JP6040953B2 - Roll hole polishing machine - Google Patents

Description

  The present invention relates to a roll hole type polishing apparatus for polishing a hole type of a hole rolling roll, for example, polishing an inner surface of a hole mold formed on a hole rolling roll for rolling a shape steel such as a railroad rail. It is suitable for this.

  Shape steel such as railroad rails is generally manufactured by hot rolling. In hot rolling, after a raw material is heated, rolling is performed by various shapes of rolling rolls such as a cylindrical rolling roll and a perforated rolling roll in each step of rough rolling, intermediate rolling, and finish rolling. In the hot rolling of the shape steel, when a local load is applied to the circumferential surface (rolled material contact surface) of the rolling roll, roughening occurs on the circumferential surface of the rolling roll. The problem due to the rough surface of the rolling roll becomes more prominent because the difference in peripheral speed increases in the radial direction, particularly when rolling with a complicated cross-sectional shape. When roughening occurs on the peripheral surface of the rolling roll, that is, the contact surface with the rolled material, unevenness transfer wrinkles may occur on the rolled material after rolling due to rough surface unevenness. Furthermore, local increase in the friction coefficient occurs due to the rough surface of the roll surface, and the rolled material tends to be seized onto the roll surface. As a result, it causes caulking and seizure on the shaped steel. Therefore, in order to remove the generated rough surface of the roll surface, it is necessary to stop the rolling line and perform maintenance with a grinder, and the productivity is lowered.

  Therefore, a technique has been proposed in which the rolling roll is polished simultaneously during normal operation without stopping the rolling line. For example, Patent Document 1 below discloses a technique in which a polishing apparatus including a rotating unit, a feeding unit, and a moving unit is installed, and the peripheral surface and side surfaces of the rolling roll are polished by this polishing apparatus. Patent Document 2 below discloses a technique in which a polishing device is disposed in a roll chock of a universal mill or inside thereof, and a flat portion on a side surface of a horizontal roll is polished by the polishing device.

JP-A-8-300015 JP 2004-249358 A

By the way, since the difference of the circumferential speed of a roll radial direction arises as mentioned above in the end surface of a hole type roll axial direction of a hole-type rolling roll, it is easy to produce rough skin. The end surface in the roll axis direction of the hole mold in this case includes not only a surface perpendicular to the roll axis direction in the hole mold but also a surface intersecting with the roll axis direction. However, even if the roll polishing apparatus described in any of the above patent documents can polish a surface parallel to the hole roll axis of the hole rolling roll, that is, a rotating peripheral surface, Since the polishing member cannot be pressed against the end surface in the direction, it is not suitable for polishing the end surface in the roll axis direction of the hole type.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a roll hole type polishing apparatus capable of polishing a hole type end surface in the roll axial direction. .

In order to solve the above problems, a roll hole type polishing apparatus according to an aspect of the present invention is a roll hole type polishing apparatus for polishing an end surface in the roll axial direction of a hole mold of a hole rolling roll, wherein the hole A polishing member for polishing the end surface in the roll axis direction of the mold, a pressing mechanism that generates a pressing force in the roll axis direction of the perforated rolling roll and presses the polishing member against the end surface in the roll axis direction of the perforated mold, A holding member that holds the polishing member; and a transmission member that is disposed between the holding member and the pressing mechanism and transmits the pressing force of the pressing mechanism to the polishing member. A member is attached to the front end of the perforated rolling roll in the radial direction of the roll, and is extended in the radial direction of the roll so as to be inserted into the perforated form of the perforated rolling roll, and the roll axial direction of the pressing mechanism Input receiving pressure And parts, and is characterized in that a connecting portion for connecting the extended portion and the input portion.
The end surface of the hole-type roll axis direction includes not only a surface perpendicular to the roll axis direction of the hole-type rolling roll but also a surface intersecting the roll axis direction. Further, the roll axis direction includes not only a direction that coincides with the roll axis of the perforated rolling roll but also a direction parallel to the roll axis.

In this roll hole type polishing apparatus, it is preferable that the extending portion and the input portion are connected in a crank shape via the connecting portion.
Further, in this roll hole type polishing apparatus, it is desirable to dispose a pressing member adjacent to the connecting portion in the roll circumferential direction of the hole rolling roll.
Moreover, in this roll hole type polishing apparatus, it is desirable that the pressing mechanism includes a propulsion device that advances and retreats in the roll axis direction and an elastic member interposed between the propulsion device and the input unit.

