FR2510438A1 - METHOD OF MANUFACTURING SHEET CAGES FOR ROLLING BEARINGS - Google Patents

Abstract

THE INVENTION RELATES TO A METHOD OF MANUFACTURING SHEET CAGES FOR ROLLING BEARINGS, ACCORDING TO WHICH THE HOUSINGS FOR ROLLING ELEMENTS ARE PUNCHED AFTER A SHEET OF SHEET HAS BEEN BENT IN THE FORM OF A RING AND WELDED TO THEIR END. FOR PUNCHING, THE PUNCH DOES NOT MEET THE WELDING CORDS, AND TO OBTAIN MORE SHORT WELDINGS, THE FREE SIDES OF THE SHEET METAL HAVE NOTCHES SO THAT ONLY NARROW ENDS ARE WELDED. TOGETHER.

Description

2 5 1 0 4 3 8

  Method of manufacturing t-shaped cages for rolling bearings

  the present invention relates to a method of manufacturing

  cation of tale cages for rolling bearings, which essentially consists in cutting a strip to length

  of sheet metal, to bend the strip of ttele into a ring, to assemble

  b Ler The free end by welding or the like, and at

  punch the housings for the rolling elements.

  In addition to the methods in which the housings for the rolled elements are already stamped in the strip of the flat plane, methods of the aforementioned type are also known. Among the methods mentioned first, it should be noted for example those described in the Patents

US 33 65 775 and DE-GM 7 321 195.

  US Patent 3,365,775 describes a method where the weld line is in the region of a rolling element housing, so that significantly shorter weld beads are sufficient on the narrow side rings in the region of the housing of a rolling element But this is a process in which the housings for the rolling elements are punched before

  welding the ends of the ring It can therefore appear

  experience inaccuracies in positioning and bias

  cu Smoothly in the dimensions of the Element housing

  rolling which is in the area of the line of under-

  tough. , the cage described in DE GM 73 22 195 is manufactured in a similar manner The weld bead is located in the region of a rolling element housing and therefore extends only over the width of the rings

  Lateral so that, among other things, the support cord

  hard does not protrude into the element housing

  rolling, the angles of the free ends of the rings la-

are chamfered.

  It is also known to only punch the housings for the rolling elements after the ends of the strip wound in a ring have been welded.

  true that this order of operations brings some advantages

  tages with regard to the accuracy of the distribution and dimensions of the housings for the rolling elements as well as for the inclination of the guide surfaces of the sleepers for the rolling elements, but a problem appears when the punching tool meets the welding The latter is hindered in a way harder and

  more rigid than the rest of the tb Le, so that Le poin-

  lesson may be damaged and destroyed prematurely-

  ment For this reason, the punching operation is generally carried out in such a way that the weld bead remains intact and is located between two housings of rolling elements, therefore on a cross member. But under these conditions, the weld extends over the entire width. The cage, which requires more work and material The object of the invention is therefore to propose a method of manufacturing a bearing cage, according to which the welds are

  short, according to which the punch does not meet the

  lasts and according to which what remains of the weld does

  not protruding into the housings of sliding elements The

  vention also relates to a manufactured bearing cage

according to this process.

  This result is obtained by the fact that at the time of the cutting to length of the head strip, or after, notches are formed at the two ends, in the region of the line which laterally limits the subsequent housings.

  for rolling elements, these notches opening at the ex-

  free hoppers, and that at the time of the pointering of the housings of rolling elements, one of these housings is formed

  in the region of the assembly position.

  These housings can be formed with advantage at the two free ends at the same time as the cutting or the cutting to length of the sheet metal strip, and have for example a rectangular shape whose dimension is half of the future window The dimension in the direction the width of the ring is chosen just large enough

3 2510438

  so that there are sufficiently wide bands and that

  sufficient strength is ensured after welding.

  In any case, this dimension must be greater than the

  width of the rolling element housings which will be

  subsequently designed so that the punching tool used for this purpose cannot touch the weld and only

  moreover, what remains of the weld cannot touch the element.

  rolling dimension The size of the notches according to the circum-

  cage ference must be reduced enough for

  the edges of these notches are located inside the housing

  ment of rolling element subsequently stamped, and for

  be eliminated during this punching operation.

  The strip of t 8 Le with the notches at its free ends

  is then bent to form a ring and the narrow ex-

  free hoppers are joined by their end faces

  and welded together In another operation, the housings

  the rolling elements are punched in the ring at the corresponding intervals This operation begins

  for example in the region of the weld and the ring is po-

  positioned so that the first housing covers the

  cutting the window in the circumferential direction.

  In this way, the guide surfaces of the rolling element

  lant are also formed in the region of your weld

  by punching the housing, which preserves the w

  process steps, although the weld bead is short

  and is located in the region of a rolling element housing.

  The guide surfaces of the rolling element in the direction

  The circumferential position of the cage is also formed by punching the housing. Only a small part is lost in the region of the weld, by the machining of

the window.

  Another feature, one of the

  rolling element is arranged symmetrically by

  relative to the center line of the window formed after the as-

  appearance of the free ends of the t 8 le strip.

