JPH0428466B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a split sleeve mounting structure for a composite roll in which a split sleeve is inserted around the outer periphery of an arbor and connected by means such as shrink fitting or loose fitting. .

Prior Art A roll that is basically composed of a cylindrical part and a neck that supports the cylindrical part at both ends can be used as a single roll in which the cylindrical part and the neck are integrally formed, depending on the application. , and so-called composite rolls, which are made by inserting a sleeve around the outer periphery of an arbor. This composite roll is suitably used, for example, as a pinch roll for pinch-pulling hot slab slabs in continuous casting installations, or as a roll for hot conveyance of slabs. Specifically, in the continuous casting installation shown in FIG. 1, the core injected from the tundish 10 into the mold 12 hangs down as a slab slab 14 with only the outer jacket solidified, and this high-temperature slab slab 14 , a series of support rolls 16, guide rolls 18, and pinch rolls 20 cooperate to ensure stable delivery.

Since the surface temperature of these rolls rises to about 600 to 850°C when they come into contact with the hot slab slab 14, conventionally, as shown in FIG. A single sleeve 24 made of heat-resistant alloy such as martensitic stainless steel or chromium-molybdenum steel.
Composite rolls are used that extrapolate and perform connections such as shrink fitting. Note that in this composite roll, the surface of the sleeve 24 expands when exposed to high temperatures;
Cooling water flows through the arbor 22 through a hole 26 drilled in its center, so the temperature does not rise much, so a temperature difference occurs between the two, and the sleeve 24, which has a large thermal expansion, is tightened against the arbor 22. A situation occurs where the power decreases. For this reason, in the circular portion A shown by the broken line in FIG. 2, one end of the sleeve 24 is welded 28 to the arbor 22, and fixed with a pin 30 or other screw 3.
2, and the other end of the sleeve 24 is left free so that the sleeve 24 can expand and contract in the longitudinal direction.

In this way, conventional composite rolls are designed to allow the sleeve to expand and contract in the longitudinal direction with respect to the arbor, but in reality, the sleeve 24
As mentioned above, the guide rolls come into contact with the hot continuously cast slab and are exposed to high temperatures, and the guide roll group is forced to be rapidly cooled by cooling water spray, resulting in rapid temperature fluctuations. Moreover, the expansion and contraction of the sleeve 24 with respect to the arbor 22 is not necessarily uniform over the entire length thereof, resulting in problems such as swelling of the sleeve in the center and heat cracks. . In particular, in the pinch roll group, in order to make the thickness of the slab slab uniform, the roll spacing is finely adjusted and the rolling force is adjusted to be optimal. It is clear that this has a negative effect on the quality of the slab itself.

Furthermore, in addition to being used in locations that are affected by high temperature heat, such as the continuous casting equipment, long composite rolls may be used in harsh working environments. In this case, if the sleeve does not wear uniformly and wears out unevenly, it is extremely uneconomical to replace the entire long sleeve each time, so it would be convenient if only the worn part could be repaired.

Therefore, as a response to such a configuration,
For example, Utility Model Publication No. 48-34893, JP-A-55-88919,
Japanese Utility Model Application No. 57-132758 and Japanese Patent Application Publication No. 58-6719 propose a composite roll in which a plurality of split sleeves or rings are placed around the outer periphery of a roll shaft. At this time, the composite roll is used as the pinch roll for pulling out the slab slab as described above,
Even when exposed to high-temperature thermal stress, each sleeve can move appropriately in the axial direction, so that the sleeve does not bulge in the center or cause heat cracks. Furthermore, even when used in harsh working environments, there is no need to replace the entire sleeve, and only the worn-out divided sleeves need be replaced and repaired, which is economical.

Problems to be Solved by the Invention It is clear that a composite roll consisting of split sleeves in itself has significant advantages over rolls of the type in which a single sleeve is extrapolated onto an arbor, as described above. It is. However, the structure for attaching each divided sleeve is that, as is common to all of the above-mentioned prior arts, the end edges of adjacent sleeves are formed in a wavy, diagonal, or other step shape, and these are engaged with each other. It is limited to those in the form of Thus, on individual sleeves, wavy,
Forming an interlocking part in a diagonal shape or a step shape, and also forming an interlocking part in an adjacent sleeve with a shape corresponding to the above-mentioned interlocking part is extremely complicated in terms of the manufacturing process, and requires high precision. Therefore, the number of steps increases and the manufacturing cost also increases.

