FR2559696A1 - PROCESS FOR THE CONTINUOUS PRODUCTION OF PROFILE METAL BANDS, AND INSTALLATION FOR CARRYING OUT THE PROCESS - Google Patents

Abstract

A.PROCESS FOR THE CONTINUOUS MANUFACTURING OF PROFILED METAL STRIPS, AND INSTALLATION FOR THE IMPLEMENTATION OF THE PROCESS. B. PROCESS CHARACTERIZED IN THAT THIS SHAPING WITH CHIP PRODUCTION IS CARRIED OUT BY MILLING 13 OF THE BAND 12 AT A THICKNESS OF THE BAND REDUCED IN RELATION TO THE START THICKNESS, IN AT LEAST ONE ZONE AND IMMEDIATELY AFTER , AND ALWAYS IN THE SAME PASS, THE SURFACE OF THE ZONE OF REDUCED THICKNESS IS SOFTENED BY SCRAPING OR PLANING 15, 16. C. THE INVENTION RELATES TO A PROCESS FOR THE CONTINUOUS MANUFACTURING OF PROFILED METAL STRIPS, AND THE INSTALLATION FOR THE IMPLEMENTATION OF THIS PROCESS.

Description

1.- "Process for the continuous manufacture of metal strips

  sections and installation for the implementation of the process. "

  The present invention relates to a process for the continuous production of profiled metal strips with

  least two areas of different thicknesses

  cross section), from a thick strip

  uniform or almost uniform, by shaping with

  chips, the belt being moved under prestressing

  fixed tools for formatting.

  For many application cases, for example

  raw material for coating boards, or

  For contact elements in electrical and electronic technology, conductive metal strips having one or more zones of different thicknesses are required. If it is a thicker zone and thinner area respectively at the ends of the metal strip, then as a rule, the thicker part is used in the case of contact elements for the electrical connection,

  while the thinner zone, possibly after a

  appropriate training, serves to ensure proper contact

  said with respect to a corresponding counterpart.

  The manufacture of profiled metal strips as a starting material for such contact elements has so far been varied. The known rolling methods have the disadvantage of being limited to specific shapes and above all of requiring a complex tooling. It is added that the pieces made by

  a rolling process do not have the required tolerances

  and, in addition, the quality of their surface leaves room for

(DE-OS 28 36 475).

  The obtaining of the profiling by milling on the metal strips, although known, obviously also could not

  win. Milling processes are considered as

  time-consuming and chip shaping has been criticized as unfavorable (DE-AS

- 10 26 47 407).

  The methods known up to now (DE-AS 26 47 407, German Offenlegungsschrift No. 28 36 475) consequently consist in carrying out the removal of the material in the intended part of the strip by drawing or by planing. Amongst other things, attempts have been made to avoid chattering in this case by guiding the metal strip through the drawing device in order to increase the angle of attack on a curved surface. . Also, to avoid embrittlement of the material, the machining of the prestressed metal strip must be

  expected to remain below the yield strength.

  Regardless of what, in the case of a kidnapping

  greater volume to achieve a particular profile.

  to link, more passes are required

  cutting or planing, the strips produced according to the

  known or the semi-finished products or products obtained from these bands by cutting, by slitting or by stamping, do not reach the surface quality which must be

  be ensured, for example, on contacts deemed to be

to receive a gilding.

  The object of the invention is therefore to find a possibility of obtaining a better surface quality with

  a rational manufacture of profiled metal strips.

  This object is achieved, in accordance with the invention,

  what this rise in shape with chip production, makes

  kills by milling the web, at a reduced web thickness of 3.- compared to the starting thickness, in at least one area and immediately thereafter, and always in the same pass,

  the area of the area of reduced thickness is softened by

  clage or planing. This combination of the steps of the process taking place immediately one after the other, makes possible a

  sufficient removal of material in a single pass.

  As a result, a significant saving in manufacturing time can be achieved. Thanks to the mutual cooperation of the various machining tools which almost ensure a mutual guidance of the metal strip, the maintenance of the manufacturing tolerance determined, even within narrow limits, is

  no problem. The surface quality obtained thanks to the inven-

  tion allows the deposition of layers of noble metal

  thin, for example electrolytically, so that during the subsequent treatment, for example to obtain elements of electrical contacts, we obtain a significant economy of noble metals, such as gold, silver, platinum, etc. ...

