Surface roughness measuring apparatus and surface roughness measuring method

Abstract

To provide a surface roughness measurement technique that can directly measure the surface roughness of a pressure roll after rolling and measure the surface roughness with high accuracy in a short time.SOLUTION: A surface roughness measurement device which measures the surface roughness of a pressure roll includes: a displacement sensor in which a detection part is opposed to the surface of the pressure roll and which measures a distance to a roll surface of the pressure roll; a controller of the displacement sensor; a housing which stores the displacement sensor and the controller; a support beam which supports the housing; a reciprocating stand to which the housing is fixed and which can reciprocate parallel to the axial direction of the pressure roll on the support beam; a fixture which fixes the support beam to a chock that fixes the pressure roll; and a rotation mechanism which rotates the housing on a vertical surface including a line parallel to the axial direction of the pressure roll with the position of the reciprocating stand as the rotation axis.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a surface roughness measuring device and a surface roughness measuring method for detecting the surface roughness of a roll surface of a rolling roll such as a hot rolling roll.

Background Art

[0002] In the conventional surface inspection of rolling rolls, a method called ultrasonic flaw detection has been used. In ultrasonic flaw detection, an ultrasonic probe is held at a certain distance from the surface of an object, and ultrasonic waves are propagated from the ultrasonic probe to the object through an acoustic coupling medium to detect defects existing on the surface or directly below the surface of the object (see, for example, Patent Document 1).

[0003] In addition, as a roll surface defect detection device, there is also a method in which a single light source is irradiated, and a linear sensor or an area sensor that detects the reflected or diffused light is used, and the surface defects of the roll to be inspected are detected by processing the sensor output (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the prior art has the following problems. In the technologies 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 relationship between load-bearing capacity and weight. Therefore, a replica was created by taking a mold of the rolling roll surface, and the roughness of the unevenness copied onto the replica was measured. There was a problem that it took time for the softened resin to harden in creating the replica.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a surface roughness measuring apparatus and a surface roughness measuring method capable of directly measuring the surface roughness of a rolling roll after rolling and measuring high-precision surface roughness in a short time.

Means for Solving the Problems

[0007] The surface roughness measuring apparatus according to the present invention that advantageously solves the above problems is a surface roughness measuring apparatus for measuring the surface roughness of a rolling roll, including a displacement sensor in which a detection unit faces the surface of the rolling roll and measures the distance to the roll surface of the rolling roll, a controller of the displacement sensor, a housing that houses the displacement sensor and the controller respectively, a support beam that supports the housing, a reciprocating table on which the housing is fixed and can reciprocate parallel to the axial direction of the rolling roll, a fixing jig that fixes the support beam to a chuck 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 reciprocating table as a rotation axis.

[0008] Note that the surface roughness measuring apparatus according to the present invention (a) further includes a reciprocating mechanism that moves the housing forward and backward toward the surface of the rolling roll, (b) the housings that separately house the displacement sensor and the controller are arranged with the reciprocating table in between, and the housing has a heat-resistant block on the side of the rolling 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 the displacement amount in a two-dimensional region, etc. can be more preferable solutions.

[0009] The surface roughness measurement method according to the present invention, which advantageously solves the above problems, is characterized in that any one of the above surface roughness measuring devices is fixed to the chuck 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.

[0010] In addition, in the surface roughness measurement method according to the present invention, after measuring the surface roughness of one rolling roll, it is more preferable to rotate the displacement sensor about the position of the reciprocating table in the vertical plane to measure the surface roughness of the other rolling roll.

Advantages of the Invention

[0011] According to the surface roughness measuring device and the surface roughness measurement method of the present invention, the surface roughness of the rolling roll can be measured directly after rolling. It can be measured in a shorter time with non-contact and with the same accuracy as a mold release replica, and the surface roughness can be measured without gaps in the roll axial direction.

