FR2535628A1 - METHOD FOR DRIVING PLANETARY ROLLING MILL AND DEVICE FOR IMPLEMENTING SAME - Google Patents

Abstract

PROCEDURE AND DEVICE FOR CONDUCTING A PLANETARY LAMINATOR ACCORDING TO WHICH WORKING CYLINDER 1 TRAVELS AN ORBIT 3 ON A PORTION 4 OF WHICH, AT LEAST, IT COMES IN CONTACT WITH THE PRODUCT TO BE ROLLED 5. ACCORDING TO THE INVENTION, IT IS CONFERRED TO THE MOVEMENT OF CYLINDER 1 ON THE SAID PORTION 4 OF THE ORBIT, AN S-SHAPED HORIZONTAL TRAJECTORY, THIS PORTION BEING, ON THE ONE HAND, LIMITED BY TWO POINTS A AND B WHERE THE TANGENTS T AND TA ARE THE ORBIT 3 PARALLEL BETWEEN THEM AND THE DIRECTION OF LAMINATION OF THE PRODUCT 5 AND PRESENTING, ON THE OTHER HAND, BETWEEN THESE TWO EXTREME POINTS, AN INFLATION POINT I. THE INVENTION ALLOWS SHOCK-FREE PLANETARY LAMINATION BETWEEN THE WORKING CYLINDER AND THE PRODUCT TO BE ROLLED, OR AT LEAST WITHOUT SHOCKS PREJUDICE TO THE HOLDING OF THE EQUIPMENT OR AS TO NUISANCES BY NOISE.

Description

2535628,

  METHOD OF CONDUCTING A PLANETARY LAMINATOR

AND DEVICE FOR IMPLEMENTING

  The present invention relates to a family of rolling processes in which the work rolls are movable in space and come into contact with the product periodically, on all or part of

their trajectory.

  Rolling plants built according to this principle are now well known under the name "planetary mill" and have a particular design from a series of small horizontal working cylinders, arranged in "squirrel cage" rotating large speed around support rollers mounted in "duo" on the

else of the product.

  For convenience for the future, it is appropriate to qualify as "planetary" any rolling mill, whatever its design, whose cylinders

  working conditions meet the mobility criteria indicated above.

  It is known that the principle of the planetary mill solves the problem of rolling products at a very slow speed of travel (for example of the order of 1 m / min) thanks to the superposition of the displacement movement in the space of the axis. geometry of the working cylinder with its usual rotational movement on itself, which ensures a time of

  very short contact between the product to be rolled and the cylinder.

  Apart from the known variant known as "oblique rolling", in which the working roll * is permanently in contact with the product, which necessarily has a periodic symmetry of revolution (which limits singularly the field of application), the main variants of planetary rolling all have in common the existence of a discontinuity in speed between the orbit of the cylinder and the direction of the flow of the metal to be rolled at the entrance of the rolling mill. This discontinuity results in a relatively every time a cylinder comes into contact with the product to be rolled (on the order of 2 to 3,000 times per minute), resulting in very severe mechanical stress on the equipment and painful working conditions for the personnel due

noise caused.

  In one version, proposed by the English Law Society 'Hille Engineering', the cylinder travels its orbit up the chock of the support cage and connects almost tangentially with the product, which should have the effect of reducing the sound level To the knowledge of the inventor, this solution has, however, only been proposed for

2535628.

  long products and requires rolling "up" (i e opposite the

  direction of movement of the rolling stock), which limits the applicability of the

  process. The object of the present invention is to solve the problem of these repetitive shocks of the noise nuisance specific to the planetary rolling mill by means of a solution which does not have the drawbacks of the known methods. To this end, the subject of the invention is a method for driving a planetary rolling mill according to which the working roll travels an orbit over a portion of which at least it comes into contact with the product to be rolled, a process characterized in that the direction of rolling of the product being assumed to be horizontal, the movement of the cylinder, on said portion of the orbit, is conferred on a trajectory in the form of "S" in the horizontal and limited by two points where the tangents to the orbit are

  parallel to each other and to the rolling direction of the product.

  The invention also relates to a device for implementing the method, characterized in that it is constituted by a combination of eccentrics and connecting rods which print on the axis of the rolling cylinder a displacement in the space according to an orbit comprising a portion of trajectory in the form of "S" horizontally bounded by two points where the tangents to said orbit are parallel to each other and to the direction of

displacement of the product to be rolled.

  The invention will be better understood and other aspects and advantages

  appear more clearly in view of the description which follows, given in

  references to the accompanying drawing plates, in which FIG. 1 is a schematic diagram of the process, showing the portion of the orbit of the working roll in contact with the product, FIGS. 2, 3 and 4 are schematic diagrams showing different variants of a device for the implementation

of the process.

