JPH06285517A - Grinding method for roll - Google Patents

Abstract

PURPOSE:To obtain a uniform, fine ground surface in spite of variation of a roll diameter. CONSTITUTION:A cup shape grinding-stone 3 comes into contact with the surface of the roll 1 through its front face. The rotation axis O of the cup shape grinding stone 3 is offset by an offset amount (e) from the axis of the roll 1 and a contact line L is obtained. When the cup shape grinding stone 3 is reciprocated in the axial direction of the roll 1, the roll 1 is ground. The off set amount (e) is adjusted with variation of the diameter of the roll 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of grinding a roll, such as a rolling roll, for grinding the roll surface.

[0002]

2. Description of the Related Art Disk-type grindstones and cup-type grindstones are typical grindstones used in a grinding machine for grinding the surface of a rotating roll such as a rolling roll.

As shown in FIG. 4, the disc type grindstone has an outer peripheral surface serving as a grinding surface, and the grindstone itself is forcibly driven to press the grinding surface in parallel with a roll surface to be ground for grinding. In this case, the rotation speed of the roll 1 is V _R1 (=
V _R2 ), and the rotational speeds of the outer circumference of the grindstone 3 ′ are V _G1 and V _G2 at the outer end a and the inner end b of the grinding surface, respectively, the slip velocities between them are V _S1 = V _S2 . That is, the sliding speed can be increased by increasing the difference between the rotational speeds of the roll 1 and the grindstone 3 '. At this time, the direction of the sliding speed V _S is always orthogonal to the roll surface and is constant in the grinding direction. 3a 'is the axis of the grindstone.

On the other hand, in the cup type grindstone, as shown in FIG. 5, the front surface of the cup type rotating body serves as a grinding surface. Figure 5
FIG. 8 shows a usage example of the cup-shaped grindstone 3 and a situation in which a sliding speed is generated on the ground surface at that time. FIG. 6 is a view of FIG. 5 seen in the direction of the axis 3a of the cup-shaped grindstone 3, in which the axis 0 of the grindstone 3 is aligned with the axis line XX of the roll 1, and the grindstone 3 itself is forced by a separate drive mechanism. It is something that rotates. The contact line L between the roll 1 and the grindstone 3 in this case is as shown in FIG.
The sliding velocity vectors V _S1 and V _S2 at the outer end a and the inner end b of the contact line L coincide with the radial direction with respect to the axis 0, and V _S1 = V _G1 −V _R1 V _S2 = V _G2 −V _R2 V _S1 > V _S2 , and the direction of the slip velocity at each point on the contact line L is always constant and orthogonal to the contact line L, as shown in FIG.

Further, in order to stabilize the grinding performance of the cup-shaped grindstone, the cup-shaped grindstone 3 is provided with its axis 3a and roll 1.
Has proposed a grinding method in which the axis line X-X is offset by a predetermined amount to provide an offset (Japanese Patent Application No. 61-15470).
6).

9 and 10 show the grindstone 3 and the roll 1 at this time.
3 shows a state of a contact line L with and a slip velocity distribution generated on the contact line L. As shown in the figure, the contact line L is generated at a position deviating from the radial direction toward the axis 0 of the grindstone 3, and the slip velocity vectors V _S1 and V _S2 at the outer end a and the inner end b thereof are V _S1 > V _S2 And the absolute values thereof are the rotation speeds V _R1 and V _R2 of the roll 1.
Is constant, it can be freely set by the rotational speeds V _G1 and V _{G2 of} the grindstone 3. Also, the slip speeds V _S1 and V _S2
The direction of is slightly different at each point on the contact line L. Therefore, the grinding surface of the roll 1 has a stable grinding performance due to the cross-grinding action (a phenomenon in which the grinds intersect).

[0007]

As described above, in the conventional grinding method, the method of forcibly driving and using the disc type grindstone and the cup type grindstone with its axis aligned with the roll axis are forced to grind the grindstone itself. In any of the driving methods, the sliding speed at the contact line can be increased to improve the grinding efficiency, but the grinding direction is always in the direction orthogonal to the roll axis, and the grinding line is always in a fixed direction. If it is rough, and if it is used for a long time, biting of the abrasive grains on the grinding surface is suppressed and the grindstone's sharpness deteriorates, as a result, the grinding performance gradually decreases, and the grindstone is not regenerated by self-action and stable grinding is performed. Will not be able to continue.

