JPS5929323B2 - rolling roll - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in compositional mill rolls.

Conventionally, a cemented carbide sleeve C is fitted onto the outer circumferential surface of a steel shaft b having a flange a as shown in FIG. 1, and the sleeve C is screwed onto the outer circumference of the shaft b. A rolling roll is known in which the clamping force is fixed to a shaft b.

This rolling roll is basically of a type that does not need to be disassembled after being assembled, and as shown in the figure, the outer diameter of the cemented carbide sleeve C is made larger than the flange a of the shaft b by the necessary amount. However, when the sleeve C wears down to the same diameter as the flange a, the outer circumferential surface of the flange a is ground and re-grinded so that the outer circumferential surface of the sleeve C always protrudes from the outer periphery of the flange. This process is repeated until the sleeve C reaches its waste diameter, but there is a risk that the sleeve C will break due to the temperature rise during the rolling process, and as a practical matter, the continued use of the shaft b has to be abandoned. When the outer diameter reaches the waste diameter, the entire roll shaft b must be discarded, and therefore a new shaft must be manufactured or rolls must be prepared for each size of the workpiece, which is a drawback that increases the economic burden. Although improvements have been made in the past to reduce the economic burden mentioned above, disassembly and assembly are complicated in connection with re-grinding, and due to differences in properties between roll constituent materials. This method has disadvantages such as a decrease in the bonding force between the shaft b and the sleeve C, making it unsatisfactory for practical use.

The present invention has been devised in view of the above circumstances, and its gist is to improve the tightening method of the smoke hard metal sleeve disposed on the outer peripheral surface of the roll shaft, and at the same time to improve the attachment/detachment operation of the sleeve. The object of the present invention is to provide a rolling roll that can be easily rolled.

Hereinafter, one embodiment of the present invention will be described in detail based on FIG. 2. In the figure, 1 is a steel roll shaft, and a flange 1a is formed at a predetermined position on the outer peripheral surface of the shaft. Tightening nuts 2 are screwed onto the shaft 1 at predetermined intervals 1a.

Bolts 3 are provided inside the nut 2 at equal intervals around the circumference of the nut 2, and are screwed into the nut 2 in the axial direction from the side end surface thereof.

Rings 4 and 5 and a cemented carbide sleeve 6 are removably fitted to the outer periphery of the roll shaft 1 between the flange 1a and the nut 2, respectively.

In the figure, 1 indicates a shaft 1 located between the collar 1a and the ring 5.
It is a ring spring that is fitted into the

The fitting state of each of the above parts to the shaft 1 is such that one axial end surface of the ring 4 and one axial end surface of the ring spring 7 are screwed into the nut 2, and the inner end surfaces of the bolt 3 and the collar 1a are screwed into each other. The other end surface of the ring 4 is in contact with one end surface of the cemented carbide sleeve 6, the other end surface of the ring spring 7 is in contact with one end surface of the ring 5, and the other end surface of the ring 5 is in contact with one end surface of the cemented carbide sleeve. It is in contact with the other end surface of 6.

This cemented carbide sleeve 6 is attached to the one ring 5 mentioned above.
At the contact surface with the cemented carbide sleeve 60, an inclined surface 6' is formed so that the outer circumferential side widens with respect to the plane orthogonal to the axis, and a gap K is provided in an annular shape on the inner circumferential surface. Both sides are held by the rings 4 and 5 for centering.

Therefore, the ring 5 has a tapered surface 5 corresponding to the inclined surface 6'.
These inclined surfaces S/, S/ have an angle β as shown in the figure with respect to the plane perpendicular to the axis, and the flange 1a of the roll shaft 1 and the tightening nut 2 At approximately the center, both sides are located at symmetrical positions (
(not shown).

Both rings 4 and 5 are provided with key grooves 8 and 10 on their inner peripheral surfaces, respectively, and are moved in the axial direction by keys 9 and 11 provided in these key grooves 8 and 10 and protruding from the outer periphery of the roll shaft 1. Possibly engaged.

