, and a rotation mechanism that rotates the housing on a vertical plane including a line parallel to the axial direction of the rolling roll, with the position of the shuttle table as the rotation axis.

The surface roughness measuring device according to the present invention is
(a) further comprising an advancing/retracting mechanism for advancing/retracting the housing toward/from the surface of the rolling roll;
(b) a housing for separately accommodating the displacement sensor and the controller is disposed on either side of the carriage, and the housing has a heat-resistant block on the side of the reduction roll;
(c) the controller has a function of calculating surface data of the rolling roll surface based on the surface displacement data measured by the displacement sensor;
(d) the calculation function has a function of calculating parameters of surface roughness;
(e) the displacement sensor has a function of measuring a displacement amount in a two-dimensional area;
This may be a more preferable solution.

The surface roughness measurement method of the present invention, which advantageously solves the above problem, is characterized in that any of the above surface roughness measurement devices is fixed to the chock of the rolling roll after rolling, and the roughness of the rolling roll surface is detected while moving a displacement sensor parallel to the axial direction of the rolling roll.

In addition, a more preferable solution for the surface roughness measurement method of the present invention is to measure the surface roughness of one rolling roll, then rotate the displacement sensor around the position of the carriage in a vertical plane as an axis, and measure the surface roughness of another rolling roll.

The surface roughness measuring device and method of the present invention allow the surface roughness of a rolling roll to be measured directly after rolling. It is possible to measure the surface roughness of a rolling roll directly after rolling with the same accuracy as a molded replica without contact, in a shorter time, and without any gaps in the axial direction of the roll.

1 is a schematic front view showing an overview of a surface roughness measuring device according to an embodiment of the present invention. FIG. 11 is a schematic diagram showing the procedure for assembling the surface roughness measuring device according to the embodiment, and is a top view showing the procedure for fixing the solid jig of the support beam to the chock. FIG. 11 is a schematic diagram showing the assembly procedure of the surface roughness measuring device according to the embodiment, in which (a) is a top view of the support beam attached to the solid jig, (b) is a side view thereof, and (c) is a partial front view thereof. 5A and 5B are schematic diagrams showing the procedure for assembling the surface roughness measuring device according to the embodiment, in which FIG. 5A is a top view of the carriage attached to the support beam, and FIG. 5B is a front view thereof. FIG. 13 is a schematic diagram showing the assembly procedure of the surface roughness measuring device according to the embodiment, and is a front view of the state in which the controller side housing is attached to the carriage. FIG. 11 is a schematic diagram showing the assembly procedure of the surface roughness measuring device according to the embodiment, and is a front view of a state in which a displacement sensor side housing is attached to the carriage. 3A to 3C are schematic diagrams illustrating a surface roughness measuring method using the surface roughness measuring device according to the embodiment. 5A and 5B are schematic front views showing surface roughness measurement positions, in which FIG. 5A shows the case where the surface roughness measuring device according to the embodiment is used, and FIG. 5B shows the replica collection position according to the conventional method. 1 is a graph comparing the roughness of a rolling roll measured using the surface roughness measuring device according to the embodiment with the roughness measured by a conventional method.

The following is a detailed description of the embodiments of the present invention. Note that the drawings are schematic and may differ from the actual ones. The following embodiments are intended to exemplify equipment and methods for embodying the technical ideas of the present invention, and are not intended to specify the configuration as described below. In other words, the technical ideas of the present invention can be modified in various ways within the technical scope described in the claims.

Figure 1 is a schematic front view showing an overview of a surface roughness measuring device according to one embodiment of the present invention. Figures 2 to 7 are schematic diagrams showing the assembly procedure of the surface roughness measuring device according to the above embodiment. The surface roughness measuring device 1 of this embodiment is fixed to a chock 3 that fixes the rolling roll 2 in order to measure the surface roughness of the rolling roll 2 after rolling. The surface roughness measuring device 1 comprises a displacement sensor 4, a controller 5 for the displacement sensor 4, a housing 6, a support beam 7, a reciprocating table 8, a fixing jig 9, and a rotation mechanism for the reciprocating table 8. It is further preferable to have an advance/retract mechanism that moves the housing 6 toward and away from the surface of the rolling roll 2.

