JPH11342420A - Furnace coiler mandrel and rolling facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality of a rolled material by restraining deformation of a mandrel due to fastening force at the time of winding, while securing a long time usage of the mandrel. SOLUTION: This furnace coiler mandrel 6 is installed in a furnace coiler and has a nearly cylindrical shape shell 61, an opening part 66 arranged in a shaft direction as a circumferential direction discontinuous portion of the shell 61, and rolled material introduction long/short guides 64, 65 positioned at both circumferential end parts of the opening part 66 respectively. The long guide 64 is arranged at the rolled material introduction direction rear side and the short guide 65 is arranged at the rolled material introduction direction front side. Thickness T1 at a portion 61a, which is adjacent to the opposite opening port 66 side of the long guide 64, is made to be thicker than a thickness T2 at a portion 61b adjacent to the opposite opening port 66 side of the short guide 65.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel for a furnace coiler used for, for example, a steckel mill or the like, and a rolling facility equipped with the furnace coiler.

[0002]

2. Description of the Related Art A Steckel mill is provided with a furnace coiler on each of an inlet side and an outlet side of a hot rolling mill, and performs several passes of reversible rolling with a hot rolling mill while alternately winding a rolled material on the furnace coiler. is there.

Conventionally, as a furnace coiler, as described in, for example, US Pat. No. 5,009,092, a housing, a mandrel for winding and unwinding a rolled material, and a mandrel provided in the housing are provided. A device having a heating means (for example, a burner) for preventing the temperature of the rolled material coil from decreasing during winding and unwinding has been proposed.

At this time, the mandrel has a hollow substantially cylindrical shape, and has an axial opening at one location in the circumferential direction. Guide portions are provided on both sides in the circumferential direction of the opening to guide the rolled material introduced into the furnace coiler smoothly into the substantially cylindrical shape. The portion having an equal thickness cylindrical shape other than the opening and the guide portion is a shell portion for winding and winding the rolled material. When the rolled material is introduced into the furnace coiler and its tip penetrates into the substantially cylindrical shape by the guide portion, the mandrel starts rotating in a direction to apply a bending force to the tip. As a result, the rolled material is sequentially wound around the shell while the tip is hooked in the mandrel.

[0005]

The above-mentioned prior art has the following problems.

(A) Hourglass Deformation When a rolled material is wound up with a mandrel, the rolled material is usually wound up with an arbitrary tension, so that a tightening force is applied to the mandrel. Since this tightening force is generated only within the width range of the rolled material, a large tightening force is applied within the width range of the substantially cylindrical mandrel, and both ends in the axial direction become out of the width range. There is not much clamping force applied to the vicinity. In the prior art mandrel, the shell portion has the same thickness in the circumferential direction and also in the axial direction. For this reason, the central portion in the axial direction is particularly easily deformed, and the amount of deformation is large, whereas the deformation is hardly generated near both ends in the axial direction. Due to the difference in the amount of deformation depending on the position of the mandrel in the axial direction, the mandrel is deformed into a substantially hourglass shape.

(B) Unusual deformation such that the opening is reduced Also, the substantially cylindrical shape of the mandrel is not continuous in the circumferential direction, and the position of the opening is a discontinuous portion. Acts, a distorted deformation (different deformation) is likely to be generated in such a way that it bends inward from a position farthest from the opening in the circumferential direction (= a position opposite to the opening with respect to the mandrel axis). . In the mandrel according to the prior art, no special consideration is given to the suppression of this abnormal deformation, and the deformation reduces the circumferential width of the opening. In particular, it becomes remarkable in the central portion of the mandrel in the axial direction where the deformation amount is originally large.

(C) Asymmetrical Deformation Further, the guide portions located on both sides in the circumferential direction of the opening have a higher rigidity than the shell portion having a simple cylindrical shape because of the function of guiding the leading end of the rolled material. Therefore, when the above-described tightening force is applied, the shell portion adjacent to the guide portion on the side opposite to the opening portion is relatively weak in rigidity, and is likely to be deformed so as to be recessed inward. At this time,
When introducing the leading end portion of the rolled material into the mandrel, the guide portion is not introduced toward the axial center position but is introduced at a position shifted forward in the introduction direction from the axial center position. Among the two guide portions, the one located on the rear side is more rigid than the one located on the front side in the introduction direction. Therefore, the difference in rigidity between the guide portion and the adjacent shell portion on the rear side in the introduction direction is larger than the difference in rigidity between the guide portion and the adjacent shell portion on the front side of the pass line.

In the mandrel according to the prior art described above, no special consideration is given to such a deviation in rigidity between the front side and the rear side of the pass line, so that the difference in deformation between the guide portion and the adjacent shell portion is large at the front side of the pass line. In spite of this, the guide portion does not deform much on the rear side of the pass line, and only the adjacent shell portion is largely recessed.

When the rolled material is wound up in the state where the various deformations (a) to (c) have occurred in the mandrel, there is a possibility that vibration or the like may be induced due to meandering of the rolled material or fluctuation in tension. This hinders the quality improvement of the rolled material. In particular, when the deformation of the above (b) occurs, the circumferential width of the opening becomes narrow, so that it becomes difficult to insert the rolled material into the mandrel, and it cannot be said that there is no possibility that the rolling will be hindered.

