JPS6046849A - Apparatus for measuring inside diametral size of mold for continuous casting machine of round billet - Google Patents

Abstract

PURPOSE:To know quickly and exactly the inside diameter of a continuous casting mold by attaching a rod with a distance detector to the top end of a lifting pipe suspended from a lifting base which moves longitudinally, transversely and vertically over a base plate, swiveling and tilting the rod and calculating the detection signal. CONSTITUTION:A lifting pipe 20 on a base plate 2 is moved longitudinally by the 1st motor 5, transversely by the 2nd motor 11 and vertically by the 3rd motor 18. A distance detector 24 provided at the top end of the pipe 20 is swiveled by the 4th motor 22 and is tilted by the 5th motor 27 and a wire 28. the distance detector 24 is put into a mold by the operation of said motors and the position of the inside surface thereof is measured and calculated, by which the condition such as the inside diameter, bend, etc. is quickly and exactly known.

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 crush round billets as raw materials for seamless pipes using continuous casting machines. In this case, there is a first-order problem. That is.

Ie of the solidified shell formed when the molten steel from the tanditsu comes into contact with the inner surface of the mold and is cooled.
The thickness becomes thicker toward the bottom of the mold. Solidified shell V, 15. As the thickness increases, cooling
=IIK shrinkage (1;) increases, so the gap formed between the solidified shell and the mold inner surface becomes wider toward the bottom of the mold.As the gap widens, the cooling ability of the solidified shell decreases. , the formation of a solidified shell is not performed well, which causes problems in the construction of a healthy round billet.

Therefore, in order to solve the above-mentioned problem, the inner diameter dimension is reduced by the amount found in the shrinkage 111 of the solidified shell.
A tapered mold with a tapered bottom has been developed and is showing great results.

When manufacturing the tapered mold described in I-, it is particularly important to measure the inner diameter dimension of the mold after manufacturing in order to check whether the inner shape of the mold conforms to the designed shape. It is.

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

However, the one-man method is not only time-consuming and labor-intensive, but also has a large measurement error, and it is also possible to measure the inner diameter dimension at the same point after a certain period of time to check for changes in the inner surface shape over time. These problems appear in the case of curved molds.

From the above-mentioned viewpoints, this invention enables accurate and quick measurement of the inner diameter of a mold! Maybe LL.

When measuring again after a certain period of time has elapsed, it is possible to measure the same location as the previous measurement location. The present invention provides an apparatus for measuring the inner diameter dimension of a mold for a round billet continuous casting machine.

A distance detector having a rond whose tip contacts the inner surface of the mold can be freely moved up and down, right and left, and front and rear directions, and based on the minimum value of the distance signal detected by moving the rond in the up and down direction. , is characterized in that the inner diameter dimension of the mold is calculated by a controller.

4- One embodiment of the present invention will be described with reference to the drawings.

Figure i+: + is a partially omitted perspective view of an embodiment of the present invention. In FIG. 1, 1 has an opening D 1 in the center.
1. ' is formed on the moving ν1 bogie. The first movable platform 2 is moved parallel to the left and right direction on the rail 3 of the base 2.
It moves freely by the driving means 4. The third driving means 4 is composed of a third motor mounted on the base 2 and a horizontal feed screw 6 rotated by the third motor, and the feed screw 6 is a female screw fixed to the first movable cart 1. It is screwed onto plate 7. 8 i'lJ: An opening 8' is formed in the center/this is the second movable table. The second movable trolley 8 is mounted on a rail 9 fixed to the upper surface of the first movable trolley in a row extending in the front-rear direction perpendicular to the rail 3.

', 'p, 2 drive means] Move freely by O.

The second driving means] - 〇, No.] Attached to the mobile cart 1 /ζQ(') 2 motor] - and a horizontal feed screw rotated by the motor 2, and the feed screw 12 is.

