Patent Application
20200188973
The invention relates to a cross-rolling mill according to the preamble of claim 1.
DE 3406841 discloses a three-roll cross-rolling mill with rolls having conical rolling surfaces and in which for adjusting the roll shafts, a pivotal movement about a respective axis can be carried out.
In other known cross-rolling arrangements, e.g., according to an Assel mill process, adjustment of a roll shaft can take place about two different axes.
Decoupling of transverse forces between contact surfaces produced by adjustment require use of intermediate elements which increases the height of the installation.
The object of the invention is a cross-rolling mill in which a low-friction adjustment of roll shafts becomes possible.
According to the invention, this object is achieved, for the above-mentioned cross-rolling mill by characterized features of claim 1. The pivotability of the rocker pin provides for a simple and low-friction position adjustment between the roll shaft and the control element which can take place in different directions.
The number of roll shafts can advantageously amount to two, three, and even four. In particular, the cross-rolling mill can operate according to the Assel mill process or method or at least a similar one.
The alignment of the roll axis about the adjustment axis means geometrical adjustment for purposes of the invention so that the adjustment axis should not have any bodily shaft or the like. Preferably, the adjustment axes can extend perpendicular to the roll axis, but also in particular perpendicular to one another. Within the meaning of the invention, any actuator with which a roll axis can be adjusted, may be considered as a control element. As an actuator, in particular, a hydraulic cylinder or an electromechanically actuator can be used. Generally, preferably, the actuator is so configured that the rolling force is applied to a workpiece.
In an advantageous embodiment of the invention, the roll shaft has, at the two opposite ends thereof, respectively, a rotary bearing and a pivotable rocker pin. In this way, the pivotable rocker pin provides a complete and low-friction support.
For providing a simple and effective construction, it is generally advantageous for the roll shaft to be received in a roll housing, with the roll housing being displaceably supported by rocker pins for pivotal movement about the adjustment axis. The roll housing can be formed as a rigid frame but displaceable relative to a stand.
In advantageous detail design, preferably a hydraulic tension element applies, to the roll housing, a force in a direction opposite the direction of the rolling force. Thereby, together with the forces of the control element, a totally play-free mounting of the roll in a respective position is achieved.
In an advantageous embodiment of the invention, a bearing cap is pivotably arranged against at least one end of the rocker pin. This insures a simple lateral displacement of the support point of the rocker pin or the bearing cap. In addition, the bearing cap can be replaced in a simple way as a wear part.
For a variable positioning, it is advantageously provided that the rocker pin is pivotable, starting from a neutral position, in each spatial direction by an angle about a pivot point.
Altogether, advantageously, at least two roll shafts, preferably, at least three roll shafts, particularly advantageously, all of the roll shafts of the cross-roll mill are adjustably supported according to one of the features described above.
Generally, the inventive mounting of a roll shaft or roll shafts provides for compensation of the radial movements relative to the adjustment axis. Similarly, compensation of angular deviations perpendicular to the adjustment becomes possible. In addition, the constructional height and, thereby, the frame size and weight of the cross-rolling mill are reduced by the invention.
The invention eliminates or reduces friction and transverse forces of the used components. A further advantage consists in an improved positioning accuracy under load. Further, the vibration behavior of the used system is improved, and the overall rigidity is increased.
Further advantages and features will become apparent from the following description of an embodiment example and dependent claims.
Below, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings.
The inventive cross-rolling mill which is shown in
In front of and behind the roll body 2, there are provided, respectively, rotary bearings 4, 5 which act against the rolling forces. The rotary bearings 4, 5 are received in a roll housing 6, with the roll housing 6 being displaceably supported relative to the frame 8 of the cross-rolling will by a bearing support 7. The roll housing is adjustably pivotable about first and second adjustment a first adjustment axis S1 and a second adjustment axis S2. The second adjustment axis S2 extends, as shown in
The roll housing 6 is formed as a rigid essentially yoke-shaped member. The roll housing 6 is supported at its two support regions 6a, on one hand, by the rotary bearings 4,5 and, on another hand, by respective intermediate members 9, 10. The intermediate members are arranged between the roll housing 6 or the rotary bearings 4, 5, on one hand, and, on the other hand, two respective control elements 11, 12, on another hand.
The roll shaft 1 is adjusted by alignment of the roll housing 6 and, thus, of the rotary bearings 4, 5, at that, the control elements 11, 12, which are formed as hydraulic cylinders, should be respectively positioned. The control elements 11, 12 can transmit rolling forces acting on a workpiece.
The roll housing 6 is pulled against the rolling force by a tension member 13 formed as a hydraulic cylinder, so that the roll housing 6 is always firmly pressed against the control elements. The force applied by the tension member is smaller than the force of the control elements, which insures a play-free positioning of the roll shaft 1 and provides for release of the workpiece.
The intermediate members 9, 10 are identical and serve for compensation of adjustment-generated tilting and offset movements between the control elements 11, 12, on one hand, and the roll housing 6 or the roll shaft 1, on the other hand. The intermediate members 9, 10 include, respectively, rocker pins 14, 15. The rocker pins 14, 15 are pivotable in several directions which is achieved by spherical support of the rocker pins 14, 15.
The rocker pins are provided, on their sides, facing the control elements, with a respective concave surface 14a, 15a, whereas the control elements are provided with corresponding convex spherical surfaces. On their sides facing the roll shaft, the rocker pins are likewise provided with concave spherical surfaces 14b, 15b.
At the ends of the rocker pins 14, 15, there are provided substantially semi-spherical bearing caps 16, 17. Those are pivotable by the spherical surfaces 14b, 15b relative to the rocker pins, with their plane opposite surfaces lying on the roll housing. Thereby, if necessary, a lateral offset of the opposite surfaces relative to the roll housing becomes possible.
It should be understood that in other embodiments reversely curved spherical surfaces can be provided, e.g., convex spherical surfaces on the rocker pins 14, 15 and correspondingly concave spherical surfaces on the control elements 11, 12 and/or the bearing caps 16, 17.
The adjustment of the roll housing about the adjustment axis S1 extending perpendicular to the drawing plane of
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2016 219 723.1 | Oct 2016 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2017/075784 | 10/10/2017 | WO | 00 |
