Methods and tools for the production of flat metal products.

Abstract

------02 / 06 / 2563------(OCR) The method for the production of flat metal products, especially coils of long sheets, in infinite and / or semi-infinite modes, in which the metal product is continuously fed to a roller rolling machine consisting of at least four platforms, which are, respectively, the roughing platforms (18a, 18b, 18c) and the finishing platforms (21a, 21b, 21c, 21d, 21e), where it is provided to carry out rapid gauge changes, i.e., changes in thickness without interruption of the rolling process, of the metal product leaving the roller rolling machine. At least the rotational speed of the rollers of the first platform (18a) of the roller rolling machine and its gap are not modified during the rapid gauge change of the long sheet. The change from the current thickness to the subsequent thickness is achieved by applying new settings of variables, for example, the gap between the rollers, the roller speed, and the tension between the platforms.With all the rolling platforms involved in the rapid gauge change, a number of platforms involved in the rapid gauge change, starting from the last platform (21e) of the rolling platform to finish, were obtained taking into account the distribution of the rolling force of each platform, so that the new distribution of the force due to the thickness change does not cause the value of the rolling force of any platform to fall outside the acceptable allowable tolerance range. ------------

Claims

------02 / 06 / 2020------(OCR)1. Method for the production of flat metal products, especially coils of long sheets, in infinite and / or semi-infinite modes, in which the metal product is continuously fed to a roller rolling machine consisting of at least four platforms, which are, respectively, the rough rolling platforms (18a, 18b, 18c) and the finishing rolling platforms (21a, 21b, 21c, 21d, 21e), in which it is provided to carry out rapid gauge changes, i.e., changes in thickness without interruption of the rolling process, of the metal product exiting the roller rolling machine, characterized by at least the rotational speed of the rollers of the first platform (18a) of the roller rolling machine and its gap not being altered during the rapid gauge change of the long sheets, i.e., the transition from the current thickness to the subsequent thickness is achieved by applying new settings of variables, for example, the gap between rollers, the roller speed and the tension between platforms.With regard to all rolling platforms involved in the rapid gauge change, and in nature a number of platforms involved in the rapid gauge change, starting from the last platform (21e) of the rolling platform to finish, are obtained taking into account the distribution of the rolling force of each platform, so that the new distribution of the force due to the thickness change does not cause the value of the rolling force of any platform to fall out of the acceptable allowable tolerance range.

2. The method as in claim 1, is characterized by the application of the rapid gauge change without altering the speed of the material fed to the rolling press.

3. The method as in claim 1 or 2, is characterized by the application of the resetting of the gap between the rollers, the speed of the rollers and the tension between the platforms involved in the rapid gauge change in the following manner:- First step in which a new target thickness and a new speed cone, i.e., a reference rotational speed for the working rollers of the rolling platform, are applied,And - the second step in which the tension between the new platforms is applied by means of a looper or tension adjuster.

4. The method as in claim 3, is characterized by the fact that when the cross-section of the long plate affected by the thickness change reaches a specific platform (platform number n), the gap of such platform is modified from the current gap to a new gap calculated to produce the subsequent thickness with the current tension between the platforms, and the platform speed is increased, or decreased, as a function of the new thickness to maintain the mass flow (thickness x speed) constant.

5. The method as in claim 4, is characterized by the fact that the tension between the platforms is modified only when the cross-section involved in the thickness change reaches the subsequent platform (n+1), and by the same time that the change in tension between the platforms, the gap and the speed of platform number n are adjusted, thus completing the transition to the new setup for platform number n.

6. The method as in claim 1 or 2,It is characterized by the change from the current thickness to the subsequent thickness occurring by applying the new setting to the relevant rolling platform, and the application of the new setting occurs simultaneously for all relevant platforms.

7. The method as in claim 6 is characterized by the fact that if there are more than two relevant platforms in the rapid gauge change, the variation of the setting is applied sequentially on the first platform and simultaneously on the last two or more platforms.

8. The method as in any of the preceding claims is characterized by the fact that all variations from the old setting to the new setting are handled in a ramping manner.

9. The method as in any of the preceding claims is characterized by the fact that in the case of a new distribution of the force for rolling due to the rapid change, it deflects from the acceptable allowable tolerance range.Then at least one new rolling platform positioned upstream of the one already provided shall be involved in the thickness change process.

10. Tools for the continuous production of flat metal products, which include at least one continuous casting machine (11) with a die (12), a rolling machine which includes rough rolling platforms (18a,18b,18c) and finishing rolling platforms (21a,21b,21c,21d and 21e), high-speed shearing machines (23) for cutting long strips to size, to be used in endless and / or semi-endless rolling to divide the long strips, attached to the rolling machine, into coils of the desired weight; and a pair of rolling machines (24a,24b), which have a control system suitable for applying methods for rapid gauge changes as in any one of claims 1 through 9.