Page 690 - Yamawa_European_Catalogue_YEU21
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15. Surface Treatment

    Intro


            The best surface treatment is applied to each tap depending on the tapping purpose.
            Characteristics and eff ectiveness of surface treatment are introduced at next section.
    SP
            Oxidizing
            •   This treatment was processed by using HOMO furnace being made by LEED AND NORTHUP company USA in 1938, and it is called HOMO
               treatment. This treatment is also called vapor treatment and steam treatment. Through this treatment, Fe 3 O 4  layer of blue black color is
    SL         produced over the tool surface.
            •   Oxidization treatment produces porous layer on tool’s surface. This porous layer works as oil pocket to reduce friction, to avoid welding
               and to improve the surface roughness of internal screw. Moreover, longer tool life is expected because the treatment reduces the
               remaining stress of HSS tools.
    PO      •   This treatment does not increase the hardness on tool surface. Using the furnace of YAMAWA original design and choosing the proper
               treatment time, we have marked good result of oxidizing for YAMAWA HSS tools.
            •   Stainless steel and low carbon steel are the materials that are easy to get welding. We are applying this treatment to the special purpose
               taps for these materials to get good result. Further due to the reduction of friction force, this treatment has good result for wide range of
               steel type material.
    ST
            •   We combine oxidizing with nitriding for the taps designed for thermal refined steels of high carbon steels and alloy steels. This double
               treatment wins good reputation of the market.

    ROLL

            Thickness of oxide layer and the time of treatment  Comparison between bright and oxide treated


    CARBIDE    (μm)
                                                                                     CUTTING CONDITION
                                                                                     Tap: SP-VA/M8×1.25/ISO2(6H)
                                                                                     Material: AISI304 (165-171HB)
    LONG                                                                             Hole size: Ø 6.8 mm
                                                                                     Tapping Length: 12 mm (through hole)
                                                                                     Tapping Speed: 7.2 m/min
                                                                                     Cutting oil: Insoluble oil
              Thickness of oxide layer                        Number of tapped holes
    HAND                                                                             Tapping Machine: CNC tapping machine

    TAPS


    EG (STI)



    SPECIAL
    THREADS,
    GAUGES


    THREAD
    MILLS                                              minute      SP-VA design  SP-VA
                                                                      (Bright)  (Oxide treated)
                                Treatment time

    DIES




    CENTER
    DRILLS



    Technical
    info




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