Forging

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  • Topic: Ball bearing, Rolling-element bearing, Interior
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  • Published : May 19, 2013
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THIRD HOMEWORK OF ME112
TAYLAN ACAR – S000492
OZYEGIN UNIVERSITY – MECHANICAL ENGINEERING
April/12/2011
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Q1) BALL BEARING

Fig.1
As you see from the figure1, a classical ball bearing has got these parts: * Outer Race
* Inner Race
* Retainer(s) (sometimes two cages)
* Balls
* Shield
A classical ball bearing is made generally out of ceramics, carbide and used for saving power which has to be given to a mile or a shaft. First of all a ring nuts comes and is applied turning process, in order to get two races from a nut. After this, they are sent to a grinding machine both control the diameters and give the true roughness on the surface. Then, another machine polishes the inner and outer surface of these rings and hereupon, they are washed with kerosene and purified from chips and oil. The second part of bearings is making balls. The technique is bulk deformation. The short carbide bars come in to an impression die forging machine and get the main desired shape; however, the balls have got some flashes, as it is possible to see in the figure two. After that the balls are transmitted to furnaces; in order to being more durable. Moreover, the flashes are taken by grinding machine and they are look like in the figure 2. They do not use turning machine to take the flashes on the balls because you need labor and it takes longer time with turning.

fig.2

fig.3

The third part is penetrating balls between the turned, milled and drilled two cages. The first one comes with the inner and outer rings and balls penetrated inside of it; in addition, some grease is added in side of the bearings and it covers with a shield. Now it is ready for use, as it can be seen from the figure 4.

Fig.4

Q2) FORGING OPERATIONS:
fig.5
To manufacture like this parts flashless forging method (fig.6) should be used to make its down side. Then, an extrusion (fig.7) should be made for the tube part. After...
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