JP5949733B2 - Work roll, rolling mill, and work roll repair method - Google Patents

Description

  The present invention relates to a work roll of a rolling mill, a rolling mill, and a work roll repair method.

  In general, a work roll of a rolling mill is formed of a steel material containing nickel, chromium, or the like, is attached to a spindle having a coupling, and is driven by a motor through the spindle. More specifically, as shown in FIG. 5, the work roll 1 of the rolling mill 10 is coupled to the spindle 2 and then coupled to the motor 6 via the pinion stand 3, the gear coupling 4, and the speed reducer 5. . The driving force of the motor 6 is transmitted to the work roll 1 by the spindle 2 having the joint 2a and the coupling 2b.

  The work roll 1 and the spindle 2 are coupled by a coupling 2b. More specifically, as shown in FIGS. 6 and 7, an oval hole (hereinafter, oval hole) 2c is formed in the coupling 2b. The shaft portion 1c at the end of the oval work roll 1 is inserted into the oval hole 2c, and the work roll 1 and the spindle 2 are coupled.

  While the rolling mill 10 is in operation, the shaft 1c and the coupling 2b of the work roll 1 are fixed by a connecting pin cylinder. The connecting pin cylinder is embedded in a hole 2d penetrating from the outer peripheral surface of the coupling 2b to the inner wall surface of the oval hole 2c. During operation of the rolling mill 10, as shown in FIG. 8, the tip of the connecting pin cylinder 7 reaches the inside of the shaft portion 1 c of the work roll 1. At that time, the distal end portion of the connecting pin cylinder 7 is inserted into the connecting pin cylinder hole 1 e formed on the flat surface 1 d of the shaft portion 1 c of the work roll 1. Thereby, the coupling | bonding of the axial part 1c of the work roll 1 and the coupling 2b is fixed, and the coupling | bonding of the work roll 1 and the spindle 2 becomes firm.

  On the other hand, when the work roll 1 is removed from the rolling mill 10 for replacement, the pushing cylinder 8 attached to the stand 9 pushes the connecting pin cylinder 7 as shown in FIG. Is housed in the hole 2d of the coupling 2b. As a result, it is possible to uncouple the work roll 1 and the spindle 2.

  When the connecting pin cylinder hole 1e is worn due to the operation of the rolling mill 10 for a long time, the connecting pin cylinder 7 may be bent due to rattling. If the connecting pin cylinder 7 is bent, it takes a long time to replace the work roll 1, and if the bending is left, an excessive load is generated between the shaft portion 1 c of the work roll 1 and the coupling 2 b, A load is applied to the speed reducer 5 and the motor 6.

  As described above, when the connection between the work roll 1 and the coupling 2b is loosened, a load is applied to the speed reducer 5 and the motor 6, and there is a risk that a serious failure occurs. Therefore, a technique for maintaining the connection between the work roll 1 and the coupling 2b has been proposed. For example, Patent Document 1 describes a technique that eliminates any play on the inner wall of the coupling using a hydraulic chamber. Patent Document 2 describes a technique for improving wear resistance through overlay repair when a coupling is worn.

Japanese Utility Model Publication No. 6-70904 Japanese Patent Laid-Open No. 11-244919

  However, the technique described in Patent Document 1 has poor feasibility because it costs the cost of managing the hydraulic equipment in addition to the cost of newly installing the hydraulic equipment. In addition, there is a problem that it takes cost and time to perform the overlay repair described in Patent Document 2. Therefore, when overlaying repairing the connecting pin cylinder hole 1e, the repair time of the work roll 1 becomes longer than the replacement period of the work roll 1 of the rolling mill 10, and the operation may be stopped. Moreover, neither of the above-mentioned patent documents 1 and 2 describes the repair of the connecting pin cylinder hole 1e.

  The present invention has been made in view of the above, and an object thereof is to provide a work roll, a rolling mill, and a work roll repair method capable of repairing a connecting pin cylinder hole in a low cost and in a short time.

  In order to solve the above-described problems and achieve the object, a work roll according to the present invention is a work roll including a shaft portion fixed to a coupling by a connecting pin cylinder, and is detachably provided on the shaft portion. And an adapter having a connecting pin cylinder hole into which the connecting pin cylinder is inserted.

