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BURNISHING | S.C.A.M.I.® Roller Burnishing Systems

Roller Burnishing Overview When to Roller Burnish

A

DRILLING

Conditions for Roller Burnishing Roller burnishing is a cold-working process used to achieve fine hole finishes. In order to achieve the most optimal results, adhere to the benchmarks below: • Finishing: The ductility and hardness of the workpiece material along with the surface preparation dictates the quality of the burnished finish. • Workability: Any ductile and malleable material up to RC40 can be roller burnished. • Worked Surface Properties: Workpieces with an interrupted surface within 10% of the circumference can be successfully burnished with a standard tool (see Figures 1 and 2).

10%

20%

B

BORING

Figure 1

Figure 2

• Tolerance of the Burnished Piece: The tolerance range achieved from the burnishing will be equal to that achieved from the premachining since no material will be removed. The ideal surface for burnishing consists of a succession of peaks. These peaks correspond on regular feed of the preparation tool (see Figure 3). We suggest the ALVAN® expandable reamer for preburnishing because it creates a uniform roughness and a tolerance range of H6 - H7.

C

REAMING

Figure 3

D

Premachining tapers and surface irregularities caused by cutting tool failure must be noted because these conditions cannot be corrected by the roller burnishing process (see Figures 4 and 5).

BURNISHING

Chipped cutting edge

E

Figure 4

THREADING

Tapered preparation

Figure 5

X

SPECIALS

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D: 3