FR2621845A1 - WHEEL DRESSING DEVICE FOR GRINDING THE EDGES OF THE OUTER RING OF BEARINGS WITH CYLINDRICAL ROLLERS - Google Patents

Abstract

Grinding wheel dressing device, for grinding the edges of the outer ring of cylindrical roller bearings, using a front side dressing device, characterized in that parallel rods 3, 4 are arranged in housings 1, 2, rods which are produced, at their lower ends, in the form of pinions 5, 6, in that the pinions 5, 6 are engaged on racks 7, 8, 9, 10 capable of being moved linearly, the stroke of the linear movement being on this occasion liable to vary, by adjusting screws, in that the racks 7, 8, 9, 10 are capable of being moved pneumatically and that the diamonds to be dressed 13, 14 are clamped by screws 20 , 21, in the bores of the rods 3, 4.

Description

The invention relates to a dressing device

  of grinding wheels, for grinding the edges of the outer ring

  of cylindrical roller bearings.

  We know how to use grinding wheels to grind the edges of the outer rings of cylindrical roller bearings, grinding wheels which are a little wider than the distance between the edges to be machined. These grindstones are only rectified, before the start of work, to the distance between the edges and directly used in a submerged grinding process, for the machining of the two edges. The edges of the grindstone cause the removal of

  shavings, due to the fact that these edges are not ground

  kills only by transverse advance of the grinding wheel, therefore by plunge grinding, while the two front surfaces only flush the ground edges. After grinding

  two edges, the edges are worn.

  This results in two important facts: If a grinding wheel is used with a very precise width, it is sufficient to straighten it, as for a bore correction, in order to machine the next ring. The consumption of grinding discs influences the final result, by a small deviation from parallelism

  between the two edges. By this method, he is disadvantaged

  Tagous that the use of hard grinding wheels at low feed rates and special coolants are necessary, to reduce consumption

in grinding wheel discs.

  It is also known to use grinding wheels specially made for grinding the edges. These special grinding wheels have an outer crown with a narrower width than the distance between the edges, on the workpiece. The next part of the grinding wheel is in clearance, over a markedly more limited width. The two front sides of the outer ring grind the edge sides one after the other, with the help of corresponding technical means, and this

  method also has significant drawbacks.

  The manufacturing costs of these special wheels are very high. In addition, because of the internal core which is very narrow, the grinding wheels of this shape tend to vibrate, respectively to undergo certain bending, which influences in

  any case unfavorably on the quality of sur-

  face. The object of the invention is to create a dressing device, which does not make the use of special grinding wheels, subject to vibration, necessary for grinding the edges of the outer rings of cylindrical roller bearings. Starting from the represented faults of the state

  prior to the technique, the goal is to create a dispo-

  dressing sitive, with which cylindrical grinding wheels

  normal can be erected, for edge grinding.

  This problem is solved, according to the invention, as follows: A dressing device on two sides is used in a known manner, for machining the flat sides of the grinding wheel. The dressings are

  tightened by screws, in two parallel rods, available

  entered perpendicularly. The radial adjustment of the curved dressing tool must be carried out in such a way that a certain distance is respected, between the center of the rod and the front surface of the grinding wheel. Adjustment

  is carried out by threaded pins provided for this purpose.

  There is also an adjustment for a dressing tool, in order to be able to mutually adapt the spacing of the diamond points to be dressed, to the spacing of the edges of

  the workpiece, not machined. We take into account this-

  occasion of a safety gauge which one can choose according to the side. An axial adjustment and a radial adjustment of the device are also provided. When dressing a new cylindrical grinding wheel, each side must be able to be oriented in the engaged position of the tool to be dressed, with automatic feed, when

  tilting movement, this before the start of the process

  complete training. On reaching the pre-selected end position of the approach device, the tools to

  dresser perform the circular tilting movement

  laire, to realize the skin of the sides of grinding wheels. For this purpose, the parallel rods are produced in the form of a pinion, at their lower end. These gables

  engage in hydra displaced racks

  linearly, the stroke of the linear movement can then be limited by adjusting screws. The tilting angle of the diamonds to be cut is simultaneously defined by the limitation of the

linear movement.