Heretofore, in order to suppress the above-mentioned adverse effects as much as possible, the deformed mandrel has been also subjected to circular grinding to a state close to a perfect circle and reused. However, in this case, there is a new problem that the replacement time of the mandrel is hastened and it is difficult to use the mandrel continuously for a long time. Also,
In view of the structural strength, there is also a problem that it is difficult to perform the grinding in a perfect circular shape in consideration of the thickness of the shell.

An object of the present invention is to provide a mandrel for a furnace coiler and a furnace coiler that can suppress deformation of the mandrel due to a tightening force at the time of winding while improving the quality of a rolled material while securing long-term use of the mandrel. Rolling equipment.

[0013]

(1) To achieve the above object, the present invention is provided in a furnace coiler,
A substantially cylindrical shell portion, an opening portion disposed in the axial direction as a circumferential discontinuous portion of the shell portion, and first and second rolling material introduction first and second positions located on both circumferential sides of the opening portion. In the furnace mandrel having a guide portion of the above, the first guide portion is disposed on the rear side in the rolled material introduction direction, and the second guide portion is disposed on the front side in the rolled material introduction direction. The thickness T1 of a portion of the shell portion adjacent to the opening side of the first guide portion is equal to the thickness T2 of a portion adjacent to the opening side of the second guide portion. It is thicker than.
The guide portions located on both sides in the circumferential direction of the opening have a higher rigidity than the shell portion having a simple cylindrical shape because of the function of guiding the leading end of the rolled material. Therefore, when a tightening force is applied, a portion of the shell portion adjacent to the opening opposite to the guide portion is relatively weak in rigidity, and is likely to be deformed inward so as to be recessed inward. Further, at this time, when the guide portion introduces the leading end of the rolled material into the mandrel, the guide portion is not introduced toward the axial center position but toward a position shifted forward from the axial center position in the rolled material introduction direction. Due to the structure, the first guide portion located on the rear side is more rigid than the second guide portion located on the front side in the introduction direction. Therefore, the difference in rigidity between the first guide portion and the adjacent shell portion on the rear side in the introduction direction is larger than the difference in rigidity between the second guide portion and the adjacent shell portion on the front side in the introduction direction. That is, asymmetrical deformation occurs in the front side and the rear side in the introduction direction.

In the present invention, accordingly, the thickness T1 of the portion adjacent to the first guide portion on the side opposite to the opening is changed to the thickness of the portion adjacent to the second guide portion on the side opposite to the opening. Thicker than T2. Thereby, the rigidity of the portion of the shell portion adjacent to the first guide portion can be relatively improved, and the difference in rigidity with the first guide portion can be reduced. Therefore, the difference in rigidity between the first guide portion and the adjacent shell portion on the rear side in the introduction direction can be made closer to the difference in rigidity between the second guide portion and the adjacent shell portion on the front side in the introduction direction. Deformation behaviors on the rear side and the front side in the rolled material introduction direction are substantially equalized to be symmetrical, and it is possible to suppress occurrence of asymmetrical deformation.

(2) In the above (1), preferably,
When the length of the first guide portion in the rolling material introduction direction is L2 and the thickness in a direction perpendicular to the introduction direction is T4, T1 ≦ L2 ≦ 6 × T4.
The rigidity increases as the length L2 of the first guide portion in the rolled material introduction direction increases, but by setting this L2 to be equal to or less than six times the thickness T4 in the direction perpendicular to the introduction direction, the first guide portion is formed. The rigidity of the portion can be relatively reduced. Thereby, the difference in rigidity between the first guide portion and the adjacent shell portion on the rear side in the rolled material introduction direction can be reduced, so that the difference in rigidity between the second guide portion and the adjacent shell portion on the front side in the introduction direction is further increased. You can get closer.
At this time, by satisfying T1 ≦ L2, the original function of the first guide portion of smoothly introducing the rolled material can be ensured.

(3) In the above (1), preferably, the angle formed by the side wall surface of the opening of the first guide portion with respect to the radial direction is 40 ° or less. The greater the angle of the first guide portion with respect to the radial direction of the side wall surface of the opening, the more the inclination of the first guide portion approaches the circumferential direction and the lower the rigidity. It can be more suppressed. However, at this time, if the angle is too large, the opening becomes narrow and the original function of smoothly introducing the rolled material is hindered. Therefore, the angle formed by the first guide portion with respect to the radial direction of the side wall surface of the opening is set to 40 degrees.
° or less, the asymmetric deformation can be further suppressed while ensuring smooth introduction of the rolled material.

(4) In order to achieve the above object, the present invention is also provided in a furnace coiler, wherein a substantially cylindrical shell portion and an axially discontinuous portion of the shell portion are provided in the axial direction. And a furnace coiler mandrel having a rolled material introduction first and second guide portion respectively positioned on both sides in the circumferential direction of the opening, in the shell portion, from the opening in the circumferential direction. The thickness T3 of the farthest part is calculated as the average thickness Tm of the entire shell in the circumferential direction.
larger than ean. The substantially cylindrical shell portion of the mandrel is not continuous in the circumferential direction, and the position of the opening becomes a discontinuous portion. When a tightening force is applied, the portion farthest from the opening in the circumferential direction (= mandrel shaft center) (A position substantially opposite to the opening with respect to the opening). In the present invention, accordingly, the thickness T3 of the portion farthest from the opening in the circumferential direction is made larger than the average thickness Tmean of the shell portion in the entire circumferential direction. That is, in the entire shell portion, at least the portion farthest from the opening in the circumferential direction is relatively rigid. Thereby, the above-mentioned abnormal deformation can be suppressed.

