JPH044066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the inner diameter dimension of a mold for a round billet continuous casting machine.

In recent years, attempts have been made to manufacture round billets as materials for seamless pipes using continuous casting machines. In this case, there are the following problems. That is, the thickness of the solidified shell formed by the molten steel from the tundish coming into contact with the inner surface of the mold and being cooled becomes thicker toward the bottom of the mold. As the thickness of the solidified shell increases, the amount of shrinkage due to cooling increases, so the gap formed between the solidified shell and the inner surface of the mold is
It becomes wider towards the bottom of the mold. If the gap widens, the cooling ability of the solidified shell will be reduced, and the solidified shell will not be formed properly, which will hinder the casting of a sound round billet.

Therefore, in order to solve the above-mentioned problems, a tapered mold with a downwardly tapered shape, in which the inner diameter is reduced by an amount commensurate with the amount of contraction of the solidified shell, has been developed and has been effective.

When manufacturing the above-mentioned taper mold, it is particularly important to measure the inner diameter dimension of the manufactured mold in order to check whether the inner surface shape of the mold is finished as designed.

Conventionally, the inner diameter dimension of a mold has been measured manually using a measuring tool such as an inside micrometer or various types of gauges.

However, manual methods not only take time and effort, but also have large measurement errors, and moreover, it is nearly impossible to measure the inner diameter dimension at the same location after a certain period of time has elapsed, which is done to examine changes in the inner surface shape over time. These problems are particularly noticeable in the case of curved molds.

From the above-mentioned viewpoints, the present invention allows the inner diameter dimension of a mold to be measured accurately and in a short time, and even when measuring again after a certain period of time, it is possible to measure the same location as the previous measurement location. The present invention provides a device for measuring the inner diameter dimension of a mold for a round billet continuous casting machine, in which a distance detector having a rod whose tip contacts the inner surface of the mold can be freely moved in the vertical, horizontal, and front-back directions. The rod is movable, and the inner diameter of the mold is calculated by a controller based on the minimum value of the distance signals detected by moving the rod in the vertical direction.

One embodiment of this invention will be described with reference to the drawings.

FIG. 1 is a partially omitted perspective view of one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a first movable cart having an opening 1' formed in its center. The first movable cart 1 is freely moved by a first driving means 4 on a rail 3 fixed to the upper surface of a base 2 in parallel in the left-right direction. The first driving means 4 includes:
It is composed of a first motor 5 attached to a base 2 and a horizontal feed screw 6 rotated by the first motor 5, and the feed screw 6 is screwed into a female screw plate 7 fixed to the first movable cart 1. Reference numeral 8 denotes a second movable cart having an opening 8' formed in its center. Second moving trolley 8
A rail 9 is fixed to the upper surface of the first movable cart 1 in parallel in the front-back direction perpendicular to the rail 3.
The second driving means 10 moves the upper part freely. The second driving means 10 is composed of a second motor 11 attached to the first movable cart 1 and a horizontal feed screw 12 rotated by the second motor 11, and the feed screw 12 is a female motor fixed to the second movable cart 8. screw plate 1
It is screwed into 3. Reference numeral 14 denotes an elevating table, and the elevating table 14 is freely raised and lowered by the third driving means 16 along guide columns 15 fixed perpendicularly to each corner of the second driving means 10. The third driving means 16 includes a third motor 18 attached to a fixed plate 17 horizontally fixed to the upper end of the guide column 15, and a vertical feed screw 19 rotated by the third motor 18. It is screwed onto the base 14. 20 is an elevator. The elevator pipe 20 is vertically fixed to the lower center of the elevator platform 14 through openings 1' and 8' formed in the first moving truck 1 and the second moving truck 8. 21 is the elevator pipe 20
The pivot shaft 21 is a pivot shaft installed concentrically inside the pivot shaft 21, and the pivot shaft 21 is freely pivoted about the axis by the fourth driving means 22. Fourth driving means 22
is composed of a fourth motor 23 attached to the lifting table 14 and a gear mechanism (not shown). 24
is a distance detector attached to the lower end of the pivot shaft 21 via a horizontal shaft 25. At the front end of the distance detector 24, a rod 24a to which a protruding force is constantly applied by a spring or the like is attached so as to be able to move forward and backward, and the forward and backward distance of the rod 24a can be continuously output as an electric signal. It's summery. The distance detector 24 is moved up and down about the horizontal axis 25 by a fifth driving means 26 . The fifth driving means 26 includes a fifth motor 27 attached to the lifting platform 14.
and a wire 28 that is pulled and pushed by this. The tip of the wire 28 is fixed to the rear end of the distance detector 24. Therefore, when the fifth motor 27 is driven, the rod 24a moves up and down within a predetermined angular range. As shown in FIG. 2, the wire 28 is inserted into a flexible tube 29 made of tightly wound steel wire into a pipe shape.

