Page 25 - ISCAR_WORLD_2021
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There are two types of threading inserts:
        full profile and partial profile.
        Full profile inserts produce specific thread types, i.e.,
        round (Rd) in accordance with DIN 405, British Standard
        Whitworth (BSW). Partial profile inserts require a
        precise pre-turning operation.

        ISCAR’s laydown family of inserts offers a wide range
        of thread type standards for both internal and external
        applications.  Laydown inserts can be divided into 3
        main types:
        G-type – General duty inserts with deflector for
        machining various engineering materials, including the
        production of short chips.
        M-type – Press-to-size inserts with sintered-shaped
        chipbreaker for efficient chip control. Although these
        inserts are press-to-size, they ensure the same thread
        accuracy as the
        G-type insert. When threading at too small depths of cut,
        the chipbreaker efficiency drops and the M-type inserts
        are less recommended.
        B-type – Peripherally ground inserts with a pressed
        chipbreaker. Efficient chip control with a sharp cutting
        edge is the ultimate combination for long chip materials
        and the first choice for ISO M stainless steel. When
        machining small parts, it is beneficial to use sharp-edged
        inserts with a chipbreaker to reduce cutting forces and
        consequently prevent vibrations.


        Before using the multi tooth insert, it’s important to
 Typically, the thread designation is in accordance with   ensure the thread area is not next to the shoulder, or that
 metric or imperial systems depending on the thread   there’s a wide release groove to complete a full thread
 type standard.  In most cases, the thread designation   along the part.
 includes the following parameters:
        In addition to the ISO Standard laydown insert, ISCAR
        has a diverse group of captive pocket inserts.  Captive
 • Standard classification  pocket inserts are divided into internal threading and
 • Thread pitch  external threading types according to their application.
 • Number of starts  Contrary to the ISO Standard laydown insert family, the
 • Nominal diameter  clearance angles are already ground.
 • Thread length
 • Tolerance class


 The moment we have the values of the thread   Aside from setting the correct lead (helix) angle, the
 diameter, thread pitch, and the number of starts, we   anvil also supports the insert’s cutting edge and
 can calculate the thread lead (Helix) angle φ. This value   protects the tool in case of insert breakage.
 will be very important for the next steps of the anvil
 selection if a possible solution relates to lay-down
 inserts. For such a tool, the found lead (Helix) angle
 determines the choice of anvils.






 TELLIGENTLY
 24  MACHINING  IN  DUSTRY 4.0                                                                           ISCAR    25
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