(5) In the above (4), preferably,
A first rib extending in the circumferential direction at at least one location in the axial direction of the inner periphery of the shell portion, and a radial height of a portion of the first rib that is farthest from the opening in the circumferential direction; The height H1 is made larger than the radial height H2 of the portion located near the opening. This makes it possible to further increase the rigidity of the shell portion at the portion farthest from the opening in the circumferential direction, so that the deformation can be further suppressed.

(6) In order to achieve the above object, the present invention is also provided in a furnace coiler, wherein a substantially cylindrical shell portion and a circumferentially discontinuous portion of the shell portion are disposed in the axial direction. In the furnace mandrel for a furnace coiler having an opening portion and first and second guide portions for introducing a rolled material respectively positioned on both sides in the circumferential direction of the opening portion, at a plurality of axial positions on the inner periphery of the shell portion, Further comprising a plurality of first ribs each extending to
In addition, of the plurality of first ribs, the axial thickness Tb1 of the one located at a position corresponding to the inside of the plate width of the rolled material is set to the axial thickness of the one located at the position corresponding to the outside of the plate width of the rolled material. The thickness is set to be larger than Tb2. Since the tightening force on the mandrel is generated only within the range of the width of the rolled material, a large tightening force is applied within the range of the width of the substantially cylindrical shell portion, and the axial direction becomes out of the range of the width of the plate. There is not much tightening force applied near both ends. In the present invention, in response to this, the first rib is extended in the circumferential direction at a plurality of locations in the axial direction of the inner periphery of the shell portion, and among the plurality of first ribs, the first rib extends within the plate width of the rolled material. The axial thickness Tb1 of the material at the corresponding position is made larger than the axial thickness Tb2 of the material at the position corresponding to the outside of the sheet width of the rolled material.
This makes it possible to relatively increase the rigidity of the portion of the shell portion within the plate width range compared to the portion outside the plate width range, thereby reducing the difference in the amount of deformation due to the axial position and reducing the mandrel. Can be suppressed from deforming into a substantially drum shape.

(7) In order to achieve the above object, the present invention also includes a rolling mill, and furnace coilers provided on an entrance side and an exit side of the rolling mill, respectively. In a rolling facility provided with a mandrel for winding and unwinding a material, any one of the above (1), (4) and (6) is provided as the mandrel.

[0021]

An embodiment of the present invention will be described below with reference to the drawings. This embodiment is an embodiment in which the present invention is applied to a Steckel mill rolling facility.

FIG. 2 is a side sectional view showing a structure of a Steckel mill rolling facility having a furnace coiler provided with a mandrel and a rolling mill according to the present embodiment, and FIG. 3 is a cross sectional view taken along line III-III in FIG. It is.

In FIG. 3 and FIG. 2, the Steckel mill uses a hot rolled material (strip) 1 with upper and lower working ports 2.
Reversible finishing mill 2 capable of reversibly rolling between U and 2L
And an adjacent table roller 3 to assist it
And a pinch roller 4 as a conveying means capable of biting the rolled material 1, and both on the entrance side and the exit side of the reversible finishing mill 2 in order to heat or heat the rolled material 1 during rolling. Furnace coilers 5, 5 provided (only one is shown in FIG. 2), a lower guide 7 for introducing the rolled material 1 into the furnace coiler 5, and a rolled material 1
And an upper guide 8 for introducing the fluid into a mandrel 6 (described later).

The pinch roller 4 rolls the rolled material 1 to the rolling mill 2 (left side in FIG. 2) and the non-rolling mill 2 side (right side in FIG. 2).
Are alternately repeated. For details,
For example, the roller is pressed when the rolled material 1 is passed through the rolling mill 2, and the upper roller is released during winding and unwinding of the rolled material 1 (described later).

The furnace coiler 5 includes a mandrel 6 for introducing the rolled material 1 through an opening 66 (described later) and winding the rolled material 1 and a heating device for heating or keeping the temperature of the rolled material 1 during winding by the mandrel 6. Means (for example, a burner) 9, an upper furnace body 13 and a lower furnace body 14, and these furnace bodies 13, 14
And a gantry 15 for supporting. At this time, the lower furnace body 14 is provided with a rolled material opening 16 for taking the rolled material 1 in and out, and the upper furnace body 13 is provided with a chimney 17 for exhausting exhaust gas in the furnace. Have been.

It goes without saying that the structure of the other furnace coiler 5, not shown, and the structure between the furnace coiler 5 and the reversible finishing mill 2 are the same.

[0027] In the Steckel rolling plant having the above configuration,
When the reversible rolling of the rolled material 1 is performed, a bar material rolled by a rough rolling mill (not shown) located on the upstream side of the pass line is transferred to a table roller (not shown, but the table roller 3 in FIG. 2).
(Substantially the same as described above). The leading portion of the rolled material 1 that has been passed through the rolling mill 2 to the right in FIG. 2 and has been subjected to the first pass rolling is conveyed by a table roller 3. At this time,
The lower guide 7 which has been lowered on the same surface as the table roller 3 rises, and the upper guide 8 located at the tip of the lower guide 7 also rises, and is sent by the pinch roller 4 from the reversible finishing mill 2. The rolled material 1 is guided to the inside of the furnace coiler 5 above the pass line of the table roller 3, and further guided to an opening 66 as an engagement portion of the mandrel 6 in the furnace coiler 5.

