JPS5948689B2 - Online roll grinding method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an online roll grinding method and apparatus.

This invention relates to improvements in a method and device for grinding a rolling roll with a grinding object such as a grindstone while rotating the rolling roll while the rolling roll is assembled in a rolling mill stand. The aim is to make it possible to perform roll grinding that ensures the following.

Regarding roll grinding in a conventional rolling mill stand, as is known from Japanese Patent Application Laid-Open No. 52-87156 and Japanese Patent Application Laid-Open No. 52-146361, such a roll grinding device is equipped with a support on a housing post or the like of the main body of a rolling mill. The grinding tool stand is installed astride these so that it can move parallel to the roll axis, and the grinding tool stand can be pressed and fed against the roll surface. Designed.

However, such a roll grinding device has the following drawbacks.

Generally, rolling rolls are supported by a roll bearing box and incorporated into a rolling mill stand, and therefore the rolling mill housing body and the roll bearing box are not completely integrated; in other words, there is a space between the roll bearing box and the housing window. There is a gap required when changing rolls, and this value is usually between 0.5 and 2.
It is 1.8 mm.

The roll bearing itself also has some clearance. Because of the mechanical design tolerances between the rolling mill body and the rolls, the conventional grinding equipment described above cannot perform grinding completely parallel to the roll axis.
Therefore, roundness and cylindricity cannot be obtained. In other words, in the case of the grindstone pressing method, as a result of grinding as the roll rotates,
Perfect circular grinding is not possible due to the eccentricity of the roll and the gap between the roll bearing box and the housing.

Similarly, the same problem occurs with the grindstone feeding method, but this method in particular has the disadvantage that it cannot ensure cylindricity in addition to roundness. It is technically difficult to make the gap between the roll bearing box and the housing window perfectly match the working and drive sides and parallel to the grinding equipment, and attempting to do so will result in significant maintenance costs. This is because it will go up. Further, the known roll grinding apparatus as described above has the effect of simply grinding the worn portion of the roll and extending the usage period of the roll, and cannot obtain a desired roll profile.

The present invention provides an online roll grinding method that has been devised to improve these drawbacks, and a grinding device that can be used directly to carry out the method.

FIG. 1 is a plan view illustrating a principal part of a roll grinding device installed in a rolling mill stand according to the present invention, and FIG. 2 is a sectional view taken along the Y-Y line in FIG. 1. In the figure, 1 is a rolling roll, 2 is a housing post, 3 is a roll bearing box,
4 is a guide groove attached to the housing post 2, 5 is a guide frame, 6 is a grinding table frame, 7 is a cross-feed bed, 8 is a grinding table 9 is a grindstone, 10 is a motor, IIA, I
IB is a pair of left and right roller wheels, 12A and 12B are a pressing device consisting of a pair of fluid cylinders attached to the guide frame 5 and connected to the grinding table frame 6, and 13 is the guide frame 5.
and the grinding table frame 6, 14 is a pedestal that supports the grinding table frame 6, and 15 is a roller wheel IIA, I.
Grinding table frame 6 with bifurcated bracket supporting IB
It is installed on. 16 is between the guide surfaces of the roller wheels IIA and IIB which are undercut on the roll 1, 17,
Reference numeral 18 denotes a pressure contact mechanism for pressing the grinding table 8 against the roll surface and a vertical feeding bed. Note that '' indicates the roll body diameter.

As shown in FIG. 2, a pair of left and right pedestals 14 are mounted on the guide frame 5, and a grinding table frame 6 is mounted astride these pedestals 14. Fluid cylinders 12A, 12 attached to the guide frame 5
B allows it to move forward and backward separately on the left and right sides. Further, the grinding table frame 6 faces the loam 1 and has a roller wheel 11 mounted thereon via a bifurcated bracket 15. be.

A cross-feed bed 7 is mounted on the grinding table frame 6, and a vertical feed bed 18 is mounted on top of the cross-feed bed 7 so as to move horizontally on the cross-feed bed 7 together with the grinding table 8. It's getting old.

．． In the figure, 19 is a feed screw for traversing. Grinding table bed 18
A grinding table 8 is placed on top of the grinding table 8, and the grinding table 8 can be moved back and forth by a fluid cylinder 17 on the grinding table bed 18, thereby setting the necessary cutting depth of the grindstone 9.

1 and 2 illustrate an embodiment of the present invention, after the rolling roll 1 is assembled into a rolling mill stand, the rolling roll 1 is moved while sliding the guide frame 5 in the guide groove 4. The roller 1 is loaded by a moving device (not shown) toward the roller 1, and then fixed to the guide groove 4 by bolts while maintaining a state substantially parallel to the axis of the roll 1.

