Why is Inner Race Milling Machine Better?

Precise Manufacturing of CV Joints – Focus on: Outer Races

The production of outer races is demanding on both the machine and the machining technology. Excellent quality for the ball tracks, tight tolerances in turning operations, and high volumes are required. To meet these demands, EMAG offers optimized manufacturing systems for the production of CV joint workpieces such as outer races, inner races and cages. These manufacturing processes are customized to each individual customer’s workpieces, which guarantees high productivity and availability.  

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Outer Race Machining

The machines of the VSC series are designed for the highly productive manufacturing of outer races. By combining the turning and milling machining operations, the outer races are completely machined  in one clamping operation. The twin-spindle design ensures outstanding productivity.

Solutions for Outer Race Variants: 

• Outer race processing – Fixed joint
• Outer race processing – Sliding joint

Technologies:

• Internal soft turning of outer races
• Soft milling of ball tracks
• Internal hard turning of outer races
• Hard milling of ball tracks

Other Technologies Available from the EMAG Group

• Induction hardening of outer races on EMAG eldec induction hardening machines including the VLC 100 IH series

Hardening of Outer Races – Fast, Controlled, Ideal for Line Integration

Based on the characteristics of high heat resistance and inertia of CBN material, CBN wheel in bearing processing, its thermal stability and thermal conductivity is good, can work normally in the high temperature of ~℃, suitable for high strength alloy steel and high speed steel grinding process with high thermal sensitivity, and can keep the material smooth, will not leave grinding cracks. 
Vitrified CBN grinding wheel is based on CBN grinding wheel technology through technical improvement, its stability, heat resistance and acid and alkali resistance is strong, in the process of working, its coefficient of thermal expansion is small, not easy to clog, so it can keep the surface of the material smooth. 

Grinding steps:

1. Forging bearing outer ring blank. 
2. Rolling preforming
3. Outside diameter, end face, inside diameter and raceway;
4. After carbonitriding quenching and tempering, quenching temperature 850 ~ 870°C, quenching 250 ~ 300°C tempering.
5. With a profile grinding machine grinding bearing outer ring a end face
6. Bearing outer ring outer circle and raceway grinding. 

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7. The other end of the bearing outer ring rough grinding

8. Bearing outer ring outer circle and raceway polishing fine grinding nine, the other end of the bearing outer ring polishing fine grinding.

When roughing outer raceway roughing outer raceway, the grinding amount left for fine grinding should be appropriate, and the precision of ellipse, edge roundness, raceway position, raceway side swing and groove shape of roughing raceway should be ensured to meet the technological requirements, which can not be ignored.  If the precision of coarse grinding raceway is poor, in order to make the precision of fine grinding raceway meet the technological requirements, it is bound to increase the rough grinding allowance artificially.  Large retention, fine grinding feed, cutting amount will increase, in the long run, will affect the precision of the machine tool, resulting in fine grinding precision decline.  The test results show that the allowance for fine grinding is about 0.10-0.15mm when the precision of oval, edge roundness, raceway position, raceway side swing and groove shape of rough-grinding outer raceway of medium deep groove ball bearing meets the technological requirements.  In addition, burns are not allowed when roughing outer raceway.  

---EDITOR: Doris Hu

---POST: Doris Hu

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