When the leading end of the rolled material 1 that has been guided is inserted into the opening 66 of the mandrel 6, the mandrel 6 rotates clockwise in FIG. Material 1 is wound. In this way, while the rolled material 1 is wound around the mandrel 6, the rolled material 1 is wound into a coil in the furnace coiler 5 while applying tension to the rolled material 1. When winding is started, the upper guide 8 is lowered so as not to interfere with the rolled material 1 that has been wound.

Thereafter, when the trailing end of the rolled material 1 falls out of the rolling mill 2, the rolling mill 2 and the furnace coiler 5 are reversed to perform the second pass rolling. That is, the rolled material 1 wound up by the furnace coiler 5 is unwound, and the rolling mill 2 passes the rolled material 1 to the left in FIG.
The rolled material 1 is rolled up by a furnace coiler 5 on the opposite side (not shown) in the same manner as described above.

After the above-described forward / reverse rolling is repeated several times by the rolling mill 2 to obtain a predetermined product thickness, the rolled material 1 is formed into a coil shape by a finishing winder (not shown) provided downstream of the pass line. Take up.

FIG. 1 is a cross-sectional view showing a detailed structure of the mandrel 6 which is a main part of the present embodiment, and FIG. 4 is a partially enlarged vertical cross-sectional view of a portion A in FIG. In FIGS. 1, 3 and 4, a shaft 10 is disposed at the center of the mandrel 6, and both ends of the shaft 10 are rotatably supported by bearings 11. A gear coupling 12 is attached to one end (right side in FIG. 3) of the shaft 10, and a rotational driving force from a rotational driving means (motor) (not shown) is transmitted to the gear coupling 12. , The mandrel 6 rotates. In addition, Ba in FIG. 3 indicates the inside of the rolled sheet width, and Bb indicates the outside of the rolled sheet width. The mandrel 6 winds the rolled material 1 in a region of Ba within the rolled material plate width in the axial direction. The rolled material 1 is not directly in contact with the rolled material 1 outside the rolled material plate width Bb outside the rolled material plate width Ba.

The mandrel 6 is, as shown in FIG.
A shell 61 having a substantially cylindrical shape is provided. The shell 61 is further provided with a vertical rib 62 and a horizontal rib 63 for reinforcing the strength. The vertical rib 62 has a substantially ring shape,
Along the inner circumferential surface of the mandrel 6, the inner circumferential surface of the mandrel 6 extends circumferentially at a plurality of axially spaced locations at arbitrary intervals. The horizontal ribs 63 extend axially at a plurality of positions in the circumferential direction at arbitrary intervals on the inner circumferential surface of the mandrel 6 at intervals between the plurality of vertical ribs 62. That is, as shown in FIG. 4, the rib 61 has a rib thickness Tb with respect to the shell 61 having the shell thickness Ta.
The vertical ribs 62 are provided so that the rib heights Ha (Ha> Ta). The horizontal rib 63 has a rib height Hb (Ha> H).
b> Ta).

Further, the mandrel 6 has a substantially rectangular opening 66 disposed in the axial direction as a circumferential discontinuous portion of the shell portion 61, and rolled material introduction holes positioned on both circumferential sides of the opening 66. A long guide 64 and a short guide 65 are provided. At this time, the long guide 64 on the rolling mill 2 side (= rearward side in the rolling material 1 introduction direction) and the short guide 65 on the non-rolling mill 2 side (= forward side in the rolling material 1 introduction direction) are not the same shape, As shown in FIG. Then, after the rolled material 1 is inserted into the opening 66, the whole mandrel 6 rotates clockwise to give a reverse bend to the rolled material 1 and hook the rolled material 1 on the short guide 65. Rolled material 1 on the outer peripheral surface of
Is to be wound up.

The most significant features of the mandrel 6 according to the present embodiment are a drum-shaped deformation, an abnormal deformation such that an opening is reduced,
In order to suppress the occurrence of various deformations such as asymmetric deformation, various considerations are given to the dimensions of the shell 61, the long guide 64, the short guide 65, the vertical ribs 62, and the horizontal ribs 63. Hereinafter, for the dimensions of each part,
The operation will be described in detail.

(1) Configuration for Suppressing Asymmetric Different Deformation (1-A) Shell Thickness In the mandrel 6 of the present embodiment, first, the thickness Ta of the shell 61 is made uneven in the circumferential direction, and Of the 61, the thickness Ta = T1 of a portion 61a of the long guide 64 adjacent to the opening 66 side is larger than the thickness Ta = T2 of the portion 61b of the short guide 65 adjacent to the opening 66 side. (For example, T1 ≒ 85 mm, T2 ≒ 60 mm). This has the following significance.

