JP3246339B2 - Roll sleeve displacement prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll in which a sleeve is fitted on the outer periphery of a roll shaft, such as a roll for rolling and a rotary die cutter, and a roll sleeve for preventing a gap between the roll shaft and the sleeve. And a shift prevention mechanism.

[0002]

2. Description of the Related Art Many rolls such as rolling rolls and rotary die cutters have a cylindrical steel roll shaft provided with a cylindrical sleeve made of a hard material such as cemented carbide or ceramics on the outer periphery. In order to fix the sleeve to the roll shaft, the sleeve is generally fitted to the roll shaft by shrinkage fitting or cooling fit. This is because, for example, when trying to fix the sleeve to the roll shaft by key fitting, stress concentration occurs particularly in the corner portion of the key groove formed in the sleeve at the time of rolling, etc., and the sleeve made of a hard material having poor toughness This is because there is a possibility that breakage or the like may be caused in the above.

[0003] In addition, the shrinkage allowance in these grilled and chilled shrinks is set to a minimum size suitable for the use conditions of the roll. This is because the thermal expansion coefficient of the hard material such as cemented carbide or ceramics that constitutes the sleeve is smaller than the thermal expansion coefficient of the steel material that constitutes the roll shaft. Is
Since the amount of thermal expansion of the roll shaft exceeds the amount of thermal expansion of the sleeve, if the above-mentioned shrinkage margin is too large, the sleeve may be strongly pressed from the inner peripheral side by the thermal expansion of the roll shaft, and the sleeve may still be broken. Because there is.

[0004]

However, if a set allowance is set under such conditions, the sleeve is in close contact with the roll shaft when the roll is used, and is sufficiently fixed, but the roll is stored and transported. Sometimes the ambient temperature is zero, for example when transporting rolls by aircraft.
° and below, the roll shaft shrinks more than the sleeve due to the difference in thermal expansion coefficient described above,
There is a problem that the sleeve margin is displaced from the roll axis due to the absence of the shrinkage between the two. Here, in order to prevent the roll sleeve from shifting at such a low temperature, for example, as shown in FIG.
In some cases, the knock pins 3, 3 are driven into the outer peripheral surface of the sleeve.
The concentration of stress in the above-described rolling process or the like occurs in the knock pin hole 4 formed in the sleeve 1, and the sleeve 1 is broken.
It often caused trouble.

The present invention has been made in view of such circumstances, and a roll sleeve capable of reliably preventing a sleeve from shifting at a low temperature without causing breakage or the like due to stress concentration on the sleeve. It is an object of the present invention to provide a displacement prevention mechanism.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve such an object, the present invention provides a steel material.
On the outer periphery of the formed cylindrical roll shaft, cemented carbide or
Burn the cylindrical sleeve formed by Lamix
The roll body is fitted with a shrink fit or a cold fit to form a recess in the outer peripheral surface of the roll shaft, and an elastic body that is in close contact with the inner peripheral surface of the sleeve is housed in the concave portion in a compressed state. . Therefore, even if the roll axis largely shrinks at low temperature and there is no squeeze allowance between the sleeve and the sleeve, the elastic body expands and comes into close contact with the inner peripheral surface of the sleeve, thereby preventing the sleeve from shifting. Since the recess for accommodating the elastic body is formed on the tough roll axis side,
Breakage due to concentration of stress can be prevented.

Here, when the sleeve is exposed to a high temperature when the roll is used, such as a hot-rolling roll, the elastic body must be made of a metal material such as spring steel. However, in the case of rolls used under relatively low temperature conditions, such as rolls for cold rolling or die rolls and anvil rolls of a rotary die cutter, this elastic body is sufficiently provided on the inner peripheral surface of the sleeve. The elastic body is desirably formed of an elastic organic material such as urethane or rubber in order to prevent the misalignment by making close contact. In addition, if the recess is formed in an annular shape on the outer peripheral surface of the roll shaft and the elastic material is accommodated over the entire circumference of the annular recess, the elastic body is formed on the inner peripheral surface of the sleeve. By adhering to the entire circumference, it is possible to secure a sufficient contact area between them, and it is possible to more reliably prevent the sleeve from shifting.

[0008]

FIG. 1 to FIG. 3 show an embodiment of the present invention. In the present embodiment, the roll shaft 11 is formed of a steel material and has a substantially columnar shape, and both shaft ends 11A and 11B are supported by bearings (not shown) and are rotatable around the axis O thereof. Also,
The outer peripheral surface 11C of the roll shaft 11 is
A cylindrical sleeve 12 having the same length as the length in the direction of the axis B and the axis O is fitted and fixed by shrink fit or cold fit, and the sleeve 12 is made of a sintered alloy such as a cemented carbide or ceramics. It is formed of such a hard material and has a higher hardness than the roll shaft 11, but has a lower toughness than the roll shaft 11, that is, has a strong tendency to be brittle.

