JPH032321Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a roll for a cantilever rolling mill in which a ring roll is attached to the roll shaft via a sleeve.

Conventional technology In wire rod and steel bar rolling mills, the conventional method for attaching a ring roll for a cantilever rolling mill to the roll shaft is to provide a taper on the roll shaft and use a sleeve with a tapered inner diameter between the shaft of the ring roll with a cylindrical hole. By charging the ring roll, the ring roll is fixedly attached to the roll shaft, and torque is transmitted to the ring roll using the frictional force on the inner surface of the cylinder.

In the case of the above-mentioned conventional structure, inserting the tapered sleeve generates a large tensile stress on the outer periphery of the ring roll, and when it is desired to increase the transmitted torque, cracks tend to occur in a direction perpendicular to the circle of the ring. In addition, when the ring roll is a carbide roll, the thermal expansion is smaller (about 1/2) than that of a steel roll shaft and sleeve, and the expansion on the shaft side increases with temperature rise, so the ring roll External stress becomes excessive and cracks occur in the ring roll. Furthermore, since torque is transmitted by internal pressure using only the friction force on the inner surface of the ring roll, the stress limit of the carbide roll means that the diameter of the roll to be discarded is large, and most of it ends up as scrap. It is quite expensive and costs more. Moreover, in addition to transmitting torque using internal pressure, due to the above-mentioned problem of stress on the ring roll, precision is required for the pressing force of the tapered sleeve to be inserted, which causes various problems such as difficulty in adjusting the pressing force. It was hot.

Purpose of the invention This invention aims to eliminate the above-mentioned problems. Torque is transmitted to the ring roll mainly by side pressure applied to the ring roll, thereby preventing the above-mentioned problems caused by torque transmission due to internal pressure. The main object of this invention is to enable the ring roll to be easily attached to and removed from the roll shaft using the same roll attachment/detachment tool.

Structure of the invention In order to achieve the above object, this invention provides a tension member at the center of the roll shaft, and a taper sleeve that fits on one side of the ring roll and the circumferential surface of the ring roll comes into contact with the other side of the ring roll. A roll unit is previously integrated by being clamped with a presser washer, and is removably attached to the roll shaft protrusion of the tension member, has a built-in hydraulic cylinder, and has a nut screwed onto the outer periphery. A roll attachment/detachment tool is provided to fit the roll, and a chrysanthemum-shaped spline is formed on the outer periphery of the nut and the presser washer, and a pull-out ring having a chrysanthemum-shaped spline that is slidably externally engaged with these splines is provided, and the roll is removed. With the unit attached to the roll attachment/detachment tool via the pull-out ring, push it onto the roll shaft, and while applying tensile stress to the tension member with a hydraulic cylinder, fit the tapered sleeve of the roll unit onto the roll shaft and insert it while aligning the center. The installation of the rolls is completed when the tensile stress of the tension member and the compressive force of the roll unit are balanced according to the set pressure oil, and side pressure from the compressive force is applied to the ring roll, causing it to rotate by the frictional force. The present invention provides a roll for a cantilever rolling mill that is characterized by transmitting torque.

Embodiments Hereinafter, this invention will be explained in detail with reference to embodiments shown in the drawings.

In the cantilever rolling mill shown in Fig. 1, 1 is a roll shaft, 2 is a round bar-shaped tension member loosely inserted into a shaft hole 1a drilled along the axial center of the roll shaft 1, and 3 is a roll shaft. This is a roll unit that can be detachably attached to 1, and is integrated in advance with a bolt 7 with a ring roll 4 being held between a taper sleeve 5 and a pressing washer 6. Reference numeral 8 denotes a roll attachment/detachment tool for assembling and disassembling the roll unit 3 into the roll shaft 1, and is composed of a hydraulic cylinder 10 having a built-in piston 9 and a nut 11 screwed onto the outer periphery of the hydraulic cylinder 10. 12 is a pull-out ring that locks the roll unit 3 with the roll attachment/detachment tool 8, and 20 is a recombination jig that is detachably attached to the cylinder 10 of the roll attachment/detachment tool 8.

The tension member 2 has its driving side end connected to the nut 1.
3 to prevent it from coming off from the roll shaft 1, and the other end of the roll side is made to protrude from the tip of the roll shaft 1, and a chrysanthemum-shaped spline 1 is attached to the protrusion.
4 is fixed with screws.