The long and short guides 64 and 65 located on both sides in the circumferential direction of the opening 66 have the function of guiding the leading end of the rolled material 1.
The rigidity is higher than that of the shell 61 having a simple cylindrical shape. Therefore, when a tightening force is applied from the rolled material 1 at the time of rolling the rolled material, the guide 6
4, 61, 61a, 61 adjacent to the opening 66 side
b is a portion having relatively low rigidity, and is likely to be deformed inwardly, such as being depressed inward. At this time, the guides 64, 65
When the tip of the rolled material 1 is introduced into the mandrel 6,
The leading end is not introduced toward the axial position (that is, the center of the shaft 10) P, but is introduced toward a position shifted forward (to the right in FIG. 1) from the axial position P in the rolling material introduction direction. The short guide 6 is located on the front side in the introduction direction due to its structure.
The rigidity of the long guide 64 located on the rear side (left side in FIG. 1) is higher than that of the long guide 64. Therefore, the long guide 64 and the shell adjacent portion 61a on the rear side in the introduction direction
Is different from the short guide 65 on the front side in the introduction direction.
Is larger than the difference in rigidity between the shell and the adjacent portion 61b, and the amount of deformation also depends on such rigidity behavior. FIG. 5 shows the behavior of the different deformation as described above. FIG. 5 is an analysis of how the outer shape of the shell 61 of the mandrel 6 changes due to the above-mentioned abnormal deformation. A thin, substantially circular line represents the outer shape of the shell 61 before the abnormal deformation. The solid line represents the outer shape of the shell 61 after the different deformation. For reference, the positions of the long and short guides 64.65 are also indicated by broken lines. In FIG. 5, as described above, it can be seen that the portions 61 a and 61 b adjacent to the guides 64 and 65 on the side opposite to the opening 66 are recessed inward. In particular, the difference in the amount of deformation between the short guide 65 and the shell adjacent portion 61b is not so large on the front side in the rolled material introduction direction, whereas the long guide 64 is not significantly deformed on the rear side in the rolled material introduction direction. It can be seen that the portion 61a is significantly deformed, and there is a large difference in the amount of deformation. That is, as shown in FIG. 5, asymmetrical deformation occurs in the front side and the rear side in the rolled material introduction direction.

In the mandrel 6 of the present embodiment, the thickness T 1 of the portion 61 a of the shell 61 adjacent to the long opening 64 on the side opposite to the opening 66 of the short guide 65 is accordingly adjusted. Thickness T2 of the portion 61b adjacent to the side
Thicker than Thereby, the rigidity of the portion 61 a of the shell portion 61 adjacent to the long guide 64 is relatively improved, and the difference in rigidity with the long guide 64 can be reduced. Therefore, the long guide 64 on the rear side in the introduction direction
The difference in rigidity between the short guide 65 and the shell adjacent portion 61b on the front side in the introduction direction can be made closer to the difference in rigidity between the short guide 65 and the shell adjacent portion 61b. Are made substantially equal to each other to make them symmetrical, thereby suppressing the occurrence of asymmetrical deformation.

(1-B) Length and Thickness of Long Guide Portion In the mandrel 6 of the present embodiment, the length L2 of the long guide 64 in the rolled material introduction direction is defined as a direction perpendicular to the rolled material introduction direction. And the thickness T1 of the shell adjacent portion 61a is set to be 6 times or less the thickness T4 of
That is all. That is, T1 ≦ L2 ≦ 6 ×
It is configured to be T4. This has the following significance.

The rigidity of the long guide 64 increases as the length L2 in the rolled material introduction direction increases. As described above, if the rigidity difference between the long guide 64 and the shell adjacent portion 61a is large, asymmetric deformation occurs, and therefore it is preferable to reduce the rigidity of the long guide 64 as much as possible. The inventors of the present application varied the length L2 in the rolled material introduction direction, analyzed the deformation behavior of the entire shell 61 at that time, and obtained the deformation behavior as shown in FIG. Although not shown, it has been found that the rigidity of the long guide 64 can be relatively sufficiently reduced by setting L2 to 6 times or less the thickness T4 of the long guide 64 in a direction perpendicular to the rolling material introduction direction. That is, by setting L2 ≦ 6 × T4, the difference in rigidity between the long guide 64 and the shell adjacent portion 61a on the rear side in the rolled material introduction direction can be sufficiently reduced, and the short guide 65 and the shell adjacent portion on the front side in the introduction direction can be reduced. The difference in rigidity with respect to 61b can be more reliably approached.

At this time, on the other hand, as the length L2 of the long guide 64 in the rolled material introduction direction is longer, the original function of smoothly introducing the rolled material 1 can be improved. Therefore, if the length L2 of the long guide 64 is made too small for the purpose of suppressing the asymmetric deformation as described above, the rolled material introduction function is reduced, so that the length L2 of the long guide 64 is made too small. Preferably not too much. The inventors of the present application examined the introduction guide function of the rolled material 1 by changing L2 variously. As a result, although not particularly shown, if this L2 is set to be equal to or more than the shell adjacent portion 61a, the introduction of the rolled material of the long guide 64 can be performed. It turned out that the function could be secured enough. That is, by setting T1 ≦ L2, the original function of the guide 64, that is, the smooth introduction of the rolled material 1 can be ensured.

As described above, by setting T1 ≦ L2 ≦ 6 × T4, the rigidity between the long guide 64 and the shell adjacent portion 61a on the rear side in the rolled material introduction direction is ensured while ensuring the function of introducing the rolled material 1 of the long guide 64. Between the short guide 65 and the shell adjacent portion 6 on the front side in the introduction direction.
1b, the difference between the rigidity of the rolled material and the rigidity of the rolled material introduction direction is improved.
The generation of asymmetric deformation can be more reliably suppressed.

(1-C) Angle of Long Guide Portion Further, in the mandrel 6 of this embodiment, the long guide 64
(See FIG. 1) with respect to the radial direction of the side wall surface 64a of the opening (see line segment PQ in FIG. 1) is 40 ° or less.
This has the following significance.

