Общий каталог Yamawa 2022 - 2023 - страница 1224

ーズ 22. Features of MC-Helical Thread Mills ■Comparison of internal threads cut by helical cutter and by PT tap Description of products ■Pipe thread cutting by tap When PT tap cuts internal threads, the tap cuts the threads with all cutting edges and the tap reverses from the position where each cutting edge on lands sticks into the material wall of internal threads. This results in the stop line due to a step caused by this sticking. ■Pipe thread cutting by helical cutter Due to the thread cutting of 3 axis movement without reversing, the internal thread has no stop line. ■Selection of tool diameter against the size of the internal threads When cutting internal threads with MC-HLC, please choose the tool which diameter is smaller than 70% of internal threads diameter. The cutter having larger outside diameter is preferable due to its high rigidity. Thread milling cutters do not have screw lead. Please select thread milling cutters by referring to product specification table to avoid poor threads caused by interference. ■Cutting conditions ○For MC-CSLC ― Stainless steel ― fz （mm/t） 0.15 0.10 Possible cutting range Recommended 0.05 cutting range 0.00 0 50 100 150 200 250 300 Vc （m/min） ― Structural steel ― fz （mm/t） 0.15 min-1 0.10 Possible cutting range Recommended 0.05 cutting range MC - ヘリカルカッタを使用する場合の切り込み量は、一般的にねじ山 の高さの分を1回で加工するように機械を設定しますが、設定の基準 0.00 0（下穴）基準と工具基準が考えられます。MC は内径で 50 100 150 200 - ヘリカルカッタ 250 300 Vc （m/min） は、工具の谷部では切削しないようになっています （管用のRc、Rp は 除く） ので、下穴径はタップと同じにします。 Information Technical Technical-73