In the gap provided on the inner circumferential surface of the cemented carbide sleeve 6, since the sleeve 6 has a brittle property against tensile loads, the sleeve 6 is damaged due to internal stress due to thermal expansion of the shaft 1. I try not to damage it.

Note that the coefficient of thermal expansion of the cemented carbide sleeve 6 used in this example is that of the roll shaft 1 and both rings 4 that are in contact with it.
, 5, and the ring spring 7 is made of elastic metal.

Further, the mutual contact surfaces of the rings 4 and 5 that fit with the roll shaft 1 and the ring spring 7 are each coated with hard chrome plating M for rust prevention and prevention of scratches.

Further, the ring spring 1 is made of a metal material having some elasticity, and the spring 7 is inclined toward the ring 5 side from the flange 1a of the roll shaft 1 so that the inner circumferential surface 7' has an inclination angle α with respect to the axis. Corresponding to this inclined surface T', the outer periphery of the roll shaft 1 is also formed into a similar inclined surface 1'.

Further, an annular notched groove 7a is formed along the inner circumferential surface of the ring spring I, which is the inclined surface 7', and a fluid, e.g. A hole 7b for injecting oil or the like is provided.

The contact surfaces 5' and 1' between the ring spring 7 and the roll shaft 1 are plated with hard chrome as described above.

After assembling the rolling roll configured as described above, when this is tightened with the bolt 3, both rings 4, 5 and the cemented carbide sleeve 6 are sequentially pressed and tightened along the roll shaft 1 in the direction of the flange 1a, and the roll is tightened. It is held and fixed to the shaft 1.

In this case, at least one of the contact surfaces of the sleeve 6 with both rings 4 and 5 is formed into an inclined surface 6' as shown in the figure, and the inner end surface 5' of the ring 5 is tapered in a conical shape. Since the ring 5 is formed, the cemented carbide sleeve 6
The gap K is uniform on the circumference and centered, and as the ring spring 7 is tightened, the ring spring 7 in contact with one end surface of the ring 5 receives the internal pressure of the roll shaft 1, and a reaction force is applied in the outer circumferential direction.
The ring spring 7 has a wedge action and a spring action, which acts as a tightening force on both rings 4 and 5 including the cemented carbide sleeve 6.

In addition, in the present invention, the ring spring 7 is
Pressure oil is injected into the annular groove 7a on the inner peripheral surface from the injection hole 7b,
Drain the pressure oil after these operations.

That is, for example, when pressure oil is injected from a hydraulic device (not shown), this pressure oil flows into the annular groove Ia through the injection hole 7b, the pressure in the annular groove 7a increases, and the ring spring 7 moves in the outer circumferential direction. Since the annular spring T can be moved smoothly in the axial direction, the bolt 7 can be further tightened, and therefore tightening can be performed easily and reliably.

If the pressure oil is later removed from the tightening, the ring spring 5 will act in the direction of contraction, and the tightening force will further increase.

Also, if you inject pressure oil from the injection hole 7b when removing it,
The ring spring 7 is in an expanded state, and the ring spring 7 can be moved smoothly. Therefore, the removal operation can be performed easily and quickly, and therefore, pressure oil can be moved in and out of the annular groove 7a of the ring spring 7. This allows for easy and quick tightening and removal, as well as reliable and strong tightening.

Furthermore, when using the reaction force due to the spring action and wedge action of the ring spring 7 as a tightening force to the cemented carbide sleeve 6, the inclination angle α of the inclined surface 7' of the ring spring I is α≧8°. 30'
Conversely, when using the reaction force to remove the cemented carbide sleeve 6 and both rings 4 and 5 from the roll shaft 1, the inclination angle α should be set to 30' and α≦8°30'.
It has been found that it is sufficient to do so.

