Общий каталог Yamawa 2022 - 2023 - страница 1224

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Technical Description of productsInformation ーズ 22. Features of MC-Helical Thread Mills ■Comparison of internal threads cut by helical cutter and by PT tap ■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 speci cation 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0.0さ0 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 は内径で0（下穴）基準5と0 工具基準が10考0 えられま1す50。MC - ヘリ2カ00ルカッタ 250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300Vc （m/min） 除く）ので、下穴径はタップと同じにします。 Technical-73