The displacement sensor 4 is installed with a detection unit facing the surface of the rolling roll 2, and has a function of measuring the distance to the surface of the rolling roll 2. The displacement sensor 4 has a function of measuring the amount of displacement in a two-dimensional area. The controller 5 has a function of calculating the surface data of the rolling roll 2 surface based on the surface displacement data measured by the displacement sensor 4. The calculation function has a function of calculating surface roughness parameters. As the surface roughness parameters, the arithmetic mean roughness Sa, the maximum peak height Sp, the maximum valley depth Sv, and the maximum height Sz which is the sum of Sp and Sv can be used.

The housing 6 houses the displacement sensor 4 and the controller 5, and is fixed to the carriage 8. The displacement sensor 4 and the controller 5 are connected by a cable 10, allowing them to communicate commands and measurement data. It is preferable to fasten the cable 10 to a fixture for fastening the housing 6 to the carriage 8 with a hook-and-loop fastener or the like. In addition, the housing 6 that houses the displacement sensor 4 has a heat-resistant block on the side of the rolling roll 2. This can protect the displacement sensor 4 from heat from the high-temperature rolling roll 2 after rolling.

The support beam 7 has both ends fixed to chocks 3 located at both axial ends of the rolling roll 2 by fixing jigs 9. The carriage 8 is installed on the support beam 7 so that it can move back and forth parallel to the axial direction of the rolling roll 2. The carriage 8 can rotate the housing 6, which is placed on either side of the carriage 8, around the position of the carriage 8 as an axis. The rotation is performed by a rotation mechanism on a vertical plane that includes a line parallel to the axial direction of the rolling roll 2.

(Assembly mechanism)
Hereinafter, a procedure for assembling the surface roughness measuring device 1 according to this embodiment so as to measure the surface roughness of the reduction roll 2 after rolling will be described.
As shown in the schematic top view of Figure 2, a groove-shaped fixing jig 9 is fixed by fixing screws 9A so as to sandwich the spacers 3A of the pair of chocks 3. A hexagon socket head bolt or the like can be used as the fixing screw 9A. The same applies below.

As shown in the schematic top view of Figure 3(a), both ends of the support beam 7 are screwed to the fixing jig 9. It is fixed with fixing screws 9A shown in the schematic side view of Figure 3(b) and the schematic front view of Figure 3(c). The support beam 7 is made of an aluminum frame or the like, and a block ramper 8A is installed on it, which forms the base of the shuttle platform 8 that moves back and forth on the support beam 7.

As shown in the schematic top view of FIG. 4(a) and the schematic front view of FIG. 4(b), a rotating jig 8B, which serves as a rotation mechanism and forward/backward mechanism, is attached to a block ramp 8A on a support beam 7 so as to be rotatable and movable forward/backward on a shaft 8C that extends horizontally and is perpendicular to the axis of the rolling roll 2. A base to which one end of the shaft 8C is fixed is screwed to the block ramp 8A.

As shown in the schematic front view of FIG. 5, the rotating jig 8B is moved to the rear end of the shaft 8C (in the direction away from the rolling roll 2). The housing 6 housing the controller 5 is attached so as to be suspended from the rotating jig 8B, and fixed with the fixing screw 9A.

Next, as shown in the schematic front view of FIG. 6, the rotating jig 8B is rotated and positioned so that the housing 6 housing the controller 5 is on top. The housing 6 housing the displacement sensor 4 is attached so as to be suspended from the rotating jig 8B, and fixed with fixing screws 9A. The displacement sensor 4 and the controller 5 are then connected with a cable 10, which is then tied down with a hook-and-loop fastener or the like.

(Advance/retraction and rotation mechanism)
During measurement, the rotating jig 8B is fixed at the forward limit (in the direction approaching the rolling roll 2) on the block lumber 8A side of the shaft 8C. The rotating jig 8B can be loosened to switch the top and bottom of the housing 6 (FIG. 7). It can be fixed with a pin every time it rotates 90°.
The rotating jig 8B is positioned by moving it closer to or away from the rolling roll 2 along the shaft 8C.

