Method for achieving uniformly high strength values ​​within Nipkow disks by means of rolling and sheet metal disk for carrying out the method

Description

[0001] Method for achieving uniform strength width within Nipkow disks by rolling and sheet metal disk for carrying out the Method The invention relates to the manufacture of sheet metal discs, such as those used for N-Tipkow discs in television, and is based on The realization that today's technology for manufacturing Nipkow discs requires sheet metal discs, and the requirements that which could not be satisfied so far.

[0002] These requirements consist in the fact that the sheets used as Tipkow discs have certain strength properties. properties that could not be achieved using the manufacturing processes previously employed. The properties achieved with the invention The goal is to ensure that the sheet metal elements equidistant from a fixed point are as similar and identical as possible. exhibit strength values ​​(including elongation values), indicating a radially symmetrical strength distribution. While in the In known manufacturing processes for sheet metal, the strength of the sheet metal in one direction (for example, in the rolling direction) Since the strength is significantly different from that in the perpendicular direction, the task is therefore to make the strength as uniform as possible in all directions. hold. The use of such sheets is of particular importance in the manufacture of Tipkow disks, which are used for scanning images in These discs, which are generally circular, are cut at high speed during The rotation of the machine, for example 6000 revolutions per minute, shows uneven deformations during operation, which it making it impossible, given the small probe hole diameters produced in the disk's resting state, to reduce distortion to keep sufficiently small during scanning and playback.

[0003] The invention relates to the application of a very specific rolling process to achieve consistently high strength values ​​within @Tipkow disks during their manufacture by rolling, and a method is to be used for this specific purpose according to the invention. to be used in the discs, which have already been pre-processed to almost final thickness, are rotated in different directions with partial rotation of the discs during constant angle of rotation between each pair of rolling passes to final dimensions = rolled out. It is already known to produce To allow the rolling of stretchable and smooth thin sheets in various directions. The individual sheets are thereby... successive rolling passes arranged alternately in intersecting directions, with a reduction in sheet thickness at each step. The rolling process is brought about. Compared to these known methods, according to the invention, a significant change in the sheet thickness should no longer occur. The process does not take place, but the sheet metal disc already possesses approximately its final thickness before the rolling process begins.

[0004] On the other hand, it is known to harden the surface of heavily stressed workpieces by so-called surface pressing. In the The invention relates to thin sheets of metal, and the aim is not to harden the surface of the sheet, but rather to make it Hardening occurs across the entire cross-section of the sheet metal and flat in all directions, such that the strength with respect to The center point is as uniform as possible in all directions. Therefore, the essential point regarding your invention, compared to your acquaintance, is that it involves... a process for processing sheet metal for ipkow discs and that a sheet metal disc of approximately the final thickness is subjected to rolling process 3. By the application of such a process for the production of N as proposed in the invention. The advantageous strength distribution required for such discs is achieved with ipkow discs, whereby it is noteworthy that the sheet metal disc in the The thickness of the various rolling passes is not significantly affected. The workpiece is rotated by the [missing information] between each rolling pass. rotated at the same angle.

[0005] According to a further aspect of the invention, the rolling direction can also be changed uniformly during each rolling step, However, this is not absolutely necessary.

[0006] It is advantageous to offset the different rolling passes by only a small amount. Furthermore, it is advantageous to The angle by which the workpiece thickness is rotated between the individual rolling passes should be chosen so that the desired end product is at least after one full revolution with respect to the rolling direction (i.e., after 360° or 2 ;r), meaning that the rolling direction is reached at the first and last The rolling process is the same. It is particularly advantageous to carry out the individual rolling passes in such a way that the @-\"erkstüclc is between your first and your The last rolling pass undergoes partial rotations, which together amount to an integer multiple V#->n 360e.

[0007] It is also advantageous to make the sheet metal disc, which is to be produced for the nipple disc, either circular or regularly multiplied, especially square, and in the rolling direction much larger than the workpiece to be cut from it, for example in the case of a The desired disc diameter is 50 cm, ideally 100 cm in diameter. It is definitely advantageous in this case as well. Ideally, circular starting sheets should be used, from which the desired cutout is symmetrically produced.

[0008] The method according to the invention will now be described with reference to Figures i to 7. Figures i to 3 show, for example, the material to be rolled. Sheet metal disc for the ipkow disc. The dashed circle in the middle of the illustrations is meant to indicate the disc to be produced, and it follows from this This is evident because the sheet metal disc being processed is significantly larger than the finished workpiece. In Figs. 1 to 1, the directions of the individual The rolling passes are shown, specifically nine rolling directions are depicted; the tenth corresponds to the initial rolling direction. In these cases, therefore... After one full revolution (= z) with respect to the rolling direction, the initial position is reached again. Fig. 4 shows the case of a change in the rolling direction. after each rolling pass, and Figures 5 to 7 show examples of the continuous change in rolling direction during the rolling pass, namely in the In the first case, the rolling direction is always straight, while in Figures 5 to 7 it changes according to the drawn curves. As already mentioned above, by appropriately selecting the angle between the individual rolling directions, the initial position can be determined only after several revolutions (i.e., T, 6 T, 8 :r etc.) can be achieved, which is particularly useful for achieving a sheet with a vertical vininetric strength distribution.

[0009] Advantageously, the workpiece is rolled under the steam hammer and then, for example, by a leveling press in its The strength is reduced to such an extent that the rolling process can no longer cause any significant changes to the material structure. This is naturally The rolling process may still have a certain influence on the shape, so that the uniformity of the <V'erlcstoffes in allen Richtungen is guaranteed.

Claims

[0010] PATENT CLAIMS: i. Method for achieving uniformly high strength values ​​within Nipkow disks during their manufacture by rolling, characterized in that the discs, which have already been pre-processed to approximately their final thickness, are rolled in different directions. The discs are rolled to their final dimensions by partial rotation at a constant angle of rotation between each pair of rolling passes.

2. Method according to Claim i, characterized in that the folding direction is changed uniformly during each rolling pass.

3. Method according to claim 1 i or 2, characterized in that the rolling direction is the same for the first and last rolling passes.

4. Method according to one of the preceding Claims. characterized in that the partial rotations which the workpiece undergoes between the first and last rolling pass are together an integer multiple of 36°.

3. Sheet metal disc for carrying out the method according to one of the preceding claims, wherein characterized by the fact that it is larger than the workpiece to be cut from it.