Three-roll mill longitudinal rolling

 

(57) Abstract:

The invention relates to rolling production and can be used in the reduction and sizing mills for the manufacture of pipes, as well as in mills for continuous rolling of rods and wire. The inventive three-roller mill includes a housing 1, the bores of which the bearing supports 2 posted by drive shaft 3 with the working roller 4 and bevel gears 5 and 6, and inclined thereto at equal angles two shafts 7 and 8 with the working rolls 4, having at least one bevel gear 9, 10. Bevel gears 5, 6, 9, and 10 were made with a circular shape of a tooth, the direction of the generatrix line of which coincides with the direction of rotation of the corresponding shaft. The invention allows to increase the load capacity of the gears, to provide a more smooth and transmit a higher torque. 4 Il.

The invention relates to rolling production, and more precisely to the three-roll mill longitudinal rolling, and can be used when designing the pressure reducing and sizing mill for pipes and mills for continuous rolling of rods and wire.

Known three-roll reducing mill (1), with aetsa by transferring torque from one drive roll is a bevel gear, located console on the supporting shafts of the other two rolls.

A disadvantage of the known design of the cage is a low load capacity and durability due to low load capacity conical toothed gearings and bearings for rolls, placed in a confined space housing three-roll stands, and also due to the uneven distribution of radial and axial loads on the bearings of the rolls arising in the toothed gearings.

From the known three-roll mill longitudinal rolling closest in technical essence is a three-roller working crate reducing mill (2), comprising a housing, the bores through which bearing is placed a shaft with a working roller and tapered gears, and inclined thereto at equal angles two shafts with work rolls having one bevel gear.

A disadvantage of the known constructions of three-roller working stand reduction mill is a low load capacity and durability due to the low load capacity of the gears and bearings for work rolls, placed in a limited space of the shell made of a support shaft, emerging in the toothed gearings.

The objective of the invention is to increase the load capacity of the gear bevel gearing and ensuring the transmission of higher torques.

The proposed design run three-roll stands longitudinal rolling provides increase its load capacity and durability due to the fact that the circular shape of the tooth bevel gears provide smoother operation of the gearing and transmits higher torque, since the contact area in this case is increased, and the coincidence of the direction of their generatrix line with the direction of rotation of the corresponding shaft enables you to evenly distribute radial and axial loads on the bearings, resulting in toothed gearing in the transmission of torque.

In Fig. 1 shows a kinematic diagram of the three-roll stands longitudinal rolling; Fig. 2 - the option of arranging the gears and bearing three-roll stands longitudinal rolling; Fig. 3 - scheme of radial and axial forces engaged the coincidence with the direction of the generatrix line of the inclination of the tooth with the direction of rotation of the shaft; Fig. 4 is a diagram of the radial INIA shaft.

Three-roll mill longitudinal rolling consists of a casing 1, are placed in the bores through the bearing 2 shaft 3 with the working roller 4 and bevel gears 5 and 6, and inclined at equal angles to the shaft 3 of the two shafts 7 and 8 with the working rolls 4, each of which has a corresponding bevel gear 9, 10. Bevel gears 5, 6, 9, and 10 were made with the circular gear, the direction of the generatrix line of which coincides with the direction of rotation of the corresponding shaft (Fig. 1 and 2).

The device operates as follows.

Torque from the drive shaft 3 by means of bevel gears 5, 6, 9, 10 is transmitted to the shafts 7 and 8. In calibre, formed by the rollers 4, set the workpiece and is crimped to the desired diameter. This circular form of tooth bevel gears provide smooth quiet operation of the gearing and makes it possible to transmit higher torque, since the engagement with the circular shape of the tooth contact patch is larger and higher Flexural endurance compared to the mesh, where the form of the tooth straight.

Efforts in the links as follows. If the angle of inclination of the generatrix line of the tooth coincides with napravlenieah P and axis Q of the effort is in engagement with forming a separating cone angle , more 90about( > 90about). The vectors FWand Ftolie on one line and their absolute values are equal (Fto)=(FW), as the force of action is equal to the reaction force from the conditions of equilibrium, with > 90aboutas force FWin the calculated cross section perpendicular to a generating line of the tooth. If the angle of inclination of the generatrix line of the tooth does not coincide with the direction of rotation of the shaft (Fig. 4) < 90about.

For gearing, where the form of the straight tooth, = 90about. When = 90aboutradial components of PWand Ptoand axial components of QWand Qtofrom the efforts of the Ftoand FWrespectively, i.e., PW=Ptoand QW=QK.< / BR>
With increasing angle , i.e., > 90about(Fig. 3) PW<Pand QW>Qtoaccordingly when the < 90about(Fig. 4) PW>Ptoand QW<Q. Due to the fact that on the shaft 3 mounted two gears 5 and 6, the radial load on the bearing support efforts in engagement will double PW=2PW. The axial load on the bearings of the shaft 3 is in this case equal to 0, since the axial forces on the gears 5 and 6 are directed in opposite directions and will mutually of Compline tooth coincides with the direction of rotation of the shafts, as for the bearing support of the shaft 3 acts total radial load forces PWsmaller absolute value of the radial load Ptoacting on the bearings of the shafts 7 and 8. In this regard, the bearing support shaft 3, 7 and 8 are more evenly loaded radial forces from the operation of the gearing compared to the condition when the direction of the generatrix line of the tooth does not coincide with the direction of rotation of the shafts (Fig. 4) and a bearing support shaft 3 acts radial force resulting from the sum of large forces PW(PWwhen <90 o>Pto).

At > 90aboutlarge in absolute value the efforts of QWmutually compensated, and a bearing support shafts 7 and 8 are powers of Qtomuch smaller in absolute value than QW. When <90 oobviously the opposite: the smaller force QWmutually compensated, and on the bearings of the shafts 7, 8 are large axial load Qto. Therefore, when the coincidence of the generatrix line of the inclination of the tooth with the direction of rotation Valov their bearings will be more evenly loaded, which increases their load capacity and durability to stand the loading capacity and ensures transmission of higher torques.

Three-roll MILL LONGITUDINAL ROLLING, comprising a housing, the bores through which bearing is placed a shaft with a working roller and tapered gears and inclined thereto at equal angles two shafts with work rolls having one bevel gear, wherein the bevel gear is made with a circular shape of a tooth, the direction of the generatrix line of which coincides with the direction of rotation of the corresponding shaft.

 

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