A cup type grindstone with an offset is devised as a method for solving this problem. This is because the grinding direction always crosses due to the cross-grinding action, so that clogging does not occur and stable grinding can be continued. However, since the offset amount is constant in this method, the contact state between the grindstone and the roll changes when the diameter of the roll to be ground changes, and the grinding depth differs in the radial direction of the grindstone, so uniform and highly accurate grinding is possible. There was a problem that I could not get a face. In particular, in the case of a long grinding stone such as diamond or CBN, that is, a hard grinding stone, the problem of one-sided contact becomes conspicuous, so that it cannot be used.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to install a cup-shaped grindstone by offsetting the rotation axis of the cup-shaped grindstone from the axis of the roll by a predetermined amount. While pressing the mold grindstone or forcibly driving the front surface against the roll, and, in the grinding method of the roll so as to grind the roll while reciprocating the cup grindstone in the axial direction of the roll, The feature is that the offset amount of the cup-shaped grindstone is increased or decreased in proportion to the size of the diameter.

[0010]

[Function] The cup-shaped grindstone is installed so that it does not intersect the axis of the roll to be ground (offset), and the grindstone is not driven or is forcedly driven, and the front surface of the cup-shaped grindstone becomes the roll surface. Since the grinding is performed by pressing and reciprocating in the roll axis direction, the contact line between the grindstone and the roll is slightly displaced from the direction toward the grindstone axis, and the sliding speed direction is at each point on the contact line. It's a little different. At this time, the rotation speed of the grindstone is appropriately changed according to the material of the roll to properly adjust the sliding speed, and the offset amount is appropriately adjusted according to the diameter of the roll to be ground, so that the diameter of the roll is different. However, the contact state between the roll and the grindstone is substantially uniform in the radial direction of the grindstone, so that uniform and highly accurate grinding can be performed.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> A first embodiment of the present invention will be described with reference to the drawings. The present invention relates to an improvement in a grinding method using a cup-shaped grindstone, and as shown in FIG. 1, the cup-shaped grindstone 3 is offset so that the axis line XX of the roll 1 to be ground and its axis 0 do not intersect. Install by shifting the amount e,
The front surface is pressed against the surface of the roll 1 (see FIG. 5), and is reciprocally moved in the direction of the axis XX of the roll 1 for grinding. In the case of this embodiment, the cup-shaped grindstone 3 is not driven from the outside by a motor or the like, but contacts the roll 1 and rotates.

When the cup-shaped grindstone 3 is ground in such a manner that it is offset from the axis of the roll 1, the cross-sectional shape of the cup-shaped grindstone 3 after abrasion varies depending on the roll diameter of the roll 1 to be ground.

2 (a), (b) and (c) show an outer diameter of 220 mm.
φ, the inner diameter of 120mmφ whetstone 3 is used, roll diameter 870
Fig. 2 (a) shows an analysis example of the wear amount distribution generated in the grindstone 3 when the roll 1 of mmφ, 820mmφ, and 770mmφ is grinded and the optimum offset amount according to the roll diameter.
Is the radial direction of the thickness of the grindstone 3 in each case (the cross-sectional shape after abrasion), FIG. 2B is the radial distribution of the difference Δδ in the thickness of the grindstone 3 in each case, and FIG. Shows the optimum offset amount in each case with the roll diameter of 820 mmφ as a reference.

From FIGS. 2A, 2B and 2C, it can be seen that when the roll diameter of the roll 1 to be ground changes, the radial distribution of the cross-sectional shape of the grindstone 3 after grinding also differs. This means that the grinding wheel 3 can be used with roll diameters of 870 mmφ, 820 mmφ and 770 mmφ.
Means that there is a difference in the contact state between the roll 1 and the roll 1. Therefore, for example, after grinding a roll of 820 mmφ and then grinding rolls of 870 mmφ and 770 mmφ, only part of the grindstone 3 comes into contact with the roll 1. It becomes impossible to perform uniform grinding. In this case, a relatively soft grindstone (a soft grindstone has a short life) is likely to follow the diameter of each roll, or a grindstone with a long grindstone life, that is, a hard grindstone causes a problem.

In the present invention, when the roll diameter of the roll to be ground changes as described above, the wear amount of the grindstone 3 can be changed by appropriately changing the offset amount e (see FIG. 1) of the grindstone with respect to the roll axis. That is, the change in the cross-sectional shape of the grindstone 3 is minimized.
An example of analysis when the offset amount e is changed for rolls of 70 mmφ and 770 mmφ is shown.