Said first to fifth driving means 4, 10, 16, 22
It goes without saying that and 26 are not limited to the structure described above.

The first motor 5, the second motor 11, the third motor 18, the fourth motor 23, and the fifth motor 27
are each controlled by a controller (not shown).

Next, a case will be described in which the inner diameter dimension of a curved taper mold is measured by the inner diameter dimension measuring apparatus of the present invention configured as described above.

First, directly above the vertically fixed mold 30,
Install the above measuring device. At this time, the first and second movable carts 1 and 8 of the measuring device are located at the reference point. Next, the first and second motors 5 and 11 are driven to move the first and second movable carts 1 and 8 to predetermined positions, respectively. After that, the third motor 18 is driven and the lifting platform 14 is
The distance detector 2 attached to the tip of the pivot shaft 21
4 is lowered until it is located at an appropriate height within the mold 30. After this, as shown in FIG. 3, the distance detector 2 drives the fifth motor 27.
The rod 24a of No. 4 is moved vertically by a predetermined angle (θ) about the horizontal axis 25. rod 24a
Since the tip of the rod is always in contact with the inner surface of the mold during the movement, the distance detector 24 can detect the axis of the pivot shaft 21 and the rod 24 at the appropriate height position.
An electrical signal corresponding to the distance from the tip of a is continuously output to the controller. The controller calculates and stores the minimum distance (lmin) between the axis of the rotating shaft 21 and the tip of the rod 24a at the appropriate height position based on the smallest electrical signal among the electrical signals that are continuously sent. do. Next, the fourth motor 23 is driven to rotate the rod 24a by a predetermined angle (for example, 5 degrees) from the previous position. The controller calculates and stores the minimum distance at this time based on the minimum electrical signal detected in the same manner as the previous time. The controller calculates the amount of positional deviation between the axis of the rotation shaft 21 and the center of the upper end of the mold 30 based on a plurality of distance data (72 when detected at 5° intervals) calculated in this way. , the first motor 5 and the second motor 11 are driven so that the axis line coincides with the center.

As mentioned above, the reason why the rod 24a is moved up and down is as follows. That is, mold 30
Since the axis of the rod 24a is curved in an arc, when the distance detector 24 is fixed at right angles to the vertical rotation axis 21 and rotated at predetermined angular intervals, the rod 24a
The trajectory drawn by the tip of is an ellipse. Therefore, the controller needs to calculate, for example, the amount of positional deviation of the axis of the rotation shaft 21 as described above, based on the data on the diameter of the ellipse from the distance detector 24. This calculation is extremely complex and necessarily requires a controller with a large amount of calculation capacity. On the contrary,
As mentioned above, by moving the rod 24a up and down,
If the distance is calculated based on the minimum electrical signal detected, this distance becomes the inner diameter of the circle, so data processing by the controller is much simpler than in the case of an ellipse, and as a result, the controller is relatively simple. This is because it only needs to have a small amount of computing power.

As described above, once the position of the pivot shaft 21 has been corrected, the third motor 18 is driven to lower the distance detector 24 to a preset height within the mold 30.

