JPH08323406A - Descaling device for hat-treated roll - Google Patents

Abstract

PURPOSE: To improve working environment, also to quicken a descaling and to eliminate the irregularity in the scale separation and to raise the quality of roll in a descaling device of a heat-treated roll. CONSTITUTION: The descaling device 10 for the heat-treated roll consists of a elevating beam 15 which is supported to a jack 14 which is mounted on the stand 13 and a blade 18 provided with a knife edge 18A which is supported on the elevating beam 15, extended in the longitudinal direction of the roll l and touchable to and separable from the roll 1 and the blade 18 is supported on the elevating beam 15 through a buffer spring 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes scale generated on the surface of a roll heated to a high temperature during heat treatment.
The present invention relates to a scale removing device for heat treatment rolls.

[0002]

2. Description of the Related Art A cast roll has a weak structure in the as-cast condition and a large casting residual stress acts on it.
Generally, various heat treatments are performed to increase the internal toughness to improve the roll hardness, and to remove casting residual stress and to correct and homogenize the structure.

By the way, before the quenching in the heat treatment, the roll is heated to a high temperature in a heating furnace, so that a scale is generated on the roll surface. This scale not only hinders cooling when extracting the roll from the heating furnace and quenching it from the high temperature range, but uneven peeling of the scale causes uneven cooling of the roll surface, which affects the cooling rate. An optimum cooling curve for the material of the roll cannot be obtained, which adversely affects the quality.

Further, since this scale becomes an obstacle during roll machining in a later step, it is necessary to remove it quickly during heat treatment.

Conventionally, this scale removing work relies on manpower. That is, as shown in FIG. 5, the roll 1 extracted from the heating furnace is cooled while being rotated by a pair of turning rollers 2 and 2 provided near the furnace. The scale is removed by pressing the tip tool 4 against the surface of the roll 1 by using a pneumatic hammer 3 and supplying compressed air pressure to the hammer 3 to give forward vibration to the tip tool 4. .

[0006]

However, the prior art has the following problems. The surface of roll 1 immediately after being extracted from the heating furnace is 900 ° C
Since the temperature is extremely high and the worker works by approaching the roll 1, the working environment is extremely bad.

It takes about 20 to 20 minutes to completely remove the scale generated on the surface of the roll 1 along the length of the roll cylinder.
It takes as long as 25 minutes, and since it is a manual work, there is unevenness in scale removal, and unevenness in temperature occurs in the heat treatment in the subsequent process, which adversely affects the material structure.

An object of the present invention is to improve the work quality in a scale removing apparatus for heat treatment rolls, to improve the roll quality by speeding up the scale removal time and eliminating scale peeling unevenness.

[0009]

According to the present invention as set forth in claim 1, the scale produced on the surface of the roll heated to a high temperature during the heat treatment is rotatively cooled by a pair of turning rollers of the roll rotator. In a scale removing device for heat treatment rolls to be removed inside, a pedestal installed below the pair of turning rollers of the roll rotating device, a lifting beam supported by a jack mounted on the pedestal, and a roll supported by the lifting beam. The blade is provided with a knife edge extending in the longitudinal direction and capable of coming into contact with and separating from the roll, and the blade is supported by the lifting beam via a buffer spring.

According to a second aspect of the present invention, in the first aspect of the present invention, a saw-like notch is provided in the longitudinal direction of the knife edge of the blade.

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the blade is divided in the longitudinal direction of the roll.

[0012]

According to the present invention as set forth in claim 1, the following effects are obtained. By adjusting the elevation of the elevation beam by the jack, the knife edge of the blade can be pressed against the roll surface by the optimum pressing force of the buffer spring, and the scale generated on the roll surface can be stripped off at once in the roll longitudinal direction. As a result, it is possible to improve the work environment as in the conventional manual work, to speed up the scale removal time and eliminate the scale peeling unevenness. Further, since there is no uneven peeling of the scale, there is no uneven cooling of the roll surface during quenching, and the roll quality can be improved.

The present invention according to claim 2 has the following effects. By providing a saw-shaped notch in the longitudinal direction of the knife edge of the blade, the biteability of the knife edge to the scale can be improved.

The present invention according to claim 3 has the following effects. By dividing the blade in the roll longitudinal direction,
To keep the contact state between the blade and the roll surface good in the entire roll longitudinal direction against the runout of the roll rotation axis due to the vibration of the roll during rotation cooling of the roll and the difference in the peeling state of the scale in the roll longitudinal direction. You can

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the entire process of a scale removing device, FIG. 2 is a side view of FIG. 1, FIG. 3 is a schematic diagram showing a jack and a lifting beam, and FIG. 4 is a lifting beam and a blade. FIG. 5 is a schematic diagram showing a conventional example.