  Moreover, the rolling mill which concerns on this invention is equipped with the work roll of the said invention, It is characterized by the above-mentioned.

  Further, the work roll repair method according to the present invention is a work roll repair method including a shaft portion fixed to a coupling by a connection pin cylinder, wherein the connection pin cylinder provided in the shaft portion is inserted. Removing the adapter having the connecting pin cylinder hole and attaching a new adapter.

  According to the present invention, the connecting pin cylinder hole can be repaired at a low cost and in a short time.

Drawing 1 is a mimetic diagram showing a schematic structure of a rolling mill containing a work roll concerning one embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a schematic configuration of the work roll according to the present embodiment. FIG. 3 is a schematic diagram showing a schematic configuration of the work roll of the present embodiment. FIG. 4 is a diagram for explaining the operation of the connecting pin cylinder when the rolling mill of the present embodiment is in operation. FIG. 5 is a schematic diagram showing a schematic configuration of a rolling mill including a conventional work roll. FIG. 6 is a schematic view illustrating a schematic configuration of a conventional spindle coupling. FIG. 7 is a view for explaining the coupling between a conventional work roll and a coupling. FIG. 8 is a view for explaining the operation of a connecting pin cylinder for fixing the connection between the conventional work roll and the coupling. FIG. 9 is a view for explaining the operation of a connecting pin cylinder for fixing the connection between the conventional work roll and the coupling.

  Hereinafter, with reference to drawings, the work roll which is one embodiment of the present invention is explained in detail. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

  FIG. 1 is a diagram illustrating a schematic configuration of a drive system of a rolling mill including a work roll according to the present embodiment. As shown in FIG. 1, the work roll 1 of the rolling mill 10 is coupled to a spindle 2 and then coupled to a motor 6 via a pinion stand 3, a gear coupling 4, and a speed reducer 5. The driving force of the motor 6 is transmitted to the work roll 1 by the spindle 2 having the coupling 2b.

  2 and 3 are diagrams illustrating a schematic configuration of the shaft portion of the work roll 1 according to the present embodiment. As shown in FIG. 2, the shaft portion 1 c at the end of the work roll 1 has an oval cross section. The work roll 1 is coupled to the spindle 2 by inserting the shaft portion 1c into an oval hole formed in the coupling 2b.

  A connecting pin cylinder hole 1e is formed in each of two opposing flat surfaces 1d of the shaft portion 1c. During the operation of the rolling mill 10, the shaft 1c and the coupling 2b of the work roll 1 are fixed by the connecting pin cylinder. As shown in FIG. 4, the connecting pin cylinder 7 passes through the coupling 2 b and is inserted into the connecting pin cylinder hole 1 e of the shaft portion 1 c of the work roll 1. When the work roll 1 is removed from the rolling mill 10 for replacement, the connecting pin cylinder 7 is pulled back in the direction of the inside of the coupling 2b.

  In the work roll 1 of the present embodiment, the connecting pin cylinder hole 1e is formed on the bottom surface of the cylindrical adapter 11 that can be removed from the flat surface 1d. That is, as shown in FIG. 3, the adapter 11 having the connecting pin cylinder hole 1e is inserted into the adapter hole 1f formed in the flat surface 1d. At this time, the inner peripheral surface of the adapter hole 1 f and the outer peripheral surface of the adapter 11 are welded to form the welded portion 12. The welded portion 12 does not necessarily have to be formed over the entire surface in the axial direction (height direction) of the cylinder of the adapter 11. For example, the welded portion 12 may be formed by welding only a portion facing the flat surface 1d. The bottom surface of the adapter 11 in which the connecting pin cylinder hole 1e is formed, the flat surface 1d of the shaft portion 1c, and the welded portion 12 are welded so as to be flat within a predetermined tolerance range. Thereby, the connecting pin cylinder hole 1e is fixed to the flat surface 1d of the shaft portion 1c.

  The adapter 11 can be easily detached from the shaft portion 1c by cutting out the welded portion 12 using a grinder or the like. Therefore, when the connecting pin cylinder hole 1e is worn due to the operation of the rolling mill 10, the adapter 11 is removed, and then the new adapter 11 is inserted into the adapter hole 1f and welded again, so that the connecting pin cylinder hole 1e Repair is completed.