That is, the difference in the change in the wear depth Δδ of the grindstone was remarkable as compared with the roll having the same offset amount e = 65 mm and the roll diameter of 820 mmφ, but in the case of the roll diameter of 870 mmφ, e = 65 mm to e = 66 mm And roll diameter 770mmφ
In the case of, by changing from e = 65 mm to 64 mm, as shown by the dotted line and the one-dot chain line, the difference is close to almost zero with the roll diameter of 820 mmφ.

As described above, when the roll diameter changes, the offset amount is changed according to the roll diameter and the change amount of the roll diameter and set to an appropriate value, so that the contact state can be always maintained in the same state. Therefore, uniform grinding becomes possible.

FIG. 2C shows an example of analysis of the optimum offset amount e according to the roll diameter. That is, when the roll diameter is 820 mmφ and the offset amount is e = 65 mm, the optimum offset amount e is e = 64 mm when the roll diameter is 770 mmφ and e = 66 mm when the roll diameter is 870 mmφ, which is proportional to the roll diameter. And offset amount e
By adjusting, the contact state of the grindstone can always be maintained in the same state.

In FIG. 2, α is the inclination angle of the axis 3a of the grindstone 3 with respect to the normal direction of the surface of the roll 1 (see FIG. 5).

<Second Embodiment> A second embodiment of the present invention will be described with reference to the drawings. The present invention relates to an improvement of a grinding method using a cup-shaped grindstone, and as shown in FIG. 1, the cup-shaped grindstone 3 is arranged so that the axis XX of the roll 1 to be ground and its axis 0 do not intersect. It is installed by offsetting the offset amount e, and the whetstone 3 is forcibly driven by a driving device (not shown), and its front surface is pressed against the surface of the roll 1 (see FIG. 5).
The roll 1 is reciprocated in the direction of the axis X-X to grind.

9 and 10 show the grindstone 3 and the roll 1 at this time.
The contact line L and the slip velocity distribution generated on the contact line L are shown. The contact line L is generated at a position deviated from the radial direction toward the axis 0 of the grindstone 3 as shown in the figure. , The sliding velocity vectors V _S1 and V _S2 at its outer end a and inner end b
Is V _S1 > V _S2 , and the absolute value thereof is the rotation speeds V _R1 and V _{R2 of the} roll 1.
Can be freely selected depending on the rotation speeds V _G1 and V _{G2 of} the grindstone 3. Also, the slip speeds V _S1 and V _S2
The direction of is slightly different at each point on the contact line L.

Therefore, the ground surface of the roll 1 is finely and uniformly finished by the cross-grinding action (a phenomenon in which the grinding lines intersect), and the grinding effect is also improved. Further, the grinding efficiency can be further improved by increasing the rotation speed of the grindstone 3 and increasing the relative sliding speed.

By the way, when the cup-shaped grindstone 3 is ground with the axis line of the roll 1 being offset as described above, the cross-sectional shape of the cup-shaped grindstone 3 after wear depends on the roll diameter of the roll 1 to be ground. Different. Figure 3 (a),
FIG. 3B shows an example of analysis of the wear amount distribution generated in the grindstone 3 when the grindstone 3 having an inner diameter of 120 mmφ and an outer diameter of 220 mmφ is used and a roll 1 having a roll diameter of 820 mmφ and 770 mmφ is ground. FIG. 3A shows the radial distribution of the thickness of the grindstone 3 in each case (cross-sectional shape after abrasion), and FIG. 3B shows the radial distribution of the difference Δδ in the thickness of the grindstone 3 in each case with a roll diameter of 820 mmφ. The case is shown as a reference.

From FIGS. 3 (a) and 3 (b), it can be seen that when the roll diameter of the roll to be ground 1 changes, the radial distribution of the cross-sectional shape of the grindstone 3 after grinding also differs. This means that there is a difference in the contact state between the grindstone 3 and the roll 1 depending on the roll diameter of 820 mmφ and 770 mmφ. Therefore, for example, after grinding a roll of 820 mmφ, and then grinding a roll of 770 mmφ, Only part of the grindstone 3 comes into contact with the roll 1 and uniform grinding cannot be performed. In this case, a relatively soft grindstone (a soft grindstone has a short life) is likely to follow the diameter of each roll, but a grindstone with a long grindstone life, that is, a hard grindstone causes a problem.

According to the present invention, when the roll diameter of the roll to be ground changes as described above, the wear amount of the grindstone, that is, the wear depth of the grindstone, that is, the offset amount e (see FIG. 1) of the grindstone with respect to the roll axis is appropriately changed. The diameter of the roll 3 is shown in FIG.
An example of analysis when the offset amount e is changed for a roll of 0 mmφ is shown.

