Каталог Sumitomo резьбонарезной инструмент - страница 5

SEC-Threading Tools Basics of Threads ■ Parts of the Thread Thread angle Thread Thread root Helix Effective diameter (d) Effective diameter (d) Root diameter Root diameter External Internal Lead angle (I) Lead angle (R) Length of one revolution Pitch (P) Effective diameter (d) External thread Internal thread Lead angle diameter （d）: Thread groove width that has a virtually comparable cylinder diameter to the thread width Effective ● How to calculate a lead angle R : Lead angle Pitch （P）: Adjoining thread distance I : Lead Lead （ I ）: Thread movement amount after one revolution tan R = I = n×P n : Number of threads X×d X×d P : Pitch (1 section threads are comparable with the pitch) d : Effective thread diameter Lead angle（α）: A corner that forms a right angled flat surface between the thread helix and thread axis ■ Basic Profile of Major Thread Forms Application Symbol Basic profile Application Symbol Basic profile Application Symbol Basic profile Application Symbol Basic profile Parallel threads for pipe Internal thread F Taper pipe thread Internal thread Internal thread Internal thread R0.137P Internal thread Internal thread Rc(PT) UN Unified thread Metric thread 1/4P R0.137P 1/4P 60° G(PF) 55° 27.5° 27.5° 60° (BSPT) UNC Threading M Rp(PS) Tools External thread UNF h h h External thread R0.137P R(PT) R0.137P 1/8P G(PF) External thread 90° 1°47′ External thread UNEF 1/8P External thread (BSPT) External thread Grooving Taper US pipe thread Taper US pipe thread Thread for aerospace Internal thread Internal thread Internal thread Internal thread Witworth thread R0.137P 5/16P 30° 30° 30° 30° instruments Cut-Off W 55° 60° h h BSW UNJ NPT NPTF h Threading h BSP R0.137P 1°47′ 1°47′ R 90° 90° External thread External thread External thread External thread ■ Holder and Insert Selection Guide (SSTE Type/SSTI Type) External diameter (Spindle forward rotation) Internal diameter (Spindle forward rotation) External diameter (Spindle reverse rotation) External holder Internal holder External holder (SSTE type) (SSTI type) (SSTE type) Right threading Inserts for external machining Inserts for internal machining Inserts for external machining (16ER type) (16IR type) (16ER type) Shim Shim Shim ( YE3-1P/YE3/YE3-1N YE3-3P/YE3-2P ) ( YI3-1P/YI3/YI3-1N YI3-3P/YI3-2P ) ( YE3-1P/YE3/YE3-1N YE3-3P/YE3-2P ) External holder Internal holder External holder (SSTE type) (SSTI type) (SSTE type) Left threading Inserts for external machining Inserts for internal machining Inserts for external machining (16ER type) (16IR type) (16ER type) Shim Shim Shim ( YE3-2N/YE3-3N ) ( YI3-2N/YI3-3N ) ( YE3-2N/YE3-3N ) ■ Threading Method and Angle of Insert Right threading Left threading Shim angle Insert ≒ Lead angle Insert Shim angle （E） ≒ Negative lead angle Shim （E） Shim Standard tilting angle of holder Standard tilting angle of holder （1.5° ） （1.5° ） F67