The long guide 64 has an opening side wall surface 64a.
The larger the angle θ with respect to the radial direction of the
Since the inclination of 4 approaches the circumferential direction and the rigidity is weakened, the asymmetrical deformation described above can be more reliably suppressed. However, at this time, if the angle θ is too large, the width L1 of the opening 66 becomes narrow, and the original function of smoothly introducing the rolled material 1 is hindered. The inventors of the present application examined the introduction guide function of the rolled material 1 by changing θ variously. As a result, although not particularly shown, if this θ2 is set to 40 ° or less, the rolled material introduction function of the long guide 64 can be sufficiently improved. It was found that it could be secured. That is, θ2 ≦ 40 °
By doing so, the difference in rigidity between the long guide 64 and the shell adjacent portion 61a on the rear side in the rolled material introduction direction can be further reduced while ensuring the smooth introduction of the rolled material 1, and the asymmetrical deformation described above occurs. Can be more reliably suppressed.

(1-D) Length of Short Guide Portion Further, in the mandrel 6 of this embodiment, the short guide 65
The length L3 in the rolled material introduction direction is longer than that of a normal mandrel of this type. Thus, the rigidity of the short guide 65 having relatively small rigidity can be increased, so that the rigidity of the guides 64 and 65 on both sides can be made more nearly uniform, and the asymmetric deformation can be more reliably generated. Can be suppressed.

(2) Configuration for Suppressing Unusual Deformation such as Reduction of Opening (2-A) Thickness of Shell In the mandrel 6 of the present embodiment, the shell 61 extends from the opening 66 in the circumferential direction. The thickness of the farthest part 61c Ta =
T3 is larger than the average thickness Tmean of the entire shell 61 in the circumferential direction (for example, T3 ≒ 70 mm). This has the following significance.

The substantially cylindrical shell 61 of the mandrel 6 is not continuous in the circumferential direction, and the position of the opening 66 is a discontinuous portion. Part farthest from the part 66 (= axis 10
At a position substantially opposite to the opening 66 with respect to the center of the
Different deformation such as bending inward from 1c is likely to occur (see also FIG. 5 described above). In the mandrel 6 of the present embodiment, the opening 6
6, the thickness T3 of the portion furthest in the circumferential direction 61c is calculated as the average thickness Tmean of the shell portion in the entire circumferential direction (the thickness Ta of the portion is equal to T = T
3. The average value of the entire circumference area including Ta = T1 of the long guide adjacent portion 61a and Tb = T2 of the short guide adjacent portion 61b, in this case, for example, Tmean = 68 mm. Thereby, the rigidity of at least the circumferentially farthest portion 61c in the entire shell 61 can be relatively increased. It is possible to suppress the abnormal deformation such that the opening 66 is reduced.

(2-B) Height of Vertical Rib Also, in the mandrel 6 of the present embodiment, the height Ha of the vertical rib 62 is made uneven in the circumferential direction, and the vertical rib 62 has the highest height in the circumferential direction from the opening 66. Radial height Ha of remote portion 62a = H1
Is larger than the radial height Ha = H2 of the portion 62b located near the opening 66. Thereby, the shell 6
1 can further increase the rigidity in the portion 61c in the circumferential direction farthest from the opening 66, so that the opening 6
6 can be further suppressed from being reduced.

In place of the above, the thickness T of the vertical rib 62
b may not be uniform in the circumferential direction, but may be thicker in the vicinity of the farthest circumferential portion 61c than in other portions. Furthermore, of the lateral ribs 63 provided at a plurality of positions in the circumferential direction, the circumferentially furthest portion 61c
The height Hb and the thickness of the components provided in the vicinity may be larger than those provided at other positions.

(3) Configuration for Suppressing Hourglass Deformation (3-A) Thickness of Vertical Rib In the mandrel 6 of the present embodiment, among the vertical ribs 62 provided at a plurality of positions in the axial direction, the rolled material 1 The axial thickness Tb = Tb1 of the rolled material 1 outside the width range Bb of the rolled material 1 is larger than the axial thickness Tb = Tb2. This has the following significance.

Since the tightening force acting on the mandrel 6 is generated only in the range Ba of the rolled material 1 within the range of the width of the plate, a large tightening force is applied in the range Ba of the shell 61 within the range of the width of the plate. The tightening force is not much applied to Bb outside the range of the plate width. Accordingly, in the mandrel of the present embodiment, the axial thickness Tb1 of the plurality of longitudinal ribs 62 located inside the rolled material plate width Ba is larger than the axial thickness Tb2 of the plurality of longitudinal ribs 62 located outside the plate width Bb. Enlarge. This makes it possible to make the rigidity of the portion of the shell 61 within the plate width range Ba relatively higher than the rigidity of the portion outside the plate width range Bb. Therefore, the difference in the deformation amount of the shell 61 depending on the axial position can be reduced, and the deformation of the mandrel 6 into a substantially drum-shaped shape can be suppressed.

As described in (1) to (3) above, according to the present embodiment, the thickness Ta of the shell 61 is changed, the guides 64 and 65 on both sides of the opening are changed, the vertical rib 62 is changed, and the like. By performing the above, it is possible to reduce the deformation of the mandrel 6 by eliminating unevenness in the rigidity of the entire mandrel 6 to make the mandrel 6 more nearly uniform. Also, when deformed, it is deformed into a circular shape, which makes it possible to improve irregular deformation. Therefore, in the Steckel mill rolling equipment, it is possible to reduce the possibility of inducing vibration or the like due to the meandering of the rolled material 1 or fluctuation in tension, so that a high-quality product can be manufactured. In addition, since it is not necessary to perform the conventional circular grinding, the life of the mandrel 6 can be extended, and a good economic effect can be obtained.