  Thus, according to the roll hole type polishing apparatus of the present invention, when polishing the hole end surface in the roll axis direction of the hole type roll, the polishing member for polishing the end surface in the roll axis direction of the hole type is held. Hold with a member. Further, a pressing mechanism is provided that generates a pressing force in the roll axis direction of the perforated rolling roll to press the polishing member against the end surface of the perforated roll axis direction. A transmission member that transmits the pressing force of the pressing mechanism to the polishing member is disposed between the pressing mechanism and the holding member. This transmission member is long in the roll radial direction so as to be inserted into the hole mold of the hole-type rolling roll, and has an extending portion to which a holding member is attached at the tip end in the roll radial direction, and a pressing mechanism in the roll axial direction. The input part which receives a pressure, and the connection part which connects an extending part and an input part are provided. Therefore, since the polishing member can be pressed against the end surface of the hole-type roll axis in the roll axis direction by the pressing force in the roll axis direction of the pressing mechanism, the end surface of the hole-type roll axis in the roll axis can be polished. . At this time, if the extending portion of the transmission member and the input portion are connected in a crank shape by the connecting portion, the length of the extending portion elongated in the roll radial direction inserted into the hole mold is shortened. The rigidity can be increased and the end surface in the roll axis direction of the hole mold can be properly polished.

In addition, by connecting the extending portion of the transmission member and the input portion in a crank shape via the connecting portion, the length of the extending portion elongated in the roll radial direction inserted into the hole mold can be shortened to increase the rigidity. The end face of the roll axis in the roll axis direction can be properly polished. Also, the polishing member is pressed against the end face in the roll axis direction of the hole roll of the perforated rolling roll by the pressing mechanism, and When the roll is rotated, the transmission member tends to rotate in the roll circumferential direction due to the contact resistance between the perforated rolling roll and the polishing member. By disposing the pressing member adjacently in the roll circumferential direction of the connecting portion, it is possible to prevent the transmission member from rotating in the roll circumferential direction.

  Further, when the abrasive member is pressed against the end surface in the axial direction of the roll axis of the perforated rolling roll by the pressing mechanism, and the rolled material is rolled by rotating the perforated rolling roll in this state, the rolled material bites into the perforated rolling roll. The perforated rolling roll is moved in the roll axial direction by the thrust force generated when it is inserted. At this time, if the abrasive member is rigidly pressed against the end surface in the roll axis direction of the perforated rolling roll, the brittle abrasive member is lost. By interposing an elastic member between the propulsion device of the pressing mechanism and the input portion of the transmission member, the polishing member can be elastically pressed against the end surface of the hole-type roll axial direction of the hole-type rolling roll. It is possible to prevent the abrasive member from being damaged when biting.

It is a schematic block diagram which shows one Embodiment of the shape steel rolling machine with which the roll hole type grinding | polishing apparatus of this invention was applied. It is explanatory drawing of the perforated rolling roll used for the shape rolling mill of FIG. It is a top view of the roll hole type | mold grinding | polishing apparatus attached to the shape steel rolling mill of FIG. FIG. 4 is a left side view of the roll hole type polishing apparatus of FIG. 3. It is explanatory drawing of the rolling line stop time before and after implementation of the roll hole type grinding | polishing at the time of rolling by the roll hole type grinding | polishing apparatus of FIG.

  Next, an embodiment of the roll hole type polishing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a shape rolling mill to which the roll hole type polishing apparatus of the present embodiment is applied. In the present embodiment, in the hot rolling step, for example, the rolled material S is fed into the shape rolling mill 1 from the right side of FIG. 1 and the rolled material S is discharged to the left side of FIG. In shape steel rolling, reciprocating (reverse) rolling may be performed. The shape steel rolling mill 1 arranges the perforated rolling rolls 2 above and below the conveying line of the rolled material S, and rolls the rolled material S passing through the upper and lower perforated rolling rolls 2. The shaped steel rolled in this embodiment is, for example, a railroad rail. In the present embodiment, the roll axis direction of the perforated rolling roll 2 includes a direction parallel to the roll axis in addition to the direction corresponding to the roll axis of the perforated rolling roll 2. Similarly, the roll radial direction includes a direction parallel to the roll radial direction in addition to the direction coinciding with the roll radial direction. Similarly, the roll circumferential direction includes a direction parallel to the roll circumferential direction in addition to the direction coinciding with the roll circumferential direction.