(Scanning mechanism)
The block ramper 8A positioned on the support beam 7 is loosened and moved to an arbitrary position (in a direction parallel to the roll axis of the rolling roll 2), and then the block ramper 8A is fixed (FIG. 7).

(Surface roughness measurement method)
The displacement sensor 4 is moved to an arbitrary position by the forward/backward and rotating mechanism or the scanning mechanism, and then the distance from the displacement sensor 4 to the surface of the rolling roll 2 is measured. Thereafter, the displacement sensor 4 is moved to a predetermined position and the measurement is repeated. As shown in Fig. 8(a), it is preferable to make the measurement range continuous in the roll axis direction. After the measurement of one roll is completed, it is preferable to flip the housing 6 upside down and measure the other roll.

The surface roughness of the rolling roll (work roll) after hot rolling was measured using the above-mentioned surface roughness measuring device in the example of the invention, and compared with the conventional method in which a replica of the roll surface was taken using silicone resin. In the example of the invention, measurements were taken continuously in the roll axial direction as shown in Figure 8 (A). In the conventional method, replicas were taken at seven locations in the roll axial direction. The surface roughness was evaluated by line analysis with a length of 25 mm and the maximum height difference Rz. In the results of Figure 9, the examples of the invention are shown with circles and solid lines, and the conventional examples with crosses and dashed lines. The measurement positions were compared at the replica taking positions. From the results of Figure 9, it can be seen that there is no difference in the measured values of the examples of the invention and the conventional examples. On the other hand, the examples of the invention can complete the measurement in 1/4 the time of the conventional examples, and the parameters of the surface roughness can also be utilized in the examples of the invention. The examples of the invention can be said to be a highly accurate and efficient measurement method.

REFERENCE SIGNS LIST 1 Surface roughness measuring device 2 Rolling roll 3 Chock 3A Spacer (of chock) 4 Displacement sensor 5 Controller 6 Housing 7 Support beam 8 Carriage 8A Block clamper 8B Rotation jig (of rotation mechanism and forward/backward mechanism) 8C Shaft 9 Fixing jig 9A Fixing screw 10 Cable 11 Measurement position (by surface roughness measuring device) 12 Collection position (of replica)

Claims (8)

A surface roughness measuring device for measuring the surface roughness of a rolling roll, comprising:
a displacement sensor having a detection portion facing a surface of the rolling roll and measuring a distance to the roll surface of the rolling roll;
A controller for the displacement sensor;
a housing for housing the displacement sensor and the controller;
A support beam that supports the housing;
a carriage to which the housing is fixed and which is movable back and forth on the support beam in a direction parallel to the axial direction of the rolling roll;
A fixing jig for fixing the support beam to a chock for fixing the rolling roll;
a rotation mechanism that rotates the housing on a vertical plane including a line parallel to the axial direction of the rolling roll, with the carriage position serving as a rotation axis;
A surface roughness measuring device comprising: Further, a reciprocating mechanism is provided for reciprocating the housing toward and away from the surface of the rolling roll.
The surface roughness measuring device according to claim 1 . a housing for separately accommodating the displacement sensor and the controller is disposed on either side of a carriage;
The housing has a heat-resistant block on the side of the rolling roll.
The surface roughness measuring device according to claim 1 . The controller has a function of calculating surface data of the rolling roll surface based on the surface displacement data measured by the displacement sensor.
The surface roughness measuring device according to claim 1 . The calculation function has a function of calculating parameters of surface roughness.
5. The surface roughness measuring device according to claim 4. The displacement sensor has a function of measuring a displacement amount in a two-dimensional area.
The surface roughness measuring device according to claim 1 . The surface roughness measuring device according to any one of claims 1 to 6 is fixed to a chock of a rolling roll after rolling,
detecting the roughness of the surface of the roll while moving the displacement sensor parallel to the axial direction of the roll;
Surface roughness measurement method. After measuring the surface roughness of one of the rolling rolls, the displacement sensor is rotated around the position of the carriage in a vertical plane as an axis, and the surface roughness of the other rolling roll is measured.
The surface roughness measuring method according to claim 7.

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