Обший каталог Yamawa 2016 - 2017 - страница 846

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24. The mechanism for a tap to cut oversize on an internal thread Description of products 1. Run out, misalignment and tap cutting in non perpendicular to holes Over-cutting at radial direction Tool run out during tapping Misalignment during tapping Tapping a non-parallel or non-perpendicular thread to the axis of the hole. Holder needs to be Axis of tapping process Verification of holder adjusted. Tapping with holder and bored hole should holder holder prepared hole run out can be observed be lined up correctly. condition. and checked when idle The use of adjustable running. holder with floating Lateral force features will reduce this problem. Solutions misalignment Run out Excessive cutting in radial direction causes oversized internal threads. Since tapping proceeds along bored hole, in the depth of hole, oversize cutting is minimized, that is, oversize cutting in the beginning of the hole and normal cutting in the depth of the hole. Excessive-cutting in the radial direction Normal internal threads Not Go gauge Over sized Normal Not Go internal threads Not Go gauge internal gauge internal threads at the beginning threads of the bore 2. Using a tap not suitable for the operation or a tap with dull Over-cutting caused by galling and excess cutting cutting edge may cause galling and result in over-cutting. Using an incorrect tap for a specific workpiece material Tapping process with dull edge can cause problems Wear Welding Chipping Select the correct Tap Flank Straight fluted tap Spiral fluted tap Spiral pointed tap Roll tap Wear Parallel Welding Chipping wear Selection of correct taps suitable for material being tapped is strongly recommended. Solution: Proper use of cutting oil, confirmation of a constant for tool life Torn threads occur on the thread flanks. If this Incomplete situation gets worse, there occur large thread thread collapses or incomplete threads finally bringing out Over-cutting caused by oversized internal threads. galling and excess feeding Incomplete Depending on the condition of collapsed threads thread such trouble tends to occur discontinuously as Information NOT-GO gouge enters. Technical Special attention needs to be taken so that random inspection should not miss this kind of trouble. Incomplete thread Not Go gauge Technical-71 842