SU1680394A1 - Tube cold rolling mill roller drive - Google Patents

Description

The invention relates to pipe production and relates to the improvement of the drive rolls of cold rolling mills. The aim of the invention is to increase the yield due to the provision of a given ratio of the periodicity of one-sided rotation of the rolls during the forward and reverse course of the moving stand.

The angles of rotation of the rolls during direct and reverse moves are not equal to each other; during the forward stroke, the angle is larger, during the reverse, it is smaller, which ensures the implementation of the greatest (possible) work of deformation during the forward course of the cage. The drive includes a gear with gears 1, wheels 2 and 3 mounted on the necks of the rolls 4 and wheels respectively, mounted on frame 8 mirrored relative to each other, rails 6 and 7. The wheels have working and non-working sections of different angular lengths. Wheels 2 of the forward stroke interact with the laths 6 during the forward stroke of the cage 5. When the direction of movement of the cage changes, a change of gear-rack engagement occurs (forward stroke 2, 6 nz reverse 3, 7). The rolls at the same time rotate in the same direction with a predetermined coefficient of periodicity of the angular displacements during the forward and reverse stroke. The formula of the invention provides a mathematical relationship to determine the ratio between the main parameters of the gear-rack gear and the angular length of the working areas, 3 sludge.

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Fig 1

1680394 A1

1680394

The invention relates to pipe production and relates to the improvement of the drive rolls of cold rolling mills (CPT).

The aim of the invention is to increase the yield due to the provision of a given ratio of the periodicity of one-sided rotation of the rolls during the forward and reverse course of the moving stand.

FIG. 1 shows the drive of the rolls of the cold rolling mill tube, a general view; in fig. 2 - working and non-working areas of the work rolls (a) and the corresponding parts of the gearing (b) at the time of the forward running of the stand; in fig. 3 - the same, with the reverse course.

To simplify the position of the rolls (a) and the corresponding position of the gear-rack gear (b) are conventionally spaced apart.

The drive of the HPT mill rolls with a movable cage contains a gear gear of gear 1. which, together with the wheels 2 forward and 3 reverse, are set to>; <hard rollers 4. placed on bearings in windows of the movable body 5. The gears of the rolls are kinematically connected to each other, and wheels with the corresponding rails 6 and 7, mounted on the frame 8 mirror relative to each other. The wheels (sectors) have non-working and working sections of different angular extent (φ \ and yes), corresponding to the working (crimping) <p \ and non-working · (рг areas of work rolls. Angular extensions of the working sections (y? 1, (wg) wheels 2 , 3 (respectively) are related to each other math for, .. ϋ2 ГП2 Ζ2 гч гх

dependence (pr! _t1 ' ^where θ ¹ ' θ ²

diameters of pitch circles, and t 1, tg, ι. Ζ2 - respectively, the gearing modules and the number of teeth of the wheels; K - coefficient = 1.2 ... 1.0; obtained experimentally by analytical means.

The drive rolls mill HTP works as follows.

At the initial moment of the translational movement of the housing 5 and the rotation of the rolls 4, the workpiece is fed (not shown in Fig. 1-3). Since the working area φ \ of the wheel 2 is in the course of a forward stroke meshed with the rack 6, both rolls 4 turn, synchronized by gear 1 (FIGS. 1 and 2). The streams of the rolls 4 produce compression (plastic deformation) of the billet to the size of the finished pipe on the mandrel with a variable decreasing in the course of rolling the radius of the cross section.

In the extreme forward position of the housing 5, the pipe is released from the action of the streams on the rolls 4, and the working section of the wheels 2 leaves the engagement with the rails 6.

At the same time, the working section (γ? Ι) of the wheels 3 is engaged with the rails 7. During the return stroke of the cage, the workpiece does not deform, since in the (non-working) section of the roll barrel and at a limited angle radius

The housing 5 under the action of the crank mechanism of the drive with increasing increasing speed begins to move in the opposite direction (Fig. 3).

At the end of the reverse stroke, the working sections of the wheels 3 are released from the engagement with the rails 7, the reverse stroke of the body 5 stops, the working sections of the wheels 2 of the forward stroke engage again with the rails 6. Then the cycle repeats. Thus, the work rolls rotate in the same direction, with the forward and reverse course of the cage and provide rolling in direct motion due to alternating gearing of the wheels 2,3 with rails 6,7.

Since the length and time of the forward and reverse moves are the same, then the turn rotation time is the same for the forward and backward strokes, but since it is more rational to perform the greatest deformation work during the forward run of the body 5, the turning angles φ \ and (roll rolls are not equal between them. Rotation to a smaller angle <pg during the return stroke of the body is performed at the same time as turning to a larger angle <ρ, that is, with unequal periodicity. Increasing the values of the angle of rotation y? 1 to the greatest increase the amount of deformation during the forward course and so sa The separate drive of one-sided rotation of the rolls during the forward and reverse course of the housing allows you to select rational (by durability) parameters of a rack-and-pinion drive (a rational combination of modules, number of teeth, diameters of the pitch circles for this steel grade and roll diameter with route rolling).

Claims (1)

Claim The drive of the rolls of the cold rolling mill tube containing two pairs of synchronizing gears mounted on the necks of the rolls, stationary rails and gears interacting with them, sitting on different necks of the same roll, about 5 1680394 6 Considered by the fact that, in order to increase the output of the GBD by ensuring a given ratio of one-sided periodicities, rotation of the rolls during the forward and backward movement of the moving stand, it is equipped with additional rails and associated additional wheels mounted on the necks of the same roll, and all the wheels are made with smooth non-working areas of non-10 angular extent, and the angular length of their working areas φ \ and <pg. connected with the diameters of the pitch circles ι and Og, the engagement modules ta and π 5 and the number of teeth Ζι and 2g of the working sections through the coefficient K = 1.2 ... 1.0 by a mathematical expression „Р2 П) 2 Ζ2 φ \ ~ ^to Οι пщ ι