JPS5929322B2 - rolling roll - Google Patents

Description

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

Conventionally, a cemented carbide sleeve C was fitted onto the outer circumferential surface of a copper shaft b having a flange a as shown in FIG. A rolling roll is known in which the clamping force is fixed to a lever 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 part a of the shank (b) to the extent necessary. 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 a re-grinding operation is carried out so that the outer circumferential surface of the sleeve C always protrudes from the outer circumferential surface of the flange. This process is repeated until the hard metal sleeve C reaches the scrap diameter, but there is a risk that the sleeve C will break due to the temperature rise during rolling, and in reality, it may be necessary to abandon the continued use of Shan) b. The problem is that if the outer diameter of the used roll reaches the discarded diameter, each roll shan) b must be discarded,
Therefore, there is a disadvantage in that it is an economical burden, as it is necessary to manufacture a new shaft and prepare rolls for each size of the workpiece.

Furthermore, although improvements have been made in the past to reduce the above-mentioned economic burden, disassembly and assembly are complicated in connection with re-grinding, and due to differences in properties between roll constituent materials, shan) b This method has drawbacks such as a decrease in the bonding strength of the sleeve C and other problems, 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 method of tightening the cemented carbide sleeve provided 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 roll shaft made of copper, and a flange 1a is formed at a predetermined position on the outer circumferential surface of the roll shaft. Tightening nuts 2 are screwed onto the shaft 1 at predetermined intervals.

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.

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

The state in which the above-mentioned parts are fitted to the shaft 1 is such that one end surface in the axial direction of the ring 4 and one end surface in the axial direction of the ring spring 7 are respectively attached to the inner end surfaces of the bolt 3 screwed into the nut 2 and the collar portion 1a. The other end surface of the ring 4 is in contact with a cemented carbide sleeve 6.
One end surface of the ring 5 contacts one end surface, the other end surface of the ring 5 contacts one end surface of the ring 5, and the other end surface of the ring 5 contacts the other end surface of the cemented carbide sleeve 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 6' and 5' form an angle β as shown in the figure with respect to a 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 K provided on the inner peripheral surface of the cemented carbide sleeve 6 described above, since the sleeve 6 has a brittle property against tensile loads, internal stress due to thermal expansion of the shaft 1, etc. 6 to prevent damage.

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 an 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.

Furthermore, the ring spring 7 uses a metal material that has some elasticity,
The spring 7 has an inner circumferential surface 7' inclined toward the ring 5 from the flange 1a of the low shaft 1 so as to have an inclination angle α with respect to the axis. The outer periphery of the roll shaft 1 is also formed into a similar inclined surface 1'.

After assembling the roll with the above configuration, bolt 3
When tightened, both rings 4 and 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 are held and fixed to the roll 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 this case, 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 ring spring 7 should be α>8°30'. On the other hand, when the reaction force is used to remove the cemented carbide sleeve 6 and both rings 4 and 5 from the roll shaft 1, the inclination angle α becomes 30'(α≦8°30'). It turns out that you can do this.

That is, if the angle of inclination of the fitting portion between the ring spring 7 and the shaft 1 is α, and the friction coefficient of the fitting surface is μ, then μ=−α, and both the ring spring 7 and the shaft 1 are made of metal materials. Since these friction coefficients μ are 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, so that α
〉8°30', the reaction force toward the axis of the ring spring 7 acts on the ring 5 side as a component force, 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 firmly tightened.

If α is set to 30'(α≦8°30'), the reaction force on the sleeve 6 when tightened is small, but if the tightened ring spring 7 is lightly hit with a hammer or the like, this ring spring 7 suddenly moves toward the sleeve 6 side, and the ring 5, sleeve 6,
Since the ring 4 is pressed outward, the sleeve 6 etc. 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 coefficient of friction, and a solid lubricant such as molybdenum dioxide is also used in combination to further enhance the reduction effect. It's Nishide.

Furthermore, since the ring spring 7 is made of a material with a smaller coefficient of thermal expansion than the roll shaft 1, the reaction force of the ring spring 7 increases in response to temperature changes during rolling, and the cemented carbide By increasing the tightening force to the sleeve 6, the sleeve 6 can be held more securely.

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 remove the tightening of rings, etc. including cemented carbide sleeves, and it is also possible to reduce the rolling load and temperature rise during rolling process. Relatedly, it has excellent practical effects, such as increasing the bonding force between the roll shaft and the cemented carbide sleeve, stably holding it, and transmitting a sufficient amount of the necessary torque α.

[Brief explanation of the drawing]

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 inclined surface, 2...Tightening nut, 1
a... Roll shaft flange, 4, 5...
・Ring, 6...Cemented carbide sleeve, 7...
... Ring spring, 7' ... Inclined surface, α ...
・Inclination angle between the inner peripheral surface of the ring spring and the axis, M...Hard chrome plating.

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 each other at a predetermined interval, In the tightly held rolling roll, the inner peripheral 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 peripheral surface of the roll shaft corresponding to this inclined surface. A rolling roll characterized by: 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 the rolling roll is set in a range of '<α≦8°30'.