  It is essential for the implementation of the invention

  that the quantities of material removed by milling are a multiple of the amount of material removed by scraping or planing. This means that the actual profiling, for example the recess of a longitudinal groove or the removal of the material from the strip on one or two sides in the edge zone, is carried out by means of the milling process. roughness of the surface as well as

  the final dimensioning of the metal strip is

  by the process of scraping or planing finishing the machining.

  It is also crucial for the precision of the di-

  the size and quality of the profiled metal strip

  obtain, that the thickness of the chip removed by scraping or

  age and which determines the quantity of material, is

  depending on the amount of material removed by the process

  milling applied upstream. This layer, fixed by 4. Example at a thickness of 0.01 to 0.02 mm may also, according to another concept of the invention, be removed in two or more scraping or planing passes succeeding and accompanying the milling process. For example, it is possible for a desired removal of 0.02 mm to obtain, after the milling process for profiling, the final dimensions of the belt and its final quality in two successive removal passes. 0.01 mm respectively

of material.

  For certain alloys, especially for those with high elastic characteristics, r- special guiding

  band can also facilitate the process of

  tion. In such cases, it has proved to be advantageous, according to a further embodiment of the invention, for the metal strip profiled by milling and softened by scraping or planing in the countersunk areas, to be cut out before milling. Devices

  for example of metal or plastic material

  of a particular conformation, are suitable for this purpose.

  Most of the conformation of the metal strip,

  in the sense of a profiling, is produced according to the invention, and -

  the difference of currently conventional techniques, not

  by planing, but by milling. Only for the improvement

  the surface of a scraping or planing process

  is further provided afterwards in the same operative pass.

  As a result, the amount of material, by volume, which is removed by milling and that which is removed by planing, are all decisive. According to the invention, the amount of material removed by milling must, in all cases, be

  a multiple of the amount of material removed by planing.

  Depending on the type of profiling, and the material used, such as CuZn, CuNi or CuPe, the thickness of the milled layer may advantageously be, for example, ten times, twenty times, or fifty times that of the layer removed by planing. ,

or even more.

  It has furthermore been found advantageous for the invention that the metal strip, which may be cut and subsequently milled, is softened with removal of chips during

  a deviation, for example during its guidance on a wheel

  water or a cylinder. This makes it possible to increase the angle of attack simultaneously with a transverse bulge

more reduced on the finished product.

  As already explained, it is intended for

  vention that the metal strip during its machining

  one after another in a single pass, the different

  machining For the implementation of the method according to

  the invention, it has accordingly been found to be particularly

  advantageously, an installation in which a

  stationary milling machine and one or more fixed

  scraping or planing, are arranged one behind the other

  very in the direction of movement of the band. A treaty-

  optimum effect and a reciprocal action in favor of quality

of the band are thus obtained.

  For shaping by removal of aluminum chips

  particularly hard copper bonds, for example in

  elastic qualities, it may be provided for

  part of the strip upstream of the milling device, a planing device. This arrangement has proved advantageous especially for thicker metal strips.

  The invention will be explained in more detail by referring to

  Embodiments of the embodiments shown in the figures

1 st 7.

  Figures 1 to 4 show cross sections of metal strips, for example based on copper alloys,

  in accordance with the invention. While in the

  1, between the edge regions 1 of the same volume remaining, a median recess 2, extending axially, is milled from the strip and then the surface thus milled is scraped, the recess 3 is located according to Figure 2,

  between border areas 4 and 5 of different volumes.

  FIG. 3 shows a strip, with, on one side only, a milled strip portion 6, which is inclined with respect to the surface of the residual portion 7. The reference 6 designates the initial portion of the strip having undergone neither scraping nor milling. Finally, FIG. 4 shows a section

  transversal band constituting another form of

  of the invention, and the remaining median zone 9 of the

  which, are connected zones 10 or 11 machined until

edge of the band.

  Figures 5 to 7 show the way in which

  lation of the profiled metal strips represented on the

Figures 1 to 4.

  The metal strip 12 according to FIG.

  For example, a CuZn alloy is extracted from a reactor.

  serve as a band not represented and brought in the direction of the

  arrow to the milling device 13 indicated schematically.

  The cylindrical cutter used in this case removes with

  chip production a portion 14 extending in the direction

  of the strip, for example a thickness of 0.18 mm naked par-

  firing of the metal strip 12 having a thickness of 0.5 mm.