  In the present embodiment, the roll chock 3 that supports both axial ends of the upper and lower perforated rolling rolls 2 is connected by a rest bar 4, and protrudes from the rest bar 4 toward the perforated rolling roll 2 in the rolling material entry side direction. A roll hole type polishing apparatus 6 is attached to the mount 5. FIG. 2 is an explanatory diagram of the hole mold 8 of the hole-type rolling roll 2. In the perforated rolling roll 2, rolling is performed by pushing the rolled material S into the perforated mold 8 formed on the outer peripheral surface 7 of the roll and continuing in the circumferential direction. In the hole mold 8, the surface extending in the vertical direction in FIG. 2 is the roll axial end surface 9, and as described above, the roll axial end surface 9 is caused by the difference in the circumferential speed in the roll radial direction. Prone to rough skin. In the present embodiment, the roll axial end surface 9 on the right side in the figure of the hole mold 8 is constantly polished by the roll hole polishing apparatus 6 attached to the mount 5.

  3 is a plan view of the roll hole type polishing apparatus 6 of the present embodiment, and is a view of the roll hole type polishing apparatus 6 for polishing the roll hole type of the upper roll in FIG. 1 as viewed from above. FIG. 4 is a left side view of the roll hole type polishing apparatus 6 of FIG. Here, the configuration of the roll hole type polishing apparatus for polishing the roll hole type of the lower roll is that in which the roll hole type of the upper roll is polished symmetrically, and detailed description thereof is omitted. The roll hole type polishing apparatus 6 is attached to the upper surface of the tip of the mounting base 5. A bracket 11 fixed to the housing 10 is fixed to the top surface of the tip of the mounting base 5 via a fixing tool 12 such as a bolt. The housing 10 elongated in the roll axial direction has a circular hole 13 whose axis is directed in the roll axial direction, and guide grooves parallel to a plane including the roll axial direction and the roll radial direction on the perforated rolling roll side of the circular hole 13. 14 are formed. A flat plate-like transmission member 15 is inserted into the guide groove 14, and is supported so as to be slidable in the roll axis direction along the guide groove 14. Further, a hydraulic cylinder 16 as a propulsion device is disposed on the left side of the circular hole 13 shown in FIG. 3, and a coil spring 17 as an elastic member is disposed on the right side thereof. This is in contact with the input portion 18 of the transmission member 15. Accordingly, the pressing force of the hydraulic cylinder 16 is transmitted to the transmission member 15 via the coil spring 17. A hydraulic cylinder 16 constitutes a pressing mechanism 24 for the coil spring 17.

  The transmission member 15 is formed with an extending portion 19 extending in the roll radial direction so as to be inserted into the hole mold 8 from the housing 10 side, and the extending portion 19 and the input portion 18 are arranged in the roll axial direction. Are connected by a long connecting portion 20. In the present embodiment, the extending portion 19 and the input portion 18 are connected in a crank shape by the connecting portion 20. The connecting portion 20 of the transmission member 15 is substantially inserted into the guide groove 14 of the housing 10 and guided by the guide groove 14. A holding member 21 is attached by welding or the like to the projecting direction tip of the extended portion 19, that is, the hole-type tip of FIG. The holding member 21 is formed with a holding hole whose axis is set in the roll axis direction, and a polishing member 22 elongated in the roll axis direction is accommodated and held in the holding hole. In addition, a pressing member 23 that is long in the roll axis direction is disposed in a portion of the housing 10 adjacent to the connecting portion 20 of the transmission member 15 in the roll circumferential direction.