Brief Description of the Drawings

[0012]

Figure 1

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Figure 9

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be specifically described. Note that each drawing is schematic and may differ from the actual one. Further, the following embodiments illustrate facilities and methods for embodying the technical idea of the present invention, and do not specify the configuration to the following. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

[0014] FIG. 1 is a schematic front view showing an overview of a surface roughness measuring device according to an embodiment of the present invention. FIGS. 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 the present embodiment is fixed to a chuck 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 includes a displacement sensor 4, a controller 5 of the displacement sensor 4, a housing 6, a support beam 7, a reciprocating table 8, a fixing jig 9, and a rotation mechanism provided on the reciprocating table 8. Further, it is preferable to include a reciprocating mechanism that advances and retracts the housing 6 toward the surface of the rolling roll 2.

[0015] The displacement sensor 4 is installed on the surface of the rolling roll 2 with the detection part facing it, and has the function of measuring the distance to the surface of the rolling roll 2. The displacement sensor 4 has the function of measuring the displacement amount in a two-dimensional area. The controller 5 is provided with an arithmetic function for the surface data of the surface of the rolling roll 2 based on the surface displacement data measured by the displacement sensor 4. The arithmetic function has the function of calculating the parameters of the surface roughness. As the parameters of the surface roughness, the arithmetic mean roughness Sa, the maximum peak height Sp, the maximum valley depth Sv, the maximum height Sz which is the sum of Sp and Sv, etc. can be used.

[0016] The housing 6 houses the displacement sensor 4 and the controller 5 respectively, and is fixed to the reciprocating table 8. The displacement sensor 4 and the controller 5 are connected by a cable 10 so that commands and measurement data can be communicated. The cable 10 is preferably fastened to the fixture of the housing 6 to the reciprocating table 8 with a surface fastener or the like. Further, the housing 6 that houses the displacement sensor 4 has a heat-resistant block on the side of the rolling roll 2. It is possible to protect the displacement sensor 4 from the heat from the high-temperature rolling roll 2 after rolling.

[0017] Both ends of the support beam 7 are respectively fixed to the chucks 3 located at both axial ends of the rolling roll 2 by fixing jigs 9. The reciprocating table 8 is installed on the support beam 7 so as to be reciprocally movable parallel to the axial direction of the rolling roll 2. The reciprocating table 8 can rotate about the position of the reciprocating table 8 with the housing 6 arranged with the reciprocating table 8 in the middle as the axis. The rotation is performed by a rotation mechanism on a vertical plane including a line parallel to the axial direction of the rolling roll 2.

[0018] (Assembly mechanism) Hereinafter, the procedure for assembling the surface roughness measuring device 1 according to the present embodiment so that the surface roughness of the rolling roll 2 can be measured after rolling will be described. As shown in the upper surface schematic view in FIG. 2, the groove-shaped fixing jig 9 is fixed with fixing screws 9A so as to sandwich the spacers 3A of each of the pair of chucks 3. As the fixing screw 9A, a bolt with a hexagonal hole or the like can be used. The same applies hereinafter.

[0019] As shown in the top view of FIG. 3(a), both ends of the support beam 7 are fixed to the fixing jig 9 with screws. Fixing is performed with the fixing screws 9A shown in the side view of FIG. 3(b) and the front view of FIG. 3(c). The support beam 7 is composed of an aluminum frame or the like, and a block runner 8A that serves as the base for the reciprocating table 8 that reciprocates on the support beam 7 is installed.

[0020] As shown in the top view of FIG. 4(a) and the front view of FIG. 4(b), a rotary jig 8B as a rotation mechanism and a reciprocating mechanism is attached to the block runner 8A on the support beam 7 so as to be rotatable and reciprocally movable on a shaft 8C that extends horizontally and is orthogonal to the axis of the rolling roll 2. The pedestal with one end of the shaft 8C fixed is fixed to the block runner 8A with screws.

[0021] As shown in the front view of FIG. 5, the rotary jig 8B is moved to the retracted limit of the shaft 8C (in the direction away from the rolling roll 2). The housing 6 that houses the controller 5 is attached so as to be suspended from the rotary jig 8B and fixed with the fixing screws 9A.

[0022] Next, as shown in the front view of FIG. 6, the rotary jig 8B is rotated and positioned so that the housing 6 that houses the controller 5 is on top. The housing 6 that houses the displacement sensor 4 is attached so as to be suspended from the rotary jig 8B and fixed with the fixing screws 9A. Then, the displacement sensor 4 and the controller 5 are connected with a cable 10, and the cable 10 is tied up with a hook-and-loop fastener or the like.