  The scraping or planing device 15, indicated schematically

  The cutting or scraping knife 16 of this device removes, as shown, from the surface of the milled portion of the web, a chip of a thickness of 0.01 mm. This has the consequence that the milled surface is softened, that is to say rid of all traces of milling. At the same time, because of the engagement of the scraper blade 16, the milling process is stabilized.

  in its course so that manufacturing tolerances

  narrowing can be maintained.

  In contrast to the above, FIG. 6 shows a production method in which a strip 18, made up for example of copper, with a width of 60 minutes and a thickness of 1.3 minutes, is provided. a median recess

  for example according to Figure 1, with a depth of 0.8 mm.

  To achieve it we use the cylindrical milling cutter 20 which de-

  pledge first in the band 18 a recess 21 of deep

  for example, 0.78 mm. Immediately after this recess

  21 is softened, by means of the plane 22, by removal of a

  skin 23 of about 0.02 mm thick in its middle part, the recess 19 being then brought by simultaneous beveling of its two side edges 24 to its shape and its dimensions

final.

  The two planes 25 and 26 mounted hereafter have the function of only removing a possible burr on the edges, of course, other known means, such as

  grinding discs, brushes, etc., can also

  be implemented for this purpose.

  Finally, FIG. 7 shows the production of a band 27 made of copper-copper alloy, for example 66 mm wide and 1.3 μm thick, in which, in accordance with FIG.

  FIG. 4, a median zone 28 of, for example, 27 -m must remain

  b. The thickness of the border zones 29 to be produced must

for example, 0.4 mm.

  For this purpose, the two milling cutters are

  30 and 31 which at the time of the draw of band 27 in

  the direction of the arrow realize the recesses 32 and 33 extend

  in the direction of the web at a height of about 0.9 mm. To soften the surfaces of these recesses, the planing device 34 is provided which removes the parts 35 and 36 to a thickness of about 0.02 minutes and which ensures

  possibly at the same time a bevelling of the zones of bor-

  lasts 37. The remaining burrs possibly on the -median zone during these bases of work can be; as indicated, remove using planes 8 and 39 or other

appropriate means.

  A comparison of the manufacturing methods according to the exemplary embodiments of FIGS. 5 to 7 indicates for the quantities of material removed by milling and by planing,

  ratios of about 18: 1, 39: 1 and 45: 1.

255969.6

  8.- Instead of the cylindrical burs used in the exemplary embodiments shown,

  can of course also use border strawberries

  or other appropriate milling devices.

  It is, on the other hand, decisive for the invention that the profile is produced by a milling process while the lissaae thus cranes the terminal dimensions.

  and quality are obtained by scraping or planing ter-

minal. 9.

Claims (10)

REVENUE FROM CATI ONS   1. A process for the continuous production of profiled metal strips with at least two zones of different thickness dimensions (cross-sectional dimensions), from a strip of uniform or nearly uniform thickness, by   shaping with chip production, the tape being de-   placed under prestressing in front of fixed shaping tools, characterized in that shaping with chip production is performed by milling (13) the web (12) at a reduced web thickness with respect to starting thickness, in at least one zone and immediately thereafter,   and always in the same pass, the surface of the thick zone   The reduced size is softened by scraping or planing (152-16).   2. A process according to claim 1, characterized in that the amount of material removed by milling is a multiple of the amount of material removed by scraping or planing.   3. Process according to any one of the claims   1 or 2, characterized in that the thickness of the chip removed by scraping or planing and determining the amount of material removed, is fixed in a manner independent of the amount of   material removed by the milling process planned upstream.   4. A process according to claim 3, characterized in that the thickixixée for the chip is removed in two   or several raking or planing operations succeed each other   in the direction of moving the web.   5.- Method according to any one of the claims   1 to 4, characterized in that the metal strip profiled by   milling and softening by scraping or planing in   is removed before milling.   6. Process according to any one of the claims   1 to 5, characterized in that the band possibly disengaged   and then milled is softened with production of chips a deviation.   7.- Installation for the implementation of the process * -   according to any one of claims 1 to 6, characterized   characterized in that a fixed milling device and one or more fixed scoring or planing devices are arranged one behind the other in the moving direction of the band.   8. Installation according to claim 7, characterized   in that upstream of the milling device, provision is made   a planing device for the moving web.   9.- Installation according to claim 7, characterized   in that the milling device comprises a cylindrical milling cutter drique.   10.- Use of metal strips obtained   according to the method according to any of the claims   1 to 6, for the production of contact elements of a   surface quality allowing the coating.