As shown in FIGS. 1 and 2, the scale removing device 10 removes the scale produced on the surface of the roll 1 heated to a high temperature during the heat treatment of the cast rolling roll 1 from a pair of roll rotating devices 11. Turning rollers 12, 12
It is to be removed during the rotation cooling of the roll 1 by.

The scale removing device 10 includes a pedestal 13 installed along the longitudinal direction of the roll rotator 11 below the pair of turning rollers 12 of the roll rotator 11, and left and right attached to both ends of the gantry 13. Screw jacks 14, 14 and a lifting beam 15 supported by both jacks 14, 14. As shown in FIGS. 1 to 3, the left and right screw jacks 14 and 14 are connected to a worm shaft 16 and are driven by a rotating operation applied to a handle 17 provided at one end of the worm 16 to lift and lower the beam 15.
Can be moved up and down.

The scale removing device 10 includes a lifting beam 15
The blade 18 is supported on the upper end of the. Blade 18
Is provided with a knife edge 18A that extends in the longitudinal direction of the roll 1 being rotated by the roll rotating device 11 and that can be brought into and out of contact with the roll 1 by elevating the elevating beam 15.

At this time, the scale removing device 10 operates as shown in FIG.
As shown in (A), a plurality of support fittings 19 are fixed to the upper surface of the elevating beam 15, and a blade 18 is fitted and supported on the upper end of a buffer spring 20 fitted to each support fitting 19.

The scale removing device 10 is shown in FIG.
As shown in (B), the knife edge 18A of the blade 18
A saw-shaped notch 18B is provided in the longitudinal direction.

In the scale removing device 10, the blade 18 is divided in the longitudinal direction of the roll 1 (3 divisions in FIG. 1).
are doing.

The operation of this embodiment will be described below. By adjusting the elevation of the elevation beam 15 by the jack 14, the blade 1 can be pressed by the buffer spring 20 with an optimum pressing force.
The knife edge 18A of No. 8 can be pressed against the roll surface to remove the scale generated on the roll surface at a stretch in the roll longitudinal direction. As a result, it is possible to improve the work environment as in the conventional manual work, to speed up the scale removal time and eliminate the scale peeling unevenness. And since there is no peeling unevenness of the scale,
Uneven cooling of the roll surface during quenching is eliminated, and roll quality can be improved.

By providing the saw-shaped notch 18B in the longitudinal direction of the knife edge 18A of the blade 18, the biteability of the knife edge 18A to the scale can be improved.

By dividing the blade 18 in the lengthwise direction of the roll, the roll 18 is eccentric to the blade 18 due to vibration of the roll during rotation and cooling of the roll due to vibration of the roll, and difference in scale peeling state in the lengthwise direction of the roll. The contact state with the roll surface can be kept good in the entire region in the longitudinal direction of the roll.

Table 1 shows the scale removal time, the presence / absence of scale peeling unevenness, the work safety and the roll quality in the work using the scale removing apparatus 10 of the present invention in comparison with those of the conventional manual work. Is.

[Table 1]

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention.

[0027]

As described above, according to the present invention, in the scale removing apparatus for heat treatment rolls, the working environment is improved, the scale removal time is shortened, the scale peeling unevenness is eliminated, and the roll quality is improved. it can.

[Brief description of drawings]

FIG. 1 is a schematic view showing an entire process of a scale removing device.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic view showing a jack and a lifting beam.

FIG. 4 is a schematic view showing a lifting beam and a blade.

FIG. 5 is a schematic view showing a conventional example.

[Explanation of symbols]

 1 Roll 10 Scale Removing Device 11 Roll Rotating Device 12 Turning Roller 13 Stand 14 Jack 15 Elevating Beam 18 Blade 18A Knife Edge 18B Notch 20 Buffer Spring

Claims (3)

[Claims] 1. A scale removing device for a heat treatment roll, which removes scale generated on the surface of a roll heated to a high temperature during heat treatment during rotation cooling of the roll by a pair of turning rollers of the roll rotating device. A pedestal installed below the middle of a pair of turning rollers of the apparatus, an elevating beam supported by a jack mounted on the pedestal, and a supporting beam supported by the elevating beam extending in the longitudinal direction of the roll and capable of contacting and separating from the roll. A scale removing device for heat treatment rolls, comprising: a blade having a knife edge, the blade being supported by an elevating beam via a buffer spring. 2. The scale removing device for a heat treatment roll according to claim 1, wherein a saw-shaped notch is provided in a longitudinal direction of a knife edge of the blade. 3. The scale removing device for a heat treatment roll according to claim 1, wherein the blade is divided in the longitudinal direction of the roll.