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  • 标题:The influence of technological factors upon the accuracy and quality of the cold plastic deformation revolution surfaces.
  • 作者:Carausu, Constantin ; Pruteanu, Octavian ; Sarbu, Ionel
  • 期刊名称:Annals of DAAAM & Proceedings
  • 印刷版ISSN:1726-9679
  • 出版年度:2008
  • 期号:January
  • 语种:English
  • 出版社:DAAAM International Vienna
  • 摘要:The cold-working of the ball-bearing races'bed bearers, especially cyclical with balls and cyclical with cylindrical rollers, is actually an innovation for the bearing industry in Romania.

The influence of technological factors upon the accuracy and quality of the cold plastic deformation revolution surfaces.


Carausu, Constantin ; Pruteanu, Octavian ; Sarbu, Ionel 等


1. INTRODUCTION

The cold-working of the ball-bearing races'bed bearers, especially cyclical with balls and cyclical with cylindrical rollers, is actually an innovation for the bearing industry in Romania.

Experimental research has showed the way in which working parameters of special technological equipments have an influence upon the roughness and ovality, i.e. upon the quality parameters of surfaces processed by means of cold plastic deformation (Wagoner & Chenot, 2001), (Lupescu et all, 2004).

2. EXPERIMENTAL CONDITIONS

2.1 Material and half-finished

We have used for the experiment the steel 100Cr6, specially designed for ball-bearing races, which has a good cold-workability and hot-workability, as well as cutting workability. The blank was a ball-bearing race, which was hot-formed and processed by turning, boring and facing, until the dimensions of the blank corresponded to those established in the technical documentation of SC Rulmenti SA Barlad.

2.2 Working Equipment

For the cold-working of the outer races' bed bearers of the bearing 6207 we have used the Japanese equipment CRF-120 OR which allows the variation of the deformation force, P, of the deformation feed, A, and of the tool's rotation speed, V.

The working diagram is shown in fig. 1.

[FIGURE 1 OMITTED]

2.3 Instrumentation

The roughness of surfaces was measured with the device Taylor-Hobson, and the shape deviations with the device Perthometer Marsurf CD 120.

3. EXPERIMENTAL RESULTS

3.1 The Influence of the deformation force, P

Table 1 shows the results of out tests. Each value represents the average of five measurements (Pruteanu et all, 2006).

We infer from the table that the prameters' minimal values have been obtained for the deformation force P= 6.5 Mpa. Fig. 2 shows the graphical representation of the variation of the bed bearers'roughness and ovality varying with the deformation force (Pruteanu et all, 2007).

3.2 The influence of the deformation feed, A

Table 2 shows the results of our tests. The parameter values represent the average of five measurements.

[FIGURE 2 OMITTED]

We infer from the table that the minimal value for the shape deviation are obtained for A= 34 mm/min, while the minimal roughness will be obtained at an feed of 30 mm/min. Due to the fact that the roughness difference compared to that calculated for A= 34 mm/min is only of 0.01 um, we have chosen this value for the deformation feed.

Fig. 3 shows the graphical representation of the variation of the bed bearers'roughness and ovality varying with the deformation feed.

We infer from the table that the minimal values for shape deviations will be obtained for the speed V= 95 rpm, while the minimal roughness of 0.41 um will be obtained for V= 80 rpm.

Due to the fact that the difference compared to that for V= 95 rpm is of only 0.03um and that the value 0.44 um is bellow the value stipulated in the technical documentation for a normal functioning of bearings, we have recommended for processing the value V= 95 rpm.

Fig. 4 shows the graphical representation of the bed bearers' roughness and ovality, varying with the tool's speed of rotation.

3.3 The influence of the tool's rotation speed, V Table 3 shows the results of our tests. The parameters values represent the average of five measurements.

[FIGURE 3 OMITTED]

[FIGURE 4 OMITTED]

4. CONCLUSION

From the parameters' variation range on the testing machine, we have determined the values for which we can obtain the best technical conditions for the ball-bearing races'bed bearers:

* The deformation force value P= 6,5 MPa ensures for all parameter values- roughness and ovality--the best values;

* The deformation feed value A= 34 mm/min ensures minimal values for shape deviation--ovality--as well as values acceptable within the framework of technical conditions imposed for the normal functioning of bearings to ensure the roughness of the bed bearers.

* The tool's rotation speed value V = 95 rpm ensures minimal values for the shape deviation and acceptable values for the bed bearers' roughness.

We will extend ours research to other bearings. Likewise, we will analyze the influence of the work parameters upon the circularity.

5. REFERENCES

Lupescu, O., Carausu, C., Lupescu Ov. (2004). Structural modification of the OLl 37 steel to superficial plastic distorsion processing at cold through rolling, Bul. Inst. Pol. Iasi, Tomul L (LIV), Fasc V a, 213-216.

Pruteanu ,O.V., Carausu, C. Paraschiv, Dr., Sarbu, I., (2006). The influence of the working parameters on the parameters of the superficial layer when procesing the steels through grinding in the rolling's technology. [TEXT NOT REPRODUCIBLE IN ASCII] Minsk, Belarus, may, 186-197.

Pruteanu, O.V., Paraschiv, Dr., Pricope, C., Bunea, C.M., Sarbu, I., Carausu, C. (2007). Considerations Regarding the 100Cr6 Material's Conduct through the cold Rolling of the Bearing Rings, International Journal for Manufacturing Science & Technology, U.S. Library of Congress, vol. 9, no.1, p.51-57, ISSN 1524-1548.

Pruteanu, O.V., Paraschiv, Dr., Carausu, C., Sarbu, I., Bunea, M., Bardac, D. (2007). Processing through plastic deformation of the bearing rings. MicroCAD 2007, International Scientific Conference, Miskolc, 143-148.

Wagoner, R.H., Chenot, J.L. (2001). Metal forming analysis. Cambridge University Press. New York.
Table 1. The Influence of the deformation
force, PA = 34 mm/ min, S = 95 rot/ min

 P Ra Ovality
[MPa] [[mu]m] [mm]

 5.5 0.39 0.30
 6.0 0.44 0.27
 6.5 0.41 0.15
 7.0 0.43 0.22

Table 2. The influence of the deformation
feed P = 6.5 Mpa, S = 95 rpm

 A [R.sub.a] Ovality
[mm/min] [[mu]m] [mm]

 27.5 0.46 0.27
 30 0.41 0.20
 32 0.45 0.24
 34 0.42 0.18

Table 3. The influence of the tool's rotation
speed P = 6,5 Mpa, A = 34 mm/ min

 V Ra Ovality
[rpm] [[mu]m] [mm]

 80 0,41 0,27
 85 0,44 0,25
 90 0,42 0,24
 95 0,44 0,18
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