JPH07156022A - Scale eliminating device for heat treated roll - Google Patents

Abstract

PURPOSE:To provide a scale eliminating device suitable for eliminating scale adhering on a heat treated roll surface. CONSTITUTION:Scales produced on the surface of a heat treated roll 4, which is rotationally cooled by a pair of turning rollers 3, 3, are eliminated by using a chipping hammer 1. A scale eliminating device consists of rails 11 arranged parallelly with the tuning rollers 3, 3, a frame 13 mounted on the rails 11, a moving cylinder freely moving the frame 13 on the rails 11, and a pressing cylinder 15, which is installed on the frame 13 and holds the chipping hammer 1 at the preset inclination angle freely movably forward/backward. In this way, the scales produced on the surface of the roll 4 can be automatically eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scale removing device used for removing scale adhering to a heat-treated roll surface.

[0002]

2. Description of the Related Art Conventionally, a cast roll has a coarse and fragile structure in the as-cast condition and a large casting residual stress acts on it. Therefore, the internal toughness of the cast roll is increased to improve the roll hardness and the cast residual stress. Various heat treatments are generally performed for removal and correction / homogenization of the tissue.

By the way, during the heat treatment, since it is heated to a high temperature, scale is generated on the roll surface. Since this scale becomes an obstacle during roll processing in a later process, it is promptly removed after the heat treatment. This scale removal work has conventionally relied on manual labor. That is, as shown in FIG. 2, the roll extracted from the heat treatment furnace is cooled while being rotated by a pair of turning rollers 3 and 3 provided near the furnace. But
The scale is removed by pressing the tip tool 2 against the surface of the roll 4 by using a pneumatic hammering hammer 1 of about 1.5 m and supplying compressed air pressure to give forward and backward vibration.

[0004]

However, the above-mentioned conventional scale removing means has the following problems. That is, the surface of the roll 4 immediately after being taken out from the heat treatment furnace is about 90
Since it is as hot as 0 ° C and the work is performed close to the roll 4, it is extremely dangerous and unsafe work. It takes about 20 to 25 minutes to completely remove the scale generated on the surface of the roll 4 in the lengthwise direction of the body, but during that time, it is necessary to perform the standing work with the hammer 1 for lifting. It's going to be quite a heavy task. Since it is a manual process, unevenness in scale removal occurs, and temperature unevenness occurs in the heat treatment in the subsequent process, which affects the material structure. And so on.

Although it is conceivable to remove the scale by using the well-known shot blast technique,
Since it is necessary to equip various equipment such as collection of shots and grids, prevention of noise due to impact noise, and prevention of dust emission, the equipment cost required for that is huge and the initial cost is high, and it is necessary to support worn shots and grids. There are economic disadvantages such as high running costs. Further, technically, since there is an optimum basic cooling curve for the material of the roll, there is a problem that quality is affected when the cooling rate is affected.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a scale removing apparatus for heat treatment rolls, which enables automation to save labor and safety. And

[0007]

SUMMARY OF THE INVENTION The present invention is an apparatus for removing scales generated on the surface of a heat treatment roll which is rotated and cooled by a roll rotation device by using a hammer and is installed in parallel with the rotation device. Rails, a mount mounted on the rails, a moving cylinder that allows the mounts to move on the rails, and a lifter hammer that is mounted on the mounts and that can hold the lift hammer at a predetermined tilt angle. It is a scale removing device for heat treatment rolls.

The tilt angle of the hammer is 36.5.
It is desirable to set it within the range of up to 43.0 °.

[0009]

[Operation] In order to solve the above-mentioned problems, the present inventor has earnestly studied two points of efficient scale removal, which is a bottleneck in automating scale removal work, and sharing with rolls having different diameters. As a result of repeated research and experiments, the following findings were obtained, and the present invention was completed based on these findings.

First, as for the first neck, as shown in FIG. 3, when the scale of the roll 4 is removed, a vertical line V when the tip tool 2 of the hammer 1 contacts the point A on the surface of the roll 4. The degree of the removal was investigated while changing the angle θ with respect to, and the results are shown in Table 1.