  FIG. 1 shows at 1 a work roll whose axis 2 passes through a closed loop orbit. For a better understanding of the invention, only the part of the orbit that is close to the product

  5 is shown in the figure.

  More precisely, the portion 4 of this orbit, along which the cylinder 1 is in contact with the product 5, has a trajectory in the form of "S" horizontally limited by two extreme points A and B where the tangents TA , TB to the orbit 3 conducted at these points 39 are parallel to each other and parallel to the rolling direction of the

253562.

  product 5, indicated by the arrow v in the figure and which, in practice, can

  to be considered generally as perfectly horizontal.

  The trajectory 4 advantageously has a point of inflection I to ensure a smooth movement of the cylinder 1 between the extreme points A and B. To enable rolling, an opposing system A'I'B 'is symmetrically arranged at the first system AIB relative In this counter-system A'I'R ', the same elements and arrangements are found in the AIB system as in the AIB system.

  references that are differentiated only by the sign "prime".

  The axes 2, 2 'of the working rolls 1, 1' are horizontal and perpendicular to the plane of the figure. It is thus seen that the thickness of the rolled product 5 is thus reduced by the quantity 2 d (d being the distance separating the tangents TA and TB respectively TA 'and TB'-), when the

  cylinders 1 and 1 'run through their respective arc AB and A'B'.

  These cylinders can travel their arc in one direction or in

  the other, it being understood that they move simultaneously in the same direction.

  In the remainder of the description, it will be considered, for simplicity, only the

  displacement of the upper working cylinder 1 When, as shown in the figure, this cylinder travels the arc AB from A to B, it comes into contact with the product 5 at A and leaves it at B between these two points, the contact with the product is permanent to exert the rolling force, and the roll rolls on the surface of the product, in the direction of rotation indicated by the arrows. According to the invention, the part of the orbit 3 located beyond the point A, ie the part of the path taken by the axis 2 just before the cylinder comes into contact with the rolling product at A, can: or continue, on the other side of the tangent TA, without any significant change in the direction of the speed sector, the point A being then a point of inflection (variant indicated by the circled letter O in the figure), or, according to another variant, continue with reversal of the direction of the speed sector, the point A being in this case a point of

  cusp (variant identified by the circled letter).

  Whatever the variant used, the trajectory of the cylinder 1 tangentially connects the surface of the product to be rolled 5 and it does not

can, therefore, be shock.

  It goes without saying that the preceding provisions also apply to point B if it is desired to roll the product 5 "up", that is to say if the cylinder 1 must travel its arc of AB work in the direction from B to A In this case, however, it should be noted that the connection B is not strictly tangential to the surface of the product 5 because of the slight advance of the latter during the time when the cylinder 1 loop orbit 3 from A to B outside the 4 portion (case where orbit 3 is traveled in full still in the same direction) It can therefore occur in B a very light shock, but the noise level remains out of proportion to the noise caused by the

existing known methods.

  On the other hand, in the case where the working arc AB is traversed alternately from A to B and then from B to A, the cylinder 1 remains permanently in contact with the product to be rolled 5 and consequently there will be no

no shock.

  Moreover, in order not to risk damaging the good surface quality of the rolled products, it is advantageous to avoid slippage of the

  cylinder on the product at the time of coming into contact.

  For this purpose, according to a preferred embodiment of the invention, the cylinder is printed at the moment of its coming into contact with the product, a speed of rotation equal to or in any case close to that which corresponds to the conditions of the invention. rolling of the cylinder on the product to be rolled (the latter being defined, therefore predeterminable as known and as we know how to calculate it, from the speed of the product to be rolled, and the value and direction of the speed of the cylinder on its orbit at the moment

contact with the product).

  Of course, in the case of the variant, the speed of displacement of the cylinder being necessarily zero at the moment of coming into contact at A (since the latter is a cusp), the speed of rotation of the cylinder about its axis 2 will be advantageously zero to

this moment too.

  Similarly, the possible problems of synchronization of the speed of rotation of the cylinder at the moment of contact do not arise in the case where the working arc is traversed alternately from A to B and from R to A, since the working cylinder then remains permanently in contact with the

product to be rolled.

  Whatever the variant chosen, the working cylinder is rotated about its axis 2 under the effect of the cissions that originate in contact with the rolled product. The energy is supplied by the motors controlling the system that generates the movement of the cylinder. sure

39 its orbit.

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  In the case of conventional multi-cylinder planetary rolling, as mentioned at the beginning, the horizontal component of the resultant forces acting along the contact arc AB is directed in the opposite direction to that of the rolling, which has the effect this force must therefore be balanced by a pusher member which is generally a first "duo" ordinary cage placed in -amont of the sun gear with respect to the rolling direction and which imposes on the product to be rolled a law of displacement, said force being maximum at

  when the working cylinder comes into contact with the product.