Purpose of the Invention The present invention has been proposed in order to suitably solve the problem in view of the problems inherent in the composite roll having split sleeves according to the prior art described above. The purpose is to provide a structure that can be easily installed.

Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the present invention comprises an arbor and a plurality of split sleeves that are fitted onto the arbor and aligned in the axial direction, each of which has a In the split sleeve mounting structure for a composite roll, in which the split sleeves have a predetermined expansion margin between adjacent sleeves, the split sleeve located at least in the middle of the group of sleeves aligned in the axial direction has a predetermined expansion margin between adjacent sleeves. A plurality of keyways are drilled at required intervals on the circumferential edge of the other circumferential edge, and a plurality of keyways are bored correspondingly at a required phase angle with respect to the keyway on the other circumferential edge. , by allowing each keyway of the split sleeve to face a key fixed to the circumferential surface of the arbor 38,
The keyway is attached to the arbor so as not to be rotatable in the circumferential direction, and the keyway has a required play in the sleeve axial direction relative to each corresponding keyway, so that the split sleeve can slide in the longitudinal direction with respect to the arbor. It is characterized by allowing

Embodiments Next, a structure for attaching a split sleeve of a composite roll according to the present invention will be described below with reference to preferred embodiments and the accompanying drawings. FIG. 4 is a partially cutaway side view showing an embodiment of the composite roll 34 according to the present invention, and FIG. 5 is a perspective view of the composite roll shown in FIG. 4. The illustrated composite roll 34 basically consists of an arbor 38 having a through hole 36 for cooling water to flow through in the central axis direction, and a plurality of divided sleeves 40a to 40n inserted around the outer periphery of the arbor 38. ing. That is, the sleeve
In the case of the figure, the sleeve is divided into three segments: a first sleeve 40a, a second sleeve 40b located in the middle, and a third sleeve 40c. g is formed.

The dimension of this expansion allowance g is determined by the thermal expansion coefficient specific to the sleeve 40, the rising temperature limit, etc.
The optimum value is specifically determined in consideration of the temperature expansion difference between the arbor 38 and the arbor 38. In addition, the material of each sleeve is appropriate depending on the working environment in which the roll is used. When used in the continuous casting equipment mentioned above, heat-resistant alloys such as martensitic stainless steel or chromium-molybdenum steel are used. is considered to be a suitable material.

Further, each of the plurality of sleeves 40a to 40c is arranged so that each of the sleeves 40a to 40c is slidable in both longitudinal directions of the arbor 38 and cannot be rotated in the circumferential direction.
8 with a combination of a key groove and a key, which will be described later. In this case, "the divided sleeve 40 as each segment is slidable in both longitudinal directions of the arbor 38" means that the divided sleeve 40 is slidable in both longitudinal directions of the arbor 38.
This refers to the fact that when the sleeve increases in temperature and thermally expands, the sleeve can expand in a direction that narrows the expansion margin g along both longitudinal directions of the arbor 38, and the split sleeve 40 expands in both directions with respect to the arbor 38. This does not mean that they are loosely fitted so that they can always slide freely in the longitudinal direction.

As a means for stably connecting each divided sleeve 40 to the arbor 38, this embodiment uses a key connection using a key 42 fixed to the arbor 38 and a keyway 44 provided at the end of each sleeve. . For example, in FIGS. 4 and 5, two keyways 44a are bored at 180° intervals in one circumferential edge of the split sleeve 40a, and the key grooves 44a are bored in the other circumferential edge. Two keyways 44 are also spaced apart by 180° with a phase angle of 90° with respect to the groove 44a.
b is drilled.

After inserting this sleeve 40a around the outer periphery of the arbor 38, keys 42a and 42b are inserted into the arbor 38 at corresponding locations in each keyway 44a and 44b.
By fixing the split sleeve 40a to the arbor 38 by bolting or other means such as welding, the split sleeve 40a can be attached to the arbor 38 so that it cannot rotate in the circumferential direction. In this case, the keyway 44
a, 44b have a required play in the sleeve axial direction with respect to the corresponding keys 42a, 42b, thus allowing the split sleeve 40 to slide in both longitudinal directions relative to the arbor 38. There is. Further, the other divided sleeves 40b and 40c are also keyed together by the same means. Note that key 4
As shown in FIGS. 6a to 6c, it is preferable that the shape of 2 is appropriately selected from circular, elliptical, polygonal, etc. to avoid concentration of stress in specific locations.

