Mitsubishi Heavy Industries Technical Review
    Vol. 52 No. 3 (2015)   Machine Tools
    Technical Papers

    "M-CM5BG" Large Engine Part-Compatible Horizontal Machining Cell for Mass Production Processing Lines

    Yohei Komatsu,
    Keisuke Yoshikawa,
    Hiroyuki Wakamoto,
    Kazuto Nakamura,
    Hidefumi Omokawa

    The present machine tool market has no machining centers capable of completely processing the parts of a 13,000 cc displacement-class engine (1,000 mm in total length), the largest size offered by domestic truck/bus manufacturers. It is, therefore, necessary to build a dedicated line equipped with special purpose machines, and existing processing lines were poor in terms of benefit-cost ratio and are inflexible. Crank-hole drilling on a cylinder block as a key engine part requires the long tool called a line borer. To meet this requirement, Mitsubishi Heavy Industries, Ltd. (MHI) developed the M-CM5BG horizontal machining cell with equipment that automatically replaces long tools of a maximum of 1,350 mm (and stores four tools at one time). Along with a high-rigidity bed for which the Z-axis stroke of 1,700 mm needed for long tool machining has been realized by supporting it at three points, the technologies mounted on this machine for maintainability, automation and labor saving are featured in this paper.