  In the method according to the invention, the horizontal shape of the contact arc AB is such that this thrust force is minimal when the contact of the cylinder with the product 5 is established, which has effect of minimizing the stresses on the thrust member imposing the

  law of advancement of the product to be rolled.

  The device ensuring the displacement of the working rolls in an orbit 3 according to the invention is produced by combining eccentrics and connecting rods, three different embodiments of which

  are shown in Figures 2, 3 and 4 respectively.

  Figures 2 and 3 each illustrate a device designed to allow the working cylinder 1 to traverse its orbit 3 in totality

  in the same direction (direction indicated by the arrows).

  The device represented in FIG. 2 essentially consists, as can be seen, of three connecting rods 21, 22 and 23, of three

  eccentric 24, 25 and 26 and a connecting rod 27.

  Each connecting rod is articulated at one of its ends (respectively

  28, 29, 30) to an eccentric (24, 25, 26) The rod 21 is fixed at its other end to the axis 2 of the working cylinder 1 The other two rods 22, 23 form at their other end a pair rotating M and the rod 27 connects this movable point M to the axis 2 The three eccentric shafts rotate in the direction indicated by the arrows The rotational speeds are equal in absolute value, their ratios being maintained

  fixed, for example by means of gears not shown in the figure.

  One of the eccentrics is driven by a motor also not shown.

  Under these conditions, the axis 2 of the working roll travels the contact arc AB A to B by contacting the product at A, this point

  constituting a cusp (type O variant).

  The device shown in FIG. 3 comprises only two links 31, 32 and two eccentric members 33, 34. The connecting rod 31 is connected to the axis 39 2 of the working cylinder and is extended beyond its point.

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  35 on the eccentric 34 to a moving point N forming a pair with the connecting rod 32 at its end opposite that of its fastener 36 on the eccentric 33 The two eccentrics rotate in opposite directions, as the indicate the arrows, the remainder being unchanged with respect to the device described with reference to Figure 3. Under these conditions, the axis 2 of the cylinder 1 travels the working arc AB from A to B -by contacting the product in At this point

  constituting a point of inflection (-variante of type 3).

  The device shown in FIG. 4 is similar to that of FIG. 2. According to the same organization, there is a set of three connecting rods 41, 42, 43 and three eccentric members 44, 45, 46, a connecting rod 47 and the articulations 48, 49, 50 between the exentrics and the connecting rods, as well as the moving point M connecting the connecting rods 42, 43 and the

  rod 47 in a common rotation torque.

  However, unlike the device shown in FIG. 2, one of the eccentrics, in this case the eccentric 46 in the example shown, is driven in a reciprocating rotational movement less than one turn, by a fourth eccentric 51 with the aid of an additional connecting rod 52, the eccentric shaft 53 being rotated

continues by an engine.

  Under these conditions, the axis 2 of the working cylinder 1 travels the working arc AB alternately from A to B and B to A (rolling "up" in the latter case) and the cylinder remains permanently

in contact with the product to be laminated 5.

  Of course, the invention can not be limited to the examples described, but extends to multiple variants or equivalents to the extent that the characteristics stated in the

attached claims.

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Claims (4)

  1) A method of driving a planetary mill according to which the working roll (1) travels an orbit (3) over at least a portion (4) of which it comes into contact with the rolling product (5), characterized in that the rolling direction (V) of the product (5) is assumed to be horizontal, the movement of the cylinder (1) on said portion (4) is imparted with a horizontal "S" shaped trajectory limited by two points (A and B) where the tangents (T a and Tb) to the orbit (3) are   parallel to each other and to the rolling direction of the product (5).   2) Process according to claim 1 characterized in that the point (A or B) of the portion (4) o the cylinder (1) comes into contact with the product to be rolled (5) is a point of inflection of the orbit (3) moving said cylinder. 3) Method according to claim 1 characterized in that the point (A or B) of the portion (4) o the cylinder (1) comes into contact with the product to be rolled (5) is a cusp of the orbit ( 3) displacement of said cylinder.   4) Process according to claims 1 or 2 characterized in that the   portion of trajectory (4) has, between its two extreme points, (A and B), a point of inflection (1).   ) Method according to claim 2 characterized in that one prints at the cylinder (1) 9 at the time of its contact with the product to be rolled (5), a speed of rotation about its axis (2) equal or substantially equal to that which corresponds to the rolling conditions of the cylinder on the product being rolled.   6) Device for implementing the method according to claim 1 characterized in that it consists of a combination of eccentric and connecting rods which print to the axis (2) of the working cylinder (1) a displacement in the space in an orbit having a horizontal "S" -shaped portion of trajectory (4) limited by two   points (A and B) where the tangents to said orbit are parallel to each other   they and the direction of rolling of the product, the latter being assumed horizontal.