Of the above effects, the effect of suppressing the deformation will be described more specifically with reference to FIG. FIG.
FIG. 8 shows the results of analysis performed by FEM on stress analysis at the outer peripheral portion on the axially central section of the mandrel 6. Taking the tensile stress on the + side and the compressive stress on the-side of the vertical axis,
The horizontal axis indicates circumferential positions (symbols A to G) on the outer periphery of the mandrel. For comparison, the thickness of the shell 61 is uniform over the entire circumference, and the length L2 of the long guide 64 in the rolled material introduction direction is greater than six times the thickness T4 in the direction perpendicular to the rolled material introduction direction ( That is, L2> 6 × T
4), the angle θ> 4 of the opening side wall surface 64a of the long guide 64
As a comparative example, the case where the length of the short guide 65 is 0 °, the length of the short guide 65 is normal (without consideration of improvement in rigidity), and the height and the thickness of the vertical rib are uniform is also shown by a two-dot chain line in the figure.

(I) Stress Distribution in Comparative Example In FIG. 6, in the stress distribution of the comparative example represented by the two-dot chain line, first, the opening 6
A strong compressive stress is generated in the portion 61a (near F) adjacent to the sixth side. This compressive stress is because the rigidity of the farthest portion 61c from the opening 66 of the shell 61 and the rigidity of the long guide 64 are stronger than the rigidity of the shell adjacent portion 61a with respect to the tightening force applied in the radial direction of the mandrel. , Due to the difference in rigidity, the shell adjacent portion 61a
Are subjected to compressive stress. In addition, short guide 6
A strong compressive stress is also generated in the portion 61b (near B) adjacent to the side opposite to the opening 66 of No. 5. From these,
As described in the above (1), the portions 61a and 61b adjacent to the guides 64 and 65 on the side opposite to the opening 66 are the guides 6.
It can be seen that the behavior of denting inward than 4,65 is supported. At this time, since the compressive stress in the vicinity of F is significantly larger than that in the vicinity of B, the difference in the amount of deformation between the short guide 65 and the shell adjacent portion 61b on the front side in the rolled material introduction direction is It can be seen that the difference in the amount of deformation between the long guide 64 and the shell adjacent portion 61a on the rear side in the introduction direction is large, which causes a different deformation.

In FIG. 6, a portion 61c of the shell 61 farthest from the opening 66 (= the opposite side of the opening 66 across the center of the shaft 10) (around D) receives a strong tensile stress. I understand. As a result, as described in the above (2), when a tightening force is applied at the time of rolling the rolled material, a different deformation is generated such that the bending is performed inward with the farthest portion 61c as a base point, thereby being pulled outward. It can be seen that a high tensile stress is acting.

(II) Stress Distribution in the Present Embodiment In contrast to the stress distribution behavior in the comparative example as described above, the stress distribution behavior in the present embodiment has substantially the same stress peak position as shown in FIG. However, the stress peak value is significantly reduced in both the compressive stress and the tensile stress.

That is, first, as described in the above (1), the thickness T1 of the portion 61a of the shell 61 adjacent to the long opening 64 on the side opposite to the opening 66 is reduced by the opposite side of the short guide 65 to the opening 66 side. And the length L2 of the long guide 64 in the rolled material introduction direction is set to be six times or less the thickness T4. Thus, the difference in rigidity between the long guide 64 (near G) and the shell adjacent portion 61a (near F) on the rear side in the rolling material introduction direction is reduced, and the compressive stress FF acting on the shell adjacent portion 61a (near F) is reduced. (For example, about 25%). As a result, the compressive stress is reduced by the short guide 65 (near A) and the shell adjacent portion 61b on the front side in the introduction direction.
(Near B) and the shell adjacent portion 61b based on the difference in rigidity.
(Near B) close to the value of the compressive stress FB acting on (near B). Therefore, it was found that the deformation behaviors on the rear side and the front side in the rolled material introduction direction were substantially equal to be symmetrical, and it was possible to suppress occurrence of asymmetrical deformation.

As described in the above (2), the portion 6 of the shell 61 that is the farthest from the opening 66 in the circumferential direction.
The thickness T3 of 1c is the average thickness Tm of the entire shell 61 in the circumferential direction.
ean, and the radial height H1 of the farthest portion 62a in the circumferential direction of the vertical rib 62 is larger than the radial height H2 of the portion 62b located near the opening 66.
Thereby, the rigidity of the part 61c (near D) in the circumferential direction farther from the opening 66 of the shell 61 is strengthened, and the tensile stress FD acting on the part 61c (near D) in the circumferential direction is reduced (for example, about 15%). You can see that it has eased. Therefore, it has been found that the deformation that causes the opening 66 to shrink can be suppressed.

In the above embodiment, the short guide 6
5 is the thickness T2 of the shell adjacent portion 61b on the side opposite to the opening 66.
Is not as thick as about 60 mm in consideration of the balance of rigidity like the long guide 64 side. That is, for example, when the thickness T2 of the shell adjacent portion 61b is increased to about 80 mm, a compressive stress acts on the contrary due to a difference in rigidity with the short guide 65. Therefore, the thickness T2 of the shell adjacent portion 61b is not increased, but the stress balance is achieved by increasing the rigidity by changing the shape of the short guide 65.