In the roll unit 3, both left and right side surfaces 4a and 4b of the ring roll 4 are tapered to expand inward, and the circumferential surface 4c of the ring roll 4 is also tapered, while the ring roll 4 is fitted inside. The outer circumferential surface 5a of the tapered sleeve 5 is also tapered, and the roll side is provided with a tapered collar 5b so as to come into contact with the inner surface of the ring roll. It is set to do so. The inner surface 6a of the pressing washer 6 that is brought into contact with the other side surface 4b of the ring roll 4 is also tapered, and a stepped portion 6b that protrudes toward the circumference is provided at the outer end. The roll unit 3 consisting of the ring roll 4, the taper sleeve 5 and the pressing washer 6 has the ring roll 4 and the pressing washer 6 fitted around the taper sleeve 5, and the ring roll 4
Assemble by sandwiching both sides between the collar 5b of the tapered sleeve 5 and the side 6a of the pressing washer 6,
The bolts 7 are screwed into the stepped portion of the tapered sleeve 5 from the stepped portion 6b of the pressing washer 6 and are tightened to be integrated in advance. Also, the outer end of the circumferential surface of the tapered sleeve 5 and the stepped portion 6 of the pressing washer 6
The splines 5d and 6c are formed on the circumferential surface of the roll shaft 1, and the spline 5 is formed on the outer end of the outer circumferential surface of the roll shaft 1.
A spline 1b is formed which meshes with the rollers d and 6c to transmit torque between the roll shaft 1 and the roll unit 3.

In the roll attachment/detachment tool 8, a shaft hole 10b provided with a spline 10a is provided in the center of the cylinder 10, and the spline 10a is slidably engaged with the chrysanthemum-shaped spline 14 fixing to the tension member 2 and fitted onto the outside. and the roll side inner end surface 10
An annular groove 10d opened at c is formed, and the groove 10d
At the same time inserting the annular piston 9 into the groove 1
A hydraulic passage 10g is provided that communicates with a pressure oil port 10f provided on the outer end surface 10e on the opposite roll side from 0d, so that the pressure oil port 10f can be connected to a hydraulic circuit (not shown). Further, a screw 10h is provided on the outer peripheral surface of the cylinder 10, and a nut 11 is attached to the screw 10h. A chrysanthemum-shaped spline 11a is provided at the inner end of the outer peripheral surface of the nut 11, and the pressing washer 6
A chrysanthemum-shaped spline 6d is also formed at the outer end of the outer peripheral surface of the pull-out ring 12, while a female chrysanthemum-shaped spline 12a is formed on the circumferential surface of the pull-out ring 12 to slidably engage with the splines 6a and 11a. After the ring 12 is externally fitted by engaging its splines 12a, 6d, and 11a, the ring 12 is rotated by the width of the splines after being moved toward the nut 11 to prevent the pull-out ring 12 from coming off the pressing washer 6. There is.

Next, a method for incorporating roles will be explained. After attaching the previously integrated roll unit 3 to the roll attachment/detachment tool 8 via the pull-out ring 12, the roll unit 3 and the roll attachment/detachment tool 8 are moved to the roll axis using the recombination jig 20 attached to the roll attachment/detachment tool 8. 1 side, the roll unit 3 is fitted around the tapered sleeve 5 onto the roll shaft 1, and the spline 10a of the cylinder 10 is connected to the chrysanthemum-shaped spline 14 fixed to the tension member 2.
Push it in until the gap shown by A in the figure is created, and then rotate the cylinder 10 by the width of the spline 10a to prevent the roll attachment/detachment tool 8 from coming off from the tension member 2. Next, loosen nut 11,
Slide the pull-out ring 12 toward the nut 11. Next, a hydraulic hose (not shown) is connected to the pressure oil port 10f, pressure oil is fed to the groove 10d, and the piston 9
Press. The piston 9 is located at the end face 1 of the cylinder 10.
Exit from 0c and extend the tension member 2 in the direction of arrow _X1 ,
A gap appears between the nut 11 and the pressing washer 6. Next, Natsuto 1 until the corresponding Sukimaro runs out.
1 is tightened, and then the pressure oil is removed, the tension member 2 contracts, the tapered sleeve 5 of the roll unit 3 is press-fitted into the roll shaft 1, and the end 5g of the sleeve 5 is pressed into contact with the member 21 fitted onto the roll shaft 1. be done. Furthermore, when the above operations are repeated again to pressurize the piston 9, tighten the nut 11, and release the pressure oil, a tensile stress corresponding to the pressure oil at the set pressure remains in the tension member 2, and the nut 11, The pressing washer 6, ring roll 4, and tapered sleeve 5 stand still in a state where the compressive force is balanced. When assembling the roll unit 3 onto the roll shaft 1, the tapered portion 5a of the tapered sleeve 5 is pushed in to eliminate the gap with the inner tapered portion 4c of the ring roll 4, and the roll shaft 1
Center alignment between the ring roll 4 and the ring roll 4 is performed.

As described above, by attaching the ring roll 4 to the roll shaft 1, when the roll shaft 1 is rotated, the roll unit 3 is transmitted to ring roll 4
The friction force at the contact portions C and D between both side surfaces 4a and 4b of the tapered sleeve 5 and the pressing washer 6 is transmitted to the ring roll 4, and the ring roll 4 is rotated mainly by side pressure due to compression force. Also,
The rotational force is also transmitted by the internal pressure at the contact portion E between the circumferential surface of the ring roll 4 and the outer circumferential surface of the tapered sleeve 5.