  In this roll hole type polishing apparatus 6, the pressing force of the hydraulic cylinder 16 is input from the input portion 18 to the transmission member 15 via the coil spring 17, and transmitted from the connecting portion 20 of the transmission member 15 to the extending portion 19. The polishing member 22 held by the holding member 21 is pressed against the end surface 9 in the roll axis direction of the hole mold 8, and the end surface 9 in the roll axis direction is polished. Therefore, if the hydraulic pressure is supplied to the hydraulic cylinder 16 even during the hot rolling operation of the shape steel, the roll axial end face 9 of the hole mold 8 of the hole rolling roll 2 is polished without stopping the rolling line. be able to. As described above, the roll axis direction end surface 9 of the hole mold 8 is likely to be rough due to the difference in the peripheral speed in the roll radial direction. Therefore, the productivity is improved by polishing the end surface 9 in the roll axial direction of the hole mold 8 at all times during the hot rolling operation of the shape steel.

  During the hot rolling operation of the shape steel, the perforated rolling roll 2 is of course rotating, so that the polishing member 22 pressed against the end face 9 in the roll axial direction of the perforated mold 8 rotates in the circumferential direction of the roll due to contact resistance. try to. This rotational force is transmitted to the transmission member 15, and the transmission member 15 tries to rotate in the roll circumferential direction. By arranging the pressing member 23 adjacent to the connection portion 20 in the roll circumferential direction, the transmission member 15 rolls in the roll circumferential direction. Can be prevented from rotating. Further, during the hot rolling operation of the shape steel, a thrust force is generated when the rolled material S is bitten by the perforated rolling roll 2, and the perforated rolling roll 2 moves in the roll axis direction by the thrust force. In the present embodiment, the coil spring 17 is interposed between the hydraulic cylinder 16 of the pressing mechanism 24 and the input portion 18 of the transmission member 15, so that the polishing member 22 is elastically moved to the hole mold 8 of the hole rolling roll 2. Can be pressed against the end surface 9 in the roll axis direction, and the loss of the abrasive member 22 that is a brittle material can be prevented when the rolled material is caught.

  FIG. 5 is an explanatory diagram of the rolling line stop time and the number of stops before and after the roll hole type polishing during rolling by the roll hole type polishing apparatus. The left vertical axis in the figure indicates the line stop time due to roll maintenance per 1000 T (1 kT) of the rolled material, and the right vertical axis in the figure indicates the number of line stops due to roll maintenance per 1000 T (1 kT) of the rolled material. As is apparent from the figure, before carrying out the roll hole type polishing at all times, a stop time of 19 min / kT and a stop count of 1.4 are required in order to clean the rough surface of the end surface in the axial direction of the hole of the hole roll. The line was stopped at times / kT, but no line stop occurred after the roll hole type polishing was always performed. This is considered to be due to the suppression of the growth of rough skin by continuously removing the rough skin of the end surface in the roll axis direction of the hole type at a minute stage.

  Thus, in the roll hole type polishing apparatus of this embodiment, when polishing the roll axial end surface 9 of the hole mold 8 of the hole rolling roll 2, the polishing for polishing the roll axial end surface 9 of the hole mold 8 is performed. The member 22 is held by the holding member 21. Further, a pressing mechanism 24 that generates a pressing force in the roll axis direction of the hole-type rolling roll 2 and presses the polishing member 22 against the end surface 9 in the roll axis direction of the hole mold 8 is provided. A transmission member 15 that transmits the pressing force of the pressing mechanism 24 to the polishing member 22 is disposed between the pressing mechanism 24 and the holding member 21. The transmission member 15 is long in the roll radial direction so as to be inserted into the hole mold 8 of the hole rolling roll 2, and the extending portion 19 to which the holding member 21 is attached at the tip end in the roll radial direction, and the pressing mechanism 24. An input unit 18 that receives a pressing force in the roll axis direction, and an extension unit 19 and a connection unit 20 that connects the input unit 18 are provided. Therefore, the polishing member 22 can be pressed against the end surface 9 in the roll axis direction of the hole mold 8 by the pressing force in the roll axis direction of the pressing mechanism 24 via the transmission member 15. 9 can be polished. At this time, if the extending portion 19 of the transmission member 15 and the input portion 18 are connected in a crank shape by the connecting portion 20, the extending portion 19 elongated in the roll radial direction inserted into the hole mold 8. The length is shortened to increase the rigidity, and the end surface 9 in the roll axial direction of the hole mold 8 can be properly polished.

