Valve Block

    Initial situation

    The spool bore of a hydraulic valve block is known for its high precision requirements. The common machining method is using a single bladed reaming tool followed by a honing process.
    In this case the focus is on reducing the machining time while maintaining the tight tolerances.

    Material: Ductile iron (GJS-400)

    Metric    Imperial
    Bore-Ø: 37.970 +0.012 mm 1.4949 +0.0005 in
    Length: 180 mm                           7.0866 in


    Requirements

    Metric               Imperial
    Surface: Ra 1.6 µm Ra 63 µin
    Concentricity: 0.006 mm 0.00025 in
    Straightness: 0.006 mm 0.00025 in
    Cylindricity: 0.008 mm 0.00031 in

    The URMA solution

    Special reaming tool with guide pads

    Highest feed rates thanks to multi-edged RX reaming tool

    The quick change system allows an insert change within seconds. There is no need to remove the tool from the machine and perform additional adjustments.

    Hydraulic valve blocks with larger tolerances can be finished without an extra honing operation.

    More about special tools

    Cutting data URMA machining

    Metric         Imperial
    Cutting speed: Vc 150 m/min SFM: 492 ft/min
    Feed per tooth: fz 0.10 mm ipt: 0.004 in
    Number of teeth: 8
    Feed: fv 1006 mm/min ipm: 39.6 in/min
    Radial stock removal: ap 0.15 mm D.O.C.: 0.006 in

    Highlights

    Less stock removal for honing process
    Cycle time reduced by 8 times
    Highly reduced adjustment efforts

    Do you have any questions?

    Gianluca Bara - Director Sales Tools