[0011]

[Table 1]

As is apparent from this table, the contact angle θ is
It has been found that the scale can be effectively removed at 50 to 70 °. Next, regarding the second neck,
As shown in FIG. 4, three rolls 4 having different diameters are provided.
When 4 ′ and 4 ″ are placed on the turning rollers 3 and 3, a straight line S of the trajectory when the tip tool 2 makes contact at the same angle θ with any roll is drawn, and the inclination angle α of the straight line S with respect to the horizontal line H As a result, when the contact angle θ is changed in the range of 50 to 70 °, the inclination angle α becomes 36.5.
It was found to be in the range of ~ 43.0 °. Therefore, if the tip tool 2 is moved at an angle in the range of 36.5 to 43.0 °, the same tip tool 2 can be used even if the diameter of the roller 4 changes.
Can be used to remove scale.

Incidentally, the moving distance of the tip tool 2 at that time may be physically determined in consideration of the minimum value and the maximum value of the diameter of the roll 4 on which the scale removal processing is performed. For example, when the minimum value of the diameter of the roller 4 is 500 mmφ and the maximum value is 1000 mmφ, the difference between the maximum value and the minimum value, that is, about 500 mm, is sufficient including the retracted portion.

By constructing the scale removing device of the present invention based on such conditions, the lifting hammer is automatically operated in synchronization with the rotating roll, and the scale generated on the roll surface is efficiently Can be removed.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention. In the figure, 10 is a scale removing device,
Turning roller 3, for cooling the heat-treated roll 3,
3 are provided in the vicinity of the side surface at a predetermined interval. 11 is the base 12
Is a rail laid parallel to the axial direction of the turning rollers 3 and 3, and its length is slightly longer than the body length of the roll 4.

Reference numeral 13 is a mount mounted on the rail 11.
Reference numeral 14 is a moving cylinder that allows the base 13 to move on the rail 11. Reference numeral 15 is a pressing cylinder, which is supported by a support member 16 erected on the pedestal 13 via pins 17. Reference numeral 18 denotes a support frame that is attached to the rod 15a of the pressing cylinder 15 and horizontally supports the hanging hammer 1. 19 is a support stand 20
It is a first guide roller that is supported by and guides the rod 15a of the pressing cylinder 15 by sandwiching it vertically. A second support 21 is supported by a support base 22 and supports the rod 15a from below.
Is a guide roller.

Therefore, the inclination angle α of the pressing cylinder 15 is
When the angle is set to any angle in the range of 36.5 to 43.0 °, the contact angle θ of the tip tool 2 with the roll 4 can be set in the range of 50 to 70 °. For example, when α is 39 °, the contact angle θ can be 60 °. Also, the stroke of the pressing cylinder 15 is physically determined by the diameter of the roll to be processed.

Then, the pressing cylinder 15 is actuated to move the lifting hammer 1 forward until just before the tip tool 2 contacts the surface of the roll 4, and then compressed air pressure is supplied to the lifting hammer 1, so that the tip tool 2 advances further. Then roll 4
Then, the scale is removed by continuously moving forward and backward by its reaction force. The operation is stopped when the time for one lap of the roll has passed.

Next, after the tip tool 2 is separated from the surface of the roll 4 by the pressing cylinder 15, the moving cylinder 14 is operated to move laterally by the width of the tip tool 2, and then the tip tool 2
Is again advanced to contact the surface of the roll 4 to remove the scale on the next outer peripheral surface. By repeating such an operation, scale removal can be performed over the entire length of the body of the roll 4.

[0020]

As described above, according to the present invention,
Since the hanging hammer can be automatically operated in synchronism with the rotating roll, various effects such as labor saving, release from dangerous work, and improvement of work efficiency can be brought about.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional example.

FIG. 3 is an explanatory view of a contact angle of a hanging hammer tip tool.

FIG. 4 is an explanatory diagram of a tilt angle of a pressing cylinder.

[Explanation of symbols] 1 Lifting hammer 2 Tip tool 3 Turning roller 4 Roll 10 Scale remover 11 Rail 13 Stand 14 Moving cylinder 15 Pressing cylinder 19 First guide roller 21 Second guide roller

Claims (2)

[Claims] 1. A device for removing scales generated on the surface of a heat treatment roll which is rotatively cooled by a roll rotating device by using a hammer, the rail being installed in parallel with the rotating device, and the rail. A mount mounted on the mount, a moving cylinder that allows the mount to move on the rail, and a pressing cylinder that is mounted on the mount and that holds the swing hammer at a predetermined tilt angle so that the mount hammer can advance and retreat. Characteristic heat treatment roll scale removing device. 2. The tilt angle of the hammer is 36.5 to
The scale removing apparatus for a heat treatment roll according to claim 1, wherein the scale removing range is 43.0 °.