JPS5937291Y2 - Roll grinding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grinding device for finishing rolls for hot rolling mills.More specifically, the present invention relates to a grinding device for finishing rolls for hot rolling mills.
The present invention relates to a roll grinding device capable of grinding in the state of f.

The roll surface of the work roll in a hot rolling mill is worn and deformed due to long-term use, or the roll surface becomes rough, reducing rolling accuracy. are doing.

Grinding of rolls is usually done using a roll grinding machine, so conventionally the rolled rolls are removed from the stand and transported to a roll shop, and then the chocks are disassembled from the rolls and installed on the grinding machine. It was grinding.

Therefore, roll grinding work is large-scale and takes a long time, and production interruptions due to roll changes last for a long time.

One way to deal with this is to dismantle the role.
I-<, a method of grinding on a line using a grindstone or a grinding heald has been considered.

However, in the case of using a grindstone, the grindstone itself cannot be centered properly, which results in eccentricity of the roll as the object to be ground, which is not preferable.

In the case of belt grinding, the pressing force is limited to 150 ky or less in order to maintain belt life, so if black crust is formed on the roll surface due to oxidation due to high temperatures during hot rolling, the pressing force should be 150 ky or less. Grinding did not proceed with the pressing force of , and therefore the possibility of practical application was extremely small.

The purpose of the present invention is to eliminate various drawbacks of conventional means and to obtain a roll grinding device that enables 11 grinding of roll assemblies, thereby improving work efficiency.

The main focus of this invention is that the roll surface has particularly high hardness (・
By removing the black skin part by shot blasting and grinding the peeled roll surface with a grinding belt, the roll assembly is made possible by grinding the roll in state 11, and the grinding by the belt is performed. It is characterized by its configuration in which the device is used in combination with a shot device.

The basic configuration of the device of the present invention is, for example, as shown in FIG. The configuration is such that both are overlapped and processed in advance.

As shown in Figure 2, centering on the position of roll R,
- A belt grinding device 2 is provided on one side of the housing 1, for example on the entry side.

Belt grinding device 2, tilt adjustable belt arm 2
This is a known grinding device in which a grinding belt 22 is stretched over a belt arm 1 and pressed against a roll R on the distal end side of the belt arm to carry out grinding.

As shown in FIG. 3, the belt grinding device 2 has a cross-feeding table 24 that is movably held on crossbeams 23 supported by bridges on both left and right sides of the housing 1, and moves the cross-feeding table 24 back and forth. The mechanism 25 enables forward and backward movement in the direction of the roll R, and the transverse beam 23 is guided by a vertical guide plate 26 so as to be able to move up and down.

Therefore, the belt grinding device 2 is provided so that three-way adjustment of XYZ and tilt angle adjustment by the tilting mechanism 27 are possible.

On the other hand, the shot device 3 uses a vacuum plaster that has a function of suctioning and recovering the shot balls, and is adjustable and movable in three directions of XYZ by a holding mechanism that is substantially similar to the grinding device 2. .

In the grinding work process of the device of the present invention, as a pre-treatment for belt grinding, the uncut shot device 3 is operated, and the 5 to 7 k
The black skin part of the roll is peeled off by a pressure shot of g/crl, and when the peeling has progressed to a certain extent, grinding is performed from the opposite side using the belt grinding device 2.

At the time of grinding with the grinding belt, most of the black crust on the roll surface has been removed by the shot device and there are no extremely hardened areas, so the pressing force is less than 150 to 9, which does not exceed the limit of belt life. Desired grinding can be performed by.

FIG. 4 shows a comparison of the grinding situations between belt grinding with shot processing according to the present invention and simple belt grinding without shot processing.

In FIG. 4, the open circle symbol indicates the grinding of the black skin part by the device of the present invention, and the symbol of the open triangle △ indicates the grinding of the normal part by the device of the present invention.

Furthermore, for comparison with these, the symbol with a black circle indicates grinding of a black skin part using only a conventional belt, and the symbol with a black triangle indicates grinding of a normal part with only a conventional belt.

As is clear from Figure 4, it is impossible to grind the black skin using only the conventional belt when the pressing force is less than 150 kg, but with this device, even with a pressing force of less than 150 kg, considerable grinding is possible. It turns out that it is possible.

As described above, according to the roll grinding device of the present invention, the rolling surface of the roll can be corrected by grinding while the roll is installed in the rolling line, so the grinding time can be significantly shortened and the grinding efficiency can be improved. This has the effect of further improving the production efficiency and at the same time reducing the unit consumption of rolls.

Further, since the time required to grind the roll is short, a preheating device is not required even when the roll is reused.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram schematically showing the basic configuration of the device of the present invention, Fig. 2 is a front view of a roll stand attached to the device of the present invention, and Fig. 3 is a view of Fig. 2 from the ■-■ direction. side view,
Figure 4 is a chart comparing the amount of grinding when using this device and when only belt grinding is used. 1: Roll-nosing, 2: Belt grinding device, 3-way yacht device, R: Roll.

Claims (1)

[Scope of utility model registration request] A belt grinding device that is movably attached to a guide plate fixed to a bridge parallel to the roll axis on one side of the roll housing and grinds the rolling surface of the roll from one side, and the installation position of the belt grinding device. and a shot device which is movably attached to the roller and the housing on the opposite side and performs shot blasting from the other side of the rolling surface of the roll, the belt grinding device and the shot device. A grinding device characterized by working together to process the rolling surface of the rolls.