[0059]

According to the present invention, the difference in rigidity between the first guide portion and the adjacent shell portion on the rear side in the rolled material introduction direction is determined by the difference between the second guide portion and the adjacent shell portion on the front side in the introduction direction. Since the difference in stiffness can be approached, the deformation behavior on the rear side and the front side in the rolled material introduction direction can be made substantially equal to be symmetrical, and the occurrence of asymmetrical deformation can be suppressed. Also, in the entire shell portion, at least the portion farthest from the opening in the circumferential direction from the opening can be relatively strengthened, so that it is bent inward starting from the portion farthest from the opening in the circumferential direction. It is possible to suppress various deformations. In addition, since the rigidity of the portion of the shell portion within the plate width range can be made relatively larger than that of the portion outside the plate width range, the difference in the amount of deformation due to the axial position is reduced, and the mandrel is reduced. Deformation into a substantially drum shape can be suppressed. Therefore, it is possible to reduce the possibility of inducing vibration or the like due to meandering of the rolled material, fluctuation in tension, and the like, and to improve the quality of the rolled material. Also, at this time, since the need to grind the mandrel is reduced, long-term use of the mandrel can be ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a detailed structure of a mandrel according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a structure of a Steckel mill rolling facility having a furnace coiler provided with the mandrel of FIG. 1 and a rolling mill.

FIG. 3 is a transverse sectional view taken along a line III-III in FIG. 2;

4 is a partially enlarged longitudinal sectional view of a portion A in FIG.

FIG. 5 is a diagram showing a result of analyzing how the outer shape of the shell of the mandrel changes due to different deformation.

FIG. 6 is a diagram showing an analysis result obtained by performing a stress analysis on an outer peripheral portion by FEM on a cross section of a central portion of the mandrel in the axial direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rolled material 2 Reversible finishing mill 5 Furnace coiler 6 Mandrel 61 Shell (shell part) 61a Shell adjacent part (part adjacent to the non-opening side of the first guide part) 61b Shell adjacent part (second guide part) 61c The farthest part of the shell (part farthest from the opening in the circumferential direction) 62c The vertical rib (first rib) 62a The farthest part of the vertical rib (the part farthest from the opening in the circumferential direction) 62b A portion near the vertical rib opening (a portion located near the opening) 63 A horizontal rib (second rib) 64 A long guide (first guide) 64a An opening side wall surface 65 A short guide (second guide) 66 opening

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsumi Totsuka 4-2 Kojimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Japan Japan Metallurgical Industry Co., Ltd.

Claims (7)

[Claims] 1. A substantially cylindrical shell portion provided in a furnace coiler, an opening axially disposed as a discontinuous portion in the circumferential direction of the shell portion, and a circumferentially opposite side of the opening. In a mandrel for a furnace coiler having first and second guide portions for introducing a rolled material, wherein the first guide portion is disposed on the rear side in the rolled material introduction direction and the second guide is provided. The shell portion is disposed on the front side in the rolling material introduction direction, and the thickness T1 of a portion of the shell portion adjacent to the opening side of the first guide portion is equal to that of the second guide portion. A mandrel for a furnace coiler, wherein the mandrel is thicker than a thickness T2 of a portion adjacent to the opening side. 2. The furnace mandrel according to claim 1, wherein the length of the first guide portion in the rolling material introduction direction is L2 and the thickness of the first guide portion in a direction perpendicular to the introduction direction is T4. A mandrel for a furnace coiler, wherein T1 ≦ L2 ≦ 6 × T4. 3. The furnace coiler mandrel according to claim 1, wherein an angle formed by the side wall surface of the opening of the first guide portion with respect to a radial direction is 40 ° or less. Mandrel. 4. A substantially cylindrical shell portion provided in a furnace coiler, an opening axially disposed as a discontinuous portion of the shell portion in the circumferential direction, and a circumferentially opposite side of the opening. In a furnace mandrel for a furnace coiler having a first and a second guide portion for introducing a rolled material, a thickness T3 of a portion of the shell portion which is the farthest in the circumferential direction from the opening portion is defined by a peripheral portion of the shell portion. Average thickness in all directions
Mandrel for furnace coiler characterized by having a larger size. 5. The furnace coiler mandrel according to claim 4, further comprising a first rib extending in a circumferential direction at at least one position in an axial direction of an inner periphery of said shell portion, and said first rib. Wherein a radial height H1 of a portion farthest from the opening in the circumferential direction is larger than a radial height H2 of a portion located in the vicinity of the opening. 6. A substantially cylindrical shell portion provided in a furnace coiler, an opening axially disposed as a circumferentially discontinuous portion of the shell portion, and a circumferentially opposite side of the opening. In a furnace mandrel for a furnace coiler having a first and a second guide portion for introducing a rolled material, a plurality of first ribs each extending in a circumferential direction at a plurality of positions in an axial direction of an inner periphery of the shell portion are further provided. And among the plurality of first ribs, those having a thickness in the axial direction Tb1 at a position corresponding to the inside of the plate width of the rolled material, and having a position corresponding to the outside of the plate width of the rolled material. A mandrel for a furnace coiler characterized by having a thickness greater than the axial thickness Tb2. 7. A rolling mill, and a furnace coiler provided on an inlet side and an outlet side of the rolling mill, respectively, and the furnace coiler includes a mandrel for winding and unwinding a rolled material. The rolling equipment according to claim 1, wherein the mandrel is any one of claims 1, 4, and 6.
A rolling facility, comprising the mandrel described in the item.