Further, by connecting the extending portion 19 of the transmission member 15 and the input portion 18 in a crank shape via the connecting portion 20, the length of the extending portion 19 that is long in the roll radial direction and inserted into the hole mold 8. The end face 9 in the roll axis direction of the hole mold 8 can be properly polished, and the polishing member 22 is removed from the roll axis of the hole mold 8 of the hole rolling roll 2 by the pressing mechanism 24. When the perforated rolling roll 2 is rotated while being pressed against the direction end face 9, the transmission member 15 tries to rotate in the circumferential direction of the roll due to the contact resistance between the perforated rolling roll 2 and the polishing member 22. By disposing the pressing member 23 adjacent to the connecting portion 20 in the roll circumferential direction, the transmission member 15 can be prevented from rotating in the roll circumferential direction.

  Further, when the polishing member 22 is pressed against the roll axial end surface 9 of the hole mold 8 of the hole rolling roll 2 by the pressing mechanism 24, and the rolled material S is rolled by rotating the hole rolling roll 2 in this state, the rolled material is obtained. The perforated rolling roll 2 moves in the roll axis direction by the thrust force generated when S is caught in the perforated rolling roll 2. At this time, if the polishing member 22 is firmly pressed against the end surface 9 in the roll axial direction of the hole mold 8 of the hole rolling roll 2, the brittle polishing member 22 is lost. By inserting a coil spring (elastic member) 17 between the hydraulic cylinder (propulsion device) 16 of the pressing mechanism 24 and the input part 18 of the transmission member, the polishing member 22 is elastically made into the hole type of the hole rolling roll 2. 8 can be pressed against the end surface 9 in the roll axis direction, and the loss of the polishing member 22 when the rolled material is caught can be prevented.

In the above-described embodiment, a hydraulic cylinder is used as the propulsion device, but an actuator such as a hydraulic cylinder, an air cylinder, or an electric motor can be used instead. Moreover, in the said embodiment, although the coil spring was used as an elastic member, it can replace with this and can also use elastic members, such as a disk spring and rubber | gum.
Moreover, in the said embodiment, although the rail of the railway was mentioned as an example as a shape steel, the roll hole type | mold grinding | polishing apparatus of this invention was used for rolling of various shape steels including H shape steel and a mast rail. The present invention can be similarly applied to a perforated rolling roll.

DESCRIPTION OF SYMBOLS 1 Shape rolling mill 2 Hole rolling roll 3 Roll chock 4 Rest bar 5 Mounting stand 6 Roll hole type polishing apparatus 7 Roll outer peripheral surface 8 Hole type 9 Roll axial direction end surface 10 Housing 11 Bracket 12 Fixing tool 13 Circular hole 14 Guide groove 15 Transmission Member 16 Hydraulic cylinder (propulsion device)
17 Coil spring (elastic member)
DESCRIPTION OF SYMBOLS 18 Input part 19 Extension part 20 Connection part 21 Holding member 22 Polishing member 23 Holding member 24 Pressing mechanism S Rolling material

Claims (4)

Among the hole molds of the hole-type rolling roll, a roll hole type polishing apparatus for polishing the end surface in the roll axial direction,
A polishing member for polishing the end surface in the roll axial direction of the hole type;
A pressing mechanism that generates a pressing force in the roll axis direction of the hole-type rolling roll and presses the polishing member against the end surface of the hole-type roll axis.
A holding member for holding the polishing member;
A transmission member disposed between the holding member and the pressing mechanism, and transmitting a pressing force of the pressing mechanism to the polishing member;
The transmission member is
The holding member is attached to the end of the roll-type rolling roll in the radial direction of the roll, and an extending portion that is long in the radial direction of the roll so as to be inserted into the hole-type of the rotary-type roll
An input unit that receives a pressing force in the roll axis direction of the pressing mechanism;
A roll hole type polishing apparatus comprising: a connecting portion that connects the extending portion and the input portion.   The roll hole type polishing apparatus according to claim 1, wherein the extending portion and the input portion are connected in a crank shape via the connecting portion.   The roll hole type polishing apparatus according to claim 1, wherein a pressing member is disposed adjacent to the connecting portion in a roll circumferential direction of the hole rolling roll. The pressing mechanism is
A propulsion device that advances and retreats in the roll axis direction;
The roll hole type polishing apparatus according to claim 1, further comprising an elastic member interposed between the propulsion device and the input unit.

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