Next, by performing the same operation as described above, the inner diameter dimension of the mold 30 at the preset height position is calculated. In this case, since the mold 30 is curved, even if the pivot shaft 21 is vertically lowered, the center of vertical movement of the rod 24a does not coincide with the axis of the mold 30. Therefore, the distance detector 24 outputs to the controller a plurality of minimum electrical signals corresponding to the distance between the position offset from the axis of the mold 30 and the tip of the rod 24a. The controller calculates the inner diameter dimension of the mold 30 at the preset height position based on these minimum electrical signals, but the controller calculates the inner diameter dimension when the center of vertical movement of the rod 24a is mold 3
Correct the calculation result of the mold inner diameter dimension when it coincides with the zero axis.

Furthermore, if the pivot shaft 21 is not exactly perpendicular to the mold 30 but is inclined, the mold inner diameter cannot be accurately measured. Therefore, in this case as well, the controller further corrects the calculation result so that it becomes the calculation result when the pivot axis 21 becomes exactly perpendicular to the mold 30. Thereby, the mold inner diameter dimension can be accurately measured even in the case described above.

In this way, the inner diameter dimensions at a plurality of predetermined locations of the mold 30 are measured.

The above explanation is for the case where the measuring device of the present invention is applied to measuring the inner diameter dimension of a curved taper mold, but it goes without saying that the measuring device of the present invention can be applied to other molds for round billets. be.

According to this invention, it is possible to measure the inner diameter of a mold for round billets extremely accurately and in a short time, and even when measuring again after a certain period of time, it is possible to measure the inner diameter of a mold for a round billet in exactly the same place as the previous time. Since measurements can be performed, various useful effects can be brought about, such as being able to accurately grasp changes in the inner shape of the mold over time.

[Brief explanation of drawings]

FIG. 1 is a partially omitted perspective view of an embodiment of the present invention, FIG. 2 is an enlarged view of a flexible tube portion, and FIG. 3 is a diagram showing a distance detection state using a rod.
In the drawings, 1...first moving cart, 1'...opening, 2...base, 3
...Rail, 4...First driving means, 5...First motor,
6...Horizontal feed screw, 7...Female screw plate, 8...Second moving cart, 8'...Opening, 9...Rail, 10...Second driving means, 11...Second motor, 12...Horizontal feed screw,
13...Female screw plate, 14...Elevating platform, 15...Guide column, 16...Third driving means, 17...Fixing plate, 18...
Third motor, 19... Vertical feed screw, 20... Lifting pipe, 21... Rotating shaft, 22... Fourth drive means, 23...
4th motor, 24...distance detector, 24'...rod,
25...Horizontal axis, 26...Fifth driving means, 27...Fifth
Motor, 28...Wire, 29...Flexible tube, 30...Mold.

Claims (1)

[Scope of Claims] 1. A first movable trolley that freely moves on a rail fixed in the left-right direction on a base; a first driving means for moving the first movable trolley; and the first movable trolley. a second movable dolly that freely moves on a rail fixed on the first movable dolly in the front-rear direction perpendicular to the rail; a second driving means for moving the second movable dolly; and the second movable dolly. a lifting platform that is freely raised and lowered along a guide column vertically fixed on a movable cart; a third drive means for raising and lowering the lifting table; a pivot shaft vertically attached to a lower part of the lifting table; A fourth drive means for rotating the pivot shaft about its axis, and a rod that freely advances and retreats so that its tip always contacts the inner surface of the mold, and is attached to the lower end of the pivot shaft via a horizontal shaft. a distance detector; a fifth drive means for moving the distance detector in the vertical direction about the horizontal axis; and a control command for the first, second, third, fourth, and fifth drive means. An apparatus for measuring the inner diameter dimension of a mold for a round billet continuous casting machine, characterized in that it is comprised of a calculator that calculates the inner diameter dimension of the mold based on the electric signal from the distance detector.