[0023] (Advancing / retracting and rotating mechanism) During measurement, the rotary jig 8B is fixed at the forward limit on the block runner 8A side of the shaft 8C (in the direction approaching the rolling roll 2). The rotary jig 8B can be loosened, and the top and bottom of the housing 6 can be swapped (FIG. 7). It can be fixed with pins every 90° rotation. The rotary jig 8B is positioned by moving it closer to or away from the rolling roll 2 along the shaft 8C.

[0024] (Scanning mechanism) Loosen the block clamp 8A positioned on the support beam 7, move it to an arbitrary position (in a direction parallel to the roll axis of the rolling roll 2), and then fix the block clamp 8A (Fig. 7).

[0025] (Surface roughness measurement method) After moving the displacement sensor 4 to an arbitrary position by means of a reciprocating and rotating mechanism or a scanning mechanism, measure the distance from the displacement sensor 4 to the surface of the rolling roll 2. Then, move it to a predetermined position and repeat the measurement. As shown in Fig. 8(a), it is preferable to make the measurement range continuous in the roll axis direction. After measuring one roll, it is preferable to turn the housing 6 upside down and measure the other roll.

Example

[0026] The surface roughness of the rolling roll (work roll) after hot rolling was measured using the above surface roughness measuring device and compared with the conventional method of collecting a replica of the roll surface using a silicone resin. In the inventive example, the measurement was performed continuously in the roll axis direction as shown in Fig. 8(A). In the conventional method, replicas were collected at seven positions in the roll axis direction. The surface roughness was evaluated as a line analysis of a length of 25 mm and the difference in maximum height Rz. The results in Fig. 9 show the inventive example with ○ marks and solid lines and the conventional example with × marks and broken lines. The measurement positions were compared at the replica collection positions. It can be seen from the results in Fig. 9 that there is no difference in the measured values between the inventive example and the conventional example. On the other hand, the inventive example can complete the measurement in 1 / 4 of the time of the conventional example, and in the inventive example, the parameters of the surface roughness can also be utilized. The inventive example can be said to be a highly accurate and efficient measurement method.

Explanation of reference numerals

[0027] 1 Surface roughness measuring device 2 Rolling roll 3 Chuck 3A Spacer (of the chuck) 4 Displacement sensor 5 Controller 6 Housing 7 Support beam 8 Reciprocating table 8A Block clamp Rotating jig (for the rotating mechanism and the advancing / retreating mechanism) 8C Shaft 9 Fixed jig 9A Fixing screw 10 Cable 11 Measuring position (by the surface roughness measuring device) 12 Sampling position (of the replica)

Claims

1. A surface roughness measuring device for measuring the surface roughness of a rolling roll, a displacement sensor in which a detection unit faces the surface of the rolling roll and measures the distance to the roll surface of the rolling roll, a controller of the displacement sensor, a housing that houses the displacement sensor and the controller respectively, a support beam that supports the housing, a reciprocating table on which the housing is fixed and can reciprocate parallel to the axial direction of the rolling roll on the support beam, a fixing jig that fixes the support beam to a chuck that fixes 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 position of the reciprocating table as the rotation axis, A surface roughness measuring device comprising:

2. Further comprising a reciprocating mechanism for moving the housing forward and backward toward the surface of the rolling roll, The surface roughness measuring device according to claim 1.

3. The housing that houses the displacement sensor and the controller separately is arranged with the reciprocating table in between, The housing has a heat-resistant block on the side of the rolling roll, The surface roughness measuring device according to claim 1.

4. 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.

5. The calculation function has a function of calculating parameters of surface roughness, The surface roughness measuring device according to claim 4.

6. The displacement sensor has a function of measuring the displacement amount in a two-dimensional region, The surface roughness measuring device according to claim 1.

7. Fix the surface roughness measuring device according to any one of claims 1 to 6 to the chuck of the rolling roll after rolling, Detect the roughness of the surface of the rolling roll while moving the displacement sensor parallel to the axial direction of the rolling roll. A surface roughness measuring method.

8. After measuring the surface roughness of one rolling roll, rotate the displacement sensor about the position of the reciprocating table in the vertical plane to measure the surface roughness of another rolling roll. The surface roughness measuring method according to claim 7.

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