The outer peripheral surface 11C of the roll shaft 11
The groove 13 is formed in a ring shape so as to make a round around the outer peripheral surface 11C around the axis O, and the groove 13 accommodates the elastic body 14 which also forms a ring shape. ing. Here, in the present embodiment, only one groove 13 is formed in the outer peripheral surface 11C of the roll shaft 11 at a position offset to one shaft end 11A side as shown in FIG. On the other hand, the elastic body 14 has an O-ring shape formed of an organic material having elasticity such as urethane or rubber in the present embodiment, and has a non-circular cross section and a circular cross section formed by the cross section. The diameter is set slightly larger than the depth of the concave groove 13.

The elastic member 14 is accommodated in the groove 13 so as to be in close contact with the bottom surface of the groove 13. Therefore, the elastic member 14 is accommodated in the groove 13 as shown in FIG. In a mere state (a state in which the sleeve 12 is not fitted), the outer peripheral portion of the elastic body 14 is projected outward from the outer peripheral surface 11C of the roll shaft 11 by a predetermined amount of projection a. Further, from this state, the sleeve 1
When the elastic member 14 is fitted on the outer peripheral surface 11C of the roll shaft 11, the elastic body 14 is compressed radially inward by an amount corresponding to the protrusion amount a as shown in FIG. 12 is in close contact with the inner peripheral surface. The width of the concave groove 13 is set so that the elastic body 14 does not protrude when the elastic body 14 is crushed and flattened.

However, in a roll provided with a displacement preventing mechanism configured as described above, even when the roll is transported by an aircraft, the temperature in the cargo compartment becomes lower than 0 ° and the difference in the thermal expansion coefficient causes the difference. Even if the squeeze margin between the roll shaft 11 and the sleeve 12 may disappear, the compressed elastic body 14 expands to maintain the state in which the elastic body 14 is in close contact with the sleeve 12. Thereby, it is possible to prevent the sleeve 12 from being shifted from the roll shaft 11. On the other hand, in the above displacement prevention mechanism, the sleeve 1 made of a hard material is used.
2 does not have a conventional dowel pin hole or a concave groove as formed in the roll shaft 11, that is, a portion in the sleeve 12 that causes concentration of stress during normal processing by the roll. Therefore, it is possible to prevent the sleeve 12 from being damaged by such stress concentration. Therefore,
The provision of the above-described displacement prevention mechanism can extend the life of the roll, and can eliminate trouble in processing by the roll and promote stable and smooth processing.

In addition, in the roll sleeve displacement prevention mechanism having the above-described structure, it is possible to avoid the formation of the portion where the stress is concentrated on the sleeve 12 as described above.
The rigidity of the entire sleeve 12 can be improved. For this reason, if the strength of the hard material constituting the sleeve 12 is within the strength limit, the roll shaft 11 formed by shrinkage fitting or cooling fitting is used.
Can be set to a large value, and therefore, it is possible to suppress the reduction itself of the shrinkage due to the temperature decrease in the first place. For example, even if the roll is used in a cold region or the like, the sleeve 12 is displaced. Can be more reliably prevented, while conversely, in use at high temperatures,
Even if the sleeve 12 is pressed from the inner peripheral side by the roll shaft 11 that expands due to the difference in the thermal expansion coefficient, the sleeve 12 can be given a strength that can sufficiently withstand the pressure. That is, by providing the above-described displacement prevention mechanism, it is possible to greatly expand the range of the operating temperature of the roll.

In the present embodiment, the roll shaft 1
The elastic body 14 housed in the concave groove 13 is made of an elastic organic material such as urethane or rubber, and the sleeve 12 is fitted to the outer peripheral surface 11C of the roll 11 as shown in FIG. When the elastic body 14 is compressed and flattened as described above,
A sufficient contact area between the bottom surface of the sleeve 3 and the inner peripheral surface of the sleeve 12 can be secured, and the effect that the displacement of the sleeve 12 can be more reliably prevented can be obtained. Further, the elastic body 14 made of such an organic material is used.
Even when the roll shaft 11 is formed in an annular shape as in the present embodiment, it is easy to extend it so as to expand its diameter toward the outer peripheral side. This is advantageous in that it is easy and the labor is reduced even when the elastic body 14 is compressed when the sleeve 12 is fitted.