  The narrow notch resulting from the window, in the region of the weld bead and which remains after the punching of the rolling element housing is located

  thus exactly in the middle of the corresponding housing, ap-

  thus bringing the advantage of symmetry for the contact

of the rolling element.

  In another embodiment, the window of a cage manufactured by the method of the invention has rounded angles. Thus, there can possibly not be a notch effect in the case of an extreme load of the cage, no crack due to welding stress

and cooling.

  In another variant, two circular cutouts are provided, arranged one at a time from the other in the direction of the width of the cam. This arrangement is advantageous when the strip of cut is cut to length from a band Circular cutouts can be punched with an easy tool

  to be made and are arranged so that they are each

  cun about half, in the direction of the width of the sheet metal strip, on the edge of the rolling element housing subsequently punched At the cutting point

  at length, the cutting edge passes through the center of the

  circular cuts This results after the curvature in

  a ring and welding two circular cutouts, the sou-

  hard being made only in the region of the lateral rings.

  2 After the punching of the housing of rolling elements, the desired semicircular notches remain in the

weld bead region.

  Other features and benefits of In-

  vention will appear during the description which goes

  follow several examples of implementation and refer to it

  rant to the accompanying drawings in which Lies Figures la to id illustrate the various operations of the manufacturing process of a sheet metal cage and

  Figure 2 shows a cage with cutouts

  circular pages, before punching the housing of the

rolling elements.

  The strip of t 8 Le 1 shown in Figure la

  is stamped in a flat or cut raw material

  framed in a strip of t 8 le During this operation,

  notches 2 are formed simultaneously at the two ends

  mites, so that there remain narrow edges of a corresponding width for a subsequent assembly operation.

  The dimensions of the notches will be explained below.

  after for a better understanding As shown in Figure lb, during a following operation, the sheet metal strip 1 is bent into a ring 4 so as to form

  an assembly position 6 between the free ends 5.

  In this assembly position 6, the free ends of the sheet metal strip 1 bear against each other

  by their edges 3, as it appears in Figure lc.

  This results in a window cutting 7 The free ends 5 of the strip of t 8 le 1 are assembled for example by resistance welding, along the edges 3 During another operation, and as shown in FIG. 1b,

  R housings for rolling elements are punch-

  born in the closed ring 4 These housings are arranged so that one of them is roughly symmetrical

  relative to the center line of window 7 already existing

  aunt In the direction of the width of the ring, the

  cutting in window 7 is larger than the housings 8 of the rolling elements so that the weld beads 9 which start with a slight offset with respect to these

  cannot be touched by the punch tool -

  swims In the circumferential direction of the ring 4, the housings 8 of the rolling elements are wider than the relatively narrow window 7, so that it

  results in this position, a housing P of rolling element

  lant exactly dimensioned, whose dimensions correspond

  correspond exactly to those of the punch The housing R re-

  presented is intended for a cylindrical roller Les sur-

  bearing faces 10 on the lateral rings are slightly reduced by the small notches which remain from the

  window 7, so that the support conditions of the rollers

  the cylinders are hardly changed.

  Remains of protruding weld beads cannot come into contact with the side surfaces of the cylindrical rollers and therefore do not have to be removed

  so no further action is required.

  The notches, and therefore window 7, can be

  relatively narrow It suffices that the welds 9

  begin with an offset from the end faces

  tees of cylindrical rollers In the figures, the

  checkmarks 2 and window 7 have been represented with a lar-

  exaggerated gor for better understanding.

  Figure 2 shows a cage for a spherical bearing for which, at the time of cutting to length, the r> ande of t 6 le 1 has received semicircular lh notches made by means of a simple round punch and which , as

  shown, forms circular cutouts 12 after the as-

  fitting and welding of the free ends 5 of the ring 4 As shown in dotted lines, the housings 8 for the rolling elements are punched so

  about halfway through, a semi-notch

  circular, by which the weld bead is offset.

  The inner parts 13 of the tble, which are not as-

  seem to each other, are eliminated by punching.

  Your cages which are shown in the figures are only examples. The process which has been described and illustrated is also suitable for cages of other types of bearings, such as ball bearings, taper roller bearings, needle bearings, etc.

Claims (4)

  1 A method of manufacturing metal cages for rolling bearings, consisting essentially of cutting a strip of t 8 to length (1), bending the   strip of cable (1) in a ring (4), to assemble the ends   free mites (5) by welding or the like, and to be punched   the housings (8) for the rolling elements, process ca-   characterized in that, at the time of cutting to length the strip of tble (1), or after, notches (2) opening out   towards the free ends (5) are formed at the two ends   mites, in the region of the line which laterally limits a housing (8) of rolling elurlent formed subsequently, and that, when punching the housing (8) of rolling elements,   one of these dwellings is formed in the region of the posi- assembly (6).   2 Bearing cage manufactured according to the procedure   die of claim 1, characterized in that one of   housings (8) for the rolling elements is arranged sy-   metrically to the center line of the window cutout (7) formed after joining the ends   free (5) of the band of t 8 le (1).   3 bearing cage manufactured according to the method of claim 1, characterized in that the cutting   in window (7) has rounded corners.   4 Bearing cage produced according to the procedure   die of claim 1, characterized in that it comprises   carries two cutouts (12) of circular shape, arranged one next to the other in the direction of the width of ring.