Общий каталог ZCC-CT 2019 - страница 460

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TurningMillingDrillingTechnicalInformationIndex Technical information – turning Technical information Parting & groovingAdjusting the cutting edge height A – Mount the tool holder in a 90° angle to the central axis of the workpiece. This improves the surface quality and decreases the risk of vibrations. – Height tolerance between the cutting edge of the insert and the centre of the work piece should be kept ± 0.1 mm, especially for parting of rods and grooving of materials with a small diameter. This extends the tool life and reduces the cutting forces as well as the formation of burrs. B Parting off – When the cutting edge nears the central axis of the work piece, reducing the feed rate by 30 % can extend the tool life of the insert. – Pick a tool holder with the smallest possible overhang to avoid vibrations and tool deflection. Longitudinal turning and profile turning – Machining sequence 0.5 mm: 1. Bring radial feed rate to required cutting depth (ap max. 0.75 × cutting edge width) 2. Radial relocating by 0.1 mm3. Longitudinal turning to opposite shoulder C 4. Diagonal relocating by 0.5 mm outward axial feed rate to the starting point 5. Radial feed rate to required cutting depth, etc. – When machining the chamfer or the base of the slot follow the steps as shown in figure. This reduces tool deflection and avoids cutting edge chipping. Surface grooving and turning D – Roughing: Processing from largest diameter to the axis. When returning it's recommended to bend the tool slightly. – Flute turning: Depth of axial turning less than 0.75 × S (width of insert). When the pocket width is bigger than the depth follow the working steps as shown. When the pocket depth is bigger than the width, we recommend to go to the required diameter step by step. – Finishing: When finishing begin with the outer diameter and the bottom. Then go on with the inner diameter to the required size. E Internal machining – Procedure according to figure. For better chip removal in blind holes machine from the inside out. A 455