In this way, the key grooves 44 and the corresponding keys 42 bored at both circumferential edges of the split sleeve 40
It is preferable to sequentially arrange them in a staggered manner with a predetermined phase angle, and examples thereof are shown in FIGS. 7a to 7c.

That is, FIG. 7a shows that the keyways 44a and 44b are
This shows an example of a staggered arrangement with a phase angle of 90°, and is also shown in FIGS. 4 and 5 described above. Further, in FIG. 7b, three keyways 44a are bored at 120° intervals on the circumferential edge of one sleeve, while the other sleeve has a phase angle of 60°. Similarly, three keyways 44b are shown at 120° intervals. Further, FIG. 7c shows a state in which four keyways 44a are drilled at 90° intervals, and four keyways 44b are similarly drilled at 90° intervals with a phase angle of 45°. It shows. As shown in FIG. 4, the top of the key 42 is of course set to be located below the surface level of the split sleeve 40.

Further, in the embodiment shown in FIG. 4, all of the three divided sleeves 40a to 40c are keyed together and are configured to be slidable relative to the arbor 38 in both longitudinal directions. However, in the present invention, it is not a requirement that all the divided sleeves be able to slide in both longitudinal directions of the arbor, but only the sleeve located at least in the middle among the plurality of sleeves can slide in both longitudinal directions of the arbor. It suffices if it is attached with a key so that it can be rotated in the circumferential direction. For example, as shown in FIG. 8, one circumferential edge of the split sleeves 40a and 40c located near each end of the arbor 38 is fixed to the arbor 38 by welding 46, and the split sleeve located in the middle is fixed to the arbor 38 by welding 46. It goes without saying that only 40b may be keyed and attached so as to be slidable in both longitudinal directions.

Furthermore, if the sleeve 40 is thick, the keyway 44 formed in the circumferential edge of the sleeve may not be a cutout groove but may be a bottomed groove, as shown in FIG. In this case, the keyway 44 is connected to the sleeve 40.
Since it is not exposed as a notched groove on the outer periphery, if it is used in a nipping roll etc. in continuous casting equipment,
This is suitable because it does not leave groove marks on the surface of the slab slab.

Effects of the Invention As explained above, the split sleeve mounting structure according to the present invention has a plurality of keyways bored at required intervals on one circumferential edge of the split sleeve located at least in the middle of the sleeve group, and , forming a plurality of corresponding keyways at a required phase angle in the other circumferential edge, and inserting the sleeve into the arbor;
A key is made to face each of the key grooves, and the key is fixed to the arbor. Therefore, compared to the conventional method, the manufacturing process is significantly reduced, and high precision is not required, making it possible to keep manufacturing costs low.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a roll group in a continuous casting facility, FIG. 2 is a longitudinal cross-sectional view of a composite roll according to the prior art, and FIGS. 3 a to d are circular portions A shown in broken lines in FIG. FIG. 4 is a partially cutaway side view of an embodiment of the split sleeve mounting structure according to the present invention, FIG. 5 is a perspective view of the composite roll shown in FIG. 4, and FIGS. 7c is an explanatory diagram showing the cross-sectional shape of the key, FIGS. 7a to 7c are explanatory diagrams of key grooves arranged in a staggered manner, FIG. FIG. 2 is a perspective view showing another embodiment of the key connection when connecting a thick sleeve to an arbor. 38... Arbor, 40... Sleeve, 42...
...key, 44...keyway, g...expansion allowance.

Claims (1)

[Claims] 1. An arbor 38 and a plurality of split sleeves 40 that are fitted over the arbor 38 and aligned in the axial direction.
In the composite roll split sleeve mounting structure in which each split sleeve 40 has a predetermined expansion margin g between adjacent sleeves 40, at least in the middle of the group of sleeves aligned in the axial direction. The positioned split sleeve 40 has a plurality of key grooves 44a formed at required intervals on one circumferential edge thereof, and a plurality of key grooves 44a formed at a required phase angle with respect to the key grooves 44a on the other circumferential edge thereof. A plurality of key grooves 44b are correspondingly bored, and a key 42 is fixed to the circumferential surface of the arbor 38,
42, each keyway 44 of the split sleeve 40
By facing a and 44b, the arbor 3
8, and the key grooves 44a, 44b are attached to each corresponding key 4 so as not to rotate in the circumferential direction.
2 and 42, the split sleeve 40 is allowed to slide in the longitudinal direction relative to the arbor 38, with a required play in the sleeve axial direction.