It is screwed into a female thread 13 fixed to the second moving uΦ8. Reference numeral 14 denotes an elevating table, and the elevating table]-4 is freely raised and lowered by the third drive means]6 along guide columns 15 identified perpendicularly to each corner of the second movable cart 10. The third driving means 16 is.

It consists of a fixed plate fixed horizontally to the upper end of the guide column 15]-8 attached to the third motor]-8, and a vertical feed screw 19 rotated thereby. They are screwed together. 20 is.

It is an elevator. The elevator pipe 20 is vertically fixed to the lower center of the elevator platform 4 through openings 1' and 8' formed in the first moving truck 1 and the second moving truck 8. 2
Reference numeral 1 denotes a pivot shaft concentrically attached inside the elevator pipe 20, and the pivot shaft 21 is freely pivoted about the axis by a fourth drive means 22. The fourth drive means 22 includes a fourth motor 23 attached to the lifting platform 14- and a gear mechanism (not shown). 24 is the rotation axis 2
1 via a horizontal shaft 25. At the front end of the distance detector 24, a rod 6-; 24a to which a protruding force is constantly applied by a spring or the like is freely replaced; iu 1FIIIlfl can be output continuously as an electric signal.The distance detector 24 is moved up and down about the horizontal axis 25 by a fifth drive means 26.
The fifth motor 27 is connected to the lifting table 14, and a wire 28 is pulled and pushed from the fifth motor 27.

The tip of the wire 2B is fixed to the rear end of the Il' detector 24. Therefore, when the fifth motor 27 is driven, the rotation speed l' 24. a iiioll [Move up and down within a fixed angle range.

As shown in Figure 171'j2, the wire 2 is inserted into a flexible tube 29 made of tightly wound steel wire into a pipe shape.
ing.

Said 1st to 2J Asahi 5 driving means/1. ,10,16.2
2 and 26 (r) - It is not to be said that the structure is not limited to the structure described above.

Said motor 5. Second motor 11. 3rd motor tacho8.
The fourth motor 23 and the fifth motor 27 are.

Each is controlled by a control device (not shown).

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

First, directly above the mold 30 fixed vertically.

Install the above measuring device. At this time, the measuring device
and the second moving trolley], and 8 are located at the reference point. Next, the first and second motors 5 and 11 are driven to move the 18th and second movable carts 1 and 8 to predetermined positions, respectively. After this, the third motor 18 is driven to raise and lower the elevator platform], /l.

The distance detector 24 attached to the tip of the pivot shaft 21° is lowered until it is located at a suitable height within the mold 30. After this, as shown in FIG.

The rod 2 of the distance detector 24 is driven by the fifth motor 27.
4a in the vertical direction about the horizontal axis 25 at a predetermined angle (θ
) to move. Rod 24. During the movement, the tip of a
Because it is always in contact with the inner surface of the mold.

The distance detector 24 is located at the appropriate height position.

The axis of the pivot shaft 2] and the rod 24. The talus with the tip of a [E
An electrical signal corresponding to the current is continuously output to the controller.

The controller calculates the minimum distance (4 nin) between the axis of the rotation tlqb 2 ] at the appropriate height position and the tip of the rod 24a based on the smallest electrical signal among the electrical signals that are continuously sent. Remember. Next, the fourth motor 25 is driven to rotate the rod 24a by a predetermined angle (for example, 5 degrees) from the previous position. The controller IT knee calculates and stores the minimum distance at this time based on the minimum electrical signal detected in the same way as the previous time. There are multiple controllers calculated in this way (7 if detected at 5° intervals).
Based on the distance data of the two motors, the amount of positional deviation between the axis of the rotation shaft 21 and the center of the upper end of the mold 30 is calculated, and the positions of the motor 5 and the second motor are adjusted so that the axis coincides with the center. ]] is driven.

