Каталог Iscar токарный инструмент 2017 - страница 350

Finishing Operation: Diameter Compensation

A compensation factor for the final diameter must be used in the final machining operation.

longitudinal turning. At this point the deflection occurs. A Δ/2

If machining continues without correction, corner A will penetrate the material. This will result in two different diameters: øD1 from the grooving and øD2 from the turning.

The difference between øD1 and øD2 is a value we define as ∆. The compensation factor is ∆/2, as shown below. ap

∆ øD1-øD2

= 1

2 2

Using the compensation factor will eliminate the small surface /2 Δ step. Follow this simple procedure during machining: 1. Groove to the final diameter 2. Pull the tool back, a distance equal to the value of ∆/2

3. Continue the finish turning operation 2

Characteristic values of ∆ are shown in the diagrams on the next page.

3

Characteristic Values of ∆

The diagrams show experimental results for Insert: GIP 3.00E-0.4 specific machining conditions. These are sample Toolholder: GHDR 25-3 values that will vary with different workpiece 0.24 materials and different holder types. 0.20 ap=3 mm ap=2 mm 0.16 0.12 ap=1 mm 0.08 Measure the ∆ value for your finishing operation in a short test using your selected finishing conditions. ap=0.5 mm 0.04 Do not run your test using the final diameter. 0

0.1 0.2 0.3 0.4 0.5 0.6

Feed f (mm/rev) Insert: GIP 4.00E-0.4 Insert: GIP 6.00E-0.8 Toolholder: GHDR 25-4 Toolholder: GHDR 25-5 0.24 0.24

ap=4 mm 0.20 0.20 ap=3 mm ap=4 mm 0.16 0.16 0.12 0.12 ap=2 mm ap=3 mm 0.08 0.08 ap=2 mm 0.04 0.04 ap=1 mm ap=1 mm 0 0

0.1 0.2 0.3 0.4 0.5 0.6 0.1 0.2 0.3 0.4 0.5 0.6

Feed f (mm/rev) Feed f (mm/rev)