The transmission torque Tt due to the side pressure and the transmission torque Tr due to the internal pressure are as follows.

T〓=πμBδ(R ₂ ² + R ₁ ² /R ₂ ² −R ₁ ² ×1/E ₁ +1/E ₂
+γ ₁ /E ₁ +γ ₂ /E ₂ ) However, as shown in FIG. Tightening allowance at γ ₁ part due to pushing E ₁ : Longitudinal elastic modulus of taper sleeve 5 E ₂ : Longitudinal elastic modulus of ring roll 4 γ ₁ : Poisson's ratio of taper sleeve 5 γ ₂ : Poisson's ratio of ring roll 4 Overall transmitted torque T becomes T=Tt+Tr.

In addition, the torque transmitted due to internal pressure is
In the case of a carbide roll, the coefficient of thermal expansion is approximately 1/2 that of steel, the tightening margin increases with temperature rise, and the tensile stress is smaller than the compressive stress, so T
It is preferable to select ≧0.5Tr (Tr=0.1 to 0.5T).

During the above-mentioned torque transmission, the compressive force applied to the ring roll 4 does not loosen due to the pressing force by the nut 11. Further, the tension member 2 does not expand or contract due to transmitted torque, and a stable tightening force can be obtained.

When separating the roll unit 3 from the roll shaft 1, connect a hydraulic hose to the pressure oil port 10f of the roll attachment/detachment tool 8, loosen the nut 11 under pressure, and remove the pull-out ring 12 as shown in FIG. When the ring roll 4 is set as shown, the hydraulic pressure is removed, and the nut 11 is loosened again, the ring roll 4 is removed from the roll shaft 1 along with the taper sleeve 5 and the pressing washer 6. When the cylinder 10 is rotated, it can be removed from the tension member 2. The roll attachment/detachment tool 8 and the roll unit 3 can be removed at the same time.

Effects As is clear from the above explanation, according to the roll of the cantilever rolling mill according to this invention, a tension member is provided at the center of the roll axis, and a roll attachment/detachment tool with a built-in hydraulic cylinder is used to apply tension to the tension member. Side pressure is applied to the ring roll by the compressive force of the pressing washer and tapered sleeve that balances the applied tensile stress, and rotational torque is mainly transmitted to the ring roll by the frictional force caused by the side pressure. Problems such as ring cracking that occur when torque is transmitted using only the frictional force on the inner surface of such a ring roll do not occur. In addition, if the ring roll is a carbide roll, if the rotational force is transmitted by side pressure, the stress will be compressed, which is suitable for the material, and high torque can be transmitted even to a relatively small diameter, and the roll original The unit can be small, which is advantageous in terms of cost.

Furthermore, the roll unit can be easily assembled and attached to the roll shaft using the roll attachment/detachment tool, and since the tapered sleeve is provided between the ring roll and the roll shaft, alignment can be easily performed. Moreover, it has various advantages such as less damage to the roll shaft.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of the entire rolling mill according to this invention, Figure 2 is an enlarged sectional view of the main parts of Figure 1, and Figure 3 is an enlarged sectional view of the main parts of Figure 1.
The figure is a view taken along the X arrow in FIG. 2, FIG. 4 is an explanatory diagram of the transmitted torque, and FIG. 5 is a cross-sectional view of the disassembled operation. DESCRIPTION OF SYMBOLS 1... Roll shaft, 2... Tension member, 3... Roll unit, 4... Ring roll, 5... Taper sleeve, 6... Pressing washer, 8... Roll attachment/detachment tool, 9... Piston, 10... ...Cylinder, 11...
...Natsuto, 12... Pull-out ring.

Claims (1)

[Scope of utility model registration request] A ring roll is provided with a tensile member at the center of the roll axis, and has conical cross sections on both left and right sides and the circumferential surface, a tapered sleeve fitted on one side and the circumferential surface of the ring roll, and a pressing member in contact with the other side. A roll unit is provided in which a washer is assembled in advance, and a roll attachment/detachment tool is provided for attaching/detaching the roll unit to/from the roll shaft, and the roll attachment/detachment tool includes a hydraulic cylinder having spline engagement with a tension member protruding from the roll shaft. , a nut screwed into the hydraulic cylinder, a pull-out ring that engages with a spline provided on the outer periphery of the nut and a spline provided on the outer periphery of the pressing washer of the roll unit, and the tension member is subjected to tensile stress with the hydraulic cylinder. A cantilever type rolling mill characterized in that a compressive force is applied to the roll unit by tightening it with a nut and the ring roll is assembled into a roll shaft, and the rotational force is mainly transmitted by side pressure from both sides of the ring roll. roll of.