Serial No.

Process Name

Key Requirements & Control Points

1

Material Preparation

Bar stock / Tube stock; Partial work pieces require forging + annealing / normalizing to eliminate stress

2

Turning

Rough turning for forming with grinding allowance reserved

3

Heat Treatment

Quenching + low-temperature tempering to ensure hardness HRC60–64

4

Rough Grinding

Rough grinding of outer diameter, inner diameter and end faces

5

Finish Grinding

Finish grinding to dimensional tolerance and guarantee geometric accuracy

6

Superfinishing / Fine Lapping

Improve surface roughness

7

Final Inspection

Dimension, roundness, parallelism and roughness

8

Rust Prevention & Warehousing

Rust-proof treatment, waiting for matching and assembly

Serial No.

Process Name

Key Requirements & Control Points

1

Forming

Cold heading of bar stock / wire rod into ball blanks

2

Soft Grinding / Ball Polishing

Chipping, rough grinding and soft grinding to improve spherical accuracy

3

Heat Treatment

Quenching + low-temperature tempering with hardness HRC60–64

4

Hard Grinding / Rough Grinding

Remove oxide layer and stabilize dimension

5

Finish Grinding

Improve dimensional accuracy and roundness

6

Fine Lapping / Super Lapping

Achieve final surface quality

7

Final Inspection & Sorting

Sort by diameter accuracy grade

8

Rust Prevention, Packaging & Warehousing

Rust prevention and packaging, waiting for assembly

Serial No.

Process Name

Key Requirements & Control Points

1

Forming

Turning of bar stock / cold heading of wire rod

2

Banding & Soft Grinding

Unique process for rollers to guarantee reference datum

3

Heat Treatment

Quenching + low-temperature tempering

4

Barrel Polishing / Soft Grinding for Deburring

Correct heat treatment deformation

5

Rough Grinding of Outer Diameter

Remove machining allowance

6

Rough Grinding of End Faces

Secure length reference datum

7

Fine Grinding of Outer Diameter

Improve cylindricity

8

Finish Grinding of End Faces

Meet length tolerance

9

Finish Grinding of Outer Diameter

Reach final dimension

10

Final Inspection & Sorting

Sort by outer diameter and length

11

Rust Prevention, Packaging & Warehousing

Rust prevention and packaging, waiting for assembly

Serial No.

Process Name

Key Requirements & Control Points

1

Sheet Shearing

Cutting blank according to specified size

2

Blanking

Punch out basic outline of cage

3

Stamping Forming

Form pockets and structural profile

4

Shaping, Deburring & Precision Machining

Correct dimension and flatness

5

Pickling / Shot Blasting / Barrel Polishing

Remove burrs and oxide scale

6

Final Inspection

Pocket position, dimension and burr status

7

Rust Prevention, Packaging & Warehousing

Rust prevention and packaging, waiting for assembly

Serial No.

Process Name

Key Control Points

1

Material Preparation

Bar stock / Tube stock / Forgings / Castings

2

Turning

Turning inner diameter, outer diameter, end faces and chamfers

3

Drilling / Broaching / Boring

Machine pockets and guarantee position tolerance

4

Pickling

Remove burrs and clean workpiece surface

5

Final Inspection

Dimension, position tolerance and burr status

6

Rust Prevention, Packaging & Warehousing

Rust prevention and packaging, waiting for assembly