  As described above, in the present embodiment, when the connecting pin cylinder hole 1e is worn due to the operation of the rolling mill 10, the adapter 11 having the connecting pin cylinder hole 1e can be easily connected by replacing it with a new one. Repair of pin cylinder hole 1e is completed. Thus, according to the present embodiment, the connecting pin cylinder hole 1e can be repaired at a low cost and in a short time. Thereby, it is possible to prevent the occurrence of a serious failure due to an excessive load generated between the shaft portion 1c of the work roll 1 and the coupling 2b and the load applied to the speed reducer 5 or the motor 6. Further, it is possible to prevent the connecting pin cylinder 7 from being bent and the time required for replacing the work roll 1 from being lengthened.

  The shape of the adapter 11 is not limited to a cylindrical shape. For example, the adapter 11 may have a cylindrical shape with a polygonal bottom surface. In that case, the shape of the adapter hole 1 f is formed to be equal to the shape of the bottom surface of the adapter 11.

  Moreover, although the adapter 11 of the said embodiment was taken as two inserted in each of the two flat surfaces 1d which the shaft part 1c opposes, it is good also as one penetrating the flat surfaces 1d of the both sides of the shaft part 1c. . In that case, the connecting pin cylinder hole 1e is formed in both the bottom surfaces of this adapter 11, and the distance between both bottom surfaces is formed equal to the distance between the two flat surfaces 1d of the axial part 1c.

  When the adapter hole 1f is worn, a new adapter 11 that matches the shape of the adapter hole 1f may be inserted.

(Example)
A cylindrical adapter 11 having an outer diameter of 120 mm (tolerance +0.1 mm, −0.1 mm) was prepared, and a connecting pin cylinder hole 1 e having a diameter of 68 mm was provided on the bottom surface. The adapter 11 is inserted into an adapter hole 1f having a diameter of 120 mm (tolerance +0.1 mm, −0.1 mm) provided on the shaft 1c of the work roll 1, and the outer peripheral surface of the adapter 11 and the inner peripheral surface of the adapter hole 1f. And welded. The shaft portion 1c of the work roll 1 and the coupling 2b were joined, and the connecting pin cylinder was inserted into the connecting pin cylinder hole 1e via the coupling 2b, and then the rolling mill 10 was operated.

  When the rolling mill 10 was operated for one day, the work roll 1 was removed and roll grinding or maintenance was performed, and then the work roll 1 was attached again to prepare for the operation of the rolling mill 10 the next day. After repeating this cycle for 20 days, when the work roll 1 was removed and the state thereof was confirmed, it was confirmed that the adapter 11 and the welded portion 12 in the vicinity thereof were not chipped or cracked. Thereby, it was confirmed that the adapter 11 is applicable to actual operation.

  Further, when the connecting pin cylinder hole 1e is worn, it has been confirmed that the repair by replacing the adapter 11 is completed in about 3 hours.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Work roll 1c Shaft part 1d Flat surface 1e Connection pin cylinder hole 1f Adapter hole 2 Spindle 2b Coupling 5 Reduction gear 6 Motor 7 Connection pin cylinder 8 Extrusion cylinder 9 Stand 10 Rolling machine 11 Adapter

Claims (5)

A work roll having a shaft fixed to the coupling by a connecting pin cylinder,
A work roll comprising an adapter having a connection pin cylinder hole into which the connection pin cylinder is inserted, which is detachably provided in an adapter hole formed in the shaft portion. The work roll according to claim 1, wherein the adapter is welded to the work roll. Rolling mill, characterized in that it comprises a work roll according to claim 1 or 2. A method for repairing a work roll having a shaft portion fixed to a coupling by a connecting pin cylinder,
A method for repairing a work roll, comprising: removing an adapter provided in an adapter hole formed in the shaft portion and having a connection pin cylinder hole into which the connection pin cylinder is inserted, and attaching a new adapter. . 5. The work roll repair according to claim 4, wherein the adapter is welded to the work roll, and the step includes a step of removing the adapter from the work roll by cutting a weld. Method.

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