That is, compared with a roll having the same offset amount e = 65 mm and a roll diameter of 820 mmφ, the wear depth of the grindstone Δδ
The difference in the change of was remarkable, but from e = 65 mm to e = 6
By changing to 4 mm, as shown by the dotted line, the difference between the roll diameter of 820 mmφ and the difference is almost close to zero.

In this way, when the roll diameter changes, the offset amount is changed according to the roll diameter and the change amount of the roll diameter and set to an appropriate value, so that the contact state can always be maintained in the same state. Therefore, uniform grinding becomes possible. In FIG. 3, α is the inclination angle of the axis 3a of the grindstone 3 with respect to the normal direction of the surface of the roll 1 (see FIG. 5).

[0029]

As described above in detail, in the method for grinding a roll of the present invention, the cup-shaped grindstone is installed with a slight offset (offset) so that its axis does not intersect the axis of the roll to be ground. The grinding wheel is not driven or is forcibly driven so that the front surface is pressed against the roll surface, and grinding is performed while reciprocating in the roll axis direction. The position is slightly displaced from the facing direction, and the directions of the sliding speeds of the two are slightly different at each point on the contact line, so that a fine ground surface can be obtained.

At this time, since the number of revolutions of the grindstone is changed according to the material of the roll and grinding is performed at an appropriate sliding speed, the grinding efficiency is improved and the life of the grindstone is extended.

Further, since the offset amount is appropriately adjusted according to the roll diameter of the roll to be ground, even if the roll diameter changes, the contact state between the grindstone and the roll becomes substantially uniform in the radial direction of the grindstone. It is possible to always obtain a uniform and precise ground surface, and to improve the grinding accuracy.

Moreover, since a hard grindstone such as diamond or CBN which is hard to wear can be used, there is an effect that the life of the grindstone is significantly extended.

[Brief description of drawings]

FIG. 1 is a state diagram showing an arrangement state of a roll and a grindstone according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing each characteristic in the first embodiment.

FIG. 3 is a characteristic diagram showing each characteristic in the second embodiment.

FIG. 4 is a state diagram showing a grinding state by a disc type grindstone.

FIG. 5 is a state diagram showing a conventional grinding state with a cup-type grindstone.

FIG. 6 is a state diagram showing a conventional grinding state with a cup-type grindstone.

FIG. 7 is an explanatory diagram showing a contact line between a roll and a grindstone and a slip velocity vector.

FIG. 8 is an explanatory diagram showing a contact line and a slip velocity distribution.

FIG. 9 is an explanatory diagram showing a contact line and a slip velocity distribution when an offset is provided.

FIG. 10 is an explanatory diagram showing a contact line and a slip velocity vector when an offset is provided.

[Explanation of symbols]

1 roll 3 cup type grindstone 3a cup type grindstone axis L contact line between grindstone and roll V _R1 , V _R2 Roll speed V _G1 , V _G2 Wheel speed V _S1 , V _S2 Relative sliding speed

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Egawa 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Inventor Yukio Hisa, 4th Kannon Shinmachi, Nishi-ku, Hiroshima 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (3)

[Claims] 1. A cup-shaped grindstone is installed by offsetting a rotating shaft of the cup-shaped grindstone from a roll axis by a predetermined amount, and the front surface of the cup-shaped grindstone is pressed against the roll, and the cup-shaped grindstone is mounted on the roll shaft. A roll grinding method in which a roll is ground while reciprocating in a direction, wherein the amount of offset of the cup-shaped grindstone is increased or decreased in proportion to the size of the roll diameter. 2. A cup-shaped grindstone is installed by offsetting the rotary shaft of the cup-shaped grindstone from the axis of the roll by a predetermined amount, and the front surface of the cup-shaped grindstone is pressed against the roll while being forcibly driven, and the cup-shaped grindstone is also used. In a roll grinding method in which a grindstone is reciprocally moved in the axial direction of the roll to grind the roll, the amount of offsetting the cup-shaped grindstone is increased or decreased in proportion to the size of the roll diameter. Roll grinding method. 3. A cup-type grindstone is installed by offsetting the rotary shaft of the cup-type grindstone from the axis of the roll by a predetermined amount, and the front surface of the cup-type grindstone is pressed against the roll while being forcibly driven, and the cup-type grindstone is also used. In a roll grinding method in which a grindstone is reciprocally moved in the axial direction of the roll so as to grind the roll, the number of revolutions of the cup-shaped grindstone is increased or decreased in proportion to the size of the roll diameter. Grinding method.