Общий каталог Tungaloy 2020 - 2021 - страница 1637

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Selection o f ST- t y p e Toolholders B

Selection of internal threading toolholders

Relation between internal toolholders and machinable threads C

In the tables starting from next page, the relationships between toolholders,

inserts, threads to be machined, and shims to be replaced are shown. In these Symbols

tables, the criteria are set as follows.

  • The minimum machining diameter. Recommended
  • The L/D ratio of the toolholder. D
  • The lead angle of the thread. Usable
  • Cutting conditions

Especially when machining near the minimum machining diameter, the x Needs replacing of the shim. compensation for the lead angle should be done carefully. "2" indicates "Change to the shim Moreover, in threading, because chips generally can not be broken into small for 2° lead angle".

pieces, the shank size should be selected in consideration of adequate ■ Unusable E

clearance (C ). 1

Internal diameter

of threadStock to be removed with full-profile insert.F
C ≥ 3 mmInternal thread
1
( 1 mm for 6IR insert holders)
External
RthreadG
L/D ≤ 2¬
Minor dia. of int Minor dia. of ext
Internal thread L/D ≤ 3 C2
¬ H
L
How to use the tablesI
qFirstly, fi nd the nominal thread diameter. Example: M35 X 1.5
wThe table indicates that the lead angle is 0°48ߙ.
eThe Cat. No. of the insert to be used corresponds with IR15ISO.
rBy following the row to the right,and marks are found. The mark indicates the optimum toolholder type. The J
toolholders of mark are usable, but less rigid because the shank diameter against the threading diameter is smaller than
those of marked toolholder. In this example, CNR0025R16 and TCNR0020R16DT are the optimum toolholders. The
insert Cat.No. is 16IR15ISO.
tIn the case of M33 X 3 thread, the lead angle is 1°46ߙ. By following the row to the right. x mark is found. This indicates that
the shim should be replaced to 2° type. For calculation of the lead angle, refer to page B405.K
Metric fi ne screw thread (ISO)
(For full size of this table, see page L051.)

Shank material Steel shank Carbide shank “Tsuppari-Ichiban”

Insert size 6IR 11IR 16IR 22IR 6IR 11IR 16IR 16IR 22IR L

Holder Cat. No.

Insert Cat. No.

M33⫻1.5 1.5 32.030º51´IR15ISO
M33⫻2231.71º09´IR20ISOM
M33⫻33 31.051º46´IR30ISO™™
M35⫻1.5 1.5 34.030º48´IR15ISO
M36⫻1.5 1.5 35.030º47´IR15ISO
M36⫻2234.71º03´IR20ISO
M36⫻33 34.051º36´IR30ISO™™
M38⫻1.5 1.5 37.030º44´IR15ISO
M39⫻1.5 1.5 38.030º43´IR15ISO