Каталог Sumitomo резьбонарезной инструмент - страница 5

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