Next, the grinding table frame 6 has cylinders 12A and 12B.
towards the surface of roll 1, and the roller wheels IIA, I
When the IB is advanced until it comes into contact with the guide surface 16 machined on the surface of the roll 1, in this state the direction of lateral movement of the guide bed 7 and thus the grinding table 8 becomes parallel to the axial direction of the roll 1. The error in parallelism at this time is the roller wheels IIA, II
Only the play at B and the gap between the guide bed 7 and the grinding table 8 are left. If a self-aligning type bearing is used for the roller wheel 11, there will only be a play of about 20 to 40 μ, which is the fitting gap of the bearing, and the gap between the guide bed 7 and the grinding table 8 will be about 30 to 50 μ. Therefore, the total difference is within 100μ under the worst conditions. On the other hand, even if the roll axis of the roll 1 is misaligned with the housing window due to the roll bearing box 3 or the like, the grinding table frame 6 will rotate around the cylinders 12A and 12 with the pin 13 as a fulcrum.
Since it is constantly pressed against the surface of the roll 1 at B, parallelism can be easily maintained. That is, the lateral movement direction of the grinding table 8 can be made parallel to the axis of the roll 1. Roller cars IIA and IIB have guide surface 1.
6 serves to ensure the above-mentioned parallel relationship to the roll 1.

It is preferable that the guide surface 16 is finished to have a smaller diameter than the body diameter D,゛ of the roll 1 when the roll 1 is ground in advance, and the width of this guide surface 16 is smaller than the end of the body length of the roll. It only needs to be about 50 mm, and even if this width is used, there is no problem at all in the rolling operation. Since this guide surface 16 serves as a reference surface for grinding operations, it is preferable to apply oil to it to prevent rust and corrosion.

Although the mechanism for making the body diameter variation of the roll 1 follow the variation in the roll position is not shown or explained in detail, it can be almost satisfied by making the bifurcated bracket 15 a pin joint, but if there is a large variation, In this case, a mechanism for adjusting the level of the grinding table 8 may be added and adjusted separately.

As described above, this invention performs grinding based on the surface itself of the roll 1, so that conventional equipment cannot perform satisfactory grinding due to the effects of roll eccentricity and rolling mill play. This is an excellent device that has been improved from what was previously missing, and can function as a conventional offline curl grinder.

Although this embodiment shows an example in which the guide frame is attached to the guide groove of the housing L post, it is also possible to attach it to other known stands.

The effects of this invention are summarized as follows. 1. Rolls can be ground while maintaining highly accurate roundness and cylindricity.

Therefore, any roll pro 1 pool can be obtained, and especially with conventional roll grinding equipment, it is not possible to set the grinding allowance in advance, and the only way to do this is to adjust the pressing force of the grinding wheel. It was an indirect thing.
In addition, even with the method of feeding the grindstone, it is not possible to ensure parallelism between the reel surface and the grindstone, so even if the grinding allowance is given in advance, it becomes large, and the roll profile and roll consumption rate worsen. It is. With the method of the present invention, the grinding accuracy is within 100μ, which is inferior to the accuracy within 50μ of existing offline roll grinders, but it can be said to be the best as an online method.

Since the wear of the rolling roll is usually about 300 μm to 1.1 mm, the accuracy is sufficient. In the description of the embodiment, only parallel grinding is described, but by adding a mechanism for providing a crown to the grinding table 8, it is possible to grind not only a flat roll but also any roll profile such as a curved roll or a trapezoidal roll. .

2. As an applied function, the fluid cylinder 1 shown in Fig.
By adjusting the pressures of 2A and 12B, it is possible to adjust the cross roll (misalignment between the roll axis and the mill housing core), and it is possible to prevent the camber of the rolled plate.

In other words, the conventional method for modifying a camber is to move the drive-side bearing box and the drive-side bearing box using a reduction screw, create a difference in roll gap, give a deviation in plate thickness, and adjust the plate by balancing the force in the thrust direction. It is now possible to eliminate the inconvenience of keeping the plate straight, and it can be used to improve the shape and thickness accuracy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the roll grinding device, and FIG. 2 is a side view of the roll grinding device. 1...Rolling roll, 2...Housing post, 5...Guide frame, 6...
...Grinding table frame, 7...Transverse feed rivet, 1
1A, 11B... Coro car, 12A, 12B...
... Pressing device, 16 ... Guide surface.

Claims (1)

[Scope of Claims] 1. When performing grinding correction on a rolling roll in a rolling mill stand, a grinding wheel is set with reference to a guide surface consisting of a cylindrical machined surface previously formed in non-rolling areas at both ends of the rolling roll. An online roll grinding method characterized by keeping the lateral movement of a grinding table that supports the grinding table parallel to the axis of the rolling roll. 2. A guide frame fixed into the rolling mill stand with its longitudinal direction oriented in the same direction as the axis of the rolling roll, a grinding table frame that faces the rolling roll and can move forward and backward on this guide frame, and this grinding table frame. The direction of movement of the grinding table along the cross-feeding bed on the grinding table frame is aligned with the axis of the rolling roll by roller wheels that are in rolling contact with guide surfaces made of cylindrical surfaces formed in advance on both ends of the rolling roll. An online roll grinding device consisting of a pressing device that is held and fixed in parallel positions.