However, in this embodiment, the organic material is used as the elastic body 14 as described above.
Only when used under relatively low temperature conditions, such as when the roll is a roll for cold rolling or a roll for a rotary die cutter.For example, in a roll used for hot rolling, the elastic body may be heated to a high temperature. If the elastic body 14 made of an organic material is likely to be exposed to heat, the elastic body 14 is undesirably deteriorated by heat. Therefore, when used for rolls used under such high temperatures,
This elastic body is formed in a C-shape from a highly elastic metal material such as spring steel, and is loosely fitted in the concave groove 13. The sleeve 12 is fitted with the elastic body compressed radially inward. Then, the elastic body may be brought into contact with the inner peripheral surface of the sleeve 12 by its elastic force. In addition,
When the roll is a die roll of a rotary die cutter as described above, a blade die is formed on the outer peripheral surface of the illustrated sleeve 12.

Further, in the above embodiment, the concave groove 13 as the concave portion in this embodiment is formed in the outer peripheral surface 11C of the roll shaft 11 in an annular shape, and the elastic groove formed in the concave portion 13 in the same annular shape. The elastic body 14 is interposed over the entire circumference in the circumferential direction between the roll shaft 11 and the sleeve 12, so that the elastic body 14, the roll shaft 11 and the sleeve The contact area with the sleeve 12 can be further sufficiently ensured, and the displacement of the sleeve 12 can be more reliably prevented. However, in this embodiment, the elastic body 14 is also formed in a ring shape (O-ring shape) as described above, but may be formed in a C-shape when the elastic body is formed of a metal material as described above. Even if an elastic body made of the same organic material is used, for example, a string-shaped elastic body may be wound around the bottom surface of the groove 13 and housed in the groove 13.

Further, in this embodiment, the sleeve 12 is fitted by forming a single annular groove 13 at a position offset to the one shaft end 11A side on the outer peripheral surface 11C of the roll shaft 11. At this time, the elastic body 1 is fitted by fitting the sleeve 12 from the other end 11B side.
4 has the advantage that it can be easily fitted without shifting the position in the axial direction. For example, a pair of concave grooves are formed on both ends 11A and 11B of the outer peripheral surface 11C, and elastic members are formed on both of them. May be accommodated to more reliably prevent the sleeve 12 from being displaced, and more elastic bodies may be provided depending on the length of the roll shaft 11 and the sleeve 12. Further, in addition to forming the recess accommodating the elastic body into the annularly continuous concave groove 13 as described above,
For example, the concave portion discontinuously divided in the circumferential direction is
May be formed on the outer peripheral surface 11C of each of them, and a fragment made of an organic material such as urethane or rubber, a coil spring or a spring piece made of a metal material may be accommodated as an elastic body in each of these. One concave portion may be formed on the surface 11C as the above-mentioned concave portion to accommodate the above-described elastic body.

[0017]

As described above, according to the present invention,
Even if the roll is kept in a low temperature condition during transportation or storage, even if there is no deformation between the roll shaft and the sleeve, the elastic body housed in the recess of the roll shaft will adhere Displacement can be prevented, thereby preventing a portion where stress is concentrated on the sleeve from being formed, and preventing breakage of the sleeve when the roll is used, and the like,
It is possible to reliably hold the sleeve on the roll shaft and promote stable and smooth processing.

[Brief description of the drawings]

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

FIG. 2 shows the embodiment shown in FIG.
FIG. 4 is an enlarged cross-sectional view around the concave groove 13 and the elastic body 14 in a state where is not fitted.

FIG. 3 shows the embodiment shown in FIG.
FIG. 4 is an enlarged cross-sectional view of the vicinity of a concave groove 13 and an elastic body 14 in a state where is fitted.

FIG. 4 is a cross-sectional view of a case in which a sleeve is prevented from shifting using a conventional knock pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Roll shaft 11C Outer peripheral surface of roll shaft 11 12 Sleeve 13 Groove (recess) 14 Elastic body

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16C 13/00 B21B 27/03 B21B 33/02 B23P 11/02 B26F 1/10

Claims (3)

(57) [Claims] 1. A cylindrical sleeve formed of a cemented carbide or ceramic is fitted around the outer periphery of a cylindrical roll shaft formed of a steel material by shrink fitting or cooling shrink. A roll formed on the outer peripheral surface of the roll shaft, wherein an elastic body closely contacting the inner peripheral surface of the sleeve is accommodated in the concave in a compressed state; Sleeve displacement prevention mechanism. 2. The mechanism according to claim 1, wherein the elastic body is made of an organic material having elasticity such as urethane or rubber. 3. The concave portion is formed in an annular shape on the outer peripheral surface of the roll shaft, and the elastic material is accommodated over the entire circumference of the annular concave portion. The roll sleeve displacement prevention mechanism according to claim 1 or 2.