As mentioned in -, the rod 24a is moved up and down in the next step R1! Depends on the mountain. That is, since the mold 30 is curved in an arc shape by 11ηH,%l, 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 locus drawn by one end of the tip 9 becomes an ellipse. Therefore, the controller needs to calculate the amount of positional deviation of the axis of the rotation axis 2, for example, 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 other hand, as described above, if the rod 24a is moved up and down and distance calculation is performed based on the detected minimum electric signal, this distance becomes the inner diameter of the circle, so the data processing by the controller is performed on the ellipse. It is much simpler than the case.

As a result, the controller only needs to have a relatively small computing power.

As mentioned above, once the position correction of the rotation axis 2 is completed,
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 descends vertically iM by 10°, the center of the vertical movement of the rod 24a remains at the mold 3
It does not coincide with the 0 axis. Therefore, the distance detector 24 detects the position offset from the axis of the mold 30 and the rod 24 . a
A plurality of minimum electrical signals corresponding to the distance from the tip of the controller are output to the controller. The controller adjusts the mold 3 at the preset height position based on these minimum electrical signals.
The inner diameter dimension of 0 is calculated, and the controller uses the calculation result of this inner diameter dimension.

"This is the calculation result of the mold inner diameter dimension when the center of vertical movement of the rod 24a coincides with the axis of the mold 30."

Also, if the pivot axis 21 is not exactly perpendicular to the mold 30 and is tilted, accurate measurement of the mold inner diameter cannot be performed. Therefore.

In this case as well, the controller converts the calculation results into the rotation axis 2],
Further correction is made so that the calculation results are obtained when the angle is exactly perpendicular to the mold 30.

Thereby, even in the case described above, the mold inner diameter dimension can be accurately measured.

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 round billet mold extremely accurately and in a short time, and even when measuring the degree of Celsius 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 the measurement can be performed, various useful effects can be brought about, such as being able to accurately control changes in the shape of the inner surface 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 perspective view of an embodiment of the present invention. It is a figure which shows the distance detection state by a rod. In the drawing. l...First moving trolley]'...Opening 2...Base
3...Rail 4...First drive means 5...First motor 6...Horizontal feed screw 7...Female screw plate 8...Second moving trolley
8'...Opening 9...Rail lO...Second drive means]]...Second motor 12...Horizontal feed screw 13
...Female screw π/14...Elevating platform 15...Guide column 16...Third drive means]-7...Fixing plate]8.
...Third motor 19...Vertical feed screw 20...Elevator pipe 21...Swivel shaft 22...Fourth drive means 23...
...Fourth motor 24...Distance detector 24'...Rod 25...Horizontal shaft 26...Fifth drive means 27
...Fifth motor 2B...Wire 29...Flexible tube 30...Mold applicant Mishima Kosan Co., Ltd. Applicant Nippon Kokan Co., Ltd. agent Natsuo Shioya (and 2 others) 13-

Claims (1)

[Scope of Claims] A first movable trolley that freely moves on rails fixed to the left and right directions on the base. and a first driving means for moving the first movable cart. a second movable trolley that freely moves on a rail fixed on the first movable trolley in a front-rear direction perpendicular to the rail; a second driving means for moving the second movable cart; an elevating platform that freely moves up and down along a guide column fixed vertically on the second movable cart; and third driving means for raising and lowering the lifting platform. 1- A pivot shaft extending vertically to the lower part of the lifting platform. a fourth driving means for rotating the pivot shaft about its axis; and a rond that freely advances and retreats so that its tip is always in contact with the inner surface of the mold, and is attached to the lower end of the pivot shaft via a horizontal shaft. with distance detector. and fifth driving means for moving the distance detector in the earthwork direction about the horizontal axis. Said 1st. Second. Third. The present invention is characterized by comprising a computing unit that issues control commands to the fourth and fifth drive means and computes the inner diameter dimension of the mold based on the electrical signal from the distance detector. Mold inner diameter measurement device for round billet continuous casting machines.