  The length of the diamonds to be dressed must be chosen according to the diameter of the grinding wheels, so that the pivot radius of the diamond point to be dressed guarantees perfect and sufficient draft

de-la meule.

  The elbow alignment is advantageously carried out according to each piece of work, the machining edges of the front sides being able to be exactly aligned on this occasion, when approaching the device. Alignment

  elbow which can however be carried out under the conditions

  grinding, such as an intermediate dressing, or

  well after every nth workpiece.

  An embodiment of the object of the invention

  tion is shown by way of non-limiting example in

attached drawing.

  Figs. la, lb are front views, in section.

  Ies fig. 2a, 2b are sections through the drive unit for the curved movement of the diamonds to be dressed. Fig. 3 is a top view of the diamonds to be cut. Fig. 4 is one of the grinding wheels produced thanks to the

  device according to the invention, clamped in the spindle.

  According to fig. 1, it is shown that rods 3; 4 parallel are arranged in casings 1; 2, rods which are produced, at their lower ends, in the form of pinions 5; 6. The pinions are engaged on racks 7,8,9,10 displaced linearly, the stroke of the linear movement being able on this occasion to vary, by adjusting screws 11; 12, in FIG. 2. The angle of

  tilting of the diamonds to be cut 13; 14 is simultaneous-

  ment defined by the limitation of linear motion.

  The racking of the racks 7; 8; 9; 10 is effected by means of an alternative pneumatic stress, by

  the connections 15; 16; 17; 18, according to FIG. 2.

  The size of the radius R, and thus the size of the draft, are chosen according to FIG. 3, depending on the size of the workpiece and the grinding wheel 19. The adjustment is made by loosening the screws 20; 21 and consecutive displacement of the diamonds to be cut 13; 14, in

the bores of the rods 3; 4.

  There is not shown a possibility known per se of axial adjustment of a dressing tool, in order to be able to mutually adapt the spacing of the diamond points to be dressed, to the edge spacing of the workpiece, not machined, ensuring that there is a corresponding safety clearance. An axial adjustment and a radial adjustment of the device are also provided, in a known manner. When dressing a new cylindrical wheel, each side must be able to be oriented in the engaged position of the tool to be dressed, with automatic feed, during the tilting movement, this before the start of the complete dressing process. By reaching

  the preselected end position of the filling device

  che, the tools to be dressed carry out the circular tilting movement, to carry out the skinning of

sides of grinding wheels.

  The advantage of using the solution according to

  the invention lies in the fact that cylindrical wheels

  that normal can be used for grinding the edges of the outer rings of roller bearings - cylindrical. This results in significant savings in terms of price and the grinding wheels have a significantly higher rigidity, which also positively influences the results of the work carried out.

Claims (2)

  1. Dressing device for grinding wheels, for grinding the edges of the outer ring of rolling bearings   cylindrical rollers, using a straightening device   wise from the front sides, characterized in that parallel rods (3; 4) are arranged in housings (1; 2),   rods which are made, at their lower ends   res, in the form of pinions (5; 6), in that the pinions (5; 6) are engaged on racks (7; 8; 9; 10) capable of being displaced in a linear fashion, the stroke of the movement linear being on this occasion liable to vary, by adjusting screws (11; 12), in that the racks (7; 8; 9; 10) are susceptible of being pneumatically displaced and that the diamonds to be dressed (13; 14) are tightened by screws (20; 21), in rod bores (3; 4).   2. Dressing device according to claim 1, characterized in that the size of the radius R, and thus the size of the draft, can be freely chosen, depending on the size of the part to be machine and grinding wheel (19).