In other words, the inclination angle of the fitting part between the ring spring T and the shaft 1 is α
If the friction coefficient of the mating surface is μ, then μ-tan α, and since the spring 7 and the shaft 1 are both made of metal materials and their friction coefficient μ is almost constant,
When converted from these, it becomes 8° 30' in α.

Also, when the ring spring 7 is moved toward the flange 1a and tightened,
The reaction force of the ring spring 7 acts on the axial center side of the shaft 1, and therefore,
When α>8°30, the reaction force toward the axis of the ring spring 7 acts as a component force on the link 5 side, and this component force acts as a reaction force to tighten the ring 5, sleeve 6, and ring 4. Therefore, the sleeve 6 etc. can be securely and firmly tightened.

Further, if α is set to 30' and α≦8630', the reaction force on the sleeve 6 when tightened is small, but if the tightened ring spring 7 is lightly hit with a hammer etc., this ring spring 5 Since the ring rapidly moves toward the sleeve 6 and presses the ring 5, sleeve 6, and ring 4 outward, the sleeve 6 and the like can be removed easily and quickly.

Furthermore, hard chrome plating M is applied to the contact surface between the ring spring 7 and the roll shaft 1 to reduce the friction coefficient, and a solid lubricant such as molybdenum disulfide is also used in combination to further enhance the reduction effect. That's how it is.

Furthermore, since the ring spring I is made of a material with a smaller thermal expansion coefficient than the roll shaft 1, the reaction force of the ring spring 70 increases in response to temperature changes during rolling, and the cemented carbide sleeve By increasing the tightening force to the sleeve 6, the sleeve 6 can be held even more reliably.

As described above, the present invention provides a method in which a ring spring is removably fitted to the outer circumferential surface of a roll shaft, the inner circumferential surface of the ring spring is formed to have an inclination angle of α degrees with respect to the axis, and the inclination By changing the angle α degree in accordance with the outer circumferential surface of the roll shaft, it is possible to quickly and easily tighten and remove rings, etc., including cemented carbide sleeves, and it is also possible to reduce the rolling load and temperature rise during rolling processing. In connection with this, it is possible to increase the bonding force between the roll shaft and the cemented carbide sleeve, stabilize the holding, and transmit sufficient necessary torque.

Furthermore, when pressurized fluid is injected into the mating surface of the ring spring and shaft, the ring spring becomes stretched out, allowing smooth movement in the axial direction of the ring spring, making it easy to tighten and remove. It can be done quickly, and has excellent practical effects such as being able to tighten reliably and firmly.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a conventional rolling roll, and FIG. 2 is a partial cross-sectional view of a rolling roll according to an embodiment of the present invention. 1...Roll shaft, 1'...Roll shaft outer peripheral surface inclined surface, 1a...Roll shaft flange, 2...Tightening nut), 4.5. ... Ring, 6 ... Cemented carbide sleeve, 7 ... Ring spring, 7' ... Inclined surface, 1a ... Annular groove, 7
b...Injection hole.

Claims (1)

[Claims] 1. A cemented carbide sleeve or the like is removably fitted between a flange formed at a predetermined position on the outer periphery of the roll shaft and a tightening nut that faces the flange at a predetermined interval. In the rolling rolls held, the inner circumferential surface of the ring spring fitted to the roll shaft is formed into an inclined surface with respect to the axis, and the ring spring is fitted to the outer circumferential surface of the roll shaft corresponding to this inclined surface. A rolling roll characterized in that an annular notched groove is provided in the fitting portion of the ring spring, and a fluid is injected into the groove. 2 The inclination angle α of the fitting part of the ring spring is 8° with respect to the axis.
The rolling roll according to claim 1, wherein the rolling roll is set to 30' or more. 3 The inclination angle α of the fitting part of the ring spring is 30 degrees with respect to the axis.
The rolling roll according to claim 1, wherein α is set in the range of α≦8°30′.