JPS6359447B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a roll shape measuring method,
More specifically, the present invention relates to a method of measuring roll shape on a roll grinder.

In the present invention, the term "roll shape" is used to collectively refer to both roll profile and cylindricity.

As is well known, roll grinding by a roll grinder is performed by rotating the roll 1 at a predetermined rotation speed and rotating the grindstone 2 mounted on the carriage 4 of the roll grinder 6, as shown in FIG.
By moving the carriage 4 over the bed 5 in the direction of the arrow while in contact with the roll, the entire circumference of the roll is ground.

The reciprocation of the carriage 4 is set within a range in which the grinding wheel 2 does not completely separate from the end face of the roll 1. Generally, a method in which about 1/3 of the grinding wheel width protrudes from both end faces of the roll body length improves grinding accuracy and grinding efficiency. It is said to be the most preferable from this point of view.

However, the conventionally known roll profile measurement is performed by arranging the detection sensor 3 on the same side of the roll grinder 6 as the grinding wheel 2, as shown in FIG. It was not possible to measure the diameter difference between the two ends of the part. For this reason, cylindricity is actually measured by measuring the diameters at both ends with a hand micrometer and reading the difference.

However, measurement using a micrometer has a large measurement error for the following reasons.

If you hold the frame of a micrometer in your hand, your body temperature will cause the frame to stretch, resulting in a measurement error.

Among the rolls, rolls for hot rolling mills have a large diameter, and the micrometer used to measure them is also large and heavy, so measurement requires skill and has large variations depending on the measurer.

Regarding the total error of a micrometer, the longer the maximum measurement length, the larger the allowable error becomes.

However, in the case of rolling rolls, the accuracy of cylindricity has a great effect on the threadability in the rolling mill.
Accurately measuring and controlling the cylindricity of rolls is an important point in rolling operations.

The present invention has been made to advantageously solve these problems, and its gist is that when measuring the roll shape on a roll grinding table, the shape detection sensor is placed directly opposite the point of contact between the grinding wheel and the roll. point (including a range of 15 degrees above and below the point 180 degrees opposite to the point of contact between the grinding wheel and the roll) and in contact with the center of the grinding wheel width, and synchronizing the shape detection sensor with the carriage to detect the roll cylinder. The present invention relates to a method for measuring roll shape, which is characterized in that measurement is performed by moving the roll in the longitudinal direction.

The present invention will be explained in detail below based on the drawings.

In a roll grinder, as shown in Fig. 3, points A, B, and points A to B on the long end surface of the roll body are
When the grinding wheel drive motor amperage between points becomes the same, it can be judged that grinding has finished. At this stage, in the case of flat grinding, the carriage 4 and the roll surface facing the carriage 4 are kept parallel to each other. It's summery.
Further, in crowning grinding, the distances between arbitrary equidistant points A' and B' from the long end surface of the roll cylinder and the carriage 4 are kept the same.

On the other hand, there is no guarantee that a point equidistant from the roll surface or roll end surface on the opposite side is parallel to the carriage 4 or equidistant from the carriage 4.

Based on this fact, the present invention automatically measures not only the roll profile but also the cylindricity, which previously had to be done manually, by measuring the cylindrical surface of the roll on the opposite side of the grindstone at 180 degrees in the lengthwise direction. It has been discovered that it can be measured accurately and accurately.

Next, FIG. 2 shows the arrangement of shape detection sensors for carrying out the measuring method of the present invention.

That is, the shape detection sensor 3 is supported at one end by an arm 7 directly connected to the carriage 4, and is placed in contact with the cylindrical surface of the roll 1 on the opposite side of the contact point between the grindstone 2 and the roll 1 by 180 degrees. 8 in the figure is shape detection sensor 3
This is a cable that connects the detection signal to an XY recorder or digital display.

The reason why the range is set at 15 degrees above and below the point 180 degrees opposite to the point of contact between the grinding wheel 2 and the roll 1 is that measurement accuracy deteriorates when the angle exceeds 15 degrees.

Next, the reason why the shape detection sensor is placed in the center of the grinding wheel width and moved in synchronization with the grinding wheel is that when grinding with a roll grinder, the grinding wheel is moved from the end face of the roll cylinder to one part of the grinding wheel width. This is to adopt a grinding method in which the grinding wheel protrudes by about 1/3 inch, so that when the grinding wheel 2 moves in the lengthwise direction of the roll body, the shape detection sensor 3 always reaches a predetermined position at the end of the roll cylindrical surface, and the distance from the end surface is The left and right sides can be set the same, which allows accurate measurement of cylindricity.

The measuring method of the present invention can be performed at any stage during grinding or after the end of grinding, and the roll shape can be measured extremely easily and with high precision. Even if a grinding defect occurs, it can be detected early and can be repeated. Grinding and correction grinding can be performed while measuring and confirming the roll shape during grinding, significantly improving grinding accuracy.

In addition, as the shape detection sensor, model No. E-DP-95A manufactured by Tokyo Seimitsu Co., Ltd. or one equivalent thereto can be adopted.

During measurement, it is preferable to cover the arm supporting the shape detection sensor with a heat insulating material in advance to prevent thermal expansion and contraction of the arm to improve measurement accuracy.

Next, specific merits will be listed when a roll measured and ground by the measuring method of the present invention is installed in a steel strip hot rolling mill and rolled.

Compared to using rolls whose cylindricity was measured using a conventional hand micrometer, when using rolls ground by the measuring method of the present invention, the number of rolls to be temporarily replaced due to narrowing is 1/3. It decreased sharply to below. This means that the measurement accuracy of cylindricity has become extremely accurate, so in rolling operations,
This is because the rolling mill settings could be made based on this more accurate information.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of a roll grinder and is an explanatory diagram showing the conventional roll profile measuring method.
3 are explanatory diagrams showing the roll shape measuring method of the present invention, FIG. 2 is a sectional view, and FIG. 3 is a schematic plan view. 1: Roll, 2: Grindstone, 3: Detection sensor,
4: Carriage table, 5: Bed, 6: Roll grinder, 7: Arm.

Claims (1)

[Claims] 1. When measuring the roll shape on a roll grinding table, place the shape detection sensor at a point 180 degrees opposite the point of contact between the grinding wheel and the roll, and at a point exactly opposite to the point that is 15 degrees up and down, and in contact with the center of the width of the grinding wheel. A method for measuring a roll shape, characterized in that the shape detection sensor is moved in the longitudinal direction of the roll body in synchronization with a carriage.